Azure AD Linux Login Extension – sudo fails with PAM account management error: System error
As you all know, I’ve been playing around with the Azure Active Directory login extensions for both Linux and Windows. I came across a problem where the first sudo worked (after re-authenticating) and the second, with the same command, failed with sudo: PAM account management error: System error Trying to debug this was tricky. Along with a support engineer we were able to enable enough log to get to the bottom of the problem. First, edit /etc/pam.d/system-auth-aad and add the debug keyword whenever you see pam_aad.so. Adding “debug” will switch to verbose logging. For example:
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auth required pam_env.so auth sufficient pam_fprintd.so auth [success=done ignore=ignore default=die] pam_aad.so debug auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 1000 quiet_success auth required pam_deny.so account [success=done ignore=ignore default=die] pam_aad.so debug account required pam_unix.so account sufficient pam_localuser.so account sufficient pam_succeed_if.so uid < 1000 quiet account required pam_permit.so password requisite pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type= ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok remember=5 password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so -session optional pam_systemd.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so |
Once that is done, execute in one terminal the following command tail -f /var/log/secure. Execute the sudo that you know will fail (that is the…
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