Changeset 7495 for trunk/include/functions.inc.php

Timestamp:

Oct 30, 2010, 1:32:11 PM (14 years ago)

Author:

rvelices

Message:

feature 1915: add protection on user registration against robots

File:

• trunk/include/functions.inc.php (modified) (1 diff)

trunk/include/functions.inc.php

@@ -1334 +1334 @@
 
 /**
- * returns a "secret key" that is to be sent back when a user enters a comment
- *
- * @param int image_id
- */
-function get_comment_post_key($image_id)
-{
-  global $conf;
-
-  $time = time();
-
-  return sprintf(
-    '%s:%s',
-    $time,
-    hash_hmac(
-      'md5',
-      $time.':'.$image_id,
-      $conf['secret_key']
-      )
-    );
+ * returns a "secret key" that is to be sent back when a user posts a form
+ *
+ * @param int valid_after_seconds - key validity start time from now
+ */
+function get_ephemeral_key($valid_after_seconds, $aditionnal_data_to_hash = '')
+{
+        global $conf;
+        $time = round(microtime(true), 1);
+        return $time.':'.$valid_after_seconds.':'
+                .hash_hmac(
+                        'md5', 
+                        $time.substr($_SERVER['REMOTE_ADDR'],0,5).$valid_after_seconds.$aditionnal_data_to_hash, 
+                        $conf['secret_key']);
+}
+
+function verify_ephemeral_key($key, $aditionnal_data_to_hash = '')
+{
+        global $conf;
+        $time = microtime(true);
+        $key = explode( ':', @$key );
+        if ( count($key)!=3
+                or $key[0]>$time-(float)$key[1] // page must have been retrieved more than X sec ago
+                or $key[0]<$time-3600 // 60 minutes expiration
+                or hash_hmac(
+                          'md5', $key[0].substr($_SERVER['REMOTE_ADDR'],0,5).$key[1].$aditionnal_data_to_hash, $conf['secret_key']
+                        ) != $key[2]
+          )
+        {
+                return false;
+        }
+        return true;
 }