.\"     Title: pam_securetty
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/>
.\"      Date: 04/16/2008
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM Manual
.\"
.TH "PAM_SECURETTY" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual"
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.SH "NAME"
pam_securetty - Limit root login to special devices
.SH "SYNOPSIS"
.HP 17
\fBpam_securetty\.so\fR [debug]
.SH "DESCRIPTION"
.PP
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
\fI/etc/securetty\fR\. pam_securetty also checks to make sure that
\fI/etc/securetty\fR
is a plain file and not world writable\.
.PP
This module has no effect on non\-root users and requires that the application fills in the
\fBPAM_TTY\fR
item correctly\.
.PP
For canonical usage, should be listed as a
\fBrequired\fR
authentication method before any
\fBsufficient\fR
authentication methods\.
.SH "OPTIONS"
.PP
\fBdebug\fR
.RS 4
Print debug information\.
.RE
.SH "MODULE SERVICES PROVIDED"
.PP
Only the
\fBauth\fR
service is supported\.
.SH "RETURN VALUES"
.PP
PAM_SUCCESS
.RS 4
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\.
.RE
.PP
PAM_AUTH_ERR
.RS 4
Authentication is rejected\. Either root is attempting to log in via an unacceptable device, or the
\fI/etc/securetty\fR
file is world writable or not a normal file\.
.RE
.PP
PAM_INCOMPLETE
.RS 4
An application error occurred\. pam_securetty was not able to get information it required from the application that called it\.
.RE
.PP
PAM_SERVICE_ERR
.RS 4
An error occurred while the module was determining the user\'s name or tty, or the module could not open
\fI/etc/securetty\fR\.
.RE
.PP
PAM_IGNORE
.RS 4
The module could not find the user name in the
\fI/etc/passwd\fR
file to verify whether the user had a UID of 0\. Therefore, the results of running this module are ignored\.
.RE
.SH "EXAMPLES"
.PP

.sp
.RS 4
.nf
auth  required  pam_securetty\.so
auth  required  pam_unix\.so
      
.fi
.RE
.sp
.SH "SEE ALSO"
.PP

\fBsecuretty\fR(5),
\fBpam.conf\fR(5),
\fBpam.d\fR(8),
\fBpam\fR(8)
.SH "AUTHOR"
.PP
pam_securetty was written by Elliot Lee <sopwith@cuc\.edu>\.