This is pam_selinux, a module for setting the default security context after 
login via PAM.

Background:  SELinux provides a mechanism for allowing people to login with 
different security contexts.

The module takes these arguments:
The module takes these arguments:
    close           Only execute the close_session portion of the module.
    debug           Log debug messages (with priority DEBUG) to syslog.	
    nottys          Do not set security context on controlling tty
    verbose         Attempt to tell the user when security context is set.
    open            Only execute the open_session portion of the module.

Dan Walsh <dwalsh@redhat.com>