bionic (8) pam_selinux.8.gz

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>.