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<h1><a name="convert_http_header_into_environment_variable" id="convert_http_header_into_environment_variable">Convert HTTP header into environment variable</a></h1>
<div class="level1">
<p>
Using <acronym title="LemonLDAP::NG">LL::NG</acronym> in reverse proxy mode, you will not have the <code>REMOTE_USER</code> environment variable set. Indeed, this variable is set by the Handler on the physical server hosting the Handler, and not on other servers where the Handler is not installed.
</p>
<p>
Apache <a href="http://httpd.apache.org/docs/current/mod/mod_setenvif.html" class="urlextern" title="http://httpd.apache.org/docs/current/mod/mod_setenvif.html" rel="nofollow">SetEnvIf module</a> will let you transform the Auth-User <acronym title="Hyper Text Transfer Protocol">HTTP</acronym> header in <code>REMOTE_USER</code> environment variable:
</p>
<pre class="code file apache"><span class="kw1">SetEnvIfNoCase</span> Auth-<span class="kw1">User</span> <span class="st0">"(.*)"</span> REMOTE_USER=$<span class="nu0">1</span></pre>
<p>
This can be used to protect applications relying on <code>REMOTE_USER</code> environment variable in reverse proxy mode. In this case you will have two Apache configuration files:
</p>
<ul>
<li class="level1"><div class="li"> Apache configuration file on <acronym title="LemonLDAP::NG">LL::NG</acronym> reverse proxy (hosting <acronym title="LemonLDAP::NG">LL::NG</acronym> Handler):</div>
</li>
</ul>
<pre class="code file apache"><<span class="kw3">VirtualHost</span> *:80>
<span class="kw1">ServerName</span> application.example.com
PerlHeaderParserHandler My::Package
<span class="kw1">ProxyPreserveHost</span> <span class="kw2">on</span>
<span class="kw1">ProxyPass</span> / http://APPLICATION_IP/
<span class="kw1">ProxyPassReverse</span> / http://APPLICATION_IP/
</<span class="kw3">VirtualHost</span>></pre>
<ul>
<li class="level1"><div class="li"> Apache configuration file on application server (hosting the application):</div>
</li>
</ul>
<pre class="code file apache"><<span class="kw3">VirtualHost</span> *:80>
<span class="kw1">ServerName</span> application.example.com
<span class="kw1">SetEnvIfNoCase</span> Auth-<span class="kw1">User</span> <span class="st0">"(.*)"</span> REMOTE_USER=$1
<span class="kw1">DocumentRoot</span> /var/www/application
</<span class="kw3">VirtualHost</span>></pre>
<p>
<p><div class="notetip">
Sometimes, <acronym title="Hypertext Preprocessor">PHP</acronym> applications also check the <acronym title="Hypertext Preprocessor">PHP</acronym>_AUTH_USER and <acronym title="Hypertext Preprocessor">PHP</acronym>_AUHT_PW environment variables. You can set them the same way:
</p>
<pre class="code file apache"><span class="kw1">SetEnvIfNoCase</span> Auth-<span class="kw1">User</span> <span class="st0">"(.*)"</span> PHP_AUTH_USER=$1
<span class="kw1">SetEnvIfNoCase</span> Auth-Password <span class="st0">"(.*)"</span> PHP_AUTH_PW=$<span class="nu0">1</span></pre>
<p>
Of course, you need to <a href="../../documentation/1.3/passwordstore.html" class="wikilink1" title="documentation:1.3:passwordstore">store password in session</a> to fill <acronym title="Hypertext Preprocessor">PHP</acronym>_AUTH_PW.
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