2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
11 local st = require "util.stanza";
12 local sm_bind_resource = require "core.sessionmanager".bind_resource;
13 local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
14 local base64 = require "util.encodings".base64;
16 local nodeprep = require "util.encodings".stringprep.nodeprep;
17 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
18 local t_concat, t_insert = table.concat, table.insert;
19 local tostring = tostring;
21 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
22 local anonymous_login = module:get_option("anonymous_login");
23 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
25 local log = module._log;
27 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
28 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
29 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
31 local new_sasl = require "util.sasl".new;
33 local anonymous_authentication_profile = {
34 anonymous = function(username, realm)
35 return true; -- for normal usage you should always return true here
39 local function build_reply(status, ret, err_msg)
40 local reply = st.stanza(status, {xmlns = xmlns_sasl});
41 if status == "challenge" then
42 --log("debug", "CHALLENGE: %s", ret or "");
43 reply:text(base64.encode(ret or ""));
44 elseif status == "failure" then
46 if err_msg then reply:tag("text"):text(err_msg); end
47 elseif status == "success" then
48 --log("debug", "SUCCESS: %s", ret or "");
49 reply:text(base64.encode(ret or ""));
51 module:log("error", "Unknown sasl status: %s", status);
56 local function handle_status(session, status, ret, err_msg)
57 if status == "failure" then
58 session.sasl_handler = session.sasl_handler:clean_clone();
59 elseif status == "success" then
60 local username = nodeprep(session.sasl_handler.username);
62 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
64 session.sasl_handler = nil;
65 session:reset_stream();
67 module:log("warn", "SASL succeeded but username was invalid");
68 session.sasl_handler = session.sasl_handler:clean_clone();
69 return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
72 return status, ret, err_msg;
75 local function sasl_handler(session, stanza)
76 if stanza.name == "auth" then
77 -- FIXME ignoring duplicates because ejabberd does
78 local mechanism = stanza.attr.mechanism;
79 if anonymous_login then
80 if mechanism ~= "ANONYMOUS" then
81 return session.send(build_reply("failure", "invalid-mechanism"));
83 elseif mechanism == "ANONYMOUS" then
84 return session.send(build_reply("failure", "mechanism-too-weak"));
86 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
87 return session.send(build_reply("failure", "encryption-required"));
89 local valid_mechanism = session.sasl_handler:select(mechanism);
90 if not valid_mechanism then
91 return session.send(build_reply("failure", "invalid-mechanism"));
93 elseif not session.sasl_handler then
94 return; -- FIXME ignoring out of order stanzas because ejabberd does
96 local text = stanza[1];
98 text = base64.decode(text);
99 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
101 session.sasl_handler = nil;
102 session.send(build_reply("failure", "incorrect-encoding"));
106 local status, ret, err_msg = session.sasl_handler:process(text);
107 status, ret, err_msg = handle_status(session, status, ret, err_msg);
108 local s = build_reply(status, ret, err_msg);
109 log("debug", "sasl reply: %s", tostring(s));
113 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
114 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
115 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
117 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
118 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
119 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
120 module:hook("stream-features", function(event)
121 local origin, features = event.origin, event.features;
122 if not origin.username then
123 if secure_auth_only and not origin.secure then
126 if anonymous_login then
127 origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile);
129 origin.sasl_handler = usermanager_get_sasl_handler(module.host);
131 features:tag("mechanisms", mechanisms_attr);
132 for mechanism in pairs(origin.sasl_handler:mechanisms()) do
133 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
134 features:tag("mechanism"):text(mechanism):up();
139 features:tag("bind", bind_attr):tag("required"):up():up();
140 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
144 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event)
145 log("debug", "Client requesting a resource bind");
146 local origin, stanza = event.origin, event.stanza;
148 if stanza.attr.type == "set" then
149 local bind = stanza.tags[1];
150 resource = bind:child_with_name("resource");
151 resource = resource and #resource.tags == 0 and resource[1] or nil;
153 local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
155 origin.send(st.reply(stanza)
156 :tag("bind", { xmlns = xmlns_bind })
157 :tag("jid"):text(origin.full_jid));
159 origin.send(st.error_reply(stanza, err_type, err, err_msg));
164 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", function(event)
165 log("debug", "Client requesting a session");
166 event.origin.send(st.reply(event.stanza));