# info > PAM_SHELLS

[PAM_SHELLS(8)](https://www.chedong.com/phpMan.php/man/PAMSHELLS/8/markdown)                  Linux-PAM Manual                  [PAM_SHELLS(8)](https://www.chedong.com/phpMan.php/man/PAMSHELLS/8/markdown)

## NAME
       pam_shells - PAM module to check for valid login shell

## SYNOPSIS
       pam_shells.so

## DESCRIPTION
       pam_shells is a PAM module that only allows access to the system if the
       user's shell is listed in /etc/shells.

       It also checks if /etc/shells is a plain file and not world writable.

## OPTIONS
       This module does not recognise any options.

## MODULE TYPES PROVIDED
       The auth and account module types are provided.

## RETURN VALUES
       PAM_AUTH_ERR
           Access to the system was denied.

       PAM_SUCCESS
           The user's login shell was listed as valid shell in /etc/shells.

       PAM_SERVICE_ERR
           The module was not able to get the name of the user.

## EXAMPLES
           auth  required  pam_shells.so

## SEE ALSO
       [shells(5)](https://www.chedong.com/phpMan.php/man/shells/5/markdown), [pam.conf(5)](https://www.chedong.com/phpMan.php/man/pam.conf/5/markdown), [pam.d(5)](https://www.chedong.com/phpMan.php/man/pam.d/5/markdown), [pam(7)](https://www.chedong.com/phpMan.php/man/pam/7/markdown)

## AUTHOR
       pam_shells was written by Erik Troan <<ewt@redhat.com>>.

Linux-PAM Manual                  06/08/2020                     [PAM_SHELLS(8)](https://www.chedong.com/phpMan.php/man/PAMSHELLS/8/markdown)