Pleroma/lib/pleroma/web/plugs/http_security_plug.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.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
|> merge_resp_headers(headers())
|> maybe_send_sts_header(Config.get([:http_security, :sts]))
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else
conn
end
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end
defp headers do
referrer_policy = Config.get([:http_security, :referrer_policy])
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report_uri = Config.get([:http_security, :report_uri])
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headers = [
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{"x-xss-protection", "1; mode=block"},
{"x-permitted-cross-domain-policies", "none"},
{"x-frame-options", "DENY"},
{"x-content-type-options", "nosniff"},
{"referrer-policy", referrer_policy},
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{"x-download-options", "noopen"},
{"content-security-policy", csp_string()}
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]
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if report_uri do
report_group = %{
"group" => "csp-endpoint",
"max-age" => 10_886_400,
"endpoints" => [
%{"url" => report_uri}
]
}
[{"reply-to", Jason.encode!(report_group)} | headers]
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else
headers
end
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end
static_csp_rules = [
"default-src 'none'",
"base-uri 'self'",
"frame-ancestors 'none'",
"style-src 'self' 'unsafe-inline'",
"font-src 'self'",
"manifest-src 'self'"
]
@csp_start [Enum.join(static_csp_rules, ";") <> ";"]
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defp csp_string do
scheme = Config.get([Pleroma.Web.Endpoint, :url])[:scheme]
static_url = Pleroma.Web.Endpoint.static_url()
websocket_url = Pleroma.Web.Endpoint.websocket_url()
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report_uri = Config.get([:http_security, :report_uri])
img_src = "img-src 'self' data: blob:"
media_src = "media-src 'self'"
# Strict multimedia CSP enforcement only when MediaProxy is enabled
{img_src, media_src} =
if Config.get([:media_proxy, :enabled]) &&
!Config.get([:media_proxy, :proxy_opts, :redirect_on_failure]) do
sources = build_csp_multimedia_source_list()
{[img_src, sources], [media_src, sources]}
else
{[img_src, " https:"], [media_src, " https:"]}
end
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connect_src = ["connect-src 'self' blob: ", static_url, ?\s, websocket_url]
connect_src =
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if Config.get(:env) == :dev do
[connect_src, " http://localhost:3035/"]
else
connect_src
end
script_src =
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if Config.get(:env) == :dev do
"script-src 'self' 'unsafe-eval'"
else
"script-src 'self'"
end
report = if report_uri, do: ["report-uri ", report_uri, ";report-to csp-endpoint"]
insecure = if scheme == "https", do: "upgrade-insecure-requests"
@csp_start
|> add_csp_param(img_src)
|> add_csp_param(media_src)
|> add_csp_param(connect_src)
|> add_csp_param(script_src)
|> add_csp_param(insecure)
|> add_csp_param(report)
|> :erlang.iolist_to_binary()
end
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defp build_csp_from_whitelist([], acc), do: acc
defp build_csp_from_whitelist([last], acc) do
[build_csp_param_from_whitelist(last) | acc]
end
defp build_csp_from_whitelist([head | tail], acc) do
build_csp_from_whitelist(tail, [[?\s, build_csp_param_from_whitelist(head)] | acc])
end
# TODO: use `build_csp_param/1` after removing support bare domains for media proxy whitelist
defp build_csp_param_from_whitelist("http" <> _ = url) do
build_csp_param(url)
end
defp build_csp_param_from_whitelist(url), do: url
defp build_csp_multimedia_source_list do
media_proxy_whitelist =
[:media_proxy, :whitelist]
|> Config.get()
|> build_csp_from_whitelist([])
captcha_method = Config.get([Pleroma.Captcha, :method])
captcha_endpoint = Config.get([captcha_method, :endpoint])
base_endpoints =
[
[:media_proxy, :base_url],
[Pleroma.Upload, :base_url],
[Pleroma.Uploaders.S3, :public_endpoint]
]
|> Enum.map(&Config.get/1)
[captcha_endpoint | base_endpoints]
|> Enum.map(&build_csp_param/1)
|> Enum.reduce([], &add_source(&2, &1))
|> add_source(media_proxy_whitelist)
end
defp add_source(iodata, nil), do: iodata
defp add_source(iodata, []), do: iodata
defp add_source(iodata, source), do: [[?\s, source] | iodata]
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
defp build_csp_param(url) when is_binary(url) do
%{host: host, scheme: scheme} = URI.parse(url)
if scheme do
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[scheme, "://", host]
end
end
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def warn_if_disabled do
unless Config.get([:http_security, :enabled]) do
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Logger.warn("
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HTTP Security is disabled. Please re-enable it to prevent users from attacking
your instance and your users via malicious posts:
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config :pleroma, :http_security, enabled: true
")
end
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])
max_age_ct = Config.get([:http_security, :ct_max_age])
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merge_resp_headers(conn, [
{"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"},
{"expect-ct", "enforce, max-age=#{max_age_ct}"}
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])
end
defp maybe_send_sts_header(conn, _), do: conn
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end