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<h1 class="sectionedit1" id="convert_http_header_into_environment_variable">Convert HTTP header into environment variable</h1>
<div class="level1">
<p>
Using <abbr title="LemonLDAP::NG">LL::NG</abbr> 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 HTTP 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=$1</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 <abbr title="LemonLDAP::NG">LL::NG</abbr> reverse proxy (hosting <abbr title="LemonLDAP::NG">LL::NG</abbr> Handler):</div>
</li>
</ul>
<pre class="code file apache"><<span class="kw3">VirtualHost</span> *:<span class="nu0">80</span>>
<span class="kw1">ServerName</span> application.example.com
PerlHeaderParserHandler Lemonldap::NG::Handler
<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> *:<span class="nu0">80</span>>
<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>
<div class="notetip">Sometimes, PHP applications also check the PHP_AUTH_USER and PHP_AUHT_PW environment variables. You can set them the same way:
<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=$1</pre>
<p>
Of course, you need to <a href="passwordstore.html" class="wikilink1" title="documentation:1.9:passwordstore">store password in session</a> to fill PHP_AUTH_PW.
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