I agree that cached shadow would enable pam_unix to operate correctly.

As far as I'm aware, nss_updatedb does not support local caching of
shadow, only passwd and group, and the db option can't be used on the
shadow entry (only files and ldap) in nsswitch.conf. I presume that's
because of security implications?

The absence of cached shadow would rule out using pam_unix at this
stage.

It looks like your preferred option is to add "account" method support
to pam_ccreds, and the presumably amend pam-auth-update to include that
in the module processing.

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https://bugs.launchpad.net/bugs/799605

Title:
  pam-auth-update creates a 'common-account' that fails with cached
  logins

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