144 lines
4.3 KiB
Elixir
144 lines
4.3 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Mobilizon.Web.Plugs.HTTPSecurityPlug do
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@moduledoc """
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A plug to setup some HTTP security-related headers, like CSP
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"""
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alias Mobilizon.Config
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import Plug.Conn
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require Logger
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@spec init(any()) :: any()
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def init(opts), do: opts
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@spec call(Plug.Conn.t(), Keyword.t()) :: Plug.Conn.t()
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def call(conn, options \\ []) do
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if Config.get([:http_security, :enabled]) do
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conn
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|> merge_resp_headers(headers(options))
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|> maybe_send_sts_header(Config.get([:http_security, :sts], false))
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else
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conn
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end
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end
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@spec headers(Keyword.t()) :: list({String.t(), String.t()})
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defp headers(options) do
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referrer_policy =
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Keyword.get(options, :referrer_policy, Config.get([:http_security, :referrer_policy]))
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[
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{"x-xss-protection", "0"},
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{"x-frame-options", "DENY"},
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{"x-content-type-options", "nosniff"},
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{"referrer-policy", referrer_policy},
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{"content-security-policy", csp_string(options)}
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]
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end
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@static_csp_rules [
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"default-src 'none'",
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"base-uri 'self'",
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"manifest-src 'self'"
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]
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@csp_start [Enum.join(@static_csp_rules, ";") <> ";"]
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@img_src "img-src 'self' data: blob: "
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@media_src "media-src 'self' "
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# Connect-src is available for any origin (*) because of webfinger query to redirect to content
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@connect_src "connect-src 'self' * blob: "
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# unsafe-eval is because of JS issues with regenerator-runtime
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@script_src "script-src 'self' 'unsafe-eval' "
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@style_src "style-src 'self' "
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@font_src "font-src 'self' "
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@spec csp_string(Keyword.t()) :: String.t()
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defp csp_string(options) do
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scheme = Keyword.get(options, :scheme, Config.get([Pleroma.Web.Endpoint, :url])[:scheme])
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static_url = Mobilizon.Web.Endpoint.static_url()
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websocket_url = Mobilizon.Web.Endpoint.websocket_url()
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img_src = [@img_src] ++ [get_csp_config(:img_src, options)]
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media_src = [@media_src] ++ [get_csp_config(:media_src, options)]
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connect_src = [
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@connect_src,
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static_url,
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?\s,
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websocket_url,
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?\s,
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get_csp_config(:connect_src, options)
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]
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script_src =
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if Config.get(:env) == :dev do
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[@script_src, "'unsafe-inline' "]
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else
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[
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@script_src,
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"'sha256-4RS22DYeB7U14dra4KcQYxmwt5HkOInieXK1NUMBmQI=' "
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]
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end
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script_src = [script_src] ++ [get_csp_config(:script_src, options)]
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style_src =
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if Config.get(:env) == :dev, do: [@style_src | "'unsafe-inline' "], else: @style_src
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style_src = [style_src] ++ [get_csp_config(:style_src, options)]
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font_src = [@font_src] ++ [get_csp_config(:font_src, options)]
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frame_src = if Config.get(:env) == :dev, do: "frame-src 'self' ", else: "frame-src 'none' "
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frame_src = [frame_src] ++ [get_csp_config(:frame_src, options)]
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frame_ancestors =
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if Config.get(:env) == :dev, do: "frame-ancestors 'self' ", else: "frame-ancestors 'none' "
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frame_ancestors = [frame_ancestors] ++ [get_csp_config(:frame_ancestors, options)]
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insecure = if scheme == "https", do: "upgrade-insecure-requests"
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@csp_start
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|> add_csp_param(script_src)
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|> add_csp_param(style_src)
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|> add_csp_param(connect_src)
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|> add_csp_param(img_src)
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|> add_csp_param(media_src)
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|> add_csp_param(font_src)
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|> add_csp_param(frame_src)
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|> add_csp_param(frame_ancestors)
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|> add_csp_param(insecure)
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|> to_string()
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end
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@spec add_csp_param(iodata(), iodata() | nil) :: list()
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defp add_csp_param(csp_iodata, nil), do: csp_iodata
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defp add_csp_param(csp_iodata, param), do: [[param, ?;] | csp_iodata]
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@spec maybe_send_sts_header(Plug.Conn.t(), boolean()) :: Plug.Conn.t()
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defp maybe_send_sts_header(conn, true) do
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max_age_sts = Config.get([:http_security, :sts_max_age])
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merge_resp_headers(conn, [
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{"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"}
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])
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end
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defp maybe_send_sts_header(conn, false), do: conn
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@spec get_csp_config(atom(), Keyword.t()) :: iodata()
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defp get_csp_config(type, options) do
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options
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|> Keyword.get(type, Config.get([:http_security, :csp_policy, type]))
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|> Enum.join(" ")
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end
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end
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