[mod] implement is_hmac_of() in webutils / close to new_hmac()

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>, Alexandre Flament

1 files changed, 2 insertions, 3 deletions

diff --git a/searx/webapp.py b/searx/webapp.py
index 788e0d24f..a2aa84d9d 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -71,6 +71,7 @@ from searx.webutils import (
     get_themes,
     prettify_url,
     new_hmac,
+    is_hmac_of,
     is_flask_run_cmdline,
 )
 from searx.webadapter import (
@@ -1067,9 +1068,7 @@ def image_proxy():
     if not url:
         return '', 400
 
-    h_url = new_hmac(settings['server']['secret_key'], url.encode())
-    h_args = request.args.get('h')
-    if len(h_url) != len(h_args) or not hmac.compare_digest(h_url, h_args):
+    if not is_hmac_of(settings['server']['secret_key'], url.encode(), request.args.get('h', '')):
         return '', 400
 
     maximum_size = 5 * 1024 * 1024