Tue, 03 Mar 2009 17:25:20 +0000
pposix: Standardize error messages
-- Prosody IM v0.3 -- 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 base64 = require "util.encodings".base64; local usermanager_validate_credentials = require "core.usermanager".validate_credentials; 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 log = require "util.logger".init("mod_saslauth"); 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", 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", ret or ""); reply:text(base64.encode(ret or "")); else error("Unknown sasl status: "..status); end return reply; end local function handle_status(session, status) if status == "failure" then session.sasl_handler = nil; elseif status == "success" then if not session.sasl_handler.username then error("SASL succeeded but we didn't get a username!"); end -- TODO move this to sessionmanager sessionmanager.make_authenticated(session, session.sasl_handler.username); session.sasl_handler = nil; session:reset_stream(); end end local function password_callback(node, host, mechanism, decoder) local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords local func = function(x) return x; end; if password then if mechanism == "PLAIN" then return func, password; elseif mechanism == "DIGEST-MD5" then if decoder then node, host, password = decoder(node), decoder(host), decoder(password); end return func, md5(node..":"..host..":"..password); end end return func, nil; end local function sasl_handler(session, stanza) if stanza.name == "auth" then -- FIXME ignoring duplicates because ejabberd does session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback); 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", 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: "..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 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. features:tag("mechanism"):text("PLAIN"):up(); features:tag("mechanism"):text("DIGEST-MD5"):up(); features:tag("mechanism"):text("ANONYMOUS"):up(); features:up(); else features:tag("bind", bind_attr):tag("required"):up():up(); features:tag("session", xmpp_session_attr):up(); end end); module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function (session, stanza) log("debug", "Client tried to bind to a resource"); 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 tried to bind to a resource"); session.send(st.reply(stanza)); end);