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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
-- 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 usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
local usermanager_user_exists = require "core.usermanager".user_exists;
local t_concat, t_insert = table.concat, table.insert;
local tostring = tostring;
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";
local anonymous_login = module:get_option("anonymous_login");
-- 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;
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 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", "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", "SUCCESS: %s", ret or "");
reply:text(base64.encode(ret or ""));
else
module:log("error", "Unknown sasl status: %s", status);
end
return reply;
end
local function handle_status(session, status, ret, err_msg)
if status == "failure" then
session.sasl_handler = session.sasl_handler:clean_clone();
elseif status == "success" then
local username = nodeprep(session.sasl_handler.username);
if not(require_provisioning) or usermanager_user_exists(username, session.host) then
local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
if ok 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 status, ret, err_msg;
end
local function sasl_handler(session, stanza)
if stanza.name == "auth" then
-- FIXME ignoring duplicates because ejabberd does
if 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
if secure_auth_only and not session.secure then
return session.send(build_reply("failure", "encryption-required"));
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
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", "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: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
module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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: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
if anonymous_login then
origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile);
else
origin.sasl_handler = usermanager_get_sasl_handler(module.host);
if not (module:get_option("allow_unencrypted_plain_auth")) and not origin.secure then
origin.sasl_handler:forbidden({"PLAIN"});
end
end
features:tag("mechanisms", mechanisms_attr);
for k in pairs(origin.sasl_handler:mechanisms()) do
features:tag("mechanism"):text(k):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
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);
|
