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.\" This file is distributed according to the GNU General Public License.
.\" See the file COPYING in the top level source directory for details.
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.TH "UNIX2_CHKPWD" 8 "2003-03-21" "Linux-PAM 0.76" "Linux-PAM Manual"
.SH NAME
unix2_chkpwd \- helper binary that verifies the password of the current user
.SH "SYNOPSIS"
.ad l
.hy 0

/sbin/unix2_chkpwd \fIservicename\fR \fIusername\fR
.sp
.ad
.hy
.SH "DESCRIPTION"
.PP
\fBunix2_chkpwd\fR is a helper program for applications that verifies 
the password of the current user.  It is not intended to be run directly from 
the command line and logs a security violation if done so. 

It is typically installed setuid root or setgid shadow and called by
applications, which only wishes to do an user authentication and
nothing more.

.SH "OPTIONS"
.PP
unix2_pwdchk requires the following arguments:
.TP
\fIpam_service\fR
The name of the service using unix2_chkpwd. This is required to be one of
the services in /etc/pam.d
.TP
\fIusername\fR
The name of the user whose password you want to verify.

.SH "INPUTS"
.PP
unix2_pwdchk expects the password via stdin.

.SH "RETURN CODES"
.PP
\fBunix2_chkpwd\fR has the following return codes:
.TP
1
unix2_chkpwd was inappropriately called from the command line or the password is incorrect.

.TP
0
The password is correct.

.SH "HISTORY"
Written by Olaf Kirch loosely based on unix_chkpwd by Andrew Morgan

.SH "SEE ALSO"

.PP
\fBpam\fR(8)

.SH AUTHOR
Emily Ratliff.