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dan223 at gmail dot com
8 years ago
A simple script for SSL Client Certificate authentication with a basic authentication fall-back. I use this on my site using LDAP server to check username/passwords and client certificate to user mapping.

<?
// Check if and how we are authenticated
if ($_SERVER['SSL_CLIENT_VERIFY'] != "SUCCESS") { // Not using a client certificate
if ((!$_SERVER['PHP_AUTH_USER']) && (!$_SERVER['PHP_AUTH_PW'])) { // Not logged in using basic authentication
authenticate(); // Send basic authentication headers
}
}

if ($_SERVER['SSL_CLIENT_S_DN_CN'] != "chris") { // Check CN name of cert

if (!(($_SERVER['PHP_AUTH_USER'] == "test") && ($_SERVER['PHP_AUTH_PW'] == "123"))) { // Check username and password
authenticate(); // Send basic authentication headers because username and/or password didnot match
}
}

phpinfo();

// Call authentication display
function authenticate() {
Header("WWW-Authenticate: Basic realm=Website");
Header("HTTP/1.0 401 Unauthorized");
error401();
exit;
}
?>

See my website (http://velocitypress.ca/index.php?page=/manuals/) for more details on client certificate with Apache and PHP.

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