/usr/share/doc/libpam-ldap/examples/pam.d/gdm is in libpam-ldap 186-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #%PAM-1.0
auth required /lib/security/pam_nologin.so
auth sufficient /lib/security/pam_ldap.so
auth required /lib/security/pam_unix_auth.so try_first_pass
account sufficient /lib/security/pam_ldap.so
account required /lib/security/pam_unix_acct.so
password required /lib/security/pam_cracklib.so
password sufficient /lib/security/pam_ldap.so
password required /lib/security/pam_pwdb.so use_first_pass
session sufficient /lib/security/pam_ldap.so
session required /lib/security/pam_unix_session.so
session optional /lib/security/pam_console.so
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