pam_selinux

PAM_SELINUX(7)                 Linux-PAM Manual                 PAM_SELINUX(7)

NAME
       pam_selinux - PAM module to set the default security context

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

DESCRIPTION
       pam_selinux is a PAM module that sets up the default SELinux security
       context for the next executed process.

       When a new session is started, the open_session part of the module
       computes and sets up the execution security context used for the next
       execve(2) call, the file security context for the controlling terminal,
       and the security context used for creating a new kernel keyring.

       When the session is ended, the close_session part of the module
       restores old security contexts that were in effect before the change
       made by the open_session part of the module.

       Adding pam_selinux into the PAM stack might disrupt behavior of other
       PAM modules which execute applications. To avoid that, pam_selinux.so
       open should be placed after such modules in the PAM stack, and
       pam_selinux.so close should be placed before them. When such a
       placement is not feasible, pam_selinux.so restore could be used to
       temporary restore original security contexts.

OPTIONS
       open
           Only execute the open_session part of the module.

       close
           Only execute the close_session part of the module.

       restore
           In open_session part of the module, temporarily restore the
           security contexts as they were before the previous call of the
           module. Another call of this module without the restore option will
           set up the new security contexts again.

       nottys
           Do not setup security context of the controlling terminal.

       debug
           Turn on debug messages via syslog(3).

       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_SUCCESS
           The security context was set successfully.

       PAM_SESSION_ERR
           Unable to get or set a valid context.

       PAM_USER_UNKNOWN
           The user is not known to the system.

       PAM_BUF_ERR
           Memory allocation error.

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

SEE ALSO
       execve(2), tty(4), pam.d(5), pam(7), selinux(8)

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

Linux-PAM Manual                  05/18/2017                    PAM_SELINUX(7)