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)