HTTPSignaturePlug: Add :authorized_fetch_mode_exceptions

This commit is contained in:
Haelwenn (lanodan) Monnier 2023-12-16 18:56:46 +01:00
parent f271ea6e43
commit 086ba59d03
5 changed files with 42 additions and 5 deletions

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@ -0,0 +1 @@
HTTPSignaturePlug: Add :authorized_fetch_mode_exceptions configuration

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@ -1771,6 +1771,12 @@
type: :boolean,
description: "Require HTTP signatures for AP fetches"
},
%{
key: :authorized_fetch_mode_exceptions,
type: {:list, :string},
description:
"List of IPs (CIDR format accepted) to exempt from HTTP Signatures requirement (for example to allow debugging, you shouldn't otherwise need this)"
},
%{
key: :note_replies_output_limit,
type: :integer,

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@ -279,6 +279,7 @@ Notes:
* `deny_follow_blocked`: Whether to disallow following an account that has blocked the user in question
* `sign_object_fetches`: Sign object fetches with HTTP signatures
* `authorized_fetch_mode`: Require HTTP signatures for AP fetches
* `authorized_fetch_mode_exceptions`: List of IPs (CIDR format accepted) to exempt from HTTP Signatures requirement (for example to allow debugging, you shouldn't otherwise need this)
## Pleroma.User

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@ -3,6 +3,8 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
alias Pleroma.Helpers.InetHelper
import Plug.Conn
import Phoenix.Controller, only: [get_format: 1, text: 2]
require Logger
@ -89,12 +91,20 @@ defp has_signature_header?(conn) do
defp maybe_require_signature(%{assigns: %{valid_signature: true}} = conn), do: conn
defp maybe_require_signature(conn) do
defp maybe_require_signature(%{remote_ip: remote_ip} = conn) do
if Pleroma.Config.get([:activitypub, :authorized_fetch_mode], false) do
conn
|> put_status(:unauthorized)
|> text("Request not signed")
|> halt()
exceptions =
Pleroma.Config.get([:activitypub, :authorized_fetch_mode_exceptions], [])
|> Enum.map(&InetHelper.parse_cidr/1)
if Enum.any?(exceptions, fn x -> InetCidr.contains?(x, remote_ip) end) do
conn
else
conn
|> put_status(:unauthorized)
|> text("Request not signed")
|> halt()
end
else
conn
end

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@ -81,5 +81,24 @@ test "halts the connection when `signature` header is not present", %{conn: conn
assert conn.state == :sent
assert conn.resp_body == "Request not signed"
end
test "exempts specific IPs from `authorized_fetch_mode_exceptions`", %{conn: conn} do
clear_config([:activitypub, :authorized_fetch_mode_exceptions], ["192.168.0.0/24"])
with_mock HTTPSignatures, validate_conn: fn _ -> false end do
conn =
conn
|> Map.put(:remote_ip, {192, 168, 0, 1})
|> put_req_header(
"signature",
"keyId=\"http://mastodon.example.org/users/admin#main-key"
)
|> HTTPSignaturePlug.call(%{})
assert conn.remote_ip == {192, 168, 0, 1}
assert conn.halted == false
assert called(HTTPSignatures.validate_conn(:_))
end
end
end
end