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Message #16176
[Bug 1709193] Re: Unable to use TLSv1.1 or 1.2 with OpenSSL compat layer
** No longer affects: ssmtp (Ubuntu Trusty)
** No longer affects: ssmtp (Ubuntu Xenial)
** No longer affects: ssmtp (Ubuntu Zesty)
** No longer affects: ssmtp (Ubuntu Artful)
** No longer affects: gnutls26 (Ubuntu Xenial)
** No longer affects: gnutls26 (Ubuntu Zesty)
** No longer affects: gnutls26 (Ubuntu Artful)
** No longer affects: gnutls26 (Ubuntu)
** Changed in: gnutls26 (Ubuntu Trusty)
Importance: Undecided => Medium
** Changed in: gnutls28 (Ubuntu Trusty)
Importance: Undecided => Medium
** Changed in: gnutls28 (Ubuntu Xenial)
Importance: Undecided => Medium
** Changed in: gnutls28 (Ubuntu Zesty)
Importance: Undecided => Medium
** Changed in: gnutls28 (Ubuntu Artful)
Importance: Undecided => Medium
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1709193
Title:
Unable to use TLSv1.1 or 1.2 with OpenSSL compat layer
Status in gnutls28 package in Ubuntu:
Fix Released
Status in gnutls26 source package in Trusty:
Fix Committed
Status in gnutls28 source package in Trusty:
Won't Fix
Status in gnutls28 source package in Xenial:
Fix Committed
Status in gnutls28 source package in Zesty:
Fix Released
Status in gnutls28 source package in Artful:
Fix Released
Status in gnutls28 package in Debian:
Fix Released
Bug description:
[Impact]
Applications using GnuTLS OpenSSL compat layer [1] are be unable to
use modern TLS versions (1.1 and 1.2) when relying on the
SSLv23_{client,server}_method functions.
There is an industry-wide push to use modern TLS versions, see [2] and
[3] for example.
The proposed fix changes the compat layer to use GnuTLS' "NORMAL"
priority [4] instead of hard-coding which protocol versions and
ciphers to enable.
[Test Case]
1) Setup a mail submission server that uses StartTLS
2) Setup sSMTP (uses GnuTLS OpenSSL compat layer) to relay
through the mail relay using StartTLS
3) Send an email while capturing with tcpdump/tshark
4) Inspect the submission connection (TCP/587) and look for the protocol
version negotiated by the client.
Without the fix, you should see TLSv1.0. With the fix, it should be
TLSv1.2.
Please see the original issue description for more details.
[Regression Potential]
Regression risk should be low since it's a backport of a simple fix
that landed in Debian in April 2017.
[References]
1: $ apt-cache rdepends libgnutls-openssl27
libgnutls-openssl27
Reverse Depends:
libgnutls-dev
libgnutls-dev
zoneminder
yaskkserv
tf5
ssmtp
snowdrop
sngrep
slrnpull
slrn
sipsak
macopix-gtk2
gnss-sdr
gkrellm
freewheeling
boinctui
iputils-ping
2: https://lists.debian.org/debian-devel-announce/2017/08/msg00004.html
3: https://blog.pcisecuritystandards.org/migrating-from-ssl-and-early-tls
4: https://gnutls.org/manual/html_node/Priority-Strings.html
[Original issue description]
sSMTP is limited to using TLSv1.0 and the "old" ciphers that come with
it. Here's a packet capture when ssmtp connects to
smtp.sdeziel.info:587 that offers TLSv1.0 and higher:
$ tshark -ta -Vr submission.pcap | sed -n '/^Frame 14:/,/^Frame 15:/ p' | grep -E '^[[:space:]]+(Version|Cipher|Handshake Protocol)'
Version: TLS 1.0 (0x0301)
Handshake Protocol: Client Hello
Version: TLS 1.0 (0x0301)
Cipher Suites Length: 30
Cipher Suites (15 suites)
Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)
Cipher Suite: TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0041)
Cipher Suite: TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0084)
Cipher Suite: TLS_RSA_WITH_3DES_EDE_CBC_SHA (0x000a)
Cipher Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x0033)
Cipher Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x0039)
Cipher Suite: TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0045)
Cipher Suite: TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0088)
Cipher Suite: TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA (0x0016)
Cipher Suite: TLS_DHE_DSS_WITH_AES_128_CBC_SHA (0x0032)
Cipher Suite: TLS_DHE_DSS_WITH_AES_256_CBC_SHA (0x0038)
Cipher Suite: TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA (0x0044)
Cipher Suite: TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA (0x0087)
Cipher Suite: TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA (0x0013)
I would expect ssmtp to use TLSv1.2 and a recent cipher like the
openssl s_client is able to do:
$ echo | openssl s_client -connect smtp.sdeziel.info:587 -starttls smtp 2>/dev/null | grep -E '^[[:space:]]+(Protocol|Cipher)'
Protocol : TLSv1.2
Cipher : ECDHE-RSA-AES128-GCM-SHA256
Additional information:
$ lsb_release -rd
Description: Ubuntu 16.04.3 LTS
Release: 16.04
$ apt-cache policy ssmtp libgnutls-openssl27
ssmtp:
Installed: 2.64-8ubuntu1
Candidate: 2.64-8ubuntu1
Version table:
*** 2.64-8ubuntu1 500
500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
100 /var/lib/dpkg/status
libgnutls-openssl27:
Installed: 3.4.10-4ubuntu1.3
Candidate: 3.4.10-4ubuntu1.3
Version table:
*** 3.4.10-4ubuntu1.3 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
100 /var/lib/dpkg/status
3.4.10-4ubuntu1 500
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ssmtp 2.64-8ubuntu1 [modified: etc/ssmtp/revaliases]
ProcVersionSignature: Ubuntu 4.4.0-89.112-generic 4.4.76
Uname: Linux 4.4.0-89-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Mon Aug 7 18:13:33 2017
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: ssmtp
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.ssmtp.revaliases: [modified]
mtime.conffile..etc.ssmtp.revaliases: 2017-08-05T13:44:06.274302
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