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|
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<title>mod_auth_form - Apache HTTP Server Version 2.4</title>
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<div id="page-content">
<div id="preamble"><h1>Apache Module mod_auth_form</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_auth_form.html" title="English"> en </a> |
<a href="../fr/mod/mod_auth_form.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Form authentication</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>auth_form_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_auth_form.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
<h3>Summary</h3>
<div class="warning"><h3>Warning</h3>
<p>Form authentication depends on the <code class="module"><a href="../mod/mod_session.html">mod_session</a></code>
modules, and these modules make use of HTTP cookies, and as such can fall
victim to Cross Site Scripting attacks, or expose potentially private
information to clients. Please ensure that the relevant risks have
been taken into account before enabling the session functionality on
your server.</p>
</div>
<p>This module allows the use of an HTML login form to restrict access
by looking up users in the given providers. HTML forms require
significantly more configuration than the alternatives, however an
HTML login form can provide a much friendlier experience for end users.
</p>
<p>HTTP basic authentication is provided by
<code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code>, and HTTP digest authentication is
provided by <code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code>. This module should
be combined with at least one authentication module
such as <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code> and one authorization
module such as <code class="module"><a href="../mod/mod_authz_user.html">mod_authz_user</a></code>.</p>
<p>Once the user has been successfully authenticated, the user's login
details will be stored in a session provided by <code class="module"><a href="../mod/mod_session.html">mod_session</a></code>.
</p>
</div>
<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#basicconfig">Basic Configuration</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#standalone">Standalone Login</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#inline">Inline Login</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#inlinepreservebody">Inline Login with Body Preservation</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#loggingout">Logging Out</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#urlencoding">Usernames and Passwords</a></li>
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#authformauthoritative">AuthFormAuthoritative</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformbody">AuthFormBody</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformdisablenostore">AuthFormDisableNoStore</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformfakebasicauth">AuthFormFakeBasicAuth</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformlocation">AuthFormLocation</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformloginrequiredlocation">AuthFormLoginRequiredLocation</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformloginsuccesslocation">AuthFormLoginSuccessLocation</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformlogoutlocation">AuthFormLogoutLocation</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformmethod">AuthFormMethod</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformmimetype">AuthFormMimetype</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformpassword">AuthFormPassword</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformprovider">AuthFormProvider</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformsitepassphrase">AuthFormSitePassphrase</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformsize">AuthFormSize</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authformusername">AuthFormUsername</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_auth_form">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_auth_form">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_session.html">mod_session</a></code></li>
<li><code class="directive"><a href="../mod/mod_authn_core.html#authname">AuthName</a></code></li>
<li><code class="directive"><a href="../mod/mod_authn_core.html#authtype">AuthType</a></code></li>
<li><code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code></li>
<li><a href="../howto/auth.html">Authentication howto</a></li>
<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="basicconfig" id="basicconfig">Basic Configuration</a></h2>
<p>To protect a particular URL with <code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code>, you need to
decide where you will store your <var>session</var>, and you will need to
decide what method you will use to authenticate. In this simple example, the
login details will be stored in a session based on
<code class="module"><a href="../mod/mod_session_cookie.html">mod_session_cookie</a></code>, and authentication will be attempted against
a file using <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>. If authentication is unsuccessful,
the user will be redirected to the form login page.</p>
<div class="example"><h3>Basic example</h3><pre class="prettyprint lang-config"><Location "/admin">
AuthFormProvider file
AuthUserFile "conf/passwd"
AuthType form
AuthName "/admin"
AuthFormLoginRequiredLocation "http://example.com/login.html"
Session On
SessionCookieName session path=/
Require valid-user
</Location></pre>
</div>
<p>The directive <code class="directive"><a href="../mod/mod_authn_core.html#authtype">AuthType</a></code> will enable
the <code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> authentication when set to the value <var>form</var>.
The directives <code class="directive"><a href="#authformprovider">AuthFormProvider</a></code> and
<code class="directive"><a href="../mod/mod_authn_file.html#authuserfile">AuthUserFile</a></code> specify that usernames
and passwords should be checked against the chosen file.</p>
<p>The directives <code class="directive"><a href="../mod/mod_session.html#session">Session</a></code> and
<code class="directive"><a href="../mod/mod_session_cookie.html#sessioncookiename">SessionCookieName</a></code>
session stored within an HTTP cookie on the browser. For more information
on the different options for configuring a session, read the documentation for
<code class="module"><a href="../mod/mod_session.html">mod_session</a></code>.</p>
<p>You can optionally add a
<code class="directive"><a href="../mod/mod_session_crypto.html#sessioncryptopassphrase">SessionCryptoPassphrase</a></code> to
create an encrypted session cookie. This required the additional
module <code class="module"><a href="../mod/mod_session_crypto.html">mod_session_crypto</a></code> be loaded.</p>
<p>In the simple example above, a URL has been protected by
<code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code>, but the user has yet to be given an opportunity to
enter their username and password. Options for doing so include providing a
dedicated standalone login page for this purpose, or for providing the login
page inline.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="standalone" id="standalone">Standalone Login</a></h2>
<p>The login form can be hosted as a standalone page, or can be provided inline on
the same page.</p>
<p>When configuring the login as a standalone page, unsuccessful authentication
attempts should be redirected to a login form created by the website for this purpose,
using the <code class="directive"><a href="#authformloginrequiredlocation">AuthFormLoginRequiredLocation</a></code>
directive. Typically this login page will contain an HTML form, asking the user to
provide their usename and password.</p>
<div class="example"><h3>Example login form</h3><pre class="prettyprint lang-html"><form method="POST" action="/dologin.html">
Username: <input type="text" name="httpd_username" value="" />
Password: <input type="password" name="httpd_password" value="" />
<input type="submit" name="login" value="Login" />
</form></pre>
</div>
<p>The part that does the actual login is handled by the <var>form-login-handler</var>.
The action of the form should point at this handler, which is configured within
Apache httpd as follows:</p>
<div class="example"><h3>Form login handler example</h3><pre class="prettyprint lang-config"><Location "/dologin.html">
SetHandler form-login-handler
AuthFormLoginRequiredLocation "http://example.com/login.html"
AuthFormLoginSuccessLocation "http://example.com/admin/index.html"
AuthFormProvider file
AuthUserFile "conf/passwd"
AuthType form
AuthName /admin
Session On
SessionCookieName session path=/
</Location></pre>
</div>
<p>The URLs specified by the
<code class="directive"><a href="#authformloginrequiredlocation">AuthFormLoginRequiredLocation</a></code> directive will typically
point to a page explaining to the user that their login attempt was unsuccessful, and they
should try again. The <code class="directive"><a href="#authformloginsuccesslocation">AuthFormLoginSuccessLocation</a></code>
directive specifies the URL the user should be redirected to upon successful login.</p>
<p>Alternatively, the URL to redirect the user to on success can be embedded within the login
form, as in the example below. As a result, the same <var>form-login-handler</var> can be
reused for different areas of a website.</p>
<div class="example"><h3>Example login form with location</h3><pre class="prettyprint lang-html"><form method="POST" action="/dologin.html">
Username: <input type="text" name="httpd_username" value="" />
Password: <input type="password" name="httpd_password" value="" />
<input type="submit" name="login" value="Login" />
<input type="hidden" name="httpd_location" value="http://example.com/success.html" />
</form></pre>
</div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="inline" id="inline">Inline Login</a></h2>
<div class="warning"><h3>Warning</h3>
<p>A risk exists that under certain circumstances, the login form configured
using inline login may be submitted more than once, revealing login credentials to
the application running underneath. The administrator must ensure that the underlying
application is properly secured to prevent abuse. If in doubt, use the
standalone login configuration.</p>
</div>
<p>As an alternative to having a dedicated login page for a website, it is possible to
configure <code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> to authenticate users inline, without being
redirected to another page. This allows the state of the current page to be preserved
during the login attempt. This can be useful in a situation where a time limited
session is in force, and the session times out in the middle of the user request. The
user can be re-authenticated in place, and they can continue where they left off.</p>
<p>If a non-authenticated user attempts to access a page protected by
<code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> that isn't configured with a
<code class="directive"><a href="#authformloginrequiredlocation">AuthFormLoginRequiredLocation</a></code> directive,
a <var>HTTP_UNAUTHORIZED</var> status code is returned to the browser indicating to the user
that they are not authorized to view the page.</p>
<p>To configure inline authentication, the administrator overrides the error document
returned by the <var>HTTP_UNAUTHORIZED</var> status code with a custom error document
containing the login form, as follows:</p>
<div class="example"><h3>Basic inline example</h3><pre class="prettyprint lang-config">AuthFormProvider file
ErrorDocument 401 "/login.shtml"
AuthUserFile "conf/passwd"
AuthType form
AuthName realm
AuthFormLoginRequiredLocation "http://example.com/login.html"
Session On
SessionCookieName session path=/</pre>
</div>
<p>The error document page should contain a login form with an empty action property,
as per the example below. This has the effect of submitting the form to
the original protected URL, without the page having to know what that
URL is.</p>
<div class="example"><h3>Example inline login form</h3><pre class="prettyprint lang-html"><form method="POST" <strong>action=""</strong>>
Username: <input type="text" name="httpd_username" value="" />
Password: <input type="password" name="httpd_password" value="" />
<input type="submit" name="login" value="Login" />
</form></pre>
</div>
<p>When the end user has filled in their login details, the form will make
an HTTP POST request to the original password protected URL.
<code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> will intercept this POST request, and if
HTML fields are found present for the username and password, the user
will be logged in, and the original password protected URL will be returned
to the user as a GET request.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="inlinepreservebody" id="inlinepreservebody">Inline Login with Body Preservation</a></h2>
<p>A limitation of the inline login technique described above is that should an
HTML form POST have resulted in the request to authenticate or
reauthenticate, the
contents of the original form posted by the browser will be lost. Depending on
the function of the website, this could present significant inconvenience for the
end user.</p>
<p><code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> addresses this by allowing the method and body
of the original request to be embedded in the login form. If authentication
is successful, the original method and body will be retried by Apache httpd, preserving
the state of the original request.</p>
<p>To enable body preservation, add three additional fields to the login form as
per the example below.</p>
<div class="example"><h3>Example with body preservation</h3><pre class="prettyprint lang-html"><form method="POST" action="">
Username: <input type="text" name="httpd_username" value="" />
Password: <input type="password" name="httpd_password" value="" />
<input type="submit" name="login" value="Login" />
<br /> <strong><input type="hidden" name="httpd_method" value="POST" />
<input type="hidden" name="httpd_mimetype" value="application/x-www-form-urlencoded" />
<input type="hidden" name="httpd_body" value="name1=value1&name2=value2" /></strong><br />
</form></pre>
</div>
<p>How the method, mimetype and body of the original request are embedded within the
login form will depend on the platform and technology being used within the website.
</p>
<p>One option is to use the <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> module along with the
<code class="directive"><a href="../mod/mod_request.html#keptbodysize">KeptBodySize</a></code> directive, along with a suitable
CGI script to embed the variables in the form.</p>
<p>Another option is to render the login form using a CGI script or other dynamic
technology.</p>
<div class="example"><h3>CGI example</h3><pre class="prettyprint lang-config"> AuthFormProvider file
ErrorDocument 401 "/cgi-bin/login.cgi"
...</pre>
</div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="loggingout" id="loggingout">Logging Out</a></h2>
<p>To enable a user to log out of a particular session, configure a page to
be handled by the <var>form-logout-handler</var>. Any attempt to access this
URL will cause the username and password to be removed from the current
session, effectively logging the user out.</p>
<p>By setting the
<code class="directive"><a href="#authformlogoutlocation">AuthFormLogoutLocation</a></code> directive,
a URL can be specified that the browser will be redirected to on successful
logout. This URL might explain to the user that they have been logged out, and
give the user the option to log in again.</p>
<div class="example"><h3>Basic logout example</h3><pre class="prettyprint lang-config">SetHandler form-logout-handler
AuthName realm
AuthFormLogoutLocation "http://example.com/loggedout.html"
Session On
SessionCookieName session path=/</pre>
</div>
<p>Note that logging a user out does not delete the session; it merely removes
the username and password from the session. If this results in an empty session,
the net effect will be the removal of that session, but this is not
guaranteed. If you want to guarantee the removal of a session, set the
<code class="directive"><a href="../mod/mod_session.html#sessionmaxage">SessionMaxAge</a></code> directive to a small
value, like 1 (setting the directive to zero would mean no session age limit).
</p>
<div class="example"><h3>Basic session expiry example</h3><pre class="prettyprint lang-config">SetHandler form-logout-handler
AuthFormLogoutLocation "http://example.com/loggedout.html"
Session On
SessionMaxAge 1
SessionCookieName session path=/</pre>
</div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="urlencoding" id="urlencoding">Usernames and Passwords</a></h2>
<p>Note that form submission involves URLEncoding the form data:
in this case the username and password. You should therefore
pick usernames and passwords that avoid characters that are
URLencoded in form submission, or you may get unexpected results.</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="AuthFormAuthoritative" id="AuthFormAuthoritative">AuthFormAuthoritative</a> <a name="authformauthoritative" id="authformauthoritative">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets whether authorization and authentication are passed to
lower level modules</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormAuthoritative On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthFormAuthoritative On</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
</table>
<p>Normally, each authorization module listed in <code class="directive"><a href="#authformprovider">AuthFormProvider</a></code> will attempt
to verify the user, and if the user is not found in any provider,
access will be denied. Setting the
<code class="directive">AuthFormAuthoritative</code> directive explicitly
to <code>Off</code> allows for both authentication and
authorization to be passed on to other non-provider-based modules
if there is <strong>no userID</strong> or <strong>rule</strong>
matching the supplied userID. This should only be necessary when
combining <code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> with third-party modules
that are not configured with the <code class="directive"><a href="#authformprovider">AuthFormProvider</a></code>
directive. When using such modules, the order of processing
is determined in the modules' source code and is not configurable.</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="AuthFormBody" id="AuthFormBody">AuthFormBody</a> <a name="authformbody" id="authformbody">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The name of a form field carrying the body of the request to attempt on successful login</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormBody <var>fieldname</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>httpd_body</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformmethod">AuthFormMethod</a></code> directive specifies
the name of an HTML field which, if present, will contain the method of the request to
to submit should login be successful.</p>
<p>By populating the form with fields described by
<code class="directive"><a href="#authformmethod">AuthFormMethod</a></code>,
<code class="directive"><a href="#authformmimetype">AuthFormMimetype</a></code> and
<code class="directive"><a href="#authformbody">AuthFormBody</a></code>, a website can retry
a request that may have been interrupted by the login screen, or by a session
timeout.</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="AuthFormDisableNoStore" id="AuthFormDisableNoStore">AuthFormDisableNoStore</a> <a name="authformdisablenostore" id="authformdisablenostore">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Disable the CacheControl no-store header on the login page</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormDisableNoStore <var>On|Off</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthFormDisableNoStore 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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformdisablenostore">AuthFormDisableNoStore</a></code> flag
disables the sending of a <code>Cache-Control no-store</code> header with the
error 401 page returned when the user is not yet logged in. The purpose of the header
is to make it difficult for an <code>ecmascript</code> application to attempt to resubmit the
login form, and reveal the username and password to the backend application. Disable
at your own risk.</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="AuthFormFakeBasicAuth" id="AuthFormFakeBasicAuth">AuthFormFakeBasicAuth</a> <a name="authformfakebasicauth" id="authformfakebasicauth">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Fake a Basic Authentication header</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormFakeBasicAuth <var>On|Off</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthFormFakeBasicAuth 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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformfakebasicauth">AuthFormFakeBasicAuth</a></code> flag
determines whether a <code>Basic Authentication</code> header will be added to
the request headers. This can be used to expose the username and password to
an underlying application, without the underlying application having to be aware
of how the login was achieved.</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="AuthFormLocation" id="AuthFormLocation">AuthFormLocation</a> <a name="authformlocation" id="authformlocation">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The name of a form field carrying a URL to redirect to on successful login</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormLocation <var>fieldname</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>httpd_location</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformlocation">AuthFormLocation</a></code> directive specifies
the name of an HTML field which, if present, will contain a URL to redirect the browser to
should login be successful.</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="AuthFormLoginRequiredLocation" id="AuthFormLoginRequiredLocation">AuthFormLoginRequiredLocation</a> <a name="authformloginrequiredlocation" id="authformloginrequiredlocation">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The URL of the page to be redirected to should login be required</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormLoginRequiredLocation <var>url</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later. The use of the expression
parser has been added in 2.4.4.</td></tr>
</table>
<p>The <code class="directive"><a href="#authformloginrequiredlocation">AuthFormLoginRequiredLocation</a></code> directive
specifies the URL to redirect to should the user not be authorised to view a page. The value
is parsed using the <a href="../expr.html">ap_expr</a> parser before being sent to the client.
By default, if a user is not authorised to view a page, the HTTP response code
<code>HTTP_UNAUTHORIZED</code> will be returned with the page specified by the
<code class="directive"><a href="../mod/core.html#errordocument">ErrorDocument</a></code> directive. This directive overrides this
default.</p>
<p>Use this directive if you have a dedicated login page to redirect users to.</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="AuthFormLoginSuccessLocation" id="AuthFormLoginSuccessLocation">AuthFormLoginSuccessLocation</a> <a name="authformloginsuccesslocation" id="authformloginsuccesslocation">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The URL of the page to be redirected to should login be successful</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormLoginSuccessLocation <var>url</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later. The use of the expression
parser has been added in 2.4.4.</td></tr>
</table>
<p>The <code class="directive"><a href="#authformloginsuccesslocation">AuthFormLoginSuccessLocation</a></code> directive
specifies the URL to redirect to should the user have logged in successfully. The value is
parsed using the <a href="../expr.html">ap_expr</a> parser before being sent to the client.
This directive can be overridden if a form field has been defined containing another URL
using the <code class="directive"><a href="#authformlocation">AuthFormLocation</a></code> directive.</p>
<p>Use this directive if you have a dedicated login URL, and you have not embedded the
destination page in the login form.</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="AuthFormLogoutLocation" id="AuthFormLogoutLocation">AuthFormLogoutLocation</a> <a name="authformlogoutlocation" id="authformlogoutlocation">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The URL to redirect to after a user has logged out</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormLogoutLocation <var>uri</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later. The use of the expression
parser has been added in 2.4.4.</td></tr>
</table>
<p>The <code class="directive"><a href="#authformlogoutlocation">AuthFormLogoutLocation</a></code> directive
specifies the URL of a page on the server to redirect to should the user attempt to log
out. The value is parsed using the <a href="../expr.html">ap_expr</a> parser before
being sent to the client.</p>
<p>When a URI is accessed that is served by the handler <code>form-logout-handler</code>,
the page specified by this directive will be shown to the end user. For example:</p>
<div class="example"><h3>Example</h3><pre class="prettyprint lang-config"><Location "/logout">
SetHandler form-logout-handler
AuthFormLogoutLocation "http://example.com/loggedout.html"
Session on
#...
</Location></pre>
</div>
<p>An attempt to access the URI <var>/logout/</var> will result in the user being logged
out, and the page <var>/loggedout.html</var> will be displayed. Make sure that the page
<var>loggedout.html</var> is not password protected, otherwise the page will not be
displayed.</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="AuthFormMethod" id="AuthFormMethod">AuthFormMethod</a> <a name="authformmethod" id="authformmethod">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The name of a form field carrying the method of the request to attempt on successful login</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormMethod <var>fieldname</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>httpd_method</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformmethod">AuthFormMethod</a></code> directive specifies
the name of an HTML field which, if present, will contain the method of the request to
to submit should login be successful.</p>
<p>By populating the form with fields described by
<code class="directive"><a href="#authformmethod">AuthFormMethod</a></code>,
<code class="directive"><a href="#authformmimetype">AuthFormMimetype</a></code> and
<code class="directive"><a href="#authformbody">AuthFormBody</a></code>, a website can retry
a request that may have been interrupted by the login screen, or by a session
timeout.</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="AuthFormMimetype" id="AuthFormMimetype">AuthFormMimetype</a> <a name="authformmimetype" id="authformmimetype">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The name of a form field carrying the mimetype of the body of the request to attempt on successful login</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormMimetype <var>fieldname</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>httpd_mimetype</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformmethod">AuthFormMethod</a></code> directive specifies
the name of an HTML field which, if present, will contain the
mimetype of the request to submit should login be successful.</p>
<p>By populating the form with fields described by
<code class="directive"><a href="#authformmethod">AuthFormMethod</a></code>,
<code class="directive"><a href="#authformmimetype">AuthFormMimetype</a></code> and
<code class="directive"><a href="#authformbody">AuthFormBody</a></code>, a website can retry
a request that may have been interrupted by the login screen, or by a session
timeout.</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="AuthFormPassword" id="AuthFormPassword">AuthFormPassword</a> <a name="authformpassword" id="authformpassword">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The name of a form field carrying the login password</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormPassword <var>fieldname</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>httpd_password</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformpassword">AuthFormPassword</a></code> directive specifies
the name of an HTML field which, if present, will contain the password to be used to log
in.</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="AuthFormProvider" id="AuthFormProvider">AuthFormProvider</a> <a name="authformprovider" id="authformprovider">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the authentication provider(s) for this location</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormProvider <var>provider-name</var>
[<var>provider-name</var>] ...</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthFormProvider file</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
</table>
<p>The <code class="directive">AuthFormProvider</code> directive sets
which provider is used to authenticate the users for this location.
The default <code>file</code> provider is implemented
by the <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code> module. Make sure
that the chosen provider module is present in the server.</p>
<div class="example"><h3>Example</h3><pre class="prettyprint lang-config"><Location "/secure">
AuthType form
AuthName "private area"
AuthFormProvider dbm
AuthDBMType SDBM
AuthDBMUserFile "/www/etc/dbmpasswd"
Require valid-user
#...
</Location></pre>
</div>
<p>Providers are implemented by <code class="module"><a href="../mod/mod_authn_dbm.html">mod_authn_dbm</a></code>,
<code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>, <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code>,
<code class="module"><a href="../mod/mod_authnz_ldap.html">mod_authnz_ldap</a></code> and <code class="module"><a href="../mod/mod_authn_socache.html">mod_authn_socache</a></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="AuthFormSitePassphrase" id="AuthFormSitePassphrase">AuthFormSitePassphrase</a> <a name="authformsitepassphrase" id="authformsitepassphrase">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Bypass authentication checks for high traffic sites</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormSitePassphrase <var>secret</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformsitepassphrase">AuthFormSitePassphrase</a></code> directive
specifies a passphrase which, if present in the user session, causes Apache httpd to
bypass authentication checks for the given URL. It can be used on high traffic websites
to reduce the load induced on authentication infrastructure.</p>
<p>The passphrase can be inserted into a user session by adding this directive to the
configuration for the <var>form-login-handler</var>. The <var>form-login-handler</var>
itself will always run the authentication checks, regardless of whether a passphrase
is specified or not.</p>
<div class="warning"><h3>Warning</h3>
<p>If the session is exposed to the user through the use of
<code class="module"><a href="../mod/mod_session_cookie.html">mod_session_cookie</a></code>, and the session is not protected with
<code class="module"><a href="../mod/mod_session_crypto.html">mod_session_crypto</a></code>, the passphrase is open to potential exposure
through a dictionary attack. Regardless of how the session is configured,
ensure that this directive is not used within URL spaces where private user data
could be exposed, or sensitive transactions can be conducted. Use at own risk.</p>
</div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthFormSize" id="AuthFormSize">AuthFormSize</a> <a name="authformsize" id="authformsize">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The largest size of the form in bytes that will be parsed for the login details</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormSize <var>size</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>8192</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformsize">AuthFormSize</a></code> directive specifies
the maximum size of the body of the request that will be parsed to find the login form.</p>
<p>If a login request arrives that exceeds this size, the whole request will be aborted
with the HTTP response code <code>HTTP_REQUEST_TOO_LARGE</code>.</p>
<p>If you have populated the form with fields described by
<code class="directive"><a href="#authformmethod">AuthFormMethod</a></code>,
<code class="directive"><a href="#authformmimetype">AuthFormMimetype</a></code> and
<code class="directive"><a href="#authformbody">AuthFormBody</a></code>, you probably want to set this
field to a similar size as the <code class="directive"><a href="../mod/mod_request.html#keptbodysize">KeptBodySize</a></code>
directive.</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="AuthFormUsername" id="AuthFormUsername">AuthFormUsername</a> <a name="authformusername" id="authformusername">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The name of a form field carrying the login username</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthFormUsername <var>fieldname</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>httpd_username</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>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_form</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.3.0 and later</td></tr>
</table>
<p>The <code class="directive"><a href="#authformusername">AuthFormUsername</a></code> directive specifies
the name of an HTML field which, if present, will contain the username to be used to log
in.</p>
</div>
</div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/mod/mod_auth_form.html" title="English"> en </a> |
<a href="../fr/mod/mod_auth_form.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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