From c09dbcfb71f4b9a42cbfd8a20e0be6bfa1b12488 Mon Sep 17 00:00:00 2001 From: Jeremy Harris Date: Tue, 19 Mar 2019 15:33:31 +0000 Subject: [PATCH] OpenSSL: Fix aggregation of messages. Broken-by: a5ffa9b475 --- doc/doc-txt/ChangeLog | 5 +++ src/src/tls-openssl.c | 19 ++++++++--- test/confs/2152 | 76 +++++++++++++++++++++++++++++++++++++++++++ test/log/2152 | 9 +++++ 4 files changed, 105 insertions(+), 4 deletions(-) create mode 100644 test/confs/2152 create mode 100644 test/log/2152 diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 7a0a9c6d3..2085a3b7b 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -42,6 +42,11 @@ JH/08 Add hardening against SRV & TLSA lookups the hit CNAMEs (a nonvalid JH/09 Logging: Fix initial listening-on line for multiple ports for an IP when the OS reports them interleaved with other addresses. +JH/10 OpenSSL: Fix aggregation of messages. Previously, when PIPELINING was + used both for input and for a verify callout, both encrypted, SMTP + responses being sent by the server could be lost. This resulted in + dropped connections and sometimes bounces generated by a peer sending + to this system. Exim version 4.92 diff --git a/src/src/tls-openssl.c b/src/src/tls-openssl.c index d37c78970..5a5e1464b 100644 --- a/src/src/tls-openssl.c +++ b/src/src/tls-openssl.c @@ -289,6 +289,7 @@ Server: typedef struct { SSL_CTX * ctx; SSL * ssl; + gstring * corked; } exim_openssl_client_tls_ctx; static SSL_CTX *server_ctx = NULL; @@ -2523,6 +2524,7 @@ BOOL require_ocsp = FALSE; rc = store_pool; store_pool = POOL_PERM; exim_client_ctx = store_get(sizeof(exim_openssl_client_tls_ctx)); +exim_client_ctx->corked = NULL; store_pool = rc; #ifdef SUPPORT_DANE @@ -2979,8 +2981,12 @@ tls_write(void * ct_ctx, const uschar *buff, size_t len, BOOL more) { size_t olen = len; int outbytes, error; -SSL * ssl = ct_ctx ? ((exim_openssl_client_tls_ctx *)ct_ctx)->ssl : server_ssl; -static gstring * corked = NULL; +SSL * ssl = ct_ctx + ? ((exim_openssl_client_tls_ctx *)ct_ctx)->ssl : server_ssl; +static gstring * server_corked = NULL; +gstring ** corkedp = ct_ctx + ? &((exim_openssl_client_tls_ctx *)ct_ctx)->corked : &server_corked; +gstring * corked = *corkedp; DEBUG(D_tls) debug_printf("%s(%p, %lu%s)\n", __FUNCTION__, buff, (unsigned long)len, more ? ", more" : ""); @@ -2988,7 +2994,9 @@ DEBUG(D_tls) debug_printf("%s(%p, %lu%s)\n", __FUNCTION__, /* Lacking a CORK or MSG_MORE facility (such as GnuTLS has) we copy data when "more" is notified. This hack is only ok if small amounts are involved AND only one stream does it, in one context (i.e. no store reset). Currently it is used -for the responses to the received SMTP MAIL , RCPT, DATA sequence, only. */ +for the responses to the received SMTP MAIL , RCPT, DATA sequence, only. +We support callouts done by the server process by using a separate client +context for the stashed information. */ /* + if PIPE_COMMAND, banner & ehlo-resp for smmtp-on-connect. Suspect there's a store reset there, so use POOL_PERM. */ /* + if CHUNKING, cmds EHLO,MAIL,RCPT(s),BDAT */ @@ -3007,10 +3015,13 @@ if ((more || corked)) #endif if (more) + { + *corkedp = corked; return len; + } buff = CUS corked->s; len = corked->ptr; - corked = NULL; + *corkedp = NULL; } for (int left = len; left > 0;) diff --git a/test/confs/2152 b/test/confs/2152 new file mode 100644 index 000000000..f783192bd --- /dev/null +++ b/test/confs/2152 @@ -0,0 +1,76 @@ +# Exim test configuration 2152 + +SERVER= + +.include DIR/aux-var/tls_conf_prefix + +primary_hostname = myhost.test.ex + +# ----- Main settings ----- + +acl_smtp_rcpt = chk_r + +#log_selector = +tls_peerdn + +queue_only +queue_run_in_order + +tls_advertise_hosts = * + +tls_certificate = DIR/aux-fixed/cert1 +tls_privatekey = DIR/aux-fixed/cert1 + + +# ----- ACL ----- + +begin acl + +chk_r: + accept condition = ${if = {$received_port}{PORT_D2}} + accept verify = recipient/callout + +# ----- Routers ----- + +begin routers + +client: + driver = accept + condition = ${if !eq {SERVER}{server}} + transport = send_to_server + +srvr_v: + driver = accept + verify_only + transport = send_to_server_v + + +# ----- Transports ----- + +begin transports + +send_to_server: + driver = smtp + allow_localhost + hosts = 127.0.0.1 + port = PORT_D + tls_verify_certificates = DIR/aux-fixed/cert1 + tls_verify_cert_hostnames = : + +send_to_server_v: + driver = smtp + allow_localhost + hosts = 127.0.0.1 + port = PORT_D2 + tls_verify_certificates = DIR/aux-fixed/cert1 + tls_verify_cert_hostnames = : + + +# ----- Retry ----- + + +begin retry + +* * F,5d,10s + + +# End diff --git a/test/log/2152 b/test/log/2152 new file mode 100644 index 000000000..6796211a5 --- /dev/null +++ b/test/log/2152 @@ -0,0 +1,9 @@ +1999-03-02 09:44:33 10HmaX-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss +1999-03-02 09:44:33 Start queue run: pid=pppp -qf +1999-03-02 09:44:33 10HmaX-0005vi-00 => a@test.ex R=client T=send_to_server H=127.0.0.1 [127.0.0.1] X=TLS1.x:ke-RSA-AES256-SHAnnn:xxx CV=yes C="250 OK id=10HmaY-0005vi-00" +1999-03-02 09:44:33 10HmaX-0005vi-00 Completed +1999-03-02 09:44:33 End queue run: pid=pppp -qf + +******** SERVER ******** +1999-03-02 09:44:33 exim x.yz daemon started: pid=pppp, no queue runs, listening for SMTP on port PORT_D port PORT_D2 +1999-03-02 09:44:33 10HmaY-0005vi-00 <= CALLER@myhost.test.ex H=localhost (myhost.test.ex) [127.0.0.1] P=esmtps X=TLS1.x:ke-RSA-AES256-SHAnnn:xxx CV=no S=sss id=E10HmaX-0005vi-00@myhost.test.ex -- 2.30.2