mod_http_oauth2: Implement stateless dynamic client registration Replaces previous explicit registration that required either the additional module mod_adhoc_oauth2_client or manually editing the database. That method was enough to have something to test with, but would not probably not scale easily. Dynamic client registration allows creating clients on the fly, which may be even easier in theory. In order to not allow basically unauthenticated writes to the database, we implement a stateless model here. per_host_key := HMAC(config -> oauth2_registration_key, hostname) client_id := JWT { client metadata } signed with per_host_key client_secret := HMAC(per_host_key, client_id) This should ensure everything we need to know is part of the client_id, allowing redirects etc to be validated, and the client_secret can be validated with only the client_id and the per_host_key. A nonce injected into the client_id JWT should ensure nobody can submit the same client metadata and retrieve the same client_secret

-- Monkeypatch to support socket activation
--
-- Requires LuaSocket after "agnostic" changes merged
--
-- To enable:
-- RunScript "socket-activation.lua"

local socket = require"socket";
local tcp_serv_mt = debug.getregistry()["tcp{server}"];
local socket_bind = socket.bind;

local SD_LISTEN_FDS_START = 3;

local fds = tonumber(os.getenv"LISTEN_FDS") or 0;

if fds < SD_LISTEN_FDS_START then return; end

local servs = {};

for i = 1, fds do
	local serv = socket.tcp();
	if serv:getfd() >= 0 then
		return; -- This won't work, we will leak the old FD
	end
	debug.setmetatable(serv, tcp_serv_mt);
	serv:setfd(SD_LISTEN_FDS_START + i - 1);
	local ip, port = serv:getsockname();
	servs [ ip .. ":" .. port ] = serv;
end

function socket.bind( ip, port, backlog )
	local sock = servs [ ip .. ":" .. port ];
	if sock then
		servs [ ip .. ":" .. port ] = nil;
		return sock;
	end
	if next(servs) == nil then
		-- my work here is done
		socket.bind = socket_bind;
	end
	return socket_bind( ip, port, backlog );
end