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.\" Title: pam_securetty
.\" Author:
.\" Generator: DocBook XSL Stylesheets v1.70.1 <http://docbook.sf.net/>
.\" Date: 06/04/2006
.\" Manual: Linux\-PAM Manual
.\" Source: Linux\-PAM Manual
.\"
.TH "PAM_SECURETTY" "8" "06/04/2006" "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"
.TP 3n
\fBdebug\fR
Print debug information.
.SH "MODULE SERVICES PROVIDED"
.PP
Only the
\fBauth\fR
service is supported.
.SH "RETURN VALUES"
.TP 3n
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.
.TP 3n
PAM_AUTH_ERR
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.
.TP 3n
PAM_INCOMPLETE
An application error occurred. pam_securetty was not able to get information it required from the application that called it.
.TP 3n
PAM_SERVICE_ERR
An error occurred while the module was determining the user's name or tty, or the module could not open
\fI/etc/securetty\fR.
.TP 3n
PAM_IGNORE
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.
.SH "EXAMPLES"
.PP
.sp
.RS 3n
.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>.
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