This file is indexed.

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

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

# Load environment from /etc/environment and ~/.pam_environment
session      required pam_env.so readenv=1
session      required pam_env.so readenv=1 envfile=/etc/default/locale

# Always let the greeter start without authentication
auth      required pam_permit.so

# No action required for account management
account   required pam_permit.so

# Can't change password
password  required pam_deny.so

# Setup session
session   required pam_unix.so
session   optional pam_systemd.so