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<div id="preamble"><h1>Apache Module mod_authn_dbd</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authn_dbd.html" title="English">&nbsp;en&nbsp;</a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>User authentication using an SQL database</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>authn_dbd_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_authn_dbd.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.1 and later</td></tr></table>
<h3>Summary</h3>

    <p>This module provides authentication front-ends such as
    <code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code> and <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code>
    to authenticate users by looking up users in SQL tables.
    Similar functionality is provided by, for example,
    <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>.</p>
    <p>This module relies on <code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> to specify
    the backend database driver and connection parameters, and
    manage the database connections.</p>

    <p>When using <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code> or
    <code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code>, this module is invoked via the
    <code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code> or
    <code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code>
    with the <code>dbd</code> value.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#authdbduserpwquery">AuthDBDUserPWQuery</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authdbduserrealmquery">AuthDBDUserRealmQuery</a></li>
</ul>
<h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#example">Configuration Example</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#exposed">Exposing Login Information</a></li>
</ul><h3>See also</h3>
<ul class="seealso">
<li><code class="directive"><a href="../mod/core.html#authname">AuthName</a></code></li>
<li><code class="directive"><a href="../mod/core.html#authtype">AuthType</a></code></li>
<li>
  <code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code>
</li>
<li>
  <code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code>
</li>
<li><code class="directive"><a href="../mod/mod_dbd.html#dbdriver">DBDriver</a></code></li>
<li><code class="directive"><a href="../mod/mod_dbd.html#dbdparams">DBDParams</a></code></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="example" id="example">Configuration Example</a></h2>

<p>This simple example shows use of this module in the context of
the Authentication and DBD frameworks.</p>
<div class="example"><pre>
#Database Management

#Use the PostgreSQL driver
<code>DBDriver pgsql</code>

#Connection string: database name and login credentials
<code>DBDParams "dbname=htpasswd user=apache password=xxxxxx"</code>

#Parameters for Connection Pool Management
<code>DBDMin  1
DBDKeep 2
DBDMax  10
DBDExptime 60</code>

#Authentication Section
<code>&lt;Directory /usr/www/myhost/private&gt;</code>

    #mod_auth configuration for authn_dbd
    <code>AuthType Basic
    AuthName "My Server"
    AuthBasicProvider dbd</code>

    #authz configuration
    <code>Require valid-user</code>

    #SQL query to verify a user
    #(note: DBD drivers recognise both stdio-like %s and native syntax)
    <code>AuthDBDUserPWQuery "select password from authn where username = %s"
&lt;/Directory&gt;</code>
</pre></div>
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<div class="section">
<h2><a name="exposed" id="exposed">Exposing Login Information</a></h2>

<p>
Whenever a query is made to the database server, all columns returned by
the query are placed in the environment, using environment variables with
the prefix "AUTHENTICATE_".
</p>
<p>If a database query for example returned the username, full name
and telephone number of a user, a CGI program will have access to
this information without the need to make a second independent database
query to gather this additional information.</p>
<p>This has the potential to dramatically simplify the coding and
configuration required in some web applications.
</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthDBDUserPWQuery" id="AuthDBDUserPWQuery">AuthDBDUserPWQuery</a> <a name="authdbduserpwquery" id="authdbduserpwquery">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SQL query to look up a password for a user</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDBDUserPWQuery <var>query</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_dbd</td></tr>
</table>
    <p>The <code class="directive">AuthDBDUserPWQuery</code> specifies an
    SQL query to look up a password for a specified user.
    The query must take a single string (typically SQL varchar)
    argument (username), and return a single value (encrypted password).
    </p>
    <div class="example"><p><code>
    AuthDBDUserPWQuery "SELECT password FROM authn WHERE username = %s"
    </code></p></div>
    <p>If httpd was built against apr v1.3.0 or higher, any additional
    columns specified in the select statement will be inserted into
    the environment with the name <code>AUTHENTICATE_&lt;COLUMN&gt;</code>.
    </p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthDBDUserRealmQuery" id="AuthDBDUserRealmQuery">AuthDBDUserRealmQuery</a> <a name="authdbduserrealmquery" id="authdbduserrealmquery">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SQL query to look up a password hash for a user and realm.
</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDBDUserRealmQuery <var>query</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_dbd</td></tr>
</table>
    <p>The <code class="directive">AuthDBDUserRealmQuery</code> specifies an
    SQL query to look up a password for a specified user and realm.
    The query must take two string (typically SQL varchar) arguments
    (username and realm), and return a single value (encrypted password).
    </p>
    <div class="example"><p><code>
    AuthDBDUserRealmQuery "SELECT password FROM authn
                              WHERE username = %s AND realm = %s"
    </code></p></div>
    <p>If httpd was built against apr v1.3.0 or higher, any additional
    columns specified in the select statement will be inserted into
    the environment with the name <code>AUTHENTICATE_&lt;COLUMN&gt;</code>.
    </p>


</div>
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