Using PHP’s HTTP auth with Shibboleth

If you have a PHP application that uses the internal auth handling then, so long as it only needs PHP_AUTH_USER and not PHP_AUTH_PW, you can use it with Shibboleth by adding the following to your .htaccess file:

   RewriteEngine on
   RewriteCond %{REMOTE_USER} ^(.+)@[^@]+$
   RewriteRule .? - [E=PHP_AUTH_USER:%1]

This checks for the existence of the standard REMOTE_USER variable (which Shib does properly set) and, if it matches the standard uid@scope format, copies only the user ID portion into PHP_AUTH_USER so as to match how the other HTTP auth mechanisms (Basic, Digest, Kerberos, etc.) populate the value.


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