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diff --git a/test/pleroma/web/web_finger_test.exs b/test/pleroma/web/web_finger_test.exs
index 7b4b2d523..eb03c736e 100644
--- a/test/pleroma/web/web_finger_test.exs
+++ b/test/pleroma/web/web_finger_test.exs
@@ -1,267 +1,307 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.WebFingerTest do
use Pleroma.DataCase, async: true
alias Pleroma.Web.WebFinger
import Pleroma.Factory
import Tesla.Mock
setup do
mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
:ok
end
describe "host meta" do
test "returns a link to the xml lrdd" do
host_info = WebFinger.host_meta()
assert String.contains?(host_info, Pleroma.Web.Endpoint.url())
end
end
describe "incoming webfinger request" do
test "works for fqns" do
user = insert(:user)
{:ok, result} =
WebFinger.webfinger("#{user.nickname}@#{Pleroma.Web.Endpoint.host()}", "XML")
assert is_binary(result)
end
test "works for ap_ids" do
user = insert(:user)
{:ok, result} = WebFinger.webfinger(user.ap_id, "XML")
assert is_binary(result)
end
end
test "requires exact match for Endpoint host or WebFinger domain" do
clear_config([Pleroma.Web.WebFinger, :domain], "pleroma.dev")
user = insert(:user)
assert {:error, "Couldn't find user"} ==
WebFinger.webfinger("#{user.nickname}@#{Pleroma.Web.Endpoint.host()}xxxx", "JSON")
assert {:error, "Couldn't find user"} ==
WebFinger.webfinger("#{user.nickname}@pleroma.devxxxx", "JSON")
assert {:ok, _} =
WebFinger.webfinger("#{user.nickname}@#{Pleroma.Web.Endpoint.host()}", "JSON")
assert {:ok, _} =
WebFinger.webfinger("#{user.nickname}@pleroma.dev", "JSON")
end
describe "fingering" do
test "returns error for nonsensical input" do
assert {:error, _} = WebFinger.finger("bliblablu")
assert {:error, _} = WebFinger.finger("pleroma.social")
end
test "returns error when there is no content-type header" do
Tesla.Mock.mock(fn
%{url: "https://social.heldscal.la/.well-known/host-meta"} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/social.heldscal.la_host_meta")
}}
%{
url:
"https://social.heldscal.la/.well-known/webfinger?resource=acct:invalid_content@social.heldscal.la"
} ->
{:ok, %Tesla.Env{status: 200, body: ""}}
end)
user = "invalid_content@social.heldscal.la"
assert {:error, {:content_type, nil}} = WebFinger.finger(user)
end
test "returns error when fails parse xml or json" do
user = "invalid_content@social.heldscal.la"
assert {:error, %Jason.DecodeError{}} = WebFinger.finger(user)
end
test "returns the ActivityPub actor URI for an ActivityPub user" do
user = "framasoft@framatube.org"
{:ok, _data} = WebFinger.finger(user)
end
test "it works for AP-only user" do
user = "kpherox@mstdn.jp"
{:ok, data} = WebFinger.finger(user)
assert data["magic_key"] == nil
assert data["salmon"] == nil
assert data["topic"] == nil
assert data["subject"] == "acct:kPherox@mstdn.jp"
assert data["ap_id"] == "https://mstdn.jp/users/kPherox"
assert data["subscribe_address"] == "https://mstdn.jp/authorize_interaction?acct={uri}"
end
test "it gets the xrd endpoint" do
{:ok, template} = WebFinger.find_lrdd_template("social.heldscal.la")
assert template == "https://social.heldscal.la/.well-known/webfinger?resource={uri}"
end
test "it gets the xrd endpoint for hubzilla" do
{:ok, template} = WebFinger.find_lrdd_template("macgirvin.com")
assert template == "https://macgirvin.com/xrd/?uri={uri}"
end
test "it gets the xrd endpoint for statusnet" do
{:ok, template} = WebFinger.find_lrdd_template("status.alpicola.com")
assert template == "https://status.alpicola.com/main/xrd?uri={uri}"
end
test "it works with idna domains as nickname" do
nickname = "lain@" <> to_string(:idna.encode("zetsubou.みんな"))
{:ok, _data} = WebFinger.finger(nickname)
end
test "it works with idna domains as link" do
ap_id = "https://" <> to_string(:idna.encode("zetsubou.みんな")) <> "/users/lain"
{:ok, _data} = WebFinger.finger(ap_id)
end
test "respects json content-type" do
Tesla.Mock.mock(fn
%{
url:
"https://mastodon.social/.well-known/webfinger?resource=acct:emelie@mastodon.social"
} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/webfinger_emelie.json"),
headers: [{"content-type", "application/jrd+json"}]
}}
%{url: "https://mastodon.social/.well-known/host-meta"} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/mastodon.social_host_meta")
}}
end)
{:ok, _data} = WebFinger.finger("emelie@mastodon.social")
end
test "respects xml content-type" do
Tesla.Mock.mock(fn
%{
url: "https://pawoo.net/.well-known/webfinger?resource=acct:pekorino@pawoo.net"
} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/https___pawoo.net_users_pekorino.xml"),
headers: [{"content-type", "application/xrd+xml"}]
}}
%{url: "https://pawoo.net/.well-known/host-meta"} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/pawoo.net_host_meta")
}}
end)
{:ok, _data} = WebFinger.finger("pekorino@pawoo.net")
end
test "refuses to process XML remote entities" do
Tesla.Mock.mock(fn
%{
url: "https://pawoo.net/.well-known/webfinger?resource=acct:pekorino@pawoo.net"
} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/xml_external_entities.xml"),
headers: [{"content-type", "application/xrd+xml"}]
}}
%{url: "https://pawoo.net/.well-known/host-meta"} ->
{:ok,
%Tesla.Env{
status: 200,
body: File.read!("test/fixtures/tesla_mock/pawoo.net_host_meta")
}}
end)
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")
}}
%{url: "https://whitehouse.gov/.well-known/webfinger?resource=acct:trump@whitehouse.gov"} ->
{:ok, %Tesla.Env{status: 404}}
end)
{:error, _data} = WebFinger.finger("alex@gleasonator.com")
end
test "prevents forgeries" do
Tesla.Mock.mock(fn
%{
url:
"https://fba.ryona.agency/.well-known/webfinger?resource=acct:graf@fba.ryona.agency"
} ->
fake_webfinger =
File.read!("test/fixtures/webfinger/graf-imposter-webfinger.json") |> Jason.decode!()
Tesla.Mock.json(fake_webfinger)
%{url: url}
when url in [
"https://poa.st/.well-known/webfinger?resource=acct:graf@poa.st",
"https://fba.ryona.agency/.well-known/host-meta"
] ->
{:ok, %Tesla.Env{status: 404}}
end)
assert {:error, _} = WebFinger.finger("graf@fba.ryona.agency")
end
+ test "prevents forgeries even when the spoofed subject exists on the target domain" do
+ Tesla.Mock.mock(fn
+ %{url: url}
+ when url in [
+ "https://attacker.example/.well-known/host-meta",
+ "https://victim.example/.well-known/host-meta"
+ ] ->
+ {:ok, %Tesla.Env{status: 404}}
+
+ %{
+ url:
+ "https://attacker.example/.well-known/webfinger?resource=acct:alice@attacker.example"
+ } ->
+ Tesla.Mock.json(%{
+ "subject" => "acct:alice@victim.example",
+ "links" => [
+ %{
+ "rel" => "self",
+ "type" => "application/activity+json",
+ "href" => "https://attacker.example/users/alice"
+ }
+ ]
+ })
+
+ %{url: "https://victim.example/.well-known/webfinger?resource=acct:alice@victim.example"} ->
+ Tesla.Mock.json(%{
+ "subject" => "acct:alice@victim.example",
+ "links" => [
+ %{
+ "rel" => "self",
+ "type" => "application/activity+json",
+ "href" => "https://victim.example/users/alice"
+ }
+ ]
+ })
+ end)
+
+ assert {:error, _} = WebFinger.finger("alice@attacker.example")
+ end
+
test "works for correctly set up split-domain instances implementing host-meta redirect" do
{:ok, _data} = WebFinger.finger("a@pleroma.example")
{:ok, _data} = WebFinger.finger("a@sub.pleroma.example")
end
test "works for correctly set up split-domain instances without host-meta redirect" do
{:ok, _data} = WebFinger.finger("a@mastodon.example")
{:ok, _data} = WebFinger.finger("a@sub.mastodon.example")
end
end
end

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