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My custom branche(s) on git.pleroma.social/pleroma/pleroma git clone https://hacktivis.me/git/pleroma.git
commit: a94cf2ad4ff523f72d03a9bf76ca9ec6b242c79b
parent 9da4f89b7b8c59947a812b95aeafd4f8efaf6a8a
Author: Haelwenn <contact+git.pleroma.social@hacktivis.me>
Date:   Sun,  3 Sep 2023 09:09:27 +0000

Merge branch 'check-attachment-attribution' into 'develop'

Prevent users from attaching other users' attachments

See merge request pleroma/pleroma!3947

Diffstat:

Achangelog.d/check-attachment-attribution.security1+
Mlib/pleroma/scheduled_activity.ex6+++++-
Mlib/pleroma/web/common_api.ex12++++++++++++
Mlib/pleroma/web/common_api/activity_draft.ex2+-
Mlib/pleroma/web/common_api/utils.ex27++++++++++++++-------------
Mtest/pleroma/web/common_api/utils_test.exs43+++++++++++++++++++++++++++++--------------
Mtest/pleroma/web/common_api_test.exs18++++++++++++++++++
Mtest/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs2+-
Mtest/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs2+-
9 files changed, 82 insertions(+), 31 deletions(-)

diff --git a/changelog.d/check-attachment-attribution.security b/changelog.d/check-attachment-attribution.security @@ -0,0 +1 @@ +CommonAPI: Prevent users from accessing media of other users by creating a status with reused attachment ID diff --git a/lib/pleroma/scheduled_activity.ex b/lib/pleroma/scheduled_activity.ex @@ -40,7 +40,11 @@ defmodule Pleroma.ScheduledActivity do %{changes: %{params: %{"media_ids" => media_ids} = params}} = changeset ) when is_list(media_ids) do - media_attachments = Utils.attachments_from_ids(%{media_ids: media_ids}) + media_attachments = + Utils.attachments_from_ids( + %{media_ids: media_ids}, + User.get_cached_by_id(changeset.data.user_id) + ) params = params diff --git a/lib/pleroma/web/common_api.ex b/lib/pleroma/web/common_api.ex @@ -33,6 +33,7 @@ defmodule Pleroma.Web.CommonAPI do def post_chat_message(%User{} = user, %User{} = recipient, content, opts \\ []) do with maybe_attachment <- opts[:media_id] && Object.get_by_id(opts[:media_id]), + :ok <- validate_chat_attachment_attribution(maybe_attachment, user), :ok <- validate_chat_content_length(content, !!maybe_attachment), {_, {:ok, chat_message_data, _meta}} <- {:build_object, @@ -71,6 +72,17 @@ defmodule Pleroma.Web.CommonAPI do text end + defp validate_chat_attachment_attribution(nil, _), do: :ok + + defp validate_chat_attachment_attribution(attachment, user) do + with :ok <- Object.authorize_access(attachment, user) do + :ok + else + e -> + e + end + end + defp validate_chat_content_length(_, true), do: :ok defp validate_chat_content_length(nil, false), do: {:error, :no_content} diff --git a/lib/pleroma/web/common_api/activity_draft.ex b/lib/pleroma/web/common_api/activity_draft.ex @@ -111,7 +111,7 @@ defmodule Pleroma.Web.CommonAPI.ActivityDraft do end defp attachments(%{params: params} = draft) do - attachments = Utils.attachments_from_ids(params) + attachments = Utils.attachments_from_ids(params, draft.user) draft = %__MODULE__{draft | attachments: attachments} case Utils.validate_attachments_count(attachments) do diff --git a/lib/pleroma/web/common_api/utils.ex b/lib/pleroma/web/common_api/utils.ex @@ -23,21 +23,21 @@ defmodule Pleroma.Web.CommonAPI.Utils do require Logger require Pleroma.Constants - def attachments_from_ids(%{media_ids: ids, descriptions: desc}) do - attachments_from_ids_descs(ids, desc) + def attachments_from_ids(%{media_ids: ids, descriptions: desc}, user) do + attachments_from_ids_descs(ids, desc, user) end - def attachments_from_ids(%{media_ids: ids}) do - attachments_from_ids_no_descs(ids) + def attachments_from_ids(%{media_ids: ids}, user) do + attachments_from_ids_no_descs(ids, user) end - def attachments_from_ids(_), do: [] + def attachments_from_ids(_, _), do: [] - def attachments_from_ids_no_descs([]), do: [] + def attachments_from_ids_no_descs([], _), do: [] - def attachments_from_ids_no_descs(ids) do + def attachments_from_ids_no_descs(ids, user) do Enum.map(ids, fn media_id -> - case get_attachment(media_id) do + case get_attachment(media_id, user) do %Object{data: data} -> data _ -> nil end @@ -45,22 +45,23 @@ defmodule Pleroma.Web.CommonAPI.Utils do |> Enum.reject(&is_nil/1) end - def attachments_from_ids_descs([], _), do: [] + def attachments_from_ids_descs([], _, _), do: [] - def attachments_from_ids_descs(ids, descs_str) do + def attachments_from_ids_descs(ids, descs_str, user) do {_, descs} = Jason.decode(descs_str) Enum.map(ids, fn media_id -> - with %Object{data: data} <- get_attachment(media_id) do + with %Object{data: data} <- get_attachment(media_id, user) do Map.put(data, "name", descs[media_id]) end end) |> Enum.reject(&is_nil/1) end - defp get_attachment(media_id) do + defp get_attachment(media_id, user) do with %Object{data: data} = object <- Repo.get(Object, media_id), - %{"type" => type} when type in Pleroma.Constants.upload_object_types() <- data do + %{"type" => type} when type in Pleroma.Constants.upload_object_types() <- data, + :ok <- Object.authorize_access(object, user) do object else _ -> nil diff --git a/test/pleroma/web/common_api/utils_test.exs b/test/pleroma/web/common_api/utils_test.exs @@ -586,46 +586,61 @@ defmodule Pleroma.Web.CommonAPI.UtilsTest do end end - describe "attachments_from_ids_descs/2" do + describe "attachments_from_ids_descs/3" do test "returns [] when attachment ids is empty" do - assert Utils.attachments_from_ids_descs([], "{}") == [] + assert Utils.attachments_from_ids_descs([], "{}", nil) == [] end test "returns list attachments with desc" do - object = insert(:attachment) + user = insert(:user) + object = insert(:attachment, %{user: user}) desc = Jason.encode!(%{object.id => "test-desc"}) - assert Utils.attachments_from_ids_descs(["#{object.id}", "34"], desc) == [ + assert Utils.attachments_from_ids_descs(["#{object.id}", "34"], desc, user) == [ Map.merge(object.data, %{"name" => "test-desc"}) ] end end - describe "attachments_from_ids/1" do + describe "attachments_from_ids/2" do test "returns attachments with descs" do - object = insert(:attachment) + user = insert(:user) + object = insert(:attachment, %{user: user}) desc = Jason.encode!(%{object.id => "test-desc"}) - assert Utils.attachments_from_ids(%{ - media_ids: ["#{object.id}"], - descriptions: desc - }) == [ + assert Utils.attachments_from_ids( + %{ + media_ids: ["#{object.id}"], + descriptions: desc + }, + user + ) == [ Map.merge(object.data, %{"name" => "test-desc"}) ] end test "returns attachments without descs" do - object = insert(:attachment) - assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}) == [object.data] + user = insert(:user) + object = insert(:attachment, %{user: user}) + assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}, user) == [object.data] end test "returns [] when not pass media_ids" do - assert Utils.attachments_from_ids(%{}) == [] + assert Utils.attachments_from_ids(%{}, nil) == [] + end + + test "returns [] when media_ids not belong to current user" do + user = insert(:user) + user2 = insert(:user) + + object = insert(:attachment, %{user: user}) + + assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}, user2) == [] end test "checks that the object is of upload type" do object = insert(:note) - assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}) == [] + assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}, nil) == [] end end diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs @@ -279,6 +279,24 @@ defmodule Pleroma.Web.CommonAPITest do assert {:reject, "[KeywordPolicy] Matches with rejected keyword"} == CommonAPI.post_chat_message(author, recipient, "GNO/Linux") end + + test "it reject messages with attachments not belonging to user" do + author = insert(:user) + not_author = insert(:user) + recipient = author + + attachment = insert(:attachment, %{user: not_author}) + + {:error, message} = + CommonAPI.post_chat_message( + author, + recipient, + "123", + media_id: attachment.id + ) + + assert message == :forbidden + end end describe "unblocking" do diff --git a/test/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs b/test/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs @@ -48,7 +48,7 @@ defmodule Pleroma.Web.MastodonAPI.ScheduledActivityViewTest do id: to_string(scheduled_activity.id), media_attachments: %{media_ids: [upload.id]} - |> Utils.attachments_from_ids() + |> Utils.attachments_from_ids(user) |> Enum.map(&StatusView.render("attachment.json", %{attachment: &1})), params: %{ in_reply_to_id: to_string(activity.id), diff --git a/test/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs b/test/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs @@ -24,7 +24,7 @@ defmodule Pleroma.Web.PleromaAPI.ChatMessageReferenceViewTest do filename: "an_image.jpg" } - {:ok, upload} = ActivityPub.upload(file, actor: user.ap_id) + {:ok, upload} = ActivityPub.upload(file, actor: recipient.ap_id) {:ok, activity} = CommonAPI.post_chat_message(user, recipient, "kippis :firefox:", idempotency_key: "123")