This file is indexed.

/etc/pam.d/lightdm-greeter is in lightdm 1.18.3-0ubuntu1.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#%PAM-1.0
auth    required        pam_permit.so
auth    optional        pam_gnome_keyring.so
auth    optional        pam_kwallet.so
auth    optional        pam_kwallet5.so
@include common-account
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close
session required        pam_limits.so
@include common-session
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open
session optional        pam_gnome_keyring.so auto_start
session optional        pam_kwallet.so auto_start
session optional        pam_kwallet5.so auto_start
session required        pam_env.so readenv=1
session required        pam_env.so readenv=1 user_readenv=1 envfile=/etc/default/locale