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<div id="preamble"><h1>Apache Module mod_authnz_fcgi</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authnz_fcgi.html" title="English"> en </a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Allows a FastCGI authorizer application to handle Apache
httpd authentication and authorization</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">ModuleIdentifier:</a></th><td>authnz_fcgi_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">SourceFile:</a></th><td>mod_authnz_fcgi.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.10 and later</td></tr></table>
<h3>Summary</h3>
<p>This module allows FastCGI authorizer applications to
authenticate users and authorize access to resources. It supports
generic FastCGI authorizers which participate in a single phase
for authentication and authorization as well as Apache httpd-specific
authenticators and authorizors which participate in one or both
phases.</p>
<p>FastCGI authorizers can authenticate using user id and password,
such as for Basic authentication, or can authenticate using arbitrary
mechanisms.</p>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#invocations">Invocation modes</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#examples">Additional examples</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitations">Limitations</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#logging">Logging</a></li>
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#authnzfcgicheckauthnprovider">AuthnzFcgiCheckAuthnProvider</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authnzfcgidefineprovider">AuthnzFcgiDefineProvider</a></li>
</ul>
<h3>See also</h3>
<ul class="seealso">
<li><a href="../howto/auth.html">Authentication, Authorization,
and Access Control</a></li>
<li><code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code></li>
<li><code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code></li>
<li><code class="module"><a href="../mod/mod_proxy_fcgi.html">mod_proxy_fcgi</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="invocations" id="invocations">Invocation modes</a></h2>
<p>The invocation modes for FastCGI authorizers supported by this
module are distinguished by two characteristics, <em>type</em> and
auth <em>mechanism</em>.</p>
<p><em>Type</em> is simply <code>authn</code> for authentication,
<code>authz</code> for authorization, or <code>authnz</code> for
combined authentication and authorization.</p>
<p>Auth <em>mechanism</em> refers to the Apache httpd configuration
mechanisms and processing phases, and can be <code>
AuthBasicProvider</code>, <code>Require</code>, or <code>
check_user_id</code>. The first two of these
correspond to the directives used to enable participation in the
appropriate processing phase.</p>
<p>Descriptions of each mode:</p>
<dl>
<dt><em>Type</em> <code>authn</code>, <em>mechanism</em>
<code>AuthBasicProvider</code></dt>
<dd>In this mode,
<code>FCGI_ROLE</code> is set to <code>AUTHORIZER</code> and
<code>FCGI_APACHE_ROLE</code> is set to <code>AUTHENTICATOR</code>.
The application must be defined as provider type <em>authn</em>
using <code class="directive"><a href="#authnzfcgidefineprovider">
AuthnzFcgiDefineProvider</a></code> and enabled with
<code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code>.
When invoked, the application is
expected to authenticate the client using the provided user id and
password. Example application:
<pre class="prettyprint lang-perl">#!/usr/bin/perl
use FCGI;
while (FCGI::accept >= 0) {
die if $ENV{'FCGI_APACHE_ROLE'} ne "AUTHENTICATOR";
die if $ENV{'FCGI_ROLE'} ne "AUTHORIZER";
die if !$ENV{'REMOTE_PASSWD'};
die if !$ENV{'REMOTE_USER'};
print STDERR "This text is written to the web server error log.\n";
if ( ($ENV{'REMOTE_USER' } eq "foo" || $ENV{'REMOTE_USER'} eq "foo1") &&
$ENV{'REMOTE_PASSWD'} eq "bar" ) {
print "Status: 200\n";
print "Variable-AUTHN_1: authn_01\n";
print "Variable-AUTHN_2: authn_02\n";
print "\n";
}
else {
print "Status: 401\n\n";
}
}</pre>
Example configuration:
<pre class="prettyprint lang-config">AuthnzFcgiDefineProvider authn FooAuthn fcgi://localhost:10102/
<Location "/protected/">
AuthType Basic
AuthName "Restricted"
AuthBasicProvider FooAuthn
Require ...
</Location></pre>
</dd>
<dt><em>Type</em> <code>authz</code>, <em>mechanism</em>
<code>Require</code></dt>
<dd>In this mode, <code>FCGI_ROLE</code> is set to <code>
AUTHORIZER</code> and <code>FCGI_APACHE_ROLE</code> is set to
<code>AUTHORIZER</code>. The application must be defined as
provider type <em>authz</em> using <code class="directive"><a href="#authnzfcgidefineprovider">
AuthnzFcgiDefineProvider</a></code>. When invoked, the application
is expected to authorize the client using the provided user id and other
request data. Example application:
<pre class="prettyprint lang-perl">#!/usr/bin/perl
use FCGI;
while (FCGI::accept >= 0) {
die if $ENV{'FCGI_APACHE_ROLE'} ne "AUTHORIZER";
die if $ENV{'FCGI_ROLE'} ne "AUTHORIZER";
die if $ENV{'REMOTE_PASSWD'};
print STDERR "This text is written to the web server error log.\n";
if ($ENV{'REMOTE_USER'} eq "foo1") {
print "Status: 200\n";
print "Variable-AUTHZ_1: authz_01\n";
print "Variable-AUTHZ_2: authz_02\n";
print "\n";
}
else {
print "Status: 403\n\n";
}
}</pre>
Example configuration:
<pre class="prettyprint lang-config">AuthnzFcgiDefineProvider authz FooAuthz fcgi://localhost:10103/
<Location "/protected/">
AuthType ...
AuthName ...
AuthBasicProvider ...
Require FooAuthz
</Location></pre>
</dd>
<dt><em>Type</em> <code>authnz</code>, <em>mechanism</em>
<code>AuthBasicProvider</code> <em>+</em> <code>Require</code></dt>
<dd>In this mode, which supports the web server-agnostic FastCGI
<code>AUTHORIZER</code> protocol, <code>FCGI_ROLE</code> is set to
<code>AUTHORIZER</code> and <code>FCGI_APACHE_ROLE</code> is not set.
The application must be defined as provider type <em>authnz</em>
using <code class="directive"><a href="#authnzfcgidefineprovider">
AuthnzFcgiDefineProvider</a></code>. The application is expected to
handle both authentication and authorization in the same invocation
using the user id, password, and other request data. The invocation
occurs during the Apache httpd API authentication phase. If the
application returns 200 and the same provider is invoked during the
authorization phase (via <code class="directive">Require</code>), mod_authnz_fcgi
will return success for the authorization phase without invoking the
application. Example application:
<pre class="prettyprint lang-perl">#!/usr/bin/perl
use FCGI;
while (FCGI::accept >= 0) {
die if $ENV{'FCGI_APACHE_ROLE'};
die if $ENV{'FCGI_ROLE'} ne "AUTHORIZER";
die if !$ENV{'REMOTE_PASSWD'};
die if !$ENV{'REMOTE_USER'};
print STDERR "This text is written to the web server error log.\n";
if ( ($ENV{'REMOTE_USER' } eq "foo" || $ENV{'REMOTE_USER'} eq "foo1") &&
$ENV{'REMOTE_PASSWD'} eq "bar" &&
$ENV{'REQUEST_URI'} =~ m%/bar/.*%) {
print "Status: 200\n";
print "Variable-AUTHNZ_1: authnz_01\n";
print "Variable-AUTHNZ_2: authnz_02\n";
print "\n";
}
else {
print "Status: 401\n\n";
}
}</pre>
Example configuration:
<pre class="prettyprint lang-config">AuthnzFcgiDefineProvider authnz FooAuthnz fcgi://localhost:10103/
<Location "/protected/">
AuthType Basic
AuthName "Restricted"
AuthBasicProvider FooAuthnz
Require FooAuthnz
</Location></pre>
</dd>
<dt><em>Type</em> <code>authn</code>, <em>mechanism</em>
<code>check_user_id</code></dt>
<dd>In this mode, <code>FCGI_ROLE</code> is set to <code>
AUTHORIZER</code> and <code>FCGI_APACHE_ROLE</code> is set to
<code>AUTHENTICATOR</code>. The application must be defined as
provider type <em>authn</em> using <code class="directive"><a href="#authnzfcgidefineprovider">
AuthnzFcgiDefineProvider</a></code>. <code class="directive"><a href="#authnzfcgicheckauthnprovider">AuthnzFcgiCheckAuthnProvider</a></code>
specifies when it is called. Example application:
<pre class="prettyprint lang-perl">#!/usr/bin/perl
use FCGI;
while (FCGI::accept >= 0) {
die if $ENV{'FCGI_APACHE_ROLE'} ne "AUTHENTICATOR";
die if $ENV{'FCGI_ROLE'} ne "AUTHORIZER";
# This authorizer assumes that the RequireBasicAuth option of
# AuthnzFcgiCheckAuthnProvider is On:
die if !$ENV{'REMOTE_PASSWD'};
die if !$ENV{'REMOTE_USER'};
print STDERR "This text is written to the web server error log.\n";
if ( ($ENV{'REMOTE_USER' } eq "foo" || $ENV{'REMOTE_USER'} eq "foo1") &&
$ENV{'REMOTE_PASSWD'} eq "bar" ) {
print "Status: 200\n";
print "Variable-AUTHNZ_1: authnz_01\n";
print "Variable-AUTHNZ_2: authnz_02\n";
print "\n";
}
else {
print "Status: 401\n\n";
# If a response body is written here, it will be returned to
# the client.
}
}</pre>
Example configuration:
<pre class="prettyprint lang-config">AuthnzFcgiDefineProvider authn FooAuthn fcgi://localhost:10103/
<Location "/protected/">
AuthType ...
AuthName ...
AuthnzFcgiCheckAuthnProvider FooAuthn \
Authoritative On \
RequireBasicAuth Off \
UserExpr "%{reqenv:REMOTE_USER}"
Require ...
</Location></pre>
</dd>
</dl>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="examples" id="examples">Additional examples</a></h2>
<ol>
<li>If your application supports the separate authentication and
authorization roles (<code>AUTHENTICATOR</code> and <code>AUTHORIZER</code>), define
separate providers as follows, even if they map to the same
application:
<pre class="prettyprint lang-config">AuthnzFcgiDefineProvider authn FooAuthn fcgi://localhost:10102/
AuthnzFcgiDefineProvider authz FooAuthz fcgi://localhost:10102/</pre>
Specify the authn provider on
<code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code>
and the authz provider on
<code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code>:
<pre class="prettyprint lang-config">AuthType Basic
AuthName "Restricted"
AuthBasicProvider FooAuthn
Require FooAuthz</pre>
</li>
<li>If your application supports the generic <code>AUTHORIZER</code> role
(authentication and authorizer in one invocation), define a
single provider as follows:
<pre class="prettyprint lang-config">AuthnzFcgiDefineProvider authnz FooAuthnz fcgi://localhost:10103/</pre>
Specify the authnz provider on both <code class="directive">AuthBasicProvider</code>
and <code class="directive">Require</code>:
<pre class="prettyprint lang-config">AuthType Basic
AuthName "Restricted"
AuthBasicProvider FooAuthnz
Require FooAuthnz</pre>
</li>
</ol>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="limitations" id="limitations">Limitations</a></h2>
<p>The following are potential features which are not currently
implemented:</p>
<dl>
<dt>Apache httpd access checker</dt>
<dd>The Apache httpd API <em>access check</em> phase is a separate
phase from authentication and authorization. Some other FastCGI
implementations implement this phase, which is denoted by the
setting of <code>FCGI_APACHE_ROLE</code> to <code>ACCESS_CHECKER</code>.</dd>
<dt>Local (Unix) sockets or pipes</dt>
<dd>Only TCP sockets are currently supported.</dd>
<dt>Support for mod_authn_socache</dt>
<dd>mod_authn_socache interaction should be implemented for
applications which participate in Apache httpd-style
authentication.</dd>
<dt>Support for digest authentication using AuthDigestProvider</dt>
<dd>This is expected to be a permanent limitation as there is
no authorizer flow for retrieving a hash.</dd>
<dt>Application process management</dt>
<dd>This is expected to be permanently out of scope for
this module. Application processes must be controlled by
other means. For example, <code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code> can be used to
start them.</dd>
<dt>AP_AUTH_INTERNAL_PER_URI</dt>
<dd>All providers are currently registered as
AP_AUTH_INTERNAL_PER_CONF, which means that checks are not
performed again for internal subrequests with the same
access control configuration as the initial request.</dd>
<dt>Protocol data charset conversion</dt>
<dd>If mod_authnz_fcgi runs in an EBCDIC compilation
environment, all FastCGI protocol data is written in EBCDIC
and expected to be received in EBCDIC.</dd>
<dt>Multiple requests per connection</dt>
<dd>Currently the connection to the FastCGI authorizer is
closed after every phase of processing. For example, if the
authorizer handles separate <em>authn</em> and <em>authz</em>
phases then two connections will be used.</dd>
<dt>URI Mapping</dt>
<dd>URIs from clients can't be mapped, such as with the <code class="directive">
ProxyPass</code> used with FastCGI responders.</dd>
</dl>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="logging" id="logging">Logging</a></h2>
<ol>
<li>Processing errors are logged at log level <code>error</code>
and higher.</li>
<li>Messages written by the application are logged at log
level <code>warn</code>.</li>
<li>General messages for debugging are logged at log level
<code>debug</code>.</li>
<li>Environment variables passed to the application are
logged at log level <code>trace2</code>. The value of the
<code>REMOTE_PASSWD</code> variable will be obscured,
but <strong>any other sensitive data will be visible in the
log</strong>.</li>
<li>All I/O between the module and the FastCGI application,
including all environment variables, will be logged in printable
and hex format at log level <code>trace5</code>. <strong>All
sensitive data will be visible in the log.</strong></li>
</ol>
<p><code class="directive"><a href="../mod/core.html#loglevel">LogLevel</a></code> can be used
to configure a log level specific to mod_authnz_fcgi. For
example:</p>
<pre class="prettyprint lang-config">LogLevel info authnz_fcgi:trace8</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="AuthnzFcgiCheckAuthnProvider" id="AuthnzFcgiCheckAuthnProvider">AuthnzFcgiCheckAuthnProvider</a> <a name="authnzfcgicheckauthnprovider" id="authnzfcgicheckauthnprovider">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables a FastCGI application to handle the check_authn
authentication hook.</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnzFcgiCheckAuthnProvider <em>provider-name</em>|<code>None</code>
<em>option</em> ...</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>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authnz_fcgi</td></tr>
</table>
<p>This directive is used to enable a FastCGI authorizer to
handle a specific processing phase of authentication or
authorization.</p>
<p>Some capabilities of FastCGI authorizers require enablement
using this directive instead of
<code class="directive">AuthBasicProvider</code>:</p>
<ul>
<li>Non-Basic authentication; generally, determining the user
id of the client and returning it from the authorizer; see the
<code>UserExpr</code> option below</li>
<li>Selecting a custom response code; for a non-200 response
from the authorizer, the code from the authorizer will be the
status of the response</li>
<li>Setting the body of a non-200 response; if the authorizer
provides a response body with a non-200 response, that body
will be returned to the client; up to 8192 bytes of text are
supported</li>
</ul>
<dl>
<dt><em>provider-name</em></dt>
<dd>This is the name of a provider defined with <code class="directive">
AuthnzFcgiDefineProvider</code>.</dd>
<dt><code>None</code></dt>
<dd>Specify <code>None</code> to disable a provider enabled
with this directive in an outer scope, such as in a parent
directory.</dd>
<dt><em>option</em></dt>
<dd>The following options are supported:
<dl>
<dt>Authoritative On|Off (default On)</dt>
<dd>This controls whether or not other modules are allowed
to run when this module has a FastCGI authorizer configured
and it fails the request.</dd>
<dt>DefaultUser <em>userid</em></dt>
<dd>When the authorizer returns success and <code>UserExpr</code>
is configured and evaluates to an empty string (e.g., authorizer
didn't return a variable), this value will be used as the user
id. This is typically used when the authorizer has a concept of
guest, or unauthenticated, users and guest users are mapped to
some specific user id for logging and other purposes.</dd>
<dt>RequireBasicAuth On|Off (default Off)</dt>
<dd>This controls whether or not Basic auth is required
before passing the request to the authorizer. If required,
the authorizer won't be invoked without a user id and
password; 401 will be returned for a request without that.</dd>
<dt>UserExpr <em>expr</em> (no default)</dt>
<dd>When Basic authentication isn't provided by the client
and the authorizer determines the user, this expression,
evaluated after calling the authorizer, determines the
user. The expression follows <a href="../expr.html">
ap_expr syntax</a> and must resolve to a string. A typical
use is to reference a <code>Variable-<em>XXX</em></code>
setting returned by the authorizer using an option like
<code>UserExpr "%{reqenv:<em>XXX</em>}"</code>. If
this option is specified and the user id can't be retrieved
using the expression after a successful authentication, the
request will be rejected with a 500 error.</dd>
</dl>
</dd>
</dl>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthnzFcgiDefineProvider" id="AuthnzFcgiDefineProvider">AuthnzFcgiDefineProvider</a> <a name="authnzfcgidefineprovider" id="authnzfcgidefineprovider">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Defines a FastCGI application as a provider for
authentication and/or authorization</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnzFcgiDefineProvider <em>type</em> <em>provider-name</em>
<em>backend-address</em></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>server config</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_authnz_fcgi</td></tr>
</table>
<p>This directive is used to define a FastCGI application as
a provider for a particular phase of authentication or
authorization.</p>
<dl>
<dt><em>type</em></dt>
<dd>This must be set to <em>authn</em> for authentication,
<em>authz</em> for authorization, or <em>authnz</em> for
a generic FastCGI authorizer which performs both checks.</dd>
<dt><em>provider-name</em></dt>
<dd>This is used to assign a name to the provider which is
used in other directives such as
<code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code>
and
<code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code>.</dd>
<dt><em>backend-address</em></dt>
<dd>This specifies the address of the application, in the form
<em>fcgi://hostname:port/</em>. The application process(es)
must be managed independently, such as with
<code class="program"><a href="../programs/fcgistarter.html">fcgistarter</a></code>.</dd>
</dl>
</div>
</div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authnz_fcgi.html" title="English"> en </a></p>
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