akkoma/lib/pleroma/plugs/http_security_plug.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Plugs.HTTPSecurityPlug do
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alias Pleroma.Config
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import Plug.Conn
def init(opts), do: opts
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def call(conn, _options) do
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if Config.get([:http_security, :enabled]) do
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conn
|> merge_resp_headers(headers())
|> maybe_send_sts_header(Config.get([:http_security, :sts]))
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else
conn
end
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end
defp headers do
referrer_policy = Config.get([:http_security, :referrer_policy])
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[
{"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},
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{"x-download-options", "noopen"},
{"content-security-policy", csp_string() <> ";"}
]
end
defp csp_string do
protocol = Config.get([Pleroma.Web.Endpoint, :protocol])
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[
"default-src 'none'",
"base-uri 'self'",
"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"),
"manifest-src 'self'",
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if protocol == "https" do
"upgrade-insecure-requests"
end
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]
|> Enum.join("; ")
end
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defp maybe_send_sts_header(conn, true) do
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max_age_sts = Config.get([:http_security, :sts_max_age])
max_age_ct = Config.get([:http_security, :ct_max_age])
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merge_resp_headers(conn, [
{"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"},
{"expect-ct", "enforce, max-age=#{max_age_ct}"}
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])
end
defp maybe_send_sts_header(conn, _), do: conn
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end