diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/pleroma/signature.ex | 23 | ||||
| -rw-r--r-- | lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex | 5 | ||||
| -rw-r--r-- | lib/pleroma/web/plugs/http_signature_plug.ex | 53 |
3 files changed, 64 insertions, 17 deletions
diff --git a/lib/pleroma/signature.ex b/lib/pleroma/signature.ex index dbe6fd209..ff0c56856 100644 --- a/lib/pleroma/signature.ex +++ b/lib/pleroma/signature.ex @@ -10,17 +10,14 @@ defmodule Pleroma.Signature do alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub + @known_suffixes ["/publickey", "/main-key"] + def key_id_to_actor_id(key_id) do uri = - URI.parse(key_id) + key_id + |> URI.parse() |> Map.put(:fragment, nil) - - uri = - if not is_nil(uri.path) and String.ends_with?(uri.path, "/publickey") do - Map.put(uri, :path, String.replace(uri.path, "/publickey", "")) - else - uri - end + |> remove_suffix(@known_suffixes) maybe_ap_id = URI.to_string(uri) @@ -36,6 +33,16 @@ defmodule Pleroma.Signature do end end + defp remove_suffix(uri, [test | rest]) do + if not is_nil(uri.path) and String.ends_with?(uri.path, test) do + Map.put(uri, :path, String.replace(uri.path, test, "")) + else + remove_suffix(uri, rest) + end + end + + defp remove_suffix(uri, []), do: uri + def fetch_public_key(conn) do with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn), {:ok, actor_id} <- key_id_to_actor_id(kid), diff --git a/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex b/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex index 5647156f5..2670e3f17 100644 --- a/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex +++ b/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex @@ -63,7 +63,10 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.ArticleNotePageValidator do defp fix_replies(%{"replies" => %{"items" => replies}} = data) when is_list(replies), do: Map.put(data, "replies", replies) - defp fix_replies(%{"replies" => replies} = data) when is_bitstring(replies), + # TODO: Pleroma does not have any support for Collections at the moment. + # If the `replies` field is not something the ObjectID validator can handle, + # the activity/object would be rejected, which is bad behavior. + defp fix_replies(%{"replies" => replies} = data) when not is_list(replies), do: Map.drop(data, ["replies"]) defp fix_replies(data), do: data diff --git a/lib/pleroma/web/plugs/http_signature_plug.ex b/lib/pleroma/web/plugs/http_signature_plug.ex index d023754a6..4bf325218 100644 --- a/lib/pleroma/web/plugs/http_signature_plug.ex +++ b/lib/pleroma/web/plugs/http_signature_plug.ex @@ -25,21 +25,58 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do end end + defp validate_signature(conn, request_target) do + # Newer drafts for HTTP signatures now use @request-target instead of the + # old (request-target). We'll now support both for incoming signatures. + conn = + conn + |> put_req_header("(request-target)", request_target) + |> put_req_header("@request-target", request_target) + + HTTPSignatures.validate_conn(conn) + end + + defp validate_signature(conn) do + # This (request-target) is non-standard, but many implementations do it + # this way due to a misinterpretation of + # https://datatracker.ietf.org/doc/html/draft-cavage-http-signatures-06 + # "path" was interpreted as not having the query, though later examples + # show that it must be the absolute path + query. This behavior is kept to + # make sure most software (Pleroma itself, Mastodon, and probably others) + # do not break. + request_target = String.downcase("#{conn.method}") <> " #{conn.request_path}" + + # This is the proper way to build the @request-target, as expected by + # many HTTP signature libraries, clarified in the following draft: + # https://www.ietf.org/archive/id/draft-ietf-httpbis-message-signatures-11.html#section-2.2.6 + # It is the same as before, but containing the query part as well. + proper_target = request_target <> "?#{conn.query_string}" + + cond do + # Normal, non-standard behavior but expected by Pleroma and more. + validate_signature(conn, request_target) -> + true + + # Has query string and the previous one failed: let's try the standard. + conn.query_string != "" -> + validate_signature(conn, proper_target) + + # If there's no query string and signature fails, it's rotten. + true -> + false + end + end + defp maybe_assign_valid_signature(conn) do if has_signature_header?(conn) do - # set (request-target) header to the appropriate value - # we also replace the digest header with the one we computed - request_target = String.downcase("#{conn.method}") <> " #{conn.request_path}" - + # we replace the digest header with the one we computed in DigestPlug conn = - conn - |> put_req_header("(request-target)", request_target) - |> case do + case conn do %{assigns: %{digest: digest}} = conn -> put_req_header(conn, "digest", digest) conn -> conn end - assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn)) + assign(conn, :valid_signature, validate_signature(conn)) else Logger.debug("No signature header!") conn |