What is the situation that "pam_localuser.so" fails and "pam_succeed_if.so uid < 500 quiet" succeeds in /etc/pam.d/password-auth ?

Solution Verified - Updated -

Issue

  • Here is a default password-auth configuration.
[root@rhel6 ~]# grep ^account /etc/pam.d/password-auth
account     required      pam_unix.so
account     sufficient    pam_localuser.so
account     sufficient    pam_succeed_if.so uid < 500 quiet
account     required      pam_permit.so
  • What is the situation that "pam_localuser.so" fails and "pam_succeed_if.so uid < 500 quiet" succeeds?

Environment

  • Red Hat Enterprise Linux 6
  • pam

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