SASL!

(but before you get too excited, no resource binding yet. And yes, there are still plenty of rough edges to the code...)
((eg. must move <stream:features> out of xmlhandlers.lua o_O ))

plugins/mod_saslauth.lua

@@ -0,0 +1,53 @@
+
+local st = require "util.stanza";
+local send = require "core.sessionmanager".send_to_session;
+
+local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
+local t_concat = table.concat;
+local tostring = tostring;
+
+local log = require "util.logger".init("mod_saslauth");
+
+local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
+
+local new_connhandler = require "net.connhandlers".new;
+local new_sasl = require "util.sasl".new;
+
+add_handler("c2s_unauthed", "auth",
+		function (session, stanza)
+			if not session.sasl_handler then
+				session.sasl_handler = new_sasl(stanza.attr.mechanism, 
+					function (username, password)
+						-- onAuth
+						require "core.usermanager"
+						if usermanager_validate_credentials(session.host, username, password) then
+							return true;
+						end
+						return false;
+					end,
+					function (username)
+						-- onSuccess
+						local success, err = sessionmanager.make_authenticated(session, username);
+						if not success then
+							sessionmanager.destroy_session(session);
+						end
+						session.sasl_handler = nil;
+						session.connhandler = new_connhandler("xmpp-client", session);
+						session.notopen = true;
+					end,
+					function (reason)
+						-- onFail
+						log("debug", "SASL failure, reason: %s", reason);
+					end,
+					function (stanza)
+						-- onWrite
+						log("debug", "SASL writes: %s", tostring(stanza));
+						send(session, stanza);
+					end
+				);
+				session.sasl_handler:feed(stanza);	
+			else
+				error("Client tried to negotiate SASL again", 0);
+			end
+			
+		end);