1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
local st = require "util.stanza";
local send = require "core.sessionmanager".send_to_session;
local sm_bind_resource = require "core.sessionmanager".bind_resource;
local jid
local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
local t_concat, t_insert = table.concat, table.insert;
local tostring = tostring;
local log = require "util.logger".init("mod_saslauth");
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 function build_reply(status, ret)
local reply = st.stanza(status, {xmlns = xmlns_sasl});
if status == "challenge" then
reply:text(ret or "");
elseif status == "failure" then
reply:tag(ret):up();
elseif status == "success" then
reply:text(ret or "");
else
error("Unknown sasl status: "..status);
end
return reply;
end
local function handle_status(session, status)
if status == "failure" then
session.sasl_handler = nil;
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 function password_callback(jid, mechanism)
local node, host = jid_split(jid);
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, require "hashes".md5(node.."::"..password);
end
end
return func, nil;
end
function do_sasl(session, stanza)
local text = stanza[1];
if text then
text = base64.decode(text);
if not text then
session.sasl_handler = nil;
session.send(build_reply("failure", "incorrect-encoding"));
return;
end
end
local status, ret = session.sasl_handler:feed(text);
handle_status(session, status);
session.send(build_reply(status, ret));
end
add_handler("c2s_unauthed", "auth", xmlns_sasl,
function (session, stanza)
if not session.sasl_handler then
session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
do_sasl(session, stanza);
else
error("Client tried to negotiate SASL again", 0);
end
end);
add_handler("c2s_unauthed", "abort", xmlns_sasl,
function(session, stanza)
if not session.sasl_handler then error("Attempt to abort when sasl has not started"); end
do_sasl(session, stanza);
end);
add_handler("c2s_unauthed", "response", xmlns_sasl,
function(session, stanza)
if not session.sasl_handler then error("Attempt to respond when sasl has not started"); end
do_sasl(session, stanza);
end);
add_event_hook("stream-features",
function (session, features)
if not session.username then
t_insert(features, "<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>");
t_insert(features, "<mechanism>PLAIN</mechanism>");
t_insert(features, "</mechanisms>");
else
t_insert(features, "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><required/></bind>");
t_insert(features, "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>");
end
--send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
end);
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
end
local success, err = sm_bind_resource(session, resource);
if not success then
local reply = st.reply(stanza);
reply.attr.type = "error";
if err == "conflict" then
reply:tag("error", { type = "modify" })
:tag("conflict", { xmlns = xmlns_stanzas });
elseif err == "constraint" then
reply:tag("error", { type = "cancel" })
:tag("resource-constraint", { xmlns = xmlns_stanzas });
elseif err == "auth" then
reply:tag("error", { type = "cancel" })
:tag("not-allowed", { xmlns = xmlns_stanzas });
end
send(session, reply);
else
local reply = st.reply(stanza);
reply:tag("bind", { xmlns = xmlns_bind})
:tag("jid"):text(session.full_jid);
send(session, reply);
end
end);
add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
function (session, stanza)
log("debug", "Client tried to bind to a resource");
send(session, st.reply(stanza));
end);
|
