/etc/pam.d/systemd-user is in systemd 215-17+deb8u7.
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 | #%PAM-1.0
# Used by systemd when launching systemd user instances.
@include common-account
@include common-session-noninteractive
auth required pam_deny.so
password required pam_deny.so
session optional pam_systemd.so
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