2 -- Copyright (C) 2008-2009 Matthew Wild
3 -- Copyright (C) 2008-2009 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;
15 local nodeprep = require "util.encodings".stringprep.nodeprep;
16 local datamanager_load = require "util.datamanager".load;
17 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
18 local t_concat, t_insert = table.concat, table.insert;
19 local tostring = tostring;
20 local jid_split = require "util.jid".split
21 local md5 = require "util.hashes".md5;
22 local config = require "core.configmanager";
24 local secure_auth_only = config.get(module:get_host(), "core", "require_encryption");
26 local log = module._log;
28 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
29 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
30 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
32 local new_sasl = require "util.sasl".new;
34 local function build_reply(status, ret, err_msg)
35 local reply = st.stanza(status, {xmlns = xmlns_sasl});
36 if status == "challenge" then
37 log("debug", "%s", ret or "");
38 reply:text(base64.encode(ret or ""));
39 elseif status == "failure" then
41 if err_msg then reply:tag("text"):text(err_msg); end
42 elseif status == "success" then
43 log("debug", "%s", ret or "");
44 reply:text(base64.encode(ret or ""));
46 module:log("error", "Unknown sasl status: %s", status);
51 local function handle_status(session, status)
52 if status == "failure" then
53 session.sasl_handler = nil;
54 elseif status == "success" then
55 local username = nodeprep(session.sasl_handler.username);
56 session.sasl_handler = nil;
57 if not username then -- TODO move this to sessionmanager
58 module:log("warn", "SASL succeeded but we didn't get a username!");
59 session:reset_stream();
62 sm_make_authenticated(session, username);
63 session:reset_stream();
67 local function password_callback(node, hostname, realm, mechanism, decoder)
68 local func = function(x) return x; end;
69 local node = nodeprep(node);
73 local password = (datamanager_load(node, hostname, "accounts") or {}).password; -- FIXME handle hashed passwords
75 if mechanism == "PLAIN" then
76 return func, password;
77 elseif mechanism == "DIGEST-MD5" then
78 if decoder then node, realm, password = decoder(node), decoder(realm), decoder(password); end
79 return func, md5(node..":"..realm..":"..password);
85 local function sasl_handler(session, stanza)
86 if stanza.name == "auth" then
87 -- FIXME ignoring duplicates because ejabberd does
88 if config.get(session.host or "*", "core", "anonymous_login") then
89 if stanza.attr.mechanism ~= "ANONYMOUS" then
90 return session.send(build_reply("failure", "invalid-mechanism"));
92 elseif stanza.attr.mechanism == "ANONYMOUS" then
93 return session.send(build_reply("failure", "mechanism-too-weak"));
95 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
96 if not session.sasl_handler then
97 return session.send(build_reply("failure", "invalid-mechanism"));
99 elseif not session.sasl_handler then
100 return; -- FIXME ignoring out of order stanzas because ejabberd does
102 local text = stanza[1];
104 text = base64.decode(text);
105 log("debug", "%s", text);
107 session.sasl_handler = nil;
108 session.send(build_reply("failure", "incorrect-encoding"));
112 local status, ret, err_msg = session.sasl_handler:feed(text);
113 handle_status(session, status);
114 local s = build_reply(status, ret, err_msg);
115 log("debug", "sasl reply: %s", tostring(s));
119 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
120 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
121 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
123 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
124 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
125 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
126 module:add_event_hook("stream-features",
127 function (session, features)
128 if not session.username then
129 if secure_auth_only and not session.secure then
132 features:tag("mechanisms", mechanisms_attr);
133 -- 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.
134 if config.get(session.host or "*", "core", "anonymous_login") then
135 features:tag("mechanism"):text("ANONYMOUS"):up();
137 features:tag("mechanism"):text("DIGEST-MD5"):up();
138 features:tag("mechanism"):text("PLAIN"):up();
142 features:tag("bind", bind_attr):tag("required"):up():up();
143 features:tag("session", xmpp_session_attr):up();
147 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
148 function (session, stanza)
149 log("debug", "Client requesting a resource bind");
151 if stanza.attr.type == "set" then
152 local bind = stanza.tags[1];
153 if bind and bind.attr.xmlns == xmlns_bind then
154 resource = bind:child_with_name("resource");
156 resource = resource[1];
160 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
162 session.send(st.error_reply(stanza, err_type, err, err_msg));
164 session.send(st.reply(stanza)
165 :tag("bind", { xmlns = xmlns_bind})
166 :tag("jid"):text(session.full_jid));
170 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
171 function (session, stanza)
172 log("debug", "Client requesting a session");
173 session.send(st.reply(stanza));