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<li class="toctree-l4"><a class="reference internal" href="../sysadmin.html#the-plain-mechanism-sasl-checkpass-and-plaintext-passwords">The PLAIN mechanism, <code class="docutils literal"><span class="pre">sasl_checkpass()</span></code>, and plaintext passwords</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../manpages.html">Man pages</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../manpages.html#library-files">(3) Library Files</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl.html"><strong>SASL</strong> - SASL Authentication Library</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_authorize_t.html"><strong>sasl_authorize_t</strong> - The SASL authorization callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_auxprop.html"><strong>sasl_auxprop</strong> - How to work with SASL auxiliary properties</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_auxprop_add_plugin.html"><strong>sasl_auxprop_add_plugin</strong> - add a SASL auxiliary property plugin</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_auxprop_getctx.html"><strong>sasl_auxprop_getctx</strong> - Acquire an auxiliary property context</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_auxprop_request.html"><strong>sasl_auxprop_request</strong> - Request auxiliary properties from SASL</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_callbacks.html"><strong>sasl_callbacks</strong> - How to work with SASL callbacks</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_canon_user_t.html"><strong>sasl_canon_user_t</strong> - Application-supplied user canonicalization function</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_canonuser_add_plugin.html"><strong>sasl_canonuser_add_plugin</strong> - add a SASL user canonicalization plugin</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_chalprompt_t.html"><strong>sasl_chalprompt_t</strong> - Realm acquisition callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_checkapop.html"><strong>sasl_checkapop</strong> - Check an APOP challenge/response</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_checkpass.html"><strong>sasl_checkpass</strong> - Check a plaintext password</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_add_plugin.html"><strong>sasl_client_add_plugin</strong> - add a SASL client plugin</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_done.html"><strong>sasl_client_done</strong> - Cleanup function</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_init.html"><strong>sasl_client_init</strong> - SASL client authentication initialization</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_new.html"><strong>sasl_client_new</strong> - Create a new client authentication object</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_plug_init_t.html"><strong>sasl_client_plug_init_t</strong> - client plug‐in entry point</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_start.html"><strong>sasl_client_start</strong> - Begin an authentication negotiation</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_client_step.html"><strong>sasl_client_step</strong> - Perform a step in the authentication negotiation</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_decode.html"><strong>sasl_decode</strong> - Decode data received</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_decode64.html"><strong>sasl_decode64</strong> - Decode base64 string</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_dispose.html"><strong>sasl_dispose</strong> - Dispose of a SASL connection object</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_done.html"><strong>sasl_done</strong> - Dispose of a SASL connection object</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_encode.html"><strong>sasl_encode</strong> - Encode data for transport to authenticated host</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_encode64.html"><strong>sasl_encode64</strong> - Encode base64 string</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_encodev.html"><strong>sasl_encodev</strong> - Encode data for transport to authenticated host</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_erasebuffer.html"><strong>sasl_erasebuffer</strong> - erase buffer</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_errdetail.html"><strong>sasl_errdetail</strong> - Retrieve detailed information about an error</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_errors.html"><strong>sasl_errors</strong> - SASL error codes</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_errstring.html"><strong>sasl_errstring</strong> - Translate a SASL return code to a human-readable form</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getcallback_t.html"><strong>sasl_getcallback_t</strong> - callback function to lookup a sasl_callback_t for a connection</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getconfpath_t.html"><strong>sasl_getconfpath_t</strong> - The SASL callback to indicate location of the config files</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getopt_t.html"><strong>sasl_getopt_t</strong> - The SASL get option callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getpath_t.html"><strong>sasl_getpath_t</strong> - The SASL callback to indicate location of the mechanism drivers</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getprop.html"><strong>sasl_getprop</strong> - Get a SASL property</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getrealm_t.html"><strong>sasl_getrealm_t</strong> - Realm Acquisition Callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getsecret_t.html"><strong>sasl_getsecret_t</strong> - The SASL callback for secrets (passwords)</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_getsimple_t.html"><strong>sasl_getsimple_t</strong> - The SASL callback for username/authname/realm</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_global_listmech.html"><strong>sasl_global_listmech</strong> - Retrieve a list of the supported SASL mechanisms</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_idle.html"><strong>sasl_idle</strong> - Perform precalculations during an idle period</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_listmech.html"><strong>sasl_listmech</strong> - Retrieve a list of the supported SASL mechanisms</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_log_t.html"><strong>sasl_log_t</strong> - The SASL logging callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_add_plugin.html"><strong>sasl_server_add_plugin</strong> - add a SASL server plugin</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_done.html"><strong>sasl_server_done</strong> - Cleanup function</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_init.html"><strong>sasl_server_init</strong> - SASL server authentication initialization</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_new.html"><strong>sasl_server_new</strong> - Create a new server authentication object</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_plug_init_t.html"><strong>sasl_server_plug_init_t</strong> - server plug‐in entry point</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_start.html"><strong>sasl_server_start</strong> - Begin an authentication negotiation</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_step.html"><strong>sasl_server_step</strong> - Perform a step in the authentication negotiation</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_userdb_checkpass_t.html"><strong>sasl_server_userdb_checkpass_t</strong> - Plaintext Password Verification Callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_server_userdb_setpass_t.html"><strong>sasl_server_userdb_setpass_t</strong> - UserDB Plaintext Password Setting Callback</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_set_alloc.html"><strong>sasl_set_alloc</strong> - set the memory allocation functions used by the SASL library</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_set_mutex.html"><strong>sasl_set_mutex</strong> - set the mutex lock functions used by the SASL library</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_seterror.html"><strong>sasl_seterror</strong> - set the error string</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_setpass.html"><strong>sasl_setpass</strong> - Check a plaintext password</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_setprop.html"><strong>sasl_setprop</strong> - Set a SASL property</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_user_exists.html"><strong>sasl_user_exists</strong> - Check if a user exists on server</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_usererr.html"><strong>sasl_usererr</strong> - Remove information leak about accounts from sasl error codes</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_utf8verify.html"><strong>sasl_utf8verify</strong> - Verify a string is valid utf8</a></li>
<li class="toctree-l4"><a class="reference internal" href="../reference/manpages/library/sasl_verifyfile_t.html"><strong>sasl_verifyfile_t</strong> - The SASL file verification</a></li>
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<div class="section" id="how-do-i-configure-openldap-sasl-gssapi">
<h1>How do I configure OpenLDAP +SASL+GSSAPI?<a class="headerlink" href="#how-do-i-configure-openldap-sasl-gssapi" title="Permalink to this headline">¶</a></h1>
<p>This article assumes that you have read and followed the SASL chapter of the <a class="reference external" href="http://www.openldap.org/doc/admin24/sasl.html">OpenLDAP Administrator’s Guide</a>. You should have a Kerberos server installed (such as Heimdal or MIT), and created all the appropriate principals (client and service) necessary.</p>
<p>To verify that you have the Cyrus <a class="reference internal" href="../gssapi.html#gssapi"><span class="std std-ref">GSSAPI</span></a> mechanism properly installed, use the pluginviewer command. For instance:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">server</span><span class="p">:</span><span class="o">~</span><span class="c1"># pluginviewer | grep -i gssapi</span>
<span class="n">CRAM</span><span class="o">-</span><span class="n">MD5</span> <span class="n">PLAIN</span> <span class="n">NTLM</span> <span class="n">GSSAPI</span> <span class="n">OTP</span> <span class="n">DIGEST</span><span class="o">-</span><span class="n">MD5</span> <span class="n">ANONYMOUS</span> <span class="n">LOGIN</span> <span class="n">EXTERNAL</span>
<span class="n">Plugin</span> <span class="s2">"gssapiv2"</span> <span class="p">[</span><span class="n">loaded</span><span class="p">],</span> <span class="n">API</span> <span class="n">version</span><span class="p">:</span> <span class="mi">4</span>
<span class="n">SASL</span> <span class="n">mechanism</span><span class="p">:</span> <span class="n">GSSAPI</span><span class="p">,</span> <span class="n">best</span> <span class="n">SSF</span><span class="p">:</span> <span class="mi">56</span><span class="p">,</span> <span class="n">supports</span> <span class="n">setpass</span><span class="p">:</span> <span class="n">no</span>
<span class="n">CRAM</span><span class="o">-</span><span class="n">MD5</span> <span class="n">PLAIN</span> <span class="n">NTLM</span> <span class="n">GSSAPI</span> <span class="n">OTP</span> <span class="n">DIGEST</span><span class="o">-</span><span class="n">MD5</span> <span class="n">ANONYMOUS</span> <span class="n">LOGIN</span> <span class="n">EXTERNAL</span>
<span class="n">Plugin</span> <span class="s2">"gssapiv2"</span> <span class="p">[</span><span class="n">loaded</span><span class="p">],</span> <span class="n">API</span> <span class="n">version</span><span class="p">:</span> <span class="mi">4</span>
<span class="n">SASL</span> <span class="n">mechanism</span><span class="p">:</span> <span class="n">GSSAPI</span><span class="p">,</span> <span class="n">best</span> <span class="n">SSF</span><span class="p">:</span> <span class="mi">56</span>
</pre></div>
</div>
<p>Both your server and client systems will need to have this mechanism installed. If not, you may find the mechanism located in a binary package that you do not yet have installed, or you may need to recompile your Cyrus SASL installation.</p>
<p>On your client system, search the Root DSE of the server to view advertised mechanisms:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">client</span><span class="p">:</span><span class="o">~</span><span class="c1"># ldapsearch -LLL -x -H ldap://ldap.example.org -s "base" -b "" supportedSASLMechanisms</span>
<span class="n">dn</span><span class="p">:</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">DIGEST</span><span class="o">-</span><span class="n">MD5</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">NTLM</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">GSSAPI</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">OTP</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">CRAM</span><span class="o">-</span><span class="n">MD5</span>
</pre></div>
</div>
<p>If you received a No Such Object error, you may have an <a class="reference external" href="http://www.openldap.org/doc/admin24/appendix-common-errors.html#ldap_sasl_interactive_bind_s">ACL misconfiguration on your server</a>.</p>
<p>If you do not see GSSAPI listed, verify that the server can read the appropriate keytab. The default is <code class="docutils literal"><span class="pre">/etc/krb5.keytab</span></code> and is typically only readable by the root user. If your Kerberos library supports it, you can create a keytab in an alternate location, such as <code class="docutils literal"><span class="pre">/etc/krb5.keytab-ldap</span></code>, with only your LDAP service principal, and read permissions for your OpenLDAP user.</p>
<p>If your OpenLDAP server is looking for an unexpected principal within your keytab, use sasl-host and sasl-realm to influence which principal it will use (see the slapd.conf man page).</p>
<p>For more control over how the SASL library operates within the OpenLDAP? server, you can create a slapd.conf SASL configuration. This is not the same configuration file as the OpenLDAP configuration (slapd.conf). The location of this file is dependent how on Cyrus SASL was compiled (via the <code class="docutils literal"><span class="pre">--with-plugindir</span></code> option during configure). It is the directory where your plugins are installed.</p>
<p>For instance, if you create /usr/lib/sasl2/slapd.conf (assuming that is the correct location on your system) with the following contents:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">keytab</span><span class="p">:</span> <span class="o">/</span><span class="n">etc</span><span class="o">/</span><span class="n">krb5</span><span class="o">.</span><span class="n">keytab</span><span class="o">-</span><span class="n">ldap</span>
<span class="n">mech_list</span><span class="p">:</span> <span class="n">CRAM</span><span class="o">-</span><span class="n">MD5</span> <span class="n">DIGEST</span><span class="o">-</span><span class="n">MD5</span> <span class="n">GSSAPI</span>
</pre></div>
</div>
<p>then the server will search within /etc/krb5.keytab-ldap when initializing the GSSAPI plugin. The server will only offer the mechanisms listed in mech_list. If mech_list is not specified, the server will offer all the mechanisms available, and that it can initialize.</p>
<p>Once you have verified that the server is advertising GSSAPI support, then try:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">client</span><span class="p">:</span><span class="o">~</span><span class="c1"># ldapsearch -LLL -Y GSSAPI -H ldap://ldap.example.org -s "base" -b "" supportedSASLMechanisms</span>
<span class="n">SASL</span><span class="o">/</span><span class="n">GSSAPI</span> <span class="n">authentication</span> <span class="n">started</span>
<span class="n">SASL</span> <span class="n">username</span><span class="p">:</span> <span class="n">host</span><span class="o">/</span><span class="n">client</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">org</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">ORG</span>
<span class="n">SASL</span> <span class="n">SSF</span><span class="p">:</span> <span class="mi">56</span> <span class="n">SASL</span> <span class="n">data</span> <span class="n">security</span> <span class="n">layer</span> <span class="n">installed</span><span class="o">.</span>
<span class="n">dn</span><span class="p">:</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">DIGEST</span><span class="o">-</span><span class="n">MD5</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">NTLM</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">GSSAPI</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">OTP</span>
<span class="n">supportedSASLMechanisms</span><span class="p">:</span> <span class="n">CRAM</span><span class="o">-</span><span class="n">MD5</span>
</pre></div>
</div>
<p>If you receive a list of mechanisms, then congratulations, you’re done.</p>
<p>If instead you receive an error, then it’s possible that your client is requesting a service principal that mismatches what your server is using.</p>
<p>Verify that you have received a TGT ticket from your kerberos server, and that you have also received a service principal ticket for the server (e.g. <a class="reference external" href="mailto:ldap/ldap.example.org%40EXAMPLE.ORG">ldap/ldap<span>.</span>example<span>.</span>org<span>@</span>EXAMPLE<span>.</span>ORG</a>). Use klist to verify:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">client</span><span class="p">:</span><span class="o">~</span><span class="c1"># klist</span>
<span class="n">Credentials</span> <span class="n">cache</span><span class="p">:</span> <span class="n">FILE</span><span class="p">:</span><span class="o">/</span><span class="n">tmp</span><span class="o">/</span><span class="n">krb5cc_0</span>
<span class="n">Principal</span><span class="p">:</span> <span class="n">host</span><span class="o">/</span><span class="n">client</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">org</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">ORG</span>
<span class="n">Issued</span> <span class="n">Expires</span> <span class="n">Principal</span>
<span class="n">Feb</span> <span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">02</span> <span class="n">Feb</span> <span class="mi">22</span> <span class="mi">21</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">01</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">ORG</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">ORG</span>
<span class="n">Feb</span> <span class="mi">22</span> <span class="mi">11</span><span class="p">:</span><span class="mi">24</span><span class="p">:</span><span class="mi">39</span> <span class="n">Feb</span> <span class="mi">22</span> <span class="mi">21</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">01</span> <span class="n">ldap</span><span class="o">/</span><span class="n">ldap</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">org</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">ORG</span>
</pre></div>
</div>
<p>If not, then a network capture utility, such as wireshark, offers a good way to show you which service principal your client is requesting, and what errors are being returned by the server.</p>
<p>If you wish to also view the interaction with the LDAP server with a capture utility, you will need to negotiate a SASL layer without encryption. You can specify <code class="docutils literal"><span class="pre">-O</span> <span class="pre">maxssf=1</span></code> in your client side command (ldapwhoami, ldapsearch etc.), e.g.:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">client</span><span class="p">:</span><span class="o">~</span><span class="c1"># ldapsearch -LLL -Y GSSAPI -H ldap://ldap.example.org -O maxssf=1 -s "base" -b "" supportedSASLMechanisms</span>
</pre></div>
</div>
<p>You might find it easier to specify defaults on your client system, to keep your commands shorter. See the man page for ldap.conf for details. You can specify the default server in your ldap.conf file:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">URI</span> <span class="n">ldap</span><span class="p">:</span><span class="o">//</span><span class="n">ldap</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">org</span>
</pre></div>
</div>
<p>And you can specify the default mechanism in ~/.ldaprc (in your home directory):</p>
<blockquote>
<div>ASL_MECH GSSAPI</div></blockquote>
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