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Linux 2.6 - man page for pam_selinux (linux section 8)

PAM_SELINUX(8)				 Linux-PAM Manual			   PAM_SELINUX(8)

NAME
       pam_selinux - PAM module to set the default security context

SYNOPSIS
       pam_selinux.so [close] [debug] [open] [nottys] [verbose] [select_context] [env_params]
		      [use_current_range]

DESCRIPTION
       In a nutshell, pam_selinux sets up the default security context for the next execed shell.

       When an application opens a session using pam_selinux, the shell that gets executed will
       be run in the default security context, or if the user chooses and the pam file allows the
       selected security context. Also the controlling tty will have it's security context
       modified to match the users.

       Adding pam_selinux into a pam file could cause other pam modules to change their behavior
       if the exec another application. The close and open option help mitigate this problem.
       close option will only cause the close portion of the pam_selinux to execute, and open
       will only cause the open portion to run. You can add pam_selinux to the config file twice.
       Add the pam_selinux close as the executes the open pass through the modules, pam_selinux
       open_session will happen last. When PAM executes the close pass through the modules
       pam_selinux close_session will happen first.

OPTIONS
       close
	   Only execute the close_session portion of the module.

       debug
	   Turns on debugging via syslog(3).

       open
	   Only execute the open_session portion of the module.

       nottys
	   Do not try to setup the ttys security context.

       verbose
	   attempt to inform the user when security context is set.

       select_context
	   Attempt to ask the user for a custom security context role. If MLS is on ask also for
	   sensitivity level.

       env_params
	   Attempt to obtain a custom security context role from PAM environment. If MLS is on
	   obtain also sensitivity level. This option and the select_context option are mutually
	   exclusive. The respective PAM environment variables are SELINUX_ROLE_REQUESTED,
	   SELINUX_LEVEL_REQUESTED, and SELINUX_USE_CURRENT_RANGE. The first two variables are
	   self describing and the last one if set to 1 makes the PAM module behave as if the
	   use_current_range was specified on the command line of the module.

       use_current_range
	   Use the sensitivity level of the current process for the user context instead of the
	   default level. Also suppresses asking of the sensitivity level from the user or
	   obtaining it from PAM environment.

MODULE TYPES PROVIDED
       Only the session module type is provided.

RETURN VALUES
       PAM_AUTH_ERR
	   Unable to get or set a valid context.

       PAM_SUCCESS
	   The security context was set successfully.

       PAM_USER_UNKNOWN
	   The user is not known to the system.

EXAMPLES
	   auth     required  pam_unix.so
	   session  required  pam_permit.so
	   session  optional  pam_selinux.so

SEE ALSO
       pam.conf(5), pam.d(5), pam(7)

AUTHOR
       pam_selinux was written by Dan Walsh <dwalsh@redhat.com>.

Linux-PAM Manual			    08/31/2010				   PAM_SELINUX(8)


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