--- Prosody IM v0.3
--- Copyright (C) 2008-2009 Matthew Wild
--- Copyright (C) 2008-2009 Waqas Hussain
+-- 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 jid_split = require "util.jid".split;
local md5 = require "util.hashes".md5;
local config = require "core.configmanager";
-local log = require "util.logger".init("mod_saslauth");
+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";
+
+-- 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", ret or "");
+ --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", ret or "");
+ --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, 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);
+ 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
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", 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
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();
- if config.get(session.host or "*", "core", "sasl_anonymous") then
- features:tag("mechanism"):text("ANONYMOUS"):up();
- end
- 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);
projects / prosody.git / blobdiff