117 lines
3.3 KiB
Elixir
117 lines
3.3 KiB
Elixir
# Portions of this file are derived from Pleroma:
|
|
# Pleroma: A lightweight social networking server
|
|
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
|
|
# SPDX-License-Identifier: AGPL-3.0-only
|
|
|
|
defmodule Mobilizon.Web.Plugs.HTTPSecurityPlug do
|
|
@moduledoc """
|
|
A plug to setup some HTTP security-related headers, like CSP
|
|
"""
|
|
|
|
alias Mobilizon.Config
|
|
import Plug.Conn
|
|
|
|
require Logger
|
|
|
|
def init(opts), do: opts
|
|
|
|
def call(conn, _options) do
|
|
if Config.get([:http_security, :enabled]) do
|
|
conn
|
|
|> merge_resp_headers(headers())
|
|
|> maybe_send_sts_header(Config.get([:http_security, :sts]))
|
|
else
|
|
conn
|
|
end
|
|
end
|
|
|
|
defp headers do
|
|
referrer_policy = Config.get([:http_security, :referrer_policy])
|
|
|
|
[
|
|
{"referrer-policy", referrer_policy},
|
|
{"content-security-policy", csp_string()}
|
|
]
|
|
end
|
|
|
|
@static_csp_rules [
|
|
"default-src 'none'",
|
|
"base-uri 'self'",
|
|
"manifest-src 'self'"
|
|
]
|
|
|
|
@csp_start [Enum.join(@static_csp_rules, ";") <> ";"]
|
|
|
|
defp csp_string do
|
|
scheme = Config.get([Pleroma.Web.Endpoint, :url])[:scheme]
|
|
static_url = Mobilizon.Web.Endpoint.static_url()
|
|
websocket_url = Mobilizon.Web.Endpoint.websocket_url()
|
|
|
|
img_src =
|
|
["img-src 'self' data: blob: "] ++ Config.get([:http_security, :csp_policy, :img_src])
|
|
|
|
media_src = ["media-src 'self' "] ++ Config.get([:http_security, :csp_policy, :media_src])
|
|
|
|
connect_src =
|
|
["connect-src 'self' blob: ", static_url, ?\s, websocket_url] ++
|
|
Config.get([:http_security, :csp_policy, :connect_src])
|
|
|
|
script_src =
|
|
if Config.get(:env) == :dev do
|
|
"script-src 'self' 'unsafe-eval' 'unsafe-inline' "
|
|
else
|
|
"script-src 'self' "
|
|
end
|
|
|
|
script_src = [script_src] ++ Config.get([:http_security, :csp_policy, :script_src])
|
|
|
|
style_src =
|
|
if Config.get(:env) == :dev do
|
|
"style-src 'self' 'unsafe-inline' "
|
|
else
|
|
"style-src 'self' "
|
|
end
|
|
|
|
style_src = [style_src] ++ Config.get([:http_security, :csp_policy, :style_src])
|
|
|
|
font_src = ["font-src 'self' "] ++ Config.get([:http_security, :csp_policy, :font_src])
|
|
|
|
frame_src = if Config.get(:env) == :dev, do: "frame-src 'self' ", else: "frame-src 'none' "
|
|
frame_src = [frame_src] ++ Config.get([:http_security, :csp_policy, :frame_src])
|
|
|
|
frame_ancestors =
|
|
if Config.get(:env) == :dev, do: "frame-ancestors 'self' ", else: "frame-ancestors 'none' "
|
|
|
|
frame_ancestors =
|
|
[frame_ancestors] ++ Config.get([:http_security, :csp_policy, :frame_ancestors])
|
|
|
|
insecure = if scheme == "https", do: "upgrade-insecure-requests"
|
|
|
|
@csp_start
|
|
|> add_csp_param(script_src)
|
|
|> add_csp_param(style_src)
|
|
|> add_csp_param(connect_src)
|
|
|> add_csp_param(img_src)
|
|
|> add_csp_param(media_src)
|
|
|> add_csp_param(font_src)
|
|
|> add_csp_param(frame_src)
|
|
|> add_csp_param(frame_ancestors)
|
|
|> add_csp_param(insecure)
|
|
|> :erlang.iolist_to_binary()
|
|
end
|
|
|
|
defp add_csp_param(csp_iodata, nil), do: csp_iodata
|
|
|
|
defp add_csp_param(csp_iodata, param), do: [[param, ?;] | csp_iodata]
|
|
|
|
defp maybe_send_sts_header(conn, true) do
|
|
max_age_sts = Config.get([:http_security, :sts_max_age])
|
|
|
|
merge_resp_headers(conn, [
|
|
{"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"}
|
|
])
|
|
end
|
|
|
|
defp maybe_send_sts_header(conn, _), do: conn
|
|
end
|