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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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<TITLE>Apache module mod_auth_anon.c</TITLE>
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<H1>Module mod_auth_anon</H1>
This module is contained in the <code>mod_auth_anon.c</code> file and
is not compiled in by default. It is only available in Apache 1.1 and
later. It allows "anonymous" user access to authenticated areas.
<h2>Summary</h2>
It does access control in a manner similar to anonymous-ftp sites; i.e.
have a 'magic' user id 'anonymous' and the email address as a password.
These email addresses can be logged.
<p>
Combined with other (database) access control methods, this allows for
effective user tracking and customization according to a user profile
while still keeping the site open for 'unregistered' users. One advantage
of using Auth-based user tracking is that, unlike magic-cookies and
funny URL pre/postfixes, it is completely browser independent and it
allows users to share URLs.
<p>
<a href="#Directives">Directives</a> /
<a href="#Example">Example</a> /
<a href="#CompileTimeOptions">Compile time options</a> /
<a href="#RevisionHistory">RevisionHistory</a> /
<a href="#Person">Person to blame</a> /
<a href="#Sourcecode">Sourcecode</a>
<p>
<h2><a name="Directives">Directives</a></h2>
<ul>
<li><A HREF="#anonymous">Anonymous</A>
<li><A HREF="#LogMail">Anonymous_LogEmail</A>
<li><A HREF="#VerifyEmail">Anonymous_VerifyEmail</A>
<li><A HREF="#NoUser">Anonymous_NoUser</A>
<li><A HREF="#Authoritative">Anonymous_Authoritative</A>
</ul>
<hr>
<A name="anonymous"><h2>Anonymous</h2></a>
<!--%plaintext <?INDEX {\tt Anonymous} directive> -->
<strong>Syntax:</strong> Anonymous <em>user user ...</em><br>
<strong>Default:</strong> none<br>
<strong>Context:</strong> directory, .htaccess<br>
<strong>Override:</strong> AuthConfig<br>
<strong>Status:</strong> Extension<br>
<strong>Module:</strong> mod_auth_anon<p>
A list of one or more 'magic' userIDs which are allowed access
without password verification. The userIDs are space separated.
It is possible to use the ' and " quotes to allow a space in
a userID as well as the \ escape character.
<p>
Please note that the comparison is <b>case-IN-sensitive</b>.
<br>
I strongly suggest that the magic username '<code>anonymous</code>'
is always one of the allowed userIDs.
<p>
Example:<br>
<code>
Anonymous: anonymous "Not Registered" 'I don\'t know'
</code><p>
This would allow the user to enter without password verification
by using the userId's 'anonymous', 'AnonyMous','Not Registered' and
'I Don't Know'.
<hr>
<A name="LogMail"><h2>Anonymous_LogEmail</h2></A>
<strong>Syntax:</strong> Anonymous_LogEmail <em>on | off</em><br>
<strong>Default:</strong> <code>off</code><br>
<strong>Context:</strong> directory, .htaccess<br>
<strong>Override:</strong> AuthConfig<br>
<strong>Status:</strong> Extension<br>
<strong>Module:</strong> mod_auth_anon<p>
When set 'on', the default, the 'password' entered (which hopefully
contains a sensible email address) is logged in the httpd-log file.
<hr>
<A name="VerifyEmail"><h2>Anonymous_VerifyEmail</h2></A>
<strong>Syntax:</strong> Anonymous <em>on | off</em><br>
<strong>Default:</strong> <code>Anonymous_VerifyEmail off</code><br>
<strong>Context:</strong> directory, .htaccess<br>
<strong>Override:</strong> AuthConfig<br>
<strong>Status:</strong> Extension<br>
<strong>Module:</strong> mod_auth_anon<p>
When set 'on' the 'password' entered is
checked for at least one '@' and a '.' to encourage users to enter
valid email addresses (see the above <code>Auth_LogEmail</code>).
<HR>
<A name="NoUser"><h2>Anonymous_NoUser</h2></A>
<strong>Syntax:</strong> Anonymous_NoUser <em>on | off</em><br>
<strong>Default:</strong> <code>Anonymous_NoUser off</code><br>
<strong>Context:</strong> directory, .htaccess<br>
<strong>Override:</strong> AuthConfig<br>
<strong>Status:</strong> Extension<br>
<strong>Module:</strong> mod_auth_anon<p>
When set 'on', users can leave
the userID (and perhaps the password field) empty. This
can be very convenient for MS-Explorer users who can
just hit return or click directly on the OK button; which
seems a natural reaction.
<A name="Authoritative"><h2>Anonymous_Authoritative</h2></A>
<strong>Syntax:</strong> Anonymous_Authoritative <em>on | off</em><br>
<strong>Default:</strong> <code>Anonymous_Authoritative off</code><br>
<strong>Context:</strong> directory, .htaccess<br>
<strong>Override:</strong> AuthConfig<br>
<strong>Status:</strong> Extension<br>
<strong>Module:</strong> mod_auth_anon<p>
When set 'on', there is no
fall-through to other authorization methods. So if a
userID does not match the values specified in the
<code>Anonymous</code> directive, access is denied.
<p>
Be sure you know what you are doing when you decide to switch
it on. And remember that it is the linking order of the modules
(in the Configuration / Make file) which details the order
in which the Authorization modules are queried.
<hr><a name="Example"><h2>Example</h2></a>
The example below (when combined with the Auth directives
of a htpasswd-file based (or GDM, mSQL etc) base access
control system allows users in as 'guests' with the
following properties:
<ul>
<li>
It insists that the user enters a userId. (<code>Anonymous_NoUserId</code>)
<li>
It insists that the user enters a password. (<code>Anonymous_MustGiveEmail</code>)
<li>
The password entered must be a valid email address, ie. contain at least one '@' and a '.'.
(<code>Anonymous_VerifyEmail</code>)
<li>
The userID must be one of <code>anonymous guest www test welcome</code>
and comparison is <b>not</b> case sensitive.
<code><directory /web/docs/public></code>
<li>
And the Email addresses entered in the passswd field are logged to
the httpd-log file
(<code>Anonymous_LogEmail</code>)
</ul>
<p>
Excerpt of access.conf:
<dl>
<dt><code>
Anonymous anonymous guest www test welcome<p>
Anonymous_MustGiveEmail on<br>
Anonymous_VerifyEmail on<br>
Anonymous_NoUserId off<br>
Anonymous_LogEmail on<br>
<p>
AuthName Use 'anonymous' & Email address for guest entry<br>
AuthType basic<p>
</code></dt>
<dd>
Normal Apache/NCSA tokens for access control
<p>
<code><limit get post head></code><br>
<code>order deny,allow </code><br>
<code>allow from all </code><br>
<p>
<code>require valid-user </code><br>
<code><limit> </code><br>
</dd>
</dl>
<hr><h2><a name="CompileTimeOptions">Compile Time Options</a></h2>
Currently there are no Compile options.
<hr><h2><a name="RevisionHistory">Revision History</a></h2>
This version: 23 Nov 1995, 24 Feb 1996, 16 May 1996.
<dl>
<dt>Version 0.4<br></dt>
<dd>First release
</dd>
<dt>Version 0.5<br></dt>
<dd>Added 'VerifyEmail' and 'LogEmail' options. Multiple
'anonymous' tokens allowed. more docs. Added Authoritative
functionality.
</dd>
</dl>
<hr><h2><a name="Person">Contact/person to blame</a></h2>
This module was written for the
<a href="http://ewse.ceo.org">European Wide Service Exchange</a> by
<<a href="mailto:Dirk.vanGulik@jrc.it"><code>Dirk.vanGulik@jrc.it</code></a>>.
Feel free to contact me if you have any problems, ice-creams or bugs. This
documentation, courtesy of Nick Himba, <a href="mailto:himba@cs.utwente.nl">
<code><himba@cs.utwente.nl></code></a>.
<p>
<hr><h2><a NAME="Sourcecode">Sourcecode</a></h2>
The source code can be found at <a href="http://www.apache.org"><code>
http://www.apache.org</code></a>. A snapshot of a development version
usually resides at <a href="http://me-www.jrc.it/~dirkx/mod_auth_anon.c"><code>
http://me-www.jrc.it/~dirkx/mod_auth_anon.c</code></a>. Please make sure
that you always quote the version you use when filing a bug report.
<p>
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