[Bug 1797386] Re: [SRU] OpenSSL 1.1.1 to 18.04 LTS

[Dimitri John Ledkov]

On Tue, 12 Mar 2019 at 19:35, Seth Arnold <1797386 at bugs.launchpad.net> wrote:
>
> On Tue, Mar 12, 2019 at 04:05:45PM -0000, Dimitri John Ledkov wrote:
> > defaults. And all of them however have committed to drop support for
> > those in 2020. My expectation is to follow suit, and set default
> > security level to 2, and require TLS1.2 shortly after 19.10 release.
>
> Can you expand upon this point a bit?
>
> Do you mean we will require tls 1.2 across all our supported releases
> at the same time?
>
> Or do you mean we will require tls 1.2 for 19.10 and newer? Will this be
> done as part of rolling out 19.10 or will we push an update to 19.10 that
> will change behaviour?
>
> Or something else?
>

I mean that, after 19.10 ships, and 20.04 development cycle opens, I
will upload openssl which sets compiled in TLS security default to
value 2, and sets minimum TLS 1.2 into 20.04 series.
Clients and servers, will be able to continue to configure lower
values via e.g. the SSL_CTX_set_security_level [1] and so on, to
establish less than TLS 1.2 / weaker keys / etc.
That's what my plan is for 20.04. I do not plan to backport this
change to prior releases. Mostly because apps would need to learn how
to use set_security_level etc, which stable software in bionic does
not currently do en mass.

W.r.t. web-browsers, I do expect them to release those changes to
their stable browser on all platforms. It it would mean that
eventually we'd backport stable Firefox with that change into bionic.
And google chrome from google on bionic will also drop tls1.0 and
tls1.1. So a limited exposure to dropping TLS1.0/1.1 in the clients
will be observed in 2020 on Ubuntu 18.04 LTS.

[1]
https://www.openssl.org/docs/man1.1.0/man3/SSL_CTX_set_security_level.html

-- 
Regards,

Dimitri.

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https://bugs.launchpad.net/bugs/1797386

Title:
  [SRU] OpenSSL 1.1.1 to 18.04 LTS

Status in openssl package in Ubuntu:
  In Progress
Status in libio-socket-ssl-perl source package in Bionic:
  New
Status in libnet-ssleay-perl source package in Bionic:
  New
Status in nova source package in Bionic:
  New
Status in openssl source package in Bionic:
  Incomplete
Status in python-cryptography source package in Bionic:
  New
Status in python2.7 source package in Bionic:
  New
Status in python3.6 source package in Bionic:
  New
Status in python3.7 source package in Bionic:
  New
Status in r-cran-openssl source package in Bionic:
  Fix Committed
Status in ruby-openssl source package in Bionic:
  Fix Committed
Status in ruby2.5 source package in Bionic:
  New

Bug description:
  [Impact]

   * OpenSSL 1.1.1 is an LTS release upstream, which will continue to
  receive security support for much longer than 1.1.0 series will.

   * OpenSSL 1.1.1 comes with support for TLS v1.3 which is expected to
  be rapidly adopted due to increased set of supported hashes & algoes,
  as well as improved handshake [re-]negotiation.

   * OpenSSL 1.1.1 comes with improved hw-acceleration capabilities.

   * OpenSSL 1.1.1 is ABI/API compatible with 1.1.0, however some
  software is sensitive to the negotiation handshake and may either need
  patches/improvements or clamp-down to maximum v1.2.

  [Test Case]

   * Rebuild all reverse dependencies

   * Execute autopkg tests for all of them

   * Clamp down to TLS v1.2 software that does not support TLS v1.3
  (e.g. mongodb)

   * Backport TLS v1.3 support patches, where applicable

  [Regression Potential]

   * Connectivity interop is the biggest issues which will be
  unavoidable with introducing TLS v1.3. However, tests on cosmic
  demonstrate that curl/nginx/google-chrome/mozilla-firefox connect and
  negotiate TLS v1.3 without issues.

   * Mitigation of discovered connectivity issues will be possible by
  clamping down to TLS v1.2 in either server-side or client-side
  software or by backporting relevant support fixes

   * Notable changes are listed here
  https://wiki.openssl.org/index.php/TLS1.3

   * Most common connectivity issues so far:
     - client verifies SNI in TLSv1.3 mode, yet client doesn't set hostname. Solution is client change to set hostname, or to clamp down the client to TLSv1.2.

     - session negotiation is different in TLSv1.3, existing client code
  may fail to create/negotiate/resume session. Clients need to learn how
  to use session callback.

   * This update bundles python 3.6 and 3.7 point releases

  [Other Info]

   * Previous FFe for OpenSSL in 18.10 is at
     https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1793092

   * TLS v1.3 support in NSS is expected to make it to 18.04 via
  security updates

   * TLS v1.3 support in GnuTLS is expected to be available in 19.04

   * Test OpenSSL is being prepared in
     https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3473

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