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92 lines
2.7 KiB
Elixir
92 lines
2.7 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/plugs/http_signature.ex
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defmodule Mobilizon.Web.Plugs.HTTPSignatures do
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@moduledoc """
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Plug to check HTTP Signatures on every incoming request
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"""
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import Plug.Conn, only: [get_req_header: 2, put_req_header: 3, assign: 3]
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require Logger
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def init(options) do
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options
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end
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@spec call(Plug.Conn.t(), any) :: Plug.Conn.t()
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def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
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conn
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end
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def call(conn, _opts) do
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signature = conn |> get_req_header("signature") |> List.first()
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if is_nil(signature) do
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Logger.debug("No signature header!")
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conn
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else
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# set (request-target) header to the appropriate value
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# we also replace the digest header with the one we computed
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conn =
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conn
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|> put_req_header(
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"(request-target)",
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String.downcase("#{conn.method}") <> " #{conn.request_path}"
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)
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|> maybe_put_digest_header()
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signature_valid =
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try do
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HTTPSignatures.validate_conn(conn)
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rescue
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# Because if the actor is not found in
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# Mobilizon.Federation.HTTPSignatures.Signature.get_public_key_for_url/1
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# we return an empty string as key,
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# to give an extra-chance of fetching new actor keys
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# and :public_key.verify doesn't like this
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ArgumentError -> false
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end
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Logger.debug("Is signature valid ? #{inspect(signature_valid)}")
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date_valid = date_valid?(conn)
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Logger.debug("Is date valid ? #{inspect(date_valid)}")
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assign(conn, :valid_signature, signature_valid && date_valid)
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end
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end
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defp maybe_put_digest_header(%Plug.Conn{assigns: %{digest: digest}} = conn),
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do: put_req_header(conn, "digest", digest)
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defp maybe_put_digest_header(%Plug.Conn{} = conn), do: conn
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@spec date_valid?(Plug.Conn.t()) :: boolean()
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defp date_valid?(conn) do
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date = conn |> get_req_header("date") |> List.first()
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if is_nil(date) do
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false
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else
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case Timex.parse(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT") do
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{:ok, %NaiveDateTime{} = date} ->
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date
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|> DateTime.from_naive!("Etc/UTC")
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|> date_diff_ok?()
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{:ok, %DateTime{} = date} ->
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date_diff_ok?(date)
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{:error, _err} ->
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false
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end
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end
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end
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@spec date_diff_ok?(DateTime.t()) :: boolean()
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defp date_diff_ok?(%DateTime{} = date) do
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DateTime.diff(date, DateTime.utc_now()) <= 12 * 3600 &&
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DateTime.diff(date, DateTime.utc_now()) >= -12 * 3600
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end
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end
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