-/* $Cambridge: exim/src/src/acl.c,v 1.75 2007/03/01 11:17:00 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2007 */
+/* Copyright (c) University of Cambridge 1995 - 2015 */
/* See the file NOTICE for conditions of use and distribution. */
/* Code for handling Access Control Lists (ACLs) */
/* ACL verbs */
-static uschar *verbs[] =
- { US"accept", US"defer", US"deny", US"discard", US"drop", US"require",
+static uschar *verbs[] = {
+ US"accept",
+ US"defer",
+ US"deny",
+ US"discard",
+ US"drop",
+ US"require",
US"warn" };
/* For each verb, the conditions for which "message" or "log_message" are used
ACLC_CONDITION,
ACLC_CONTINUE,
ACLC_CONTROL,
+#ifdef EXPERIMENTAL_DCC
+ ACLC_DCC,
+#endif
#ifdef WITH_CONTENT_SCAN
ACLC_DECODE,
#endif
#ifdef WITH_OLD_DEMIME
ACLC_DEMIME,
#endif
-#ifdef EXPERIMENTAL_DOMAINKEYS
- ACLC_DK_DOMAIN_SOURCE,
- ACLC_DK_POLICY,
- ACLC_DK_SENDER_DOMAINS,
- ACLC_DK_SENDER_LOCAL_PARTS,
- ACLC_DK_SENDERS,
- ACLC_DK_STATUS,
+#ifndef DISABLE_DKIM
+ ACLC_DKIM_SIGNER,
+ ACLC_DKIM_STATUS,
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ ACLC_DMARC_STATUS,
#endif
ACLC_DNSLISTS,
ACLC_DOMAINS,
#ifdef WITH_CONTENT_SCAN
ACLC_REGEX,
#endif
+ ACLC_REMOVE_HEADER,
ACLC_SENDER_DOMAINS,
ACLC_SENDERS,
ACLC_SET,
#endif
#ifdef EXPERIMENTAL_SPF
ACLC_SPF,
+ ACLC_SPF_GUESS,
#endif
+ ACLC_UDPSEND,
ACLC_VERIFY };
/* ACL conditions/modifiers: "delay", "control", "continue", "endpass",
US"condition",
US"continue",
US"control",
+#ifdef EXPERIMENTAL_DCC
+ US"dcc",
+#endif
#ifdef WITH_CONTENT_SCAN
US"decode",
#endif
#ifdef WITH_OLD_DEMIME
US"demime",
#endif
-#ifdef EXPERIMENTAL_DOMAINKEYS
- US"dk_domain_source",
- US"dk_policy",
- US"dk_sender_domains",
- US"dk_sender_local_parts",
- US"dk_senders",
- US"dk_status",
+#ifndef DISABLE_DKIM
+ US"dkim_signers",
+ US"dkim_status",
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ US"dmarc_status",
#endif
US"dnslists",
US"domains",
#ifdef WITH_CONTENT_SCAN
US"regex",
#endif
+ US"remove_header",
US"sender_domains", US"senders", US"set",
#ifdef WITH_CONTENT_SCAN
US"spam",
#endif
#ifdef EXPERIMENTAL_SPF
US"spf",
+ US"spf_guess",
#endif
+ US"udpsend",
US"verify" };
enum {
CONTROL_AUTH_UNADVERTISED,
- #ifdef EXPERIMENTAL_BRIGHTMAIL
+#ifdef EXPERIMENTAL_BRIGHTMAIL
CONTROL_BMI_RUN,
- #endif
- #ifdef EXPERIMENTAL_DOMAINKEYS
- CONTROL_DK_VERIFY,
- #endif
+#endif
+ CONTROL_DEBUG,
+#ifndef DISABLE_DKIM
+ CONTROL_DKIM_VERIFY,
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ CONTROL_DMARC_VERIFY,
+ CONTROL_DMARC_FORENSIC,
+#endif
+ CONTROL_DSCP,
CONTROL_ERROR,
CONTROL_CASEFUL_LOCAL_PART,
CONTROL_CASELOWER_LOCAL_PART,
+ CONTROL_CUTTHROUGH_DELIVERY,
CONTROL_ENFORCE_SYNC,
CONTROL_NO_ENFORCE_SYNC,
CONTROL_FREEZE,
CONTROL_QUEUE_ONLY,
CONTROL_SUBMISSION,
CONTROL_SUPPRESS_LOCAL_FIXUPS,
- #ifdef WITH_CONTENT_SCAN
+#ifdef WITH_CONTENT_SCAN
CONTROL_NO_MBOX_UNSPOOL,
- #endif
+#endif
CONTROL_FAKEDEFER,
CONTROL_FAKEREJECT,
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ CONTROL_UTF8_DOWNCONVERT,
+#endif
CONTROL_NO_MULTILINE,
CONTROL_NO_PIPELINING,
CONTROL_NO_DELAY_FLUSH,
static uschar *controls[] = {
US"allow_auth_unadvertised",
- #ifdef EXPERIMENTAL_BRIGHTMAIL
+#ifdef EXPERIMENTAL_BRIGHTMAIL
US"bmi_run",
- #endif
- #ifdef EXPERIMENTAL_DOMAINKEYS
- US"dk_verify",
- #endif
+#endif
+ US"debug",
+#ifndef DISABLE_DKIM
+ US"dkim_disable_verify",
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ US"dmarc_disable_verify",
+ US"dmarc_enable_forensic",
+#endif
+ US"dscp",
US"error",
US"caseful_local_part",
US"caselower_local_part",
+ US"cutthrough_delivery",
US"enforce_sync",
US"no_enforce_sync",
US"freeze",
US"queue_only",
US"submission",
US"suppress_local_fixups",
- #ifdef WITH_CONTENT_SCAN
+#ifdef WITH_CONTENT_SCAN
US"no_mbox_unspool",
- #endif
+#endif
US"fakedefer",
US"fakereject",
- US"no_multiline",
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ US"utf8_downconvert",
+#endif
+ US"no_multiline_responses",
US"no_pipelining",
US"no_delay_flush",
US"no_callout_flush"
checking functions. */
static uschar cond_expand_at_top[] = {
- TRUE, /* acl */
+ FALSE, /* acl */
TRUE, /* add_header */
FALSE, /* authenticated */
#ifdef EXPERIMENTAL_BRIGHTMAIL
TRUE, /* condition */
TRUE, /* continue */
TRUE, /* control */
+#ifdef EXPERIMENTAL_DCC
+ TRUE, /* dcc */
+#endif
#ifdef WITH_CONTENT_SCAN
TRUE, /* decode */
#endif
#ifdef WITH_OLD_DEMIME
TRUE, /* demime */
#endif
-#ifdef EXPERIMENTAL_DOMAINKEYS
- TRUE, /* dk_domain_source */
- TRUE, /* dk_policy */
- TRUE, /* dk_sender_domains */
- TRUE, /* dk_sender_local_parts */
- TRUE, /* dk_senders */
- TRUE, /* dk_status */
+#ifndef DISABLE_DKIM
+ TRUE, /* dkim_signers */
+ TRUE, /* dkim_status */
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ TRUE, /* dmarc_status */
#endif
TRUE, /* dnslists */
FALSE, /* domains */
#ifdef WITH_CONTENT_SCAN
TRUE, /* regex */
#endif
+ TRUE, /* remove_header */
FALSE, /* sender_domains */
FALSE, /* senders */
TRUE, /* set */
#endif
#ifdef EXPERIMENTAL_SPF
TRUE, /* spf */
+ TRUE, /* spf_guess */
#endif
+ TRUE, /* udpsend */
TRUE /* verify */
};
FALSE, /* condition */
TRUE, /* continue */
TRUE, /* control */
+#ifdef EXPERIMENTAL_DCC
+ FALSE, /* dcc */
+#endif
#ifdef WITH_CONTENT_SCAN
FALSE, /* decode */
#endif
#ifdef WITH_OLD_DEMIME
FALSE, /* demime */
#endif
-#ifdef EXPERIMENTAL_DOMAINKEYS
- FALSE, /* dk_domain_source */
- FALSE, /* dk_policy */
- FALSE, /* dk_sender_domains */
- FALSE, /* dk_sender_local_parts */
- FALSE, /* dk_senders */
- FALSE, /* dk_status */
+#ifndef DISABLE_DKIM
+ FALSE, /* dkim_signers */
+ FALSE, /* dkim_status */
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ FALSE, /* dmarc_status */
#endif
FALSE, /* dnslists */
FALSE, /* domains */
#ifdef WITH_CONTENT_SCAN
FALSE, /* regex */
#endif
+ TRUE, /* remove_header */
FALSE, /* sender_domains */
FALSE, /* senders */
TRUE, /* set */
#endif
#ifdef EXPERIMENTAL_SPF
FALSE, /* spf */
+ FALSE, /* spf_guess */
#endif
+ TRUE, /* udpsend */
FALSE /* verify */
};
/* Bit map vector of which conditions and modifiers are not allowed at certain
-times. For each condition, there's a bitmap of dis-allowed times. For some, it
-is easier to specify the negation of a small number of allowed times. */
+times. For each condition and modifier, there's a bitmap of dis-allowed times.
+For some, it is easier to specify the negation of a small number of allowed
+times. */
static unsigned int cond_forbids[] = {
0, /* acl */
(unsigned int)
~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */
(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
(1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)|
+ (1<<ACL_WHERE_DKIM)|
(1<<ACL_WHERE_NOTSMTP_START)),
(1<<ACL_WHERE_NOTSMTP)| /* authenticated */
(1<<ACL_WHERE_AUTH)| /* bmi_optin */
(1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
(1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)|
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
(1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
(1<<ACL_WHERE_MAILAUTH)|
(1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
0, /* control */
+ #ifdef EXPERIMENTAL_DCC
+ (unsigned int)
+ ~((1<<ACL_WHERE_DATA)| /* dcc */
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
+ (1<<ACL_WHERE_NOTSMTP)),
+ #endif
+
#ifdef WITH_CONTENT_SCAN
(unsigned int)
~(1<<ACL_WHERE_MIME), /* decode */
#endif
- 0, /* delay */
+ (1<<ACL_WHERE_NOTQUIT), /* delay */
#ifdef WITH_OLD_DEMIME
(unsigned int)
- ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */
+ ~((1<<ACL_WHERE_DATA)| /* demime */
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
+ (1<<ACL_WHERE_NOTSMTP)),
#endif
- #ifdef EXPERIMENTAL_DOMAINKEYS
- (1<<ACL_WHERE_AUTH)| /* dk_domain_source */
- (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
- (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)|
- (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
- (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
- (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
- (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START),
-
- (1<<ACL_WHERE_AUTH)| /* dk_policy */
- (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
- (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)|
- (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
- (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
- (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
- (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START),
-
- (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */
- (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
- (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)|
- (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
- (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
- (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
- (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START),
-
- (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */
- (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
- (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)|
- (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
- (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
- (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
- (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START),
+ #ifndef DISABLE_DKIM
+ (unsigned int)
+ ~(1<<ACL_WHERE_DKIM), /* dkim_signers */
- (1<<ACL_WHERE_AUTH)| /* dk_senders */
- (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
- (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)|
- (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
- (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
- (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
- (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START),
+ (unsigned int)
+ ~(1<<ACL_WHERE_DKIM), /* dkim_status */
+ #endif
- (1<<ACL_WHERE_AUTH)| /* dk_status */
- (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)|
- (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)|
- (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
- (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
- (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)|
- (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START),
+ #ifdef EXPERIMENTAL_DMARC
+ (unsigned int)
+ ~(1<<ACL_WHERE_DATA), /* dmarc_status */
#endif
(1<<ACL_WHERE_NOTSMTP)| /* dnslists */
(1<<ACL_WHERE_NOTSMTP_START),
(unsigned int)
- ~(1<<ACL_WHERE_RCPT), /* domains */
+ ~((1<<ACL_WHERE_RCPT) /* domains */
+ #ifndef DISABLE_PRDR
+ |(1<<ACL_WHERE_PRDR)
+ #endif
+ ),
(1<<ACL_WHERE_NOTSMTP)| /* encrypted */
(1<<ACL_WHERE_CONNECT)|
(1<<ACL_WHERE_NOTSMTP_START),
(unsigned int)
- ~(1<<ACL_WHERE_RCPT), /* local_parts */
+ ~((1<<ACL_WHERE_RCPT) /* local_parts */
+ #ifndef DISABLE_PRDR
+ |(1<<ACL_WHERE_PRDR)
+ #endif
+ ),
0, /* log_message */
#ifdef WITH_CONTENT_SCAN
(unsigned int)
- ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */
+ ~((1<<ACL_WHERE_DATA)| /* malware */
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
+ (1<<ACL_WHERE_NOTSMTP)),
#endif
0, /* message */
#ifdef WITH_CONTENT_SCAN
(unsigned int)
- ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */
+ ~((1<<ACL_WHERE_DATA)| /* regex */
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
+ (1<<ACL_WHERE_NOTSMTP)|
(1<<ACL_WHERE_MIME)),
#endif
+ (unsigned int)
+ ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* remove_header */
+ (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
+ (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)|
+ (1<<ACL_WHERE_NOTSMTP_START)),
+
(1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */
(1<<ACL_WHERE_HELO)|
(1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
#ifdef WITH_CONTENT_SCAN
(unsigned int)
- ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */
+ ~((1<<ACL_WHERE_DATA)| /* spam */
+ #ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+ #endif
+ (1<<ACL_WHERE_NOTSMTP)),
#endif
#ifdef EXPERIMENTAL_SPF
(1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)|
(1<<ACL_WHERE_NOTSMTP)|
(1<<ACL_WHERE_NOTSMTP_START),
+
+ (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf_guess */
+ (1<<ACL_WHERE_HELO)|
+ (1<<ACL_WHERE_MAILAUTH)|
+ (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)|
+ (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)|
+ (1<<ACL_WHERE_NOTSMTP)|
+ (1<<ACL_WHERE_NOTSMTP_START),
#endif
+ 0, /* udpsend */
+
/* Certain types of verify are always allowed, so we let it through
always and check in the verify function itself */
(unsigned int)
~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */
- #ifdef EXPERIMENTAL_BRIGHTMAIL
+#ifdef EXPERIMENTAL_BRIGHTMAIL
0, /* bmi_run */
- #endif
+#endif
- #ifdef EXPERIMENTAL_DOMAINKEYS
- (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dk_verify */
+ 0, /* debug */
+
+#ifndef DISABLE_DKIM
+ (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dkim_disable_verify */
+# ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+# endif
(1<<ACL_WHERE_NOTSMTP_START),
- #endif
+#endif
+
+#ifdef EXPERIMENTAL_DMARC
+ (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dmarc_disable_verify */
+ (1<<ACL_WHERE_NOTSMTP_START),
+ (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dmarc_enable_forensic */
+ (1<<ACL_WHERE_NOTSMTP_START),
+#endif
+
+ (1<<ACL_WHERE_NOTSMTP)|
+ (1<<ACL_WHERE_NOTSMTP_START)|
+ (1<<ACL_WHERE_NOTQUIT), /* dscp */
0, /* error */
(unsigned int)
~(1<<ACL_WHERE_RCPT), /* caselower_local_part */
+ (unsigned int)
+ 0, /* cutthrough_delivery */
+
(1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */
(1<<ACL_WHERE_NOTSMTP_START),
(unsigned int)
~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */
(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+ // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */
(1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)),
(unsigned int)
~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */
(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+ // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */
(1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)),
(unsigned int)
(1<<ACL_WHERE_PREDATA)|
(1<<ACL_WHERE_NOTSMTP_START)),
- #ifdef WITH_CONTENT_SCAN
+#ifdef WITH_CONTENT_SCAN
(unsigned int)
~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */
(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+ // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */
(1<<ACL_WHERE_MIME)),
- #endif
+#endif
(unsigned int)
~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */
(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+#ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+#endif
(1<<ACL_WHERE_MIME)),
(unsigned int)
~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */
(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+#ifndef DISABLE_PRDR
+ (1<<ACL_WHERE_PRDR)|
+#endif
(1<<ACL_WHERE_MIME)),
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ 0, /* utf8_downconvert */
+#endif
+
(1<<ACL_WHERE_NOTSMTP)| /* no_multiline */
(1<<ACL_WHERE_NOTSMTP_START),
} control_def;
static control_def controls_list[] = {
- { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE },
+ { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE },
#ifdef EXPERIMENTAL_BRIGHTMAIL
- { US"bmi_run", CONTROL_BMI_RUN, FALSE },
-#endif
-#ifdef EXPERIMENTAL_DOMAINKEYS
- { US"dk_verify", CONTROL_DK_VERIFY, FALSE },
-#endif
- { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE },
- { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE },
- { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE },
- { US"freeze", CONTROL_FREEZE, TRUE },
- { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE },
- { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE },
- { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE },
- { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE },
- { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE },
- { US"queue_only", CONTROL_QUEUE_ONLY, FALSE },
+ { US"bmi_run", CONTROL_BMI_RUN, FALSE },
+#endif
+ { US"debug", CONTROL_DEBUG, TRUE },
+#ifndef DISABLE_DKIM
+ { US"dkim_disable_verify", CONTROL_DKIM_VERIFY, FALSE },
+#endif
+#ifdef EXPERIMENTAL_DMARC
+ { US"dmarc_disable_verify", CONTROL_DMARC_VERIFY, FALSE },
+ { US"dmarc_enable_forensic", CONTROL_DMARC_FORENSIC, FALSE },
+#endif
+ { US"dscp", CONTROL_DSCP, TRUE },
+ { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE },
+ { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE },
+ { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE },
+ { US"freeze", CONTROL_FREEZE, TRUE },
+ { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE },
+ { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE },
+ { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE },
+ { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE },
+ { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE },
+ { US"queue_only", CONTROL_QUEUE_ONLY, FALSE },
#ifdef WITH_CONTENT_SCAN
- { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE },
+ { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE },
+#endif
+ { US"fakedefer", CONTROL_FAKEDEFER, TRUE },
+ { US"fakereject", CONTROL_FAKEREJECT, TRUE },
+ { US"submission", CONTROL_SUBMISSION, TRUE },
+ { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE },
+ { US"cutthrough_delivery", CONTROL_CUTTHROUGH_DELIVERY, FALSE },
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ { US"utf8_downconvert", CONTROL_UTF8_DOWNCONVERT, TRUE }
#endif
- { US"fakedefer", CONTROL_FAKEDEFER, TRUE },
- { US"fakereject", CONTROL_FAKEREJECT, TRUE },
- { US"submission", CONTROL_SUBMISSION, TRUE },
- { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE }
};
/* Support data structures for Client SMTP Authorization. acl_verify_csa()
US"failed (client address mismatch)"
};
+/* Options for the ratelimit condition. Note that there are two variants of
+the per_rcpt option, depending on the ACL that is used to measure the rate.
+However any ACL must be able to look up per_rcpt rates in /noupdate mode,
+so the two variants must have the same internal representation as well as
+the same configuration string. */
+
+enum {
+ RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD,
+ RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS
+};
+
+#define RATE_SET(var,new) \
+ (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH))
+
+static uschar *ratelimit_option_string[] = {
+ US"?", US"!", US"per_addr", US"per_byte", US"per_cmd",
+ US"per_conn", US"per_mail", US"per_rcpt", US"per_rcpt"
+};
+
/* Enable recursion between acl_check_internal() and acl_check_condition() */
-static int acl_check_internal(int, address_item *, uschar *, int, uschar **,
- uschar **);
+static int acl_check_wargs(int, address_item *, const uschar *, int, uschar **,
+ uschar **);
/*************************************************
*/
static void
-setup_header(uschar *hstring)
+setup_header(const uschar *hstring)
{
-uschar *p, *q;
+const uschar *p, *q;
int hlen = Ustrlen(hstring);
-/* An empty string does nothing; otherwise add a final newline if necessary. */
+/* Ignore any leading newlines */
+while (*hstring == '\n') hstring++, hlen--;
+/* An empty string does nothing; ensure exactly one final newline. */
if (hlen <= 0) return;
-if (hstring[hlen-1] != '\n') hstring = string_sprintf("%s\n", hstring);
+if (hstring[--hlen] != '\n')
+ q = string_sprintf("%s\n", hstring);
+else if (hstring[hlen-1] == '\n')
+ {
+ uschar * s = string_copy(hstring);
+ while(s[--hlen] == '\n')
+ s[hlen+1] = '\0';
+ q = s;
+ }
+else
+ q = hstring;
/* Loop for multiple header lines, taking care about continuations */
-for (p = q = hstring; *p != 0; )
+for (p = q; *p != 0; )
{
- uschar *s;
+ const uschar *s;
+ uschar * hdr;
int newtype = htype_add_bot;
header_line **hptr = &acl_added_headers;
if (*s == ':' || !isgraph(*s)) break;
}
- s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p);
- hlen = Ustrlen(s);
+ hdr = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", (int) (q - p), p);
+ hlen = Ustrlen(hdr);
/* See if this line has already been added */
while (*hptr != NULL)
{
- if (Ustrncmp((*hptr)->text, s, hlen) == 0) break;
+ if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break;
hptr = &((*hptr)->next);
}
if (*hptr == NULL)
{
header_line *h = store_get(sizeof(header_line));
- h->text = s;
+ h->text = hdr;
h->next = NULL;
h->type = newtype;
h->slen = hlen;
+/*************************************************
+* List the added header lines *
+*************************************************/
+uschar *
+fn_hdrs_added(void)
+{
+uschar * ret = NULL;
+header_line * h = acl_added_headers;
+uschar * s;
+uschar * cp;
+int size = 0;
+int ptr = 0;
+
+if (!h) return NULL;
+
+do
+ {
+ s = h->text;
+ while ((cp = Ustrchr(s, '\n')) != NULL)
+ {
+ if (cp[1] == '\0') break;
+
+ /* contains embedded newline; needs doubling */
+ ret = string_cat(ret, &size, &ptr, s, cp-s+1);
+ ret = string_cat(ret, &size, &ptr, US"\n", 1);
+ s = cp+1;
+ }
+ /* last bit of header */
+
+ ret = string_cat(ret, &size, &ptr, s, cp-s+1); /* newline-sep list */
+ }
+while((h = h->next));
+
+ret[ptr-1] = '\0'; /* overwrite last newline */
+return ret;
+}
+
+
+/*************************************************
+* Set up removed header line(s) *
+*************************************************/
+
+/* This function is called by the remove_header modifier. The argument is
+treated as a sequence of header names which are added to a colon separated
+list, provided there isn't an identical one already there.
+
+Argument: string of header names
+Returns: nothing
+*/
+
+static void
+setup_remove_header(const uschar *hnames)
+{
+if (*hnames != 0)
+ acl_removed_headers = acl_removed_headers
+ ? string_sprintf("%s : %s", acl_removed_headers, hnames)
+ : string_copy(hnames);
+}
+
+
/*************************************************
* Handle warnings *
if (rr->type != T_A
#if HAVE_IPV6
&& rr->type != T_AAAA
- #ifdef SUPPORT_A6
- && rr->type != T_A6
- #endif
#endif
) continue;
*/
static int
-acl_verify_csa(uschar *domain)
+acl_verify_csa(const uschar *domain)
{
tree_node *t;
-uschar *found, *p;
+const uschar *found;
+uschar *p;
int priority, weight, port;
dns_answer dnsa;
dns_scan dnss;
if (domain[0] == '[')
{
- uschar *start = Ustrchr(domain, ':');
+ const uschar *start = Ustrchr(domain, ':');
if (start == NULL) start = domain;
domain = string_copyn(start + 1, Ustrlen(start) - 2);
}
assertion: legitimate SMTP clients are all explicitly authorized with CSA
SRV records of their own. */
- if (found != domain)
+ if (Ustrcmp(found, domain) != 0)
{
if (port & 1)
return t->data.val = CSA_FAIL_EXPLICIT;
type = T_A;
-#if HAVE_IPV6 && defined(SUPPORT_A6)
-DNS_LOOKUP_AGAIN:
-#endif
-
+lookup_dnssec_authenticated = NULL;
switch (dns_lookup(&dnsa, target, type, NULL))
{
/* If something bad happened (most commonly DNS_AGAIN), defer. */
default:
- return t->data.val = CSA_DEFER_ADDR;
+ return t->data.val = CSA_DEFER_ADDR;
/* If the query succeeded, scan the addresses and return the result. */
case DNS_SUCCEED:
- rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target);
- if (rc != CSA_FAIL_NOADDR) return t->data.val = rc;
- /* else fall through */
+ rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target);
+ if (rc != CSA_FAIL_NOADDR) return t->data.val = rc;
+ /* else fall through */
/* If the target has no IP addresses, the client cannot have an authorized
IP address. However, if the target site uses A6 records (not AAAA records)
case DNS_NOMATCH:
case DNS_NODATA:
-
- #if HAVE_IPV6 && defined(SUPPORT_A6)
- if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; }
- #endif
-
- return t->data.val = CSA_FAIL_NOADDR;
+ return t->data.val = CSA_FAIL_NOADDR;
}
}
* Handle verification (address & other) *
*************************************************/
+enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX,
+ VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT,
+ VERIFY_HDR_NAMES_ASCII
+ };
+typedef struct {
+ uschar * name;
+ int value;
+ unsigned where_allowed; /* bitmap */
+ BOOL no_options; /* Never has /option(s) following */
+ unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */
+ } verify_type_t;
+static verify_type_t verify_type_list[] = {
+ { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, FALSE, 0 },
+ { US"certificate", VERIFY_CERT, ~0, TRUE, 0 },
+ { US"helo", VERIFY_HELO, ~0, TRUE, 0 },
+ { US"csa", VERIFY_CSA, ~0, FALSE, 0 },
+ { US"header_syntax", VERIFY_HDR_SYNTAX, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 },
+ { US"not_blind", VERIFY_NOT_BLIND, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 },
+ { US"header_sender", VERIFY_HDR_SNDR, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), FALSE, 0 },
+ { US"sender", VERIFY_SNDR, (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)
+ |(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP),
+ FALSE, 6 },
+ { US"recipient", VERIFY_RCPT, (1<<ACL_WHERE_RCPT), FALSE, 0 },
+ { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }
+ };
+
+
+enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER,
+ CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER,
+ CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT,
+ CALLOUT_TIME
+ };
+typedef struct {
+ uschar * name;
+ int value;
+ int flag;
+ BOOL has_option; /* Has =option(s) following */
+ BOOL timeval; /* Has a time value */
+ } callout_opt_t;
+static callout_opt_t callout_opt_list[] = {
+ { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE },
+ { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE },
+ { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE },
+ { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE },
+ { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE },
+ { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE },
+ { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE },
+ { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE },
+ { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE },
+ { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE },
+ { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE },
+ { NULL, CALLOUT_TIME, 0, FALSE, TRUE }
+ };
+
+
+
/* This function implements the "verify" condition. It is called when
encountered in any ACL, because some tests are almost always permitted. Some
just don't make sense, and always fail (for example, an attempt to test a host
*/
static int
-acl_verify(int where, address_item *addr, uschar *arg,
+acl_verify(int where, address_item *addr, const uschar *arg,
uschar **user_msgptr, uschar **log_msgptr, int *basic_errno)
{
int sep = '/';
uschar *se_mailfrom = NULL;
/* Some of the verify items have slash-separated options; some do not. Diagnose
-an error if options are given for items that don't expect them. This code has
-now got very message. Refactoring to use a table would be a good idea one day.
+an error if options are given for items that don't expect them.
*/
uschar *slash = Ustrchr(arg, '/');
-uschar *list = arg;
+const uschar *list = arg;
uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size);
+verify_type_t * vp;
if (ss == NULL) goto BAD_VERIFY;
/* Handle name/address consistency verification in a separate function. */
-if (strcmpic(ss, US"reverse_host_lookup") == 0)
+for (vp= verify_type_list;
+ (char *)vp < (char *)verify_type_list + sizeof(verify_type_list);
+ vp++
+ )
+ if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0
+ : strcmpic (ss, vp->name) == 0)
+ break;
+if ((char *)vp >= (char *)verify_type_list + sizeof(verify_type_list))
+ goto BAD_VERIFY;
+
+if (vp->no_options && slash != NULL)
{
- if (slash != NULL) goto NO_OPTIONS;
- if (sender_host_address == NULL) return OK;
- return acl_verify_reverse(user_msgptr, log_msgptr);
+ *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" "
+ "(this verify item has no options)", arg);
+ return ERROR;
}
-
-/* TLS certificate verification is done at STARTTLS time; here we just
-test whether it was successful or not. (This is for optional verification; for
-mandatory verification, the connection doesn't last this long.) */
-
-if (strcmpic(ss, US"certificate") == 0)
+if (!(vp->where_allowed & (1<<where)))
{
- if (slash != NULL) goto NO_OPTIONS;
- if (tls_certificate_verified) return OK;
- *user_msgptr = US"no verified certificate";
- return FAIL;
+ *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", vp->name, acl_wherenames[where]);
+ return ERROR;
}
-
-/* We can test the result of optional HELO verification that might have
-occurred earlier. If not, we can attempt the verification now. */
-
-if (strcmpic(ss, US"helo") == 0)
+switch(vp->value)
{
- if (slash != NULL) goto NO_OPTIONS;
- if (!helo_verified && !helo_verify_failed) smtp_verify_helo();
- return helo_verified? OK : FAIL;
- }
+ case VERIFY_REV_HOST_LKUP:
+ if (sender_host_address == NULL) return OK;
+ if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER)
+ while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)))
+ if (strcmpic(ss, US"defer_ok") == 0)
+ return OK;
+ return rc;
+
+ case VERIFY_CERT:
+ /* TLS certificate verification is done at STARTTLS time; here we just
+ test whether it was successful or not. (This is for optional verification; for
+ mandatory verification, the connection doesn't last this long.) */
+
+ if (tls_in.certificate_verified) return OK;
+ *user_msgptr = US"no verified certificate";
+ return FAIL;
-/* Do Client SMTP Authorization checks in a separate function, and turn the
-result code into user-friendly strings. */
+ case VERIFY_HELO:
+ /* We can test the result of optional HELO verification that might have
+ occurred earlier. If not, we can attempt the verification now. */
-if (strcmpic(ss, US"csa") == 0)
- {
- rc = acl_verify_csa(list);
- *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s",
- csa_reason_string[rc]);
- csa_status = csa_status_string[rc];
- DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status);
- return csa_return_code[rc];
- }
+ if (!helo_verified && !helo_verify_failed) smtp_verify_helo();
+ return helo_verified? OK : FAIL;
-/* Check that all relevant header lines have the correct syntax. If there is
-a syntax error, we return details of the error to the sender if configured to
-send out full details. (But a "message" setting on the ACL can override, as
-always). */
+ case VERIFY_CSA:
+ /* Do Client SMTP Authorization checks in a separate function, and turn the
+ result code into user-friendly strings. */
-if (strcmpic(ss, US"header_syntax") == 0)
- {
- if (slash != NULL) goto NO_OPTIONS;
- if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL;
- rc = verify_check_headers(log_msgptr);
- if (rc != OK && smtp_return_error_details && *log_msgptr != NULL)
- *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
- return rc;
- }
+ rc = acl_verify_csa(list);
+ *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s",
+ csa_reason_string[rc]);
+ csa_status = csa_status_string[rc];
+ DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status);
+ return csa_return_code[rc];
+
+ case VERIFY_HDR_SYNTAX:
+ /* Check that all relevant header lines have the correct syntax. If there is
+ a syntax error, we return details of the error to the sender if configured to
+ send out full details. (But a "message" setting on the ACL can override, as
+ always). */
+
+ rc = verify_check_headers(log_msgptr);
+ if (rc != OK && smtp_return_error_details && *log_msgptr != NULL)
+ *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
+ return rc;
-/* Check that no recipient of this message is "blind", that is, every envelope
-recipient must be mentioned in either To: or Cc:. */
+ case VERIFY_HDR_NAMES_ASCII:
+ /* Check that all header names are true 7 bit strings
+ See RFC 5322, 2.2. and RFC 6532, 3. */
-if (strcmpic(ss, US"not_blind") == 0)
- {
- if (slash != NULL) goto NO_OPTIONS;
- if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL;
- rc = verify_check_notblind();
- if (rc != OK)
- {
- *log_msgptr = string_sprintf("bcc recipient detected");
- if (smtp_return_error_details)
+ rc = verify_check_header_names_ascii(log_msgptr);
+ if (rc != OK && smtp_return_error_details && *log_msgptr != NULL)
*user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
- }
- return rc;
- }
+ return rc;
-/* The remaining verification tests check recipient and sender addresses,
-either from the envelope or from the header. There are a number of
-slash-separated options that are common to all of them. */
+ case VERIFY_NOT_BLIND:
+ /* Check that no recipient of this message is "blind", that is, every envelope
+ recipient must be mentioned in either To: or Cc:. */
+ rc = verify_check_notblind();
+ if (rc != OK)
+ {
+ *log_msgptr = string_sprintf("bcc recipient detected");
+ if (smtp_return_error_details)
+ *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr);
+ }
+ return rc;
-/* Check that there is at least one verifiable sender address in the relevant
-header lines. This can be followed by callout and defer options, just like
-sender and recipient. */
-
-if (strcmpic(ss, US"header_sender") == 0)
- {
- if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL;
- verify_header_sender = TRUE;
- }
+ /* The remaining verification tests check recipient and sender addresses,
+ either from the envelope or from the header. There are a number of
+ slash-separated options that are common to all of them. */
-/* Otherwise, first item in verify argument must be "sender" or "recipient".
-In the case of a sender, this can optionally be followed by an address to use
-in place of the actual sender (rare special-case requirement). */
+ case VERIFY_HDR_SNDR:
+ verify_header_sender = TRUE;
+ break;
-else if (strncmpic(ss, US"sender", 6) == 0)
- {
- uschar *s = ss + 6;
- if (where > ACL_WHERE_NOTSMTP)
- {
- *log_msgptr = string_sprintf("cannot verify sender in ACL for %s "
- "(only possible for MAIL, RCPT, PREDATA, or DATA)",
- acl_wherenames[where]);
- return ERROR;
- }
- if (*s == 0)
- verify_sender_address = sender_address;
- else
- {
- while (isspace(*s)) s++;
- if (*s++ != '=') goto BAD_VERIFY;
- while (isspace(*s)) s++;
- verify_sender_address = string_copy(s);
- }
- }
-else
- {
- if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY;
- if (addr == NULL)
+ case VERIFY_SNDR:
+ /* In the case of a sender, this can optionally be followed by an address to use
+ in place of the actual sender (rare special-case requirement). */
{
- *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s "
- "(only possible for RCPT)", acl_wherenames[where]);
- return ERROR;
+ uschar *s = ss + 6;
+ if (*s == 0)
+ verify_sender_address = sender_address;
+ else
+ {
+ while (isspace(*s)) s++;
+ if (*s++ != '=') goto BAD_VERIFY;
+ while (isspace(*s)) s++;
+ verify_sender_address = string_copy(s);
+ }
}
+ break;
+
+ case VERIFY_RCPT:
+ break;
}
+
+
/* Remaining items are optional; they apply to sender and recipient
verification, including "header sender" verification. */
while (isspace(*ss)) ss++;
if (*ss++ == '=')
{
+ const uschar * sublist = ss;
int optsep = ',';
uschar *opt;
uschar buffer[256];
- while (isspace(*ss)) ss++;
+ while (isspace(*sublist)) sublist++;
- /* This callout option handling code has become a mess as new options
- have been added in an ad hoc manner. It should be tidied up into some
- kind of table-driven thing. */
-
- while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer)))
+ while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer)))
!= NULL)
{
- if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE;
- else if (strcmpic(opt, US"no_cache") == 0)
- verify_options |= vopt_callout_no_cache;
- else if (strcmpic(opt, US"random") == 0)
- verify_options |= vopt_callout_random;
- else if (strcmpic(opt, US"use_sender") == 0)
- verify_options |= vopt_callout_recipsender;
- else if (strcmpic(opt, US"use_postmaster") == 0)
- verify_options |= vopt_callout_recippmaster;
- else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US"";
- else if (strcmpic(opt, US"fullpostmaster") == 0)
- {
- pm_mailfrom = US"";
- verify_options |= vopt_callout_fullpm;
- }
+ callout_opt_t * op;
+ double period = 1.0F;
- else if (strncmpic(opt, US"mailfrom", 8) == 0)
- {
- if (!verify_header_sender)
- {
- *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a "
- "callout option only for verify=header_sender (detected in ACL "
- "condition \"%s\")", arg);
- return ERROR;
- }
- opt += 8;
- while (isspace(*opt)) opt++;
- if (*opt++ != '=')
- {
- *log_msgptr = string_sprintf("'=' expected after "
- "\"mailfrom\" in ACL condition \"%s\"", arg);
- return ERROR;
- }
- while (isspace(*opt)) opt++;
- se_mailfrom = string_copy(opt);
- }
+ for (op= callout_opt_list; op->name; op++)
+ if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0)
+ break;
- else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0)
- {
- opt += 19;
+ verify_options |= op->flag;
+ if (op->has_option)
+ {
+ opt += Ustrlen(op->name);
while (isspace(*opt)) opt++;
if (*opt++ != '=')
{
*log_msgptr = string_sprintf("'=' expected after "
- "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg);
+ "\"%s\" in ACL verify condition \"%s\"", op->name, arg);
return ERROR;
}
while (isspace(*opt)) opt++;
- pm_mailfrom = string_copy(opt);
- }
-
- else if (strncmpic(opt, US"maxwait", 7) == 0)
- {
- opt += 7;
- while (isspace(*opt)) opt++;
- if (*opt++ != '=')
- {
- *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in "
- "ACL condition \"%s\"", arg);
- return ERROR;
- }
- while (isspace(*opt)) opt++;
- callout_overall = readconf_readtime(opt, 0, FALSE);
- if (callout_overall < 0)
+ }
+ if (op->timeval)
+ {
+ period = readconf_readtime(opt, 0, FALSE);
+ if (period < 0)
{
*log_msgptr = string_sprintf("bad time value in ACL condition "
"\"verify %s\"", arg);
return ERROR;
}
- }
- else if (strncmpic(opt, US"connect", 7) == 0)
- {
- opt += 7;
- while (isspace(*opt)) opt++;
- if (*opt++ != '=')
- {
- *log_msgptr = string_sprintf("'=' expected after "
- "\"callout_overaall\" in ACL condition \"%s\"", arg);
- return ERROR;
- }
- while (isspace(*opt)) opt++;
- callout_connect = readconf_readtime(opt, 0, FALSE);
- if (callout_connect < 0)
- {
- *log_msgptr = string_sprintf("bad time value in ACL condition "
- "\"verify %s\"", arg);
- return ERROR;
- }
- }
- else /* Plain time is callout connect/command timeout */
- {
- callout = readconf_readtime(opt, 0, FALSE);
- if (callout < 0)
- {
- *log_msgptr = string_sprintf("bad time value in ACL condition "
- "\"verify %s\"", arg);
- return ERROR;
- }
- }
+ }
+
+ switch(op->value)
+ {
+ case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break;
+ case CALLOUT_POSTMASTER: pm_mailfrom = US""; break;
+ case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break;
+ case CALLOUT_MAILFROM:
+ if (!verify_header_sender)
+ {
+ *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a "
+ "callout option only for verify=header_sender (detected in ACL "
+ "condition \"%s\")", arg);
+ return ERROR;
+ }
+ se_mailfrom = string_copy(opt);
+ break;
+ case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break;
+ case CALLOUT_MAXWAIT: callout_overall = period; break;
+ case CALLOUT_CONNECT: callout_connect = period; break;
+ case CALLOUT_TIME: callout = period; break;
+ }
}
}
else
uschar *save_address_data = deliver_address_data;
sender_vaddr = deliver_make_addr(verify_sender_address, TRUE);
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ if ((sender_vaddr->prop.utf8_msg = message_smtputf8))
+ {
+ sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1;
+ sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1;
+ }
+#endif
if (no_details) setflag(sender_vaddr, af_sverify_told);
if (verify_sender_address[0] != 0)
{
/* Put the sender address_data value into $sender_address_data */
- sender_address_data = sender_vaddr->p.address_data;
+ sender_address_data = sender_vaddr->prop.address_data;
}
/* A recipient address just gets a straightforward verify; again we must handle
if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE;
/* Make $address_data visible */
- deliver_address_data = addr2.p.address_data;
+ deliver_address_data = addr2.prop.address_data;
}
/* We have a result from the relevant test. Handle defer overrides first. */
if (rc != OK && verify_sender_address != NULL)
{
if (rc != DEFER)
- {
*log_msgptr = *user_msgptr = US"Sender verify failed";
- }
else if (*basic_errno != ERRNO_CALLOUTDEFER)
- {
*log_msgptr = *user_msgptr = US"Could not complete sender verify";
- }
else
{
*log_msgptr = US"Could not complete sender verify callout";
BAD_VERIFY:
*log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", "
- "\"helo\", \"header_syntax\", \"header_sender\" or "
- "\"reverse_host_lookup\" at start of ACL condition "
+ "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" "
+ "or \"reverse_host_lookup\" at start of ACL condition "
"\"verify %s\"", arg);
return ERROR;
-
-/* Options supplied when not allowed come here */
-
-NO_OPTIONS:
-*log_msgptr = string_sprintf("unexpected '/' found in \"%s\" "
- "(this verify item has no options)", arg);
-return ERROR;
-
-/* Calls in the wrong ACL come here */
-
-WRONG_ACL:
-*log_msgptr = string_sprintf("cannot check header contents in ACL for %s "
- "(only possible in ACL for DATA)", acl_wherenames[where]);
-return ERROR;
}
*/
static int
-decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr)
+decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr)
{
int len;
control_def *d;
+
+/*************************************************
+* Return a ratelimit error *
+*************************************************/
+
+/* Called from acl_ratelimit() below
+
+Arguments:
+ log_msgptr for error messages
+ format format string
+ ... supplementary arguments
+ ss ratelimit option name
+ where ACL_WHERE_xxxx indicating which ACL this is
+
+Returns: ERROR
+*/
+
+static int
+ratelimit_error(uschar **log_msgptr, const char *format, ...)
+{
+va_list ap;
+uschar buffer[STRING_SPRINTF_BUFFER_SIZE];
+va_start(ap, format);
+if (!string_vformat(buffer, sizeof(buffer), format, ap))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer));
+va_end(ap);
+*log_msgptr = string_sprintf(
+ "error in arguments to \"ratelimit\" condition: %s", buffer);
+return ERROR;
+}
+
+
+
+
/*************************************************
* Handle rate limiting *
*************************************************/
*/
static int
-acl_ratelimit(uschar *arg, int where, uschar **log_msgptr)
+acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr)
{
-double limit, period;
-uschar *ss, *key;
+double limit, period, count;
+uschar *ss;
+uschar *key = NULL;
+uschar *unique = NULL;
int sep = '/';
-BOOL have_key = FALSE, leaky = FALSE, strict = FALSE;
-BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE;
+BOOL leaky = FALSE, strict = FALSE, readonly = FALSE;
+BOOL noupdate = FALSE, badacl = FALSE;
+int mode = RATE_PER_WHAT;
int old_pool, rc;
tree_node **anchor, *t;
open_db dbblock, *dbm;
+int dbdb_size;
dbdata_ratelimit *dbd;
+dbdata_ratelimit_unique *dbdb;
struct timeval tv;
/* Parse the first two options and record their values in expansion
variables. These variables allow the configuration to have informative
error messages based on rate limits obtained from a table lookup. */
-/* First is the maximum number of messages per period and maximum burst
+/* First is the maximum number of messages per period / maximum burst
size, which must be greater than or equal to zero. Zero is useful for
rate measurement as opposed to rate limiting. */
sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0);
if (sender_rate_limit == NULL)
+ {
limit = -1.0;
+ ss = NULL; /* compiler quietening */
+ }
else
{
limit = Ustrtod(sender_rate_limit, &ss);
else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; }
else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; }
}
-if (limit < 0.0 || *ss != 0)
- {
- *log_msgptr = string_sprintf("syntax error in argument for "
- "\"ratelimit\" condition: \"%s\" is not a positive number",
- sender_rate_limit);
- return ERROR;
- }
+if (limit < 0.0 || *ss != '\0')
+ return ratelimit_error(log_msgptr,
+ "\"%s\" is not a positive number", sender_rate_limit);
-/* We use the rest of the argument list following the limit as the
-lookup key, because it doesn't make sense to use the same stored data
-if the period or options are different. */
-
-key = arg;
-
-/* Second is the rate measurement period and exponential smoothing time
+/* Second is the rate measurement period / exponential smoothing time
constant. This must be strictly greater than zero, because zero leads to
run-time division errors. */
if (sender_rate_period == NULL) period = -1.0;
else period = readconf_readtime(sender_rate_period, 0, FALSE);
if (period <= 0.0)
- {
- *log_msgptr = string_sprintf("syntax error in argument for "
- "\"ratelimit\" condition: \"%s\" is not a time value",
- sender_rate_period);
- return ERROR;
- }
+ return ratelimit_error(log_msgptr,
+ "\"%s\" is not a time value", sender_rate_period);
+
+/* By default we are counting one of something, but the per_rcpt,
+per_byte, and count options can change this. */
-/* Parse the other options. Should we check if the per_* options are being
-used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */
+count = 1.0;
+
+/* Parse the other options. */
while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size))
!= NULL)
{
if (strcmpic(ss, US"leaky") == 0) leaky = TRUE;
else if (strcmpic(ss, US"strict") == 0) strict = TRUE;
- else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE;
- else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE;
- else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE;
- else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE;
- else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */
- else have_key = TRUE;
- }
-if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1)
- {
- *log_msgptr = US"conflicting options for \"ratelimit\" condition";
- return ERROR;
+ else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE;
+ else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE;
+ else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD);
+ else if (strcmpic(ss, US"per_conn") == 0)
+ {
+ RATE_SET(mode, PER_CONN);
+ if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START)
+ badacl = TRUE;
+ }
+ else if (strcmpic(ss, US"per_mail") == 0)
+ {
+ RATE_SET(mode, PER_MAIL);
+ if (where > ACL_WHERE_NOTSMTP) badacl = TRUE;
+ }
+ else if (strcmpic(ss, US"per_rcpt") == 0)
+ {
+ /* If we are running in the RCPT ACL, then we'll count the recipients
+ one by one, but if we are running when we have accumulated the whole
+ list then we'll add them all in one batch. */
+ if (where == ACL_WHERE_RCPT)
+ RATE_SET(mode, PER_RCPT);
+ else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP)
+ RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count;
+ else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP)
+ RATE_SET(mode, PER_RCPT), badacl = TRUE;
+ }
+ else if (strcmpic(ss, US"per_byte") == 0)
+ {
+ /* If we have not yet received the message data and there was no SIZE
+ declaration on the MAIL comand, then it's safe to just use a value of
+ zero and let the recorded rate decay as if nothing happened. */
+ RATE_SET(mode, PER_MAIL);
+ if (where > ACL_WHERE_NOTSMTP) badacl = TRUE;
+ else count = message_size < 0 ? 0.0 : (double)message_size;
+ }
+ else if (strcmpic(ss, US"per_addr") == 0)
+ {
+ RATE_SET(mode, PER_RCPT);
+ if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*";
+ else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain);
+ }
+ else if (strncmpic(ss, US"count=", 6) == 0)
+ {
+ uschar *e;
+ count = Ustrtod(ss+6, &e);
+ if (count < 0.0 || *e != '\0')
+ return ratelimit_error(log_msgptr,
+ "\"%s\" is not a positive number", ss);
+ }
+ else if (strncmpic(ss, US"unique=", 7) == 0)
+ unique = string_copy(ss + 7);
+ else if (key == NULL)
+ key = string_copy(ss);
+ else
+ key = string_sprintf("%s/%s", key, ss);
}
-/* Default option values */
-if (!strict) leaky = TRUE;
-if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE;
+/* Sanity check. When the badacl flag is set the update mode must either
+be readonly (which is the default if it is omitted) or, for backwards
+compatibility, a combination of noupdate and strict or leaky. */
+
+if (mode == RATE_PER_CLASH)
+ return ratelimit_error(log_msgptr, "conflicting per_* options");
+if (leaky + strict + readonly > 1)
+ return ratelimit_error(log_msgptr, "conflicting update modes");
+if (badacl && (leaky || strict) && !noupdate)
+ return ratelimit_error(log_msgptr,
+ "\"%s\" must not have /leaky or /strict option in %s ACL",
+ ratelimit_option_string[mode], acl_wherenames[where]);
+
+/* Set the default values of any unset options. In readonly mode we
+perform the rate computation without any increment so that its value
+decays to eventually allow over-limit senders through. */
+
+if (noupdate) readonly = TRUE, leaky = strict = FALSE;
+if (badacl) readonly = TRUE;
+if (readonly) count = 0.0;
+if (!strict && !readonly) leaky = TRUE;
+if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL;
+
+/* Create the lookup key. If there is no explicit key, use sender_host_address.
+If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply
+omit it. The smoothing constant (sender_rate_period) and the per_xxx options
+are added to the key because they alter the meaning of the stored data. */
+
+if (key == NULL)
+ key = (sender_host_address == NULL)? US"" : sender_host_address;
+
+key = string_sprintf("%s/%s/%s%s",
+ sender_rate_period,
+ ratelimit_option_string[mode],
+ unique == NULL ? "" : "unique/",
+ key);
-/* If there is no explicit key, use the sender_host_address. If there is no
-sender_host_address (e.g. -bs or acl_not_smtp) then we simply omit it. */
-
-if (!have_key && sender_host_address != NULL)
- key = string_sprintf("%s / %s", key, sender_host_address);
-
-HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n",
- limit, period, key);
+HDEBUG(D_acl)
+ debug_printf("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key);
-/* See if we have already computed the rate by looking in the relevant tree. For
-per-connection rate limiting, store tree nodes and dbdata in the permanent pool
-so that they survive across resets. */
+/* See if we have already computed the rate by looking in the relevant tree.
+For per-connection rate limiting, store tree nodes and dbdata in the permanent
+pool so that they survive across resets. In readonly mode we only remember the
+result for the rest of this command in case a later command changes it. After
+this bit of logic the code is independent of the per_* mode. */
-anchor = NULL;
old_pool = store_pool;
-if (per_conn)
- {
+if (readonly)
+ anchor = &ratelimiters_cmd;
+else switch(mode) {
+case RATE_PER_CONN:
anchor = &ratelimiters_conn;
store_pool = POOL_PERM;
- }
-else if (per_mail || per_byte)
+ break;
+case RATE_PER_BYTE:
+case RATE_PER_MAIL:
+case RATE_PER_ALLRCPTS:
anchor = &ratelimiters_mail;
-else if (per_cmd)
+ break;
+case RATE_PER_ADDR:
+case RATE_PER_CMD:
+case RATE_PER_RCPT:
anchor = &ratelimiters_cmd;
+ break;
+default:
+ anchor = NULL; /* silence an "unused" complaint */
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "internal ACL error: unknown ratelimit mode %d", mode);
+ break;
+}
-if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL)
+t = tree_search(*anchor, key);
+if (t != NULL)
{
dbd = t->data.ptr;
/* The following few lines duplicate some of the code below. */
- if (dbd->rate < limit) rc = FAIL;
- else rc = OK;
+ rc = (dbd->rate < limit)? FAIL : OK;
store_pool = old_pool;
sender_rate = string_sprintf("%.1f", dbd->rate);
HDEBUG(D_acl)
return rc;
}
-/* We aren't using a pre-computed rate, so get a previously recorded
-rate from the database, update it, and write it back. If there's no
-previous rate for this key, create one. */
+/* We aren't using a pre-computed rate, so get a previously recorded rate
+from the database, which will be updated and written back if required. */
dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE);
if (dbm == NULL)
*log_msgptr = US"ratelimit database not available";
return DEFER;
}
-dbd = dbfn_read(dbm, key);
+dbdb = dbfn_read_with_length(dbm, key, &dbdb_size);
+dbd = NULL;
gettimeofday(&tv, NULL);
+if (dbdb != NULL)
+ {
+ /* Locate the basic ratelimit block inside the DB data. */
+ HDEBUG(D_acl) debug_printf("ratelimit found key in database\n");
+ dbd = &dbdb->dbd;
+
+ /* Forget the old Bloom filter if it is too old, so that we count each
+ repeating event once per period. We don't simply clear and re-use the old
+ filter because we want its size to change if the limit changes. Note that
+ we keep the dbd pointer for copying the rate into the new data block. */
+
+ if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period)
+ {
+ HDEBUG(D_acl) debug_printf("ratelimit discarding old Bloom filter\n");
+ dbdb = NULL;
+ }
+
+ /* Sanity check. */
+
+ if(unique != NULL && dbdb_size < sizeof(*dbdb))
+ {
+ HDEBUG(D_acl) debug_printf("ratelimit discarding undersize Bloom filter\n");
+ dbdb = NULL;
+ }
+ }
+
+/* Allocate a new data block if the database lookup failed
+or the Bloom filter passed its age limit. */
+
+if (dbdb == NULL)
+ {
+ if (unique == NULL)
+ {
+ /* No Bloom filter. This basic ratelimit block is initialized below. */
+ HDEBUG(D_acl) debug_printf("ratelimit creating new rate data block\n");
+ dbdb_size = sizeof(*dbd);
+ dbdb = store_get(dbdb_size);
+ }
+ else
+ {
+ int extra;
+ HDEBUG(D_acl) debug_printf("ratelimit creating new Bloom filter\n");
+
+ /* See the long comment below for an explanation of the magic number 2.
+ The filter has a minimum size in case the rate limit is very small;
+ this is determined by the definition of dbdata_ratelimit_unique. */
+
+ extra = (int)limit * 2 - sizeof(dbdb->bloom);
+ if (extra < 0) extra = 0;
+ dbdb_size = sizeof(*dbdb) + extra;
+ dbdb = store_get(dbdb_size);
+ dbdb->bloom_epoch = tv.tv_sec;
+ dbdb->bloom_size = sizeof(dbdb->bloom) + extra;
+ memset(dbdb->bloom, 0, dbdb->bloom_size);
+
+ /* Preserve any basic ratelimit data (which is our longer-term memory)
+ by copying it from the discarded block. */
+
+ if (dbd != NULL)
+ {
+ dbdb->dbd = *dbd;
+ dbd = &dbdb->dbd;
+ }
+ }
+ }
+
+/* If we are counting unique events, find out if this event is new or not.
+If the client repeats the event during the current period then it should be
+counted. We skip this code in readonly mode for efficiency, because any
+changes to the filter will be discarded and because count is already set to
+zero. */
+
+if (unique != NULL && !readonly)
+ {
+ /* We identify unique events using a Bloom filter. (You can find my
+ notes on Bloom filters at http://fanf.livejournal.com/81696.html)
+ With the per_addr option, an "event" is a recipient address, though the
+ user can use the unique option to define their own events. We only count
+ an event if we have not seen it before.
+
+ We size the filter according to the rate limit, which (in leaky mode)
+ is the limit on the population of the filter. We allow 16 bits of space
+ per entry (see the construction code above) and we set (up to) 8 of them
+ when inserting an element (see the loop below). The probability of a false
+ positive (an event we have not seen before but which we fail to count) is
+
+ size = limit * 16
+ numhash = 8
+ allzero = exp(-numhash * pop / size)
+ = exp(-0.5 * pop / limit)
+ fpr = pow(1 - allzero, numhash)
+
+ For senders at the limit the fpr is 0.06% or 1 in 1700
+ and for senders at half the limit it is 0.0006% or 1 in 170000
+
+ In strict mode the Bloom filter can fill up beyond the normal limit, in
+ which case the false positive rate will rise. This means that the
+ measured rate for very fast senders can bogusly drop off after a while.
+
+ At twice the limit, the fpr is 2.5% or 1 in 40
+ At four times the limit, it is 31% or 1 in 3.2
+
+ It takes ln(pop/limit) periods for an over-limit burst of pop events to
+ decay below the limit, and if this is more than one then the Bloom filter
+ will be discarded before the decay gets that far. The false positive rate
+ at this threshold is 9.3% or 1 in 10.7. */
+
+ BOOL seen;
+ unsigned n, hash, hinc;
+ uschar md5sum[16];
+ md5 md5info;
+
+ /* Instead of using eight independent hash values, we combine two values
+ using the formula h1 + n * h2. This does not harm the Bloom filter's
+ performance, and means the amount of hash we need is independent of the
+ number of bits we set in the filter. */
+
+ md5_start(&md5info);
+ md5_end(&md5info, unique, Ustrlen(unique), md5sum);
+ hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24;
+ hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24;
+
+ /* Scan the bits corresponding to this event. A zero bit means we have
+ not seen it before. Ensure all bits are set to record this event. */
+
+ HDEBUG(D_acl) debug_printf("ratelimit checking uniqueness of %s\n", unique);
+
+ seen = TRUE;
+ for (n = 0; n < 8; n++, hash += hinc)
+ {
+ int bit = 1 << (hash % 8);
+ int byte = (hash / 8) % dbdb->bloom_size;
+ if ((dbdb->bloom[byte] & bit) == 0)
+ {
+ dbdb->bloom[byte] |= bit;
+ seen = FALSE;
+ }
+ }
+
+ /* If this event has occurred before, do not count it. */
+
+ if (seen)
+ {
+ HDEBUG(D_acl) debug_printf("ratelimit event found in Bloom filter\n");
+ count = 0.0;
+ }
+ else
+ HDEBUG(D_acl) debug_printf("ratelimit event added to Bloom filter\n");
+ }
+
+/* If there was no previous ratelimit data block for this key, initialize
+the new one, otherwise update the block from the database. The initial rate
+is what would be computed by the code below for an infinite interval. */
+
if (dbd == NULL)
{
- HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n");
- dbd = store_get(sizeof(dbdata_ratelimit));
+ HDEBUG(D_acl) debug_printf("ratelimit initializing new key's rate data\n");
+ dbd = &dbdb->dbd;
dbd->time_stamp = tv.tv_sec;
dbd->time_usec = tv.tv_usec;
- dbd->rate = 0.0;
+ dbd->rate = count;
}
else
{
double i_over_p = interval / period;
double a = exp(-i_over_p);
+ /* Combine the instantaneous rate (period / interval) with the previous rate
+ using the smoothing factor a. In order to measure sized events, multiply the
+ instantaneous rate by the count of bytes or recipients etc. */
+
dbd->time_stamp = tv.tv_sec;
dbd->time_usec = tv.tv_usec;
-
- /* If we are measuring the rate in bytes per period, multiply the
- measured rate by the message size. If we don't know the message size
- then it's safe to just use a value of zero and let the recorded rate
- decay as if nothing happened. */
-
- if (per_byte)
- dbd->rate = (message_size < 0 ? 0.0 : (double)message_size)
- * (1 - a) / i_over_p + a * dbd->rate;
- else if (per_cmd && where == ACL_WHERE_NOTSMTP)
- dbd->rate = (double)recipients_count
- * (1 - a) / i_over_p + a * dbd->rate;
- else
- dbd->rate = (1 - a) / i_over_p + a * dbd->rate;
+ dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate;
+
+ /* When events are very widely spaced the computed rate tends towards zero.
+ Although this is accurate it turns out not to be useful for our purposes,
+ especially when the first event after a long silence is the start of a spam
+ run. A more useful model is that the rate for an isolated event should be the
+ size of the event per the period size, ignoring the lack of events outside
+ the current period and regardless of where the event falls in the period. So,
+ if the interval was so long that the calculated rate is unhelpfully small, we
+ re-intialize the rate. In the absence of higher-rate bursts, the condition
+ below is true if the interval is greater than the period. */
+
+ if (dbd->rate < count) dbd->rate = count;
}
-/* Clients sending at the limit are considered to be over the limit. This
-matters for edge cases such the first message sent by a client (which gets
-the initial rate of 0.0) when the rate limit is zero (i.e. the client should
-be completely blocked). */
+/* Clients sending at the limit are considered to be over the limit.
+This matters for edge cases such as a limit of zero, when the client
+should be completely blocked. */
-if (dbd->rate < limit) rc = FAIL;
- else rc = OK;
+rc = (dbd->rate < limit)? FAIL : OK;
/* Update the state if the rate is low or if we are being strict. If we
are in leaky mode and the sender's rate is too high, we do not update
the recorded rate in order to avoid an over-aggressive sender's retry
-rate preventing them from getting any email through. */
+rate preventing them from getting any email through. If readonly is set,
+neither leaky nor strict are set, so we do not do any updates. */
+
+if ((rc == FAIL && leaky) || strict)
+ {
+ dbfn_write(dbm, key, dbdb, dbdb_size);
+ HDEBUG(D_acl) debug_printf("ratelimit db updated\n");
+ }
+else
+ {
+ HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n",
+ readonly? "readonly mode" : "over the limit, but leaky");
+ }
-if (rc == FAIL || !leaky)
- dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit));
dbfn_close(dbm);
-/* Store the result in the tree for future reference, if necessary. */
+/* Store the result in the tree for future reference. */
-if (anchor != NULL)
- {
- t = store_get(sizeof(tree_node) + Ustrlen(key));
- t->data.ptr = dbd;
- Ustrcpy(t->name, key);
- (void)tree_insertnode(anchor, t);
- }
+t = store_get(sizeof(tree_node) + Ustrlen(key));
+t->data.ptr = dbd;
+Ustrcpy(t->name, key);
+(void)tree_insertnode(anchor, t);
/* We create the formatted version of the sender's rate very late in
order to ensure that it is done using the correct storage pool. */
+/*************************************************
+* The udpsend ACL modifier *
+*************************************************/
+
+/* Called by acl_check_condition() below.
+
+Arguments:
+ arg the option string for udpsend=
+ log_msgptr for error messages
+
+Returns: OK - Completed.
+ DEFER - Problem with DNS lookup.
+ ERROR - Syntax error in options.
+*/
+
+static int
+acl_udpsend(const uschar *arg, uschar **log_msgptr)
+{
+int sep = 0;
+uschar *hostname;
+uschar *portstr;
+uschar *portend;
+host_item *h;
+int portnum;
+int len;
+int r, s;
+uschar * errstr;
+
+hostname = string_nextinlist(&arg, &sep, NULL, 0);
+portstr = string_nextinlist(&arg, &sep, NULL, 0);
+
+if (hostname == NULL)
+ {
+ *log_msgptr = US"missing destination host in \"udpsend\" modifier";
+ return ERROR;
+ }
+if (portstr == NULL)
+ {
+ *log_msgptr = US"missing destination port in \"udpsend\" modifier";
+ return ERROR;
+ }
+if (arg == NULL)
+ {
+ *log_msgptr = US"missing datagram payload in \"udpsend\" modifier";
+ return ERROR;
+ }
+portnum = Ustrtol(portstr, &portend, 10);
+if (*portend != '\0')
+ {
+ *log_msgptr = US"bad destination port in \"udpsend\" modifier";
+ return ERROR;
+ }
+
+/* Make a single-item host list. */
+h = store_get(sizeof(host_item));
+memset(h, 0, sizeof(host_item));
+h->name = hostname;
+h->port = portnum;
+h->mx = MX_NONE;
+
+if (string_is_ip_address(hostname, NULL))
+ h->address = hostname, r = HOST_FOUND;
+else
+ r = host_find_byname(h, NULL, 0, NULL, FALSE);
+if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN)
+ {
+ *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier";
+ return DEFER;
+ }
+
+HDEBUG(D_acl)
+ debug_printf("udpsend [%s]:%d %s\n", h->address, portnum, arg);
+
+r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum,
+ 1, NULL, &errstr);
+if (r < 0) goto defer;
+len = Ustrlen(arg);
+r = send(s, arg, len, 0);
+if (r < 0)
+ {
+ errstr = US strerror(errno);
+ close(s);
+ goto defer;
+ }
+close(s);
+if (r < len)
+ {
+ *log_msgptr =
+ string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r);
+ return DEFER;
+ }
+
+HDEBUG(D_acl)
+ debug_printf("udpsend %d bytes\n", r);
+
+return OK;
+
+defer:
+*log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr);
+return DEFER;
+}
+
+
+
/*************************************************
* Handle conditions/modifiers on an ACL item *
*************************************************/
{
uschar *user_message = NULL;
uschar *log_message = NULL;
-uschar *p = NULL;
+uschar *debug_tag = NULL;
+uschar *debug_opts = NULL;
int rc = OK;
#ifdef WITH_CONTENT_SCAN
-int sep = '/';
+int sep = -'/';
#endif
for (; cb != NULL; cb = cb->next)
{
- uschar *arg;
+ const uschar *arg;
int control_type;
/* The message and log_message items set up messages to be used in
if (cb->type == ACLC_MESSAGE)
{
+ HDEBUG(D_acl) debug_printf(" message: %s\n", cb->arg);
user_message = cb->arg;
continue;
}
if (cb->type == ACLC_LOG_MESSAGE)
{
+ HDEBUG(D_acl) debug_printf("l_message: %s\n", cb->arg);
log_message = cb->arg;
continue;
}
"discard" verb. */
case ACLC_ACL:
- rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr);
- if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD)
- {
- *log_msgptr = string_sprintf("nested ACL returned \"discard\" for "
- "\"%s\" command (only allowed with \"accept\" or \"discard\")",
- verbs[verb]);
- return ERROR;
- }
+ rc = acl_check_wargs(where, addr, arg, level+1, user_msgptr, log_msgptr);
+ if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD)
+ {
+ *log_msgptr = string_sprintf("nested ACL returned \"discard\" for "
+ "\"%s\" command (only allowed with \"accept\" or \"discard\")",
+ verbs[verb]);
+ return ERROR;
+ }
break;
case ACLC_AUTHENTICATED:
#endif
case ACLC_CONDITION:
- if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */
+ /* The true/false parsing here should be kept in sync with that used in
+ expand.c when dealing with ECOND_BOOL so that we don't have too many
+ different definitions of what can be a boolean. */
+ if (*arg == '-'
+ ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */
+ : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */
rc = (Uatoi(arg) == 0)? FAIL : OK;
else
rc = (strcmpic(arg, US"no") == 0 ||
break;
case ACLC_CONTROL:
- control_type = decode_control(arg, &p, where, log_msgptr);
-
- /* Check if this control makes sense at this time */
-
- if ((control_forbids[control_type] & (1 << where)) != 0)
- {
- *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL",
- controls[control_type], acl_wherenames[where]);
- return ERROR;
- }
-
- switch(control_type)
{
- case CONTROL_AUTH_UNADVERTISED:
- allow_auth_unadvertised = TRUE;
- break;
-
- #ifdef EXPERIMENTAL_BRIGHTMAIL
- case CONTROL_BMI_RUN:
- bmi_run = 1;
- break;
- #endif
-
- #ifdef EXPERIMENTAL_DOMAINKEYS
- case CONTROL_DK_VERIFY:
- dk_do_verify = 1;
- break;
- #endif
-
- case CONTROL_ERROR:
- return ERROR;
-
- case CONTROL_CASEFUL_LOCAL_PART:
- deliver_localpart = addr->cc_local_part;
- break;
-
- case CONTROL_CASELOWER_LOCAL_PART:
- deliver_localpart = addr->lc_local_part;
- break;
-
- case CONTROL_ENFORCE_SYNC:
- smtp_enforce_sync = TRUE;
- break;
-
- case CONTROL_NO_ENFORCE_SYNC:
- smtp_enforce_sync = FALSE;
- break;
-
- #ifdef WITH_CONTENT_SCAN
- case CONTROL_NO_MBOX_UNSPOOL:
- no_mbox_unspool = TRUE;
- break;
- #endif
-
- case CONTROL_NO_MULTILINE:
- no_multiline_responses = TRUE;
- break;
-
- case CONTROL_NO_PIPELINING:
- pipelining_enable = FALSE;
- break;
-
- case CONTROL_NO_DELAY_FLUSH:
- disable_delay_flush = TRUE;
- break;
-
- case CONTROL_NO_CALLOUT_FLUSH:
- disable_callout_flush = TRUE;
- break;
-
- case CONTROL_FAKEDEFER:
- case CONTROL_FAKEREJECT:
- fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL;
- if (*p == '/')
- {
- uschar *pp = p + 1;
- while (*pp != 0) pp++;
- fake_response_text = expand_string(string_copyn(p+1, pp-p-1));
- p = pp;
- }
- else
- {
- /* Explicitly reset to default string */
- 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).";
- }
- break;
-
- case CONTROL_FREEZE:
- deliver_freeze = TRUE;
- deliver_frozen_at = time(NULL);
- freeze_tell = freeze_tell_config; /* Reset to configured value */
- if (Ustrncmp(p, "/no_tell", 8) == 0)
- {
- p += 8;
- freeze_tell = NULL;
- }
- if (*p != 0)
- {
- *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
- return ERROR;
- }
- break;
+ const uschar *p = NULL;
+ control_type = decode_control(arg, &p, where, log_msgptr);
+
+ /* Check if this control makes sense at this time */
+
+ if ((control_forbids[control_type] & (1 << where)) != 0)
+ {
+ *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL",
+ controls[control_type], acl_wherenames[where]);
+ return ERROR;
+ }
+
+ switch(control_type)
+ {
+ case CONTROL_AUTH_UNADVERTISED:
+ allow_auth_unadvertised = TRUE;
+ break;
+
+ #ifdef EXPERIMENTAL_BRIGHTMAIL
+ case CONTROL_BMI_RUN:
+ bmi_run = 1;
+ break;
+ #endif
+
+ #ifndef DISABLE_DKIM
+ case CONTROL_DKIM_VERIFY:
+ dkim_disable_verify = TRUE;
+ #ifdef EXPERIMENTAL_DMARC
+ /* Since DKIM was blocked, skip DMARC too */
+ dmarc_disable_verify = TRUE;
+ dmarc_enable_forensic = FALSE;
+ #endif
+ break;
+ #endif
+
+ #ifdef EXPERIMENTAL_DMARC
+ case CONTROL_DMARC_VERIFY:
+ dmarc_disable_verify = TRUE;
+ break;
+
+ case CONTROL_DMARC_FORENSIC:
+ dmarc_enable_forensic = TRUE;
+ break;
+ #endif
+
+ case CONTROL_DSCP:
+ if (*p == '/')
+ {
+ int fd, af, level, optname, value;
+ /* If we are acting on stdin, the setsockopt may fail if stdin is not
+ a socket; we can accept that, we'll just debug-log failures anyway. */
+ fd = fileno(smtp_in);
+ af = ip_get_address_family(fd);
+ if (af < 0)
+ {
+ HDEBUG(D_acl)
+ debug_printf("smtp input is probably not a socket [%s], not setting DSCP\n",
+ strerror(errno));
+ break;
+ }
+ if (dscp_lookup(p+1, af, &level, &optname, &value))
+ {
+ if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0)
+ {
+ HDEBUG(D_acl) debug_printf("failed to set input DSCP[%s]: %s\n",
+ p+1, strerror(errno));
+ }
+ else
+ {
+ HDEBUG(D_acl) debug_printf("set input DSCP to \"%s\"\n", p+1);
+ }
+ }
+ else
+ {
+ *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg);
+ return ERROR;
+ }
+ }
+ else
+ {
+ *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
+ return ERROR;
+ }
+ break;
+
+ case CONTROL_ERROR:
+ return ERROR;
+
+ case CONTROL_CASEFUL_LOCAL_PART:
+ deliver_localpart = addr->cc_local_part;
+ break;
+
+ case CONTROL_CASELOWER_LOCAL_PART:
+ deliver_localpart = addr->lc_local_part;
+ break;
+
+ case CONTROL_ENFORCE_SYNC:
+ smtp_enforce_sync = TRUE;
+ break;
+
+ case CONTROL_NO_ENFORCE_SYNC:
+ smtp_enforce_sync = FALSE;
+ break;
+
+ #ifdef WITH_CONTENT_SCAN
+ case CONTROL_NO_MBOX_UNSPOOL:
+ no_mbox_unspool = TRUE;
+ break;
+ #endif
+
+ case CONTROL_NO_MULTILINE:
+ no_multiline_responses = TRUE;
+ break;
+
+ case CONTROL_NO_PIPELINING:
+ pipelining_enable = FALSE;
+ break;
+
+ case CONTROL_NO_DELAY_FLUSH:
+ disable_delay_flush = TRUE;
+ break;
+
+ case CONTROL_NO_CALLOUT_FLUSH:
+ disable_callout_flush = TRUE;
+ break;
+
+ case CONTROL_FAKEREJECT:
+ cancel_cutthrough_connection("fakereject");
+ case CONTROL_FAKEDEFER:
+ fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL;
+ if (*p == '/')
+ {
+ const uschar *pp = p + 1;
+ while (*pp != 0) pp++;
+ fake_response_text = expand_string(string_copyn(p+1, pp-p-1));
+ p = pp;
+ }
+ else
+ {
+ /* Explicitly reset to default string */
+ 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).";
+ }
+ break;
+
+ case CONTROL_FREEZE:
+ deliver_freeze = TRUE;
+ deliver_frozen_at = time(NULL);
+ freeze_tell = freeze_tell_config; /* Reset to configured value */
+ if (Ustrncmp(p, "/no_tell", 8) == 0)
+ {
+ p += 8;
+ freeze_tell = NULL;
+ }
+ if (*p != 0)
+ {
+ *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
+ return ERROR;
+ }
+ cancel_cutthrough_connection("item frozen");
+ break;
+
+ case CONTROL_QUEUE_ONLY:
+ queue_only_policy = TRUE;
+ cancel_cutthrough_connection("queueing forced");
+ break;
+
+ case CONTROL_SUBMISSION:
+ originator_name = US"";
+ submission_mode = TRUE;
+ while (*p == '/')
+ {
+ if (Ustrncmp(p, "/sender_retain", 14) == 0)
+ {
+ p += 14;
+ active_local_sender_retain = TRUE;
+ active_local_from_check = FALSE;
+ }
+ else if (Ustrncmp(p, "/domain=", 8) == 0)
+ {
+ const uschar *pp = p + 8;
+ while (*pp != 0 && *pp != '/') pp++;
+ submission_domain = string_copyn(p+8, pp-p-8);
+ p = pp;
+ }
+ /* The name= option must be last, because it swallows the rest of
+ the string. */
+ else if (Ustrncmp(p, "/name=", 6) == 0)
+ {
+ const uschar *pp = p + 6;
+ while (*pp != 0) pp++;
+ submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6,
+ big_buffer, big_buffer_size));
+ p = pp;
+ }
+ else break;
+ }
+ if (*p != 0)
+ {
+ *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
+ return ERROR;
+ }
+ break;
+
+ case CONTROL_DEBUG:
+ while (*p == '/')
+ {
+ if (Ustrncmp(p, "/tag=", 5) == 0)
+ {
+ const uschar *pp = p + 5;
+ while (*pp != '\0' && *pp != '/') pp++;
+ debug_tag = string_copyn(p+5, pp-p-5);
+ p = pp;
+ }
+ else if (Ustrncmp(p, "/opts=", 6) == 0)
+ {
+ const uschar *pp = p + 6;
+ while (*pp != '\0' && *pp != '/') pp++;
+ debug_opts = string_copyn(p+6, pp-p-6);
+ p = pp;
+ }
+ }
+ debug_logging_activate(debug_tag, debug_opts);
+ break;
+
+ case CONTROL_SUPPRESS_LOCAL_FIXUPS:
+ suppress_local_fixups = TRUE;
+ break;
+
+ case CONTROL_CUTTHROUGH_DELIVERY:
+ if (prdr_requested)
+ /* Too hard to think about for now. We might in future cutthrough
+ the case where both sides handle prdr and this-node prdr acl
+ is "accept" */
+ *log_msgptr = string_sprintf("PRDR on %s reception\n", arg);
+ else
+ {
+ if (deliver_freeze)
+ *log_msgptr = US"frozen";
+ else if (queue_only_policy)
+ *log_msgptr = US"queue-only";
+ else if (fake_response == FAIL)
+ *log_msgptr = US"fakereject";
+ else
+ {
+ if (rcpt_count == 1) cutthrough.delivery = TRUE;
+ break;
+ }
+ *log_msgptr = string_sprintf("\"control=%s\" on %s item",
+ arg, *log_msgptr);
+ }
+ return ERROR;
+
+ #ifdef EXPERIMENTAL_INTERNATIONAL
+ case CONTROL_UTF8_DOWNCONVERT:
+ if (*p == '/')
+ {
+ if (p[1] == '1')
+ {
+ message_utf8_downconvert = 1;
+ addr->prop.utf8_downcvt = TRUE;
+ addr->prop.utf8_downcvt_maybe = FALSE;
+ p += 2;
+ break;
+ }
+ if (p[1] == '0')
+ {
+ message_utf8_downconvert = 0;
+ addr->prop.utf8_downcvt = FALSE;
+ addr->prop.utf8_downcvt_maybe = FALSE;
+ p += 2;
+ break;
+ }
+ if (p[1] == '-' && p[2] == '1')
+ {
+ message_utf8_downconvert = -1;
+ addr->prop.utf8_downcvt = FALSE;
+ addr->prop.utf8_downcvt_maybe = TRUE;
+ p += 3;
+ break;
+ }
+ *log_msgptr = US"bad option value for control=utf8_downconvert";
+ }
+ else
+ {
+ message_utf8_downconvert = 1;
+ addr->prop.utf8_downcvt = TRUE;
+ addr->prop.utf8_downcvt_maybe = FALSE;
+ break;
+ }
+ return ERROR;
+ #endif
- case CONTROL_QUEUE_ONLY:
- queue_only_policy = TRUE;
- break;
-
- case CONTROL_SUBMISSION:
- originator_name = US"";
- submission_mode = TRUE;
- while (*p == '/')
- {
- if (Ustrncmp(p, "/sender_retain", 14) == 0)
- {
- p += 14;
- active_local_sender_retain = TRUE;
- active_local_from_check = FALSE;
- }
- else if (Ustrncmp(p, "/domain=", 8) == 0)
- {
- uschar *pp = p + 8;
- while (*pp != 0 && *pp != '/') pp++;
- submission_domain = string_copyn(p+8, pp-p-8);
- p = pp;
- }
- /* The name= option must be last, because it swallows the rest of
- the string. */
- else if (Ustrncmp(p, "/name=", 6) == 0)
- {
- uschar *pp = p + 6;
- while (*pp != 0) pp++;
- submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6,
- big_buffer, big_buffer_size));
- p = pp;
- }
- else break;
- }
- if (*p != 0)
- {
- *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg);
- return ERROR;
- }
+ }
break;
+ }
- case CONTROL_SUPPRESS_LOCAL_FIXUPS:
- suppress_local_fixups = TRUE;
- break;
+ #ifdef EXPERIMENTAL_DCC
+ case ACLC_DCC:
+ {
+ /* Seperate the regular expression and any optional parameters. */
+ const uschar * list = arg;
+ uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size);
+ /* Run the dcc backend. */
+ rc = dcc_process(&ss);
+ /* Modify return code based upon the existance of options. */
+ while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)))
+ if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER)
+ rc = FAIL; /* FAIL so that the message is passed to the next ACL */
}
break;
+ #endif
#ifdef WITH_CONTENT_SCAN
case ACLC_DECODE:
break;
#endif
- #ifdef EXPERIMENTAL_DOMAINKEYS
- case ACLC_DK_DOMAIN_SOURCE:
- if (dk_verify_block == NULL) { rc = FAIL; break; };
- /* check header source of domain against given string */
- switch (dk_verify_block->address_source) {
- case DK_EXIM_ADDRESS_FROM_FROM:
- rc = match_isinlist(US"from", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_ADDRESS_FROM_SENDER:
- rc = match_isinlist(US"sender", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_ADDRESS_NONE:
- rc = match_isinlist(US"none", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- }
- break;
-
- case ACLC_DK_POLICY:
- if (dk_verify_block == NULL) { rc = FAIL; break; };
- /* check policy against given string, default FAIL */
- rc = FAIL;
- if (dk_verify_block->signsall)
- rc = match_isinlist(US"signsall", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- if (dk_verify_block->testing)
- rc = match_isinlist(US"testing", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
-
- case ACLC_DK_SENDER_DOMAINS:
- if (dk_verify_block == NULL) { rc = FAIL; break; };
- if (dk_verify_block->domain != NULL)
- rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor,
- NULL, MCL_DOMAIN, TRUE, NULL);
- else rc = FAIL;
- break;
-
- case ACLC_DK_SENDER_LOCAL_PARTS:
- if (dk_verify_block == NULL) { rc = FAIL; break; };
- if (dk_verify_block->local_part != NULL)
- rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor,
- NULL, MCL_LOCALPART, TRUE, NULL);
- else rc = FAIL;
+ #ifndef DISABLE_DKIM
+ case ACLC_DKIM_SIGNER:
+ if (dkim_cur_signer != NULL)
+ rc = match_isinlist(dkim_cur_signer,
+ &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL);
+ else
+ rc = FAIL;
break;
- case ACLC_DK_SENDERS:
- if (dk_verify_block == NULL) { rc = FAIL; break; };
- if (dk_verify_block->address != NULL)
- rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL);
- else rc = FAIL;
+ case ACLC_DKIM_STATUS:
+ rc = match_isinlist(dkim_exim_expand_query(DKIM_VERIFY_STATUS),
+ &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL);
break;
+ #endif
- case ACLC_DK_STATUS:
- if (dk_verify_block == NULL) { rc = FAIL; break; };
- if (dk_verify_block->result > 0) {
- switch(dk_verify_block->result) {
- case DK_EXIM_RESULT_BAD_FORMAT:
- rc = match_isinlist(US"bad format", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_RESULT_NO_KEY:
- rc = match_isinlist(US"no key", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_RESULT_NO_SIGNATURE:
- rc = match_isinlist(US"no signature", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_RESULT_REVOKED:
- rc = match_isinlist(US"revoked", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_RESULT_NON_PARTICIPANT:
- rc = match_isinlist(US"non-participant", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_RESULT_GOOD:
- rc = match_isinlist(US"good", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- case DK_EXIM_RESULT_BAD:
- rc = match_isinlist(US"bad", &arg, 0, NULL,
- NULL, MCL_STRING, TRUE, NULL);
- break;
- }
- }
+ #ifdef EXPERIMENTAL_DMARC
+ case ACLC_DMARC_STATUS:
+ if (!dmarc_has_been_checked)
+ dmarc_process();
+ dmarc_has_been_checked = TRUE;
+ /* used long way of dmarc_exim_expand_query() in case we need more
+ * view into the process in the future. */
+ rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS),
+ &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL);
break;
#endif
case ACLC_DOMAINS:
rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor,
- addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data);
+ addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data);
break;
/* The value in tls_cipher is the full cipher name, for example,
writing is poorly documented. */
case ACLC_ENCRYPTED:
- if (tls_cipher == NULL) rc = FAIL; else
+ if (tls_in.cipher == NULL) rc = FAIL; else
{
uschar *endcipher = NULL;
- uschar *cipher = Ustrchr(tls_cipher, ':');
- if (cipher == NULL) cipher = tls_cipher; else
+ uschar *cipher = Ustrchr(tls_in.cipher, ':');
+ if (cipher == NULL) cipher = tls_in.cipher; else
{
endcipher = Ustrchr(++cipher, ':');
if (endcipher != NULL) *endcipher = 0;
case ACLC_HOSTS:
rc = verify_check_this_host(&arg, sender_host_cache, NULL,
- (sender_host_address == NULL)? US"" : sender_host_address, &host_data);
- if (host_data != NULL) host_data = string_copy_malloc(host_data);
+ (sender_host_address == NULL)? US"" : sender_host_address,
+ CUSS &host_data);
+ if (rc == DEFER) *log_msgptr = search_error_message;
+ if (host_data) host_data = string_copy_malloc(host_data);
break;
case ACLC_LOCAL_PARTS:
rc = match_isinlist(addr->cc_local_part, &arg, 0,
&localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE,
- &deliver_localpart_data);
+ CUSS &deliver_localpart_data);
break;
case ACLC_LOG_REJECT_TARGET:
{
int logbits = 0;
int sep = 0;
- uschar *s = arg;
+ const uschar *s = arg;
uschar *ss;
- while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size))
- != NULL)
+ while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)))
{
if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN;
else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC;
case ACLC_LOGWRITE:
{
int logbits = 0;
- uschar *s = arg;
+ const uschar *s = arg;
if (*s == ':')
{
s++;
break;
#ifdef WITH_CONTENT_SCAN
- case ACLC_MALWARE:
+ case ACLC_MALWARE: /* Run the malware backend. */
{
/* Separate the regular expression and any optional parameters. */
- uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size);
- /* Run the malware backend. */
- rc = malware(&ss);
- /* Modify return code based upon the existance of options. */
- while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size))
- != NULL) {
- if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER)
- {
- /* FAIL so that the message is passed to the next ACL */
- rc = FAIL;
- }
- }
+ const uschar * list = arg;
+ uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size);
+ uschar *opt;
+ BOOL defer_ok = FALSE;
+ int timeout = 0;
+
+ while ((opt = string_nextinlist(&list, &sep, NULL, 0)))
+ if (strcmpic(opt, US"defer_ok") == 0)
+ defer_ok = TRUE;
+ else if ( strncmpic(opt, US"tmo=", 4) == 0
+ && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0
+ )
+ {
+ *log_msgptr = string_sprintf("bad timeout value in '%s'", opt);
+ return ERROR;
+ }
+
+ rc = malware(ss, timeout);
+ if (rc == DEFER && defer_ok)
+ rc = FAIL; /* FAIL so that the message is passed to the next ACL */
}
break;
break;
case ACLC_RECIPIENTS:
- rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0,
- &recipient_data);
+ rc = match_address_list((const uschar *)addr->address, TRUE, TRUE, &arg, NULL, -1, 0,
+ CUSS &recipient_data);
break;
#ifdef WITH_CONTENT_SCAN
break;
#endif
+ case ACLC_REMOVE_HEADER:
+ setup_remove_header(arg);
+ break;
+
case ACLC_SENDER_DOMAINS:
{
uschar *sdomain;
break;
case ACLC_SENDERS:
- rc = match_address_list(sender_address, TRUE, TRUE, &arg,
- sender_address_cache, -1, 0, &sender_data);
+ rc = match_address_list((const uschar *)sender_address, TRUE, TRUE, &arg,
+ sender_address_cache, -1, 0, CUSS &sender_data);
break;
/* Connection variables must persist forever */
case ACLC_SPAM:
{
/* Seperate the regular expression and any optional parameters. */
- uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size);
+ const uschar * list = arg;
+ uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size);
/* Run the spam backend. */
- rc = spam(&ss);
+ rc = spam(CUSS &ss);
/* Modify return code based upon the existance of options. */
- while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size))
+ while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))
!= NULL) {
if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER)
{
#ifdef EXPERIMENTAL_SPF
case ACLC_SPF:
- rc = spf_process(&arg, sender_address);
+ rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL);
+ break;
+ case ACLC_SPF_GUESS:
+ rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS);
break;
#endif
+ case ACLC_UDPSEND:
+ rc = acl_udpsend(arg, log_msgptr);
+ break;
+
/* If the verb is WARN, discard any user message from verification, because
such messages are SMTP responses, not header additions. The latter come
only from explicit "message" modifiers. However, put the user message into
int cond;
int basic_errno = 0;
BOOL endpass_seen = FALSE;
+ BOOL acl_quit_check = level == 0
+ && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT);
*log_msgptr = *user_msgptr = NULL;
acl_temp_details = FALSE;
- if (where == ACL_WHERE_QUIT &&
- acl->verb != ACL_ACCEPT &&
- acl->verb != ACL_WARN)
- {
- *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT ACL",
- verbs[acl->verb]);
- return ERROR;
- }
-
HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]);
/* Clear out any search error message from a previous check before testing
switch (cond)
{
case DEFER:
- HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]);
+ HDEBUG(D_acl) debug_printf("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name);
if (basic_errno != ERRNO_CALLOUTDEFER)
{
if (search_error_message != NULL && *search_error_message != 0)
default: /* Paranoia */
case ERROR:
- HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]);
+ HDEBUG(D_acl) debug_printf("%s: condition test error in %s\n", verbs[acl->verb], acl_name);
return ERROR;
case OK:
- HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n",
- verbs[acl->verb]);
+ HDEBUG(D_acl) debug_printf("%s: condition test succeeded in %s\n",
+ verbs[acl->verb], acl_name);
break;
case FAIL:
- HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]);
+ HDEBUG(D_acl) debug_printf("%s: condition test failed in %s\n", verbs[acl->verb], acl_name);
break;
/* DISCARD and DROP can happen only from a nested ACL condition, and
DISCARD can happen only for an "accept" or "discard" verb. */
case DISCARD:
- HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n",
- verbs[acl->verb]);
+ HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\" in %s\n",
+ verbs[acl->verb], acl_name);
break;
case FAIL_DROP:
- HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n",
- verbs[acl->verb]);
+ HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\" in %s\n",
+ verbs[acl->verb], acl_name);
break;
}
switch(acl->verb)
{
case ACL_ACCEPT:
- if (cond == OK || cond == DISCARD) return cond;
+ if (cond == OK || cond == DISCARD)
+ {
+ HDEBUG(D_acl) debug_printf("end of %s: ACCEPT\n", acl_name);
+ return cond;
+ }
if (endpass_seen)
{
HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n");
case ACL_DEFER:
if (cond == OK)
{
+ HDEBUG(D_acl) debug_printf("end of %s: DEFER\n", acl_name);
+ if (acl_quit_check) goto badquit;
acl_temp_details = TRUE;
return DEFER;
}
break;
case ACL_DENY:
- if (cond == OK) return FAIL;
+ if (cond == OK)
+ {
+ HDEBUG(D_acl) debug_printf("end of %s: DENY\n", acl_name);
+ if (acl_quit_check) goto badquit;
+ return FAIL;
+ }
break;
case ACL_DISCARD:
- if (cond == OK || cond == DISCARD) return DISCARD;
+ if (cond == OK || cond == DISCARD)
+ {
+ HDEBUG(D_acl) debug_printf("end of %s: DISCARD\n", acl_name);
+ if (acl_quit_check) goto badquit;
+ return DISCARD;
+ }
if (endpass_seen)
{
HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n");
break;
case ACL_DROP:
- if (cond == OK) return FAIL_DROP;
+ if (cond == OK)
+ {
+ HDEBUG(D_acl) debug_printf("end of %s: DROP\n", acl_name);
+ if (acl_quit_check) goto badquit;
+ return FAIL_DROP;
+ }
break;
case ACL_REQUIRE:
- if (cond != OK) return cond;
+ if (cond != OK)
+ {
+ HDEBUG(D_acl) debug_printf("end of %s: not OK\n", acl_name);
+ if (acl_quit_check) goto badquit;
+ return cond;
+ }
break;
case ACL_WARN:
HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name);
return FAIL;
+
+badquit:
+ *log_msgptr = string_sprintf("QUIT or not-QUIT teplevel ACL may not fail "
+ "('%s' verb used incorrectly)", verbs[acl->verb]);
+ return ERROR;
+}
+
+
+
+
+/* Same args as acl_check_internal() above, but the string s is
+the name of an ACL followed optionally by up to 9 space-separated arguments.
+The name and args are separately expanded. Args go into $acl_arg globals. */
+static int
+acl_check_wargs(int where, address_item *addr, const uschar *s, int level,
+ uschar **user_msgptr, uschar **log_msgptr)
+{
+uschar * tmp;
+uschar * tmp_arg[9]; /* must match acl_arg[] */
+uschar * sav_arg[9]; /* must match acl_arg[] */
+int sav_narg;
+uschar * name;
+int i;
+int ret;
+
+if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp)))
+ goto bad;
+
+for (i = 0; i < 9; i++)
+ {
+ while (*s && isspace(*s)) s++;
+ if (!*s) break;
+ if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp)))
+ {
+ tmp = name;
+ goto bad;
+ }
+ }
+
+sav_narg = acl_narg;
+acl_narg = i;
+for (i = 0; i < acl_narg; i++)
+ {
+ sav_arg[i] = acl_arg[i];
+ acl_arg[i] = tmp_arg[i];
+ }
+while (i < 9)
+ {
+ sav_arg[i] = acl_arg[i];
+ acl_arg[i++] = NULL;
+ }
+
+ret = acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr);
+
+acl_narg = sav_narg;
+for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i];
+return ret;
+
+bad:
+if (expand_string_forcedfail) return ERROR;
+*log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s",
+ tmp, expand_string_message);
+return search_find_defer?DEFER:ERROR;
}
+
/*************************************************
* Check access using an ACL *
*************************************************/
+/* Alternate interface for ACL, used by expansions */
+int
+acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr)
+{
+address_item adb;
+address_item *addr = NULL;
+
+*user_msgptr = *log_msgptr = NULL;
+sender_verified_failed = NULL;
+ratelimiters_cmd = NULL;
+log_reject_target = LOG_MAIN|LOG_REJECT;
+
+if (where == ACL_WHERE_RCPT)
+ {
+ adb = address_defaults;
+ addr = &adb;
+ addr->address = expand_string(US"$local_part@$domain");
+ addr->domain = deliver_domain;
+ addr->local_part = deliver_localpart;
+ addr->cc_local_part = deliver_localpart;
+ addr->lc_local_part = deliver_localpart;
+ }
+
+return acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr);
+}
+
+
+
/* This is the external interface for ACL checks. It sets up an address and the
expansions for $domain and $local_part when called after RCPT, then calls
acl_check_internal() to do the actual work.
DEFER can't tell at the moment
ERROR disaster
*/
+int acl_where = ACL_WHERE_UNKNOWN;
int
acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr,
ratelimiters_cmd = NULL;
log_reject_target = LOG_MAIN|LOG_REJECT;
+#ifndef DISABLE_PRDR
+if (where == ACL_WHERE_RCPT || where == ACL_WHERE_PRDR)
+#else
if (where == ACL_WHERE_RCPT)
+#endif
{
adb = address_defaults;
addr = &adb;
*log_msgptr = US"defer in percent_hack_domains check";
return DEFER;
}
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ if ((addr->prop.utf8_msg = message_smtputf8))
+ {
+ addr->prop.utf8_downcvt = message_utf8_downconvert == 1;
+ addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1;
+ }
+#endif
deliver_domain = addr->domain;
deliver_localpart = addr->local_part;
}
+acl_where = where;
rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr);
+acl_where = ACL_WHERE_UNKNOWN;
+
+/* Cutthrough - if requested,
+and WHERE_RCPT and not yet opened conn as result of recipient-verify,
+and rcpt acl returned accept,
+and first recipient (cancel on any subsequents)
+open one now and run it up to RCPT acceptance.
+A failed verify should cancel cutthrough request.
+
+Initial implementation: dual-write to spool.
+Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection.
+
+Cease cutthrough copy on rxd final dot; do not send one.
+
+On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness).
+
+On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or
+perm-rejected, reflect that to the original sender - and dump the spooled copy.
+If temp-reject, close the conn (and keep the spooled copy).
+If conn-failure, no action (and keep the spooled copy).
+*/
+switch (where)
+{
+case ACL_WHERE_RCPT:
+#ifndef DISABLE_PRDR
+case ACL_WHERE_PRDR:
+#endif
+ if (rc == OK && cutthrough.delivery && rcpt_count > cutthrough.nrcpt)
+ open_cutthrough_connection(addr);
+ break;
+
+case ACL_WHERE_PREDATA:
+ if( rc == OK )
+ cutthrough_predata();
+ else
+ cancel_cutthrough_connection("predata acl not ok");
+ break;
+
+case ACL_WHERE_QUIT:
+case ACL_WHERE_NOTQUIT:
+ cancel_cutthrough_connection("quit or notquit");
+ break;
+
+default:
+ break;
+}
deliver_domain = deliver_localpart = deliver_address_data =
sender_address_data = NULL;
}
-
/*************************************************
* Create ACL variable *
*************************************************/
fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value);
}
+/* vi: aw ai sw=2
+*/
/* End of acl.c */
git://git.exim.org / users / jgh / exim.git / blobdiff