SELinux prevents using tmux as a shell when user logs in from console in Red Hat Enterprise Linux 7

Issue

• SELinux prevents it from being used as a shell when the user logs in from console.

# grep tmux /etc/shells
/usr/bin/tmux
# useradd -s /usr/bin/tmux testuser
# passwd testuser

• The login as testuser from a console fails due to a SELinux AVC report.

kernel: type=1400 audit(xxxxxxxxxxxx.xxx:x): avc:  denied  { entrypoint } for  pid=1000 comm="login" path="/usr/bin/tmux" dev="dm-0" ino=xxxxxxx scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:screen_exec_t:s0 tclass=file