-- 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 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 = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); local sasl_backend = module:get_option("sasl_backend") or "builtin"; 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; if sasl_backend == "builtin" then new_sasl = require "util.sasl".new; elseif sasl_backend == "cyrus" then prosody.unlock_globals(); --FIXME: Figure out why this is needed and -- why cyrussasl isn't caught by the sandbox local ok, cyrus = pcall(require, "util.sasl_cyrus"); prosody.lock_globals(); if ok then local cyrus_new = cyrus.new; new_sasl = function(realm) return cyrus_new(module:get_option("cyrus_service_realm") or realm, module:get_option("cyrus_service_name") or "xmpp"); end else module:log("error", "Failed to load Cyrus SASL because: %s", cyrus); error("Failed to load Cyrus SASL"); end else module:log("error", "Unknown SASL backend: %s", sasl_backend); error("Unknown SASL backend"); end local default_authentication_profile = { plain = function(username, realm) local prepped_username = nodeprep(username); if not prepped_username then log("debug", "NODEprep failed on username: %s", username); return "", nil; end local password = usermanager_get_password(prepped_username, realm); if not password then return "", nil; end return password, true; end }; local anonymous_authentication_profile = { anonymous = function(username, realm) return true; -- for normal usage you should always return true here end }; 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) if status == "failure" then session.sasl_handler = session.sasl_handler:clean_clone(); elseif status == "success" then local username = nodeprep(session.sasl_handler.username); 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, session.sasl_handler.username); session.sasl_handler = nil; session:reset_stream(); 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 local valid_mechanism = session.sasl_handler:select(stanza.attr.mechanism); if not valid_mechanism then return session.send(build_reply("failure", "invalid-mechanism")); end if secure_auth_only and not session.secure then return session.send(build_reply("failure", "encryption-required")); 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", "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; end end local status, ret, err_msg = session.sasl_handler:process(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: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 local realm = module:get_option("sasl_realm") or origin.host; if module:get_option("anonymous_login") then origin.sasl_handler = new_sasl(realm, anonymous_authentication_profile); else origin.sasl_handler = new_sasl(realm, default_authentication_profile); if not (module:get_option("allow_unencrypted_plain_auth")) and not origin.secure then origin.sasl_handler:forbidden({"PLAIN"}); end end features:tag("mechanisms", mechanisms_attr); for k, v in pairs(origin.sasl_handler:mechanisms()) do features:tag("mechanism"):text(v):up(); 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);