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     referrer_policy = Config.get([:http_security, :referrer_policy])
  19
  20     [
  21       {"x-xss-protection", "1; mode=block"},
  22       {"x-permitted-cross-domain-policies", "none"},
  23       {"x-frame-options", "DENY"},
  24       {"x-content-type-options", "nosniff"},
  25       {"referrer-policy", referrer_policy},
  26       {"x-download-options", "noopen"},
  27       {"content-security-policy", csp_string() <> ";"}
  28     ]
  29   end
  30
  31   defp csp_string do
  32     [
  33       "default-src 'none'",
  34       "base-uri 'self'",
  35       "form-action *",
  36       "frame-ancestors 'none'",
  37       "img-src 'self' data: https:",
  38       "media-src 'self' https:",
  39       "style-src 'self' 'unsafe-inline'",
  40       "font-src 'self'",
  41       "script-src 'self'",
  42       "connect-src 'self' " <> String.replace(Pleroma.Web.Endpoint.static_url(), "http", "ws"),
  43       "upgrade-insecure-requests"
  44     ]
  45     |> Enum.join("; ")
  46   end
  47
  48   defp maybe_send_sts_header(conn, true) do
  49     max_age_sts = Config.get([:http_security, :sts_max_age])
  50     max_age_ct = Config.get([:http_security, :ct_max_age])
  51
  52     merge_resp_headers(conn, [
  53       {"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"},
  54       {"expect-ct", "enforce, max-age=#{max_age_ct}"}
  55     ])
  56   end
  57
  58   defp maybe_send_sts_header(conn, _), do: conn
  59 end