pam_securetty - Limit root login to special devices
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
For canonical usage, should be listed as a required
before any sufficient
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.
Only the auth
module type is provided.
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.
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
An error occurred while the module was
determining the user's name or tty, or the module could not open
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.
auth required pam_securetty.so
auth required pam_unix.so
pam_securetty was written by Elliot Lee <firstname.lastname@example.org>.