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Validate Host header matches expected value before allowing access to Uploads

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This commit is contained in:
Mark Felder 2023-05-29 14:16:03 -04:00
commit a60dd0d92d
2 changed files with 24 additions and 1 deletions
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11
lib/pleroma/web/plugs/uploaded_media.ex
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@ -46,12 +46,21 @@ defmodule Pleroma.Web.Plugs.UploadedMedia do
config = Pleroma.Config.get(Pleroma.Upload)
with uploader <- Keyword.fetch!(config, :uploader),
media_host = Pleroma.Upload.base_url() |> URI.parse() |> Map.get(:host)
with {:valid_host, true} <- {:valid_host, match?(^media_host, conn.host)},
uploader <- Keyword.fetch!(config, :uploader),
proxy_remote = Keyword.get(config, :proxy_remote, false),
{:ok, get_method} <- uploader.get_file(file),
false <- media_is_banned(conn, get_method) do
get_media(conn, get_method, proxy_remote, opts)
else
{:valid_host, false} ->
conn
send_resp(conn, 400, Plug.Conn.Status.reason_phrase(400))
|> halt()
_ ->
conn
|> send_resp(:internal_server_error, dgettext("errors", "Failed"))