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<title>User service daemon and client specification</title>
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<link href="ch-intro.html" rel="chapter" title="1 Introduction">
<link href="ch-client.html" rel="chapter" title="2 Client program usage">
<link href="ch-envir.html" rel="chapter" title="3 Execution environment of the service program">
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<link href="ch-notes.html#s-standards" rel="section" title="6.2 Standard services and directory management">
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<link href="ch-notes.html#s-noexcess" rel="section" title="6.4 Do not give away excessive privilege to userv-using facilities">
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[ <a href="ch-notes.html">previous</a> ]
[ <a href="#contents">Contents</a> ]
[ <a href="ch-intro.html">1</a> ]
[ <a href="ch-client.html">2</a> ]
[ <a href="ch-envir.html">3</a> ]
[ <a href="ch-config.html">4</a> ]
[ <a href="ch-ipass.html">5</a> ]
[ <a href="ch-notes.html">6</a> ]
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<h1>
User service daemon and client specification
<br></h1>
<hr>
<h2><a name="abstract"></a>Abstract</h2>
<p>
This is a specification for a Unix system facility to allow one program to
invoke another when only limited trust exists between them.
</p>
<hr>
<h2><a name="copyright"></a>Copyright Notice</h2>
<p>
<code>userv</code> is Copyright 1996-2003,2006 Ian Jackson; Copyright 2000 Ben Harris.
</p>
<p>
<code>userv</code> is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option) any
later version.
</p>
<p>
This program is distributed in the hope that it will be useful, but <em>without
any warranty</em>; without even the implied warranty of
<em>merchantability</em> or <em>fitness for a particular purpose</em>. See the
GNU General Public License for more details.
</p>
<p>
You should have received a copy of the GNU General Public License along with
<code>userv</code>; if not, write to the Free Software Foundation, 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA.
</p>
<hr>
<h2><a name="contents"></a>Contents</h2>
<ul>
<li><a href="ch-intro.html">1 Introduction</a><li><a href="ch-client.html">2 Client program usage</a>
<ul>
<li><a href="ch-client.html#s2.1">2.1 Options</a></li>
<li><a href="ch-client.html#s-optoverride">2.2 Security-overriding options</a>
</ul></li>
<li><a href="ch-envir.html">3 Execution environment of the service program</a>
<ul>
<li><a href="ch-envir.html#s3.1">3.1 File descriptors</a></li>
<li><a href="ch-envir.html#s3.2">3.2 Environment</a>
</ul></li>
<li><a href="ch-config.html">4 Service-side configuration</a>
<ul>
<li><a href="ch-config.html#s4.1">4.1 Configuration file syntax</a></li>
<li><a href="ch-config.html#s-directives">4.2 Configuration file directives</a></li>
<li><a href="ch-config.html#s-configerrors">4.3 Errors in the configuration file</a></li>
<li><a href="ch-config.html#s-defaults">4.4 Defaults</a>
</ul></li>
<li><a href="ch-ipass.html">5 Information passed through the client/daemon combination</a><li><a href="ch-notes.html">6 Applications and notes on use</a>
<ul>
<li><a href="ch-notes.html#s-examples">6.1 Examples</a></li>
<li><a href="ch-notes.html#s-standards">6.2 Standard services and directory management</a></li>
<li><a href="ch-notes.html#s-reducepriv">6.3 Reducing the number of absolutely privileged subsystems</a></li>
<li><a href="ch-notes.html#s-noexcess">6.4 Do not give away excessive privilege to <code>userv</code>-using facilities</a></li>
<li><a href="ch-notes.html#s-notreally">6.5 <code>userv</code> can often replace <code>sudo</code>, but not <code>really</code></a></li>
<li><a href="ch-notes.html#s-stdinerr">6.6 Error handling and input streams (eg stdin)</a></li>
<li><a href="ch-notes.html#s-nogeneral">6.7 Don't give access to general-purpose utilities</a></li>
</ul></li>
</ul>
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[ <a href="ch-notes.html">previous</a> ]
[ <a href="#contents">Contents</a> ]
[ <a href="ch-intro.html">1</a> ]
[ <a href="ch-client.html">2</a> ]
[ <a href="ch-envir.html">3</a> ]
[ <a href="ch-config.html">4</a> ]
[ <a href="ch-ipass.html">5</a> ]
[ <a href="ch-notes.html">6</a> ]
[ <a href="ch-intro.html">next</a> ]
</p>
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<p>
User service daemon and client specification
</p>
<address>
1.1.1<br>
<br>
Ian Jackson <code><a href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</a></code><br>
<br>
</address>
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