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.
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.
MODULE TYPES PROVIDED
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
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.
Linux-PAM Manual 09/19/2013 PAM_SECURETTY(8)
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