This file is indexed.

/usr/share/pam-configs/unix is in libpam-runtime 1.1.8-1ubuntu2.2.

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

The actual contents of the file can be viewed below.

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Name: Unix authentication
Default: yes
Priority: 256
Auth-Type: Primary
Auth:
	[success=end default=ignore]	pam_unix.so nullok_secure try_first_pass
Auth-Initial:
	[success=end default=ignore]	pam_unix.so nullok_secure
Account-Type: Primary
Account:
	[success=end new_authtok_reqd=done default=ignore]	pam_unix.so
Account-Initial:
	[success=end new_authtok_reqd=done default=ignore]	pam_unix.so
Session-Type: Additional
Session:
	required	pam_unix.so
Session-Initial:
	required	pam_unix.so
Password-Type: Primary
Password:
	[success=end default=ignore]	pam_unix.so obscure use_authtok try_first_pass sha512
Password-Initial:
	[success=end default=ignore]	pam_unix.so obscure sha512