Merge with tip.

11 files changed, 712 insertions, 268 deletions

diff --git a/util/dataforms.lua b/util/dataforms.lua
index 5626172e..a3bde8ca 100644
--- a/util/dataforms.lua
+++ b/util/dataforms.lua
@@ -93,7 +93,13 @@ function form_t.data(layout, stanza)
 	local data = {};
 	
 	for field_tag in stanza:childtags() do
-		local field_type = field_tag.attr.type;
+		local field_type;
+		for n, field in ipairs(layout) do
+			if field.name == field_tag.attr.var then
+				field_type = field.type;
+				break;
+			end
+		end
 		
 		local reader = field_readers[field_type];
 		if reader then
diff --git a/util/datamanager.lua b/util/datamanager.lua
index 4d07d6cc..bfd69ebf 100644
--- a/util/datamanager.lua
+++ b/util/datamanager.lua
@@ -15,13 +15,13 @@ local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
 local log = require "util.logger".init("datamanager");
 local io_open = io.open;
 local os_remove = os.remove;
-local io_popen = io.popen;
 local tostring, tonumber = tostring, tonumber;
 local error = error;
 local next = next;
 local t_insert = table.insert;
 local append = require "util.serialization".append;
 local path_separator = "/"; if os.getenv("WINDIR") then path_separator = "\\" end
+local lfs_mkdir = require "lfs".mkdir;
 
 module "datamanager"
 
@@ -43,7 +43,7 @@ local _mkdir = {};
 local function mkdir(path)
 	path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
 	if not _mkdir[path] then
-		local x = io_popen("mkdir \""..path.."\" 2>&1"):read("*a");
+		lfs_mkdir(path);
 		_mkdir[path] = true;
 	end
 	return path;
diff --git a/util/dependencies.lua b/util/dependencies.lua
index 5b07072f..b1d02921 100644
--- a/util/dependencies.lua
+++ b/util/dependencies.lua
@@ -17,8 +17,12 @@ local function missingdep(name, sources, msg)
 	print("Prosody was unable to find "..tostring(name));
 	print("This package can be obtained in the following ways:");
 	print("");
-	for k,v in pairs(sources) do
-		print("", k, v);
+	local longest_platform = 0;
+	for platform in pairs(sources) do
+		longest_platform = math.max(longest_platform, #platform);
+	end
+	for platform, source in pairs(sources) do
+		print("", platform..":"..(" "):rep(4+longest_platform-#platform)..source);
 	end
 	print("");
 	print(msg or (name.." is required for Prosody to run, so we will now exit."));
@@ -30,24 +34,51 @@ end
 local lxp = softreq "lxp"
 
 if not lxp then
-	missingdep("luaexpat", { ["Ubuntu 8.04 (Hardy)"] = "sudo apt-get install liblua5.1-expat0"; ["luarocks"] = "luarocks install luaexpat"; });
+	missingdep("luaexpat", {
+			["Debian/Ubuntu"] = "sudo apt-get install liblua5.1-expat0";
+			["luarocks"] = "luarocks install luaexpat";
+			["Source"] = "http://www.keplerproject.org/luaexpat/";
+		});
 	fatal = true;
 end
 
 local socket = softreq "socket"
 
 if not socket then
-	missingdep("luasocket", { ["Ubuntu 8.04 (Hardy)"] = "sudo apt-get install liblua5.1-socket2"; ["luarocks"] = "luarocks install luasocket"; });
+	missingdep("luasocket", {
+			["Debian/Ubuntu"] = "sudo apt-get install liblua5.1-socket2";
+			["luarocks"] = "luarocks install luasocket";
+			["Source"] = "http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/";
+		});
 	fatal = true;
 end
 	
+local lfs, err = softreq "lfs"
+if not lfs then
+	missingdep("luafilesystem", {
+			["luarocks"] = "luarocks install luafilesystem";
+	 		["Debian/Ubuntu"] = "sudo apt-get install liblua5.1-luafilesystem0";
+	 		["Source"] = "http://www.keplerproject.org/luafilesystem/";
+	 	});
+	fatal = true;
+end
+
 local ssl = softreq "ssl"
 
 if not ssl then
 	if config.get("*", "core", "run_without_ssl") then
 		log("warn", "Running without SSL support because run_without_ssl is defined in the config");
 	else
-		missingdep("LuaSec", { ["Source"] = "http://www.inf.puc-rio.br/~brunoos/luasec/" }, "SSL/TLS support will not be available");
+		missingdep("LuaSec", {
+				["Debian/Ubuntu"] = "http://prosody.im/download/start#debian_and_ubuntu";
+				["luarocks"] = "luarocks install luasec";
+				["Source"] = "http://www.inf.puc-rio.br/~brunoos/luasec/";
+			}, "SSL/TLS support will not be available");
+	end
+else
+	local major, minor, veryminor, patched = ssl._VERSION:match("(%d+)%.(%d+)%.?(%d*)(M?)");
+	if not major or ((tonumber(major) == 0 and (tonumber(minor) or 0) <= 3 and (tonumber(veryminor) or 0) <= 2) and patched ~= "M") then
+		log("error", "This version of LuaSec contains a known bug that causes disconnects, see http://prosody.im/doc/depends");
 	end
 end
 
diff --git a/util/jid.lua b/util/jid.lua
index ccc8309c..b43247cc 100644
--- a/util/jid.lua
+++ b/util/jid.lua
@@ -65,4 +65,17 @@ function prep(jid)
 	return host;
 end
 
+function join(node, host, resource)
+	if node and host and resource then
+		return node.."@"..host.."/"..resource;
+	elseif node and host then
+		return node.."@"..host;
+	elseif host and resource then
+		return host.."/"..resource;
+	elseif host then
+		return host;
+	end
+	return nil; -- Invalid JID
+end
+
 return _M;
diff --git a/util/sasl.lua b/util/sasl.lua
index 402f05b4..9c8fff78 100644
--- a/util/sasl.lua
+++ b/util/sasl.lua
@@ -14,258 +14,140 @@
 
 local md5 = require "util.hashes".md5;
 local log = require "util.logger".init("sasl");
-local tostring = tostring;
 local st = require "util.stanza";
-local generate_uuid = require "util.uuid".generate;
-local t_insert, t_concat = table.insert, table.concat;
-local to_byte, to_char = string.byte, string.char;
+local set = require "util.set";
+local array = require "util.array";
 local to_unicode = require "util.encodings".idna.to_unicode;
+
+local tostring = tostring;
+local pairs, ipairs = pairs, ipairs;
+local t_insert, t_concat = table.insert, table.concat;
 local s_match = string.match;
-local gmatch = string.gmatch
-local string = string
-local math = require "math"
 local type = type
 local error = error
-local print = print
-
-module "sasl"
+local setmetatable = setmetatable;
+local assert = assert;
+local require = require;
 
--- Credentials handler:
---   Arguments: ("PLAIN", user, host, password)
---   Returns: true (success) | false (fail) | nil (user unknown)
-local function new_plain(realm, credentials_handler)
-	local object = { mechanism = "PLAIN", realm = realm, credentials_handler = credentials_handler}
-	function object.feed(self, message)
-		if message == "" or message == nil then return "failure", "malformed-request" end
-		local response = message
-		local authorization = s_match(response, "([^%z]+)")
-		local authentication = s_match(response, "%z([^%z]+)%z")
-		local password = s_match(response, "%z[^%z]+%z([^%z]+)")
+require "util.iterators"
+local keys = keys
 
-    if authentication == nil or password == nil then return "failure", "malformed-request" end
-    self.username = authentication
-    local auth_success = self.credentials_handler("PLAIN", self.username, self.realm, password)
-
-    if auth_success then
-      return "success"
-    elseif auth_success == nil then
-      return "failure", "account-disabled"
-    else
-      return "failure", "not-authorized"
-    end
-  end
-  return object
-end
-
--- credentials_handler:
---   Arguments: (mechanism, node, domain, realm, decoder)
---   Returns: Password encoding, (plaintext) password
--- implementing RFC 2831
-local function new_digest_md5(realm, credentials_handler)
-	--TODO complete support for authzid
+local array = require "util.array"
+module "sasl"
 
-	local function serialize(message)
-		local data = ""
+--[[
+Authentication Backend Prototypes:
 
-		if type(message) ~= "table" then error("serialize needs an argument of type table.") end
+state = false : disabled
+state = true : enabled
+state = nil : non-existant
 
-		-- testing all possible values
-		if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
-		if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
-		if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
-		if message["charset"] then data = data..[[charset=]]..message.charset.."," end
-		if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
-		if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
-		data = data:gsub(",$", "")
-		return data
+plain:
+	function(username, realm)
+		return password, state;
 	end
 
-	local function utf8tolatin1ifpossible(passwd)
-		local i = 1;
-		while i <= #passwd do
-			local passwd_i = to_byte(passwd:sub(i, i));
-			if passwd_i > 0x7F then
-				if passwd_i < 0xC0 or passwd_i > 0xC3 then
-					return passwd;
-				end
-				i = i + 1;
-				passwd_i = to_byte(passwd:sub(i, i));
-				if passwd_i < 0x80 or passwd_i > 0xBF then
-					return passwd;
-				end
-			end
-			i = i + 1;
-		end
+plain-test:
+	function(username, realm, password)
+		return true or false, state;
+	end
 
-		local p = {};
-		local j = 0;
-		i = 1;
-		while (i <= #passwd) do
-			local passwd_i = to_byte(passwd:sub(i, i));
-			if passwd_i > 0x7F then
-				i = i + 1;
-				local passwd_i_1 = to_byte(passwd:sub(i, i));
-				t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
-			else
-				t_insert(p, to_char(passwd_i));
-			end
-			i = i + 1;
-		end
-		return t_concat(p);
+digest-md5:
+	function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
+												-- implementations it's not
+		return digesthash, state;
 	end
-	local function latin1toutf8(str)
-		local p = {};
-		for ch in gmatch(str, ".") do
-			ch = to_byte(ch);
-			if (ch < 0x80) then
-				t_insert(p, to_char(ch));
-			elseif (ch < 0xC0) then
-				t_insert(p, to_char(0xC2, ch));
-			else
-				t_insert(p, to_char(0xC3, ch - 64));
-			end
-		end
-		return t_concat(p);
+
+digest-md5-test:
+	function(username, domain, realm, encoding, digesthash)
+		return true or false, state;
 	end
-	local function parse(data)
-		local message = {}
-		-- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
-		for k, v in gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
-			message[k] = v;
-		end
-		return message;
+]]
+
+local method = {};
+method.__index = method;
+local mechanisms = {};
+local backend_mechanism = {};
+
+-- register a new SASL mechanims
+local function registerMechanism(name, backends, f)
+	assert(type(name) == "string", "Parameter name MUST be a string.");
+	assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
+	assert(type(f) == "function", "Parameter f MUST be a function.");
+	mechanisms[name] = f
+	for _, backend_name in ipairs(backends) do
+		if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
+		t_insert(backend_mechanism[backend_name], name);
 	end
+end
 
-	local object = { mechanism = "DIGEST-MD5", realm = realm, credentials_handler = credentials_handler};
-
-	object.nonce = generate_uuid();
-	object.step = 0;
-	object.nonce_count = {};
-
-	function object.feed(self, message)
-		self.step = self.step + 1;
-		if (self.step == 1) then
-			local challenge = serialize({	nonce = object.nonce,
-											qop = "auth",
-											charset = "utf-8",
-											algorithm = "md5-sess",
-											realm = self.realm});
-			return "challenge", challenge;
-		elseif (self.step == 2) then
-			local response = parse(message);
-			-- check for replay attack
-			if response["nc"] then
-				if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
-			end
-
-			-- check for username, it's REQUIRED by RFC 2831
-			if not response["username"] then
-				return "failure", "malformed-request";
-			end
-			self["username"] = response["username"];
-
-			-- check for nonce, ...
-			if not response["nonce"] then
-				return "failure", "malformed-request";
-			else
-				-- check if it's the right nonce
-				if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
-			end
-
-			if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
-			if not response["qop"] then response["qop"] = "auth" end
-
-			if response["realm"] == nil or response["realm"] == "" then
-				response["realm"] = "";
-			elseif response["realm"] ~= self.realm then
-				return "failure", "not-authorized", "Incorrect realm value";
-			end
+-- create a new SASL object which can be used to authenticate clients
+function new(realm, profile, forbidden)
+	local sasl_i = {profile = profile};
+	sasl_i.realm = realm;
+	local s = setmetatable(sasl_i, method);
+	if forbidden == nil then forbidden = {} end
+	s:forbidden(forbidden)
+	return s;
+end
 
-			local decoder;
-			if response["charset"] == nil then
-				decoder = utf8tolatin1ifpossible;
-			elseif response["charset"] ~= "utf-8" then
-				return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8.";
-			end
+-- get a fresh clone with the same realm, profiles and forbidden mechanisms
+function method:clean_clone()
+	return new(self.realm, self.profile, self:forbidden())
+end
 
-			local domain = "";
-			local protocol = "";
-			if response["digest-uri"] then
-				protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
-				if protocol == nil or domain == nil then return "failure", "malformed-request" end
-			else
-				return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
-			end
+-- set the forbidden mechanisms
+function method:forbidden( restrict )
+	if restrict then
+		-- set forbidden
+		self.restrict = set.new(restrict);
+	else
+		-- get forbidden
+		return array.collect(self.restrict:items());
+	end
+end
 
-			--TODO maybe realm support
-			self.username = response["username"];
-			local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
-			if Y == nil then return "failure", "not-authorized"
-			elseif Y == false then return "failure", "account-disabled" end
-			local A1 = "";
-			if response.authzid then
-				if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
-					-- COMPAT
-					log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
-					A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
-				else
-					return "failure", "invalid-authzid";
+-- get a list of possible SASL mechanims to use
+function method:mechanisms()
+	local mechanisms = {}
+	for backend, f in pairs(self.profile) do
+		if backend_mechanism[backend] then
+			for _, mechanism in ipairs(backend_mechanism[backend]) do
+				if not self.restrict:contains(mechanism) then
+					mechanisms[mechanism] = true;
 				end
-			else
-				A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
-			end
-			local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
-
-			local HA1 = md5(A1, true);
-			local HA2 = md5(A2, true);
-
-			local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
-			local response_value = md5(KD, true);
-
-			if response_value == response["response"] then
-				-- calculate rspauth
-				A2 = ":"..protocol.."/"..domain;
-
-				HA1 = md5(A1, true);
-				HA2 = md5(A2, true);
-
-				KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
-				local rspauth = md5(KD, true);
-				self.authenticated = true;
-				return "challenge", serialize({rspauth = rspauth});
-			else
-				return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
 			end
-		elseif self.step == 3 then
-			if self.authenticated ~= nil then return "success"
-			else return "failure", "malformed-request" end
 		end
 	end
-	return object;
+	self["possible_mechanisms"] = mechanisms;
+	return array.collect(keys(mechanisms));
 end
 
--- Credentials handler: Can be nil. If specified, should take the mechanism as
--- the only argument, and return true for OK, or false for not-OK (TODO)
-local function new_anonymous(realm, credentials_handler)
-	local object = { mechanism = "ANONYMOUS", realm = realm, credentials_handler = credentials_handler}
-		function object.feed(self, message)
-			return "success"
-		end
-	object["username"] = generate_uuid()
-	return object
+-- select a mechanism to use
+function method:select(mechanism)
+	if self.mech_i then
+		return false;
+	end
+	
+	self.mech_i = mechanisms[mechanism]
+	if self.mech_i == nil then 
+		return false;
+	end
+	return true;
 end
 
+-- feed new messages to process into the library
+function method:process(message)
+	--if message == "" or message == nil then return "failure", "malformed-request" end
+	return self.mech_i(self, message);
+end
 
-function new(mechanism, realm, credentials_handler)
-	local object
-	if mechanism == "PLAIN" then object = new_plain(realm, credentials_handler)
-	elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, credentials_handler)
-	elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, credentials_handler)
-	else
-		log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
-		return nil
-	end
-	return object
+-- load the mechanisms
+load_mechs = {"plain", "digest-md5", "anonymous", "scram"}
+for _, mech in ipairs(load_mechs) do
+	local name = "util.sasl."..mech;
+	local m = require(name);
+	m.init(registerMechanism)
 end
 
 return _M;
diff --git a/util/sasl/anonymous.lua b/util/sasl/anonymous.lua
new file mode 100644
index 00000000..65650294
--- /dev/null
+++ b/util/sasl/anonymous.lua
@@ -0,0 +1,36 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2009 Tobias Markmann
+--
+--    All rights reserved.
+--
+--    Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+--        * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+--        * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+--        * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+--
+--    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+local s_match = string.match;
+
+local log = require "util.logger".init("sasl");
+local generate_uuid = require "util.uuid".generate;
+
+module "anonymous"
+
+--=========================
+--SASL ANONYMOUS according to RFC 4505
+local function anonymous(self, message)
+	local username;
+	repeat
+		username = generate_uuid();
+	until self.profile.anonymous(username, self.realm);
+	self["username"] = username;
+	return "success"
+end
+
+function init(registerMechanism)
+	registerMechanism("ANONYMOUS", {"anonymous"}, anonymous);
+end
+
+return _M;
\ No newline at end of file
diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua
new file mode 100644
index 00000000..c4507d11
--- /dev/null
+++ b/util/sasl/digest-md5.lua
@@ -0,0 +1,229 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2009 Tobias Markmann
+--
+--    All rights reserved.
+--
+--    Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+--        * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+--        * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+--        * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+--
+--    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+local tostring = tostring;
+local type = type;
+
+local s_gmatch = string.gmatch;
+local s_match = string.match;
+local t_concat = table.concat;
+local t_insert = table.insert;
+local to_byte, to_char = string.byte, string.char;
+
+local md5 = require "util.hashes".md5;
+local log = require "util.logger".init("sasl");
+local generate_uuid = require "util.uuid".generate;
+
+module "digest-md5"
+
+--=========================
+--SASL DIGEST-MD5 according to RFC 2831
+
+local function digest(self, message)
+	--TODO complete support for authzid
+
+	local function serialize(message)
+		local data = ""
+
+		if type(message) ~= "table" then error("serialize needs an argument of type table.") end
+
+		-- testing all possible values
+		if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
+		if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
+		if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
+		if message["charset"] then data = data..[[charset=]]..message.charset.."," end
+		if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
+		if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
+		data = data:gsub(",$", "")
+		return data
+	end
+
+	local function utf8tolatin1ifpossible(passwd)
+		local i = 1;
+		while i <= #passwd do
+			local passwd_i = to_byte(passwd:sub(i, i));
+			if passwd_i > 0x7F then
+				if passwd_i < 0xC0 or passwd_i > 0xC3 then
+					return passwd;
+				end
+				i = i + 1;
+				passwd_i = to_byte(passwd:sub(i, i));
+				if passwd_i < 0x80 or passwd_i > 0xBF then
+					return passwd;
+				end
+			end
+			i = i + 1;
+		end
+
+		local p = {};
+		local j = 0;
+		i = 1;
+		while (i <= #passwd) do
+			local passwd_i = to_byte(passwd:sub(i, i));
+			if passwd_i > 0x7F then
+				i = i + 1;
+				local passwd_i_1 = to_byte(passwd:sub(i, i));
+				t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
+			else
+				t_insert(p, to_char(passwd_i));
+			end
+			i = i + 1;
+		end
+		return t_concat(p);
+	end
+	local function latin1toutf8(str)
+		local p = {};
+		for ch in s_gmatch(str, ".") do
+			ch = to_byte(ch);
+			if (ch < 0x80) then
+				t_insert(p, to_char(ch));
+			elseif (ch < 0xC0) then
+				t_insert(p, to_char(0xC2, ch));
+			else
+				t_insert(p, to_char(0xC3, ch - 64));
+			end
+		end
+		return t_concat(p);
+	end
+	local function parse(data)
+		local message = {}
+		-- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
+		for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
+			message[k] = v;
+		end
+		return message;
+	end
+
+	if not self.nonce then
+		self.nonce = generate_uuid();
+		self.step = 0;
+		self.nonce_count = {};
+	end
+
+	self.step = self.step + 1;
+	if (self.step == 1) then
+		local challenge = serialize({	nonce = self.nonce,
+										qop = "auth",
+										charset = "utf-8",
+										algorithm = "md5-sess",
+										realm = self.realm});
+		return "challenge", challenge;
+	elseif (self.step == 2) then
+		local response = parse(message);
+		-- check for replay attack
+		if response["nc"] then
+			if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
+		end
+
+		-- check for username, it's REQUIRED by RFC 2831
+		if not response["username"] then
+			return "failure", "malformed-request";
+		end
+		self["username"] = response["username"];
+
+		-- check for nonce, ...
+		if not response["nonce"] then
+			return "failure", "malformed-request";
+		else
+			-- check if it's the right nonce
+			if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
+		end
+
+		if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
+		if not response["qop"] then response["qop"] = "auth" end
+
+		if response["realm"] == nil or response["realm"] == "" then
+			response["realm"] = "";
+		elseif response["realm"] ~= self.realm then
+			return "failure", "not-authorized", "Incorrect realm value";
+		end
+
+		local decoder;
+		if response["charset"] == nil then
+			decoder = utf8tolatin1ifpossible;
+		elseif response["charset"] ~= "utf-8" then
+			return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8.";
+		end
+
+		local domain = "";
+		local protocol = "";
+		if response["digest-uri"] then
+			protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
+			if protocol == nil or domain == nil then return "failure", "malformed-request" end
+		else
+			return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
+		end
+
+		--TODO maybe realm support
+		self.username = response["username"];
+		local Y, state;
+		if self.profile.plain then
+			local password, state = self.profile.plain(response["username"], self.realm)
+			if state == nil then return "failure", "not-authorized"
+			elseif state == false then return "failure", "account-disabled" end
+			Y = md5(response["username"]..":"..response["realm"]..":"..password);
+		elseif self.profile["digest-md5"] then
+			Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
+			if state == nil then return "failure", "not-authorized"
+			elseif state == false then return "failure", "account-disabled" end
+		elseif self.profile["digest-md5-test"] then
+			-- TODO
+		end
+		--local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
+		--if Y == nil then return "failure", "not-authorized"
+		--elseif Y == false then return "failure", "account-disabled" end
+		local A1 = "";
+		if response.authzid then
+			if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
+				-- COMPAT
+				log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
+				A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
+			else
+				return "failure", "invalid-authzid";
+			end
+		else
+			A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
+		end
+		local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
+
+		local HA1 = md5(A1, true);
+		local HA2 = md5(A2, true);
+
+		local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
+		local response_value = md5(KD, true);
+
+		if response_value == response["response"] then
+			-- calculate rspauth
+			A2 = ":"..protocol.."/"..domain;
+
+			HA1 = md5(A1, true);
+			HA2 = md5(A2, true);
+
+			KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
+			local rspauth = md5(KD, true);
+			self.authenticated = true;
+			return "success", serialize({rspauth = rspauth});
+		else
+			return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
+		end
+	elseif self.step == 3 then
+		if self.authenticated ~= nil then return "success"
+		else return "failure", "malformed-request" end
+	end
+end
+
+function init(registerMechanism)
+	registerMechanism("DIGEST-MD5", {"plain"}, digest);
+end
+
+return _M;
\ No newline at end of file
diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua
new file mode 100644
index 00000000..a4c8765d
--- /dev/null
+++ b/util/sasl/plain.lua
@@ -0,0 +1,67 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2009 Tobias Markmann
+--
+--    All rights reserved.
+--
+--    Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+--        * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+--        * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+--        * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+--
+--    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+local s_match = string.match;
+local saslprep = require "util.encodings".stringprep.saslprep;
+local log = require "util.logger".init("sasl");
+
+module "plain"
+
+-- ================================
+-- SASL PLAIN according to RFC 4616
+local function plain(self, message)
+	if not message then
+		return "failure", "malformed-request";
+	end
+
+	local authorization, authentication, password = s_match(message, "^([^%z]+)%z([^%z]+)%z([^%z]+)");
+
+	if not authorization then
+		return "failure", "malformed-request";
+	end
+
+	-- SASLprep password and authentication
+	authentication = saslprep(authentication);
+	password = saslprep(password);
+
+	if (not password) or (password == "") or (not authentication) or (authentication == "") then
+		log("debug", "Username or password violates SASLprep.");
+		return "failure", "malformed-request", "Invalid username or password.";
+	end
+
+	local correct, state = false, false;
+	if self.profile.plain then
+		local correct_password;
+		correct_password, state = self.profile.plain(authentication, self.realm);
+		if correct_password == password then correct = true; else correct = false; end
+	elseif self.profile.plain_test then
+		correct, state = self.profile.plain_test(authentication, self.realm, password);
+	end
+
+	self.username = authentication
+	if not state then
+		return "failure", "account-disabled";
+	end
+
+	if correct then
+		return "success";
+	else
+		return "failure", "not-authorized", "Unable to authorize you with the authentication credentials you've sent.";
+	end
+end
+
+function init(registerMechanism)
+	registerMechanism("PLAIN", {"plain", "plain_test"}, plain);
+end
+
+return _M;
diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua
new file mode 100644
index 00000000..1e9c6f7d
--- /dev/null
+++ b/util/sasl/scram.lua
@@ -0,0 +1,154 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2009 Tobias Markmann
+--
+--    All rights reserved.
+--
+--    Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+--        * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+--        * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+--        * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+--
+--    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+local s_match = string.match;
+local type = type
+local string = string
+local base64 = require "util.encodings".base64;
+local xor = require "bit".bxor
+local hmac_sha1 = require "util.hmac".sha1;
+local sha1 = require "util.hashes".sha1;
+local generate_uuid = require "util.uuid".generate;
+local saslprep = require "util.encodings".stringprep.saslprep;
+local log = require "util.logger".init("sasl");
+
+module "scram"
+
+--=========================
+--SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
+local default_i = 4096
+
+local function bp( b )
+	local result = ""
+	for i=1, b:len() do
+		result = result.."\\"..b:byte(i)
+	end
+	return result
+end
+
+local function binaryXOR( a, b )
+	if a:len() > b:len() then
+		b = string.rep("\0", a:len() - b:len())..b
+	elseif string.len(a) < string.len(b) then
+		a = string.rep("\0", b:len() - a:len())..a
+	end
+	local result = ""
+	for i=1, a:len() do
+		result = result..string.char(xor(a:byte(i), b:byte(i)))
+	end
+	return result
+end
+
+-- hash algorithm independent Hi(PBKDF2) implementation
+local function Hi(hmac, str, salt, i)
+	local Ust = hmac(str, salt.."\0\0\0\1");
+	local res = Ust;	
+	for n=1,i-1 do
+		local Und = hmac(str, Ust)
+		res = binaryXOR(res, Und)
+		Ust = Und
+	end
+	return res
+end
+
+local function validate_username(username)
+	-- check for forbidden char sequences
+	for eq in username:gmatch("=(.?.?)") do
+		if eq ~= "2D" and eq ~= "3D" then
+			return false 
+		end 
+	end
+	
+	-- replace =2D with , and =3D with =
+	username:gsub("=2D", ",");
+	username:gsub("=3D", "=");
+	
+	-- apply SASLprep
+	username = saslprep(username);
+	return username;
+end
+
+local function scram_sha_1(self, message)
+	if not self.state then self["state"] = {} end
+	
+	if not self.state.name then
+		-- we are processing client_first_message
+		local client_first_message = message;
+		self.state["client_first_message"] = client_first_message;
+		self.state["name"] = client_first_message:match("n=(.+),r=")
+		self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
+		
+		if not self.state.name or not self.state.clientnonce then
+			return "failure", "malformed-request";
+		end
+		
+		self.state.name = validate_username(self.state.name);
+		if not self.state.name then
+			log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
+			return "failure", "malformed-request", "Invalid username.";
+		end
+		
+		self.state["servernonce"] = generate_uuid();
+		self.state["salt"] = generate_uuid();
+		
+		local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
+		self.state["server_first_message"] = server_first_message;
+		return "challenge", server_first_message
+	else
+		if type(message) ~= "string" then return "failure", "malformed-request" end
+		-- we are processing client_final_message
+		local client_final_message = message;
+		
+		self.state["proof"] = client_final_message:match("p=(.+)");
+		self.state["nonce"] = client_final_message:match("r=(.+),p=");
+		self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
+		if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
+			return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
+		end
+		
+		local password;
+		if self.profile.plain then
+			local password, state = self.profile.plain(self.state.name, self.realm)
+			if state == nil then return "failure", "not-authorized"
+			elseif state == false then return "failure", "account-disabled" end
+			password = saslprep(password);
+			if not password then
+				log("debug", "Password violates SASLprep.");
+				return "failure", "not-authorized", "Invalid password."
+			end
+		end
+		
+		local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
+		local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
+		local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
+		local StoredKey = sha1(ClientKey)
+		local AuthMessage = "n=" .. s_match(self.state.client_first_message,"n=(.+)") .. "," .. self.state.server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
+		local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
+		local ClientProof     = binaryXOR(ClientKey, ClientSignature)
+		local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
+		
+		if base64.encode(ClientProof) == self.state.proof then
+			local server_final_message = "v="..base64.encode(ServerSignature);
+			self["username"] = self.state.name;
+			return "success", server_final_message;
+		else
+			return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
+		end
+	end
+end
+
+function init(registerMechanism)
+	registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1);
+end
+
+return _M;
\ No newline at end of file
diff --git a/util/serialization.lua b/util/serialization.lua
index c2bbbb8d..7071d3f7 100644
--- a/util/serialization.lua
+++ b/util/serialization.lua
@@ -13,6 +13,7 @@ local t_insert = table.insert;
 local t_concat = table.concat;
 local error = error;
 local pairs = pairs;
+local next = next;
 
 local debug_traceback = debug.traceback;
 local log = require "util.logger".init("serialization");
@@ -34,21 +35,25 @@ local function _simplesave(o, ind, t, func)
 	elseif type(o) == "string" then
 		func(t, (("%q"):format(o):gsub("\\\n", "\\n")));
 	elseif type(o) == "table" then
-		func(t, "{\n");
-		for k,v in pairs(o) do
-			func(t, indent(ind));
-			func(t, "[");
-			func(t, basicSerialize(k));
-			func(t, "] = ");
-			if ind == 0 then
-				_simplesave(v, 0, t, func);
-			else
-				_simplesave(v, ind+1, t, func);
+		if next(o) ~= nil then
+			func(t, "{\n");
+			for k,v in pairs(o) do
+				func(t, indent(ind));
+				func(t, "[");
+				func(t, basicSerialize(k));
+				func(t, "] = ");
+				if ind == 0 then
+					_simplesave(v, 0, t, func);
+				else
+					_simplesave(v, ind+1, t, func);
+				end
+				func(t, ";\n");
 			end
-			func(t, ",\n");
+			func(t, indent(ind-1));
+			func(t, "}");
+		else
+			func(t, "{}");
 		end
-		func(t, indent(ind-1));
-		func(t, "}");
 	elseif type(o) == "boolean" then
 		func(t, (o and "true" or "false"));
 	else
diff --git a/util/timer.lua b/util/timer.lua
index c0c7f25a..efc1812d 100644
--- a/util/timer.lua
+++ b/util/timer.lua
@@ -8,6 +8,9 @@
 
 
 local ns_addtimer = require "net.server".addtimer;
+local event = require "net.server".event;
+local event_base = require "net.server".event_base;
+
 local get_time = os.time;
 local t_insert = table.insert;
 local t_remove = table.remove;
@@ -19,33 +22,51 @@ local new_data = {};
 
 module "timer"
 
-local function _add_task(delay, func)
-	local current_time = get_time();
-	delay = delay + current_time;
-	if delay >= current_time then
-		t_insert(new_data, {delay, func});
-	else func(); end
-end
-
-add_task = _add_task;
-
-ns_addtimer(function()
-	local current_time = get_time();
-	if #new_data > 0 then
-		for _, d in pairs(new_data) do
-			t_insert(data, d);
+local _add_task;
+if not event then
+	function _add_task(delay, func)
+		local current_time = get_time();
+		delay = delay + current_time;
+		if delay >= current_time then
+			t_insert(new_data, {delay, func});
+		else
+			func();
 		end
-		new_data = {};
 	end
-	
-	for i, d in pairs(data) do
-		local t, func = d[1], d[2];
-		if t <= current_time then
-			data[i] = nil;
-			local r = func(current_time);
-			if type(r) == "number" then _add_task(r, func); end
+
+	ns_addtimer(function()
+		local current_time = get_time();
+		if #new_data > 0 then
+			for _, d in pairs(new_data) do
+				t_insert(data, d);
+			end
+			new_data = {};
 		end
+		
+		for i, d in pairs(data) do
+			local t, func = d[1], d[2];
+			if t <= current_time then
+				data[i] = nil;
+				local r = func(current_time);
+				if type(r) == "number" then _add_task(r, func); end
+			end
+		end
+	end);
+else
+	local EVENT_LEAVE = (event.core and event.core.LEAVE) or -1;
+	function _add_task(delay, func)
+		event_base:addevent(nil, event.EV_TIMEOUT, function ()
+			local ret = func();
+			if ret then
+				_add_task(ret, func);
+			else
+				return EVENT_LEAVE;
+			end
+		end
+		, delay);
 	end
-end);
+end
+
+add_task = _add_task;
 
 return _M;