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pam_selinux(8) [centos man page]

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

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(8), selinux(8)

AUTHOR

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

Linux-PAM Manual						    06/18/2013							    PAM_SELINUX(8)

Check Out this Related Man Page

PAM_KEYINIT(8)							 Linux-PAM Manual						    PAM_KEYINIT(8)

NAME

       pam_keyinit - Kernel session keyring initialiser module

SYNOPSIS

       pam_keyinit.so [debug] [force] [revoke]

DESCRIPTION

       The pam_keyinit PAM module ensures that the invoking process has a session keyring other than the user default session keyring.

       The session component of the module checks to see if the process's session keyring is the user default, and, if it is, creates a new
       anonymous session keyring with which to replace it.

       If a new session keyring is created, it will install a link to the user common keyring in the session keyring so that keys common to the
       user will be automatically accessible through it.

       The session keyring of the invoking process will thenceforth be inherited by all its children unless they override it.

       This module is intended primarily for use by login processes. Be aware that after the session keyring has been replaced, the old session
       keyring and the keys it contains will no longer be accessible.

       This module should not, generally, be invoked by programs like su, since it is usually desirable for the key set to percolate through to
       the alternate context. The keys have their own permissions system to manage this.

       This module should be included as early as possible in a PAM configuration, so that other PAM modules can attach tokens to the keyring.

       The keyutils package is used to manipulate keys more directly. This can be obtained from:

       Keyutils[1]

OPTIONS

       debug
	   Log debug information with syslog(3).

       force
	   Causes the session keyring of the invoking process to be replaced unconditionally.

       revoke
	   Causes the session keyring of the invoking process to be revoked when the invoking process exits if the session keyring was created for
	   this process in the first place.

MODULE TYPES PROVIDED

       Only the session module type is provided.

RETURN VALUES

       PAM_SUCCESS
	   This module will usually return this value

       PAM_AUTH_ERR
	   Authentication failure.

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_IGNORE
	   The return value should be ignored by PAM dispatch.

       PAM_SERVICE_ERR
	   Cannot determine the user name.

       PAM_SESSION_ERR
	   This module will return this value if its arguments are invalid or if a system error such as ENOMEM occurs.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES

       Add this line to your login entries to start each login session with its own session keyring:

	   session  required  pam_keyinit.so

       This will prevent keys from one session leaking into another session for the same user.

SEE ALSO

       pam.conf(5), pam.d(5), pam(7) keyctl(1)

AUTHOR

       pam_keyinit was written by David Howells, <dhowells@redhat.com>.

NOTES

	1. Keyutils
	   http://people.redhat.com/~dhowells/keyutils/

Linux-PAM Manual						    06/04/2011							    PAM_KEYINIT(8)
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