MediaController: enforced owner-only access in :show action.

Improved error response on denied access (now 403). Adjusted tests.
This commit is contained in:
Ivan Tashkinov 2020-05-18 09:51:53 +03:00
parent af9dfdce6b
commit 9b76565264
4 changed files with 33 additions and 14 deletions

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@ -138,12 +138,17 @@ def normalize(ap_id, true, options) when is_binary(ap_id) do
def normalize(_, _, _), do: nil
# Owned objects can only be mutated by their owner
def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}),
do: actor == ap_id
# Owned objects can only be accessed by their owner
def authorize_access(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}) do
if actor == ap_id do
:ok
else
{:error, :forbidden}
end
end
# Legacy objects can be mutated by anybody
def authorize_mutation(%Object{}, %User{}), do: true
# Legacy objects can be accessed by anybody
def authorize_access(%Object{}, %User{}), do: :ok
@spec get_cached_by_ap_id(String.t()) :: Object.t() | nil
def get_cached_by_ap_id(ap_id) do

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@ -20,6 +20,10 @@ def call(conn, {:error, :not_found}) do
render_error(conn, :not_found, "Record not found")
end
def call(conn, {:error, :forbidden}) do
render_error(conn, :forbidden, "Access denied")
end
def call(conn, {:error, error_message}) do
conn
|> put_status(:bad_request)

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@ -56,7 +56,7 @@ def create2(_conn, _data), do: {:error, :bad_request}
@doc "PUT /api/v1/media/:id"
def update(%{assigns: %{user: user}, body_params: %{description: description}} = conn, %{id: id}) do
with %Object{} = object <- Object.get_by_id(id),
true <- Object.authorize_mutation(object, user),
:ok <- Object.authorize_access(object, user),
{:ok, %Object{data: data}} <- Object.update_data(object, %{"name" => description}) do
attachment_data = Map.put(data, "id", object.id)
@ -66,10 +66,10 @@ def update(%{assigns: %{user: user}, body_params: %{description: description}} =
def update(conn, data), do: show(conn, data)
# TODO: clarify: is the access to non-owned objects granted intentionally?
@doc "GET /api/v1/media/:id"
def show(conn, %{id: id}) do
with %Object{data: data, id: object_id} <- Object.get_by_id(id) do
def show(%{assigns: %{user: user}} = conn, %{id: id}) do
with %Object{data: data, id: object_id} = object <- Object.get_by_id(id),
:ok <- Object.authorize_access(object, user) do
attachment_data = Map.put(data, "id", object_id)
render(conn, "attachment.json", %{attachment: attachment_data})

View File

@ -63,10 +63,9 @@ test "/api/v2/media", %{conn: conn, user: user, image: image} do
assert media["type"] == "image"
assert media["description"] == desc
assert media["id"]
object = Object.get_by_id(media["id"])
# TODO: clarify: if this EP allows access to non-owned objects, the following may be false:
assert object.data["actor"] == User.ap_id(conn.assigns[:user])
object = Object.get_by_id(media["id"])
assert object.data["actor"] == user.ap_id
end
end
@ -102,7 +101,7 @@ test "/api/v1/media/:id good request", %{conn: conn, object: object} do
end
end
describe "Get media by id" do
describe "Get media by id (/api/v1/media/:id)" do
setup do: oauth_access(["read:media"])
setup %{user: actor} do
@ -122,7 +121,7 @@ test "/api/v1/media/:id good request", %{conn: conn, object: object} do
[object: object]
end
test "/api/v1/media/:id", %{conn: conn, object: object} do
test "it returns media object when requested by owner", %{conn: conn, object: object} do
media =
conn
|> get("/api/v1/media/#{object.id}")
@ -132,5 +131,16 @@ test "/api/v1/media/:id", %{conn: conn, object: object} do
assert media["type"] == "image"
assert media["id"]
end
test "it returns 403 if media object requested by non-owner", %{object: object, user: user} do
%{conn: conn, user: other_user} = oauth_access(["read:media"])
assert object.data["actor"] == user.ap_id
refute user.id == other_user.id
conn
|> get("/api/v1/media/#{object.id}")
|> json_response(403)
end
end
end