237 lines
6.8 KiB
Elixir
237 lines
6.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Salmon do
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@httpoison Application.get_env(:pleroma, :httpoison)
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use Bitwise
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alias Pleroma.Instances
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alias Pleroma.Web.XML
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alias Pleroma.Web.OStatus.ActivityRepresenter
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alias Pleroma.User
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require Logger
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def decode(salmon) do
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doc = XML.parse_document(salmon)
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{:xmlObj, :string, data} = :xmerl_xpath.string('string(//me:data[1])', doc)
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{:xmlObj, :string, sig} = :xmerl_xpath.string('string(//me:sig[1])', doc)
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{:xmlObj, :string, alg} = :xmerl_xpath.string('string(//me:alg[1])', doc)
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{:xmlObj, :string, encoding} = :xmerl_xpath.string('string(//me:encoding[1])', doc)
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{:xmlObj, :string, type} = :xmerl_xpath.string('string(//me:data[1]/@type)', doc)
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{:ok, data} = Base.url_decode64(to_string(data), ignore: :whitespace)
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{:ok, sig} = Base.url_decode64(to_string(sig), ignore: :whitespace)
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alg = to_string(alg)
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encoding = to_string(encoding)
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type = to_string(type)
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[data, type, encoding, alg, sig]
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end
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def fetch_magic_key(salmon) do
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with [data, _, _, _, _] <- decode(salmon),
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doc <- XML.parse_document(data),
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uri when not is_nil(uri) <- XML.string_from_xpath("/entry/author[1]/uri", doc),
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{:ok, public_key} <- User.get_public_key_for_ap_id(uri),
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magic_key <- encode_key(public_key) do
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{:ok, magic_key}
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end
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end
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def decode_and_validate(magickey, salmon) do
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[data, type, encoding, alg, sig] = decode(salmon)
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signed_text =
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[data, type, encoding, alg]
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|> Enum.map(&Base.url_encode64/1)
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|> Enum.join(".")
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key = decode_key(magickey)
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verify = :public_key.verify(signed_text, :sha256, sig, key)
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if verify do
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{:ok, data}
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else
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:error
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end
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end
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def decode_key("RSA." <> magickey) do
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make_integer = fn bin ->
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list = :erlang.binary_to_list(bin)
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Enum.reduce(list, 0, fn el, acc -> acc <<< 8 ||| el end)
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end
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[modulus, exponent] =
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magickey
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|> String.split(".")
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|> Enum.map(fn n -> Base.url_decode64!(n, padding: false) end)
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|> Enum.map(make_integer)
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{:RSAPublicKey, modulus, exponent}
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end
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def encode_key({:RSAPublicKey, modulus, exponent}) do
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modulus_enc = :binary.encode_unsigned(modulus) |> Base.url_encode64()
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exponent_enc = :binary.encode_unsigned(exponent) |> Base.url_encode64()
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"RSA.#{modulus_enc}.#{exponent_enc}"
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end
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# Native generation of RSA keys is only available since OTP 20+ and in default build conditions
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# We try at compile time to generate natively an RSA key otherwise we fallback on the old way.
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try do
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_ = :public_key.generate_key({:rsa, 2048, 65537})
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def generate_rsa_pem do
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key = :public_key.generate_key({:rsa, 2048, 65537})
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entry = :public_key.pem_entry_encode(:RSAPrivateKey, key)
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pem = :public_key.pem_encode([entry]) |> String.trim_trailing()
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{:ok, pem}
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end
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rescue
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_ ->
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def generate_rsa_pem do
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port = Port.open({:spawn, "openssl genrsa"}, [:binary])
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{:ok, pem} =
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receive do
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{^port, {:data, pem}} -> {:ok, pem}
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end
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Port.close(port)
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if Regex.match?(~r/RSA PRIVATE KEY/, pem) do
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{:ok, pem}
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else
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:error
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end
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end
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end
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def keys_from_pem(pem) do
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[private_key_code] = :public_key.pem_decode(pem)
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private_key = :public_key.pem_entry_decode(private_key_code)
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{:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} = private_key
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public_key = {:RSAPublicKey, modulus, exponent}
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{:ok, private_key, public_key}
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end
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def encode(private_key, doc) do
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type = "application/atom+xml"
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encoding = "base64url"
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alg = "RSA-SHA256"
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signed_text =
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[doc, type, encoding, alg]
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|> Enum.map(&Base.url_encode64/1)
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|> Enum.join(".")
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signature =
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signed_text
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|> :public_key.sign(:sha256, private_key)
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|> to_string
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|> Base.url_encode64()
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doc_base64 =
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doc
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|> Base.url_encode64()
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# Don't need proper xml building, these strings are safe to leave unescaped
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salmon = """
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<?xml version="1.0" encoding="UTF-8"?>
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<me:env xmlns:me="http://salmon-protocol.org/ns/magic-env">
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<me:data type="application/atom+xml">#{doc_base64}</me:data>
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<me:encoding>#{encoding}</me:encoding>
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<me:alg>#{alg}</me:alg>
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<me:sig>#{signature}</me:sig>
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</me:env>
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"""
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{:ok, salmon}
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end
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def remote_users(%{data: %{"to" => to} = data}) do
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to = to ++ (data["cc"] || [])
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to
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|> Enum.map(fn id -> User.get_cached_by_ap_id(id) end)
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|> Enum.filter(fn user -> user && !user.local end)
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end
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# push an activity to remote accounts
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#
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def send_to_user(%{info: %{salmon: salmon}}, feed, poster),
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do: send_to_user(salmon, feed, poster)
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def send_to_user(url, feed, poster) when is_binary(url) do
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with {:ok, %{status: code}} when code in 200..299 <-
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poster.(
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url,
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feed,
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[
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{"Content-Type", "application/magic-envelope+xml"},
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{"referer", Pleroma.Web.Endpoint.url()}
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]
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) do
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Instances.set_reachable(url)
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Logger.debug(fn -> "Pushed to #{url}, code #{code}" end)
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:ok
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else
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e ->
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Instances.set_unreachable(url)
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Logger.debug(fn -> "Pushing Salmon to #{url} failed, #{inspect(e)}" end)
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:error
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end
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end
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def send_to_user(_, _, _), do: :noop
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@supported_activities [
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"Create",
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"Follow",
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"Like",
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"Announce",
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"Undo",
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"Delete"
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]
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@doc """
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Publishes an activity to remote accounts
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"""
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@spec publish(User.t(), Pleroma.Activity.t(), Pleroma.HTTP.t()) :: none
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def publish(user, activity, poster \\ &@httpoison.post/3)
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def publish(%{info: %{keys: keys}} = user, %{data: %{"type" => type}} = activity, poster)
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when type in @supported_activities do
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feed = ActivityRepresenter.to_simple_form(activity, user, true)
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if feed do
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feed =
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ActivityRepresenter.wrap_with_entry(feed)
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|> :xmerl.export_simple(:xmerl_xml)
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|> to_string
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{:ok, private, _} = keys_from_pem(keys)
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{:ok, feed} = encode(private, feed)
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remote_users = remote_users(activity)
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salmon_urls = Enum.map(remote_users, & &1.info.salmon)
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reachable_salmon_urls = Instances.filter_reachable(salmon_urls)
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remote_users
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|> Enum.filter(&(&1.info.salmon in reachable_salmon_urls))
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|> Enum.each(fn remote_user ->
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Logger.debug(fn -> "Sending Salmon to #{remote_user.ap_id}" end)
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Pleroma.Web.Federator.enqueue(:publish_single_salmon, {remote_user, feed, poster})
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end)
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end
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end
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def publish(%{id: id}, _, _), do: Logger.debug(fn -> "Keys missing for user #{id}" end)
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end
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