Wed, 21 Oct 2009 13:59:54 +0100
connlisteners: Localize tostring, fixes possible traceback when LuaSec not installed
-- Prosody IM -- Copyright (C) 2008-2009 Matthew Wild -- Copyright (C) 2008-2009 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local st = require "util.stanza"; local sm_bind_resource = require "core.sessionmanager".bind_resource; local sm_make_authenticated = require "core.sessionmanager".make_authenticated; local base64 = require "util.encodings".base64; local nodeprep = require "util.encodings".stringprep.nodeprep; local datamanager_load = require "util.datamanager".load; local usermanager_validate_credentials = require "core.usermanager".validate_credentials; local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods; local usermanager_user_exists = require "core.usermanager".user_exists; local usermanager_get_password = require "core.usermanager".get_password; local t_concat, t_insert = table.concat, table.insert; local tostring = tostring; local jid_split = require "util.jid".split local md5 = require "util.hashes".md5; local config = require "core.configmanager"; local secure_auth_only = config.get(module:get_host(), "core", "c2s_require_encryption") or config.get(module:get_host(), "core", "require_encryption"); local log = module._log; local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; local new_sasl = require "util.sasl".new; local function build_reply(status, ret, err_msg) local reply = st.stanza(status, {xmlns = xmlns_sasl}); if status == "challenge" then log("debug", "%s", ret or ""); reply:text(base64.encode(ret or "")); elseif status == "failure" then reply:tag(ret):up(); if err_msg then reply:tag("text"):text(err_msg); end elseif status == "success" then log("debug", "%s", ret or ""); reply:text(base64.encode(ret or "")); else module:log("error", "Unknown sasl status: %s", status); end return reply; end local function handle_status(session, status) if status == "failure" then session.sasl_handler = nil; elseif status == "success" then local username = nodeprep(session.sasl_handler.username); session.sasl_handler = nil; if not username then -- TODO move this to sessionmanager module:log("warn", "SASL succeeded but we didn't get a username!"); session.sasl_handler = nil; session:reset_stream(); return; end sm_make_authenticated(session, username); session:reset_stream(); end end local function credentials_callback(mechanism, ...) if mechanism == "PLAIN" then local username, hostname, password = ...; username = nodeprep(username); if not username then return false; end local response = usermanager_validate_credentials(hostname, username, password, mechanism); if response == nil then return false; else return response; end elseif mechanism == "DIGEST-MD5" then local function func(x) return x; end local node, domain, realm, decoder = ...; local prepped_node = nodeprep(node); if not prepped_node then return func, nil; end local password = usermanager_get_password(prepped_node, domain); if password then if decoder then node, realm, password = decoder(node), decoder(realm), decoder(password); end return func, md5(node..":"..realm..":"..password); else return func, nil; end end end local function sasl_handler(session, stanza) if stanza.name == "auth" then -- FIXME ignoring duplicates because ejabberd does if config.get(session.host or "*", "core", "anonymous_login") then if stanza.attr.mechanism ~= "ANONYMOUS" then return session.send(build_reply("failure", "invalid-mechanism")); end elseif stanza.attr.mechanism == "ANONYMOUS" then return session.send(build_reply("failure", "mechanism-too-weak")); end session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, credentials_callback); if not session.sasl_handler then return session.send(build_reply("failure", "invalid-mechanism")); end elseif not session.sasl_handler then return; -- FIXME ignoring out of order stanzas because ejabberd does end local text = stanza[1]; if text then text = base64.decode(text); log("debug", "%s", text); if not text then session.sasl_handler = nil; session.send(build_reply("failure", "incorrect-encoding")); return; end end local status, ret, err_msg = session.sasl_handler:feed(text); handle_status(session, status); local s = build_reply(status, ret, err_msg); log("debug", "sasl reply: %s", tostring(s)); session.send(s); end module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler); module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler); module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler); local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; module:add_event_hook("stream-features", function (session, features) if not session.username then if secure_auth_only and not session.secure then return; end features:tag("mechanisms", mechanisms_attr); -- TODO: Provide PLAIN only if TLS is active, this is a SHOULD from the introduction of RFC 4616. This behavior could be overridden via configuration but will issuing a warning or so. if config.get(session.host or "*", "core", "anonymous_login") then features:tag("mechanism"):text("ANONYMOUS"):up(); else local mechanisms = usermanager_get_supported_methods(session.host or "*"); for k, v in pairs(mechanisms) do features:tag("mechanism"):text(k):up(); end end features:up(); else features:tag("bind", bind_attr):tag("required"):up():up(); features:tag("session", xmpp_session_attr):tag("optional"):up():up(); end end); module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function (session, stanza) log("debug", "Client requesting a resource bind"); local resource; if stanza.attr.type == "set" then local bind = stanza.tags[1]; if bind and bind.attr.xmlns == xmlns_bind then resource = bind:child_with_name("resource"); if resource then resource = resource[1]; end end end local success, err_type, err, err_msg = sm_bind_resource(session, resource); if not success then session.send(st.error_reply(stanza, err_type, err, err_msg)); else session.send(st.reply(stanza) :tag("bind", { xmlns = xmlns_bind}) :tag("jid"):text(session.full_jid)); end end); module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", function (session, stanza) log("debug", "Client requesting a session"); session.send(st.reply(stanza)); end);