activitypub: fix possibility of spoofing by containing remote objects to the same domain as their actor
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@ -747,6 +747,7 @@ def fetch_object_from_id(id) do
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"actor" => data["attributedTo"],
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"object" => data
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},
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:ok <- Transmogrifier.contain_origin(id, params),
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{:ok, activity} <- Transmogrifier.handle_incoming(params) do
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{:ok, Object.normalize(activity.data["object"])}
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else
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@ -30,6 +30,20 @@ def get_actor(%{"actor" => actor}) when is_map(actor) do
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actor["id"]
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end
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@doc """
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Checks that an imported AP object's actor matches the domain it came from.
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"""
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def contain_origin(id, %{"actor" => actor}) do
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id_uri = URI.parse(id)
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actor_uri = URI.parse(actor)
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if id_uri.host == actor_uri.host do
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:ok
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else
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:error
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end
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end
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@doc """
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Modifies an incoming AP object (mastodon format) to our internal format.
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"""
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