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Linux 2.6 - man page for pam_securetty (linux section 8)

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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)
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