manage visitor IP behind reverse proxies, refs #36

[jirafeau_project.git] / lib / functions.php

diff --git a/lib/functions.php b/lib/functions.php
index c2cad4653d209eab87a083dff6e359f90644f9d1..77acae1bd973f281586111e295bf096eef3234bd 100644 (file)
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -1084,3 +1084,53 @@ function jirafeau_challenge_upload_password ($cfg, $password)
     return false;
 }
 
+/**
+ * Test if visitor's IP is authorized to upload.
+ * @param $ip IP to be challenged
+ * @return true if IP is authorized, false otherwise.
+ */
+function jirafeau_challenge_upload_ip ($cfg, $ip)
+{
+    if (count ($cfg['upload_ip']) == 0)
+        return true;
+    forEach ($cfg['upload_ip'] as $i)
+    {
+        if ($i == $ip)
+            return true;
+        // CIDR test for IPv4 only.
+        if (strpos ($i, '/') !== false)
+        {
+            list ($subnet, $mask) = explode('/', $i);
+            if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet))
+                return true;
+        }
+    }
+    return false;
+}
+
+/**
+ * Get the ip address of the client from REMOTE_ADDR
+ * or from HTTP_X_FORWARDED_FOR if behind a proxy
+ * @returns an the client ip address
+ */
+function get_ip_address($cfg) {
+    if (count ($cfg['proxy_ip']) == 0 ||
+        empty ($_SERVER['HTTP_X_FORWARDED_FOR']))
+        return $_SERVER['REMOTE_ADDR'];
+
+    $iplist = explode (',', $_SERVER['HTTP_X_FORWARDED_FOR']);
+    if (count ($iplist) == 0)
+        return $_SERVER['REMOTE_ADDR'];
+
+    foreach ($cfg['proxy_ip'] as $proxy_ip)
+    {
+        if ($_SERVER['REMOTE_ADDR'] != $proxy_ip)
+            continue;
+
+        // Take the last IP (the one which has been set by our proxy).
+        $ip = end($iplist);
+        $ip = preg_replace ('/\s+/', '', $ip);
+        return $ip;
+    }
+    return $_SERVER['REMOTE_ADDR'];
+}