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
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.
Print debug information.
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.
The user is allowed to continue authentication. Either the user
is not root, or the root user is trying to log in on an
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.
An application error occurred. pam_securetty was not able to get
information it required from the application that called it.
An error occurred while the module was determining the user's
name or tty, or the module could not open /etc/securetty.
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.
This page is part of the linux-pam (Pluggable Authentication Modules
for Linux) project. Information about the project can be found at
⟨https://fedorahosted.org/linux-pam/⟩. If you have a bug report for
this manual page, see ⟨https://fedorahosted.org/linux-pam/report⟩.
This page was obtained from the tarball Linux-PAM-1.3.0.tar.gz
fetched from ⟨http://www.linux-pam.org/library/⟩ on 2017-03-13. 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 email@example.com
Linux-PAM Manual 04/01/2016 PAM_SECURETTY(8)