.\"     Title: pam_exec
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/>
.\"      Date: 06/16/2009
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM Manual
.\"  Language: English
.\"
.TH "PAM_EXEC" "8" "06/16/2009" "Linux-PAM Manual" "Linux\-PAM Manual"
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.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "Name"
pam_exec \- PAM module which calls an external command
.SH "Synopsis"
.fam C
.HP \w'\fBpam_exec\&.so\fR\ 'u
\fBpam_exec\&.so\fR [debug] [expose_authtok] [seteuid] [quiet] [log=\fIfile\fR] \fIcommand\fR [\fI\&.\&.\&.\fR]
.fam
.SH "DESCRIPTION"
.PP
pam_exec is a PAM module that can be used to run an external command\&.
.PP
The child\'s environment is set to the current PAM environment list, as returned by
\fBpam_getenvlist\fR(3)
In addition, the following PAM items are exported as environment variables:
\fIPAM_RHOST\fR,
\fIPAM_RUSER\fR,
\fIPAM_SERVICE\fR,
\fIPAM_TTY\fR,
\fIPAM_USER\fR
and
\fIPAM_TYPE\fR, which contains one of the module types:
\fBaccount\fR,
\fBauth\fR,
\fBpassword\fR,
\fBopen_session\fR
and
\fBclose_session\fR\&.
.SH "OPTIONS"
.PP
.PP
\fBdebug\fR
.RS 4
Print debug information\&.
.RE
.PP
\fBexpose_authtok\fR
.RS 4
During authentication the calling command can read the password from
\fBstdin\fR(3)\&.
.RE
.PP
\fBlog=\fR\fB\fIfile\fR\fR
.RS 4
The output of the command is appended to
\FCfile\F[]
.RE
.PP
\fBquiet\fR
.RS 4
Per default pam_exec\&.so will echo the exit status of the external command if it fails\&. Specifying this option will suppress the message\&.
.RE
.PP
\fBseteuid\fR
.RS 4
Per default pam_exec\&.so will execute the external command with the real user ID of the calling process\&. Specifying this option means the command is run with the effective user ID\&.
.RE
.SH "MODULE TYPES PROVIDED"
.PP
All module types (\fBauth\fR,
\fBaccount\fR,
\fBpassword\fR
and
\fBsession\fR) are provided\&.
.SH "RETURN VALUES"
.PP
.PP
PAM_SUCCESS
.RS 4
The external command was run successfully\&.
.RE
.PP
PAM_SERVICE_ERR
.RS 4
No argument or a wrong number of arguments were given\&.
.RE
.PP
PAM_SYSTEM_ERR
.RS 4
A system error occurred or the command to execute failed\&.
.RE
.PP
PAM_IGNORE
.RS 4

\fBpam_setcred\fR
was called, which does not execute the command\&.
.RE
.SH "EXAMPLES"
.PP
Add the following line to
\FC/etc/pam\&.d/passwd\F[]
to rebuild the NIS database after each local password change:
.sp
.if n \{\
.RS 4
.\}
.fam C
.ps -1
.nf
.if t \{\
.sp -1
.\}
.BB lightgray adjust-for-leading-newline
.sp -1

        passwd optional pam_exec\&.so seteuid make \-C /var/yp
      
.EB lightgray adjust-for-leading-newline
.if t \{\
.sp 1
.\}
.fi
.fam
.ps +1
.if n \{\
.RE
.\}
.sp
This will execute the command
.sp
.if n \{\
.RS 4
.\}
.fam C
.ps -1
.nf
.BB lightgray
make \-C /var/yp
.EB lightgray
.fi
.fam
.ps +1
.if n \{\
.RE
.\}
.sp
with effective user ID\&.
.SH "SEE ALSO"
.PP

\fBpam.conf\fR(5),
\fBpam.d\fR(5),
\fBpam\fR(8)
.SH "AUTHOR"
.PP
pam_exec was written by Thorsten Kukuk <kukuk@thkukuk\&.de>\&.