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<title>mod_authn_dbd - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.3</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.3</a> > <a href="./">Modules</a></div>
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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"> en </a></p>
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<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#ModuleIdentifier">Module�Identifier:</a></th><td>authn_dbd_module</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,
<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>
<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="#authdbduserrealmquery">AuthDBDUserRealmQuery</a></li>
</ul>
<h3>Topics</h3>
<ul id="topics">
</ul><h3>See also</h3>
<ul class="seealso">
<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>
</ul></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>
# mod_dbd configuration
DBDriver pgsql
DBDParams "dbname=apacheauth user=apache password=xxxxxx"
DBDMin 4
DBDKeep 8
DBDMax 20
DBDExptime 300
# mod_authn_core and mod_auth_basic configuration
# for mod_authn_dbd
AuthType Basic
AuthName "My Server"
AuthBasicProvider dbd
# mod_authz_core configuration
Require valid-user
# mod_authn_dbd SQL query to authenticate a user
AuthDBDUserPWQuery \
"SELECT password FROM authn WHERE user = %s"
</Directory>
</pre></div>
<div class="section">
<h2><a name="exposed" id="exposed">Exposing Login Information</a></h2>
<p>
If httpd was built against <a class="glossarylink" href="/glossary.html#apr" title="see glossary">APR</a> version 1.3.0
or higher, then whenever a query is made to the database server, all
column values in the first row 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="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>
</table>
<p>The <code class="directive">AuthDBDUserPWQuery</code> specifies an
SQL query to look up a password for a specified user. The user's ID
will be passed as a single string parameter when the SQL query is
executed. It may be referenced within the query statement using
a <code>%s</code> format specifier.</p>
<div class="example"><h3>Example</h3><pre>
AuthDBDUserPWQuery \
"SELECT password FROM authn WHERE user = %s"
</pre></div>
<p>The first column value of the first row returned by the query
statement should be a string containing the encrypted password.
Subsequent rows will be ignored. If no rows are returned, the user
will not be authenticated through <code class="module"><a href="/mod/mod_authn_dbd.html">mod_authn_dbd</a></code>.</p>
<p>If httpd was built against <a class="glossarylink" href="/glossary.html#apr" title="see glossary">APR</a> version 1.3.0
or higher, any additional column values in the first row returned by
the query statement will be stored as environment variables with
names of the form <code>AUTHENTICATE_<var>COLUMN</var></code>.
</p>
</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>
</table>
<p>The <code class="directive">AuthDBDUserRealmQuery</code> specifies an
SQL query to look up a password for a specified user and realm.
The user's ID and the realm, in that order, will be passed as string
parameters when the SQL query is executed. They may be referenced
within the query statement using <code>%s</code> format specifiers.</p>
<div class="example"><h3>Example</h3><pre>
AuthDBDUserRealmQuery \
"SELECT password FROM authn WHERE user = %s AND realm = %s"
</pre></div>
<p>The first column value of the first row returned by the query
statement should be a string containing the encrypted password.
Subsequent rows will be ignored. If no rows are returned, the user
will not be authenticated through <code class="module"><a href="/mod/mod_authn_dbd.html">mod_authn_dbd</a></code>.</p>
<p>If httpd was built against <a class="glossarylink" href="/glossary.html#apr" title="see glossary">APR</a> version 1.3.0
or higher, any additional column values in the first row returned by
the query statement will be stored as environment variables with
names of the form <code>AUTHENTICATE_<var>COLUMN</var></code>.
</p>
</div>
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