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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
defmodule Pleroma.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())
|> maybe_send_sts_header(Config.get([:http_security, :sts]))
else
conn
end
end
defp headers do
referrer_policy = Config.get([:http_security, :referrer_policy])
report_uri = Config.get([:http_security, :report_uri])
headers = [
{"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},
{"x-download-options", "noopen"},
{"content-security-policy", csp_string() <> ";"}
]
if report_uri do
report_group = %{
"group" => "csp-endpoint",
"max-age" => 10_886_400,
"endpoints" => [
%{"url" => report_uri}
]
}
headers ++ [{"reply-to", Jason.encode!(report_group)}]
else
headers
end
end
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()
report_uri = Config.get([:http_security, :report_uri])
connect_src = "connect-src 'self' #{static_url} #{websocket_url}"
connect_src =
if Pleroma.Config.get(:env) == :dev do
connect_src <> " http://localhost:3035/"
else
connect_src
end
script_src =
if Pleroma.Config.get(:env) == :dev do
"script-src 'self' 'unsafe-eval'"
else
"script-src 'self'"
end
main_part = [
"default-src 'none'",
"base-uri 'self'",
"frame-ancestors 'none'",
"img-src 'self' data: blob: https:",
"media-src 'self' https:",
"style-src 'self' 'unsafe-inline'",
"font-src 'self'",
"manifest-src 'self'",
connect_src,
script_src
]
report = if report_uri, do: ["report-uri #{report_uri}; report-to csp-endpoint"], else: []
insecure = if scheme == "https", do: ["upgrade-insecure-requests"], else: []
(main_part ++ report ++ insecure)
|> Enum.join("; ")
end
def warn_if_disabled do
unless Config.get([:http_security, :enabled]) do
Logger.warn("
.i;;;;i.
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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])
max_age_ct = Config.get([:http_security, :ct_max_age])
merge_resp_headers(conn, [
{"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"},
{"expect-ct", "enforce, max-age=#{max_age_ct}"}
])
end
defp maybe_send_sts_header(conn, _), do: conn
end
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