HTTP Authentication When PHP Runs As A CGI/PHPSuExec

PHP is a feature-rich programming language that includes simple HTTP authentication. Unfortunately, if PHP is running under CGI then PHP scripts cannot use HTTP authentication. The workaround for this problem is to use mod_rewrite to pass HTTP authentication info to scripts as a GET parameter.

The following are step-by-step instructions on how to get HTTP authentication working when PHP is running as a CGI/PHPSuExec.

Step 1:
Create a plain text file using a text editor such as Windows Notepad.

Step 2:
Add the following text...


<IfModule mod_rewrite.c>
     RewriteEngine on
     RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]


Step 3:
Save the file as a plain text file. Name the file ".htaccess"

Step 4:
Upload the .htaccess file in ASCII mode to your web space using an FTP application.

Step 5:
Add the following in your PHP script right before your user/pass check routine.


list($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW']) = explode(':', base64_decode(substr($_SERVER['HTTP_AUTHORIZATION'], 6)));




// split user/pass parts
list($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW']) = explode(':', base64_decode(substr($_SERVER['HTTP_AUTHORIZATION'], 6)));

// open user/pass prompt
if (!isset($_SERVER['PHP_AUTH_USER'])) {
   header('WWW-Authenticate: Basic realm="Your Realm"');
   header('HTTP/1.0 401 Unauthorized');
   echo 'Text to send if Cancel button is used';
 } else {
   echo "<p>Greetings: </p>".$_SERVER['PHP_AUTH_USER'];
   echo "<p>Password you entered: </p>".$_SERVER['PHP_AUTH_PW'];


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