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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
local dt = require "util.datetime";
local base64 = require "util.encodings".base64;
local hashes = require "util.hashes";
local st = require "util.stanza";
local jid = require "util.jid";
local array = require "util.array";
local default_host = module:get_option_string("external_service_host", module.host);
local default_port = module:get_option_number("external_service_port");
local default_secret = module:get_option_string("external_service_secret");
local default_ttl = module:get_option_number("external_service_ttl", 86400);
local configured_services = module:get_option_array("external_services", {});
local access = module:get_option_set("external_service_access", {});
-- https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
local function behave_turn_rest_credentials(srv, item, secret)
local ttl = default_ttl;
if type(item.ttl) == "number" then
ttl = item.ttl;
end
local expires = srv.expires or os.time() + ttl;
local username;
if type(item.username) == "string" then
username = string.format("%d:%s", expires, item.username);
else
username = string.format("%d", expires);
end
srv.username = username;
srv.password = base64.encode(hashes.hmac_sha1(secret, srv.username));
end
local algorithms = {
turn = behave_turn_rest_credentials;
}
-- filter config into well-defined service records
local function prepare(item)
if type(item) ~= "table" then
module:log("error", "Service definition is not a table: %q", item);
return nil;
end
local srv = {
type = nil;
transport = nil;
host = default_host;
port = default_port;
username = nil;
password = nil;
restricted = nil;
expires = nil;
};
if type(item.type) == "string" then
srv.type = item.type;
else
module:log("error", "Service missing mandatory 'type' field: %q", item);
return nil;
end
if type(item.transport) == "string" then
srv.transport = item.transport;
end
if type(item.host) == "string" then
srv.host = item.host;
end
if type(item.port) == "number" then
srv.port = item.port;
end
if type(item.username) == "string" then
srv.username = item.username;
end
if type(item.password) == "string" then
srv.password = item.password;
srv.restricted = true;
end
if item.restricted == true then
srv.restricted = true;
end
if type(item.expires) == "number" then
srv.expires = item.expires;
elseif type(item.ttl) == "number" then
srv.expires = os.time() + item.ttl;
end
if (item.secret == true and default_secret) or type(item.secret) == "string" then
local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
local secret = item.secret;
if secret == true then
secret = default_secret;
end
if secret_cb then
secret_cb(srv, item, secret);
srv.restricted = true;
end
end
return srv;
end
function module.load()
-- Trigger errors on startup
local extras = module:get_host_items("external_service");
local services = ( configured_services + extras ) / prepare;
if #services == 0 then
module:set_status("warn", "No services configured or all had errors");
end
end
module:handle_items("external_service", function(added)
if prepare(added.item) then
module:set_status("core", "OK");
end
end, module.load);
-- Ensure only valid items are added in events
local services_mt = {
__index = getmetatable(array()).__index;
__newindex = function (self, i, v)
rawset(self, i, assert(prepare(v), "Invalid service entry added"));
end;
}
local function handle_services(event)
local origin, stanza = event.origin, event.stanza;
local action = stanza.tags[1];
local user_bare = jid.bare(stanza.attr.from);
local user_host = jid.host(user_bare);
if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
origin.send(st.error_reply(stanza, "auth", "forbidden"));
return true;
end
local reply = st.reply(stanza):tag("services", { xmlns = action.attr.xmlns });
local extras = module:get_host_items("external_service");
local services = ( configured_services + extras ) / prepare;
local requested_type = action.attr.type;
if requested_type then
services:filter(function(item)
return item.type == requested_type;
end);
end
setmetatable(services, services_mt);
module:fire_event("external_service/services", {
origin = origin;
stanza = stanza;
reply = reply;
requested_type = requested_type;
services = services;
});
for _, srv in ipairs(services) do
reply:tag("service", {
type = srv.type;
transport = srv.transport;
host = srv.host;
port = srv.port and string.format("%d", srv.port) or nil;
username = srv.username;
password = srv.password;
expires = srv.expires and dt.datetime(srv.expires) or nil;
restricted = srv.restricted and "1" or nil;
}):up();
end
origin.send(reply);
return true;
end
local function handle_credentials(event)
local origin, stanza = event.origin, event.stanza;
local action = stanza.tags[1];
if origin.type ~= "c2s" then
origin.send(st.error_reply(stanza, "auth", "forbidden"));
return true;
end
local reply = st.reply(stanza):tag("credentials", { xmlns = action.attr.xmlns });
local extras = module:get_host_items("external_service");
local services = ( configured_services + extras ) / prepare;
services:filter(function (item)
return item.restricted;
end)
local requested_credentials = {};
for service in action:childtags("service") do
table.insert(requested_credentials, {
type = service.attr.type;
host = service.attr.host;
port = tonumber(service.attr.port);
});
end
setmetatable(services, services_mt);
setmetatable(requested_credentials, services_mt);
module:fire_event("external_service/credentials", {
origin = origin;
stanza = stanza;
reply = reply;
requested_credentials = requested_credentials;
services = services;
});
for req_srv in action:childtags("service") do
for _, srv in ipairs(services) do
if srv.type == req_srv.attr.type and srv.host == req_srv.attr.host
and not req_srv.attr.port or srv.port == tonumber(req_srv.attr.port) then
reply:tag("service", {
type = srv.type;
transport = srv.transport;
host = srv.host;
port = srv.port and string.format("%d", srv.port) or nil;
username = srv.username;
password = srv.password;
expires = srv.expires and dt.datetime(srv.expires) or nil;
restricted = srv.restricted and "1" or nil;
}):up();
end
end
end
origin.send(reply);
return true;
end
-- XEP-0215 v0.7
module:add_feature("urn:xmpp:extdisco:2");
module:hook("iq-get/host/urn:xmpp:extdisco:2:services", handle_services);
module:hook("iq-get/host/urn:xmpp:extdisco:2:credentials", handle_credentials);
-- COMPAT XEP-0215 v0.6
-- Those still on the old version gets to deal with undefined attributes until they upgrade.
module:add_feature("urn:xmpp:extdisco:1");
module:hook("iq-get/host/urn:xmpp:extdisco:1:services", handle_services);
module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);
|
