248 lines
8 KiB
Elixir
248 lines
8 KiB
Elixir
# 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 Pleroma.Web.Plugs.HTTPSecurityPlug do
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alias Pleroma.Config
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import Plug.Conn
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require Logger
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def init(opts), do: opts
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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(conn))
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|> maybe_send_sts_header(Config.get([:http_security, :sts]))
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else
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conn
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end
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end
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def primary_frontend do
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with %{"name" => frontend} <- Config.get([:frontends, :primary]),
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available <- Config.get([:frontends, :available]),
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%{} = primary_frontend <- Map.get(available, frontend) do
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{:ok, primary_frontend}
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end
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end
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def custom_http_frontend_headers do
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with {:ok, %{"custom-http-headers" => custom_headers}} <- primary_frontend() do
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custom_headers
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else
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_ -> []
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end
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end
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@spec headers(Plug.Conn.t()) :: [{String.t(), String.t()}]
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def headers(conn) do
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referrer_policy = Config.get([:http_security, :referrer_policy])
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report_uri = Config.get([:http_security, :report_uri])
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custom_http_frontend_headers = custom_http_frontend_headers()
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headers = [
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{"x-xss-protection", "0"},
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{"x-permitted-cross-domain-policies", "none"},
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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(conn)},
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{"permissions-policy", "interest-cohort=()"}
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]
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headers =
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if custom_http_frontend_headers do
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custom_http_frontend_headers ++ headers
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else
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headers
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end
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if report_uri do
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report_group = %{
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"group" => "csp-endpoint",
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"max-age" => 10_886_400,
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"endpoints" => [
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%{"url" => report_uri}
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]
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}
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[{"report-to", Jason.encode!(report_group)} | headers]
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else
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headers
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end
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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 'none'",
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"frame-ancestors 'none'",
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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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defp csp_string(conn) do
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scheme = Config.get([Pleroma.Web.Endpoint, :url])[:scheme]
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static_url = Pleroma.Web.Endpoint.static_url()
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websocket_url = Pleroma.Web.Endpoint.websocket_url()
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report_uri = Config.get([:http_security, :report_uri])
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%{assigns: %{csp_nonce: nonce}} = conn
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nonce_tag = "nonce-" <> nonce
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img_src = "img-src 'self' data: blob:"
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media_src = "media-src 'self'"
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# Strict multimedia CSP enforcement only when MediaProxy is enabled
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{img_src, media_src} =
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if Config.get([:media_proxy, :enabled]) &&
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!Config.get([:media_proxy, :proxy_opts, :redirect_on_failure]) do
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sources = build_csp_multimedia_source_list()
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{[img_src, sources], [media_src, sources]}
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else
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{[img_src, " https:"], [media_src, " https:"]}
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end
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connect_src =
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if Config.get([:media_proxy, :enabled]) do
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sources = build_csp_multimedia_source_list()
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["connect-src 'self' ", static_url, ?\s, websocket_url, ?\s, sources]
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else
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["connect-src 'self' ", static_url, ?\s, websocket_url]
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end
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style_src = "style-src 'self' '#{nonce_tag}'"
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font_src = "font-src 'self'"
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script_src = "script-src 'self' '#{nonce_tag}'"
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script_src = if Mix.env() == :dev, do: [script_src, " 'unsafe-eval'"], else: script_src
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report = if report_uri, do: ["report-uri ", report_uri, ";report-to csp-endpoint"]
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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(img_src)
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|> add_csp_param(media_src)
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|> add_csp_param(connect_src)
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|> add_csp_param(script_src)
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|> add_csp_param(font_src)
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|> add_csp_param(style_src)
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|> add_csp_param(insecure)
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|> add_csp_param(report)
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|> :erlang.iolist_to_binary()
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end
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defp build_csp_from_whitelist([], acc), do: acc
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defp build_csp_from_whitelist([last], acc) do
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[build_csp_param_from_whitelist(last) | acc]
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end
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defp build_csp_from_whitelist([head | tail], acc) do
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build_csp_from_whitelist(tail, [[?\s, build_csp_param_from_whitelist(head)] | acc])
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end
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# TODO: use `build_csp_param/1` after removing support bare domains for media proxy whitelist
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defp build_csp_param_from_whitelist("http" <> _ = url) do
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build_csp_param(url)
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end
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defp build_csp_param_from_whitelist(url), do: url
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defp build_csp_multimedia_source_list do
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media_proxy_whitelist =
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[:media_proxy, :whitelist]
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|> Config.get()
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|> build_csp_from_whitelist([])
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captcha_method = Config.get([Pleroma.Captcha, :method])
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captcha_endpoint = Config.get([captcha_method, :endpoint])
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base_endpoints =
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[
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[:media_proxy, :base_url],
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[Pleroma.Upload, :base_url],
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[Pleroma.Uploaders.S3, :public_endpoint]
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]
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|> Enum.map(&Config.get/1)
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[captcha_endpoint | base_endpoints]
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|> Enum.map(&build_csp_param/1)
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|> Enum.reduce([], &add_source(&2, &1))
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|> add_source(media_proxy_whitelist)
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end
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defp add_source(iodata, nil), do: iodata
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defp add_source(iodata, []), do: iodata
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defp add_source(iodata, source), do: [[?\s, source] | iodata]
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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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defp build_csp_param(nil), do: nil
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defp build_csp_param(url) when is_binary(url) do
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%{host: host, scheme: scheme} = URI.parse(url)
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if scheme do
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[scheme, "://", host]
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end
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end
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def warn_if_disabled do
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unless Config.get([:http_security, :enabled]) do
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Logger.warn("
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vbv ......,i::::,,. ................. :AQY
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c6Y. .,...,::::,,..:t0@@QY. ................ :8bi
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:6S. ..,,...,:::,,,..EMMMMMMI. ............... .;bZ,
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:6o, .,,,,..:::,,,..i#MMMMMM#v................. YW2.
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.n8i ..,,,,,,,::,,,,.. tMMMMM@C:.................. .1Wn
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7Uc. .:::,,,,,::,,,,.. i1t;,..................... .UEi
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v97,......... .voC.
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izAotX7777777777777777777777777777777777777777Y7n92:
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.;CoIIIIIUAA666666699999ZZZZZZZZZZZZZZZZZZZZ6ov.
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HTTP Security is disabled. Please re-enable it to prevent users from attacking
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your instance and your users via malicious posts:
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config :pleroma, :http_security, enabled: true
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")
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end
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end
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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; preload"}
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])
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end
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defp maybe_send_sts_header(conn, _), do: conn
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end
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