Kerberos authentication failure when accessing CIFS shares with gssproxy without impersonate

Solution Verified - Updated -

Issue

  • cifs.upcall[12345]: cifs_krb5_get_req: unable to get credentials for cifs-server.example.com
  • kernel: CIFS: VFS: Verify user has a krb5 ticket and keyutils is installed
  • Cannot access share if user default Kerberos does not have valid
  • Users should still able to mount even when the default Kerberos ccache does not contain the right TGT

Environment

  • Products
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 9
    • Red Hat Enterprise Linux 8
  • Packages
    • cifs-util
    • gssproxy
  • Prerequisite
    • Corresponding valid keytabs are installed in /var/lib/gssproxy/clients/
    • Share is accessable if Kerberos ticket is obtained manually

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