03-20-2012
If you are not root, why do you expect to be able to masquerade as another user without authentication ?
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LEARN ABOUT DEBIAN
pam_securetty
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
/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>.
Linux-PAM Manual 06/04/2011 PAM_SECURETTY(8)