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. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
10 /* Code for handling Access Control Lists (ACLs) */
16 /* Default callout timeout */
18 #define CALLOUT_TIMEOUT_DEFAULT 30
20 /* Default quota cache TTLs */
22 #define QUOTA_POS_DEFAULT (5*60)
23 #define QUOTA_NEG_DEFAULT (60*60)
26 /* ACL verb codes - keep in step with the table of verbs that follows */
28 enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE,
33 static uschar *verbs[] = {
34 [ACL_ACCEPT] = US"accept",
35 [ACL_DEFER] = US"defer",
36 [ACL_DENY] = US"deny",
37 [ACL_DISCARD] = US"discard",
38 [ACL_DROP] = US"drop",
39 [ACL_REQUIRE] = US"require",
43 /* For each verb, the conditions for which "message" or "log_message" are used
44 are held as a bitmap. This is to avoid expanding the strings unnecessarily. For
45 "accept", the FAIL case is used only after "endpass", but that is selected in
48 static int msgcond[] = {
49 [ACL_ACCEPT] = BIT(OK) | BIT(FAIL) | BIT(FAIL_DROP),
50 [ACL_DEFER] = BIT(OK),
52 [ACL_DISCARD] = BIT(OK) | BIT(FAIL) | BIT(FAIL_DROP),
54 [ACL_REQUIRE] = BIT(FAIL) | BIT(FAIL_DROP),
60 /* ACL condition and modifier codes - keep in step with the table that
67 #ifdef EXPERIMENTAL_BRIGHTMAIL
73 #ifdef EXPERIMENTAL_DCC
76 #ifdef WITH_CONTENT_SCAN
94 ACLC_LOG_REJECT_TARGET,
96 #ifdef WITH_CONTENT_SCAN
100 #ifdef WITH_CONTENT_SCAN
106 #ifdef WITH_CONTENT_SCAN
114 #ifdef WITH_CONTENT_SCAN
124 /* ACL conditions/modifiers: "delay", "control", "continue", "endpass",
125 "message", "log_message", "log_reject_target", "logwrite", "queue" and "set" are
126 modifiers that look like conditions but always return TRUE. They are used for
127 their side effects. Do not invent new modifier names that result in one name
128 being the prefix of another; the binary-search in the list will go wrong. */
130 typedef struct condition_def {
133 /* Flag to indicate the condition/modifier has a string expansion done
134 at the outer level. In the other cases, expansion already occurs in the
135 checking functions. */
136 BOOL expand_at_top:1;
140 /* Bit map vector of which conditions and modifiers are not allowed at certain
141 times. For each condition and modifier, there's a bitmap of dis-allowed times.
142 For some, it is easier to specify the negation of a small number of allowed
148 static condition_def conditions[] = {
149 [ACLC_ACL] = { US"acl", FALSE, FALSE, 0 },
151 [ACLC_ADD_HEADER] = { US"add_header", TRUE, TRUE,
153 ~(ACL_BIT_MAIL | ACL_BIT_RCPT |
154 ACL_BIT_PREDATA | ACL_BIT_DATA |
158 ACL_BIT_MIME | ACL_BIT_NOTSMTP |
160 ACL_BIT_NOTSMTP_START),
163 [ACLC_AUTHENTICATED] = { US"authenticated", FALSE, FALSE,
164 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
165 ACL_BIT_CONNECT | ACL_BIT_HELO,
167 #ifdef EXPERIMENTAL_BRIGHTMAIL
168 [ACLC_BMI_OPTIN] = { US"bmi_optin", TRUE, TRUE,
170 ACL_BIT_CONNECT | ACL_BIT_HELO |
171 ACL_BIT_DATA | ACL_BIT_MIME |
172 # ifndef DISABLE_PRDR
175 ACL_BIT_ETRN | ACL_BIT_EXPN |
177 ACL_BIT_MAIL | ACL_BIT_STARTTLS |
178 ACL_BIT_VRFY | ACL_BIT_PREDATA |
179 ACL_BIT_NOTSMTP_START,
182 [ACLC_CONDITION] = { US"condition", TRUE, FALSE, 0 },
183 [ACLC_CONTINUE] = { US"continue", TRUE, TRUE, 0 },
185 /* Certain types of control are always allowed, so we let it through
186 always and check in the control processing itself. */
187 [ACLC_CONTROL] = { US"control", TRUE, TRUE, 0 },
189 #ifdef EXPERIMENTAL_DCC
190 [ACLC_DCC] = { US"dcc", TRUE, FALSE,
193 # ifndef DISABLE_PRDR
199 #ifdef WITH_CONTENT_SCAN
200 [ACLC_DECODE] = { US"decode", TRUE, FALSE, (unsigned int) ~ACL_BIT_MIME },
203 [ACLC_DELAY] = { US"delay", TRUE, TRUE, ACL_BIT_NOTQUIT },
205 [ACLC_DKIM_SIGNER] = { US"dkim_signers", TRUE, FALSE, (unsigned int) ~ACL_BIT_DKIM },
206 [ACLC_DKIM_STATUS] = { US"dkim_status", TRUE, FALSE,
208 ~(ACL_BIT_DKIM | ACL_BIT_DATA | ACL_BIT_MIME
209 # ifndef DISABLE_PRDR
216 [ACLC_DMARC_STATUS] = { US"dmarc_status", TRUE, FALSE, (unsigned int) ~ACL_BIT_DATA },
219 /* Explicit key lookups can be made in non-smtp ACLs so pass
220 always and check in the verify processing itself. */
221 [ACLC_DNSLISTS] = { US"dnslists", TRUE, FALSE, 0 },
223 [ACLC_DOMAINS] = { US"domains", FALSE, FALSE,
225 ~(ACL_BIT_RCPT | ACL_BIT_VRFY
231 [ACLC_ENCRYPTED] = { US"encrypted", FALSE, FALSE,
232 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
236 [ACLC_ENDPASS] = { US"endpass", TRUE, TRUE, 0 },
238 [ACLC_HOSTS] = { US"hosts", FALSE, FALSE,
239 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START,
241 [ACLC_LOCAL_PARTS] = { US"local_parts", FALSE, FALSE,
243 ~(ACL_BIT_RCPT | ACL_BIT_VRFY
250 [ACLC_LOG_MESSAGE] = { US"log_message", TRUE, TRUE, 0 },
251 [ACLC_LOG_REJECT_TARGET] = { US"log_reject_target", TRUE, TRUE, 0 },
252 [ACLC_LOGWRITE] = { US"logwrite", TRUE, TRUE, 0 },
254 #ifdef WITH_CONTENT_SCAN
255 [ACLC_MALWARE] = { US"malware", TRUE, FALSE,
258 # ifndef DISABLE_PRDR
265 [ACLC_MESSAGE] = { US"message", TRUE, TRUE, 0 },
266 #ifdef WITH_CONTENT_SCAN
267 [ACLC_MIME_REGEX] = { US"mime_regex", TRUE, FALSE, (unsigned int) ~ACL_BIT_MIME },
270 [ACLC_QUEUE] = { US"queue", TRUE, TRUE,
278 [ACLC_RATELIMIT] = { US"ratelimit", TRUE, FALSE, 0 },
279 [ACLC_RECIPIENTS] = { US"recipients", FALSE, FALSE, (unsigned int) ~ACL_BIT_RCPT },
281 #ifdef WITH_CONTENT_SCAN
282 [ACLC_REGEX] = { US"regex", TRUE, FALSE,
285 # ifndef DISABLE_PRDR
293 [ACLC_REMOVE_HEADER] = { US"remove_header", TRUE, TRUE,
295 ~(ACL_BIT_MAIL|ACL_BIT_RCPT |
296 ACL_BIT_PREDATA | ACL_BIT_DATA |
300 ACL_BIT_MIME | ACL_BIT_NOTSMTP |
301 ACL_BIT_NOTSMTP_START),
303 [ACLC_SEEN] = { US"seen", TRUE, FALSE, 0 },
304 [ACLC_SENDER_DOMAINS] = { US"sender_domains", FALSE, FALSE,
305 ACL_BIT_AUTH | ACL_BIT_CONNECT |
307 ACL_BIT_MAILAUTH | ACL_BIT_QUIT |
308 ACL_BIT_ETRN | ACL_BIT_EXPN |
309 ACL_BIT_STARTTLS | ACL_BIT_VRFY,
311 [ACLC_SENDERS] = { US"senders", FALSE, FALSE,
312 ACL_BIT_AUTH | ACL_BIT_CONNECT |
314 ACL_BIT_MAILAUTH | ACL_BIT_QUIT |
315 ACL_BIT_ETRN | ACL_BIT_EXPN |
316 ACL_BIT_STARTTLS | ACL_BIT_VRFY,
319 [ACLC_SET] = { US"set", TRUE, TRUE, 0 },
321 #ifdef WITH_CONTENT_SCAN
322 [ACLC_SPAM] = { US"spam", TRUE, FALSE,
323 (unsigned int) ~(ACL_BIT_DATA |
324 # ifndef DISABLE_PRDR
331 [ACLC_SPF] = { US"spf", TRUE, FALSE,
332 ACL_BIT_AUTH | ACL_BIT_CONNECT |
333 ACL_BIT_HELO | ACL_BIT_MAILAUTH |
334 ACL_BIT_ETRN | ACL_BIT_EXPN |
335 ACL_BIT_STARTTLS | ACL_BIT_VRFY |
336 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START,
338 [ACLC_SPF_GUESS] = { US"spf_guess", TRUE, FALSE,
339 ACL_BIT_AUTH | ACL_BIT_CONNECT |
340 ACL_BIT_HELO | ACL_BIT_MAILAUTH |
341 ACL_BIT_ETRN | ACL_BIT_EXPN |
342 ACL_BIT_STARTTLS | ACL_BIT_VRFY |
343 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START,
346 [ACLC_UDPSEND] = { US"udpsend", TRUE, TRUE, 0 },
348 /* Certain types of verify are always allowed, so we let it through
349 always and check in the verify function itself */
350 [ACLC_VERIFY] = { US"verify", TRUE, FALSE, 0 },
355 # include "macro_predef.h"
359 for (condition_def * c = conditions; c < conditions + nelem(conditions); c++)
361 uschar buf[64], * p, * s;
362 int n = sprintf(CS buf, "_ACL_%s_", c->is_modifier ? "MOD" : "COND");
363 for (p = buf + n, s = c->name; *s; s++) *p++ = toupper(*s);
365 builtin_macro_create(buf);
373 /* Return values from decode_control(); used as index so keep in step
374 with the controls_list table that follows! */
377 CONTROL_AUTH_UNADVERTISED,
378 #ifdef EXPERIMENTAL_BRIGHTMAIL
381 CONTROL_CASEFUL_LOCAL_PART,
382 CONTROL_CASELOWER_LOCAL_PART,
383 CONTROL_CUTTHROUGH_DELIVERY,
389 CONTROL_DMARC_VERIFY,
390 CONTROL_DMARC_FORENSIC,
393 CONTROL_ENFORCE_SYNC,
394 CONTROL_ERROR, /* pseudo-value for decode errors */
399 CONTROL_NO_CALLOUT_FLUSH,
400 CONTROL_NO_DELAY_FLUSH,
401 CONTROL_NO_ENFORCE_SYNC,
402 #ifdef WITH_CONTENT_SCAN
403 CONTROL_NO_MBOX_UNSPOOL,
405 CONTROL_NO_MULTILINE,
406 CONTROL_NO_PIPELINING,
410 CONTROL_SUPPRESS_LOCAL_FIXUPS,
412 CONTROL_UTF8_DOWNCONVERT,
418 /* Structure listing various control arguments, with their characteristics.
419 For each control, there's a bitmap of dis-allowed times. For some, it is easier
420 to specify the negation of a small number of allowed times. */
422 typedef struct control_def {
424 BOOL has_option; /* Has /option(s) following */
425 unsigned forbids; /* bitmap of dis-allowed times */
428 static control_def controls_list[] = {
429 /* name has_option forbids */
430 [CONTROL_AUTH_UNADVERTISED] =
431 { US"allow_auth_unadvertised", FALSE,
433 ~(ACL_BIT_CONNECT | ACL_BIT_HELO)
435 #ifdef EXPERIMENTAL_BRIGHTMAIL
437 { US"bmi_run", FALSE, 0 },
439 [CONTROL_CASEFUL_LOCAL_PART] =
440 { US"caseful_local_part", FALSE, (unsigned) ~ACL_BIT_RCPT },
441 [CONTROL_CASELOWER_LOCAL_PART] =
442 { US"caselower_local_part", FALSE, (unsigned) ~ACL_BIT_RCPT },
443 [CONTROL_CUTTHROUGH_DELIVERY] =
444 { US"cutthrough_delivery", TRUE, 0 },
446 { US"debug", TRUE, 0 },
449 [CONTROL_DKIM_VERIFY] =
450 { US"dkim_disable_verify", FALSE,
451 ACL_BIT_DATA | ACL_BIT_NOTSMTP |
452 # ifndef DISABLE_PRDR
455 ACL_BIT_NOTSMTP_START
460 [CONTROL_DMARC_VERIFY] =
461 { US"dmarc_disable_verify", FALSE,
462 ACL_BIT_DATA | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
464 [CONTROL_DMARC_FORENSIC] =
465 { US"dmarc_enable_forensic", FALSE,
466 ACL_BIT_DATA | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
472 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START | ACL_BIT_NOTQUIT
474 [CONTROL_ENFORCE_SYNC] =
475 { US"enforce_sync", FALSE,
476 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
479 /* Pseudo-value for decode errors */
481 { US"error", FALSE, 0 },
483 [CONTROL_FAKEDEFER] =
484 { US"fakedefer", TRUE,
486 ~(ACL_BIT_MAIL | ACL_BIT_RCPT |
487 ACL_BIT_PREDATA | ACL_BIT_DATA |
493 [CONTROL_FAKEREJECT] =
494 { US"fakereject", TRUE,
496 ~(ACL_BIT_MAIL | ACL_BIT_RCPT |
497 ACL_BIT_PREDATA | ACL_BIT_DATA |
506 ~(ACL_BIT_MAIL | ACL_BIT_RCPT |
507 ACL_BIT_PREDATA | ACL_BIT_DATA |
508 // ACL_BIT_PRDR| /* Not allow one user to freeze for all */
509 ACL_BIT_NOTSMTP | ACL_BIT_MIME)
512 [CONTROL_NO_CALLOUT_FLUSH] =
513 { US"no_callout_flush", FALSE,
514 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
516 [CONTROL_NO_DELAY_FLUSH] =
517 { US"no_delay_flush", FALSE,
518 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
521 [CONTROL_NO_ENFORCE_SYNC] =
522 { US"no_enforce_sync", FALSE,
523 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
525 #ifdef WITH_CONTENT_SCAN
526 [CONTROL_NO_MBOX_UNSPOOL] =
527 { US"no_mbox_unspool", FALSE,
529 ~(ACL_BIT_MAIL | ACL_BIT_RCPT |
530 ACL_BIT_PREDATA | ACL_BIT_DATA |
531 // ACL_BIT_PRDR| /* Not allow one user to freeze for all */
535 [CONTROL_NO_MULTILINE] =
536 { US"no_multiline_responses", FALSE,
537 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
539 [CONTROL_NO_PIPELINING] =
540 { US"no_pipelining", FALSE,
541 ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START
547 ~(ACL_BIT_MAIL | ACL_BIT_RCPT |
548 ACL_BIT_PREDATA | ACL_BIT_DATA |
549 // ACL_BIT_PRDR| /* Not allow one user to freeze for all */
550 ACL_BIT_NOTSMTP | ACL_BIT_MIME)
553 [CONTROL_SUBMISSION] =
554 { US"submission", TRUE,
556 ~(ACL_BIT_MAIL | ACL_BIT_RCPT | ACL_BIT_PREDATA)
558 [CONTROL_SUPPRESS_LOCAL_FIXUPS] =
559 { US"suppress_local_fixups", FALSE,
561 ~(ACL_BIT_MAIL | ACL_BIT_RCPT | ACL_BIT_PREDATA |
562 ACL_BIT_NOTSMTP_START)
565 [CONTROL_UTF8_DOWNCONVERT] =
566 { US"utf8_downconvert", TRUE, (unsigned) ~(ACL_BIT_RCPT | ACL_BIT_VRFY)
571 /* Support data structures for Client SMTP Authorization. acl_verify_csa()
572 caches its result in a tree to avoid repeated DNS queries. The result is an
573 integer code which is used as an index into the following tables of
574 explanatory strings and verification return codes. */
576 static tree_node *csa_cache = NULL;
578 enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR,
579 CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH };
581 /* The acl_verify_csa() return code is translated into an acl_verify() return
582 code using the following table. It is OK unless the client is definitely not
583 authorized. This is because CSA is supposed to be optional for sending sites,
584 so recipients should not be too strict about checking it - especially because
585 DNS problems are quite likely to occur. It's possible to use $csa_status in
586 further ACL conditions to distinguish ok, unknown, and defer if required, but
587 the aim is to make the usual configuration simple. */
589 static int csa_return_code[] = {
592 [CSA_DEFER_SRV] = OK,
593 [CSA_DEFER_ADDR] = OK,
594 [CSA_FAIL_EXPLICIT] = FAIL,
595 [CSA_FAIL_DOMAIN] = FAIL,
596 [CSA_FAIL_NOADDR] = FAIL,
597 [CSA_FAIL_MISMATCH] = FAIL
600 static uschar *csa_status_string[] = {
601 [CSA_UNKNOWN] = US"unknown",
603 [CSA_DEFER_SRV] = US"defer",
604 [CSA_DEFER_ADDR] = US"defer",
605 [CSA_FAIL_EXPLICIT] = US"fail",
606 [CSA_FAIL_DOMAIN] = US"fail",
607 [CSA_FAIL_NOADDR] = US"fail",
608 [CSA_FAIL_MISMATCH] = US"fail"
611 static uschar *csa_reason_string[] = {
612 [CSA_UNKNOWN] = US"unknown",
614 [CSA_DEFER_SRV] = US"deferred (SRV lookup failed)",
615 [CSA_DEFER_ADDR] = US"deferred (target address lookup failed)",
616 [CSA_FAIL_EXPLICIT] = US"failed (explicit authorization required)",
617 [CSA_FAIL_DOMAIN] = US"failed (host name not authorized)",
618 [CSA_FAIL_NOADDR] = US"failed (no authorized addresses)",
619 [CSA_FAIL_MISMATCH] = US"failed (client address mismatch)"
622 /* Options for the ratelimit condition. Note that there are two variants of
623 the per_rcpt option, depending on the ACL that is used to measure the rate.
624 However any ACL must be able to look up per_rcpt rates in /noupdate mode,
625 so the two variants must have the same internal representation as well as
626 the same configuration string. */
629 RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD,
630 RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS
633 #define RATE_SET(var,new) \
634 (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH))
636 static uschar *ratelimit_option_string[] = {
637 [RATE_PER_WHAT] = US"?",
638 [RATE_PER_CLASH] = US"!",
639 [RATE_PER_ADDR] = US"per_addr",
640 [RATE_PER_BYTE] = US"per_byte",
641 [RATE_PER_CMD] = US"per_cmd",
642 [RATE_PER_CONN] = US"per_conn",
643 [RATE_PER_MAIL] = US"per_mail",
644 [RATE_PER_RCPT] = US"per_rcpt",
645 [RATE_PER_ALLRCPTS] = US"per_rcpt"
648 /* Enable recursion between acl_check_internal() and acl_check_condition() */
650 static int acl_check_wargs(int, address_item *, const uschar *, uschar **,
653 static acl_block * acl_current = NULL;
656 /*************************************************
657 * Find control in list *
658 *************************************************/
660 /* The lists are always in order, so binary chop can be used.
663 name the control name to search for
664 ol the first entry in the control list
665 last one more than the offset of the last entry in the control list
667 Returns: index of a control entry, or -1 if not found
671 find_control(const uschar * name, control_def * ol, int last)
673 for (int first = 0; last > first; )
675 int middle = (first + last)/2;
676 uschar * s = ol[middle].name;
677 int c = Ustrncmp(name, s, Ustrlen(s));
678 if (c == 0) return middle;
679 else if (c > 0) first = middle + 1;
687 /*************************************************
688 * Pick out condition from list *
689 *************************************************/
691 /* Use a binary chop method
695 list list of conditions
698 Returns: offset in list, or -1 if not found
702 acl_checkcondition(uschar * name, condition_def * list, int end)
704 for (int start = 0; start < end; )
706 int mid = (start + end)/2;
707 int c = Ustrcmp(name, list[mid].name);
708 if (c == 0) return mid;
709 if (c < 0) end = mid;
710 else start = mid + 1;
716 /*************************************************
717 * Pick out name from list *
718 *************************************************/
720 /* Use a binary chop method
727 Returns: offset in list, or -1 if not found
731 acl_checkname(uschar *name, uschar **list, int end)
733 for (int start = 0; start < end; )
735 int mid = (start + end)/2;
736 int c = Ustrcmp(name, list[mid]);
737 if (c == 0) return mid;
738 if (c < 0) end = mid; else start = mid + 1;
746 acl_varname_to_cond(const uschar ** sp, acl_condition_block * cond, uschar ** error)
748 const uschar * s = *sp, * endptr;
751 if ( Ustrncmp(s, "dkim_verify_status", 18) == 0
752 || Ustrncmp(s, "dkim_verify_reason", 18) == 0)
755 if (isalnum(*endptr))
757 *error = string_sprintf("invalid variable name after \"set\" in ACL "
758 "modifier \"set %s\" "
759 "(only \"dkim_verify_status\" or \"dkim_verify_reason\" permitted)",
763 cond->u.varname = string_copyn(s, 18);
768 if (Ustrncmp(s, "acl_c", 5) != 0 && Ustrncmp(s, "acl_m", 5) != 0)
770 *error = string_sprintf("invalid variable name after \"set\" in ACL "
771 "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s);
776 if (!isdigit(*endptr) && *endptr != '_')
778 *error = string_sprintf("invalid variable name after \"set\" in ACL "
779 "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)",
784 for ( ; *endptr && *endptr != '=' && !isspace(*endptr); endptr++)
785 if (!isalnum(*endptr) && *endptr != '_')
787 *error = string_sprintf("invalid character \"%c\" in variable name "
788 "in ACL modifier \"set %s\"", *endptr, s);
792 cond->u.varname = string_copyn(s + 4, endptr - s - 4);
795 Uskip_whitespace(&s);
802 acl_data_to_cond(const uschar * s, acl_condition_block * cond,
803 const uschar * name, uschar ** error)
807 *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name,
808 conditions[cond->type].is_modifier ? US"modifier" : US"condition");
811 Uskip_whitespace(&s);
812 cond->arg = string_copy(s);
817 /*************************************************
818 * Read and parse one ACL *
819 *************************************************/
821 /* This function is called both from readconf in order to parse the ACLs in the
822 configuration file, and also when an ACL is encountered dynamically (e.g. as
823 the result of an expansion). It is given a function to call in order to
824 retrieve the lines of the ACL. This function handles skipping comments and
825 blank lines (where relevant).
828 func function to get next line of ACL
829 error where to put an error message
831 Returns: pointer to ACL, or NULL
832 NULL can be legal (empty ACL); in this case error will be NULL
836 acl_read(uschar *(*func)(void), uschar **error)
838 acl_block *yield = NULL;
839 acl_block **lastp = &yield;
840 acl_block *this = NULL;
841 acl_condition_block *cond;
842 acl_condition_block **condp = NULL;
847 while ((s = (*func)()))
850 BOOL negated = FALSE;
851 const uschar * saveline = s;
852 uschar name[EXIM_DRIVERNAME_MAX];
854 /* Conditions (but not verbs) are allowed to be negated by an initial
857 if (Uskip_whitespace(&s) == '!')
863 /* Read the name of a verb or a condition, or the start of a new ACL, which
864 can be started by a name, or by a macro definition. */
866 s = readconf_readname(name, sizeof(name), s);
867 if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield;
869 /* If a verb is unrecognized, it may be another condition or modifier that
870 continues the previous verb. */
872 if ((v = acl_checkname(name, verbs, nelem(verbs))) < 0)
876 *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name,
888 *error = string_sprintf("malformed ACL line \"%s\"", saveline);
891 *lastp = this = store_get(sizeof(acl_block), GET_UNTAINTED);
894 this->condition = NULL;
896 this->srcline = config_lineno; /* for debug output */
897 this->srcfile = config_filename; /**/
898 condp = &this->condition;
899 if (!*s) continue; /* No condition on this line */
905 s = readconf_readname(name, sizeof(name), s); /* Condition name */
908 /* Handle a condition or modifier. */
910 if ((c = acl_checkcondition(name, conditions, nelem(conditions))) < 0)
912 *error = string_sprintf("unknown ACL condition/modifier in \"%s\"",
917 /* The modifiers may not be negated */
919 if (negated && conditions[c].is_modifier)
921 *error = string_sprintf("ACL error: negation is not allowed with "
922 "\"%s\"", conditions[c].name);
926 /* ENDPASS may occur only with ACCEPT or DISCARD. */
928 if (c == ACLC_ENDPASS &&
929 this->verb != ACL_ACCEPT &&
930 this->verb != ACL_DISCARD)
932 *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"",
933 conditions[c].name, verbs[this->verb]);
937 cond = store_get(sizeof(acl_condition_block), GET_UNTAINTED);
940 cond->u.negated = negated;
945 /* The "set" modifier is different in that its argument is "name=value"
946 rather than just a value, and we can check the validity of the name, which
947 gives us a variable name to insert into the data block. The original ACL
948 variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was
949 extended to 20 of each type, but after that people successfully argued for
950 arbitrary names. In the new scheme, the names must start with acl_c or acl_m.
951 After that, we allow alphanumerics and underscores, but the first character
952 after c or m must be a digit or an underscore. This retains backwards
956 if (!acl_varname_to_cond(&s, cond, error)) return NULL;
958 /* For "set", we are now positioned for the data. For the others, only
959 "endpass" has no data */
961 if (c != ACLC_ENDPASS)
962 if (!acl_data_to_cond(s, cond, name, error)) return NULL;
970 /*************************************************
971 * Set up added header line(s) *
972 *************************************************/
974 /* This function is called by the add_header modifier, and also from acl_warn()
975 to implement the now-deprecated way of adding header lines using "message" on a
976 "warn" verb. The argument is treated as a sequence of header lines which are
977 added to a chain, provided there isn't an identical one already there.
979 Argument: string of header lines
984 setup_header(const uschar *hstring)
987 int hlen = Ustrlen(hstring);
989 /* Ignore any leading newlines */
990 while (*hstring == '\n') hstring++, hlen--;
992 /* An empty string does nothing; ensure exactly one final newline. */
993 if (hlen <= 0) return;
994 if (hstring[--hlen] != '\n') /* no newline */
995 q = string_sprintf("%s\n", hstring);
996 else if (hstring[hlen-1] == '\n') /* double newline */
998 uschar * s = string_copy(hstring);
999 while(s[--hlen] == '\n')
1006 /* Loop for multiple header lines, taking care about continuations */
1008 for (p = q; *p; p = q)
1012 int newtype = htype_add_bot;
1013 header_line **hptr = &acl_added_headers;
1015 /* Find next header line within the string */
1019 q = Ustrchr(q, '\n'); /* we know there was a newline */
1020 if (*++q != ' ' && *q != '\t') break;
1023 /* If the line starts with a colon, interpret the instruction for where to
1024 add it. This temporarily sets up a new type. */
1028 if (strncmpic(p, US":after_received:", 16) == 0)
1030 newtype = htype_add_rec;
1033 else if (strncmpic(p, US":at_start_rfc:", 14) == 0)
1035 newtype = htype_add_rfc;
1038 else if (strncmpic(p, US":at_start:", 10) == 0)
1040 newtype = htype_add_top;
1043 else if (strncmpic(p, US":at_end:", 8) == 0)
1045 newtype = htype_add_bot;
1048 while (*p == ' ' || *p == '\t') p++;
1051 /* See if this line starts with a header name, and if not, add X-ACL-Warn:
1052 to the front of it. */
1054 for (s = p; s < q - 1; s++)
1055 if (*s == ':' || !isgraph(*s)) break;
1057 hdr = string_sprintf("%s%.*s", *s == ':' ? "" : "X-ACL-Warn: ", (int) (q - p), p);
1058 hlen = Ustrlen(hdr);
1060 /* See if this line has already been added */
1064 if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break;
1065 hptr = &(*hptr)->next;
1068 /* Add if not previously present */
1072 /* The header_line struct itself is not tainted, though it points to
1073 possibly tainted data. */
1074 header_line * h = store_get(sizeof(header_line), GET_UNTAINTED);
1087 /*************************************************
1088 * List the added header lines *
1089 *************************************************/
1095 for (header_line * h = acl_added_headers; h; h = h->next)
1098 if (h->text[i-1] == '\n') i--;
1099 g = string_append_listele_n(g, '\n', h->text, i);
1102 return string_from_gstring(g);
1106 /*************************************************
1107 * Set up removed header line(s) *
1108 *************************************************/
1110 /* This function is called by the remove_header modifier. The argument is
1111 treated as a sequence of header names which are added to a colon separated
1112 list, provided there isn't an identical one already there.
1114 Argument: string of header names
1119 setup_remove_header(const uschar *hnames)
1122 acl_removed_headers = acl_removed_headers
1123 ? string_sprintf("%s : %s", acl_removed_headers, hnames)
1124 : string_copy(hnames);
1129 /*************************************************
1131 *************************************************/
1133 /* This function is called when a WARN verb's conditions are true. It adds to
1134 the message's headers, and/or writes information to the log. In each case, this
1135 only happens once (per message for headers, per connection for log).
1137 ** NOTE: The header adding action using the "message" setting is historic, and
1138 its use is now deprecated. The new add_header modifier should be used instead.
1141 where ACL_WHERE_xxxx indicating which ACL this is
1142 user_message message for adding to headers
1143 log_message message for logging, if different
1149 acl_warn(int where, uschar *user_message, uschar *log_message)
1151 if (log_message != NULL && log_message != user_message)
1154 string_item *logged;
1156 text = string_sprintf("%s Warning: %s", host_and_ident(TRUE),
1157 string_printing(log_message));
1159 /* If a sender verification has failed, and the log message is "sender verify
1160 failed", add the failure message. */
1162 if (sender_verified_failed != NULL &&
1163 sender_verified_failed->message != NULL &&
1164 strcmpic(log_message, US"sender verify failed") == 0)
1165 text = string_sprintf("%s: %s", text, sender_verified_failed->message);
1167 /* Search previously logged warnings. They are kept in malloc
1168 store so they can be freed at the start of a new message. */
1170 for (logged = acl_warn_logged; logged; logged = logged->next)
1171 if (Ustrcmp(logged->text, text) == 0) break;
1175 int length = Ustrlen(text) + 1;
1176 log_write(0, LOG_MAIN, "%s", text);
1177 logged = store_malloc(sizeof(string_item) + length);
1178 logged->text = US logged + sizeof(string_item);
1179 memcpy(logged->text, text, length);
1180 logged->next = acl_warn_logged;
1181 acl_warn_logged = logged;
1185 /* If there's no user message, we are done. */
1187 if (!user_message) return;
1189 /* If this isn't a message ACL, we can't do anything with a user message.
1192 if (where > ACL_WHERE_NOTSMTP)
1194 log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting "
1195 "found in a non-message (%s) ACL: cannot specify header lines here: "
1196 "message ignored", acl_wherenames[where]);
1200 /* The code for setting up header lines is now abstracted into a separate
1201 function so that it can be used for the add_header modifier as well. */
1203 setup_header(user_message);
1208 /*************************************************
1209 * Verify and check reverse DNS *
1210 *************************************************/
1212 /* Called from acl_verify() below. We look up the host name(s) of the client IP
1213 address if this has not yet been done. The host_name_lookup() function checks
1214 that one of these names resolves to an address list that contains the client IP
1215 address, so we don't actually have to do the check here.
1218 user_msgptr pointer for user message
1219 log_msgptr pointer for log message
1221 Returns: OK verification condition succeeded
1222 FAIL verification failed
1223 DEFER there was a problem verifying
1227 acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr)
1231 /* Previous success */
1233 if (sender_host_name) return OK;
1235 /* Previous failure */
1237 if (host_lookup_failed)
1239 *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg);
1243 /* Need to do a lookup */
1246 debug_printf_indent("looking up host name to force name/address consistency check\n");
1248 if ((rc = host_name_lookup()) != OK)
1250 *log_msgptr = rc == DEFER
1251 ? US"host lookup deferred for reverse lookup check"
1252 : string_sprintf("host lookup failed for reverse lookup check%s",
1254 return rc; /* DEFER or FAIL */
1257 host_build_sender_fullhost();
1263 /*************************************************
1264 * Check client IP address matches CSA target *
1265 *************************************************/
1267 /* Called from acl_verify_csa() below. This routine scans a section of a DNS
1268 response for address records belonging to the CSA target hostname. The section
1269 is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS.
1270 If one of the addresses matches the client's IP address, then the client is
1271 authorized by CSA. If there are target IP addresses but none of them match
1272 then the client is using an unauthorized IP address. If there are no target IP
1273 addresses then the client cannot be using an authorized IP address. (This is
1274 an odd configuration - why didn't the SRV record have a weight of 1 instead?)
1277 dnsa the DNS answer block
1278 dnss a DNS scan block for us to use
1279 reset option specifying what portion to scan, as described above
1280 target the target hostname to use for matching RR names
1282 Returns: CSA_OK successfully authorized
1283 CSA_FAIL_MISMATCH addresses found but none matched
1284 CSA_FAIL_NOADDR no target addresses found
1288 acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset,
1291 int rc = CSA_FAIL_NOADDR;
1293 for (dns_record * rr = dns_next_rr(dnsa, dnss, reset);
1295 rr = dns_next_rr(dnsa, dnss, RESET_NEXT))
1297 /* Check this is an address RR for the target hostname. */
1301 && rr->type != T_AAAA
1305 if (strcmpic(target, rr->name) != 0) continue;
1307 rc = CSA_FAIL_MISMATCH;
1309 /* Turn the target address RR into a list of textual IP addresses and scan
1310 the list. There may be more than one if it is an A6 RR. */
1312 for (dns_address * da = dns_address_from_rr(dnsa, rr); da; da = da->next)
1314 /* If the client IP address matches the target IP address, it's good! */
1316 DEBUG(D_acl) debug_printf_indent("CSA target address is %s\n", da->address);
1318 if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK;
1322 /* If we found some target addresses but none of them matched, the client is
1323 using an unauthorized IP address, otherwise the target has no authorized IP
1331 /*************************************************
1332 * Verify Client SMTP Authorization *
1333 *************************************************/
1335 /* Called from acl_verify() below. This routine calls dns_lookup_special()
1336 to find the CSA SRV record corresponding to the domain argument, or
1337 $sender_helo_name if no argument is provided. It then checks that the
1338 client is authorized, and that its IP address corresponds to the SRV
1339 target's address by calling acl_verify_csa_address() above. The address
1340 should have been returned in the DNS response's ADDITIONAL section, but if
1341 not we perform another DNS lookup to get it.
1344 domain pointer to optional parameter following verify = csa
1346 Returns: CSA_UNKNOWN no valid CSA record found
1347 CSA_OK successfully authorized
1348 CSA_FAIL_* client is definitely not authorized
1349 CSA_DEFER_* there was a DNS problem
1353 acl_verify_csa(const uschar *domain)
1356 const uschar *found;
1357 int priority, weight, port;
1361 int rc, type, yield;
1362 #define TARGET_SIZE 256
1363 uschar * target = store_get(TARGET_SIZE, GET_TAINTED);
1365 /* Work out the domain we are using for the CSA lookup. The default is the
1366 client's HELO domain. If the client has not said HELO, use its IP address
1367 instead. If it's a local client (exim -bs), CSA isn't applicable. */
1369 while (isspace(*domain) && *domain != '\0') ++domain;
1370 if (*domain == '\0') domain = sender_helo_name;
1371 if (!domain) domain = sender_host_address;
1372 if (!sender_host_address) return CSA_UNKNOWN;
1374 /* If we have an address literal, strip off the framing ready for turning it
1375 into a domain. The framing consists of matched square brackets possibly
1376 containing a keyword and a colon before the actual IP address. */
1378 if (domain[0] == '[')
1380 const uschar *start = Ustrchr(domain, ':');
1381 if (start == NULL) start = domain;
1382 domain = string_copyn(start + 1, Ustrlen(start) - 2);
1385 /* Turn domains that look like bare IP addresses into domains in the reverse
1386 DNS. This code also deals with address literals and $sender_host_address. It's
1387 not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as
1388 address literals, but it's probably the most friendly thing to do. This is an
1389 extension to CSA, so we allow it to be turned off for proper conformance. */
1391 if (string_is_ip_address(domain, NULL) != 0)
1393 if (!dns_csa_use_reverse) return CSA_UNKNOWN;
1394 domain = dns_build_reverse(domain);
1397 /* Find out if we've already done the CSA check for this domain. If we have,
1398 return the same result again. Otherwise build a new cached result structure
1399 for this domain. The name is filled in now, and the value is filled in when
1400 we return from this function. */
1402 if ((t = tree_search(csa_cache, domain)))
1405 t = store_get_perm(sizeof(tree_node) + Ustrlen(domain), domain);
1406 Ustrcpy(t->name, domain);
1407 (void)tree_insertnode(&csa_cache, t);
1409 /* Now we are ready to do the actual DNS lookup(s). */
1412 dnsa = store_get_dns_answer();
1413 switch (dns_special_lookup(dnsa, domain, T_CSA, &found))
1415 /* If something bad happened (most commonly DNS_AGAIN), defer. */
1418 yield = CSA_DEFER_SRV;
1421 /* If we found nothing, the client's authorization is unknown. */
1425 yield = CSA_UNKNOWN;
1428 /* We got something! Go on to look at the reply in more detail. */
1434 /* Scan the reply for well-formed CSA SRV records. */
1436 for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
1438 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == T_SRV)
1440 const uschar * p = rr->data;
1442 /* Extract the numerical SRV fields (p is incremented) */
1444 GETSHORT(priority, p);
1445 GETSHORT(weight, p);
1449 debug_printf_indent("CSA priority=%d weight=%d port=%d\n", priority, weight, port);
1451 /* Check the CSA version number */
1453 if (priority != 1) continue;
1455 /* If the domain does not have a CSA SRV record of its own (i.e. the domain
1456 found by dns_special_lookup() is a parent of the one we asked for), we check
1457 the subdomain assertions in the port field. At the moment there's only one
1458 assertion: legitimate SMTP clients are all explicitly authorized with CSA
1459 SRV records of their own. */
1461 if (Ustrcmp(found, domain) != 0)
1463 yield = port & 1 ? CSA_FAIL_EXPLICIT : CSA_UNKNOWN;
1467 /* This CSA SRV record refers directly to our domain, so we check the value
1468 in the weight field to work out the domain's authorization. 0 and 1 are
1469 unauthorized; 3 means the client is authorized but we can't check the IP
1470 address in order to authenticate it, so we treat it as unknown; values
1471 greater than 3 are undefined. */
1475 yield = CSA_FAIL_DOMAIN;
1479 if (weight > 2) continue;
1481 /* Weight == 2, which means the domain is authorized. We must check that the
1482 client's IP address is listed as one of the SRV target addresses. Save the
1483 target hostname then break to scan the additional data for its addresses. */
1485 (void)dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, p,
1486 (DN_EXPAND_ARG4_TYPE)target, TARGET_SIZE);
1488 DEBUG(D_acl) debug_printf_indent("CSA target is %s\n", target);
1493 /* If we didn't break the loop then no appropriate records were found. */
1497 yield = CSA_UNKNOWN;
1501 /* Do not check addresses if the target is ".", in accordance with RFC 2782.
1502 A target of "." indicates there are no valid addresses, so the client cannot
1503 be authorized. (This is an odd configuration because weight=2 target=. is
1504 equivalent to weight=1, but we check for it in order to keep load off the
1505 root name servers.) Note that dn_expand() turns "." into "". */
1507 if (Ustrcmp(target, "") == 0)
1509 yield = CSA_FAIL_NOADDR;
1513 /* Scan the additional section of the CSA SRV reply for addresses belonging
1514 to the target. If the name server didn't return any additional data (e.g.
1515 because it does not fully support SRV records), we need to do another lookup
1516 to obtain the target addresses; otherwise we have a definitive result. */
1518 rc = acl_verify_csa_address(dnsa, &dnss, RESET_ADDITIONAL, target);
1519 if (rc != CSA_FAIL_NOADDR)
1525 /* The DNS lookup type corresponds to the IP version used by the client. */
1528 if (Ustrchr(sender_host_address, ':') != NULL)
1531 #endif /* HAVE_IPV6 */
1535 lookup_dnssec_authenticated = NULL;
1536 switch (dns_lookup(dnsa, target, type, NULL))
1538 /* If something bad happened (most commonly DNS_AGAIN), defer. */
1541 yield = CSA_DEFER_ADDR;
1544 /* If the query succeeded, scan the addresses and return the result. */
1547 rc = acl_verify_csa_address(dnsa, &dnss, RESET_ANSWERS, target);
1548 if (rc != CSA_FAIL_NOADDR)
1553 /* else fall through */
1555 /* If the target has no IP addresses, the client cannot have an authorized
1556 IP address. However, if the target site uses A6 records (not AAAA records)
1557 we have to do yet another lookup in order to check them. */
1561 yield = CSA_FAIL_NOADDR;
1567 store_free_dns_answer(dnsa);
1568 return t->data.val = yield;
1573 /*************************************************
1574 * Handle verification (address & other) *
1575 *************************************************/
1577 enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX,
1578 VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT,
1579 VERIFY_HDR_NAMES_ASCII, VERIFY_ARC
1584 unsigned where_allowed; /* bitmap */
1585 BOOL no_options; /* Never has /option(s) following */
1586 unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */
1588 static verify_type_t verify_type_list[] = {
1589 /* name value where no-opt opt-sep */
1590 { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, (unsigned)~0, FALSE, 0 },
1591 { US"certificate", VERIFY_CERT, (unsigned)~0, TRUE, 0 },
1592 { US"helo", VERIFY_HELO, (unsigned)~0, TRUE, 0 },
1593 { US"csa", VERIFY_CSA, (unsigned)~0, FALSE, 0 },
1594 { US"header_syntax", VERIFY_HDR_SYNTAX, ACL_BITS_HAVEDATA, TRUE, 0 },
1595 { US"not_blind", VERIFY_NOT_BLIND, ACL_BITS_HAVEDATA, FALSE, 0 },
1596 { US"header_sender", VERIFY_HDR_SNDR, ACL_BITS_HAVEDATA, FALSE, 0 },
1597 { US"sender", VERIFY_SNDR, ACL_BIT_MAIL | ACL_BIT_RCPT
1598 | ACL_BIT_PREDATA | ACL_BIT_DATA | ACL_BIT_NOTSMTP,
1600 { US"recipient", VERIFY_RCPT, ACL_BIT_RCPT, FALSE, 0 },
1601 { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, ACL_BITS_HAVEDATA, TRUE, 0 },
1602 #ifdef EXPERIMENTAL_ARC
1603 { US"arc", VERIFY_ARC, ACL_BIT_DATA, FALSE , 0 },
1608 enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER,
1609 CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER,
1610 CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT,
1611 CALLOUT_HOLD, CALLOUT_TIME /* TIME must be last */
1617 BOOL has_option; /* Has =option(s) following */
1618 BOOL timeval; /* Has a time value */
1620 static callout_opt_t callout_opt_list[] = {
1621 /* name value flag has-opt has-time */
1622 { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE },
1623 { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE },
1624 { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE },
1625 { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE },
1626 { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE },
1627 { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE },
1628 { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE },
1629 { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE },
1630 { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE },
1631 { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE },
1632 { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE },
1633 { US"hold", CALLOUT_HOLD, vopt_callout_hold, FALSE, FALSE },
1634 { NULL, CALLOUT_TIME, 0, FALSE, TRUE }
1640 v_period(const uschar * s, const uschar * arg, uschar ** log_msgptr)
1643 if ((period = readconf_readtime(s, 0, FALSE)) < 0)
1645 *log_msgptr = string_sprintf("bad time value in ACL condition "
1646 "\"verify %s\"", arg);
1654 sender_helo_verified_internal(void)
1656 /* We can test the result of optional HELO verification that might have
1657 occurred earlier. If not, we can attempt the verification now. */
1659 if (!f.helo_verified && !f.helo_verify_failed) smtp_verify_helo();
1660 return f.helo_verified;
1664 sender_helo_verified_cond(void)
1666 return sender_helo_verified_internal() ? OK : FAIL;
1670 sender_helo_verified_boolstr(void)
1672 return sender_helo_verified_internal() ? US"yes" : US"no";
1677 /* This function implements the "verify" condition. It is called when
1678 encountered in any ACL, because some tests are almost always permitted. Some
1679 just don't make sense, and always fail (for example, an attempt to test a host
1680 lookup for a non-TCP/IP message). Others are restricted to certain ACLs.
1683 where where called from
1684 addr the recipient address that the ACL is handling, or NULL
1685 arg the argument of "verify"
1686 user_msgptr pointer for user message
1687 log_msgptr pointer for log message
1688 basic_errno where to put verify errno
1690 Returns: OK verification condition succeeded
1691 FAIL verification failed
1692 DEFER there was a problem verifying
1697 acl_verify(int where, address_item *addr, const uschar *arg,
1698 uschar **user_msgptr, uschar **log_msgptr, int *basic_errno)
1702 int callout_overall = -1;
1703 int callout_connect = -1;
1704 int verify_options = 0;
1706 BOOL verify_header_sender = FALSE;
1707 BOOL defer_ok = FALSE;
1708 BOOL callout_defer_ok = FALSE;
1709 BOOL no_details = FALSE;
1710 BOOL success_on_redirect = FALSE;
1712 int quota_pos_cache = QUOTA_POS_DEFAULT, quota_neg_cache = QUOTA_NEG_DEFAULT;
1713 address_item *sender_vaddr = NULL;
1714 uschar *verify_sender_address = NULL;
1715 uschar *pm_mailfrom = NULL;
1716 uschar *se_mailfrom = NULL;
1718 /* Some of the verify items have slash-separated options; some do not. Diagnose
1719 an error if options are given for items that don't expect them.
1722 uschar *slash = Ustrchr(arg, '/');
1723 const uschar *list = arg;
1724 uschar *ss = string_nextinlist(&list, &sep, NULL, 0);
1727 if (!ss) goto BAD_VERIFY;
1729 /* Handle name/address consistency verification in a separate function. */
1731 for (vp = verify_type_list;
1732 CS vp < CS verify_type_list + sizeof(verify_type_list);
1735 if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0
1736 : strcmpic (ss, vp->name) == 0)
1738 if (CS vp >= CS verify_type_list + sizeof(verify_type_list))
1741 if (vp->no_options && slash)
1743 *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" "
1744 "(this verify item has no options)", arg);
1747 if (!(vp->where_allowed & BIT(where)))
1749 *log_msgptr = string_sprintf("cannot verify %s in ACL for %s",
1750 vp->name, acl_wherenames[where]);
1755 case VERIFY_REV_HOST_LKUP:
1756 if (!sender_host_address) return OK;
1757 if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER)
1758 while ((ss = string_nextinlist(&list, &sep, NULL, 0)))
1759 if (strcmpic(ss, US"defer_ok") == 0)
1764 /* TLS certificate verification is done at STARTTLS time; here we just
1765 test whether it was successful or not. (This is for optional verification; for
1766 mandatory verification, the connection doesn't last this long.) */
1768 if (tls_in.certificate_verified) return OK;
1769 *user_msgptr = US"no verified certificate";
1773 return sender_helo_verified_cond();
1776 /* Do Client SMTP Authorization checks in a separate function, and turn the
1777 result code into user-friendly strings. */
1779 rc = acl_verify_csa(list);
1780 *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s",
1781 csa_reason_string[rc]);
1782 csa_status = csa_status_string[rc];
1783 DEBUG(D_acl) debug_printf_indent("CSA result %s\n", csa_status);
1784 return csa_return_code[rc];
1786 #ifdef EXPERIMENTAL_ARC
1788 { /* Do Authenticated Received Chain checks in a separate function. */
1789 const uschar * condlist = CUS string_nextinlist(&list, &sep, NULL, 0);
1793 if (!(arc_state = acl_verify_arc())) return DEFER;
1794 DEBUG(D_acl) debug_printf_indent("ARC verify result %s %s%s%s\n", arc_state,
1795 arc_state_reason ? "(":"", arc_state_reason, arc_state_reason ? ")":"");
1797 if (!condlist) condlist = US"none:pass";
1798 while ((cond = string_nextinlist(&condlist, &csep, NULL, 0)))
1799 if (Ustrcmp(arc_state, cond) == 0) return OK;
1804 case VERIFY_HDR_SYNTAX:
1805 /* Check that all relevant header lines have the correct 5322-syntax. If there is
1806 a syntax error, we return details of the error to the sender if configured to
1807 send out full details. (But a "message" setting on the ACL can override, as
1810 rc = verify_check_headers(log_msgptr);
1811 if (rc != OK && *log_msgptr)
1812 if (smtp_return_error_details)
1813 *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
1815 acl_verify_message = *log_msgptr;
1818 case VERIFY_HDR_NAMES_ASCII:
1819 /* Check that all header names are true 7 bit strings
1820 See RFC 5322, 2.2. and RFC 6532, 3. */
1822 rc = verify_check_header_names_ascii(log_msgptr);
1823 if (rc != OK && smtp_return_error_details && *log_msgptr)
1824 *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
1827 case VERIFY_NOT_BLIND:
1828 /* Check that no recipient of this message is "blind", that is, every envelope
1829 recipient must be mentioned in either To: or Cc:. */
1831 BOOL case_sensitive = TRUE;
1833 while ((ss = string_nextinlist(&list, &sep, NULL, 0)))
1834 if (strcmpic(ss, US"case_insensitive") == 0)
1835 case_sensitive = FALSE;
1838 *log_msgptr = string_sprintf("unknown option \"%s\" in ACL "
1839 "condition \"verify %s\"", ss, arg);
1843 if ((rc = verify_check_notblind(case_sensitive)) != OK)
1845 *log_msgptr = US"bcc recipient detected";
1846 if (smtp_return_error_details)
1847 *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
1852 /* The remaining verification tests check recipient and sender addresses,
1853 either from the envelope or from the header. There are a number of
1854 slash-separated options that are common to all of them. */
1856 case VERIFY_HDR_SNDR:
1857 verify_header_sender = TRUE;
1861 /* In the case of a sender, this can optionally be followed by an address to use
1862 in place of the actual sender (rare special-case requirement). */
1866 verify_sender_address = sender_address;
1869 while (isspace(*s)) s++;
1870 if (*s++ != '=') goto BAD_VERIFY;
1871 while (isspace(*s)) s++;
1872 verify_sender_address = string_copy(s);
1883 /* Remaining items are optional; they apply to sender and recipient
1884 verification, including "header sender" verification. */
1886 while ((ss = string_nextinlist(&list, &sep, NULL, 0)))
1888 if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE;
1889 else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE;
1890 else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE;
1892 /* These two old options are left for backwards compatibility */
1894 else if (strcmpic(ss, US"callout_defer_ok") == 0)
1896 callout_defer_ok = TRUE;
1897 if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT;
1900 else if (strcmpic(ss, US"check_postmaster") == 0)
1903 if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT;
1906 /* The callout option has a number of sub-options, comma separated */
1908 else if (strncmpic(ss, US"callout", 7) == 0)
1910 callout = CALLOUT_TIMEOUT_DEFAULT;
1913 while (isspace(*ss)) ss++;
1916 const uschar * sublist = ss;
1919 while (isspace(*sublist)) sublist++;
1920 for (uschar * opt; opt = string_nextinlist(&sublist, &optsep, NULL, 0); )
1923 double period = 1.0F;
1925 for (op= callout_opt_list; op->name; op++)
1926 if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0)
1929 verify_options |= op->flag;
1932 opt += Ustrlen(op->name);
1933 while (isspace(*opt)) opt++;
1936 *log_msgptr = string_sprintf("'=' expected after "
1937 "\"%s\" in ACL verify condition \"%s\"", op->name, arg);
1940 while (isspace(*opt)) opt++;
1942 if (op->timeval && (period = v_period(opt, arg, log_msgptr)) < 0)
1947 case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break;
1948 case CALLOUT_POSTMASTER: pm_mailfrom = US""; break;
1949 case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break;
1950 case CALLOUT_MAILFROM:
1951 if (!verify_header_sender)
1953 *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a "
1954 "callout option only for verify=header_sender (detected in ACL "
1955 "condition \"%s\")", arg);
1958 se_mailfrom = string_copy(opt);
1960 case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break;
1961 case CALLOUT_MAXWAIT: callout_overall = period; break;
1962 case CALLOUT_CONNECT: callout_connect = period; break;
1963 case CALLOUT_TIME: callout = period; break;
1969 *log_msgptr = string_sprintf("'=' expected after \"callout\" in "
1970 "ACL condition \"%s\"", arg);
1976 /* The quota option has sub-options, comma-separated */
1978 else if (strncmpic(ss, US"quota", 5) == 0)
1983 while (isspace(*ss)) ss++;
1986 const uschar * sublist = ss;
1990 while (isspace(*sublist)) sublist++;
1991 for (uschar * opt; opt = string_nextinlist(&sublist, &optsep, NULL, 0); )
1992 if (Ustrncmp(opt, "cachepos=", 9) == 0)
1993 if ((period = v_period(opt += 9, arg, log_msgptr)) < 0)
1996 quota_pos_cache = period;
1997 else if (Ustrncmp(opt, "cacheneg=", 9) == 0)
1998 if ((period = v_period(opt += 9, arg, log_msgptr)) < 0)
2001 quota_neg_cache = period;
2002 else if (Ustrcmp(opt, "no_cache") == 0)
2003 quota_pos_cache = quota_neg_cache = 0;
2008 /* Option not recognized */
2012 *log_msgptr = string_sprintf("unknown option \"%s\" in ACL "
2013 "condition \"verify %s\"", ss, arg);
2018 if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) ==
2019 (vopt_callout_recipsender|vopt_callout_recippmaster))
2021 *log_msgptr = US"only one of use_sender and use_postmaster can be set "
2022 "for a recipient callout";
2026 /* Handle quota verification */
2029 if (vp->value != VERIFY_RCPT)
2031 *log_msgptr = US"can only verify quota of recipient";
2035 if ((rc = verify_quota_call(addr->address,
2036 quota_pos_cache, quota_neg_cache, log_msgptr)) != OK)
2038 *basic_errno = errno;
2039 if (smtp_return_error_details)
2041 if (!*user_msgptr && *log_msgptr)
2042 *user_msgptr = string_sprintf("Rejected after %s: %s",
2043 smtp_names[smtp_connection_had[SMTP_HBUFF_PREV(smtp_ch_index)]],
2045 if (rc == DEFER) f.acl_temp_details = TRUE;
2052 /* Handle sender-in-header verification. Default the user message to the log
2053 message if giving out verification details. */
2055 if (verify_header_sender)
2059 if ((rc = verify_check_header_address(user_msgptr, log_msgptr, callout,
2060 callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options,
2063 *basic_errno = verrno;
2064 if (smtp_return_error_details)
2066 if (!*user_msgptr && *log_msgptr)
2067 *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
2068 if (rc == DEFER) f.acl_temp_details = TRUE;
2073 /* Handle a sender address. The default is to verify *the* sender address, but
2074 optionally a different address can be given, for special requirements. If the
2075 address is empty, we are dealing with a bounce message that has no sender, so
2076 we cannot do any checking. If the real sender address gets rewritten during
2077 verification (e.g. DNS widening), set the flag to stop it being rewritten again
2078 during message reception.
2080 A list of verified "sender" addresses is kept to try to avoid doing to much
2081 work repetitively when there are multiple recipients in a message and they all
2082 require sender verification. However, when callouts are involved, it gets too
2083 complicated because different recipients may require different callout options.
2084 Therefore, we always do a full sender verify when any kind of callout is
2085 specified. Caching elsewhere, for instance in the DNS resolver and in the
2086 callout handling, should ensure that this is not terribly inefficient. */
2088 else if (verify_sender_address)
2090 if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)))
2092 *log_msgptr = US"use_sender or use_postmaster cannot be used for a "
2093 "sender verify callout";
2097 sender_vaddr = verify_checked_sender(verify_sender_address);
2098 if ( sender_vaddr /* Previously checked */
2099 && callout <= 0) /* No callout needed this time */
2101 /* If the "routed" flag is set, it means that routing worked before, so
2102 this check can give OK (the saved return code value, if set, belongs to a
2103 callout that was done previously). If the "routed" flag is not set, routing
2104 must have failed, so we use the saved return code. */
2106 if (testflag(sender_vaddr, af_verify_routed))
2110 rc = sender_vaddr->special_action;
2111 *basic_errno = sender_vaddr->basic_errno;
2113 HDEBUG(D_acl) debug_printf_indent("using cached sender verify result\n");
2116 /* Do a new verification, and cache the result. The cache is used to avoid
2117 verifying the sender multiple times for multiple RCPTs when callouts are not
2118 specified (see comments above).
2120 The cache is also used on failure to give details in response to the first
2121 RCPT that gets bounced for this reason. However, this can be suppressed by
2122 the no_details option, which sets the flag that says "this detail has already
2123 been sent". The cache normally contains just one address, but there may be
2124 more in esoteric circumstances. */
2129 uschar *save_address_data = deliver_address_data;
2131 sender_vaddr = deliver_make_addr(verify_sender_address, TRUE);
2133 if ((sender_vaddr->prop.utf8_msg = message_smtputf8))
2135 sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1;
2136 sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1;
2139 if (no_details) setflag(sender_vaddr, af_sverify_told);
2140 if (verify_sender_address[0] != 0)
2142 /* If this is the real sender address, save the unrewritten version
2143 for use later in receive. Otherwise, set a flag so that rewriting the
2144 sender in verify_address() does not update sender_address. */
2146 if (verify_sender_address == sender_address)
2147 sender_address_unrewritten = sender_address;
2149 verify_options |= vopt_fake_sender;
2151 if (success_on_redirect)
2152 verify_options |= vopt_success_on_redirect;
2154 /* The recipient, qualify, and expn options are never set in
2157 rc = verify_address(sender_vaddr, NULL, verify_options, callout,
2158 callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed);
2160 HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n");
2163 *basic_errno = sender_vaddr->basic_errno;
2166 if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0)
2167 debug_printf_indent("sender %s verified ok as %s\n",
2168 verify_sender_address, sender_vaddr->address);
2170 debug_printf_indent("sender %s verified ok\n",
2171 verify_sender_address);
2174 rc = OK; /* Null sender */
2176 /* Cache the result code */
2178 if (routed) setflag(sender_vaddr, af_verify_routed);
2179 if (callout > 0) setflag(sender_vaddr, af_verify_callout);
2180 sender_vaddr->special_action = rc;
2181 sender_vaddr->next = sender_verified_list;
2182 sender_verified_list = sender_vaddr;
2184 /* Restore the recipient address data, which might have been clobbered by
2185 the sender verification. */
2187 deliver_address_data = save_address_data;
2190 /* Put the sender address_data value into $sender_address_data */
2192 sender_address_data = sender_vaddr->prop.address_data;
2195 /* A recipient address just gets a straightforward verify; again we must handle
2196 the DEFER overrides. */
2202 if (success_on_redirect)
2203 verify_options |= vopt_success_on_redirect;
2205 /* We must use a copy of the address for verification, because it might
2209 rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout,
2210 callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL);
2211 HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n");
2213 *basic_errno = addr2.basic_errno;
2214 *log_msgptr = addr2.message;
2215 *user_msgptr = addr2.user_message ? addr2.user_message : addr2.message;
2217 /* Allow details for temporary error if the address is so flagged. */
2218 if (testflag((&addr2), af_pass_message)) f.acl_temp_details = TRUE;
2220 /* Make $address_data visible */
2221 deliver_address_data = addr2.prop.address_data;
2224 /* We have a result from the relevant test. Handle defer overrides first. */
2228 || callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER
2231 HDEBUG(D_acl) debug_printf_indent("verify defer overridden by %s\n",
2232 defer_ok? "defer_ok" : "callout_defer_ok");
2236 /* If we've failed a sender, set up a recipient message, and point
2237 sender_verified_failed to the address item that actually failed. */
2239 if (rc != OK && verify_sender_address)
2242 *log_msgptr = *user_msgptr = US"Sender verify failed";
2243 else if (*basic_errno != ERRNO_CALLOUTDEFER)
2244 *log_msgptr = *user_msgptr = US"Could not complete sender verify";
2247 *log_msgptr = US"Could not complete sender verify callout";
2248 *user_msgptr = smtp_return_error_details? sender_vaddr->user_message :
2252 sender_verified_failed = sender_vaddr;
2255 /* Verifying an address messes up the values of $domain and $local_part,
2256 so reset them before returning if this is a RCPT ACL. */
2260 deliver_domain = addr->domain;
2261 deliver_localpart = addr->local_part;
2265 /* Syntax errors in the verify argument come here. */
2268 *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", "
2269 "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" "
2270 "or \"reverse_host_lookup\" at start of ACL condition "
2271 "\"verify %s\"", arg);
2278 /*************************************************
2279 * Check argument for control= modifier *
2280 *************************************************/
2282 /* Called from acl_check_condition() below.
2283 To handle the case "queue_only" we accept an _ in the
2284 initial / option-switch position.
2287 arg the argument string for control=
2288 pptr set to point to the terminating character
2289 where which ACL we are in
2290 log_msgptr for error messages
2292 Returns: CONTROL_xxx value
2296 decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr)
2302 if ( (idx = find_control(arg, controls_list, nelem(controls_list))) < 0
2303 || ( (c = arg[len = Ustrlen((d = controls_list+idx)->name)]) != 0
2304 && (!d->has_option || c != '/' && c != '_')
2307 *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
2308 return CONTROL_ERROR;
2318 /*************************************************
2319 * Return a ratelimit error *
2320 *************************************************/
2322 /* Called from acl_ratelimit() below
2325 log_msgptr for error messages
2326 format format string
2327 ... supplementary arguments
2333 ratelimit_error(uschar **log_msgptr, const char *format, ...)
2337 string_cat(NULL, US"error in arguments to \"ratelimit\" condition: ");
2339 va_start(ap, format);
2340 g = string_vformat(g, SVFMT_EXTEND|SVFMT_REBUFFER, format, ap);
2343 gstring_release_unused(g);
2344 *log_msgptr = string_from_gstring(g);
2351 /*************************************************
2352 * Handle rate limiting *
2353 *************************************************/
2355 /* Called by acl_check_condition() below to calculate the result
2356 of the ACL ratelimit condition.
2358 Note that the return value might be slightly unexpected: if the
2359 sender's rate is above the limit then the result is OK. This is
2360 similar to the dnslists condition, and is so that you can write
2361 ACL clauses like: defer ratelimit = 15 / 1h
2364 arg the option string for ratelimit=
2365 where ACL_WHERE_xxxx indicating which ACL this is
2366 log_msgptr for error messages
2368 Returns: OK - Sender's rate is above limit
2369 FAIL - Sender's rate is below limit
2370 DEFER - Problem opening ratelimit database
2371 ERROR - Syntax error in options.
2375 acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr)
2377 double limit, period, count;
2380 uschar *unique = NULL;
2382 BOOL leaky = FALSE, strict = FALSE, readonly = FALSE;
2383 BOOL noupdate = FALSE, badacl = FALSE;
2384 int mode = RATE_PER_WHAT;
2386 tree_node **anchor, *t;
2387 open_db dbblock, *dbm;
2389 dbdata_ratelimit *dbd;
2390 dbdata_ratelimit_unique *dbdb;
2393 /* Parse the first two options and record their values in expansion
2394 variables. These variables allow the configuration to have informative
2395 error messages based on rate limits obtained from a table lookup. */
2397 /* First is the maximum number of messages per period / maximum burst
2398 size, which must be greater than or equal to zero. Zero is useful for
2399 rate measurement as opposed to rate limiting. */
2401 if (!(sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0)))
2402 return ratelimit_error(log_msgptr, "sender rate limit not set");
2404 limit = Ustrtod(sender_rate_limit, &ss);
2405 if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; }
2406 else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; }
2407 else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; }
2409 if (limit < 0.0 || *ss != '\0')
2410 return ratelimit_error(log_msgptr,
2411 "\"%s\" is not a positive number", sender_rate_limit);
2413 /* Second is the rate measurement period / exponential smoothing time
2414 constant. This must be strictly greater than zero, because zero leads to
2415 run-time division errors. */
2417 period = !(sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0))
2418 ? -1.0 : readconf_readtime(sender_rate_period, 0, FALSE);
2420 return ratelimit_error(log_msgptr,
2421 "\"%s\" is not a time value", sender_rate_period);
2423 /* By default we are counting one of something, but the per_rcpt,
2424 per_byte, and count options can change this. */
2428 /* Parse the other options. */
2430 while ((ss = string_nextinlist(&arg, &sep, NULL, 0)))
2432 if (strcmpic(ss, US"leaky") == 0) leaky = TRUE;
2433 else if (strcmpic(ss, US"strict") == 0) strict = TRUE;
2434 else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE;
2435 else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE;
2436 else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD);
2437 else if (strcmpic(ss, US"per_conn") == 0)
2439 RATE_SET(mode, PER_CONN);
2440 if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START)
2443 else if (strcmpic(ss, US"per_mail") == 0)
2445 RATE_SET(mode, PER_MAIL);
2446 if (where > ACL_WHERE_NOTSMTP) badacl = TRUE;
2448 else if (strcmpic(ss, US"per_rcpt") == 0)
2450 /* If we are running in the RCPT ACL, then we'll count the recipients
2451 one by one, but if we are running when we have accumulated the whole
2452 list then we'll add them all in one batch. */
2453 if (where == ACL_WHERE_RCPT)
2454 RATE_SET(mode, PER_RCPT);
2455 else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP)
2456 RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count;
2457 else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP)
2458 RATE_SET(mode, PER_RCPT), badacl = TRUE;
2460 else if (strcmpic(ss, US"per_byte") == 0)
2462 /* If we have not yet received the message data and there was no SIZE
2463 declaration on the MAIL command, then it's safe to just use a value of
2464 zero and let the recorded rate decay as if nothing happened. */
2465 RATE_SET(mode, PER_MAIL);
2466 if (where > ACL_WHERE_NOTSMTP) badacl = TRUE;
2467 else count = message_size < 0 ? 0.0 : (double)message_size;
2469 else if (strcmpic(ss, US"per_addr") == 0)
2471 RATE_SET(mode, PER_RCPT);
2472 if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*";
2473 else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain);
2475 else if (strncmpic(ss, US"count=", 6) == 0)
2478 count = Ustrtod(ss+6, &e);
2479 if (count < 0.0 || *e != '\0')
2480 return ratelimit_error(log_msgptr, "\"%s\" is not a positive number", ss);
2482 else if (strncmpic(ss, US"unique=", 7) == 0)
2483 unique = string_copy(ss + 7);
2485 key = string_copy(ss);
2487 key = string_sprintf("%s/%s", key, ss);
2490 /* Sanity check. When the badacl flag is set the update mode must either
2491 be readonly (which is the default if it is omitted) or, for backwards
2492 compatibility, a combination of noupdate and strict or leaky. */
2494 if (mode == RATE_PER_CLASH)
2495 return ratelimit_error(log_msgptr, "conflicting per_* options");
2496 if (leaky + strict + readonly > 1)
2497 return ratelimit_error(log_msgptr, "conflicting update modes");
2498 if (badacl && (leaky || strict) && !noupdate)
2499 return ratelimit_error(log_msgptr,
2500 "\"%s\" must not have /leaky or /strict option, or cannot be used in %s ACL",
2501 ratelimit_option_string[mode], acl_wherenames[where]);
2503 /* Set the default values of any unset options. In readonly mode we
2504 perform the rate computation without any increment so that its value
2505 decays to eventually allow over-limit senders through. */
2507 if (noupdate) readonly = TRUE, leaky = strict = FALSE;
2508 if (badacl) readonly = TRUE;
2509 if (readonly) count = 0.0;
2510 if (!strict && !readonly) leaky = TRUE;
2511 if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL;
2513 /* Create the lookup key. If there is no explicit key, use sender_host_address.
2514 If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply
2515 omit it. The smoothing constant (sender_rate_period) and the per_xxx options
2516 are added to the key because they alter the meaning of the stored data. */
2519 key = !sender_host_address ? US"" : sender_host_address;
2521 key = string_sprintf("%s/%s/%s%s",
2523 ratelimit_option_string[mode],
2524 unique == NULL ? "" : "unique/",
2528 debug_printf_indent("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key);
2530 /* See if we have already computed the rate by looking in the relevant tree.
2531 For per-connection rate limiting, store tree nodes and dbdata in the permanent
2532 pool so that they survive across resets. In readonly mode we only remember the
2533 result for the rest of this command in case a later command changes it. After
2534 this bit of logic the code is independent of the per_* mode. */
2536 old_pool = store_pool;
2539 anchor = &ratelimiters_cmd;
2543 anchor = &ratelimiters_conn;
2544 store_pool = POOL_PERM;
2548 case RATE_PER_ALLRCPTS:
2549 anchor = &ratelimiters_mail;
2554 anchor = &ratelimiters_cmd;
2557 anchor = NULL; /* silence an "unused" complaint */
2558 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2559 "internal ACL error: unknown ratelimit mode %d", mode);
2564 if ((t = tree_search(*anchor, key)))
2567 /* The following few lines duplicate some of the code below. */
2568 rc = (dbd->rate < limit)? FAIL : OK;
2569 store_pool = old_pool;
2570 sender_rate = string_sprintf("%.1f", dbd->rate);
2572 debug_printf_indent("ratelimit found pre-computed rate %s\n", sender_rate);
2576 /* We aren't using a pre-computed rate, so get a previously recorded rate
2577 from the database, which will be updated and written back if required. */
2579 if (!(dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE, TRUE)))
2581 store_pool = old_pool;
2583 HDEBUG(D_acl) debug_printf_indent("ratelimit database not available\n");
2584 *log_msgptr = US"ratelimit database not available";
2587 dbdb = dbfn_read_with_length(dbm, key, &dbdb_size);
2590 gettimeofday(&tv, NULL);
2594 /* Locate the basic ratelimit block inside the DB data. */
2595 HDEBUG(D_acl) debug_printf_indent("ratelimit found key in database\n");
2598 /* Forget the old Bloom filter if it is too old, so that we count each
2599 repeating event once per period. We don't simply clear and re-use the old
2600 filter because we want its size to change if the limit changes. Note that
2601 we keep the dbd pointer for copying the rate into the new data block. */
2603 if(unique && tv.tv_sec > dbdb->bloom_epoch + period)
2605 HDEBUG(D_acl) debug_printf_indent("ratelimit discarding old Bloom filter\n");
2611 if(unique && dbdb_size < sizeof(*dbdb))
2613 HDEBUG(D_acl) debug_printf_indent("ratelimit discarding undersize Bloom filter\n");
2618 /* Allocate a new data block if the database lookup failed
2619 or the Bloom filter passed its age limit. */
2625 /* No Bloom filter. This basic ratelimit block is initialized below. */
2626 HDEBUG(D_acl) debug_printf_indent("ratelimit creating new rate data block\n");
2627 dbdb_size = sizeof(*dbd);
2628 dbdb = store_get(dbdb_size, GET_UNTAINTED);
2633 HDEBUG(D_acl) debug_printf_indent("ratelimit creating new Bloom filter\n");
2635 /* See the long comment below for an explanation of the magic number 2.
2636 The filter has a minimum size in case the rate limit is very small;
2637 this is determined by the definition of dbdata_ratelimit_unique. */
2639 extra = (int)limit * 2 - sizeof(dbdb->bloom);
2640 if (extra < 0) extra = 0;
2641 dbdb_size = sizeof(*dbdb) + extra;
2642 dbdb = store_get(dbdb_size, GET_UNTAINTED);
2643 dbdb->bloom_epoch = tv.tv_sec;
2644 dbdb->bloom_size = sizeof(dbdb->bloom) + extra;
2645 memset(dbdb->bloom, 0, dbdb->bloom_size);
2647 /* Preserve any basic ratelimit data (which is our longer-term memory)
2648 by copying it from the discarded block. */
2658 /* If we are counting unique events, find out if this event is new or not.
2659 If the client repeats the event during the current period then it should be
2660 counted. We skip this code in readonly mode for efficiency, because any
2661 changes to the filter will be discarded and because count is already set to
2664 if (unique && !readonly)
2666 /* We identify unique events using a Bloom filter. (You can find my
2667 notes on Bloom filters at http://fanf.livejournal.com/81696.html)
2668 With the per_addr option, an "event" is a recipient address, though the
2669 user can use the unique option to define their own events. We only count
2670 an event if we have not seen it before.
2672 We size the filter according to the rate limit, which (in leaky mode)
2673 is the limit on the population of the filter. We allow 16 bits of space
2674 per entry (see the construction code above) and we set (up to) 8 of them
2675 when inserting an element (see the loop below). The probability of a false
2676 positive (an event we have not seen before but which we fail to count) is
2680 allzero = exp(-numhash * pop / size)
2681 = exp(-0.5 * pop / limit)
2682 fpr = pow(1 - allzero, numhash)
2684 For senders at the limit the fpr is 0.06% or 1 in 1700
2685 and for senders at half the limit it is 0.0006% or 1 in 170000
2687 In strict mode the Bloom filter can fill up beyond the normal limit, in
2688 which case the false positive rate will rise. This means that the
2689 measured rate for very fast senders can bogusly drop off after a while.
2691 At twice the limit, the fpr is 2.5% or 1 in 40
2692 At four times the limit, it is 31% or 1 in 3.2
2694 It takes ln(pop/limit) periods for an over-limit burst of pop events to
2695 decay below the limit, and if this is more than one then the Bloom filter
2696 will be discarded before the decay gets that far. The false positive rate
2697 at this threshold is 9.3% or 1 in 10.7. */
2700 unsigned n, hash, hinc;
2704 /* Instead of using eight independent hash values, we combine two values
2705 using the formula h1 + n * h2. This does not harm the Bloom filter's
2706 performance, and means the amount of hash we need is independent of the
2707 number of bits we set in the filter. */
2709 md5_start(&md5info);
2710 md5_end(&md5info, unique, Ustrlen(unique), md5sum);
2711 hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24;
2712 hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24;
2714 /* Scan the bits corresponding to this event. A zero bit means we have
2715 not seen it before. Ensure all bits are set to record this event. */
2717 HDEBUG(D_acl) debug_printf_indent("ratelimit checking uniqueness of %s\n", unique);
2720 for (n = 0; n < 8; n++, hash += hinc)
2722 int bit = 1 << (hash % 8);
2723 int byte = (hash / 8) % dbdb->bloom_size;
2724 if ((dbdb->bloom[byte] & bit) == 0)
2726 dbdb->bloom[byte] |= bit;
2731 /* If this event has occurred before, do not count it. */
2735 HDEBUG(D_acl) debug_printf_indent("ratelimit event found in Bloom filter\n");
2739 HDEBUG(D_acl) debug_printf_indent("ratelimit event added to Bloom filter\n");
2742 /* If there was no previous ratelimit data block for this key, initialize
2743 the new one, otherwise update the block from the database. The initial rate
2744 is what would be computed by the code below for an infinite interval. */
2748 HDEBUG(D_acl) debug_printf_indent("ratelimit initializing new key's rate data\n");
2750 dbd->time_stamp = tv.tv_sec;
2751 dbd->time_usec = tv.tv_usec;
2756 /* The smoothed rate is computed using an exponentially weighted moving
2757 average adjusted for variable sampling intervals. The standard EWMA for
2758 a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1)
2759 where f() is the measured value and f'() is the smoothed value.
2761 Old data decays out of the smoothed value exponentially, such that data n
2762 samples old is multiplied by a^n. The exponential decay time constant p
2763 is defined such that data p samples old is multiplied by 1/e, which means
2764 that a = exp(-1/p). We can maintain the same time constant for a variable
2765 sampling interval i by using a = exp(-i/p).
2767 The rate we are measuring is messages per period, suitable for directly
2768 comparing with the limit. The average rate between now and the previous
2769 message is period / interval, which we feed into the EWMA as the sample.
2771 It turns out that the number of messages required for the smoothed rate
2772 to reach the limit when they are sent in a burst is equal to the limit.
2773 This can be seen by analysing the value of the smoothed rate after N
2774 messages sent at even intervals. Let k = (1 - a) * p/i
2776 rate_1 = (1 - a) * p/i + a * rate_0
2778 rate_2 = k + a * rate_1
2779 = k + a * k + a^2 * rate_0
2780 rate_3 = k + a * k + a^2 * k + a^3 * rate_0
2781 rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x)
2782 = rate_0 * a^N + k * (1 - a^N) / (1 - a)
2783 = rate_0 * a^N + p/i * (1 - a^N)
2785 When N is large, a^N -> 0 so rate_N -> p/i as desired.
2787 rate_N = p/i + (rate_0 - p/i) * a^N
2788 a^N = (rate_N - p/i) / (rate_0 - p/i)
2789 N * -i/p = log((rate_N - p/i) / (rate_0 - p/i))
2790 N = p/i * log((rate_0 - p/i) / (rate_N - p/i))
2792 Numerical analysis of the above equation, setting the computed rate to
2793 increase from rate_0 = 0 to rate_N = limit, shows that for large sending
2794 rates, p/i, the number of messages N = limit. So limit serves as both the
2795 maximum rate measured in messages per period, and the maximum number of
2796 messages that can be sent in a fast burst. */
2798 double this_time = (double)tv.tv_sec
2799 + (double)tv.tv_usec / 1000000.0;
2800 double prev_time = (double)dbd->time_stamp
2801 + (double)dbd->time_usec / 1000000.0;
2803 /* We must avoid division by zero, and deal gracefully with the clock going
2804 backwards. If we blunder ahead when time is in reverse then the computed
2805 rate will be bogus. To be safe we clamp interval to a very small number. */
2807 double interval = this_time - prev_time <= 0.0 ? 1e-9
2808 : this_time - prev_time;
2810 double i_over_p = interval / period;
2811 double a = exp(-i_over_p);
2813 /* Combine the instantaneous rate (period / interval) with the previous rate
2814 using the smoothing factor a. In order to measure sized events, multiply the
2815 instantaneous rate by the count of bytes or recipients etc. */
2817 dbd->time_stamp = tv.tv_sec;
2818 dbd->time_usec = tv.tv_usec;
2819 dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate;
2821 /* When events are very widely spaced the computed rate tends towards zero.
2822 Although this is accurate it turns out not to be useful for our purposes,
2823 especially when the first event after a long silence is the start of a spam
2824 run. A more useful model is that the rate for an isolated event should be the
2825 size of the event per the period size, ignoring the lack of events outside
2826 the current period and regardless of where the event falls in the period. So,
2827 if the interval was so long that the calculated rate is unhelpfully small, we
2828 re-initialize the rate. In the absence of higher-rate bursts, the condition
2829 below is true if the interval is greater than the period. */
2831 if (dbd->rate < count) dbd->rate = count;
2834 /* Clients sending at the limit are considered to be over the limit.
2835 This matters for edge cases such as a limit of zero, when the client
2836 should be completely blocked. */
2838 rc = dbd->rate < limit ? FAIL : OK;
2840 /* Update the state if the rate is low or if we are being strict. If we
2841 are in leaky mode and the sender's rate is too high, we do not update
2842 the recorded rate in order to avoid an over-aggressive sender's retry
2843 rate preventing them from getting any email through. If readonly is set,
2844 neither leaky nor strict are set, so we do not do any updates. */
2846 if ((rc == FAIL && leaky) || strict)
2848 dbfn_write(dbm, key, dbdb, dbdb_size);
2849 HDEBUG(D_acl) debug_printf_indent("ratelimit db updated\n");
2853 HDEBUG(D_acl) debug_printf_indent("ratelimit db not updated: %s\n",
2854 readonly? "readonly mode" : "over the limit, but leaky");
2859 /* Store the result in the tree for future reference. Take the taint status
2860 from the key for consistency even though it's unlikely we'll ever expand this. */
2862 t = store_get(sizeof(tree_node) + Ustrlen(key), key);
2864 Ustrcpy(t->name, key);
2865 (void)tree_insertnode(anchor, t);
2867 /* We create the formatted version of the sender's rate very late in
2868 order to ensure that it is done using the correct storage pool. */
2870 store_pool = old_pool;
2871 sender_rate = string_sprintf("%.1f", dbd->rate);
2874 debug_printf_indent("ratelimit computed rate %s\n", sender_rate);
2881 /*************************************************
2882 * Handle a check for previously-seen *
2883 *************************************************/
2886 ACL clauses like: seen = -5m / key=$foo / readonly
2888 Return is true for condition-true - but the semantics
2889 depend heavily on the actual use-case.
2891 Negative times test for seen-before, positive for seen-more-recently-than
2892 (the given interval before current time).
2894 All are subject to history not having been cleaned from the DB.
2896 Default for seen-before is to create if not present, and to
2897 update if older than 10d (with the seen-test time).
2898 Default for seen-since is to always create or update.
2901 key=value. Default key is $sender_host_address
2904 refresh=<interval>: update an existing DB entry older than given
2905 amount. Default refresh lacking this option is 10d.
2906 The update sets the record timestamp to the seen-test time.
2908 XXX do we need separate nocreate, noupdate controls?
2911 arg the option string for seen=
2912 where ACL_WHERE_xxxx indicating which ACL this is
2913 log_msgptr for error messages
2915 Returns: OK - Condition is true
2916 FAIL - Condition is false
2917 DEFER - Problem opening history database
2918 ERROR - Syntax error in options
2922 acl_seen(const uschar * arg, int where, uschar ** log_msgptr)
2924 enum { SEEN_DEFAULT, SEEN_READONLY, SEEN_WRITE };
2926 const uschar * list = arg;
2927 int slash = '/', interval, mode = SEEN_DEFAULT, yield = FAIL;
2929 int refresh = 10 * 24 * 60 * 60; /* 10 days */
2930 const uschar * ele, * key = sender_host_address;
2931 open_db dbblock, * dbm;
2935 /* Parse the first element, the time-relation. */
2937 if (!(ele = string_nextinlist(&list, &slash, NULL, 0)))
2939 if ((before = *ele == '-'))
2941 if ((interval = readconf_readtime(ele, 0, FALSE)) < 0)
2944 /* Remaining elements are options */
2946 while ((ele = string_nextinlist(&list, &slash, NULL, 0)))
2947 if (Ustrncmp(ele, "key=", 4) == 0)
2949 else if (Ustrcmp(ele, "readonly") == 0)
2950 mode = SEEN_READONLY;
2951 else if (Ustrcmp(ele, "write") == 0)
2953 else if (Ustrncmp(ele, "refresh=", 8) == 0)
2955 if ((refresh = readconf_readtime(ele + 8, 0, FALSE)) < 0)
2961 if (!(dbm = dbfn_open(US"seen", O_RDWR, &dbblock, TRUE, TRUE)))
2963 HDEBUG(D_acl) debug_printf_indent("database for 'seen' not available\n");
2964 *log_msgptr = US"database for 'seen' not available";
2968 dbd = dbfn_read_with_length(dbm, key, NULL);
2970 if (dbd) /* an existing record */
2972 time_t diff = now - dbd->time_stamp; /* time since the record was written */
2974 if (before ? diff >= interval : diff < interval)
2977 if (mode == SEEN_READONLY)
2978 { HDEBUG(D_acl) debug_printf_indent("seen db not written (readonly)\n"); }
2979 else if (mode == SEEN_WRITE || !before)
2981 dbd->time_stamp = now;
2982 dbfn_write(dbm, key, dbd, sizeof(*dbd));
2983 HDEBUG(D_acl) debug_printf_indent("seen db written (update)\n");
2985 else if (diff >= refresh)
2987 dbd->time_stamp = now - interval;
2988 dbfn_write(dbm, key, dbd, sizeof(*dbd));
2989 HDEBUG(D_acl) debug_printf_indent("seen db written (refresh)\n");
2993 { /* No record found, yield always FAIL */
2994 if (mode != SEEN_READONLY)
2996 dbdata_seen d = {.time_stamp = now};
2997 dbfn_write(dbm, key, &d, sizeof(*dbd));
2998 HDEBUG(D_acl) debug_printf_indent("seen db written (create)\n");
3001 HDEBUG(D_acl) debug_printf_indent("seen db not written (readonly)\n");
3009 *log_msgptr = string_sprintf("failed to parse '%s'", arg);
3012 *log_msgptr = string_sprintf("unrecognised option '%s' in '%s'", ele, arg);
3018 /*************************************************
3019 * The udpsend ACL modifier *
3020 *************************************************/
3022 /* Called by acl_check_condition() below.
3025 arg the option string for udpsend=
3026 log_msgptr for error messages
3028 Returns: OK - Completed.
3029 DEFER - Problem with DNS lookup.
3030 ERROR - Syntax error in options.
3034 acl_udpsend(const uschar *arg, uschar **log_msgptr)
3046 hostname = string_nextinlist(&arg, &sep, NULL, 0);
3047 portstr = string_nextinlist(&arg, &sep, NULL, 0);
3051 *log_msgptr = US"missing destination host in \"udpsend\" modifier";
3056 *log_msgptr = US"missing destination port in \"udpsend\" modifier";
3061 *log_msgptr = US"missing datagram payload in \"udpsend\" modifier";
3064 portnum = Ustrtol(portstr, &portend, 10);
3065 if (*portend != '\0')
3067 *log_msgptr = US"bad destination port in \"udpsend\" modifier";
3071 /* Make a single-item host list. */
3072 h = store_get(sizeof(host_item), GET_UNTAINTED);
3073 memset(h, 0, sizeof(host_item));
3078 if (string_is_ip_address(hostname, NULL))
3079 h->address = hostname, r = HOST_FOUND;
3081 r = host_find_byname(h, NULL, 0, NULL, FALSE);
3082 if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN)
3084 *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier";
3089 debug_printf_indent("udpsend [%s]:%d %s\n", h->address, portnum, arg);
3091 /*XXX this could better use sendto */
3092 r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum,
3093 1, NULL, &errstr, NULL);
3094 if (r < 0) goto defer;
3096 r = send(s, arg, len, 0);
3099 errstr = US strerror(errno);
3107 string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r);
3112 debug_printf_indent("udpsend %d bytes\n", r);
3117 *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr);
3123 /*************************************************
3124 * Handle conditions/modifiers on an ACL item *
3125 *************************************************/
3127 /* Called from acl_check() below.
3131 cb ACL condition block - if NULL, result is OK
3132 where where called from
3133 addr the address being checked for RCPT, or NULL
3134 level the nesting level
3135 epp pointer to pass back TRUE if "endpass" encountered
3136 (applies only to "accept" and "discard")
3137 user_msgptr user message pointer
3138 log_msgptr log message pointer
3139 basic_errno pointer to where to put verify error
3141 Returns: OK - all conditions are met
3142 DISCARD - an "acl" condition returned DISCARD - only allowed
3143 for "accept" or "discard" verbs
3144 FAIL - at least one condition fails
3145 FAIL_DROP - an "acl" condition returned FAIL_DROP
3146 DEFER - can't tell at the moment (typically, lookup defer,
3147 but can be temporary callout problem)
3148 ERROR - ERROR from nested ACL or expansion failure or other
3153 acl_check_condition(int verb, acl_condition_block *cb, int where,
3154 address_item *addr, int level, BOOL *epp, uschar **user_msgptr,
3155 uschar **log_msgptr, int *basic_errno)
3157 uschar * user_message = NULL;
3158 uschar * log_message = NULL;
3161 for (; cb; cb = cb->next)
3165 BOOL textonly = FALSE;
3167 /* The message and log_message items set up messages to be used in
3168 case of rejection. They are expanded later. */
3170 if (cb->type == ACLC_MESSAGE)
3172 HDEBUG(D_acl) debug_printf_indent(" message: %s\n", cb->arg);
3173 user_message = cb->arg;
3177 if (cb->type == ACLC_LOG_MESSAGE)
3179 HDEBUG(D_acl) debug_printf_indent("l_message: %s\n", cb->arg);
3180 log_message = cb->arg;
3184 /* The endpass "condition" just sets a flag to show it occurred. This is
3185 checked at compile time to be on an "accept" or "discard" item. */
3187 if (cb->type == ACLC_ENDPASS)
3193 /* For other conditions and modifiers, the argument is expanded now for some
3194 of them, but not for all, because expansion happens down in some lower level
3195 checking functions in some cases. */
3197 if (!conditions[cb->type].expand_at_top)
3200 else if (!(arg = expand_string_2(cb->arg, &textonly)))
3202 if (f.expand_string_forcedfail) continue;
3203 *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s",
3204 cb->arg, expand_string_message);
3205 return f.search_find_defer ? DEFER : ERROR;
3208 /* Show condition, and expanded condition if it's different */
3213 debug_printf_indent("check %s%s %n",
3214 (!conditions[cb->type].is_modifier && cb->u.negated)? "!":"",
3215 conditions[cb->type].name, &lhswidth);
3217 if (cb->type == ACLC_SET)
3219 #ifndef DISABLE_DKIM
3220 if ( Ustrcmp(cb->u.varname, "dkim_verify_status") == 0
3221 || Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0)
3223 debug_printf("%s ", cb->u.varname);
3229 debug_printf("acl_%s ", cb->u.varname);
3230 lhswidth += 5 + Ustrlen(cb->u.varname);
3234 debug_printf("= %s\n", cb->arg);
3237 debug_printf("%.*s= %s\n", lhswidth,
3241 /* Check that this condition makes sense at this time */
3243 if ((conditions[cb->type].forbids & (1 << where)) != 0)
3245 *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL",
3246 conditions[cb->type].is_modifier ? "use" : "test",
3247 conditions[cb->type].name, acl_wherenames[where]);
3251 /* Run the appropriate test for each condition, or take the appropriate
3252 action for the remaining modifiers. */
3256 case ACLC_ADD_HEADER:
3260 /* A nested ACL that returns "discard" makes sense only for an "accept" or
3264 rc = acl_check_wargs(where, addr, arg, user_msgptr, log_msgptr);
3265 if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD)
3267 *log_msgptr = string_sprintf("nested ACL returned \"discard\" for "
3268 "\"%s\" command (only allowed with \"accept\" or \"discard\")",
3274 case ACLC_AUTHENTICATED:
3275 rc = sender_host_authenticated ? match_isinlist(sender_host_authenticated,
3276 &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL) : FAIL;
3279 #ifdef EXPERIMENTAL_BRIGHTMAIL
3280 case ACLC_BMI_OPTIN:
3282 int old_pool = store_pool;
3283 store_pool = POOL_PERM;
3284 bmi_current_optin = string_copy(arg);
3285 store_pool = old_pool;
3290 case ACLC_CONDITION:
3291 /* The true/false parsing here should be kept in sync with that used in
3292 expand.c when dealing with ECOND_BOOL so that we don't have too many
3293 different definitions of what can be a boolean. */
3295 ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */
3296 : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */
3297 rc = (Uatoi(arg) == 0)? FAIL : OK;
3299 rc = (strcmpic(arg, US"no") == 0 ||
3300 strcmpic(arg, US"false") == 0)? FAIL :
3301 (strcmpic(arg, US"yes") == 0 ||
3302 strcmpic(arg, US"true") == 0)? OK : DEFER;
3304 *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg);
3307 case ACLC_CONTINUE: /* Always succeeds */
3312 const uschar *p = NULL;
3313 control_type = decode_control(arg, &p, where, log_msgptr);
3315 /* Check if this control makes sense at this time */
3317 if (controls_list[control_type].forbids & (1 << where))
3319 *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL",
3320 controls_list[control_type].name, acl_wherenames[where]);
3324 switch(control_type)
3326 case CONTROL_AUTH_UNADVERTISED:
3327 f.allow_auth_unadvertised = TRUE;
3330 #ifdef EXPERIMENTAL_BRIGHTMAIL
3331 case CONTROL_BMI_RUN:
3336 #ifndef DISABLE_DKIM
3337 case CONTROL_DKIM_VERIFY:
3338 f.dkim_disable_verify = TRUE;
3339 # ifdef SUPPORT_DMARC
3340 /* Since DKIM was blocked, skip DMARC too */
3341 f.dmarc_disable_verify = TRUE;
3342 f.dmarc_enable_forensic = FALSE;
3347 #ifdef SUPPORT_DMARC
3348 case CONTROL_DMARC_VERIFY:
3349 f.dmarc_disable_verify = TRUE;
3352 case CONTROL_DMARC_FORENSIC:
3353 f.dmarc_enable_forensic = TRUE;
3360 int fd, af, level, optname, value;
3361 /* If we are acting on stdin, the setsockopt may fail if stdin is not
3362 a socket; we can accept that, we'll just debug-log failures anyway. */
3363 fd = fileno(smtp_in);
3364 if ((af = ip_get_address_family(fd)) < 0)
3367 debug_printf_indent("smtp input is probably not a socket [%s], not setting DSCP\n",
3371 if (dscp_lookup(p+1, af, &level, &optname, &value))
3372 if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0)
3374 HDEBUG(D_acl) debug_printf_indent("failed to set input DSCP[%s]: %s\n",
3375 p+1, strerror(errno));
3379 HDEBUG(D_acl) debug_printf_indent("set input DSCP to \"%s\"\n", p+1);
3383 *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg);
3389 *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
3397 case CONTROL_CASEFUL_LOCAL_PART:
3398 deliver_localpart = addr->cc_local_part;
3401 case CONTROL_CASELOWER_LOCAL_PART:
3402 deliver_localpart = addr->lc_local_part;
3405 case CONTROL_ENFORCE_SYNC:
3406 smtp_enforce_sync = TRUE;
3409 case CONTROL_NO_ENFORCE_SYNC:
3410 smtp_enforce_sync = FALSE;
3413 #ifdef WITH_CONTENT_SCAN
3414 case CONTROL_NO_MBOX_UNSPOOL:
3415 f.no_mbox_unspool = TRUE;
3419 case CONTROL_NO_MULTILINE:
3420 f.no_multiline_responses = TRUE;
3423 case CONTROL_NO_PIPELINING:
3424 f.pipelining_enable = FALSE;
3427 case CONTROL_NO_DELAY_FLUSH:
3428 f.disable_delay_flush = TRUE;
3431 case CONTROL_NO_CALLOUT_FLUSH:
3432 f.disable_callout_flush = TRUE;
3435 case CONTROL_FAKEREJECT:
3436 cancel_cutthrough_connection(TRUE, US"fakereject");
3437 case CONTROL_FAKEDEFER:
3438 fake_response = control_type == CONTROL_FAKEDEFER ? DEFER : FAIL;
3441 const uschar *pp = p + 1;
3443 /* The entire control= line was expanded at top so no need to expand
3444 the part after the / */
3445 fake_response_text = string_copyn(p+1, pp-p-1);
3448 else /* Explicitly reset to default string */
3449 fake_response_text = US"Your message has been rejected but is being kept for evaluation.\nIf it was a legitimate message, it may still be delivered to the target recipient(s).";
3452 case CONTROL_FREEZE:
3453 f.deliver_freeze = TRUE;
3454 deliver_frozen_at = time(NULL);
3455 freeze_tell = freeze_tell_config; /* Reset to configured value */
3456 if (Ustrncmp(p, "/no_tell", 8) == 0)
3463 *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
3466 cancel_cutthrough_connection(TRUE, US"item frozen");
3470 f.queue_only_policy = TRUE;
3471 if (Ustrcmp(p, "_only") == 0)
3473 else while (*p == '/')
3474 if (Ustrncmp(p, "/only", 5) == 0)
3475 { p += 5; f.queue_smtp = FALSE; }
3476 else if (Ustrncmp(p, "/first_pass_route", 17) == 0)
3477 { p += 17; f.queue_smtp = TRUE; }
3480 cancel_cutthrough_connection(TRUE, US"queueing forced");
3483 case CONTROL_SUBMISSION:
3484 originator_name = US"";
3485 f.submission_mode = TRUE;
3488 if (Ustrncmp(p, "/sender_retain", 14) == 0)
3491 f.active_local_sender_retain = TRUE;
3492 f.active_local_from_check = FALSE;
3494 else if (Ustrncmp(p, "/domain=", 8) == 0)
3496 const uschar *pp = p + 8;
3497 while (*pp && *pp != '/') pp++;
3498 submission_domain = string_copyn(p+8, pp-p-8);
3501 /* The name= option must be last, because it swallows the rest of
3503 else if (Ustrncmp(p, "/name=", 6) == 0)
3505 const uschar *pp = p + 6;
3507 submission_name = parse_fix_phrase(p+6, pp-p-6);
3514 *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
3521 uschar * debug_tag = NULL, * debug_opts = NULL;
3522 BOOL kill = FALSE, stop = FALSE;
3526 const uschar * pp = p+1;
3527 if (Ustrncmp(pp, "tag=", 4) == 0)
3529 for (pp += 4; *pp && *pp != '/';) pp++;
3530 debug_tag = string_copyn(p+5, pp-p-5);
3532 else if (Ustrncmp(pp, "opts=", 5) == 0)
3534 for (pp += 5; *pp && *pp != '/';) pp++;
3535 debug_opts = string_copyn(p+6, pp-p-6);
3537 else if (Ustrncmp(pp, "kill", 4) == 0)
3542 else if (Ustrncmp(pp, "stop", 4) == 0)
3547 else if (Ustrncmp(pp, "pretrigger=", 11) == 0)
3548 debug_pretrigger_setup(pp+11);
3549 else if (Ustrncmp(pp, "trigger=", 8) == 0)
3551 if (Ustrncmp(pp += 8, "now", 3) == 0)
3554 debug_trigger_fire();
3556 else if (Ustrncmp(pp, "paniclog", 8) == 0)
3559 dtrigger_selector |= BIT(DTi_panictrigger);
3562 while (*pp && *pp != '/') pp++;
3567 debug_logging_stop(TRUE);
3569 debug_logging_stop(FALSE);
3570 else if (debug_tag || debug_opts)
3571 debug_logging_activate(debug_tag, debug_opts);
3575 case CONTROL_SUPPRESS_LOCAL_FIXUPS:
3576 f.suppress_local_fixups = TRUE;
3579 case CONTROL_CUTTHROUGH_DELIVERY:
3581 uschar * ignored = NULL;
3582 #ifndef DISABLE_PRDR
3587 /* Too hard to think about for now. We might in future cutthrough
3588 the case where both sides handle prdr and this-node prdr acl
3590 ignored = US"PRDR active";
3591 else if (f.deliver_freeze)
3592 ignored = US"frozen";
3593 else if (f.queue_only_policy)
3594 ignored = US"queue-only";
3595 else if (fake_response == FAIL)
3596 ignored = US"fakereject";
3597 else if (rcpt_count != 1)
3598 ignored = US"nonfirst rcpt";
3599 else if (cutthrough.delivery)
3600 ignored = US"repeated";
3601 else if (cutthrough.callout_hold_only)
3604 debug_printf_indent(" cutthrough request upgrades callout hold\n");
3605 cutthrough.callout_hold_only = FALSE;
3606 cutthrough.delivery = TRUE; /* control accepted */
3610 cutthrough.delivery = TRUE; /* control accepted */
3613 const uschar * pp = p+1;
3614 if (Ustrncmp(pp, "defer=", 6) == 0)
3617 if (Ustrncmp(pp, "pass", 4) == 0) cutthrough.defer_pass = TRUE;
3618 /* else if (Ustrncmp(pp, "spool") == 0) ; default */
3621 while (*pp && *pp != '/') pp++;
3626 DEBUG(D_acl) if (ignored)
3627 debug_printf(" cutthrough request ignored on %s item\n", ignored);
3632 case CONTROL_UTF8_DOWNCONVERT:
3637 message_utf8_downconvert = 1;
3638 addr->prop.utf8_downcvt = TRUE;
3639 addr->prop.utf8_downcvt_maybe = FALSE;
3645 message_utf8_downconvert = 0;
3646 addr->prop.utf8_downcvt = FALSE;
3647 addr->prop.utf8_downcvt_maybe = FALSE;
3651 if (p[1] == '-' && p[2] == '1')
3653 message_utf8_downconvert = -1;
3654 addr->prop.utf8_downcvt = FALSE;
3655 addr->prop.utf8_downcvt_maybe = TRUE;
3659 *log_msgptr = US"bad option value for control=utf8_downconvert";
3663 message_utf8_downconvert = 1;
3664 addr->prop.utf8_downcvt = TRUE;
3665 addr->prop.utf8_downcvt_maybe = FALSE;
3675 #ifdef EXPERIMENTAL_DCC
3678 /* Separate the regular expression and any optional parameters. */
3679 const uschar * list = arg;
3681 uschar * ss = string_nextinlist(&list, &sep, NULL, 0);
3682 /* Run the dcc backend. */
3683 rc = dcc_process(&ss);
3684 /* Modify return code based upon the existence of options. */
3685 while ((ss = string_nextinlist(&list, &sep, NULL, 0)))
3686 if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER)
3687 rc = FAIL; /* FAIL so that the message is passed to the next ACL */
3692 #ifdef WITH_CONTENT_SCAN
3694 rc = mime_decode(&arg);
3700 int delay = readconf_readtime(arg, 0, FALSE);
3703 *log_msgptr = string_sprintf("syntax error in argument for \"delay\" "
3704 "modifier: \"%s\" is not a time value", arg);
3709 HDEBUG(D_acl) debug_printf_indent("delay modifier requests %d-second delay\n",
3714 debug_printf_indent("delay skipped in -bh checking mode\n");
3717 /* NOTE 1: Remember that we may be
3718 dealing with stdin/stdout here, in addition to TCP/IP connections.
3719 Also, delays may be specified for non-SMTP input, where smtp_out and
3720 smtp_in will be NULL. Whatever is done must work in all cases.
3722 NOTE 2: The added feature of flushing the output before a delay must
3723 apply only to SMTP input. Hence the test for smtp_out being non-NULL.
3728 if (smtp_out && !f.disable_delay_flush)
3731 #if !defined(NO_POLL_H) && defined (POLLRDHUP)
3737 p.fd = fileno(smtp_out);
3738 p.events = POLLRDHUP;
3741 if (poll(&p, n, delay*1000) > 0)
3742 HDEBUG(D_acl) debug_printf_indent("delay cancelled by peer close\n");
3745 /* Lacking POLLRDHUP it appears to be impossible to detect that a
3746 TCP/IP connection has gone away without reading from it. This means
3747 that we cannot shorten the delay below if the client goes away,
3748 because we cannot discover that the client has closed its end of the
3749 connection. (The connection is actually in a half-closed state,
3750 waiting for the server to close its end.) It would be nice to be able
3751 to detect this state, so that the Exim process is not held up
3752 unnecessarily. However, it seems that we can't. The poll() function
3753 does not do the right thing, and in any case it is not always
3756 while (delay > 0) delay = sleep(delay);
3763 #ifndef DISABLE_DKIM
3764 case ACLC_DKIM_SIGNER:
3765 if (dkim_cur_signer)
3766 rc = match_isinlist(dkim_cur_signer,
3767 &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL);
3772 case ACLC_DKIM_STATUS:
3773 { /* return good for any match */
3774 const uschar * s = dkim_verify_status ? dkim_verify_status : US"none";
3776 for (uschar * ss; ss = string_nextinlist(&s, &sep, NULL, 0); )
3777 if ( (rc = match_isinlist(ss, &arg,
3778 0, NULL, NULL, MCL_STRING, TRUE, NULL))
3784 #ifdef SUPPORT_DMARC
3785 case ACLC_DMARC_STATUS:
3786 if (!f.dmarc_has_been_checked)
3788 f.dmarc_has_been_checked = TRUE;
3790 /* used long way of dmarc_exim_expand_query() in case we need more
3791 view into the process in the future. */
3792 rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS),
3793 &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL);
3798 rc = verify_check_dnsbl(where, &arg, log_msgptr);
3802 rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor,
3803 addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data);
3806 /* The value in tls_cipher is the full cipher name, for example,
3807 TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the
3808 cipher names such as DES-CBC3-SHA. But program defensively. We don't know
3809 what may in practice come out of the SSL library - which at the time of
3810 writing is poorly documented. */
3812 case ACLC_ENCRYPTED:
3813 if (!tls_in.cipher) rc = FAIL;
3816 uschar *endcipher = NULL;
3817 uschar *cipher = Ustrchr(tls_in.cipher, ':');
3818 if (!cipher) cipher = tls_in.cipher; else
3820 endcipher = Ustrchr(++cipher, ':');
3821 if (endcipher) *endcipher = 0;
3823 rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL);
3824 if (endcipher) *endcipher = ':';
3828 /* Use verify_check_this_host() instead of verify_check_host() so that
3829 we can pass over &host_data to catch any looked up data. Once it has been
3830 set, it retains its value so that it's still there if another ACL verb
3831 comes through here and uses the cache. However, we must put it into
3832 permanent store in case it is also expected to be used in a subsequent
3833 message in the same SMTP connection. */
3836 rc = verify_check_this_host(&arg, sender_host_cache, NULL,
3837 sender_host_address ? sender_host_address : US"", CUSS &host_data);
3838 if (rc == DEFER) *log_msgptr = search_error_message;
3839 if (host_data) host_data = string_copy_perm(host_data, TRUE);
3842 case ACLC_LOCAL_PARTS:
3843 rc = match_isinlist(addr->cc_local_part, &arg, 0,
3844 &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE,
3845 CUSS &deliver_localpart_data);
3848 case ACLC_LOG_REJECT_TARGET:
3850 int logbits = 0, sep = 0;
3851 const uschar * s = arg;
3853 for (uschar * ss; ss = string_nextinlist(&s, &sep, NULL, 0); )
3855 if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN;
3856 else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC;
3857 else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT;
3860 logbits |= LOG_MAIN|LOG_REJECT;
3861 log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in "
3862 "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]);
3865 log_reject_target = logbits;
3872 const uschar *s = arg;
3878 if (Ustrncmp(s, "main", 4) == 0)
3879 { logbits |= LOG_MAIN; s += 4; }
3880 else if (Ustrncmp(s, "panic", 5) == 0)
3881 { logbits |= LOG_PANIC; s += 5; }
3882 else if (Ustrncmp(s, "reject", 6) == 0)
3883 { logbits |= LOG_REJECT; s += 6; }
3886 logbits = LOG_MAIN|LOG_PANIC;
3887 s = string_sprintf(":unknown log name in \"%s\" in "
3888 "\"logwrite\" in %s ACL", arg, acl_wherenames[where]);
3894 while (isspace(*s)) s++;
3896 if (logbits == 0) logbits = LOG_MAIN;
3897 log_write(0, logbits, "%s", string_printing(s));
3901 #ifdef WITH_CONTENT_SCAN
3902 case ACLC_MALWARE: /* Run the malware backend. */
3904 /* Separate the regular expression and any optional parameters. */
3905 const uschar * list = arg;
3906 BOOL defer_ok = FALSE;
3907 int timeout = 0, sep = -'/';
3908 uschar * ss = string_nextinlist(&list, &sep, NULL, 0);
3910 for (uschar * opt; opt = string_nextinlist(&list, &sep, NULL, 0); )
3911 if (strcmpic(opt, US"defer_ok") == 0)
3913 else if ( strncmpic(opt, US"tmo=", 4) == 0
3914 && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0
3917 *log_msgptr = string_sprintf("bad timeout value in '%s'", opt);
3921 rc = malware(ss, textonly, timeout);
3922 if (rc == DEFER && defer_ok)
3923 rc = FAIL; /* FAIL so that the message is passed to the next ACL */
3927 case ACLC_MIME_REGEX:
3928 rc = mime_regex(&arg, textonly);
3933 if (is_tainted(arg))
3935 *log_msgptr = string_sprintf("Tainted name '%s' for queue not permitted",
3939 if (Ustrchr(arg, '/'))
3941 *log_msgptr = string_sprintf(
3942 "Directory separator not permitted in queue name: '%s'", arg);
3945 queue_name = string_copy_perm(arg, FALSE);
3948 case ACLC_RATELIMIT:
3949 rc = acl_ratelimit(arg, where, log_msgptr);
3952 case ACLC_RECIPIENTS:
3953 rc = match_address_list(CUS addr->address, TRUE, TRUE, &arg, NULL, -1, 0,
3954 CUSS &recipient_data);
3957 #ifdef WITH_CONTENT_SCAN
3959 rc = regex(&arg, textonly);
3963 case ACLC_REMOVE_HEADER:
3964 setup_remove_header(arg);
3968 rc = acl_seen(arg, where, log_msgptr);
3971 case ACLC_SENDER_DOMAINS:
3974 sdomain = Ustrrchr(sender_address, '@');
3975 sdomain = sdomain ? sdomain + 1 : US"";
3976 rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor,
3977 sender_domain_cache, MCL_DOMAIN, TRUE, NULL);
3982 rc = match_address_list(CUS sender_address, TRUE, TRUE, &arg,
3983 sender_address_cache, -1, 0, CUSS &sender_data);
3986 /* Connection variables must persist forever; message variables not */
3990 int old_pool = store_pool;
3991 if ( cb->u.varname[0] != 'm'
3992 #ifndef DISABLE_EVENT
3993 || event_name /* An event is being delivered */
3996 store_pool = POOL_PERM;
3997 #ifndef DISABLE_DKIM /* Overwriteable dkim result variables */
3998 if (Ustrcmp(cb->u.varname, "dkim_verify_status") == 0)
3999 dkim_verify_status = string_copy(arg);
4000 else if (Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0)
4001 dkim_verify_reason = string_copy(arg);
4004 acl_var_create(cb->u.varname)->data.ptr = string_copy(arg);
4005 store_pool = old_pool;
4009 #ifdef WITH_CONTENT_SCAN
4012 /* Separate the regular expression and any optional parameters. */
4013 const uschar * list = arg;
4015 uschar * ss = string_nextinlist(&list, &sep, NULL, 0);
4017 rc = spam(CUSS &ss);
4018 /* Modify return code based upon the existence of options. */
4019 while ((ss = string_nextinlist(&list, &sep, NULL, 0)))
4020 if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER)
4021 rc = FAIL; /* FAIL so that the message is passed to the next ACL */
4028 rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL);
4031 case ACLC_SPF_GUESS:
4032 rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS);
4037 rc = acl_udpsend(arg, log_msgptr);
4040 /* If the verb is WARN, discard any user message from verification, because
4041 such messages are SMTP responses, not header additions. The latter come
4042 only from explicit "message" modifiers. However, put the user message into
4043 $acl_verify_message so it can be used in subsequent conditions or modifiers
4044 (until something changes it). */
4047 rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno);
4049 acl_verify_message = *user_msgptr;
4050 if (verb == ACL_WARN) *user_msgptr = NULL;
4054 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown "
4055 "condition %d", cb->type);
4059 /* If a condition was negated, invert OK/FAIL. */
4061 if (!conditions[cb->type].is_modifier && cb->u.negated)
4062 if (rc == OK) rc = FAIL;
4063 else if (rc == FAIL || rc == FAIL_DROP) rc = OK;
4065 if (rc != OK) break; /* Conditions loop */
4069 /* If the result is the one for which "message" and/or "log_message" are used,
4070 handle the values of these modifiers. If there isn't a log message set, we make
4071 it the same as the user message.
4073 "message" is a user message that will be included in an SMTP response. Unless
4074 it is empty, it overrides any previously set user message.
4076 "log_message" is a non-user message, and it adds to any existing non-user
4077 message that is already set.
4079 Most verbs have but a single return for which the messages are relevant, but
4080 for "discard", it's useful to have the log message both when it succeeds and
4081 when it fails. For "accept", the message is used in the OK case if there is no
4082 "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is
4085 if (*epp && rc == OK) user_message = NULL;
4087 if ((BIT(rc) & msgcond[verb]) != 0)
4090 uschar *old_user_msgptr = *user_msgptr;
4091 uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr;
4093 /* If the verb is "warn", messages generated by conditions (verification or
4094 nested ACLs) are always discarded. This also happens for acceptance verbs
4095 when they actually do accept. Only messages specified at this level are used.
4096 However, the value of an existing message is available in $acl_verify_message
4097 during expansions. */
4099 if (verb == ACL_WARN ||
4100 (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD)))
4101 *log_msgptr = *user_msgptr = NULL;
4105 acl_verify_message = old_user_msgptr;
4106 expmessage = expand_string(user_message);
4109 if (!f.expand_string_forcedfail)
4110 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s",
4111 user_message, expand_string_message);
4113 else if (expmessage[0] != 0) *user_msgptr = expmessage;
4118 acl_verify_message = old_log_msgptr;
4119 expmessage = expand_string(log_message);
4122 if (!f.expand_string_forcedfail)
4123 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s",
4124 log_message, expand_string_message);
4126 else if (expmessage[0] != 0)
4128 *log_msgptr = (*log_msgptr == NULL)? expmessage :
4129 string_sprintf("%s: %s", expmessage, *log_msgptr);
4133 /* If no log message, default it to the user message */
4135 if (!*log_msgptr) *log_msgptr = *user_msgptr;
4138 acl_verify_message = NULL;
4146 /*************************************************
4147 * Get line from a literal ACL *
4148 *************************************************/
4150 /* This function is passed to acl_read() in order to extract individual lines
4151 of a literal ACL, which we access via static pointers. We can destroy the
4152 contents because this is called only once (the compiled ACL is remembered).
4154 This code is intended to treat the data in the same way as lines in the main
4155 Exim configuration file. That is:
4157 . Leading spaces are ignored.
4159 . A \ at the end of a line is a continuation - trailing spaces after the \
4160 are permitted (this is because I don't believe in making invisible things
4161 significant). Leading spaces on the continued part of a line are ignored.
4163 . Physical lines starting (significantly) with # are totally ignored, and
4164 may appear within a sequence of backslash-continued lines.
4166 . Blank lines are ignored, but will end a sequence of continuations.
4169 Returns: a pointer to the next line
4173 static uschar *acl_text; /* Current pointer in the text */
4174 static uschar *acl_text_end; /* Points one past the terminating '0' */
4182 /* This loop handles leading blank lines and comments. */
4186 Uskip_whitespace(&acl_text); /* Leading spaces/empty lines */
4187 if (!*acl_text) return NULL; /* No more data */
4188 yield = acl_text; /* Potential data line */
4190 while (*acl_text && *acl_text != '\n') acl_text++;
4192 /* If we hit the end before a newline, we have the whole logical line. If
4193 it's a comment, there's no more data to be given. Otherwise, yield it. */
4195 if (!*acl_text) return *yield == '#' ? NULL : yield;
4197 /* After reaching a newline, end this loop if the physical line does not
4198 start with '#'. If it does, it's a comment, and the loop continues. */
4200 if (*yield != '#') break;
4203 /* This loop handles continuations. We know we have some real data, ending in
4204 newline. See if there is a continuation marker at the end (ignoring trailing
4205 white space). We know that *yield is not white space, so no need to test for
4206 cont > yield in the backwards scanning loop. */
4211 for (cont = acl_text - 1; isspace(*cont); cont--);
4213 /* If no continuation follows, we are done. Mark the end of the line and
4222 /* We have encountered a continuation. Skip over whitespace at the start of
4223 the next line, and indeed the whole of the next line or lines if they are
4228 while (*(++acl_text) == ' ' || *acl_text == '\t');
4229 if (*acl_text != '#') break;
4230 while (*(++acl_text) != 0 && *acl_text != '\n');
4233 /* We have the start of a continuation line. Move all the rest of the data
4234 to join onto the previous line, and then find its end. If the end is not a
4235 newline, we are done. Otherwise loop to look for another continuation. */
4237 memmove(cont, acl_text, acl_text_end - acl_text);
4238 acl_text_end -= acl_text - cont;
4240 while (*acl_text != 0 && *acl_text != '\n') acl_text++;
4241 if (*acl_text == 0) return yield;
4244 /* Control does not reach here */
4251 /************************************************/
4252 /* For error messages, a string describing the config location
4253 associated with current processing. NULL if not in an ACL. */
4256 acl_current_verb(void)
4258 if (acl_current) return string_sprintf(" (ACL %s, %s %d)",
4259 verbs[acl_current->verb], acl_current->srcfile, acl_current->srcline);
4263 /*************************************************
4264 * Check access using an ACL *
4265 *************************************************/
4267 /* This function is called from address_check. It may recurse via
4268 acl_check_condition() - hence the use of a level to stop looping. The ACL is
4269 passed as a string which is expanded. A forced failure implies no access check
4270 is required. If the result is a single word, it is taken as the name of an ACL
4271 which is sought in the global ACL tree. Otherwise, it is taken as literal ACL
4272 text, complete with newlines, and parsed as such. In both cases, the ACL check
4273 is then run. This function uses an auxiliary function for acl_read() to call
4274 for reading individual lines of a literal ACL. This is acl_getline(), which
4275 appears immediately above.
4278 where where called from
4279 addr address item when called from RCPT; otherwise NULL
4280 s the input string; NULL is the same as an empty ACL => DENY
4281 user_msgptr where to put a user error (for SMTP response)
4282 log_msgptr where to put a logging message (not for SMTP response)
4284 Returns: OK access is granted
4285 DISCARD access is apparently granted...
4286 FAIL access is denied
4287 FAIL_DROP access is denied; drop the connection
4288 DEFER can't tell at the moment
4293 acl_check_internal(int where, address_item *addr, uschar *s,
4294 uschar **user_msgptr, uschar **log_msgptr)
4297 acl_block *acl = NULL;
4298 uschar *acl_name = US"inline ACL";
4301 /* Catch configuration loops */
4305 *log_msgptr = US"ACL nested too deep: possible loop";
4311 HDEBUG(D_acl) debug_printf_indent("ACL is NULL: implicit DENY\n");
4315 /* At top level, we expand the incoming string. At lower levels, it has already
4316 been expanded as part of condition processing. */
4320 if (!(ss = expand_string(s)))
4322 if (f.expand_string_forcedfail) return OK;
4323 *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s,
4324 expand_string_message);
4330 while (isspace(*ss)) ss++;
4332 /* If we can't find a named ACL, the default is to parse it as an inline one.
4333 (Unless it begins with a slash; non-existent files give rise to an error.) */
4337 if (is_tainted(acl_text) && !f.running_in_test_harness)
4339 log_write(0, LOG_MAIN|LOG_PANIC,
4340 "attempt to use tainted ACL text \"%s\"", acl_text);
4341 /* Avoid leaking info to an attacker */
4342 *log_msgptr = US"internal configuration error";
4346 /* Handle the case of a string that does not contain any spaces. Look for a
4347 named ACL among those read from the configuration, or a previously read file.
4348 It is possible that the pointer to the ACL is NULL if the configuration
4349 contains a name with no data. If not found, and the text begins with '/',
4350 read an ACL from a file, and save it so it can be re-used. */
4352 if (Ustrchr(ss, ' ') == NULL)
4354 tree_node * t = tree_search(acl_anchor, ss);
4357 if (!(acl = (acl_block *)(t->data.ptr)))
4359 HDEBUG(D_acl) debug_printf_indent("ACL \"%s\" is empty: implicit DENY\n", ss);
4362 acl_name = string_sprintf("ACL \"%s\"", ss);
4363 HDEBUG(D_acl) debug_printf_indent("using ACL \"%s\"\n", ss);
4366 else if (*ss == '/')
4368 struct stat statbuf;
4369 if ((fd = Uopen(ss, O_RDONLY, 0)) < 0)
4371 *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss,
4375 if (fstat(fd, &statbuf) != 0)
4377 *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss,
4382 /* If the string being used as a filename is tainted, so is the file content */
4383 acl_text = store_get(statbuf.st_size + 1, ss);
4384 acl_text_end = acl_text + statbuf.st_size + 1;
4386 if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size)
4388 *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s",
4389 ss, strerror(errno));
4392 acl_text[statbuf.st_size] = 0;
4395 acl_name = string_sprintf("ACL \"%s\"", ss);
4396 HDEBUG(D_acl) debug_printf_indent("read ACL from file %s\n", ss);
4400 /* Parse an ACL that is still in text form. If it came from a file, remember it
4401 in the ACL tree, having read it into the POOL_PERM store pool so that it
4402 persists between multiple messages. */
4406 int old_pool = store_pool;
4407 if (fd >= 0) store_pool = POOL_PERM;
4408 acl = acl_read(acl_getline, log_msgptr);
4409 store_pool = old_pool;
4410 if (!acl && *log_msgptr) return ERROR;
4413 tree_node * t = store_get_perm(sizeof(tree_node) + Ustrlen(ss), ss);
4414 Ustrcpy(t->name, ss);
4416 (void)tree_insertnode(&acl_anchor, t);
4420 /* Now we have an ACL to use. It's possible it may be NULL. */
4422 while ((acl_current = acl))
4425 int basic_errno = 0;
4426 BOOL endpass_seen = FALSE;
4427 BOOL acl_quit_check = acl_level == 0
4428 && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT);
4430 *log_msgptr = *user_msgptr = NULL;
4431 f.acl_temp_details = FALSE;
4433 HDEBUG(D_acl) debug_printf_indent("processing \"%s\" (%s %d)\n",
4434 verbs[acl->verb], acl->srcfile, acl->srcline);
4436 /* Clear out any search error message from a previous check before testing
4439 search_error_message = NULL;
4440 cond = acl_check_condition(acl->verb, acl->condition, where, addr, acl_level,
4441 &endpass_seen, user_msgptr, log_msgptr, &basic_errno);
4443 /* Handle special returns: DEFER causes a return except on a WARN verb;
4444 ERROR always causes a return. */
4449 HDEBUG(D_acl) debug_printf_indent("%s: condition test deferred in %s\n",
4450 verbs[acl->verb], acl_name);
4451 if (basic_errno != ERRNO_CALLOUTDEFER)
4453 if (search_error_message != NULL && *search_error_message != 0)
4454 *log_msgptr = search_error_message;
4455 if (smtp_return_error_details) f.acl_temp_details = TRUE;
4458 f.acl_temp_details = TRUE;
4459 if (acl->verb != ACL_WARN) return DEFER;
4462 default: /* Paranoia */
4464 HDEBUG(D_acl) debug_printf_indent("%s: condition test error in %s\n",
4465 verbs[acl->verb], acl_name);
4469 HDEBUG(D_acl) debug_printf_indent("%s: condition test succeeded in %s\n",
4470 verbs[acl->verb], acl_name);
4474 HDEBUG(D_acl) debug_printf_indent("%s: condition test failed in %s\n",
4475 verbs[acl->verb], acl_name);
4478 /* DISCARD and DROP can happen only from a nested ACL condition, and
4479 DISCARD can happen only for an "accept" or "discard" verb. */
4482 HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"discard\" in %s\n",
4483 verbs[acl->verb], acl_name);
4487 HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"drop\" in %s\n",
4488 verbs[acl->verb], acl_name);
4492 /* At this point, cond for most verbs is either OK or FAIL or (as a result of
4493 a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and
4494 for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */
4499 if (cond == OK || cond == DISCARD)
4501 HDEBUG(D_acl) debug_printf_indent("end of %s: ACCEPT\n", acl_name);
4506 HDEBUG(D_acl) debug_printf_indent("accept: endpass encountered - denying access\n");
4514 HDEBUG(D_acl) debug_printf_indent("end of %s: DEFER\n", acl_name);
4515 if (acl_quit_check) goto badquit;
4516 f.acl_temp_details = TRUE;
4524 HDEBUG(D_acl) debug_printf_indent("end of %s: DENY\n", acl_name);
4525 if (acl_quit_check) goto badquit;
4531 if (cond == OK || cond == DISCARD)
4533 HDEBUG(D_acl) debug_printf_indent("end of %s: DISCARD\n", acl_name);
4534 if (acl_quit_check) goto badquit;
4540 debug_printf_indent("discard: endpass encountered - denying access\n");
4548 HDEBUG(D_acl) debug_printf_indent("end of %s: DROP\n", acl_name);
4549 if (acl_quit_check) goto badquit;
4557 HDEBUG(D_acl) debug_printf_indent("end of %s: not OK\n", acl_name);
4558 if (acl_quit_check) goto badquit;
4565 acl_warn(where, *user_msgptr, *log_msgptr);
4566 else if (cond == DEFER && LOGGING(acl_warn_skipped))
4567 log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: "
4568 "condition test deferred%s%s", host_and_ident(TRUE),
4569 *log_msgptr ? US": " : US"",
4570 *log_msgptr ? *log_msgptr : US"");
4571 *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */
4575 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d",
4580 /* Pass to the next ACL item */
4585 /* We have reached the end of the ACL. This is an implicit DENY. */
4587 HDEBUG(D_acl) debug_printf_indent("end of %s: implicit DENY\n", acl_name);
4591 *log_msgptr = string_sprintf("QUIT or not-QUIT toplevel ACL may not fail "
4592 "('%s' verb used incorrectly)", verbs[acl->verb]);
4599 /* Same args as acl_check_internal() above, but the string s is
4600 the name of an ACL followed optionally by up to 9 space-separated arguments.
4601 The name and args are separately expanded. Args go into $acl_arg globals. */
4603 acl_check_wargs(int where, address_item *addr, const uschar *s,
4604 uschar **user_msgptr, uschar **log_msgptr)
4607 uschar * tmp_arg[9]; /* must match acl_arg[] */
4608 uschar * sav_arg[9]; /* must match acl_arg[] */
4614 if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp)))
4617 for (i = 0; i < 9; i++)
4619 while (*s && isspace(*s)) s++;
4621 if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp)))
4628 sav_narg = acl_narg;
4630 for (i = 0; i < acl_narg; i++)
4632 sav_arg[i] = acl_arg[i];
4633 acl_arg[i] = tmp_arg[i];
4637 sav_arg[i] = acl_arg[i];
4638 acl_arg[i++] = NULL;
4642 ret = acl_check_internal(where, addr, name, user_msgptr, log_msgptr);
4645 acl_narg = sav_narg;
4646 for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i];
4650 if (f.expand_string_forcedfail) return ERROR;
4651 *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s",
4652 tmp, expand_string_message);
4653 return f.search_find_defer ? DEFER : ERROR;
4658 /*************************************************
4659 * Check access using an ACL *
4660 *************************************************/
4662 /* Alternate interface for ACL, used by expansions */
4664 acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr)
4667 address_item *addr = NULL;
4670 *user_msgptr = *log_msgptr = NULL;
4671 sender_verified_failed = NULL;
4672 ratelimiters_cmd = NULL;
4673 log_reject_target = LOG_MAIN|LOG_REJECT;
4675 if (where == ACL_WHERE_RCPT)
4677 adb = address_defaults;
4679 addr->address = expand_string(US"$local_part@$domain");
4680 addr->domain = deliver_domain;
4681 addr->local_part = deliver_localpart;
4682 addr->cc_local_part = deliver_localpart;
4683 addr->lc_local_part = deliver_localpart;
4687 rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr);
4694 /* This is the external interface for ACL checks. It sets up an address and the
4695 expansions for $domain and $local_part when called after RCPT, then calls
4696 acl_check_internal() to do the actual work.
4699 where ACL_WHERE_xxxx indicating where called from
4700 recipient RCPT address for RCPT check, else NULL
4701 s the input string; NULL is the same as an empty ACL => DENY
4702 user_msgptr where to put a user error (for SMTP response)
4703 log_msgptr where to put a logging message (not for SMTP response)
4705 Returns: OK access is granted by an ACCEPT verb
4706 DISCARD access is granted by a DISCARD verb
4707 FAIL access is denied
4708 FAIL_DROP access is denied; drop the connection
4709 DEFER can't tell at the moment
4712 int acl_where = ACL_WHERE_UNKNOWN;
4715 acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr,
4716 uschar **log_msgptr)
4720 address_item *addr = NULL;
4722 *user_msgptr = *log_msgptr = NULL;
4723 sender_verified_failed = NULL;
4724 ratelimiters_cmd = NULL;
4725 log_reject_target = LOG_MAIN|LOG_REJECT;
4727 #ifndef DISABLE_PRDR
4728 if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY || where==ACL_WHERE_PRDR)
4730 if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY)
4733 adb = address_defaults;
4735 addr->address = recipient;
4736 if (deliver_split_address(addr) == DEFER)
4738 *log_msgptr = US"defer in percent_hack_domains check";
4742 if ((addr->prop.utf8_msg = message_smtputf8))
4744 addr->prop.utf8_downcvt = message_utf8_downconvert == 1;
4745 addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1;
4748 deliver_domain = addr->domain;
4749 deliver_localpart = addr->local_part;
4754 rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr);
4756 acl_where = ACL_WHERE_UNKNOWN;
4758 /* Cutthrough - if requested,
4759 and WHERE_RCPT and not yet opened conn as result of recipient-verify,
4760 and rcpt acl returned accept,
4761 and first recipient (cancel on any subsequents)
4762 open one now and run it up to RCPT acceptance.
4763 A failed verify should cancel cutthrough request,
4764 and will pass the fail to the originator.
4765 Initial implementation: dual-write to spool.
4766 Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection.
4768 Cease cutthrough copy on rxd final dot; do not send one.
4770 On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness).
4772 On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or
4773 perm-rejected, reflect that to the original sender - and dump the spooled copy.
4774 If temp-reject, close the conn (and keep the spooled copy).
4775 If conn-failure, no action (and keep the spooled copy).
4779 case ACL_WHERE_RCPT:
4780 #ifndef DISABLE_PRDR
4781 case ACL_WHERE_PRDR:
4784 if (f.host_checking_callout) /* -bhc mode */
4785 cancel_cutthrough_connection(TRUE, US"host-checking mode");
4788 && cutthrough.delivery
4789 && rcpt_count > cutthrough.nrcpt
4792 if ((rc = open_cutthrough_connection(addr)) == DEFER)
4793 if (cutthrough.defer_pass)
4795 uschar * s = addr->message;
4796 /* Horrid kludge to recover target's SMTP message */
4798 do --s; while (!isdigit(*s));
4799 if (*--s && isdigit(*s) && *--s && isdigit(*s)) *user_msgptr = s;
4800 f.acl_temp_details = TRUE;
4804 HDEBUG(D_acl) debug_printf_indent("cutthrough defer; will spool\n");
4808 else HDEBUG(D_acl) if (cutthrough.delivery)
4809 if (rcpt_count <= cutthrough.nrcpt)
4810 debug_printf_indent("ignore cutthrough request; nonfirst message\n");
4812 debug_printf_indent("ignore cutthrough request; ACL did not accept\n");
4815 case ACL_WHERE_PREDATA:
4817 cutthrough_predata();
4819 cancel_cutthrough_connection(TRUE, US"predata acl not ok");
4822 case ACL_WHERE_QUIT:
4823 case ACL_WHERE_NOTQUIT:
4824 /* Drop cutthrough conns, and drop heldopen verify conns if
4825 the previous was not DATA */
4828 smtp_connection_had[SMTP_HBUFF_PREV(SMTP_HBUFF_PREV(smtp_ch_index))];
4829 BOOL dropverify = !(prev == SCH_DATA || prev == SCH_BDAT);
4831 cancel_cutthrough_connection(dropverify, US"quit or conndrop");
4839 deliver_domain = deliver_localpart = deliver_address_data =
4840 deliver_domain_data = sender_address_data = NULL;
4842 /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA
4843 ACL, which is really in the middle of an SMTP command. */
4847 if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA)
4849 log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s "
4850 "ACL", acl_wherenames[where]);
4856 /* A DROP response is not permitted from MAILAUTH */
4858 if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH)
4860 log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s "
4861 "ACL", acl_wherenames[where]);
4865 /* Before giving a response, take a look at the length of any user message, and
4866 split it up into multiple lines if possible. */
4868 *user_msgptr = string_split_message(*user_msgptr);
4869 if (fake_response != OK)
4870 fake_response_text = string_split_message(fake_response_text);
4876 /*************************************************
4877 * Create ACL variable *
4878 *************************************************/
4880 /* Create an ACL variable or reuse an existing one. ACL variables are in a
4881 binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes.
4884 name pointer to the variable's name, starting with c or m
4886 Returns the pointer to variable's tree node
4890 acl_var_create(uschar * name)
4892 tree_node * node, ** root = name[0] == 'c' ? &acl_var_c : &acl_var_m;
4893 if (!(node = tree_search(*root, name)))
4895 node = store_get(sizeof(tree_node) + Ustrlen(name), name);
4896 Ustrcpy(node->name, name);
4897 (void)tree_insertnode(root, node);
4899 node->data.ptr = NULL;
4905 /*************************************************
4906 * Write an ACL variable in spool format *
4907 *************************************************/
4909 /* This function is used as a callback for tree_walk when writing variables to
4910 the spool file. To retain spool file compatibility, what is written is -aclc or
4911 -aclm followed by the rest of the name and the data length, space separated,
4912 then the value itself, starting on a new line, and terminated by an additional
4913 newline. When we had only numbered ACL variables, the first line might look
4914 like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called
4918 name of the variable
4919 value of the variable
4920 ctx FILE pointer (as a void pointer)
4926 acl_var_write(uschar * name, uschar * value, void * ctx)
4928 FILE * f = (FILE *)ctx;
4930 if (is_tainted(value))
4932 int q = quoter_for_address(value);
4934 if (is_real_quoter(q)) fprintf(f, "(%s)", lookup_list[q]->name);
4936 fprintf(f, "acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value);
4943 acl_standalone_setvar(const uschar * s)
4945 acl_condition_block * cond = store_get(sizeof(acl_condition_block), GET_UNTAINTED);
4946 uschar * errstr = NULL, * log_msg = NULL;
4951 cond->type = ACLC_SET;
4952 if (!acl_varname_to_cond(&s, cond, &errstr)) return errstr;
4953 if (!acl_data_to_cond(s, cond, US"'-be'", &errstr)) return errstr;
4955 if (acl_check_condition(ACL_WARN, cond, ACL_WHERE_UNKNOWN,
4956 NULL, 0, &endpass_seen, &errstr, &log_msg, &e) != OK)
4957 return string_sprintf("oops: %s", errstr);
4958 return string_sprintf("variable %s set", cond->u.varname);
4962 #endif /* !MACRO_PREDEF */