From d0b18e338bfed05c6b2c4a8f5c63d865d9eb669c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?marcin=20miko=C5=82ajczak?= Date: Thu, 24 Aug 2023 00:37:39 +0200 Subject: [PATCH] Fix validate_webfinger when running a different domain for Webfinger MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: marcin mikołajczak --- lib/pleroma/application.ex | 3 ++- lib/pleroma/web/web_finger.ex | 30 ++++++++++++++++++++++-------- test/pleroma/user_test.exs | 4 ++-- 3 files changed, 26 insertions(+), 11 deletions(-) diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex index 75154f94c..649bb11c8 100644 --- a/lib/pleroma/application.ex +++ b/lib/pleroma/application.ex @@ -162,7 +162,8 @@ defp cachex_children do expiration: chat_message_id_idempotency_key_expiration(), limit: 500_000 ), - build_cachex("rel_me", limit: 2500) + build_cachex("rel_me", limit: 2500), + build_cachex("host_meta", default_ttl: :timer.minutes(120), limit: 5000) ] end diff --git a/lib/pleroma/web/web_finger.ex b/lib/pleroma/web/web_finger.ex index a84a4351b..e653b3338 100644 --- a/lib/pleroma/web/web_finger.ex +++ b/lib/pleroma/web/web_finger.ex @@ -155,7 +155,16 @@ def get_template_from_xml(body) do end end + @cachex Pleroma.Config.get([:cachex, :provider], Cachex) def find_lrdd_template(domain) do + @cachex.fetch!(:host_meta_cache, domain, fn _ -> + {:commit, fetch_lrdd_template(domain)} + end) + rescue + e -> {:error, "Cachex error: #{inspect(e)}"} + end + + defp fetch_lrdd_template(domain) do # WebFinger is restricted to HTTPS - https://tools.ietf.org/html/rfc7033#section-9.1 meta_url = "https://#{domain}/.well-known/host-meta" @@ -168,7 +177,7 @@ def find_lrdd_template(domain) do end end - defp get_address_from_domain(domain, encoded_account) when is_binary(domain) do + defp get_address_from_domain(domain, "acct:" <> _ = encoded_account) when is_binary(domain) do case find_lrdd_template(domain) do {:ok, template} -> String.replace(template, "{uri}", encoded_account) @@ -178,6 +187,11 @@ defp get_address_from_domain(domain, encoded_account) when is_binary(domain) do end end + defp get_address_from_domain(domain, account) when is_binary(domain) do + encoded_account = URI.encode("acct:#{account}") + get_address_from_domain(domain, encoded_account) + end + defp get_address_from_domain(_, _), do: {:error, :webfinger_no_domain} @spec finger(String.t()) :: {:ok, map()} | {:error, any()} @@ -192,9 +206,7 @@ def finger(account) do URI.parse(account).host end - encoded_account = URI.encode("acct:#{account}") - - with address when is_binary(address) <- get_address_from_domain(domain, encoded_account), + with address when is_binary(address) <- get_address_from_domain(domain, account), {:ok, %{status: status, body: body, headers: headers}} when status in 200..299 <- HTTP.get( address, @@ -227,13 +239,15 @@ def finger(account) do end end - defp validate_webfinger(url, %{"subject" => "acct:" <> acct} = data) do - with %URI{host: request_host} <- URI.parse(url), - [_name, acct_host] <- String.split(acct, "@"), + defp validate_webfinger(request_url, %{"subject" => "acct:" <> acct = subject} = data) do + with [_name, acct_host] <- String.split(acct, "@"), + {_, url} <- {:address, get_address_from_domain(acct_host, subject)}, + %URI{host: request_host} <- URI.parse(request_url), + %URI{host: acct_host} <- URI.parse(url), {_, true} <- {:hosts_match, acct_host == request_host} do {:ok, data} else - _ -> {:error, {:webfinger_invalid, url, data}} + _ -> {:error, {:webfinger_invalid, request_url, data}} end end diff --git a/test/pleroma/user_test.exs b/test/pleroma/user_test.exs index 48391d871..7f1a8d893 100644 --- a/test/pleroma/user_test.exs +++ b/test/pleroma/user_test.exs @@ -877,7 +877,7 @@ test "gets an existing user by nickname starting with http" do setup do: clear_config([Pleroma.Web.WebFinger, :update_nickname_on_user_fetch], true) test "for mastodon" do - Tesla.Mock.mock(fn + Tesla.Mock.mock_global(fn %{url: "https://example.com/.well-known/host-meta"} -> %Tesla.Env{ status: 302, @@ -935,7 +935,7 @@ test "for mastodon" do end test "for pleroma" do - Tesla.Mock.mock(fn + Tesla.Mock.mock_global(fn %{url: "https://example.com/.well-known/host-meta"} -> %Tesla.Env{ status: 302,