X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=plugins%2Fmod_saslauth.lua;h=d407e5da8588ff5bc8787e05fb5232c34326b03e;hb=1881612f6e77c771984d73b85704e89818a82977;hp=52ef68c7eb26f95620e83e3d39b847bcc8dde5ec;hpb=35532120c10c00816c525c813febc0ae749464d7;p=prosody.git diff --git a/plugins/mod_saslauth.lua b/plugins/mod_saslauth.lua index 52ef68c7..d407e5da 100644 --- a/plugins/mod_saslauth.lua +++ b/plugins/mod_saslauth.lua @@ -1,102 +1,168 @@ --- Prosody IM v0.1 --- Copyright (C) 2008 Matthew Wild --- Copyright (C) 2008 Waqas Hussain +-- Prosody IM +-- Copyright (C) 2008-2010 Matthew Wild +-- Copyright (C) 2008-2010 Waqas Hussain -- --- This program is free software; you can redistribute it and/or --- modify it under the terms of the GNU General Public License --- as published by the Free Software Foundation; either version 2 --- of the License, or (at your option) any later version. --- --- This program is distributed in the hope that it will be useful, --- but WITHOUT ANY WARRANTY; without even the implied warranty of --- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the --- GNU General Public License for more details. --- --- You should have received a copy of the GNU General Public License --- along with this program; if not, write to the Free Software --- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +-- 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 jid +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 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 = require "util.logger".init("mod_saslauth"); +-- Cyrus config options +local require_provisioning = module:get_option("cyrus_require_provisioning") or false; +local cyrus_service_realm = module:get_option("cyrus_service_realm"); +local cyrus_service_name = module:get_option("cyrus_service_name"); +local cyrus_application_name = module:get_option("cyrus_application_name"); + +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 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( + cyrus_service_realm or realm, + cyrus_service_name or "xmpp", + cyrus_application_name or "prosody" + ); + 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 - error("Unknown sasl status: "..status); + module:log("error", "Unknown sasl status: %s", status); end return reply; end -local function handle_status(session, status) +local function handle_status(session, status, ret, err_msg) if status == "failure" then - session.sasl_handler = nil; + session.sasl_handler = session.sasl_handler:clean_clone(); 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 username = nodeprep(session.sasl_handler.username); -local function password_callback(node, host, mechanism, raw_host) - 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 - return func, md5(node..":"..raw_host..":"..password); + if not(require_provisioning) or usermanager_user_exists(username, session.host) then + local aret, err = sm_make_authenticated(session, session.sasl_handler.username); + if aret 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 + else + module:log("warn", "SASL succeeded but we don't have an account provisioned for %s", username); + session.sasl_handler = session.sasl_handler:clean_clone(); + return "failure", "not-authorized", "User authenticated successfully, but not provisioned for XMPP"; end end - return func, nil; + return status, ret, err_msg; end -function sasl_handler(session, stanza) +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); + 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:feed(text); - handle_status(session, status); - local s = build_reply(status, ret, err_msg); - log("debug", "sasl reply: "..tostring(s)); + 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); end @@ -107,45 +173,55 @@ 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: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 +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 - 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 + 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); - -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); + 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);