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
/etc/securetty. pam_securetty also checks to make sure that
/etc/securetty is a plain file and not world writable.
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.
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 /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
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>.