-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 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 usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler; local tostring = tostring; local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth") 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 function build_reply(status, ret, err_msg) local reply = st.stanza(status, {xmlns = xmlns_sasl}); if status == "challenge" then --log("debug", "CHALLENGE: %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", "SUCCESS: %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, ret, err_msg) if status == "failure" then session.sasl_handler = session.sasl_handler:clean_clone(); elseif status == "success" then local username = nodeprep(session.sasl_handler.username); local ok, err = sm_make_authenticated(session, session.sasl_handler.username); if ok then session.sasl_handler = nil; session:reset_stream(); else module:log("warn", "SASL succeeded but username was invalid"); session.sasl_handler = session.sasl_handler:clean_clone(); return "failure", "not-authorized", "User authenticated successfully, but username was invalid"; end end return status, ret, err_msg; end local function sasl_process_cdata(session, stanza) local text = stanza[1]; if text then text = base64.decode(text); --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " ")); if not text then session.sasl_handler = nil; session.send(build_reply("failure", "incorrect-encoding")); return true; end end local status, ret, err_msg = session.sasl_handler:process(text); status, ret, err_msg = handle_status(session, status, ret, err_msg); local s = build_reply(status, ret, err_msg); log("debug", "sasl reply: %s", tostring(s)); session.send(s); return true; end module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) local session, stanza = event.origin, event.stanza; if session.type ~= "c2s_unauthed" then return; end if session.sasl_handler and session.sasl_handler.selected then session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one end if not session.sasl_handler then session.sasl_handler = usermanager_get_sasl_handler(module.host); end local mechanism = stanza.attr.mechanism; if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then session.send(build_reply("failure", "encryption-required")); return true; end local valid_mechanism = session.sasl_handler:select(mechanism); if not valid_mechanism then session.send(build_reply("failure", "invalid-mechanism")); return true; end return sasl_process_cdata(session, stanza); end); module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) local session = event.origin; if not(session.sasl_handler and session.sasl_handler.selected) then session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); return true; end return sasl_process_cdata(session, event.stanza); end); module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) local session = event.origin; session.sasl_handler = nil; session.send(build_reply("failure", "aborted")); return true; end); 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:hook("stream-features", function(event) local origin, features = event.origin, event.features; if not origin.username then if secure_auth_only and not origin.secure then return; end origin.sasl_handler = usermanager_get_sasl_handler(module.host); features:tag("mechanisms", mechanisms_attr); for mechanism in pairs(origin.sasl_handler:mechanisms()) do if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then features:tag("mechanism"):text(mechanism):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:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) local origin, stanza = event.origin, event.stanza; local resource; if stanza.attr.type == "set" then local bind = stanza.tags[1]; resource = bind:child_with_name("resource"); resource = resource and #resource.tags == 0 and resource[1] or nil; end local success, err_type, err, err_msg = sm_bind_resource(origin, resource); if success then origin.send(st.reply(stanza) :tag("bind", { xmlns = xmlns_bind }) :tag("jid"):text(origin.full_jid)); origin.log("debug", "Resource bound: %s", origin.full_jid); else origin.send(st.error_reply(stanza, err_type, err, err_msg)); origin.log("debug", "Resource bind failed: %s", err_msg or err); end return true; end); local function handle_legacy_session(event) event.origin.send(st.reply(event.stanza)); return true; end module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session);