Public bug reported:

[Impact]

 * Thunderbird may become useless after booting into FIPS mode - it
refuses to connect to server displaying the following message:

Unexpected response from the server

This document cannot be displayed unless you install the Personal
Security Manager (PSM). Download and install PSM and try again, or
contact your system administrator.

This seems to be a result of the fact that despite Thunderbird for
Ubuntu being with FIPS support disabled there's a piece of code that
ignores the build flag and checks for `/proc/sys/crypto/fips_enabled`
status anyway.

Looks like upstream fix [1] needs to be applied to Thunderbird source
under security/nss.

[Test Case]

 * Configure an email account in Thunderbird. I was able to reproduce it with a 
gmail account.
 * Install FIPS modules as described in [2].
 * Boot into FIPS mode.
 * Open Thunderbird.

[Regression Potential]

 * I can't identify regression potential - this is clearly a bug fixed
upstream by a simple fix.

[Other Info]
 
 * Related Firefox bug: https://bugs.launchpad.net/bugs/1843044
 * I was able to backport this fix and test it - the problem was gone. Xenial 
build is available in ppa:dgadomski/thunderbird.


[1] 
https://hg.mozilla.org/projects/nss/raw-rev/55ba54adfcaea2f984a999a511eec5047462eb57
[2] https://docs.ubuntu.com/security-certs/en/fips

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: thunderbird (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: thunderbird (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: thunderbird (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: thunderbird (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1878155

Title:
  Thunderbird fails to connect to server in FIPS mode

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