pam_securetty(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON

PAM_SECURETTY(8)            Linux-PAM Manual            PAM_SECURETTY(8)

NAME         top

       pam_securetty - Limit root login to special devices

SYNOPSIS         top

       pam_securetty.so [debug]

DESCRIPTION         top

       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         top

       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         top

       Only the auth module type is provided.

RETURN VALUES         top

       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         top

           auth  required  pam_securetty.so
           auth  required  pam_unix.so

SEE ALSO         top

       securetty(5), pam.conf(5), pam.d(5), pam(8)

AUTHOR         top

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

COLOPHON         top

       This page is part of the linux-pam (Pluggable Authentication
       Modules for Linux) project.  Information about the project can be
       found at ⟨http://www.linux-pam.org/⟩.  If you have a bug report
       for this manual page, see ⟨//www.linux-pam.org/⟩.  This page was
       obtained from the tarball Linux-PAM-1.3.0.tar.bz2 fetched from
       ⟨http://www.linux-pam.org/library/⟩ on 2021-04-01.  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

Linux-PAM Manual               04/01/2016               PAM_SECURETTY(8)

Pages that refer to this page: securetty(5)