aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_component.lua
blob: 2fde57ee1610fac7b521b65635178896529ecccb (plain)
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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
-- 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.
--

module:set_global();

local t_concat = table.concat;
local traceback = debug.traceback;

local logger = require "util.logger";
local sha1 = require "util.hashes".sha1;
local st = require "util.stanza";

local jid_split = require "util.jid".split;
local new_xmpp_stream = require "util.xmppstream".new;
local uuid_gen = require "util.uuid".generate;

local core_process_stanza = prosody.core_process_stanza;
local hosts = prosody.hosts;

local log = module._log;

local sessions = module:shared("sessions");

function module.add_host(module)
	if module:get_host_type() ~= "component" then
		error("Don't load mod_component manually, it should be for a component, please see http://prosody.im/doc/components", 0);
	end
	
	local env = module.environment;
	env.connected = false;

	local send;

	local function on_destroy(session, err)
		env.connected = false;
		send = nil;
		session.on_destroy = nil;
	end
	
	-- Handle authentication attempts by component
	local function handle_component_auth(event)
		local session, stanza = event.origin, event.stanza;
		
		if session.type ~= "component_unauthed" then return; end
	
		if (not session.host) or #stanza.tags > 0 then
			(session.log or log)("warn", "Invalid component handshake for host: %s", session.host);
			session:close("not-authorized");
			return true;
		end
		
		local secret = module:get_option("component_secret");
		if not secret then
			(session.log or log)("warn", "Component attempted to identify as %s, but component_secret is not set", session.host);
			session:close("not-authorized");
			return true;
		end
		
		local supplied_token = t_concat(stanza);
		local calculated_token = sha1(session.streamid..secret, true);
		if supplied_token:lower() ~= calculated_token:lower() then
			module:log("info", "Component authentication failed for %s", session.host);
			session:close{ condition = "not-authorized", text = "Given token does not match calculated token" };
			return true;
		end
		
		if env.connected then
			module:log("error", "Second component attempted to connect, denying connection");
			session:close{ condition = "conflict", text = "Component already connected" };
			return true;
		end
		
		env.connected = true;
		send = session.send;
		session.on_destroy = on_destroy;
		session.component_validate_from = module:get_option_boolean("validate_from_addresses", true);
		session.type = "component";
		module:log("info", "External component successfully authenticated");
		session.send(st.stanza("handshake"));
	
		return true;
	end
	module:hook("stanza/jabber:component:accept:handshake", handle_component_auth);

	-- Handle stanzas addressed to this component
	local function handle_stanza(event)
		local stanza = event.stanza;
		if send then
			stanza.attr.xmlns = nil;
			send(stanza);
		else
			if stanza.name == "iq" and stanza.attr.type == "get" and stanza.attr.to == module.host then
				local query = stanza.tags[1];
				local node = query.attr.node;
				if query.name == "query" and query.attr.xmlns == "http://jabber.org/protocol/disco#info" and (not node or node == "") then
					local name = module:get_option_string("name");
					if name then
						event.origin.send(st.reply(stanza):tag("query", { xmlns = "http://jabber.org/protocol/disco#info" })
							:tag("identity", { category = "component", type = "generic", name = module:get_option_string("name", "Prosody") }))
						return true;
					end
				end
			end
			module:log("warn", "Component not connected, bouncing error for: %s", stanza:top_tag());
			if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
				event.origin.send(st.error_reply(stanza, "wait", "service-unavailable", "Component unavailable"));
			end
		end
		return true;
	end
	
	module:hook("iq/bare", handle_stanza, -1);
	module:hook("message/bare", handle_stanza, -1);
	module:hook("presence/bare", handle_stanza, -1);
	module:hook("iq/full", handle_stanza, -1);
	module:hook("message/full", handle_stanza, -1);
	module:hook("presence/full", handle_stanza, -1);
	module:hook("iq/host", handle_stanza, -1);
	module:hook("message/host", handle_stanza, -1);
	module:hook("presence/host", handle_stanza, -1);
end

--- Network and stream part ---

local xmlns_component = 'jabber:component:accept';

local listener = {};

--- Callbacks/data for xmppstream to handle streams for us ---

local stream_callbacks = { default_ns = xmlns_component };

local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";

function stream_callbacks.error(session, error, data, data2)
	if session.destroyed then return; end
	module:log("warn", "Error processing component stream: %s", tostring(error));
	if error == "no-stream" then
		session:close("invalid-namespace");
	elseif error == "parse-error" then
		session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
		session:close("not-well-formed");
	elseif error == "stream-error" then
		local condition, text = "undefined-condition";
		for child in data:children() do
			if child.attr.xmlns == xmlns_xmpp_streams then
				if child.name ~= "text" then
					condition = child.name;
				else
					text = child:get_text();
				end
				if condition ~= "undefined-condition" and text then
					break;
				end
			end
		end
		text = condition .. (text and (" ("..text..")") or "");
		session.log("info", "Session closed by remote with error: %s", text);
		session:close(nil, text);
	end
end

function stream_callbacks.streamopened(session, attr)
	if not hosts[attr.to] or not hosts[attr.to].modules.component then
		session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
		return;
	end
	session.host = attr.to;
	session.streamid = uuid_gen();
	session.notopen = nil;
	-- Return stream header
	session.send("<?xml version='1.0'?>");
	session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
			["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
end

function stream_callbacks.streamclosed(session)
	session.log("debug", "Received </stream:stream>");
	session:close();
end

local function handleerr(err) log("error", "Traceback[component]: %s", traceback(tostring(err), 2)); end
function stream_callbacks.handlestanza(session, stanza)
	-- Namespaces are icky.
	if not stanza.attr.xmlns and stanza.name == "handshake" then
		stanza.attr.xmlns = xmlns_component;
	end
	if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
		local from = stanza.attr.from;
		if from then
			if session.component_validate_from then
				local _, domain = jid_split(stanza.attr.from);
				if domain ~= session.host then
					-- Return error
					session.log("warn", "Component sent stanza with missing or invalid 'from' address");
					session:close{
						condition = "invalid-from";
						text = "Component tried to send from address <"..tostring(from)
							   .."> which is not in domain <"..tostring(session.host)..">";
					};
					return;
				end
			end
		else
			stanza.attr.from = session.host; -- COMPAT: Strictly we shouldn't allow this
		end
		if not stanza.attr.to then
			session.log("warn", "Rejecting stanza with no 'to' address");
			session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas"));
			return;
		end
	end

	if stanza then
		return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
	end
end

--- Closing a component connection
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
local function session_close(session, reason)
	if session.destroyed then return; end
	if session.conn then
		if session.notopen then
			session.send("<?xml version='1.0'?>");
			session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
		end
		if reason then
			if type(reason) == "string" then -- assume stream error
				module:log("info", "Disconnecting component, <stream:error> is: %s", reason);
				session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
			elseif type(reason) == "table" then
				if reason.condition then
					local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
					if reason.text then
						stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
					end
					if reason.extra then
						stanza:add_child(reason.extra);
					end
					module:log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
					session.send(stanza);
				elseif reason.name then -- a stanza
					module:log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
					session.send(reason);
				end
			end
		end
		session.send("</stream:stream>");
		session.conn:close();
		listener.ondisconnect(session.conn, "stream error");
	end
end

--- Component connlistener

function listener.onconnect(conn)
	local _send = conn.write;
	local session = { type = "component_unauthed", conn = conn, send = function (data) return _send(conn, tostring(data)); end };

	-- Logging functions --
	local conn_name = "jcp"..tostring(session):match("[a-f0-9]+$");
	session.log = logger.init(conn_name);
	session.close = session_close;
	
	session.log("info", "Incoming Jabber component connection");
	
	local stream = new_xmpp_stream(session, stream_callbacks);
	session.stream = stream;
	
	session.notopen = true;
	
	function session.reset_stream()
		session.notopen = true;
		session.stream:reset();
	end

	function session.data(conn, data)
		local ok, err = stream:feed(data);
		if ok then return; end
		module:log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
		session:close("not-well-formed");
	end
	
	session.dispatch_stanza = stream_callbacks.handlestanza;

	sessions[conn] = session;
end
function listener.onincoming(conn, data)
	local session = sessions[conn];
	session.data(conn, data);
end
function listener.ondisconnect(conn, err)
	local session = sessions[conn];
	if session then
		(session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
		if session.on_destroy then session:on_destroy(err); end
		sessions[conn] = nil;
		for k in pairs(session) do
			if k ~= "log" and k ~= "close" then
				session[k] = nil;
			end
		end
		session.destroyed = true;
		session = nil;
	end
end

module:provides("net", {
	name = "component";
	private = true;
	listener = listener;
	default_port = 5347;
	multiplex = {
		pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:component:accept%1.*>";
	};
});