2 -- Copyright (C) 2008 Matthew Wild
3 -- Copyright (C) 2008 Waqas Hussain
5 -- This program is free software; you can redistribute it and/or
6 -- modify it under the terms of the GNU General Public License
7 -- as published by the Free Software Foundation; either version 2
8 -- of the License, or (at your option) any later version.
10 -- This program is distributed in the hope that it will be useful,
11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 -- GNU General Public License for more details.
15 -- You should have received a copy of the GNU General Public License
16 -- along with this program; if not, write to the Free Software
17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 local st = require "util.stanza";
23 local sm_bind_resource = require "core.sessionmanager".bind_resource;
25 local base64 = require "util.encodings".base64;
27 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
28 local t_concat, t_insert = table.concat, table.insert;
29 local tostring = tostring;
30 local jid_split = require "util.jid".split
31 local md5 = require "util.hashes".md5;
33 local log = require "util.logger".init("mod_saslauth");
35 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
36 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
37 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
39 local new_sasl = require "util.sasl".new;
41 local function build_reply(status, ret, err_msg)
42 local reply = st.stanza(status, {xmlns = xmlns_sasl});
43 if status == "challenge" then
44 reply:text(base64.encode(ret or ""));
45 elseif status == "failure" then
47 if err_msg then reply:tag("text"):text(err_msg); end
48 elseif status == "success" then
49 reply:text(base64.encode(ret or ""));
51 error("Unknown sasl status: "..status);
56 local function handle_status(session, status)
57 if status == "failure" then
58 session.sasl_handler = nil;
59 elseif status == "success" then
60 if not session.sasl_handler.username then error("SASL succeeded but we didn't get a username!"); end -- TODO move this to sessionmanager
61 sessionmanager.make_authenticated(session, session.sasl_handler.username);
62 session.sasl_handler = nil;
63 session:reset_stream();
67 local function password_callback(node, host, mechanism, raw_host)
68 local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords
69 local func = function(x) return x; end;
71 if mechanism == "PLAIN" then
72 return func, password;
73 elseif mechanism == "DIGEST-MD5" then
74 return func, md5(node..":"..raw_host..":"..password);
80 function sasl_handler(session, stanza)
81 if stanza.name == "auth" then
82 -- FIXME ignoring duplicates because ejabberd does
83 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
84 elseif not session.sasl_handler then
85 return; -- FIXME ignoring out of order stanzas because ejabberd does
87 local text = stanza[1];
89 text = base64.decode(text);
91 session.sasl_handler = nil;
92 session.send(build_reply("failure", "incorrect-encoding"));
96 local status, ret, err_msg = session.sasl_handler:feed(text);
97 handle_status(session, status);
98 local s = build_reply(status, ret, err_msg);
99 log("debug", "sasl reply: "..tostring(s));
103 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
104 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
105 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
107 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
108 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
109 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
110 module:add_event_hook("stream-features",
111 function (session, features)
112 if not session.username then
113 features:tag("mechanisms", mechanisms_attr);
114 -- 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.
115 features:tag("mechanism"):text("PLAIN"):up();
116 features:tag("mechanism"):text("DIGEST-MD5"):up();
119 features:tag("bind", bind_attr):tag("required"):up():up();
120 features:tag("session", xmpp_session_attr):up();
124 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
125 function (session, stanza)
126 log("debug", "Client tried to bind to a resource");
128 if stanza.attr.type == "set" then
129 local bind = stanza.tags[1];
130 if bind and bind.attr.xmlns == xmlns_bind then
131 resource = bind:child_with_name("resource");
133 resource = resource[1];
137 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
139 session.send(st.error_reply(stanza, err_type, err, err_msg));
141 session.send(st.reply(stanza)
142 :tag("bind", { xmlns = xmlns_bind})
143 :tag("jid"):text(session.full_jid));
147 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
148 function (session, stanza)
149 log("debug", "Client tried to bind to a resource");
150 session.send(st.reply(stanza));