/etc/pam.d/runuser is in util-linux 2.27.1-6ubuntu3.
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 | #%PAM-1.0
auth sufficient pam_rootok.so
session optional pam_keyinit.so revoke
session required pam_limits.so
session required pam_unix.so
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