Conditionally skip username check within certificate principals #21
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Skip checking if the username exists within the SSH certificiate principals if a manual set of valid principals is defined
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This PR removes the requirement that a username must appear within a certificate's list of principals so long as an explicit set of valid principals is defined. This change was made so that the call to
c.CheckCerton line 166 will verify the certificate, but explicitly exclude checking principals because pam-ussh verifies principals later in the code.This change is related to #15.