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
|
-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 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 datamanager_load = require "util.datamanager".load;
local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods;
local usermanager_user_exists = require "core.usermanager".user_exists;
local usermanager_get_password = require "core.usermanager".get_password;
local t_concat, t_insert = table.concat, table.insert;
local tostring = tostring;
local jid_split = require "util.jid".split;
local md5 = require "util.hashes".md5;
local config = require "core.configmanager";
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 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 == "cyrus" then
local cyrus_new = require "util.sasl_cyrus".new;
new_sasl = function(realm)
return cyrus_new(realm, module:get_option("cyrus_service_name") or "xmpp");
end
else
if sasl_backend ~= "builtin" then module:log("warn", "Unknown SASL backend %s", sasl_backend); end;
new_sasl = require "util.sasl".new;
end
local default_authentication_profile = {
plain = function(username, realm)
local prepped_username = nodeprep(username);
if not prepped_username then
log("debug", "NODEprep failed on username: %s", username);
return "", nil;
end
local password = usermanager_get_password(prepped_username, realm);
if not password then
return "", nil;
end
return password, true;
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", "%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", "%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)
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 username then -- TODO move this to sessionmanager
module:log("warn", "SASL succeeded but we didn't get a username!");
session.sasl_handler = nil;
session:reset_stream();
return;
end
sm_make_authenticated(session, session.sasl_handler.username);
session.sasl_handler = nil;
session:reset_stream();
end
end
local function sasl_handler(session, stanza)
if stanza.name == "auth" then
-- FIXME ignoring duplicates because ejabberd does
if config.get(session.host or "*", "core", "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
local valid_mechanism = session.sasl_handler:select(stanza.attr.mechanism);
if not valid_mechanism then
return session.send(build_reply("failure", "invalid-mechanism"));
end
if secure_auth_only and not session.secure then
return session.send(build_reply("failure", "encryption-required"));
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", "%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);
handle_status(session, status);
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:add_event_hook("stream-features", function(session, features)
if not session.username then
if secure_auth_only and not session.secure then
return;
end
if module:get_option("anonymous_login") then
session.sasl_handler = new_sasl(session.host, anonymous_authentication_profile);
else
session.sasl_handler = new_sasl(session.host, default_authentication_profile);
if not (module:get_option("allow_unencrypted_plain_auth")) and not session.secure then
session.sasl_handler:forbidden({"PLAIN"});
end
end
features:tag("mechanisms", mechanisms_attr);
for k, v in pairs(session.sasl_handler:mechanisms()) do
features:tag("mechanism"):text(v):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);
|
