/etc/pam.d/sddm-autologin is in sddm 0.14.0-4+deb9u1.
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 24 25 26 27 28 29 30 31 32 | #%PAM-1.0
# Block login if they are globally disabled
auth requisite pam_nologin.so
auth required pam_permit.so
@include common-account
# SELinux needs to be the first session rule. This ensures that any
# lingering context has been cleared. Without this it is possible that a
# module could execute code in the wrong domain.
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close
# Create a new session keyring.
session optional pam_keyinit.so force revoke
session required pam_limits.so
session required pam_loginuid.so
@include common-session
# SELinux needs to intervene at login time to ensure that the process starts
# in the proper default security context. Only sessions which are intended
# to run in the user's context should be run after this.
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open
@include common-password
# From the pam_env man page
# Since setting of PAM environment variables can have side effects to other modules, this module should be the last one on the stack.
# Load environment from /etc/environment
session required pam_env.so
# Load environment from /etc/default/locale
session required pam_env.so envfile=/etc/default/locale
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