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<h3>Apache HTTP Server Version 1.3</h3>
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<h1 align="CENTER">Module mod_auth_gss</h1>
<p>This module provides for user authentication using GSSAPI Authentication.</p>
<p><a href="module-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Extension<br />
<a href="module-dict.html#SourceFile"
rel="Help"><strong>Source File:</strong></a> mod_auth_gss.c<br />
<a href="module-dict.html#ModuleIdentifier"
rel="Help"><strong>Module Identifier:</strong></a>
auth_gss_module<br />
<h2>Summary</h2>
<p>This module implements GSSAPI authentication using the
"WWW-Authenticate: Negotiate" protocol. This typically
requires the client and the server systems to have support for
GSSAPI and a properly configured security mechanism (usually
Kerberos V5) to be used by GSSAPI.
<h2>Directives</h2>
<ul>
<li><a href="#authgssservicename">AuthGSSServiceName</a></li>
<li><a href="#authgsskeytabfile">AuthGSSKeytabFile</a></li>
<li><a href="#aughgssdebug">AuthGSSDebug</a></li>
</ul>
<h2>Using GSSAPI Authentication</h2>
<p>Before using GSSAPI authentication with Apache, the
system must already have been configured to use Kerberos V5
authentication. All of the major Kerberos V5
implementation (MIT KRB5, Heimdal, Sun, IBM, HP, Microsoft)
currently support Kerberos V5 GSSAPI mechanisms.
Configuring Kerberos is beyond the scope of this document.
Adding GSSAPI authentication support to the web extends
Single sign on capabilities to the intranet and reduces
the risks involved in having users constantly entering
username/password combinations when accessing websites.
<p>
<h3>Configure a Service Principal</h3>
<p>The default service principal that mod_auth_gss will
try to use is "HTTP/f.q.d.n". The key for this principal
must be stored in a keytab file that is readable by the
Apache server, but it should be protected from access
by anyone else, and should <b>definitely not</b> be
stored in an area that can be browsed by clients.
<p>
Example: the Apache server is on host "www.foo.com".
Create a principal called "HTTP/www.foo.com".
Store the key for this principal in a protected keytab
file. Using MIT Kerberos V5:
<br>
<pre>
$ kadmin
$ kadmin> ktadd -k /var/apache/http.keytab HTTP/www.foo.com
$ kadmin> quit
</pre>
<p>Once the keys are created and stored, using GSSAPI
authentication is very simple. Set up the authentication
type for the directories being protected to be "GSSAPI".
If the keytab or service name chosen is not the defaults
("HTTP" and "/var/apache/http.keytab", respectively), then
you may use the above mentioned directives to override
the default values. Example:
<br>
<pre>
<Directory /var/apache/htdocs/krb5>
AuthType GSSAPI
ServiceName HTTP
KeytabFile /var/apache/http.keytab
GssDebug 0
Require valid-user
AllowOverride All
</Directory>
</pre>
<p>GSSAPI authentication provides a more secure authentication
system, but only works with supporting browsers. As of this writing
(April 2004), the only major browsers which support digest
authentication are <a href="http://www.mozilla.org">Mozilla 1.7
(and later)</a>, and <a href="http://www.microsoft.com/windows/ie/">MS Internet
Explorer 5.0</a>.
<p>It is recommended that this authentication method be combined
with TLS security (mod_ssl, for example) to further secure the
authentication data being exchanged.
<h2><a id="authgssservicename"
name="authgssservicename">AuthGSSServiceName</a> directive</h2>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> AuthGSSServiceName
<em>name</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> directory,
.htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo, Indexes, Limit, Options<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Extension<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_auth_gss
<p>The AuthGSSServiceName directive sets the name of Kerberos service
principal that the server uses to authenticate the client requests.
The name given is appended with the fully qualified host name to
make the complete service principal name. Ex: <b>HTTP/www.fooc.om</b>
</p>
<h2><a id="authgsskeytabfile"
name="authgsskeytabfile">AuthGSSKeytabFile</a> directive</h2>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> AuthGSSKeytabFile
<em>filename</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> directory,
.htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo, Indexes, Limit, Options<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Extension<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_auth_gss
<p>The AuthGSSKeytabFile directive sets the filename of the
file where the Apache server's Kerberos credentials are stored.
<h2><a id="authgssdebug"
name="authgsskeytabfile">AuthGSSDebug</a> directive</h2>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> AuthGSSDebug
<em>0 | 1</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> directory,
.htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo, Indexes, Limit, Options<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Extension<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_auth_gss
<p>The AuthGSSDebug directive toggles the debug logging
facility used by the GSSAPI authentication module. 0 disables
debug logging, 1 enables it.
<hr />
<h3 align="CENTER">Apache HTTP Server Version 1.3</h3>
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