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HTTP security plug: Harden img-src and media-src when MediaProxy is enabled

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rinpatch 2020-05-27 21:01:36 +03:00
parent 455a402c8a
commit 29ff6d414b
1 changed files with 38 additions and 3 deletions
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39
lib/pleroma/plugs/http_security_plug.ex
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@ -67,6 +67,18 @@ defp csp_string do
websocket_url = Pleroma.Web.Endpoint.websocket_url()
report_uri = Config.get([:http_security, :report_uri])
img_src = "img-src 'self' data: blob:"
media_src = "media-src 'self'"
{img_src, media_src} =
if Config.get([:media_proxy, :enabled]) &&
!Config.get([:media_proxy, :proxy_opts, :redirect_on_failure]) do
sources = get_proxy_and_attachment_sources()
{[img_src, sources], [media_src, sources]}
else
{img_src, media_src}
end
connect_src = ["connect-src 'self' ", static_url, ?\s, websocket_url]
connect_src =
@ -87,8 +99,8 @@ defp csp_string do
insecure = if scheme == "https", do: "upgrade-insecure-requests"
@csp_start
|> add_csp_param("img-src 'self' data: blob: https:")
|> add_csp_param("media-src 'self' https:")
|> add_csp_param(img_src)
|> add_csp_param(media_src)
|> add_csp_param(connect_src)
|> add_csp_param(script_src)
|> add_csp_param(insecure)
@ -96,6 +108,29 @@ defp csp_string do
|> :erlang.iolist_to_binary()
end
defp get_proxy_and_attachment_sources do
media_proxy_whitelist =
Enum.reduce(Config.get([:media_proxy, :whitelist]), [], fn host, acc ->
add_source(acc, host)
end)
upload_base_url =
if Config.get([Pleroma.Upload, :base_url]),
do: URI.parse(Config.get([Pleroma.Upload, :base_url])).host
s3_endpoint =
if Config.get([Pleroma.Upload, :uploader]) == Pleroma.Uploaders.S3,
do: URI.parse(Config.get([Pleroma.Uploaders.S3, :public_endpoint])).host
[]
|> add_source(upload_base_url)
|> add_source(s3_endpoint)
|> add_source(media_proxy_whitelist)
end
defp add_source(iodata, nil), do: iodata
defp add_source(iodata, source), do: [[?\s, source] | iodata]
defp add_csp_param(csp_iodata, nil), do: csp_iodata
defp add_csp_param(csp_iodata, param), do: [[param, ?;] | csp_iodata]