--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_auth_external/mod_auth_external.lua	Thu Jun 10 13:01:36 2010 +0100
@@ -0,0 +1,141 @@
+--
+-- NOTE: currently this uses lpc; when waqas fixes process, it can go back to that
+--
+-- Prosody IM
+-- Copyright (C) 2010 Waqas Hussain
+-- Copyright (C) 2010 Jeff Mitchell
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+--local process = require "process";
+local lpc = require "lpc";
+
+local config = require "core.configmanager";
+local log = module._log;
+local host = module.host;
+local script_type = config.get(host, "core", "external_auth_protocol") or "generic";
+assert(script_type == "ejabberd" or script_type == "generic");
+local command = config.get(host, "core", "external_auth_command") or "";
+assert(type(command) == "string");
+assert(not host:find(":"));
+local usermanager = require "core.usermanager";
+local jid_bare = require "util.jid".bare;
+local new_sasl = require "util.sasl".new;
+
+--local proc;
+local pid;
+local readfile;
+local writefile;
+local function send_query(text)
+	-- if not proc then
+	if not pid then
+		log("debug", "Opening process");
+		-- proc = process.popen(command);
+		pid, writefile, readfile = lpc.run(command);
+	end
+	-- if not proc then
+	if not pid then
+		log("debug", "Process failed to open");
+		return nil;
+	end
+	-- proc:write(text);
+	-- proc:flush();
+	writefile:write(text);
+	writefile:flush();
+	if script_type == "ejabberd" then
+		-- return proc:read(4); -- FIXME do properly
+		return readfile:read(4); -- FIXME do properly
+	elseif script_type == "generic" then
+		-- return proc:read(1);
+		return readfile:read();
+	end
+end
+
+function do_query(kind, username, password)
+	if not username then return nil, "not-acceptable"; end
+	username = nodeprep(username);
+	if not username then return nil, "jid-malformed"; end
+	
+	local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
+	local len = #query
+	if len > 1000 then return nil, "policy-violation"; end
+	
+	if script_type == "ejabberd" then
+		local lo = len % 256;
+		local hi = (len - lo) / 256;
+		query = string.char(hi, lo)..query;
+	end
+	if script_type == "generic" then
+		query = query..'\n';
+	end
+	
+	local response = send_query(query);
+	if (script_type == "ejabberd" and response == "\0\2\0\0") or
+		(script_type == "generic" and response == "0") then
+			return nil, "not-authorized";
+	elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
+		(script_type == "generic" and response == "1") then
+			return true;
+	else
+		log("debug", "Nonsense back");
+		--proc:close();
+		--proc = nil;
+		return nil, "internal-server-error";
+	end
+end
+
+function new_external_provider(host)
+	local provider = { name = "external" };
+
+	function provider.test_password(username, password)
+		return do_query("auth", username, password);
+	end
+
+	function provider.set_password(username, password)
+		return do_query("setpass", username, password);
+	end
+
+	function provider.user_exists(username)
+		return do_query("isuser", username);
+	end
+
+	function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
+	
+	function provider.get_sasl_handler()
+		local realm = module:get_option("sasl_realm") or module.host;
+		local testpass_authentication_profile = {
+			plain_test = function(username, password, realm)
+				local prepped_username = nodeprep(username);
+				if not prepped_username then
+					log("debug", "NODEprep failed on username: %s", username);
+					return "", nil;
+				end
+				return usermanager.test_password(prepped_username, password, realm), true;
+			end,
+		};
+		return new_sasl(realm, testpass_authentication_profile);
+	end
+
+	function provider.is_admin(jid)
+		local admins = config.get(host, "core", "admins");
+		if admins ~= config.get("*", "core", "admins") then
+			if type(admins) == "table" then
+				jid = jid_bare(jid);
+				for _,admin in ipairs(admins) do
+					if admin == jid then return true; end
+				end
+			elseif admins then
+				log("error", "Option 'admins' for host '%s' is not a table", host);
+			end
+		end
+		return usermanager.is_admin(jid); -- Test whether it's a global admin instead
+	end
+
+	return provider;
+end
+
+module:add_item("auth-provider", new_external_provider(module.host));