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<div id="preamble"><h1>Apache Module mod_authz_dbd</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authz_dbd.html" title="English">&nbsp;en&nbsp;</a> |
<a href="../fr/mod/mod_authz_dbd.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Group Authorization and Login using SQL</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>authz_dbd_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_authz_dbd.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4 and later</td></tr></table>
<h3>Summary</h3>

    <p>This module provides authorization capabilities so that
       authenticated users can be allowed or denied access to portions
       of the web site by group membership.  Similar functionality is
       provided by <code class="module"><a href="../mod/mod_authz_groupfile.html">mod_authz_groupfile</a></code> and
       <code class="module"><a href="../mod/mod_authz_dbm.html">mod_authz_dbm</a></code>, with the exception that
       this module queries a SQL database to determine whether a
       user is a member of a group.</p>
    <p>This module can also provide database-backed user login/logout
       capabilities.  These are likely to be of most value when used
       in conjunction with <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</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>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#requiredirectives">The Require Directives</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#login">Database Login</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#client">Client Login integration</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#example">Configuration example</a></li>
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#authzdbdlogintoreferer">AuthzDBDLoginToReferer</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authzdbdquery">AuthzDBDQuery</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authzdbdredirectquery">AuthzDBDRedirectQuery</a></li>
</ul>
<h3>See also</h3>
<ul class="seealso">
<li><code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code></li>
<li>
  <code class="directive"><a href="../mod/mod_authn_dbd.html#authdbduserpwquery">AuthDBDUserPWQuery</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><ul class="seealso"><li><a href="#comments_section">Comments</a></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="requiredirectives" id="requiredirectives">The Require Directives</a></h2>

    <p>Apache's <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code>
    directives are used during the authorization phase to ensure that
    a user is allowed to access a resource.  mod_authz_dbd extends the
    authorization types with <code>dbd-group</code>, <code>dbd-login</code> and
    <code>dbd-logout</code>.</p>

    <p>Since v2.4.8, <a href="../expr.html">expressions</a> are supported
    within the DBD require directives.</p>

<h3><a name="reqgroup" id="reqgroup">Require dbd-group</a></h3>

    <p>This directive specifies group membership that is required for the
    user to gain access.</p>

    <pre class="prettyprint lang-config">      Require dbd-group team
      AuthzDBDQuery "SELECT group FROM authz WHERE user = %s"</pre>




<h3><a name="reqlogin" id="reqlogin">Require dbd-login</a></h3>

    <p>This directive specifies a query to be run indicating the user
    has logged in.</p>

    <pre class="prettyprint lang-config">      Require dbd-login
      AuthzDBDQuery "UPDATE authn SET login = 'true' WHERE user = %s"</pre>




<h3><a name="reqlogout" id="reqlogout">Require dbd-logout</a></h3>

    <p>This directive specifies a query to be run indicating the user
    has logged out.</p>

    <pre class="prettyprint lang-config">      Require dbd-logout
      AuthzDBDQuery "UPDATE authn SET login = 'false' WHERE user = %s"</pre>




</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="login" id="login">Database Login</a></h2>

<p>
In addition to the standard authorization function of checking group
membership, this module can also provide server-side user session
management via database-backed login/logout capabilities.
Specifically, it can update a user's session status in the database
whenever the user visits designated URLs (subject of course to users
supplying the necessary credentials).</p>
<p>This works by defining two special
<code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> types:
<code>Require dbd-login</code> and <code>Require dbd-logout</code>.
For usage details, see the configuration example below.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="client" id="client">Client Login integration</a></h2>

<p>Some administrators may wish to implement client-side session
management that works in concert with the server-side login/logout
capabilities offered by this module, for example, by setting or unsetting
an HTTP cookie or other such token when a user logs in or out.</p>
<p>To support such integration, <code class="module"><a href="../mod/mod_authz_dbd.html">mod_authz_dbd</a></code> exports an
optional hook that will be run whenever a user's status is updated in
the database.  Other session management modules can then use the hook
to implement functions that start and end client-side sessions.</p>
</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>

<pre class="prettyprint lang-config"># mod_dbd configuration
DBDriver pgsql
DBDParams "dbname=apacheauth user=apache pass=xxxxxx"

DBDMin  4
DBDKeep 8
DBDMax  20
DBDExptime 300

&lt;Directory "/usr/www/my.site/team-private/"&gt;
  # mod_authn_core and mod_auth_basic configuration
  # for mod_authn_dbd
  AuthType Basic
  AuthName Team
  AuthBasicProvider dbd

  # mod_authn_dbd SQL query to authenticate a logged-in user
  AuthDBDUserPWQuery \
    "SELECT password FROM authn WHERE user = %s AND login = 'true'"

  # mod_authz_core configuration for mod_authz_dbd
  Require dbd-group team

  # mod_authz_dbd configuration
  AuthzDBDQuery "SELECT group FROM authz WHERE user = %s"

  # when a user fails to be authenticated or authorized,
  # invite them to login; this page should provide a link
  # to /team-private/login.html
  ErrorDocument 401 "/login-info.html"

  &lt;Files "login.html"&gt;
    # don't require user to already be logged in!
    AuthDBDUserPWQuery "SELECT password FROM authn WHERE user = %s"

    # dbd-login action executes a statement to log user in
    Require dbd-login
    AuthzDBDQuery "UPDATE authn SET login = 'true' WHERE user = %s"

    # return user to referring page (if any) after
    # successful login
    AuthzDBDLoginToReferer On
  &lt;/Files&gt;

  &lt;Files "logout.html"&gt;
    # dbd-logout action executes a statement to log user out
    Require dbd-logout
    AuthzDBDQuery "UPDATE authn SET login = 'false' WHERE user = %s"
  &lt;/Files&gt;
&lt;/Directory&gt;</pre>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthzDBDLoginToReferer" id="AuthzDBDLoginToReferer">AuthzDBDLoginToReferer</a> <a name="authzdbdlogintoreferer" id="authzdbdlogintoreferer">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines whether to redirect the Client to the Referring
page on successful login or logout if a <code>Referer</code> request
header is present</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthzDBDLoginToReferer On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthzDBDLoginToReferer Off</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_authz_dbd</td></tr>
</table>
    <p>In conjunction with <code>Require dbd-login</code> or
    <code>Require dbd-logout</code>, this provides the option to
    redirect the client back to the Referring page (the URL in
    the <code>Referer</code> HTTP request header, if present).
    When there is no <code>Referer</code> header,
    <code>AuthzDBDLoginToReferer On</code> will be ignored.</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="AuthzDBDQuery" id="AuthzDBDQuery">AuthzDBDQuery</a> <a name="authzdbdquery" id="authzdbdquery">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify the SQL Query for the required operation</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthzDBDQuery <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_authz_dbd</td></tr>
</table>
    <p>The <code class="directive">AuthzDBDQuery</code> specifies an SQL
    query to run.  The purpose of the query depends on the
    <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> directive in
    effect.</p>
    <ul>
    <li>When used with a <code>Require dbd-group</code> directive,
    it specifies a query to look up groups for the current user.  This is
    the standard functionality of other authorization modules such as
    <code class="module"><a href="../mod/mod_authz_groupfile.html">mod_authz_groupfile</a></code> and <code class="module"><a href="../mod/mod_authz_dbm.html">mod_authz_dbm</a></code>.
    The first column value of each row returned by the query statement
    should be a string containing a group name.  Zero, one, or more rows
    may be returned.
    <pre class="prettyprint lang-config">Require dbd-group
AuthzDBDQuery "SELECT group FROM groups WHERE user = %s"</pre>

    </li>
    <li>When used with a <code>Require dbd-login</code> or
    <code>Require dbd-logout</code> directive, it will never deny access,
    but will instead execute a SQL statement designed to log the user
    in or out.  The user must already be authenticated with
    <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code>.
    <pre class="prettyprint lang-config">Require dbd-login
AuthzDBDQuery "UPDATE authn SET login = 'true' WHERE user = %s"</pre>

    </li>
    </ul>
    <p>In all cases, 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>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthzDBDRedirectQuery" id="AuthzDBDRedirectQuery">AuthzDBDRedirectQuery</a> <a name="authzdbdredirectquery" id="authzdbdredirectquery">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify a query to look up a login page for the user</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthzDBDRedirectQuery <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_authz_dbd</td></tr>
</table>
    <p>Specifies an optional SQL query to use after successful login
    (or logout) to redirect the user to a URL, which may be
    specific to the 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>
    <pre class="prettyprint lang-config">AuthzDBDRedirectQuery "SELECT userpage FROM userpages WHERE user = %s"</pre>

    <p>The first column value of the first row returned by the query
    statement should be a string containing a URL to which to redirect
    the client.  Subsequent rows will be ignored.  If no rows are returned,
    the client will not be redirected.</p>
    <p>Note that <code class="directive">AuthzDBDLoginToReferer</code> takes
    precedence if both are set.</p>

</div>
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