** Changed in: haproxy (Ubuntu Bionic)
Assignee: Ubuntu Security Team (ubuntu-security) => Christian Ehrhardt
(paelzer)
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https://bugs.launchpad.net/bugs/1841936
Title:
Rebuild haproxy with openssl 1.1.1 will change features (bionic)
Status in HAProxy:
Fix Released
Status in haproxy package in Ubuntu:
Fix Released
Status in haproxy source package in Bionic:
Fix Committed
Bug description:
[Impact]
* openssl 1.1.1 has been backported to Bionic for its longer
support upstream period
* That would allow the extra feature of TLSv1.3 in some consuming
packages what seems "for free". Just with a no change rebuild it would
pick that up.
[Test Case]
* run "haproxy -vv" and check the reported TLS versions to include
1.3
[Regression Potential]
* This should be low, the code already runs against the .so of the newer
openssl library. This would only make it recognize the newer TLS
support.
i'd expect more trouble as-is with the somewhat big delta between what
it was built against vs what it runs with than afterwards.
* [1] and [2] indicate that any config that would have been made for
TLSv1.2 [1] would not apply to the v1.3 as it would be configured in
[2].
It is good to have no entry for [2] yet as following the defaults of
openssl is the safest as that would be updated if new insights/CVEs are
known.
But this could IMHO be the "regression that I'd expect", one explcitly
configured the v1.2 things and once both ends support v1.3 that might
be auto-negotiated. One can then set "force-tlsv12" but that is an
administrative action [3]
* Yet AFAIK this fine grained control [2] for TLSv1.3 only exists in
>=1.8.15 [4] and Bionic is on haproxy 1.8.8. So any user of TLSv1.3 in
Bionic haproxy would have to stay without that. There are further
changes to TLS v1.3 handling enhancements [5] but also fixes [6] which
aren't in 1.8.8 in Bionic.
So one could say enabling this will enable an inferior TLSv1.3 and one
might better not enable it, for an SRU the bar to not break old
behavior is intentionally high - I tried to provide as much as possible
background, the decision is up to the SRU team.
[1]:
https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#3.1-ssl-default-bind-ciphers
[2]:
https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#3.1-ssl-default-bind-ciphersuites
[3]:
https://www.haproxy.com/documentation/hapee/1-8r2/traffic-management/tls/#define-bind-directives-on-the-frontend
[4]: https://github.com/haproxy/haproxy/blob/master/CHANGELOG#L2131
[5]:
https://github.com/haproxy/haproxy/commit/526894ff3925d272c13e57926aa6b5d9d8ed5ee3
[6]:
https://github.com/haproxy/haproxy/commit/bc34cd1de2ee80de63b5c4d319a501fc0d4ea2f5
[Other Info]
* If this is nack'ed we will need an upload that prevents to enable
TLSv1.3 to avoid enabling it by accident on e.g. a security update.
---
haproxy needs to be rebuilt after #1797386 to take advantage of
TLSv1.3.
(If that's not desirable for some reason, then maybe TLSv1.3 should be
actively disabled to avoid any surprises in case of a future bug fix
release.)
---
Output of haproxy -vv with stock package:
Built with OpenSSL version : OpenSSL 1.1.0g 2 Nov 2017
Running on OpenSSL version : OpenSSL 1.1.1 11 Sep 2018 (VERSIONS DIFFER!)
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports : TLSv1.0 TLSv1.1 TLSv1.2
---
Output after rebuilding the package from source:
Built with OpenSSL version : OpenSSL 1.1.1 11 Sep 2018
Running on OpenSSL version : OpenSSL 1.1.1 11 Sep 2018
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports : TLSv1.0 TLSv1.1 TLSv1.2 TLSv1.3
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