prevent evil "Proxy" header being sent, see https://httpoxy.org for details

[mailer.git] / inc / http-functions.php

diff --git a/inc/http-functions.php b/inc/http-functions.php
index cf921efc6be61c48db7bc0a973f77bb822519e9d..acc3c6d5e6b8eddc737a6c151a913d0c14fd36f1 100644 (file)
--- a/inc/http-functions.php
+++ b/inc/http-functions.php
@@ -688,6 +688,12 @@ function extractHostnameFromUrl (&$script) {
 
 // Adds a HTTP header to array
 function addHttpHeader ($header) {
+       // Is 'Proxy' set?
+       if (substr(trim(strtolower($header)), 0, 6) == 'proxy:') {
+               // Don't allow this header being sent
+               reportBug(__FUNCTION__, __LINE__, 'Security-relevant HTTP header "Proxy" detected. Please do not set this. See https://httpoxy.org/ for details.');
+       } // END - if
+
        // Send the header
        //* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, ': header=' . $header);
        array_push($GLOBALS['http_header'], trim($header));