mirror of
https://framagit.org/framasoft/mobilizon.git
synced 2024-12-22 16:03:25 +00:00
92 lines
2.7 KiB
Elixir
92 lines
2.7 KiB
Elixir
# Portions of this file are derived from Pleroma:
|
||
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
|
||
# SPDX-License-Identifier: AGPL-3.0-only
|
||
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/plugs/http_signature.ex
|
||
|
||
defmodule Mobilizon.Web.Plugs.HTTPSignatures do
|
||
@moduledoc """
|
||
Plug to check HTTP Signatures on every incoming request
|
||
"""
|
||
|
||
import Plug.Conn, only: [get_req_header: 2, put_req_header: 3, assign: 3]
|
||
|
||
require Logger
|
||
|
||
def init(options) do
|
||
options
|
||
end
|
||
|
||
@spec call(Plug.Conn.t(), any) :: Plug.Conn.t()
|
||
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
|
||
conn
|
||
end
|
||
|
||
def call(conn, _opts) do
|
||
signature = conn |> get_req_header("signature") |> List.first()
|
||
|
||
if is_nil(signature) do
|
||
Logger.debug("No signature header!")
|
||
conn
|
||
else
|
||
# set (request-target) header to the appropriate value
|
||
# we also replace the digest header with the one we computed
|
||
conn =
|
||
conn
|
||
|> put_req_header(
|
||
"(request-target)",
|
||
String.downcase("#{conn.method}") <> " #{conn.request_path}"
|
||
)
|
||
|> maybe_put_digest_header()
|
||
|
||
signature_valid =
|
||
try do
|
||
HTTPSignatures.validate_conn(conn)
|
||
rescue
|
||
# Because if the actor is not found in
|
||
# Mobilizon.Federation.HTTPSignatures.Signature.get_public_key_for_url/1
|
||
# we return an empty string as key,
|
||
# to give an extra-chance of fetching new actor keys
|
||
# and :public_key.verify doesn't like this
|
||
ArgumentError -> false
|
||
end
|
||
|
||
Logger.debug("Is signature valid ? #{inspect(signature_valid)}")
|
||
date_valid = date_valid?(conn)
|
||
Logger.debug("Is date valid ? #{inspect(date_valid)}")
|
||
assign(conn, :valid_signature, signature_valid && date_valid)
|
||
end
|
||
end
|
||
|
||
defp maybe_put_digest_header(%Plug.Conn{assigns: %{digest: digest}} = conn),
|
||
do: put_req_header(conn, "digest", digest)
|
||
|
||
defp maybe_put_digest_header(%Plug.Conn{} = conn), do: conn
|
||
|
||
@spec date_valid?(Plug.Conn.t()) :: boolean()
|
||
defp date_valid?(conn) do
|
||
date = conn |> get_req_header("date") |> List.first()
|
||
|
||
if is_nil(date) do
|
||
false
|
||
else
|
||
case Timex.parse(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT") do
|
||
{:ok, %NaiveDateTime{} = date} ->
|
||
date
|
||
|> DateTime.from_naive!("Etc/UTC")
|
||
|> date_diff_ok?()
|
||
|
||
{:ok, %DateTime{} = date} ->
|
||
date_diff_ok?(date)
|
||
|
||
{:error, _err} ->
|
||
false
|
||
end
|
||
end
|
||
end
|
||
|
||
@spec date_diff_ok?(DateTime.t()) :: boolean()
|
||
defp date_diff_ok?(%DateTime{} = date) do
|
||
DateTime.diff(date, DateTime.utc_now()) <= 12 * 3600 &&
|
||
DateTime.diff(date, DateTime.utc_now()) >= -12 * 3600
|
||
end
|
||
end
|