/security/sepermit.conf

 1# /etc/security/sepermit.conf
 2#
 3# Each line contains either:
 4#        - an user name
 5#        - a group name, with @group syntax
 6#        - a SELinux user name, with %seuser syntax
 7# Each line can contain optional arguments separated by :
 8# The possible arguments are:
 9#        - exclusive - only single login session will
10#          be allowed for the user and the user's processes
11#          will be killed on logout