/usr/share/pam-configs/unix is in libpam-runtime 1.1.8-1ubuntu2.
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 13 14 15 16 17 18 19 20 21 22 23 | 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
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