network/opensmtpd: Fix more security issues.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

4 files changed, 110 insertions, 2 deletions

diff --git a/network/opensmtpd/openbsd64-020-smtpd.patch b/network/opensmtpd/openbsd64-020-smtpd.patch
index a1aa51607a272..8ce7178da8b17 100644
--- a/network/opensmtpd/openbsd64-020-smtpd.patch
+++ b/network/opensmtpd/openbsd64-020-smtpd.patch
@@ -1,3 +1,7 @@
+OpenBSD 6.4 errata 020, August 2, 2019
+
+smtpd can crash on excessively large input, causing a denial of service.
+
 --- a/smtpd/smtp_session.c	3 Sep 2018 19:01:29 -0000	1.337
 +++ b/smtpd/smtp_session.c	1 Aug 2019 21:18:53 -0000
 @@ -1904,15 +1904,21 @@ smtp_reply(struct smtp_session *s, char 
diff --git a/network/opensmtpd/openbsd65-029-smptd-tls.patch b/network/opensmtpd/openbsd65-029-smptd-tls.patch
new file mode 100644
index 0000000000000..a2727decf8f7e
--- /dev/null
+++ b/network/opensmtpd/openbsd65-029-smptd-tls.patch
@@ -0,0 +1,52 @@
+OpenBSD 6.5 errata 029, January 30, 2020:
+
+smtpd can crash on opportunistic TLS downgrade, causing a denial of service.
+
+--- usr.sbin/smtpd/mta_session.c	23 Dec 2018 16:37:53 -0000	1.115
++++ usr.sbin/smtpd/mta_session.c	20 Jan 2020 10:36:58 -0000
+@@ -1292,40 +1292,20 @@ mta_io(struct io *io, int evt, void *arg
+ 		break;
+ 
+ 	case IO_ERROR:
++	case IO_TLSERROR:
+ 		log_debug("debug: mta: %p: IO error: %s", s, io_error(io));
+-		if (!s->ready) {
+-			mta_error(s, "IO Error: %s", io_error(io));
+-			mta_connect(s);
+-			break;
+-		}
+-		else if (!(s->flags & (MTA_FORCE_TLS|MTA_FORCE_SMTPS|MTA_FORCE_ANYSSL))) {
+-			/* error in non-strict SSL negotiation, downgrade to plain */
+-			if (s->flags & MTA_TLS) {
+-				log_info("smtp-out: Error on session %016"PRIx64
+-				    ": opportunistic TLS failed, "
+-				    "downgrading to plain", s->id);
+-				s->flags &= ~MTA_TLS;
+-				s->flags |= MTA_DOWNGRADE_PLAIN;
+-				mta_connect(s);
+-				break;
+-			}
+-		}
+-		mta_error(s, "IO Error: %s", io_error(io));
+-		mta_free(s);
+-		break;
+ 
+-	case IO_TLSERROR:
+-		log_debug("debug: mta: %p: TLS IO error: %s", s, io_error(io));
+-		if (!(s->flags & (MTA_FORCE_TLS|MTA_FORCE_SMTPS|MTA_FORCE_ANYSSL))) {
++		if (s->state == MTA_STARTTLS && s->use_smtp_tls) {
+ 			/* error in non-strict SSL negotiation, downgrade to plain */
+-			log_info("smtp-out: TLS Error on session %016"PRIx64
+-			    ": TLS failed, "
++			log_info("smtp-out: Error on session %016"PRIx64
++			    ": opportunistic TLS failed, "
+ 			    "downgrading to plain", s->id);
+ 			s->flags &= ~MTA_TLS;
+ 			s->flags |= MTA_DOWNGRADE_PLAIN;
+ 			mta_connect(s);
+ 			break;
+ 		}
++
+ 		mta_error(s, "IO Error: %s", io_error(io));
+ 		mta_free(s);
+ 		break;
diff --git a/network/opensmtpd/openbsd66-019-smtpd-exec.patch b/network/opensmtpd/openbsd66-019-smtpd-exec.patch
new file mode 100644
index 0000000000000..93ce19dcb1704
--- /dev/null
+++ b/network/opensmtpd/openbsd66-019-smtpd-exec.patch
@@ -0,0 +1,46 @@
+OpenBSD 6.6 errata 019, January 30, 2020:
+
+An incorrect check allows an attacker to trick mbox delivery into executing
+arbitrary commands as root and lmtp delivery into executing arbitrary commands
+as an unprivileged user.
+
+--- usr.sbin/smtpd/smtp_session.c	4 Oct 2019 08:34:29 -0000	1.415
++++ usr.sbin/smtpd/smtp_session.c	26 Jan 2020 05:56:37 -0000
+@@ -2012,24 +2012,22 @@ smtp_mailaddr(struct mailaddr *maddr, ch
+ 		memmove(maddr->user, p, strlen(p) + 1);
+ 	}
+ 
+-	if (!valid_localpart(maddr->user) ||
+-	    !valid_domainpart(maddr->domain)) {
+-		/* accept empty return-path in MAIL FROM, required for bounces */
+-		if (mailfrom && maddr->user[0] == '\0' && maddr->domain[0] == '\0')
+-			return (1);
++	/* accept empty return-path in MAIL FROM, required for bounces */
++	if (mailfrom && maddr->user[0] == '\0' && maddr->domain[0] == '\0')
++		return (1);
+ 
+-		/* no user-part, reject */
+-		if (maddr->user[0] == '\0')
+-			return (0);
+-
+-		/* no domain, local user */
+-		if (maddr->domain[0] == '\0') {
+-			(void)strlcpy(maddr->domain, domain,
+-			    sizeof(maddr->domain));
+-			return (1);
+-		}
++	/* no or invalid user-part, reject */
++	if (maddr->user[0] == '\0' || !valid_localpart(maddr->user))
+ 		return (0);
++
++	/* no domain part, local user */
++	if (maddr->domain[0] == '\0') {
++		(void)strlcpy(maddr->domain, domain,
++			sizeof(maddr->domain));
+ 	}
++
++	if (!valid_domainpart(maddr->domain))
++		return (0);
+ 
+ 	return (1);
+ }
diff --git a/network/opensmtpd/opensmtpd.SlackBuild b/network/opensmtpd/opensmtpd.SlackBuild
index d2e54fba716d8..052a1fcf03733 100644
--- a/network/opensmtpd/opensmtpd.SlackBuild
+++ b/network/opensmtpd/opensmtpd.SlackBuild
@@ -3,7 +3,7 @@
 # Slackware build script for opensmtpd
 
 # Copyright 2013-2014  Robby Workman, Northport, Alabama, USA
-# Copyright 2015-2018  Richard Narron, California, USA
+# Copyright 2015-2020  Richard Narron, California, USA
 # All rights reserved.
 #
 # Redistribution and use of this script, with or without modification, is
@@ -25,7 +25,7 @@
 
 PRGNAM=opensmtpd
 VERSION=${VERSION:-6.0.3p1}
-BUILD=${BUILD:-4}
+BUILD=${BUILD:-5}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -95,6 +95,12 @@ find -L . \
 # fix reply buffer overflow
 cat $CWD/openbsd64-020-smtpd.patch | patch -p1
 
+# fix tls downgrade
+cat $CWD/openbsd65-029-smptd-tls.patch | patch -p1
+
+# fix exec
+cat $CWD/openbsd66-019-smtpd-exec.patch | patch -p1
+
 # check null from crypt function
 cat $CWD/fix-crash-on-authentication.patch | patch -p1