# https://tools.ietf.org/html/draft-cavage-http-signatures-08
defmodule Pleroma.Web.HTTPSignatures do
+ alias Pleroma.User
+ alias Pleroma.Web.ActivityPub.ActivityPub
+
def split_signature(sig) do
default = %{"headers" => "date"}
def validate(headers, signature, public_key) do
sigstring = build_signing_string(headers, signature["headers"])
{:ok, sig} = Base.decode64(signature["signature"])
- verify = :public_key.verify(sigstring, :sha256, sig, public_key)
+ :public_key.verify(sigstring, :sha256, sig, public_key)
+ end
+
+ def validate_conn(conn) do
+ # TODO: How to get the right key and see if it is actually valid for that request.
+ # For now, fetch the key for the actor.
+ with actor_id <- conn.params["actor"],
+ {:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
+ if validate_conn(conn, public_key) do
+ true
+ else
+ # Fetch user anew and try one more time
+ with actor_id <- conn.params["actor"],
+ {:ok, _user} <- ActivityPub.make_user_from_ap_id(actor_id),
+ {:ok, public_key} <- User.get_public_key_for_ap_id(actor_id) do
+ validate_conn(conn, public_key)
+ end
+ end
+ else
+ _ -> false
+ end
end
def validate_conn(conn, public_key) do
|> Enum.map(fn (header) -> "#{header}: #{headers[header]}" end)
|> Enum.join("\n")
end
+
+ def sign(user, headers) do
+ with {:ok, %{info: %{"keys" => keys}}} <- Pleroma.Web.WebFinger.ensure_keys_present(user),
+ {:ok, private_key, _} = Pleroma.Web.Salmon.keys_from_pem(keys) do
+ sigstring = build_signing_string(headers, Map.keys(headers))
+ signature = :public_key.sign(sigstring, :sha256, private_key)
+ |> Base.encode64()
+
+ [
+ keyId: user.ap_id <> "#main-key",
+ algorithm: "rsa-sha256",
+ headers: Map.keys(headers) |> Enum.join(" "),
+ signature: signature
+ ]
+ |> Enum.map(fn({k, v}) -> "#{k}=\"#{v}\"" end)
+ |> Enum.join(",")
+ end
+ end
end