# pam_selinux

## 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
    


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