pam_shells - PAM module to check for valid login shell

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

Linux-PAM                                          07/03/2025                                      PAM_SHELLS(8)

       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 needed files (e.g.  /etc/shells) are plain files and not world writable.

           auth  required  pam_shells.so

       The auth and account module types are provided.

       pam_shells - PAM module to check for valid login shell

       This module does not recognise any options.

       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_USER_UNKNOWN
           The user does not exist or the user's login shell could not be determined.

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

shells(5), pam.conf(5), pam.d(5), pam(7)

pam_shells.so