X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=src%2Fsrc%2Facl.c;h=e3efb7ed873c627b89474a8940ff3dab13824e5b;hb=27f9999e2828002705cabd10ef62ce86378287e3;hp=5101267c217dc6fdad67c55b5705c0b6e00b662a;hpb=fd8c9db9ffc56400f46b2f5168ae4ee36adc50a5;p=exim.git diff --git a/src/src/acl.c b/src/src/acl.c index 5101267c2..e3efb7ed8 100644 --- a/src/src/acl.c +++ b/src/src/acl.c @@ -21,8 +21,13 @@ enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, /* 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 @@ -66,6 +71,9 @@ enum { ACLC_ACL, #ifndef DISABLE_DKIM ACLC_DKIM_SIGNER, ACLC_DKIM_STATUS, +#endif +#ifdef EXPERIMENTAL_DMARC + ACLC_DMARC_STATUS, #endif ACLC_DNSLISTS, ACLC_DOMAINS, @@ -88,6 +96,7 @@ enum { ACLC_ACL, #ifdef WITH_CONTENT_SCAN ACLC_REGEX, #endif + ACLC_REMOVE_HEADER, ACLC_SENDER_DOMAINS, ACLC_SENDERS, ACLC_SET, @@ -98,6 +107,7 @@ enum { ACLC_ACL, ACLC_SPF, ACLC_SPF_GUESS, #endif + ACLC_UDPSEND, ACLC_VERIFY }; /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", @@ -128,6 +138,9 @@ static uschar *conditions[] = { #ifndef DISABLE_DKIM US"dkim_signers", US"dkim_status", +#endif +#ifdef EXPERIMENTAL_DMARC + US"dmarc_status", #endif US"dnslists", US"domains", @@ -150,6 +163,7 @@ static uschar *conditions[] = { #ifdef WITH_CONTENT_SCAN US"regex", #endif + US"remove_header", US"sender_domains", US"senders", US"set", #ifdef WITH_CONTENT_SCAN US"spam", @@ -158,6 +172,7 @@ static uschar *conditions[] = { US"spf", US"spf_guess", #endif + US"udpsend", US"verify" }; @@ -173,6 +188,10 @@ enum { #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, @@ -209,6 +228,10 @@ static uschar *controls[] = { #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", @@ -258,6 +281,9 @@ static uschar cond_expand_at_top[] = { #ifndef DISABLE_DKIM TRUE, /* dkim_signers */ TRUE, /* dkim_status */ +#endif +#ifdef EXPERIMENTAL_DMARC + TRUE, /* dmarc_status */ #endif TRUE, /* dnslists */ FALSE, /* domains */ @@ -280,6 +306,7 @@ static uschar cond_expand_at_top[] = { #ifdef WITH_CONTENT_SCAN TRUE, /* regex */ #endif + TRUE, /* remove_header */ FALSE, /* sender_domains */ FALSE, /* senders */ TRUE, /* set */ @@ -290,6 +317,7 @@ static uschar cond_expand_at_top[] = { TRUE, /* spf */ TRUE, /* spf_guess */ #endif + TRUE, /* udpsend */ TRUE /* verify */ }; @@ -318,6 +346,9 @@ static uschar cond_modifiers[] = { #ifndef DISABLE_DKIM FALSE, /* dkim_signers */ FALSE, /* dkim_status */ +#endif +#ifdef EXPERIMENTAL_DMARC + FALSE, /* dmarc_status */ #endif FALSE, /* dnslists */ FALSE, /* domains */ @@ -340,6 +371,7 @@ static uschar cond_modifiers[] = { #ifdef WITH_CONTENT_SCAN FALSE, /* regex */ #endif + TRUE, /* remove_header */ FALSE, /* sender_domains */ FALSE, /* senders */ TRUE, /* set */ @@ -350,6 +382,7 @@ static uschar cond_modifiers[] = { FALSE, /* spf */ FALSE, /* spf_guess */ #endif + TRUE, /* udpsend */ FALSE /* verify */ }; @@ -364,6 +397,9 @@ static unsigned int cond_forbids[] = { (unsigned int) ~((1<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(uschar *hnames) +{ +if (*hnames != 0) + { + if (acl_removed_headers == NULL) + acl_removed_headers = hnames; + else + acl_removed_headers = string_sprintf("%s : %s", acl_removed_headers, hnames); + } +} + + /************************************************* * Handle warnings * @@ -2650,6 +2822,106 @@ return rc; +/************************************************* +* 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(uschar *arg, uschar **log_msgptr) +{ +int sep = 0; +uschar *hostname; +uschar *portstr; +uschar *portend; +host_item *h; +int portnum; +int host_af; +int len; +int r, s; + +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); + +host_af = (Ustrchr(h->address, ':') == NULL)? AF_INET:AF_INET6; +r = s = ip_socket(SOCK_DGRAM, host_af); +if (r < 0) goto defer; +r = ip_connect(s, host_af, h->address, portnum, 1); +if (r < 0) goto defer; +len = Ustrlen(arg); +r = send(s, arg, len, MSG_NOSIGNAL); +if (r < 0) goto defer; +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", strerror(errno)); +return DEFER; +} + + + /************************************************* * Handle conditions/modifiers on an ACL item * *************************************************/ @@ -2785,33 +3057,7 @@ for (; cb != NULL; cb = cb->next) "discard" verb. */ case ACLC_ACL: - { - uschar * cp = arg; - uschar * tmp; - uschar * name; - - if (!(tmp = string_dequote(&cp)) || !(name = expand_string(tmp))) - { - if (expand_string_forcedfail) continue; - *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", - tmp, expand_string_message); - return search_find_defer? DEFER : ERROR; - } - - for (acl_narg = 0; acl_narg < sizeof(acl_arg)/sizeof(*acl_arg); acl_narg++) - { - while (*cp && isspace(*cp)) cp++; - if (!*cp) break; - if (!(tmp = string_dequote(&cp)) || !(acl_arg[acl_narg] = expand_string(tmp))) - { - if (expand_string_forcedfail) continue; - *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", - arg, expand_string_message); - return search_find_defer? DEFER : ERROR; - } - } - - rc = acl_check_internal(where, addr, name, level+1, user_msgptr, log_msgptr); + 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 " @@ -2819,7 +3065,6 @@ for (; cb != NULL; cb = cb->next) verbs[verb]); return ERROR; } - } break; case ACLC_AUTHENTICATED: @@ -2884,6 +3129,21 @@ for (; cb != NULL; cb = cb->next) #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 @@ -3177,6 +3437,18 @@ for (; cb != NULL; cb = cb->next) break; #endif + #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_DNSLISTS: rc = verify_check_dnsbl(&arg); break; @@ -3321,6 +3593,10 @@ for (; cb != NULL; cb = cb->next) break; #endif + case ACLC_REMOVE_HEADER: + setup_remove_header(arg); + break; + case ACLC_SENDER_DOMAINS: { uschar *sdomain; @@ -3376,6 +3652,10 @@ for (; cb != NULL; cb = cb->next) 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 @@ -3895,28 +4175,50 @@ return FAIL; /* 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 $acl_arg globals. */ -int -acl_check_args(int where, address_item *addr, uschar *s, int level, +static int +acl_check_wargs(int where, address_item *addr, uschar *s, int level, uschar **user_msgptr, uschar **log_msgptr) { uschar * tmp; +uschar * tmp_arg[9]; /* must match acl_arg[] */ +uschar * sav_arg[9]; /* must match acl_arg[] */ +int sav_narg; uschar * name; +int i; +int ret; if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) goto bad; -for (acl_narg = 0; acl_narg < sizeof(acl_arg)/sizeof(*acl_arg); acl_narg++) +for (i = 0; i < 9; i++) { while (*s && isspace(*s)) s++; if (!*s) break; - if (!(tmp = string_dequote(&s)) || !(acl_arg[acl_narg] = expand_string(tmp))) + if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) { tmp = name; goto bad; } } -return acl_check_internal(where, addr, name, level+1, user_msgptr, log_msgptr); +sav_narg = acl_narg; +acl_narg = i; +for (i = 0; i < acl_narg; i++) + { + sav_arg[i] = acl_arg[i]; + acl_arg[i] = tmp_arg[i]; + } +while (i < 9) + { + sav_arg[i] = acl_arg[i]; + acl_arg[i++] = NULL; + } + +ret = acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr); + +acl_narg = sav_narg; +for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; +return ret; bad: if (expand_string_forcedfail) return ERROR; @@ -3931,6 +4233,34 @@ return search_find_defer?DEFER:ERROR; * Check access using an ACL * *************************************************/ +/* Alternate interface for ACL, used by expansions */ +int +acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) +{ +address_item adb; +address_item *addr = NULL; + +*user_msgptr = *log_msgptr = NULL; +sender_verified_failed = NULL; +ratelimiters_cmd = NULL; +log_reject_target = LOG_MAIN|LOG_REJECT; + +if (where == ACL_WHERE_RCPT) + { + adb = address_defaults; + addr = &adb; + addr->address = expand_string(US"$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. @@ -3949,6 +4279,7 @@ Returns: OK access is granted by an ACCEPT verb 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, @@ -3963,7 +4294,11 @@ sender_verified_failed = NULL; ratelimiters_cmd = NULL; log_reject_target = LOG_MAIN|LOG_REJECT; -if (where == ACL_WHERE_RCPT) +#ifdef EXPERIMENTAL_PRDR +if (where == ACL_WHERE_RCPT || where == ACL_WHERE_PRDR ) +#else +if (where == ACL_WHERE_RCPT ) +#endif { adb = address_defaults; addr = &adb; @@ -3977,7 +4312,9 @@ if (where == ACL_WHERE_RCPT) 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, @@ -4001,6 +4338,9 @@ If conn-failure, no action (and keep the spooled copy). switch (where) { case ACL_WHERE_RCPT: +#ifdef EXPERIMENTAL_PRDR +case ACL_WHERE_PRDR: +#endif if( rcpt_count > 1 ) cancel_cutthrough_connection("more than one recipient"); else if (rc == OK && cutthrough_delivery && cutthrough_fd < 0) @@ -4060,7 +4400,6 @@ return rc; } - /************************************************* * Create ACL variable * *************************************************/