NAME

       pam_securetty - Limit root login to special devices

SYNOPSIS

       pam_securetty.so [debug]

DESCRIPTION

       pam_securetty is a PAM module that allows root logins only if the user is logging in on a
       "secure" tty, as defined by the listing in /etc/securetty. pam_securetty also checks to
       make sure that /etc/securetty is a plain file and not world writable. It will also allow
       root logins on the tty specified with console= switch on the kernel command line and on
       ttys from the /sys/class/tty/console/active.

       This module has no effect on non-root users and requires that the application fills in the
       PAM_TTY item correctly.

       For canonical usage, should be listed as a required authentication method before any
       sufficient authentication methods.

OPTIONS

       debug
           Print debug information.

       noconsole
           Do not automatically allow root logins on the kernel console device, as specified on
           the kernel command line or by the sys file, if it is not also specified in the
           /etc/securetty file.

MODULE TYPES PROVIDED

       Only the auth module type is provided.

RETURN VALUES

       PAM_SUCCESS
           The user is allowed to continue authentication. Either the user is not root, or the
           root user is trying to log in on an acceptable device.

       PAM_AUTH_ERR
           Authentication is rejected. Either root is attempting to log in via an unacceptable
           device, or the /etc/securetty file is world writable or not a normal file.

       PAM_INCOMPLETE
           An application error occurred. pam_securetty was not able to get information it
           required from the application that called it.

       PAM_SERVICE_ERR
           An error occurred while the module was determining the user's name or tty, or the
           module could not open /etc/securetty.

       PAM_USER_UNKNOWN
           The module could not find the user name in the /etc/passwd file to verify whether the
           user had a UID of 0. Therefore, the results of running this module are ignored.

EXAMPLES

           auth  required  pam_securetty.so
           auth  required  pam_unix.so

SEE ALSO

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

AUTHOR

       pam_securetty was written by Elliot Lee <sopwith@cuc.edu>.