mod_auth_cyrus: Add empty 'profile' table to SASL handler objects This is for compatibility with Prosody's built-in util.sasl objects. A SASL profile table usually includes methods supported by the backend, which can be used by SASL mechanism handlers to perform operations (such as testing the password). It also optionally contains a 'cb' field with channel binding method handlers. The Cyrus backend doesn't support channel binding, and doesn't have the same concept of auth backend methods (it handles all that internally, and Prosody has no insight or control over it). Thus, we create an empty profile which informs Prosody that the SASL handler does not support any of the auth or channel binding methods. Some features will not work, but they didn't work anyway. This just makes it explicit. This fixes a traceback in mod_sasl2_fast, which expected SASL handlers to always contain a 'profile' field.

local adns = require "net.adns";
local rbl = module:get_option_string("registration_rbl");

local function reverse(ip, suffix)
	if ip:sub(1,7):lower() == "::ffff:" then
		ip = ip:sub(8);
	end
	local a,b,c,d = ip:match("^(%d+).(%d+).(%d+).(%d+)$");
	if not a then return end
	return ("%d.%d.%d.%d.%s"):format(d,c,b,a, suffix);
end

-- TODO async
-- module:hook("user-registering", function (event) end);

module:hook("user-registered", function (event)
	local session = event.session;
	local ip = session and session.ip;
	local rbl_ip = ip and reverse(ip, rbl);
	if rbl_ip then
		local log = session.log;
		adns.lookup(function (reply)
			if reply and reply[1] then
				log("warn", "Account %s@%s registered from IP %s found in RBL (%s)", event.username, event.host or module.host, ip, reply[1].a);
			end
		end, rbl_ip);
	end
end);