/etc/security/sepermit.conf is in libpam-modules 1.1.3-7ubuntu2.3.
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 | # /etc/security/sepermit.conf
#
# Each line contains either:
# - an user name
# - a group name, with @group syntax
# - a SELinux user name, with %seuser syntax
# Each line can contain optional arguments separated by :
# The possible arguments are:
# - exclusive - only single login session will
# be allowed for the user and the user's processes
# will be killed on logout
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