PAM_SECURETTY(8) Linux-PAM Manual PAM_SECURETTY(8)
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 the
securetty file. pam_securetty checks at first, if /etc/securetty
exists. If not and it was built with vendordir support, it will use
<vendordir>/securetty. pam_securetty also checks that the securetty
files are plain files 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 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 securetty file is world writable or
not a normal file.
PAM_BUF_ERR
Memory buffer error.
PAM_CONV_ERR
The conversation method supplied by the application failed to
obtain the username.
PAM_INCOMPLETE
The conversation method supplied by the application returned
PAM_CONV_AGAIN.
PAM_SERVICE_ERR
An error occurred while the module was determining the user's name
or tty, or the module could not open the securetty file.
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>.
Linux-PAM Manual 09/03/2021 PAM_SECURETTY(8)
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