1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* Functions for handling string expansion. */
15 /* Recursively called function */
17 static uschar *expand_string_internal(const uschar *, BOOL, const uschar **, BOOL, BOOL, BOOL *);
18 static int_eximarith_t expanded_string_integer(const uschar *, BOOL);
21 # ifndef SUPPORT_CRYPTEQ
22 # define SUPPORT_CRYPTEQ
27 # include "lookups/ldap.h"
30 #ifdef SUPPORT_CRYPTEQ
35 extern char* crypt16(char*, char*);
39 /* The handling of crypt16() is a mess. I will record below the analysis of the
40 mess that was sent to me. We decided, however, to make changing this very low
41 priority, because in practice people are moving away from the crypt()
42 algorithms nowadays, so it doesn't seem worth it.
45 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
46 the first 8 characters of the password using a 20-round version of crypt
47 (standard crypt does 25 rounds). It then crypts the next 8 characters,
48 or an empty block if the password is less than 9 characters, using a
49 20-round version of crypt and the same salt as was used for the first
50 block. Characters after the first 16 are ignored. It always generates
51 a 16-byte hash, which is expressed together with the salt as a string
52 of 24 base 64 digits. Here are some links to peruse:
54 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
55 http://seclists.org/bugtraq/1999/Mar/0076.html
57 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
58 and OSF/1. This is the same as the standard crypt if given a password
59 of 8 characters or less. If given more, it first does the same as crypt
60 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
61 using as salt the first two base 64 digits from the first hash block.
62 If the password is more than 16 characters then it crypts the 17th to 24th
63 characters using as salt the first two base 64 digits from the second hash
64 block. And so on: I've seen references to it cutting off the password at
65 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
67 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
68 http://seclists.org/bugtraq/1999/Mar/0109.html
69 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
70 TET1_html/sec.c222.html#no_id_208
72 Exim has something it calls "crypt16". It will either use a native
73 crypt16 or its own implementation. A native crypt16 will presumably
74 be the one that I called "crypt16" above. The internal "crypt16"
75 function, however, is a two-block-maximum implementation of what I called
76 "bigcrypt". The documentation matches the internal code.
78 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
79 that crypt16 and bigcrypt were different things.
81 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
82 to whatever it is using under that name. This unfortunately sets a
83 precedent for using "{crypt16}" to identify two incompatible algorithms
84 whose output can't be distinguished. With "{crypt16}" thus rendered
85 ambiguous, I suggest you deprecate it and invent two new identifiers
86 for the two algorithms.
88 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
89 of the password separately means they can be cracked separately, so
90 the double-length hash only doubles the cracking effort instead of
91 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
98 /*************************************************
99 * Local statics and tables *
100 *************************************************/
102 /* Table of item names, and corresponding switch numbers. The names must be in
103 alphabetical order. */
105 static uschar *item_table[] = {
175 /* Tables of operator names, and corresponding switch numbers. The names must be
176 in alphabetical order. There are two tables, because underscore is used in some
177 cases to introduce arguments, whereas for other it is part of the name. This is
178 an historical mis-design. */
180 static uschar *op_table_underscore[] = {
183 US"quote_local_part",
188 ,US"utf8_domain_from_alabel",
189 US"utf8_domain_to_alabel",
190 US"utf8_localpart_from_alabel",
191 US"utf8_localpart_to_alabel"
198 EOP_QUOTE_LOCAL_PART,
203 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
204 EOP_UTF8_DOMAIN_TO_ALABEL,
205 EOP_UTF8_LOCALPART_FROM_ALABEL,
206 EOP_UTF8_LOCALPART_TO_ALABEL
210 static uschar *op_table_main[] = {
258 EOP_ADDRESS = nelem(op_table_underscore),
305 /* Table of condition names, and corresponding switch numbers. The names must
306 be in alphabetical order. */
308 static uschar *cond_table[] = {
312 US"==", /* Backward compatibility */
352 US"match_local_part",
377 ECOND_FIRST_DELIVERY,
405 ECOND_MATCH_LOCAL_PART,
415 /* Types of table entry */
418 vtype_int, /* value is address of int */
419 vtype_filter_int, /* ditto, but recognized only when filtering */
420 vtype_ino, /* value is address of ino_t (not always an int) */
421 vtype_uid, /* value is address of uid_t (not always an int) */
422 vtype_gid, /* value is address of gid_t (not always an int) */
423 vtype_bool, /* value is address of bool */
424 vtype_stringptr, /* value is address of pointer to string */
425 vtype_msgbody, /* as stringptr, but read when first required */
426 vtype_msgbody_end, /* ditto, the end of the message */
427 vtype_msgheaders, /* the message's headers, processed */
428 vtype_msgheaders_raw, /* the message's headers, unprocessed */
429 vtype_localpart, /* extract local part from string */
430 vtype_domain, /* extract domain from string */
431 vtype_string_func, /* value is string returned by given function */
432 vtype_todbsdin, /* value not used; generate BSD inbox tod */
433 vtype_tode, /* value not used; generate tod in epoch format */
434 vtype_todel, /* value not used; generate tod in epoch/usec format */
435 vtype_todf, /* value not used; generate full tod */
436 vtype_todl, /* value not used; generate log tod */
437 vtype_todlf, /* value not used; generate log file datestamp tod */
438 vtype_todzone, /* value not used; generate time zone only */
439 vtype_todzulu, /* value not used; generate zulu tod */
440 vtype_reply, /* value not used; get reply from headers */
441 vtype_pid, /* value not used; result is pid */
442 vtype_host_lookup, /* value not used; get host name */
443 vtype_load_avg, /* value not used; result is int from os_getloadavg */
444 vtype_pspace, /* partition space; value is T/F for spool/log */
445 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
446 vtype_cert /* SSL certificate */
448 ,vtype_dkim /* Lookup of value in DKIM signature */
452 /* Type for main variable table */
460 /* Type for entries pointing to address/length pairs. Not currently
468 static uschar * fn_recipients(void);
469 typedef uschar * stringptr_fn_t(void);
470 static uschar * fn_queue_size(void);
472 /* This table must be kept in alphabetical order. */
474 static var_entry var_table[] = {
475 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
476 they will be confused with user-creatable ACL variables. */
477 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
478 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
479 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
480 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
481 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
482 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
483 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
484 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
485 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
486 { "acl_narg", vtype_int, &acl_narg },
487 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
488 { "address_data", vtype_stringptr, &deliver_address_data },
489 { "address_file", vtype_stringptr, &address_file },
490 { "address_pipe", vtype_stringptr, &address_pipe },
491 #ifdef EXPERIMENTAL_ARC
492 { "arc_domains", vtype_string_func, (void *) &fn_arc_domains },
493 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
494 { "arc_state", vtype_stringptr, &arc_state },
495 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
497 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
498 { "authenticated_id", vtype_stringptr, &authenticated_id },
499 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
500 { "authentication_failed",vtype_int, &authentication_failed },
501 #ifdef WITH_CONTENT_SCAN
502 { "av_failed", vtype_int, &av_failed },
504 #ifdef EXPERIMENTAL_BRIGHTMAIL
505 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
506 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
507 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
508 { "bmi_deliver", vtype_int, &bmi_deliver },
510 { "body_linecount", vtype_int, &body_linecount },
511 { "body_zerocount", vtype_int, &body_zerocount },
512 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
513 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
514 { "caller_gid", vtype_gid, &real_gid },
515 { "caller_uid", vtype_uid, &real_uid },
516 { "callout_address", vtype_stringptr, &callout_address },
517 { "compile_date", vtype_stringptr, &version_date },
518 { "compile_number", vtype_stringptr, &version_cnumber },
519 { "config_dir", vtype_stringptr, &config_main_directory },
520 { "config_file", vtype_stringptr, &config_main_filename },
521 { "csa_status", vtype_stringptr, &csa_status },
522 #ifdef EXPERIMENTAL_DCC
523 { "dcc_header", vtype_stringptr, &dcc_header },
524 { "dcc_result", vtype_stringptr, &dcc_result },
527 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
528 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
529 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
530 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
531 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
532 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
533 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
534 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
535 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
536 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
537 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
538 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
539 { "dkim_key_length", vtype_int, &dkim_key_length },
540 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
541 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
542 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
543 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
544 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
545 { "dkim_signers", vtype_stringptr, &dkim_signers },
546 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
547 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
550 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
551 { "dmarc_status", vtype_stringptr, &dmarc_status },
552 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
553 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
555 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
556 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
557 { "dnslist_text", vtype_stringptr, &dnslist_text },
558 { "dnslist_value", vtype_stringptr, &dnslist_value },
559 { "domain", vtype_stringptr, &deliver_domain },
560 { "domain_data", vtype_stringptr, &deliver_domain_data },
561 #ifndef DISABLE_EVENT
562 { "event_data", vtype_stringptr, &event_data },
564 /*XXX want to use generic vars for as many of these as possible*/
565 { "event_defer_errno", vtype_int, &event_defer_errno },
567 { "event_name", vtype_stringptr, &event_name },
569 { "exim_gid", vtype_gid, &exim_gid },
570 { "exim_path", vtype_stringptr, &exim_path },
571 { "exim_uid", vtype_uid, &exim_uid },
572 { "exim_version", vtype_stringptr, &version_string },
573 { "headers_added", vtype_string_func, (void *) &fn_hdrs_added },
574 { "home", vtype_stringptr, &deliver_home },
575 { "host", vtype_stringptr, &deliver_host },
576 { "host_address", vtype_stringptr, &deliver_host_address },
577 { "host_data", vtype_stringptr, &host_data },
578 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
579 { "host_lookup_failed", vtype_int, &host_lookup_failed },
580 { "host_port", vtype_int, &deliver_host_port },
581 { "initial_cwd", vtype_stringptr, &initial_cwd },
582 { "inode", vtype_ino, &deliver_inode },
583 { "interface_address", vtype_stringptr, &interface_address },
584 { "interface_port", vtype_int, &interface_port },
585 { "item", vtype_stringptr, &iterate_item },
587 { "ldap_dn", vtype_stringptr, &eldap_dn },
589 { "load_average", vtype_load_avg, NULL },
590 { "local_part", vtype_stringptr, &deliver_localpart },
591 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
592 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
593 { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v },
594 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
595 { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v },
596 #ifdef HAVE_LOCAL_SCAN
597 { "local_scan_data", vtype_stringptr, &local_scan_data },
599 { "local_user_gid", vtype_gid, &local_user_gid },
600 { "local_user_uid", vtype_uid, &local_user_uid },
601 { "localhost_number", vtype_int, &host_number },
602 { "log_inodes", vtype_pinodes, (void *)FALSE },
603 { "log_space", vtype_pspace, (void *)FALSE },
604 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
605 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
606 #ifdef WITH_CONTENT_SCAN
607 { "malware_name", vtype_stringptr, &malware_name },
609 { "max_received_linelength", vtype_int, &max_received_linelength },
610 { "message_age", vtype_int, &message_age },
611 { "message_body", vtype_msgbody, &message_body },
612 { "message_body_end", vtype_msgbody_end, &message_body_end },
613 { "message_body_size", vtype_int, &message_body_size },
614 { "message_exim_id", vtype_stringptr, &message_id },
615 { "message_headers", vtype_msgheaders, NULL },
616 { "message_headers_raw", vtype_msgheaders_raw, NULL },
617 { "message_id", vtype_stringptr, &message_id },
618 { "message_linecount", vtype_int, &message_linecount },
619 { "message_size", vtype_int, &message_size },
621 { "message_smtputf8", vtype_bool, &message_smtputf8 },
623 #ifdef WITH_CONTENT_SCAN
624 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
625 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
626 { "mime_boundary", vtype_stringptr, &mime_boundary },
627 { "mime_charset", vtype_stringptr, &mime_charset },
628 { "mime_content_description", vtype_stringptr, &mime_content_description },
629 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
630 { "mime_content_id", vtype_stringptr, &mime_content_id },
631 { "mime_content_size", vtype_int, &mime_content_size },
632 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
633 { "mime_content_type", vtype_stringptr, &mime_content_type },
634 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
635 { "mime_filename", vtype_stringptr, &mime_filename },
636 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
637 { "mime_is_multipart", vtype_int, &mime_is_multipart },
638 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
639 { "mime_part_count", vtype_int, &mime_part_count },
641 { "n0", vtype_filter_int, &filter_n[0] },
642 { "n1", vtype_filter_int, &filter_n[1] },
643 { "n2", vtype_filter_int, &filter_n[2] },
644 { "n3", vtype_filter_int, &filter_n[3] },
645 { "n4", vtype_filter_int, &filter_n[4] },
646 { "n5", vtype_filter_int, &filter_n[5] },
647 { "n6", vtype_filter_int, &filter_n[6] },
648 { "n7", vtype_filter_int, &filter_n[7] },
649 { "n8", vtype_filter_int, &filter_n[8] },
650 { "n9", vtype_filter_int, &filter_n[9] },
651 { "original_domain", vtype_stringptr, &deliver_domain_orig },
652 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
653 { "originator_gid", vtype_gid, &originator_gid },
654 { "originator_uid", vtype_uid, &originator_uid },
655 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
656 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
657 { "pid", vtype_pid, NULL },
659 { "prdr_requested", vtype_bool, &prdr_requested },
661 { "primary_hostname", vtype_stringptr, &primary_hostname },
662 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
663 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
664 { "proxy_external_port", vtype_int, &proxy_external_port },
665 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
666 { "proxy_local_port", vtype_int, &proxy_local_port },
667 { "proxy_session", vtype_bool, &proxy_session },
669 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
670 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
671 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
672 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
673 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
674 { "queue_name", vtype_stringptr, &queue_name },
675 { "queue_size", vtype_string_func, &fn_queue_size },
676 { "rcpt_count", vtype_int, &rcpt_count },
677 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
678 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
679 { "received_count", vtype_int, &received_count },
680 { "received_for", vtype_stringptr, &received_for },
681 { "received_ip_address", vtype_stringptr, &interface_address },
682 { "received_port", vtype_int, &interface_port },
683 { "received_protocol", vtype_stringptr, &received_protocol },
684 { "received_time", vtype_int, &received_time.tv_sec },
685 { "recipient_data", vtype_stringptr, &recipient_data },
686 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
687 { "recipients", vtype_string_func, (void *) &fn_recipients },
688 { "recipients_count", vtype_int, &recipients_count },
689 #ifdef WITH_CONTENT_SCAN
690 { "regex_match_string", vtype_stringptr, ®ex_match_string },
692 { "reply_address", vtype_reply, NULL },
693 { "return_path", vtype_stringptr, &return_path },
694 { "return_size_limit", vtype_int, &bounce_return_size_limit },
695 { "router_name", vtype_stringptr, &router_name },
696 { "runrc", vtype_int, &runrc },
697 { "self_hostname", vtype_stringptr, &self_hostname },
698 { "sender_address", vtype_stringptr, &sender_address },
699 { "sender_address_data", vtype_stringptr, &sender_address_data },
700 { "sender_address_domain", vtype_domain, &sender_address },
701 { "sender_address_local_part", vtype_localpart, &sender_address },
702 { "sender_data", vtype_stringptr, &sender_data },
703 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
704 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
705 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
706 { "sender_host_address", vtype_stringptr, &sender_host_address },
707 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
708 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
709 { "sender_host_name", vtype_host_lookup, NULL },
710 { "sender_host_port", vtype_int, &sender_host_port },
711 { "sender_ident", vtype_stringptr, &sender_ident },
712 { "sender_rate", vtype_stringptr, &sender_rate },
713 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
714 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
715 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
716 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
717 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
718 { "sending_port", vtype_int, &sending_port },
719 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
720 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
721 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
722 { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist },
723 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
724 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
725 { "sn0", vtype_filter_int, &filter_sn[0] },
726 { "sn1", vtype_filter_int, &filter_sn[1] },
727 { "sn2", vtype_filter_int, &filter_sn[2] },
728 { "sn3", vtype_filter_int, &filter_sn[3] },
729 { "sn4", vtype_filter_int, &filter_sn[4] },
730 { "sn5", vtype_filter_int, &filter_sn[5] },
731 { "sn6", vtype_filter_int, &filter_sn[6] },
732 { "sn7", vtype_filter_int, &filter_sn[7] },
733 { "sn8", vtype_filter_int, &filter_sn[8] },
734 { "sn9", vtype_filter_int, &filter_sn[9] },
735 #ifdef WITH_CONTENT_SCAN
736 { "spam_action", vtype_stringptr, &spam_action },
737 { "spam_bar", vtype_stringptr, &spam_bar },
738 { "spam_report", vtype_stringptr, &spam_report },
739 { "spam_score", vtype_stringptr, &spam_score },
740 { "spam_score_int", vtype_stringptr, &spam_score_int },
743 { "spf_guess", vtype_stringptr, &spf_guess },
744 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
745 { "spf_received", vtype_stringptr, &spf_received },
746 { "spf_result", vtype_stringptr, &spf_result },
747 { "spf_result_guessed", vtype_bool, &spf_result_guessed },
748 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
750 { "spool_directory", vtype_stringptr, &spool_directory },
751 { "spool_inodes", vtype_pinodes, (void *)TRUE },
752 { "spool_space", vtype_pspace, (void *)TRUE },
753 #ifdef EXPERIMENTAL_SRS_ALT
754 { "srs_db_address", vtype_stringptr, &srs_db_address },
755 { "srs_db_key", vtype_stringptr, &srs_db_key },
756 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
757 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
759 #if defined(EXPERIMENTAL_SRS_ALT) || defined(SUPPORT_SRS)
760 { "srs_recipient", vtype_stringptr, &srs_recipient },
762 #ifdef EXPERIMENTAL_SRS_ALT
763 { "srs_status", vtype_stringptr, &srs_status },
765 { "thisaddress", vtype_stringptr, &filter_thisaddress },
767 /* The non-(in,out) variables are now deprecated */
768 { "tls_bits", vtype_int, &tls_in.bits },
769 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
770 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
772 { "tls_in_bits", vtype_int, &tls_in.bits },
773 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
774 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
775 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
776 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
777 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
778 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
779 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
780 #ifndef DISABLE_TLS_RESUME
781 { "tls_in_resumption", vtype_int, &tls_in.resumption },
784 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
786 { "tls_in_ver", vtype_stringptr, &tls_in.ver },
787 { "tls_out_bits", vtype_int, &tls_out.bits },
788 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
789 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
790 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
792 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
794 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
795 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
796 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
797 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
798 #ifndef DISABLE_TLS_RESUME
799 { "tls_out_resumption", vtype_int, &tls_out.resumption },
802 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
805 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
807 { "tls_out_ver", vtype_stringptr, &tls_out.ver },
809 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
811 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
814 { "tod_bsdinbox", vtype_todbsdin, NULL },
815 { "tod_epoch", vtype_tode, NULL },
816 { "tod_epoch_l", vtype_todel, NULL },
817 { "tod_full", vtype_todf, NULL },
818 { "tod_log", vtype_todl, NULL },
819 { "tod_logfile", vtype_todlf, NULL },
820 { "tod_zone", vtype_todzone, NULL },
821 { "tod_zulu", vtype_todzulu, NULL },
822 { "transport_name", vtype_stringptr, &transport_name },
823 { "value", vtype_stringptr, &lookup_value },
824 { "verify_mode", vtype_stringptr, &verify_mode },
825 { "version_number", vtype_stringptr, &version_string },
826 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
827 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
828 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
829 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
830 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
831 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
834 static int var_table_size = nelem(var_table);
835 static uschar var_buffer[256];
836 static BOOL malformed_header;
838 /* For textual hashes */
840 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
841 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
844 enum { HMAC_MD5, HMAC_SHA1 };
846 /* For numeric hashes */
848 static unsigned int prime[] = {
849 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
850 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
851 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
853 /* For printing modes in symbolic form */
855 static uschar *mtable_normal[] =
856 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
858 static uschar *mtable_setid[] =
859 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
861 static uschar *mtable_sticky[] =
862 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
864 /* flags for find_header() */
865 #define FH_EXISTS_ONLY BIT(0)
866 #define FH_WANT_RAW BIT(1)
867 #define FH_WANT_LIST BIT(2)
870 /*************************************************
871 * Tables for UTF-8 support *
872 *************************************************/
874 /* Table of the number of extra characters, indexed by the first character
875 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
878 static uschar utf8_table1[] = {
879 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
880 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
881 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
882 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
884 /* These are the masks for the data bits in the first byte of a character,
885 indexed by the number of additional bytes. */
887 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
889 /* Get the next UTF-8 character, advancing the pointer. */
891 #define GETUTF8INC(c, ptr) \
893 if ((c & 0xc0) == 0xc0) \
895 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
897 c = (c & utf8_table2[a]) << s; \
901 c |= (*ptr++ & 0x3f) << s; \
907 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
909 /*************************************************
910 * Binary chop search on a table *
911 *************************************************/
913 /* This is used for matching expansion items and operators.
916 name the name that is being sought
917 table the table to search
918 table_size the number of items in the table
920 Returns: the offset in the table, or -1
924 chop_match(uschar *name, uschar **table, int table_size)
926 uschar **bot = table;
927 uschar **top = table + table_size;
931 uschar **mid = bot + (top - bot)/2;
932 int c = Ustrcmp(name, *mid);
933 if (c == 0) return mid - table;
934 if (c > 0) bot = mid + 1; else top = mid;
942 /*************************************************
943 * Check a condition string *
944 *************************************************/
946 /* This function is called to expand a string, and test the result for a "true"
947 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
948 forced fail or lookup defer.
950 We used to release all store used, but this is not not safe due
951 to ${dlfunc } and ${acl }. In any case expand_string_internal()
952 is reasonably careful to release what it can.
954 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
957 condition the condition string
958 m1 text to be incorporated in panic error
961 Returns: TRUE if condition is met, FALSE if not
965 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
967 uschar * ss = expand_string(condition);
970 if (!f.expand_string_forcedfail && !f.search_find_defer)
971 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
972 "for %s %s: %s", condition, m1, m2, expand_string_message);
975 return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
976 strcmpic(ss, US"false") != 0;
982 /*************************************************
983 * Pseudo-random number generation *
984 *************************************************/
986 /* Pseudo-random number generation. The result is not "expected" to be
987 cryptographically strong but not so weak that someone will shoot themselves
988 in the foot using it as a nonce in some email header scheme or whatever
989 weirdness they'll twist this into. The result should ideally handle fork().
991 However, if we're stuck unable to provide this, then we'll fall back to
992 appallingly bad randomness.
994 If DISABLE_TLS is not defined then this will not be used except as an emergency
999 Returns a random number in range [0, max-1]
1003 # define vaguely_random_number vaguely_random_number_fallback
1006 vaguely_random_number(int max)
1009 # undef vaguely_random_number
1011 static pid_t pid = 0;
1014 if ((p2 = getpid()) != pid)
1019 #ifdef HAVE_ARC4RANDOM
1020 /* cryptographically strong randomness, common on *BSD platforms, not
1021 so much elsewhere. Alas. */
1022 # ifndef NOT_HAVE_ARC4RANDOM_STIR
1025 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1026 # ifdef HAVE_SRANDOMDEV
1027 /* uses random(4) for seeding */
1032 gettimeofday(&tv, NULL);
1033 srandom(tv.tv_sec | tv.tv_usec | getpid());
1037 /* Poor randomness and no seeding here */
1044 #ifdef HAVE_ARC4RANDOM
1045 return arc4random() % max;
1046 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1047 return random() % max;
1049 /* This one returns a 16-bit number, definitely not crypto-strong */
1050 return random_number(max);
1057 /*************************************************
1058 * Pick out a name from a string *
1059 *************************************************/
1061 /* If the name is too long, it is silently truncated.
1064 name points to a buffer into which to put the name
1065 max is the length of the buffer
1066 s points to the first alphabetic character of the name
1067 extras chars other than alphanumerics to permit
1069 Returns: pointer to the first character after the name
1071 Note: The test for *s != 0 in the while loop is necessary because
1072 Ustrchr() yields non-NULL if the character is zero (which is not something
1075 static const uschar *
1076 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1079 while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1081 if (ptr < max-1) name[ptr++] = *s;
1090 /*************************************************
1091 * Pick out the rest of a header name *
1092 *************************************************/
1094 /* A variable name starting $header_ (or just $h_ for those who like
1095 abbreviations) might not be the complete header name because headers can
1096 contain any printing characters in their names, except ':'. This function is
1097 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1098 on the end, if the name was terminated by white space.
1101 name points to a buffer in which the name read so far exists
1102 max is the length of the buffer
1103 s points to the first character after the name so far, i.e. the
1104 first non-alphameric character after $header_xxxxx
1106 Returns: a pointer to the first character after the header name
1109 static const uschar *
1110 read_header_name(uschar *name, int max, const uschar *s)
1112 int prelen = Ustrchr(name, '_') - name + 1;
1113 int ptr = Ustrlen(name) - prelen;
1114 if (ptr > 0) memmove(name, name+prelen, ptr);
1115 while (mac_isgraph(*s) && *s != ':')
1117 if (ptr < max-1) name[ptr++] = *s;
1128 /*************************************************
1129 * Pick out a number from a string *
1130 *************************************************/
1133 n points to an integer into which to put the number
1134 s points to the first digit of the number
1136 Returns: a pointer to the character after the last digit
1138 /*XXX consider expanding to int_eximarith_t. But the test for
1139 "overbig numbers" in 0002 still needs to overflow it. */
1142 read_number(int *n, uschar *s)
1145 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1149 static const uschar *
1150 read_cnumber(int *n, const uschar *s)
1153 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1159 /*************************************************
1160 * Extract keyed subfield from a string *
1161 *************************************************/
1163 /* The yield is in dynamic store; NULL means that the key was not found.
1166 key points to the name of the key
1167 s points to the string from which to extract the subfield
1169 Returns: NULL if the subfield was not found, or
1170 a pointer to the subfield's data
1174 expand_getkeyed(const uschar * key, const uschar * s)
1176 int length = Ustrlen(key);
1177 Uskip_whitespace(&s);
1179 /* Loop to search for the key */
1185 const uschar * dkey = s;
1187 while (*s && *s != '=' && !isspace(*s)) s++;
1188 dkeylength = s - dkey;
1189 if (Uskip_whitespace(&s) == '=') while (isspace(*++s));
1191 data = string_dequote(&s);
1192 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1195 Uskip_whitespace(&s);
1204 find_var_ent(uschar * name)
1207 int last = var_table_size;
1209 while (last > first)
1211 int middle = (first + last)/2;
1212 int c = Ustrcmp(name, var_table[middle].name);
1214 if (c > 0) { first = middle + 1; continue; }
1215 if (c < 0) { last = middle; continue; }
1216 return &var_table[middle];
1221 /*************************************************
1222 * Extract numbered subfield from string *
1223 *************************************************/
1225 /* Extracts a numbered field from a string that is divided by tokens - for
1226 example a line from /etc/passwd is divided by colon characters. First field is
1227 numbered one. Negative arguments count from the right. Zero returns the whole
1228 string. Returns NULL if there are insufficient tokens in the string
1231 Modifies final argument - this is a dynamically generated string, so that's OK.
1234 field number of field to be extracted,
1235 first field = 1, whole string = 0, last field = -1
1236 separators characters that are used to break string into tokens
1237 s points to the string from which to extract the subfield
1239 Returns: NULL if the field was not found,
1240 a pointer to the field's data inside s (modified to add 0)
1244 expand_gettokened (int field, uschar *separators, uschar *s)
1249 uschar *fieldtext = NULL;
1251 if (field == 0) return s;
1253 /* Break the line up into fields in place; for field > 0 we stop when we have
1254 done the number of fields we want. For field < 0 we continue till the end of
1255 the string, counting the number of fields. */
1257 count = (field > 0)? field : INT_MAX;
1263 /* Previous field was the last one in the string. For a positive field
1264 number, this means there are not enough fields. For a negative field number,
1265 check that there are enough, and scan back to find the one that is wanted. */
1269 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1270 if ((-field) == (INT_MAX - count - 1)) return s;
1274 while (ss[-1] != 0) ss--;
1280 /* Previous field was not last in the string; save its start and put a
1284 len = Ustrcspn(ss, separators);
1295 expand_getlistele(int field, const uschar * list)
1297 const uschar * tlist = list;
1299 /* Tainted mem for the throwaway element copies */
1300 uschar * dummy = store_get(2, TRUE);
1304 for (field++; string_nextinlist(&tlist, &sep, dummy, 1); ) field++;
1307 if (field == 0) return NULL;
1308 while (--field > 0 && (string_nextinlist(&list, &sep, dummy, 1))) ;
1309 return string_nextinlist(&list, &sep, NULL, 0);
1313 /* Certificate fields, by name. Worry about by-OID later */
1314 /* Names are chosen to not have common prefixes */
1321 uschar * (*getfn)(void * cert, uschar * mod);
1323 static certfield certfields[] =
1324 { /* linear search; no special order */
1325 { US"version", 7, &tls_cert_version },
1326 { US"serial_number", 13, &tls_cert_serial_number },
1327 { US"subject", 7, &tls_cert_subject },
1328 { US"notbefore", 9, &tls_cert_not_before },
1329 { US"notafter", 8, &tls_cert_not_after },
1330 { US"issuer", 6, &tls_cert_issuer },
1331 { US"signature", 9, &tls_cert_signature },
1332 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1333 { US"subj_altname", 12, &tls_cert_subject_altname },
1334 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1335 { US"crl_uri", 7, &tls_cert_crl_uri },
1339 expand_getcertele(uschar * field, uschar * certvar)
1343 if (!(vp = find_var_ent(certvar)))
1345 expand_string_message =
1346 string_sprintf("no variable named \"%s\"", certvar);
1347 return NULL; /* Unknown variable name */
1349 /* NB this stops us passing certs around in variable. Might
1350 want to do that in future */
1351 if (vp->type != vtype_cert)
1353 expand_string_message =
1354 string_sprintf("\"%s\" is not a certificate", certvar);
1355 return NULL; /* Unknown variable name */
1357 if (!*(void **)vp->value)
1360 if (*field >= '0' && *field <= '9')
1361 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1363 for (certfield * cp = certfields;
1364 cp < certfields + nelem(certfields);
1366 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1368 uschar * modifier = *(field += cp->namelen) == ','
1370 return (*cp->getfn)( *(void **)vp->value, modifier );
1373 expand_string_message =
1374 string_sprintf("bad field selector \"%s\" for certextract", field);
1377 #endif /*DISABLE_TLS*/
1379 /*************************************************
1380 * Extract a substring from a string *
1381 *************************************************/
1383 /* Perform the ${substr or ${length expansion operations.
1386 subject the input string
1387 value1 the offset from the start of the input string to the start of
1388 the output string; if negative, count from the right.
1389 value2 the length of the output string, or negative (-1) for unset
1390 if value1 is positive, unset means "all after"
1391 if value1 is negative, unset means "all before"
1392 len set to the length of the returned string
1394 Returns: pointer to the output string, or NULL if there is an error
1398 extract_substr(uschar *subject, int value1, int value2, int *len)
1400 int sublen = Ustrlen(subject);
1402 if (value1 < 0) /* count from right */
1406 /* If the position is before the start, skip to the start, and adjust the
1407 length. If the length ends up negative, the substring is null because nothing
1408 can precede. This falls out naturally when the length is unset, meaning "all
1414 if (value2 < 0) value2 = 0;
1418 /* Otherwise an unset length => characters before value1 */
1420 else if (value2 < 0)
1427 /* For a non-negative offset, if the starting position is past the end of the
1428 string, the result will be the null string. Otherwise, an unset length means
1429 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1433 if (value1 > sublen)
1438 else if (value2 < 0) value2 = sublen;
1441 /* Cut the length down to the maximum possible for the offset value, and get
1442 the required characters. */
1444 if (value1 + value2 > sublen) value2 = sublen - value1;
1446 return subject + value1;
1452 /*************************************************
1453 * Old-style hash of a string *
1454 *************************************************/
1456 /* Perform the ${hash expansion operation.
1459 subject the input string (an expanded substring)
1460 value1 the length of the output string; if greater or equal to the
1461 length of the input string, the input string is returned
1462 value2 the number of hash characters to use, or 26 if negative
1463 len set to the length of the returned string
1465 Returns: pointer to the output string, or NULL if there is an error
1469 compute_hash(uschar *subject, int value1, int value2, int *len)
1471 int sublen = Ustrlen(subject);
1473 if (value2 < 0) value2 = 26;
1474 else if (value2 > Ustrlen(hashcodes))
1476 expand_string_message =
1477 string_sprintf("hash count \"%d\" too big", value2);
1481 /* Calculate the hash text. We know it is shorter than the original string, so
1482 can safely place it in subject[] (we know that subject is always itself an
1483 expanded substring). */
1485 if (value1 < sublen)
1490 while ((c = (subject[j])) != 0)
1492 int shift = (c + j++) & 7;
1493 subject[i] ^= (c << shift) | (c >> (8-shift));
1494 if (++i >= value1) i = 0;
1496 for (i = 0; i < value1; i++)
1497 subject[i] = hashcodes[(subject[i]) % value2];
1499 else value1 = sublen;
1508 /*************************************************
1509 * Numeric hash of a string *
1510 *************************************************/
1512 /* Perform the ${nhash expansion operation. The first characters of the
1513 string are treated as most important, and get the highest prime numbers.
1516 subject the input string
1517 value1 the maximum value of the first part of the result
1518 value2 the maximum value of the second part of the result,
1519 or negative to produce only a one-part result
1520 len set to the length of the returned string
1522 Returns: pointer to the output string, or NULL if there is an error.
1526 compute_nhash (uschar *subject, int value1, int value2, int *len)
1528 uschar *s = subject;
1530 unsigned long int total = 0; /* no overflow */
1534 if (i == 0) i = nelem(prime) - 1;
1535 total += prime[i--] * (unsigned int)(*s++);
1538 /* If value2 is unset, just compute one number */
1541 s = string_sprintf("%lu", total % value1);
1543 /* Otherwise do a div/mod hash */
1547 total = total % (value1 * value2);
1548 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1559 /*************************************************
1560 * Find the value of a header or headers *
1561 *************************************************/
1563 /* Multiple instances of the same header get concatenated, and this function
1564 can also return a concatenation of all the header lines. When concatenating
1565 specific headers that contain lists of addresses, a comma is inserted between
1566 them. Otherwise we use a straight concatenation. Because some messages can have
1567 pathologically large number of lines, there is a limit on the length that is
1571 name the name of the header, without the leading $header_ or $h_,
1572 or NULL if a concatenation of all headers is required
1573 newsize return the size of memory block that was obtained; may be NULL
1574 if exists_only is TRUE
1575 flags FH_EXISTS_ONLY
1576 set if called from a def: test; don't need to build a string;
1577 just return a string that is not "" and not "0" if the header
1580 set if called for $rh_ or $rheader_ items; no processing,
1581 other than concatenating, will be done on the header. Also used
1582 for $message_headers_raw.
1584 Double colon chars in the content, and replace newline with
1585 colon between each element when concatenating; returning a
1586 colon-sep list (elements might contain newlines)
1587 charset name of charset to translate MIME words to; used only if
1588 want_raw is false; if NULL, no translation is done (this is
1589 used for $bh_ and $bheader_)
1591 Returns: NULL if the header does not exist, else a pointer to a new
1596 find_header(uschar *name, int *newsize, unsigned flags, const uschar *charset)
1599 int len = name ? Ustrlen(name) : 0;
1603 for (header_line * h = header_list; h; h = h->next)
1604 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1605 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1610 if (flags & FH_EXISTS_ONLY)
1611 return US"1"; /* don't need actual string */
1614 s = h->text + len; /* text to insert */
1615 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1616 Uskip_whitespace(&s); /* remove leading white space */
1617 t = h->text + h->slen; /* end-point */
1619 /* Unless wanted raw, remove trailing whitespace, including the
1622 if (flags & FH_WANT_LIST)
1623 while (t > s && t[-1] == '\n') t--;
1624 else if (!(flags & FH_WANT_RAW))
1626 while (t > s && isspace(t[-1])) t--;
1628 /* Set comma if handling a single header and it's one of those
1629 that contains an address list, except when asked for raw headers. Only
1630 need to do this once. */
1632 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1635 /* Trim the header roughly if we're approaching limits */
1637 if (gstring_length(g) + inc > header_insert_maxlen)
1638 inc = header_insert_maxlen - gstring_length(g);
1640 /* For raw just copy the data; for a list, add the data as a colon-sep
1641 list-element; for comma-list add as an unchecked comma,newline sep
1642 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1643 stripped trailing WS above including the newline). We ignore the potential
1644 expansion due to colon-doubling, just leaving the loop if the limit is met
1647 if (flags & FH_WANT_LIST)
1648 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1649 else if (flags & FH_WANT_RAW)
1650 g = string_catn(g, s, (unsigned)inc);
1652 g = string_append2_listele_n(g, comma ? US",\n" : US"\n",
1655 if (gstring_length(g) >= header_insert_maxlen) break;
1658 if (!found) return NULL; /* No header found */
1659 if (!g) return US"";
1661 /* That's all we do for raw header expansion. */
1664 if (flags & FH_WANT_RAW)
1665 return string_from_gstring(g);
1667 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1668 The rfc2047_decode2() function can return an error with decoded data if the
1669 charset translation fails. If decoding fails, it returns NULL. */
1673 uschar * error, * decoded = rfc2047_decode2(string_from_gstring(g),
1674 check_rfc2047_length, charset, '?', NULL, newsize, &error);
1676 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1677 " input was: %s\n", error, g->s);
1678 return decoded ? decoded : string_from_gstring(g);
1685 /* Append a "local" element to an Authentication-Results: header
1686 if this was a non-smtp message.
1690 authres_local(gstring * g, const uschar * sysname)
1692 if (!f.authentication_local)
1694 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1695 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1700 /* Append an "iprev" element to an Authentication-Results: header
1701 if we have attempted to get the calling host's name.
1705 authres_iprev(gstring * g)
1707 if (sender_host_name)
1708 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1709 else if (host_lookup_deferred)
1710 g = string_cat(g, US";\n\tiprev=temperror");
1711 else if (host_lookup_failed)
1712 g = string_cat(g, US";\n\tiprev=fail");
1716 if (sender_host_address)
1717 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1723 /*************************************************
1724 * Return list of recipients *
1725 *************************************************/
1726 /* A recipients list is available only during system message filtering,
1727 during ACL processing after DATA, and while expanding pipe commands
1728 generated from a system filter, but not elsewhere. */
1736 if (!f.enable_dollar_recipients) return NULL;
1738 for (int i = 0; i < recipients_count; i++)
1740 s = recipients_list[i].address;
1741 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1743 return g ? g->s : NULL;
1747 /*************************************************
1748 * Return size of queue *
1749 *************************************************/
1750 /* Ask the daemon for the queue size */
1755 struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
1759 const uschar * where;
1760 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1766 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1768 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1772 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1773 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1774 len = offsetof(struct sockaddr_un, sun_path) + 1
1775 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "exim_%d", getpid());
1777 sname = string_sprintf("%s/p_%d", spool_directory, getpid());
1778 len = offsetof(struct sockaddr_un, sun_path)
1779 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", sname);
1782 if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0)
1783 { where = US"bind"; goto bad; }
1786 debug_printf("local addr '%s%s'\n",
1787 *sa_un.sun_path ? "" : "@",
1788 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1791 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1792 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1793 len = offsetof(struct sockaddr_un, sun_path) + 1
1794 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "%s",
1795 expand_string(notifier_socket));
1797 len = offsetof(struct sockaddr_un, sun_path)
1798 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s",
1799 expand_string(notifier_socket));
1802 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1803 { where = US"connect"; goto bad2; }
1805 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1806 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1808 FD_ZERO(&fds); FD_SET(fd, &fds);
1809 tv.tv_sec = 2; tv.tv_usec = 0;
1810 if (select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv) != 1)
1812 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1813 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1815 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1816 { where = US"recv"; goto bad2; }
1819 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1822 return string_copyn(buf, len);
1825 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1830 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1835 /*************************************************
1836 * Find value of a variable *
1837 *************************************************/
1839 /* The table of variables is kept in alphabetic order, so we can search it
1840 using a binary chop. The "choplen" variable is nothing to do with the binary
1844 name the name of the variable being sought
1845 exists_only TRUE if this is a def: test; passed on to find_header()
1846 skipping TRUE => skip any processing evaluation; this is not the same as
1847 exists_only because def: may test for values that are first
1849 newsize pointer to an int which is initially zero; if the answer is in
1850 a new memory buffer, *newsize is set to its size
1852 Returns: NULL if the variable does not exist, or
1853 a pointer to the variable's contents, or
1854 something non-NULL if exists_only is TRUE
1857 static const uschar *
1858 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1865 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1866 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1867 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1868 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1869 (this gave backwards compatibility at the changeover). There may be built-in
1870 variables whose names start acl_ but they should never start in this way. This
1871 slightly messy specification is a consequence of the history, needless to say.
1873 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1874 set, in which case give an error. */
1876 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1880 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1881 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1883 else if (Ustrncmp(name, "r_", 2) == 0)
1885 tree_node * node = tree_search(router_var, name + 2);
1886 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1889 /* Handle $auth<n> variables. */
1891 if (Ustrncmp(name, "auth", 4) == 0)
1894 int n = Ustrtoul(name + 4, &endptr, 10);
1895 if (!*endptr && n != 0 && n <= AUTH_VARS)
1896 return auth_vars[n-1] ? auth_vars[n-1] : US"";
1898 else if (Ustrncmp(name, "regex", 5) == 0)
1901 int n = Ustrtoul(name + 5, &endptr, 10);
1902 if (!*endptr && n != 0 && n <= REGEX_VARS)
1903 return regex_vars[n-1] ? regex_vars[n-1] : US"";
1906 /* For all other variables, search the table */
1908 if (!(vp = find_var_ent(name)))
1909 return NULL; /* Unknown variable name */
1911 /* Found an existing variable. If in skipping state, the value isn't needed,
1912 and we want to avoid processing (such as looking up the host name). */
1920 case vtype_filter_int:
1921 if (!f.filter_running) return NULL;
1925 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1929 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1933 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1937 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1941 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1944 case vtype_stringptr: /* Pointer to string */
1945 return (s = *((uschar **)(val))) ? s : US"";
1948 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1951 case vtype_load_avg:
1952 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1955 case vtype_host_lookup: /* Lookup if not done so */
1956 if ( !sender_host_name && sender_host_address
1957 && !host_lookup_failed && host_name_lookup() == OK)
1958 host_build_sender_fullhost();
1959 return sender_host_name ? sender_host_name : US"";
1961 case vtype_localpart: /* Get local part from address */
1962 if (!(s = *((uschar **)(val)))) return US"";
1963 if (!(domain = Ustrrchr(s, '@'))) return s;
1964 if (domain - s > sizeof(var_buffer) - 1)
1965 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1966 " in string expansion", sizeof(var_buffer));
1967 return string_copyn(s, domain - s);
1969 case vtype_domain: /* Get domain from address */
1970 if (!(s = *((uschar **)(val)))) return US"";
1971 domain = Ustrrchr(s, '@');
1972 return domain ? domain + 1 : US"";
1974 case vtype_msgheaders:
1975 return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL);
1977 case vtype_msgheaders_raw:
1978 return find_header(NULL, newsize,
1979 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL);
1981 case vtype_msgbody: /* Pointer to msgbody string */
1982 case vtype_msgbody_end: /* Ditto, the end of the msg */
1983 ss = (uschar **)(val);
1984 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1987 off_t start_offset = SPOOL_DATA_START_OFFSET;
1988 int len = message_body_visible;
1990 if (len > message_size) len = message_size;
1991 *ss = body = store_get(len+1, TRUE);
1993 if (vp->type == vtype_msgbody_end)
1995 struct stat statbuf;
1996 if (fstat(deliver_datafile, &statbuf) == 0)
1998 start_offset = statbuf.st_size - len;
1999 if (start_offset < SPOOL_DATA_START_OFFSET)
2000 start_offset = SPOOL_DATA_START_OFFSET;
2003 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
2004 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
2006 if ((len = read(deliver_datafile, body, len)) > 0)
2009 if (message_body_newlines) /* Separate loops for efficiency */
2011 { if (body[--len] == 0) body[len] = ' '; }
2014 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
2017 return *ss ? *ss : US"";
2019 case vtype_todbsdin: /* BSD inbox time of day */
2020 return tod_stamp(tod_bsdin);
2022 case vtype_tode: /* Unix epoch time of day */
2023 return tod_stamp(tod_epoch);
2025 case vtype_todel: /* Unix epoch/usec time of day */
2026 return tod_stamp(tod_epoch_l);
2028 case vtype_todf: /* Full time of day */
2029 return tod_stamp(tod_full);
2031 case vtype_todl: /* Log format time of day */
2032 return tod_stamp(tod_log_bare); /* (without timezone) */
2034 case vtype_todzone: /* Time zone offset only */
2035 return tod_stamp(tod_zone);
2037 case vtype_todzulu: /* Zulu time */
2038 return tod_stamp(tod_zulu);
2040 case vtype_todlf: /* Log file datestamp tod */
2041 return tod_stamp(tod_log_datestamp_daily);
2043 case vtype_reply: /* Get reply address */
2044 s = find_header(US"reply-to:", newsize,
2045 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2047 if (s) Uskip_whitespace(&s);
2050 *newsize = 0; /* For the *s==0 case */
2051 s = find_header(US"from:", newsize,
2052 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2058 Uskip_whitespace(&s);
2059 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2060 while (t > s && isspace(t[-1])) t--;
2063 return s ? s : US"";
2065 case vtype_string_func:
2067 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2069 return s ? s : US"";
2075 sprintf(CS var_buffer, PR_EXIM_ARITH,
2076 receive_statvfs(val == (void *)TRUE, &inodes));
2083 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2084 sprintf(CS var_buffer, "%d", inodes);
2089 return *(void **)val ? US"<cert>" : US"";
2091 #ifndef DISABLE_DKIM
2093 return dkim_exim_expand_query((int)(long)val);
2098 return NULL; /* Unknown variable. Silences static checkers. */
2105 modify_variable(uschar *name, void * value)
2108 if ((vp = find_var_ent(name))) vp->value = value;
2109 return; /* Unknown variable name, fail silently */
2117 /*************************************************
2118 * Read and expand substrings *
2119 *************************************************/
2121 /* This function is called to read and expand argument substrings for various
2122 expansion items. Some have a minimum requirement that is less than the maximum;
2123 in these cases, the first non-present one is set to NULL.
2126 sub points to vector of pointers to set
2127 n maximum number of substrings
2129 sptr points to current string pointer
2130 skipping the skipping flag
2131 check_end if TRUE, check for final '}'
2132 name name of item, for error message
2133 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2136 Returns: 0 OK; string pointer updated
2137 1 curly bracketing error (too few arguments)
2138 2 too many arguments (only if check_end is set); message set
2139 3 other error (expansion failure)
2143 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2144 BOOL check_end, uschar *name, BOOL *resetok)
2146 const uschar *s = *sptr;
2148 Uskip_whitespace(&s);
2149 for (int i = 0; i < n; i++)
2155 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2156 "(min is %d)", name, m);
2162 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2164 if (*s++ != '}') return 1;
2165 Uskip_whitespace(&s);
2167 if (check_end && *s++ != '}')
2171 expand_string_message = string_sprintf("Too many arguments for '%s' "
2172 "(max is %d)", name, n);
2175 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2186 /*************************************************
2187 * Elaborate message for bad variable *
2188 *************************************************/
2190 /* For the "unknown variable" message, take a look at the variable's name, and
2191 give additional information about possible ACL variables. The extra information
2192 is added on to expand_string_message.
2194 Argument: the name of the variable
2199 check_variable_error_message(uschar *name)
2201 if (Ustrncmp(name, "acl_", 4) == 0)
2202 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2203 (name[4] == 'c' || name[4] == 'm')?
2205 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2206 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2208 US"user-defined ACL variables must start acl_c or acl_m");
2214 Load args from sub array to globals, and call acl_check().
2215 Sub array will be corrupted on return.
2217 Returns: OK access is granted by an ACCEPT verb
2218 DISCARD access is (apparently) granted by a DISCARD verb
2219 FAIL access is denied
2220 FAIL_DROP access is denied; drop the connection
2221 DEFER can't tell at the moment
2225 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2228 int sav_narg = acl_narg;
2230 uschar * dummy_logmsg;
2231 extern int acl_where;
2233 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2234 for (i = 0; i < nsub && sub[i+1]; i++)
2236 uschar * tmp = acl_arg[i];
2237 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2238 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2243 sub[i+1] = acl_arg[i];
2244 acl_arg[i++] = NULL;
2248 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2250 acl_narg>0 ? acl_arg[0] : US"<none>",
2251 acl_narg>1 ? " +more" : "");
2253 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2255 for (i = 0; i < nsub; i++)
2256 acl_arg[i] = sub[i+1]; /* restore old args */
2257 acl_narg = sav_narg;
2265 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2266 The given string is modified on return. Leading whitespace is skipped while
2267 looking for the opening wrap character, then the rest is scanned for the trailing
2268 (non-escaped) wrap character. A backslash in the string will act as an escape.
2270 A nul is written over the trailing wrap, and a pointer to the char after the
2271 leading wrap is returned.
2274 s String for de-wrapping
2275 wrap Two-char string, the first being the opener, second the closer wrapping
2278 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2282 dewrap(uschar * s, const uschar * wrap)
2286 BOOL quotesmode = wrap[0] == wrap[1];
2288 if (Uskip_whitespace(&p) == *wrap)
2294 if (*p == '\\') p++;
2295 else if (!quotesmode && *p == wrap[-1]) depth++;
2296 else if (*p == *wrap)
2307 expand_string_message = string_sprintf("missing '%c'", *wrap);
2312 /* Pull off the leading array or object element, returning
2313 a copy in an allocated string. Update the list pointer.
2315 The element may itself be an abject or array.
2316 Return NULL when the list is empty.
2320 json_nextinlist(const uschar ** list)
2322 unsigned array_depth = 0, object_depth = 0;
2323 const uschar * s = *list, * item;
2325 skip_whitespace(&s);
2328 *s && (*s != ',' || array_depth != 0 || object_depth != 0);
2332 case '[': array_depth++; break;
2333 case ']': array_depth--; break;
2334 case '{': object_depth++; break;
2335 case '}': object_depth--; break;
2337 *list = *s ? s+1 : s;
2338 if (item == s) return NULL;
2339 item = string_copyn(item, s - item);
2340 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2346 /************************************************/
2347 /* Return offset in ops table, or -1 if not found.
2348 Repoint to just after the operator in the string.
2351 ss string representation of operator
2352 opname split-out operator name
2356 identify_operator(const uschar ** ss, uschar ** opname)
2358 const uschar * s = *ss;
2361 /* Numeric comparisons are symbolic */
2363 if (*s == '=' || *s == '>' || *s == '<')
2375 /* All other conditions are named */
2378 s = read_name(name, sizeof(name), s, US"_");
2381 /* If we haven't read a name, it means some non-alpha character is first. */
2385 expand_string_message = string_sprintf("condition name expected, "
2386 "but found \"%.16s\"", s);
2390 *opname = string_copy(name);
2392 return chop_match(name, cond_table, nelem(cond_table));
2396 /*************************************************
2397 * Handle MD5 or SHA-1 computation for HMAC *
2398 *************************************************/
2400 /* These are some wrapping functions that enable the HMAC code to be a bit
2401 cleaner. A good compiler will spot the tail recursion.
2404 type HMAC_MD5 or HMAC_SHA1
2405 remaining are as for the cryptographic hash functions
2411 chash_start(int type, void * base)
2413 if (type == HMAC_MD5)
2414 md5_start((md5 *)base);
2416 sha1_start((hctx *)base);
2420 chash_mid(int type, void * base, const uschar * string)
2422 if (type == HMAC_MD5)
2423 md5_mid((md5 *)base, string);
2425 sha1_mid((hctx *)base, string);
2429 chash_end(int type, void * base, const uschar * string, int length,
2432 if (type == HMAC_MD5)
2433 md5_end((md5 *)base, string, length, digest);
2435 sha1_end((hctx *)base, string, length, digest);
2442 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2443 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2446 key encoding key, nul-terminated
2447 src data to be hashed, nul-terminated
2449 len size of output buffer
2453 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2456 const uschar * keyptr;
2458 unsigned int keylen;
2460 #define MD5_HASHLEN 16
2461 #define MD5_HASHBLOCKLEN 64
2463 uschar keyhash[MD5_HASHLEN];
2464 uschar innerhash[MD5_HASHLEN];
2465 uschar finalhash[MD5_HASHLEN];
2466 uschar innerkey[MD5_HASHBLOCKLEN];
2467 uschar outerkey[MD5_HASHBLOCKLEN];
2470 keylen = Ustrlen(keyptr);
2472 /* If the key is longer than the hash block length, then hash the key
2475 if (keylen > MD5_HASHBLOCKLEN)
2477 chash_start(HMAC_MD5, &md5_base);
2478 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2480 keylen = MD5_HASHLEN;
2483 /* Now make the inner and outer key values */
2485 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2486 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2488 for (int i = 0; i < keylen; i++)
2490 innerkey[i] ^= keyptr[i];
2491 outerkey[i] ^= keyptr[i];
2494 /* Now do the hashes */
2496 chash_start(HMAC_MD5, &md5_base);
2497 chash_mid(HMAC_MD5, &md5_base, innerkey);
2498 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2500 chash_start(HMAC_MD5, &md5_base);
2501 chash_mid(HMAC_MD5, &md5_base, outerkey);
2502 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2504 /* Encode the final hash as a hex string, limited by output buffer size */
2507 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2509 if (j-- <= 0) break;
2510 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2511 if (j-- <= 0) break;
2512 *p++ = hex_digits[finalhash[i] & 0x0f];
2516 #endif /*SUPPORT_SRS*/
2519 /*************************************************
2520 * Read and evaluate a condition *
2521 *************************************************/
2525 s points to the start of the condition text
2526 resetok points to a BOOL which is written false if it is unsafe to
2527 free memory. Certain condition types (acl) may have side-effect
2528 allocation which must be preserved.
2529 yield points to a BOOL to hold the result of the condition test;
2530 if NULL, we are just reading through a condition that is
2531 part of an "or" combination to check syntax, or in a state
2532 where the answer isn't required
2534 Returns: a pointer to the first character after the condition, or
2538 static const uschar *
2539 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2541 BOOL testfor = TRUE;
2542 BOOL tempcond, combined_cond;
2544 BOOL sub2_honour_dollar = TRUE;
2545 BOOL is_forany, is_json, is_jsons;
2547 int_eximarith_t num[2];
2548 struct stat statbuf;
2551 const uschar *sub[10];
2554 if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break;
2556 switch(cond_type = identify_operator(&s, &opname))
2558 /* def: tests for a non-empty variable, or for the existence of a header. If
2559 yield == NULL we are in a skipping state, and don't care about the answer. */
2567 expand_string_message = US"\":\" expected after \"def\"";
2571 s = read_name(name, sizeof(name), s+1, US"_");
2573 /* Test for a header's existence. If the name contains a closing brace
2574 character, this may be a user error where the terminating colon has been
2575 omitted. Set a flag to adjust a subsequent error message in this case. */
2577 if ( ( *(t = name) == 'h'
2578 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2580 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2583 s = read_header_name(name, sizeof(name), s);
2584 /* {-for-text-editors */
2585 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2587 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2590 /* Test for a variable's having a non-empty value. A non-existent variable
2591 causes an expansion failure. */
2595 if (!(t = find_variable(name, TRUE, yield == NULL, NULL)))
2597 expand_string_message = name[0]
2598 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2599 : US"variable name omitted after \"def:\"";
2600 check_variable_error_message(name);
2603 if (yield) *yield = (t[0] != 0) == testfor;
2610 /* first_delivery tests for first delivery attempt */
2612 case ECOND_FIRST_DELIVERY:
2613 if (yield) *yield = f.deliver_firsttime == testfor;
2617 /* queue_running tests for any process started by a queue runner */
2619 case ECOND_QUEUE_RUNNING:
2620 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2624 /* exists: tests for file existence
2625 isip: tests for any IP address
2626 isip4: tests for an IPv4 address
2627 isip6: tests for an IPv6 address
2628 pam: does PAM authentication
2629 radius: does RADIUS authentication
2630 ldapauth: does LDAP authentication
2631 pwcheck: does Cyrus SASL pwcheck authentication
2640 case ECOND_LDAPAUTH:
2643 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2645 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2646 if (!sub[0]) return NULL;
2647 /* {-for-text-editors */
2648 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2650 if (!yield) return s; /* No need to run the test if skipping */
2655 if ((expand_forbid & RDO_EXISTS) != 0)
2657 expand_string_message = US"File existence tests are not permitted";
2660 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2666 rc = string_is_ip_address(sub[0], NULL);
2667 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2668 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2671 /* Various authentication tests - all optionally compiled */
2675 rc = auth_call_pam(sub[0], &expand_string_message);
2678 goto COND_FAILED_NOT_COMPILED;
2679 #endif /* SUPPORT_PAM */
2682 #ifdef RADIUS_CONFIG_FILE
2683 rc = auth_call_radius(sub[0], &expand_string_message);
2686 goto COND_FAILED_NOT_COMPILED;
2687 #endif /* RADIUS_CONFIG_FILE */
2689 case ECOND_LDAPAUTH:
2692 /* Just to keep the interface the same */
2694 int old_pool = store_pool;
2695 store_pool = POOL_SEARCH;
2696 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2697 &expand_string_message, &do_cache);
2698 store_pool = old_pool;
2702 goto COND_FAILED_NOT_COMPILED;
2703 #endif /* LOOKUP_LDAP */
2706 #ifdef CYRUS_PWCHECK_SOCKET
2707 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2710 goto COND_FAILED_NOT_COMPILED;
2711 #endif /* CYRUS_PWCHECK_SOCKET */
2713 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2714 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2716 if (rc == ERROR || rc == DEFER) return NULL;
2717 *yield = (rc == OK) == testfor;
2723 /* call ACL (in a conditional context). Accept true, deny false.
2724 Defer is a forced-fail. Anything set by message= goes to $value.
2725 Up to ten parameters are used; we use the braces round the name+args
2726 like the saslauthd condition does, to permit a variable number of args.
2727 See also the expansion-item version EITEM_ACL and the traditional
2728 acl modifier ACLC_ACL.
2729 Since the ACL may allocate new global variables, tell our caller to not
2734 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2740 Uskip_whitespace(&s);
2741 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2743 switch(read_subs(sub, nelem(sub), 1,
2744 &s, yield == NULL, TRUE, name, resetok))
2746 case 1: expand_string_message = US"too few arguments or bracketing "
2749 case 3: return NULL;
2755 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2756 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2761 lookup_value = NULL;
2763 lookup_value = string_copy(user_msg);
2764 *yield = cond == testfor;
2768 f.expand_string_forcedfail = TRUE;
2771 expand_string_message = string_sprintf("%s from acl \"%s\"",
2772 rc_names[rc], sub[0]);
2780 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2782 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2784 However, the last two are optional. That is why the whole set is enclosed
2785 in their own set of braces. */
2787 case ECOND_SASLAUTHD:
2788 #ifndef CYRUS_SASLAUTHD_SOCKET
2789 goto COND_FAILED_NOT_COMPILED;
2793 Uskip_whitespace(&s);
2794 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2795 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, name,
2798 case 1: expand_string_message = US"too few arguments or bracketing "
2799 "error for saslauthd";
2801 case 3: return NULL;
2803 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2806 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2807 &expand_string_message);
2808 if (rc == ERROR || rc == DEFER) return NULL;
2809 *yield = (rc == OK) == testfor;
2813 #endif /* CYRUS_SASLAUTHD_SOCKET */
2816 /* symbolic operators for numeric and string comparison, and a number of
2817 other operators, all requiring two arguments.
2819 crypteq: encrypts plaintext and compares against an encrypted text,
2820 using crypt(), crypt16(), MD5 or SHA-1
2821 inlist/inlisti: checks if first argument is in the list of the second
2822 match: does a regular expression match and sets up the numerical
2823 variables if it succeeds
2824 match_address: matches in an address list
2825 match_domain: matches in a domain list
2826 match_ip: matches a host list that is restricted to IP addresses
2827 match_local_part: matches in a local part list
2830 case ECOND_MATCH_ADDRESS:
2831 case ECOND_MATCH_DOMAIN:
2832 case ECOND_MATCH_IP:
2833 case ECOND_MATCH_LOCAL_PART:
2834 #ifndef EXPAND_LISTMATCH_RHS
2835 sub2_honour_dollar = FALSE;
2844 case ECOND_NUM_L: /* Numerical comparisons */
2851 case ECOND_STR_LT: /* String comparisons */
2862 for (int i = 0; i < 2; i++)
2864 /* Sometimes, we don't expand substrings; too many insecure configurations
2865 created using match_address{}{} and friends, where the second param
2866 includes information from untrustworthy sources. */
2867 BOOL honour_dollar = TRUE;
2868 if ((i > 0) && !sub2_honour_dollar)
2869 honour_dollar = FALSE;
2871 if (Uskip_whitespace(&s) != '{')
2873 if (i == 0) goto COND_FAILED_CURLY_START;
2874 expand_string_message = string_sprintf("missing 2nd string in {} "
2875 "after \"%s\"", opname);
2878 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2879 honour_dollar, resetok)))
2881 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2882 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2883 " for security reasons\n");
2884 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2886 /* Convert to numerical if required; we know that the names of all the
2887 conditions that compare numbers do not start with a letter. This just saves
2888 checking for them individually. */
2890 if (!isalpha(opname[0]) && yield)
2895 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2899 num[i] = expanded_string_integer(sub[i], FALSE);
2900 if (expand_string_message) return NULL;
2904 /* Result not required */
2906 if (!yield) return s;
2908 /* Do an appropriate comparison */
2914 tempcond = (num[0] == num[1]);
2918 tempcond = (num[0] > num[1]);
2922 tempcond = (num[0] >= num[1]);
2926 tempcond = (num[0] < num[1]);
2930 tempcond = (num[0] <= num[1]);
2934 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2938 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2942 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2946 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2950 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2954 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2958 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2962 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2966 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2970 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2973 case ECOND_MATCH: /* Regular expression match */
2975 const pcre2_code * re;
2979 if (!(re = pcre2_compile((PCRE2_SPTR)sub[1], PCRE2_ZERO_TERMINATED,
2980 PCRE_COPT, &err, &offset, pcre_cmp_ctx)))
2983 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
2984 expand_string_message = string_sprintf("regular expression error in "
2985 "\"%s\": %s at offset %ld", sub[1], errbuf, (long)offset);
2989 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2993 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2994 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2995 goto MATCHED_SOMETHING;
2997 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2998 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2999 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
3000 goto MATCHED_SOMETHING;
3002 case ECOND_MATCH_IP: /* Match IP address in a host list */
3003 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
3005 expand_string_message = string_sprintf("\"%s\" is not an IP address",
3011 unsigned int *nullcache = NULL;
3012 check_host_block cb;
3014 cb.host_name = US"";
3015 cb.host_address = sub[0];
3017 /* If the host address starts off ::ffff: it is an IPv6 address in
3018 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3021 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
3022 cb.host_address + 7 : cb.host_address;
3024 rc = match_check_list(
3025 &sub[1], /* the list */
3026 0, /* separator character */
3027 &hostlist_anchor, /* anchor pointer */
3028 &nullcache, /* cache pointer */
3029 check_host, /* function for testing */
3030 &cb, /* argument for function */
3031 MCL_HOST, /* type of check */
3032 sub[0], /* text for debugging */
3033 NULL); /* where to pass back data */
3035 goto MATCHED_SOMETHING;
3037 case ECOND_MATCH_LOCAL_PART:
3038 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
3039 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
3054 expand_string_message = string_sprintf("unable to complete match "
3055 "against \"%s\": %s", sub[1], search_error_message);
3061 /* Various "encrypted" comparisons. If the second string starts with
3062 "{" then an encryption type is given. Default to crypt() or crypt16()
3063 (build-time choice). */
3064 /* }-for-text-editors */
3067 #ifndef SUPPORT_CRYPTEQ
3068 goto COND_FAILED_NOT_COMPILED;
3070 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3072 int sublen = Ustrlen(sub[1]+5);
3077 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3079 /* If the length that we are comparing against is 24, the MD5 digest
3080 is expressed as a base64 string. This is the way LDAP does it. However,
3081 some other software uses a straightforward hex representation. We assume
3082 this if the length is 32. Other lengths fail. */
3086 uschar *coded = b64encode(CUS digest, 16);
3087 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3088 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3089 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3091 else if (sublen == 32)
3094 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3096 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3097 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3098 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3102 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3103 "fail\n crypted=%s\n", sub[1]+5);
3108 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3110 int sublen = Ustrlen(sub[1]+6);
3115 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3117 /* If the length that we are comparing against is 28, assume the SHA1
3118 digest is expressed as a base64 string. If the length is 40, assume a
3119 straightforward hex representation. Other lengths fail. */
3123 uschar *coded = b64encode(CUS digest, 20);
3124 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3125 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3126 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3128 else if (sublen == 40)
3131 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3133 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3134 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3135 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3139 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3140 "fail\n crypted=%s\n", sub[1]+6);
3145 else /* {crypt} or {crypt16} and non-{ at start */
3146 /* }-for-text-editors */
3151 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3156 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3161 else if (sub[1][0] == '{') /* }-for-text-editors */
3163 expand_string_message = string_sprintf("unknown encryption mechanism "
3164 "in \"%s\"", sub[1]);
3170 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3171 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3172 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3176 #define XSTR(s) STR(s)
3177 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3178 " subject=%s\n crypted=%s\n",
3179 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3184 /* If the encrypted string contains fewer than two characters (for the
3185 salt), force failure. Otherwise we get false positives: with an empty
3186 string the yield of crypt() is an empty string! */
3189 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3190 else if (errno == EINVAL)
3194 expand_string_message = string_sprintf("crypt error: %s\n",
3195 US strerror(errno));
3200 #endif /* SUPPORT_CRYPTEQ */
3205 const uschar * list = sub[1];
3207 uschar *save_iterate_item = iterate_item;
3208 int (*compare)(const uschar *, const uschar *);
3210 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3213 compare = cond_type == ECOND_INLISTI
3214 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3216 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3218 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3219 if (compare(sub[0], iterate_item) == 0)
3225 iterate_item = save_iterate_item;
3228 } /* Switch for comparison conditions */
3230 *yield = tempcond == testfor;
3231 return s; /* End of comparison conditions */
3234 /* and/or: computes logical and/or of several conditions */
3238 subcondptr = (yield == NULL) ? NULL : &tempcond;
3239 combined_cond = (cond_type == ECOND_AND);
3241 Uskip_whitespace(&s);
3242 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3246 /* {-for-text-editors */
3247 if (Uskip_whitespace(&s) == '}') break;
3248 if (*s != '{') /* }-for-text-editors */
3250 expand_string_message = string_sprintf("each subcondition "
3251 "inside an \"%s{...}\" condition must be in its own {}", opname);
3255 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3257 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3258 expand_string_message, opname);
3261 Uskip_whitespace(&s);
3263 /* {-for-text-editors */
3266 /* {-for-text-editors */
3267 expand_string_message = string_sprintf("missing } at end of condition "
3268 "inside \"%s\" group", opname);
3273 if (cond_type == ECOND_AND)
3275 combined_cond &= tempcond;
3276 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3277 } /* evaluate any more */
3280 combined_cond |= tempcond;
3281 if (combined_cond) subcondptr = NULL; /* once true, don't */
3282 } /* evaluate any more */
3285 if (yield) *yield = (combined_cond == testfor);
3289 /* forall/forany: iterates a condition with different values */
3291 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3292 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3293 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3294 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3295 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3296 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3300 const uschar * list;
3302 uschar *save_iterate_item = iterate_item;
3304 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3306 Uskip_whitespace(&s);
3307 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3308 if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok)))
3310 /* {-for-text-editors */
3311 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3313 Uskip_whitespace(&s);
3314 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3318 /* Call eval_condition once, with result discarded (as if scanning a
3319 "false" part). This allows us to find the end of the condition, because if
3320 the list it empty, we won't actually evaluate the condition for real. */
3322 if (!(s = eval_condition(sub[1], resetok, NULL)))
3324 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3325 expand_string_message, opname);
3328 Uskip_whitespace(&s);
3330 /* {-for-text-editors */
3333 /* {-for-text-editors */
3334 expand_string_message = string_sprintf("missing } at end of condition "
3335 "inside \"%s\"", opname);
3339 if (yield) *yield = !testfor;
3341 if (is_json) list = dewrap(string_copy(list), US"[]");
3342 while ((iterate_item = is_json
3343 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3346 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3348 expand_string_message =
3349 string_sprintf("%s wrapping string result for extract jsons",
3350 expand_string_message);
3351 iterate_item = save_iterate_item;
3355 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3356 if (!eval_condition(sub[1], resetok, &tempcond))
3358 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3359 expand_string_message, opname);
3360 iterate_item = save_iterate_item;
3363 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3364 tempcond? "true":"false");
3366 if (yield) *yield = (tempcond == testfor);
3367 if (tempcond == is_forany) break;
3370 iterate_item = save_iterate_item;
3375 /* The bool{} expansion condition maps a string to boolean.
3376 The values supported should match those supported by the ACL condition
3377 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3378 of true/false. Note that Router "condition" rules have a different
3379 interpretation, where general data can be used and only a few values
3381 Note that readconf.c boolean matching, for boolean configuration options,
3382 only matches true/yes/false/no.
3383 The bool_lax{} condition matches the Router logic, which is much more
3386 case ECOND_BOOL_LAX:
3392 BOOL boolvalue = FALSE;
3394 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3395 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3396 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3398 case 1: expand_string_message = string_sprintf(
3399 "too few arguments or bracketing error for %s",
3403 case 3: return NULL;
3406 Uskip_whitespace(&t);
3407 if ((len = Ustrlen(t)))
3409 /* trailing whitespace: seems like a good idea to ignore it too */
3411 while (isspace(*t2)) t2--;
3412 if (t2 != (t + len))
3419 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3420 /* logic for the lax case from expand_check_condition(), which also does
3421 expands, and the logic is both short and stable enough that there should
3422 be no maintenance burden from replicating it. */
3426 ? Ustrspn(t+1, "0123456789") == len-1
3427 : Ustrspn(t, "0123456789") == len)
3429 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3430 /* expand_check_condition only does a literal string "0" check */
3431 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3434 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3436 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3438 else if (cond_type == ECOND_BOOL_LAX)
3442 expand_string_message = string_sprintf("unrecognised boolean "
3446 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3447 boolvalue? "true":"false");
3448 if (yield) *yield = (boolvalue == testfor);
3453 case ECOND_INBOUND_SRS:
3454 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3457 const pcre2_code * re;
3458 pcre2_match_data * md;
3462 BOOL boolvalue = FALSE;
3464 switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, name, resetok))
3466 case 1: expand_string_message = US"too few arguments or bracketing "
3467 "error for inbound_srs";
3469 case 3: return NULL;
3472 /* Match the given local_part against the SRS-encoded pattern */
3474 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$",
3476 md = pcre2_match_data_create(4+1, pcre_gen_ctx);
3477 if (pcre2_match(re, sub[0], PCRE2_ZERO_TERMINATED, 0, PCRE_EOPT,
3478 md, pcre_mtc_ctx) < 0)
3480 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3483 ovec = pcre2_get_ovector_pointer(md);
3485 if (sub[0][0] == '"')
3487 else for (uschar * s = sub[0]; *s; s++)
3488 if (!isalnum(*s) && Ustrchr(".!#$%&'*+-/=?^_`{|}~", *s) == NULL)
3489 { quoting = 1; break; }
3491 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
3493 /* Record the (quoted, if needed) decoded recipient as $srs_recipient */
3495 srs_recipient = string_sprintf("%.*s%.*S%.*s@%.*S", /* lowercased */
3497 ovec[9]-ovec[8], sub[0] + ovec[8], /* substring 4 */
3499 ovec[7]-ovec[6], sub[0] + ovec[6]); /* substring 3 */
3501 /* If a zero-length secret was given, we're done. Otherwise carry on
3502 and validate the given SRS local_part againt our secret. */
3510 /* check the timestamp */
3513 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3517 gettimeofday(&now, NULL);
3518 now.tv_sec /= 86400; /* days since epoch */
3520 /* Decode substring 2 from base32 to a number */
3522 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3524 uschar * t = Ustrchr(base32_chars, *ss++);
3525 d = d * 32 + (t - base32_chars);
3528 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3530 DEBUG(D_expand) debug_printf("SRS too old\n");
3535 /* check length of substring 1, the offered checksum */
3537 if (ovec[3]-ovec[2] != 4)
3539 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3543 /* Hash the address with our secret, and compare that computed checksum
3544 with the one extracted from the arg */
3546 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3547 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3549 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3555 if (yield) *yield = (boolvalue == testfor);
3558 #endif /*SUPPORT_SRS*/
3560 /* Unknown condition */
3563 if (!expand_string_message || !*expand_string_message)
3564 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3566 } /* End switch on condition type */
3568 /* Missing braces at start and end of data */
3570 COND_FAILED_CURLY_START:
3571 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3574 COND_FAILED_CURLY_END:
3575 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3579 /* A condition requires code that is not compiled */
3581 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3582 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3583 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3584 COND_FAILED_NOT_COMPILED:
3585 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3594 /*************************************************
3595 * Save numerical variables *
3596 *************************************************/
3598 /* This function is called from items such as "if" that want to preserve and
3599 restore the numbered variables.
3602 save_expand_string points to an array of pointers to set
3603 save_expand_nlength points to an array of ints for the lengths
3605 Returns: the value of expand max to save
3609 save_expand_strings(const uschar **save_expand_nstring, int *save_expand_nlength)
3611 for (int i = 0; i <= expand_nmax; i++)
3613 save_expand_nstring[i] = expand_nstring[i];
3614 save_expand_nlength[i] = expand_nlength[i];
3621 /*************************************************
3622 * Restore numerical variables *
3623 *************************************************/
3625 /* This function restored saved values of numerical strings.
3628 save_expand_nmax the number of strings to restore
3629 save_expand_string points to an array of pointers
3630 save_expand_nlength points to an array of ints
3636 restore_expand_strings(int save_expand_nmax, const uschar **save_expand_nstring,
3637 int *save_expand_nlength)
3639 expand_nmax = save_expand_nmax;
3640 for (int i = 0; i <= expand_nmax; i++)
3642 expand_nstring[i] = save_expand_nstring[i];
3643 expand_nlength[i] = save_expand_nlength[i];
3651 /*************************************************
3652 * Handle yes/no substrings *
3653 *************************************************/
3655 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3656 alternative substrings that depend on whether or not the condition was true,
3657 or the lookup or extraction succeeded. The substrings always have to be
3658 expanded, to check their syntax, but "skipping" is set when the result is not
3659 needed - this avoids unnecessary nested lookups.
3662 skipping TRUE if we were skipping when this item was reached
3663 yes TRUE if the first string is to be used, else use the second
3664 save_lookup a value to put back into lookup_value before the 2nd expansion
3665 sptr points to the input string pointer
3666 yieldptr points to the output growable-string pointer
3667 type "lookup", "if", "extract", "run", "env", "listextract" or
3668 "certextract" for error message
3669 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3672 Returns: 0 OK; lookup_value has been reset to save_lookup
3674 2 expansion failed because of bracketing error
3678 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3679 gstring ** yieldptr, uschar *type, BOOL *resetok)
3682 const uschar *s = *sptr; /* Local value */
3683 uschar *sub1, *sub2;
3684 const uschar * errwhere;
3686 /* If there are no following strings, we substitute the contents of $value for
3687 lookups and for extractions in the success case. For the ${if item, the string
3688 "true" is substituted. In the fail case, nothing is substituted for all three
3691 if (skip_whitespace(&s) == '}')
3695 if (yes && !skipping)
3696 *yieldptr = string_catn(*yieldptr, US"true", 4);
3700 if (yes && lookup_value && !skipping)
3701 *yieldptr = string_cat(*yieldptr, lookup_value);
3702 lookup_value = save_lookup;
3708 /* The first following string must be braced. */
3712 errwhere = US"'yes' part did not start with '{'";
3716 /* Expand the first substring. Forced failures are noticed only if we actually
3717 want this string. Set skipping in the call in the fail case (this will always
3718 be the case if we were already skipping). */
3720 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3721 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3722 f.expand_string_forcedfail = FALSE;
3725 errwhere = US"'yes' part did not end with '}'";
3729 /* If we want the first string, add it to the output */
3732 *yieldptr = string_cat(*yieldptr, sub1);
3734 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3735 $value to what it was at the start of the item, so that it has this value
3736 during the second string expansion. For the call from "if" or "run" to this
3737 function, save_lookup is set to lookup_value, so that this statement does
3740 lookup_value = save_lookup;
3742 /* There now follows either another substring, or "fail", or nothing. This
3743 time, forced failures are noticed only if we want the second string. We must
3744 set skipping in the nested call if we don't want this string, or if we were
3745 already skipping. */
3747 if (skip_whitespace(&s) == '{')
3749 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3750 if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3751 f.expand_string_forcedfail = FALSE;
3754 errwhere = US"'no' part did not start with '{'";
3758 /* If we want the second string, add it to the output */
3761 *yieldptr = string_cat(*yieldptr, sub2);
3764 /* If there is no second string, but the word "fail" is present when the use of
3765 the second string is wanted, set a flag indicating it was a forced failure
3766 rather than a syntactic error. Swallow the terminating } in case this is nested
3767 inside another lookup or if or extract. */
3772 /* deconst cast ok here as source is s anyway */
3773 s = US read_name(name, sizeof(name), s, US"_");
3774 if (Ustrcmp(name, "fail") == 0)
3776 if (!yes && !skipping)
3778 Uskip_whitespace(&s);
3781 errwhere = US"did not close with '}' after forcedfail";
3784 expand_string_message =
3785 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3786 f.expand_string_forcedfail = TRUE;
3792 expand_string_message =
3793 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3798 /* All we have to do now is to check on the final closing brace. */
3800 skip_whitespace(&s);
3803 errwhere = US"did not close with '}'";
3809 /* Update the input pointer value before returning */
3814 /* Get here if there is a bracketing failure */
3815 expand_string_message = string_sprintf(
3816 "curly-bracket problem in conditional yes/no parsing: %s\n"
3817 " remaining string is '%s'", errwhere, --s);
3822 /* Get here for other failures */
3830 /********************************************************
3831 * prvs: Get last three digits of days since Jan 1, 1970 *
3832 ********************************************************/
3834 /* This is needed to implement the "prvs" BATV reverse
3837 Argument: integer "days" offset to add or substract to
3838 or from the current number of days.
3840 Returns: pointer to string containing the last three
3841 digits of the number of days since Jan 1, 1970,
3842 modified by the offset argument, NULL if there
3843 was an error in the conversion.
3848 prvs_daystamp(int day_offset)
3850 uschar *days = store_get(32, FALSE); /* Need at least 24 for cases */
3851 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3852 (time(NULL) + day_offset*86400)/86400);
3853 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3858 /********************************************************
3859 * prvs: perform HMAC-SHA1 computation of prvs bits *
3860 ********************************************************/
3862 /* This is needed to implement the "prvs" BATV reverse
3866 address RFC2821 Address to use
3867 key The key to use (must be less than 64 characters
3869 key_num Single-digit key number to use. Defaults to
3872 Returns: pointer to string containing the first three
3873 bytes of the final hash in hex format, NULL if
3874 there was an error in the process.
3878 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3880 gstring * hash_source;
3883 uschar innerhash[20];
3884 uschar finalhash[20];
3885 uschar innerkey[64];
3886 uschar outerkey[64];
3887 uschar *finalhash_hex;
3892 if (Ustrlen(key) > 64)
3895 hash_source = string_catn(NULL, key_num, 1);
3896 hash_source = string_catn(hash_source, daystamp, 3);
3897 hash_source = string_cat(hash_source, address);
3898 (void) string_from_gstring(hash_source);
3901 debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s);
3903 memset(innerkey, 0x36, 64);
3904 memset(outerkey, 0x5c, 64);
3906 for (int i = 0; i < Ustrlen(key); i++)
3908 innerkey[i] ^= key[i];
3909 outerkey[i] ^= key[i];
3912 chash_start(HMAC_SHA1, &h);
3913 chash_mid(HMAC_SHA1, &h, innerkey);
3914 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
3916 chash_start(HMAC_SHA1, &h);
3917 chash_mid(HMAC_SHA1, &h, outerkey);
3918 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
3920 /* Hashing is deemed sufficient to de-taint any input data */
3922 p = finalhash_hex = store_get(40, FALSE);
3923 for (int i = 0; i < 3; i++)
3925 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3926 *p++ = hex_digits[finalhash[i] & 0x0f];
3930 return finalhash_hex;
3936 /*************************************************
3937 * Join a file onto the output string *
3938 *************************************************/
3940 /* This is used for readfile/readsock and after a run expansion.
3941 It joins the contents of a file onto the output string, globally replacing
3942 newlines with a given string (optionally).
3946 yield pointer to the expandable string struct
3947 eol newline replacement string, or NULL
3949 Returns: new pointer for expandable string, terminated if non-null
3953 cat_file(FILE *f, gstring *yield, uschar *eol)
3955 uschar buffer[1024];
3957 while (Ufgets(buffer, sizeof(buffer), f))
3959 int len = Ustrlen(buffer);
3960 if (eol && buffer[len-1] == '\n') len--;
3961 yield = string_catn(yield, buffer, len);
3962 if (eol && buffer[len])
3963 yield = string_cat(yield, eol);
3966 (void) string_from_gstring(yield);
3973 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
3976 uschar buffer[1024];
3978 /*XXX could we read direct into a pre-grown string? */
3980 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
3981 for (uschar * s = buffer; rc--; s++)
3982 yield = eol && *s == '\n'
3983 ? string_cat(yield, eol) : string_catn(yield, s, 1);
3985 /* We assume that all errors, and any returns of zero bytes,
3986 are actually EOF. */
3988 (void) string_from_gstring(yield);
3994 /*************************************************
3995 * Evaluate numeric expression *
3996 *************************************************/
3998 /* This is a set of mutually recursive functions that evaluate an arithmetic
3999 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
4000 these functions that is called from elsewhere is eval_expr, whose interface is:
4003 sptr pointer to the pointer to the string - gets updated
4004 decimal TRUE if numbers are to be assumed decimal
4005 error pointer to where to put an error message - must be NULL on input
4006 endket TRUE if ')' must terminate - FALSE for external call
4008 Returns: on success: the value of the expression, with *error still NULL
4009 on failure: an undefined value, with *error = a message
4012 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
4015 static int_eximarith_t
4016 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
4019 int_eximarith_t x = eval_op_or(&s, decimal, error);
4024 *error = US"expecting closing parenthesis";
4026 while (isspace(*++s));
4028 *error = US"expecting operator";
4034 static int_eximarith_t
4035 eval_number(uschar **sptr, BOOL decimal, uschar **error)
4041 if (isdigit((c = Uskip_whitespace(&s))))
4044 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4046 switch (tolower(*s))
4049 case 'k': n *= 1024; s++; break;
4050 case 'm': n *= 1024*1024; s++; break;
4051 case 'g': n *= 1024*1024*1024; s++; break;
4053 Uskip_whitespace(&s);
4058 n = eval_expr(&s, decimal, error, 1);
4062 *error = US"expecting number or opening parenthesis";
4070 static int_eximarith_t
4071 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4075 Uskip_whitespace(&s);
4076 if (*s == '+' || *s == '-' || *s == '~')
4079 x = eval_op_unary(&s, decimal, error);
4080 if (op == '-') x = -x;
4081 else if (op == '~') x = ~x;
4084 x = eval_number(&s, decimal, error);
4091 static int_eximarith_t
4092 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4095 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4098 while (*s == '*' || *s == '/' || *s == '%')
4101 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4103 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4104 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4105 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4106 * -N*M is INT_MIN will yield INT_MIN.
4107 * Since we don't support floating point, this is somewhat simpler.
4108 * Ideally, we'd return an error, but since we overflow for all other
4109 * arithmetic, consistency suggests otherwise, but what's the correct value
4110 * to use? There is none.
4111 * The C standard guarantees overflow for unsigned arithmetic but signed
4112 * overflow invokes undefined behaviour; in practice, this is overflow
4113 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4114 * that long/longlong larger than int are available, or we could just work
4115 * with larger types. We should consider whether to guarantee 32bit eval
4116 * and 64-bit working variables, with errors returned. For now ...
4117 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4118 * can just let the other invalid results occur otherwise, as they have
4119 * until now. For this one case, we can coerce.
4121 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4124 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4125 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4135 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4151 static int_eximarith_t
4152 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4155 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4158 while (*s == '+' || *s == '-')
4161 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4163 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4164 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4165 { /* over-conservative check */
4167 ? US"overflow in sum" : US"overflow in difference";
4170 if (op == '+') x += y; else x -= y;
4178 static int_eximarith_t
4179 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4182 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4185 while ((*s == '<' || *s == '>') && s[1] == s[0])
4190 y = eval_op_sum(&s, decimal, error);
4192 if (op == '<') x <<= y; else x >>= y;
4200 static int_eximarith_t
4201 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4204 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4211 y = eval_op_shift(&s, decimal, error);
4221 static int_eximarith_t
4222 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4225 int_eximarith_t x = eval_op_and(&s, decimal, error);
4232 y = eval_op_and(&s, decimal, error);
4242 static int_eximarith_t
4243 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4246 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4253 y = eval_op_xor(&s, decimal, error);
4264 /************************************************/
4265 /* Comparison operation for sort expansion. We need to avoid
4266 re-expanding the fields being compared, so need a custom routine.
4269 cond_type Comparison operator code
4270 leftarg, rightarg Arguments for comparison
4272 Return true iff (leftarg compare rightarg)
4276 sortsbefore(int cond_type, BOOL alpha_cond,
4277 const uschar * leftarg, const uschar * rightarg)
4279 int_eximarith_t l_num, r_num;
4283 l_num = expanded_string_integer(leftarg, FALSE);
4284 if (expand_string_message) return FALSE;
4285 r_num = expanded_string_integer(rightarg, FALSE);
4286 if (expand_string_message) return FALSE;
4290 case ECOND_NUM_G: return l_num > r_num;
4291 case ECOND_NUM_GE: return l_num >= r_num;
4292 case ECOND_NUM_L: return l_num < r_num;
4293 case ECOND_NUM_LE: return l_num <= r_num;
4300 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4301 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4302 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4303 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4304 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4305 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4306 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4307 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4310 return FALSE; /* should not happen */
4314 /* Expand a named list. Return false on failure. */
4316 expand_listnamed(gstring * yield, const uschar * name, const uschar * listtype)
4318 tree_node *t = NULL;
4319 const uschar * list;
4322 BOOL needsep = FALSE;
4323 #define LISTNAMED_BUF_SIZE 256
4324 uschar b[LISTNAMED_BUF_SIZE];
4325 uschar * buffer = b;
4327 if (*name == '+') name++;
4328 if (!listtype) /* no-argument version */
4330 if ( !(t = tree_search(addresslist_anchor, name))
4331 && !(t = tree_search(domainlist_anchor, name))
4332 && !(t = tree_search(hostlist_anchor, name)))
4333 t = tree_search(localpartlist_anchor, name);
4335 else switch(*listtype) /* specific list-type version */
4337 case 'a': t = tree_search(addresslist_anchor, name); break;
4338 case 'd': t = tree_search(domainlist_anchor, name); break;
4339 case 'h': t = tree_search(hostlist_anchor, name); break;
4340 case 'l': t = tree_search(localpartlist_anchor, name); break;
4342 expand_string_message = US"bad suffix on \"list\" operator";
4348 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
4350 : *listtype=='a'?"address "
4351 : *listtype=='d'?"domain "
4352 : *listtype=='h'?"host "
4353 : *listtype=='l'?"localpart "
4358 list = ((namedlist_block *)(t->data.ptr))->string;
4360 /* The list could be quite long so we (re)use a buffer for each element
4361 rather than getting each in new memory */
4363 if (is_tainted(list)) buffer = store_get(LISTNAMED_BUF_SIZE, TRUE);
4364 while ((item = string_nextinlist(&list, &sep, buffer, LISTNAMED_BUF_SIZE)))
4366 uschar * buf = US" : ";
4368 yield = string_catn(yield, buf, 3);
4372 if (*item == '+') /* list item is itself a named list */
4374 yield = expand_listnamed(yield, item, listtype);
4375 if (expand_string_message)
4379 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
4382 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
4384 for(char * cp; cp = strpbrk(CCS item, tok); item = US cp)
4386 yield = string_catn(yield, item, cp - CS item);
4387 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
4388 yield = string_catn(yield, US"::", 2);
4389 else /* sep in item; should already be doubled; emit once */
4391 yield = string_catn(yield, US tok, 1);
4392 if (*cp == sep) cp++;
4395 yield = string_cat(yield, item);
4398 yield = string_cat(yield, item);
4405 /*************************************************
4407 *************************************************/
4409 /* Returns either an unchanged string, or the expanded string in stacking pool
4410 store. Interpreted sequences are:
4412 \... normal escaping rules
4413 $name substitutes the variable
4415 ${op:string} operates on the expanded string value
4416 ${item{arg1}{arg2}...} expands the args and then does the business
4417 some literal args are not enclosed in {}
4419 There are now far too many operators and item types to make it worth listing
4420 them here in detail any more.
4422 We use an internal routine recursively to handle embedded substrings. The
4423 external function follows. The yield is NULL if the expansion failed, and there
4424 are two cases: if something collapsed syntactically, or if "fail" was given
4425 as the action on a lookup failure. These can be distinguished by looking at the
4426 variable expand_string_forcedfail, which is TRUE in the latter case.
4428 The skipping flag is set true when expanding a substring that isn't actually
4429 going to be used (after "if" or "lookup") and it prevents lookups from
4430 happening lower down.
4432 Store usage: At start, a store block of the length of the input plus 64
4433 is obtained. This is expanded as necessary by string_cat(), which might have to
4434 get a new block, or might be able to expand the original. At the end of the
4435 function we can release any store above that portion of the yield block that
4436 was actually used. In many cases this will be optimal.
4438 However: if the first item in the expansion is a variable name or header name,
4439 we reset the store before processing it; if the result is in fresh store, we
4440 use that without copying. This is helpful for expanding strings like
4441 $message_headers which can get very long.
4443 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4444 since resetting the store at the end of the expansion will free store that was
4445 allocated by the plugin code as well as the slop after the expanded string. So
4446 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4447 and, given the acl condition, ${if }. This is an unfortunate consequence of
4448 string expansion becoming too powerful.
4451 string the string to be expanded
4452 ket_ends true if expansion is to stop at }
4453 left if not NULL, a pointer to the first character after the
4454 expansion is placed here (typically used with ket_ends)
4455 skipping TRUE for recursive calls when the value isn't actually going
4456 to be used (to allow for optimisation)
4457 honour_dollar TRUE if $ is to be expanded,
4458 FALSE if it's just another character
4459 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4462 Returns: NULL if expansion fails:
4463 expand_string_forcedfail is set TRUE if failure was forced
4464 expand_string_message contains a textual error message
4465 a pointer to the expanded string on success
4469 expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left,
4470 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p)
4472 rmark reset_point = store_mark();
4473 gstring * yield = string_get(Ustrlen(string) + 64);
4475 const uschar *s = string;
4476 const uschar *save_expand_nstring[EXPAND_MAXN+1];
4477 int save_expand_nlength[EXPAND_MAXN+1];
4478 BOOL resetok = TRUE;
4483 debug_printf_indent("/%s: %s\n",
4484 skipping ? "---scanning" : "considering", string);
4486 debug_printf_indent(UTF8_DOWN_RIGHT "%s: %s\n",
4488 ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning"
4492 f.expand_string_forcedfail = FALSE;
4493 expand_string_message = US"";
4496 if ((m = is_tainted2(string, LOG_MAIN|LOG_PANIC, "Tainted string '%s' in expansion", s)))
4498 expand_string_message = m;
4507 /* \ escapes the next character, which must exist, or else
4508 the expansion fails. There's a special escape, \N, which causes
4509 copying of the subject verbatim up to the next \N. Otherwise,
4510 the escapes are the standard set. */
4516 expand_string_message = US"\\ at end of string";
4522 const uschar * t = s + 2;
4523 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
4524 yield = string_catn(yield, t, s - t);
4525 if (*s != 0) s += 2;
4531 ch[0] = string_interpret_escape(&s);
4533 yield = string_catn(yield, ch, 1);
4540 /* Anything other than $ is just copied verbatim, unless we are
4541 looking for a terminating } character. */
4544 if (ket_ends && *s == '}') break;
4546 if (*s != '$' || !honour_dollar)
4548 yield = string_catn(yield, s++, 1);
4552 /* No { after the $ - must be a plain name or a number for string
4553 match variable. There has to be a fudge for variables that are the
4554 names of header fields preceded by "$header_" because header field
4555 names can contain any printing characters except space and colon.
4556 For those that don't like typing this much, "$h_" is a synonym for
4557 "$header_". A non-existent header yields a NULL value; nothing is
4560 if (isalpha((*(++s))))
4562 const uschar * value;
4568 s = read_name(name, sizeof(name), s, US"_");
4570 /* If this is the first thing to be expanded, release the pre-allocated
4574 g = store_get(sizeof(gstring), FALSE);
4575 else if (yield->ptr == 0)
4577 if (resetok) reset_point = store_reset(reset_point);
4579 reset_point = store_mark();
4580 g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */
4585 if ( ( *(t = name) == 'h'
4586 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4588 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4591 unsigned flags = *name == 'r' ? FH_WANT_RAW
4592 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4594 const uschar * charset = *name == 'b' ? NULL : headers_charset;
4596 s = read_header_name(name, sizeof(name), s);
4597 value = find_header(name, &newsize, flags, charset);
4599 /* If we didn't find the header, and the header contains a closing brace
4600 character, this may be a user error where the terminating colon
4601 has been omitted. Set a flag to adjust the error message in this case.
4602 But there is no error here - nothing gets inserted. */
4606 if (Ustrchr(name, '}')) malformed_header = TRUE;
4613 else if (!(value = find_variable(name, FALSE, skipping, &newsize)))
4615 expand_string_message =
4616 string_sprintf("unknown variable name \"%s\"", name);
4617 check_variable_error_message(name);
4621 /* If the data is known to be in a new buffer, newsize will be set to the
4622 size of that buffer. If this is the first thing in an expansion string,
4623 yield will be NULL; just point it at the new store instead of copying. Many
4624 expansion strings contain just one reference, so this is a useful
4625 optimization, especially for humungous headers. We need to use a gstring
4626 structure that is not allocated after that new-buffer, else a later store
4627 reset in the middle of the buffer will make it inaccessible. */
4629 len = Ustrlen(value);
4630 if (!yield && newsize != 0)
4633 yield->size = newsize;
4635 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
4638 yield = string_catn(yield, value, len);
4646 s = read_cnumber(&n, s);
4647 if (n >= 0 && n <= expand_nmax)
4648 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4652 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4654 if (*s != '{') /*}*/
4656 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4660 /* After { there can be various things, but they all start with
4661 an initial word, except for a number for a string match variable. */
4663 if (isdigit((*(++s))))
4666 s = read_cnumber(&n, s); /*{*/
4669 expand_string_message = US"} expected after number";
4672 if (n >= 0 && n <= expand_nmax)
4673 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4679 expand_string_message = US"letter or digit expected after ${"; /*}*/
4683 /* Allow "-" in names to cater for substrings with negative
4684 arguments. Since we are checking for known names after { this is
4687 s = read_name(name, sizeof(name), s, US"_-");
4688 item_type = chop_match(name, item_table, nelem(item_table));
4692 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4693 If the ACL returns accept or reject we return content set by "message ="
4694 There is currently no limit on recursion; this would have us call
4695 acl_check_internal() directly and get a current level from somewhere.
4696 See also the acl expansion condition ECOND_ACL and the traditional
4697 acl modifier ACLC_ACL.
4698 Assume that the function has side-effects on the store that must be preserved.
4702 /* ${acl {name} {arg1}{arg2}...} */
4704 uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4708 switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, name,
4711 case 1: goto EXPAND_FAILED_CURLY;
4713 case 3: goto EXPAND_FAILED;
4715 if (skipping) continue;
4718 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4723 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4725 yield = string_cat(yield, user_msg);
4729 f.expand_string_forcedfail = TRUE;
4732 expand_string_message = string_sprintf("%s from acl \"%s\"",
4733 rc_names[rc], sub[0]);
4738 case EITEM_AUTHRESULTS:
4739 /* ${authresults {mysystemname}} */
4743 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4746 case 1: goto EXPAND_FAILED_CURLY;
4748 case 3: goto EXPAND_FAILED;
4751 yield = string_append(yield, 3,
4752 US"Authentication-Results: ", sub_arg[0], US"; none");
4755 yield = authres_local(yield, sub_arg[0]);
4756 yield = authres_iprev(yield);
4757 yield = authres_smtpauth(yield);
4759 yield = authres_spf(yield);
4761 #ifndef DISABLE_DKIM
4762 yield = authres_dkim(yield);
4764 #ifdef SUPPORT_DMARC
4765 yield = authres_dmarc(yield);
4767 #ifdef EXPERIMENTAL_ARC
4768 yield = authres_arc(yield);
4773 /* Handle conditionals - preserve the values of the numerical expansion
4774 variables in case they get changed by a regular expression match in the
4775 condition. If not, they retain their external settings. At the end
4776 of this "if" section, they get restored to their previous values. */
4781 const uschar *next_s;
4782 int save_expand_nmax =
4783 save_expand_strings(save_expand_nstring, save_expand_nlength);
4785 Uskip_whitespace(&s);
4786 if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond)))
4787 goto EXPAND_FAILED; /* message already set */
4792 debug_printf_indent("|--condition: %.*s\n", (int)(next_s - s), s);
4793 debug_printf_indent("|-----result: %s\n", cond ? "true" : "false");
4797 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4798 "condition: %.*s\n",
4799 (int)(next_s - s), s);
4800 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4801 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
4803 cond ? "true" : "false");
4808 /* The handling of "yes" and "no" result strings is now in a separate
4809 function that is also used by ${lookup} and ${extract} and ${run}. */
4811 switch(process_yesno(
4812 skipping, /* were previously skipping */
4813 cond, /* success/failure indicator */
4814 lookup_value, /* value to reset for string2 */
4815 &s, /* input pointer */
4816 &yield, /* output pointer */
4817 US"if", /* condition type */
4820 case 1: goto EXPAND_FAILED; /* when all is well, the */
4821 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4824 /* Restore external setting of expansion variables for continuation
4827 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4828 save_expand_nlength);
4833 case EITEM_IMAPFOLDER:
4834 { /* ${imapfolder {name}{sep]{specials}} */
4838 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4841 case 1: goto EXPAND_FAILED_CURLY;
4843 case 3: goto EXPAND_FAILED;
4846 if (!sub_arg[1]) /* One argument */
4848 sub_arg[1] = US"/"; /* default separator */
4851 else if (Ustrlen(sub_arg[1]) != 1)
4853 expand_string_message =
4855 "IMAP folder separator must be one character, found \"%s\"",
4862 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4863 sub_arg[1][0], sub_arg[2], &expand_string_message)))
4865 yield = string_cat(yield, encoded);
4871 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
4872 expanding an internal string that isn't actually going to be used. All we
4873 need to do is check the syntax, so don't do a lookup at all. Preserve the
4874 values of the numerical expansion variables in case they get changed by a
4875 partial lookup. If not, they retain their external settings. At the end
4876 of this "lookup" section, they get restored to their previous values. */
4880 int stype, partial, affixlen, starflags;
4881 int expand_setup = 0;
4883 uschar *key, *filename;
4884 const uschar * affix, * opts;
4885 uschar *save_lookup_value = lookup_value;
4886 int save_expand_nmax =
4887 save_expand_strings(save_expand_nstring, save_expand_nlength);
4889 if (expand_forbid & RDO_LOOKUP)
4891 expand_string_message = US"lookup expansions are not permitted";
4895 /* Get the key we are to look up for single-key+file style lookups.
4896 Otherwise set the key NULL pro-tem. */
4898 if (Uskip_whitespace(&s) == '{') /*}*/
4900 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4901 if (!key) goto EXPAND_FAILED; /*{{*/
4904 expand_string_message = US"missing '}' after lookup key";
4905 goto EXPAND_FAILED_CURLY;
4907 Uskip_whitespace(&s);
4911 /* Find out the type of database */
4915 expand_string_message = US"missing lookup type";
4919 /* The type is a string that may contain special characters of various
4920 kinds. Allow everything except space or { to appear; the actual content
4921 is checked by search_findtype_partial. */ /*}*/
4923 while (*s && *s != '{' && !isspace(*s)) /*}*/
4925 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
4928 name[nameptr] = '\0';
4929 Uskip_whitespace(&s);
4931 /* Now check for the individual search type and any partial or default
4932 options. Only those types that are actually in the binary are valid. */
4934 if ((stype = search_findtype_partial(name, &partial, &affix, &affixlen,
4935 &starflags, &opts)) < 0)
4937 expand_string_message = search_error_message;
4941 /* Check that a key was provided for those lookup types that need it,
4942 and was not supplied for those that use the query style. */
4944 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
4948 expand_string_message = string_sprintf("missing {key} for single-"
4949 "key \"%s\" lookup", name);
4957 expand_string_message = string_sprintf("a single key was given for "
4958 "lookup type \"%s\", which is not a single-key lookup type", name);
4963 /* Get the next string in brackets and expand it. It is the file name for
4964 single-key+file lookups, and the whole query otherwise. In the case of
4965 queries that also require a file name (e.g. sqlite), the file name comes
4970 expand_string_message = US"missing '{' for lookup file-or-query arg";
4971 goto EXPAND_FAILED_CURLY;
4973 if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
4977 expand_string_message = US"missing '}' closing lookup file-or-query arg";
4978 goto EXPAND_FAILED_CURLY;
4980 Uskip_whitespace(&s);
4982 /* If this isn't a single-key+file lookup, re-arrange the variables
4983 to be appropriate for the search_ functions. For query-style lookups,
4984 there is just a "key", and no file name. For the special query-style +
4985 file types, the query (i.e. "key") starts with a file name. */
4988 key = search_args(stype, name, filename, &filename, opts);
4990 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4991 the entry was not found. Note that there is no search_close() function.
4992 Files are left open in case of re-use. At suitable places in higher logic,
4993 search_tidyup() is called to tidy all open files. This can save opening
4994 the same file several times. However, files may also get closed when
4995 others are opened, if too many are open at once. The rule is that a
4996 handle should not be used after a second search_open().
4998 Request that a partial search sets up $1 and maybe $2 by passing
4999 expand_setup containing zero. If its value changes, reset expand_nmax,
5000 since new variables will have been set. Note that at the end of this
5001 "lookup" section, the old numeric variables are restored. */
5004 lookup_value = NULL;
5007 void *handle = search_open(filename, stype, 0, NULL, NULL);
5010 expand_string_message = search_error_message;
5013 lookup_value = search_find(handle, filename, key, partial, affix,
5014 affixlen, starflags, &expand_setup, opts);
5015 if (f.search_find_defer)
5017 expand_string_message =
5018 string_sprintf("lookup of \"%s\" gave DEFER: %s",
5019 string_printing2(key, SP_TAB), search_error_message);
5022 if (expand_setup > 0) expand_nmax = expand_setup;
5025 /* The handling of "yes" and "no" result strings is now in a separate
5026 function that is also used by ${if} and ${extract}. */
5028 switch(process_yesno(
5029 skipping, /* were previously skipping */
5030 lookup_value != NULL, /* success/failure indicator */
5031 save_lookup_value, /* value to reset for string2 */
5032 &s, /* input pointer */
5033 &yield, /* output pointer */
5034 US"lookup", /* condition type */
5037 case 1: goto EXPAND_FAILED; /* when all is well, the */
5038 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5041 /* Restore external setting of expansion variables for carrying on
5042 at this level, and continue. */
5044 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5045 save_expand_nlength);
5049 /* If Perl support is configured, handle calling embedded perl subroutines,
5050 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
5051 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
5052 arguments (defined below). */
5054 #define EXIM_PERL_MAX_ARGS 8
5058 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
5059 "is not included in this binary";
5062 #else /* EXIM_PERL */
5064 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
5067 if ((expand_forbid & RDO_PERL) != 0)
5069 expand_string_message = US"Perl calls are not permitted";
5073 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
5076 case 1: goto EXPAND_FAILED_CURLY;
5078 case 3: goto EXPAND_FAILED;
5081 /* If skipping, we don't actually do anything */
5083 if (skipping) continue;
5085 /* Start the interpreter if necessary */
5087 if (!opt_perl_started)
5090 if (!opt_perl_startup)
5092 expand_string_message = US"A setting of perl_startup is needed when "
5093 "using the Perl interpreter";
5096 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
5097 if ((initerror = init_perl(opt_perl_startup)))
5099 expand_string_message =
5100 string_sprintf("error in perl_startup code: %s\n", initerror);
5103 opt_perl_started = TRUE;
5106 /* Call the function */
5108 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
5109 new_yield = call_perl_cat(yield, &expand_string_message,
5110 sub_arg[0], sub_arg + 1);
5112 /* NULL yield indicates failure; if the message pointer has been set to
5113 NULL, the yield was undef, indicating a forced failure. Otherwise the
5114 message will indicate some kind of Perl error. */
5118 if (!expand_string_message)
5120 expand_string_message =
5121 string_sprintf("Perl subroutine \"%s\" returned undef to force "
5122 "failure", sub_arg[0]);
5123 f.expand_string_forcedfail = TRUE;
5128 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
5129 set during a callback from Perl. */
5131 f.expand_string_forcedfail = FALSE;
5135 #endif /* EXIM_PERL */
5137 /* Transform email address to "prvs" scheme to use
5138 as BATV-signed return path */
5145 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, name, &resetok))
5147 case 1: goto EXPAND_FAILED_CURLY;
5149 case 3: goto EXPAND_FAILED;
5152 /* If skipping, we don't actually do anything */
5153 if (skipping) continue;
5155 /* sub_arg[0] is the address */
5156 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5157 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5159 expand_string_message = US"prvs first argument must be a qualified email address";
5163 /* Calculate the hash. The third argument must be a single-digit
5164 key number, or unset. */
5167 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5169 expand_string_message = US"prvs third argument must be a single digit";
5173 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5176 expand_string_message = US"prvs hmac-sha1 conversion failed";
5180 /* Now separate the domain from the local part */
5183 yield = string_catn(yield, US"prvs=", 5);
5184 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5185 yield = string_catn(yield, prvs_daystamp(7), 3);
5186 yield = string_catn(yield, p, 6);
5187 yield = string_catn(yield, US"=", 1);
5188 yield = string_cat (yield, sub_arg[0]);
5189 yield = string_catn(yield, US"@", 1);
5190 yield = string_cat (yield, domain);
5195 /* Check a prvs-encoded address for validity */
5197 case EITEM_PRVSCHECK:
5201 const pcre2_code *re;
5204 /* TF: Ugliness: We want to expand parameter 1 first, then set
5205 up expansion variables that are used in the expansion of
5206 parameter 2. So we clone the string for the first
5207 expansion, where we only expand parameter 1.
5209 PH: Actually, that isn't necessary. The read_subs() function is
5210 designed to work this way for the ${if and ${lookup expansions. I've
5214 /* Reset expansion variables */
5215 prvscheck_result = NULL;
5216 prvscheck_address = NULL;
5217 prvscheck_keynum = NULL;
5219 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5221 case 1: goto EXPAND_FAILED_CURLY;
5223 case 3: goto EXPAND_FAILED;
5226 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5229 if (regex_match_and_setup(re,sub_arg[0],0,-1))
5231 uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
5232 uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
5233 uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
5234 uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]);
5235 uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]);
5237 DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part);
5238 DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num);
5239 DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5240 DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash);
5241 DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain);
5243 /* Set up expansion variables */
5244 g = string_cat (NULL, local_part);
5245 g = string_catn(g, US"@", 1);
5246 g = string_cat (g, domain);
5247 prvscheck_address = string_from_gstring(g);
5248 prvscheck_keynum = string_copy(key_num);
5250 /* Now expand the second argument */
5251 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5253 case 1: goto EXPAND_FAILED_CURLY;
5255 case 3: goto EXPAND_FAILED;
5258 /* Now we have the key and can check the address. */
5260 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5265 expand_string_message = US"hmac-sha1 conversion failed";
5269 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5270 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5272 if (Ustrcmp(p,hash) == 0)
5274 /* Success, valid BATV address. Now check the expiry date. */
5275 uschar *now = prvs_daystamp(0);
5276 unsigned int inow = 0,iexpire = 1;
5278 (void)sscanf(CS now,"%u",&inow);
5279 (void)sscanf(CS daystamp,"%u",&iexpire);
5281 /* When "iexpire" is < 7, a "flip" has occurred.
5282 Adjust "inow" accordingly. */
5283 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5285 if (iexpire >= inow)
5287 prvscheck_result = US"1";
5288 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n");
5292 prvscheck_result = NULL;
5293 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n");
5298 prvscheck_result = NULL;
5299 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n");
5302 /* Now expand the final argument. We leave this till now so that
5303 it can include $prvscheck_result. */
5305 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, name, &resetok))
5307 case 1: goto EXPAND_FAILED_CURLY;
5309 case 3: goto EXPAND_FAILED;
5312 yield = string_cat(yield,
5313 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5315 /* Reset the "internal" variables afterwards, because they are in
5316 dynamic store that will be reclaimed if the expansion succeeded. */
5318 prvscheck_address = NULL;
5319 prvscheck_keynum = NULL;
5322 /* Does not look like a prvs encoded address, return the empty string.
5323 We need to make sure all subs are expanded first, so as to skip over
5326 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5328 case 1: goto EXPAND_FAILED_CURLY;
5330 case 3: goto EXPAND_FAILED;
5336 /* Handle "readfile" to insert an entire file */
5338 case EITEM_READFILE:
5343 if ((expand_forbid & RDO_READFILE) != 0)
5345 expand_string_message = US"file insertions are not permitted";
5349 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5351 case 1: goto EXPAND_FAILED_CURLY;
5353 case 3: goto EXPAND_FAILED;
5356 /* If skipping, we don't actually do anything */
5358 if (skipping) continue;
5360 /* Open the file and read it */
5362 if (!(f = Ufopen(sub_arg[0], "rb")))
5364 expand_string_message = string_open_failed("%s", sub_arg[0]);
5368 yield = cat_file(f, yield, sub_arg[1]);
5373 /* Handle "readsocket" to insert data from a socket, either
5374 Inet or Unix domain */
5376 case EITEM_READSOCK:
5379 uschar * sub_arg[4];
5381 if (expand_forbid & RDO_READSOCK)
5383 expand_string_message = US"socket insertions are not permitted";
5387 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5388 because there may be a string for expansion on failure. */
5390 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, name, &resetok))
5392 case 1: goto EXPAND_FAILED_CURLY;
5393 case 2: /* Won't occur: no end check */
5394 case 3: goto EXPAND_FAILED;
5397 /* If skipping, we don't actually do anything. Otherwise, arrange to
5398 connect to either an IP or a Unix socket. */
5402 int stype = search_findtype(US"readsock", 8);
5405 int expand_setup = -1;
5408 /* If the reqstr is empty, flag that and set a dummy */
5412 g = string_append_listele(g, ',', US"send=no");
5413 sub_arg[1] = US"DUMMY";
5416 /* Re-marshall the options */
5420 const uschar * list = sub_arg[2];
5424 /* First option has no tag and is timeout */
5425 if ((item = string_nextinlist(&list, &sep, NULL, 0)))
5426 g = string_append_listele(g, ',',
5427 string_sprintf("timeout=%s", item));
5429 /* The rest of the options from the expansion */
5430 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5431 g = string_append_listele(g, ',', item);
5433 /* possibly plus an EOL string. Process with escapes, to protect
5434 from list-processing. The only current user of eol= in search
5435 options is the readsock expansion. */
5437 if (sub_arg[3] && *sub_arg[3])
5438 g = string_append_listele(g, ',',
5439 string_sprintf("eol=%s",
5440 string_printing2(sub_arg[3], SP_TAB|SP_SPACE)));
5443 /* Gat a (possibly cached) handle for the connection */
5445 if (!(handle = search_open(sub_arg[0], stype, 0, NULL, NULL)))
5447 if (*expand_string_message) goto EXPAND_FAILED;
5448 expand_string_message = search_error_message;
5449 search_error_message = NULL;
5453 /* Get (possibly cached) results for the lookup */
5454 /* sspec: sub_arg[0] req: sub_arg[1] opts: g */
5456 if ((s = search_find(handle, sub_arg[0], sub_arg[1], -1, NULL, 0, 0,
5457 &expand_setup, string_from_gstring(g))))
5458 yield = string_cat(yield, s);
5459 else if (f.search_find_defer)
5461 expand_string_message = search_error_message;
5462 search_error_message = NULL;
5466 { /* should not happen, at present */
5467 expand_string_message = search_error_message;
5468 search_error_message = NULL;
5473 /* The whole thing has worked (or we were skipping). If there is a
5474 failure string following, we need to skip it. */
5478 if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok))
5482 expand_string_message = US"missing '}' closing failstring for readsocket";
5483 goto EXPAND_FAILED_CURLY;
5485 Uskip_whitespace(&s);
5491 expand_string_message = US"missing '}' closing readsocket";
5492 goto EXPAND_FAILED_CURLY;
5496 /* Come here on failure to create socket, connect socket, write to the
5497 socket, or timeout on reading. If another substring follows, expand and
5498 use it. Otherwise, those conditions give expand errors. */
5501 if (*s != '{') goto EXPAND_FAILED;
5502 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5503 if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok)))
5505 yield = string_cat(yield, arg);
5508 expand_string_message = US"missing '}' closing failstring for readsocket";
5509 goto EXPAND_FAILED_CURLY;
5511 Uskip_whitespace(&s);
5515 /* Handle "run" to execute a program. */
5521 const uschar **argv;
5525 if ((expand_forbid & RDO_RUN) != 0)
5527 expand_string_message = US"running a command is not permitted";
5531 Uskip_whitespace(&s);
5534 expand_string_message = US"missing '{' for command arg of run";
5535 goto EXPAND_FAILED_CURLY;
5537 if (!(arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
5539 Uskip_whitespace(&s);
5542 expand_string_message = US"missing '}' closing command arg of run";
5543 goto EXPAND_FAILED_CURLY;
5546 if (skipping) /* Just pretend it worked when we're skipping */
5549 lookup_value = NULL;
5553 if (!transport_set_up_command(&argv, /* anchor for arg list */
5554 arg, /* raw command */
5555 FALSE, /* don't expand the arguments */
5556 0, /* not relevant when... */
5557 NULL, /* no transporting address */
5558 US"${run} expansion", /* for error messages */
5559 &expand_string_message)) /* where to put error message */
5562 /* Create the child process, making it a group leader. */
5564 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5565 US"expand-run")) < 0)
5567 expand_string_message =
5568 string_sprintf("couldn't create child process: %s", strerror(errno));
5572 /* Nothing is written to the standard input. */
5576 /* Read the pipe to get the command's output into $value (which is kept
5577 in lookup_value). Read during execution, so that if the output exceeds
5578 the OS pipe buffer limit, we don't block forever. Remember to not release
5579 memory just allocated for $value. */
5582 f = fdopen(fd_out, "rb");
5583 sigalrm_seen = FALSE;
5585 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5589 /* Wait for the process to finish, applying the timeout, and inspect its
5590 return code for serious disasters. Simple non-zero returns are passed on.
5593 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5595 if (sigalrm_seen || runrc == -256)
5597 expand_string_message = US"command timed out";
5598 killpg(pid, SIGKILL); /* Kill the whole process group */
5601 else if (runrc == -257)
5602 expand_string_message = string_sprintf("wait() failed: %s",
5606 expand_string_message = string_sprintf("command killed by signal %d",
5613 /* Process the yes/no strings; $value may be useful in both cases */
5615 switch(process_yesno(
5616 skipping, /* were previously skipping */
5617 runrc == 0, /* success/failure indicator */
5618 lookup_value, /* value to reset for string2 */
5619 &s, /* input pointer */
5620 &yield, /* output pointer */
5621 US"run", /* condition type */
5624 case 1: goto EXPAND_FAILED; /* when all is well, the */
5625 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5631 /* Handle character translation for "tr" */
5635 int oldptr = gstring_length(yield);
5639 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5641 case 1: goto EXPAND_FAILED_CURLY;
5643 case 3: goto EXPAND_FAILED;
5646 yield = string_cat(yield, sub[0]);
5647 o2m = Ustrlen(sub[2]) - 1;
5649 if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++)
5651 uschar *m = Ustrrchr(sub[1], yield->s[oldptr]);
5655 yield->s[oldptr] = sub[2][(o < o2m)? o : o2m];
5662 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5663 expanded arguments. */
5672 int val[2] = { 0, -1 };
5675 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5676 Ensure that sub[2] is set in the ${length } case. */
5679 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
5680 TRUE, name, &resetok))
5682 case 1: goto EXPAND_FAILED_CURLY;
5684 case 3: goto EXPAND_FAILED;
5687 /* Juggle the arguments if there are only two of them: always move the
5688 string to the last position and make ${length{n}{str}} equivalent to
5689 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5695 if (item_type == EITEM_LENGTH)
5702 for (int i = 0; i < 2; i++) if (sub[i])
5704 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5705 if (*ret != 0 || (i != 0 && val[i] < 0))
5707 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5708 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5714 item_type == EITEM_HASH
5715 ? compute_hash(sub[2], val[0], val[1], &len)
5716 : item_type == EITEM_NHASH
5717 ? compute_nhash(sub[2], val[0], val[1], &len)
5718 : extract_substr(sub[2], val[0], val[1], &len);
5721 yield = string_catn(yield, ret, len);
5725 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5726 This code originally contributed by Steve Haslam. It currently supports
5727 the use of MD5 and SHA-1 hashes.
5729 We need some workspace that is large enough to handle all the supported
5730 hash types. Use macros to set the sizes rather than be too elaborate. */
5732 #define MAX_HASHLEN 20
5733 #define MAX_HASHBLOCKLEN 64
5742 int hashlen; /* Number of octets for the hash algorithm's output */
5743 int hashblocklen; /* Number of octets the hash algorithm processes */
5745 unsigned int keylen;
5747 uschar keyhash[MAX_HASHLEN];
5748 uschar innerhash[MAX_HASHLEN];
5749 uschar finalhash[MAX_HASHLEN];
5750 uschar finalhash_hex[2*MAX_HASHLEN];
5751 uschar innerkey[MAX_HASHBLOCKLEN];
5752 uschar outerkey[MAX_HASHBLOCKLEN];
5754 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5756 case 1: goto EXPAND_FAILED_CURLY;
5758 case 3: goto EXPAND_FAILED;
5763 if (Ustrcmp(sub[0], "md5") == 0)
5766 use_base = &md5_base;
5770 else if (Ustrcmp(sub[0], "sha1") == 0)
5773 use_base = &sha1_ctx;
5779 expand_string_message =
5780 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5785 keylen = Ustrlen(keyptr);
5787 /* If the key is longer than the hash block length, then hash the key
5790 if (keylen > hashblocklen)
5792 chash_start(type, use_base);
5793 chash_end(type, use_base, keyptr, keylen, keyhash);
5798 /* Now make the inner and outer key values */
5800 memset(innerkey, 0x36, hashblocklen);
5801 memset(outerkey, 0x5c, hashblocklen);
5803 for (int i = 0; i < keylen; i++)
5805 innerkey[i] ^= keyptr[i];
5806 outerkey[i] ^= keyptr[i];
5809 /* Now do the hashes */
5811 chash_start(type, use_base);
5812 chash_mid(type, use_base, innerkey);
5813 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5815 chash_start(type, use_base);
5816 chash_mid(type, use_base, outerkey);
5817 chash_end(type, use_base, innerhash, hashlen, finalhash);
5819 /* Encode the final hash as a hex string */
5822 for (int i = 0; i < hashlen; i++)
5824 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5825 *p++ = hex_digits[finalhash[i] & 0x0f];
5828 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5829 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5831 yield = string_catn(yield, finalhash_hex, hashlen*2);
5836 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5837 We have to save the numerical variables and restore them afterwards. */
5841 const pcre2_code * re;
5842 int moffset, moffsetextra, slen;
5844 pcre2_match_data * md;
5848 int save_expand_nmax =
5849 save_expand_strings(save_expand_nstring, save_expand_nlength);
5851 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5853 case 1: goto EXPAND_FAILED_CURLY;
5855 case 3: goto EXPAND_FAILED;
5858 /* Compile the regular expression */
5860 if (!(re = pcre2_compile((PCRE2_SPTR)sub[1], PCRE2_ZERO_TERMINATED,
5861 PCRE_COPT, &err, &roffset, pcre_cmp_ctx)))
5864 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
5865 expand_string_message = string_sprintf("regular expression error in "
5866 "\"%s\": %s at offset %ld", sub[1], errbuf, (long)roffset);
5869 md = pcre2_match_data_create(EXPAND_MAXN + 1, pcre_gen_ctx);
5871 /* Now run a loop to do the substitutions as often as necessary. It ends
5872 when there are no more matches. Take care over matches of the null string;
5873 do the same thing as Perl does. */
5876 slen = Ustrlen(sub[0]);
5877 moffset = moffsetextra = 0;
5882 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
5883 int n = pcre2_match(re, (PCRE2_SPTR)subject, slen, moffset + moffsetextra,
5884 PCRE_EOPT | emptyopt, md, pcre_mtc_ctx);
5887 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5888 is not necessarily the end. We want to repeat the match from one
5889 character further along, but leaving the basic offset the same (for
5890 copying below). We can't be at the end of the string - that was checked
5891 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5892 finished; copy the remaining string and end the loop. */
5902 yield = string_catn(yield, subject+moffset, slen-moffset);
5906 /* Match - set up for expanding the replacement. */
5908 if (n == 0) n = EXPAND_MAXN + 1;
5910 for (int nn = 0; nn < n*2; nn += 2)
5912 expand_nstring[expand_nmax] = subject + ovec[nn];
5913 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
5917 /* Copy the characters before the match, plus the expanded insertion. */
5919 yield = string_catn(yield, subject + moffset, ovec[0] - moffset);
5920 if (!(insert = expand_string(sub[2])))
5922 yield = string_cat(yield, insert);
5928 /* If we have matched an empty string, first check to see if we are at
5929 the end of the subject. If so, the loop is over. Otherwise, mimic
5930 what Perl's /g options does. This turns out to be rather cunning. First
5931 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5932 string at the same point. If this fails (picked up above) we advance to
5933 the next character. */
5935 if (ovec[0] == ovec[1])
5937 if (ovec[0] == slen) break;
5938 emptyopt = PCRE2_NOTEMPTY | PCRE2_ANCHORED;
5942 /* All done - restore numerical variables. */
5944 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5945 save_expand_nlength);
5949 /* Handle keyed and numbered substring extraction. If the first argument
5950 consists entirely of digits, then a numerical extraction is assumed. */
5954 int field_number = 1;
5955 BOOL field_number_set = FALSE;
5956 uschar *save_lookup_value = lookup_value;
5958 int save_expand_nmax =
5959 save_expand_strings(save_expand_nstring, save_expand_nlength);
5961 /* On reflection the original behaviour of extract-json for a string
5962 result, leaving it quoted, was a mistake. But it was already published,
5963 hence the addition of jsons. In a future major version, make json
5964 work like josons, and withdraw jsons. */
5966 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
5968 /* Check for a format-variant specifier */
5970 if (Uskip_whitespace(&s) != '{') /*}*/
5971 if (Ustrncmp(s, "json", 4) == 0)
5972 if (*(s += 4) == 's')
5973 {fmt = extract_jsons; s++;}
5977 /* While skipping we cannot rely on the data for expansions being
5978 available (eg. $item) hence cannot decide on numeric vs. keyed.
5979 Read a maximum of 5 arguments (including the yes/no) */
5983 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
5985 if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))
5986 goto EXPAND_FAILED; /*'{'*/
5989 expand_string_message = US"missing '{' for arg of extract";
5990 goto EXPAND_FAILED_CURLY;
5992 Uskip_whitespace(&s);
5994 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
5995 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
5999 Uskip_whitespace(&s);
6003 expand_string_message = US"missing '}' closing extract";
6004 goto EXPAND_FAILED_CURLY;
6008 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6010 if (Uskip_whitespace(&s) == '{') /*'}'*/
6012 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
6013 goto EXPAND_FAILED; /*'{'*/
6016 expand_string_message = string_sprintf(
6017 "missing '}' closing arg %d of extract", i+1);
6018 goto EXPAND_FAILED_CURLY;
6021 /* After removal of leading and trailing white space, the first
6022 argument must not be empty; if it consists entirely of digits
6023 (optionally preceded by a minus sign), this is a numerical
6024 extraction, and we expect 3 arguments (normal) or 2 (json). */
6032 Uskip_whitespace(&p);
6036 while (len > 0 && isspace(p[len-1])) len--;
6041 expand_string_message = US"first argument of \"extract\" must "
6051 while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0';
6055 if (fmt == extract_basic) j = 3; /* Need 3 args */
6056 field_number_set = TRUE;
6062 expand_string_message = string_sprintf(
6063 "missing '{' for arg %d of extract", i+1);
6064 goto EXPAND_FAILED_CURLY;
6068 /* Extract either the numbered or the keyed substring into $value. If
6069 skipping, just pretend the extraction failed. */
6072 lookup_value = NULL;
6076 lookup_value = field_number_set
6077 ? expand_gettokened(field_number, sub[1], sub[2])
6078 : expand_getkeyed(sub[0], sub[1]);
6085 const uschar * list;
6087 /* Array: Bracket-enclosed and comma-separated.
6088 Object: Brace-enclosed, comma-sep list of name:value pairs */
6090 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6092 expand_string_message =
6093 string_sprintf("%s wrapping %s for extract json",
6094 expand_string_message,
6095 field_number_set ? "array" : "object");
6096 goto EXPAND_FAILED_CURLY;
6100 if (field_number_set)
6102 if (field_number <= 0)
6104 expand_string_message = US"first argument of \"extract\" must "
6105 "be greater than zero";
6108 while (field_number > 0 && (item = json_nextinlist(&list)))
6110 if ((lookup_value = s = item))
6113 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6118 lookup_value = NULL;
6119 while ((item = json_nextinlist(&list)))
6121 /* Item is: string name-sep value. string is quoted.
6122 Dequote the string and compare with the search key. */
6124 if (!(item = dewrap(item, US"\"\"")))
6126 expand_string_message =
6127 string_sprintf("%s wrapping string key for extract json",
6128 expand_string_message);
6129 goto EXPAND_FAILED_CURLY;
6131 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6133 s = item + Ustrlen(item) + 1;
6134 if (Uskip_whitespace(&s) != ':')
6136 expand_string_message =
6137 US"missing object value-separator for extract json";
6138 goto EXPAND_FAILED_CURLY;
6141 Uskip_whitespace(&s);
6149 if ( fmt == extract_jsons
6151 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6153 expand_string_message =
6154 string_sprintf("%s wrapping string result for extract jsons",
6155 expand_string_message);
6156 goto EXPAND_FAILED_CURLY;
6161 /* If no string follows, $value gets substituted; otherwise there can
6162 be yes/no strings, as for lookup or if. */
6164 switch(process_yesno(
6165 skipping, /* were previously skipping */
6166 lookup_value != NULL, /* success/failure indicator */
6167 save_lookup_value, /* value to reset for string2 */
6168 &s, /* input pointer */
6169 &yield, /* output pointer */
6170 US"extract", /* condition type */
6173 case 1: goto EXPAND_FAILED; /* when all is well, the */
6174 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6177 /* All done - restore numerical variables. */
6179 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6180 save_expand_nlength);
6185 /* return the Nth item from a list */
6187 case EITEM_LISTEXTRACT:
6189 int field_number = 1;
6190 uschar *save_lookup_value = lookup_value;
6192 int save_expand_nmax =
6193 save_expand_strings(save_expand_nstring, save_expand_nlength);
6195 /* Read the field & list arguments */
6197 for (int i = 0; i < 2; i++)
6199 if (Uskip_whitespace(&s) != '{') /*'}'*/
6201 expand_string_message = string_sprintf(
6202 "missing '{' for arg %d of listextract", i+1);
6203 goto EXPAND_FAILED_CURLY;
6206 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6207 if (!sub[i]) goto EXPAND_FAILED; /*{*/
6210 expand_string_message = string_sprintf(
6211 "missing '}' closing arg %d of listextract", i+1);
6212 goto EXPAND_FAILED_CURLY;
6215 /* After removal of leading and trailing white space, the first
6216 argument must be numeric and nonempty. */
6224 Uskip_whitespace(&p);
6228 while (len > 0 && isspace(p[len-1])) len--;
6231 if (!*p && !skipping)
6233 expand_string_message = US"first argument of \"listextract\" must "
6243 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6246 expand_string_message = US"first argument of \"listextract\" must "
6254 /* Extract the numbered element into $value. If
6255 skipping, just pretend the extraction failed. */
6257 lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]);
6259 /* If no string follows, $value gets substituted; otherwise there can
6260 be yes/no strings, as for lookup or if. */
6262 switch(process_yesno(
6263 skipping, /* were previously skipping */
6264 lookup_value != NULL, /* success/failure indicator */
6265 save_lookup_value, /* value to reset for string2 */
6266 &s, /* input pointer */
6267 &yield, /* output pointer */
6268 US"listextract", /* condition type */
6271 case 1: goto EXPAND_FAILED; /* when all is well, the */
6272 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6275 /* All done - restore numerical variables. */
6277 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6278 save_expand_nlength);
6283 case EITEM_LISTQUOTE:
6286 switch(read_subs(sub, 2, 2, &s, skipping, TRUE, name, &resetok))
6288 case 1: goto EXPAND_FAILED_CURLY;
6290 case 3: goto EXPAND_FAILED;
6292 if (*sub[1]) for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6294 if (c == sep) yield = string_catn(yield, sub[1], 1);
6295 yield = string_catn(yield, sub[1], 1);
6297 else yield = string_catn(yield, US" ", 1);
6302 case EITEM_CERTEXTRACT:
6304 uschar *save_lookup_value = lookup_value;
6306 int save_expand_nmax =
6307 save_expand_strings(save_expand_nstring, save_expand_nlength);
6309 /* Read the field argument */
6310 if (Uskip_whitespace(&s) != '{') /*}*/
6312 expand_string_message = US"missing '{' for field arg of certextract";
6313 goto EXPAND_FAILED_CURLY;
6315 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6316 if (!sub[0]) goto EXPAND_FAILED; /*{*/
6319 expand_string_message = US"missing '}' closing field arg of certextract";
6320 goto EXPAND_FAILED_CURLY;
6322 /* strip spaces fore & aft */
6327 Uskip_whitespace(&p);
6331 while (len > 0 && isspace(p[len-1])) len--;
6335 /* inspect the cert argument */
6336 if (Uskip_whitespace(&s) != '{') /*}*/
6338 expand_string_message = US"missing '{' for cert variable arg of certextract";
6339 goto EXPAND_FAILED_CURLY;
6343 expand_string_message = US"second argument of \"certextract\" must "
6344 "be a certificate variable";
6347 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok);
6348 if (!sub[1]) goto EXPAND_FAILED; /*{*/
6351 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6352 goto EXPAND_FAILED_CURLY;
6356 lookup_value = NULL;
6359 lookup_value = expand_getcertele(sub[0], sub[1]);
6360 if (*expand_string_message) goto EXPAND_FAILED;
6362 switch(process_yesno(
6363 skipping, /* were previously skipping */
6364 lookup_value != NULL, /* success/failure indicator */
6365 save_lookup_value, /* value to reset for string2 */
6366 &s, /* input pointer */
6367 &yield, /* output pointer */
6368 US"certextract", /* condition type */
6371 case 1: goto EXPAND_FAILED; /* when all is well, the */
6372 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6375 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6376 save_expand_nlength);
6379 #endif /*DISABLE_TLS*/
6381 /* Handle list operations */
6388 int save_ptr = gstring_length(yield);
6389 uschar outsep[2] = { '\0', '\0' };
6390 const uschar *list, *expr, *temp;
6391 uschar *save_iterate_item = iterate_item;
6392 uschar *save_lookup_value = lookup_value;
6394 Uskip_whitespace(&s);
6397 expand_string_message =
6398 string_sprintf("missing '{' for first arg of %s", name);
6399 goto EXPAND_FAILED_CURLY;
6402 if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok)))
6406 expand_string_message =
6407 string_sprintf("missing '}' closing first arg of %s", name);
6408 goto EXPAND_FAILED_CURLY;
6411 if (item_type == EITEM_REDUCE)
6414 Uskip_whitespace(&s);
6417 expand_string_message = US"missing '{' for second arg of reduce";
6418 goto EXPAND_FAILED_CURLY;
6420 t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6421 if (!t) goto EXPAND_FAILED;
6425 expand_string_message = US"missing '}' closing second arg of reduce";
6426 goto EXPAND_FAILED_CURLY;
6430 Uskip_whitespace(&s);
6433 expand_string_message =
6434 string_sprintf("missing '{' for last arg of %s", name);
6435 goto EXPAND_FAILED_CURLY;
6440 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6441 if scanning a "false" part). This allows us to find the end of the
6442 condition, because if the list is empty, we won't actually evaluate the
6443 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6444 the normal internal expansion function. */
6446 if (item_type != EITEM_FILTER)
6447 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
6449 if ((temp = eval_condition(expr, &resetok, NULL))) s = temp;
6453 expand_string_message = string_sprintf("%s inside \"%s\" item",
6454 expand_string_message, name);
6458 Uskip_whitespace(&s); /*{*/
6461 expand_string_message = string_sprintf("missing } at end of condition "
6462 "or expression inside \"%s\"; could be an unquoted } in the content",
6467 Uskip_whitespace(&s); /*{*/
6470 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6475 /* If we are skipping, we can now just move on to the next item. When
6476 processing for real, we perform the iteration. */
6478 if (skipping) continue;
6479 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6481 *outsep = (uschar)sep; /* Separator as a string */
6483 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6484 name, iterate_item, lookup_value);
6486 if (item_type == EITEM_FILTER)
6489 if (!eval_condition(expr, &resetok, &condresult))
6491 iterate_item = save_iterate_item;
6492 lookup_value = save_lookup_value;
6493 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6494 expand_string_message, name);
6497 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6498 condresult? "true":"false");
6500 temp = iterate_item; /* TRUE => include this item */
6502 continue; /* FALSE => skip this item */
6505 /* EITEM_MAP and EITEM_REDUCE */
6509 uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok);
6513 iterate_item = save_iterate_item;
6514 expand_string_message = string_sprintf("%s inside \"%s\" item",
6515 expand_string_message, name);
6518 if (item_type == EITEM_REDUCE)
6520 lookup_value = t; /* Update the value of $value */
6521 continue; /* and continue the iteration */
6525 /* We reach here for FILTER if the condition is true, always for MAP,
6526 and never for REDUCE. The value in "temp" is to be added to the output
6527 list that is being created, ensuring that any occurrences of the
6528 separator character are doubled. Unless we are dealing with the first
6529 item of the output list, add in a space if the new item begins with the
6530 separator character, or is an empty string. */
6532 if ( yield && yield->ptr != save_ptr
6533 && (temp[0] == *outsep || temp[0] == 0))
6534 yield = string_catn(yield, US" ", 1);
6536 /* Add the string in "temp" to the output list that we are building,
6537 This is done in chunks by searching for the separator character. */
6541 size_t seglen = Ustrcspn(temp, outsep);
6543 yield = string_catn(yield, temp, seglen + 1);
6545 /* If we got to the end of the string we output one character
6546 too many; backup and end the loop. Otherwise arrange to double the
6549 if (temp[seglen] == '\0') { yield->ptr--; break; }
6550 yield = string_catn(yield, outsep, 1);
6554 /* Output a separator after the string: we will remove the redundant
6555 final one at the end. */
6557 yield = string_catn(yield, outsep, 1);
6558 } /* End of iteration over the list loop */
6560 /* REDUCE has generated no output above: output the final value of
6563 if (item_type == EITEM_REDUCE)
6565 yield = string_cat(yield, lookup_value);
6566 lookup_value = save_lookup_value; /* Restore $value */
6569 /* FILTER and MAP generate lists: if they have generated anything, remove
6570 the redundant final separator. Even though an empty item at the end of a
6571 list does not count, this is tidier. */
6573 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6575 /* Restore preserved $item */
6577 iterate_item = save_iterate_item;
6585 const uschar *srclist, *cmp, *xtract;
6586 uschar * opname, * srcitem;
6587 const uschar *dstlist = NULL, *dstkeylist = NULL;
6589 uschar *save_iterate_item = iterate_item;
6591 Uskip_whitespace(&s);
6594 expand_string_message = US"missing '{' for list arg of sort";
6595 goto EXPAND_FAILED_CURLY;
6598 srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6599 if (!srclist) goto EXPAND_FAILED;
6602 expand_string_message = US"missing '}' closing list arg of sort";
6603 goto EXPAND_FAILED_CURLY;
6606 Uskip_whitespace(&s);
6609 expand_string_message = US"missing '{' for comparator arg of sort";
6610 goto EXPAND_FAILED_CURLY;
6613 cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok);
6614 if (!cmp) goto EXPAND_FAILED;
6617 expand_string_message = US"missing '}' closing comparator arg of sort";
6618 goto EXPAND_FAILED_CURLY;
6621 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6623 if (!expand_string_message)
6624 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6629 case ECOND_NUM_L: case ECOND_NUM_LE:
6630 case ECOND_NUM_G: case ECOND_NUM_GE:
6631 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6632 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6636 expand_string_message = US"comparator not handled for sort";
6640 Uskip_whitespace(&s);
6643 expand_string_message = US"missing '{' for extractor arg of sort";
6644 goto EXPAND_FAILED_CURLY;
6648 if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok)))
6650 xtract = string_copyn(xtract, s - xtract);
6654 expand_string_message = US"missing '}' closing extractor arg of sort";
6655 goto EXPAND_FAILED_CURLY;
6660 expand_string_message = US"missing } at end of \"sort\"";
6664 if (skipping) continue;
6666 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6668 uschar * srcfield, * dstitem;
6669 gstring * newlist = NULL;
6670 gstring * newkeylist = NULL;
6672 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6674 /* extract field for comparisons */
6675 iterate_item = srcitem;
6676 if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE,
6680 expand_string_message = string_sprintf(
6681 "field-extract in sort: \"%s\"", xtract);
6685 /* Insertion sort */
6687 /* copy output list until new-item < list-item */
6688 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6692 /* field for comparison */
6693 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6696 /* String-comparator names start with a letter; numeric names do not */
6698 if (sortsbefore(cond_type, isalpha(opname[0]),
6699 srcfield, dstfield))
6701 /* New-item sorts before this dst-item. Append new-item,
6702 then dst-item, then remainder of dst list. */
6704 newlist = string_append_listele(newlist, sep, srcitem);
6705 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6708 newlist = string_append_listele(newlist, sep, dstitem);
6709 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6711 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6712 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6714 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6716 newlist = string_append_listele(newlist, sep, dstitem);
6717 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6723 newlist = string_append_listele(newlist, sep, dstitem);
6724 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6727 /* If we ran out of dstlist without consuming srcitem, append it */
6730 newlist = string_append_listele(newlist, sep, srcitem);
6731 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6734 dstlist = newlist->s;
6735 dstkeylist = newkeylist->s;
6737 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6738 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6742 yield = string_cat(yield, dstlist);
6744 /* Restore preserved $item */
6745 iterate_item = save_iterate_item;
6749 expand_string_message = US"Internal error in sort (list mismatch)";
6754 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6755 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6756 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6757 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6759 #define EXPAND_DLFUNC_MAX_ARGS 8
6762 #ifndef EXPAND_DLFUNC
6763 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6764 "is not included in this binary";
6767 #else /* EXPAND_DLFUNC */
6770 exim_dlfunc_t *func;
6773 uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6775 if ((expand_forbid & RDO_DLFUNC) != 0)
6777 expand_string_message =
6778 US"dynamically-loaded functions are not permitted";
6782 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
6783 TRUE, name, &resetok))
6785 case 1: goto EXPAND_FAILED_CURLY;
6787 case 3: goto EXPAND_FAILED;
6790 /* If skipping, we don't actually do anything */
6792 if (skipping) continue;
6794 /* Look up the dynamically loaded object handle in the tree. If it isn't
6795 found, dlopen() the file and put the handle in the tree for next time. */
6797 if (!(t = tree_search(dlobj_anchor, argv[0])))
6799 void *handle = dlopen(CS argv[0], RTLD_LAZY);
6802 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6803 argv[0], dlerror());
6804 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6807 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), is_tainted(argv[0]));
6808 Ustrcpy(t->name, argv[0]);
6809 t->data.ptr = handle;
6810 (void)tree_insertnode(&dlobj_anchor, t);
6813 /* Having obtained the dynamically loaded object handle, look up the
6814 function pointer. */
6816 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
6818 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6819 "%s", argv[1], argv[0], dlerror());
6820 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6824 /* Call the function and work out what to do with the result. If it
6825 returns OK, we have a replacement string; if it returns DEFER then
6826 expansion has failed in a non-forced manner; if it returns FAIL then
6827 failure was forced; if it returns ERROR or any other value there's a
6828 problem, so panic slightly. In any case, assume that the function has
6829 side-effects on the store that must be preserved. */
6833 for (argc = 0; argv[argc]; argc++);
6834 status = func(&result, argc - 2, &argv[2]);
6837 if (!result) result = US"";
6838 yield = string_cat(yield, result);
6843 expand_string_message = result ? result : US"(no message)";
6844 if (status == FAIL_FORCED)
6845 f.expand_string_forcedfail = TRUE;
6846 else if (status != FAIL)
6847 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
6848 argv[0], argv[1], status, expand_string_message);
6852 #endif /* EXPAND_DLFUNC */
6854 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
6857 uschar *save_lookup_value = lookup_value;
6859 if (Uskip_whitespace(&s) != '{') /*}*/
6862 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6863 if (!key) goto EXPAND_FAILED; /*{*/
6866 expand_string_message = US"missing '{' for name arg of env";
6867 goto EXPAND_FAILED_CURLY;
6870 lookup_value = US getenv(CS key);
6872 switch(process_yesno(
6873 skipping, /* were previously skipping */
6874 lookup_value != NULL, /* success/failure indicator */
6875 save_lookup_value, /* value to reset for string2 */
6876 &s, /* input pointer */
6877 &yield, /* output pointer */
6878 US"env", /* condition type */
6881 case 1: goto EXPAND_FAILED; /* when all is well, the */
6882 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6888 case EITEM_SRS_ENCODE:
6889 /* ${srs_encode {secret} {return_path} {orig_domain}} */
6894 BOOL quoted = FALSE;
6896 switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok))
6898 case 1: goto EXPAND_FAILED_CURLY;
6900 case 3: goto EXPAND_FAILED;
6903 g = string_catn(g, US"SRS0=", 5);
6905 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
6906 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
6907 g = string_catn(g, cksum, sizeof(cksum));
6908 g = string_catn(g, US"=", 1);
6910 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
6916 gettimeofday(&now, NULL);
6917 for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5)
6918 h = string_catn(h, &base32_chars[i & 0x1f], 1);
6919 if (h) while (h->ptr > 0)
6920 g = string_catn(g, &h->s[--h->ptr], 1);
6922 g = string_catn(g, US"=", 1);
6924 /* ${domain:$return_path}=${local_part:$return_path} */
6926 int start, end, domain;
6927 uschar * t = parse_extract_address(sub[1], &expand_string_message,
6928 &start, &end, &domain, FALSE);
6934 if (domain > 0) g = string_cat(g, t + domain);
6935 g = string_catn(g, US"=", 1);
6937 s = domain > 0 ? string_copyn(t, domain - 1) : t;
6938 if ((quoted = Ustrchr(s, '"') != NULL))
6941 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
6942 while (*s) /* de-quote */
6944 while (*s && *s != '"') h = string_catn(h, s++, 1);
6946 while (*s && *s != '"') h = string_catn(h, s++, 1);
6949 gstring_release_unused(h);
6950 s = string_from_gstring(h);
6952 g = string_cat(g, s);
6955 /* Assume that if the original local_part had quotes
6956 it was for good reason */
6958 if (quoted) yield = string_catn(yield, US"\"", 1);
6959 yield = string_catn(yield, g->s, g->ptr);
6960 if (quoted) yield = string_catn(yield, US"\"", 1);
6962 /* @$original_domain */
6963 yield = string_catn(yield, US"@", 1);
6964 yield = string_cat(yield, sub[2]);
6967 #endif /*SUPPORT_SRS*/
6968 } /* EITEM_* switch */
6970 /* Control reaches here if the name is not recognized as one of the more
6971 complicated expansion items. Check for the "operator" syntax (name terminated
6972 by a colon). Some of the operators have arguments, separated by _ from the
6981 var_entry *vp = NULL;
6984 /* Owing to an historical mis-design, an underscore may be part of the
6985 operator name, or it may introduce arguments. We therefore first scan the
6986 table of names that contain underscores. If there is no match, we cut off
6987 the arguments and then scan the main table. */
6989 if ((c = chop_match(name, op_table_underscore,
6990 nelem(op_table_underscore))) < 0)
6992 if ((arg = Ustrchr(name, '_')))
6994 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
6995 c += nelem(op_table_underscore);
6996 if (arg) *arg++ = '_'; /* Put back for error messages */
6999 /* Deal specially with operators that might take a certificate variable
7000 as we do not want to do the usual expansion. For most, expand the string.*/
7010 const uschar * s1 = s;
7011 sub = expand_string_internal(s+2, TRUE, &s1, skipping,
7013 if (!sub) goto EXPAND_FAILED; /*{*/
7016 expand_string_message =
7017 string_sprintf("missing '}' closing cert arg of %s", name);
7018 goto EXPAND_FAILED_CURLY;
7020 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
7030 sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
7031 if (!sub) goto EXPAND_FAILED;
7036 /* If we are skipping, we don't need to perform the operation at all.
7037 This matters for operations like "mask", because the data may not be
7038 in the correct format when skipping. For example, the expression may test
7039 for the existence of $sender_host_address before trying to mask it. For
7040 other operations, doing them may not fail, but it is a waste of time. */
7042 if (skipping && c >= 0) continue;
7044 /* Otherwise, switch on the operator type */
7051 unsigned long int n = Ustrtoul(sub, &t, 10);
7056 expand_string_message = string_sprintf("argument for base32 "
7057 "operator is \"%s\", which is not a decimal number", sub);
7061 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7063 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7070 unsigned long int n = 0;
7073 uschar * t = Ustrchr(base32_chars, *tt++);
7076 expand_string_message = string_sprintf("argument for base32d "
7077 "operator is \"%s\", which is not a base 32 number", sub);
7080 n = n * 32 + (t - base32_chars);
7082 yield = string_fmt_append(yield, "%ld", n);
7089 unsigned long int n = Ustrtoul(sub, &t, 10);
7092 expand_string_message = string_sprintf("argument for base62 "
7093 "operator is \"%s\", which is not a decimal number", sub);
7096 yield = string_cat(yield, string_base62(n));
7100 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7105 unsigned long int n = 0;
7108 uschar *t = Ustrchr(base62_chars, *tt++);
7111 expand_string_message = string_sprintf("argument for base62d "
7112 "operator is \"%s\", which is not a base %d number", sub,
7116 n = n * BASE_62 + (t - base62_chars);
7118 yield = string_fmt_append(yield, "%ld", n);
7124 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok);
7127 expand_string_message =
7128 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7129 expand_string_message);
7132 yield = string_cat(yield, expanded);
7139 uschar *t = sub - 1;
7140 while (*(++t) != 0) { *t = tolower(*t); count++; }
7141 yield = string_catn(yield, sub, count);
7148 uschar *t = sub - 1;
7149 while (*(++t) != 0) { *t = toupper(*t); count++; }
7150 yield = string_catn(yield, sub, count);
7156 if (vp && *(void **)vp->value)
7158 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7159 yield = string_cat(yield, cp);
7167 md5_end(&base, sub, Ustrlen(sub), digest);
7168 for (int j = 0; j < 16; j++)
7169 yield = string_fmt_append(yield, "%02x", digest[j]);
7175 if (vp && *(void **)vp->value)
7177 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7178 yield = string_cat(yield, cp);
7186 sha1_end(&h, sub, Ustrlen(sub), digest);
7187 for (int j = 0; j < 20; j++)
7188 yield = string_fmt_append(yield, "%02X", digest[j]);
7194 #ifdef EXIM_HAVE_SHA2
7195 if (vp && *(void **)vp->value)
7196 if (c == EOP_SHA256)
7197 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7199 expand_string_message = US"sha2_N not supported with certificates";
7204 hashmethod m = !arg ? HASH_SHA2_256
7205 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7206 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7207 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7210 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7212 expand_string_message = US"unrecognised sha2 variant";
7216 exim_sha_update(&h, sub, Ustrlen(sub));
7217 exim_sha_finish(&h, &b);
7219 yield = string_fmt_append(yield, "%02X", *b.data++);
7222 expand_string_message = US"sha256 only supported with TLS";
7227 #ifdef EXIM_HAVE_SHA3
7231 hashmethod m = !arg ? HASH_SHA3_256
7232 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7233 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7234 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7235 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7238 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7240 expand_string_message = US"unrecognised sha3 variant";
7244 exim_sha_update(&h, sub, Ustrlen(sub));
7245 exim_sha_finish(&h, &b);
7247 yield = string_fmt_append(yield, "%02X", *b.data++);
7251 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7255 /* Convert hex encoding to base64 encoding */
7265 for (enc = sub; *enc; enc++)
7267 if (!isxdigit(*enc))
7269 expand_string_message = string_sprintf("\"%s\" is not a hex "
7278 expand_string_message = string_sprintf("\"%s\" contains an odd "
7279 "number of characters", sub);
7283 while ((c = *in++) != 0)
7285 if (isdigit(c)) c -= '0';
7286 else c = toupper(c) - 'A' + 10;
7296 enc = b64encode(CUS sub, out - sub);
7297 yield = string_cat(yield, enc);
7301 /* Convert octets outside 0x21..0x7E to \xXX form */
7305 uschar *t = sub - 1;
7308 if (*t < 0x21 || 0x7E < *t)
7309 yield = string_fmt_append(yield, "\\x%02x", *t);
7311 yield = string_catn(yield, t, 1);
7316 /* count the number of list elements */
7320 int cnt = 0, sep = 0;
7321 uschar * buf = store_get(2, is_tainted(sub));
7323 while (string_nextinlist(CUSS &sub, &sep, buf, 1)) cnt++;
7324 yield = string_fmt_append(yield, "%d", cnt);
7328 /* expand a named list given the name */
7329 /* handles nested named lists; requotes as colon-sep list */
7332 expand_string_message = NULL;
7333 yield = expand_listnamed(yield, sub, arg);
7334 if (expand_string_message)
7338 /* quote a list-item for the given list-separator */
7340 /* mask applies a mask to an IP address; for example the result of
7341 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7348 int type, mask, maskoffset;
7352 if ((type = string_is_ip_address(sub, &maskoffset)) == 0)
7354 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7359 if (maskoffset == 0)
7361 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7366 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7368 if (*endptr || mask < 0 || mask > (type == 4 ? 32 : 128))
7370 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7375 /* If an optional 'n' was given, ipv6 gets normalised output:
7376 colons rather than dots, and zero-compressed. */
7378 normalised = arg && *arg == 'n';
7380 /* Convert the address to binary integer(s) and apply the mask */
7382 sub[maskoffset] = 0;
7383 count = host_aton(sub, binary);
7384 host_mask(count, binary, mask);
7386 /* Convert to masked textual format and add to output. */
7388 if (type == 4 || !normalised)
7389 yield = string_catn(yield, buffer,
7390 host_nmtoa(count, binary, mask, buffer, '.'));
7393 ipv6_nmtoa(binary, buffer);
7394 yield = string_fmt_append(yield, "%s/%d", buffer, mask);
7400 case EOP_IPV6DENORM:
7402 int type = string_is_ip_address(sub, NULL);
7409 (void) host_aton(sub, binary);
7412 case 4: /* convert to IPv4-mapped IPv6 */
7413 binary[0] = binary[1] = 0;
7414 binary[2] = 0x0000ffff;
7415 (void) host_aton(sub, binary+3);
7419 expand_string_message =
7420 string_sprintf("\"%s\" is not an IP address", sub);
7424 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7425 ? ipv6_nmtoa(binary, buffer)
7426 : host_nmtoa(4, binary, -1, buffer, ':')
7432 case EOP_LOCAL_PART:
7436 int start, end, domain;
7437 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7440 if (c != EOP_DOMAIN)
7441 yield = c == EOP_LOCAL_PART && domain > 0
7442 ? string_catn(yield, t, domain - 1)
7443 : string_cat(yield, t);
7444 else if (domain > 0)
7445 yield = string_cat(yield, t + domain);
7451 uschar outsep[2] = { ':', '\0' };
7452 uschar *address, *error;
7453 int save_ptr = gstring_length(yield);
7454 int start, end, domain; /* Not really used */
7456 if (Uskip_whitespace(&sub) == '>')
7457 if (*outsep = *++sub) ++sub;
7460 expand_string_message = string_sprintf("output separator "
7461 "missing in expanding ${addresses:%s}", --sub);
7464 f.parse_allow_group = TRUE;
7468 uschar * p = parse_find_address_end(sub, FALSE);
7469 uschar saveend = *p;
7471 address = parse_extract_address(sub, &error, &start, &end, &domain,
7475 /* Add the address to the output list that we are building. This is
7476 done in chunks by searching for the separator character. At the
7477 start, unless we are dealing with the first address of the output
7478 list, add in a space if the new address begins with the separator
7479 character, or is an empty string. */
7483 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7484 yield = string_catn(yield, US" ", 1);
7488 size_t seglen = Ustrcspn(address, outsep);
7489 yield = string_catn(yield, address, seglen + 1);
7491 /* If we got to the end of the string we output one character
7494 if (address[seglen] == '\0') { yield->ptr--; break; }
7495 yield = string_catn(yield, outsep, 1);
7496 address += seglen + 1;
7499 /* Output a separator after the string: we will remove the
7500 redundant final one at the end. */
7502 yield = string_catn(yield, outsep, 1);
7505 if (saveend == '\0') break;
7509 /* If we have generated anything, remove the redundant final
7512 if (yield && yield->ptr != save_ptr) yield->ptr--;
7513 f.parse_allow_group = FALSE;
7518 /* quote puts a string in quotes if it is empty or contains anything
7519 other than alphamerics, underscore, dot, or hyphen.
7521 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7522 be quoted in order to be a valid local part.
7524 In both cases, newlines and carriage returns are converted into \n and \r
7528 case EOP_QUOTE_LOCAL_PART:
7531 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7532 uschar *t = sub - 1;
7535 while (!needs_quote && *++t)
7536 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7538 else /* EOP_QUOTE_LOCAL_PART */
7539 while (!needs_quote && *++t)
7540 needs_quote = !isalnum(*t)
7541 && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL
7542 && (*t != '.' || t == sub || !t[1]);
7546 yield = string_catn(yield, US"\"", 1);
7550 yield = string_catn(yield, US"\\n", 2);
7551 else if (*t == '\r')
7552 yield = string_catn(yield, US"\\r", 2);
7555 if (*t == '\\' || *t == '"')
7556 yield = string_catn(yield, US"\\", 1);
7557 yield = string_catn(yield, t, 1);
7559 yield = string_catn(yield, US"\"", 1);
7562 yield = string_cat(yield, sub);
7566 /* quote_lookuptype does lookup-specific quoting */
7571 uschar *opt = Ustrchr(arg, '_');
7573 if (opt) *opt++ = 0;
7575 if ((n = search_findtype(arg, Ustrlen(arg))) < 0)
7577 expand_string_message = search_error_message;
7581 if (lookup_list[n]->quote)
7582 sub = (lookup_list[n]->quote)(sub, opt);
7588 expand_string_message = string_sprintf(
7589 "\"%s\" unrecognized after \"${quote_%s\"",
7594 yield = string_cat(yield, sub);
7598 /* rx quote sticks in \ before any non-alphameric character so that
7599 the insertion works in a regular expression. */
7603 uschar *t = sub - 1;
7607 yield = string_catn(yield, US"\\", 1);
7608 yield = string_catn(yield, t, 1);
7613 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7614 prescribed by the RFC, if there are characters that need to be encoded */
7617 yield = string_cat(yield,
7618 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7622 /* RFC 2047 decode */
7628 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7629 headers_charset, '?', &len, &error);
7632 expand_string_message = error;
7635 yield = string_catn(yield, decoded, len);
7639 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7644 uschar * buff = store_get(4, is_tainted(sub));
7649 if (c > 255) c = '_';
7651 yield = string_catn(yield, buff, 1);
7656 /* replace illegal UTF-8 sequences by replacement character */
7658 #define UTF8_REPLACEMENT_CHAR US"?"
7662 int seq_len = 0, index = 0;
7664 long codepoint = -1;
7666 uschar seq_buff[4]; /* accumulate utf-8 here */
7668 /* Manually track tainting, as we deal in individual chars below */
7670 if (is_tainted(sub))
7672 if (yield->s && yield->ptr)
7673 gstring_rebuffer(yield);
7675 yield->s = store_get(yield->size = Ustrlen(sub), TRUE);
7678 /* Check the UTF-8, byte-by-byte */
7687 if ((c & 0xc0) != 0x80)
7688 /* wrong continuation byte; invalidate all bytes */
7689 complete = 1; /* error */
7692 codepoint = (codepoint << 6) | (c & 0x3f);
7693 seq_buff[index++] = c;
7694 if (--bytes_left == 0) /* codepoint complete */
7695 if(codepoint > 0x10FFFF) /* is it too large? */
7696 complete = -1; /* error (RFC3629 limit) */
7698 { /* finished; output utf-8 sequence */
7699 yield = string_catn(yield, seq_buff, seq_len);
7704 else /* no bytes left: new sequence */
7706 if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7708 yield = string_catn(yield, &c, 1);
7711 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
7713 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7718 codepoint = c & 0x1f;
7721 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
7724 codepoint = c & 0x0f;
7726 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
7729 codepoint = c & 0x07;
7731 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7734 seq_buff[index++] = c;
7735 seq_len = bytes_left + 1;
7736 } /* if(bytes_left) */
7740 bytes_left = index = 0;
7741 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7743 if ((complete == 1) && ((c & 0x80) == 0))
7744 /* ASCII character follows incomplete sequence */
7745 yield = string_catn(yield, &c, 1);
7747 /* If given a sequence truncated mid-character, we also want to report ?
7748 * Eg, ${length_1:フィル} is one byte, not one character, so we expect
7749 * ${utf8clean:${length_1:フィル}} to yield '?' */
7750 if (bytes_left != 0)
7751 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7757 case EOP_UTF8_DOMAIN_TO_ALABEL:
7759 uschar * error = NULL;
7760 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7763 expand_string_message = string_sprintf(
7764 "error converting utf8 (%s) to alabel: %s",
7765 string_printing(sub), error);
7768 yield = string_cat(yield, s);
7772 case EOP_UTF8_DOMAIN_FROM_ALABEL:
7774 uschar * error = NULL;
7775 uschar * s = string_domain_alabel_to_utf8(sub, &error);
7778 expand_string_message = string_sprintf(
7779 "error converting alabel (%s) to utf8: %s",
7780 string_printing(sub), error);
7783 yield = string_cat(yield, s);
7787 case EOP_UTF8_LOCALPART_TO_ALABEL:
7789 uschar * error = NULL;
7790 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
7793 expand_string_message = string_sprintf(
7794 "error converting utf8 (%s) to alabel: %s",
7795 string_printing(sub), error);
7798 yield = string_cat(yield, s);
7799 DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s);
7803 case EOP_UTF8_LOCALPART_FROM_ALABEL:
7805 uschar * error = NULL;
7806 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
7809 expand_string_message = string_sprintf(
7810 "error converting alabel (%s) to utf8: %s",
7811 string_printing(sub), error);
7814 yield = string_cat(yield, s);
7817 #endif /* EXPERIMENTAL_INTERNATIONAL */
7819 /* escape turns all non-printing characters into escape sequences. */
7823 const uschar * t = string_printing(sub);
7824 yield = string_cat(yield, t);
7828 case EOP_ESCAPE8BIT:
7832 for (const uschar * s = sub; (c = *s); s++)
7833 yield = c < 127 && c != '\\'
7834 ? string_catn(yield, s, 1)
7835 : string_fmt_append(yield, "\\%03o", c);
7839 /* Handle numeric expression evaluation */
7844 uschar *save_sub = sub;
7845 uschar *error = NULL;
7846 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
7849 expand_string_message = string_sprintf("error in expression "
7850 "evaluation: %s (after processing \"%.*s\")", error,
7851 (int)(sub-save_sub), save_sub);
7854 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
7858 /* Handle time period formatting */
7862 int n = readconf_readtime(sub, 0, FALSE);
7865 expand_string_message = string_sprintf("string \"%s\" is not an "
7866 "Exim time interval in \"%s\" operator", sub, name);
7869 yield = string_fmt_append(yield, "%d", n);
7873 case EOP_TIME_INTERVAL:
7876 uschar *t = read_number(&n, sub);
7877 if (*t != 0) /* Not A Number*/
7879 expand_string_message = string_sprintf("string \"%s\" is not a "
7880 "positive number in \"%s\" operator", sub, name);
7883 t = readconf_printtime(n);
7884 yield = string_cat(yield, t);
7888 /* Convert string to base64 encoding */
7894 uschar * s = vp && *(void **)vp->value
7895 ? tls_cert_der_b64(*(void **)vp->value)
7896 : b64encode(CUS sub, Ustrlen(sub));
7898 uschar * s = b64encode(CUS sub, Ustrlen(sub));
7900 yield = string_cat(yield, s);
7907 int len = b64decode(sub, &s);
7910 expand_string_message = string_sprintf("string \"%s\" is not "
7911 "well-formed for \"%s\" operator", sub, name);
7914 yield = string_cat(yield, s);
7918 /* strlen returns the length of the string */
7921 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
7924 /* length_n or l_n takes just the first n characters or the whole string,
7925 whichever is the shorter;
7927 substr_m_n, and s_m_n take n characters from offset m; negative m take
7928 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
7929 takes the rest, either to the right or to the left.
7931 hash_n or h_n makes a hash of length n from the string, yielding n
7932 characters from the set a-z; hash_n_m makes a hash of length n, but
7933 uses m characters from the set a-zA-Z0-9.
7935 nhash_n returns a single number between 0 and n-1 (in text form), while
7936 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
7937 between 0 and n-1 and the second between 0 and m-1. */
7957 expand_string_message = string_sprintf("missing values after %s",
7962 /* "length" has only one argument, effectively being synonymous with
7965 if (c == EOP_LENGTH || c == EOP_L)
7971 /* The others have one or two arguments; for "substr" the first may be
7972 negative. The second being negative means "not supplied". */
7977 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
7980 /* Read up to two numbers, separated by underscores */
7985 if (arg != ret && *arg == '_' && pn == &value1)
7989 if (arg[1] != 0) arg++;
7991 else if (!isdigit(*arg))
7993 expand_string_message =
7994 string_sprintf("non-digit after underscore in \"%s\"", name);
7997 else *pn = (*pn)*10 + *arg++ - '0';
8001 /* Perform the required operation */
8003 ret = c == EOP_HASH || c == EOP_H
8004 ? compute_hash(sub, value1, value2, &len)
8005 : c == EOP_NHASH || c == EOP_NH
8006 ? compute_nhash(sub, value1, value2, &len)
8007 : extract_substr(sub, value1, value2, &len);
8008 if (!ret) goto EXPAND_FAILED;
8010 yield = string_catn(yield, ret, len);
8019 uschar **modetable[3];
8023 if (expand_forbid & RDO_EXISTS)
8025 expand_string_message = US"Use of the stat() expansion is not permitted";
8029 if (stat(CS sub, &st) < 0)
8031 expand_string_message = string_sprintf("stat(%s) failed: %s",
8032 sub, strerror(errno));
8036 switch (mode & S_IFMT)
8038 case S_IFIFO: smode[0] = 'p'; break;
8039 case S_IFCHR: smode[0] = 'c'; break;
8040 case S_IFDIR: smode[0] = 'd'; break;
8041 case S_IFBLK: smode[0] = 'b'; break;
8042 case S_IFREG: smode[0] = '-'; break;
8043 default: smode[0] = '?'; break;
8046 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8047 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8048 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8050 for (int i = 0; i < 3; i++)
8052 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8057 yield = string_fmt_append(yield,
8058 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8059 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8060 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8061 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8062 (long)st.st_gid, st.st_size, (long)st.st_atime,
8063 (long)st.st_mtime, (long)st.st_ctime);
8067 /* vaguely random number less than N */
8071 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8073 if (expand_string_message)
8075 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8079 /* Reverse IP, including IPv6 to dotted-nibble */
8081 case EOP_REVERSE_IP:
8083 int family, maskptr;
8084 uschar reversed[128];
8086 family = string_is_ip_address(sub, &maskptr);
8089 expand_string_message = string_sprintf(
8090 "reverse_ip() not given an IP address [%s]", sub);
8093 invert_address(reversed, sub);
8094 yield = string_cat(yield, reversed);
8098 /* Unknown operator */
8101 expand_string_message =
8102 string_sprintf("unknown expansion operator \"%s\"", name);
8107 /* Handle a plain name. If this is the first thing in the expansion, release
8108 the pre-allocated buffer. If the result data is known to be in a new buffer,
8109 newsize will be set to the size of that buffer, and we can just point at that
8110 store instead of copying. Many expansion strings contain just one reference,
8111 so this is a useful optimization, especially for humungous headers
8112 ($message_headers). */
8116 const uschar * value;
8122 g = store_get(sizeof(gstring), FALSE);
8123 else if (yield->ptr == 0)
8125 if (resetok) reset_point = store_reset(reset_point);
8127 reset_point = store_mark();
8128 g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */
8130 if (!(value = find_variable(name, FALSE, skipping, &newsize)))
8132 expand_string_message =
8133 string_sprintf("unknown variable in \"${%s}\"", name);
8134 check_variable_error_message(name);
8137 len = Ustrlen(value);
8138 if (!yield && newsize)
8141 yield->size = newsize;
8143 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
8146 yield = string_catn(yield, value, len);
8150 /* Else there's something wrong */
8152 expand_string_message =
8153 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8154 "in a variable reference)", name);
8158 /* If we hit the end of the string when ket_ends is set, there is a missing
8159 terminating brace. */
8161 if (ket_ends && *s == 0)
8163 expand_string_message = malformed_header
8164 ? US"missing } at end of string - could be header name not terminated by colon"
8165 : US"missing } at end of string";
8169 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8170 added to the string. If so, set up an empty string. Add a terminating zero. If
8171 left != NULL, return a pointer to the terminator. */
8174 yield = string_get(1);
8175 (void) string_from_gstring(yield);
8176 if (left) *left = s;
8178 /* Any stacking store that was used above the final string is no longer needed.
8179 In many cases the final string will be the first one that was got and so there
8180 will be optimal store usage. */
8182 if (resetok) gstring_release_unused(yield);
8183 else if (resetok_p) *resetok_p = FALSE;
8187 BOOL tainted = is_tainted(yield->s);
8190 debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string);
8191 debug_printf_indent("%sresult: %s\n",
8192 skipping ? "|-----" : "\\_____", yield->s);
8194 debug_printf_indent("%s \\__(tainted)\n",
8195 skipping ? "| " : " ");
8197 debug_printf_indent("\\___skipping: result is not used\n");
8201 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
8202 "expanding: %.*s\n",
8203 (int)(s - string), string);
8204 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8206 skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8209 debug_printf_indent("%s(tainted)\n",
8211 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8213 debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8214 "skipping: result is not used\n");
8220 /* This is the failure exit: easiest to program with a goto. We still need
8221 to update the pointer to the terminator, for cases of nested calls with "fail".
8224 EXPAND_FAILED_CURLY:
8225 if (malformed_header)
8226 expand_string_message =
8227 US"missing or misplaced { or } - could be header name not terminated by colon";
8229 else if (!expand_string_message || !*expand_string_message)
8230 expand_string_message = US"missing or misplaced { or }";
8232 /* At one point, Exim reset the store to yield (if yield was not NULL), but
8233 that is a bad idea, because expand_string_message is in dynamic store. */
8236 if (left) *left = s;
8241 debug_printf_indent("|failed to expand: %s\n", string);
8242 debug_printf_indent("%serror message: %s\n",
8243 f.expand_string_forcedfail ? "|---" : "\\___", expand_string_message);
8244 if (f.expand_string_forcedfail)
8245 debug_printf_indent("\\failure was forced\n");
8249 debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n",
8251 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8252 "error message: %s\n",
8253 f.expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8254 expand_string_message);
8255 if (f.expand_string_forcedfail)
8256 debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n");
8259 if (resetok_p && !resetok) *resetok_p = FALSE;
8265 /* This is the external function call. Do a quick check for any expansion
8266 metacharacters, and if there are none, just return the input string.
8268 Argument: the string to be expanded
8269 Returns: the expanded string, or NULL if expansion failed; if failure was
8270 due to a lookup deferring, search_find_defer will be TRUE
8274 expand_cstring(const uschar * string)
8276 if (Ustrpbrk(string, "$\\") != NULL)
8278 int old_pool = store_pool;
8281 f.search_find_defer = FALSE;
8282 malformed_header = FALSE;
8283 store_pool = POOL_MAIN;
8284 s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL);
8285 store_pool = old_pool;
8293 expand_string(uschar * string)
8295 return US expand_cstring(CUS string);
8302 /*************************************************
8304 *************************************************/
8306 /* Now and again we want to expand a string and be sure that the result is in a
8307 new bit of store. This function does that.
8308 Since we know it has been copied, the de-const cast is safe.
8310 Argument: the string to be expanded
8311 Returns: the expanded string, always in a new bit of store, or NULL
8315 expand_string_copy(const uschar *string)
8317 const uschar *yield = expand_cstring(string);
8318 if (yield == string) yield = string_copy(string);
8324 /*************************************************
8325 * Expand and interpret as an integer *
8326 *************************************************/
8328 /* Expand a string, and convert the result into an integer.
8331 string the string to be expanded
8332 isplus TRUE if a non-negative number is expected
8334 Returns: the integer value, or
8335 -1 for an expansion error ) in both cases, message in
8336 -2 for an integer interpretation error ) expand_string_message
8337 expand_string_message is set NULL for an OK integer
8341 expand_string_integer(uschar *string, BOOL isplus)
8343 return expanded_string_integer(expand_string(string), isplus);
8347 /*************************************************
8348 * Interpret string as an integer *
8349 *************************************************/
8351 /* Convert a string (that has already been expanded) into an integer.
8353 This function is used inside the expansion code.
8356 s the string to be expanded
8357 isplus TRUE if a non-negative number is expected
8359 Returns: the integer value, or
8360 -1 if string is NULL (which implies an expansion error)
8361 -2 for an integer interpretation error
8362 expand_string_message is set NULL for an OK integer
8365 static int_eximarith_t
8366 expanded_string_integer(const uschar *s, BOOL isplus)
8368 int_eximarith_t value;
8369 uschar *msg = US"invalid integer \"%s\"";
8372 /* If expansion failed, expand_string_message will be set. */
8376 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8377 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8378 systems, so we set it zero ourselves. */
8381 expand_string_message = NULL; /* Indicates no error */
8383 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8384 equal to 0. Unfortunately, people actually relied upon that, so preserve
8385 the behaviour explicitly. Stripping leading whitespace is a harmless
8386 noop change since strtol skips it anyway (provided that there is a number
8389 if (Uskip_whitespace(&s) == '\0')
8392 debug_printf_indent("treating blank string as number 0\n");
8396 value = strtoll(CS s, CSS &endptr, 10);
8399 msg = US"integer expected but \"%s\" found";
8400 else if (value < 0 && isplus)
8401 msg = US"non-negative integer expected but \"%s\" found";
8404 switch (tolower(*endptr))
8409 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8414 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8415 else value *= 1024*1024;
8419 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8420 else value *= 1024*1024*1024;
8424 if (errno == ERANGE)
8425 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8427 if (Uskip_whitespace(&endptr) == 0) return value;
8430 expand_string_message = string_sprintf(CS msg, s);
8435 /* These values are usually fixed boolean values, but they are permitted to be
8439 addr address being routed
8440 mtype the module type
8441 mname the module name
8442 dbg_opt debug selectors
8443 oname the option name
8444 bvalue the router's boolean value
8445 svalue the router's string value
8446 rvalue where to put the returned value
8448 Returns: OK value placed in rvalue
8449 DEFER expansion failed
8453 exp_bool(address_item *addr,
8454 uschar *mtype, uschar *mname, unsigned dbg_opt,
8455 uschar *oname, BOOL bvalue,
8456 uschar *svalue, BOOL *rvalue)
8459 if (!svalue) { *rvalue = bvalue; return OK; }
8461 if (!(expanded = expand_string(svalue)))
8463 if (f.expand_string_forcedfail)
8465 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8469 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8470 oname, mname, mtype, expand_string_message);
8471 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8475 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8478 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8480 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8484 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8485 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8494 /* Avoid potentially exposing a password in a string about to be logged */
8497 expand_hide_passwords(uschar * s)
8499 return ( ( Ustrstr(s, "failed to expand") != NULL
8500 || Ustrstr(s, "expansion of ") != NULL
8502 && ( Ustrstr(s, "mysql") != NULL
8503 || Ustrstr(s, "pgsql") != NULL
8504 || Ustrstr(s, "redis") != NULL
8505 || Ustrstr(s, "sqlite") != NULL
8506 || Ustrstr(s, "ldap:") != NULL
8507 || Ustrstr(s, "ldaps:") != NULL
8508 || Ustrstr(s, "ldapi:") != NULL
8509 || Ustrstr(s, "ldapdn:") != NULL
8510 || Ustrstr(s, "ldapm:") != NULL
8512 ? US"Temporary internal error" : s;
8516 /* Read given named file into big_buffer. Use for keying material etc.
8517 The content will have an ascii NUL appended.
8522 Return: pointer to buffer, or NULL on error.
8526 expand_file_big_buffer(const uschar * filename)
8528 int fd, off = 0, len;
8530 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8532 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8539 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8542 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8550 big_buffer[off] = '\0';
8556 /*************************************************
8557 * Error-checking for testsuite *
8558 *************************************************/
8560 uschar * region_start;
8561 uschar * region_end;
8562 const uschar *var_name;
8563 const uschar *var_data;
8566 /* Called via tree_walk, which allows nonconst name/data. Our usage is const. */
8568 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8571 if (var_data >= e->region_start && var_data < e->region_end)
8573 e->var_name = CUS var_name;
8574 e->var_data = CUS var_data;
8579 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8581 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8582 .var_name = NULL, .var_data = NULL };
8584 /* check acl_ variables */
8585 tree_walk(acl_var_c, assert_variable_notin, &e);
8586 tree_walk(acl_var_m, assert_variable_notin, &e);
8588 /* check auth<n> variables.
8589 assert_variable_notin() treats as const, so deconst is safe. */
8590 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8591 assert_variable_notin(US"auth<n>", US auth_vars[i], &e);
8593 /* check regex<n> variables. assert_variable_notin() treats as const. */
8594 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8595 assert_variable_notin(US"regex<n>", US regex_vars[i], &e);
8597 /* check known-name variables */
8598 for (var_entry * v = var_table; v < var_table + var_table_size; v++)
8599 if (v->type == vtype_stringptr)
8600 assert_variable_notin(US v->name, *(USS v->value), &e);
8602 /* check dns and address trees */
8603 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8604 tree_walk(tree_duplicates, assert_variable_notin, &e);
8605 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8606 tree_walk(tree_unusable, assert_variable_notin, &e);
8609 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8610 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8611 e.var_name, filename, linenumber, e.var_data);
8616 /*************************************************
8617 **************************************************
8618 * Stand-alone test program *
8619 **************************************************
8620 *************************************************/
8626 regex_match_and_setup(const pcre2_code *re, uschar *subject, int options, int setup)
8628 int ovec[3*(EXPAND_MAXN+1)];
8629 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8631 BOOL yield = n >= 0;
8632 if (n == 0) n = EXPAND_MAXN + 1;
8635 expand_nmax = setup < 0 ? 0 : setup + 1;
8636 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8638 expand_nstring[expand_nmax] = subject + ovec[nn];
8639 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
8647 int main(int argc, uschar **argv)
8649 uschar buffer[1024];
8651 debug_selector = D_v;
8652 debug_file = stderr;
8653 debug_fd = fileno(debug_file);
8654 big_buffer = malloc(big_buffer_size);
8657 for (int i = 1; i < argc; i++)
8659 if (argv[i][0] == '+')
8661 debug_trace_memory = 2;
8664 if (isdigit(argv[i][0]))
8665 debug_selector = Ustrtol(argv[i], NULL, 0);
8667 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8671 eldap_default_servers = argv[i];
8674 mysql_servers = argv[i];
8677 pgsql_servers = argv[i];
8680 redis_servers = argv[i];
8684 else opt_perl_startup = argv[i];
8688 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8690 expand_nstring[1] = US"string 1....";
8691 expand_nlength[1] = 8;
8695 if (opt_perl_startup != NULL)
8698 printf("Starting Perl interpreter\n");
8699 errstr = init_perl(opt_perl_startup);
8702 printf("** error in perl_startup code: %s\n", errstr);
8703 return EXIT_FAILURE;
8706 #endif /* EXIM_PERL */
8708 /* Thie deliberately regards the input as untainted, so that it can be
8709 expanded; only reasonable since this is a test for string-expansions. */
8711 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8713 rmark reset_point = store_mark();
8714 uschar *yield = expand_string(buffer);
8716 printf("%s\n", yield);
8719 if (f.search_find_defer) printf("search_find deferred\n");
8720 printf("Failed: %s\n", expand_string_message);
8721 if (f.expand_string_forcedfail) printf("Forced failure\n");
8724 store_reset(reset_point);
8736 /* End of expand.c */