1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
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 },
754 { "srs_recipient", vtype_stringptr, &srs_recipient },
756 { "thisaddress", vtype_stringptr, &filter_thisaddress },
758 /* The non-(in,out) variables are now deprecated */
759 { "tls_bits", vtype_int, &tls_in.bits },
760 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
761 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
763 { "tls_in_bits", vtype_int, &tls_in.bits },
764 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
765 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
766 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
767 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
768 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
769 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
770 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
771 #ifndef DISABLE_TLS_RESUME
772 { "tls_in_resumption", vtype_int, &tls_in.resumption },
775 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
777 { "tls_in_ver", vtype_stringptr, &tls_in.ver },
778 { "tls_out_bits", vtype_int, &tls_out.bits },
779 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
780 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
781 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
783 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
785 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
786 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
787 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
788 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
789 #ifndef DISABLE_TLS_RESUME
790 { "tls_out_resumption", vtype_int, &tls_out.resumption },
793 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
796 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
798 { "tls_out_ver", vtype_stringptr, &tls_out.ver },
800 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
802 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
805 { "tod_bsdinbox", vtype_todbsdin, NULL },
806 { "tod_epoch", vtype_tode, NULL },
807 { "tod_epoch_l", vtype_todel, NULL },
808 { "tod_full", vtype_todf, NULL },
809 { "tod_log", vtype_todl, NULL },
810 { "tod_logfile", vtype_todlf, NULL },
811 { "tod_zone", vtype_todzone, NULL },
812 { "tod_zulu", vtype_todzulu, NULL },
813 { "transport_name", vtype_stringptr, &transport_name },
814 { "value", vtype_stringptr, &lookup_value },
815 { "verify_mode", vtype_stringptr, &verify_mode },
816 { "version_number", vtype_stringptr, &version_string },
817 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
818 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
819 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
820 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
821 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
822 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
825 static int var_table_size = nelem(var_table);
826 static uschar var_buffer[256];
827 static BOOL malformed_header;
829 /* For textual hashes */
831 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
832 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
835 enum { HMAC_MD5, HMAC_SHA1 };
837 /* For numeric hashes */
839 static unsigned int prime[] = {
840 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
841 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
842 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
844 /* For printing modes in symbolic form */
846 static uschar *mtable_normal[] =
847 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
849 static uschar *mtable_setid[] =
850 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
852 static uschar *mtable_sticky[] =
853 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
855 /* flags for find_header() */
856 #define FH_EXISTS_ONLY BIT(0)
857 #define FH_WANT_RAW BIT(1)
858 #define FH_WANT_LIST BIT(2)
861 /*************************************************
862 * Tables for UTF-8 support *
863 *************************************************/
865 /* Table of the number of extra characters, indexed by the first character
866 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
869 static uschar utf8_table1[] = {
870 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
871 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
872 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
873 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
875 /* These are the masks for the data bits in the first byte of a character,
876 indexed by the number of additional bytes. */
878 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
880 /* Get the next UTF-8 character, advancing the pointer. */
882 #define GETUTF8INC(c, ptr) \
884 if ((c & 0xc0) == 0xc0) \
886 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
888 c = (c & utf8_table2[a]) << s; \
892 c |= (*ptr++ & 0x3f) << s; \
898 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
900 /*************************************************
901 * Binary chop search on a table *
902 *************************************************/
904 /* This is used for matching expansion items and operators.
907 name the name that is being sought
908 table the table to search
909 table_size the number of items in the table
911 Returns: the offset in the table, or -1
915 chop_match(uschar *name, uschar **table, int table_size)
917 uschar **bot = table;
918 uschar **top = table + table_size;
922 uschar **mid = bot + (top - bot)/2;
923 int c = Ustrcmp(name, *mid);
924 if (c == 0) return mid - table;
925 if (c > 0) bot = mid + 1; else top = mid;
933 /*************************************************
934 * Check a condition string *
935 *************************************************/
937 /* This function is called to expand a string, and test the result for a "true"
938 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
939 forced fail or lookup defer.
941 We used to release all store used, but this is not not safe due
942 to ${dlfunc } and ${acl }. In any case expand_string_internal()
943 is reasonably careful to release what it can.
945 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
948 condition the condition string
949 m1 text to be incorporated in panic error
952 Returns: TRUE if condition is met, FALSE if not
956 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
958 uschar * ss = expand_string(condition);
961 if (!f.expand_string_forcedfail && !f.search_find_defer)
962 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
963 "for %s %s: %s", condition, m1, m2, expand_string_message);
966 return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
967 strcmpic(ss, US"false") != 0;
973 /*************************************************
974 * Pseudo-random number generation *
975 *************************************************/
977 /* Pseudo-random number generation. The result is not "expected" to be
978 cryptographically strong but not so weak that someone will shoot themselves
979 in the foot using it as a nonce in some email header scheme or whatever
980 weirdness they'll twist this into. The result should ideally handle fork().
982 However, if we're stuck unable to provide this, then we'll fall back to
983 appallingly bad randomness.
985 If DISABLE_TLS is not defined then this will not be used except as an emergency
990 Returns a random number in range [0, max-1]
994 # define vaguely_random_number vaguely_random_number_fallback
997 vaguely_random_number(int max)
1000 # undef vaguely_random_number
1002 static pid_t pid = 0;
1005 if ((p2 = getpid()) != pid)
1010 #ifdef HAVE_ARC4RANDOM
1011 /* cryptographically strong randomness, common on *BSD platforms, not
1012 so much elsewhere. Alas. */
1013 # ifndef NOT_HAVE_ARC4RANDOM_STIR
1016 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1017 # ifdef HAVE_SRANDOMDEV
1018 /* uses random(4) for seeding */
1023 gettimeofday(&tv, NULL);
1024 srandom(tv.tv_sec | tv.tv_usec | getpid());
1028 /* Poor randomness and no seeding here */
1035 #ifdef HAVE_ARC4RANDOM
1036 return arc4random() % max;
1037 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1038 return random() % max;
1040 /* This one returns a 16-bit number, definitely not crypto-strong */
1041 return random_number(max);
1048 /*************************************************
1049 * Pick out a name from a string *
1050 *************************************************/
1052 /* If the name is too long, it is silently truncated.
1055 name points to a buffer into which to put the name
1056 max is the length of the buffer
1057 s points to the first alphabetic character of the name
1058 extras chars other than alphanumerics to permit
1060 Returns: pointer to the first character after the name
1062 Note: The test for *s != 0 in the while loop is necessary because
1063 Ustrchr() yields non-NULL if the character is zero (which is not something
1066 static const uschar *
1067 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1070 while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1072 if (ptr < max-1) name[ptr++] = *s;
1081 /*************************************************
1082 * Pick out the rest of a header name *
1083 *************************************************/
1085 /* A variable name starting $header_ (or just $h_ for those who like
1086 abbreviations) might not be the complete header name because headers can
1087 contain any printing characters in their names, except ':'. This function is
1088 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1089 on the end, if the name was terminated by white space.
1092 name points to a buffer in which the name read so far exists
1093 max is the length of the buffer
1094 s points to the first character after the name so far, i.e. the
1095 first non-alphameric character after $header_xxxxx
1097 Returns: a pointer to the first character after the header name
1100 static const uschar *
1101 read_header_name(uschar *name, int max, const uschar *s)
1103 int prelen = Ustrchr(name, '_') - name + 1;
1104 int ptr = Ustrlen(name) - prelen;
1105 if (ptr > 0) memmove(name, name+prelen, ptr);
1106 while (mac_isgraph(*s) && *s != ':')
1108 if (ptr < max-1) name[ptr++] = *s;
1119 /*************************************************
1120 * Pick out a number from a string *
1121 *************************************************/
1124 n points to an integer into which to put the number
1125 s points to the first digit of the number
1127 Returns: a pointer to the character after the last digit
1129 /*XXX consider expanding to int_eximarith_t. But the test for
1130 "overbig numbers" in 0002 still needs to overflow it. */
1133 read_number(int *n, uschar *s)
1136 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1140 static const uschar *
1141 read_cnumber(int *n, const uschar *s)
1144 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1150 /*************************************************
1151 * Extract keyed subfield from a string *
1152 *************************************************/
1154 /* The yield is in dynamic store; NULL means that the key was not found.
1157 key points to the name of the key
1158 s points to the string from which to extract the subfield
1160 Returns: NULL if the subfield was not found, or
1161 a pointer to the subfield's data
1165 expand_getkeyed(const uschar * key, const uschar * s)
1167 int length = Ustrlen(key);
1168 Uskip_whitespace(&s);
1170 /* Loop to search for the key */
1176 const uschar * dkey = s;
1178 while (*s && *s != '=' && !isspace(*s)) s++;
1179 dkeylength = s - dkey;
1180 if (Uskip_whitespace(&s) == '=') while (isspace(*++s));
1182 data = string_dequote(&s);
1183 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1186 Uskip_whitespace(&s);
1195 find_var_ent(uschar * name)
1198 int last = var_table_size;
1200 while (last > first)
1202 int middle = (first + last)/2;
1203 int c = Ustrcmp(name, var_table[middle].name);
1205 if (c > 0) { first = middle + 1; continue; }
1206 if (c < 0) { last = middle; continue; }
1207 return &var_table[middle];
1212 /*************************************************
1213 * Extract numbered subfield from string *
1214 *************************************************/
1216 /* Extracts a numbered field from a string that is divided by tokens - for
1217 example a line from /etc/passwd is divided by colon characters. First field is
1218 numbered one. Negative arguments count from the right. Zero returns the whole
1219 string. Returns NULL if there are insufficient tokens in the string
1222 Modifies final argument - this is a dynamically generated string, so that's OK.
1225 field number of field to be extracted,
1226 first field = 1, whole string = 0, last field = -1
1227 separators characters that are used to break string into tokens
1228 s points to the string from which to extract the subfield
1230 Returns: NULL if the field was not found,
1231 a pointer to the field's data inside s (modified to add 0)
1235 expand_gettokened (int field, uschar *separators, uschar *s)
1240 uschar *fieldtext = NULL;
1242 if (field == 0) return s;
1244 /* Break the line up into fields in place; for field > 0 we stop when we have
1245 done the number of fields we want. For field < 0 we continue till the end of
1246 the string, counting the number of fields. */
1248 count = (field > 0)? field : INT_MAX;
1254 /* Previous field was the last one in the string. For a positive field
1255 number, this means there are not enough fields. For a negative field number,
1256 check that there are enough, and scan back to find the one that is wanted. */
1260 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1261 if ((-field) == (INT_MAX - count - 1)) return s;
1265 while (ss[-1] != 0) ss--;
1271 /* Previous field was not last in the string; save its start and put a
1275 len = Ustrcspn(ss, separators);
1286 expand_getlistele(int field, const uschar * list)
1288 const uschar * tlist = list;
1290 /* Tainted mem for the throwaway element copies */
1291 uschar * dummy = store_get(2, GET_TAINTED);
1295 for (field++; string_nextinlist(&tlist, &sep, dummy, 1); ) field++;
1298 if (field == 0) return NULL;
1299 while (--field > 0 && (string_nextinlist(&list, &sep, dummy, 1))) ;
1300 return string_nextinlist(&list, &sep, NULL, 0);
1304 /* Certificate fields, by name. Worry about by-OID later */
1305 /* Names are chosen to not have common prefixes */
1312 uschar * (*getfn)(void * cert, uschar * mod);
1314 static certfield certfields[] =
1315 { /* linear search; no special order */
1316 { US"version", 7, &tls_cert_version },
1317 { US"serial_number", 13, &tls_cert_serial_number },
1318 { US"subject", 7, &tls_cert_subject },
1319 { US"notbefore", 9, &tls_cert_not_before },
1320 { US"notafter", 8, &tls_cert_not_after },
1321 { US"issuer", 6, &tls_cert_issuer },
1322 { US"signature", 9, &tls_cert_signature },
1323 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1324 { US"subj_altname", 12, &tls_cert_subject_altname },
1325 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1326 { US"crl_uri", 7, &tls_cert_crl_uri },
1330 expand_getcertele(uschar * field, uschar * certvar)
1334 if (!(vp = find_var_ent(certvar)))
1336 expand_string_message =
1337 string_sprintf("no variable named \"%s\"", certvar);
1338 return NULL; /* Unknown variable name */
1340 /* NB this stops us passing certs around in variable. Might
1341 want to do that in future */
1342 if (vp->type != vtype_cert)
1344 expand_string_message =
1345 string_sprintf("\"%s\" is not a certificate", certvar);
1346 return NULL; /* Unknown variable name */
1348 if (!*(void **)vp->value)
1351 if (*field >= '0' && *field <= '9')
1352 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1354 for (certfield * cp = certfields;
1355 cp < certfields + nelem(certfields);
1357 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1359 uschar * modifier = *(field += cp->namelen) == ','
1361 return (*cp->getfn)( *(void **)vp->value, modifier );
1364 expand_string_message =
1365 string_sprintf("bad field selector \"%s\" for certextract", field);
1368 #endif /*DISABLE_TLS*/
1370 /*************************************************
1371 * Extract a substring from a string *
1372 *************************************************/
1374 /* Perform the ${substr or ${length expansion operations.
1377 subject the input string
1378 value1 the offset from the start of the input string to the start of
1379 the output string; if negative, count from the right.
1380 value2 the length of the output string, or negative (-1) for unset
1381 if value1 is positive, unset means "all after"
1382 if value1 is negative, unset means "all before"
1383 len set to the length of the returned string
1385 Returns: pointer to the output string, or NULL if there is an error
1389 extract_substr(uschar *subject, int value1, int value2, int *len)
1391 int sublen = Ustrlen(subject);
1393 if (value1 < 0) /* count from right */
1397 /* If the position is before the start, skip to the start, and adjust the
1398 length. If the length ends up negative, the substring is null because nothing
1399 can precede. This falls out naturally when the length is unset, meaning "all
1405 if (value2 < 0) value2 = 0;
1409 /* Otherwise an unset length => characters before value1 */
1411 else if (value2 < 0)
1418 /* For a non-negative offset, if the starting position is past the end of the
1419 string, the result will be the null string. Otherwise, an unset length means
1420 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1424 if (value1 > sublen)
1429 else if (value2 < 0) value2 = sublen;
1432 /* Cut the length down to the maximum possible for the offset value, and get
1433 the required characters. */
1435 if (value1 + value2 > sublen) value2 = sublen - value1;
1437 return subject + value1;
1443 /*************************************************
1444 * Old-style hash of a string *
1445 *************************************************/
1447 /* Perform the ${hash expansion operation.
1450 subject the input string (an expanded substring)
1451 value1 the length of the output string; if greater or equal to the
1452 length of the input string, the input string is returned
1453 value2 the number of hash characters to use, or 26 if negative
1454 len set to the length of the returned string
1456 Returns: pointer to the output string, or NULL if there is an error
1460 compute_hash(uschar *subject, int value1, int value2, int *len)
1462 int sublen = Ustrlen(subject);
1464 if (value2 < 0) value2 = 26;
1465 else if (value2 > Ustrlen(hashcodes))
1467 expand_string_message =
1468 string_sprintf("hash count \"%d\" too big", value2);
1472 /* Calculate the hash text. We know it is shorter than the original string, so
1473 can safely place it in subject[] (we know that subject is always itself an
1474 expanded substring). */
1476 if (value1 < sublen)
1481 while ((c = (subject[j])) != 0)
1483 int shift = (c + j++) & 7;
1484 subject[i] ^= (c << shift) | (c >> (8-shift));
1485 if (++i >= value1) i = 0;
1487 for (i = 0; i < value1; i++)
1488 subject[i] = hashcodes[(subject[i]) % value2];
1490 else value1 = sublen;
1499 /*************************************************
1500 * Numeric hash of a string *
1501 *************************************************/
1503 /* Perform the ${nhash expansion operation. The first characters of the
1504 string are treated as most important, and get the highest prime numbers.
1507 subject the input string
1508 value1 the maximum value of the first part of the result
1509 value2 the maximum value of the second part of the result,
1510 or negative to produce only a one-part result
1511 len set to the length of the returned string
1513 Returns: pointer to the output string, or NULL if there is an error.
1517 compute_nhash (uschar *subject, int value1, int value2, int *len)
1519 uschar *s = subject;
1521 unsigned long int total = 0; /* no overflow */
1525 if (i == 0) i = nelem(prime) - 1;
1526 total += prime[i--] * (unsigned int)(*s++);
1529 /* If value2 is unset, just compute one number */
1532 s = string_sprintf("%lu", total % value1);
1534 /* Otherwise do a div/mod hash */
1538 total = total % (value1 * value2);
1539 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1550 /*************************************************
1551 * Find the value of a header or headers *
1552 *************************************************/
1554 /* Multiple instances of the same header get concatenated, and this function
1555 can also return a concatenation of all the header lines. When concatenating
1556 specific headers that contain lists of addresses, a comma is inserted between
1557 them. Otherwise we use a straight concatenation. Because some messages can have
1558 pathologically large number of lines, there is a limit on the length that is
1562 name the name of the header, without the leading $header_ or $h_,
1563 or NULL if a concatenation of all headers is required
1564 newsize return the size of memory block that was obtained; may be NULL
1565 if exists_only is TRUE
1566 flags FH_EXISTS_ONLY
1567 set if called from a def: test; don't need to build a string;
1568 just return a string that is not "" and not "0" if the header
1571 set if called for $rh_ or $rheader_ items; no processing,
1572 other than concatenating, will be done on the header. Also used
1573 for $message_headers_raw.
1575 Double colon chars in the content, and replace newline with
1576 colon between each element when concatenating; returning a
1577 colon-sep list (elements might contain newlines)
1578 charset name of charset to translate MIME words to; used only if
1579 want_raw is false; if NULL, no translation is done (this is
1580 used for $bh_ and $bheader_)
1582 Returns: NULL if the header does not exist, else a pointer to a new
1587 find_header(uschar *name, int *newsize, unsigned flags, const uschar *charset)
1590 int len = name ? Ustrlen(name) : 0;
1594 for (header_line * h = header_list; h; h = h->next)
1595 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1596 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1601 if (flags & FH_EXISTS_ONLY)
1602 return US"1"; /* don't need actual string */
1605 s = h->text + len; /* text to insert */
1606 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1607 Uskip_whitespace(&s); /* remove leading white space */
1608 t = h->text + h->slen; /* end-point */
1610 /* Unless wanted raw, remove trailing whitespace, including the
1613 if (flags & FH_WANT_LIST)
1614 while (t > s && t[-1] == '\n') t--;
1615 else if (!(flags & FH_WANT_RAW))
1617 while (t > s && isspace(t[-1])) t--;
1619 /* Set comma if handling a single header and it's one of those
1620 that contains an address list, except when asked for raw headers. Only
1621 need to do this once. */
1623 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1626 /* Trim the header roughly if we're approaching limits */
1628 if (gstring_length(g) + inc > header_insert_maxlen)
1629 inc = header_insert_maxlen - gstring_length(g);
1631 /* For raw just copy the data; for a list, add the data as a colon-sep
1632 list-element; for comma-list add as an unchecked comma,newline sep
1633 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1634 stripped trailing WS above including the newline). We ignore the potential
1635 expansion due to colon-doubling, just leaving the loop if the limit is met
1638 if (flags & FH_WANT_LIST)
1639 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1640 else if (flags & FH_WANT_RAW)
1641 g = string_catn(g, s, (unsigned)inc);
1643 g = string_append2_listele_n(g, comma ? US",\n" : US"\n",
1646 if (gstring_length(g) >= header_insert_maxlen) break;
1649 if (!found) return NULL; /* No header found */
1650 if (!g) return US"";
1652 /* That's all we do for raw header expansion. */
1655 if (flags & FH_WANT_RAW)
1656 return string_from_gstring(g);
1658 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1659 The rfc2047_decode2() function can return an error with decoded data if the
1660 charset translation fails. If decoding fails, it returns NULL. */
1664 uschar * error, * decoded = rfc2047_decode2(string_from_gstring(g),
1665 check_rfc2047_length, charset, '?', NULL, newsize, &error);
1667 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1668 " input was: %s\n", error, g->s);
1669 return decoded ? decoded : string_from_gstring(g);
1676 /* Append a "local" element to an Authentication-Results: header
1677 if this was a non-smtp message.
1681 authres_local(gstring * g, const uschar * sysname)
1683 if (!f.authentication_local)
1685 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1686 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1691 /* Append an "iprev" element to an Authentication-Results: header
1692 if we have attempted to get the calling host's name.
1696 authres_iprev(gstring * g)
1698 if (sender_host_name)
1699 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1700 else if (host_lookup_deferred)
1701 g = string_cat(g, US";\n\tiprev=temperror");
1702 else if (host_lookup_failed)
1703 g = string_cat(g, US";\n\tiprev=fail");
1707 if (sender_host_address)
1708 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1714 /*************************************************
1715 * Return list of recipients *
1716 *************************************************/
1717 /* A recipients list is available only during system message filtering,
1718 during ACL processing after DATA, and while expanding pipe commands
1719 generated from a system filter, but not elsewhere. */
1727 if (!f.enable_dollar_recipients) return NULL;
1729 for (int i = 0; i < recipients_count; i++)
1731 s = recipients_list[i].address;
1732 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1734 return g ? g->s : NULL;
1738 /*************************************************
1739 * Return size of queue *
1740 *************************************************/
1741 /* Ask the daemon for the queue size */
1746 struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
1750 const uschar * where;
1751 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1755 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1757 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1761 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1762 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1763 len = offsetof(struct sockaddr_un, sun_path) + 1
1764 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "exim_%d", getpid());
1766 sname = string_sprintf("%s/p_%d", spool_directory, getpid());
1767 len = offsetof(struct sockaddr_un, sun_path)
1768 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", sname);
1771 if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0)
1772 { where = US"bind"; goto bad; }
1775 debug_printf("local addr '%s%s'\n",
1776 *sa_un.sun_path ? "" : "@",
1777 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1780 len = daemon_notifier_sockname(&sa_un);
1781 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1782 { where = US"connect"; goto bad2; }
1784 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1785 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1787 if (poll_one_fd(fd, POLLIN, 2 * 1000) != 1)
1789 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1790 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1792 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1793 { where = US"recv"; goto bad2; }
1796 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1799 return string_copyn(buf, len);
1802 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1807 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1812 /*************************************************
1813 * Find value of a variable *
1814 *************************************************/
1816 /* The table of variables is kept in alphabetic order, so we can search it
1817 using a binary chop. The "choplen" variable is nothing to do with the binary
1821 name the name of the variable being sought
1822 exists_only TRUE if this is a def: test; passed on to find_header()
1823 skipping TRUE => skip any processing evaluation; this is not the same as
1824 exists_only because def: may test for values that are first
1826 newsize pointer to an int which is initially zero; if the answer is in
1827 a new memory buffer, *newsize is set to its size
1829 Returns: NULL if the variable does not exist, or
1830 a pointer to the variable's contents, or
1831 something non-NULL if exists_only is TRUE
1834 static const uschar *
1835 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1842 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1843 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1844 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1845 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1846 (this gave backwards compatibility at the changeover). There may be built-in
1847 variables whose names start acl_ but they should never start in this way. This
1848 slightly messy specification is a consequence of the history, needless to say.
1850 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1851 set, in which case give an error. */
1853 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1857 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1858 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1860 else if (Ustrncmp(name, "r_", 2) == 0)
1862 tree_node * node = tree_search(router_var, name + 2);
1863 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1866 /* Handle $auth<n> variables. */
1868 if (Ustrncmp(name, "auth", 4) == 0)
1871 int n = Ustrtoul(name + 4, &endptr, 10);
1872 if (!*endptr && n != 0 && n <= AUTH_VARS)
1873 return auth_vars[n-1] ? auth_vars[n-1] : US"";
1875 else if (Ustrncmp(name, "regex", 5) == 0)
1878 int n = Ustrtoul(name + 5, &endptr, 10);
1879 if (!*endptr && n != 0 && n <= REGEX_VARS)
1880 return regex_vars[n-1] ? regex_vars[n-1] : US"";
1883 /* For all other variables, search the table */
1885 if (!(vp = find_var_ent(name)))
1886 return NULL; /* Unknown variable name */
1888 /* Found an existing variable. If in skipping state, the value isn't needed,
1889 and we want to avoid processing (such as looking up the host name). */
1897 case vtype_filter_int:
1898 if (!f.filter_running) return NULL;
1902 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1906 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1910 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1914 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1918 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1921 case vtype_stringptr: /* Pointer to string */
1922 return (s = *((uschar **)(val))) ? s : US"";
1925 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1928 case vtype_load_avg:
1929 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1932 case vtype_host_lookup: /* Lookup if not done so */
1933 if ( !sender_host_name && sender_host_address
1934 && !host_lookup_failed && host_name_lookup() == OK)
1935 host_build_sender_fullhost();
1936 return sender_host_name ? sender_host_name : US"";
1938 case vtype_localpart: /* Get local part from address */
1939 if (!(s = *((uschar **)(val)))) return US"";
1940 if (!(domain = Ustrrchr(s, '@'))) return s;
1941 if (domain - s > sizeof(var_buffer) - 1)
1942 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1943 " in string expansion", sizeof(var_buffer));
1944 return string_copyn(s, domain - s);
1946 case vtype_domain: /* Get domain from address */
1947 if (!(s = *((uschar **)(val)))) return US"";
1948 domain = Ustrrchr(s, '@');
1949 return domain ? domain + 1 : US"";
1951 case vtype_msgheaders:
1952 return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL);
1954 case vtype_msgheaders_raw:
1955 return find_header(NULL, newsize,
1956 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL);
1958 case vtype_msgbody: /* Pointer to msgbody string */
1959 case vtype_msgbody_end: /* Ditto, the end of the msg */
1960 ss = (uschar **)(val);
1961 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1964 off_t start_offset = SPOOL_DATA_START_OFFSET;
1965 int len = message_body_visible;
1967 if (len > message_size) len = message_size;
1968 *ss = body = store_get(len+1, GET_TAINTED);
1970 if (vp->type == vtype_msgbody_end)
1972 struct stat statbuf;
1973 if (fstat(deliver_datafile, &statbuf) == 0)
1975 start_offset = statbuf.st_size - len;
1976 if (start_offset < SPOOL_DATA_START_OFFSET)
1977 start_offset = SPOOL_DATA_START_OFFSET;
1980 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
1981 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
1983 if ((len = read(deliver_datafile, body, len)) > 0)
1986 if (message_body_newlines) /* Separate loops for efficiency */
1988 { if (body[--len] == 0) body[len] = ' '; }
1991 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
1994 return *ss ? *ss : US"";
1996 case vtype_todbsdin: /* BSD inbox time of day */
1997 return tod_stamp(tod_bsdin);
1999 case vtype_tode: /* Unix epoch time of day */
2000 return tod_stamp(tod_epoch);
2002 case vtype_todel: /* Unix epoch/usec time of day */
2003 return tod_stamp(tod_epoch_l);
2005 case vtype_todf: /* Full time of day */
2006 return tod_stamp(tod_full);
2008 case vtype_todl: /* Log format time of day */
2009 return tod_stamp(tod_log_bare); /* (without timezone) */
2011 case vtype_todzone: /* Time zone offset only */
2012 return tod_stamp(tod_zone);
2014 case vtype_todzulu: /* Zulu time */
2015 return tod_stamp(tod_zulu);
2017 case vtype_todlf: /* Log file datestamp tod */
2018 return tod_stamp(tod_log_datestamp_daily);
2020 case vtype_reply: /* Get reply address */
2021 s = find_header(US"reply-to:", newsize,
2022 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2024 if (s) Uskip_whitespace(&s);
2027 *newsize = 0; /* For the *s==0 case */
2028 s = find_header(US"from:", newsize,
2029 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2035 Uskip_whitespace(&s);
2036 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2037 while (t > s && isspace(t[-1])) t--;
2040 return s ? s : US"";
2042 case vtype_string_func:
2044 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2046 return s ? s : US"";
2052 sprintf(CS var_buffer, PR_EXIM_ARITH,
2053 receive_statvfs(val == (void *)TRUE, &inodes));
2060 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2061 sprintf(CS var_buffer, "%d", inodes);
2066 return *(void **)val ? US"<cert>" : US"";
2068 #ifndef DISABLE_DKIM
2070 return dkim_exim_expand_query((int)(long)val);
2075 return NULL; /* Unknown variable. Silences static checkers. */
2082 modify_variable(uschar *name, void * value)
2085 if ((vp = find_var_ent(name))) vp->value = value;
2086 return; /* Unknown variable name, fail silently */
2094 /*************************************************
2095 * Read and expand substrings *
2096 *************************************************/
2098 /* This function is called to read and expand argument substrings for various
2099 expansion items. Some have a minimum requirement that is less than the maximum;
2100 in these cases, the first non-present one is set to NULL.
2103 sub points to vector of pointers to set
2104 n maximum number of substrings
2106 sptr points to current string pointer
2107 skipping the skipping flag
2108 check_end if TRUE, check for final '}'
2109 name name of item, for error message
2110 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2113 Returns: 0 OK; string pointer updated
2114 1 curly bracketing error (too few arguments)
2115 2 too many arguments (only if check_end is set); message set
2116 3 other error (expansion failure)
2120 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2121 BOOL check_end, uschar *name, BOOL *resetok)
2123 const uschar *s = *sptr;
2125 Uskip_whitespace(&s);
2126 for (int i = 0; i < n; i++)
2132 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2133 "(min is %d)", name, m);
2139 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2141 if (*s++ != '}') return 1;
2142 Uskip_whitespace(&s);
2144 if (check_end && *s++ != '}')
2148 expand_string_message = string_sprintf("Too many arguments for '%s' "
2149 "(max is %d)", name, n);
2152 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2163 /*************************************************
2164 * Elaborate message for bad variable *
2165 *************************************************/
2167 /* For the "unknown variable" message, take a look at the variable's name, and
2168 give additional information about possible ACL variables. The extra information
2169 is added on to expand_string_message.
2171 Argument: the name of the variable
2176 check_variable_error_message(uschar *name)
2178 if (Ustrncmp(name, "acl_", 4) == 0)
2179 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2180 (name[4] == 'c' || name[4] == 'm')?
2182 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2183 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2185 US"user-defined ACL variables must start acl_c or acl_m");
2191 Load args from sub array to globals, and call acl_check().
2192 Sub array will be corrupted on return.
2194 Returns: OK access is granted by an ACCEPT verb
2195 DISCARD access is (apparently) granted by a DISCARD verb
2196 FAIL access is denied
2197 FAIL_DROP access is denied; drop the connection
2198 DEFER can't tell at the moment
2202 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2205 int sav_narg = acl_narg;
2207 uschar * dummy_logmsg;
2208 extern int acl_where;
2210 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2211 for (i = 0; i < nsub && sub[i+1]; i++)
2213 uschar * tmp = acl_arg[i];
2214 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2215 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2220 sub[i+1] = acl_arg[i];
2221 acl_arg[i++] = NULL;
2225 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2227 acl_narg>0 ? acl_arg[0] : US"<none>",
2228 acl_narg>1 ? " +more" : "");
2230 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2232 for (i = 0; i < nsub; i++)
2233 acl_arg[i] = sub[i+1]; /* restore old args */
2234 acl_narg = sav_narg;
2242 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2243 The given string is modified on return. Leading whitespace is skipped while
2244 looking for the opening wrap character, then the rest is scanned for the trailing
2245 (non-escaped) wrap character. A backslash in the string will act as an escape.
2247 A nul is written over the trailing wrap, and a pointer to the char after the
2248 leading wrap is returned.
2251 s String for de-wrapping
2252 wrap Two-char string, the first being the opener, second the closer wrapping
2255 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2259 dewrap(uschar * s, const uschar * wrap)
2263 BOOL quotesmode = wrap[0] == wrap[1];
2265 if (Uskip_whitespace(&p) == *wrap)
2271 if (*p == '\\') p++;
2272 else if (!quotesmode && *p == wrap[-1]) depth++;
2273 else if (*p == *wrap)
2284 expand_string_message = string_sprintf("missing '%c'", *wrap);
2289 /* Pull off the leading array or object element, returning
2290 a copy in an allocated string. Update the list pointer.
2292 The element may itself be an abject or array.
2293 Return NULL when the list is empty.
2297 json_nextinlist(const uschar ** list)
2299 unsigned array_depth = 0, object_depth = 0;
2300 const uschar * s = *list, * item;
2302 skip_whitespace(&s);
2305 *s && (*s != ',' || array_depth != 0 || object_depth != 0);
2309 case '[': array_depth++; break;
2310 case ']': array_depth--; break;
2311 case '{': object_depth++; break;
2312 case '}': object_depth--; break;
2314 *list = *s ? s+1 : s;
2315 if (item == s) return NULL;
2316 item = string_copyn(item, s - item);
2317 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2323 /************************************************/
2324 /* Return offset in ops table, or -1 if not found.
2325 Repoint to just after the operator in the string.
2328 ss string representation of operator
2329 opname split-out operator name
2333 identify_operator(const uschar ** ss, uschar ** opname)
2335 const uschar * s = *ss;
2338 /* Numeric comparisons are symbolic */
2340 if (*s == '=' || *s == '>' || *s == '<')
2352 /* All other conditions are named */
2355 s = read_name(name, sizeof(name), s, US"_");
2358 /* If we haven't read a name, it means some non-alpha character is first. */
2362 expand_string_message = string_sprintf("condition name expected, "
2363 "but found \"%.16s\"", s);
2367 *opname = string_copy(name);
2369 return chop_match(name, cond_table, nelem(cond_table));
2373 /*************************************************
2374 * Handle MD5 or SHA-1 computation for HMAC *
2375 *************************************************/
2377 /* These are some wrapping functions that enable the HMAC code to be a bit
2378 cleaner. A good compiler will spot the tail recursion.
2381 type HMAC_MD5 or HMAC_SHA1
2382 remaining are as for the cryptographic hash functions
2388 chash_start(int type, void * base)
2390 if (type == HMAC_MD5)
2391 md5_start((md5 *)base);
2393 sha1_start((hctx *)base);
2397 chash_mid(int type, void * base, const uschar * string)
2399 if (type == HMAC_MD5)
2400 md5_mid((md5 *)base, string);
2402 sha1_mid((hctx *)base, string);
2406 chash_end(int type, void * base, const uschar * string, int length,
2409 if (type == HMAC_MD5)
2410 md5_end((md5 *)base, string, length, digest);
2412 sha1_end((hctx *)base, string, length, digest);
2419 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2420 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2423 key encoding key, nul-terminated
2424 src data to be hashed, nul-terminated
2426 len size of output buffer
2430 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2433 const uschar * keyptr;
2435 unsigned int keylen;
2437 #define MD5_HASHLEN 16
2438 #define MD5_HASHBLOCKLEN 64
2440 uschar keyhash[MD5_HASHLEN];
2441 uschar innerhash[MD5_HASHLEN];
2442 uschar finalhash[MD5_HASHLEN];
2443 uschar innerkey[MD5_HASHBLOCKLEN];
2444 uschar outerkey[MD5_HASHBLOCKLEN];
2447 keylen = Ustrlen(keyptr);
2449 /* If the key is longer than the hash block length, then hash the key
2452 if (keylen > MD5_HASHBLOCKLEN)
2454 chash_start(HMAC_MD5, &md5_base);
2455 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2457 keylen = MD5_HASHLEN;
2460 /* Now make the inner and outer key values */
2462 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2463 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2465 for (int i = 0; i < keylen; i++)
2467 innerkey[i] ^= keyptr[i];
2468 outerkey[i] ^= keyptr[i];
2471 /* Now do the hashes */
2473 chash_start(HMAC_MD5, &md5_base);
2474 chash_mid(HMAC_MD5, &md5_base, innerkey);
2475 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2477 chash_start(HMAC_MD5, &md5_base);
2478 chash_mid(HMAC_MD5, &md5_base, outerkey);
2479 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2481 /* Encode the final hash as a hex string, limited by output buffer size */
2484 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2486 if (j-- <= 0) break;
2487 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2488 if (j-- <= 0) break;
2489 *p++ = hex_digits[finalhash[i] & 0x0f];
2493 #endif /*SUPPORT_SRS*/
2496 /*************************************************
2497 * Read and evaluate a condition *
2498 *************************************************/
2502 s points to the start of the condition text
2503 resetok points to a BOOL which is written false if it is unsafe to
2504 free memory. Certain condition types (acl) may have side-effect
2505 allocation which must be preserved.
2506 yield points to a BOOL to hold the result of the condition test;
2507 if NULL, we are just reading through a condition that is
2508 part of an "or" combination to check syntax, or in a state
2509 where the answer isn't required
2511 Returns: a pointer to the first character after the condition, or
2515 static const uschar *
2516 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2518 BOOL testfor = TRUE;
2519 BOOL tempcond, combined_cond;
2521 BOOL sub2_honour_dollar = TRUE;
2522 BOOL is_forany, is_json, is_jsons;
2524 int_eximarith_t num[2];
2525 struct stat statbuf;
2528 const uschar *sub[10];
2531 if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break;
2533 switch(cond_type = identify_operator(&s, &opname))
2535 /* def: tests for a non-empty variable, or for the existence of a header. If
2536 yield == NULL we are in a skipping state, and don't care about the answer. */
2544 expand_string_message = US"\":\" expected after \"def\"";
2548 s = read_name(name, sizeof(name), s+1, US"_");
2550 /* Test for a header's existence. If the name contains a closing brace
2551 character, this may be a user error where the terminating colon has been
2552 omitted. Set a flag to adjust a subsequent error message in this case. */
2554 if ( ( *(t = name) == 'h'
2555 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2557 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2560 s = read_header_name(name, sizeof(name), s);
2561 /* {-for-text-editors */
2562 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2564 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2567 /* Test for a variable's having a non-empty value. A non-existent variable
2568 causes an expansion failure. */
2572 if (!(t = find_variable(name, TRUE, yield == NULL, NULL)))
2574 expand_string_message = name[0]
2575 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2576 : US"variable name omitted after \"def:\"";
2577 check_variable_error_message(name);
2580 if (yield) *yield = (t[0] != 0) == testfor;
2587 /* first_delivery tests for first delivery attempt */
2589 case ECOND_FIRST_DELIVERY:
2590 if (yield) *yield = f.deliver_firsttime == testfor;
2594 /* queue_running tests for any process started by a queue runner */
2596 case ECOND_QUEUE_RUNNING:
2597 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2601 /* exists: tests for file existence
2602 isip: tests for any IP address
2603 isip4: tests for an IPv4 address
2604 isip6: tests for an IPv6 address
2605 pam: does PAM authentication
2606 radius: does RADIUS authentication
2607 ldapauth: does LDAP authentication
2608 pwcheck: does Cyrus SASL pwcheck authentication
2617 case ECOND_LDAPAUTH:
2620 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2622 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2623 if (!sub[0]) return NULL;
2624 /* {-for-text-editors */
2625 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2627 if (!yield) return s; /* No need to run the test if skipping */
2632 if ((expand_forbid & RDO_EXISTS) != 0)
2634 expand_string_message = US"File existence tests are not permitted";
2637 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2643 rc = string_is_ip_address(sub[0], NULL);
2644 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2645 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2648 /* Various authentication tests - all optionally compiled */
2652 rc = auth_call_pam(sub[0], &expand_string_message);
2655 goto COND_FAILED_NOT_COMPILED;
2656 #endif /* SUPPORT_PAM */
2659 #ifdef RADIUS_CONFIG_FILE
2660 rc = auth_call_radius(sub[0], &expand_string_message);
2663 goto COND_FAILED_NOT_COMPILED;
2664 #endif /* RADIUS_CONFIG_FILE */
2666 case ECOND_LDAPAUTH:
2669 /* Just to keep the interface the same */
2671 int old_pool = store_pool;
2672 store_pool = POOL_SEARCH;
2673 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2674 &expand_string_message, &do_cache);
2675 store_pool = old_pool;
2679 goto COND_FAILED_NOT_COMPILED;
2680 #endif /* LOOKUP_LDAP */
2683 #ifdef CYRUS_PWCHECK_SOCKET
2684 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2687 goto COND_FAILED_NOT_COMPILED;
2688 #endif /* CYRUS_PWCHECK_SOCKET */
2690 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2691 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2693 if (rc == ERROR || rc == DEFER) return NULL;
2694 *yield = (rc == OK) == testfor;
2700 /* call ACL (in a conditional context). Accept true, deny false.
2701 Defer is a forced-fail. Anything set by message= goes to $value.
2702 Up to ten parameters are used; we use the braces round the name+args
2703 like the saslauthd condition does, to permit a variable number of args.
2704 See also the expansion-item version EITEM_ACL and the traditional
2705 acl modifier ACLC_ACL.
2706 Since the ACL may allocate new global variables, tell our caller to not
2711 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2717 Uskip_whitespace(&s);
2718 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2720 switch(read_subs(sub, nelem(sub), 1,
2721 &s, yield == NULL, TRUE, name, resetok))
2723 case 1: expand_string_message = US"too few arguments or bracketing "
2726 case 3: return NULL;
2732 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2733 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2738 lookup_value = NULL;
2740 lookup_value = string_copy(user_msg);
2741 *yield = cond == testfor;
2745 f.expand_string_forcedfail = TRUE;
2748 expand_string_message = string_sprintf("%s from acl \"%s\"",
2749 rc_names[rc], sub[0]);
2757 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2759 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2761 However, the last two are optional. That is why the whole set is enclosed
2762 in their own set of braces. */
2764 case ECOND_SASLAUTHD:
2765 #ifndef CYRUS_SASLAUTHD_SOCKET
2766 goto COND_FAILED_NOT_COMPILED;
2770 Uskip_whitespace(&s);
2771 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2772 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, name,
2775 case 1: expand_string_message = US"too few arguments or bracketing "
2776 "error for saslauthd";
2778 case 3: return NULL;
2780 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2783 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2784 &expand_string_message);
2785 if (rc == ERROR || rc == DEFER) return NULL;
2786 *yield = (rc == OK) == testfor;
2790 #endif /* CYRUS_SASLAUTHD_SOCKET */
2793 /* symbolic operators for numeric and string comparison, and a number of
2794 other operators, all requiring two arguments.
2796 crypteq: encrypts plaintext and compares against an encrypted text,
2797 using crypt(), crypt16(), MD5 or SHA-1
2798 inlist/inlisti: checks if first argument is in the list of the second
2799 match: does a regular expression match and sets up the numerical
2800 variables if it succeeds
2801 match_address: matches in an address list
2802 match_domain: matches in a domain list
2803 match_ip: matches a host list that is restricted to IP addresses
2804 match_local_part: matches in a local part list
2807 case ECOND_MATCH_ADDRESS:
2808 case ECOND_MATCH_DOMAIN:
2809 case ECOND_MATCH_IP:
2810 case ECOND_MATCH_LOCAL_PART:
2811 #ifndef EXPAND_LISTMATCH_RHS
2812 sub2_honour_dollar = FALSE;
2821 case ECOND_NUM_L: /* Numerical comparisons */
2828 case ECOND_STR_LT: /* String comparisons */
2839 for (int i = 0; i < 2; i++)
2841 /* Sometimes, we don't expand substrings; too many insecure configurations
2842 created using match_address{}{} and friends, where the second param
2843 includes information from untrustworthy sources. */
2844 BOOL honour_dollar = TRUE;
2845 if ((i > 0) && !sub2_honour_dollar)
2846 honour_dollar = FALSE;
2848 if (Uskip_whitespace(&s) != '{')
2850 if (i == 0) goto COND_FAILED_CURLY_START;
2851 expand_string_message = string_sprintf("missing 2nd string in {} "
2852 "after \"%s\"", opname);
2855 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2856 honour_dollar, resetok)))
2858 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2859 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2860 " for security reasons\n");
2861 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2863 /* Convert to numerical if required; we know that the names of all the
2864 conditions that compare numbers do not start with a letter. This just saves
2865 checking for them individually. */
2867 if (!isalpha(opname[0]) && yield)
2872 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2876 num[i] = expanded_string_integer(sub[i], FALSE);
2877 if (expand_string_message) return NULL;
2881 /* Result not required */
2883 if (!yield) return s;
2885 /* Do an appropriate comparison */
2891 tempcond = (num[0] == num[1]); break;
2894 tempcond = (num[0] > num[1]); break;
2897 tempcond = (num[0] >= num[1]); break;
2900 tempcond = (num[0] < num[1]); break;
2903 tempcond = (num[0] <= num[1]); break;
2906 tempcond = (Ustrcmp(sub[0], sub[1]) < 0); break;
2909 tempcond = (strcmpic(sub[0], sub[1]) < 0); break;
2912 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0); break;
2915 tempcond = (strcmpic(sub[0], sub[1]) <= 0); break;
2918 tempcond = (Ustrcmp(sub[0], sub[1]) == 0); break;
2921 tempcond = (strcmpic(sub[0], sub[1]) == 0); break;
2924 tempcond = (Ustrcmp(sub[0], sub[1]) > 0); break;
2927 tempcond = (strcmpic(sub[0], sub[1]) > 0); break;
2930 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0); break;
2933 tempcond = (strcmpic(sub[0], sub[1]) >= 0); break;
2935 case ECOND_MATCH: /* Regular expression match */
2937 const pcre2_code * re;
2941 if (!(re = pcre2_compile((PCRE2_SPTR)sub[1], PCRE2_ZERO_TERMINATED,
2942 PCRE_COPT, &err, &offset, pcre_gen_cmp_ctx)))
2945 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
2946 expand_string_message = string_sprintf("regular expression error in "
2947 "\"%s\": %s at offset %ld", sub[1], errbuf, (long)offset);
2951 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2955 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2956 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0,
2957 CUSS &lookup_value);
2958 goto MATCHED_SOMETHING;
2960 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2961 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2962 MCL_DOMAIN + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
2963 goto MATCHED_SOMETHING;
2965 case ECOND_MATCH_IP: /* Match IP address in a host list */
2966 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2968 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2974 unsigned int *nullcache = NULL;
2975 check_host_block cb;
2977 cb.host_name = US"";
2978 cb.host_address = sub[0];
2980 /* If the host address starts off ::ffff: it is an IPv6 address in
2981 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2984 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2985 cb.host_address + 7 : cb.host_address;
2987 rc = match_check_list(
2988 &sub[1], /* the list */
2989 0, /* separator character */
2990 &hostlist_anchor, /* anchor pointer */
2991 &nullcache, /* cache pointer */
2992 check_host, /* function for testing */
2993 &cb, /* argument for function */
2994 MCL_HOST, /* type of check */
2995 sub[0], /* text for debugging */
2996 CUSS &lookup_value); /* where to pass back data */
2998 goto MATCHED_SOMETHING;
3000 case ECOND_MATCH_LOCAL_PART:
3001 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
3002 MCL_LOCALPART + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
3008 case OK: tempcond = TRUE; break;
3009 case FAIL: tempcond = FALSE; break;
3012 expand_string_message = string_sprintf("unable to complete match "
3013 "against \"%s\": %s", sub[1], search_error_message);
3019 /* Various "encrypted" comparisons. If the second string starts with
3020 "{" then an encryption type is given. Default to crypt() or crypt16()
3021 (build-time choice). */
3022 /* }-for-text-editors */
3025 #ifndef SUPPORT_CRYPTEQ
3026 goto COND_FAILED_NOT_COMPILED;
3028 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3030 int sublen = Ustrlen(sub[1]+5);
3035 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3037 /* If the length that we are comparing against is 24, the MD5 digest
3038 is expressed as a base64 string. This is the way LDAP does it. However,
3039 some other software uses a straightforward hex representation. We assume
3040 this if the length is 32. Other lengths fail. */
3044 uschar *coded = b64encode(CUS digest, 16);
3045 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3046 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3047 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3049 else if (sublen == 32)
3052 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3054 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3055 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3056 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3060 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3061 "fail\n crypted=%s\n", sub[1]+5);
3066 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3068 int sublen = Ustrlen(sub[1]+6);
3073 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3075 /* If the length that we are comparing against is 28, assume the SHA1
3076 digest is expressed as a base64 string. If the length is 40, assume a
3077 straightforward hex representation. Other lengths fail. */
3081 uschar *coded = b64encode(CUS digest, 20);
3082 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3083 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3084 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3086 else if (sublen == 40)
3089 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3091 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3092 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3093 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3097 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3098 "fail\n crypted=%s\n", sub[1]+6);
3103 else /* {crypt} or {crypt16} and non-{ at start */
3104 /* }-for-text-editors */
3109 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3114 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3119 else if (sub[1][0] == '{') /* }-for-text-editors */
3121 expand_string_message = string_sprintf("unknown encryption mechanism "
3122 "in \"%s\"", sub[1]);
3128 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3129 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3130 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3134 #define XSTR(s) STR(s)
3135 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3136 " subject=%s\n crypted=%s\n",
3137 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3142 /* If the encrypted string contains fewer than two characters (for the
3143 salt), force failure. Otherwise we get false positives: with an empty
3144 string the yield of crypt() is an empty string! */
3147 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3148 else if (errno == EINVAL)
3152 expand_string_message = string_sprintf("crypt error: %s\n",
3153 US strerror(errno));
3158 #endif /* SUPPORT_CRYPTEQ */
3163 const uschar * list = sub[1];
3165 uschar *save_iterate_item = iterate_item;
3166 int (*compare)(const uschar *, const uschar *);
3168 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3171 compare = cond_type == ECOND_INLISTI
3172 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3174 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3176 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3177 if (compare(sub[0], iterate_item) == 0)
3180 lookup_value = iterate_item;
3184 iterate_item = save_iterate_item;
3187 } /* Switch for comparison conditions */
3189 *yield = tempcond == testfor;
3190 return s; /* End of comparison conditions */
3193 /* and/or: computes logical and/or of several conditions */
3197 subcondptr = (yield == NULL) ? NULL : &tempcond;
3198 combined_cond = (cond_type == ECOND_AND);
3200 Uskip_whitespace(&s);
3201 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3205 /* {-for-text-editors */
3206 if (Uskip_whitespace(&s) == '}') break;
3207 if (*s != '{') /* }-for-text-editors */
3209 expand_string_message = string_sprintf("each subcondition "
3210 "inside an \"%s{...}\" condition must be in its own {}", opname);
3214 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3216 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3217 expand_string_message, opname);
3220 Uskip_whitespace(&s);
3222 /* {-for-text-editors */
3225 /* {-for-text-editors */
3226 expand_string_message = string_sprintf("missing } at end of condition "
3227 "inside \"%s\" group", opname);
3232 if (cond_type == ECOND_AND)
3234 combined_cond &= tempcond;
3235 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3236 } /* evaluate any more */
3239 combined_cond |= tempcond;
3240 if (combined_cond) subcondptr = NULL; /* once true, don't */
3241 } /* evaluate any more */
3244 if (yield) *yield = (combined_cond == testfor);
3248 /* forall/forany: iterates a condition with different values */
3250 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3251 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3252 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3253 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3254 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3255 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3259 const uschar * list;
3261 uschar *save_iterate_item = iterate_item;
3263 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3265 Uskip_whitespace(&s);
3266 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3267 if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok)))
3269 /* {-for-text-editors */
3270 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3272 Uskip_whitespace(&s);
3273 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3277 /* Call eval_condition once, with result discarded (as if scanning a
3278 "false" part). This allows us to find the end of the condition, because if
3279 the list it empty, we won't actually evaluate the condition for real. */
3281 if (!(s = eval_condition(sub[1], resetok, NULL)))
3283 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3284 expand_string_message, opname);
3287 Uskip_whitespace(&s);
3289 /* {-for-text-editors */
3292 /* {-for-text-editors */
3293 expand_string_message = string_sprintf("missing } at end of condition "
3294 "inside \"%s\"", opname);
3298 if (yield) *yield = !testfor;
3300 if (is_json) list = dewrap(string_copy(list), US"[]");
3301 while ((iterate_item = is_json
3302 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3305 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3307 expand_string_message =
3308 string_sprintf("%s wrapping string result for extract jsons",
3309 expand_string_message);
3310 iterate_item = save_iterate_item;
3314 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3315 if (!eval_condition(sub[1], resetok, &tempcond))
3317 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3318 expand_string_message, opname);
3319 iterate_item = save_iterate_item;
3322 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3323 tempcond? "true":"false");
3325 if (yield) *yield = (tempcond == testfor);
3326 if (tempcond == is_forany) break;
3329 iterate_item = save_iterate_item;
3334 /* The bool{} expansion condition maps a string to boolean.
3335 The values supported should match those supported by the ACL condition
3336 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3337 of true/false. Note that Router "condition" rules have a different
3338 interpretation, where general data can be used and only a few values
3340 Note that readconf.c boolean matching, for boolean configuration options,
3341 only matches true/yes/false/no.
3342 The bool_lax{} condition matches the Router logic, which is much more
3345 case ECOND_BOOL_LAX:
3351 BOOL boolvalue = FALSE;
3353 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3354 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3355 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3357 case 1: expand_string_message = string_sprintf(
3358 "too few arguments or bracketing error for %s",
3362 case 3: return NULL;
3365 Uskip_whitespace(&t);
3366 if ((len = Ustrlen(t)))
3368 /* trailing whitespace: seems like a good idea to ignore it too */
3370 while (isspace(*t2)) t2--;
3371 if (t2 != (t + len))
3378 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3379 /* logic for the lax case from expand_check_condition(), which also does
3380 expands, and the logic is both short and stable enough that there should
3381 be no maintenance burden from replicating it. */
3385 ? Ustrspn(t+1, "0123456789") == len-1
3386 : Ustrspn(t, "0123456789") == len)
3388 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3389 /* expand_check_condition only does a literal string "0" check */
3390 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3393 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3395 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3397 else if (cond_type == ECOND_BOOL_LAX)
3401 expand_string_message = string_sprintf("unrecognised boolean "
3405 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3406 boolvalue? "true":"false");
3407 if (yield) *yield = (boolvalue == testfor);
3412 case ECOND_INBOUND_SRS:
3413 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3416 const pcre2_code * re;
3417 pcre2_match_data * md;
3421 BOOL boolvalue = FALSE;
3423 switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, name, resetok))
3425 case 1: expand_string_message = US"too few arguments or bracketing "
3426 "error for inbound_srs";
3428 case 3: return NULL;
3431 /* Match the given local_part against the SRS-encoded pattern */
3433 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$",
3435 md = pcre2_match_data_create(4+1, pcre_gen_ctx);
3436 if (pcre2_match(re, sub[0], PCRE2_ZERO_TERMINATED, 0, PCRE_EOPT,
3437 md, pcre_gen_mtc_ctx) < 0)
3439 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3442 ovec = pcre2_get_ovector_pointer(md);
3444 if (sub[0][0] == '"')
3446 else for (uschar * s = sub[0]; *s; s++)
3447 if (!isalnum(*s) && Ustrchr(".!#$%&'*+-/=?^_`{|}~", *s) == NULL)
3448 { quoting = 1; break; }
3450 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
3452 /* Record the (quoted, if needed) decoded recipient as $srs_recipient */
3454 srs_recipient = string_sprintf("%.*s%.*S%.*s@%.*S", /* lowercased */
3456 (int) (ovec[9]-ovec[8]), sub[0] + ovec[8], /* substr 4 */
3458 (int) (ovec[7]-ovec[6]), sub[0] + ovec[6]); /* substr 3 */
3460 /* If a zero-length secret was given, we're done. Otherwise carry on
3461 and validate the given SRS local_part againt our secret. */
3469 /* check the timestamp */
3472 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3476 gettimeofday(&now, NULL);
3477 now.tv_sec /= 86400; /* days since epoch */
3479 /* Decode substring 2 from base32 to a number */
3481 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3483 uschar * t = Ustrchr(base32_chars, *ss++);
3484 d = d * 32 + (t - base32_chars);
3487 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3489 DEBUG(D_expand) debug_printf("SRS too old\n");
3494 /* check length of substring 1, the offered checksum */
3496 if (ovec[3]-ovec[2] != 4)
3498 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3502 /* Hash the address with our secret, and compare that computed checksum
3503 with the one extracted from the arg */
3505 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3506 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3508 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3514 /* pcre2_match_data_free(md); gen ctx needs no free */
3515 if (yield) *yield = (boolvalue == testfor);
3518 #endif /*SUPPORT_SRS*/
3520 /* Unknown condition */
3523 if (!expand_string_message || !*expand_string_message)
3524 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3526 } /* End switch on condition type */
3528 /* Missing braces at start and end of data */
3530 COND_FAILED_CURLY_START:
3531 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3534 COND_FAILED_CURLY_END:
3535 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3539 /* A condition requires code that is not compiled */
3541 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3542 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3543 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3544 COND_FAILED_NOT_COMPILED:
3545 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3554 /*************************************************
3555 * Save numerical variables *
3556 *************************************************/
3558 /* This function is called from items such as "if" that want to preserve and
3559 restore the numbered variables.
3562 save_expand_string points to an array of pointers to set
3563 save_expand_nlength points to an array of ints for the lengths
3565 Returns: the value of expand max to save
3569 save_expand_strings(const uschar **save_expand_nstring, int *save_expand_nlength)
3571 for (int i = 0; i <= expand_nmax; i++)
3573 save_expand_nstring[i] = expand_nstring[i];
3574 save_expand_nlength[i] = expand_nlength[i];
3581 /*************************************************
3582 * Restore numerical variables *
3583 *************************************************/
3585 /* This function restored saved values of numerical strings.
3588 save_expand_nmax the number of strings to restore
3589 save_expand_string points to an array of pointers
3590 save_expand_nlength points to an array of ints
3596 restore_expand_strings(int save_expand_nmax, const uschar **save_expand_nstring,
3597 int *save_expand_nlength)
3599 expand_nmax = save_expand_nmax;
3600 for (int i = 0; i <= expand_nmax; i++)
3602 expand_nstring[i] = save_expand_nstring[i];
3603 expand_nlength[i] = save_expand_nlength[i];
3611 /*************************************************
3612 * Handle yes/no substrings *
3613 *************************************************/
3615 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3616 alternative substrings that depend on whether or not the condition was true,
3617 or the lookup or extraction succeeded. The substrings always have to be
3618 expanded, to check their syntax, but "skipping" is set when the result is not
3619 needed - this avoids unnecessary nested lookups.
3622 skipping TRUE if we were skipping when this item was reached
3623 yes TRUE if the first string is to be used, else use the second
3624 save_lookup a value to put back into lookup_value before the 2nd expansion
3625 sptr points to the input string pointer
3626 yieldptr points to the output growable-string pointer
3627 type "lookup", "if", "extract", "run", "env", "listextract" or
3628 "certextract" for error message
3629 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3632 Returns: 0 OK; lookup_value has been reset to save_lookup
3634 2 expansion failed because of bracketing error
3638 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3639 gstring ** yieldptr, uschar *type, BOOL *resetok)
3642 const uschar *s = *sptr; /* Local value */
3643 uschar *sub1, *sub2;
3644 const uschar * errwhere;
3646 /* If there are no following strings, we substitute the contents of $value for
3647 lookups and for extractions in the success case. For the ${if item, the string
3648 "true" is substituted. In the fail case, nothing is substituted for all three
3651 if (skip_whitespace(&s) == '}')
3655 if (yes && !skipping)
3656 *yieldptr = string_catn(*yieldptr, US"true", 4);
3660 if (yes && lookup_value && !skipping)
3661 *yieldptr = string_cat(*yieldptr, lookup_value);
3662 lookup_value = save_lookup;
3668 /* The first following string must be braced. */
3672 errwhere = US"'yes' part did not start with '{'";
3676 /* Expand the first substring. Forced failures are noticed only if we actually
3677 want this string. Set skipping in the call in the fail case (this will always
3678 be the case if we were already skipping). */
3680 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3681 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3682 f.expand_string_forcedfail = FALSE;
3685 errwhere = US"'yes' part did not end with '}'";
3689 /* If we want the first string, add it to the output */
3692 *yieldptr = string_cat(*yieldptr, sub1);
3694 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3695 $value to what it was at the start of the item, so that it has this value
3696 during the second string expansion. For the call from "if" or "run" to this
3697 function, save_lookup is set to lookup_value, so that this statement does
3700 lookup_value = save_lookup;
3702 /* There now follows either another substring, or "fail", or nothing. This
3703 time, forced failures are noticed only if we want the second string. We must
3704 set skipping in the nested call if we don't want this string, or if we were
3705 already skipping. */
3707 if (skip_whitespace(&s) == '{')
3709 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3710 if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3711 f.expand_string_forcedfail = FALSE;
3714 errwhere = US"'no' part did not start with '{'";
3718 /* If we want the second string, add it to the output */
3721 *yieldptr = string_cat(*yieldptr, sub2);
3724 /* If there is no second string, but the word "fail" is present when the use of
3725 the second string is wanted, set a flag indicating it was a forced failure
3726 rather than a syntactic error. Swallow the terminating } in case this is nested
3727 inside another lookup or if or extract. */
3732 /* deconst cast ok here as source is s anyway */
3733 s = US read_name(name, sizeof(name), s, US"_");
3734 if (Ustrcmp(name, "fail") == 0)
3736 if (!yes && !skipping)
3738 Uskip_whitespace(&s);
3741 errwhere = US"did not close with '}' after forcedfail";
3744 expand_string_message =
3745 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3746 f.expand_string_forcedfail = TRUE;
3752 expand_string_message =
3753 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3758 /* All we have to do now is to check on the final closing brace. */
3760 skip_whitespace(&s);
3763 errwhere = US"did not close with '}'";
3769 /* Update the input pointer value before returning */
3774 /* Get here if there is a bracketing failure */
3775 expand_string_message = string_sprintf(
3776 "curly-bracket problem in conditional yes/no parsing: %s\n"
3777 " remaining string is '%s'", errwhere, --s);
3782 /* Get here for other failures */
3790 /********************************************************
3791 * prvs: Get last three digits of days since Jan 1, 1970 *
3792 ********************************************************/
3794 /* This is needed to implement the "prvs" BATV reverse
3797 Argument: integer "days" offset to add or substract to
3798 or from the current number of days.
3800 Returns: pointer to string containing the last three
3801 digits of the number of days since Jan 1, 1970,
3802 modified by the offset argument, NULL if there
3803 was an error in the conversion.
3808 prvs_daystamp(int day_offset)
3810 uschar * days = store_get(32, GET_UNTAINTED); /* Need at least 24 for cases */
3811 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3812 (time(NULL) + day_offset*86400)/86400);
3813 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3818 /********************************************************
3819 * prvs: perform HMAC-SHA1 computation of prvs bits *
3820 ********************************************************/
3822 /* This is needed to implement the "prvs" BATV reverse
3826 address RFC2821 Address to use
3827 key The key to use (must be less than 64 characters
3829 key_num Single-digit key number to use. Defaults to
3832 Returns: pointer to string containing the first three
3833 bytes of the final hash in hex format, NULL if
3834 there was an error in the process.
3838 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3840 gstring * hash_source;
3843 uschar innerhash[20];
3844 uschar finalhash[20];
3845 uschar innerkey[64];
3846 uschar outerkey[64];
3847 uschar *finalhash_hex;
3852 if (Ustrlen(key) > 64)
3855 hash_source = string_catn(NULL, key_num, 1);
3856 hash_source = string_catn(hash_source, daystamp, 3);
3857 hash_source = string_cat(hash_source, address);
3858 (void) string_from_gstring(hash_source);
3861 debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s);
3863 memset(innerkey, 0x36, 64);
3864 memset(outerkey, 0x5c, 64);
3866 for (int i = 0; i < Ustrlen(key); i++)
3868 innerkey[i] ^= key[i];
3869 outerkey[i] ^= key[i];
3872 chash_start(HMAC_SHA1, &h);
3873 chash_mid(HMAC_SHA1, &h, innerkey);
3874 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
3876 chash_start(HMAC_SHA1, &h);
3877 chash_mid(HMAC_SHA1, &h, outerkey);
3878 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
3880 /* Hashing is deemed sufficient to de-taint any input data */
3882 p = finalhash_hex = store_get(40, GET_UNTAINTED);
3883 for (int i = 0; i < 3; i++)
3885 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3886 *p++ = hex_digits[finalhash[i] & 0x0f];
3890 return finalhash_hex;
3896 /*************************************************
3897 * Join a file onto the output string *
3898 *************************************************/
3900 /* This is used for readfile/readsock and after a run expansion.
3901 It joins the contents of a file onto the output string, globally replacing
3902 newlines with a given string (optionally).
3906 yield pointer to the expandable string struct
3907 eol newline replacement string, or NULL
3909 Returns: new pointer for expandable string, terminated if non-null
3913 cat_file(FILE * f, gstring * yield, uschar * eol)
3915 uschar buffer[1024];
3917 while (Ufgets(buffer, sizeof(buffer), f))
3919 int len = Ustrlen(buffer);
3920 if (eol && buffer[len-1] == '\n') len--;
3921 yield = string_catn(yield, buffer, len);
3922 if (eol && buffer[len])
3923 yield = string_cat(yield, eol);
3931 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
3934 uschar buffer[1024];
3936 /*XXX could we read direct into a pre-grown string? */
3938 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
3939 for (uschar * s = buffer; rc--; s++)
3940 yield = eol && *s == '\n'
3941 ? string_cat(yield, eol) : string_catn(yield, s, 1);
3943 /* We assume that all errors, and any returns of zero bytes,
3944 are actually EOF. */
3951 /*************************************************
3952 * Evaluate numeric expression *
3953 *************************************************/
3955 /* This is a set of mutually recursive functions that evaluate an arithmetic
3956 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3957 these functions that is called from elsewhere is eval_expr, whose interface is:
3960 sptr pointer to the pointer to the string - gets updated
3961 decimal TRUE if numbers are to be assumed decimal
3962 error pointer to where to put an error message - must be NULL on input
3963 endket TRUE if ')' must terminate - FALSE for external call
3965 Returns: on success: the value of the expression, with *error still NULL
3966 on failure: an undefined value, with *error = a message
3969 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
3972 static int_eximarith_t
3973 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
3976 int_eximarith_t x = eval_op_or(&s, decimal, error);
3981 *error = US"expecting closing parenthesis";
3983 while (isspace(*++s));
3985 *error = US"expecting operator";
3991 static int_eximarith_t
3992 eval_number(uschar **sptr, BOOL decimal, uschar **error)
3998 if (isdigit((c = Uskip_whitespace(&s))))
4001 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4003 switch (tolower(*s))
4006 case 'k': n *= 1024; s++; break;
4007 case 'm': n *= 1024*1024; s++; break;
4008 case 'g': n *= 1024*1024*1024; s++; break;
4010 Uskip_whitespace(&s);
4015 n = eval_expr(&s, decimal, error, 1);
4019 *error = US"expecting number or opening parenthesis";
4027 static int_eximarith_t
4028 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4032 Uskip_whitespace(&s);
4033 if (*s == '+' || *s == '-' || *s == '~')
4036 x = eval_op_unary(&s, decimal, error);
4037 if (op == '-') x = -x;
4038 else if (op == '~') x = ~x;
4041 x = eval_number(&s, decimal, error);
4048 static int_eximarith_t
4049 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4052 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4055 while (*s == '*' || *s == '/' || *s == '%')
4058 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4060 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4061 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4062 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4063 * -N*M is INT_MIN will yield INT_MIN.
4064 * Since we don't support floating point, this is somewhat simpler.
4065 * Ideally, we'd return an error, but since we overflow for all other
4066 * arithmetic, consistency suggests otherwise, but what's the correct value
4067 * to use? There is none.
4068 * The C standard guarantees overflow for unsigned arithmetic but signed
4069 * overflow invokes undefined behaviour; in practice, this is overflow
4070 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4071 * that long/longlong larger than int are available, or we could just work
4072 * with larger types. We should consider whether to guarantee 32bit eval
4073 * and 64-bit working variables, with errors returned. For now ...
4074 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4075 * can just let the other invalid results occur otherwise, as they have
4076 * until now. For this one case, we can coerce.
4078 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4081 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4082 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4092 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4108 static int_eximarith_t
4109 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4112 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4115 while (*s == '+' || *s == '-')
4118 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4120 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4121 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4122 { /* over-conservative check */
4124 ? US"overflow in sum" : US"overflow in difference";
4127 if (op == '+') x += y; else x -= y;
4135 static int_eximarith_t
4136 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4139 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4142 while ((*s == '<' || *s == '>') && s[1] == s[0])
4147 y = eval_op_sum(&s, decimal, error);
4149 if (op == '<') x <<= y; else x >>= y;
4157 static int_eximarith_t
4158 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4161 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4168 y = eval_op_shift(&s, decimal, error);
4178 static int_eximarith_t
4179 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4182 int_eximarith_t x = eval_op_and(&s, decimal, error);
4189 y = eval_op_and(&s, decimal, error);
4199 static int_eximarith_t
4200 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4203 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4210 y = eval_op_xor(&s, decimal, error);
4221 /************************************************/
4222 /* Comparison operation for sort expansion. We need to avoid
4223 re-expanding the fields being compared, so need a custom routine.
4226 cond_type Comparison operator code
4227 leftarg, rightarg Arguments for comparison
4229 Return true iff (leftarg compare rightarg)
4233 sortsbefore(int cond_type, BOOL alpha_cond,
4234 const uschar * leftarg, const uschar * rightarg)
4236 int_eximarith_t l_num, r_num;
4240 l_num = expanded_string_integer(leftarg, FALSE);
4241 if (expand_string_message) return FALSE;
4242 r_num = expanded_string_integer(rightarg, FALSE);
4243 if (expand_string_message) return FALSE;
4247 case ECOND_NUM_G: return l_num > r_num;
4248 case ECOND_NUM_GE: return l_num >= r_num;
4249 case ECOND_NUM_L: return l_num < r_num;
4250 case ECOND_NUM_LE: return l_num <= r_num;
4257 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4258 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4259 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4260 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4261 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4262 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4263 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4264 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4267 return FALSE; /* should not happen */
4271 /* Expand a named list. Return false on failure. */
4273 expand_listnamed(gstring * yield, const uschar * name, const uschar * listtype)
4275 tree_node *t = NULL;
4276 const uschar * list;
4279 BOOL needsep = FALSE;
4280 #define LISTNAMED_BUF_SIZE 256
4281 uschar b[LISTNAMED_BUF_SIZE];
4282 uschar * buffer = b;
4284 if (*name == '+') name++;
4285 if (!listtype) /* no-argument version */
4287 if ( !(t = tree_search(addresslist_anchor, name))
4288 && !(t = tree_search(domainlist_anchor, name))
4289 && !(t = tree_search(hostlist_anchor, name)))
4290 t = tree_search(localpartlist_anchor, name);
4292 else switch(*listtype) /* specific list-type version */
4294 case 'a': t = tree_search(addresslist_anchor, name); break;
4295 case 'd': t = tree_search(domainlist_anchor, name); break;
4296 case 'h': t = tree_search(hostlist_anchor, name); break;
4297 case 'l': t = tree_search(localpartlist_anchor, name); break;
4299 expand_string_message = US"bad suffix on \"list\" operator";
4305 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
4307 : *listtype=='a'?"address "
4308 : *listtype=='d'?"domain "
4309 : *listtype=='h'?"host "
4310 : *listtype=='l'?"localpart "
4315 list = ((namedlist_block *)(t->data.ptr))->string;
4317 /* The list could be quite long so we (re)use a buffer for each element
4318 rather than getting each in new memory */
4320 if (is_tainted(list)) buffer = store_get(LISTNAMED_BUF_SIZE, GET_TAINTED);
4321 while ((item = string_nextinlist(&list, &sep, buffer, LISTNAMED_BUF_SIZE)))
4323 uschar * buf = US" : ";
4325 yield = string_catn(yield, buf, 3);
4329 if (*item == '+') /* list item is itself a named list */
4331 yield = expand_listnamed(yield, item, listtype);
4332 if (expand_string_message)
4336 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
4339 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
4341 for(char * cp; cp = strpbrk(CCS item, tok); item = US cp)
4343 yield = string_catn(yield, item, cp - CS item);
4344 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
4345 yield = string_catn(yield, US"::", 2);
4346 else /* sep in item; should already be doubled; emit once */
4348 yield = string_catn(yield, US tok, 1);
4349 if (*cp == sep) cp++;
4352 yield = string_cat(yield, item);
4355 yield = string_cat(yield, item);
4362 /************************************************/
4364 debug_expansion_interim(const uschar * what, const uschar * value, int nchar,
4368 debug_printf_indent("|");
4370 debug_printf_indent(UTF8_VERT_RIGHT);
4372 for (int fill = 11 - Ustrlen(what); fill > 0; fill--)
4376 debug_printf(UTF8_HORIZ);
4378 debug_printf("%s: %.*s\n", what, nchar, value);
4379 if (is_tainted(value))
4382 debug_printf_indent("%s \\__", skipping ? "| " : " ");
4384 debug_printf_indent("%s",
4386 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
4387 debug_printf("(tainted)\n");
4392 /*************************************************
4394 *************************************************/
4396 /* Returns either an unchanged string, or the expanded string in stacking pool
4397 store. Interpreted sequences are:
4399 \... normal escaping rules
4400 $name substitutes the variable
4402 ${op:string} operates on the expanded string value
4403 ${item{arg1}{arg2}...} expands the args and then does the business
4404 some literal args are not enclosed in {}
4406 There are now far too many operators and item types to make it worth listing
4407 them here in detail any more.
4409 We use an internal routine recursively to handle embedded substrings. The
4410 external function follows. The yield is NULL if the expansion failed, and there
4411 are two cases: if something collapsed syntactically, or if "fail" was given
4412 as the action on a lookup failure. These can be distinguished by looking at the
4413 variable expand_string_forcedfail, which is TRUE in the latter case.
4415 The skipping flag is set true when expanding a substring that isn't actually
4416 going to be used (after "if" or "lookup") and it prevents lookups from
4417 happening lower down.
4419 Store usage: At start, a store block of the length of the input plus 64
4420 is obtained. This is expanded as necessary by string_cat(), which might have to
4421 get a new block, or might be able to expand the original. At the end of the
4422 function we can release any store above that portion of the yield block that
4423 was actually used. In many cases this will be optimal.
4425 However: if the first item in the expansion is a variable name or header name,
4426 we reset the store before processing it; if the result is in fresh store, we
4427 use that without copying. This is helpful for expanding strings like
4428 $message_headers which can get very long.
4430 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4431 since resetting the store at the end of the expansion will free store that was
4432 allocated by the plugin code as well as the slop after the expanded string. So
4433 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4434 and, given the acl condition, ${if }. This is an unfortunate consequence of
4435 string expansion becoming too powerful.
4438 string the string to be expanded
4439 ket_ends true if expansion is to stop at }
4440 left if not NULL, a pointer to the first character after the
4441 expansion is placed here (typically used with ket_ends)
4442 skipping TRUE for recursive calls when the value isn't actually going
4443 to be used (to allow for optimisation)
4444 honour_dollar TRUE if $ is to be expanded,
4445 FALSE if it's just another character
4446 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4449 Returns: NULL if expansion fails:
4450 expand_string_forcedfail is set TRUE if failure was forced
4451 expand_string_message contains a textual error message
4452 a pointer to the expanded string on success
4456 expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left,
4457 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p)
4459 rmark reset_point = store_mark();
4460 gstring * yield = string_get(Ustrlen(string) + 64);
4462 const uschar * s = string;
4463 const uschar * save_expand_nstring[EXPAND_MAXN+1];
4464 int save_expand_nlength[EXPAND_MAXN+1];
4465 BOOL resetok = TRUE, first = TRUE;
4468 f.expand_string_forcedfail = FALSE;
4469 expand_string_message = US"";
4471 if (is_tainted(string))
4473 expand_string_message =
4474 string_sprintf("attempt to expand tainted string '%s'", s);
4475 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
4486 debug_printf_indent("%c%s: %s\n",
4488 skipping ? "---scanning" : "considering", s);
4490 debug_printf_indent("%s%s: %s\n",
4491 first ? UTF8_DOWN_RIGHT : UTF8_VERT_RIGHT,
4493 ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning"
4499 /* \ escapes the next character, which must exist, or else
4500 the expansion fails. There's a special escape, \N, which causes
4501 copying of the subject verbatim up to the next \N. Otherwise,
4502 the escapes are the standard set. */
4508 expand_string_message = US"\\ at end of string";
4514 const uschar * t = s + 2;
4515 for (s = t; *s ; s++) if (*s == '\\' && s[1] == 'N') break;
4518 debug_expansion_interim(US"protected", t, (int)(s - t), skipping);
4519 yield = string_catn(yield, t, s - t);
4527 debug_printf_indent("|backslashed: '\\%c'\n", s[1]);
4529 debug_printf_indent(UTF8_VERT_RIGHT "backslashed: '\\%c'\n", s[1]);
4530 ch[0] = string_interpret_escape(&s);
4532 yield = string_catn(yield, ch, 1);
4538 /* Anything other than $ is just copied verbatim, unless we are
4539 looking for a terminating } character. */
4541 if (ket_ends && *s == '}') break;
4543 if (*s != '$' || !honour_dollar)
4546 for (const uschar * t = s+1;
4547 *t && *t != '$' && *t != '}' && *t != '\\'; t++) i++;
4549 DEBUG(D_expand) debug_expansion_interim(US"text", s, i, skipping);
4551 yield = string_catn(yield, s, i);
4556 /* No { after the $ - must be a plain name or a number for string
4557 match variable. There has to be a fudge for variables that are the
4558 names of header fields preceded by "$header_" because header field
4559 names can contain any printing characters except space and colon.
4560 For those that don't like typing this much, "$h_" is a synonym for
4561 "$header_". A non-existent header yields a NULL value; nothing is
4566 const uschar * value;
4567 int newsize = 0, len;
4571 s = read_name(name, sizeof(name), s, US"_");
4573 /* If this is the first thing to be expanded, release the pre-allocated
4577 g = store_get(sizeof(gstring), GET_UNTAINTED);
4578 else if (yield->ptr == 0)
4580 if (resetok) reset_point = store_reset(reset_point);
4582 reset_point = store_mark();
4583 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
4588 if ( ( *(t = name) == 'h'
4589 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4591 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4594 unsigned flags = *name == 'r' ? FH_WANT_RAW
4595 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4597 const uschar * charset = *name == 'b' ? NULL : headers_charset;
4599 s = read_header_name(name, sizeof(name), s);
4600 value = find_header(name, &newsize, flags, charset);
4602 /* If we didn't find the header, and the header contains a closing brace
4603 character, this may be a user error where the terminating colon
4604 has been omitted. Set a flag to adjust the error message in this case.
4605 But there is no error here - nothing gets inserted. */
4609 if (Ustrchr(name, '}')) malformed_header = TRUE;
4616 else if (!(value = find_variable(name, FALSE, skipping, &newsize)))
4618 expand_string_message =
4619 string_sprintf("unknown variable name \"%s\"", name);
4620 check_variable_error_message(name);
4624 /* If the data is known to be in a new buffer, newsize will be set to the
4625 size of that buffer. If this is the first thing in an expansion string,
4626 yield will be NULL; just point it at the new store instead of copying. Many
4627 expansion strings contain just one reference, so this is a useful
4628 optimization, especially for humungous headers. We need to use a gstring
4629 structure that is not allocated after that new-buffer, else a later store
4630 reset in the middle of the buffer will make it inaccessible. */
4632 len = Ustrlen(value);
4633 if (!yield && newsize != 0)
4636 yield->size = newsize;
4638 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
4641 yield = string_catn(yield, value, len);
4649 s = read_cnumber(&n, s);
4650 if (n >= 0 && n <= expand_nmax)
4651 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4655 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4657 if (*s != '{') /*}*/
4659 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4663 /* After { there can be various things, but they all start with
4664 an initial word, except for a number for a string match variable. */ /*}*/
4669 s = read_cnumber(&n, s); /*{{*/
4672 expand_string_message = US"} expected after number";
4675 if (n >= 0 && n <= expand_nmax)
4676 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4682 expand_string_message = US"letter or digit expected after ${"; /*}*/
4686 /* Allow "-" in names to cater for substrings with negative
4687 arguments. Since we are checking for known names after { this is
4690 s = read_name(name, sizeof(name), s, US"_-");
4691 item_type = chop_match(name, item_table, nelem(item_table));
4693 /* Switch on item type. All nondefault choices should "continue* when
4694 skipping, but "break" otherwise so we get debug output for the item
4697 int start = gstring_length(yield);
4700 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4701 If the ACL returns accept or reject we return content set by "message ="
4702 There is currently no limit on recursion; this would have us call
4703 acl_check_internal() directly and get a current level from somewhere.
4704 See also the acl expansion condition ECOND_ACL and the traditional
4705 acl modifier ACLC_ACL.
4706 Assume that the function has side-effects on the store that must be preserved.
4710 /* ${acl {name} {arg1}{arg2}...} */
4712 uschar * sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4716 switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, name,
4719 case 1: goto EXPAND_FAILED_CURLY;
4721 case 3: goto EXPAND_FAILED;
4723 if (skipping) continue;
4726 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4731 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4733 yield = string_cat(yield, user_msg);
4737 f.expand_string_forcedfail = TRUE;
4740 expand_string_message = string_sprintf("%s from acl \"%s\"",
4741 rc_names[rc], sub[0]);
4747 case EITEM_AUTHRESULTS:
4748 /* ${authresults {mysystemname}} */
4750 uschar * sub_arg[1];
4752 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4755 case 1: goto EXPAND_FAILED_CURLY;
4757 case 3: goto EXPAND_FAILED;
4760 yield = string_append(yield, 3,
4761 US"Authentication-Results: ", sub_arg[0], US"; none");
4764 yield = authres_local(yield, sub_arg[0]);
4765 yield = authres_iprev(yield);
4766 yield = authres_smtpauth(yield);
4768 yield = authres_spf(yield);
4770 #ifndef DISABLE_DKIM
4771 yield = authres_dkim(yield);
4773 #ifdef SUPPORT_DMARC
4774 yield = authres_dmarc(yield);
4776 #ifdef EXPERIMENTAL_ARC
4777 yield = authres_arc(yield);
4782 /* Handle conditionals - preserve the values of the numerical expansion
4783 variables in case they get changed by a regular expression match in the
4784 condition. If not, they retain their external settings. At the end
4785 of this "if" section, they get restored to their previous values. */
4790 const uschar *next_s;
4791 int save_expand_nmax =
4792 save_expand_strings(save_expand_nstring, save_expand_nlength);
4793 uschar * save_lookup_value = lookup_value;
4795 Uskip_whitespace(&s);
4796 if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond)))
4797 goto EXPAND_FAILED; /* message already set */
4801 debug_expansion_interim(US"condition", s, (int)(next_s - s), skipping);
4802 debug_expansion_interim(US"result",
4803 cond ? US"true" : US"false", cond ? 4 : 5, skipping);
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 lookup_value = save_lookup_value;
4828 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4829 save_expand_nlength);
4834 case EITEM_IMAPFOLDER:
4835 { /* ${imapfolder {name}{sep}{specials}} */
4839 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4842 case 1: goto EXPAND_FAILED_CURLY;
4844 case 3: goto EXPAND_FAILED;
4847 if (!sub_arg[1]) /* One argument */
4849 sub_arg[1] = US"/"; /* default separator */
4852 else if (Ustrlen(sub_arg[1]) != 1)
4854 expand_string_message =
4856 "IMAP folder separator must be one character, found \"%s\"",
4861 if (skipping) continue;
4863 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4864 sub_arg[1][0], sub_arg[2], &expand_string_message)))
4866 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);
4955 expand_string_message = string_sprintf("a single key was given for "
4956 "lookup type \"%s\", which is not a single-key lookup type", name);
4960 /* Get the next string in brackets and expand it. It is the file name for
4961 single-key+file lookups, and the whole query otherwise. In the case of
4962 queries that also require a file name (e.g. sqlite), the file name comes
4967 expand_string_message = US"missing '{' for lookup file-or-query arg";
4968 goto EXPAND_FAILED_CURLY; /*}}*/
4970 if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
4975 expand_string_message = US"missing '}' closing lookup file-or-query arg";
4976 goto EXPAND_FAILED_CURLY;
4978 Uskip_whitespace(&s);
4980 /* If this isn't a single-key+file lookup, re-arrange the variables
4981 to be appropriate for the search_ functions. For query-style lookups,
4982 there is just a "key", and no file name. For the special query-style +
4983 file types, the query (i.e. "key") starts with a file name. */
4986 key = search_args(stype, name, filename, &filename, opts);
4988 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4989 the entry was not found. Note that there is no search_close() function.
4990 Files are left open in case of re-use. At suitable places in higher logic,
4991 search_tidyup() is called to tidy all open files. This can save opening
4992 the same file several times. However, files may also get closed when
4993 others are opened, if too many are open at once. The rule is that a
4994 handle should not be used after a second search_open().
4996 Request that a partial search sets up $1 and maybe $2 by passing
4997 expand_setup containing zero. If its value changes, reset expand_nmax,
4998 since new variables will have been set. Note that at the end of this
4999 "lookup" section, the old numeric variables are restored. */
5002 lookup_value = NULL;
5005 void * handle = search_open(filename, stype, 0, NULL, NULL);
5008 expand_string_message = search_error_message;
5011 lookup_value = search_find(handle, filename, key, partial, affix,
5012 affixlen, starflags, &expand_setup, opts);
5013 if (f.search_find_defer)
5015 expand_string_message =
5016 string_sprintf("lookup of \"%s\" gave DEFER: %s",
5017 string_printing2(key, SP_TAB), search_error_message);
5020 if (expand_setup > 0) expand_nmax = expand_setup;
5023 /* The handling of "yes" and "no" result strings is now in a separate
5024 function that is also used by ${if} and ${extract}. */
5026 switch(process_yesno(
5027 skipping, /* were previously skipping */
5028 lookup_value != NULL, /* success/failure indicator */
5029 save_lookup_value, /* value to reset for string2 */
5030 &s, /* input pointer */
5031 &yield, /* output pointer */
5032 US"lookup", /* condition type */
5035 case 1: goto EXPAND_FAILED; /* when all is well, the */
5036 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5039 /* Restore external setting of expansion variables for carrying on
5040 at this level, and continue. */
5042 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5043 save_expand_nlength);
5045 if (skipping) continue;
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];
5065 gstring * new_yield;
5067 if (expand_forbid & RDO_PERL)
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 */
5142 uschar * sub_arg[3], * p, * domain;
5144 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, name, &resetok))
5146 case 1: goto EXPAND_FAILED_CURLY;
5148 case 3: goto EXPAND_FAILED;
5151 /* If skipping, we don't actually do anything */
5152 if (skipping) continue;
5154 /* sub_arg[0] is the address */
5155 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5156 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5158 expand_string_message = US"prvs first argument must be a qualified email address";
5162 /* Calculate the hash. The third argument must be a single-digit
5163 key number, or unset. */
5166 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5168 expand_string_message = US"prvs third argument must be a single digit";
5172 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5175 expand_string_message = US"prvs hmac-sha1 conversion failed";
5179 /* Now separate the domain from the local part */
5182 yield = string_catn(yield, US"prvs=", 5);
5183 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5184 yield = string_catn(yield, prvs_daystamp(7), 3);
5185 yield = string_catn(yield, p, 6);
5186 yield = string_catn(yield, US"=", 1);
5187 yield = string_cat (yield, sub_arg[0]);
5188 yield = string_catn(yield, US"@", 1);
5189 yield = string_cat (yield, domain);
5194 /* Check a prvs-encoded address for validity */
5196 case EITEM_PRVSCHECK:
5198 uschar * sub_arg[3], * p;
5200 const pcre2_code * re;
5202 /* TF: Ugliness: We want to expand parameter 1 first, then set
5203 up expansion variables that are used in the expansion of
5204 parameter 2. So we clone the string for the first
5205 expansion, where we only expand parameter 1.
5207 PH: Actually, that isn't necessary. The read_subs() function is
5208 designed to work this way for the ${if and ${lookup expansions. I've
5212 /* Reset expansion variables */
5213 prvscheck_result = NULL;
5214 prvscheck_address = NULL;
5215 prvscheck_keynum = NULL;
5217 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5219 case 1: goto EXPAND_FAILED_CURLY;
5221 case 3: goto EXPAND_FAILED;
5224 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5227 if (regex_match_and_setup(re,sub_arg[0],0,-1))
5229 uschar * local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
5230 uschar * key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
5231 uschar * daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
5232 uschar * hash = string_copyn(expand_nstring[3],expand_nlength[3]);
5233 uschar * domain = string_copyn(expand_nstring[5],expand_nlength[5]);
5235 DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part);
5236 DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num);
5237 DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5238 DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash);
5239 DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain);
5241 /* Set up expansion variables */
5242 g = string_cat (NULL, local_part);
5243 g = string_catn(g, US"@", 1);
5244 g = string_cat (g, domain);
5245 prvscheck_address = string_from_gstring(g);
5246 prvscheck_keynum = string_copy(key_num);
5248 /* Now expand the second argument */
5249 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5251 case 1: goto EXPAND_FAILED_CURLY;
5253 case 3: goto EXPAND_FAILED;
5256 /* Now we have the key and can check the address. */
5258 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5263 expand_string_message = US"hmac-sha1 conversion failed";
5267 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5268 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5270 if (Ustrcmp(p,hash) == 0)
5272 /* Success, valid BATV address. Now check the expiry date. */
5273 uschar *now = prvs_daystamp(0);
5274 unsigned int inow = 0,iexpire = 1;
5276 (void)sscanf(CS now,"%u",&inow);
5277 (void)sscanf(CS daystamp,"%u",&iexpire);
5279 /* When "iexpire" is < 7, a "flip" has occurred.
5280 Adjust "inow" accordingly. */
5281 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5283 if (iexpire >= inow)
5285 prvscheck_result = US"1";
5286 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n");
5290 prvscheck_result = NULL;
5291 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n");
5296 prvscheck_result = NULL;
5297 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n");
5300 /* Now expand the final argument. We leave this till now so that
5301 it can include $prvscheck_result. */
5303 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, name, &resetok))
5305 case 1: goto EXPAND_FAILED_CURLY;
5307 case 3: goto EXPAND_FAILED;
5310 yield = string_cat(yield,
5311 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5313 /* Reset the "internal" variables afterwards, because they are in
5314 dynamic store that will be reclaimed if the expansion succeeded. */
5316 prvscheck_address = NULL;
5317 prvscheck_keynum = NULL;
5320 /* Does not look like a prvs encoded address, return the empty string.
5321 We need to make sure all subs are expanded first, so as to skip over
5324 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5326 case 1: goto EXPAND_FAILED_CURLY;
5328 case 3: goto EXPAND_FAILED;
5331 if (skipping) continue;
5335 /* Handle "readfile" to insert an entire file */
5337 case EITEM_READFILE:
5340 uschar * sub_arg[2];
5342 if ((expand_forbid & RDO_READFILE) != 0)
5344 expand_string_message = US"file insertions are not permitted";
5348 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5350 case 1: goto EXPAND_FAILED_CURLY;
5352 case 3: goto EXPAND_FAILED;
5355 /* If skipping, we don't actually do anything */
5357 if (skipping) continue;
5359 /* Open the file and read it */
5361 if (!(f = Ufopen(sub_arg[0], "rb")))
5363 expand_string_message = string_open_failed("%s", sub_arg[0]);
5367 yield = cat_file(f, yield, sub_arg[1]);
5372 /* Handle "readsocket" to insert data from a socket, either
5373 Inet or Unix domain */
5375 case EITEM_READSOCK:
5378 uschar * sub_arg[4];
5380 if (expand_forbid & RDO_READSOCK)
5382 expand_string_message = US"socket insertions are not permitted";
5386 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5387 because there may be a string for expansion on failure. */
5389 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, name, &resetok))
5391 case 1: goto EXPAND_FAILED_CURLY;
5392 case 2: /* Won't occur: no end check */
5393 case 3: goto EXPAND_FAILED;
5396 /* If skipping, we don't actually do anything. Otherwise, arrange to
5397 connect to either an IP or a Unix socket. */
5401 int stype = search_findtype(US"readsock", 8);
5404 int expand_setup = -1;
5407 /* If the reqstr is empty, flag that and set a dummy */
5411 g = string_append_listele(g, ',', US"send=no");
5412 sub_arg[1] = US"DUMMY";
5415 /* Re-marshall the options */
5419 const uschar * list = sub_arg[2];
5423 /* First option has no tag and is timeout */
5424 if ((item = string_nextinlist(&list, &sep, NULL, 0)))
5425 g = string_append_listele(g, ',',
5426 string_sprintf("timeout=%s", item));
5428 /* The rest of the options from the expansion */
5429 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5430 g = string_append_listele(g, ',', item);
5432 /* possibly plus an EOL string. Process with escapes, to protect
5433 from list-processing. The only current user of eol= in search
5434 options is the readsock expansion. */
5436 if (sub_arg[3] && *sub_arg[3])
5437 g = string_append_listele(g, ',',
5438 string_sprintf("eol=%s",
5439 string_printing2(sub_arg[3], SP_TAB|SP_SPACE)));
5442 /* Gat a (possibly cached) handle for the connection */
5444 if (!(handle = search_open(sub_arg[0], stype, 0, NULL, NULL)))
5446 if (*expand_string_message) goto EXPAND_FAILED;
5447 expand_string_message = search_error_message;
5448 search_error_message = NULL;
5452 /* Get (possibly cached) results for the lookup */
5453 /* sspec: sub_arg[0] req: sub_arg[1] opts: g */
5455 if ((s = search_find(handle, sub_arg[0], sub_arg[1], -1, NULL, 0, 0,
5456 &expand_setup, string_from_gstring(g))))
5457 yield = string_cat(yield, s);
5458 else if (f.search_find_defer)
5460 expand_string_message = search_error_message;
5461 search_error_message = NULL;
5465 { /* should not happen, at present */
5466 expand_string_message = search_error_message;
5467 search_error_message = NULL;
5472 /* The whole thing has worked (or we were skipping). If there is a
5473 failure string following, we need to skip it. */
5475 if (*s == '{') /*}*/
5477 if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok))
5478 goto EXPAND_FAILED; /*{*/
5481 expand_string_message = US"missing '}' closing failstring for readsocket";
5482 goto EXPAND_FAILED_CURLY;
5484 Uskip_whitespace(&s);
5487 READSOCK_DONE: /*{*/
5490 expand_string_message = US"missing '}' closing readsocket";
5491 goto EXPAND_FAILED_CURLY;
5493 if (skipping) continue;
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. */
5520 const uschar * arg, ** argv;
5521 BOOL late_expand = TRUE;
5523 if ((expand_forbid & RDO_RUN) != 0)
5525 expand_string_message = US"running a command is not permitted";
5529 /* Handle options to the "run" */
5533 if (Ustrncmp(++s, "preexpand", 9) == 0)
5534 { late_expand = FALSE; s += 9; }
5537 const uschar * t = s;
5538 while (isalpha(*++t)) ;
5539 expand_string_message = string_sprintf("bad option '%.*s' for run",
5544 Uskip_whitespace(&s);
5546 if (*s != '{') /*}*/
5548 expand_string_message = US"missing '{' for command arg of run";
5549 goto EXPAND_FAILED_CURLY; /*"}*/
5553 if (late_expand) /* this is the default case */
5555 int n = Ustrcspn(s, "}");
5556 arg = skipping ? NULL : string_copyn(s, n);
5561 if (!(arg = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok)))
5563 Uskip_whitespace(&s);
5568 expand_string_message = US"missing '}' closing command arg of run";
5569 goto EXPAND_FAILED_CURLY;
5572 if (skipping) /* Just pretend it worked when we're skipping */
5575 lookup_value = NULL;
5582 if (!transport_set_up_command(&argv, /* anchor for arg list */
5583 arg, /* raw command */
5584 late_expand, /* expand args if not already done */
5585 0, /* not relevant when... */
5586 NULL, /* no transporting address */
5587 late_expand, /* allow tainted args, when expand-after-split */
5588 US"${run} expansion", /* for error messages */
5589 &expand_string_message)) /* where to put error message */
5592 /* Create the child process, making it a group leader. */
5594 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5595 US"expand-run")) < 0)
5597 expand_string_message =
5598 string_sprintf("couldn't create child process: %s", strerror(errno));
5602 /* Nothing is written to the standard input. */
5606 /* Read the pipe to get the command's output into $value (which is kept
5607 in lookup_value). Read during execution, so that if the output exceeds
5608 the OS pipe buffer limit, we don't block forever. Remember to not release
5609 memory just allocated for $value. */
5612 f = fdopen(fd_out, "rb");
5613 sigalrm_seen = FALSE;
5615 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5619 /* Wait for the process to finish, applying the timeout, and inspect its
5620 return code for serious disasters. Simple non-zero returns are passed on.
5623 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5625 if (sigalrm_seen || runrc == -256)
5627 expand_string_message = US"command timed out";
5628 killpg(pid, SIGKILL); /* Kill the whole process group */
5631 else if (runrc == -257)
5632 expand_string_message = string_sprintf("wait() failed: %s",
5636 expand_string_message = string_sprintf("command killed by signal %d",
5643 /* Process the yes/no strings; $value may be useful in both cases */
5645 switch(process_yesno(
5646 skipping, /* were previously skipping */
5647 runrc == 0, /* success/failure indicator */
5648 lookup_value, /* value to reset for string2 */
5649 &s, /* input pointer */
5650 &yield, /* output pointer */
5651 US"run", /* condition type */
5654 case 1: goto EXPAND_FAILED; /* when all is well, the */
5655 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5658 if (skipping) continue;
5662 /* Handle character translation for "tr" */
5666 int oldptr = gstring_length(yield);
5670 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5672 case 1: goto EXPAND_FAILED_CURLY;
5674 case 3: goto EXPAND_FAILED;
5677 yield = string_cat(yield, sub[0]);
5678 o2m = Ustrlen(sub[2]) - 1;
5680 if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++)
5682 uschar *m = Ustrrchr(sub[1], yield->s[oldptr]);
5686 yield->s[oldptr] = sub[2][(o < o2m)? o : o2m];
5690 if (skipping) continue;
5694 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5695 expanded arguments. */
5704 int val[2] = { 0, -1 };
5707 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5708 Ensure that sub[2] is set in the ${length } case. */
5711 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
5712 TRUE, name, &resetok))
5714 case 1: goto EXPAND_FAILED_CURLY;
5716 case 3: goto EXPAND_FAILED;
5719 /* Juggle the arguments if there are only two of them: always move the
5720 string to the last position and make ${length{n}{str}} equivalent to
5721 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5727 if (item_type == EITEM_LENGTH)
5734 for (int i = 0; i < 2; i++) if (sub[i])
5736 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5737 if (*ret != 0 || (i != 0 && val[i] < 0))
5739 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5740 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5746 item_type == EITEM_HASH
5747 ? compute_hash(sub[2], val[0], val[1], &len)
5748 : item_type == EITEM_NHASH
5749 ? compute_nhash(sub[2], val[0], val[1], &len)
5750 : extract_substr(sub[2], val[0], val[1], &len);
5753 yield = string_catn(yield, ret, len);
5754 if (skipping) continue;
5758 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5759 This code originally contributed by Steve Haslam. It currently supports
5760 the use of MD5 and SHA-1 hashes.
5762 We need some workspace that is large enough to handle all the supported
5763 hash types. Use macros to set the sizes rather than be too elaborate. */
5765 #define MAX_HASHLEN 20
5766 #define MAX_HASHBLOCKLEN 64
5775 int hashlen; /* Number of octets for the hash algorithm's output */
5776 int hashblocklen; /* Number of octets the hash algorithm processes */
5777 uschar * keyptr, * p;
5778 unsigned int keylen;
5780 uschar keyhash[MAX_HASHLEN];
5781 uschar innerhash[MAX_HASHLEN];
5782 uschar finalhash[MAX_HASHLEN];
5783 uschar finalhash_hex[2*MAX_HASHLEN];
5784 uschar innerkey[MAX_HASHBLOCKLEN];
5785 uschar outerkey[MAX_HASHBLOCKLEN];
5787 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5789 case 1: goto EXPAND_FAILED_CURLY;
5791 case 3: goto EXPAND_FAILED;
5794 if (skipping) continue;
5796 if (Ustrcmp(sub[0], "md5") == 0)
5799 use_base = &md5_base;
5803 else if (Ustrcmp(sub[0], "sha1") == 0)
5806 use_base = &sha1_ctx;
5812 expand_string_message =
5813 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5818 keylen = Ustrlen(keyptr);
5820 /* If the key is longer than the hash block length, then hash the key
5823 if (keylen > hashblocklen)
5825 chash_start(type, use_base);
5826 chash_end(type, use_base, keyptr, keylen, keyhash);
5831 /* Now make the inner and outer key values */
5833 memset(innerkey, 0x36, hashblocklen);
5834 memset(outerkey, 0x5c, hashblocklen);
5836 for (int i = 0; i < keylen; i++)
5838 innerkey[i] ^= keyptr[i];
5839 outerkey[i] ^= keyptr[i];
5842 /* Now do the hashes */
5844 chash_start(type, use_base);
5845 chash_mid(type, use_base, innerkey);
5846 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5848 chash_start(type, use_base);
5849 chash_mid(type, use_base, outerkey);
5850 chash_end(type, use_base, innerhash, hashlen, finalhash);
5852 /* Encode the final hash as a hex string */
5855 for (int i = 0; i < hashlen; i++)
5857 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5858 *p++ = hex_digits[finalhash[i] & 0x0f];
5861 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5862 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5864 yield = string_catn(yield, finalhash_hex, hashlen*2);
5868 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5869 We have to save the numerical variables and restore them afterwards. */
5873 const pcre2_code * re;
5874 int moffset, moffsetextra, slen;
5876 pcre2_match_data * md;
5878 uschar * subject, * sub[3];
5879 int save_expand_nmax =
5880 save_expand_strings(save_expand_nstring, save_expand_nlength);
5882 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5884 case 1: goto EXPAND_FAILED_CURLY;
5886 case 3: goto EXPAND_FAILED;
5888 if (skipping) continue;
5890 /* Compile the regular expression */
5892 if (!(re = pcre2_compile((PCRE2_SPTR)sub[1], PCRE2_ZERO_TERMINATED,
5893 PCRE_COPT, &err, &roffset, pcre_gen_cmp_ctx)))
5896 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
5897 expand_string_message = string_sprintf("regular expression error in "
5898 "\"%s\": %s at offset %ld", sub[1], errbuf, (long)roffset);
5901 md = pcre2_match_data_create(EXPAND_MAXN + 1, pcre_gen_ctx);
5903 /* Now run a loop to do the substitutions as often as necessary. It ends
5904 when there are no more matches. Take care over matches of the null string;
5905 do the same thing as Perl does. */
5908 slen = Ustrlen(sub[0]);
5909 moffset = moffsetextra = 0;
5914 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
5915 int n = pcre2_match(re, (PCRE2_SPTR)subject, slen, moffset + moffsetextra,
5916 PCRE_EOPT | emptyopt, md, pcre_gen_mtc_ctx);
5919 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5920 is not necessarily the end. We want to repeat the match from one
5921 character further along, but leaving the basic offset the same (for
5922 copying below). We can't be at the end of the string - that was checked
5923 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5924 finished; copy the remaining string and end the loop. */
5934 yield = string_catn(yield, subject+moffset, slen-moffset);
5938 /* Match - set up for expanding the replacement. */
5939 DEBUG(D_expand) debug_printf_indent("%s: match\n", name);
5941 if (n == 0) n = EXPAND_MAXN + 1;
5943 for (int nn = 0; nn < n*2; nn += 2)
5945 expand_nstring[expand_nmax] = subject + ovec[nn];
5946 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
5950 /* Copy the characters before the match, plus the expanded insertion. */
5952 yield = string_catn(yield, subject + moffset, ovec[0] - moffset);
5954 if (!(insert = expand_string(sub[2])))
5956 yield = string_cat(yield, insert);
5962 /* If we have matched an empty string, first check to see if we are at
5963 the end of the subject. If so, the loop is over. Otherwise, mimic
5964 what Perl's /g options does. This turns out to be rather cunning. First
5965 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5966 string at the same point. If this fails (picked up above) we advance to
5967 the next character. */
5969 if (ovec[0] == ovec[1])
5971 if (ovec[0] == slen) break;
5972 emptyopt = PCRE2_NOTEMPTY | PCRE2_ANCHORED;
5976 /* All done - restore numerical variables. */
5978 /* pcre2_match_data_free(md); gen ctx needs no free */
5979 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5980 save_expand_nlength);
5984 /* Handle keyed and numbered substring extraction. If the first argument
5985 consists entirely of digits, then a numerical extraction is assumed. */
5989 int field_number = 1;
5990 BOOL field_number_set = FALSE;
5991 uschar * save_lookup_value = lookup_value, * sub[3];
5992 int save_expand_nmax =
5993 save_expand_strings(save_expand_nstring, save_expand_nlength);
5995 /* On reflection the original behaviour of extract-json for a string
5996 result, leaving it quoted, was a mistake. But it was already published,
5997 hence the addition of jsons. In a future major version, make json
5998 work like josons, and withdraw jsons. */
6000 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
6002 /* Check for a format-variant specifier */
6004 if (Uskip_whitespace(&s) != '{') /*}*/
6005 if (Ustrncmp(s, "json", 4) == 0)
6006 if (*(s += 4) == 's')
6007 {fmt = extract_jsons; s++;}
6011 /* While skipping we cannot rely on the data for expansions being
6012 available (eg. $item) hence cannot decide on numeric vs. keyed.
6013 Read a maximum of 5 arguments (including the yes/no) */
6017 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
6019 if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))
6020 goto EXPAND_FAILED; /*'{'*/
6023 expand_string_message = US"missing '{' for arg of extract";
6024 goto EXPAND_FAILED_CURLY;
6026 Uskip_whitespace(&s);
6028 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
6029 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
6033 Uskip_whitespace(&s);
6037 expand_string_message = US"missing '}' closing extract";
6038 goto EXPAND_FAILED_CURLY;
6042 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6044 if (Uskip_whitespace(&s) == '{') /*'}'*/
6046 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
6047 goto EXPAND_FAILED; /*'{'*/
6050 expand_string_message = string_sprintf(
6051 "missing '}' closing arg %d of extract", i+1);
6052 goto EXPAND_FAILED_CURLY;
6055 /* After removal of leading and trailing white space, the first
6056 argument must not be empty; if it consists entirely of digits
6057 (optionally preceded by a minus sign), this is a numerical
6058 extraction, and we expect 3 arguments (normal) or 2 (json). */
6064 uschar * p = sub[0];
6066 Uskip_whitespace(&p);
6070 while (len > 0 && isspace(p[len-1])) len--;
6075 expand_string_message = US"first argument of \"extract\" must "
6085 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6089 if (fmt == extract_basic) j = 3; /* Need 3 args */
6090 field_number_set = TRUE;
6096 expand_string_message = string_sprintf(
6097 "missing '{' for arg %d of extract", i+1);
6098 goto EXPAND_FAILED_CURLY;
6102 /* Extract either the numbered or the keyed substring into $value. If
6103 skipping, just pretend the extraction failed. */
6106 lookup_value = NULL;
6110 lookup_value = field_number_set
6111 ? expand_gettokened(field_number, sub[1], sub[2])
6112 : expand_getkeyed(sub[0], sub[1]);
6119 const uschar * list;
6121 /* Array: Bracket-enclosed and comma-separated.
6122 Object: Brace-enclosed, comma-sep list of name:value pairs */
6124 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6126 expand_string_message =
6127 string_sprintf("%s wrapping %s for extract json",
6128 expand_string_message,
6129 field_number_set ? "array" : "object");
6130 goto EXPAND_FAILED_CURLY;
6134 if (field_number_set)
6136 if (field_number <= 0)
6138 expand_string_message = US"first argument of \"extract\" must "
6139 "be greater than zero";
6142 while (field_number > 0 && (item = json_nextinlist(&list)))
6144 if ((lookup_value = s = item))
6147 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6152 lookup_value = NULL;
6153 while ((item = json_nextinlist(&list)))
6155 /* Item is: string name-sep value. string is quoted.
6156 Dequote the string and compare with the search key. */
6158 if (!(item = dewrap(item, US"\"\"")))
6160 expand_string_message =
6161 string_sprintf("%s wrapping string key for extract json",
6162 expand_string_message);
6163 goto EXPAND_FAILED_CURLY;
6165 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6167 s = item + Ustrlen(item) + 1;
6168 if (Uskip_whitespace(&s) != ':')
6170 expand_string_message =
6171 US"missing object value-separator for extract json";
6172 goto EXPAND_FAILED_CURLY;
6175 Uskip_whitespace(&s);
6183 if ( fmt == extract_jsons
6185 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6187 expand_string_message =
6188 string_sprintf("%s wrapping string result for extract jsons",
6189 expand_string_message);
6190 goto EXPAND_FAILED_CURLY;
6195 /* If no string follows, $value gets substituted; otherwise there can
6196 be yes/no strings, as for lookup or if. */
6198 switch(process_yesno(
6199 skipping, /* were previously skipping */
6200 lookup_value != NULL, /* success/failure indicator */
6201 save_lookup_value, /* value to reset for string2 */
6202 &s, /* input pointer */
6203 &yield, /* output pointer */
6204 US"extract", /* condition type */
6207 case 1: goto EXPAND_FAILED; /* when all is well, the */
6208 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6211 /* All done - restore numerical variables. */
6213 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6214 save_expand_nlength);
6216 if (skipping) continue;
6220 /* return the Nth item from a list */
6222 case EITEM_LISTEXTRACT:
6224 int field_number = 1;
6225 uschar * save_lookup_value = lookup_value, * sub[2];
6226 int save_expand_nmax =
6227 save_expand_strings(save_expand_nstring, save_expand_nlength);
6229 /* Read the field & list arguments */
6231 for (int i = 0; i < 2; i++)
6233 if (Uskip_whitespace(&s) != '{') /*}*/
6235 expand_string_message = string_sprintf(
6236 "missing '{' for arg %d of listextract", i+1); /*}*/
6237 goto EXPAND_FAILED_CURLY;
6240 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6241 if (!sub[i]) goto EXPAND_FAILED; /*{{*/
6244 expand_string_message = string_sprintf(
6245 "missing '}' closing arg %d of listextract", i+1);
6246 goto EXPAND_FAILED_CURLY;
6249 /* After removal of leading and trailing white space, the first
6250 argument must be numeric and nonempty. */
6258 Uskip_whitespace(&p);
6262 while (len > 0 && isspace(p[len-1])) len--;
6265 if (!*p && !skipping)
6267 expand_string_message = US"first argument of \"listextract\" must "
6277 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6280 expand_string_message = US"first argument of \"listextract\" must "
6288 /* Extract the numbered element into $value. If
6289 skipping, just pretend the extraction failed. */
6291 lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]);
6293 /* If no string follows, $value gets substituted; otherwise there can
6294 be yes/no strings, as for lookup or if. */
6296 switch(process_yesno(
6297 skipping, /* were previously skipping */
6298 lookup_value != NULL, /* success/failure indicator */
6299 save_lookup_value, /* value to reset for string2 */
6300 &s, /* input pointer */
6301 &yield, /* output pointer */
6302 US"listextract", /* condition type */
6305 case 1: goto EXPAND_FAILED; /* when all is well, the */
6306 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6309 /* All done - restore numerical variables. */
6311 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6312 save_expand_nlength);
6314 if (skipping) continue;
6318 case EITEM_LISTQUOTE:
6321 switch(read_subs(sub, 2, 2, &s, skipping, TRUE, name, &resetok))
6323 case 1: goto EXPAND_FAILED_CURLY;
6325 case 3: goto EXPAND_FAILED;
6327 if (*sub[1]) for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6329 if (c == sep) yield = string_catn(yield, sub[1], 1);
6330 yield = string_catn(yield, sub[1], 1);
6332 else yield = string_catn(yield, US" ", 1);
6333 if (skipping) continue;
6338 case EITEM_CERTEXTRACT:
6340 uschar * save_lookup_value = lookup_value, * sub[2];
6341 int save_expand_nmax =
6342 save_expand_strings(save_expand_nstring, save_expand_nlength);
6344 /* Read the field argument */
6345 if (Uskip_whitespace(&s) != '{') /*}*/
6347 expand_string_message = US"missing '{' for field arg of certextract";
6348 goto EXPAND_FAILED_CURLY; /*}*/
6350 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6351 if (!sub[0]) goto EXPAND_FAILED; /*{{*/
6354 expand_string_message = US"missing '}' closing field arg of certextract";
6355 goto EXPAND_FAILED_CURLY;
6357 /* strip spaces fore & aft */
6362 Uskip_whitespace(&p);
6366 while (len > 0 && isspace(p[len-1])) len--;
6370 /* inspect the cert argument */
6371 if (Uskip_whitespace(&s) != '{') /*}*/
6373 expand_string_message = US"missing '{' for cert variable arg of certextract";
6374 goto EXPAND_FAILED_CURLY; /*}*/
6378 expand_string_message = US"second argument of \"certextract\" must "
6379 "be a certificate variable";
6382 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok);
6383 if (!sub[1]) goto EXPAND_FAILED; /*{{*/
6386 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6387 goto EXPAND_FAILED_CURLY;
6391 lookup_value = NULL;
6394 lookup_value = expand_getcertele(sub[0], sub[1]);
6395 if (*expand_string_message) goto EXPAND_FAILED;
6397 switch(process_yesno(
6398 skipping, /* were previously skipping */
6399 lookup_value != NULL, /* success/failure indicator */
6400 save_lookup_value, /* value to reset for string2 */
6401 &s, /* input pointer */
6402 &yield, /* output pointer */
6403 US"certextract", /* condition type */
6406 case 1: goto EXPAND_FAILED; /* when all is well, the */
6407 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6410 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6411 save_expand_nlength);
6412 if (skipping) continue;
6415 #endif /*DISABLE_TLS*/
6417 /* Handle list operations */
6423 int sep = 0, save_ptr = gstring_length(yield);
6424 uschar outsep[2] = { '\0', '\0' };
6425 const uschar *list, *expr, *temp;
6426 uschar * save_iterate_item = iterate_item;
6427 uschar * save_lookup_value = lookup_value;
6429 Uskip_whitespace(&s);
6430 if (*s++ != '{') /*}*/
6432 expand_string_message =
6433 string_sprintf("missing '{' for first arg of %s", name);
6434 goto EXPAND_FAILED_CURLY; /*}*/
6437 if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok)))
6438 goto EXPAND_FAILED; /*{{*/
6441 expand_string_message =
6442 string_sprintf("missing '}' closing first arg of %s", name);
6443 goto EXPAND_FAILED_CURLY;
6446 if (item_type == EITEM_REDUCE)
6449 Uskip_whitespace(&s);
6450 if (*s++ != '{') /*}*/
6452 expand_string_message = US"missing '{' for second arg of reduce";
6453 goto EXPAND_FAILED_CURLY; /*}*/
6455 t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6456 if (!t) goto EXPAND_FAILED;
6457 lookup_value = t; /*{{*/
6460 expand_string_message = US"missing '}' closing second arg of reduce";
6461 goto EXPAND_FAILED_CURLY;
6465 Uskip_whitespace(&s);
6466 if (*s++ != '{') /*}*/
6468 expand_string_message =
6469 string_sprintf("missing '{' for last arg of %s", name); /*}*/
6470 goto EXPAND_FAILED_CURLY;
6475 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6476 if scanning a "false" part). This allows us to find the end of the
6477 condition, because if the list is empty, we won't actually evaluate the
6478 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6479 the normal internal expansion function. */
6481 if (item_type != EITEM_FILTER)
6482 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
6484 if ((temp = eval_condition(expr, &resetok, NULL))) s = temp;
6488 expand_string_message = string_sprintf("%s inside \"%s\" item",
6489 expand_string_message, name);
6493 Uskip_whitespace(&s); /*{{{*/
6496 expand_string_message = string_sprintf("missing } at end of condition "
6497 "or expression inside \"%s\"; could be an unquoted } in the content",
6502 Uskip_whitespace(&s); /*{{*/
6505 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6510 /* If we are skipping, we can now just move on to the next item. When
6511 processing for real, we perform the iteration. */
6513 if (skipping) continue;
6514 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6516 *outsep = (uschar)sep; /* Separator as a string */
6518 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6519 name, iterate_item, lookup_value);
6521 if (item_type == EITEM_FILTER)
6524 if (!eval_condition(expr, &resetok, &condresult))
6526 iterate_item = save_iterate_item;
6527 lookup_value = save_lookup_value;
6528 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6529 expand_string_message, name);
6532 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6533 condresult? "true":"false");
6535 temp = iterate_item; /* TRUE => include this item */
6537 continue; /* FALSE => skip this item */
6540 /* EITEM_MAP and EITEM_REDUCE */
6544 uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok);
6548 iterate_item = save_iterate_item;
6549 expand_string_message = string_sprintf("%s inside \"%s\" item",
6550 expand_string_message, name);
6553 if (item_type == EITEM_REDUCE)
6555 lookup_value = t; /* Update the value of $value */
6556 continue; /* and continue the iteration */
6560 /* We reach here for FILTER if the condition is true, always for MAP,
6561 and never for REDUCE. The value in "temp" is to be added to the output
6562 list that is being created, ensuring that any occurrences of the
6563 separator character are doubled. Unless we are dealing with the first
6564 item of the output list, add in a space if the new item begins with the
6565 separator character, or is an empty string. */
6567 /*XXX is there not a standard support function for this, appending to a list? */
6568 /* yes, string_append_listele(), but it depends on lack of text before the list */
6570 if ( yield && yield->ptr != save_ptr
6571 && (temp[0] == *outsep || temp[0] == 0))
6572 yield = string_catn(yield, US" ", 1);
6574 /* Add the string in "temp" to the output list that we are building,
6575 This is done in chunks by searching for the separator character. */
6579 size_t seglen = Ustrcspn(temp, outsep);
6581 yield = string_catn(yield, temp, seglen + 1);
6583 /* If we got to the end of the string we output one character
6584 too many; backup and end the loop. Otherwise arrange to double the
6587 if (!temp[seglen]) { yield->ptr--; break; }
6588 yield = string_catn(yield, outsep, 1);
6592 /* Output a separator after the string: we will remove the redundant
6593 final one at the end. */
6595 yield = string_catn(yield, outsep, 1);
6596 } /* End of iteration over the list loop */
6598 /* REDUCE has generated no output above: output the final value of
6601 if (item_type == EITEM_REDUCE)
6603 yield = string_cat(yield, lookup_value);
6604 lookup_value = save_lookup_value; /* Restore $value */
6607 /* FILTER and MAP generate lists: if they have generated anything, remove
6608 the redundant final separator. Even though an empty item at the end of a
6609 list does not count, this is tidier. */
6611 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6613 /* Restore preserved $item */
6615 iterate_item = save_iterate_item;
6616 if (skipping) continue;
6622 int sep = 0, cond_type;
6623 const uschar * srclist, * cmp, * xtract;
6624 uschar * opname, * srcitem;
6625 const uschar * dstlist = NULL, * dstkeylist = NULL;
6626 uschar * tmp, * save_iterate_item = iterate_item;
6628 Uskip_whitespace(&s);
6629 if (*s++ != '{') /*}*/
6631 expand_string_message = US"missing '{' for list arg of sort";
6632 goto EXPAND_FAILED_CURLY; /*}*/
6635 srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6636 if (!srclist) goto EXPAND_FAILED; /*{{*/
6639 expand_string_message = US"missing '}' closing list arg of sort";
6640 goto EXPAND_FAILED_CURLY;
6643 Uskip_whitespace(&s);
6644 if (*s++ != '{') /*}*/
6646 expand_string_message = US"missing '{' for comparator arg of sort";
6647 goto EXPAND_FAILED_CURLY; /*}*/
6650 cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok);
6651 if (!cmp) goto EXPAND_FAILED; /*{{*/
6654 expand_string_message = US"missing '}' closing comparator arg of sort";
6655 goto EXPAND_FAILED_CURLY;
6658 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6660 if (!expand_string_message)
6661 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6666 case ECOND_NUM_L: case ECOND_NUM_LE:
6667 case ECOND_NUM_G: case ECOND_NUM_GE:
6668 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6669 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6673 expand_string_message = US"comparator not handled for sort";
6677 Uskip_whitespace(&s);
6678 if (*s++ != '{') /*}*/
6680 expand_string_message = US"missing '{' for extractor arg of sort";
6681 goto EXPAND_FAILED_CURLY; /*}*/
6685 if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok)))
6687 xtract = string_copyn(xtract, s - xtract);
6691 expand_string_message = US"missing '}' closing extractor arg of sort";
6692 goto EXPAND_FAILED_CURLY;
6697 expand_string_message = US"missing } at end of \"sort\"";
6701 if (skipping) continue;
6703 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6705 uschar * srcfield, * dstitem;
6706 gstring * newlist = NULL, * newkeylist = NULL;
6708 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6710 /* extract field for comparisons */
6711 iterate_item = srcitem;
6712 if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE,
6716 expand_string_message = string_sprintf(
6717 "field-extract in sort: \"%s\"", xtract);
6721 /* Insertion sort */
6723 /* copy output list until new-item < list-item */
6724 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6728 /* field for comparison */
6729 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6732 /* String-comparator names start with a letter; numeric names do not */
6734 if (sortsbefore(cond_type, isalpha(opname[0]),
6735 srcfield, dstfield))
6737 /* New-item sorts before this dst-item. Append new-item,
6738 then dst-item, then remainder of dst list. */
6740 newlist = string_append_listele(newlist, sep, srcitem);
6741 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6744 newlist = string_append_listele(newlist, sep, dstitem);
6745 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6747 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6748 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6750 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6752 newlist = string_append_listele(newlist, sep, dstitem);
6753 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6759 newlist = string_append_listele(newlist, sep, dstitem);
6760 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6763 /* If we ran out of dstlist without consuming srcitem, append it */
6766 newlist = string_append_listele(newlist, sep, srcitem);
6767 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6770 dstlist = newlist->s;
6771 dstkeylist = newkeylist->s;
6773 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6774 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6778 yield = string_cat(yield, dstlist);
6780 /* Restore preserved $item */
6781 iterate_item = save_iterate_item;
6785 expand_string_message = US"Internal error in sort (list mismatch)";
6790 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6791 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6792 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6793 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6795 #define EXPAND_DLFUNC_MAX_ARGS 8
6798 #ifndef EXPAND_DLFUNC
6799 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6800 "is not included in this binary";
6803 #else /* EXPAND_DLFUNC */
6806 exim_dlfunc_t * func;
6809 uschar * argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6811 if (expand_forbid & RDO_DLFUNC)
6813 expand_string_message =
6814 US"dynamically-loaded functions are not permitted";
6818 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
6819 TRUE, name, &resetok))
6821 case 1: goto EXPAND_FAILED_CURLY;
6823 case 3: goto EXPAND_FAILED;
6826 /* If skipping, we don't actually do anything */
6828 if (skipping) continue;
6830 /* Look up the dynamically loaded object handle in the tree. If it isn't
6831 found, dlopen() the file and put the handle in the tree for next time. */
6833 if (!(t = tree_search(dlobj_anchor, argv[0])))
6835 void * handle = dlopen(CS argv[0], RTLD_LAZY);
6838 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6839 argv[0], dlerror());
6840 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6843 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), argv[0]);
6844 Ustrcpy(t->name, argv[0]);
6845 t->data.ptr = handle;
6846 (void)tree_insertnode(&dlobj_anchor, t);
6849 /* Having obtained the dynamically loaded object handle, look up the
6850 function pointer. */
6852 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
6854 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6855 "%s", argv[1], argv[0], dlerror());
6856 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6860 /* Call the function and work out what to do with the result. If it
6861 returns OK, we have a replacement string; if it returns DEFER then
6862 expansion has failed in a non-forced manner; if it returns FAIL then
6863 failure was forced; if it returns ERROR or any other value there's a
6864 problem, so panic slightly. In any case, assume that the function has
6865 side-effects on the store that must be preserved. */
6869 for (argc = 0; argv[argc]; argc++) ;
6871 if ((status = func(&result, argc - 2, &argv[2])) != OK)
6873 expand_string_message = result ? result : US"(no message)";
6874 if (status == FAIL_FORCED)
6875 f.expand_string_forcedfail = TRUE;
6876 else if (status != FAIL)
6877 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
6878 argv[0], argv[1], status, expand_string_message);
6882 if (result) yield = string_cat(yield, result);
6885 #endif /* EXPAND_DLFUNC */
6887 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
6890 uschar *save_lookup_value = lookup_value;
6892 if (Uskip_whitespace(&s) != '{') /*}*/
6895 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6896 if (!key) goto EXPAND_FAILED; /*{{*/
6899 expand_string_message = US"missing '}' for name arg of env";
6900 goto EXPAND_FAILED_CURLY;
6903 lookup_value = US getenv(CS key);
6905 switch(process_yesno(
6906 skipping, /* were previously skipping */
6907 lookup_value != NULL, /* success/failure indicator */
6908 save_lookup_value, /* value to reset for string2 */
6909 &s, /* input pointer */
6910 &yield, /* output pointer */
6911 US"env", /* condition type */
6914 case 1: goto EXPAND_FAILED; /* when all is well, the */
6915 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6917 if (skipping) continue;
6922 case EITEM_SRS_ENCODE:
6923 /* ${srs_encode {secret} {return_path} {orig_domain}} */
6928 BOOL quoted = FALSE;
6930 switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok))
6932 case 1: goto EXPAND_FAILED_CURLY;
6934 case 3: goto EXPAND_FAILED;
6937 g = string_catn(g, US"SRS0=", 5);
6939 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
6940 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
6941 g = string_catn(g, cksum, sizeof(cksum));
6942 g = string_catn(g, US"=", 1);
6944 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
6950 gettimeofday(&now, NULL);
6951 for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5)
6952 h = string_catn(h, &base32_chars[i & 0x1f], 1);
6953 if (h) while (h->ptr > 0)
6954 g = string_catn(g, &h->s[--h->ptr], 1);
6956 g = string_catn(g, US"=", 1);
6958 /* ${domain:$return_path}=${local_part:$return_path} */
6960 int start, end, domain;
6961 uschar * t = parse_extract_address(sub[1], &expand_string_message,
6962 &start, &end, &domain, FALSE);
6968 if (domain > 0) g = string_cat(g, t + domain);
6969 g = string_catn(g, US"=", 1);
6971 s = domain > 0 ? string_copyn(t, domain - 1) : t;
6972 if ((quoted = Ustrchr(s, '"') != NULL))
6975 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
6976 while (*s) /* de-quote */
6978 while (*s && *s != '"') h = string_catn(h, s++, 1);
6980 while (*s && *s != '"') h = string_catn(h, s++, 1);
6983 gstring_release_unused(h);
6984 s = string_from_gstring(h);
6986 g = string_cat(g, s);
6989 /* Assume that if the original local_part had quotes
6990 it was for good reason */
6992 if (quoted) yield = string_catn(yield, US"\"", 1);
6993 yield = string_catn(yield, g->s, g->ptr);
6994 if (quoted) yield = string_catn(yield, US"\"", 1);
6996 /* @$original_domain */
6997 yield = string_catn(yield, US"@", 1);
6998 yield = string_cat(yield, sub[2]);
7000 if (skipping) continue;
7003 #endif /*SUPPORT_SRS*/
7007 } /* EITEM_* switch */
7011 if (yield && (start > 0 || *s)) /* only if not the sole expansion of the line */
7012 debug_expansion_interim(US"item-res",
7013 yield->s + start, yield->ptr - start, skipping);
7019 /* Control reaches here if the name is not recognized as one of the more
7020 complicated expansion items. Check for the "operator" syntax (name terminated
7021 by a colon). Some of the operators have arguments, separated by _ from the
7027 uschar * arg = NULL, * sub;
7029 var_entry * vp = NULL;
7032 /* Owing to an historical mis-design, an underscore may be part of the
7033 operator name, or it may introduce arguments. We therefore first scan the
7034 table of names that contain underscores. If there is no match, we cut off
7035 the arguments and then scan the main table. */
7037 if ((c = chop_match(name, op_table_underscore,
7038 nelem(op_table_underscore))) < 0)
7040 if ((arg = Ustrchr(name, '_')))
7042 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
7043 c += nelem(op_table_underscore);
7044 if (arg) *arg++ = '_'; /* Put back for error messages */
7047 /* Deal specially with operators that might take a certificate variable
7048 as we do not want to do the usual expansion. For most, expand the string.*/
7058 const uschar * s1 = s;
7059 sub = expand_string_internal(s+2, TRUE, &s1, skipping,
7061 if (!sub) goto EXPAND_FAILED; /*{*/
7064 expand_string_message =
7065 string_sprintf("missing '}' closing cert arg of %s", name);
7066 goto EXPAND_FAILED_CURLY;
7068 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
7078 sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
7079 if (!sub) goto EXPAND_FAILED;
7084 /* If we are skipping, we don't need to perform the operation at all.
7085 This matters for operations like "mask", because the data may not be
7086 in the correct format when skipping. For example, the expression may test
7087 for the existence of $sender_host_address before trying to mask it. For
7088 other operations, doing them may not fail, but it is a waste of time. */
7090 if (skipping && c >= 0) continue;
7092 /* Otherwise, switch on the operator type. After handling go back
7093 to the main loop top. */
7096 int start = yield->ptr;
7102 unsigned long int n = Ustrtoul(sub, &t, 10);
7107 expand_string_message = string_sprintf("argument for base32 "
7108 "operator is \"%s\", which is not a decimal number", sub);
7112 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7114 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7121 unsigned long int n = 0;
7124 uschar * t = Ustrchr(base32_chars, *tt++);
7127 expand_string_message = string_sprintf("argument for base32d "
7128 "operator is \"%s\", which is not a base 32 number", sub);
7131 n = n * 32 + (t - base32_chars);
7133 yield = string_fmt_append(yield, "%ld", n);
7140 unsigned long int n = Ustrtoul(sub, &t, 10);
7143 expand_string_message = string_sprintf("argument for base62 "
7144 "operator is \"%s\", which is not a decimal number", sub);
7147 yield = string_cat(yield, string_base62(n));
7151 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7156 unsigned long int n = 0;
7159 uschar *t = Ustrchr(base62_chars, *tt++);
7162 expand_string_message = string_sprintf("argument for base62d "
7163 "operator is \"%s\", which is not a base %d number", sub,
7167 n = n * BASE_62 + (t - base62_chars);
7169 yield = string_fmt_append(yield, "%ld", n);
7175 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok);
7178 expand_string_message =
7179 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7180 expand_string_message);
7183 yield = string_cat(yield, expanded);
7190 uschar *t = sub - 1;
7191 while (*(++t) != 0) { *t = tolower(*t); count++; }
7192 yield = string_catn(yield, sub, count);
7199 uschar *t = sub - 1;
7200 while (*(++t) != 0) { *t = toupper(*t); count++; }
7201 yield = string_catn(yield, sub, count);
7207 if (vp && *(void **)vp->value)
7209 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7210 yield = string_cat(yield, cp);
7218 md5_end(&base, sub, Ustrlen(sub), digest);
7219 for (int j = 0; j < 16; j++)
7220 yield = string_fmt_append(yield, "%02x", digest[j]);
7226 if (vp && *(void **)vp->value)
7228 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7229 yield = string_cat(yield, cp);
7237 sha1_end(&h, sub, Ustrlen(sub), digest);
7238 for (int j = 0; j < 20; j++)
7239 yield = string_fmt_append(yield, "%02X", digest[j]);
7245 #ifdef EXIM_HAVE_SHA2
7246 if (vp && *(void **)vp->value)
7247 if (c == EOP_SHA256)
7248 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7250 expand_string_message = US"sha2_N not supported with certificates";
7255 hashmethod m = !arg ? HASH_SHA2_256
7256 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7257 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7258 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7261 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7263 expand_string_message = US"unrecognised sha2 variant";
7267 exim_sha_update_string(&h, sub);
7268 exim_sha_finish(&h, &b);
7270 yield = string_fmt_append(yield, "%02X", *b.data++);
7273 expand_string_message = US"sha256 only supported with TLS";
7278 #ifdef EXIM_HAVE_SHA3
7282 hashmethod m = !arg ? HASH_SHA3_256
7283 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7284 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7285 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7286 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7289 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7291 expand_string_message = US"unrecognised sha3 variant";
7295 exim_sha_update_string(&h, sub);
7296 exim_sha_finish(&h, &b);
7298 yield = string_fmt_append(yield, "%02X", *b.data++);
7302 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7306 /* Convert hex encoding to base64 encoding */
7316 for (enc = sub; *enc; enc++)
7318 if (!isxdigit(*enc))
7320 expand_string_message = string_sprintf("\"%s\" is not a hex "
7329 expand_string_message = string_sprintf("\"%s\" contains an odd "
7330 "number of characters", sub);
7334 while ((c = *in++) != 0)
7336 if (isdigit(c)) c -= '0';
7337 else c = toupper(c) - 'A' + 10;
7347 enc = b64encode(CUS sub, out - sub);
7348 yield = string_cat(yield, enc);
7352 /* Convert octets outside 0x21..0x7E to \xXX form */
7356 uschar *t = sub - 1;
7359 if (*t < 0x21 || 0x7E < *t)
7360 yield = string_fmt_append(yield, "\\x%02x", *t);
7362 yield = string_catn(yield, t, 1);
7367 /* count the number of list elements */
7371 int cnt = 0, sep = 0;
7372 uschar * buf = store_get(2, sub);
7374 while (string_nextinlist(CUSS &sub, &sep, buf, 1)) cnt++;
7375 yield = string_fmt_append(yield, "%d", cnt);
7379 /* expand a named list given the name */
7380 /* handles nested named lists; requotes as colon-sep list */
7383 expand_string_message = NULL;
7384 yield = expand_listnamed(yield, sub, arg);
7385 if (expand_string_message)
7389 /* quote a list-item for the given list-separator */
7391 /* mask applies a mask to an IP address; for example the result of
7392 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7399 int type, mask, maskoffset;
7403 if ((type = string_is_ip_address(sub, &maskoffset)) == 0)
7405 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7410 if (maskoffset == 0)
7412 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7417 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7419 if (*endptr || mask < 0 || mask > (type == 4 ? 32 : 128))
7421 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7426 /* If an optional 'n' was given, ipv6 gets normalised output:
7427 colons rather than dots, and zero-compressed. */
7429 normalised = arg && *arg == 'n';
7431 /* Convert the address to binary integer(s) and apply the mask */
7433 sub[maskoffset] = 0;
7434 count = host_aton(sub, binary);
7435 host_mask(count, binary, mask);
7437 /* Convert to masked textual format and add to output. */
7439 if (type == 4 || !normalised)
7440 yield = string_catn(yield, buffer,
7441 host_nmtoa(count, binary, mask, buffer, '.'));
7444 ipv6_nmtoa(binary, buffer);
7445 yield = string_fmt_append(yield, "%s/%d", buffer, mask);
7451 case EOP_IPV6DENORM:
7453 int type = string_is_ip_address(sub, NULL);
7460 (void) host_aton(sub, binary);
7463 case 4: /* convert to IPv4-mapped IPv6 */
7464 binary[0] = binary[1] = 0;
7465 binary[2] = 0x0000ffff;
7466 (void) host_aton(sub, binary+3);
7470 expand_string_message =
7471 string_sprintf("\"%s\" is not an IP address", sub);
7475 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7476 ? ipv6_nmtoa(binary, buffer)
7477 : host_nmtoa(4, binary, -1, buffer, ':')
7483 case EOP_LOCAL_PART:
7487 int start, end, domain;
7488 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7491 if (c != EOP_DOMAIN)
7492 yield = c == EOP_LOCAL_PART && domain > 0
7493 ? string_catn(yield, t, domain - 1)
7494 : string_cat(yield, t);
7495 else if (domain > 0)
7496 yield = string_cat(yield, t + domain);
7502 uschar outsep[2] = { ':', '\0' };
7503 uschar *address, *error;
7504 int save_ptr = gstring_length(yield);
7505 int start, end, domain; /* Not really used */
7507 if (Uskip_whitespace(&sub) == '>')
7508 if (*outsep = *++sub) ++sub;
7511 expand_string_message = string_sprintf("output separator "
7512 "missing in expanding ${addresses:%s}", --sub);
7515 f.parse_allow_group = TRUE;
7519 uschar * p = parse_find_address_end(sub, FALSE);
7520 uschar saveend = *p;
7522 address = parse_extract_address(sub, &error, &start, &end, &domain,
7526 /* Add the address to the output list that we are building. This is
7527 done in chunks by searching for the separator character. At the
7528 start, unless we are dealing with the first address of the output
7529 list, add in a space if the new address begins with the separator
7530 character, or is an empty string. */
7534 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7535 yield = string_catn(yield, US" ", 1);
7539 size_t seglen = Ustrcspn(address, outsep);
7540 yield = string_catn(yield, address, seglen + 1);
7542 /* If we got to the end of the string we output one character
7545 if (address[seglen] == '\0') { yield->ptr--; break; }
7546 yield = string_catn(yield, outsep, 1);
7547 address += seglen + 1;
7550 /* Output a separator after the string: we will remove the
7551 redundant final one at the end. */
7553 yield = string_catn(yield, outsep, 1);
7556 if (saveend == '\0') break;
7560 /* If we have generated anything, remove the redundant final
7563 if (yield && yield->ptr != save_ptr) yield->ptr--;
7564 f.parse_allow_group = FALSE;
7569 /* quote puts a string in quotes if it is empty or contains anything
7570 other than alphamerics, underscore, dot, or hyphen.
7572 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7573 be quoted in order to be a valid local part.
7575 In both cases, newlines and carriage returns are converted into \n and \r
7579 case EOP_QUOTE_LOCAL_PART:
7582 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7583 uschar *t = sub - 1;
7586 while (!needs_quote && *++t)
7587 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7589 else /* EOP_QUOTE_LOCAL_PART */
7590 while (!needs_quote && *++t)
7591 needs_quote = !isalnum(*t)
7592 && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL
7593 && (*t != '.' || t == sub || !t[1]);
7597 yield = string_catn(yield, US"\"", 1);
7601 yield = string_catn(yield, US"\\n", 2);
7602 else if (*t == '\r')
7603 yield = string_catn(yield, US"\\r", 2);
7606 if (*t == '\\' || *t == '"')
7607 yield = string_catn(yield, US"\\", 1);
7608 yield = string_catn(yield, t, 1);
7610 yield = string_catn(yield, US"\"", 1);
7613 yield = string_cat(yield, sub);
7617 /* quote_lookuptype does lookup-specific quoting */
7622 uschar * opt = Ustrchr(arg, '_');
7624 if (opt) *opt++ = 0;
7626 if ((n = search_findtype(arg, Ustrlen(arg))) < 0)
7628 expand_string_message = search_error_message;
7632 if (lookup_list[n]->quote)
7633 sub = (lookup_list[n]->quote)(sub, opt, (unsigned)n);
7639 expand_string_message = string_sprintf(
7640 "\"%s\" unrecognized after \"${quote_%s\"", /*}*/
7645 yield = string_cat(yield, sub);
7649 /* rx quote sticks in \ before any non-alphameric character so that
7650 the insertion works in a regular expression. */
7654 uschar *t = sub - 1;
7658 yield = string_catn(yield, US"\\", 1);
7659 yield = string_catn(yield, t, 1);
7664 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7665 prescribed by the RFC, if there are characters that need to be encoded */
7668 yield = string_cat(yield,
7669 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7673 /* RFC 2047 decode */
7679 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7680 headers_charset, '?', &len, &error);
7683 expand_string_message = error;
7686 yield = string_catn(yield, decoded, len);
7690 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7695 uschar * buff = store_get(4, sub);
7700 if (c > 255) c = '_';
7702 yield = string_catn(yield, buff, 1);
7707 /* replace illegal UTF-8 sequences by replacement character */
7709 #define UTF8_REPLACEMENT_CHAR US"?"
7713 int seq_len = 0, index = 0;
7715 long codepoint = -1;
7717 uschar seq_buff[4]; /* accumulate utf-8 here */
7719 /* Manually track tainting, as we deal in individual chars below */
7721 if (!yield->s || !yield->ptr)
7722 yield->s = store_get(yield->size = Ustrlen(sub), sub);
7723 else if (is_incompatible(yield->s, sub))
7724 gstring_rebuffer(yield, sub);
7726 /* Check the UTF-8, byte-by-byte */
7735 if ((c & 0xc0) != 0x80)
7736 /* wrong continuation byte; invalidate all bytes */
7737 complete = 1; /* error */
7740 codepoint = (codepoint << 6) | (c & 0x3f);
7741 seq_buff[index++] = c;
7742 if (--bytes_left == 0) /* codepoint complete */
7743 if(codepoint > 0x10FFFF) /* is it too large? */
7744 complete = -1; /* error (RFC3629 limit) */
7746 { /* finished; output utf-8 sequence */
7747 yield = string_catn(yield, seq_buff, seq_len);
7752 else /* no bytes left: new sequence */
7754 if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7756 yield = string_catn(yield, &c, 1);
7759 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
7761 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7766 codepoint = c & 0x1f;
7769 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
7772 codepoint = c & 0x0f;
7774 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
7777 codepoint = c & 0x07;
7779 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7782 seq_buff[index++] = c;
7783 seq_len = bytes_left + 1;
7784 } /* if(bytes_left) */
7788 bytes_left = index = 0;
7789 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7791 if ((complete == 1) && ((c & 0x80) == 0))
7792 /* ASCII character follows incomplete sequence */
7793 yield = string_catn(yield, &c, 1);
7795 /* If given a sequence truncated mid-character, we also want to report ?
7796 Eg, ${length_1:フィル} is one byte, not one character, so we expect
7797 ${utf8clean:${length_1:フィル}} to yield '?' */
7799 if (bytes_left != 0)
7800 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7806 case EOP_UTF8_DOMAIN_TO_ALABEL:
7808 uschar * error = NULL;
7809 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7812 expand_string_message = string_sprintf(
7813 "error converting utf8 (%s) to alabel: %s",
7814 string_printing(sub), error);
7817 yield = string_cat(yield, s);
7821 case EOP_UTF8_DOMAIN_FROM_ALABEL:
7823 uschar * error = NULL;
7824 uschar * s = string_domain_alabel_to_utf8(sub, &error);
7827 expand_string_message = string_sprintf(
7828 "error converting alabel (%s) to utf8: %s",
7829 string_printing(sub), error);
7832 yield = string_cat(yield, s);
7836 case EOP_UTF8_LOCALPART_TO_ALABEL:
7838 uschar * error = NULL;
7839 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
7842 expand_string_message = string_sprintf(
7843 "error converting utf8 (%s) to alabel: %s",
7844 string_printing(sub), error);
7847 yield = string_cat(yield, s);
7848 DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s);
7852 case EOP_UTF8_LOCALPART_FROM_ALABEL:
7854 uschar * error = NULL;
7855 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
7858 expand_string_message = string_sprintf(
7859 "error converting alabel (%s) to utf8: %s",
7860 string_printing(sub), error);
7863 yield = string_cat(yield, s);
7866 #endif /* EXPERIMENTAL_INTERNATIONAL */
7868 /* escape turns all non-printing characters into escape sequences. */
7872 const uschar * t = string_printing(sub);
7873 yield = string_cat(yield, t);
7877 case EOP_ESCAPE8BIT:
7881 for (const uschar * s = sub; (c = *s); s++)
7882 yield = c < 127 && c != '\\'
7883 ? string_catn(yield, s, 1)
7884 : string_fmt_append(yield, "\\%03o", c);
7888 /* Handle numeric expression evaluation */
7893 uschar *save_sub = sub;
7894 uschar *error = NULL;
7895 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
7898 expand_string_message = string_sprintf("error in expression "
7899 "evaluation: %s (after processing \"%.*s\")", error,
7900 (int)(sub-save_sub), save_sub);
7903 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
7907 /* Handle time period formatting */
7911 int n = readconf_readtime(sub, 0, FALSE);
7914 expand_string_message = string_sprintf("string \"%s\" is not an "
7915 "Exim time interval in \"%s\" operator", sub, name);
7918 yield = string_fmt_append(yield, "%d", n);
7922 case EOP_TIME_INTERVAL:
7925 uschar *t = read_number(&n, sub);
7926 if (*t != 0) /* Not A Number*/
7928 expand_string_message = string_sprintf("string \"%s\" is not a "
7929 "positive number in \"%s\" operator", sub, name);
7932 t = readconf_printtime(n);
7933 yield = string_cat(yield, t);
7937 /* Convert string to base64 encoding */
7943 uschar * s = vp && *(void **)vp->value
7944 ? tls_cert_der_b64(*(void **)vp->value)
7945 : b64encode(CUS sub, Ustrlen(sub));
7947 uschar * s = b64encode(CUS sub, Ustrlen(sub));
7949 yield = string_cat(yield, s);
7956 int len = b64decode(sub, &s);
7959 expand_string_message = string_sprintf("string \"%s\" is not "
7960 "well-formed for \"%s\" operator", sub, name);
7963 yield = string_cat(yield, s);
7967 /* strlen returns the length of the string */
7970 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
7973 /* length_n or l_n takes just the first n characters or the whole string,
7974 whichever is the shorter;
7976 substr_m_n, and s_m_n take n characters from offset m; negative m take
7977 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
7978 takes the rest, either to the right or to the left.
7980 hash_n or h_n makes a hash of length n from the string, yielding n
7981 characters from the set a-z; hash_n_m makes a hash of length n, but
7982 uses m characters from the set a-zA-Z0-9.
7984 nhash_n returns a single number between 0 and n-1 (in text form), while
7985 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
7986 between 0 and n-1 and the second between 0 and m-1. */
8006 expand_string_message = string_sprintf("missing values after %s",
8011 /* "length" has only one argument, effectively being synonymous with
8014 if (c == EOP_LENGTH || c == EOP_L)
8020 /* The others have one or two arguments; for "substr" the first may be
8021 negative. The second being negative means "not supplied". */
8026 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
8029 /* Read up to two numbers, separated by underscores */
8034 if (arg != ret && *arg == '_' && pn == &value1)
8038 if (arg[1] != 0) arg++;
8040 else if (!isdigit(*arg))
8042 expand_string_message =
8043 string_sprintf("non-digit after underscore in \"%s\"", name);
8046 else *pn = (*pn)*10 + *arg++ - '0';
8050 /* Perform the required operation */
8052 ret = c == EOP_HASH || c == EOP_H
8053 ? compute_hash(sub, value1, value2, &len)
8054 : c == EOP_NHASH || c == EOP_NH
8055 ? compute_nhash(sub, value1, value2, &len)
8056 : extract_substr(sub, value1, value2, &len);
8057 if (!ret) goto EXPAND_FAILED;
8059 yield = string_catn(yield, ret, len);
8068 uschar **modetable[3];
8072 if (expand_forbid & RDO_EXISTS)
8074 expand_string_message = US"Use of the stat() expansion is not permitted";
8078 if (stat(CS sub, &st) < 0)
8080 expand_string_message = string_sprintf("stat(%s) failed: %s",
8081 sub, strerror(errno));
8085 switch (mode & S_IFMT)
8087 case S_IFIFO: smode[0] = 'p'; break;
8088 case S_IFCHR: smode[0] = 'c'; break;
8089 case S_IFDIR: smode[0] = 'd'; break;
8090 case S_IFBLK: smode[0] = 'b'; break;
8091 case S_IFREG: smode[0] = '-'; break;
8092 default: smode[0] = '?'; break;
8095 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8096 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8097 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8099 for (int i = 0; i < 3; i++)
8101 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8106 yield = string_fmt_append(yield,
8107 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8108 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8109 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8110 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8111 (long)st.st_gid, st.st_size, (long)st.st_atime,
8112 (long)st.st_mtime, (long)st.st_ctime);
8116 /* vaguely random number less than N */
8120 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8122 if (expand_string_message)
8124 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8128 /* Reverse IP, including IPv6 to dotted-nibble */
8130 case EOP_REVERSE_IP:
8132 int family, maskptr;
8133 uschar reversed[128];
8135 family = string_is_ip_address(sub, &maskptr);
8138 expand_string_message = string_sprintf(
8139 "reverse_ip() not given an IP address [%s]", sub);
8142 invert_address(reversed, sub);
8143 yield = string_cat(yield, reversed);
8147 /* Unknown operator */
8150 expand_string_message =
8151 string_sprintf("unknown expansion operator \"%s\"", name);
8153 } /* EOP_* switch */
8157 const uschar * s = yield->s + start;
8158 int i = yield->ptr - start;
8159 BOOL tainted = is_tainted(s);
8163 debug_printf_indent("|-----op-res: %.*s\n", i, s);
8166 debug_printf_indent("%s \\__", skipping ? "| " : " ");
8167 debug_print_taint(yield->s);
8172 debug_printf_indent(UTF8_VERT_RIGHT
8173 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8174 "op-res: %.*s\n", i, s);
8177 debug_printf_indent("%s",
8179 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8180 debug_print_taint(yield->s);
8188 /* Not an item or an operator */
8189 /* Handle a plain name. If this is the first thing in the expansion, release
8190 the pre-allocated buffer. If the result data is known to be in a new buffer,
8191 newsize will be set to the size of that buffer, and we can just point at that
8192 store instead of copying. Many expansion strings contain just one reference,
8193 so this is a useful optimization, especially for humungous headers
8194 ($message_headers). */
8198 const uschar * value;
8204 g = store_get(sizeof(gstring), GET_UNTAINTED);
8205 else if (yield->ptr == 0)
8207 if (resetok) reset_point = store_reset(reset_point);
8209 reset_point = store_mark();
8210 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
8212 if (!(value = find_variable(name, FALSE, skipping, &newsize)))
8214 expand_string_message =
8215 string_sprintf("unknown variable in \"${%s}\"", name);
8216 check_variable_error_message(name);
8219 len = Ustrlen(value);
8220 if (!yield && newsize)
8223 yield->size = newsize;
8225 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
8228 yield = string_catn(yield, value, len);
8232 /* Else there's something wrong */
8234 expand_string_message =
8235 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8236 "in a variable reference)", name);
8240 /* If we hit the end of the string when ket_ends is set, there is a missing
8241 terminating brace. */
8243 if (ket_ends && !*s)
8245 expand_string_message = malformed_header
8246 ? US"missing } at end of string - could be header name not terminated by colon"
8247 : US"missing } at end of string";
8251 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8252 added to the string. If so, set up an empty string. Add a terminating zero. If
8253 left != NULL, return a pointer to the terminator. */
8256 yield = string_get(1);
8257 (void) string_from_gstring(yield);
8258 if (left) *left = s;
8260 /* Any stacking store that was used above the final string is no longer needed.
8261 In many cases the final string will be the first one that was got and so there
8262 will be optimal store usage. */
8264 if (resetok) gstring_release_unused(yield);
8265 else if (resetok_p) *resetok_p = FALSE;
8269 BOOL tainted = is_tainted(yield->s);
8272 debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string);
8273 debug_printf_indent("%sresult: %s\n",
8274 skipping ? "|-----" : "\\_____", yield->s);
8277 debug_printf_indent("%s \\__", skipping ? "| " : " ");
8278 debug_print_taint(yield->s);
8281 debug_printf_indent("\\___skipping: result is not used\n");
8285 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
8286 "expanding: %.*s\n",
8287 (int)(s - string), string);
8288 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8290 skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8294 debug_printf_indent("%s",
8296 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8297 debug_print_taint(yield->s);
8300 debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8301 "skipping: result is not used\n");
8307 /* This is the failure exit: easiest to program with a goto. We still need
8308 to update the pointer to the terminator, for cases of nested calls with "fail".
8311 EXPAND_FAILED_CURLY:
8312 if (malformed_header)
8313 expand_string_message =
8314 US"missing or misplaced { or } - could be header name not terminated by colon";
8316 else if (!expand_string_message || !*expand_string_message)
8317 expand_string_message = US"missing or misplaced { or }";
8319 /* At one point, Exim reset the store to yield (if yield was not NULL), but
8320 that is a bad idea, because expand_string_message is in dynamic store. */
8323 if (left) *left = s;
8328 debug_printf_indent("|failed to expand: %s\n", string);
8329 debug_printf_indent("%serror message: %s\n",
8330 f.expand_string_forcedfail ? "|---" : "\\___", expand_string_message);
8331 if (f.expand_string_forcedfail)
8332 debug_printf_indent("\\failure was forced\n");
8336 debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n",
8338 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8339 "error message: %s\n",
8340 f.expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8341 expand_string_message);
8342 if (f.expand_string_forcedfail)
8343 debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n");
8346 if (resetok_p && !resetok) *resetok_p = FALSE;
8352 /* This is the external function call. Do a quick check for any expansion
8353 metacharacters, and if there are none, just return the input string.
8355 Argument: the string to be expanded
8356 Returns: the expanded string, or NULL if expansion failed; if failure was
8357 due to a lookup deferring, search_find_defer will be TRUE
8361 expand_cstring(const uschar * string)
8363 if (Ustrpbrk(string, "$\\") != NULL)
8365 int old_pool = store_pool;
8368 f.search_find_defer = FALSE;
8369 malformed_header = FALSE;
8370 store_pool = POOL_MAIN;
8371 s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL);
8372 store_pool = old_pool;
8380 expand_string(uschar * string)
8382 return US expand_cstring(CUS string);
8389 /*************************************************
8391 *************************************************/
8393 /* Now and again we want to expand a string and be sure that the result is in a
8394 new bit of store. This function does that.
8395 Since we know it has been copied, the de-const cast is safe.
8397 Argument: the string to be expanded
8398 Returns: the expanded string, always in a new bit of store, or NULL
8402 expand_string_copy(const uschar *string)
8404 const uschar *yield = expand_cstring(string);
8405 if (yield == string) yield = string_copy(string);
8411 /*************************************************
8412 * Expand and interpret as an integer *
8413 *************************************************/
8415 /* Expand a string, and convert the result into an integer.
8418 string the string to be expanded
8419 isplus TRUE if a non-negative number is expected
8421 Returns: the integer value, or
8422 -1 for an expansion error ) in both cases, message in
8423 -2 for an integer interpretation error ) expand_string_message
8424 expand_string_message is set NULL for an OK integer
8428 expand_string_integer(uschar *string, BOOL isplus)
8430 return expanded_string_integer(expand_string(string), isplus);
8434 /*************************************************
8435 * Interpret string as an integer *
8436 *************************************************/
8438 /* Convert a string (that has already been expanded) into an integer.
8440 This function is used inside the expansion code.
8443 s the string to be expanded
8444 isplus TRUE if a non-negative number is expected
8446 Returns: the integer value, or
8447 -1 if string is NULL (which implies an expansion error)
8448 -2 for an integer interpretation error
8449 expand_string_message is set NULL for an OK integer
8452 static int_eximarith_t
8453 expanded_string_integer(const uschar *s, BOOL isplus)
8455 int_eximarith_t value;
8456 uschar *msg = US"invalid integer \"%s\"";
8459 /* If expansion failed, expand_string_message will be set. */
8463 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8464 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8465 systems, so we set it zero ourselves. */
8468 expand_string_message = NULL; /* Indicates no error */
8470 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8471 equal to 0. Unfortunately, people actually relied upon that, so preserve
8472 the behaviour explicitly. Stripping leading whitespace is a harmless
8473 noop change since strtol skips it anyway (provided that there is a number
8476 if (Uskip_whitespace(&s) == '\0')
8479 debug_printf_indent("treating blank string as number 0\n");
8483 value = strtoll(CS s, CSS &endptr, 10);
8486 msg = US"integer expected but \"%s\" found";
8487 else if (value < 0 && isplus)
8488 msg = US"non-negative integer expected but \"%s\" found";
8491 switch (tolower(*endptr))
8496 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8501 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8502 else value *= 1024*1024;
8506 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8507 else value *= 1024*1024*1024;
8511 if (errno == ERANGE)
8512 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8514 if (Uskip_whitespace(&endptr) == 0) return value;
8517 expand_string_message = string_sprintf(CS msg, s);
8522 /* These values are usually fixed boolean values, but they are permitted to be
8526 addr address being routed
8527 mtype the module type
8528 mname the module name
8529 dbg_opt debug selectors
8530 oname the option name
8531 bvalue the router's boolean value
8532 svalue the router's string value
8533 rvalue where to put the returned value
8535 Returns: OK value placed in rvalue
8536 DEFER expansion failed
8540 exp_bool(address_item *addr,
8541 uschar *mtype, uschar *mname, unsigned dbg_opt,
8542 uschar *oname, BOOL bvalue,
8543 uschar *svalue, BOOL *rvalue)
8546 if (!svalue) { *rvalue = bvalue; return OK; }
8548 if (!(expanded = expand_string(svalue)))
8550 if (f.expand_string_forcedfail)
8552 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8556 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8557 oname, mname, mtype, expand_string_message);
8558 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8562 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8565 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8567 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8571 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8572 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8581 /* Avoid potentially exposing a password in a string about to be logged */
8584 expand_hide_passwords(uschar * s)
8586 return ( ( Ustrstr(s, "failed to expand") != NULL
8587 || Ustrstr(s, "expansion of ") != NULL
8589 && ( Ustrstr(s, "mysql") != NULL
8590 || Ustrstr(s, "pgsql") != NULL
8591 || Ustrstr(s, "redis") != NULL
8592 || Ustrstr(s, "sqlite") != NULL
8593 || Ustrstr(s, "ldap:") != NULL
8594 || Ustrstr(s, "ldaps:") != NULL
8595 || Ustrstr(s, "ldapi:") != NULL
8596 || Ustrstr(s, "ldapdn:") != NULL
8597 || Ustrstr(s, "ldapm:") != NULL
8599 ? US"Temporary internal error" : s;
8603 /* Read given named file into big_buffer. Use for keying material etc.
8604 The content will have an ascii NUL appended.
8609 Return: pointer to buffer, or NULL on error.
8613 expand_file_big_buffer(const uschar * filename)
8615 int fd, off = 0, len;
8617 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8619 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8626 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8629 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8637 big_buffer[off] = '\0';
8643 /*************************************************
8644 * Error-checking for testsuite *
8645 *************************************************/
8647 uschar * region_start;
8648 uschar * region_end;
8649 const uschar *var_name;
8650 const uschar *var_data;
8653 /* Called via tree_walk, which allows nonconst name/data. Our usage is const. */
8655 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8658 if (var_data >= e->region_start && var_data < e->region_end)
8660 e->var_name = CUS var_name;
8661 e->var_data = CUS var_data;
8666 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8668 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8669 .var_name = NULL, .var_data = NULL };
8671 /* check acl_ variables */
8672 tree_walk(acl_var_c, assert_variable_notin, &e);
8673 tree_walk(acl_var_m, assert_variable_notin, &e);
8675 /* check auth<n> variables.
8676 assert_variable_notin() treats as const, so deconst is safe. */
8677 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8678 assert_variable_notin(US"auth<n>", US auth_vars[i], &e);
8680 /* check regex<n> variables. assert_variable_notin() treats as const. */
8681 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8682 assert_variable_notin(US"regex<n>", US regex_vars[i], &e);
8684 /* check known-name variables */
8685 for (var_entry * v = var_table; v < var_table + var_table_size; v++)
8686 if (v->type == vtype_stringptr)
8687 assert_variable_notin(US v->name, *(USS v->value), &e);
8689 /* check dns and address trees */
8690 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8691 tree_walk(tree_duplicates, assert_variable_notin, &e);
8692 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8693 tree_walk(tree_unusable, assert_variable_notin, &e);
8696 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8697 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8698 e.var_name, filename, linenumber, e.var_data);
8703 /*************************************************
8704 **************************************************
8705 * Stand-alone test program *
8706 **************************************************
8707 *************************************************/
8713 regex_match_and_setup(const pcre2_code *re, uschar *subject, int options, int setup)
8715 int ovec[3*(EXPAND_MAXN+1)];
8716 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8718 BOOL yield = n >= 0;
8719 if (n == 0) n = EXPAND_MAXN + 1;
8722 expand_nmax = setup < 0 ? 0 : setup + 1;
8723 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8725 expand_nstring[expand_nmax] = subject + ovec[nn];
8726 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
8734 int main(int argc, uschar **argv)
8736 uschar buffer[1024];
8738 debug_selector = D_v;
8739 debug_file = stderr;
8740 debug_fd = fileno(debug_file);
8741 big_buffer = malloc(big_buffer_size);
8744 for (int i = 1; i < argc; i++)
8746 if (argv[i][0] == '+')
8748 debug_trace_memory = 2;
8751 if (isdigit(argv[i][0]))
8752 debug_selector = Ustrtol(argv[i], NULL, 0);
8754 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8758 eldap_default_servers = argv[i];
8761 mysql_servers = argv[i];
8764 pgsql_servers = argv[i];
8767 redis_servers = argv[i];
8771 else opt_perl_startup = argv[i];
8775 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8777 expand_nstring[1] = US"string 1....";
8778 expand_nlength[1] = 8;
8782 if (opt_perl_startup != NULL)
8785 printf("Starting Perl interpreter\n");
8786 errstr = init_perl(opt_perl_startup);
8789 printf("** error in perl_startup code: %s\n", errstr);
8790 return EXIT_FAILURE;
8793 #endif /* EXIM_PERL */
8795 /* Thie deliberately regards the input as untainted, so that it can be
8796 expanded; only reasonable since this is a test for string-expansions. */
8798 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8800 rmark reset_point = store_mark();
8801 uschar *yield = expand_string(buffer);
8803 printf("%s\n", yield);
8806 if (f.search_find_defer) printf("search_find deferred\n");
8807 printf("Failed: %s\n", expand_string_message);
8808 if (f.expand_string_forcedfail) printf("Forced failure\n");
8811 store_reset(reset_point);
8823 /* End of expand.c */