akkoma/lib/pleroma/plugs/csp_plug.ex
2018-11-11 06:50:28 +00:00

55 lines
1.4 KiB
Elixir

defmodule Pleroma.Plugs.CSPPlug do
alias Pleroma.Config
import Plug.Conn
def init(opts), do: opts
def call(conn, options) do
if Config.get([:csp, :enabled]) do
conn =
merge_resp_headers(conn, headers())
|> maybe_send_sts_header(Config.get([:csp, :sts]))
else
conn
end
end
defp headers do
[
{"x-xss-protection", "1; mode=block"},
{"x-permitted-cross-domain-policies", "none"},
{"x-frame-options", "DENY"},
{"x-content-type-options", "nosniff"},
{"referrer-policy", "same-origin"},
{"x-download-options", "noopen"},
{"content-security-policy", csp_string() <> ";"}
]
end
defp csp_string do
[
"default-src 'none'",
"base-uri 'self'",
"form-action *",
"frame-ancestors 'none'",
"img-src 'self' data: https:",
"media-src 'self' https:",
"style-src 'self' 'unsafe-inline'",
"font-src 'self'",
"script-src 'self'",
"connect-src 'self' " <> String.replace(Pleroma.Web.Endpoint.static_url(), "http", "ws"),
"upgrade-insecure-requests"
]
|> Enum.join("; ")
end
defp maybe_send_sts_header(conn, true) do
max_age = Config.get([:csp, :sts_max_age])
merge_resp_headers(conn, [
{"strict-transport-security", "max-age=#{max_age}; includeSubDomains"}
])
end
defp maybe_send_sts_header(conn, _), do: conn
end