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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>sserver — MIT Kerberos Documentation</title> <link rel="stylesheet" href="../../_static/agogo.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../../_static/kerb.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../', VERSION: '1.15.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <link rel="author" title="About these documents" href="../../about.html" /> <link rel="copyright" title="Copyright" href="../../copyright.html" /> <link rel="top" title="MIT Kerberos Documentation" href="../../index.html" /> <link rel="up" title="Administration programs" href="index.html" /> <link rel="next" title="MIT Kerberos defaults" href="../../mitK5defaults.html" /> <link rel="prev" title="k5srvutil" href="k5srvutil.html" /> </head> <body> <div class="header-wrapper"> <div class="header"> <h1><a href="../../index.html">MIT Kerberos Documentation</a></h1> <div class="rel"> <a href="../../index.html" title="Full Table of Contents" accesskey="C">Contents</a> | <a href="k5srvutil.html" title="k5srvutil" accesskey="P">previous</a> | <a href="../../mitK5defaults.html" title="MIT Kerberos defaults" accesskey="N">next</a> | <a href="../../genindex.html" title="General Index" accesskey="I">index</a> | <a href="../../search.html" title="Enter search criteria" accesskey="S">Search</a> | <a href="mailto:krb5-bugs@mit.edu?subject=Documentation__sserver">feedback</a> </div> </div> </div> <div class="content-wrapper"> <div class="content"> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="sserver"> <span id="sserver-8"></span><h1>sserver<a class="headerlink" href="#sserver" title="Permalink to this headline">¶</a></h1> <div class="section" id="synopsis"> <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2> <p><strong>sserver</strong> [ <strong>-p</strong> <em>port</em> ] [ <strong>-S</strong> <em>keytab</em> ] [ <em>server_port</em> ]</p> </div> <div class="section" id="description"> <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> <p>sserver and <a class="reference internal" href="../../user/user_commands/sclient.html#sclient-1"><em>sclient</em></a> are a simple demonstration client/server application. When sclient connects to sserver, it performs a Kerberos authentication, and then sserver returns to sclient the Kerberos principal which was used for the Kerberos authentication. It makes a good test that Kerberos has been successfully installed on a machine.</p> <p>The service name used by sserver and sclient is sample. Hence, sserver will require that there be a keytab entry for the service <tt class="docutils literal"><span class="pre">sample/hostname.domain.name@REALM.NAME</span></tt>. This keytab is generated using the <a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a> program. The keytab file is usually installed as <tt class="docutils literal"><span class="pre">FILE:/etc/krb5.keytab</span></tt>.</p> <p>The <strong>-S</strong> option allows for a different keytab than the default.</p> <p>sserver is normally invoked out of inetd(8), using a line in <tt class="docutils literal"><span class="pre">/etc/inetd.conf</span></tt> that looks like this:</p> <div class="highlight-python"><pre>sample stream tcp nowait root /usr/local/sbin/sserver sserver</pre> </div> <p>Since <tt class="docutils literal"><span class="pre">sample</span></tt> is normally not a port defined in <tt class="docutils literal"><span class="pre">/etc/services</span></tt>, you will usually have to add a line to <tt class="docutils literal"><span class="pre">/etc/services</span></tt> which looks like this:</p> <div class="highlight-python"><pre>sample 13135/tcp</pre> </div> <p>When using sclient, you will first have to have an entry in the Kerberos database, by using <a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a>, and then you have to get Kerberos tickets, by using <a class="reference internal" href="../../user/user_commands/kinit.html#kinit-1"><em>kinit</em></a>. Also, if you are running the sclient program on a different host than the sserver it will be connecting to, be sure that both hosts have an entry in /etc/services for the sample tcp port, and that the same port number is in both files.</p> <p>When you run sclient you should see something like this:</p> <div class="highlight-python"><pre>sendauth succeeded, reply is: reply len 32, contents: You are nlgilman@JIMI.MIT.EDU</pre> </div> </div> <div class="section" id="common-error-messages"> <h2>COMMON ERROR MESSAGES<a class="headerlink" href="#common-error-messages" title="Permalink to this headline">¶</a></h2> <ol class="arabic"> <li><p class="first">kinit returns the error:</p> <div class="highlight-python"><pre>kinit: Client not found in Kerberos database while getting initial credentials</pre> </div> <p>This means that you didn’t create an entry for your username in the Kerberos database.</p> </li> <li><p class="first">sclient returns the error:</p> <div class="highlight-python"><pre>unknown service sample/tcp; check /etc/services</pre> </div> <p>This means that you don’t have an entry in /etc/services for the sample tcp port.</p> </li> <li><p class="first">sclient returns the error:</p> <div class="highlight-python"><pre>connect: Connection refused</pre> </div> <p>This probably means you didn’t edit /etc/inetd.conf correctly, or you didn’t restart inetd after editing inetd.conf.</p> </li> <li><p class="first">sclient returns the error:</p> <div class="highlight-python"><pre>sclient: Server not found in Kerberos database while using sendauth</pre> </div> <p>This means that the <tt class="docutils literal"><span class="pre">sample/hostname@LOCAL.REALM</span></tt> service was not defined in the Kerberos database; it should be created using <a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a>, and a keytab file needs to be generated to make the key for that service principal available for sclient.</p> </li> <li><p class="first">sclient returns the error:</p> <div class="highlight-python"><pre>sendauth rejected, error reply is: "No such file or directory"</pre> </div> <p>This probably means sserver couldn’t find the keytab file. It was probably not installed in the proper directory.</p> </li> </ol> </div> <div class="section" id="environment"> <h2>ENVIRONMENT<a class="headerlink" href="#environment" title="Permalink to this headline">¶</a></h2> <p>See <a class="reference internal" href="../../user/user_config/kerberos.html#kerberos-7"><em>kerberos</em></a> for a description of Kerberos environment variables.</p> </div> <div class="section" id="see-also"> <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2> <p><a class="reference internal" href="../../user/user_commands/sclient.html#sclient-1"><em>sclient</em></a>, <a class="reference internal" href="../../user/user_config/kerberos.html#kerberos-7"><em>kerberos</em></a>, services(5), inetd(8)</p> </div> </div> </div> </div> </div> </div> <div class="sidebar"> <h2>On this page</h2> <ul> <li><a class="reference internal" href="#">sserver</a><ul> <li><a class="reference internal" href="#synopsis">SYNOPSIS</a></li> <li><a class="reference internal" href="#description">DESCRIPTION</a></li> <li><a class="reference internal" href="#common-error-messages">COMMON ERROR MESSAGES</a></li> <li><a class="reference internal" href="#environment">ENVIRONMENT</a></li> <li><a class="reference internal" href="#see-also">SEE ALSO</a></li> </ul> </li> </ul> <br/> <h2>Table of contents</h2> <ul class="current"> <li class="toctree-l1"><a class="reference internal" href="../../user/index.html">For users</a></li> <li class="toctree-l1 current"><a class="reference internal" href="../index.html">For administrators</a><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="../install.html">Installation guide</a></li> <li class="toctree-l2"><a class="reference internal" href="../conf_files/index.html">Configuration Files</a></li> <li class="toctree-l2"><a class="reference internal" href="../realm_config.html">Realm configuration decisions</a></li> <li class="toctree-l2"><a class="reference internal" 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