git.squeep.com Git - akkoma/blob - lib/pleroma/plugs/http_security_plug.ex

   1 defmodule Pleroma.Plugs.HTTPSecurityPlug do
   2   alias Pleroma.Config
   3   import Plug.Conn
   4
   5   def init(opts), do: opts
   6
   7   def call(conn, options) do
   8     if Config.get([:http_security, :enabled]) do
   9       conn =
  10         merge_resp_headers(conn, headers())
  11         |> maybe_send_sts_header(Config.get([:http_security, :sts]))
  12     else
  13       conn
  14     end
  15   end
  16
  17   defp headers do
  18     [
  19       {"x-xss-protection", "1; mode=block"},
  20       {"x-permitted-cross-domain-policies", "none"},
  21       {"x-frame-options", "DENY"},
  22       {"x-content-type-options", "nosniff"},
  23       {"referrer-policy", "same-origin"},
  24       {"x-download-options", "noopen"},
  25       {"content-security-policy", csp_string() <> ";"}
  26     ]
  27   end
  28
  29   defp csp_string do
  30     [
  31       "default-src 'none'",
  32       "base-uri 'self'",
  33       "form-action *",
  34       "frame-ancestors 'none'",
  35       "img-src 'self' data: https:",
  36       "media-src 'self' https:",
  37       "style-src 'self' 'unsafe-inline'",
  38       "font-src 'self'",
  39       "script-src 'self'",
  40       "connect-src 'self' " <> String.replace(Pleroma.Web.Endpoint.static_url(), "http", "ws"),
  41       "upgrade-insecure-requests"
  42     ]
  43     |> Enum.join("; ")
  44   end
  45
  46   defp maybe_send_sts_header(conn, true) do
  47     max_age_sts = Config.get([:http_security, :sts_max_age])
  48     max_age_ct = Config.get([:http_security, :ct_max_age])
  49
  50     merge_resp_headers(conn, [
  51       {"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"},
  52       {"expect-ct", "enforce, max-age=#{max_age_ct}"}
  53     ])
  54   end
  55
  56   defp maybe_send_sts_header(conn, _), do: conn
  57 end