/************************************************* * Exim - an Internet mail transport agent * *************************************************/ /* Copyright (c) University of Cambridge 1995 - 2018 */ /* Copyright (c) The Exim Maintainers 2020 */ /* See the file NOTICE for conditions of use and distribution. */ /* Functions for handling string expansion. */ #include "exim.h" /* Recursively called function */ static uschar *expand_string_internal(const uschar *, BOOL, const uschar **, BOOL, BOOL, BOOL *); static int_eximarith_t expanded_string_integer(const uschar *, BOOL); #ifdef STAND_ALONE # ifndef SUPPORT_CRYPTEQ # define SUPPORT_CRYPTEQ # endif #endif #ifdef LOOKUP_LDAP # include "lookups/ldap.h" #endif #ifdef SUPPORT_CRYPTEQ # ifdef CRYPT_H # include # endif # ifndef HAVE_CRYPT16 extern char* crypt16(char*, char*); # endif #endif /* The handling of crypt16() is a mess. I will record below the analysis of the mess that was sent to me. We decided, however, to make changing this very low priority, because in practice people are moving away from the crypt() algorithms nowadays, so it doesn't seem worth it. There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts the first 8 characters of the password using a 20-round version of crypt (standard crypt does 25 rounds). It then crypts the next 8 characters, or an empty block if the password is less than 9 characters, using a 20-round version of crypt and the same salt as was used for the first block. Characters after the first 16 are ignored. It always generates a 16-byte hash, which is expressed together with the salt as a string of 24 base 64 digits. Here are some links to peruse: http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2 http://seclists.org/bugtraq/1999/Mar/0076.html There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix, and OSF/1. This is the same as the standard crypt if given a password of 8 characters or less. If given more, it first does the same as crypt using the first 8 characters, then crypts the next 8 (the 9th to 16th) using as salt the first two base 64 digits from the first hash block. If the password is more than 16 characters then it crypts the 17th to 24th characters using as salt the first two base 64 digits from the second hash block. And so on: I've seen references to it cutting off the password at 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links: http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2 http://seclists.org/bugtraq/1999/Mar/0109.html http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D- TET1_html/sec.c222.html#no_id_208 Exim has something it calls "crypt16". It will either use a native crypt16 or its own implementation. A native crypt16 will presumably be the one that I called "crypt16" above. The internal "crypt16" function, however, is a two-block-maximum implementation of what I called "bigcrypt". The documentation matches the internal code. I suspect that whoever did the "crypt16" stuff for Exim didn't realise that crypt16 and bigcrypt were different things. Exim uses the LDAP-style scheme identifier "{crypt16}" to refer to whatever it is using under that name. This unfortunately sets a precedent for using "{crypt16}" to identify two incompatible algorithms whose output can't be distinguished. With "{crypt16}" thus rendered ambiguous, I suggest you deprecate it and invent two new identifiers for the two algorithms. Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts of the password separately means they can be cracked separately, so the double-length hash only doubles the cracking effort instead of squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based bcrypt ({CRYPT}$2a$). */ /************************************************* * Local statics and tables * *************************************************/ /* Table of item names, and corresponding switch numbers. The names must be in alphabetical order. */ static uschar *item_table[] = { US"acl", US"authresults", US"certextract", US"dlfunc", US"env", US"extract", US"filter", US"hash", US"hmac", US"if", #ifdef SUPPORT_I18N US"imapfolder", #endif US"length", US"listextract", US"listquote", US"lookup", US"map", US"nhash", US"perl", US"prvs", US"prvscheck", US"readfile", US"readsocket", US"reduce", US"run", US"sg", US"sort", #ifdef SUPPORT_SRS US"srs_encode", #endif US"substr", US"tr" }; enum { EITEM_ACL, EITEM_AUTHRESULTS, EITEM_CERTEXTRACT, EITEM_DLFUNC, EITEM_ENV, EITEM_EXTRACT, EITEM_FILTER, EITEM_HASH, EITEM_HMAC, EITEM_IF, #ifdef SUPPORT_I18N EITEM_IMAPFOLDER, #endif EITEM_LENGTH, EITEM_LISTEXTRACT, EITEM_LISTQUOTE, EITEM_LOOKUP, EITEM_MAP, EITEM_NHASH, EITEM_PERL, EITEM_PRVS, EITEM_PRVSCHECK, EITEM_READFILE, EITEM_READSOCK, EITEM_REDUCE, EITEM_RUN, EITEM_SG, EITEM_SORT, #ifdef SUPPORT_SRS EITEM_SRS_ENCODE, #endif EITEM_SUBSTR, EITEM_TR }; /* Tables of operator names, and corresponding switch numbers. The names must be in alphabetical order. There are two tables, because underscore is used in some cases to introduce arguments, whereas for other it is part of the name. This is an historical mis-design. */ static uschar *op_table_underscore[] = { US"from_utf8", US"local_part", US"quote_local_part", US"reverse_ip", US"time_eval", US"time_interval" #ifdef SUPPORT_I18N ,US"utf8_domain_from_alabel", US"utf8_domain_to_alabel", US"utf8_localpart_from_alabel", US"utf8_localpart_to_alabel" #endif }; enum { EOP_FROM_UTF8, EOP_LOCAL_PART, EOP_QUOTE_LOCAL_PART, EOP_REVERSE_IP, EOP_TIME_EVAL, EOP_TIME_INTERVAL #ifdef SUPPORT_I18N ,EOP_UTF8_DOMAIN_FROM_ALABEL, EOP_UTF8_DOMAIN_TO_ALABEL, EOP_UTF8_LOCALPART_FROM_ALABEL, EOP_UTF8_LOCALPART_TO_ALABEL #endif }; static uschar *op_table_main[] = { US"address", US"addresses", US"base32", US"base32d", US"base62", US"base62d", US"base64", US"base64d", US"bless", US"domain", US"escape", US"escape8bit", US"eval", US"eval10", US"expand", US"h", US"hash", US"hex2b64", US"hexquote", US"ipv6denorm", US"ipv6norm", US"l", US"lc", US"length", US"listcount", US"listnamed", US"mask", US"md5", US"nh", US"nhash", US"quote", US"randint", US"rfc2047", US"rfc2047d", US"rxquote", US"s", US"sha1", US"sha2", US"sha256", US"sha3", US"stat", US"str2b64", US"strlen", US"substr", US"uc", US"utf8clean" }; enum { EOP_ADDRESS = nelem(op_table_underscore), EOP_ADDRESSES, EOP_BASE32, EOP_BASE32D, EOP_BASE62, EOP_BASE62D, EOP_BASE64, EOP_BASE64D, EOP_BLESS, EOP_DOMAIN, EOP_ESCAPE, EOP_ESCAPE8BIT, EOP_EVAL, EOP_EVAL10, EOP_EXPAND, EOP_H, EOP_HASH, EOP_HEX2B64, EOP_HEXQUOTE, EOP_IPV6DENORM, EOP_IPV6NORM, EOP_L, EOP_LC, EOP_LENGTH, EOP_LISTCOUNT, EOP_LISTNAMED, EOP_MASK, EOP_MD5, EOP_NH, EOP_NHASH, EOP_QUOTE, EOP_RANDINT, EOP_RFC2047, EOP_RFC2047D, EOP_RXQUOTE, EOP_S, EOP_SHA1, EOP_SHA2, EOP_SHA256, EOP_SHA3, EOP_STAT, EOP_STR2B64, EOP_STRLEN, EOP_SUBSTR, EOP_UC, EOP_UTF8CLEAN }; /* Table of condition names, and corresponding switch numbers. The names must be in alphabetical order. */ static uschar *cond_table[] = { US"<", US"<=", US"=", US"==", /* Backward compatibility */ US">", US">=", US"acl", US"and", US"bool", US"bool_lax", US"crypteq", US"def", US"eq", US"eqi", US"exists", US"first_delivery", US"forall", US"forall_json", US"forall_jsons", US"forany", US"forany_json", US"forany_jsons", US"ge", US"gei", US"gt", US"gti", #ifdef SUPPORT_SRS US"inbound_srs", #endif US"inlist", US"inlisti", US"isip", US"isip4", US"isip6", US"ldapauth", US"le", US"lei", US"lt", US"lti", US"match", US"match_address", US"match_domain", US"match_ip", US"match_local_part", US"or", US"pam", US"pwcheck", US"queue_running", US"radius", US"saslauthd" }; enum { ECOND_NUM_L, ECOND_NUM_LE, ECOND_NUM_E, ECOND_NUM_EE, ECOND_NUM_G, ECOND_NUM_GE, ECOND_ACL, ECOND_AND, ECOND_BOOL, ECOND_BOOL_LAX, ECOND_CRYPTEQ, ECOND_DEF, ECOND_STR_EQ, ECOND_STR_EQI, ECOND_EXISTS, ECOND_FIRST_DELIVERY, ECOND_FORALL, ECOND_FORALL_JSON, ECOND_FORALL_JSONS, ECOND_FORANY, ECOND_FORANY_JSON, ECOND_FORANY_JSONS, ECOND_STR_GE, ECOND_STR_GEI, ECOND_STR_GT, ECOND_STR_GTI, #ifdef SUPPORT_SRS ECOND_INBOUND_SRS, #endif ECOND_INLIST, ECOND_INLISTI, ECOND_ISIP, ECOND_ISIP4, ECOND_ISIP6, ECOND_LDAPAUTH, ECOND_STR_LE, ECOND_STR_LEI, ECOND_STR_LT, ECOND_STR_LTI, ECOND_MATCH, ECOND_MATCH_ADDRESS, ECOND_MATCH_DOMAIN, ECOND_MATCH_IP, ECOND_MATCH_LOCAL_PART, ECOND_OR, ECOND_PAM, ECOND_PWCHECK, ECOND_QUEUE_RUNNING, ECOND_RADIUS, ECOND_SASLAUTHD }; /* Types of table entry */ enum vtypes { vtype_int, /* value is address of int */ vtype_filter_int, /* ditto, but recognized only when filtering */ vtype_ino, /* value is address of ino_t (not always an int) */ vtype_uid, /* value is address of uid_t (not always an int) */ vtype_gid, /* value is address of gid_t (not always an int) */ vtype_bool, /* value is address of bool */ vtype_stringptr, /* value is address of pointer to string */ vtype_msgbody, /* as stringptr, but read when first required */ vtype_msgbody_end, /* ditto, the end of the message */ vtype_msgheaders, /* the message's headers, processed */ vtype_msgheaders_raw, /* the message's headers, unprocessed */ vtype_localpart, /* extract local part from string */ vtype_domain, /* extract domain from string */ vtype_string_func, /* value is string returned by given function */ vtype_todbsdin, /* value not used; generate BSD inbox tod */ vtype_tode, /* value not used; generate tod in epoch format */ vtype_todel, /* value not used; generate tod in epoch/usec format */ vtype_todf, /* value not used; generate full tod */ vtype_todl, /* value not used; generate log tod */ vtype_todlf, /* value not used; generate log file datestamp tod */ vtype_todzone, /* value not used; generate time zone only */ vtype_todzulu, /* value not used; generate zulu tod */ vtype_reply, /* value not used; get reply from headers */ vtype_pid, /* value not used; result is pid */ vtype_host_lookup, /* value not used; get host name */ vtype_load_avg, /* value not used; result is int from os_getloadavg */ vtype_pspace, /* partition space; value is T/F for spool/log */ vtype_pinodes, /* partition inodes; value is T/F for spool/log */ vtype_cert /* SSL certificate */ #ifndef DISABLE_DKIM ,vtype_dkim /* Lookup of value in DKIM signature */ #endif }; /* Type for main variable table */ typedef struct { const char *name; enum vtypes type; void *value; } var_entry; /* Type for entries pointing to address/length pairs. Not currently in use. */ typedef struct { uschar **address; int *length; } alblock; static uschar * fn_recipients(void); typedef uschar * stringptr_fn_t(void); static uschar * fn_queue_size(void); /* This table must be kept in alphabetical order. */ static var_entry var_table[] = { /* WARNING: Do not invent variables whose names start acl_c or acl_m because they will be confused with user-creatable ACL variables. */ { "acl_arg1", vtype_stringptr, &acl_arg[0] }, { "acl_arg2", vtype_stringptr, &acl_arg[1] }, { "acl_arg3", vtype_stringptr, &acl_arg[2] }, { "acl_arg4", vtype_stringptr, &acl_arg[3] }, { "acl_arg5", vtype_stringptr, &acl_arg[4] }, { "acl_arg6", vtype_stringptr, &acl_arg[5] }, { "acl_arg7", vtype_stringptr, &acl_arg[6] }, { "acl_arg8", vtype_stringptr, &acl_arg[7] }, { "acl_arg9", vtype_stringptr, &acl_arg[8] }, { "acl_narg", vtype_int, &acl_narg }, { "acl_verify_message", vtype_stringptr, &acl_verify_message }, { "address_data", vtype_stringptr, &deliver_address_data }, { "address_file", vtype_stringptr, &address_file }, { "address_pipe", vtype_stringptr, &address_pipe }, #ifdef EXPERIMENTAL_ARC { "arc_domains", vtype_string_func, (void *) &fn_arc_domains }, { "arc_oldest_pass", vtype_int, &arc_oldest_pass }, { "arc_state", vtype_stringptr, &arc_state }, { "arc_state_reason", vtype_stringptr, &arc_state_reason }, #endif { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id }, { "authenticated_id", vtype_stringptr, &authenticated_id }, { "authenticated_sender",vtype_stringptr, &authenticated_sender }, { "authentication_failed",vtype_int, &authentication_failed }, #ifdef WITH_CONTENT_SCAN { "av_failed", vtype_int, &av_failed }, #endif #ifdef EXPERIMENTAL_BRIGHTMAIL { "bmi_alt_location", vtype_stringptr, &bmi_alt_location }, { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict }, { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict }, { "bmi_deliver", vtype_int, &bmi_deliver }, #endif { "body_linecount", vtype_int, &body_linecount }, { "body_zerocount", vtype_int, &body_zerocount }, { "bounce_recipient", vtype_stringptr, &bounce_recipient }, { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit }, { "caller_gid", vtype_gid, &real_gid }, { "caller_uid", vtype_uid, &real_uid }, { "callout_address", vtype_stringptr, &callout_address }, { "compile_date", vtype_stringptr, &version_date }, { "compile_number", vtype_stringptr, &version_cnumber }, { "config_dir", vtype_stringptr, &config_main_directory }, { "config_file", vtype_stringptr, &config_main_filename }, { "csa_status", vtype_stringptr, &csa_status }, #ifdef EXPERIMENTAL_DCC { "dcc_header", vtype_stringptr, &dcc_header }, { "dcc_result", vtype_stringptr, &dcc_result }, #endif #ifndef DISABLE_DKIM { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO }, { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH }, { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY }, { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS }, { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS }, { "dkim_created", vtype_dkim, (void *)DKIM_CREATED }, { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer }, { "dkim_domain", vtype_stringptr, &dkim_signing_domain }, { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES }, { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES }, { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY }, { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY }, { "dkim_key_length", vtype_int, &dkim_key_length }, { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS }, { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES }, { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE }, { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING }, { "dkim_selector", vtype_stringptr, &dkim_signing_selector }, { "dkim_signers", vtype_stringptr, &dkim_signers }, { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason }, { "dkim_verify_status", vtype_stringptr, &dkim_verify_status }, #endif #ifdef SUPPORT_DMARC { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy }, { "dmarc_status", vtype_stringptr, &dmarc_status }, { "dmarc_status_text", vtype_stringptr, &dmarc_status_text }, { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain }, #endif { "dnslist_domain", vtype_stringptr, &dnslist_domain }, { "dnslist_matched", vtype_stringptr, &dnslist_matched }, { "dnslist_text", vtype_stringptr, &dnslist_text }, { "dnslist_value", vtype_stringptr, &dnslist_value }, { "domain", vtype_stringptr, &deliver_domain }, { "domain_data", vtype_stringptr, &deliver_domain_data }, #ifndef DISABLE_EVENT { "event_data", vtype_stringptr, &event_data }, /*XXX want to use generic vars for as many of these as possible*/ { "event_defer_errno", vtype_int, &event_defer_errno }, { "event_name", vtype_stringptr, &event_name }, #endif { "exim_gid", vtype_gid, &exim_gid }, { "exim_path", vtype_stringptr, &exim_path }, { "exim_uid", vtype_uid, &exim_uid }, { "exim_version", vtype_stringptr, &version_string }, { "headers_added", vtype_string_func, (void *) &fn_hdrs_added }, { "home", vtype_stringptr, &deliver_home }, { "host", vtype_stringptr, &deliver_host }, { "host_address", vtype_stringptr, &deliver_host_address }, { "host_data", vtype_stringptr, &host_data }, { "host_lookup_deferred",vtype_int, &host_lookup_deferred }, { "host_lookup_failed", vtype_int, &host_lookup_failed }, { "host_port", vtype_int, &deliver_host_port }, { "initial_cwd", vtype_stringptr, &initial_cwd }, { "inode", vtype_ino, &deliver_inode }, { "interface_address", vtype_stringptr, &interface_address }, { "interface_port", vtype_int, &interface_port }, { "item", vtype_stringptr, &iterate_item }, #ifdef LOOKUP_LDAP { "ldap_dn", vtype_stringptr, &eldap_dn }, #endif { "load_average", vtype_load_avg, NULL }, { "local_part", vtype_stringptr, &deliver_localpart }, { "local_part_data", vtype_stringptr, &deliver_localpart_data }, { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix }, { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v }, { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix }, { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v }, #ifdef HAVE_LOCAL_SCAN { "local_scan_data", vtype_stringptr, &local_scan_data }, #endif { "local_user_gid", vtype_gid, &local_user_gid }, { "local_user_uid", vtype_uid, &local_user_uid }, { "localhost_number", vtype_int, &host_number }, { "log_inodes", vtype_pinodes, (void *)FALSE }, { "log_space", vtype_pspace, (void *)FALSE }, { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated}, { "mailstore_basename", vtype_stringptr, &mailstore_basename }, #ifdef WITH_CONTENT_SCAN { "malware_name", vtype_stringptr, &malware_name }, #endif { "max_received_linelength", vtype_int, &max_received_linelength }, { "message_age", vtype_int, &message_age }, { "message_body", vtype_msgbody, &message_body }, { "message_body_end", vtype_msgbody_end, &message_body_end }, { "message_body_size", vtype_int, &message_body_size }, { "message_exim_id", vtype_stringptr, &message_id }, { "message_headers", vtype_msgheaders, NULL }, { "message_headers_raw", vtype_msgheaders_raw, NULL }, { "message_id", vtype_stringptr, &message_id }, { "message_linecount", vtype_int, &message_linecount }, { "message_size", vtype_int, &message_size }, #ifdef SUPPORT_I18N { "message_smtputf8", vtype_bool, &message_smtputf8 }, #endif #ifdef WITH_CONTENT_SCAN { "mime_anomaly_level", vtype_int, &mime_anomaly_level }, { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text }, { "mime_boundary", vtype_stringptr, &mime_boundary }, { "mime_charset", vtype_stringptr, &mime_charset }, { "mime_content_description", vtype_stringptr, &mime_content_description }, { "mime_content_disposition", vtype_stringptr, &mime_content_disposition }, { "mime_content_id", vtype_stringptr, &mime_content_id }, { "mime_content_size", vtype_int, &mime_content_size }, { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding }, { "mime_content_type", vtype_stringptr, &mime_content_type }, { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename }, { "mime_filename", vtype_stringptr, &mime_filename }, { "mime_is_coverletter", vtype_int, &mime_is_coverletter }, { "mime_is_multipart", vtype_int, &mime_is_multipart }, { "mime_is_rfc822", vtype_int, &mime_is_rfc822 }, { "mime_part_count", vtype_int, &mime_part_count }, #endif { "n0", vtype_filter_int, &filter_n[0] }, { "n1", vtype_filter_int, &filter_n[1] }, { "n2", vtype_filter_int, &filter_n[2] }, { "n3", vtype_filter_int, &filter_n[3] }, { "n4", vtype_filter_int, &filter_n[4] }, { "n5", vtype_filter_int, &filter_n[5] }, { "n6", vtype_filter_int, &filter_n[6] }, { "n7", vtype_filter_int, &filter_n[7] }, { "n8", vtype_filter_int, &filter_n[8] }, { "n9", vtype_filter_int, &filter_n[9] }, { "original_domain", vtype_stringptr, &deliver_domain_orig }, { "original_local_part", vtype_stringptr, &deliver_localpart_orig }, { "originator_gid", vtype_gid, &originator_gid }, { "originator_uid", vtype_uid, &originator_uid }, { "parent_domain", vtype_stringptr, &deliver_domain_parent }, { "parent_local_part", vtype_stringptr, &deliver_localpart_parent }, { "pid", vtype_pid, NULL }, #ifndef DISABLE_PRDR { "prdr_requested", vtype_bool, &prdr_requested }, #endif { "primary_hostname", vtype_stringptr, &primary_hostname }, #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS) { "proxy_external_address",vtype_stringptr, &proxy_external_address }, { "proxy_external_port", vtype_int, &proxy_external_port }, { "proxy_local_address", vtype_stringptr, &proxy_local_address }, { "proxy_local_port", vtype_int, &proxy_local_port }, { "proxy_session", vtype_bool, &proxy_session }, #endif { "prvscheck_address", vtype_stringptr, &prvscheck_address }, { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum }, { "prvscheck_result", vtype_stringptr, &prvscheck_result }, { "qualify_domain", vtype_stringptr, &qualify_domain_sender }, { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient }, { "queue_name", vtype_stringptr, &queue_name }, { "queue_size", vtype_string_func, &fn_queue_size }, { "rcpt_count", vtype_int, &rcpt_count }, { "rcpt_defer_count", vtype_int, &rcpt_defer_count }, { "rcpt_fail_count", vtype_int, &rcpt_fail_count }, { "received_count", vtype_int, &received_count }, { "received_for", vtype_stringptr, &received_for }, { "received_ip_address", vtype_stringptr, &interface_address }, { "received_port", vtype_int, &interface_port }, { "received_protocol", vtype_stringptr, &received_protocol }, { "received_time", vtype_int, &received_time.tv_sec }, { "recipient_data", vtype_stringptr, &recipient_data }, { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure }, { "recipients", vtype_string_func, (void *) &fn_recipients }, { "recipients_count", vtype_int, &recipients_count }, #ifdef WITH_CONTENT_SCAN { "regex_match_string", vtype_stringptr, ®ex_match_string }, #endif { "reply_address", vtype_reply, NULL }, { "return_path", vtype_stringptr, &return_path }, { "return_size_limit", vtype_int, &bounce_return_size_limit }, { "router_name", vtype_stringptr, &router_name }, { "runrc", vtype_int, &runrc }, { "self_hostname", vtype_stringptr, &self_hostname }, { "sender_address", vtype_stringptr, &sender_address }, { "sender_address_data", vtype_stringptr, &sender_address_data }, { "sender_address_domain", vtype_domain, &sender_address }, { "sender_address_local_part", vtype_localpart, &sender_address }, { "sender_data", vtype_stringptr, &sender_data }, { "sender_fullhost", vtype_stringptr, &sender_fullhost }, { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec }, { "sender_helo_name", vtype_stringptr, &sender_helo_name }, { "sender_host_address", vtype_stringptr, &sender_host_address }, { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated }, { "sender_host_dnssec", vtype_bool, &sender_host_dnssec }, { "sender_host_name", vtype_host_lookup, NULL }, { "sender_host_port", vtype_int, &sender_host_port }, { "sender_ident", vtype_stringptr, &sender_ident }, { "sender_rate", vtype_stringptr, &sender_rate }, { "sender_rate_limit", vtype_stringptr, &sender_rate_limit }, { "sender_rate_period", vtype_stringptr, &sender_rate_period }, { "sender_rcvhost", vtype_stringptr, &sender_rcvhost }, { "sender_verify_failure",vtype_stringptr, &sender_verify_failure }, { "sending_ip_address", vtype_stringptr, &sending_ip_address }, { "sending_port", vtype_int, &sending_port }, { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname }, { "smtp_command", vtype_stringptr, &smtp_cmd_buffer }, { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument }, { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist }, { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count }, { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason }, { "sn0", vtype_filter_int, &filter_sn[0] }, { "sn1", vtype_filter_int, &filter_sn[1] }, { "sn2", vtype_filter_int, &filter_sn[2] }, { "sn3", vtype_filter_int, &filter_sn[3] }, { "sn4", vtype_filter_int, &filter_sn[4] }, { "sn5", vtype_filter_int, &filter_sn[5] }, { "sn6", vtype_filter_int, &filter_sn[6] }, { "sn7", vtype_filter_int, &filter_sn[7] }, { "sn8", vtype_filter_int, &filter_sn[8] }, { "sn9", vtype_filter_int, &filter_sn[9] }, #ifdef WITH_CONTENT_SCAN { "spam_action", vtype_stringptr, &spam_action }, { "spam_bar", vtype_stringptr, &spam_bar }, { "spam_report", vtype_stringptr, &spam_report }, { "spam_score", vtype_stringptr, &spam_score }, { "spam_score_int", vtype_stringptr, &spam_score_int }, #endif #ifdef SUPPORT_SPF { "spf_guess", vtype_stringptr, &spf_guess }, { "spf_header_comment", vtype_stringptr, &spf_header_comment }, { "spf_received", vtype_stringptr, &spf_received }, { "spf_result", vtype_stringptr, &spf_result }, { "spf_result_guessed", vtype_bool, &spf_result_guessed }, { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment }, #endif { "spool_directory", vtype_stringptr, &spool_directory }, { "spool_inodes", vtype_pinodes, (void *)TRUE }, { "spool_space", vtype_pspace, (void *)TRUE }, #ifdef EXPERIMENTAL_SRS_ALT { "srs_db_address", vtype_stringptr, &srs_db_address }, { "srs_db_key", vtype_stringptr, &srs_db_key }, { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient }, { "srs_orig_sender", vtype_stringptr, &srs_orig_sender }, #endif #if defined(EXPERIMENTAL_SRS_ALT) || defined(SUPPORT_SRS) { "srs_recipient", vtype_stringptr, &srs_recipient }, #endif #ifdef EXPERIMENTAL_SRS_ALT { "srs_status", vtype_stringptr, &srs_status }, #endif { "thisaddress", vtype_stringptr, &filter_thisaddress }, /* The non-(in,out) variables are now deprecated */ { "tls_bits", vtype_int, &tls_in.bits }, { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified }, { "tls_cipher", vtype_stringptr, &tls_in.cipher }, { "tls_in_bits", vtype_int, &tls_in.bits }, { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified }, { "tls_in_cipher", vtype_stringptr, &tls_in.cipher }, { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname }, { "tls_in_ocsp", vtype_int, &tls_in.ocsp }, { "tls_in_ourcert", vtype_cert, &tls_in.ourcert }, { "tls_in_peercert", vtype_cert, &tls_in.peercert }, { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn }, #ifndef DISABLE_TLS_RESUME { "tls_in_resumption", vtype_int, &tls_in.resumption }, #endif #ifndef DISABLE_TLS { "tls_in_sni", vtype_stringptr, &tls_in.sni }, #endif { "tls_in_ver", vtype_stringptr, &tls_in.ver }, { "tls_out_bits", vtype_int, &tls_out.bits }, { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified }, { "tls_out_cipher", vtype_stringptr, &tls_out.cipher }, { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname }, #ifdef SUPPORT_DANE { "tls_out_dane", vtype_bool, &tls_out.dane_verified }, #endif { "tls_out_ocsp", vtype_int, &tls_out.ocsp }, { "tls_out_ourcert", vtype_cert, &tls_out.ourcert }, { "tls_out_peercert", vtype_cert, &tls_out.peercert }, { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn }, #ifndef DISABLE_TLS_RESUME { "tls_out_resumption", vtype_int, &tls_out.resumption }, #endif #ifndef DISABLE_TLS { "tls_out_sni", vtype_stringptr, &tls_out.sni }, #endif #ifdef SUPPORT_DANE { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage }, #endif { "tls_out_ver", vtype_stringptr, &tls_out.ver }, { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */ #ifndef DISABLE_TLS { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */ #endif { "tod_bsdinbox", vtype_todbsdin, NULL }, { "tod_epoch", vtype_tode, NULL }, { "tod_epoch_l", vtype_todel, NULL }, { "tod_full", vtype_todf, NULL }, { "tod_log", vtype_todl, NULL }, { "tod_logfile", vtype_todlf, NULL }, { "tod_zone", vtype_todzone, NULL }, { "tod_zulu", vtype_todzulu, NULL }, { "transport_name", vtype_stringptr, &transport_name }, { "value", vtype_stringptr, &lookup_value }, { "verify_mode", vtype_stringptr, &verify_mode }, { "version_number", vtype_stringptr, &version_string }, { "warn_message_delay", vtype_stringptr, &warnmsg_delay }, { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients }, { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients }, { "warnmsg_delay", vtype_stringptr, &warnmsg_delay }, { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients }, { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients } }; static int var_table_size = nelem(var_table); static uschar var_buffer[256]; static BOOL malformed_header; /* For textual hashes */ static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "0123456789"; enum { HMAC_MD5, HMAC_SHA1 }; /* For numeric hashes */ static unsigned int prime[] = { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113}; /* For printing modes in symbolic form */ static uschar *mtable_normal[] = { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" }; static uschar *mtable_setid[] = { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" }; static uschar *mtable_sticky[] = { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" }; /* flags for find_header() */ #define FH_EXISTS_ONLY BIT(0) #define FH_WANT_RAW BIT(1) #define FH_WANT_LIST BIT(2) /************************************************* * Tables for UTF-8 support * *************************************************/ /* Table of the number of extra characters, indexed by the first character masked with 0x3f. The highest number for a valid UTF-8 character is in fact 0x3d. */ static uschar utf8_table1[] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 }; /* These are the masks for the data bits in the first byte of a character, indexed by the number of additional bytes. */ static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01}; /* Get the next UTF-8 character, advancing the pointer. */ #define GETUTF8INC(c, ptr) \ c = *ptr++; \ if ((c & 0xc0) == 0xc0) \ { \ int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \ int s = 6*a; \ c = (c & utf8_table2[a]) << s; \ while (a-- > 0) \ { \ s -= 6; \ c |= (*ptr++ & 0x3f) << s; \ } \ } static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567"; /************************************************* * Binary chop search on a table * *************************************************/ /* This is used for matching expansion items and operators. Arguments: name the name that is being sought table the table to search table_size the number of items in the table Returns: the offset in the table, or -1 */ static int chop_match(uschar *name, uschar **table, int table_size) { uschar **bot = table; uschar **top = table + table_size; while (top > bot) { uschar **mid = bot + (top - bot)/2; int c = Ustrcmp(name, *mid); if (c == 0) return mid - table; if (c > 0) bot = mid + 1; else top = mid; } return -1; } /************************************************* * Check a condition string * *************************************************/ /* This function is called to expand a string, and test the result for a "true" or "false" value. Failure of the expansion yields FALSE; logged unless it was a forced fail or lookup defer. We used to release all store used, but this is not not safe due to ${dlfunc } and ${acl }. In any case expand_string_internal() is reasonably careful to release what it can. The actual false-value tests should be replicated for ECOND_BOOL_LAX. Arguments: condition the condition string m1 text to be incorporated in panic error m2 ditto Returns: TRUE if condition is met, FALSE if not */ BOOL expand_check_condition(uschar *condition, uschar *m1, uschar *m2) { uschar * ss = expand_string(condition); if (!ss) { if (!f.expand_string_forcedfail && !f.search_find_defer) log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" " "for %s %s: %s", condition, m1, m2, expand_string_message); return FALSE; } return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 && strcmpic(ss, US"false") != 0; } /************************************************* * Pseudo-random number generation * *************************************************/ /* Pseudo-random number generation. The result is not "expected" to be cryptographically strong but not so weak that someone will shoot themselves in the foot using it as a nonce in some email header scheme or whatever weirdness they'll twist this into. The result should ideally handle fork(). However, if we're stuck unable to provide this, then we'll fall back to appallingly bad randomness. If DISABLE_TLS is not defined then this will not be used except as an emergency fallback. Arguments: max range maximum Returns a random number in range [0, max-1] */ #ifndef DISABLE_TLS # define vaguely_random_number vaguely_random_number_fallback #endif int vaguely_random_number(int max) { #ifndef DISABLE_TLS # undef vaguely_random_number #endif static pid_t pid = 0; pid_t p2; if ((p2 = getpid()) != pid) { if (pid != 0) { #ifdef HAVE_ARC4RANDOM /* cryptographically strong randomness, common on *BSD platforms, not so much elsewhere. Alas. */ # ifndef NOT_HAVE_ARC4RANDOM_STIR arc4random_stir(); # endif #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV) # ifdef HAVE_SRANDOMDEV /* uses random(4) for seeding */ srandomdev(); # else { struct timeval tv; gettimeofday(&tv, NULL); srandom(tv.tv_sec | tv.tv_usec | getpid()); } # endif #else /* Poor randomness and no seeding here */ #endif } pid = p2; } #ifdef HAVE_ARC4RANDOM return arc4random() % max; #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV) return random() % max; #else /* This one returns a 16-bit number, definitely not crypto-strong */ return random_number(max); #endif } /************************************************* * Pick out a name from a string * *************************************************/ /* If the name is too long, it is silently truncated. Arguments: name points to a buffer into which to put the name max is the length of the buffer s points to the first alphabetic character of the name extras chars other than alphanumerics to permit Returns: pointer to the first character after the name Note: The test for *s != 0 in the while loop is necessary because Ustrchr() yields non-NULL if the character is zero (which is not something I expected). */ static const uschar * read_name(uschar *name, int max, const uschar *s, uschar *extras) { int ptr = 0; while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL)) { if (ptr < max-1) name[ptr++] = *s; s++; } name[ptr] = 0; return s; } /************************************************* * Pick out the rest of a header name * *************************************************/ /* A variable name starting $header_ (or just $h_ for those who like abbreviations) might not be the complete header name because headers can contain any printing characters in their names, except ':'. This function is called to read the rest of the name, chop h[eader]_ off the front, and put ':' on the end, if the name was terminated by white space. Arguments: name points to a buffer in which the name read so far exists max is the length of the buffer s points to the first character after the name so far, i.e. the first non-alphameric character after $header_xxxxx Returns: a pointer to the first character after the header name */ static const uschar * read_header_name(uschar *name, int max, const uschar *s) { int prelen = Ustrchr(name, '_') - name + 1; int ptr = Ustrlen(name) - prelen; if (ptr > 0) memmove(name, name+prelen, ptr); while (mac_isgraph(*s) && *s != ':') { if (ptr < max-1) name[ptr++] = *s; s++; } if (*s == ':') s++; name[ptr++] = ':'; name[ptr] = 0; return s; } /************************************************* * Pick out a number from a string * *************************************************/ /* Arguments: n points to an integer into which to put the number s points to the first digit of the number Returns: a pointer to the character after the last digit */ /*XXX consider expanding to int_eximarith_t. But the test for "overbig numbers" in 0002 still needs to overflow it. */ static uschar * read_number(int *n, uschar *s) { *n = 0; while (isdigit(*s)) *n = *n * 10 + (*s++ - '0'); return s; } static const uschar * read_cnumber(int *n, const uschar *s) { *n = 0; while (isdigit(*s)) *n = *n * 10 + (*s++ - '0'); return s; } /************************************************* * Extract keyed subfield from a string * *************************************************/ /* The yield is in dynamic store; NULL means that the key was not found. Arguments: key points to the name of the key s points to the string from which to extract the subfield Returns: NULL if the subfield was not found, or a pointer to the subfield's data */ uschar * expand_getkeyed(const uschar * key, const uschar * s) { int length = Ustrlen(key); Uskip_whitespace(&s); /* Loop to search for the key */ while (*s) { int dkeylength; uschar * data; const uschar * dkey = s; while (*s && *s != '=' && !isspace(*s)) s++; dkeylength = s - dkey; if (Uskip_whitespace(&s) == '=') while (isspace(*++s)); data = string_dequote(&s); if (length == dkeylength && strncmpic(key, dkey, length) == 0) return data; Uskip_whitespace(&s); } return NULL; } static var_entry * find_var_ent(uschar * name) { int first = 0; int last = var_table_size; while (last > first) { int middle = (first + last)/2; int c = Ustrcmp(name, var_table[middle].name); if (c > 0) { first = middle + 1; continue; } if (c < 0) { last = middle; continue; } return &var_table[middle]; } return NULL; } /************************************************* * Extract numbered subfield from string * *************************************************/ /* Extracts a numbered field from a string that is divided by tokens - for example a line from /etc/passwd is divided by colon characters. First field is numbered one. Negative arguments count from the right. Zero returns the whole string. Returns NULL if there are insufficient tokens in the string ***WARNING*** Modifies final argument - this is a dynamically generated string, so that's OK. Arguments: field number of field to be extracted, first field = 1, whole string = 0, last field = -1 separators characters that are used to break string into tokens s points to the string from which to extract the subfield Returns: NULL if the field was not found, a pointer to the field's data inside s (modified to add 0) */ static uschar * expand_gettokened (int field, uschar *separators, uschar *s) { int sep = 1; int count; uschar *ss = s; uschar *fieldtext = NULL; if (field == 0) return s; /* Break the line up into fields in place; for field > 0 we stop when we have done the number of fields we want. For field < 0 we continue till the end of the string, counting the number of fields. */ count = (field > 0)? field : INT_MAX; while (count-- > 0) { size_t len; /* Previous field was the last one in the string. For a positive field number, this means there are not enough fields. For a negative field number, check that there are enough, and scan back to find the one that is wanted. */ if (sep == 0) { if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL; if ((-field) == (INT_MAX - count - 1)) return s; while (field++ < 0) { ss--; while (ss[-1] != 0) ss--; } fieldtext = ss; break; } /* Previous field was not last in the string; save its start and put a zero at its end. */ fieldtext = ss; len = Ustrcspn(ss, separators); sep = ss[len]; ss[len] = 0; ss += len + 1; } return fieldtext; } static uschar * expand_getlistele(int field, const uschar * list) { const uschar * tlist = list; int sep = 0; /* Tainted mem for the throwaway element copies */ uschar * dummy = store_get(2, TRUE); if (field < 0) { for (field++; string_nextinlist(&tlist, &sep, dummy, 1); ) field++; sep = 0; } if (field == 0) return NULL; while (--field > 0 && (string_nextinlist(&list, &sep, dummy, 1))) ; return string_nextinlist(&list, &sep, NULL, 0); } /* Certificate fields, by name. Worry about by-OID later */ /* Names are chosen to not have common prefixes */ #ifndef DISABLE_TLS typedef struct { uschar * name; int namelen; uschar * (*getfn)(void * cert, uschar * mod); } certfield; static certfield certfields[] = { /* linear search; no special order */ { US"version", 7, &tls_cert_version }, { US"serial_number", 13, &tls_cert_serial_number }, { US"subject", 7, &tls_cert_subject }, { US"notbefore", 9, &tls_cert_not_before }, { US"notafter", 8, &tls_cert_not_after }, { US"issuer", 6, &tls_cert_issuer }, { US"signature", 9, &tls_cert_signature }, { US"sig_algorithm", 13, &tls_cert_signature_algorithm }, { US"subj_altname", 12, &tls_cert_subject_altname }, { US"ocsp_uri", 8, &tls_cert_ocsp_uri }, { US"crl_uri", 7, &tls_cert_crl_uri }, }; static uschar * expand_getcertele(uschar * field, uschar * certvar) { var_entry * vp; if (!(vp = find_var_ent(certvar))) { expand_string_message = string_sprintf("no variable named \"%s\"", certvar); return NULL; /* Unknown variable name */ } /* NB this stops us passing certs around in variable. Might want to do that in future */ if (vp->type != vtype_cert) { expand_string_message = string_sprintf("\"%s\" is not a certificate", certvar); return NULL; /* Unknown variable name */ } if (!*(void **)vp->value) return NULL; if (*field >= '0' && *field <= '9') return tls_cert_ext_by_oid(*(void **)vp->value, field, 0); for (certfield * cp = certfields; cp < certfields + nelem(certfields); cp++) if (Ustrncmp(cp->name, field, cp->namelen) == 0) { uschar * modifier = *(field += cp->namelen) == ',' ? ++field : NULL; return (*cp->getfn)( *(void **)vp->value, modifier ); } expand_string_message = string_sprintf("bad field selector \"%s\" for certextract", field); return NULL; } #endif /*DISABLE_TLS*/ /************************************************* * Extract a substring from a string * *************************************************/ /* Perform the ${substr or ${length expansion operations. Arguments: subject the input string value1 the offset from the start of the input string to the start of the output string; if negative, count from the right. value2 the length of the output string, or negative (-1) for unset if value1 is positive, unset means "all after" if value1 is negative, unset means "all before" len set to the length of the returned string Returns: pointer to the output string, or NULL if there is an error */ static uschar * extract_substr(uschar *subject, int value1, int value2, int *len) { int sublen = Ustrlen(subject); if (value1 < 0) /* count from right */ { value1 += sublen; /* If the position is before the start, skip to the start, and adjust the length. If the length ends up negative, the substring is null because nothing can precede. This falls out naturally when the length is unset, meaning "all to the left". */ if (value1 < 0) { value2 += value1; if (value2 < 0) value2 = 0; value1 = 0; } /* Otherwise an unset length => characters before value1 */ else if (value2 < 0) { value2 = value1; value1 = 0; } } /* For a non-negative offset, if the starting position is past the end of the string, the result will be the null string. Otherwise, an unset length means "rest"; just set it to the maximum - it will be cut down below if necessary. */ else { if (value1 > sublen) { value1 = sublen; value2 = 0; } else if (value2 < 0) value2 = sublen; } /* Cut the length down to the maximum possible for the offset value, and get the required characters. */ if (value1 + value2 > sublen) value2 = sublen - value1; *len = value2; return subject + value1; } /************************************************* * Old-style hash of a string * *************************************************/ /* Perform the ${hash expansion operation. Arguments: subject the input string (an expanded substring) value1 the length of the output string; if greater or equal to the length of the input string, the input string is returned value2 the number of hash characters to use, or 26 if negative len set to the length of the returned string Returns: pointer to the output string, or NULL if there is an error */ static uschar * compute_hash(uschar *subject, int value1, int value2, int *len) { int sublen = Ustrlen(subject); if (value2 < 0) value2 = 26; else if (value2 > Ustrlen(hashcodes)) { expand_string_message = string_sprintf("hash count \"%d\" too big", value2); return NULL; } /* Calculate the hash text. We know it is shorter than the original string, so can safely place it in subject[] (we know that subject is always itself an expanded substring). */ if (value1 < sublen) { int c; int i = 0; int j = value1; while ((c = (subject[j])) != 0) { int shift = (c + j++) & 7; subject[i] ^= (c << shift) | (c >> (8-shift)); if (++i >= value1) i = 0; } for (i = 0; i < value1; i++) subject[i] = hashcodes[(subject[i]) % value2]; } else value1 = sublen; *len = value1; return subject; } /************************************************* * Numeric hash of a string * *************************************************/ /* Perform the ${nhash expansion operation. The first characters of the string are treated as most important, and get the highest prime numbers. Arguments: subject the input string value1 the maximum value of the first part of the result value2 the maximum value of the second part of the result, or negative to produce only a one-part result len set to the length of the returned string Returns: pointer to the output string, or NULL if there is an error. */ static uschar * compute_nhash (uschar *subject, int value1, int value2, int *len) { uschar *s = subject; int i = 0; unsigned long int total = 0; /* no overflow */ while (*s != 0) { if (i == 0) i = nelem(prime) - 1; total += prime[i--] * (unsigned int)(*s++); } /* If value2 is unset, just compute one number */ if (value2 < 0) s = string_sprintf("%lu", total % value1); /* Otherwise do a div/mod hash */ else { total = total % (value1 * value2); s = string_sprintf("%lu/%lu", total/value2, total % value2); } *len = Ustrlen(s); return s; } /************************************************* * Find the value of a header or headers * *************************************************/ /* Multiple instances of the same header get concatenated, and this function can also return a concatenation of all the header lines. When concatenating specific headers that contain lists of addresses, a comma is inserted between them. Otherwise we use a straight concatenation. Because some messages can have pathologically large number of lines, there is a limit on the length that is returned. Arguments: name the name of the header, without the leading $header_ or $h_, or NULL if a concatenation of all headers is required newsize return the size of memory block that was obtained; may be NULL if exists_only is TRUE flags FH_EXISTS_ONLY set if called from a def: test; don't need to build a string; just return a string that is not "" and not "0" if the header exists FH_WANT_RAW set if called for $rh_ or $rheader_ items; no processing, other than concatenating, will be done on the header. Also used for $message_headers_raw. FH_WANT_LIST Double colon chars in the content, and replace newline with colon between each element when concatenating; returning a colon-sep list (elements might contain newlines) charset name of charset to translate MIME words to; used only if want_raw is false; if NULL, no translation is done (this is used for $bh_ and $bheader_) Returns: NULL if the header does not exist, else a pointer to a new store block */ static uschar * find_header(uschar *name, int *newsize, unsigned flags, uschar *charset) { BOOL found = !name; int len = name ? Ustrlen(name) : 0; BOOL comma = FALSE; gstring * g = NULL; for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old && h->text) /* NULL => Received: placeholder */ if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0)) { uschar * s, * t; size_t inc; if (flags & FH_EXISTS_ONLY) return US"1"; /* don't need actual string */ found = TRUE; s = h->text + len; /* text to insert */ if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */ Uskip_whitespace(&s); /* remove leading white space */ t = h->text + h->slen; /* end-point */ /* Unless wanted raw, remove trailing whitespace, including the newline. */ if (flags & FH_WANT_LIST) while (t > s && t[-1] == '\n') t--; else if (!(flags & FH_WANT_RAW)) { while (t > s && isspace(t[-1])) t--; /* Set comma if handling a single header and it's one of those that contains an address list, except when asked for raw headers. Only need to do this once. */ if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE; } /* Trim the header roughly if we're approaching limits */ inc = t - s; if (gstring_length(g) + inc > header_insert_maxlen) inc = header_insert_maxlen - gstring_length(g); /* For raw just copy the data; for a list, add the data as a colon-sep list-element; for comma-list add as an unchecked comma,newline sep list-elemment; for other nonraw add as an unchecked newline-sep list (we stripped trailing WS above including the newline). We ignore the potential expansion due to colon-doubling, just leaving the loop if the limit is met or exceeded. */ if (flags & FH_WANT_LIST) g = string_append_listele_n(g, ':', s, (unsigned)inc); else if (flags & FH_WANT_RAW) g = string_catn(g, s, (unsigned)inc); else if (inc > 0) g = string_append2_listele_n(g, comma ? US",\n" : US"\n", s, (unsigned)inc); if (gstring_length(g) >= header_insert_maxlen) break; } if (!found) return NULL; /* No header found */ if (!g) return US""; /* That's all we do for raw header expansion. */ *newsize = g->size; if (flags & FH_WANT_RAW) return string_from_gstring(g); /* Otherwise do RFC 2047 decoding, translating the charset if requested. The rfc2047_decode2() function can return an error with decoded data if the charset translation fails. If decoding fails, it returns NULL. */ else { uschar * error, * decoded = rfc2047_decode2(string_from_gstring(g), check_rfc2047_length, charset, '?', NULL, newsize, &error); if (error) DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n" " input was: %s\n", error, g->s); return decoded ? decoded : string_from_gstring(g); } } /* Append a "local" element to an Authentication-Results: header if this was a non-smtp message. */ static gstring * authres_local(gstring * g, const uschar * sysname) { if (!f.authentication_local) return g; g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")"); if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id); return g; } /* Append an "iprev" element to an Authentication-Results: header if we have attempted to get the calling host's name. */ static gstring * authres_iprev(gstring * g) { if (sender_host_name) g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")"); else if (host_lookup_deferred) g = string_cat(g, US";\n\tiprev=temperror"); else if (host_lookup_failed) g = string_cat(g, US";\n\tiprev=fail"); else return g; if (sender_host_address) g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address); return g; } /************************************************* * Return list of recipients * *************************************************/ /* A recipients list is available only during system message filtering, during ACL processing after DATA, and while expanding pipe commands generated from a system filter, but not elsewhere. */ static uschar * fn_recipients(void) { uschar * s; gstring * g = NULL; if (!f.enable_dollar_recipients) return NULL; for (int i = 0; i < recipients_count; i++) { s = recipients_list[i].address; g = string_append2_listele_n(g, US", ", s, Ustrlen(s)); } return g ? g->s : NULL; } /************************************************* * Return size of queue * *************************************************/ /* Ask the daemon for the queue size */ static uschar * fn_queue_size(void) { struct sockaddr_un sa_un = {.sun_family = AF_UNIX}; uschar buf[16]; int fd; ssize_t len; const uschar * where; #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS uschar * sname; #endif fd_set fds; struct timeval tv; if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) { DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno)); return NULL; } #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */ len = offsetof(struct sockaddr_un, sun_path) + 1 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "exim_%d", getpid()); #else sname = string_sprintf("%s/p_%d", spool_directory, getpid()); len = offsetof(struct sockaddr_un, sun_path) + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", sname); #endif if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0) { where = US"bind"; goto bad; } #ifdef notdef debug_printf("local addr '%s%s'\n", *sa_un.sun_path ? "" : "@", sa_un.sun_path + (*sa_un.sun_path ? 0 : 1)); #endif #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */ len = offsetof(struct sockaddr_un, sun_path) + 1 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "%s", expand_string(notifier_socket)); #else len = offsetof(struct sockaddr_un, sun_path) + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", expand_string(notifier_socket)); #endif if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0) { where = US"connect"; goto bad2; } buf[0] = NOTIFY_QUEUE_SIZE_REQ; if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; } FD_ZERO(&fds); FD_SET(fd, &fds); tv.tv_sec = 2; tv.tv_usec = 0; if (select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv) != 1) { DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n"); len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached()); } else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0) { where = US"recv"; goto bad2; } close(fd); #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS Uunlink(sname); #endif return string_copyn(buf, len); bad2: #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS Uunlink(sname); #endif bad: close(fd); DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno)); return NULL; } /************************************************* * Find value of a variable * *************************************************/ /* The table of variables is kept in alphabetic order, so we can search it using a binary chop. The "choplen" variable is nothing to do with the binary chop. Arguments: name the name of the variable being sought exists_only TRUE if this is a def: test; passed on to find_header() skipping TRUE => skip any processing evaluation; this is not the same as exists_only because def: may test for values that are first evaluated here newsize pointer to an int which is initially zero; if the answer is in a new memory buffer, *newsize is set to its size Returns: NULL if the variable does not exist, or a pointer to the variable's contents, or something non-NULL if exists_only is TRUE */ static uschar * find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize) { var_entry * vp; uschar *s, *domain; uschar **ss; void * val; /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx. Originally, xxx had to be a number in the range 0-9 (later 0-19), but from release 4.64 onwards arbitrary names are permitted, as long as the first 5 characters are acl_c or acl_m and the sixth is either a digit or an underscore (this gave backwards compatibility at the changeover). There may be built-in variables whose names start acl_ but they should never start in this way. This slightly messy specification is a consequence of the history, needless to say. If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is set, in which case give an error. */ if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) && !isalpha(name[5])) { tree_node * node = tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4); return node ? node->data.ptr : strict_acl_vars ? NULL : US""; } else if (Ustrncmp(name, "r_", 2) == 0) { tree_node * node = tree_search(router_var, name + 2); return node ? node->data.ptr : strict_acl_vars ? NULL : US""; } /* Handle $auth variables. */ if (Ustrncmp(name, "auth", 4) == 0) { uschar *endptr; int n = Ustrtoul(name + 4, &endptr, 10); if (*endptr == 0 && n != 0 && n <= AUTH_VARS) return !auth_vars[n-1] ? US"" : auth_vars[n-1]; } else if (Ustrncmp(name, "regex", 5) == 0) { uschar *endptr; int n = Ustrtoul(name + 5, &endptr, 10); if (*endptr == 0 && n != 0 && n <= REGEX_VARS) return !regex_vars[n-1] ? US"" : regex_vars[n-1]; } /* For all other variables, search the table */ if (!(vp = find_var_ent(name))) return NULL; /* Unknown variable name */ /* Found an existing variable. If in skipping state, the value isn't needed, and we want to avoid processing (such as looking up the host name). */ if (skipping) return US""; val = vp->value; switch (vp->type) { case vtype_filter_int: if (!f.filter_running) return NULL; /* Fall through */ /* VVVVVVVVVVVV */ case vtype_int: sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */ return var_buffer; case vtype_ino: sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */ return var_buffer; case vtype_gid: sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */ return var_buffer; case vtype_uid: sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */ return var_buffer; case vtype_bool: sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */ return var_buffer; case vtype_stringptr: /* Pointer to string */ return (s = *((uschar **)(val))) ? s : US""; case vtype_pid: sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */ return var_buffer; case vtype_load_avg: sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */ return var_buffer; case vtype_host_lookup: /* Lookup if not done so */ if ( !sender_host_name && sender_host_address && !host_lookup_failed && host_name_lookup() == OK) host_build_sender_fullhost(); return sender_host_name ? sender_host_name : US""; case vtype_localpart: /* Get local part from address */ if (!(s = *((uschar **)(val)))) return US""; if (!(domain = Ustrrchr(s, '@'))) return s; if (domain - s > sizeof(var_buffer) - 1) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT " in string expansion", sizeof(var_buffer)); return string_copyn(s, domain - s); case vtype_domain: /* Get domain from address */ if (!(s = *((uschar **)(val)))) return US""; domain = Ustrrchr(s, '@'); return domain ? domain + 1 : US""; case vtype_msgheaders: return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL); case vtype_msgheaders_raw: return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL); case vtype_msgbody: /* Pointer to msgbody string */ case vtype_msgbody_end: /* Ditto, the end of the msg */ ss = (uschar **)(val); if (!*ss && deliver_datafile >= 0) /* Read body when needed */ { uschar * body; off_t start_offset = SPOOL_DATA_START_OFFSET; int len = message_body_visible; if (len > message_size) len = message_size; *ss = body = store_get(len+1, TRUE); body[0] = 0; if (vp->type == vtype_msgbody_end) { struct stat statbuf; if (fstat(deliver_datafile, &statbuf) == 0) { start_offset = statbuf.st_size - len; if (start_offset < SPOOL_DATA_START_OFFSET) start_offset = SPOOL_DATA_START_OFFSET; } } if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s", strerror(errno)); if ((len = read(deliver_datafile, body, len)) > 0) { body[len] = 0; if (message_body_newlines) /* Separate loops for efficiency */ while (len > 0) { if (body[--len] == 0) body[len] = ' '; } else while (len > 0) { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; } } } return *ss ? *ss : US""; case vtype_todbsdin: /* BSD inbox time of day */ return tod_stamp(tod_bsdin); case vtype_tode: /* Unix epoch time of day */ return tod_stamp(tod_epoch); case vtype_todel: /* Unix epoch/usec time of day */ return tod_stamp(tod_epoch_l); case vtype_todf: /* Full time of day */ return tod_stamp(tod_full); case vtype_todl: /* Log format time of day */ return tod_stamp(tod_log_bare); /* (without timezone) */ case vtype_todzone: /* Time zone offset only */ return tod_stamp(tod_zone); case vtype_todzulu: /* Zulu time */ return tod_stamp(tod_zulu); case vtype_todlf: /* Log file datestamp tod */ return tod_stamp(tod_log_datestamp_daily); case vtype_reply: /* Get reply address */ s = find_header(US"reply-to:", newsize, exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, headers_charset); if (s) Uskip_whitespace(&s); if (!s || !*s) { *newsize = 0; /* For the *s==0 case */ s = find_header(US"from:", newsize, exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, headers_charset); } if (s) { uschar *t; Uskip_whitespace(&s); for (t = s; *t; t++) if (*t == '\n') *t = ' '; while (t > s && isspace(t[-1])) t--; *t = 0; } return s ? s : US""; case vtype_string_func: { stringptr_fn_t * fn = (stringptr_fn_t *) val; uschar* s = fn(); return s ? s : US""; } case vtype_pspace: { int inodes; sprintf(CS var_buffer, PR_EXIM_ARITH, receive_statvfs(val == (void *)TRUE, &inodes)); } return var_buffer; case vtype_pinodes: { int inodes; (void) receive_statvfs(val == (void *)TRUE, &inodes); sprintf(CS var_buffer, "%d", inodes); } return var_buffer; case vtype_cert: return *(void **)val ? US"" : US""; #ifndef DISABLE_DKIM case vtype_dkim: return dkim_exim_expand_query((int)(long)val); #endif } return NULL; /* Unknown variable. Silences static checkers. */ } void modify_variable(uschar *name, void * value) { var_entry * vp; if ((vp = find_var_ent(name))) vp->value = value; return; /* Unknown variable name, fail silently */ } /************************************************* * Read and expand substrings * *************************************************/ /* This function is called to read and expand argument substrings for various expansion items. Some have a minimum requirement that is less than the maximum; in these cases, the first non-present one is set to NULL. Arguments: sub points to vector of pointers to set n maximum number of substrings m minimum required sptr points to current string pointer skipping the skipping flag check_end if TRUE, check for final '}' name name of item, for error message resetok if not NULL, pointer to flag - write FALSE if unsafe to reset the store. Returns: 0 OK; string pointer updated 1 curly bracketing error (too few arguments) 2 too many arguments (only if check_end is set); message set 3 other error (expansion failure) */ static int read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping, BOOL check_end, uschar *name, BOOL *resetok) { const uschar *s = *sptr; Uskip_whitespace(&s); for (int i = 0; i < n; i++) { if (*s != '{') { if (i < m) { expand_string_message = string_sprintf("Not enough arguments for '%s' " "(min is %d)", name, m); return 1; } sub[i] = NULL; break; } if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok))) return 3; if (*s++ != '}') return 1; Uskip_whitespace(&s); } if (check_end && *s++ != '}') { if (s[-1] == '{') { expand_string_message = string_sprintf("Too many arguments for '%s' " "(max is %d)", name, n); return 2; } expand_string_message = string_sprintf("missing '}' after '%s'", name); return 1; } *sptr = s; return 0; } /************************************************* * Elaborate message for bad variable * *************************************************/ /* For the "unknown variable" message, take a look at the variable's name, and give additional information about possible ACL variables. The extra information is added on to expand_string_message. Argument: the name of the variable Returns: nothing */ static void check_variable_error_message(uschar *name) { if (Ustrncmp(name, "acl_", 4) == 0) expand_string_message = string_sprintf("%s (%s)", expand_string_message, (name[4] == 'c' || name[4] == 'm')? (isalpha(name[5])? US"6th character of a user-defined ACL variable must be a digit or underscore" : US"strict_acl_vars is set" /* Syntax is OK, it has to be this */ ) : US"user-defined ACL variables must start acl_c or acl_m"); } /* Load args from sub array to globals, and call acl_check(). Sub array will be corrupted on return. Returns: OK access is granted by an ACCEPT verb DISCARD access is (apparently) granted by a DISCARD verb FAIL access is denied FAIL_DROP access is denied; drop the connection DEFER can't tell at the moment ERROR disaster */ static int eval_acl(uschar ** sub, int nsub, uschar ** user_msgp) { int i; int sav_narg = acl_narg; int ret; uschar * dummy_logmsg; extern int acl_where; if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg); for (i = 0; i < nsub && sub[i+1]; i++) { uschar * tmp = acl_arg[i]; acl_arg[i] = sub[i+1]; /* place callers args in the globals */ sub[i+1] = tmp; /* stash the old args using our caller's storage */ } acl_narg = i; while (i < nsub) { sub[i+1] = acl_arg[i]; acl_arg[i++] = NULL; } DEBUG(D_expand) debug_printf_indent("expanding: acl: %s arg: %s%s\n", sub[0], acl_narg>0 ? acl_arg[0] : US"", acl_narg>1 ? " +more" : ""); ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg); for (i = 0; i < nsub; i++) acl_arg[i] = sub[i+1]; /* restore old args */ acl_narg = sav_narg; return ret; } /* Return pointer to dewrapped string, with enclosing specified chars removed. The given string is modified on return. Leading whitespace is skipped while looking for the opening wrap character, then the rest is scanned for the trailing (non-escaped) wrap character. A backslash in the string will act as an escape. A nul is written over the trailing wrap, and a pointer to the char after the leading wrap is returned. Arguments: s String for de-wrapping wrap Two-char string, the first being the opener, second the closer wrapping character Return: Pointer to de-wrapped string, or NULL on error (with expand_string_message set). */ static uschar * dewrap(uschar * s, const uschar * wrap) { uschar * p = s; unsigned depth = 0; BOOL quotesmode = wrap[0] == wrap[1]; if (Uskip_whitespace(&p) == *wrap) { s = ++p; wrap++; while (*p) { if (*p == '\\') p++; else if (!quotesmode && *p == wrap[-1]) depth++; else if (*p == *wrap) if (depth == 0) { *p = '\0'; return s; } else depth--; p++; } } expand_string_message = string_sprintf("missing '%c'", *wrap); return NULL; } /* Pull off the leading array or object element, returning a copy in an allocated string. Update the list pointer. The element may itself be an abject or array. Return NULL when the list is empty. */ static uschar * json_nextinlist(const uschar ** list) { unsigned array_depth = 0, object_depth = 0; const uschar * s = *list, * item; skip_whitespace(&s); for (item = s; *s && (*s != ',' || array_depth != 0 || object_depth != 0); s++) switch (*s) { case '[': array_depth++; break; case ']': array_depth--; break; case '{': object_depth++; break; case '}': object_depth--; break; } *list = *s ? s+1 : s; if (item == s) return NULL; item = string_copyn(item, s - item); DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item); return US item; } /************************************************/ /* Return offset in ops table, or -1 if not found. Repoint to just after the operator in the string. Argument: ss string representation of operator opname split-out operator name */ static int identify_operator(const uschar ** ss, uschar ** opname) { const uschar * s = *ss; uschar name[256]; /* Numeric comparisons are symbolic */ if (*s == '=' || *s == '>' || *s == '<') { int p = 0; name[p++] = *s++; if (*s == '=') { name[p++] = '='; s++; } name[p] = 0; } /* All other conditions are named */ else s = read_name(name, sizeof(name), s, US"_"); *ss = s; /* If we haven't read a name, it means some non-alpha character is first. */ if (!name[0]) { expand_string_message = string_sprintf("condition name expected, " "but found \"%.16s\"", s); return -1; } if (opname) *opname = string_copy(name); return chop_match(name, cond_table, nelem(cond_table)); } /************************************************* * Handle MD5 or SHA-1 computation for HMAC * *************************************************/ /* These are some wrapping functions that enable the HMAC code to be a bit cleaner. A good compiler will spot the tail recursion. Arguments: type HMAC_MD5 or HMAC_SHA1 remaining are as for the cryptographic hash functions Returns: nothing */ static void chash_start(int type, void * base) { if (type == HMAC_MD5) md5_start((md5 *)base); else sha1_start((hctx *)base); } static void chash_mid(int type, void * base, const uschar * string) { if (type == HMAC_MD5) md5_mid((md5 *)base, string); else sha1_mid((hctx *)base, string); } static void chash_end(int type, void * base, const uschar * string, int length, uschar * digest) { if (type == HMAC_MD5) md5_end((md5 *)base, string, length, digest); else sha1_end((hctx *)base, string, length, digest); } #ifdef SUPPORT_SRS /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer. Arguments: key encoding key, nul-terminated src data to be hashed, nul-terminated buf output buffer len size of output buffer */ static void hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len) { md5 md5_base; const uschar * keyptr; uschar * p; unsigned int keylen; #define MD5_HASHLEN 16 #define MD5_HASHBLOCKLEN 64 uschar keyhash[MD5_HASHLEN]; uschar innerhash[MD5_HASHLEN]; uschar finalhash[MD5_HASHLEN]; uschar innerkey[MD5_HASHBLOCKLEN]; uschar outerkey[MD5_HASHBLOCKLEN]; keyptr = key; keylen = Ustrlen(keyptr); /* If the key is longer than the hash block length, then hash the key first */ if (keylen > MD5_HASHBLOCKLEN) { chash_start(HMAC_MD5, &md5_base); chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash); keyptr = keyhash; keylen = MD5_HASHLEN; } /* Now make the inner and outer key values */ memset(innerkey, 0x36, MD5_HASHBLOCKLEN); memset(outerkey, 0x5c, MD5_HASHBLOCKLEN); for (int i = 0; i < keylen; i++) { innerkey[i] ^= keyptr[i]; outerkey[i] ^= keyptr[i]; } /* Now do the hashes */ chash_start(HMAC_MD5, &md5_base); chash_mid(HMAC_MD5, &md5_base, innerkey); chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash); chash_start(HMAC_MD5, &md5_base); chash_mid(HMAC_MD5, &md5_base, outerkey); chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash); /* Encode the final hash as a hex string, limited by output buffer size */ p = buf; for (int i = 0, j = len; i < MD5_HASHLEN; i++) { if (j-- <= 0) break; *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; if (j-- <= 0) break; *p++ = hex_digits[finalhash[i] & 0x0f]; } return; } #endif /*SUPPORT_SRS*/ /************************************************* * Read and evaluate a condition * *************************************************/ /* Arguments: s points to the start of the condition text resetok points to a BOOL which is written false if it is unsafe to free memory. Certain condition types (acl) may have side-effect allocation which must be preserved. yield points to a BOOL to hold the result of the condition test; if NULL, we are just reading through a condition that is part of an "or" combination to check syntax, or in a state where the answer isn't required Returns: a pointer to the first character after the condition, or NULL after an error */ static const uschar * eval_condition(const uschar *s, BOOL *resetok, BOOL *yield) { BOOL testfor = TRUE; BOOL tempcond, combined_cond; BOOL *subcondptr; BOOL sub2_honour_dollar = TRUE; BOOL is_forany, is_json, is_jsons; int rc, cond_type, roffset; int_eximarith_t num[2]; struct stat statbuf; uschar * opname; uschar name[256]; const uschar *sub[10]; const pcre *re; const uschar *rerror; for (;;) if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break; switch(cond_type = identify_operator(&s, &opname)) { /* def: tests for a non-empty variable, or for the existence of a header. If yield == NULL we are in a skipping state, and don't care about the answer. */ case ECOND_DEF: { uschar * t; if (*s != ':') { expand_string_message = US"\":\" expected after \"def\""; return NULL; } s = read_name(name, sizeof(name), s+1, US"_"); /* Test for a header's existence. If the name contains a closing brace character, this may be a user error where the terminating colon has been omitted. Set a flag to adjust a subsequent error message in this case. */ if ( ( *(t = name) == 'h' || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h' ) && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0) ) { s = read_header_name(name, sizeof(name), s); /* {-for-text-editors */ if (Ustrchr(name, '}') != NULL) malformed_header = TRUE; if (yield) *yield = (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor; } /* Test for a variable's having a non-empty value. A non-existent variable causes an expansion failure. */ else { if (!(t = find_variable(name, TRUE, yield == NULL, NULL))) { expand_string_message = name[0] ? string_sprintf("unknown variable \"%s\" after \"def:\"", name) : US"variable name omitted after \"def:\""; check_variable_error_message(name); return NULL; } if (yield) *yield = (t[0] != 0) == testfor; } return s; } /* first_delivery tests for first delivery attempt */ case ECOND_FIRST_DELIVERY: if (yield) *yield = f.deliver_firsttime == testfor; return s; /* queue_running tests for any process started by a queue runner */ case ECOND_QUEUE_RUNNING: if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor; return s; /* exists: tests for file existence isip: tests for any IP address isip4: tests for an IPv4 address isip6: tests for an IPv6 address pam: does PAM authentication radius: does RADIUS authentication ldapauth: does LDAP authentication pwcheck: does Cyrus SASL pwcheck authentication */ case ECOND_EXISTS: case ECOND_ISIP: case ECOND_ISIP4: case ECOND_ISIP6: case ECOND_PAM: case ECOND_RADIUS: case ECOND_LDAPAUTH: case ECOND_PWCHECK: if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok); if (!sub[0]) return NULL; /* {-for-text-editors */ if (*s++ != '}') goto COND_FAILED_CURLY_END; if (!yield) return s; /* No need to run the test if skipping */ switch(cond_type) { case ECOND_EXISTS: if ((expand_forbid & RDO_EXISTS) != 0) { expand_string_message = US"File existence tests are not permitted"; return NULL; } *yield = (Ustat(sub[0], &statbuf) == 0) == testfor; break; case ECOND_ISIP: case ECOND_ISIP4: case ECOND_ISIP6: rc = string_is_ip_address(sub[0], NULL); *yield = ((cond_type == ECOND_ISIP)? (rc != 0) : (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor; break; /* Various authentication tests - all optionally compiled */ case ECOND_PAM: #ifdef SUPPORT_PAM rc = auth_call_pam(sub[0], &expand_string_message); goto END_AUTH; #else goto COND_FAILED_NOT_COMPILED; #endif /* SUPPORT_PAM */ case ECOND_RADIUS: #ifdef RADIUS_CONFIG_FILE rc = auth_call_radius(sub[0], &expand_string_message); goto END_AUTH; #else goto COND_FAILED_NOT_COMPILED; #endif /* RADIUS_CONFIG_FILE */ case ECOND_LDAPAUTH: #ifdef LOOKUP_LDAP { /* Just to keep the interface the same */ BOOL do_cache; int old_pool = store_pool; store_pool = POOL_SEARCH; rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL, &expand_string_message, &do_cache); store_pool = old_pool; } goto END_AUTH; #else goto COND_FAILED_NOT_COMPILED; #endif /* LOOKUP_LDAP */ case ECOND_PWCHECK: #ifdef CYRUS_PWCHECK_SOCKET rc = auth_call_pwcheck(sub[0], &expand_string_message); goto END_AUTH; #else goto COND_FAILED_NOT_COMPILED; #endif /* CYRUS_PWCHECK_SOCKET */ #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \ defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET) END_AUTH: if (rc == ERROR || rc == DEFER) return NULL; *yield = (rc == OK) == testfor; #endif } return s; /* call ACL (in a conditional context). Accept true, deny false. Defer is a forced-fail. Anything set by message= goes to $value. Up to ten parameters are used; we use the braces round the name+args like the saslauthd condition does, to permit a variable number of args. See also the expansion-item version EITEM_ACL and the traditional acl modifier ACLC_ACL. Since the ACL may allocate new global variables, tell our caller to not reclaim memory. */ case ECOND_ACL: /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */ { uschar *sub[10]; uschar *user_msg; BOOL cond = FALSE; Uskip_whitespace(&s); if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/ switch(read_subs(sub, nelem(sub), 1, &s, yield == NULL, TRUE, name, resetok)) { case 1: expand_string_message = US"too few arguments or bracketing " "error for acl"; case 2: case 3: return NULL; } if (yield) { int rc; *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */ switch(rc = eval_acl(sub, nelem(sub), &user_msg)) { case OK: cond = TRUE; case FAIL: lookup_value = NULL; if (user_msg) lookup_value = string_copy(user_msg); *yield = cond == testfor; break; case DEFER: f.expand_string_forcedfail = TRUE; /*FALLTHROUGH*/ default: expand_string_message = string_sprintf("%s from acl \"%s\"", rc_names[rc], sub[0]); return NULL; } } return s; } /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used: ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}} However, the last two are optional. That is why the whole set is enclosed in their own set of braces. */ case ECOND_SASLAUTHD: #ifndef CYRUS_SASLAUTHD_SOCKET goto COND_FAILED_NOT_COMPILED; #else { uschar *sub[4]; Uskip_whitespace(&s); if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, name, resetok)) { case 1: expand_string_message = US"too few arguments or bracketing " "error for saslauthd"; case 2: case 3: return NULL; } if (!sub[2]) sub[3] = NULL; /* realm if no service */ if (yield) { int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3], &expand_string_message); if (rc == ERROR || rc == DEFER) return NULL; *yield = (rc == OK) == testfor; } return s; } #endif /* CYRUS_SASLAUTHD_SOCKET */ /* symbolic operators for numeric and string comparison, and a number of other operators, all requiring two arguments. crypteq: encrypts plaintext and compares against an encrypted text, using crypt(), crypt16(), MD5 or SHA-1 inlist/inlisti: checks if first argument is in the list of the second match: does a regular expression match and sets up the numerical variables if it succeeds match_address: matches in an address list match_domain: matches in a domain list match_ip: matches a host list that is restricted to IP addresses match_local_part: matches in a local part list */ case ECOND_MATCH_ADDRESS: case ECOND_MATCH_DOMAIN: case ECOND_MATCH_IP: case ECOND_MATCH_LOCAL_PART: #ifndef EXPAND_LISTMATCH_RHS sub2_honour_dollar = FALSE; #endif /* FALLTHROUGH */ case ECOND_CRYPTEQ: case ECOND_INLIST: case ECOND_INLISTI: case ECOND_MATCH: case ECOND_NUM_L: /* Numerical comparisons */ case ECOND_NUM_LE: case ECOND_NUM_E: case ECOND_NUM_EE: case ECOND_NUM_G: case ECOND_NUM_GE: case ECOND_STR_LT: /* String comparisons */ case ECOND_STR_LTI: case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_EQ: case ECOND_STR_EQI: case ECOND_STR_GT: case ECOND_STR_GTI: case ECOND_STR_GE: case ECOND_STR_GEI: for (int i = 0; i < 2; i++) { /* Sometimes, we don't expand substrings; too many insecure configurations created using match_address{}{} and friends, where the second param includes information from untrustworthy sources. */ BOOL honour_dollar = TRUE; if ((i > 0) && !sub2_honour_dollar) honour_dollar = FALSE; if (Uskip_whitespace(&s) != '{') { if (i == 0) goto COND_FAILED_CURLY_START; expand_string_message = string_sprintf("missing 2nd string in {} " "after \"%s\"", opname); return NULL; } if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL, honour_dollar, resetok))) return NULL; DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$')) debug_printf_indent("WARNING: the second arg is NOT expanded," " for security reasons\n"); if (*s++ != '}') goto COND_FAILED_CURLY_END; /* Convert to numerical if required; we know that the names of all the conditions that compare numbers do not start with a letter. This just saves checking for them individually. */ if (!isalpha(opname[0]) && yield) if (sub[i][0] == 0) { num[i] = 0; DEBUG(D_expand) debug_printf_indent("empty string cast to zero for numerical comparison\n"); } else { num[i] = expanded_string_integer(sub[i], FALSE); if (expand_string_message) return NULL; } } /* Result not required */ if (!yield) return s; /* Do an appropriate comparison */ switch(cond_type) { case ECOND_NUM_E: case ECOND_NUM_EE: tempcond = (num[0] == num[1]); break; case ECOND_NUM_G: tempcond = (num[0] > num[1]); break; case ECOND_NUM_GE: tempcond = (num[0] >= num[1]); break; case ECOND_NUM_L: tempcond = (num[0] < num[1]); break; case ECOND_NUM_LE: tempcond = (num[0] <= num[1]); break; case ECOND_STR_LT: tempcond = (Ustrcmp(sub[0], sub[1]) < 0); break; case ECOND_STR_LTI: tempcond = (strcmpic(sub[0], sub[1]) < 0); break; case ECOND_STR_LE: tempcond = (Ustrcmp(sub[0], sub[1]) <= 0); break; case ECOND_STR_LEI: tempcond = (strcmpic(sub[0], sub[1]) <= 0); break; case ECOND_STR_EQ: tempcond = (Ustrcmp(sub[0], sub[1]) == 0); break; case ECOND_STR_EQI: tempcond = (strcmpic(sub[0], sub[1]) == 0); break; case ECOND_STR_GT: tempcond = (Ustrcmp(sub[0], sub[1]) > 0); break; case ECOND_STR_GTI: tempcond = (strcmpic(sub[0], sub[1]) > 0); break; case ECOND_STR_GE: tempcond = (Ustrcmp(sub[0], sub[1]) >= 0); break; case ECOND_STR_GEI: tempcond = (strcmpic(sub[0], sub[1]) >= 0); break; case ECOND_MATCH: /* Regular expression match */ if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror, &roffset, NULL))) { expand_string_message = string_sprintf("regular expression error in " "\"%s\": %s at offset %d", sub[1], rerror, roffset); return NULL; } tempcond = regex_match_and_setup(re, sub[0], 0, -1); break; case ECOND_MATCH_ADDRESS: /* Match in an address list */ rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL); goto MATCHED_SOMETHING; case ECOND_MATCH_DOMAIN: /* Match in a domain list */ rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL, MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL); goto MATCHED_SOMETHING; case ECOND_MATCH_IP: /* Match IP address in a host list */ if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0) { expand_string_message = string_sprintf("\"%s\" is not an IP address", sub[0]); return NULL; } else { unsigned int *nullcache = NULL; check_host_block cb; cb.host_name = US""; cb.host_address = sub[0]; /* If the host address starts off ::ffff: it is an IPv6 address in IPv4-compatible mode. Find the IPv4 part for checking against IPv4 addresses. */ cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)? cb.host_address + 7 : cb.host_address; rc = match_check_list( &sub[1], /* the list */ 0, /* separator character */ &hostlist_anchor, /* anchor pointer */ &nullcache, /* cache pointer */ check_host, /* function for testing */ &cb, /* argument for function */ MCL_HOST, /* type of check */ sub[0], /* text for debugging */ NULL); /* where to pass back data */ } goto MATCHED_SOMETHING; case ECOND_MATCH_LOCAL_PART: rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL, MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL); /* Fall through */ /* VVVVVVVVVVVV */ MATCHED_SOMETHING: switch(rc) { case OK: tempcond = TRUE; break; case FAIL: tempcond = FALSE; break; case DEFER: expand_string_message = string_sprintf("unable to complete match " "against \"%s\": %s", sub[1], search_error_message); return NULL; } break; /* Various "encrypted" comparisons. If the second string starts with "{" then an encryption type is given. Default to crypt() or crypt16() (build-time choice). */ /* }-for-text-editors */ case ECOND_CRYPTEQ: #ifndef SUPPORT_CRYPTEQ goto COND_FAILED_NOT_COMPILED; #else if (strncmpic(sub[1], US"{md5}", 5) == 0) { int sublen = Ustrlen(sub[1]+5); md5 base; uschar digest[16]; md5_start(&base); md5_end(&base, sub[0], Ustrlen(sub[0]), digest); /* If the length that we are comparing against is 24, the MD5 digest is expressed as a base64 string. This is the way LDAP does it. However, some other software uses a straightforward hex representation. We assume this if the length is 32. Other lengths fail. */ if (sublen == 24) { uschar *coded = b64encode(CUS digest, 16); DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n" " subject=%s\n crypted=%s\n", coded, sub[1]+5); tempcond = (Ustrcmp(coded, sub[1]+5) == 0); } else if (sublen == 32) { uschar coded[36]; for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]); coded[32] = 0; DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n" " subject=%s\n crypted=%s\n", coded, sub[1]+5); tempcond = (strcmpic(coded, sub[1]+5) == 0); } else { DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: " "fail\n crypted=%s\n", sub[1]+5); tempcond = FALSE; } } else if (strncmpic(sub[1], US"{sha1}", 6) == 0) { int sublen = Ustrlen(sub[1]+6); hctx h; uschar digest[20]; sha1_start(&h); sha1_end(&h, sub[0], Ustrlen(sub[0]), digest); /* If the length that we are comparing against is 28, assume the SHA1 digest is expressed as a base64 string. If the length is 40, assume a straightforward hex representation. Other lengths fail. */ if (sublen == 28) { uschar *coded = b64encode(CUS digest, 20); DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n" " subject=%s\n crypted=%s\n", coded, sub[1]+6); tempcond = (Ustrcmp(coded, sub[1]+6) == 0); } else if (sublen == 40) { uschar coded[44]; for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]); coded[40] = 0; DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n" " subject=%s\n crypted=%s\n", coded, sub[1]+6); tempcond = (strcmpic(coded, sub[1]+6) == 0); } else { DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: " "fail\n crypted=%s\n", sub[1]+6); tempcond = FALSE; } } else /* {crypt} or {crypt16} and non-{ at start */ /* }-for-text-editors */ { int which = 0; uschar *coded; if (strncmpic(sub[1], US"{crypt}", 7) == 0) { sub[1] += 7; which = 1; } else if (strncmpic(sub[1], US"{crypt16}", 9) == 0) { sub[1] += 9; which = 2; } else if (sub[1][0] == '{') /* }-for-text-editors */ { expand_string_message = string_sprintf("unknown encryption mechanism " "in \"%s\"", sub[1]); return NULL; } switch(which) { case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break; case 1: coded = US crypt(CS sub[0], CS sub[1]); break; default: coded = US crypt16(CS sub[0], CS sub[1]); break; } #define STR(s) # s #define XSTR(s) STR(s) DEBUG(D_auth) debug_printf("crypteq: using %s()\n" " subject=%s\n crypted=%s\n", which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16", coded, sub[1]); #undef STR #undef XSTR /* If the encrypted string contains fewer than two characters (for the salt), force failure. Otherwise we get false positives: with an empty string the yield of crypt() is an empty string! */ if (coded) tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0; else if (errno == EINVAL) tempcond = FALSE; else { expand_string_message = string_sprintf("crypt error: %s\n", US strerror(errno)); return NULL; } } break; #endif /* SUPPORT_CRYPTEQ */ case ECOND_INLIST: case ECOND_INLISTI: { const uschar * list = sub[1]; int sep = 0; uschar *save_iterate_item = iterate_item; int (*compare)(const uschar *, const uschar *); DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]); tempcond = FALSE; compare = cond_type == ECOND_INLISTI ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp; while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0))) { DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item); if (compare(sub[0], iterate_item) == 0) { tempcond = TRUE; break; } } iterate_item = save_iterate_item; } } /* Switch for comparison conditions */ *yield = tempcond == testfor; return s; /* End of comparison conditions */ /* and/or: computes logical and/or of several conditions */ case ECOND_AND: case ECOND_OR: subcondptr = (yield == NULL) ? NULL : &tempcond; combined_cond = (cond_type == ECOND_AND); Uskip_whitespace(&s); if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ for (;;) { /* {-for-text-editors */ if (Uskip_whitespace(&s) == '}') break; if (*s != '{') /* }-for-text-editors */ { expand_string_message = string_sprintf("each subcondition " "inside an \"%s{...}\" condition must be in its own {}", opname); return NULL; } if (!(s = eval_condition(s+1, resetok, subcondptr))) { expand_string_message = string_sprintf("%s inside \"%s{...}\" condition", expand_string_message, opname); return NULL; } Uskip_whitespace(&s); /* {-for-text-editors */ if (*s++ != '}') { /* {-for-text-editors */ expand_string_message = string_sprintf("missing } at end of condition " "inside \"%s\" group", opname); return NULL; } if (yield) if (cond_type == ECOND_AND) { combined_cond &= tempcond; if (!combined_cond) subcondptr = NULL; /* once false, don't */ } /* evaluate any more */ else { combined_cond |= tempcond; if (combined_cond) subcondptr = NULL; /* once true, don't */ } /* evaluate any more */ } if (yield) *yield = (combined_cond == testfor); return ++s; /* forall/forany: iterates a condition with different values */ case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY; case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY; case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY; case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY; case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY; case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY; FORMANY: { const uschar * list; int sep = 0; uschar *save_iterate_item = iterate_item; DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname); Uskip_whitespace(&s); if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok))) return NULL; /* {-for-text-editors */ if (*s++ != '}') goto COND_FAILED_CURLY_END; Uskip_whitespace(&s); if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ sub[1] = s; /* Call eval_condition once, with result discarded (as if scanning a "false" part). This allows us to find the end of the condition, because if the list it empty, we won't actually evaluate the condition for real. */ if (!(s = eval_condition(sub[1], resetok, NULL))) { expand_string_message = string_sprintf("%s inside \"%s\" condition", expand_string_message, opname); return NULL; } Uskip_whitespace(&s); /* {-for-text-editors */ if (*s++ != '}') { /* {-for-text-editors */ expand_string_message = string_sprintf("missing } at end of condition " "inside \"%s\"", opname); return NULL; } if (yield) *yield = !testfor; list = sub[0]; if (is_json) list = dewrap(string_copy(list), US"[]"); while ((iterate_item = is_json ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0))) { if (is_jsons) if (!(iterate_item = dewrap(iterate_item, US"\"\""))) { expand_string_message = string_sprintf("%s wrapping string result for extract jsons", expand_string_message); iterate_item = save_iterate_item; return NULL; } DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item); if (!eval_condition(sub[1], resetok, &tempcond)) { expand_string_message = string_sprintf("%s inside \"%s\" condition", expand_string_message, opname); iterate_item = save_iterate_item; return NULL; } DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname, tempcond? "true":"false"); if (yield) *yield = (tempcond == testfor); if (tempcond == is_forany) break; } iterate_item = save_iterate_item; return s; } /* The bool{} expansion condition maps a string to boolean. The values supported should match those supported by the ACL condition (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas of true/false. Note that Router "condition" rules have a different interpretation, where general data can be used and only a few values map to FALSE. Note that readconf.c boolean matching, for boolean configuration options, only matches true/yes/false/no. The bool_lax{} condition matches the Router logic, which is much more liberal. */ case ECOND_BOOL: case ECOND_BOOL_LAX: { uschar *sub_arg[1]; uschar *t, *t2; uschar *ourname; size_t len; BOOL boolvalue = FALSE; if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool"; switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok)) { case 1: expand_string_message = string_sprintf( "too few arguments or bracketing error for %s", ourname); /*FALLTHROUGH*/ case 2: case 3: return NULL; } t = sub_arg[0]; Uskip_whitespace(&t); if ((len = Ustrlen(t))) { /* trailing whitespace: seems like a good idea to ignore it too */ t2 = t + len - 1; while (isspace(*t2)) t2--; if (t2 != (t + len)) { *++t2 = '\0'; len = t2 - t; } } DEBUG(D_expand) debug_printf_indent("considering %s: %s\n", ourname, len ? t : US""); /* logic for the lax case from expand_check_condition(), which also does expands, and the logic is both short and stable enough that there should be no maintenance burden from replicating it. */ if (len == 0) boolvalue = FALSE; else if (*t == '-' ? Ustrspn(t+1, "0123456789") == len-1 : Ustrspn(t, "0123456789") == len) { boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE; /* expand_check_condition only does a literal string "0" check */ if ((cond_type == ECOND_BOOL_LAX) && (len > 1)) boolvalue = TRUE; } else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0) boolvalue = TRUE; else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0) boolvalue = FALSE; else if (cond_type == ECOND_BOOL_LAX) boolvalue = TRUE; else { expand_string_message = string_sprintf("unrecognised boolean " "value \"%s\"", t); return NULL; } DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname, boolvalue? "true":"false"); if (yield) *yield = (boolvalue == testfor); return s; } #ifdef SUPPORT_SRS case ECOND_INBOUND_SRS: /* ${if inbound_srs {local_part}{secret} {yes}{no}} */ { uschar * sub[2]; const pcre * re; int ovec[3*(4+1)]; int n, quoting = 0; uschar cksum[4]; BOOL boolvalue = FALSE; switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, name, resetok)) { case 1: expand_string_message = US"too few arguments or bracketing " "error for inbound_srs"; case 2: case 3: return NULL; } /* Match the given local_part against the SRS-encoded pattern */ re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$", TRUE, FALSE); if (pcre_exec(re, NULL, CS sub[0], Ustrlen(sub[0]), 0, PCRE_EOPT, ovec, nelem(ovec)) < 0) { DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n"); goto srs_result; } if (sub[0][0] == '"') quoting = 1; else for (uschar * s = sub[0]; *s; s++) if (!isalnum(*s) && Ustrchr(".!#$%&'*+-/=?^_`{|}~", *s) == NULL) { quoting = 1; break; } if (quoting) DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n"); /* Record the (quoted, if needed) decoded recipient as $srs_recipient */ srs_recipient = string_sprintf("%.*s%.*S%.*s@%.*S", /* lowercased */ quoting, "\"", ovec[9]-ovec[8], sub[0] + ovec[8], /* substring 4 */ quoting, "\"", ovec[7]-ovec[6], sub[0] + ovec[6]); /* substring 3 */ /* If a zero-length secret was given, we're done. Otherwise carry on and validate the given SRS local_part againt our secret. */ if (!*sub[1]) { boolvalue = TRUE; goto srs_result; } /* check the timestamp */ { struct timeval now; uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */ long d; gettimeofday(&now, NULL); now.tv_sec /= 86400; /* days since epoch */ /* Decode substring 2 from base32 to a number */ for (d = 0, n = ovec[5]-ovec[4]; n; n--) { uschar * t = Ustrchr(base32_chars, *ss++); d = d * 32 + (t - base32_chars); } if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */ { DEBUG(D_expand) debug_printf("SRS too old\n"); goto srs_result; } } /* check length of substring 1, the offered checksum */ if (ovec[3]-ovec[2] != 4) { DEBUG(D_expand) debug_printf("SRS checksum wrong size\n"); goto srs_result; } /* Hash the address with our secret, and compare that computed checksum with the one extracted from the arg */ hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum)); if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0) { DEBUG(D_expand) debug_printf("SRS checksum mismatch\n"); goto srs_result; } boolvalue = TRUE; srs_result: if (yield) *yield = (boolvalue == testfor); return s; } #endif /*SUPPORT_SRS*/ /* Unknown condition */ default: if (!expand_string_message || !*expand_string_message) expand_string_message = string_sprintf("unknown condition \"%s\"", opname); return NULL; } /* End switch on condition type */ /* Missing braces at start and end of data */ COND_FAILED_CURLY_START: expand_string_message = string_sprintf("missing { after \"%s\"", opname); return NULL; COND_FAILED_CURLY_END: expand_string_message = string_sprintf("missing } at end of \"%s\" condition", opname); return NULL; /* A condition requires code that is not compiled */ #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \ !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \ !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET) COND_FAILED_NOT_COMPILED: expand_string_message = string_sprintf("support for \"%s\" not compiled", opname); return NULL; #endif } /************************************************* * Save numerical variables * *************************************************/ /* This function is called from items such as "if" that want to preserve and restore the numbered variables. Arguments: save_expand_string points to an array of pointers to set save_expand_nlength points to an array of ints for the lengths Returns: the value of expand max to save */ static int save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength) { for (int i = 0; i <= expand_nmax; i++) { save_expand_nstring[i] = expand_nstring[i]; save_expand_nlength[i] = expand_nlength[i]; } return expand_nmax; } /************************************************* * Restore numerical variables * *************************************************/ /* This function restored saved values of numerical strings. Arguments: save_expand_nmax the number of strings to restore save_expand_string points to an array of pointers save_expand_nlength points to an array of ints Returns: nothing */ static void restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring, int *save_expand_nlength) { expand_nmax = save_expand_nmax; for (int i = 0; i <= expand_nmax; i++) { expand_nstring[i] = save_expand_nstring[i]; expand_nlength[i] = save_expand_nlength[i]; } } /************************************************* * Handle yes/no substrings * *************************************************/ /* This function is used by ${if}, ${lookup} and ${extract} to handle the alternative substrings that depend on whether or not the condition was true, or the lookup or extraction succeeded. The substrings always have to be expanded, to check their syntax, but "skipping" is set when the result is not needed - this avoids unnecessary nested lookups. Arguments: skipping TRUE if we were skipping when this item was reached yes TRUE if the first string is to be used, else use the second save_lookup a value to put back into lookup_value before the 2nd expansion sptr points to the input string pointer yieldptr points to the output growable-string pointer type "lookup", "if", "extract", "run", "env", "listextract" or "certextract" for error message resetok if not NULL, pointer to flag - write FALSE if unsafe to reset the store. Returns: 0 OK; lookup_value has been reset to save_lookup 1 expansion failed 2 expansion failed because of bracketing error */ static int process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr, gstring ** yieldptr, uschar *type, BOOL *resetok) { int rc = 0; const uschar *s = *sptr; /* Local value */ uschar *sub1, *sub2; const uschar * errwhere; /* If there are no following strings, we substitute the contents of $value for lookups and for extractions in the success case. For the ${if item, the string "true" is substituted. In the fail case, nothing is substituted for all three items. */ if (skip_whitespace(&s) == '}') { if (type[0] == 'i') { if (yes && !skipping) *yieldptr = string_catn(*yieldptr, US"true", 4); } else { if (yes && lookup_value && !skipping) *yieldptr = string_cat(*yieldptr, lookup_value); lookup_value = save_lookup; } s++; goto RETURN; } /* The first following string must be braced. */ if (*s++ != '{') { errwhere = US"'yes' part did not start with '{'"; goto FAILED_CURLY; } /* Expand the first substring. Forced failures are noticed only if we actually want this string. Set skipping in the call in the fail case (this will always be the case if we were already skipping). */ sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok); if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED; f.expand_string_forcedfail = FALSE; if (*s++ != '}') { errwhere = US"'yes' part did not end with '}'"; goto FAILED_CURLY; } /* If we want the first string, add it to the output */ if (yes) *yieldptr = string_cat(*yieldptr, sub1); /* If this is called from a lookup/env or a (cert)extract, we want to restore $value to what it was at the start of the item, so that it has this value during the second string expansion. For the call from "if" or "run" to this function, save_lookup is set to lookup_value, so that this statement does nothing. */ lookup_value = save_lookup; /* There now follows either another substring, or "fail", or nothing. This time, forced failures are noticed only if we want the second string. We must set skipping in the nested call if we don't want this string, or if we were already skipping. */ if (skip_whitespace(&s) == '{') { sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok); if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED; f.expand_string_forcedfail = FALSE; if (*s++ != '}') { errwhere = US"'no' part did not start with '{'"; goto FAILED_CURLY; } /* If we want the second string, add it to the output */ if (!yes) *yieldptr = string_cat(*yieldptr, sub2); } /* If there is no second string, but the word "fail" is present when the use of the second string is wanted, set a flag indicating it was a forced failure rather than a syntactic error. Swallow the terminating } in case this is nested inside another lookup or if or extract. */ else if (*s != '}') { uschar name[256]; /* deconst cast ok here as source is s anyway */ s = US read_name(name, sizeof(name), s, US"_"); if (Ustrcmp(name, "fail") == 0) { if (!yes && !skipping) { Uskip_whitespace(&s); if (*s++ != '}') { errwhere = US"did not close with '}' after forcedfail"; goto FAILED_CURLY; } expand_string_message = string_sprintf("\"%s\" failed and \"fail\" requested", type); f.expand_string_forcedfail = TRUE; goto FAILED; } } else { expand_string_message = string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type); goto FAILED; } } /* All we have to do now is to check on the final closing brace. */ skip_whitespace(&s); if (*s++ != '}') { errwhere = US"did not close with '}'"; goto FAILED_CURLY; } RETURN: /* Update the input pointer value before returning */ *sptr = s; return rc; FAILED_CURLY: /* Get here if there is a bracketing failure */ expand_string_message = string_sprintf( "curly-bracket problem in conditional yes/no parsing: %s\n" " remaining string is '%s'", errwhere, --s); rc = 2; goto RETURN; FAILED: /* Get here for other failures */ rc = 1; goto RETURN; } /******************************************************** * prvs: Get last three digits of days since Jan 1, 1970 * ********************************************************/ /* This is needed to implement the "prvs" BATV reverse path signing scheme Argument: integer "days" offset to add or substract to or from the current number of days. Returns: pointer to string containing the last three digits of the number of days since Jan 1, 1970, modified by the offset argument, NULL if there was an error in the conversion. */ static uschar * prvs_daystamp(int day_offset) { uschar *days = store_get(32, FALSE); /* Need at least 24 for cases */ (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */ (time(NULL) + day_offset*86400)/86400); return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100"; } /******************************************************** * prvs: perform HMAC-SHA1 computation of prvs bits * ********************************************************/ /* This is needed to implement the "prvs" BATV reverse path signing scheme Arguments: address RFC2821 Address to use key The key to use (must be less than 64 characters in size) key_num Single-digit key number to use. Defaults to '0' when NULL. Returns: pointer to string containing the first three bytes of the final hash in hex format, NULL if there was an error in the process. */ static uschar * prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp) { gstring * hash_source; uschar * p; hctx h; uschar innerhash[20]; uschar finalhash[20]; uschar innerkey[64]; uschar outerkey[64]; uschar *finalhash_hex; if (!key_num) key_num = US"0"; if (Ustrlen(key) > 64) return NULL; hash_source = string_catn(NULL, key_num, 1); hash_source = string_catn(hash_source, daystamp, 3); hash_source = string_cat(hash_source, address); (void) string_from_gstring(hash_source); DEBUG(D_expand) debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s); memset(innerkey, 0x36, 64); memset(outerkey, 0x5c, 64); for (int i = 0; i < Ustrlen(key); i++) { innerkey[i] ^= key[i]; outerkey[i] ^= key[i]; } chash_start(HMAC_SHA1, &h); chash_mid(HMAC_SHA1, &h, innerkey); chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash); chash_start(HMAC_SHA1, &h); chash_mid(HMAC_SHA1, &h, outerkey); chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash); /* Hashing is deemed sufficient to de-taint any input data */ p = finalhash_hex = store_get(40, FALSE); for (int i = 0; i < 3; i++) { *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; *p++ = hex_digits[finalhash[i] & 0x0f]; } *p = '\0'; return finalhash_hex; } /************************************************* * Join a file onto the output string * *************************************************/ /* This is used for readfile/readsock and after a run expansion. It joins the contents of a file onto the output string, globally replacing newlines with a given string (optionally). Arguments: f the FILE yield pointer to the expandable string struct eol newline replacement string, or NULL Returns: new pointer for expandable string, terminated if non-null */ gstring * cat_file(FILE *f, gstring *yield, uschar *eol) { uschar buffer[1024]; while (Ufgets(buffer, sizeof(buffer), f)) { int len = Ustrlen(buffer); if (eol && buffer[len-1] == '\n') len--; yield = string_catn(yield, buffer, len); if (eol && buffer[len]) yield = string_cat(yield, eol); } (void) string_from_gstring(yield); return yield; } #ifndef DISABLE_TLS gstring * cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol) { int rc; uschar buffer[1024]; /*XXX could we read direct into a pre-grown string? */ while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0) for (uschar * s = buffer; rc--; s++) yield = eol && *s == '\n' ? string_cat(yield, eol) : string_catn(yield, s, 1); /* We assume that all errors, and any returns of zero bytes, are actually EOF. */ (void) string_from_gstring(yield); return yield; } #endif /************************************************* * Evaluate numeric expression * *************************************************/ /* This is a set of mutually recursive functions that evaluate an arithmetic expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of these functions that is called from elsewhere is eval_expr, whose interface is: Arguments: sptr pointer to the pointer to the string - gets updated decimal TRUE if numbers are to be assumed decimal error pointer to where to put an error message - must be NULL on input endket TRUE if ')' must terminate - FALSE for external call Returns: on success: the value of the expression, with *error still NULL on failure: an undefined value, with *error = a message */ static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **); static int_eximarith_t eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket) { uschar *s = *sptr; int_eximarith_t x = eval_op_or(&s, decimal, error); if (!*error) if (endket) if (*s != ')') *error = US"expecting closing parenthesis"; else while (isspace(*++s)); else if (*s) *error = US"expecting operator"; *sptr = s; return x; } static int_eximarith_t eval_number(uschar **sptr, BOOL decimal, uschar **error) { int c; int_eximarith_t n; uschar *s = *sptr; if (isdigit((c = Uskip_whitespace(&s)))) { int count; (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count); s += count; switch (tolower(*s)) { default: break; case 'k': n *= 1024; s++; break; case 'm': n *= 1024*1024; s++; break; case 'g': n *= 1024*1024*1024; s++; break; } Uskip_whitespace(&s); } else if (c == '(') { s++; n = eval_expr(&s, decimal, error, 1); } else { *error = US"expecting number or opening parenthesis"; n = 0; } *sptr = s; return n; } static int_eximarith_t eval_op_unary(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x; Uskip_whitespace(&s); if (*s == '+' || *s == '-' || *s == '~') { int op = *s++; x = eval_op_unary(&s, decimal, error); if (op == '-') x = -x; else if (op == '~') x = ~x; } else x = eval_number(&s, decimal, error); *sptr = s; return x; } static int_eximarith_t eval_op_mult(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x = eval_op_unary(&s, decimal, error); if (!*error) { while (*s == '*' || *s == '/' || *s == '%') { int op = *s++; int_eximarith_t y = eval_op_unary(&s, decimal, error); if (*error) break; /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where * -N*M is INT_MIN will yield INT_MIN. * Since we don't support floating point, this is somewhat simpler. * Ideally, we'd return an error, but since we overflow for all other * arithmetic, consistency suggests otherwise, but what's the correct value * to use? There is none. * The C standard guarantees overflow for unsigned arithmetic but signed * overflow invokes undefined behaviour; in practice, this is overflow * except for converting INT_MIN to INT_MAX+1. We also can't guarantee * that long/longlong larger than int are available, or we could just work * with larger types. We should consider whether to guarantee 32bit eval * and 64-bit working variables, with errors returned. For now ... * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we * can just let the other invalid results occur otherwise, as they have * until now. For this one case, we can coerce. */ if (y == -1 && x == EXIM_ARITH_MIN && op != '*') { DEBUG(D_expand) debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n", EXIM_ARITH_MIN, op, EXIM_ARITH_MAX); x = EXIM_ARITH_MAX; continue; } if (op == '*') x *= y; else { if (y == 0) { *error = (op == '/') ? US"divide by zero" : US"modulo by zero"; x = 0; break; } if (op == '/') x /= y; else x %= y; } } } *sptr = s; return x; } static int_eximarith_t eval_op_sum(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x = eval_op_mult(&s, decimal, error); if (!*error) { while (*s == '+' || *s == '-') { int op = *s++; int_eximarith_t y = eval_op_mult(&s, decimal, error); if (*error) break; if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2) || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2))) { /* over-conservative check */ *error = op == '+' ? US"overflow in sum" : US"overflow in difference"; break; } if (op == '+') x += y; else x -= y; } } *sptr = s; return x; } static int_eximarith_t eval_op_shift(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x = eval_op_sum(&s, decimal, error); if (!*error) { while ((*s == '<' || *s == '>') && s[1] == s[0]) { int_eximarith_t y; int op = *s++; s++; y = eval_op_sum(&s, decimal, error); if (*error) break; if (op == '<') x <<= y; else x >>= y; } } *sptr = s; return x; } static int_eximarith_t eval_op_and(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x = eval_op_shift(&s, decimal, error); if (!*error) { while (*s == '&') { int_eximarith_t y; s++; y = eval_op_shift(&s, decimal, error); if (*error) break; x &= y; } } *sptr = s; return x; } static int_eximarith_t eval_op_xor(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x = eval_op_and(&s, decimal, error); if (!*error) { while (*s == '^') { int_eximarith_t y; s++; y = eval_op_and(&s, decimal, error); if (*error) break; x ^= y; } } *sptr = s; return x; } static int_eximarith_t eval_op_or(uschar **sptr, BOOL decimal, uschar **error) { uschar *s = *sptr; int_eximarith_t x = eval_op_xor(&s, decimal, error); if (!*error) { while (*s == '|') { int_eximarith_t y; s++; y = eval_op_xor(&s, decimal, error); if (*error) break; x |= y; } } *sptr = s; return x; } /************************************************/ /* Comparison operation for sort expansion. We need to avoid re-expanding the fields being compared, so need a custom routine. Arguments: cond_type Comparison operator code leftarg, rightarg Arguments for comparison Return true iff (leftarg compare rightarg) */ static BOOL sortsbefore(int cond_type, BOOL alpha_cond, const uschar * leftarg, const uschar * rightarg) { int_eximarith_t l_num, r_num; if (!alpha_cond) { l_num = expanded_string_integer(leftarg, FALSE); if (expand_string_message) return FALSE; r_num = expanded_string_integer(rightarg, FALSE); if (expand_string_message) return FALSE; switch (cond_type) { case ECOND_NUM_G: return l_num > r_num; case ECOND_NUM_GE: return l_num >= r_num; case ECOND_NUM_L: return l_num < r_num; case ECOND_NUM_LE: return l_num <= r_num; default: break; } } else switch (cond_type) { case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0; case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0; case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0; case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0; case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0; case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0; case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0; case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0; default: break; } return FALSE; /* should not happen */ } /* Expand a named list. Return false on failure. */ static gstring * expand_listnamed(gstring * yield, const uschar * name, const uschar * listtype) { tree_node *t = NULL; const uschar * list; int sep = 0; uschar * item; uschar * suffix = US""; BOOL needsep = FALSE; #define LISTNAMED_BUF_SIZE 256 uschar b[LISTNAMED_BUF_SIZE]; uschar * buffer = b; if (*name == '+') name++; if (!listtype) /* no-argument version */ { if ( !(t = tree_search(addresslist_anchor, name)) && !(t = tree_search(domainlist_anchor, name)) && !(t = tree_search(hostlist_anchor, name))) t = tree_search(localpartlist_anchor, name); } else switch(*listtype) /* specific list-type version */ { case 'a': t = tree_search(addresslist_anchor, name); suffix = US"_a"; break; case 'd': t = tree_search(domainlist_anchor, name); suffix = US"_d"; break; case 'h': t = tree_search(hostlist_anchor, name); suffix = US"_h"; break; case 'l': t = tree_search(localpartlist_anchor, name); suffix = US"_l"; break; default: expand_string_message = US"bad suffix on \"list\" operator"; return yield; } if(!t) { expand_string_message = string_sprintf("\"%s\" is not a %snamed list", name, !listtype?"" : *listtype=='a'?"address " : *listtype=='d'?"domain " : *listtype=='h'?"host " : *listtype=='l'?"localpart " : 0); return yield; } list = ((namedlist_block *)(t->data.ptr))->string; /* The list could be quite long so we (re)use a buffer for each element rather than getting each in new memory */ if (is_tainted(list)) buffer = store_get(LISTNAMED_BUF_SIZE, TRUE); while ((item = string_nextinlist(&list, &sep, buffer, LISTNAMED_BUF_SIZE))) { uschar * buf = US" : "; if (needsep) yield = string_catn(yield, buf, 3); else needsep = TRUE; if (*item == '+') /* list item is itself a named list */ { yield = expand_listnamed(yield, item, listtype); if (expand_string_message) return yield; } else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */ { char tok[3]; tok[0] = sep; tok[1] = ':'; tok[2] = 0; for(char * cp; cp = strpbrk(CCS item, tok); item = US cp) { yield = string_catn(yield, item, cp - CS item); if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */ yield = string_catn(yield, US"::", 2); else /* sep in item; should already be doubled; emit once */ { yield = string_catn(yield, US tok, 1); if (*cp == sep) cp++; } } yield = string_cat(yield, item); } else yield = string_cat(yield, item); } return yield; } /************************************************* * Expand string * *************************************************/ /* Returns either an unchanged string, or the expanded string in stacking pool store. Interpreted sequences are: \... normal escaping rules $name substitutes the variable ${name} ditto ${op:string} operates on the expanded string value ${item{arg1}{arg2}...} expands the args and then does the business some literal args are not enclosed in {} There are now far too many operators and item types to make it worth listing them here in detail any more. We use an internal routine recursively to handle embedded substrings. The external function follows. The yield is NULL if the expansion failed, and there are two cases: if something collapsed syntactically, or if "fail" was given as the action on a lookup failure. These can be distinguished by looking at the variable expand_string_forcedfail, which is TRUE in the latter case. The skipping flag is set true when expanding a substring that isn't actually going to be used (after "if" or "lookup") and it prevents lookups from happening lower down. Store usage: At start, a store block of the length of the input plus 64 is obtained. This is expanded as necessary by string_cat(), which might have to get a new block, or might be able to expand the original. At the end of the function we can release any store above that portion of the yield block that was actually used. In many cases this will be optimal. However: if the first item in the expansion is a variable name or header name, we reset the store before processing it; if the result is in fresh store, we use that without copying. This is helpful for expanding strings like $message_headers which can get very long. There's a problem if a ${dlfunc item has side-effects that cause allocation, since resetting the store at the end of the expansion will free store that was allocated by the plugin code as well as the slop after the expanded string. So we skip any resets if ${dlfunc } has been used. The same applies for ${acl } and, given the acl condition, ${if }. This is an unfortunate consequence of string expansion becoming too powerful. Arguments: string the string to be expanded ket_ends true if expansion is to stop at } left if not NULL, a pointer to the first character after the expansion is placed here (typically used with ket_ends) skipping TRUE for recursive calls when the value isn't actually going to be used (to allow for optimisation) honour_dollar TRUE if $ is to be expanded, FALSE if it's just another character resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset the store. Returns: NULL if expansion fails: expand_string_forcedfail is set TRUE if failure was forced expand_string_message contains a textual error message a pointer to the expanded string on success */ static uschar * expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left, BOOL skipping, BOOL honour_dollar, BOOL *resetok_p) { rmark reset_point = store_mark(); gstring * yield = string_get(Ustrlen(string) + 64); int item_type; const uschar *s = string; uschar *save_expand_nstring[EXPAND_MAXN+1]; int save_expand_nlength[EXPAND_MAXN+1]; BOOL resetok = TRUE; expand_level++; DEBUG(D_expand) DEBUG(D_noutf8) debug_printf_indent("/%s: %s\n", skipping ? "---scanning" : "considering", string); else debug_printf_indent(UTF8_DOWN_RIGHT "%s: %s\n", skipping ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning" : "considering", string); f.expand_string_forcedfail = FALSE; expand_string_message = US""; if (is_tainted(string)) { expand_string_message = string_sprintf("attempt to expand tainted string '%s'", s); log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message); goto EXPAND_FAILED; } while (*s) { uschar *value; uschar name[256]; /* \ escapes the next character, which must exist, or else the expansion fails. There's a special escape, \N, which causes copying of the subject verbatim up to the next \N. Otherwise, the escapes are the standard set. */ if (*s == '\\') { if (s[1] == 0) { expand_string_message = US"\\ at end of string"; goto EXPAND_FAILED; } if (s[1] == 'N') { const uschar * t = s + 2; for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break; yield = string_catn(yield, t, s - t); if (*s != 0) s += 2; } else { uschar ch[1]; ch[0] = string_interpret_escape(&s); s++; yield = string_catn(yield, ch, 1); } continue; } /*{*/ /* Anything other than $ is just copied verbatim, unless we are looking for a terminating } character. */ /*{*/ if (ket_ends && *s == '}') break; if (*s != '$' || !honour_dollar) { yield = string_catn(yield, s++, 1); continue; } /* No { after the $ - must be a plain name or a number for string match variable. There has to be a fudge for variables that are the names of header fields preceded by "$header_" because header field names can contain any printing characters except space and colon. For those that don't like typing this much, "$h_" is a synonym for "$header_". A non-existent header yields a NULL value; nothing is inserted. */ /*}*/ if (isalpha((*(++s)))) { int len; int newsize = 0; gstring * g = NULL; uschar * t; s = read_name(name, sizeof(name), s, US"_"); /* If this is the first thing to be expanded, release the pre-allocated buffer. */ if (!yield) g = store_get(sizeof(gstring), FALSE); else if (yield->ptr == 0) { if (resetok) reset_point = store_reset(reset_point); yield = NULL; reset_point = store_mark(); g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */ } /* Header */ if ( ( *(t = name) == 'h' || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h' ) && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0) ) { unsigned flags = *name == 'r' ? FH_WANT_RAW : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST : 0; uschar * charset = *name == 'b' ? NULL : headers_charset; s = read_header_name(name, sizeof(name), s); value = find_header(name, &newsize, flags, charset); /* If we didn't find the header, and the header contains a closing brace character, this may be a user error where the terminating colon has been omitted. Set a flag to adjust the error message in this case. But there is no error here - nothing gets inserted. */ if (!value) { if (Ustrchr(name, '}')) malformed_header = TRUE; continue; } } /* Variable */ else if (!(value = find_variable(name, FALSE, skipping, &newsize))) { expand_string_message = string_sprintf("unknown variable name \"%s\"", name); check_variable_error_message(name); goto EXPAND_FAILED; } /* If the data is known to be in a new buffer, newsize will be set to the size of that buffer. If this is the first thing in an expansion string, yield will be NULL; just point it at the new store instead of copying. Many expansion strings contain just one reference, so this is a useful optimization, especially for humungous headers. We need to use a gstring structure that is not allocated after that new-buffer, else a later store reset in the middle of the buffer will make it inaccessible. */ len = Ustrlen(value); if (!yield && newsize != 0) { yield = g; yield->size = newsize; yield->ptr = len; yield->s = value; } else yield = string_catn(yield, value, len); continue; } if (isdigit(*s)) { int n; s = read_cnumber(&n, s); if (n >= 0 && n <= expand_nmax) yield = string_catn(yield, expand_nstring[n], expand_nlength[n]); continue; } /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/ if (*s != '{') /*}*/ { expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/ goto EXPAND_FAILED; } /* After { there can be various things, but they all start with an initial word, except for a number for a string match variable. */ if (isdigit((*(++s)))) { int n; s = read_cnumber(&n, s); /*{*/ if (*s++ != '}') { /*{*/ expand_string_message = US"} expected after number"; goto EXPAND_FAILED; } if (n >= 0 && n <= expand_nmax) yield = string_catn(yield, expand_nstring[n], expand_nlength[n]); continue; } if (!isalpha(*s)) { expand_string_message = US"letter or digit expected after ${"; /*}*/ goto EXPAND_FAILED; } /* Allow "-" in names to cater for substrings with negative arguments. Since we are checking for known names after { this is OK. */ s = read_name(name, sizeof(name), s, US"_-"); item_type = chop_match(name, item_table, nelem(item_table)); switch(item_type) { /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9. If the ACL returns accept or reject we return content set by "message =" There is currently no limit on recursion; this would have us call acl_check_internal() directly and get a current level from somewhere. See also the acl expansion condition ECOND_ACL and the traditional acl modifier ACLC_ACL. Assume that the function has side-effects on the store that must be preserved. */ case EITEM_ACL: /* ${acl {name} {arg1}{arg2}...} */ { uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */ uschar *user_msg; int rc; switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } if (skipping) continue; resetok = FALSE; switch(rc = eval_acl(sub, nelem(sub), &user_msg)) { case OK: case FAIL: DEBUG(D_expand) debug_printf_indent("acl expansion yield: %s\n", user_msg); if (user_msg) yield = string_cat(yield, user_msg); continue; case DEFER: f.expand_string_forcedfail = TRUE; /*FALLTHROUGH*/ default: expand_string_message = string_sprintf("%s from acl \"%s\"", rc_names[rc], sub[0]); goto EXPAND_FAILED; } } case EITEM_AUTHRESULTS: /* ${authresults {mysystemname}} */ { uschar *sub_arg[1]; switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } yield = string_append(yield, 3, US"Authentication-Results: ", sub_arg[0], US"; none"); yield->ptr -= 6; yield = authres_local(yield, sub_arg[0]); yield = authres_iprev(yield); yield = authres_smtpauth(yield); #ifdef SUPPORT_SPF yield = authres_spf(yield); #endif #ifndef DISABLE_DKIM yield = authres_dkim(yield); #endif #ifdef SUPPORT_DMARC yield = authres_dmarc(yield); #endif #ifdef EXPERIMENTAL_ARC yield = authres_arc(yield); #endif continue; } /* Handle conditionals - preserve the values of the numerical expansion variables in case they get changed by a regular expression match in the condition. If not, they retain their external settings. At the end of this "if" section, they get restored to their previous values. */ case EITEM_IF: { BOOL cond = FALSE; const uschar *next_s; int save_expand_nmax = save_expand_strings(save_expand_nstring, save_expand_nlength); Uskip_whitespace(&s); if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond))) goto EXPAND_FAILED; /* message already set */ DEBUG(D_expand) DEBUG(D_noutf8) { debug_printf_indent("|--condition: %.*s\n", (int)(next_s - s), s); debug_printf_indent("|-----result: %s\n", cond ? "true" : "false"); } else { debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ "condition: %.*s\n", (int)(next_s - s), s); debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "result: %s\n", cond ? "true" : "false"); } s = next_s; /* The handling of "yes" and "no" result strings is now in a separate function that is also used by ${lookup} and ${extract} and ${run}. */ switch(process_yesno( skipping, /* were previously skipping */ cond, /* success/failure indicator */ lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"if", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } /* Restore external setting of expansion variables for continuation at this level. */ restore_expand_strings(save_expand_nmax, save_expand_nstring, save_expand_nlength); continue; } #ifdef SUPPORT_I18N case EITEM_IMAPFOLDER: { /* ${imapfolder {name}{sep]{specials}} */ uschar *sub_arg[3]; uschar *encoded; switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } if (!sub_arg[1]) /* One argument */ { sub_arg[1] = US"/"; /* default separator */ sub_arg[2] = NULL; } else if (Ustrlen(sub_arg[1]) != 1) { expand_string_message = string_sprintf( "IMAP folder separator must be one character, found \"%s\"", sub_arg[1]); goto EXPAND_FAILED; } if (!skipping) { if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset, sub_arg[1][0], sub_arg[2], &expand_string_message))) goto EXPAND_FAILED; yield = string_cat(yield, encoded); } continue; } #endif /* Handle database lookups unless locked out. If "skipping" is TRUE, we are expanding an internal string that isn't actually going to be used. All we need to do is check the syntax, so don't do a lookup at all. Preserve the values of the numerical expansion variables in case they get changed by a partial lookup. If not, they retain their external settings. At the end of this "lookup" section, they get restored to their previous values. */ case EITEM_LOOKUP: { int stype, partial, affixlen, starflags; int expand_setup = 0; int nameptr = 0; uschar *key, *filename; const uschar * affix, * opts; uschar *save_lookup_value = lookup_value; int save_expand_nmax = save_expand_strings(save_expand_nstring, save_expand_nlength); if (expand_forbid & RDO_LOOKUP) { expand_string_message = US"lookup expansions are not permitted"; goto EXPAND_FAILED; } /* Get the key we are to look up for single-key+file style lookups. Otherwise set the key NULL pro-tem. */ if (Uskip_whitespace(&s) == '{') /*}*/ { key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); if (!key) goto EXPAND_FAILED; /*{{*/ if (*s++ != '}') { expand_string_message = US"missing '}' after lookup key"; goto EXPAND_FAILED_CURLY; } Uskip_whitespace(&s); } else key = NULL; /* Find out the type of database */ if (!isalpha(*s)) { expand_string_message = US"missing lookup type"; goto EXPAND_FAILED; } /* The type is a string that may contain special characters of various kinds. Allow everything except space or { to appear; the actual content is checked by search_findtype_partial. */ /*}*/ while (*s && *s != '{' && !isspace(*s)) /*}*/ { if (nameptr < sizeof(name) - 1) name[nameptr++] = *s; s++; } name[nameptr] = '\0'; Uskip_whitespace(&s); /* Now check for the individual search type and any partial or default options. Only those types that are actually in the binary are valid. */ if ((stype = search_findtype_partial(name, &partial, &affix, &affixlen, &starflags, &opts)) < 0) { expand_string_message = search_error_message; goto EXPAND_FAILED; } /* Check that a key was provided for those lookup types that need it, and was not supplied for those that use the query style. */ if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery)) { if (!key) { expand_string_message = string_sprintf("missing {key} for single-" "key \"%s\" lookup", name); goto EXPAND_FAILED; } } else { if (key) { expand_string_message = string_sprintf("a single key was given for " "lookup type \"%s\", which is not a single-key lookup type", name); goto EXPAND_FAILED; } } /* Get the next string in brackets and expand it. It is the file name for single-key+file lookups, and the whole query otherwise. In the case of queries that also require a file name (e.g. sqlite), the file name comes first. */ if (*s != '{') { expand_string_message = US"missing '{' for lookup file-or-query arg"; goto EXPAND_FAILED_CURLY; } if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))) goto EXPAND_FAILED; if (*s++ != '}') { expand_string_message = US"missing '}' closing lookup file-or-query arg"; goto EXPAND_FAILED_CURLY; } Uskip_whitespace(&s); /* If this isn't a single-key+file lookup, re-arrange the variables to be appropriate for the search_ functions. For query-style lookups, there is just a "key", and no file name. For the special query-style + file types, the query (i.e. "key") starts with a file name. */ if (!key) key = search_args(stype, name, filename, &filename, opts); /* If skipping, don't do the next bit - just lookup_value == NULL, as if the entry was not found. Note that there is no search_close() function. Files are left open in case of re-use. At suitable places in higher logic, search_tidyup() is called to tidy all open files. This can save opening the same file several times. However, files may also get closed when others are opened, if too many are open at once. The rule is that a handle should not be used after a second search_open(). Request that a partial search sets up $1 and maybe $2 by passing expand_setup containing zero. If its value changes, reset expand_nmax, since new variables will have been set. Note that at the end of this "lookup" section, the old numeric variables are restored. */ if (skipping) lookup_value = NULL; else { void *handle = search_open(filename, stype, 0, NULL, NULL); if (!handle) { expand_string_message = search_error_message; goto EXPAND_FAILED; } lookup_value = search_find(handle, filename, key, partial, affix, affixlen, starflags, &expand_setup, opts); if (f.search_find_defer) { expand_string_message = string_sprintf("lookup of \"%s\" gave DEFER: %s", string_printing2(key, SP_TAB), search_error_message); goto EXPAND_FAILED; } if (expand_setup > 0) expand_nmax = expand_setup; } /* The handling of "yes" and "no" result strings is now in a separate function that is also used by ${if} and ${extract}. */ switch(process_yesno( skipping, /* were previously skipping */ lookup_value != NULL, /* success/failure indicator */ save_lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"lookup", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } /* Restore external setting of expansion variables for carrying on at this level, and continue. */ restore_expand_strings(save_expand_nmax, save_expand_nstring, save_expand_nlength); continue; } /* If Perl support is configured, handle calling embedded perl subroutines, unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}} or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS arguments (defined below). */ #define EXIM_PERL_MAX_ARGS 8 case EITEM_PERL: #ifndef EXIM_PERL expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/ "is not included in this binary"; goto EXPAND_FAILED; #else /* EXIM_PERL */ { uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2]; gstring *new_yield; if ((expand_forbid & RDO_PERL) != 0) { expand_string_message = US"Perl calls are not permitted"; goto EXPAND_FAILED; } switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* If skipping, we don't actually do anything */ if (skipping) continue; /* Start the interpreter if necessary */ if (!opt_perl_started) { uschar *initerror; if (!opt_perl_startup) { expand_string_message = US"A setting of perl_startup is needed when " "using the Perl interpreter"; goto EXPAND_FAILED; } DEBUG(D_any) debug_printf("Starting Perl interpreter\n"); if ((initerror = init_perl(opt_perl_startup))) { expand_string_message = string_sprintf("error in perl_startup code: %s\n", initerror); goto EXPAND_FAILED; } opt_perl_started = TRUE; } /* Call the function */ sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL; new_yield = call_perl_cat(yield, &expand_string_message, sub_arg[0], sub_arg + 1); /* NULL yield indicates failure; if the message pointer has been set to NULL, the yield was undef, indicating a forced failure. Otherwise the message will indicate some kind of Perl error. */ if (!new_yield) { if (!expand_string_message) { expand_string_message = string_sprintf("Perl subroutine \"%s\" returned undef to force " "failure", sub_arg[0]); f.expand_string_forcedfail = TRUE; } goto EXPAND_FAILED; } /* Yield succeeded. Ensure forcedfail is unset, just in case it got set during a callback from Perl. */ f.expand_string_forcedfail = FALSE; yield = new_yield; continue; } #endif /* EXIM_PERL */ /* Transform email address to "prvs" scheme to use as BATV-signed return path */ case EITEM_PRVS: { uschar *sub_arg[3]; uschar *p,*domain; switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* If skipping, we don't actually do anything */ if (skipping) continue; /* sub_arg[0] is the address */ if ( !(domain = Ustrrchr(sub_arg[0],'@')) || domain == sub_arg[0] || Ustrlen(domain) == 1) { expand_string_message = US"prvs first argument must be a qualified email address"; goto EXPAND_FAILED; } /* Calculate the hash. The third argument must be a single-digit key number, or unset. */ if ( sub_arg[2] && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0)) { expand_string_message = US"prvs third argument must be a single digit"; goto EXPAND_FAILED; } p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7)); if (!p) { expand_string_message = US"prvs hmac-sha1 conversion failed"; goto EXPAND_FAILED; } /* Now separate the domain from the local part */ *domain++ = '\0'; yield = string_catn(yield, US"prvs=", 5); yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1); yield = string_catn(yield, prvs_daystamp(7), 3); yield = string_catn(yield, p, 6); yield = string_catn(yield, US"=", 1); yield = string_cat (yield, sub_arg[0]); yield = string_catn(yield, US"@", 1); yield = string_cat (yield, domain); continue; } /* Check a prvs-encoded address for validity */ case EITEM_PRVSCHECK: { uschar *sub_arg[3]; gstring * g; const pcre *re; uschar *p; /* TF: Ugliness: We want to expand parameter 1 first, then set up expansion variables that are used in the expansion of parameter 2. So we clone the string for the first expansion, where we only expand parameter 1. PH: Actually, that isn't necessary. The read_subs() function is designed to work this way for the ${if and ${lookup expansions. I've tidied the code. */ /* Reset expansion variables */ prvscheck_result = NULL; prvscheck_address = NULL; prvscheck_keynum = NULL; switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$", TRUE,FALSE); if (regex_match_and_setup(re,sub_arg[0],0,-1)) { uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]); uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]); uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]); uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]); uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]); DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part); DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num); DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp); DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash); DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain); /* Set up expansion variables */ g = string_cat (NULL, local_part); g = string_catn(g, US"@", 1); g = string_cat (g, domain); prvscheck_address = string_from_gstring(g); prvscheck_keynum = string_copy(key_num); /* Now expand the second argument */ switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* Now we have the key and can check the address. */ p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum, daystamp); if (!p) { expand_string_message = US"hmac-sha1 conversion failed"; goto EXPAND_FAILED; } DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash); DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p); if (Ustrcmp(p,hash) == 0) { /* Success, valid BATV address. Now check the expiry date. */ uschar *now = prvs_daystamp(0); unsigned int inow = 0,iexpire = 1; (void)sscanf(CS now,"%u",&inow); (void)sscanf(CS daystamp,"%u",&iexpire); /* When "iexpire" is < 7, a "flip" has occurred. Adjust "inow" accordingly. */ if ( (iexpire < 7) && (inow >= 993) ) inow = 0; if (iexpire >= inow) { prvscheck_result = US"1"; DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n"); } else { prvscheck_result = NULL; DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n"); } } else { prvscheck_result = NULL; DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n"); } /* Now expand the final argument. We leave this till now so that it can include $prvscheck_result. */ switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } yield = string_cat(yield, !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]); /* Reset the "internal" variables afterwards, because they are in dynamic store that will be reclaimed if the expansion succeeded. */ prvscheck_address = NULL; prvscheck_keynum = NULL; } else /* Does not look like a prvs encoded address, return the empty string. We need to make sure all subs are expanded first, so as to skip over the entire item. */ switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } continue; } /* Handle "readfile" to insert an entire file */ case EITEM_READFILE: { FILE *f; uschar *sub_arg[2]; if ((expand_forbid & RDO_READFILE) != 0) { expand_string_message = US"file insertions are not permitted"; goto EXPAND_FAILED; } switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* If skipping, we don't actually do anything */ if (skipping) continue; /* Open the file and read it */ if (!(f = Ufopen(sub_arg[0], "rb"))) { expand_string_message = string_open_failed("%s", sub_arg[0]); goto EXPAND_FAILED; } yield = cat_file(f, yield, sub_arg[1]); (void)fclose(f); continue; } /* Handle "readsocket" to insert data from a socket, either Inet or Unix domain */ case EITEM_READSOCK: { uschar * arg; uschar * sub_arg[4]; if (expand_forbid & RDO_READSOCK) { expand_string_message = US"socket insertions are not permitted"; goto EXPAND_FAILED; } /* Read up to 4 arguments, but don't do the end of item check afterwards, because there may be a string for expansion on failure. */ switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: /* Won't occur: no end check */ case 3: goto EXPAND_FAILED; } /* If skipping, we don't actually do anything. Otherwise, arrange to connect to either an IP or a Unix socket. */ if (!skipping) { int stype = search_findtype(US"readsock", 8); gstring * g = NULL; void * handle; int expand_setup = -1; uschar * s; /* If the reqstr is empty, flag that and set a dummy */ if (!sub_arg[1][0]) { g = string_append_listele(g, ',', US"send=no"); sub_arg[1] = US"DUMMY"; } /* Re-marshall the options */ if (sub_arg[2]) { const uschar * list = sub_arg[2]; uschar * item; int sep = 0; /* First option has no tag and is timeout */ if ((item = string_nextinlist(&list, &sep, NULL, 0))) g = string_append_listele(g, ',', string_sprintf("timeout=%s", item)); /* The rest of the options from the expansion */ while ((item = string_nextinlist(&list, &sep, NULL, 0))) g = string_append_listele(g, ',', item); /* possibly plus an EOL string. Process with escapes, to protect from list-processing. The only current user of eol= in search options is the readsock expansion. */ if (sub_arg[3] && *sub_arg[3]) g = string_append_listele(g, ',', string_sprintf("eol=%s", string_printing2(sub_arg[3], SP_TAB|SP_SPACE))); } /* Gat a (possibly cached) handle for the connection */ if (!(handle = search_open(sub_arg[0], stype, 0, NULL, NULL))) { if (*expand_string_message) goto EXPAND_FAILED; expand_string_message = search_error_message; search_error_message = NULL; goto SOCK_FAIL; } /* Get (possibly cached) results for the lookup */ /* sspec: sub_arg[0] req: sub_arg[1] opts: g */ if ((s = search_find(handle, sub_arg[0], sub_arg[1], -1, NULL, 0, 0, &expand_setup, string_from_gstring(g)))) yield = string_cat(yield, s); else if (f.search_find_defer) { expand_string_message = search_error_message; search_error_message = NULL; goto SOCK_FAIL; } else { /* should not happen, at present */ expand_string_message = search_error_message; search_error_message = NULL; goto SOCK_FAIL; } } /* The whole thing has worked (or we were skipping). If there is a failure string following, we need to skip it. */ if (*s == '{') { if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok)) goto EXPAND_FAILED; if (*s++ != '}') { expand_string_message = US"missing '}' closing failstring for readsocket"; goto EXPAND_FAILED_CURLY; } Uskip_whitespace(&s); } READSOCK_DONE: if (*s++ != '}') { expand_string_message = US"missing '}' closing readsocket"; goto EXPAND_FAILED_CURLY; } continue; /* Come here on failure to create socket, connect socket, write to the socket, or timeout on reading. If another substring follows, expand and use it. Otherwise, those conditions give expand errors. */ SOCK_FAIL: if (*s != '{') goto EXPAND_FAILED; DEBUG(D_any) debug_printf("%s\n", expand_string_message); if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok))) goto EXPAND_FAILED; yield = string_cat(yield, arg); if (*s++ != '}') { expand_string_message = US"missing '}' closing failstring for readsocket"; goto EXPAND_FAILED_CURLY; } Uskip_whitespace(&s); goto READSOCK_DONE; } /* Handle "run" to execute a program. */ case EITEM_RUN: { FILE *f; uschar *arg; const uschar **argv; pid_t pid; int fd_in, fd_out; if ((expand_forbid & RDO_RUN) != 0) { expand_string_message = US"running a command is not permitted"; goto EXPAND_FAILED; } Uskip_whitespace(&s); if (*s != '{') { expand_string_message = US"missing '{' for command arg of run"; goto EXPAND_FAILED_CURLY; } if (!(arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))) goto EXPAND_FAILED; Uskip_whitespace(&s); if (*s++ != '}') { expand_string_message = US"missing '}' closing command arg of run"; goto EXPAND_FAILED_CURLY; } if (skipping) /* Just pretend it worked when we're skipping */ { runrc = 0; lookup_value = NULL; } else { if (!transport_set_up_command(&argv, /* anchor for arg list */ arg, /* raw command */ FALSE, /* don't expand the arguments */ 0, /* not relevant when... */ NULL, /* no transporting address */ US"${run} expansion", /* for error messages */ &expand_string_message)) /* where to put error message */ goto EXPAND_FAILED; /* Create the child process, making it a group leader. */ if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE, US"expand-run")) < 0) { expand_string_message = string_sprintf("couldn't create child process: %s", strerror(errno)); goto EXPAND_FAILED; } /* Nothing is written to the standard input. */ (void)close(fd_in); /* Read the pipe to get the command's output into $value (which is kept in lookup_value). Read during execution, so that if the output exceeds the OS pipe buffer limit, we don't block forever. Remember to not release memory just allocated for $value. */ resetok = FALSE; f = fdopen(fd_out, "rb"); sigalrm_seen = FALSE; ALARM(60); lookup_value = string_from_gstring(cat_file(f, NULL, NULL)); ALARM_CLR(0); (void)fclose(f); /* Wait for the process to finish, applying the timeout, and inspect its return code for serious disasters. Simple non-zero returns are passed on. */ if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0) { if (sigalrm_seen || runrc == -256) { expand_string_message = US"command timed out"; killpg(pid, SIGKILL); /* Kill the whole process group */ } else if (runrc == -257) expand_string_message = string_sprintf("wait() failed: %s", strerror(errno)); else expand_string_message = string_sprintf("command killed by signal %d", -runrc); goto EXPAND_FAILED; } } /* Process the yes/no strings; $value may be useful in both cases */ switch(process_yesno( skipping, /* were previously skipping */ runrc == 0, /* success/failure indicator */ lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"run", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } continue; } /* Handle character translation for "tr" */ case EITEM_TR: { int oldptr = gstring_length(yield); int o2m; uschar *sub[3]; switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } yield = string_cat(yield, sub[0]); o2m = Ustrlen(sub[2]) - 1; if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++) { uschar *m = Ustrrchr(sub[1], yield->s[oldptr]); if (m) { int o = m - sub[1]; yield->s[oldptr] = sub[2][(o < o2m)? o : o2m]; } } continue; } /* Handle "hash", "length", "nhash", and "substr" when they are given with expanded arguments. */ case EITEM_HASH: case EITEM_LENGTH: case EITEM_NHASH: case EITEM_SUBSTR: { int len; uschar *ret; int val[2] = { 0, -1 }; uschar *sub[3]; /* "length" takes only 2 arguments whereas the others take 2 or 3. Ensure that sub[2] is set in the ${length } case. */ sub[2] = NULL; switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* Juggle the arguments if there are only two of them: always move the string to the last position and make ${length{n}{str}} equivalent to ${substr{0}{n}{str}}. See the defaults for val[] above. */ if (!sub[2]) { sub[2] = sub[1]; sub[1] = NULL; if (item_type == EITEM_LENGTH) { sub[1] = sub[0]; sub[0] = NULL; } } for (int i = 0; i < 2; i++) if (sub[i]) { val[i] = (int)Ustrtol(sub[i], &ret, 10); if (*ret != 0 || (i != 0 && val[i] < 0)) { expand_string_message = string_sprintf("\"%s\" is not a%s number " "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name); goto EXPAND_FAILED; } } ret = item_type == EITEM_HASH ? compute_hash(sub[2], val[0], val[1], &len) : item_type == EITEM_NHASH ? compute_nhash(sub[2], val[0], val[1], &len) : extract_substr(sub[2], val[0], val[1], &len); if (!ret) goto EXPAND_FAILED; yield = string_catn(yield, ret, len); continue; } /* Handle HMAC computation: ${hmac{}{}{}} This code originally contributed by Steve Haslam. It currently supports the use of MD5 and SHA-1 hashes. We need some workspace that is large enough to handle all the supported hash types. Use macros to set the sizes rather than be too elaborate. */ #define MAX_HASHLEN 20 #define MAX_HASHBLOCKLEN 64 case EITEM_HMAC: { uschar *sub[3]; md5 md5_base; hctx sha1_ctx; void *use_base; int type; int hashlen; /* Number of octets for the hash algorithm's output */ int hashblocklen; /* Number of octets the hash algorithm processes */ uschar *keyptr, *p; unsigned int keylen; uschar keyhash[MAX_HASHLEN]; uschar innerhash[MAX_HASHLEN]; uschar finalhash[MAX_HASHLEN]; uschar finalhash_hex[2*MAX_HASHLEN]; uschar innerkey[MAX_HASHBLOCKLEN]; uschar outerkey[MAX_HASHBLOCKLEN]; switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } if (!skipping) { if (Ustrcmp(sub[0], "md5") == 0) { type = HMAC_MD5; use_base = &md5_base; hashlen = 16; hashblocklen = 64; } else if (Ustrcmp(sub[0], "sha1") == 0) { type = HMAC_SHA1; use_base = &sha1_ctx; hashlen = 20; hashblocklen = 64; } else { expand_string_message = string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]); goto EXPAND_FAILED; } keyptr = sub[1]; keylen = Ustrlen(keyptr); /* If the key is longer than the hash block length, then hash the key first */ if (keylen > hashblocklen) { chash_start(type, use_base); chash_end(type, use_base, keyptr, keylen, keyhash); keyptr = keyhash; keylen = hashlen; } /* Now make the inner and outer key values */ memset(innerkey, 0x36, hashblocklen); memset(outerkey, 0x5c, hashblocklen); for (int i = 0; i < keylen; i++) { innerkey[i] ^= keyptr[i]; outerkey[i] ^= keyptr[i]; } /* Now do the hashes */ chash_start(type, use_base); chash_mid(type, use_base, innerkey); chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash); chash_start(type, use_base); chash_mid(type, use_base, outerkey); chash_end(type, use_base, innerhash, hashlen, finalhash); /* Encode the final hash as a hex string */ p = finalhash_hex; for (int i = 0; i < hashlen; i++) { *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; *p++ = hex_digits[finalhash[i] & 0x0f]; } DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n", sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex); yield = string_catn(yield, finalhash_hex, hashlen*2); } continue; } /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator. We have to save the numerical variables and restore them afterwards. */ case EITEM_SG: { const pcre *re; int moffset, moffsetextra, slen; int roffset; int emptyopt; const uschar *rerror; uschar *subject; uschar *sub[3]; int save_expand_nmax = save_expand_strings(save_expand_nstring, save_expand_nlength); switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* Compile the regular expression */ if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror, &roffset, NULL))) { expand_string_message = string_sprintf("regular expression error in " "\"%s\": %s at offset %d", sub[1], rerror, roffset); goto EXPAND_FAILED; } /* Now run a loop to do the substitutions as often as necessary. It ends when there are no more matches. Take care over matches of the null string; do the same thing as Perl does. */ subject = sub[0]; slen = Ustrlen(sub[0]); moffset = moffsetextra = 0; emptyopt = 0; for (;;) { int ovector[3*(EXPAND_MAXN+1)]; int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra, PCRE_EOPT | emptyopt, ovector, nelem(ovector)); uschar *insert; /* No match - if we previously set PCRE_NOTEMPTY after a null match, this is not necessarily the end. We want to repeat the match from one character further along, but leaving the basic offset the same (for copying below). We can't be at the end of the string - that was checked before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are finished; copy the remaining string and end the loop. */ if (n < 0) { if (emptyopt != 0) { moffsetextra = 1; emptyopt = 0; continue; } yield = string_catn(yield, subject+moffset, slen-moffset); break; } /* Match - set up for expanding the replacement. */ if (n == 0) n = EXPAND_MAXN + 1; expand_nmax = 0; for (int nn = 0; nn < n*2; nn += 2) { expand_nstring[expand_nmax] = subject + ovector[nn]; expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; } expand_nmax--; /* Copy the characters before the match, plus the expanded insertion. */ yield = string_catn(yield, subject + moffset, ovector[0] - moffset); if (!(insert = expand_string(sub[2]))) goto EXPAND_FAILED; yield = string_cat(yield, insert); moffset = ovector[1]; moffsetextra = 0; emptyopt = 0; /* If we have matched an empty string, first check to see if we are at the end of the subject. If so, the loop is over. Otherwise, mimic what Perl's /g options does. This turns out to be rather cunning. First we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty string at the same point. If this fails (picked up above) we advance to the next character. */ if (ovector[0] == ovector[1]) { if (ovector[0] == slen) break; emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED; } } /* All done - restore numerical variables. */ restore_expand_strings(save_expand_nmax, save_expand_nstring, save_expand_nlength); continue; } /* Handle keyed and numbered substring extraction. If the first argument consists entirely of digits, then a numerical extraction is assumed. */ case EITEM_EXTRACT: { int field_number = 1; BOOL field_number_set = FALSE; uschar *save_lookup_value = lookup_value; uschar *sub[3]; int save_expand_nmax = save_expand_strings(save_expand_nstring, save_expand_nlength); /* On reflection the original behaviour of extract-json for a string result, leaving it quoted, was a mistake. But it was already published, hence the addition of jsons. In a future major version, make json work like josons, and withdraw jsons. */ enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic; /* Check for a format-variant specifier */ if (Uskip_whitespace(&s) != '{') /*}*/ if (Ustrncmp(s, "json", 4) == 0) if (*(s += 4) == 's') {fmt = extract_jsons; s++;} else fmt = extract_json; /* While skipping we cannot rely on the data for expansions being available (eg. $item) hence cannot decide on numeric vs. keyed. Read a maximum of 5 arguments (including the yes/no) */ if (skipping) { for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/ { if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)) goto EXPAND_FAILED; /*'{'*/ if (*s++ != '}') { expand_string_message = US"missing '{' for arg of extract"; goto EXPAND_FAILED_CURLY; } Uskip_whitespace(&s); } if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/ && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4]) ) { s += 4; Uskip_whitespace(&s); } /*'{'*/ if (*s != '}') { expand_string_message = US"missing '}' closing extract"; goto EXPAND_FAILED_CURLY; } } else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */ { if (Uskip_whitespace(&s) == '{') /*'}'*/ { if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))) goto EXPAND_FAILED; /*'{'*/ if (*s++ != '}') { expand_string_message = string_sprintf( "missing '}' closing arg %d of extract", i+1); goto EXPAND_FAILED_CURLY; } /* After removal of leading and trailing white space, the first argument must not be empty; if it consists entirely of digits (optionally preceded by a minus sign), this is a numerical extraction, and we expect 3 arguments (normal) or 2 (json). */ if (i == 0) { int len; int x = 0; uschar *p = sub[0]; Uskip_whitespace(&p); sub[0] = p; len = Ustrlen(p); while (len > 0 && isspace(p[len-1])) len--; p[len] = 0; if (*p == 0) { expand_string_message = US"first argument of \"extract\" must " "not be empty"; goto EXPAND_FAILED; } if (*p == '-') { field_number = -1; p++; } while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0'; if (*p == 0) { field_number *= x; if (fmt == extract_basic) j = 3; /* Need 3 args */ field_number_set = TRUE; } } } else { expand_string_message = string_sprintf( "missing '{' for arg %d of extract", i+1); goto EXPAND_FAILED_CURLY; } } /* Extract either the numbered or the keyed substring into $value. If skipping, just pretend the extraction failed. */ if (skipping) lookup_value = NULL; else switch (fmt) { case extract_basic: lookup_value = field_number_set ? expand_gettokened(field_number, sub[1], sub[2]) : expand_getkeyed(sub[0], sub[1]); break; case extract_json: case extract_jsons: { uschar * s, * item; const uschar * list; /* Array: Bracket-enclosed and comma-separated. Object: Brace-enclosed, comma-sep list of name:value pairs */ if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}"))) { expand_string_message = string_sprintf("%s wrapping %s for extract json", expand_string_message, field_number_set ? "array" : "object"); goto EXPAND_FAILED_CURLY; } list = s; if (field_number_set) { if (field_number <= 0) { expand_string_message = US"first argument of \"extract\" must " "be greater than zero"; goto EXPAND_FAILED; } while (field_number > 0 && (item = json_nextinlist(&list))) field_number--; if ((lookup_value = s = item)) { while (*s) s++; while (--s >= lookup_value && isspace(*s)) *s = '\0'; } } else { lookup_value = NULL; while ((item = json_nextinlist(&list))) { /* Item is: string name-sep value. string is quoted. Dequote the string and compare with the search key. */ if (!(item = dewrap(item, US"\"\""))) { expand_string_message = string_sprintf("%s wrapping string key for extract json", expand_string_message); goto EXPAND_FAILED_CURLY; } if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */ { s = item + Ustrlen(item) + 1; if (Uskip_whitespace(&s) != ':') { expand_string_message = US"missing object value-separator for extract json"; goto EXPAND_FAILED_CURLY; } s++; Uskip_whitespace(&s); lookup_value = s; break; } } } } if ( fmt == extract_jsons && lookup_value && !(lookup_value = dewrap(lookup_value, US"\"\""))) { expand_string_message = string_sprintf("%s wrapping string result for extract jsons", expand_string_message); goto EXPAND_FAILED_CURLY; } break; /* json/s */ } /* If no string follows, $value gets substituted; otherwise there can be yes/no strings, as for lookup or if. */ switch(process_yesno( skipping, /* were previously skipping */ lookup_value != NULL, /* success/failure indicator */ save_lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"extract", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } /* All done - restore numerical variables. */ restore_expand_strings(save_expand_nmax, save_expand_nstring, save_expand_nlength); continue; } /* return the Nth item from a list */ case EITEM_LISTEXTRACT: { int field_number = 1; uschar *save_lookup_value = lookup_value; uschar *sub[2]; int save_expand_nmax = save_expand_strings(save_expand_nstring, save_expand_nlength); /* Read the field & list arguments */ for (int i = 0; i < 2; i++) { if (Uskip_whitespace(&s) != '{') /*'}'*/ { expand_string_message = string_sprintf( "missing '{' for arg %d of listextract", i+1); goto EXPAND_FAILED_CURLY; } sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); if (!sub[i]) goto EXPAND_FAILED; /*{*/ if (*s++ != '}') { expand_string_message = string_sprintf( "missing '}' closing arg %d of listextract", i+1); goto EXPAND_FAILED_CURLY; } /* After removal of leading and trailing white space, the first argument must be numeric and nonempty. */ if (i == 0) { int len; int x = 0; uschar *p = sub[0]; Uskip_whitespace(&p); sub[0] = p; len = Ustrlen(p); while (len > 0 && isspace(p[len-1])) len--; p[len] = 0; if (!*p && !skipping) { expand_string_message = US"first argument of \"listextract\" must " "not be empty"; goto EXPAND_FAILED; } if (*p == '-') { field_number = -1; p++; } while (*p && isdigit(*p)) x = x * 10 + *p++ - '0'; if (*p) { expand_string_message = US"first argument of \"listextract\" must " "be numeric"; goto EXPAND_FAILED; } field_number *= x; } } /* Extract the numbered element into $value. If skipping, just pretend the extraction failed. */ lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]); /* If no string follows, $value gets substituted; otherwise there can be yes/no strings, as for lookup or if. */ switch(process_yesno( skipping, /* were previously skipping */ lookup_value != NULL, /* success/failure indicator */ save_lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"listextract", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } /* All done - restore numerical variables. */ restore_expand_strings(save_expand_nmax, save_expand_nstring, save_expand_nlength); continue; } case EITEM_LISTQUOTE: { uschar * sub[2]; switch(read_subs(sub, 2, 2, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } if (*sub[1]) for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++) { if (c == sep) yield = string_catn(yield, sub[1], 1); yield = string_catn(yield, sub[1], 1); } else yield = string_catn(yield, US" ", 1); continue; } #ifndef DISABLE_TLS case EITEM_CERTEXTRACT: { uschar *save_lookup_value = lookup_value; uschar *sub[2]; int save_expand_nmax = save_expand_strings(save_expand_nstring, save_expand_nlength); /* Read the field argument */ if (Uskip_whitespace(&s) != '{') /*}*/ { expand_string_message = US"missing '{' for field arg of certextract"; goto EXPAND_FAILED_CURLY; } sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); if (!sub[0]) goto EXPAND_FAILED; /*{*/ if (*s++ != '}') { expand_string_message = US"missing '}' closing field arg of certextract"; goto EXPAND_FAILED_CURLY; } /* strip spaces fore & aft */ { int len; uschar *p = sub[0]; Uskip_whitespace(&p); sub[0] = p; len = Ustrlen(p); while (len > 0 && isspace(p[len-1])) len--; p[len] = 0; } /* inspect the cert argument */ if (Uskip_whitespace(&s) != '{') /*}*/ { expand_string_message = US"missing '{' for cert variable arg of certextract"; goto EXPAND_FAILED_CURLY; } if (*++s != '$') { expand_string_message = US"second argument of \"certextract\" must " "be a certificate variable"; goto EXPAND_FAILED; } sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok); if (!sub[1]) goto EXPAND_FAILED; /*{*/ if (*s++ != '}') { expand_string_message = US"missing '}' closing cert variable arg of certextract"; goto EXPAND_FAILED_CURLY; } if (skipping) lookup_value = NULL; else { lookup_value = expand_getcertele(sub[0], sub[1]); if (*expand_string_message) goto EXPAND_FAILED; } switch(process_yesno( skipping, /* were previously skipping */ lookup_value != NULL, /* success/failure indicator */ save_lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"certextract", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } restore_expand_strings(save_expand_nmax, save_expand_nstring, save_expand_nlength); continue; } #endif /*DISABLE_TLS*/ /* Handle list operations */ case EITEM_FILTER: case EITEM_MAP: case EITEM_REDUCE: { int sep = 0; int save_ptr = gstring_length(yield); uschar outsep[2] = { '\0', '\0' }; const uschar *list, *expr, *temp; uschar *save_iterate_item = iterate_item; uschar *save_lookup_value = lookup_value; Uskip_whitespace(&s); if (*s++ != '{') { expand_string_message = string_sprintf("missing '{' for first arg of %s", name); goto EXPAND_FAILED_CURLY; } if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok))) goto EXPAND_FAILED; if (*s++ != '}') { expand_string_message = string_sprintf("missing '}' closing first arg of %s", name); goto EXPAND_FAILED_CURLY; } if (item_type == EITEM_REDUCE) { uschar * t; Uskip_whitespace(&s); if (*s++ != '{') { expand_string_message = US"missing '{' for second arg of reduce"; goto EXPAND_FAILED_CURLY; } t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok); if (!t) goto EXPAND_FAILED; lookup_value = t; if (*s++ != '}') { expand_string_message = US"missing '}' closing second arg of reduce"; goto EXPAND_FAILED_CURLY; } } Uskip_whitespace(&s); if (*s++ != '{') { expand_string_message = string_sprintf("missing '{' for last arg of %s", name); goto EXPAND_FAILED_CURLY; } expr = s; /* For EITEM_FILTER, call eval_condition once, with result discarded (as if scanning a "false" part). This allows us to find the end of the condition, because if the list is empty, we won't actually evaluate the condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using the normal internal expansion function. */ if (item_type == EITEM_FILTER) { if ((temp = eval_condition(expr, &resetok, NULL))) s = temp; } else temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok); if (!temp) { expand_string_message = string_sprintf("%s inside \"%s\" item", expand_string_message, name); goto EXPAND_FAILED; } Uskip_whitespace(&s); if (*s++ != '}') { /*{*/ expand_string_message = string_sprintf("missing } at end of condition " "or expression inside \"%s\"; could be an unquoted } in the content", name); goto EXPAND_FAILED; } Uskip_whitespace(&s); /*{*/ if (*s++ != '}') { /*{*/ expand_string_message = string_sprintf("missing } at end of \"%s\"", name); goto EXPAND_FAILED; } /* If we are skipping, we can now just move on to the next item. When processing for real, we perform the iteration. */ if (skipping) continue; while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0))) { *outsep = (uschar)sep; /* Separator as a string */ DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n", name, iterate_item, lookup_value); if (item_type == EITEM_FILTER) { BOOL condresult; if (!eval_condition(expr, &resetok, &condresult)) { iterate_item = save_iterate_item; lookup_value = save_lookup_value; expand_string_message = string_sprintf("%s inside \"%s\" condition", expand_string_message, name); goto EXPAND_FAILED; } DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name, condresult? "true":"false"); if (condresult) temp = iterate_item; /* TRUE => include this item */ else continue; /* FALSE => skip this item */ } /* EITEM_MAP and EITEM_REDUCE */ else { uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok); temp = t; if (!temp) { iterate_item = save_iterate_item; expand_string_message = string_sprintf("%s inside \"%s\" item", expand_string_message, name); goto EXPAND_FAILED; } if (item_type == EITEM_REDUCE) { lookup_value = t; /* Update the value of $value */ continue; /* and continue the iteration */ } } /* We reach here for FILTER if the condition is true, always for MAP, and never for REDUCE. The value in "temp" is to be added to the output list that is being created, ensuring that any occurrences of the separator character are doubled. Unless we are dealing with the first item of the output list, add in a space if the new item begins with the separator character, or is an empty string. */ if ( yield && yield->ptr != save_ptr && (temp[0] == *outsep || temp[0] == 0)) yield = string_catn(yield, US" ", 1); /* Add the string in "temp" to the output list that we are building, This is done in chunks by searching for the separator character. */ for (;;) { size_t seglen = Ustrcspn(temp, outsep); yield = string_catn(yield, temp, seglen + 1); /* If we got to the end of the string we output one character too many; backup and end the loop. Otherwise arrange to double the separator. */ if (temp[seglen] == '\0') { yield->ptr--; break; } yield = string_catn(yield, outsep, 1); temp += seglen + 1; } /* Output a separator after the string: we will remove the redundant final one at the end. */ yield = string_catn(yield, outsep, 1); } /* End of iteration over the list loop */ /* REDUCE has generated no output above: output the final value of $value. */ if (item_type == EITEM_REDUCE) { yield = string_cat(yield, lookup_value); lookup_value = save_lookup_value; /* Restore $value */ } /* FILTER and MAP generate lists: if they have generated anything, remove the redundant final separator. Even though an empty item at the end of a list does not count, this is tidier. */ else if (yield && yield->ptr != save_ptr) yield->ptr--; /* Restore preserved $item */ iterate_item = save_iterate_item; continue; } case EITEM_SORT: { int cond_type; int sep = 0; const uschar *srclist, *cmp, *xtract; uschar * opname, * srcitem; const uschar *dstlist = NULL, *dstkeylist = NULL; uschar * tmp; uschar *save_iterate_item = iterate_item; Uskip_whitespace(&s); if (*s++ != '{') { expand_string_message = US"missing '{' for list arg of sort"; goto EXPAND_FAILED_CURLY; } srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok); if (!srclist) goto EXPAND_FAILED; if (*s++ != '}') { expand_string_message = US"missing '}' closing list arg of sort"; goto EXPAND_FAILED_CURLY; } Uskip_whitespace(&s); if (*s++ != '{') { expand_string_message = US"missing '{' for comparator arg of sort"; goto EXPAND_FAILED_CURLY; } cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok); if (!cmp) goto EXPAND_FAILED; if (*s++ != '}') { expand_string_message = US"missing '}' closing comparator arg of sort"; goto EXPAND_FAILED_CURLY; } if ((cond_type = identify_operator(&cmp, &opname)) == -1) { if (!expand_string_message) expand_string_message = string_sprintf("unknown condition \"%s\"", s); goto EXPAND_FAILED; } switch(cond_type) { case ECOND_NUM_L: case ECOND_NUM_LE: case ECOND_NUM_G: case ECOND_NUM_GE: case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI: case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI: break; default: expand_string_message = US"comparator not handled for sort"; goto EXPAND_FAILED; } Uskip_whitespace(&s); if (*s++ != '{') { expand_string_message = US"missing '{' for extractor arg of sort"; goto EXPAND_FAILED_CURLY; } xtract = s; if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok))) goto EXPAND_FAILED; xtract = string_copyn(xtract, s - xtract); if (*s++ != '}') { expand_string_message = US"missing '}' closing extractor arg of sort"; goto EXPAND_FAILED_CURLY; } /*{*/ if (*s++ != '}') { /*{*/ expand_string_message = US"missing } at end of \"sort\""; goto EXPAND_FAILED; } if (skipping) continue; while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0))) { uschar * srcfield, * dstitem; gstring * newlist = NULL; gstring * newkeylist = NULL; DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem); /* extract field for comparisons */ iterate_item = srcitem; if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE, TRUE, &resetok)) || !*srcfield) { expand_string_message = string_sprintf( "field-extract in sort: \"%s\"", xtract); goto EXPAND_FAILED; } /* Insertion sort */ /* copy output list until new-item < list-item */ while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0))) { uschar * dstfield; /* field for comparison */ if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0))) goto sort_mismatch; /* String-comparator names start with a letter; numeric names do not */ if (sortsbefore(cond_type, isalpha(opname[0]), srcfield, dstfield)) { /* New-item sorts before this dst-item. Append new-item, then dst-item, then remainder of dst list. */ newlist = string_append_listele(newlist, sep, srcitem); newkeylist = string_append_listele(newkeylist, sep, srcfield); srcitem = NULL; newlist = string_append_listele(newlist, sep, dstitem); newkeylist = string_append_listele(newkeylist, sep, dstfield); /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */ while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0))) { if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0))) goto sort_mismatch; newlist = string_append_listele(newlist, sep, dstitem); newkeylist = string_append_listele(newkeylist, sep, dstfield); } break; } newlist = string_append_listele(newlist, sep, dstitem); newkeylist = string_append_listele(newkeylist, sep, dstfield); } /* If we ran out of dstlist without consuming srcitem, append it */ if (srcitem) { newlist = string_append_listele(newlist, sep, srcitem); newkeylist = string_append_listele(newkeylist, sep, srcfield); } dstlist = newlist->s; dstkeylist = newkeylist->s; DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist); DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist); } if (dstlist) yield = string_cat(yield, dstlist); /* Restore preserved $item */ iterate_item = save_iterate_item; continue; sort_mismatch: expand_string_message = US"Internal error in sort (list mismatch)"; goto EXPAND_FAILED; } /* If ${dlfunc } support is configured, handle calling dynamically-loaded functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}} or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */ #define EXPAND_DLFUNC_MAX_ARGS 8 case EITEM_DLFUNC: #ifndef EXPAND_DLFUNC expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/ "is not included in this binary"; goto EXPAND_FAILED; #else /* EXPAND_DLFUNC */ { tree_node *t; exim_dlfunc_t *func; uschar *result; int status, argc; uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3]; if ((expand_forbid & RDO_DLFUNC) != 0) { expand_string_message = US"dynamically-loaded functions are not permitted"; goto EXPAND_FAILED; } switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } /* If skipping, we don't actually do anything */ if (skipping) continue; /* Look up the dynamically loaded object handle in the tree. If it isn't found, dlopen() the file and put the handle in the tree for next time. */ if (!(t = tree_search(dlobj_anchor, argv[0]))) { void *handle = dlopen(CS argv[0], RTLD_LAZY); if (!handle) { expand_string_message = string_sprintf("dlopen \"%s\" failed: %s", argv[0], dlerror()); log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message); goto EXPAND_FAILED; } t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), is_tainted(argv[0])); Ustrcpy(t->name, argv[0]); t->data.ptr = handle; (void)tree_insertnode(&dlobj_anchor, t); } /* Having obtained the dynamically loaded object handle, look up the function pointer. */ if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1]))) { expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: " "%s", argv[1], argv[0], dlerror()); log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message); goto EXPAND_FAILED; } /* Call the function and work out what to do with the result. If it returns OK, we have a replacement string; if it returns DEFER then expansion has failed in a non-forced manner; if it returns FAIL then failure was forced; if it returns ERROR or any other value there's a problem, so panic slightly. In any case, assume that the function has side-effects on the store that must be preserved. */ resetok = FALSE; result = NULL; for (argc = 0; argv[argc]; argc++); status = func(&result, argc - 2, &argv[2]); if(status == OK) { if (!result) result = US""; yield = string_cat(yield, result); continue; } else { expand_string_message = result ? result : US"(no message)"; if (status == FAIL_FORCED) f.expand_string_forcedfail = TRUE; else if (status != FAIL) log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s", argv[0], argv[1], status, expand_string_message); goto EXPAND_FAILED; } } #endif /* EXPAND_DLFUNC */ case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */ { uschar * key; uschar *save_lookup_value = lookup_value; if (Uskip_whitespace(&s) != '{') /*}*/ goto EXPAND_FAILED; key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); if (!key) goto EXPAND_FAILED; /*{*/ if (*s++ != '}') { expand_string_message = US"missing '{' for name arg of env"; goto EXPAND_FAILED_CURLY; } lookup_value = US getenv(CS key); switch(process_yesno( skipping, /* were previously skipping */ lookup_value != NULL, /* success/failure indicator */ save_lookup_value, /* value to reset for string2 */ &s, /* input pointer */ &yield, /* output pointer */ US"env", /* condition type */ &resetok)) { case 1: goto EXPAND_FAILED; /* when all is well, the */ case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ } continue; } #ifdef SUPPORT_SRS case EITEM_SRS_ENCODE: /* ${srs_encode {secret} {return_path} {orig_domain}} */ { uschar * sub[3]; uschar cksum[4]; gstring * g = NULL; BOOL quoted = FALSE; switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok)) { case 1: goto EXPAND_FAILED_CURLY; case 2: case 3: goto EXPAND_FAILED; } g = string_catn(g, US"SRS0=", 5); /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */ hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum)); g = string_catn(g, cksum, sizeof(cksum)); g = string_catn(g, US"=", 1); /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */ { struct timeval now; unsigned long i; gstring * h = NULL; gettimeofday(&now, NULL); for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5) h = string_catn(h, &base32_chars[i & 0x1f], 1); if (h) while (h->ptr > 0) g = string_catn(g, &h->s[--h->ptr], 1); } g = string_catn(g, US"=", 1); /* ${domain:$return_path}=${local_part:$return_path} */ { int start, end, domain; uschar * t = parse_extract_address(sub[1], &expand_string_message, &start, &end, &domain, FALSE); uschar * s; if (!t) goto EXPAND_FAILED; if (domain > 0) g = string_cat(g, t + domain); g = string_catn(g, US"=", 1); s = domain > 0 ? string_copyn(t, domain - 1) : t; if ((quoted = Ustrchr(s, '"') != NULL)) { gstring * h = NULL; DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n"); while (*s) /* de-quote */ { while (*s && *s != '"') h = string_catn(h, s++, 1); if (*s) s++; while (*s && *s != '"') h = string_catn(h, s++, 1); if (*s) s++; } gstring_release_unused(h); s = string_from_gstring(h); } g = string_cat(g, s); } /* Assume that if the original local_part had quotes it was for good reason */ if (quoted) yield = string_catn(yield, US"\"", 1); yield = string_catn(yield, g->s, g->ptr); if (quoted) yield = string_catn(yield, US"\"", 1); /* @$original_domain */ yield = string_catn(yield, US"@", 1); yield = string_cat(yield, sub[2]); continue; } #endif /*SUPPORT_SRS*/ } /* EITEM_* switch */ /* Control reaches here if the name is not recognized as one of the more complicated expansion items. Check for the "operator" syntax (name terminated by a colon). Some of the operators have arguments, separated by _ from the name. */ if (*s == ':') { int c; uschar *arg = NULL; uschar *sub; #ifndef DISABLE_TLS var_entry *vp = NULL; #endif /* Owing to an historical mis-design, an underscore may be part of the operator name, or it may introduce arguments. We therefore first scan the table of names that contain underscores. If there is no match, we cut off the arguments and then scan the main table. */ if ((c = chop_match(name, op_table_underscore, nelem(op_table_underscore))) < 0) { if ((arg = Ustrchr(name, '_'))) *arg = 0; if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0) c += nelem(op_table_underscore); if (arg) *arg++ = '_'; /* Put back for error messages */ } /* Deal specially with operators that might take a certificate variable as we do not want to do the usual expansion. For most, expand the string.*/ switch(c) { #ifndef DISABLE_TLS case EOP_MD5: case EOP_SHA1: case EOP_SHA256: case EOP_BASE64: if (s[1] == '$') { const uschar * s1 = s; sub = expand_string_internal(s+2, TRUE, &s1, skipping, FALSE, &resetok); if (!sub) goto EXPAND_FAILED; /*{*/ if (*s1 != '}') { expand_string_message = string_sprintf("missing '}' closing cert arg of %s", name); goto EXPAND_FAILED_CURLY; } if ((vp = find_var_ent(sub)) && vp->type == vtype_cert) { s = s1+1; break; } vp = NULL; } /*FALLTHROUGH*/ #endif default: sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); if (!sub) goto EXPAND_FAILED; s++; break; } /* If we are skipping, we don't need to perform the operation at all. This matters for operations like "mask", because the data may not be in the correct format when skipping. For example, the expression may test for the existence of $sender_host_address before trying to mask it. For other operations, doing them may not fail, but it is a waste of time. */ if (skipping && c >= 0) continue; /* Otherwise, switch on the operator type */ switch(c) { case EOP_BASE32: { uschar *t; unsigned long int n = Ustrtoul(sub, &t, 10); gstring * g = NULL; if (*t != 0) { expand_string_message = string_sprintf("argument for base32 " "operator is \"%s\", which is not a decimal number", sub); goto EXPAND_FAILED; } for ( ; n; n >>= 5) g = string_catn(g, &base32_chars[n & 0x1f], 1); if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1); continue; } case EOP_BASE32D: { uschar *tt = sub; unsigned long int n = 0; while (*tt) { uschar * t = Ustrchr(base32_chars, *tt++); if (!t) { expand_string_message = string_sprintf("argument for base32d " "operator is \"%s\", which is not a base 32 number", sub); goto EXPAND_FAILED; } n = n * 32 + (t - base32_chars); } yield = string_fmt_append(yield, "%ld", n); continue; } case EOP_BASE62: { uschar *t; unsigned long int n = Ustrtoul(sub, &t, 10); if (*t != 0) { expand_string_message = string_sprintf("argument for base62 " "operator is \"%s\", which is not a decimal number", sub); goto EXPAND_FAILED; } yield = string_cat(yield, string_base62(n)); continue; } /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */ case EOP_BASE62D: { uschar *tt = sub; unsigned long int n = 0; while (*tt != 0) { uschar *t = Ustrchr(base62_chars, *tt++); if (!t) { expand_string_message = string_sprintf("argument for base62d " "operator is \"%s\", which is not a base %d number", sub, BASE_62); goto EXPAND_FAILED; } n = n * BASE_62 + (t - base62_chars); } yield = string_fmt_append(yield, "%ld", n); continue; } case EOP_BLESS: /* This is purely for the convenience of the test harness. Do not enable it otherwise as it defeats the taint-checking security. */ if (f.running_in_test_harness) yield = string_cat(yield, is_tainted(sub) ? string_copy_taint(sub, FALSE) : sub); else { DEBUG(D_expand) debug_printf_indent("bless operator not supported\n"); yield = string_cat(yield, sub); } continue; case EOP_EXPAND: { uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok); if (!expanded) { expand_string_message = string_sprintf("internal expansion of \"%s\" failed: %s", sub, expand_string_message); goto EXPAND_FAILED; } yield = string_cat(yield, expanded); continue; } case EOP_LC: { int count = 0; uschar *t = sub - 1; while (*(++t) != 0) { *t = tolower(*t); count++; } yield = string_catn(yield, sub, count); continue; } case EOP_UC: { int count = 0; uschar *t = sub - 1; while (*(++t) != 0) { *t = toupper(*t); count++; } yield = string_catn(yield, sub, count); continue; } case EOP_MD5: #ifndef DISABLE_TLS if (vp && *(void **)vp->value) { uschar * cp = tls_cert_fprt_md5(*(void **)vp->value); yield = string_cat(yield, cp); } else #endif { md5 base; uschar digest[16]; md5_start(&base); md5_end(&base, sub, Ustrlen(sub), digest); for (int j = 0; j < 16; j++) yield = string_fmt_append(yield, "%02x", digest[j]); } continue; case EOP_SHA1: #ifndef DISABLE_TLS if (vp && *(void **)vp->value) { uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value); yield = string_cat(yield, cp); } else #endif { hctx h; uschar digest[20]; sha1_start(&h); sha1_end(&h, sub, Ustrlen(sub), digest); for (int j = 0; j < 20; j++) yield = string_fmt_append(yield, "%02X", digest[j]); } continue; case EOP_SHA2: case EOP_SHA256: #ifdef EXIM_HAVE_SHA2 if (vp && *(void **)vp->value) if (c == EOP_SHA256) yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value)); else expand_string_message = US"sha2_N not supported with certificates"; else { hctx h; blob b; hashmethod m = !arg ? HASH_SHA2_256 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512 : HASH_BADTYPE; if (m == HASH_BADTYPE || !exim_sha_init(&h, m)) { expand_string_message = US"unrecognised sha2 variant"; goto EXPAND_FAILED; } exim_sha_update(&h, sub, Ustrlen(sub)); exim_sha_finish(&h, &b); while (b.len-- > 0) yield = string_fmt_append(yield, "%02X", *b.data++); } #else expand_string_message = US"sha256 only supported with TLS"; #endif continue; case EOP_SHA3: #ifdef EXIM_HAVE_SHA3 { hctx h; blob b; hashmethod m = !arg ? HASH_SHA3_256 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512 : HASH_BADTYPE; if (m == HASH_BADTYPE || !exim_sha_init(&h, m)) { expand_string_message = US"unrecognised sha3 variant"; goto EXPAND_FAILED; } exim_sha_update(&h, sub, Ustrlen(sub)); exim_sha_finish(&h, &b); while (b.len-- > 0) yield = string_fmt_append(yield, "%02X", *b.data++); } continue; #else expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +"; goto EXPAND_FAILED; #endif /* Convert hex encoding to base64 encoding */ case EOP_HEX2B64: { int c = 0; int b = -1; uschar *in = sub; uschar *out = sub; uschar *enc; for (enc = sub; *enc; enc++) { if (!isxdigit(*enc)) { expand_string_message = string_sprintf("\"%s\" is not a hex " "string", sub); goto EXPAND_FAILED; } c++; } if ((c & 1) != 0) { expand_string_message = string_sprintf("\"%s\" contains an odd " "number of characters", sub); goto EXPAND_FAILED; } while ((c = *in++) != 0) { if (isdigit(c)) c -= '0'; else c = toupper(c) - 'A' + 10; if (b == -1) b = c << 4; else { *out++ = b | c; b = -1; } } enc = b64encode(CUS sub, out - sub); yield = string_cat(yield, enc); continue; } /* Convert octets outside 0x21..0x7E to \xXX form */ case EOP_HEXQUOTE: { uschar *t = sub - 1; while (*(++t) != 0) { if (*t < 0x21 || 0x7E < *t) yield = string_fmt_append(yield, "\\x%02x", *t); else yield = string_catn(yield, t, 1); } continue; } /* count the number of list elements */ case EOP_LISTCOUNT: { int cnt = 0, sep = 0; uschar * buf = store_get(2, is_tainted(sub)); while (string_nextinlist(CUSS &sub, &sep, buf, 1)) cnt++; yield = string_fmt_append(yield, "%d", cnt); continue; } /* expand a named list given the name */ /* handles nested named lists; requotes as colon-sep list */ case EOP_LISTNAMED: expand_string_message = NULL; yield = expand_listnamed(yield, sub, arg); if (expand_string_message) goto EXPAND_FAILED; continue; /* quote a list-item for the given list-separator */ /* mask applies a mask to an IP address; for example the result of ${mask:131.111.10.206/28} is 131.111.10.192/28. */ case EOP_MASK: { int count; uschar *endptr; int binary[4]; int mask, maskoffset; int type = string_is_ip_address(sub, &maskoffset); uschar buffer[64]; if (type == 0) { expand_string_message = string_sprintf("\"%s\" is not an IP address", sub); goto EXPAND_FAILED; } if (maskoffset == 0) { expand_string_message = string_sprintf("missing mask value in \"%s\"", sub); goto EXPAND_FAILED; } mask = Ustrtol(sub + maskoffset + 1, &endptr, 10); if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128)) { expand_string_message = string_sprintf("mask value too big in \"%s\"", sub); goto EXPAND_FAILED; } /* Convert the address to binary integer(s) and apply the mask */ sub[maskoffset] = 0; count = host_aton(sub, binary); host_mask(count, binary, mask); /* Convert to masked textual format and add to output. */ yield = string_catn(yield, buffer, host_nmtoa(count, binary, mask, buffer, '.')); continue; } case EOP_IPV6NORM: case EOP_IPV6DENORM: { int type = string_is_ip_address(sub, NULL); int binary[4]; uschar buffer[44]; switch (type) { case 6: (void) host_aton(sub, binary); break; case 4: /* convert to IPv4-mapped IPv6 */ binary[0] = binary[1] = 0; binary[2] = 0x0000ffff; (void) host_aton(sub, binary+3); break; case 0: expand_string_message = string_sprintf("\"%s\" is not an IP address", sub); goto EXPAND_FAILED; } yield = string_catn(yield, buffer, c == EOP_IPV6NORM ? ipv6_nmtoa(binary, buffer) : host_nmtoa(4, binary, -1, buffer, ':') ); continue; } case EOP_ADDRESS: case EOP_LOCAL_PART: case EOP_DOMAIN: { uschar * error; int start, end, domain; uschar * t = parse_extract_address(sub, &error, &start, &end, &domain, FALSE); if (t) if (c != EOP_DOMAIN) yield = c == EOP_LOCAL_PART && domain > 0 ? string_catn(yield, t, domain - 1) : string_cat(yield, t); else if (domain > 0) yield = string_cat(yield, t + domain); continue; } case EOP_ADDRESSES: { uschar outsep[2] = { ':', '\0' }; uschar *address, *error; int save_ptr = gstring_length(yield); int start, end, domain; /* Not really used */ if (Uskip_whitespace(&sub) == '>') if (*outsep = *++sub) ++sub; else { expand_string_message = string_sprintf("output separator " "missing in expanding ${addresses:%s}", --sub); goto EXPAND_FAILED; } f.parse_allow_group = TRUE; for (;;) { uschar * p = parse_find_address_end(sub, FALSE); uschar saveend = *p; *p = '\0'; address = parse_extract_address(sub, &error, &start, &end, &domain, FALSE); *p = saveend; /* Add the address to the output list that we are building. This is done in chunks by searching for the separator character. At the start, unless we are dealing with the first address of the output list, add in a space if the new address begins with the separator character, or is an empty string. */ if (address) { if (yield && yield->ptr != save_ptr && address[0] == *outsep) yield = string_catn(yield, US" ", 1); for (;;) { size_t seglen = Ustrcspn(address, outsep); yield = string_catn(yield, address, seglen + 1); /* If we got to the end of the string we output one character too many. */ if (address[seglen] == '\0') { yield->ptr--; break; } yield = string_catn(yield, outsep, 1); address += seglen + 1; } /* Output a separator after the string: we will remove the redundant final one at the end. */ yield = string_catn(yield, outsep, 1); } if (saveend == '\0') break; sub = p + 1; } /* If we have generated anything, remove the redundant final separator. */ if (yield && yield->ptr != save_ptr) yield->ptr--; f.parse_allow_group = FALSE; continue; } /* quote puts a string in quotes if it is empty or contains anything other than alphamerics, underscore, dot, or hyphen. quote_local_part puts a string in quotes if RFC 2821/2822 requires it to be quoted in order to be a valid local part. In both cases, newlines and carriage returns are converted into \n and \r respectively */ case EOP_QUOTE: case EOP_QUOTE_LOCAL_PART: if (!arg) { BOOL needs_quote = (!*sub); /* TRUE for empty string */ uschar *t = sub - 1; if (c == EOP_QUOTE) while (!needs_quote && *++t) needs_quote = !isalnum(*t) && !strchr("_-.", *t); else /* EOP_QUOTE_LOCAL_PART */ while (!needs_quote && *++t) needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL && (*t != '.' || t == sub || !t[1]); if (needs_quote) { yield = string_catn(yield, US"\"", 1); t = sub - 1; while (*++t) if (*t == '\n') yield = string_catn(yield, US"\\n", 2); else if (*t == '\r') yield = string_catn(yield, US"\\r", 2); else { if (*t == '\\' || *t == '"') yield = string_catn(yield, US"\\", 1); yield = string_catn(yield, t, 1); } yield = string_catn(yield, US"\"", 1); } else yield = string_cat(yield, sub); continue; } /* quote_lookuptype does lookup-specific quoting */ else { int n; uschar *opt = Ustrchr(arg, '_'); if (opt) *opt++ = 0; if ((n = search_findtype(arg, Ustrlen(arg))) < 0) { expand_string_message = search_error_message; goto EXPAND_FAILED; } if (lookup_list[n]->quote) sub = (lookup_list[n]->quote)(sub, opt); else if (opt) sub = NULL; if (!sub) { expand_string_message = string_sprintf( "\"%s\" unrecognized after \"${quote_%s\"", opt, arg); goto EXPAND_FAILED; } yield = string_cat(yield, sub); continue; } /* rx quote sticks in \ before any non-alphameric character so that the insertion works in a regular expression. */ case EOP_RXQUOTE: { uschar *t = sub - 1; while (*(++t) != 0) { if (!isalnum(*t)) yield = string_catn(yield, US"\\", 1); yield = string_catn(yield, t, 1); } continue; } /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as prescribed by the RFC, if there are characters that need to be encoded */ case EOP_RFC2047: yield = string_cat(yield, parse_quote_2047(sub, Ustrlen(sub), headers_charset, FALSE)); continue; /* RFC 2047 decode */ case EOP_RFC2047D: { int len; uschar *error; uschar *decoded = rfc2047_decode(sub, check_rfc2047_length, headers_charset, '?', &len, &error); if (error) { expand_string_message = error; goto EXPAND_FAILED; } yield = string_catn(yield, decoded, len); continue; } /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into underscores */ case EOP_FROM_UTF8: { uschar * buff = store_get(4, is_tainted(sub)); while (*sub) { int c; GETUTF8INC(c, sub); if (c > 255) c = '_'; buff[0] = c; yield = string_catn(yield, buff, 1); } continue; } /* replace illegal UTF-8 sequences by replacement character */ #define UTF8_REPLACEMENT_CHAR US"?" case EOP_UTF8CLEAN: { int seq_len = 0, index = 0; int bytes_left = 0; long codepoint = -1; int complete; uschar seq_buff[4]; /* accumulate utf-8 here */ /* Manually track tainting, as we deal in individual chars below */ if (is_tainted(sub)) if (yield->s && yield->ptr) gstring_rebuffer(yield); else yield->s = store_get(yield->size = Ustrlen(sub), TRUE); /* Check the UTF-8, byte-by-byte */ while (*sub) { complete = 0; uschar c = *sub++; if (bytes_left) { if ((c & 0xc0) != 0x80) /* wrong continuation byte; invalidate all bytes */ complete = 1; /* error */ else { codepoint = (codepoint << 6) | (c & 0x3f); seq_buff[index++] = c; if (--bytes_left == 0) /* codepoint complete */ if(codepoint > 0x10FFFF) /* is it too large? */ complete = -1; /* error (RFC3629 limit) */ else { /* finished; output utf-8 sequence */ yield = string_catn(yield, seq_buff, seq_len); index = 0; } } } else /* no bytes left: new sequence */ { if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */ { yield = string_catn(yield, &c, 1); continue; } if((c & 0xe0) == 0xc0) /* 2-byte sequence */ { if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */ complete = -1; else { bytes_left = 1; codepoint = c & 0x1f; } } else if((c & 0xf0) == 0xe0) /* 3-byte sequence */ { bytes_left = 2; codepoint = c & 0x0f; } else if((c & 0xf8) == 0xf0) /* 4-byte sequence */ { bytes_left = 3; codepoint = c & 0x07; } else /* invalid or too long (RFC3629 allows only 4 bytes) */ complete = -1; seq_buff[index++] = c; seq_len = bytes_left + 1; } /* if(bytes_left) */ if (complete != 0) { bytes_left = index = 0; yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1); } if ((complete == 1) && ((c & 0x80) == 0)) /* ASCII character follows incomplete sequence */ yield = string_catn(yield, &c, 1); } /* If given a sequence truncated mid-character, we also want to report ? * Eg, ${length_1:フィル} is one byte, not one character, so we expect * ${utf8clean:${length_1:フィル}} to yield '?' */ if (bytes_left != 0) yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1); continue; } #ifdef SUPPORT_I18N case EOP_UTF8_DOMAIN_TO_ALABEL: { uschar * error = NULL; uschar * s = string_domain_utf8_to_alabel(sub, &error); if (error) { expand_string_message = string_sprintf( "error converting utf8 (%s) to alabel: %s", string_printing(sub), error); goto EXPAND_FAILED; } yield = string_cat(yield, s); continue; } case EOP_UTF8_DOMAIN_FROM_ALABEL: { uschar * error = NULL; uschar * s = string_domain_alabel_to_utf8(sub, &error); if (error) { expand_string_message = string_sprintf( "error converting alabel (%s) to utf8: %s", string_printing(sub), error); goto EXPAND_FAILED; } yield = string_cat(yield, s); continue; } case EOP_UTF8_LOCALPART_TO_ALABEL: { uschar * error = NULL; uschar * s = string_localpart_utf8_to_alabel(sub, &error); if (error) { expand_string_message = string_sprintf( "error converting utf8 (%s) to alabel: %s", string_printing(sub), error); goto EXPAND_FAILED; } yield = string_cat(yield, s); DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s); continue; } case EOP_UTF8_LOCALPART_FROM_ALABEL: { uschar * error = NULL; uschar * s = string_localpart_alabel_to_utf8(sub, &error); if (error) { expand_string_message = string_sprintf( "error converting alabel (%s) to utf8: %s", string_printing(sub), error); goto EXPAND_FAILED; } yield = string_cat(yield, s); continue; } #endif /* EXPERIMENTAL_INTERNATIONAL */ /* escape turns all non-printing characters into escape sequences. */ case EOP_ESCAPE: { const uschar * t = string_printing(sub); yield = string_cat(yield, t); continue; } case EOP_ESCAPE8BIT: { uschar c; for (const uschar * s = sub; (c = *s); s++) yield = c < 127 && c != '\\' ? string_catn(yield, s, 1) : string_fmt_append(yield, "\\%03o", c); continue; } /* Handle numeric expression evaluation */ case EOP_EVAL: case EOP_EVAL10: { uschar *save_sub = sub; uschar *error = NULL; int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE); if (error) { expand_string_message = string_sprintf("error in expression " "evaluation: %s (after processing \"%.*s\")", error, (int)(sub-save_sub), save_sub); goto EXPAND_FAILED; } yield = string_fmt_append(yield, PR_EXIM_ARITH, n); continue; } /* Handle time period formatting */ case EOP_TIME_EVAL: { int n = readconf_readtime(sub, 0, FALSE); if (n < 0) { expand_string_message = string_sprintf("string \"%s\" is not an " "Exim time interval in \"%s\" operator", sub, name); goto EXPAND_FAILED; } yield = string_fmt_append(yield, "%d", n); continue; } case EOP_TIME_INTERVAL: { int n; uschar *t = read_number(&n, sub); if (*t != 0) /* Not A Number*/ { expand_string_message = string_sprintf("string \"%s\" is not a " "positive number in \"%s\" operator", sub, name); goto EXPAND_FAILED; } t = readconf_printtime(n); yield = string_cat(yield, t); continue; } /* Convert string to base64 encoding */ case EOP_STR2B64: case EOP_BASE64: { #ifndef DISABLE_TLS uschar * s = vp && *(void **)vp->value ? tls_cert_der_b64(*(void **)vp->value) : b64encode(CUS sub, Ustrlen(sub)); #else uschar * s = b64encode(CUS sub, Ustrlen(sub)); #endif yield = string_cat(yield, s); continue; } case EOP_BASE64D: { uschar * s; int len = b64decode(sub, &s); if (len < 0) { expand_string_message = string_sprintf("string \"%s\" is not " "well-formed for \"%s\" operator", sub, name); goto EXPAND_FAILED; } yield = string_cat(yield, s); continue; } /* strlen returns the length of the string */ case EOP_STRLEN: yield = string_fmt_append(yield, "%d", Ustrlen(sub)); continue; /* length_n or l_n takes just the first n characters or the whole string, whichever is the shorter; substr_m_n, and s_m_n take n characters from offset m; negative m take from the end; l_n is synonymous with s_0_n. If n is omitted in substr it takes the rest, either to the right or to the left. hash_n or h_n makes a hash of length n from the string, yielding n characters from the set a-z; hash_n_m makes a hash of length n, but uses m characters from the set a-zA-Z0-9. nhash_n returns a single number between 0 and n-1 (in text form), while nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies between 0 and n-1 and the second between 0 and m-1. */ case EOP_LENGTH: case EOP_L: case EOP_SUBSTR: case EOP_S: case EOP_HASH: case EOP_H: case EOP_NHASH: case EOP_NH: { int sign = 1; int value1 = 0; int value2 = -1; int *pn; int len; uschar *ret; if (!arg) { expand_string_message = string_sprintf("missing values after %s", name); goto EXPAND_FAILED; } /* "length" has only one argument, effectively being synonymous with substr_0_n. */ if (c == EOP_LENGTH || c == EOP_L) { pn = &value2; value2 = 0; } /* The others have one or two arguments; for "substr" the first may be negative. The second being negative means "not supplied". */ else { pn = &value1; if (name[0] == 's' && *arg == '-') { sign = -1; arg++; } } /* Read up to two numbers, separated by underscores */ ret = arg; while (*arg != 0) { if (arg != ret && *arg == '_' && pn == &value1) { pn = &value2; value2 = 0; if (arg[1] != 0) arg++; } else if (!isdigit(*arg)) { expand_string_message = string_sprintf("non-digit after underscore in \"%s\"", name); goto EXPAND_FAILED; } else *pn = (*pn)*10 + *arg++ - '0'; } value1 *= sign; /* Perform the required operation */ ret = c == EOP_HASH || c == EOP_H ? compute_hash(sub, value1, value2, &len) : c == EOP_NHASH || c == EOP_NH ? compute_nhash(sub, value1, value2, &len) : extract_substr(sub, value1, value2, &len); if (!ret) goto EXPAND_FAILED; yield = string_catn(yield, ret, len); continue; } /* Stat a path */ case EOP_STAT: { uschar smode[12]; uschar **modetable[3]; mode_t mode; struct stat st; if (expand_forbid & RDO_EXISTS) { expand_string_message = US"Use of the stat() expansion is not permitted"; goto EXPAND_FAILED; } if (stat(CS sub, &st) < 0) { expand_string_message = string_sprintf("stat(%s) failed: %s", sub, strerror(errno)); goto EXPAND_FAILED; } mode = st.st_mode; switch (mode & S_IFMT) { case S_IFIFO: smode[0] = 'p'; break; case S_IFCHR: smode[0] = 'c'; break; case S_IFDIR: smode[0] = 'd'; break; case S_IFBLK: smode[0] = 'b'; break; case S_IFREG: smode[0] = '-'; break; default: smode[0] = '?'; break; } modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky; modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid; modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid; for (int i = 0; i < 3; i++) { memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3); mode >>= 3; } smode[10] = 0; yield = string_fmt_append(yield, "mode=%04lo smode=%s inode=%ld device=%ld links=%ld " "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld", (long)(st.st_mode & 077777), smode, (long)st.st_ino, (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid, (long)st.st_gid, st.st_size, (long)st.st_atime, (long)st.st_mtime, (long)st.st_ctime); continue; } /* vaguely random number less than N */ case EOP_RANDINT: { int_eximarith_t max = expanded_string_integer(sub, TRUE); if (expand_string_message) goto EXPAND_FAILED; yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max)); continue; } /* Reverse IP, including IPv6 to dotted-nibble */ case EOP_REVERSE_IP: { int family, maskptr; uschar reversed[128]; family = string_is_ip_address(sub, &maskptr); if (family == 0) { expand_string_message = string_sprintf( "reverse_ip() not given an IP address [%s]", sub); goto EXPAND_FAILED; } invert_address(reversed, sub); yield = string_cat(yield, reversed); continue; } /* Unknown operator */ default: expand_string_message = string_sprintf("unknown expansion operator \"%s\"", name); goto EXPAND_FAILED; } } /* Handle a plain name. If this is the first thing in the expansion, release the pre-allocated buffer. If the result data is known to be in a new buffer, newsize will be set to the size of that buffer, and we can just point at that store instead of copying. Many expansion strings contain just one reference, so this is a useful optimization, especially for humungous headers ($message_headers). */ /*{*/ if (*s++ == '}') { int len; int newsize = 0; gstring * g = NULL; if (!yield) g = store_get(sizeof(gstring), FALSE); else if (yield->ptr == 0) { if (resetok) reset_point = store_reset(reset_point); yield = NULL; reset_point = store_mark(); g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */ } if (!(value = find_variable(name, FALSE, skipping, &newsize))) { expand_string_message = string_sprintf("unknown variable in \"${%s}\"", name); check_variable_error_message(name); goto EXPAND_FAILED; } len = Ustrlen(value); if (!yield && newsize) { yield = g; yield->size = newsize; yield->ptr = len; yield->s = value; } else yield = string_catn(yield, value, len); continue; } /* Else there's something wrong */ expand_string_message = string_sprintf("\"${%s\" is not a known operator (or a } is missing " "in a variable reference)", name); goto EXPAND_FAILED; } /* If we hit the end of the string when ket_ends is set, there is a missing terminating brace. */ if (ket_ends && *s == 0) { expand_string_message = malformed_header ? US"missing } at end of string - could be header name not terminated by colon" : US"missing } at end of string"; goto EXPAND_FAILED; } /* Expansion succeeded; yield may still be NULL here if nothing was actually added to the string. If so, set up an empty string. Add a terminating zero. If left != NULL, return a pointer to the terminator. */ if (!yield) yield = string_get(1); (void) string_from_gstring(yield); if (left) *left = s; /* Any stacking store that was used above the final string is no longer needed. In many cases the final string will be the first one that was got and so there will be optimal store usage. */ if (resetok) gstring_release_unused(yield); else if (resetok_p) *resetok_p = FALSE; DEBUG(D_expand) { BOOL tainted = is_tainted(yield->s); DEBUG(D_noutf8) { debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string); debug_printf_indent("%sresult: %s\n", skipping ? "|-----" : "\\_____", yield->s); if (tainted) debug_printf_indent("%s \\__(tainted)\n", skipping ? "| " : " "); if (skipping) debug_printf_indent("\\___skipping: result is not used\n"); } else { debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ "expanding: %.*s\n", (int)(s - string), string); debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "result: %s\n", skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT, yield->s); if (tainted) debug_printf_indent("%s(tainted)\n", skipping ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ); if (skipping) debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "skipping: result is not used\n"); } } expand_level--; return yield->s; /* This is the failure exit: easiest to program with a goto. We still need to update the pointer to the terminator, for cases of nested calls with "fail". */ EXPAND_FAILED_CURLY: if (malformed_header) expand_string_message = US"missing or misplaced { or } - could be header name not terminated by colon"; else if (!expand_string_message || !*expand_string_message) expand_string_message = US"missing or misplaced { or }"; /* At one point, Exim reset the store to yield (if yield was not NULL), but that is a bad idea, because expand_string_message is in dynamic store. */ EXPAND_FAILED: if (left) *left = s; DEBUG(D_expand) DEBUG(D_noutf8) { debug_printf_indent("|failed to expand: %s\n", string); debug_printf_indent("%serror message: %s\n", f.expand_string_forcedfail ? "|---" : "\\___", expand_string_message); if (f.expand_string_forcedfail) debug_printf_indent("\\failure was forced\n"); } else { debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n", string); debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "error message: %s\n", f.expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT, expand_string_message); if (f.expand_string_forcedfail) debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n"); } if (resetok_p && !resetok) *resetok_p = FALSE; expand_level--; return NULL; } /* This is the external function call. Do a quick check for any expansion metacharacters, and if there are none, just return the input string. Argument: the string to be expanded Returns: the expanded string, or NULL if expansion failed; if failure was due to a lookup deferring, search_find_defer will be TRUE */ const uschar * expand_cstring(const uschar * string) { if (Ustrpbrk(string, "$\\") != NULL) { int old_pool = store_pool; uschar * s; f.search_find_defer = FALSE; malformed_header = FALSE; store_pool = POOL_MAIN; s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL); store_pool = old_pool; return s; } return string; } uschar * expand_string(uschar * string) { return US expand_cstring(CUS string); } /************************************************* * Expand and copy * *************************************************/ /* Now and again we want to expand a string and be sure that the result is in a new bit of store. This function does that. Since we know it has been copied, the de-const cast is safe. Argument: the string to be expanded Returns: the expanded string, always in a new bit of store, or NULL */ uschar * expand_string_copy(const uschar *string) { const uschar *yield = expand_cstring(string); if (yield == string) yield = string_copy(string); return US yield; } /************************************************* * Expand and interpret as an integer * *************************************************/ /* Expand a string, and convert the result into an integer. Arguments: string the string to be expanded isplus TRUE if a non-negative number is expected Returns: the integer value, or -1 for an expansion error ) in both cases, message in -2 for an integer interpretation error ) expand_string_message expand_string_message is set NULL for an OK integer */ int_eximarith_t expand_string_integer(uschar *string, BOOL isplus) { return expanded_string_integer(expand_string(string), isplus); } /************************************************* * Interpret string as an integer * *************************************************/ /* Convert a string (that has already been expanded) into an integer. This function is used inside the expansion code. Arguments: s the string to be expanded isplus TRUE if a non-negative number is expected Returns: the integer value, or -1 if string is NULL (which implies an expansion error) -2 for an integer interpretation error expand_string_message is set NULL for an OK integer */ static int_eximarith_t expanded_string_integer(const uschar *s, BOOL isplus) { int_eximarith_t value; uschar *msg = US"invalid integer \"%s\""; uschar *endptr; /* If expansion failed, expand_string_message will be set. */ if (!s) return -1; /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno to ERANGE. When there isn't an overflow, errno is not changed, at least on some systems, so we set it zero ourselves. */ errno = 0; expand_string_message = NULL; /* Indicates no error */ /* Before Exim 4.64, strings consisting entirely of whitespace compared equal to 0. Unfortunately, people actually relied upon that, so preserve the behaviour explicitly. Stripping leading whitespace is a harmless noop change since strtol skips it anyway (provided that there is a number to find at all). */ if (isspace(*s)) if (Uskip_whitespace(&s) == '\0') { DEBUG(D_expand) debug_printf_indent("treating blank string as number 0\n"); return 0; } value = strtoll(CS s, CSS &endptr, 10); if (endptr == s) msg = US"integer expected but \"%s\" found"; else if (value < 0 && isplus) msg = US"non-negative integer expected but \"%s\" found"; else { switch (tolower(*endptr)) { default: break; case 'k': if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE; else value *= 1024; endptr++; break; case 'm': if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE; else value *= 1024*1024; endptr++; break; case 'g': if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE; else value *= 1024*1024*1024; endptr++; break; } if (errno == ERANGE) msg = US"absolute value of integer \"%s\" is too large (overflow)"; else if (Uskip_whitespace(&endptr) == 0) return value; } expand_string_message = string_sprintf(CS msg, s); return -2; } /* These values are usually fixed boolean values, but they are permitted to be expanded strings. Arguments: addr address being routed mtype the module type mname the module name dbg_opt debug selectors oname the option name bvalue the router's boolean value svalue the router's string value rvalue where to put the returned value Returns: OK value placed in rvalue DEFER expansion failed */ int exp_bool(address_item *addr, uschar *mtype, uschar *mname, unsigned dbg_opt, uschar *oname, BOOL bvalue, uschar *svalue, BOOL *rvalue) { uschar *expanded; if (!svalue) { *rvalue = bvalue; return OK; } if (!(expanded = expand_string(svalue))) { if (f.expand_string_forcedfail) { DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname); *rvalue = bvalue; return OK; } addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s", oname, mname, mtype, expand_string_message); DEBUG(dbg_opt) debug_printf("%s\n", addr->message); return DEFER; } DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname, expanded); if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0) *rvalue = TRUE; else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0) *rvalue = FALSE; else { addr->message = string_sprintf("\"%s\" is not a valid value for the " "\"%s\" option in the %s %s", expanded, oname, mname, mtype); return DEFER; } return OK; } /* Avoid potentially exposing a password in a string about to be logged */ uschar * expand_hide_passwords(uschar * s) { return ( ( Ustrstr(s, "failed to expand") != NULL || Ustrstr(s, "expansion of ") != NULL ) && ( Ustrstr(s, "mysql") != NULL || Ustrstr(s, "pgsql") != NULL || Ustrstr(s, "redis") != NULL || Ustrstr(s, "sqlite") != NULL || Ustrstr(s, "ldap:") != NULL || Ustrstr(s, "ldaps:") != NULL || Ustrstr(s, "ldapi:") != NULL || Ustrstr(s, "ldapdn:") != NULL || Ustrstr(s, "ldapm:") != NULL ) ) ? US"Temporary internal error" : s; } /* Read given named file into big_buffer. Use for keying material etc. The content will have an ascii NUL appended. Arguments: filename as it says Return: pointer to buffer, or NULL on error. */ uschar * expand_file_big_buffer(const uschar * filename) { int fd, off = 0, len; if ((fd = exim_open2(CS filename, O_RDONLY)) < 0) { log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s", filename); return NULL; } do { if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0) { (void) close(fd); log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename); return NULL; } off += len; } while (len > 0); (void) close(fd); big_buffer[off] = '\0'; return big_buffer; } /************************************************* * Error-checking for testsuite * *************************************************/ typedef struct { uschar * region_start; uschar * region_end; const uschar *var_name; const uschar *var_data; } err_ctx; static void assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx) { err_ctx * e = ctx; if (var_data >= e->region_start && var_data < e->region_end) { e->var_name = CUS var_name; e->var_data = CUS var_data; } } void assert_no_variables(void * ptr, int len, const char * filename, int linenumber) { err_ctx e = { .region_start = ptr, .region_end = US ptr + len, .var_name = NULL, .var_data = NULL }; /* check acl_ variables */ tree_walk(acl_var_c, assert_variable_notin, &e); tree_walk(acl_var_m, assert_variable_notin, &e); /* check auth variables */ for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i]) assert_variable_notin(US"auth", auth_vars[i], &e); /* check regex variables */ for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i]) assert_variable_notin(US"regex", regex_vars[i], &e); /* check known-name variables */ for (var_entry * v = var_table; v < var_table + var_table_size; v++) if (v->type == vtype_stringptr) assert_variable_notin(US v->name, *(USS v->value), &e); /* check dns and address trees */ tree_walk(tree_dns_fails, assert_variable_notin, &e); tree_walk(tree_duplicates, assert_variable_notin, &e); tree_walk(tree_nonrecipients, assert_variable_notin, &e); tree_walk(tree_unusable, assert_variable_notin, &e); if (e.var_name) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'", e.var_name, filename, linenumber, e.var_data); } /************************************************* ************************************************** * Stand-alone test program * ************************************************** *************************************************/ #ifdef STAND_ALONE BOOL regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup) { int ovector[3*(EXPAND_MAXN+1)]; int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options, ovector, nelem(ovector)); BOOL yield = n >= 0; if (n == 0) n = EXPAND_MAXN + 1; if (yield) { expand_nmax = setup < 0 ? 0 : setup + 1; for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2) { expand_nstring[expand_nmax] = subject + ovector[nn]; expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; } expand_nmax--; } return yield; } int main(int argc, uschar **argv) { uschar buffer[1024]; debug_selector = D_v; debug_file = stderr; debug_fd = fileno(debug_file); big_buffer = malloc(big_buffer_size); for (int i = 1; i < argc; i++) { if (argv[i][0] == '+') { debug_trace_memory = 2; argv[i]++; } if (isdigit(argv[i][0])) debug_selector = Ustrtol(argv[i], NULL, 0); else if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") == Ustrlen(argv[i])) { #ifdef LOOKUP_LDAP eldap_default_servers = argv[i]; #endif #ifdef LOOKUP_MYSQL mysql_servers = argv[i]; #endif #ifdef LOOKUP_PGSQL pgsql_servers = argv[i]; #endif #ifdef LOOKUP_REDIS redis_servers = argv[i]; #endif } #ifdef EXIM_PERL else opt_perl_startup = argv[i]; #endif } printf("Testing string expansion: debug_level = %d\n\n", debug_level); expand_nstring[1] = US"string 1...."; expand_nlength[1] = 8; expand_nmax = 1; #ifdef EXIM_PERL if (opt_perl_startup != NULL) { uschar *errstr; printf("Starting Perl interpreter\n"); errstr = init_perl(opt_perl_startup); if (errstr != NULL) { printf("** error in perl_startup code: %s\n", errstr); return EXIT_FAILURE; } } #endif /* EXIM_PERL */ /* Thie deliberately regards the input as untainted, so that it can be expanded; only reasonable since this is a test for string-expansions. */ while (fgets(buffer, sizeof(buffer), stdin) != NULL) { rmark reset_point = store_mark(); uschar *yield = expand_string(buffer); if (yield) printf("%s\n", yield); else { if (f.search_find_defer) printf("search_find deferred\n"); printf("Failed: %s\n", expand_string_message); if (f.expand_string_forcedfail) printf("Forced failure\n"); printf("\n"); } store_reset(reset_point); } search_tidyup(); return 0; } #endif /* vi: aw ai sw=2 */ /* End of expand.c */