Public bug reported:

I have Kerberos authentication set up in Thunderbird for my mailbox.

My environment contains:

helga@helga-rashomon:~$ env | grep KRB
KRB5CCNAME=KCM:

This means that Kerberos authentication should work through the sssd-kcm
server.

I initialize Kerberos and verify that it functions correctly:

helga@helga-rashomon:~$ klist
Ticket cache: KCM:1000
Default principal: he...@example.org

Valid starting      Expires             Service principal
03/11/24 04:14:24   03/12/24 04:14:24   krbtgt/example....@example.org
03/11/24 04:15:24   03/12/24 04:14:24   HTTP/redmine.example.org@
        Ticket server: HTTP/redmine.example....@example.org

(listing redacted to say example.org instead of the real address. the
redmine listing shows that Firefox works correctly with this address)

However, when I open the Snap Thunderbird, it does not recognize this
Kerberos setup, showing me "The Kerberos/GSSAPI ticket was not accepted
by the IMAP server". klist -A likewise shows no changes.

The exact same setup works when I specify KRB5CCNAME=DIR:${HOME}/krb5cc in 
.profile instead.
The sssd-kcm setup also works in Thunderbird native and Flatpak profiles.

Considering the Flatpak specifically permits access to
/run/.heim_org.h5l.kcm-socket, could it be that the Thunderbird Snap is
not allowed to access this socket?

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

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

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https://bugs.launchpad.net/bugs/2056760

Title:
  [snap]Thunderbird doesn't authenticate with sssd-kcm

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