From 364f6e1620876dcfc1d228e2db17190d74b6f0ce Mon Sep 17 00:00:00 2001
From: Alex Gleason <alex@alexgleason.me>
Date: Wed, 23 Aug 2023 13:10:19 -0500
Subject: Prevent webfinger spoofing

---
 test/fixtures/tesla_mock/gleasonator.com_host_meta |  4 +++
 test/fixtures/tesla_mock/webfinger_spoof.json      | 28 ++++++++++++++++
 test/pleroma/web/web_finger_test.exs               | 38 +++++++++++++---------
 3 files changed, 55 insertions(+), 15 deletions(-)
 create mode 100644 test/fixtures/tesla_mock/gleasonator.com_host_meta
 create mode 100644 test/fixtures/tesla_mock/webfinger_spoof.json

(limited to 'test')

diff --git a/test/fixtures/tesla_mock/gleasonator.com_host_meta b/test/fixtures/tesla_mock/gleasonator.com_host_meta
new file mode 100644
index 000000000..c1a432519
--- /dev/null
+++ b/test/fixtures/tesla_mock/gleasonator.com_host_meta
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
+  <Link rel="lrdd" template="https://gleasonator.com/.well-known/webfinger?resource={uri}" type="application/xrd+xml" />
+</XRD>
\ No newline at end of file
diff --git a/test/fixtures/tesla_mock/webfinger_spoof.json b/test/fixtures/tesla_mock/webfinger_spoof.json
new file mode 100644
index 000000000..7c2a11f69
--- /dev/null
+++ b/test/fixtures/tesla_mock/webfinger_spoof.json
@@ -0,0 +1,28 @@
+{
+  "aliases": [
+    "https://gleasonator.com/users/alex",
+    "https://mitra.social/users/alex"
+  ],
+  "links": [
+    {
+      "href": "https://gleasonator.com/users/alex",
+      "rel": "http://webfinger.net/rel/profile-page",
+      "type": "text/html"
+    },
+    {
+      "href": "https://gleasonator.com/users/alex",
+      "rel": "self",
+      "type": "application/activity+json"
+    },
+    {
+      "href": "https://gleasonator.com/users/alex",
+      "rel": "self",
+      "type": "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""
+    },
+    {
+      "rel": "http://ostatus.org/schema/1.0/subscribe",
+      "template": "https://gleasonator.com/ostatus_subscribe?acct={uri}"
+    }
+  ],
+  "subject": "acct:trump@whitehouse.gov"
+}
diff --git a/test/pleroma/web/web_finger_test.exs b/test/pleroma/web/web_finger_test.exs
index 6530fbc56..84a8e19d5 100644
--- a/test/pleroma/web/web_finger_test.exs
+++ b/test/pleroma/web/web_finger_test.exs
@@ -76,15 +76,6 @@ defmodule Pleroma.Web.WebFingerTest do
       {:ok, _data} = WebFinger.finger(user)
     end
 
-    test "returns the ActivityPub actor URI and subscribe address for an ActivityPub user with the ld+json mimetype" do
-      user = "kaniini@gerzilla.de"
-
-      {:ok, data} = WebFinger.finger(user)
-
-      assert data["ap_id"] == "https://gerzilla.de/channel/kaniini"
-      assert data["subscribe_address"] == "https://gerzilla.de/follow?f=&url={uri}"
-    end
-
     test "it work for AP-only user" do
       user = "kpherox@mstdn.jp"
 
@@ -99,12 +90,6 @@ defmodule Pleroma.Web.WebFingerTest do
       assert data["subscribe_address"] == "https://mstdn.jp/authorize_interaction?acct={uri}"
     end
 
-    test "it works for friendica" do
-      user = "lain@squeet.me"
-
-      {:ok, _data} = WebFinger.finger(user)
-    end
-
     test "it gets the xrd endpoint" do
       {:ok, template} = WebFinger.find_lrdd_template("social.heldscal.la")
 
@@ -203,6 +188,29 @@ defmodule Pleroma.Web.WebFingerTest do
 
       assert :error = WebFinger.finger("pekorino@pawoo.net")
     end
+
+    test "prevents spoofing" do
+      Tesla.Mock.mock(fn
+        %{
+          url: "https://gleasonator.com/.well-known/webfinger?resource=acct:alex@gleasonator.com"
+        } ->
+          {:ok,
+           %Tesla.Env{
+             status: 200,
+             body: File.read!("test/fixtures/tesla_mock/webfinger_spoof.json"),
+             headers: [{"content-type", "application/jrd+json"}]
+           }}
+
+        %{url: "https://gleasonator.com/.well-known/host-meta"} ->
+          {:ok,
+           %Tesla.Env{
+             status: 200,
+             body: File.read!("test/fixtures/tesla_mock/gleasonator.com_host_meta")
+           }}
+      end)
+
+      {:error, _data} = WebFinger.finger("alex@gleasonator.com")
+    end
   end
 
   test "prevents forgeries" do
-- 
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