252 lines
8 KiB
Elixir
252 lines
8 KiB
Elixir
# Pleroma: A lightweight social networking server
|
|
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
|
|
# SPDX-License-Identifier: AGPL-3.0-only
|
|
|
|
defmodule Pleroma.Web.Plugs.HTTPSecurityPlug do
|
|
alias Pleroma.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(conn))
|
|
|> maybe_send_sts_header(Config.get([:http_security, :sts]))
|
|
else
|
|
conn
|
|
end
|
|
end
|
|
|
|
def primary_frontend do
|
|
with %{"name" => frontend} <- Config.get([:frontends, :primary]),
|
|
available <- Config.get([:frontends, :available]),
|
|
%{} = primary_frontend <- Map.get(available, frontend) do
|
|
{:ok, primary_frontend}
|
|
end
|
|
end
|
|
|
|
def custom_http_frontend_headers do
|
|
with {:ok, %{"custom-http-headers" => custom_headers}} <- primary_frontend() do
|
|
custom_headers
|
|
else
|
|
_ -> []
|
|
end
|
|
end
|
|
|
|
@spec headers(Plug.Conn.t()) :: [{String.t(), String.t()}]
|
|
def headers(conn) do
|
|
referrer_policy = Config.get([:http_security, :referrer_policy])
|
|
report_uri = Config.get([:http_security, :report_uri])
|
|
custom_http_frontend_headers = custom_http_frontend_headers()
|
|
|
|
headers = [
|
|
{"x-xss-protection", "0"},
|
|
{"x-permitted-cross-domain-policies", "none"},
|
|
{"x-frame-options", "DENY"},
|
|
{"x-content-type-options", "nosniff"},
|
|
{"referrer-policy", referrer_policy},
|
|
{"content-security-policy", csp_string(conn)},
|
|
{"permissions-policy", "interest-cohort=()"}
|
|
]
|
|
|
|
headers =
|
|
if custom_http_frontend_headers do
|
|
custom_http_frontend_headers ++ headers
|
|
else
|
|
headers
|
|
end
|
|
|
|
if report_uri do
|
|
report_group = %{
|
|
"group" => "csp-endpoint",
|
|
"max-age" => 10_886_400,
|
|
"endpoints" => [
|
|
%{"url" => report_uri}
|
|
]
|
|
}
|
|
|
|
[{"report-to", Jason.encode!(report_group)} | headers]
|
|
else
|
|
headers
|
|
end
|
|
end
|
|
|
|
static_csp_rules = [
|
|
"default-src 'none'",
|
|
"base-uri 'none'",
|
|
"frame-ancestors 'none'",
|
|
"manifest-src 'self'"
|
|
]
|
|
|
|
@csp_start [Enum.join(static_csp_rules, ";") <> ";"]
|
|
|
|
defp csp_string(conn) do
|
|
scheme = Config.get([Pleroma.Web.Endpoint, :url])[:scheme]
|
|
static_url = Pleroma.Web.Endpoint.static_url()
|
|
websocket_url = Pleroma.Web.Endpoint.websocket_url()
|
|
report_uri = Config.get([:http_security, :report_uri])
|
|
%{assigns: %{csp_nonce: nonce}} = conn
|
|
nonce_tag = "nonce-" <> nonce
|
|
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
|
|
|
|
connect_src =
|
|
if Config.get([:media_proxy, :enabled]) do
|
|
sources = build_csp_multimedia_source_list()
|
|
["connect-src 'self' blob: ", static_url, ?\s, websocket_url, ?\s, sources]
|
|
else
|
|
["connect-src 'self' blob: ", static_url, ?\s, websocket_url]
|
|
end
|
|
|
|
style_src = "style-src 'self' '#{nonce_tag}'"
|
|
font_src = "font-src 'self' '#{nonce_tag}' data:"
|
|
|
|
script_src =
|
|
if Config.get(:env) == :dev do
|
|
"script-src 'self' 'unsafe-eval' '#{nonce_tag}'"
|
|
else
|
|
"script-src 'self' '#{nonce_tag}'"
|
|
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(font_src)
|
|
|> add_csp_param(style_src)
|
|
|> add_csp_param(insecure)
|
|
|> add_csp_param(report)
|
|
|> :erlang.iolist_to_binary()
|
|
end
|
|
|
|
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
|
|
|
|
defp add_csp_param(csp_iodata, param), do: [[param, ?;] | csp_iodata]
|
|
|
|
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
|
|
[scheme, "://", host]
|
|
end
|
|
end
|
|
|
|
def warn_if_disabled do
|
|
unless Config.get([:http_security, :enabled]) do
|
|
Logger.warn("
|
|
.i;;;;i.
|
|
iYcviii;vXY:
|
|
.YXi .i1c.
|
|
.YC. . in7.
|
|
.vc. ...... ;1c.
|
|
i7, .. .;1;
|
|
i7, .. ... .Y1i
|
|
,7v .6MMM@; .YX,
|
|
.7;. ..IMMMMMM1 :t7.
|
|
.;Y. ;$MMMMMM9. :tc.
|
|
vY. .. .nMMM@MMU. ;1v.
|
|
i7i ... .#MM@M@C. .....:71i
|
|
it: .... $MMM@9;.,i;;;i,;tti
|
|
:t7. ..... 0MMMWv.,iii:::,,;St.
|
|
.nC. ..... IMMMQ..,::::::,.,czX.
|
|
.ct: ....... .ZMMMI..,:::::::,,:76Y.
|
|
c2: ......,i..Y$M@t..:::::::,,..inZY
|
|
vov ......:ii..c$MBc..,,,,,,,,,,..iI9i
|
|
i9Y ......iii:..7@MA,..,,,,,,,,,....;AA:
|
|
iIS. ......:ii::..;@MI....,............;Ez.
|
|
.I9. ......:i::::...8M1..................C0z.
|
|
.z9; ......:i::::,.. .i:...................zWX.
|
|
vbv ......,i::::,,. ................. :AQY
|
|
c6Y. .,...,::::,,..:t0@@QY. ................ :8bi
|
|
:6S. ..,,...,:::,,,..EMMMMMMI. ............... .;bZ,
|
|
:6o, .,,,,..:::,,,..i#MMMMMM#v................. YW2.
|
|
.n8i ..,,,,,,,::,,,,.. tMMMMM@C:.................. .1Wn
|
|
7Uc. .:::,,,,,::,,,,.. i1t;,..................... .UEi
|
|
7C...::::::::::::,,,,.. .................... vSi.
|
|
;1;...,,::::::,......... .................. Yz:
|
|
v97,......... .voC.
|
|
izAotX7777777777777777777777777777777777777777Y7n92:
|
|
.;CoIIIIIUAA666666699999ZZZZZZZZZZZZZZZZZZZZ6ov.
|
|
|
|
HTTP Security is disabled. Please re-enable it to prevent users from attacking
|
|
your instance and your users via malicious posts:
|
|
|
|
config :pleroma, :http_security, enabled: true
|
|
")
|
|
end
|
|
end
|
|
|
|
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; preload"}
|
|
])
|
|
end
|
|
|
|
defp maybe_send_sts_header(conn, _), do: conn
|
|
end
|