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Description of problem:
In case of Smart Card authentication, the krb5_child of sssd runs as root in order to be able to access the pcscd socket and relies on setting the KRB5CCNAME environment variable to access the ccache on behalf of the user.
However, with KCM, root cannot access another user's ccache, see e.g. this explanation by MIT krb5 upstream:
https://github.com/krb5/krb5/pull/557#issuecomment-254834623
Therefore we need to obtain the credentials as a user who can talk to pcscd (typically root) but then drop the privileges to the user who is logging and and save the credentials to the ccache as that user.
Version-Release number of selected component (if applicable):
up to sssd-2.0-24
How reproducible:
always
Steps to Reproduce:
1. login to an IPA client with a smart card
2. klist
3.
Actual results:
credential cache KCM:$uid not found
Expected results:
a valid credential cache
Additional info:
see e.g. https://bugzilla.redhat.com/show_bug.cgi?id=1441764#c8 or a thread on freeipa-users titled "smartcard auth + kerberos ticket?" from Nov-15 2018.