PAM_SELINUX(7)            (06/08/2020)             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

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              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)

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

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