/usr/share/pam-configs/touch-extrausers is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.
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 | Name: Extrausers authentication
Default: yes
Priority: 257
Auth-Type: Primary
Auth:
[success=end authinfo_unavail=ignore default=die] pam_extrausers.so nodelay nullok try_first_pass
Auth-Initial:
[success=end authinfo_unavail=ignore default=die] pam_extrausers.so nodelay nullok
Password-Type: Primary
Password:
[success=end default=ignore] pam_extrausers.so minlen=4 sha512 use_authtok try_first_pass
Password-Initial:
[success=end default=ignore] pam_extrausers.so minlen=4 sha512
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