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 *, 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;
1753 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1755 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1759 len = daemon_client_sockname(&sa_un, &sname);
1761 if (bind(fd, (const struct sockaddr *)&sa_un, (socklen_t)len) < 0)
1762 { where = US"bind"; goto bad; }
1765 debug_printf("local addr '%s%s'\n",
1766 *sa_un.sun_path ? "" : "@",
1767 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1770 len = daemon_notifier_sockname(&sa_un);
1771 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1772 { where = US"connect"; goto bad2; }
1774 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1775 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1777 if (poll_one_fd(fd, POLLIN, 2 * 1000) != 1)
1779 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1780 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1782 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1783 { where = US"recv"; goto bad2; }
1786 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1789 return string_copyn(buf, len);
1792 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1797 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1802 /*************************************************
1803 * Find value of a variable *
1804 *************************************************/
1806 /* The table of variables is kept in alphabetic order, so we can search it
1807 using a binary chop. The "choplen" variable is nothing to do with the binary
1811 name the name of the variable being sought
1812 exists_only TRUE if this is a def: test; passed on to find_header()
1813 skipping TRUE => skip any processing evaluation; this is not the same as
1814 exists_only because def: may test for values that are first
1816 newsize pointer to an int which is initially zero; if the answer is in
1817 a new memory buffer, *newsize is set to its size
1819 Returns: NULL if the variable does not exist, or
1820 a pointer to the variable's contents, or
1821 something non-NULL if exists_only is TRUE
1824 static const uschar *
1825 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1832 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1833 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1834 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1835 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1836 (this gave backwards compatibility at the changeover). There may be built-in
1837 variables whose names start acl_ but they should never start in this way. This
1838 slightly messy specification is a consequence of the history, needless to say.
1840 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1841 set, in which case give an error. */
1843 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1847 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1848 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1850 else if (Ustrncmp(name, "r_", 2) == 0)
1852 tree_node * node = tree_search(router_var, name + 2);
1853 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1856 /* Handle $auth<n> variables. */
1858 if (Ustrncmp(name, "auth", 4) == 0)
1861 int n = Ustrtoul(name + 4, &endptr, 10);
1862 if (!*endptr && n != 0 && n <= AUTH_VARS)
1863 return auth_vars[n-1] ? auth_vars[n-1] : US"";
1865 else if (Ustrncmp(name, "regex", 5) == 0)
1868 int n = Ustrtoul(name + 5, &endptr, 10);
1869 if (!*endptr && n != 0 && n <= REGEX_VARS)
1870 return regex_vars[n-1] ? regex_vars[n-1] : US"";
1873 /* For all other variables, search the table */
1875 if (!(vp = find_var_ent(name)))
1876 return NULL; /* Unknown variable name */
1878 /* Found an existing variable. If in skipping state, the value isn't needed,
1879 and we want to avoid processing (such as looking up the host name). */
1887 case vtype_filter_int:
1888 if (!f.filter_running) return NULL;
1892 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1896 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1900 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1904 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1908 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1911 case vtype_stringptr: /* Pointer to string */
1912 return (s = *((uschar **)(val))) ? s : US"";
1915 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1918 case vtype_load_avg:
1919 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1922 case vtype_host_lookup: /* Lookup if not done so */
1923 if ( !sender_host_name && sender_host_address
1924 && !host_lookup_failed && host_name_lookup() == OK)
1925 host_build_sender_fullhost();
1926 return sender_host_name ? sender_host_name : US"";
1928 case vtype_localpart: /* Get local part from address */
1929 if (!(s = *((uschar **)(val)))) return US"";
1930 if (!(domain = Ustrrchr(s, '@'))) return s;
1931 if (domain - s > sizeof(var_buffer) - 1)
1932 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1933 " in string expansion", sizeof(var_buffer));
1934 return string_copyn(s, domain - s);
1936 case vtype_domain: /* Get domain from address */
1937 if (!(s = *((uschar **)(val)))) return US"";
1938 domain = Ustrrchr(s, '@');
1939 return domain ? domain + 1 : US"";
1941 case vtype_msgheaders:
1942 return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL);
1944 case vtype_msgheaders_raw:
1945 return find_header(NULL, newsize,
1946 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL);
1948 case vtype_msgbody: /* Pointer to msgbody string */
1949 case vtype_msgbody_end: /* Ditto, the end of the msg */
1950 ss = (uschar **)(val);
1951 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1954 off_t start_offset = SPOOL_DATA_START_OFFSET;
1955 int len = message_body_visible;
1957 if (len > message_size) len = message_size;
1958 *ss = body = store_get(len+1, GET_TAINTED);
1960 if (vp->type == vtype_msgbody_end)
1962 struct stat statbuf;
1963 if (fstat(deliver_datafile, &statbuf) == 0)
1965 start_offset = statbuf.st_size - len;
1966 if (start_offset < SPOOL_DATA_START_OFFSET)
1967 start_offset = SPOOL_DATA_START_OFFSET;
1970 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
1971 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
1973 if ((len = read(deliver_datafile, body, len)) > 0)
1976 if (message_body_newlines) /* Separate loops for efficiency */
1978 { if (body[--len] == 0) body[len] = ' '; }
1981 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
1984 return *ss ? *ss : US"";
1986 case vtype_todbsdin: /* BSD inbox time of day */
1987 return tod_stamp(tod_bsdin);
1989 case vtype_tode: /* Unix epoch time of day */
1990 return tod_stamp(tod_epoch);
1992 case vtype_todel: /* Unix epoch/usec time of day */
1993 return tod_stamp(tod_epoch_l);
1995 case vtype_todf: /* Full time of day */
1996 return tod_stamp(tod_full);
1998 case vtype_todl: /* Log format time of day */
1999 return tod_stamp(tod_log_bare); /* (without timezone) */
2001 case vtype_todzone: /* Time zone offset only */
2002 return tod_stamp(tod_zone);
2004 case vtype_todzulu: /* Zulu time */
2005 return tod_stamp(tod_zulu);
2007 case vtype_todlf: /* Log file datestamp tod */
2008 return tod_stamp(tod_log_datestamp_daily);
2010 case vtype_reply: /* Get reply address */
2011 s = find_header(US"reply-to:", newsize,
2012 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2014 if (s) Uskip_whitespace(&s);
2017 *newsize = 0; /* For the *s==0 case */
2018 s = find_header(US"from:", newsize,
2019 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2025 Uskip_whitespace(&s);
2026 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2027 while (t > s && isspace(t[-1])) t--;
2030 return s ? s : US"";
2032 case vtype_string_func:
2034 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2036 return s ? s : US"";
2042 sprintf(CS var_buffer, PR_EXIM_ARITH,
2043 receive_statvfs(val == (void *)TRUE, &inodes));
2050 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2051 sprintf(CS var_buffer, "%d", inodes);
2056 return *(void **)val ? US"<cert>" : US"";
2058 #ifndef DISABLE_DKIM
2060 return dkim_exim_expand_query((int)(long)val);
2065 return NULL; /* Unknown variable. Silences static checkers. */
2072 modify_variable(uschar *name, void * value)
2075 if ((vp = find_var_ent(name))) vp->value = value;
2076 return; /* Unknown variable name, fail silently */
2084 /*************************************************
2085 * Read and expand substrings *
2086 *************************************************/
2088 /* This function is called to read and expand argument substrings for various
2089 expansion items. Some have a minimum requirement that is less than the maximum;
2090 in these cases, the first non-present one is set to NULL.
2093 sub points to vector of pointers to set
2094 n maximum number of substrings
2096 sptr points to current string pointer
2097 skipping the skipping flag
2098 check_end if TRUE, check for final '}'
2099 name name of item, for error message
2100 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2102 textonly_p if not NULL, pointer to bitmask of which subs were text-only
2103 (did not change when expended)
2105 Returns: 0 OK; string pointer updated
2106 1 curly bracketing error (too few arguments)
2107 2 too many arguments (only if check_end is set); message set
2108 3 other error (expansion failure)
2112 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2113 BOOL check_end, uschar *name, BOOL *resetok, unsigned * textonly_p)
2115 const uschar * s = *sptr;
2116 unsigned textonly_l = 0;
2118 Uskip_whitespace(&s);
2119 for (int i = 0; i < n; i++)
2126 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2127 "(min is %d)", name, m);
2133 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok,
2134 textonly_p ? &textonly : NULL)))
2136 if (*s++ != '}') return 1;
2137 if (textonly_p && textonly) textonly_l |= BIT(i);
2138 Uskip_whitespace(&s);
2140 if (check_end && *s++ != '}')
2144 expand_string_message = string_sprintf("Too many arguments for '%s' "
2145 "(max is %d)", name, n);
2148 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2152 if (textonly_p) *textonly_p = textonly_l;
2160 /*************************************************
2161 * Elaborate message for bad variable *
2162 *************************************************/
2164 /* For the "unknown variable" message, take a look at the variable's name, and
2165 give additional information about possible ACL variables. The extra information
2166 is added on to expand_string_message.
2168 Argument: the name of the variable
2173 check_variable_error_message(uschar *name)
2175 if (Ustrncmp(name, "acl_", 4) == 0)
2176 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2177 (name[4] == 'c' || name[4] == 'm')?
2179 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2180 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2182 US"user-defined ACL variables must start acl_c or acl_m");
2188 Load args from sub array to globals, and call acl_check().
2189 Sub array will be corrupted on return.
2191 Returns: OK access is granted by an ACCEPT verb
2192 DISCARD access is (apparently) granted by a DISCARD verb
2193 FAIL access is denied
2194 FAIL_DROP access is denied; drop the connection
2195 DEFER can't tell at the moment
2199 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2202 int sav_narg = acl_narg;
2204 uschar * dummy_logmsg;
2205 extern int acl_where;
2207 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2208 for (i = 0; i < nsub && sub[i+1]; i++)
2210 uschar * tmp = acl_arg[i];
2211 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2212 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2217 sub[i+1] = acl_arg[i];
2218 acl_arg[i++] = NULL;
2222 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2224 acl_narg>0 ? acl_arg[0] : US"<none>",
2225 acl_narg>1 ? " +more" : "");
2227 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2229 for (i = 0; i < nsub; i++)
2230 acl_arg[i] = sub[i+1]; /* restore old args */
2231 acl_narg = sav_narg;
2239 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2240 The given string is modified on return. Leading whitespace is skipped while
2241 looking for the opening wrap character, then the rest is scanned for the trailing
2242 (non-escaped) wrap character. A backslash in the string will act as an escape.
2244 A nul is written over the trailing wrap, and a pointer to the char after the
2245 leading wrap is returned.
2248 s String for de-wrapping
2249 wrap Two-char string, the first being the opener, second the closer wrapping
2252 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2256 dewrap(uschar * s, const uschar * wrap)
2260 BOOL quotesmode = wrap[0] == wrap[1];
2262 if (Uskip_whitespace(&p) == *wrap)
2268 if (*p == '\\') p++;
2269 else if (!quotesmode && *p == wrap[-1]) depth++;
2270 else if (*p == *wrap)
2281 expand_string_message = string_sprintf("missing '%c'", *wrap);
2286 /* Pull off the leading array or object element, returning
2287 a copy in an allocated string. Update the list pointer.
2289 The element may itself be an abject or array.
2290 Return NULL when the list is empty.
2294 json_nextinlist(const uschar ** list)
2296 unsigned array_depth = 0, object_depth = 0;
2297 const uschar * s = *list, * item;
2299 skip_whitespace(&s);
2302 *s && (*s != ',' || array_depth != 0 || object_depth != 0);
2306 case '[': array_depth++; break;
2307 case ']': array_depth--; break;
2308 case '{': object_depth++; break;
2309 case '}': object_depth--; break;
2311 *list = *s ? s+1 : s;
2312 if (item == s) return NULL;
2313 item = string_copyn(item, s - item);
2314 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2320 /************************************************/
2321 /* Return offset in ops table, or -1 if not found.
2322 Repoint to just after the operator in the string.
2325 ss string representation of operator
2326 opname split-out operator name
2330 identify_operator(const uschar ** ss, uschar ** opname)
2332 const uschar * s = *ss;
2335 /* Numeric comparisons are symbolic */
2337 if (*s == '=' || *s == '>' || *s == '<')
2349 /* All other conditions are named */
2352 s = read_name(name, sizeof(name), s, US"_");
2355 /* If we haven't read a name, it means some non-alpha character is first. */
2359 expand_string_message = string_sprintf("condition name expected, "
2360 "but found \"%.16s\"", s);
2364 *opname = string_copy(name);
2366 return chop_match(name, cond_table, nelem(cond_table));
2370 /*************************************************
2371 * Handle MD5 or SHA-1 computation for HMAC *
2372 *************************************************/
2374 /* These are some wrapping functions that enable the HMAC code to be a bit
2375 cleaner. A good compiler will spot the tail recursion.
2378 type HMAC_MD5 or HMAC_SHA1
2379 remaining are as for the cryptographic hash functions
2385 chash_start(int type, void * base)
2387 if (type == HMAC_MD5)
2388 md5_start((md5 *)base);
2390 sha1_start((hctx *)base);
2394 chash_mid(int type, void * base, const uschar * string)
2396 if (type == HMAC_MD5)
2397 md5_mid((md5 *)base, string);
2399 sha1_mid((hctx *)base, string);
2403 chash_end(int type, void * base, const uschar * string, int length,
2406 if (type == HMAC_MD5)
2407 md5_end((md5 *)base, string, length, digest);
2409 sha1_end((hctx *)base, string, length, digest);
2416 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2417 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2420 key encoding key, nul-terminated
2421 src data to be hashed, nul-terminated
2423 len size of output buffer
2427 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2430 const uschar * keyptr;
2432 unsigned int keylen;
2434 #define MD5_HASHLEN 16
2435 #define MD5_HASHBLOCKLEN 64
2437 uschar keyhash[MD5_HASHLEN];
2438 uschar innerhash[MD5_HASHLEN];
2439 uschar finalhash[MD5_HASHLEN];
2440 uschar innerkey[MD5_HASHBLOCKLEN];
2441 uschar outerkey[MD5_HASHBLOCKLEN];
2444 keylen = Ustrlen(keyptr);
2446 /* If the key is longer than the hash block length, then hash the key
2449 if (keylen > MD5_HASHBLOCKLEN)
2451 chash_start(HMAC_MD5, &md5_base);
2452 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2454 keylen = MD5_HASHLEN;
2457 /* Now make the inner and outer key values */
2459 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2460 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2462 for (int i = 0; i < keylen; i++)
2464 innerkey[i] ^= keyptr[i];
2465 outerkey[i] ^= keyptr[i];
2468 /* Now do the hashes */
2470 chash_start(HMAC_MD5, &md5_base);
2471 chash_mid(HMAC_MD5, &md5_base, innerkey);
2472 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2474 chash_start(HMAC_MD5, &md5_base);
2475 chash_mid(HMAC_MD5, &md5_base, outerkey);
2476 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2478 /* Encode the final hash as a hex string, limited by output buffer size */
2481 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2483 if (j-- <= 0) break;
2484 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2485 if (j-- <= 0) break;
2486 *p++ = hex_digits[finalhash[i] & 0x0f];
2490 #endif /*SUPPORT_SRS*/
2493 /*************************************************
2494 * Read and evaluate a condition *
2495 *************************************************/
2499 s points to the start of the condition text
2500 resetok points to a BOOL which is written false if it is unsafe to
2501 free memory. Certain condition types (acl) may have side-effect
2502 allocation which must be preserved.
2503 yield points to a BOOL to hold the result of the condition test;
2504 if NULL, we are just reading through a condition that is
2505 part of an "or" combination to check syntax, or in a state
2506 where the answer isn't required
2508 Returns: a pointer to the first character after the condition, or
2512 static const uschar *
2513 eval_condition(const uschar * s, BOOL * resetok, BOOL * yield)
2515 BOOL testfor = TRUE;
2516 BOOL tempcond, combined_cond;
2518 BOOL sub2_honour_dollar = TRUE;
2519 BOOL is_forany, is_json, is_jsons;
2521 int_eximarith_t num[2];
2522 struct stat statbuf;
2525 const uschar * sub[10];
2526 unsigned sub_textonly = 0;
2529 if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break;
2531 switch(cond_type = identify_operator(&s, &opname))
2533 /* def: tests for a non-empty variable, or for the existence of a header. If
2534 yield == NULL we are in a skipping state, and don't care about the answer. */
2542 expand_string_message = US"\":\" expected after \"def\"";
2546 s = read_name(name, sizeof(name), s+1, US"_");
2548 /* Test for a header's existence. If the name contains a closing brace
2549 character, this may be a user error where the terminating colon has been
2550 omitted. Set a flag to adjust a subsequent error message in this case. */
2552 if ( ( *(t = name) == 'h'
2553 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2555 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2558 s = read_header_name(name, sizeof(name), s);
2559 /* {-for-text-editors */
2560 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2562 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2565 /* Test for a variable's having a non-empty value. A non-existent variable
2566 causes an expansion failure. */
2570 if (!(t = find_variable(name, TRUE, yield == NULL, NULL)))
2572 expand_string_message = name[0]
2573 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2574 : US"variable name omitted after \"def:\"";
2575 check_variable_error_message(name);
2578 if (yield) *yield = (t[0] != 0) == testfor;
2585 /* first_delivery tests for first delivery attempt */
2587 case ECOND_FIRST_DELIVERY:
2588 if (yield) *yield = f.deliver_firsttime == testfor;
2592 /* queue_running tests for any process started by a queue runner */
2594 case ECOND_QUEUE_RUNNING:
2595 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2599 /* exists: tests for file existence
2600 isip: tests for any IP address
2601 isip4: tests for an IPv4 address
2602 isip6: tests for an IPv6 address
2603 pam: does PAM authentication
2604 radius: does RADIUS authentication
2605 ldapauth: does LDAP authentication
2606 pwcheck: does Cyrus SASL pwcheck authentication
2615 case ECOND_LDAPAUTH:
2618 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, &textonly);
2623 if (!sub[0]) return NULL;
2624 if (textonly) sub_textonly |= BIT(0);
2626 /* {-for-text-editors */
2627 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2629 if (!yield) return s; /* No need to run the test if skipping */
2634 if ((expand_forbid & RDO_EXISTS) != 0)
2636 expand_string_message = US"File existence tests are not permitted";
2639 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2645 rc = string_is_ip_address(sub[0], NULL);
2646 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2647 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2650 /* Various authentication tests - all optionally compiled */
2654 rc = auth_call_pam(sub[0], &expand_string_message);
2657 goto COND_FAILED_NOT_COMPILED;
2658 #endif /* SUPPORT_PAM */
2661 #ifdef RADIUS_CONFIG_FILE
2662 rc = auth_call_radius(sub[0], &expand_string_message);
2665 goto COND_FAILED_NOT_COMPILED;
2666 #endif /* RADIUS_CONFIG_FILE */
2668 case ECOND_LDAPAUTH:
2671 /* Just to keep the interface the same */
2673 int old_pool = store_pool;
2674 store_pool = POOL_SEARCH;
2675 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2676 &expand_string_message, &do_cache);
2677 store_pool = old_pool;
2681 goto COND_FAILED_NOT_COMPILED;
2682 #endif /* LOOKUP_LDAP */
2685 #ifdef CYRUS_PWCHECK_SOCKET
2686 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2689 goto COND_FAILED_NOT_COMPILED;
2690 #endif /* CYRUS_PWCHECK_SOCKET */
2692 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2693 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2695 if (rc == ERROR || rc == DEFER) return NULL;
2696 *yield = (rc == OK) == testfor;
2702 /* call ACL (in a conditional context). Accept true, deny false.
2703 Defer is a forced-fail. Anything set by message= goes to $value.
2704 Up to ten parameters are used; we use the braces round the name+args
2705 like the saslauthd condition does, to permit a variable number of args.
2706 See also the expansion-item version EITEM_ACL and the traditional
2707 acl modifier ACLC_ACL.
2708 Since the ACL may allocate new global variables, tell our caller to not
2713 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2719 Uskip_whitespace(&s);
2720 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2722 switch(read_subs(sub, nelem(sub), 1,
2723 &s, yield == NULL, TRUE, name, resetok, NULL))
2725 case 1: expand_string_message = US"too few arguments or bracketing "
2728 case 3: return NULL;
2734 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2735 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2740 lookup_value = NULL;
2742 lookup_value = string_copy(user_msg);
2743 *yield = cond == testfor;
2747 f.expand_string_forcedfail = TRUE;
2750 expand_string_message = string_sprintf("%s from acl \"%s\"",
2751 rc_names[rc], sub[0]);
2759 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2761 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2763 However, the last two are optional. That is why the whole set is enclosed
2764 in their own set of braces. */
2766 case ECOND_SASLAUTHD:
2767 #ifndef CYRUS_SASLAUTHD_SOCKET
2768 goto COND_FAILED_NOT_COMPILED;
2772 Uskip_whitespace(&s);
2773 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2774 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, name,
2777 case 1: expand_string_message = US"too few arguments or bracketing "
2778 "error for saslauthd";
2780 case 3: return NULL;
2782 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2785 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2786 &expand_string_message);
2787 if (rc == ERROR || rc == DEFER) return NULL;
2788 *yield = (rc == OK) == testfor;
2792 #endif /* CYRUS_SASLAUTHD_SOCKET */
2795 /* symbolic operators for numeric and string comparison, and a number of
2796 other operators, all requiring two arguments.
2798 crypteq: encrypts plaintext and compares against an encrypted text,
2799 using crypt(), crypt16(), MD5 or SHA-1
2800 inlist/inlisti: checks if first argument is in the list of the second
2801 match: does a regular expression match and sets up the numerical
2802 variables if it succeeds
2803 match_address: matches in an address list
2804 match_domain: matches in a domain list
2805 match_ip: matches a host list that is restricted to IP addresses
2806 match_local_part: matches in a local part list
2809 case ECOND_MATCH_ADDRESS:
2810 case ECOND_MATCH_DOMAIN:
2811 case ECOND_MATCH_IP:
2812 case ECOND_MATCH_LOCAL_PART:
2813 #ifndef EXPAND_LISTMATCH_RHS
2814 sub2_honour_dollar = FALSE;
2823 case ECOND_NUM_L: /* Numerical comparisons */
2830 case ECOND_STR_LT: /* String comparisons */
2841 for (int i = 0; i < 2; i++)
2844 /* Sometimes, we don't expand substrings; too many insecure configurations
2845 created using match_address{}{} and friends, where the second param
2846 includes information from untrustworthy sources. */
2847 /*XXX is this moot given taint-tracking? */
2848 BOOL honour_dollar = TRUE;
2849 if ((i > 0) && !sub2_honour_dollar)
2850 honour_dollar = FALSE;
2852 if (Uskip_whitespace(&s) != '{')
2854 if (i == 0) goto COND_FAILED_CURLY_START;
2855 expand_string_message = string_sprintf("missing 2nd string in {} "
2856 "after \"%s\"", opname);
2859 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2860 honour_dollar, resetok, &textonly)))
2862 if (textonly) sub_textonly |= BIT(i);
2863 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2864 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2865 " for security reasons\n");
2866 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2868 /* Convert to numerical if required; we know that the names of all the
2869 conditions that compare numbers do not start with a letter. This just saves
2870 checking for them individually. */
2872 if (!isalpha(opname[0]) && yield)
2877 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2881 num[i] = expanded_string_integer(sub[i], FALSE);
2882 if (expand_string_message) return NULL;
2886 /* Result not required */
2888 if (!yield) return s;
2890 /* Do an appropriate comparison */
2896 tempcond = (num[0] == num[1]); break;
2899 tempcond = (num[0] > num[1]); break;
2902 tempcond = (num[0] >= num[1]); break;
2905 tempcond = (num[0] < num[1]); break;
2908 tempcond = (num[0] <= num[1]); break;
2911 tempcond = (Ustrcmp(sub[0], sub[1]) < 0); break;
2914 tempcond = (strcmpic(sub[0], sub[1]) < 0); break;
2917 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0); break;
2920 tempcond = (strcmpic(sub[0], sub[1]) <= 0); break;
2923 tempcond = (Ustrcmp(sub[0], sub[1]) == 0); break;
2926 tempcond = (strcmpic(sub[0], sub[1]) == 0); break;
2929 tempcond = (Ustrcmp(sub[0], sub[1]) > 0); break;
2932 tempcond = (strcmpic(sub[0], sub[1]) > 0); break;
2935 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0); break;
2938 tempcond = (strcmpic(sub[0], sub[1]) >= 0); break;
2940 case ECOND_MATCH: /* Regular expression match */
2942 const pcre2_code * re = regex_compile(sub[1],
2943 sub_textonly & BIT(1) ? MCS_CACHEABLE : MCS_NOFLAGS,
2944 &expand_string_message, pcre_gen_cmp_ctx);
2948 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2952 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2953 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0,
2954 CUSS &lookup_value);
2955 goto MATCHED_SOMETHING;
2957 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2958 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2959 MCL_DOMAIN + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
2960 goto MATCHED_SOMETHING;
2962 case ECOND_MATCH_IP: /* Match IP address in a host list */
2963 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2965 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2971 unsigned int *nullcache = NULL;
2972 check_host_block cb;
2974 cb.host_name = US"";
2975 cb.host_address = sub[0];
2977 /* If the host address starts off ::ffff: it is an IPv6 address in
2978 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2981 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2982 cb.host_address + 7 : cb.host_address;
2984 rc = match_check_list(
2985 &sub[1], /* the list */
2986 0, /* separator character */
2987 &hostlist_anchor, /* anchor pointer */
2988 &nullcache, /* cache pointer */
2989 check_host, /* function for testing */
2990 &cb, /* argument for function */
2991 MCL_HOST, /* type of check */
2992 sub[0], /* text for debugging */
2993 CUSS &lookup_value); /* where to pass back data */
2995 goto MATCHED_SOMETHING;
2997 case ECOND_MATCH_LOCAL_PART:
2998 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
2999 MCL_LOCALPART + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
3005 case OK: tempcond = TRUE; break;
3006 case FAIL: tempcond = FALSE; break;
3009 expand_string_message = string_sprintf("unable to complete match "
3010 "against \"%s\": %s", sub[1], search_error_message);
3016 /* Various "encrypted" comparisons. If the second string starts with
3017 "{" then an encryption type is given. Default to crypt() or crypt16()
3018 (build-time choice). */
3019 /* }-for-text-editors */
3022 #ifndef SUPPORT_CRYPTEQ
3023 goto COND_FAILED_NOT_COMPILED;
3025 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3027 int sublen = Ustrlen(sub[1]+5);
3032 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3034 /* If the length that we are comparing against is 24, the MD5 digest
3035 is expressed as a base64 string. This is the way LDAP does it. However,
3036 some other software uses a straightforward hex representation. We assume
3037 this if the length is 32. Other lengths fail. */
3041 uschar *coded = b64encode(CUS digest, 16);
3042 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3043 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3044 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3046 else if (sublen == 32)
3049 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3051 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3052 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3053 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3057 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3058 "fail\n crypted=%s\n", sub[1]+5);
3063 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3065 int sublen = Ustrlen(sub[1]+6);
3070 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3072 /* If the length that we are comparing against is 28, assume the SHA1
3073 digest is expressed as a base64 string. If the length is 40, assume a
3074 straightforward hex representation. Other lengths fail. */
3078 uschar *coded = b64encode(CUS digest, 20);
3079 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3080 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3081 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3083 else if (sublen == 40)
3086 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3088 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3089 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3090 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3094 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3095 "fail\n crypted=%s\n", sub[1]+6);
3100 else /* {crypt} or {crypt16} and non-{ at start */
3101 /* }-for-text-editors */
3106 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3111 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3116 else if (sub[1][0] == '{') /* }-for-text-editors */
3118 expand_string_message = string_sprintf("unknown encryption mechanism "
3119 "in \"%s\"", sub[1]);
3125 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3126 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3127 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3131 #define XSTR(s) STR(s)
3132 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3133 " subject=%s\n crypted=%s\n",
3134 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3139 /* If the encrypted string contains fewer than two characters (for the
3140 salt), force failure. Otherwise we get false positives: with an empty
3141 string the yield of crypt() is an empty string! */
3144 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3145 else if (errno == EINVAL)
3149 expand_string_message = string_sprintf("crypt error: %s\n",
3150 US strerror(errno));
3155 #endif /* SUPPORT_CRYPTEQ */
3160 const uschar * list = sub[1];
3162 uschar *save_iterate_item = iterate_item;
3163 int (*compare)(const uschar *, const uschar *);
3165 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3168 compare = cond_type == ECOND_INLISTI
3169 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3171 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3173 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3174 if (compare(sub[0], iterate_item) == 0)
3177 lookup_value = iterate_item;
3181 iterate_item = save_iterate_item;
3184 } /* Switch for comparison conditions */
3186 *yield = tempcond == testfor;
3187 return s; /* End of comparison conditions */
3190 /* and/or: computes logical and/or of several conditions */
3194 subcondptr = (yield == NULL) ? NULL : &tempcond;
3195 combined_cond = (cond_type == ECOND_AND);
3197 Uskip_whitespace(&s);
3198 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3202 /* {-for-text-editors */
3203 if (Uskip_whitespace(&s) == '}') break;
3204 if (*s != '{') /* }-for-text-editors */
3206 expand_string_message = string_sprintf("each subcondition "
3207 "inside an \"%s{...}\" condition must be in its own {}", opname);
3211 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3213 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3214 expand_string_message, opname);
3217 Uskip_whitespace(&s);
3219 /* {-for-text-editors */
3222 /* {-for-text-editors */
3223 expand_string_message = string_sprintf("missing } at end of condition "
3224 "inside \"%s\" group", opname);
3229 if (cond_type == ECOND_AND)
3231 combined_cond &= tempcond;
3232 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3233 } /* evaluate any more */
3236 combined_cond |= tempcond;
3237 if (combined_cond) subcondptr = NULL; /* once true, don't */
3238 } /* evaluate any more */
3241 if (yield) *yield = (combined_cond == testfor);
3245 /* forall/forany: iterates a condition with different values */
3247 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3248 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3249 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3250 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3251 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3252 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3256 const uschar * list;
3258 uschar *save_iterate_item = iterate_item;
3260 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3262 Uskip_whitespace(&s);
3263 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3264 if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok, NULL)))
3266 /* {-for-text-editors */
3267 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3269 Uskip_whitespace(&s);
3270 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3274 /* Call eval_condition once, with result discarded (as if scanning a
3275 "false" part). This allows us to find the end of the condition, because if
3276 the list it empty, we won't actually evaluate the condition for real. */
3278 if (!(s = eval_condition(sub[1], resetok, NULL)))
3280 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3281 expand_string_message, opname);
3284 Uskip_whitespace(&s);
3286 /* {-for-text-editors */
3289 /* {-for-text-editors */
3290 expand_string_message = string_sprintf("missing } at end of condition "
3291 "inside \"%s\"", opname);
3295 if (yield) *yield = !testfor;
3297 if (is_json) list = dewrap(string_copy(list), US"[]");
3298 while ((iterate_item = is_json
3299 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3302 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3304 expand_string_message =
3305 string_sprintf("%s wrapping string result for extract jsons",
3306 expand_string_message);
3307 iterate_item = save_iterate_item;
3311 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3312 if (!eval_condition(sub[1], resetok, &tempcond))
3314 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3315 expand_string_message, opname);
3316 iterate_item = save_iterate_item;
3319 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3320 tempcond? "true":"false");
3322 if (yield) *yield = (tempcond == testfor);
3323 if (tempcond == is_forany) break;
3326 iterate_item = save_iterate_item;
3331 /* The bool{} expansion condition maps a string to boolean.
3332 The values supported should match those supported by the ACL condition
3333 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3334 of true/false. Note that Router "condition" rules have a different
3335 interpretation, where general data can be used and only a few values
3337 Note that readconf.c boolean matching, for boolean configuration options,
3338 only matches true/yes/false/no.
3339 The bool_lax{} condition matches the Router logic, which is much more
3342 case ECOND_BOOL_LAX:
3348 BOOL boolvalue = FALSE;
3350 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3351 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3352 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok, NULL))
3354 case 1: expand_string_message = string_sprintf(
3355 "too few arguments or bracketing error for %s",
3359 case 3: return NULL;
3362 Uskip_whitespace(&t);
3363 if ((len = Ustrlen(t)))
3365 /* trailing whitespace: seems like a good idea to ignore it too */
3367 while (isspace(*t2)) t2--;
3368 if (t2 != (t + len))
3375 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3376 /* logic for the lax case from expand_check_condition(), which also does
3377 expands, and the logic is both short and stable enough that there should
3378 be no maintenance burden from replicating it. */
3382 ? Ustrspn(t+1, "0123456789") == len-1
3383 : Ustrspn(t, "0123456789") == len)
3385 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3386 /* expand_check_condition only does a literal string "0" check */
3387 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3390 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3392 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3394 else if (cond_type == ECOND_BOOL_LAX)
3398 expand_string_message = string_sprintf("unrecognised boolean "
3402 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3403 boolvalue? "true":"false");
3404 if (yield) *yield = (boolvalue == testfor);
3409 case ECOND_INBOUND_SRS:
3410 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3413 const pcre2_code * re;
3414 pcre2_match_data * md;
3418 BOOL boolvalue = FALSE;
3420 switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, name, resetok, NULL))
3422 case 1: expand_string_message = US"too few arguments or bracketing "
3423 "error for inbound_srs";
3425 case 3: return NULL;
3428 /* Match the given local_part against the SRS-encoded pattern */
3430 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$",
3431 MCS_CASELESS | MCS_CACHEABLE, FALSE);
3432 md = pcre2_match_data_create(4+1, pcre_gen_ctx);
3433 if (pcre2_match(re, sub[0], PCRE2_ZERO_TERMINATED, 0, PCRE_EOPT,
3434 md, pcre_gen_mtc_ctx) < 0)
3436 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3439 ovec = pcre2_get_ovector_pointer(md);
3441 if (sub[0][0] == '"')
3443 else for (uschar * s = sub[0]; *s; s++)
3444 if (!isalnum(*s) && Ustrchr(".!#$%&'*+-/=?^_`{|}~", *s) == NULL)
3445 { quoting = 1; break; }
3447 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
3449 /* Record the (quoted, if needed) decoded recipient as $srs_recipient */
3451 srs_recipient = string_sprintf("%.*s%.*S%.*s@%.*S", /* lowercased */
3453 (int) (ovec[9]-ovec[8]), sub[0] + ovec[8], /* substr 4 */
3455 (int) (ovec[7]-ovec[6]), sub[0] + ovec[6]); /* substr 3 */
3457 /* If a zero-length secret was given, we're done. Otherwise carry on
3458 and validate the given SRS local_part againt our secret. */
3466 /* check the timestamp */
3469 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3473 gettimeofday(&now, NULL);
3474 now.tv_sec /= 86400; /* days since epoch */
3476 /* Decode substring 2 from base32 to a number */
3478 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3480 uschar * t = Ustrchr(base32_chars, *ss++);
3481 d = d * 32 + (t - base32_chars);
3484 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3486 DEBUG(D_expand) debug_printf("SRS too old\n");
3491 /* check length of substring 1, the offered checksum */
3493 if (ovec[3]-ovec[2] != 4)
3495 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3499 /* Hash the address with our secret, and compare that computed checksum
3500 with the one extracted from the arg */
3502 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3503 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3505 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3511 /* pcre2_match_data_free(md); gen ctx needs no free */
3512 if (yield) *yield = (boolvalue == testfor);
3515 #endif /*SUPPORT_SRS*/
3517 /* Unknown condition */
3520 if (!expand_string_message || !*expand_string_message)
3521 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3523 } /* End switch on condition type */
3525 /* Missing braces at start and end of data */
3527 COND_FAILED_CURLY_START:
3528 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3531 COND_FAILED_CURLY_END:
3532 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3536 /* A condition requires code that is not compiled */
3538 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3539 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3540 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3541 COND_FAILED_NOT_COMPILED:
3542 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3551 /*************************************************
3552 * Save numerical variables *
3553 *************************************************/
3555 /* This function is called from items such as "if" that want to preserve and
3556 restore the numbered variables.
3559 save_expand_string points to an array of pointers to set
3560 save_expand_nlength points to an array of ints for the lengths
3562 Returns: the value of expand max to save
3566 save_expand_strings(const uschar **save_expand_nstring, int *save_expand_nlength)
3568 for (int i = 0; i <= expand_nmax; i++)
3570 save_expand_nstring[i] = expand_nstring[i];
3571 save_expand_nlength[i] = expand_nlength[i];
3578 /*************************************************
3579 * Restore numerical variables *
3580 *************************************************/
3582 /* This function restored saved values of numerical strings.
3585 save_expand_nmax the number of strings to restore
3586 save_expand_string points to an array of pointers
3587 save_expand_nlength points to an array of ints
3593 restore_expand_strings(int save_expand_nmax, const uschar **save_expand_nstring,
3594 int *save_expand_nlength)
3596 expand_nmax = save_expand_nmax;
3597 for (int i = 0; i <= expand_nmax; i++)
3599 expand_nstring[i] = save_expand_nstring[i];
3600 expand_nlength[i] = save_expand_nlength[i];
3608 /*************************************************
3609 * Handle yes/no substrings *
3610 *************************************************/
3612 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3613 alternative substrings that depend on whether or not the condition was true,
3614 or the lookup or extraction succeeded. The substrings always have to be
3615 expanded, to check their syntax, but "skipping" is set when the result is not
3616 needed - this avoids unnecessary nested lookups.
3619 skipping TRUE if we were skipping when this item was reached
3620 yes TRUE if the first string is to be used, else use the second
3621 save_lookup a value to put back into lookup_value before the 2nd expansion
3622 sptr points to the input string pointer
3623 yieldptr points to the output growable-string pointer
3624 type "lookup", "if", "extract", "run", "env", "listextract" or
3625 "certextract" for error message
3626 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3629 Returns: 0 OK; lookup_value has been reset to save_lookup
3631 2 expansion failed because of bracketing error
3635 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3636 gstring ** yieldptr, uschar *type, BOOL *resetok)
3639 const uschar *s = *sptr; /* Local value */
3640 uschar *sub1, *sub2;
3641 const uschar * errwhere;
3643 /* If there are no following strings, we substitute the contents of $value for
3644 lookups and for extractions in the success case. For the ${if item, the string
3645 "true" is substituted. In the fail case, nothing is substituted for all three
3648 if (skip_whitespace(&s) == '}')
3652 if (yes && !skipping)
3653 *yieldptr = string_catn(*yieldptr, US"true", 4);
3657 if (yes && lookup_value && !skipping)
3658 *yieldptr = string_cat(*yieldptr, lookup_value);
3659 lookup_value = save_lookup;
3665 /* The first following string must be braced. */
3669 errwhere = US"'yes' part did not start with '{'";
3673 /* Expand the first substring. Forced failures are noticed only if we actually
3674 want this string. Set skipping in the call in the fail case (this will always
3675 be the case if we were already skipping). */
3677 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok, NULL);
3678 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3679 f.expand_string_forcedfail = FALSE;
3682 errwhere = US"'yes' part did not end with '}'";
3686 /* If we want the first string, add it to the output */
3689 *yieldptr = string_cat(*yieldptr, sub1);
3691 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3692 $value to what it was at the start of the item, so that it has this value
3693 during the second string expansion. For the call from "if" or "run" to this
3694 function, save_lookup is set to lookup_value, so that this statement does
3697 lookup_value = save_lookup;
3699 /* There now follows either another substring, or "fail", or nothing. This
3700 time, forced failures are noticed only if we want the second string. We must
3701 set skipping in the nested call if we don't want this string, or if we were
3702 already skipping. */
3704 if (skip_whitespace(&s) == '{')
3706 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok, NULL);
3707 if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3708 f.expand_string_forcedfail = FALSE;
3711 errwhere = US"'no' part did not start with '{'";
3715 /* If we want the second string, add it to the output */
3718 *yieldptr = string_cat(*yieldptr, sub2);
3721 /* If there is no second string, but the word "fail" is present when the use of
3722 the second string is wanted, set a flag indicating it was a forced failure
3723 rather than a syntactic error. Swallow the terminating } in case this is nested
3724 inside another lookup or if or extract. */
3729 /* deconst cast ok here as source is s anyway */
3730 s = US read_name(name, sizeof(name), s, US"_");
3731 if (Ustrcmp(name, "fail") == 0)
3733 if (!yes && !skipping)
3735 Uskip_whitespace(&s);
3738 errwhere = US"did not close with '}' after forcedfail";
3741 expand_string_message =
3742 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3743 f.expand_string_forcedfail = TRUE;
3749 expand_string_message =
3750 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3755 /* All we have to do now is to check on the final closing brace. */
3757 skip_whitespace(&s);
3760 errwhere = US"did not close with '}'";
3766 /* Update the input pointer value before returning */
3771 /* Get here if there is a bracketing failure */
3772 expand_string_message = string_sprintf(
3773 "curly-bracket problem in conditional yes/no parsing: %s\n"
3774 " remaining string is '%s'", errwhere, --s);
3779 /* Get here for other failures */
3787 /********************************************************
3788 * prvs: Get last three digits of days since Jan 1, 1970 *
3789 ********************************************************/
3791 /* This is needed to implement the "prvs" BATV reverse
3794 Argument: integer "days" offset to add or substract to
3795 or from the current number of days.
3797 Returns: pointer to string containing the last three
3798 digits of the number of days since Jan 1, 1970,
3799 modified by the offset argument, NULL if there
3800 was an error in the conversion.
3805 prvs_daystamp(int day_offset)
3807 uschar * days = store_get(32, GET_UNTAINTED); /* Need at least 24 for cases */
3808 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3809 (time(NULL) + day_offset*86400)/86400);
3810 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3815 /********************************************************
3816 * prvs: perform HMAC-SHA1 computation of prvs bits *
3817 ********************************************************/
3819 /* This is needed to implement the "prvs" BATV reverse
3823 address RFC2821 Address to use
3824 key The key to use (must be less than 64 characters
3826 key_num Single-digit key number to use. Defaults to
3829 Returns: pointer to string containing the first three
3830 bytes of the final hash in hex format, NULL if
3831 there was an error in the process.
3835 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3837 gstring * hash_source;
3840 uschar innerhash[20];
3841 uschar finalhash[20];
3842 uschar innerkey[64];
3843 uschar outerkey[64];
3844 uschar *finalhash_hex;
3849 if (Ustrlen(key) > 64)
3852 hash_source = string_catn(NULL, key_num, 1);
3853 hash_source = string_catn(hash_source, daystamp, 3);
3854 hash_source = string_cat(hash_source, address);
3855 (void) string_from_gstring(hash_source);
3858 debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s);
3860 memset(innerkey, 0x36, 64);
3861 memset(outerkey, 0x5c, 64);
3863 for (int i = 0; i < Ustrlen(key); i++)
3865 innerkey[i] ^= key[i];
3866 outerkey[i] ^= key[i];
3869 chash_start(HMAC_SHA1, &h);
3870 chash_mid(HMAC_SHA1, &h, innerkey);
3871 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
3873 chash_start(HMAC_SHA1, &h);
3874 chash_mid(HMAC_SHA1, &h, outerkey);
3875 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
3877 /* Hashing is deemed sufficient to de-taint any input data */
3879 p = finalhash_hex = store_get(40, GET_UNTAINTED);
3880 for (int i = 0; i < 3; i++)
3882 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3883 *p++ = hex_digits[finalhash[i] & 0x0f];
3887 return finalhash_hex;
3893 /*************************************************
3894 * Join a file onto the output string *
3895 *************************************************/
3897 /* This is used for readfile/readsock and after a run expansion.
3898 It joins the contents of a file onto the output string, globally replacing
3899 newlines with a given string (optionally).
3903 yield pointer to the expandable string struct
3904 eol newline replacement string, or NULL
3906 Returns: new pointer for expandable string, terminated if non-null
3910 cat_file(FILE * f, gstring * yield, uschar * eol)
3912 uschar buffer[1024];
3914 while (Ufgets(buffer, sizeof(buffer), f))
3916 int len = Ustrlen(buffer);
3917 if (eol && buffer[len-1] == '\n') len--;
3918 yield = string_catn(yield, buffer, len);
3919 if (eol && buffer[len])
3920 yield = string_cat(yield, eol);
3928 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
3931 uschar buffer[1024];
3933 /*XXX could we read direct into a pre-grown string? */
3935 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
3936 for (uschar * s = buffer; rc--; s++)
3937 yield = eol && *s == '\n'
3938 ? string_cat(yield, eol) : string_catn(yield, s, 1);
3940 /* We assume that all errors, and any returns of zero bytes,
3941 are actually EOF. */
3948 /*************************************************
3949 * Evaluate numeric expression *
3950 *************************************************/
3952 /* This is a set of mutually recursive functions that evaluate an arithmetic
3953 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3954 these functions that is called from elsewhere is eval_expr, whose interface is:
3957 sptr pointer to the pointer to the string - gets updated
3958 decimal TRUE if numbers are to be assumed decimal
3959 error pointer to where to put an error message - must be NULL on input
3960 endket TRUE if ')' must terminate - FALSE for external call
3962 Returns: on success: the value of the expression, with *error still NULL
3963 on failure: an undefined value, with *error = a message
3966 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
3969 static int_eximarith_t
3970 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
3973 int_eximarith_t x = eval_op_or(&s, decimal, error);
3978 *error = US"expecting closing parenthesis";
3980 while (isspace(*++s));
3982 *error = US"expecting operator";
3988 static int_eximarith_t
3989 eval_number(uschar **sptr, BOOL decimal, uschar **error)
3995 if (isdigit((c = Uskip_whitespace(&s))))
3998 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4000 switch (tolower(*s))
4003 case 'k': n *= 1024; s++; break;
4004 case 'm': n *= 1024*1024; s++; break;
4005 case 'g': n *= 1024*1024*1024; s++; break;
4007 Uskip_whitespace(&s);
4012 n = eval_expr(&s, decimal, error, 1);
4016 *error = US"expecting number or opening parenthesis";
4024 static int_eximarith_t
4025 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4029 Uskip_whitespace(&s);
4030 if (*s == '+' || *s == '-' || *s == '~')
4033 x = eval_op_unary(&s, decimal, error);
4034 if (op == '-') x = -x;
4035 else if (op == '~') x = ~x;
4038 x = eval_number(&s, decimal, error);
4045 static int_eximarith_t
4046 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4049 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4052 while (*s == '*' || *s == '/' || *s == '%')
4055 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4057 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4058 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4059 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4060 * -N*M is INT_MIN will yield INT_MIN.
4061 * Since we don't support floating point, this is somewhat simpler.
4062 * Ideally, we'd return an error, but since we overflow for all other
4063 * arithmetic, consistency suggests otherwise, but what's the correct value
4064 * to use? There is none.
4065 * The C standard guarantees overflow for unsigned arithmetic but signed
4066 * overflow invokes undefined behaviour; in practice, this is overflow
4067 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4068 * that long/longlong larger than int are available, or we could just work
4069 * with larger types. We should consider whether to guarantee 32bit eval
4070 * and 64-bit working variables, with errors returned. For now ...
4071 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4072 * can just let the other invalid results occur otherwise, as they have
4073 * until now. For this one case, we can coerce.
4075 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4078 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4079 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4089 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4105 static int_eximarith_t
4106 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4109 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4112 while (*s == '+' || *s == '-')
4115 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4117 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4118 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4119 { /* over-conservative check */
4121 ? US"overflow in sum" : US"overflow in difference";
4124 if (op == '+') x += y; else x -= y;
4132 static int_eximarith_t
4133 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4136 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4139 while ((*s == '<' || *s == '>') && s[1] == s[0])
4144 y = eval_op_sum(&s, decimal, error);
4146 if (op == '<') x <<= y; else x >>= y;
4154 static int_eximarith_t
4155 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4158 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4165 y = eval_op_shift(&s, decimal, error);
4175 static int_eximarith_t
4176 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4179 int_eximarith_t x = eval_op_and(&s, decimal, error);
4186 y = eval_op_and(&s, decimal, error);
4196 static int_eximarith_t
4197 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4200 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4207 y = eval_op_xor(&s, decimal, error);
4218 /************************************************/
4219 /* Comparison operation for sort expansion. We need to avoid
4220 re-expanding the fields being compared, so need a custom routine.
4223 cond_type Comparison operator code
4224 leftarg, rightarg Arguments for comparison
4226 Return true iff (leftarg compare rightarg)
4230 sortsbefore(int cond_type, BOOL alpha_cond,
4231 const uschar * leftarg, const uschar * rightarg)
4233 int_eximarith_t l_num, r_num;
4237 l_num = expanded_string_integer(leftarg, FALSE);
4238 if (expand_string_message) return FALSE;
4239 r_num = expanded_string_integer(rightarg, FALSE);
4240 if (expand_string_message) return FALSE;
4244 case ECOND_NUM_G: return l_num > r_num;
4245 case ECOND_NUM_GE: return l_num >= r_num;
4246 case ECOND_NUM_L: return l_num < r_num;
4247 case ECOND_NUM_LE: return l_num <= r_num;
4254 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4255 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4256 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4257 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4258 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4259 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4260 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4261 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4264 return FALSE; /* should not happen */
4268 /* Expand a named list. Return false on failure. */
4270 expand_listnamed(gstring * yield, const uschar * name, const uschar * listtype)
4272 tree_node *t = NULL;
4273 const uschar * list;
4276 BOOL needsep = FALSE;
4277 #define LISTNAMED_BUF_SIZE 256
4278 uschar b[LISTNAMED_BUF_SIZE];
4279 uschar * buffer = b;
4281 if (*name == '+') name++;
4282 if (!listtype) /* no-argument version */
4284 if ( !(t = tree_search(addresslist_anchor, name))
4285 && !(t = tree_search(domainlist_anchor, name))
4286 && !(t = tree_search(hostlist_anchor, name)))
4287 t = tree_search(localpartlist_anchor, name);
4289 else switch(*listtype) /* specific list-type version */
4291 case 'a': t = tree_search(addresslist_anchor, name); break;
4292 case 'd': t = tree_search(domainlist_anchor, name); break;
4293 case 'h': t = tree_search(hostlist_anchor, name); break;
4294 case 'l': t = tree_search(localpartlist_anchor, name); break;
4296 expand_string_message = US"bad suffix on \"list\" operator";
4302 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
4304 : *listtype=='a'?"address "
4305 : *listtype=='d'?"domain "
4306 : *listtype=='h'?"host "
4307 : *listtype=='l'?"localpart "
4312 list = ((namedlist_block *)(t->data.ptr))->string;
4314 /* The list could be quite long so we (re)use a buffer for each element
4315 rather than getting each in new memory */
4317 if (is_tainted(list)) buffer = store_get(LISTNAMED_BUF_SIZE, GET_TAINTED);
4318 while ((item = string_nextinlist(&list, &sep, buffer, LISTNAMED_BUF_SIZE)))
4320 uschar * buf = US" : ";
4322 yield = string_catn(yield, buf, 3);
4326 if (*item == '+') /* list item is itself a named list */
4328 yield = expand_listnamed(yield, item, listtype);
4329 if (expand_string_message)
4333 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
4336 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
4338 for(char * cp; cp = strpbrk(CCS item, tok); item = US cp)
4340 yield = string_catn(yield, item, cp - CS item);
4341 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
4342 yield = string_catn(yield, US"::", 2);
4343 else /* sep in item; should already be doubled; emit once */
4345 yield = string_catn(yield, US tok, 1);
4346 if (*cp == sep) cp++;
4349 yield = string_cat(yield, item);
4352 yield = string_cat(yield, item);
4359 /************************************************/
4361 debug_expansion_interim(const uschar * what, const uschar * value, int nchar,
4365 debug_printf_indent("|");
4367 debug_printf_indent(UTF8_VERT_RIGHT);
4369 for (int fill = 11 - Ustrlen(what); fill > 0; fill--)
4373 debug_printf(UTF8_HORIZ);
4375 debug_printf("%s: %.*s\n", what, nchar, value);
4376 if (is_tainted(value))
4379 debug_printf_indent("%s \\__", skipping ? "| " : " ");
4381 debug_printf_indent("%s",
4383 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
4384 debug_printf("(tainted)\n");
4389 /*************************************************
4391 *************************************************/
4393 /* Returns either an unchanged string, or the expanded string in stacking pool
4394 store. Interpreted sequences are:
4396 \... normal escaping rules
4397 $name substitutes the variable
4399 ${op:string} operates on the expanded string value
4400 ${item{arg1}{arg2}...} expands the args and then does the business
4401 some literal args are not enclosed in {}
4403 There are now far too many operators and item types to make it worth listing
4404 them here in detail any more.
4406 We use an internal routine recursively to handle embedded substrings. The
4407 external function follows. The yield is NULL if the expansion failed, and there
4408 are two cases: if something collapsed syntactically, or if "fail" was given
4409 as the action on a lookup failure. These can be distinguished by looking at the
4410 variable expand_string_forcedfail, which is TRUE in the latter case.
4412 The skipping flag is set true when expanding a substring that isn't actually
4413 going to be used (after "if" or "lookup") and it prevents lookups from
4414 happening lower down.
4416 Store usage: At start, a store block of the length of the input plus 64
4417 is obtained. This is expanded as necessary by string_cat(), which might have to
4418 get a new block, or might be able to expand the original. At the end of the
4419 function we can release any store above that portion of the yield block that
4420 was actually used. In many cases this will be optimal.
4422 However: if the first item in the expansion is a variable name or header name,
4423 we reset the store before processing it; if the result is in fresh store, we
4424 use that without copying. This is helpful for expanding strings like
4425 $message_headers which can get very long.
4427 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4428 since resetting the store at the end of the expansion will free store that was
4429 allocated by the plugin code as well as the slop after the expanded string. So
4430 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4431 and, given the acl condition, ${if }. This is an unfortunate consequence of
4432 string expansion becoming too powerful.
4435 string the string to be expanded
4436 ket_ends true if expansion is to stop at }
4437 left if not NULL, a pointer to the first character after the
4438 expansion is placed here (typically used with ket_ends)
4439 skipping TRUE for recursive calls when the value isn't actually going
4440 to be used (to allow for optimisation)
4441 honour_dollar TRUE if $ is to be expanded,
4442 FALSE if it's just another character
4443 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4445 textonly_p if not NULL, pointer to flag - write bool for only-met-text
4447 Returns: NULL if expansion fails:
4448 expand_string_forcedfail is set TRUE if failure was forced
4449 expand_string_message contains a textual error message
4450 a pointer to the expanded string on success
4454 expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left,
4455 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p, BOOL * textonly_p)
4457 rmark reset_point = store_mark();
4458 gstring * yield = string_get(Ustrlen(string) + 64);
4460 const uschar * s = string;
4461 const uschar * save_expand_nstring[EXPAND_MAXN+1];
4462 int save_expand_nlength[EXPAND_MAXN+1];
4463 BOOL resetok = TRUE, first = TRUE, textonly = TRUE;
4466 f.expand_string_forcedfail = FALSE;
4467 expand_string_message = US"";
4469 if (is_tainted(string))
4471 expand_string_message =
4472 string_sprintf("attempt to expand tainted string '%s'", s);
4473 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
4484 debug_printf_indent("%c%s: %s\n",
4486 skipping ? "---scanning" : "considering", s);
4488 debug_printf_indent("%s%s: %s\n",
4489 first ? UTF8_DOWN_RIGHT : UTF8_VERT_RIGHT,
4491 ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning"
4497 /* \ escapes the next character, which must exist, or else
4498 the expansion fails. There's a special escape, \N, which causes
4499 copying of the subject verbatim up to the next \N. Otherwise,
4500 the escapes are the standard set. */
4506 expand_string_message = US"\\ at end of string";
4512 const uschar * t = s + 2;
4513 for (s = t; *s ; s++) if (*s == '\\' && s[1] == 'N') break;
4516 debug_expansion_interim(US"protected", t, (int)(s - t), skipping);
4517 yield = string_catn(yield, t, s - t);
4525 debug_printf_indent("|backslashed: '\\%c'\n", s[1]);
4527 debug_printf_indent(UTF8_VERT_RIGHT "backslashed: '\\%c'\n", s[1]);
4528 ch[0] = string_interpret_escape(&s);
4530 yield = string_catn(yield, ch, 1);
4536 /* Anything other than $ is just copied verbatim, unless we are
4537 looking for a terminating } character. */
4539 if (ket_ends && *s == '}') break;
4541 if (*s != '$' || !honour_dollar)
4544 for (const uschar * t = s+1;
4545 *t && *t != '$' && *t != '}' && *t != '\\'; t++) i++;
4547 DEBUG(D_expand) debug_expansion_interim(US"text", s, i, skipping);
4549 yield = string_catn(yield, s, i);
4555 /* No { after the $ - must be a plain name or a number for string
4556 match variable. There has to be a fudge for variables that are the
4557 names of header fields preceded by "$header_" because header field
4558 names can contain any printing characters except space and colon.
4559 For those that don't like typing this much, "$h_" is a synonym for
4560 "$header_". A non-existent header yields a NULL value; nothing is
4565 const uschar * value;
4566 int newsize = 0, len;
4570 s = read_name(name, sizeof(name), s, US"_");
4572 /* If this is the first thing to be expanded, release the pre-allocated
4576 g = store_get(sizeof(gstring), GET_UNTAINTED);
4577 else if (yield->ptr == 0)
4579 if (resetok) reset_point = store_reset(reset_point);
4581 reset_point = store_mark();
4582 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
4587 if ( ( *(t = name) == 'h'
4588 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4590 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4593 unsigned flags = *name == 'r' ? FH_WANT_RAW
4594 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4596 const uschar * charset = *name == 'b' ? NULL : headers_charset;
4598 s = read_header_name(name, sizeof(name), s);
4599 value = find_header(name, &newsize, flags, charset);
4601 /* If we didn't find the header, and the header contains a closing brace
4602 character, this may be a user error where the terminating colon
4603 has been omitted. Set a flag to adjust the error message in this case.
4604 But there is no error here - nothing gets inserted. */
4608 if (Ustrchr(name, '}')) malformed_header = TRUE;
4615 else if (!(value = find_variable(name, FALSE, skipping, &newsize)))
4617 expand_string_message =
4618 string_sprintf("unknown variable name \"%s\"", name);
4619 check_variable_error_message(name);
4623 /* If the data is known to be in a new buffer, newsize will be set to the
4624 size of that buffer. If this is the first thing in an expansion string,
4625 yield will be NULL; just point it at the new store instead of copying. Many
4626 expansion strings contain just one reference, so this is a useful
4627 optimization, especially for humungous headers. We need to use a gstring
4628 structure that is not allocated after that new-buffer, else a later store
4629 reset in the middle of the buffer will make it inaccessible. */
4631 len = Ustrlen(value);
4632 if (!yield && newsize != 0)
4635 yield->size = newsize;
4637 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
4640 yield = string_catn(yield, value, len);
4648 s = read_cnumber(&n, s);
4649 if (n >= 0 && n <= expand_nmax)
4650 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4654 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4656 if (*s != '{') /*}*/
4658 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4662 /* After { there can be various things, but they all start with
4663 an initial word, except for a number for a string match variable. */ /*}*/
4668 s = read_cnumber(&n, s); /*{{*/
4671 expand_string_message = US"} expected after number";
4674 if (n >= 0 && n <= expand_nmax)
4675 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4681 expand_string_message = US"letter or digit expected after ${"; /*}*/
4685 /* Allow "-" in names to cater for substrings with negative
4686 arguments. Since we are checking for known names after { this is
4689 s = read_name(name, sizeof(name), s, US"_-");
4690 item_type = chop_match(name, item_table, nelem(item_table));
4692 /* Switch on item type. All nondefault choices should "continue* when
4693 skipping, but "break" otherwise so we get debug output for the item
4696 int start = gstring_length(yield);
4699 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4700 If the ACL returns accept or reject we return content set by "message ="
4701 There is currently no limit on recursion; this would have us call
4702 acl_check_internal() directly and get a current level from somewhere.
4703 See also the acl expansion condition ECOND_ACL and the traditional
4704 acl modifier ACLC_ACL.
4705 Assume that the function has side-effects on the store that must be preserved.
4709 /* ${acl {name} {arg1}{arg2}...} */
4711 uschar * sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4715 switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, name,
4718 case 1: goto EXPAND_FAILED_CURLY;
4720 case 3: goto EXPAND_FAILED;
4722 if (skipping) continue;
4725 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4730 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4732 yield = string_cat(yield, user_msg);
4736 f.expand_string_forcedfail = TRUE;
4739 expand_string_message = string_sprintf("%s from acl \"%s\"",
4740 rc_names[rc], sub[0]);
4746 case EITEM_AUTHRESULTS:
4747 /* ${authresults {mysystemname}} */
4749 uschar * sub_arg[1];
4751 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4754 case 1: goto EXPAND_FAILED_CURLY;
4756 case 3: goto EXPAND_FAILED;
4759 yield = string_append(yield, 3,
4760 US"Authentication-Results: ", sub_arg[0], US"; none");
4763 yield = authres_local(yield, sub_arg[0]);
4764 yield = authres_iprev(yield);
4765 yield = authres_smtpauth(yield);
4767 yield = authres_spf(yield);
4769 #ifndef DISABLE_DKIM
4770 yield = authres_dkim(yield);
4772 #ifdef SUPPORT_DMARC
4773 yield = authres_dmarc(yield);
4775 #ifdef EXPERIMENTAL_ARC
4776 yield = authres_arc(yield);
4781 /* Handle conditionals - preserve the values of the numerical expansion
4782 variables in case they get changed by a regular expression match in the
4783 condition. If not, they retain their external settings. At the end
4784 of this "if" section, they get restored to their previous values. */
4789 const uschar *next_s;
4790 int save_expand_nmax =
4791 save_expand_strings(save_expand_nstring, save_expand_nlength);
4792 uschar * save_lookup_value = lookup_value;
4794 Uskip_whitespace(&s);
4795 if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond)))
4796 goto EXPAND_FAILED; /* message already set */
4800 debug_expansion_interim(US"condition", s, (int)(next_s - s), skipping);
4801 debug_expansion_interim(US"result",
4802 cond ? US"true" : US"false", cond ? 4 : 5, skipping);
4807 /* The handling of "yes" and "no" result strings is now in a separate
4808 function that is also used by ${lookup} and ${extract} and ${run}. */
4810 switch(process_yesno(
4811 skipping, /* were previously skipping */
4812 cond, /* success/failure indicator */
4813 lookup_value, /* value to reset for string2 */
4814 &s, /* input pointer */
4815 &yield, /* output pointer */
4816 US"if", /* condition type */
4819 case 1: goto EXPAND_FAILED; /* when all is well, the */
4820 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4823 /* Restore external setting of expansion variables for continuation
4826 lookup_value = save_lookup_value;
4827 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4828 save_expand_nlength);
4833 case EITEM_IMAPFOLDER:
4834 { /* ${imapfolder {name}{sep}{specials}} */
4838 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4841 case 1: goto EXPAND_FAILED_CURLY;
4843 case 3: goto EXPAND_FAILED;
4846 if (!sub_arg[1]) /* One argument */
4848 sub_arg[1] = US"/"; /* default separator */
4851 else if (Ustrlen(sub_arg[1]) != 1)
4853 expand_string_message =
4855 "IMAP folder separator must be one character, found \"%s\"",
4860 if (skipping) continue;
4862 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4863 sub_arg[1][0], sub_arg[2], &expand_string_message)))
4865 yield = string_cat(yield, encoded);
4870 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
4871 expanding an internal string that isn't actually going to be used. All we
4872 need to do is check the syntax, so don't do a lookup at all. Preserve the
4873 values of the numerical expansion variables in case they get changed by a
4874 partial lookup. If not, they retain their external settings. At the end
4875 of this "lookup" section, they get restored to their previous values. */
4879 int stype, partial, affixlen, starflags;
4880 int expand_setup = 0;
4882 uschar * key, * filename;
4883 const uschar * affix, * opts;
4884 uschar * save_lookup_value = lookup_value;
4885 int save_expand_nmax =
4886 save_expand_strings(save_expand_nstring, save_expand_nlength);
4888 if (expand_forbid & RDO_LOOKUP)
4890 expand_string_message = US"lookup expansions are not permitted";
4894 /* Get the key we are to look up for single-key+file style lookups.
4895 Otherwise set the key NULL pro-tem. */
4897 if (Uskip_whitespace(&s) == '{') /*}*/
4899 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL);
4900 if (!key) goto EXPAND_FAILED; /*{{*/
4903 expand_string_message = US"missing '}' after lookup key";
4904 goto EXPAND_FAILED_CURLY;
4906 Uskip_whitespace(&s);
4910 /* Find out the type of database */
4914 expand_string_message = US"missing lookup type";
4918 /* The type is a string that may contain special characters of various
4919 kinds. Allow everything except space or { to appear; the actual content
4920 is checked by search_findtype_partial. */ /*}*/
4922 while (*s && *s != '{' && !isspace(*s)) /*}*/
4924 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
4927 name[nameptr] = '\0';
4928 Uskip_whitespace(&s);
4930 /* Now check for the individual search type and any partial or default
4931 options. Only those types that are actually in the binary are valid. */
4933 if ((stype = search_findtype_partial(name, &partial, &affix, &affixlen,
4934 &starflags, &opts)) < 0)
4936 expand_string_message = search_error_message;
4940 /* Check that a key was provided for those lookup types that need it,
4941 and was not supplied for those that use the query style. */
4943 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
4947 expand_string_message = string_sprintf("missing {key} for single-"
4948 "key \"%s\" lookup", name);
4954 expand_string_message = string_sprintf("a single key was given for "
4955 "lookup type \"%s\", which is not a single-key lookup type", name);
4959 /* Get the next string in brackets and expand it. It is the file name for
4960 single-key+file lookups, and the whole query otherwise. In the case of
4961 queries that also require a file name (e.g. sqlite), the file name comes
4966 expand_string_message = US"missing '{' for lookup file-or-query arg";
4967 goto EXPAND_FAILED_CURLY; /*}}*/
4969 if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL)))
4974 expand_string_message = US"missing '}' closing lookup file-or-query arg";
4975 goto EXPAND_FAILED_CURLY;
4977 Uskip_whitespace(&s);
4979 /* If this isn't a single-key+file lookup, re-arrange the variables
4980 to be appropriate for the search_ functions. For query-style lookups,
4981 there is just a "key", and no file name. For the special query-style +
4982 file types, the query (i.e. "key") starts with a file name. */
4985 key = search_args(stype, name, filename, &filename, opts);
4987 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4988 the entry was not found. Note that there is no search_close() function.
4989 Files are left open in case of re-use. At suitable places in higher logic,
4990 search_tidyup() is called to tidy all open files. This can save opening
4991 the same file several times. However, files may also get closed when
4992 others are opened, if too many are open at once. The rule is that a
4993 handle should not be used after a second search_open().
4995 Request that a partial search sets up $1 and maybe $2 by passing
4996 expand_setup containing zero. If its value changes, reset expand_nmax,
4997 since new variables will have been set. Note that at the end of this
4998 "lookup" section, the old numeric variables are restored. */
5001 lookup_value = NULL;
5004 void * handle = search_open(filename, stype, 0, NULL, NULL);
5007 expand_string_message = search_error_message;
5010 lookup_value = search_find(handle, filename, key, partial, affix,
5011 affixlen, starflags, &expand_setup, opts);
5012 if (f.search_find_defer)
5014 expand_string_message =
5015 string_sprintf("lookup of \"%s\" gave DEFER: %s",
5016 string_printing2(key, SP_TAB), search_error_message);
5019 if (expand_setup > 0) expand_nmax = expand_setup;
5022 /* The handling of "yes" and "no" result strings is now in a separate
5023 function that is also used by ${if} and ${extract}. */
5025 switch(process_yesno(
5026 skipping, /* were previously skipping */
5027 lookup_value != NULL, /* success/failure indicator */
5028 save_lookup_value, /* value to reset for string2 */
5029 &s, /* input pointer */
5030 &yield, /* output pointer */
5031 US"lookup", /* condition type */
5034 case 1: goto EXPAND_FAILED; /* when all is well, the */
5035 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5038 /* Restore external setting of expansion variables for carrying on
5039 at this level, and continue. */
5041 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5042 save_expand_nlength);
5044 if (skipping) continue;
5048 /* If Perl support is configured, handle calling embedded perl subroutines,
5049 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
5050 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
5051 arguments (defined below). */
5053 #define EXIM_PERL_MAX_ARGS 8
5057 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
5058 "is not included in this binary";
5061 #else /* EXIM_PERL */
5063 uschar * sub_arg[EXIM_PERL_MAX_ARGS + 2];
5064 gstring * new_yield;
5066 if (expand_forbid & RDO_PERL)
5068 expand_string_message = US"Perl calls are not permitted";
5072 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
5073 name, &resetok, NULL))
5075 case 1: goto EXPAND_FAILED_CURLY;
5077 case 3: goto EXPAND_FAILED;
5080 /* If skipping, we don't actually do anything */
5082 if (skipping) continue;
5084 /* Start the interpreter if necessary */
5086 if (!opt_perl_started)
5089 if (!opt_perl_startup)
5091 expand_string_message = US"A setting of perl_startup is needed when "
5092 "using the Perl interpreter";
5095 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
5096 if ((initerror = init_perl(opt_perl_startup)))
5098 expand_string_message =
5099 string_sprintf("error in perl_startup code: %s\n", initerror);
5102 opt_perl_started = TRUE;
5105 /* Call the function */
5107 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
5108 new_yield = call_perl_cat(yield, &expand_string_message,
5109 sub_arg[0], sub_arg + 1);
5111 /* NULL yield indicates failure; if the message pointer has been set to
5112 NULL, the yield was undef, indicating a forced failure. Otherwise the
5113 message will indicate some kind of Perl error. */
5117 if (!expand_string_message)
5119 expand_string_message =
5120 string_sprintf("Perl subroutine \"%s\" returned undef to force "
5121 "failure", sub_arg[0]);
5122 f.expand_string_forcedfail = TRUE;
5127 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
5128 set during a callback from Perl. */
5130 f.expand_string_forcedfail = FALSE;
5134 #endif /* EXIM_PERL */
5136 /* Transform email address to "prvs" scheme to use
5137 as BATV-signed return path */
5141 uschar * sub_arg[3], * p, * domain;
5143 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, name, &resetok, NULL))
5145 case 1: goto EXPAND_FAILED_CURLY;
5147 case 3: goto EXPAND_FAILED;
5150 /* If skipping, we don't actually do anything */
5151 if (skipping) continue;
5153 /* sub_arg[0] is the address */
5154 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5155 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5157 expand_string_message = US"prvs first argument must be a qualified email address";
5161 /* Calculate the hash. The third argument must be a single-digit
5162 key number, or unset. */
5165 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5167 expand_string_message = US"prvs third argument must be a single digit";
5171 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5174 expand_string_message = US"prvs hmac-sha1 conversion failed";
5178 /* Now separate the domain from the local part */
5181 yield = string_catn(yield, US"prvs=", 5);
5182 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5183 yield = string_catn(yield, prvs_daystamp(7), 3);
5184 yield = string_catn(yield, p, 6);
5185 yield = string_catn(yield, US"=", 1);
5186 yield = string_cat (yield, sub_arg[0]);
5187 yield = string_catn(yield, US"@", 1);
5188 yield = string_cat (yield, domain);
5193 /* Check a prvs-encoded address for validity */
5195 case EITEM_PRVSCHECK:
5197 uschar * sub_arg[3], * p;
5199 const pcre2_code * re;
5201 /* TF: Ugliness: We want to expand parameter 1 first, then set
5202 up expansion variables that are used in the expansion of
5203 parameter 2. So we clone the string for the first
5204 expansion, where we only expand parameter 1.
5206 PH: Actually, that isn't necessary. The read_subs() function is
5207 designed to work this way for the ${if and ${lookup expansions. I've
5211 /* Reset expansion variables */
5212 prvscheck_result = NULL;
5213 prvscheck_address = NULL;
5214 prvscheck_keynum = NULL;
5216 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok, NULL))
5218 case 1: goto EXPAND_FAILED_CURLY;
5220 case 3: goto EXPAND_FAILED;
5223 re = regex_must_compile(
5224 US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5225 MCS_CASELESS | MCS_CACHEABLE, FALSE);
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]);
5237 debug_printf_indent("prvscheck localpart: %s\n", local_part);
5238 debug_printf_indent("prvscheck key number: %s\n", key_num);
5239 debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5240 debug_printf_indent("prvscheck hash: %s\n", hash);
5241 debug_printf_indent("prvscheck domain: %s\n", domain);
5244 /* Set up expansion variables */
5245 g = string_cat (NULL, local_part);
5246 g = string_catn(g, US"@", 1);
5247 g = string_cat (g, domain);
5248 prvscheck_address = string_from_gstring(g);
5249 prvscheck_keynum = string_copy(key_num);
5251 /* Now expand the second argument */
5252 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok, NULL))
5254 case 1: goto EXPAND_FAILED_CURLY;
5256 case 3: goto EXPAND_FAILED;
5259 /* Now we have the key and can check the address. */
5261 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5265 expand_string_message = US"hmac-sha1 conversion failed";
5269 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5270 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5272 if (Ustrcmp(p,hash) == 0)
5274 /* Success, valid BATV address. Now check the expiry date. */
5275 uschar *now = prvs_daystamp(0);
5276 unsigned int inow = 0,iexpire = 1;
5278 (void)sscanf(CS now,"%u",&inow);
5279 (void)sscanf(CS daystamp,"%u",&iexpire);
5281 /* When "iexpire" is < 7, a "flip" has occurred.
5282 Adjust "inow" accordingly. */
5283 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5285 if (iexpire >= inow)
5287 prvscheck_result = US"1";
5288 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n");
5292 prvscheck_result = NULL;
5293 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n");
5298 prvscheck_result = NULL;
5299 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n");
5302 /* Now expand the final argument. We leave this till now so that
5303 it can include $prvscheck_result. */
5305 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, name, &resetok, NULL))
5307 case 1: goto EXPAND_FAILED_CURLY;
5309 case 3: goto EXPAND_FAILED;
5312 yield = string_cat(yield,
5313 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5315 /* Reset the "internal" variables afterwards, because they are in
5316 dynamic store that will be reclaimed if the expansion succeeded. */
5318 prvscheck_address = NULL;
5319 prvscheck_keynum = NULL;
5322 /* Does not look like a prvs encoded address, return the empty string.
5323 We need to make sure all subs are expanded first, so as to skip over
5326 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok, NULL))
5328 case 1: goto EXPAND_FAILED_CURLY;
5330 case 3: goto EXPAND_FAILED;
5333 if (skipping) continue;
5337 /* Handle "readfile" to insert an entire file */
5339 case EITEM_READFILE:
5342 uschar * sub_arg[2];
5344 if ((expand_forbid & RDO_READFILE) != 0)
5346 expand_string_message = US"file insertions are not permitted";
5350 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok, NULL))
5352 case 1: goto EXPAND_FAILED_CURLY;
5354 case 3: goto EXPAND_FAILED;
5357 /* If skipping, we don't actually do anything */
5359 if (skipping) continue;
5361 /* Open the file and read it */
5363 if (!(f = Ufopen(sub_arg[0], "rb")))
5365 expand_string_message = string_open_failed("%s", sub_arg[0]);
5369 yield = cat_file(f, yield, sub_arg[1]);
5374 /* Handle "readsocket" to insert data from a socket, either
5375 Inet or Unix domain */
5377 case EITEM_READSOCK:
5380 uschar * sub_arg[4];
5382 if (expand_forbid & RDO_READSOCK)
5384 expand_string_message = US"socket insertions are not permitted";
5388 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5389 because there may be a string for expansion on failure. */
5391 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, name, &resetok, NULL))
5393 case 1: goto EXPAND_FAILED_CURLY;
5394 case 2: /* Won't occur: no end check */
5395 case 3: goto EXPAND_FAILED;
5398 /* If skipping, we don't actually do anything. Otherwise, arrange to
5399 connect to either an IP or a Unix socket. */
5403 int stype = search_findtype(US"readsock", 8);
5406 int expand_setup = -1;
5409 /* If the reqstr is empty, flag that and set a dummy */
5413 g = string_append_listele(g, ',', US"send=no");
5414 sub_arg[1] = US"DUMMY";
5417 /* Re-marshall the options */
5421 const uschar * list = sub_arg[2];
5425 /* First option has no tag and is timeout */
5426 if ((item = string_nextinlist(&list, &sep, NULL, 0)))
5427 g = string_append_listele(g, ',',
5428 string_sprintf("timeout=%s", item));
5430 /* The rest of the options from the expansion */
5431 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5432 g = string_append_listele(g, ',', item);
5434 /* possibly plus an EOL string. Process with escapes, to protect
5435 from list-processing. The only current user of eol= in search
5436 options is the readsock expansion. */
5438 if (sub_arg[3] && *sub_arg[3])
5439 g = string_append_listele(g, ',',
5440 string_sprintf("eol=%s",
5441 string_printing2(sub_arg[3], SP_TAB|SP_SPACE)));
5444 /* Gat a (possibly cached) handle for the connection */
5446 if (!(handle = search_open(sub_arg[0], stype, 0, NULL, NULL)))
5448 if (*expand_string_message) goto EXPAND_FAILED;
5449 expand_string_message = search_error_message;
5450 search_error_message = NULL;
5454 /* Get (possibly cached) results for the lookup */
5455 /* sspec: sub_arg[0] req: sub_arg[1] opts: g */
5457 if ((s = search_find(handle, sub_arg[0], sub_arg[1], -1, NULL, 0, 0,
5458 &expand_setup, string_from_gstring(g))))
5459 yield = string_cat(yield, s);
5460 else if (f.search_find_defer)
5462 expand_string_message = search_error_message;
5463 search_error_message = NULL;
5467 { /* should not happen, at present */
5468 expand_string_message = search_error_message;
5469 search_error_message = NULL;
5474 /* The whole thing has worked (or we were skipping). If there is a
5475 failure string following, we need to skip it. */
5477 if (*s == '{') /*}*/
5479 if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok, NULL))
5480 goto EXPAND_FAILED; /*{*/
5483 expand_string_message = US"missing '}' closing failstring for readsocket";
5484 goto EXPAND_FAILED_CURLY;
5486 Uskip_whitespace(&s);
5489 READSOCK_DONE: /*{*/
5492 expand_string_message = US"missing '}' closing readsocket";
5493 goto EXPAND_FAILED_CURLY;
5495 if (skipping) continue;
5498 /* Come here on failure to create socket, connect socket, write to the
5499 socket, or timeout on reading. If another substring follows, expand and
5500 use it. Otherwise, those conditions give expand errors. */
5503 if (*s != '{') goto EXPAND_FAILED; /*}*/
5504 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5505 if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok, NULL)))
5507 yield = string_cat(yield, arg); /*{*/
5510 expand_string_message = US"missing '}' closing failstring for readsocket";
5511 goto EXPAND_FAILED_CURLY;
5513 Uskip_whitespace(&s);
5517 /* Handle "run" to execute a program. */
5522 const uschar * arg, ** argv;
5523 BOOL late_expand = TRUE;
5525 if ((expand_forbid & RDO_RUN) != 0)
5527 expand_string_message = US"running a command is not permitted";
5531 /* Handle options to the "run" */
5535 if (Ustrncmp(++s, "preexpand", 9) == 0)
5536 { late_expand = FALSE; s += 9; }
5539 const uschar * t = s;
5540 while (isalpha(*++t)) ;
5541 expand_string_message = string_sprintf("bad option '%.*s' for run",
5546 Uskip_whitespace(&s);
5548 if (*s != '{') /*}*/
5550 expand_string_message = US"missing '{' for command arg of run";
5551 goto EXPAND_FAILED_CURLY; /*"}*/
5555 if (late_expand) /* this is the default case */
5557 int n = Ustrcspn(s, "}");
5558 arg = skipping ? NULL : string_copyn(s, n);
5563 if (!(arg = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok, NULL)))
5565 Uskip_whitespace(&s);
5570 expand_string_message = US"missing '}' closing command arg of run";
5571 goto EXPAND_FAILED_CURLY;
5574 if (skipping) /* Just pretend it worked when we're skipping */
5577 lookup_value = NULL;
5584 if (!transport_set_up_command(&argv, /* anchor for arg list */
5585 arg, /* raw command */
5586 late_expand, /* expand args if not already done */
5587 0, /* not relevant when... */
5588 NULL, /* no transporting address */
5589 late_expand, /* allow tainted args, when expand-after-split */
5590 US"${run} expansion", /* for error messages */
5591 &expand_string_message)) /* where to put error message */
5594 /* Create the child process, making it a group leader. */
5596 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5597 US"expand-run")) < 0)
5599 expand_string_message =
5600 string_sprintf("couldn't create child process: %s", strerror(errno));
5604 /* Nothing is written to the standard input. */
5608 /* Read the pipe to get the command's output into $value (which is kept
5609 in lookup_value). Read during execution, so that if the output exceeds
5610 the OS pipe buffer limit, we don't block forever. Remember to not release
5611 memory just allocated for $value. */
5614 f = fdopen(fd_out, "rb");
5615 sigalrm_seen = FALSE;
5617 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5621 /* Wait for the process to finish, applying the timeout, and inspect its
5622 return code for serious disasters. Simple non-zero returns are passed on.
5625 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5627 if (sigalrm_seen || runrc == -256)
5629 expand_string_message = US"command timed out";
5630 killpg(pid, SIGKILL); /* Kill the whole process group */
5633 else if (runrc == -257)
5634 expand_string_message = string_sprintf("wait() failed: %s",
5638 expand_string_message = string_sprintf("command killed by signal %d",
5645 /* Process the yes/no strings; $value may be useful in both cases */
5647 switch(process_yesno(
5648 skipping, /* were previously skipping */
5649 runrc == 0, /* success/failure indicator */
5650 lookup_value, /* value to reset for string2 */
5651 &s, /* input pointer */
5652 &yield, /* output pointer */
5653 US"run", /* condition type */
5656 case 1: goto EXPAND_FAILED; /* when all is well, the */
5657 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5660 if (skipping) continue;
5664 /* Handle character translation for "tr" */
5668 int oldptr = gstring_length(yield);
5672 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok, NULL))
5674 case 1: goto EXPAND_FAILED_CURLY;
5676 case 3: goto EXPAND_FAILED;
5679 yield = string_cat(yield, sub[0]);
5680 o2m = Ustrlen(sub[2]) - 1;
5682 if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++)
5684 uschar *m = Ustrrchr(sub[1], yield->s[oldptr]);
5688 yield->s[oldptr] = sub[2][(o < o2m)? o : o2m];
5692 if (skipping) continue;
5696 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5697 expanded arguments. */
5706 int val[2] = { 0, -1 };
5709 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5710 Ensure that sub[2] is set in the ${length } case. */
5713 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
5714 TRUE, name, &resetok, NULL))
5716 case 1: goto EXPAND_FAILED_CURLY;
5718 case 3: goto EXPAND_FAILED;
5721 /* Juggle the arguments if there are only two of them: always move the
5722 string to the last position and make ${length{n}{str}} equivalent to
5723 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5729 if (item_type == EITEM_LENGTH)
5736 for (int i = 0; i < 2; i++) if (sub[i])
5738 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5739 if (*ret != 0 || (i != 0 && val[i] < 0))
5741 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5742 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5748 item_type == EITEM_HASH
5749 ? compute_hash(sub[2], val[0], val[1], &len)
5750 : item_type == EITEM_NHASH
5751 ? compute_nhash(sub[2], val[0], val[1], &len)
5752 : extract_substr(sub[2], val[0], val[1], &len);
5755 yield = string_catn(yield, ret, len);
5756 if (skipping) continue;
5760 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5761 This code originally contributed by Steve Haslam. It currently supports
5762 the use of MD5 and SHA-1 hashes.
5764 We need some workspace that is large enough to handle all the supported
5765 hash types. Use macros to set the sizes rather than be too elaborate. */
5767 #define MAX_HASHLEN 20
5768 #define MAX_HASHBLOCKLEN 64
5777 int hashlen; /* Number of octets for the hash algorithm's output */
5778 int hashblocklen; /* Number of octets the hash algorithm processes */
5779 uschar * keyptr, * p;
5780 unsigned int keylen;
5782 uschar keyhash[MAX_HASHLEN];
5783 uschar innerhash[MAX_HASHLEN];
5784 uschar finalhash[MAX_HASHLEN];
5785 uschar finalhash_hex[2*MAX_HASHLEN];
5786 uschar innerkey[MAX_HASHBLOCKLEN];
5787 uschar outerkey[MAX_HASHBLOCKLEN];
5789 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok, NULL))
5791 case 1: goto EXPAND_FAILED_CURLY;
5793 case 3: goto EXPAND_FAILED;
5796 if (skipping) continue;
5798 if (Ustrcmp(sub[0], "md5") == 0)
5801 use_base = &md5_base;
5805 else if (Ustrcmp(sub[0], "sha1") == 0)
5808 use_base = &sha1_ctx;
5814 expand_string_message =
5815 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5820 keylen = Ustrlen(keyptr);
5822 /* If the key is longer than the hash block length, then hash the key
5825 if (keylen > hashblocklen)
5827 chash_start(type, use_base);
5828 chash_end(type, use_base, keyptr, keylen, keyhash);
5833 /* Now make the inner and outer key values */
5835 memset(innerkey, 0x36, hashblocklen);
5836 memset(outerkey, 0x5c, hashblocklen);
5838 for (int i = 0; i < keylen; i++)
5840 innerkey[i] ^= keyptr[i];
5841 outerkey[i] ^= keyptr[i];
5844 /* Now do the hashes */
5846 chash_start(type, use_base);
5847 chash_mid(type, use_base, innerkey);
5848 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5850 chash_start(type, use_base);
5851 chash_mid(type, use_base, outerkey);
5852 chash_end(type, use_base, innerhash, hashlen, finalhash);
5854 /* Encode the final hash as a hex string */
5857 for (int i = 0; i < hashlen; i++)
5859 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5860 *p++ = hex_digits[finalhash[i] & 0x0f];
5863 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5864 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5866 yield = string_catn(yield, finalhash_hex, hashlen*2);
5870 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5871 We have to save the numerical variables and restore them afterwards. */
5875 const pcre2_code * re;
5876 int moffset, moffsetextra, slen;
5877 pcre2_match_data * md;
5879 uschar * subject, * sub[3];
5880 int save_expand_nmax =
5881 save_expand_strings(save_expand_nstring, save_expand_nlength);
5882 unsigned sub_textonly = 0;
5884 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok, &sub_textonly))
5886 case 1: goto EXPAND_FAILED_CURLY;
5888 case 3: goto EXPAND_FAILED;
5890 if (skipping) continue;
5892 /* Compile the regular expression */
5894 re = regex_compile(sub[1],
5895 sub_textonly & BIT(1) ? MCS_CACHEABLE : MCS_NOFLAGS,
5896 &expand_string_message, pcre_gen_cmp_ctx);
5900 md = pcre2_match_data_create(EXPAND_MAXN + 1, pcre_gen_ctx);
5902 /* Now run a loop to do the substitutions as often as necessary. It ends
5903 when there are no more matches. Take care over matches of the null string;
5904 do the same thing as Perl does. */
5907 slen = Ustrlen(sub[0]);
5908 moffset = moffsetextra = 0;
5913 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
5914 int n = pcre2_match(re, (PCRE2_SPTR)subject, slen, moffset + moffsetextra,
5915 PCRE_EOPT | emptyopt, md, pcre_gen_mtc_ctx);
5918 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5919 is not necessarily the end. We want to repeat the match from one
5920 character further along, but leaving the basic offset the same (for
5921 copying below). We can't be at the end of the string - that was checked
5922 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5923 finished; copy the remaining string and end the loop. */
5933 yield = string_catn(yield, subject+moffset, slen-moffset);
5937 /* Match - set up for expanding the replacement. */
5938 DEBUG(D_expand) debug_printf_indent("%s: match\n", name);
5940 if (n == 0) n = EXPAND_MAXN + 1;
5942 for (int nn = 0; nn < n*2; nn += 2)
5944 expand_nstring[expand_nmax] = subject + ovec[nn];
5945 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
5949 /* Copy the characters before the match, plus the expanded insertion. */
5951 yield = string_catn(yield, subject + moffset, ovec[0] - moffset);
5953 if (!(insert = expand_string(sub[2])))
5955 yield = string_cat(yield, insert);
5961 /* If we have matched an empty string, first check to see if we are at
5962 the end of the subject. If so, the loop is over. Otherwise, mimic
5963 what Perl's /g options does. This turns out to be rather cunning. First
5964 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5965 string at the same point. If this fails (picked up above) we advance to
5966 the next character. */
5968 if (ovec[0] == ovec[1])
5970 if (ovec[0] == slen) break;
5971 emptyopt = PCRE2_NOTEMPTY | PCRE2_ANCHORED;
5975 /* All done - restore numerical variables. */
5977 /* pcre2_match_data_free(md); gen ctx needs no free */
5978 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5979 save_expand_nlength);
5983 /* Handle keyed and numbered substring extraction. If the first argument
5984 consists entirely of digits, then a numerical extraction is assumed. */
5988 int field_number = 1;
5989 BOOL field_number_set = FALSE;
5990 uschar * save_lookup_value = lookup_value, * sub[3];
5991 int save_expand_nmax =
5992 save_expand_strings(save_expand_nstring, save_expand_nlength);
5994 /* On reflection the original behaviour of extract-json for a string
5995 result, leaving it quoted, was a mistake. But it was already published,
5996 hence the addition of jsons. In a future major version, make json
5997 work like josons, and withdraw jsons. */
5999 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
6001 /* Check for a format-variant specifier */
6003 if (Uskip_whitespace(&s) != '{') /*}*/
6004 if (Ustrncmp(s, "json", 4) == 0)
6005 if (*(s += 4) == 's')
6006 {fmt = extract_jsons; s++;}
6010 /* While skipping we cannot rely on the data for expansions being
6011 available (eg. $item) hence cannot decide on numeric vs. keyed.
6012 Read a maximum of 5 arguments (including the yes/no) */
6016 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
6018 if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL))
6019 goto EXPAND_FAILED; /*'{'*/
6022 expand_string_message = US"missing '{' for arg of extract";
6023 goto EXPAND_FAILED_CURLY;
6025 Uskip_whitespace(&s);
6027 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
6028 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
6032 Uskip_whitespace(&s);
6036 expand_string_message = US"missing '}' closing extract";
6037 goto EXPAND_FAILED_CURLY;
6041 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6043 if (Uskip_whitespace(&s) == '{') /*'}'*/
6045 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL)))
6046 goto EXPAND_FAILED; /*'{'*/
6049 expand_string_message = string_sprintf(
6050 "missing '}' closing arg %d of extract", i+1);
6051 goto EXPAND_FAILED_CURLY;
6054 /* After removal of leading and trailing white space, the first
6055 argument must not be empty; if it consists entirely of digits
6056 (optionally preceded by a minus sign), this is a numerical
6057 extraction, and we expect 3 arguments (normal) or 2 (json). */
6063 uschar * p = sub[0];
6065 Uskip_whitespace(&p);
6069 while (len > 0 && isspace(p[len-1])) len--;
6074 expand_string_message = US"first argument of \"extract\" must "
6084 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6088 if (fmt == extract_basic) j = 3; /* Need 3 args */
6089 field_number_set = TRUE;
6095 expand_string_message = string_sprintf(
6096 "missing '{' for arg %d of extract", i+1);
6097 goto EXPAND_FAILED_CURLY;
6101 /* Extract either the numbered or the keyed substring into $value. If
6102 skipping, just pretend the extraction failed. */
6105 lookup_value = NULL;
6109 lookup_value = field_number_set
6110 ? expand_gettokened(field_number, sub[1], sub[2])
6111 : expand_getkeyed(sub[0], sub[1]);
6118 const uschar * list;
6120 /* Array: Bracket-enclosed and comma-separated.
6121 Object: Brace-enclosed, comma-sep list of name:value pairs */
6123 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6125 expand_string_message =
6126 string_sprintf("%s wrapping %s for extract json",
6127 expand_string_message,
6128 field_number_set ? "array" : "object");
6129 goto EXPAND_FAILED_CURLY;
6133 if (field_number_set)
6135 if (field_number <= 0)
6137 expand_string_message = US"first argument of \"extract\" must "
6138 "be greater than zero";
6141 while (field_number > 0 && (item = json_nextinlist(&list)))
6143 if ((lookup_value = s = item))
6146 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6151 lookup_value = NULL;
6152 while ((item = json_nextinlist(&list)))
6154 /* Item is: string name-sep value. string is quoted.
6155 Dequote the string and compare with the search key. */
6157 if (!(item = dewrap(item, US"\"\"")))
6159 expand_string_message =
6160 string_sprintf("%s wrapping string key for extract json",
6161 expand_string_message);
6162 goto EXPAND_FAILED_CURLY;
6164 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6166 s = item + Ustrlen(item) + 1;
6167 if (Uskip_whitespace(&s) != ':')
6169 expand_string_message =
6170 US"missing object value-separator for extract json";
6171 goto EXPAND_FAILED_CURLY;
6174 Uskip_whitespace(&s);
6182 if ( fmt == extract_jsons
6184 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6186 expand_string_message =
6187 string_sprintf("%s wrapping string result for extract jsons",
6188 expand_string_message);
6189 goto EXPAND_FAILED_CURLY;
6194 /* If no string follows, $value gets substituted; otherwise there can
6195 be yes/no strings, as for lookup or if. */
6197 switch(process_yesno(
6198 skipping, /* were previously skipping */
6199 lookup_value != NULL, /* success/failure indicator */
6200 save_lookup_value, /* value to reset for string2 */
6201 &s, /* input pointer */
6202 &yield, /* output pointer */
6203 US"extract", /* condition type */
6206 case 1: goto EXPAND_FAILED; /* when all is well, the */
6207 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6210 /* All done - restore numerical variables. */
6212 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6213 save_expand_nlength);
6215 if (skipping) continue;
6219 /* return the Nth item from a list */
6221 case EITEM_LISTEXTRACT:
6223 int field_number = 1;
6224 uschar * save_lookup_value = lookup_value, * sub[2];
6225 int save_expand_nmax =
6226 save_expand_strings(save_expand_nstring, save_expand_nlength);
6228 /* Read the field & list arguments */
6230 for (int i = 0; i < 2; i++)
6232 if (Uskip_whitespace(&s) != '{') /*}*/
6234 expand_string_message = string_sprintf(
6235 "missing '{' for arg %d of listextract", i+1); /*}*/
6236 goto EXPAND_FAILED_CURLY;
6239 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL);
6240 if (!sub[i]) goto EXPAND_FAILED; /*{{*/
6243 expand_string_message = string_sprintf(
6244 "missing '}' closing arg %d of listextract", i+1);
6245 goto EXPAND_FAILED_CURLY;
6248 /* After removal of leading and trailing white space, the first
6249 argument must be numeric and nonempty. */
6257 Uskip_whitespace(&p);
6261 while (len > 0 && isspace(p[len-1])) len--;
6264 if (!*p && !skipping)
6266 expand_string_message = US"first argument of \"listextract\" must "
6276 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6279 expand_string_message = US"first argument of \"listextract\" must "
6287 /* Extract the numbered element into $value. If
6288 skipping, just pretend the extraction failed. */
6290 lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]);
6292 /* If no string follows, $value gets substituted; otherwise there can
6293 be yes/no strings, as for lookup or if. */
6295 switch(process_yesno(
6296 skipping, /* were previously skipping */
6297 lookup_value != NULL, /* success/failure indicator */
6298 save_lookup_value, /* value to reset for string2 */
6299 &s, /* input pointer */
6300 &yield, /* output pointer */
6301 US"listextract", /* condition type */
6304 case 1: goto EXPAND_FAILED; /* when all is well, the */
6305 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6308 /* All done - restore numerical variables. */
6310 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6311 save_expand_nlength);
6313 if (skipping) continue;
6317 case EITEM_LISTQUOTE:
6320 switch(read_subs(sub, 2, 2, &s, skipping, TRUE, name, &resetok, NULL))
6322 case 1: goto EXPAND_FAILED_CURLY;
6324 case 3: goto EXPAND_FAILED;
6326 if (*sub[1]) for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6328 if (c == sep) yield = string_catn(yield, sub[1], 1);
6329 yield = string_catn(yield, sub[1], 1);
6331 else yield = string_catn(yield, US" ", 1);
6332 if (skipping) continue;
6337 case EITEM_CERTEXTRACT:
6339 uschar * save_lookup_value = lookup_value, * sub[2];
6340 int save_expand_nmax =
6341 save_expand_strings(save_expand_nstring, save_expand_nlength);
6343 /* Read the field argument */
6344 if (Uskip_whitespace(&s) != '{') /*}*/
6346 expand_string_message = US"missing '{' for field arg of certextract";
6347 goto EXPAND_FAILED_CURLY; /*}*/
6349 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL);
6350 if (!sub[0]) goto EXPAND_FAILED; /*{{*/
6353 expand_string_message = US"missing '}' closing field arg of certextract";
6354 goto EXPAND_FAILED_CURLY;
6356 /* strip spaces fore & aft */
6361 Uskip_whitespace(&p);
6365 while (len > 0 && isspace(p[len-1])) len--;
6369 /* inspect the cert argument */
6370 if (Uskip_whitespace(&s) != '{') /*}*/
6372 expand_string_message = US"missing '{' for cert variable arg of certextract";
6373 goto EXPAND_FAILED_CURLY; /*}*/
6377 expand_string_message = US"second argument of \"certextract\" must "
6378 "be a certificate variable";
6381 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok, NULL);
6382 if (!sub[1]) goto EXPAND_FAILED; /*{{*/
6385 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6386 goto EXPAND_FAILED_CURLY;
6390 lookup_value = NULL;
6393 lookup_value = expand_getcertele(sub[0], sub[1]);
6394 if (*expand_string_message) goto EXPAND_FAILED;
6396 switch(process_yesno(
6397 skipping, /* were previously skipping */
6398 lookup_value != NULL, /* success/failure indicator */
6399 save_lookup_value, /* value to reset for string2 */
6400 &s, /* input pointer */
6401 &yield, /* output pointer */
6402 US"certextract", /* condition type */
6405 case 1: goto EXPAND_FAILED; /* when all is well, the */
6406 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6409 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6410 save_expand_nlength);
6411 if (skipping) continue;
6414 #endif /*DISABLE_TLS*/
6416 /* Handle list operations */
6422 int sep = 0, save_ptr = gstring_length(yield);
6423 uschar outsep[2] = { '\0', '\0' };
6424 const uschar *list, *expr, *temp;
6425 uschar * save_iterate_item = iterate_item;
6426 uschar * save_lookup_value = lookup_value;
6428 Uskip_whitespace(&s);
6429 if (*s++ != '{') /*}*/
6431 expand_string_message =
6432 string_sprintf("missing '{' for first arg of %s", name);
6433 goto EXPAND_FAILED_CURLY; /*}*/
6436 if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok, NULL)))
6437 goto EXPAND_FAILED; /*{{*/
6440 expand_string_message =
6441 string_sprintf("missing '}' closing first arg of %s", name);
6442 goto EXPAND_FAILED_CURLY;
6445 if (item_type == EITEM_REDUCE)
6448 Uskip_whitespace(&s);
6449 if (*s++ != '{') /*}*/
6451 expand_string_message = US"missing '{' for second arg of reduce";
6452 goto EXPAND_FAILED_CURLY; /*}*/
6454 t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok, NULL);
6455 if (!t) goto EXPAND_FAILED;
6456 lookup_value = t; /*{{*/
6459 expand_string_message = US"missing '}' closing second arg of reduce";
6460 goto EXPAND_FAILED_CURLY;
6464 Uskip_whitespace(&s);
6465 if (*s++ != '{') /*}*/
6467 expand_string_message =
6468 string_sprintf("missing '{' for last arg of %s", name); /*}*/
6469 goto EXPAND_FAILED_CURLY;
6474 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6475 if scanning a "false" part). This allows us to find the end of the
6476 condition, because if the list is empty, we won't actually evaluate the
6477 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6478 the normal internal expansion function. */
6480 if (item_type != EITEM_FILTER)
6481 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok, NULL);
6483 if ((temp = eval_condition(expr, &resetok, NULL))) s = temp;
6487 expand_string_message = string_sprintf("%s inside \"%s\" item",
6488 expand_string_message, name);
6492 Uskip_whitespace(&s); /*{{{*/
6495 expand_string_message = string_sprintf("missing } at end of condition "
6496 "or expression inside \"%s\"; could be an unquoted } in the content",
6501 Uskip_whitespace(&s); /*{{*/
6504 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6509 /* If we are skipping, we can now just move on to the next item. When
6510 processing for real, we perform the iteration. */
6512 if (skipping) continue;
6513 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6515 *outsep = (uschar)sep; /* Separator as a string */
6517 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6518 name, iterate_item, lookup_value);
6520 if (item_type == EITEM_FILTER)
6523 if (!eval_condition(expr, &resetok, &condresult))
6525 iterate_item = save_iterate_item;
6526 lookup_value = save_lookup_value;
6527 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6528 expand_string_message, name);
6531 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6532 condresult? "true":"false");
6534 temp = iterate_item; /* TRUE => include this item */
6536 continue; /* FALSE => skip this item */
6539 /* EITEM_MAP and EITEM_REDUCE */
6543 uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok, NULL);
6547 iterate_item = save_iterate_item;
6548 expand_string_message = string_sprintf("%s inside \"%s\" item",
6549 expand_string_message, name);
6552 if (item_type == EITEM_REDUCE)
6554 lookup_value = t; /* Update the value of $value */
6555 continue; /* and continue the iteration */
6559 /* We reach here for FILTER if the condition is true, always for MAP,
6560 and never for REDUCE. The value in "temp" is to be added to the output
6561 list that is being created, ensuring that any occurrences of the
6562 separator character are doubled. Unless we are dealing with the first
6563 item of the output list, add in a space if the new item begins with the
6564 separator character, or is an empty string. */
6566 /*XXX is there not a standard support function for this, appending to a list? */
6567 /* yes, string_append_listele(), but it depends on lack of text before the list */
6569 if ( yield && yield->ptr != save_ptr
6570 && (temp[0] == *outsep || temp[0] == 0))
6571 yield = string_catn(yield, US" ", 1);
6573 /* Add the string in "temp" to the output list that we are building,
6574 This is done in chunks by searching for the separator character. */
6578 size_t seglen = Ustrcspn(temp, outsep);
6580 yield = string_catn(yield, temp, seglen + 1);
6582 /* If we got to the end of the string we output one character
6583 too many; backup and end the loop. Otherwise arrange to double the
6586 if (!temp[seglen]) { yield->ptr--; break; }
6587 yield = string_catn(yield, outsep, 1);
6591 /* Output a separator after the string: we will remove the redundant
6592 final one at the end. */
6594 yield = string_catn(yield, outsep, 1);
6595 } /* End of iteration over the list loop */
6597 /* REDUCE has generated no output above: output the final value of
6600 if (item_type == EITEM_REDUCE)
6602 yield = string_cat(yield, lookup_value);
6603 lookup_value = save_lookup_value; /* Restore $value */
6606 /* FILTER and MAP generate lists: if they have generated anything, remove
6607 the redundant final separator. Even though an empty item at the end of a
6608 list does not count, this is tidier. */
6610 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6612 /* Restore preserved $item */
6614 iterate_item = save_iterate_item;
6615 if (skipping) continue;
6621 int sep = 0, cond_type;
6622 const uschar * srclist, * cmp, * xtract;
6623 uschar * opname, * srcitem;
6624 const uschar * dstlist = NULL, * dstkeylist = NULL;
6625 uschar * tmp, * save_iterate_item = iterate_item;
6627 Uskip_whitespace(&s);
6628 if (*s++ != '{') /*}*/
6630 expand_string_message = US"missing '{' for list arg of sort";
6631 goto EXPAND_FAILED_CURLY; /*}*/
6634 srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok, NULL);
6635 if (!srclist) goto EXPAND_FAILED; /*{{*/
6638 expand_string_message = US"missing '}' closing list arg of sort";
6639 goto EXPAND_FAILED_CURLY;
6642 Uskip_whitespace(&s);
6643 if (*s++ != '{') /*}*/
6645 expand_string_message = US"missing '{' for comparator arg of sort";
6646 goto EXPAND_FAILED_CURLY; /*}*/
6649 cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok, NULL);
6650 if (!cmp) goto EXPAND_FAILED; /*{{*/
6653 expand_string_message = US"missing '}' closing comparator arg of sort";
6654 goto EXPAND_FAILED_CURLY;
6657 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6659 if (!expand_string_message)
6660 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6665 case ECOND_NUM_L: case ECOND_NUM_LE:
6666 case ECOND_NUM_G: case ECOND_NUM_GE:
6667 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6668 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6672 expand_string_message = US"comparator not handled for sort";
6676 Uskip_whitespace(&s);
6677 if (*s++ != '{') /*}*/
6679 expand_string_message = US"missing '{' for extractor arg of sort";
6680 goto EXPAND_FAILED_CURLY; /*}*/
6684 if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok, NULL)))
6686 xtract = string_copyn(xtract, s - xtract);
6690 expand_string_message = US"missing '}' closing extractor arg of sort";
6691 goto EXPAND_FAILED_CURLY;
6696 expand_string_message = US"missing } at end of \"sort\"";
6700 if (skipping) continue;
6702 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6704 uschar * srcfield, * dstitem;
6705 gstring * newlist = NULL, * newkeylist = NULL;
6707 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6709 /* extract field for comparisons */
6710 iterate_item = srcitem;
6711 if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE,
6712 TRUE, &resetok, NULL))
6715 expand_string_message = string_sprintf(
6716 "field-extract in sort: \"%s\"", xtract);
6720 /* Insertion sort */
6722 /* copy output list until new-item < list-item */
6723 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6727 /* field for comparison */
6728 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6731 /* String-comparator names start with a letter; numeric names do not */
6733 if (sortsbefore(cond_type, isalpha(opname[0]),
6734 srcfield, dstfield))
6736 /* New-item sorts before this dst-item. Append new-item,
6737 then dst-item, then remainder of dst list. */
6739 newlist = string_append_listele(newlist, sep, srcitem);
6740 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6743 newlist = string_append_listele(newlist, sep, dstitem);
6744 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6746 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6747 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6749 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6751 newlist = string_append_listele(newlist, sep, dstitem);
6752 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6758 newlist = string_append_listele(newlist, sep, dstitem);
6759 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6762 /* If we ran out of dstlist without consuming srcitem, append it */
6765 newlist = string_append_listele(newlist, sep, srcitem);
6766 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6769 dstlist = newlist->s;
6770 dstkeylist = newkeylist->s;
6772 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6773 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6777 yield = string_cat(yield, dstlist);
6779 /* Restore preserved $item */
6780 iterate_item = save_iterate_item;
6784 expand_string_message = US"Internal error in sort (list mismatch)";
6789 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6790 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6791 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6792 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6794 #define EXPAND_DLFUNC_MAX_ARGS 8
6797 #ifndef EXPAND_DLFUNC
6798 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6799 "is not included in this binary";
6802 #else /* EXPAND_DLFUNC */
6805 exim_dlfunc_t * func;
6808 uschar * argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6810 if (expand_forbid & RDO_DLFUNC)
6812 expand_string_message =
6813 US"dynamically-loaded functions are not permitted";
6817 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
6818 TRUE, name, &resetok, NULL))
6820 case 1: goto EXPAND_FAILED_CURLY;
6822 case 3: goto EXPAND_FAILED;
6825 /* If skipping, we don't actually do anything */
6827 if (skipping) continue;
6829 /* Look up the dynamically loaded object handle in the tree. If it isn't
6830 found, dlopen() the file and put the handle in the tree for next time. */
6832 if (!(t = tree_search(dlobj_anchor, argv[0])))
6834 void * handle = dlopen(CS argv[0], RTLD_LAZY);
6837 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6838 argv[0], dlerror());
6839 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6842 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), argv[0]);
6843 Ustrcpy(t->name, argv[0]);
6844 t->data.ptr = handle;
6845 (void)tree_insertnode(&dlobj_anchor, t);
6848 /* Having obtained the dynamically loaded object handle, look up the
6849 function pointer. */
6851 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
6853 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6854 "%s", argv[1], argv[0], dlerror());
6855 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6859 /* Call the function and work out what to do with the result. If it
6860 returns OK, we have a replacement string; if it returns DEFER then
6861 expansion has failed in a non-forced manner; if it returns FAIL then
6862 failure was forced; if it returns ERROR or any other value there's a
6863 problem, so panic slightly. In any case, assume that the function has
6864 side-effects on the store that must be preserved. */
6868 for (argc = 0; argv[argc]; argc++) ;
6870 if ((status = func(&result, argc - 2, &argv[2])) != OK)
6872 expand_string_message = result ? result : US"(no message)";
6873 if (status == FAIL_FORCED)
6874 f.expand_string_forcedfail = TRUE;
6875 else if (status != FAIL)
6876 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
6877 argv[0], argv[1], status, expand_string_message);
6881 if (result) yield = string_cat(yield, result);
6884 #endif /* EXPAND_DLFUNC */
6886 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
6889 uschar *save_lookup_value = lookup_value;
6891 if (Uskip_whitespace(&s) != '{') /*}*/
6894 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL);
6895 if (!key) goto EXPAND_FAILED; /*{{*/
6898 expand_string_message = US"missing '}' for name arg of env";
6899 goto EXPAND_FAILED_CURLY;
6902 lookup_value = US getenv(CS key);
6904 switch(process_yesno(
6905 skipping, /* were previously skipping */
6906 lookup_value != NULL, /* success/failure indicator */
6907 save_lookup_value, /* value to reset for string2 */
6908 &s, /* input pointer */
6909 &yield, /* output pointer */
6910 US"env", /* condition type */
6913 case 1: goto EXPAND_FAILED; /* when all is well, the */
6914 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6916 if (skipping) continue;
6921 case EITEM_SRS_ENCODE:
6922 /* ${srs_encode {secret} {return_path} {orig_domain}} */
6927 BOOL quoted = FALSE;
6929 switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok, NULL))
6931 case 1: goto EXPAND_FAILED_CURLY;
6933 case 3: goto EXPAND_FAILED;
6936 g = string_catn(g, US"SRS0=", 5);
6938 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
6939 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
6940 g = string_catn(g, cksum, sizeof(cksum));
6941 g = string_catn(g, US"=", 1);
6943 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
6949 gettimeofday(&now, NULL);
6950 for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5)
6951 h = string_catn(h, &base32_chars[i & 0x1f], 1);
6952 if (h) while (h->ptr > 0)
6953 g = string_catn(g, &h->s[--h->ptr], 1);
6955 g = string_catn(g, US"=", 1);
6957 /* ${domain:$return_path}=${local_part:$return_path} */
6959 int start, end, domain;
6960 uschar * t = parse_extract_address(sub[1], &expand_string_message,
6961 &start, &end, &domain, FALSE);
6967 if (domain > 0) g = string_cat(g, t + domain);
6968 g = string_catn(g, US"=", 1);
6970 s = domain > 0 ? string_copyn(t, domain - 1) : t;
6971 if ((quoted = Ustrchr(s, '"') != NULL))
6974 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
6975 while (*s) /* de-quote */
6977 while (*s && *s != '"') h = string_catn(h, s++, 1);
6979 while (*s && *s != '"') h = string_catn(h, s++, 1);
6982 gstring_release_unused(h);
6983 s = string_from_gstring(h);
6985 g = string_cat(g, s);
6988 /* Assume that if the original local_part had quotes
6989 it was for good reason */
6991 if (quoted) yield = string_catn(yield, US"\"", 1);
6992 yield = string_catn(yield, g->s, g->ptr);
6993 if (quoted) yield = string_catn(yield, US"\"", 1);
6995 /* @$original_domain */
6996 yield = string_catn(yield, US"@", 1);
6997 yield = string_cat(yield, sub[2]);
6999 if (skipping) continue;
7002 #endif /*SUPPORT_SRS*/
7006 } /* EITEM_* switch */
7010 if (yield && (start > 0 || *s)) /* only if not the sole expansion of the line */
7011 debug_expansion_interim(US"item-res",
7012 yield->s + start, yield->ptr - start, skipping);
7018 /* Control reaches here if the name is not recognized as one of the more
7019 complicated expansion items. Check for the "operator" syntax (name terminated
7020 by a colon). Some of the operators have arguments, separated by _ from the
7026 uschar * arg = NULL, * sub;
7028 var_entry * vp = NULL;
7031 /* Owing to an historical mis-design, an underscore may be part of the
7032 operator name, or it may introduce arguments. We therefore first scan the
7033 table of names that contain underscores. If there is no match, we cut off
7034 the arguments and then scan the main table. */
7036 if ((c = chop_match(name, op_table_underscore,
7037 nelem(op_table_underscore))) < 0)
7039 if ((arg = Ustrchr(name, '_')))
7041 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
7042 c += nelem(op_table_underscore);
7043 if (arg) *arg++ = '_'; /* Put back for error messages */
7046 /* Deal specially with operators that might take a certificate variable
7047 as we do not want to do the usual expansion. For most, expand the string.*/
7057 const uschar * s1 = s;
7058 sub = expand_string_internal(s+2, TRUE, &s1, skipping,
7059 FALSE, &resetok, NULL);
7060 if (!sub) goto EXPAND_FAILED; /*{*/
7063 expand_string_message =
7064 string_sprintf("missing '}' closing cert arg of %s", name);
7065 goto EXPAND_FAILED_CURLY;
7067 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
7077 sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok, NULL);
7078 if (!sub) goto EXPAND_FAILED;
7083 /* If we are skipping, we don't need to perform the operation at all.
7084 This matters for operations like "mask", because the data may not be
7085 in the correct format when skipping. For example, the expression may test
7086 for the existence of $sender_host_address before trying to mask it. For
7087 other operations, doing them may not fail, but it is a waste of time. */
7089 if (skipping && c >= 0) continue;
7091 /* Otherwise, switch on the operator type. After handling go back
7092 to the main loop top. */
7095 int start = yield->ptr;
7101 unsigned long int n = Ustrtoul(sub, &t, 10);
7106 expand_string_message = string_sprintf("argument for base32 "
7107 "operator is \"%s\", which is not a decimal number", sub);
7111 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7113 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7120 unsigned long int n = 0;
7123 uschar * t = Ustrchr(base32_chars, *tt++);
7126 expand_string_message = string_sprintf("argument for base32d "
7127 "operator is \"%s\", which is not a base 32 number", sub);
7130 n = n * 32 + (t - base32_chars);
7132 yield = string_fmt_append(yield, "%ld", n);
7139 unsigned long int n = Ustrtoul(sub, &t, 10);
7142 expand_string_message = string_sprintf("argument for base62 "
7143 "operator is \"%s\", which is not a decimal number", sub);
7146 yield = string_cat(yield, string_base62(n));
7150 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7155 unsigned long int n = 0;
7158 uschar *t = Ustrchr(base62_chars, *tt++);
7161 expand_string_message = string_sprintf("argument for base62d "
7162 "operator is \"%s\", which is not a base %d number", sub,
7166 n = n * BASE_62 + (t - base62_chars);
7168 yield = string_fmt_append(yield, "%ld", n);
7174 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok, NULL);
7177 expand_string_message =
7178 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7179 expand_string_message);
7182 yield = string_cat(yield, expanded);
7189 uschar *t = sub - 1;
7190 while (*(++t) != 0) { *t = tolower(*t); count++; }
7191 yield = string_catn(yield, sub, count);
7198 uschar *t = sub - 1;
7199 while (*(++t) != 0) { *t = toupper(*t); count++; }
7200 yield = string_catn(yield, sub, count);
7206 if (vp && *(void **)vp->value)
7208 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7209 yield = string_cat(yield, cp);
7217 md5_end(&base, sub, Ustrlen(sub), digest);
7218 for (int j = 0; j < 16; j++)
7219 yield = string_fmt_append(yield, "%02x", digest[j]);
7225 if (vp && *(void **)vp->value)
7227 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7228 yield = string_cat(yield, cp);
7236 sha1_end(&h, sub, Ustrlen(sub), digest);
7237 for (int j = 0; j < 20; j++)
7238 yield = string_fmt_append(yield, "%02X", digest[j]);
7244 #ifdef EXIM_HAVE_SHA2
7245 if (vp && *(void **)vp->value)
7246 if (c == EOP_SHA256)
7247 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7249 expand_string_message = US"sha2_N not supported with certificates";
7254 hashmethod m = !arg ? HASH_SHA2_256
7255 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7256 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7257 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7260 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7262 expand_string_message = US"unrecognised sha2 variant";
7266 exim_sha_update_string(&h, sub);
7267 exim_sha_finish(&h, &b);
7269 yield = string_fmt_append(yield, "%02X", *b.data++);
7272 expand_string_message = US"sha256 only supported with TLS";
7277 #ifdef EXIM_HAVE_SHA3
7281 hashmethod m = !arg ? HASH_SHA3_256
7282 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7283 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7284 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7285 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7288 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7290 expand_string_message = US"unrecognised sha3 variant";
7294 exim_sha_update_string(&h, sub);
7295 exim_sha_finish(&h, &b);
7297 yield = string_fmt_append(yield, "%02X", *b.data++);
7301 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7305 /* Convert hex encoding to base64 encoding */
7315 for (enc = sub; *enc; enc++)
7317 if (!isxdigit(*enc))
7319 expand_string_message = string_sprintf("\"%s\" is not a hex "
7328 expand_string_message = string_sprintf("\"%s\" contains an odd "
7329 "number of characters", sub);
7333 while ((c = *in++) != 0)
7335 if (isdigit(c)) c -= '0';
7336 else c = toupper(c) - 'A' + 10;
7346 enc = b64encode(CUS sub, out - sub);
7347 yield = string_cat(yield, enc);
7351 /* Convert octets outside 0x21..0x7E to \xXX form */
7355 uschar *t = sub - 1;
7358 if (*t < 0x21 || 0x7E < *t)
7359 yield = string_fmt_append(yield, "\\x%02x", *t);
7361 yield = string_catn(yield, t, 1);
7366 /* count the number of list elements */
7370 int cnt = 0, sep = 0;
7371 uschar * buf = store_get(2, sub);
7373 while (string_nextinlist(CUSS &sub, &sep, buf, 1)) cnt++;
7374 yield = string_fmt_append(yield, "%d", cnt);
7378 /* expand a named list given the name */
7379 /* handles nested named lists; requotes as colon-sep list */
7382 expand_string_message = NULL;
7383 yield = expand_listnamed(yield, sub, arg);
7384 if (expand_string_message)
7388 /* quote a list-item for the given list-separator */
7390 /* mask applies a mask to an IP address; for example the result of
7391 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7398 int type, mask, maskoffset;
7402 if ((type = string_is_ip_address(sub, &maskoffset)) == 0)
7404 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7409 if (maskoffset == 0)
7411 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7416 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7418 if (*endptr || mask < 0 || mask > (type == 4 ? 32 : 128))
7420 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7425 /* If an optional 'n' was given, ipv6 gets normalised output:
7426 colons rather than dots, and zero-compressed. */
7428 normalised = arg && *arg == 'n';
7430 /* Convert the address to binary integer(s) and apply the mask */
7432 sub[maskoffset] = 0;
7433 count = host_aton(sub, binary);
7434 host_mask(count, binary, mask);
7436 /* Convert to masked textual format and add to output. */
7438 if (type == 4 || !normalised)
7439 yield = string_catn(yield, buffer,
7440 host_nmtoa(count, binary, mask, buffer, '.'));
7443 ipv6_nmtoa(binary, buffer);
7444 yield = string_fmt_append(yield, "%s/%d", buffer, mask);
7450 case EOP_IPV6DENORM:
7452 int type = string_is_ip_address(sub, NULL);
7459 (void) host_aton(sub, binary);
7462 case 4: /* convert to IPv4-mapped IPv6 */
7463 binary[0] = binary[1] = 0;
7464 binary[2] = 0x0000ffff;
7465 (void) host_aton(sub, binary+3);
7469 expand_string_message =
7470 string_sprintf("\"%s\" is not an IP address", sub);
7474 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7475 ? ipv6_nmtoa(binary, buffer)
7476 : host_nmtoa(4, binary, -1, buffer, ':')
7482 case EOP_LOCAL_PART:
7486 int start, end, domain;
7487 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7490 if (c != EOP_DOMAIN)
7491 yield = c == EOP_LOCAL_PART && domain > 0
7492 ? string_catn(yield, t, domain - 1)
7493 : string_cat(yield, t);
7494 else if (domain > 0)
7495 yield = string_cat(yield, t + domain);
7501 uschar outsep[2] = { ':', '\0' };
7502 uschar *address, *error;
7503 int save_ptr = gstring_length(yield);
7504 int start, end, domain; /* Not really used */
7506 if (Uskip_whitespace(&sub) == '>')
7507 if (*outsep = *++sub) ++sub;
7510 expand_string_message = string_sprintf("output separator "
7511 "missing in expanding ${addresses:%s}", --sub);
7514 f.parse_allow_group = TRUE;
7518 uschar * p = parse_find_address_end(sub, FALSE);
7519 uschar saveend = *p;
7521 address = parse_extract_address(sub, &error, &start, &end, &domain,
7525 /* Add the address to the output list that we are building. This is
7526 done in chunks by searching for the separator character. At the
7527 start, unless we are dealing with the first address of the output
7528 list, add in a space if the new address begins with the separator
7529 character, or is an empty string. */
7533 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7534 yield = string_catn(yield, US" ", 1);
7538 size_t seglen = Ustrcspn(address, outsep);
7539 yield = string_catn(yield, address, seglen + 1);
7541 /* If we got to the end of the string we output one character
7544 if (address[seglen] == '\0') { yield->ptr--; break; }
7545 yield = string_catn(yield, outsep, 1);
7546 address += seglen + 1;
7549 /* Output a separator after the string: we will remove the
7550 redundant final one at the end. */
7552 yield = string_catn(yield, outsep, 1);
7555 if (saveend == '\0') break;
7559 /* If we have generated anything, remove the redundant final
7562 if (yield && yield->ptr != save_ptr) yield->ptr--;
7563 f.parse_allow_group = FALSE;
7568 /* quote puts a string in quotes if it is empty or contains anything
7569 other than alphamerics, underscore, dot, or hyphen.
7571 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7572 be quoted in order to be a valid local part.
7574 In both cases, newlines and carriage returns are converted into \n and \r
7578 case EOP_QUOTE_LOCAL_PART:
7581 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7582 uschar *t = sub - 1;
7585 while (!needs_quote && *++t)
7586 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7588 else /* EOP_QUOTE_LOCAL_PART */
7589 while (!needs_quote && *++t)
7590 needs_quote = !isalnum(*t)
7591 && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL
7592 && (*t != '.' || t == sub || !t[1]);
7596 yield = string_catn(yield, US"\"", 1);
7600 yield = string_catn(yield, US"\\n", 2);
7601 else if (*t == '\r')
7602 yield = string_catn(yield, US"\\r", 2);
7605 if (*t == '\\' || *t == '"')
7606 yield = string_catn(yield, US"\\", 1);
7607 yield = string_catn(yield, t, 1);
7609 yield = string_catn(yield, US"\"", 1);
7612 yield = string_cat(yield, sub);
7616 /* quote_lookuptype does lookup-specific quoting */
7621 uschar * opt = Ustrchr(arg, '_');
7623 if (opt) *opt++ = 0;
7625 if ((n = search_findtype(arg, Ustrlen(arg))) < 0)
7627 expand_string_message = search_error_message;
7631 if (lookup_list[n]->quote)
7632 sub = (lookup_list[n]->quote)(sub, opt, (unsigned)n);
7638 expand_string_message = string_sprintf(
7639 "\"%s\" unrecognized after \"${quote_%s\"", /*}*/
7644 yield = string_cat(yield, sub);
7648 /* rx quote sticks in \ before any non-alphameric character so that
7649 the insertion works in a regular expression. */
7653 uschar *t = sub - 1;
7657 yield = string_catn(yield, US"\\", 1);
7658 yield = string_catn(yield, t, 1);
7663 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7664 prescribed by the RFC, if there are characters that need to be encoded */
7667 yield = string_cat(yield,
7668 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7672 /* RFC 2047 decode */
7678 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7679 headers_charset, '?', &len, &error);
7682 expand_string_message = error;
7685 yield = string_catn(yield, decoded, len);
7689 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7694 uschar * buff = store_get(4, sub);
7699 if (c > 255) c = '_';
7701 yield = string_catn(yield, buff, 1);
7706 /* replace illegal UTF-8 sequences by replacement character */
7708 #define UTF8_REPLACEMENT_CHAR US"?"
7712 int seq_len = 0, index = 0;
7714 long codepoint = -1;
7716 uschar seq_buff[4]; /* accumulate utf-8 here */
7718 /* Manually track tainting, as we deal in individual chars below */
7720 if (!yield->s || !yield->ptr)
7721 yield->s = store_get(yield->size = Ustrlen(sub), sub);
7722 else if (is_incompatible(yield->s, sub))
7723 gstring_rebuffer(yield, sub);
7725 /* Check the UTF-8, byte-by-byte */
7734 if ((c & 0xc0) != 0x80)
7735 /* wrong continuation byte; invalidate all bytes */
7736 complete = 1; /* error */
7739 codepoint = (codepoint << 6) | (c & 0x3f);
7740 seq_buff[index++] = c;
7741 if (--bytes_left == 0) /* codepoint complete */
7742 if(codepoint > 0x10FFFF) /* is it too large? */
7743 complete = -1; /* error (RFC3629 limit) */
7745 { /* finished; output utf-8 sequence */
7746 yield = string_catn(yield, seq_buff, seq_len);
7751 else /* no bytes left: new sequence */
7753 if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7755 yield = string_catn(yield, &c, 1);
7758 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
7760 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7765 codepoint = c & 0x1f;
7768 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
7771 codepoint = c & 0x0f;
7773 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
7776 codepoint = c & 0x07;
7778 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7781 seq_buff[index++] = c;
7782 seq_len = bytes_left + 1;
7783 } /* if(bytes_left) */
7787 bytes_left = index = 0;
7788 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7790 if ((complete == 1) && ((c & 0x80) == 0))
7791 /* ASCII character follows incomplete sequence */
7792 yield = string_catn(yield, &c, 1);
7794 /* If given a sequence truncated mid-character, we also want to report ?
7795 Eg, ${length_1:フィル} is one byte, not one character, so we expect
7796 ${utf8clean:${length_1:フィル}} to yield '?' */
7798 if (bytes_left != 0)
7799 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7805 case EOP_UTF8_DOMAIN_TO_ALABEL:
7807 uschar * error = NULL;
7808 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7811 expand_string_message = string_sprintf(
7812 "error converting utf8 (%s) to alabel: %s",
7813 string_printing(sub), error);
7816 yield = string_cat(yield, s);
7820 case EOP_UTF8_DOMAIN_FROM_ALABEL:
7822 uschar * error = NULL;
7823 uschar * s = string_domain_alabel_to_utf8(sub, &error);
7826 expand_string_message = string_sprintf(
7827 "error converting alabel (%s) to utf8: %s",
7828 string_printing(sub), error);
7831 yield = string_cat(yield, s);
7835 case EOP_UTF8_LOCALPART_TO_ALABEL:
7837 uschar * error = NULL;
7838 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
7841 expand_string_message = string_sprintf(
7842 "error converting utf8 (%s) to alabel: %s",
7843 string_printing(sub), error);
7846 yield = string_cat(yield, s);
7847 DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s);
7851 case EOP_UTF8_LOCALPART_FROM_ALABEL:
7853 uschar * error = NULL;
7854 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
7857 expand_string_message = string_sprintf(
7858 "error converting alabel (%s) to utf8: %s",
7859 string_printing(sub), error);
7862 yield = string_cat(yield, s);
7865 #endif /* EXPERIMENTAL_INTERNATIONAL */
7867 /* escape turns all non-printing characters into escape sequences. */
7871 const uschar * t = string_printing(sub);
7872 yield = string_cat(yield, t);
7876 case EOP_ESCAPE8BIT:
7880 for (const uschar * s = sub; (c = *s); s++)
7881 yield = c < 127 && c != '\\'
7882 ? string_catn(yield, s, 1)
7883 : string_fmt_append(yield, "\\%03o", c);
7887 /* Handle numeric expression evaluation */
7892 uschar *save_sub = sub;
7893 uschar *error = NULL;
7894 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
7897 expand_string_message = string_sprintf("error in expression "
7898 "evaluation: %s (after processing \"%.*s\")", error,
7899 (int)(sub-save_sub), save_sub);
7902 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
7906 /* Handle time period formatting */
7910 int n = readconf_readtime(sub, 0, FALSE);
7913 expand_string_message = string_sprintf("string \"%s\" is not an "
7914 "Exim time interval in \"%s\" operator", sub, name);
7917 yield = string_fmt_append(yield, "%d", n);
7921 case EOP_TIME_INTERVAL:
7924 uschar *t = read_number(&n, sub);
7925 if (*t != 0) /* Not A Number*/
7927 expand_string_message = string_sprintf("string \"%s\" is not a "
7928 "positive number in \"%s\" operator", sub, name);
7931 t = readconf_printtime(n);
7932 yield = string_cat(yield, t);
7936 /* Convert string to base64 encoding */
7942 uschar * s = vp && *(void **)vp->value
7943 ? tls_cert_der_b64(*(void **)vp->value)
7944 : b64encode(CUS sub, Ustrlen(sub));
7946 uschar * s = b64encode(CUS sub, Ustrlen(sub));
7948 yield = string_cat(yield, s);
7955 int len = b64decode(sub, &s);
7958 expand_string_message = string_sprintf("string \"%s\" is not "
7959 "well-formed for \"%s\" operator", sub, name);
7962 yield = string_cat(yield, s);
7966 /* strlen returns the length of the string */
7969 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
7972 /* length_n or l_n takes just the first n characters or the whole string,
7973 whichever is the shorter;
7975 substr_m_n, and s_m_n take n characters from offset m; negative m take
7976 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
7977 takes the rest, either to the right or to the left.
7979 hash_n or h_n makes a hash of length n from the string, yielding n
7980 characters from the set a-z; hash_n_m makes a hash of length n, but
7981 uses m characters from the set a-zA-Z0-9.
7983 nhash_n returns a single number between 0 and n-1 (in text form), while
7984 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
7985 between 0 and n-1 and the second between 0 and m-1. */
8005 expand_string_message = string_sprintf("missing values after %s",
8010 /* "length" has only one argument, effectively being synonymous with
8013 if (c == EOP_LENGTH || c == EOP_L)
8019 /* The others have one or two arguments; for "substr" the first may be
8020 negative. The second being negative means "not supplied". */
8025 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
8028 /* Read up to two numbers, separated by underscores */
8033 if (arg != ret && *arg == '_' && pn == &value1)
8037 if (arg[1] != 0) arg++;
8039 else if (!isdigit(*arg))
8041 expand_string_message =
8042 string_sprintf("non-digit after underscore in \"%s\"", name);
8045 else *pn = (*pn)*10 + *arg++ - '0';
8049 /* Perform the required operation */
8051 ret = c == EOP_HASH || c == EOP_H
8052 ? compute_hash(sub, value1, value2, &len)
8053 : c == EOP_NHASH || c == EOP_NH
8054 ? compute_nhash(sub, value1, value2, &len)
8055 : extract_substr(sub, value1, value2, &len);
8056 if (!ret) goto EXPAND_FAILED;
8058 yield = string_catn(yield, ret, len);
8067 uschar **modetable[3];
8071 if (expand_forbid & RDO_EXISTS)
8073 expand_string_message = US"Use of the stat() expansion is not permitted";
8077 if (stat(CS sub, &st) < 0)
8079 expand_string_message = string_sprintf("stat(%s) failed: %s",
8080 sub, strerror(errno));
8084 switch (mode & S_IFMT)
8086 case S_IFIFO: smode[0] = 'p'; break;
8087 case S_IFCHR: smode[0] = 'c'; break;
8088 case S_IFDIR: smode[0] = 'd'; break;
8089 case S_IFBLK: smode[0] = 'b'; break;
8090 case S_IFREG: smode[0] = '-'; break;
8091 default: smode[0] = '?'; break;
8094 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8095 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8096 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8098 for (int i = 0; i < 3; i++)
8100 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8105 yield = string_fmt_append(yield,
8106 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8107 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8108 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8109 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8110 (long)st.st_gid, st.st_size, (long)st.st_atime,
8111 (long)st.st_mtime, (long)st.st_ctime);
8115 /* vaguely random number less than N */
8119 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8121 if (expand_string_message)
8123 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8127 /* Reverse IP, including IPv6 to dotted-nibble */
8129 case EOP_REVERSE_IP:
8131 int family, maskptr;
8132 uschar reversed[128];
8134 family = string_is_ip_address(sub, &maskptr);
8137 expand_string_message = string_sprintf(
8138 "reverse_ip() not given an IP address [%s]", sub);
8141 invert_address(reversed, sub);
8142 yield = string_cat(yield, reversed);
8146 /* Unknown operator */
8149 expand_string_message =
8150 string_sprintf("unknown expansion operator \"%s\"", name);
8152 } /* EOP_* switch */
8156 const uschar * s = yield->s + start;
8157 int i = yield->ptr - start;
8158 BOOL tainted = is_tainted(s);
8162 debug_printf_indent("|-----op-res: %.*s\n", i, s);
8165 debug_printf_indent("%s \\__", skipping ? "| " : " ");
8166 debug_print_taint(yield->s);
8171 debug_printf_indent(UTF8_VERT_RIGHT
8172 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8173 "op-res: %.*s\n", i, s);
8176 debug_printf_indent("%s",
8178 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8179 debug_print_taint(yield->s);
8187 /* Not an item or an operator */
8188 /* Handle a plain name. If this is the first thing in the expansion, release
8189 the pre-allocated buffer. If the result data is known to be in a new buffer,
8190 newsize will be set to the size of that buffer, and we can just point at that
8191 store instead of copying. Many expansion strings contain just one reference,
8192 so this is a useful optimization, especially for humungous headers
8193 ($message_headers). */
8197 const uschar * value;
8203 g = store_get(sizeof(gstring), GET_UNTAINTED);
8204 else if (yield->ptr == 0)
8206 if (resetok) reset_point = store_reset(reset_point);
8208 reset_point = store_mark();
8209 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
8211 if (!(value = find_variable(name, FALSE, skipping, &newsize)))
8213 expand_string_message =
8214 string_sprintf("unknown variable in \"${%s}\"", name);
8215 check_variable_error_message(name);
8218 len = Ustrlen(value);
8219 if (!yield && newsize)
8222 yield->size = newsize;
8224 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
8227 yield = string_catn(yield, value, len);
8231 /* Else there's something wrong */
8233 expand_string_message =
8234 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8235 "in a variable reference)", name);
8239 /* If we hit the end of the string when ket_ends is set, there is a missing
8240 terminating brace. */
8242 if (ket_ends && !*s)
8244 expand_string_message = malformed_header
8245 ? US"missing } at end of string - could be header name not terminated by colon"
8246 : US"missing } at end of string";
8250 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8251 added to the string. If so, set up an empty string. Add a terminating zero. If
8252 left != NULL, return a pointer to the terminator. */
8255 yield = string_get(1);
8256 (void) string_from_gstring(yield);
8257 if (left) *left = s;
8259 /* Any stacking store that was used above the final string is no longer needed.
8260 In many cases the final string will be the first one that was got and so there
8261 will be optimal store usage. */
8263 if (resetok) gstring_release_unused(yield);
8264 else if (resetok_p) *resetok_p = FALSE;
8268 BOOL tainted = is_tainted(yield->s);
8271 debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string);
8272 debug_printf_indent("%sresult: %s\n",
8273 skipping ? "|-----" : "\\_____", yield->s);
8276 debug_printf_indent("%s \\__", skipping ? "| " : " ");
8277 debug_print_taint(yield->s);
8280 debug_printf_indent("\\___skipping: result is not used\n");
8284 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
8285 "expanding: %.*s\n",
8286 (int)(s - string), string);
8287 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8289 skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8293 debug_printf_indent("%s",
8295 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8296 debug_print_taint(yield->s);
8299 debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8300 "skipping: result is not used\n");
8303 if (textonly_p) *textonly_p = textonly;
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;
8353 /* This is the external function call. Do a quick check for any expansion
8354 metacharacters, and if there are none, just return the input string.
8357 the string to be expanded
8358 optional pointer for return boolean indicating no-dynamic-expansions
8360 Returns: the expanded string, or NULL if expansion failed; if failure was
8361 due to a lookup deferring, search_find_defer will be TRUE
8365 expand_string_2(const uschar * string, BOOL * textonly_p)
8367 if (Ustrpbrk(string, "$\\") != NULL)
8369 int old_pool = store_pool;
8372 f.search_find_defer = FALSE;
8373 malformed_header = FALSE;
8374 store_pool = POOL_MAIN;
8375 s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL, textonly_p);
8376 store_pool = old_pool;
8379 if (textonly_p) *textonly_p = TRUE;
8384 expand_cstring(const uschar * string)
8385 { return expand_string_2(string, NULL); }
8388 expand_string(uschar * string)
8389 { return US expand_string_2(CUS string, NULL); }
8396 /*************************************************
8398 *************************************************/
8400 /* Now and again we want to expand a string and be sure that the result is in a
8401 new bit of store. This function does that.
8402 Since we know it has been copied, the de-const cast is safe.
8404 Argument: the string to be expanded
8405 Returns: the expanded string, always in a new bit of store, or NULL
8409 expand_string_copy(const uschar *string)
8411 const uschar *yield = expand_cstring(string);
8412 if (yield == string) yield = string_copy(string);
8418 /*************************************************
8419 * Expand and interpret as an integer *
8420 *************************************************/
8422 /* Expand a string, and convert the result into an integer.
8425 string the string to be expanded
8426 isplus TRUE if a non-negative number is expected
8428 Returns: the integer value, or
8429 -1 for an expansion error ) in both cases, message in
8430 -2 for an integer interpretation error ) expand_string_message
8431 expand_string_message is set NULL for an OK integer
8435 expand_string_integer(uschar *string, BOOL isplus)
8437 return expanded_string_integer(expand_string(string), isplus);
8441 /*************************************************
8442 * Interpret string as an integer *
8443 *************************************************/
8445 /* Convert a string (that has already been expanded) into an integer.
8447 This function is used inside the expansion code.
8450 s the string to be expanded
8451 isplus TRUE if a non-negative number is expected
8453 Returns: the integer value, or
8454 -1 if string is NULL (which implies an expansion error)
8455 -2 for an integer interpretation error
8456 expand_string_message is set NULL for an OK integer
8459 static int_eximarith_t
8460 expanded_string_integer(const uschar *s, BOOL isplus)
8462 int_eximarith_t value;
8463 uschar *msg = US"invalid integer \"%s\"";
8466 /* If expansion failed, expand_string_message will be set. */
8470 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8471 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8472 systems, so we set it zero ourselves. */
8475 expand_string_message = NULL; /* Indicates no error */
8477 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8478 equal to 0. Unfortunately, people actually relied upon that, so preserve
8479 the behaviour explicitly. Stripping leading whitespace is a harmless
8480 noop change since strtol skips it anyway (provided that there is a number
8483 if (Uskip_whitespace(&s) == '\0')
8486 debug_printf_indent("treating blank string as number 0\n");
8490 value = strtoll(CS s, CSS &endptr, 10);
8493 msg = US"integer expected but \"%s\" found";
8494 else if (value < 0 && isplus)
8495 msg = US"non-negative integer expected but \"%s\" found";
8498 switch (tolower(*endptr))
8503 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8508 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8509 else value *= 1024*1024;
8513 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8514 else value *= 1024*1024*1024;
8518 if (errno == ERANGE)
8519 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8521 if (Uskip_whitespace(&endptr) == 0) return value;
8524 expand_string_message = string_sprintf(CS msg, s);
8529 /* These values are usually fixed boolean values, but they are permitted to be
8533 addr address being routed
8534 mtype the module type
8535 mname the module name
8536 dbg_opt debug selectors
8537 oname the option name
8538 bvalue the router's boolean value
8539 svalue the router's string value
8540 rvalue where to put the returned value
8542 Returns: OK value placed in rvalue
8543 DEFER expansion failed
8547 exp_bool(address_item *addr,
8548 uschar *mtype, uschar *mname, unsigned dbg_opt,
8549 uschar *oname, BOOL bvalue,
8550 uschar *svalue, BOOL *rvalue)
8553 if (!svalue) { *rvalue = bvalue; return OK; }
8555 if (!(expanded = expand_string(svalue)))
8557 if (f.expand_string_forcedfail)
8559 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8563 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8564 oname, mname, mtype, expand_string_message);
8565 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8569 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8572 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8574 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8578 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8579 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8588 /* Avoid potentially exposing a password in a string about to be logged */
8591 expand_hide_passwords(uschar * s)
8593 return ( ( Ustrstr(s, "failed to expand") != NULL
8594 || Ustrstr(s, "expansion of ") != NULL
8596 && ( Ustrstr(s, "mysql") != NULL
8597 || Ustrstr(s, "pgsql") != NULL
8598 || Ustrstr(s, "redis") != NULL
8599 || Ustrstr(s, "sqlite") != NULL
8600 || Ustrstr(s, "ldap:") != NULL
8601 || Ustrstr(s, "ldaps:") != NULL
8602 || Ustrstr(s, "ldapi:") != NULL
8603 || Ustrstr(s, "ldapdn:") != NULL
8604 || Ustrstr(s, "ldapm:") != NULL
8606 ? US"Temporary internal error" : s;
8610 /* Read given named file into big_buffer. Use for keying material etc.
8611 The content will have an ascii NUL appended.
8616 Return: pointer to buffer, or NULL on error.
8620 expand_file_big_buffer(const uschar * filename)
8622 int fd, off = 0, len;
8624 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8626 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8633 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8636 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8644 big_buffer[off] = '\0';
8650 /*************************************************
8651 * Error-checking for testsuite *
8652 *************************************************/
8654 uschar * region_start;
8655 uschar * region_end;
8656 const uschar *var_name;
8657 const uschar *var_data;
8660 /* Called via tree_walk, which allows nonconst name/data. Our usage is const. */
8662 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8665 if (var_data >= e->region_start && var_data < e->region_end)
8667 e->var_name = CUS var_name;
8668 e->var_data = CUS var_data;
8673 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8675 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8676 .var_name = NULL, .var_data = NULL };
8678 /* check acl_ variables */
8679 tree_walk(acl_var_c, assert_variable_notin, &e);
8680 tree_walk(acl_var_m, assert_variable_notin, &e);
8682 /* check auth<n> variables.
8683 assert_variable_notin() treats as const, so deconst is safe. */
8684 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8685 assert_variable_notin(US"auth<n>", US auth_vars[i], &e);
8687 /* check regex<n> variables. assert_variable_notin() treats as const. */
8688 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8689 assert_variable_notin(US"regex<n>", US regex_vars[i], &e);
8691 /* check known-name variables */
8692 for (var_entry * v = var_table; v < var_table + var_table_size; v++)
8693 if (v->type == vtype_stringptr)
8694 assert_variable_notin(US v->name, *(USS v->value), &e);
8696 /* check dns and address trees */
8697 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8698 tree_walk(tree_duplicates, assert_variable_notin, &e);
8699 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8700 tree_walk(tree_unusable, assert_variable_notin, &e);
8703 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8704 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8705 e.var_name, filename, linenumber, e.var_data);
8710 /*************************************************
8711 **************************************************
8712 * Stand-alone test program *
8713 **************************************************
8714 *************************************************/
8720 regex_match_and_setup(const pcre2_code *re, uschar *subject, int options, int setup)
8722 int ovec[3*(EXPAND_MAXN+1)];
8723 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8725 BOOL yield = n >= 0;
8726 if (n == 0) n = EXPAND_MAXN + 1;
8729 expand_nmax = setup < 0 ? 0 : setup + 1;
8730 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8732 expand_nstring[expand_nmax] = subject + ovec[nn];
8733 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
8741 int main(int argc, uschar **argv)
8743 uschar buffer[1024];
8745 debug_selector = D_v;
8746 debug_file = stderr;
8747 debug_fd = fileno(debug_file);
8748 big_buffer = malloc(big_buffer_size);
8751 for (int i = 1; i < argc; i++)
8753 if (argv[i][0] == '+')
8755 debug_trace_memory = 2;
8758 if (isdigit(argv[i][0]))
8759 debug_selector = Ustrtol(argv[i], NULL, 0);
8761 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8765 eldap_default_servers = argv[i];
8768 mysql_servers = argv[i];
8771 pgsql_servers = argv[i];
8774 redis_servers = argv[i];
8778 else opt_perl_startup = argv[i];
8782 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8784 expand_nstring[1] = US"string 1....";
8785 expand_nlength[1] = 8;
8789 if (opt_perl_startup != NULL)
8792 printf("Starting Perl interpreter\n");
8793 errstr = init_perl(opt_perl_startup);
8796 printf("** error in perl_startup code: %s\n", errstr);
8797 return EXIT_FAILURE;
8800 #endif /* EXIM_PERL */
8802 /* Thie deliberately regards the input as untainted, so that it can be
8803 expanded; only reasonable since this is a test for string-expansions. */
8805 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8807 rmark reset_point = store_mark();
8808 uschar *yield = expand_string(buffer);
8810 printf("%s\n", yield);
8813 if (f.search_find_defer) printf("search_find deferred\n");
8814 printf("Failed: %s\n", expand_string_message);
8815 if (f.expand_string_forcedfail) printf("Forced failure\n");
8818 store_reset(reset_point);
8830 /* End of expand.c */