From 8350bef3e3baea6042ed3780a054cc65707e9f8d Mon Sep 17 00:00:00 2001
From: Dennis Fink
Date: Mon, 10 Aug 2026 19:36:49 +0200
Subject: fix(receiver): prevent requests to non-public addresses

Resolve source hostnames before fetching and reject addresses that are
not globally routable to prevent SSRF against local or private services.

Repeat the check for every HTTP request so redirects cannot bypass the
initial source validation. Treat DNS resolution failures during
verification as temporary fetch errors.
---
 tests/test_forms.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'tests/test_forms.py')

diff --git a/tests/test_forms.py b/tests/test_forms.py
index 9be6ca8..2d5fc01 100644
--- a/tests/test_forms.py
+++ b/tests/test_forms.py
@@ -89,6 +89,7 @@ VALID_TARGET = "https://dennisfink.me/blog/example/"
 )
 def test_endpoint_form_rejects_invalid_data(
     app: Flask,
+    public_dns: None,
     form_data: dict[str, str],
     invalid_field: str,
     expected_error: str | None,
@@ -111,6 +112,7 @@ def test_endpoint_form_rejects_invalid_data(
 
 def test_endpoint_form_accepts_valid_data(
     app: Flask,
+    public_dns: None,
 ) -> None:
     with app.test_request_context(
         "/endpoint",
-- 
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