From d0e4bb183c038fe38ee249c1bd096f49120e908a Mon Sep 17 00:00:00 2001 From: Jeremy Harris Date: Fri, 26 Jan 2024 21:18:01 +0000 Subject: [PATCH] Fix smtp transport response to close after all rcpt fates determined. Bug 3059 --- doc/doc-txt/ChangeLog | 12 +++++ src/src/transports/smtp.c | 96 ++++++++++++++++++++---------------- test/README | 2 +- test/confs/0900 | 8 +++ test/log/0905 | 45 ++++++++++------- test/rejectlog/0905 | 3 ++ test/scripts/0000-Basic/0905 | 51 ++++++++++++++++--- test/stdout/0905 | 14 +++--- 8 files changed, 155 insertions(+), 76 deletions(-) create mode 100644 test/rejectlog/0905 diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 48cc62910..4287e41e5 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -102,6 +102,18 @@ JH/20 Bug 3047: A recent (somewhere between 10.34 and 10.42) version of the The same issue arises with the ACL regex condition, which is applied to every line of a received message. +JH/21 Bug 3059: Fix crash in smtp transport. When running for a message for + which all recipients had been handled (itself an issue) a null-pointer + deref was done on trying to write a retry record. Fix that by counting + the outstanding recipients before trying to transmit the message. + The situation arose for a second MX try within a transport run, when the + first had perm-rejected a recipient (the only one for the connection, in + the case seen) during pipelining, and then closed the TCP connection. + The transport classified that as an I/O error, leaving the message + outstanding but having marked up the recipient as dealt-with. It then + tried another MX because of the I/O error. Fix this by converting the + message-level status to ok if there was a close but all recipients were + dealt with. Thanks to Wolfgand Breyha for debug runs. Exim version 4.97 ----------------- diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c index 817d729a7..c205145a7 100644 --- a/src/src/transports/smtp.c +++ b/src/src/transports/smtp.c @@ -4518,7 +4518,26 @@ if (!sx->ok) break; case ERRNO_SMTPCLOSED: - message_error = Ustrncmp(smtp_command,"end ",4) == 0; + /* If the peer closed the TCP connection after end-of-data, but before + we could send QUIT, do TLS close, etc - call it a message error. + Otherwise, if all the recipients have been dealt with, call a close no + error at all; each address_item should have a suitable result already + (2xx: PENDING_OK, 4xx: DEFER, 5xx: FAIL) */ + + if (!(message_error = Ustrncmp(smtp_command,"end ",4) == 0)) + { + address_item * addr; + for (addr = sx->addrlist; addr; addr = addr->next) + if (addr->transport_return == PENDING_DEFER) + break; + if (!addr) /* all rcpts fates determined */ + { + log_write(0, LOG_MAIN, "peer close after all rcpt responses;" + " converting i/o-error to no-error"); + sx->ok = TRUE; + goto happy; + } + } break; #ifndef DISABLE_DKIM @@ -4542,7 +4561,8 @@ if (!sx->ok) break; } - /* Handle the cases that are treated as message errors. These are: + /* Handle the cases that are treated as message errors (as opposed to + host-errors). These are: (a) negative response or timeout after MAIL (b) negative response after DATA @@ -4646,6 +4666,8 @@ connection to a new process. However, not all servers can handle this (Exim can), so we do not pass such a connection on if the host matches hosts_nopass_tls. */ +happy: + DEBUG(D_transport) debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit, @@ -5063,16 +5085,16 @@ Returns: the first address for this delivery */ static address_item * -prepare_addresses(address_item *addrlist, host_item *host) +prepare_addresses(address_item * addrlist, host_item * host) { -address_item *first_addr = NULL; +address_item * first_addr = NULL; for (address_item * addr = addrlist; addr; addr = addr->next) if (addr->transport_return == DEFER) { if (!first_addr) first_addr = addr; addr->transport_return = PENDING_DEFER; addr->basic_errno = 0; - addr->more_errno = (host->mx >= 0)? 'M' : 'A'; + addr->more_errno = host->mx >= 0 ? 'M' : 'A'; addr->message = NULL; #ifndef DISABLE_TLS addr->cipher = NULL; @@ -5104,24 +5126,17 @@ FALSE. */ BOOL smtp_transport_entry( - transport_instance *tblock, /* data for this instantiation */ - address_item *addrlist) /* addresses we are working on */ + transport_instance * tblock, /* data for this instantiation */ + address_item * addrlist) /* addresses we are working on */ { int defport; -int hosts_defer = 0; -int hosts_fail = 0; -int hosts_looked_up = 0; -int hosts_retry = 0; -int hosts_serial = 0; -int hosts_total = 0; -int total_hosts_tried = 0; +int hosts_defer = 0, hosts_fail = 0, hosts_looked_up = 0; +int hosts_retry = 0, hosts_serial = 0, hosts_total = 0, total_hosts_tried = 0; BOOL expired = TRUE; -uschar *expanded_hosts = NULL; -uschar *pistring; -uschar *tid = string_sprintf("%s transport", tblock->name); -smtp_transport_options_block *ob = SOB tblock->options_block; -host_item *hostlist = addrlist->host_list; -host_item *host = NULL; +uschar * expanded_hosts = NULL, * pistring; +uschar * tid = string_sprintf("%s transport", tblock->name); +smtp_transport_options_block * ob = SOB tblock->options_block; +host_item * hostlist = addrlist->host_list, * host = NULL; DEBUG(D_transport) { @@ -5161,7 +5176,7 @@ database if the delivery fails temporarily or if we are running with queue_smtp or a 2-stage queue run. This gets unset for certain kinds of error, typically those that are specific to the message. */ -update_waiting = TRUE; +update_waiting = TRUE; /* If a host list is not defined for the addresses - they must all have the same one in order to be passed to a single transport - or if the transport has @@ -5349,16 +5364,12 @@ retry_non_continued: && total_hosts_tried < ob->hosts_max_try_hardlimit; host = nexthost) { - int rc; - int host_af; - BOOL host_is_expired = FALSE; - BOOL message_defer = FALSE; - BOOL some_deferred = FALSE; - address_item *first_addr = NULL; - uschar *interface = NULL; - uschar *retry_host_key = NULL; - uschar *retry_message_key = NULL; - uschar *serialize_key = NULL; + int rc, host_af; + BOOL host_is_expired = FALSE, message_defer = FALSE, some_deferred = FALSE; + address_item * first_addr = NULL; + uschar * interface = NULL; + uschar * retry_host_key = NULL, * retry_message_key = NULL; + uschar * serialize_key = NULL; /* Deal slightly better with a possible Linux kernel bug that results in intermittent TFO-conn fails deep into the TCP flow. Bug 2907 tracks. @@ -5665,7 +5676,14 @@ retry_non_continued: out the result of previous attempts, and finding the first address that is still to be delivered. */ - first_addr = prepare_addresses(addrlist, host); + if (!(first_addr = prepare_addresses(addrlist, host))) + { + /* Obscure situation; at least one case (bug 3059, fixed) where + a previous host try returned DEFER, but having moved all + recipients away from DEFER (the waiting-to-be-done state). */ + DEBUG(D_transport) debug_printf("no pending recipients\n"); + goto END_TRANSPORT; + } DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", message_id, host->name, host->address, addrlist->address, @@ -5717,7 +5735,7 @@ retry_non_continued: { host_item * thost; /* Make a copy of the host if it is local to this invocation - of the transport. */ + of the transport. */ if (expanded_hosts) { @@ -5911,20 +5929,14 @@ retry_non_continued: if (rc == OK) for (address_item * addr = addrlist; addr; addr = addr->next) if (addr->transport_return == DEFER) - { - some_deferred = TRUE; - break; - } + { some_deferred = TRUE; break; } /* If no addresses deferred or the result was ERROR, return. We do this for ERROR because a failing filter set-up or add_headers expansion is likely to fail for any host we try. */ if (rc == ERROR || (rc == OK && !some_deferred)) - { - DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); - return TRUE; /* Each address has its status */ - } + goto END_TRANSPORT; /* If the result was DEFER or some individual addresses deferred, let the loop run to try other hosts with the deferred addresses, except for the @@ -5944,7 +5956,7 @@ retry_non_continued: if ((rc == DEFER || some_deferred) && nexthost) { BOOL timedout; - retry_config *retry = retry_find_config(host->name, NULL, 0, 0); + retry_config * retry = retry_find_config(host->name, NULL, 0, 0); if (retry && retry->rules) { diff --git a/test/README b/test/README index c0bfa04f1..67df47453 100644 --- a/test/README +++ b/test/README @@ -1155,7 +1155,7 @@ are of the following kinds: before proceeding. (3) A line containing "*data" and a number specifies that the client is - expected to send that many byte; the server discards them + expected to send that many bytes; the server discards them (4) A line containing "*eof" specifies that the client is expected to close the connection at this point. diff --git a/test/confs/0900 b/test/confs/0900 index 219751ec1..80c0211a9 100644 --- a/test/confs/0900 +++ b/test/confs/0900 @@ -57,6 +57,10 @@ ALLOW begin acl check_recipient: +.ifdef RETRY2 + drop condition = ${if eq {SERVER}{server}} + message = 550 we really do not like you +.endif accept hosts = : accept domains = +local_domains deny message = relay not permitted @@ -108,7 +112,11 @@ local_delivery: remote_smtp: driver = smtp +.ifdef RETRY2 + hosts = 127.0.0.1 : HOSTIPV4 +.else hosts = 127.0.0.1 +.endif port = PORT_S hosts_try_fastopen = : .ifdef _HAVE_TLS diff --git a/test/log/0905 b/test/log/0905 index 5f0c49bfa..d53fe9dbf 100644 --- a/test/log/0905 +++ b/test/log/0905 @@ -1,24 +1,33 @@ -2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 <= sender@source.dom U=root Ci=p1234 P=local-bsmtp S=sss for p@test.ex -2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 => p@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1] K C="250 OK bdat" +2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 <= sender@source.dom U=root Ci=p1235 P=local-bsmtp S=sss for a@test.ex +2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 => a@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1] K C="250 OK bdat" 2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 Completed -2017-07-30 18:51:05.712 10HmaY-000000005vi-0000 <= sender@source.dom U=root Ci=p1235 P=local-bsmtp S=sss for r@test.ex -2017-07-30 18:51:05.712 10HmaY-000000005vi-0000 => r@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1] K C="250 OK bdat" +2017-07-30 18:51:05.712 10HmaY-000000005vi-0000 <= sender@source.dom U=root Ci=p1236 P=local-bsmtp S=sss for c@test.ex +2017-07-30 18:51:05.712 10HmaY-000000005vi-0000 => c@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1] K C="250 OK bdat" 2017-07-30 18:51:05.712 10HmaY-000000005vi-0000 Completed -2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 <= sender@source.dom U=root Ci=p1236 P=local-bsmtp S=sss for s@test.ex -2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 ** s@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 550 unacceptable mail-from -2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 s@test.ex: error ignored +2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 <= sender@source.dom U=root Ci=p1237 P=local-bsmtp S=sss for d@test.ex +2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 ** d@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 550 unacceptable mail-from +2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 d@test.ex: error ignored 2017-07-30 18:51:05.712 10HmaZ-000000005vi-0000 Completed -2017-07-30 18:51:05.712 10HmbA-000000005vi-0000 <= sender@source.dom U=root Ci=p1237 P=local-bsmtp S=sss for s1@test.ex +2017-07-30 18:51:05.712 10HmbA-000000005vi-0000 <= sender@source.dom U=root Ci=p1238 P=local-bsmtp S=sss for c1@test.ex 2017-07-30 18:51:05.712 10HmbA-000000005vi-0000 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 450 greylisted mail-from -2017-07-30 18:51:05.712 10HmbA-000000005vi-0000 == s1@test.ex R=to_server T=remote_smtp defer (-45) H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 450 greylisted mail-from -2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 <= sender@source.dom U=root Ci=p1238 P=local-bsmtp S=sss for t@test.ex -2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 ** t@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:: 550 no such recipient -2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 t@test.ex: error ignored +2017-07-30 18:51:05.712 10HmbA-000000005vi-0000 == c1@test.ex R=to_server T=remote_smtp defer (-45) H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 450 greylisted mail-from +2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 <= sender@source.dom U=root Ci=p1239 P=local-bsmtp S=sss for e@test.ex +2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 ** e@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:: 550 no such recipient +2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 e@test.ex: error ignored 2017-07-30 18:51:05.712 10HmbB-000000005vi-0000 Completed -2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 <= sender@source.dom U=root Ci=p1239 P=local-bsmtp S=sss for u@test.ex -2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 ** u@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 500 oops bdat -2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 u@test.ex: error ignored +2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 <= sender@source.dom U=root Ci=p1240 P=local-bsmtp S=sss for f1@test.ex +2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 peer close after all rcpt responses; converting i/o-error to no-error +2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 ** f1@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1] X=TLS1.x:ke-RSA-AES256-SHAnnn:xxx CV=yes: SMTP error from remote mail server after RCPT TO:: 550 we really do not like you +2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 f1@test.ex: error ignored 2017-07-30 18:51:05.712 10HmbC-000000005vi-0000 Completed -2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 <= sender@source.dom U=root Ci=p1240 P=local-bsmtp S=sss for v@test.ex -2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 400 not right now bdat -2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 == v@test.ex R=to_server T=remote_smtp defer (-46) H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 400 not right now bdat +2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 <= sender@source.dom U=root Ci=p1241 P=local-bsmtp S=sss for g@test.ex +2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 ** g@test.ex R=to_server T=remote_smtp H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 500 oops bdat +2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 g@test.ex: error ignored +2017-07-30 18:51:05.712 10HmbD-000000005vi-0000 Completed +2017-07-30 18:51:05.712 10HmbE-000000005vi-0000 <= sender@source.dom U=root Ci=p1242 P=local-bsmtp S=sss for h@test.ex +2017-07-30 18:51:05.712 10HmbE-000000005vi-0000 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 400 not right now bdat +2017-07-30 18:51:05.712 10HmbE-000000005vi-0000 == h@test.ex R=to_server T=remote_smtp defer (-46) H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after pipelined end of data: 400 not right now bdat + +******** SERVER ******** +2017-07-30 18:51:05.712 exim x.yz daemon started: pid=p1243, no queue runs, listening for SMTP on port PORT_S +2017-07-30 18:51:05.712 H=localhost (testhost.test.ex) [127.0.0.1] Ci=p1234 X=TLS1.x:ke-RSA-AES256-SHAnnn:xxx CV=no F=<> rejected RCPT : 550 we really do not like you diff --git a/test/rejectlog/0905 b/test/rejectlog/0905 new file mode 100644 index 000000000..d1aa48b11 --- /dev/null +++ b/test/rejectlog/0905 @@ -0,0 +1,3 @@ + +******** SERVER ******** +2017-07-30 18:51:05.712 H=localhost (testhost.test.ex) [127.0.0.1] Ci=p1234 X=TLS1.x:ke-RSA-AES256-SHAnnn:xxx CV=no F=<> rejected RCPT : 550 we really do not like you diff --git a/test/scripts/0000-Basic/0905 b/test/scripts/0000-Basic/0905 index 48f9574db..390b19c2e 100644 --- a/test/scripts/0000-Basic/0905 +++ b/test/scripts/0000-Basic/0905 @@ -23,7 +23,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo @@ -53,7 +53,7 @@ QUIT #sudo exim -odf -bS #EHLO test #MAIL FROM: -#RCPT TO: +#RCPT TO: #DATA #Subject: foo # @@ -84,7 +84,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo @@ -115,7 +115,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo @@ -144,7 +144,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo @@ -173,7 +173,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo @@ -182,6 +182,41 @@ data QUIT **** # +# server rejects RCPT cmd, and immediately drops the TCP conn +sudo rm DIR/spool/db/retry +exim -bd -DSERVER=server -DRETRY2 -DSRV=tls -oX PORT_S +**** +sudo exim -DRETRY2 -odf -bS +EHLO test +MAIL FROM: +RCPT TO: +DATA +Subject: foo +BigHeader_500: 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 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+237,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo @@ -231,7 +266,7 @@ QUIT sudo exim -odf -bS EHLO test MAIL FROM: -RCPT TO: +RCPT TO: DATA Subject: foo diff --git a/test/stdout/0905 b/test/stdout/0905 index 09c997ebf..7e687e780 100644 --- a/test/stdout/0905 +++ b/test/stdout/0905 @@ -8,7 +8,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 345 LAST 250 OK mail 250 OK rcpt @@ -25,7 +25,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 345 LAST 250 OK mail 250 OK rcpt @@ -41,7 +41,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 345 LAST 550 unacceptable mail-from 550 rcpt ungood lacking mail-from @@ -57,7 +57,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 346 LAST 450 greylisted mail-from 550 rcpt ungood lacking mail-from @@ -73,7 +73,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 345 LAST 250 OK mail 550 no such recipient @@ -89,7 +89,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 345 LAST 250 OK mail 250 OK rcpt @@ -105,7 +105,7 @@ EHLO testhost.test.ex 250-PIPELINING 250 CHUNKING MAIL FROM:<> -RCPT TO: +RCPT TO: BDAT 345 LAST 250 OK mail 250 OK rcpt -- 2.30.2