aboutsummaryrefslogtreecommitdiffstats
path: root/util/adminstream.lua
blob: 8611310a02d4a38434e0c01fe619f80a118fe1fa (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
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
local st = require "util.stanza";
local new_xmpp_stream = require "util.xmppstream".new;
local sessionlib = require "util.session";
local gettime = require "util.time".now;
local runner = require "util.async".runner;
local add_task = require "util.timer".add_task;
local events = require "util.events";
local server = require "net.server";

local stream_close_timeout = 5;

local log = require "util.logger".init("adminstream");

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

local stream_callbacks = { default_ns = "xmpp:prosody.im/admin" };

function stream_callbacks.streamopened(session, attr)
	-- run _streamopened in async context
	session.thread:run({ stream = "opened", attr = attr });
end

function stream_callbacks._streamopened(session, attr) --luacheck: ignore 212/attr
	if session.type ~= "client" then
		session:open_stream();
	end
	session.notopen = nil;
end

function stream_callbacks.streamclosed(session, attr)
	-- run _streamclosed in async context
	session.thread:run({ stream = "closed", attr = attr });
end

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

function stream_callbacks.error(session, error, data)
	if error == "no-stream" then
		session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}")));
		session:close("invalid-namespace");
	elseif error == "parse-error" then
		session.log("debug", "Client XML parse error: %s", data);
		session:close("not-well-formed");
	elseif error == "stream-error" then
		local condition, text = "undefined-condition";
		for child in data:childtags(nil, xmlns_xmpp_streams) do
			if child.name ~= "text" then
				condition = child.name;
			else
				text = child:get_text();
			end
			if condition ~= "undefined-condition" and text then
				break;
			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.handlestanza(session, stanza)
	session.thread:run(stanza);
end

local runner_callbacks = {};

function runner_callbacks:error(err)
	self.data.log("error", "Traceback[c2s]: %s", err);
end

local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};

local function destroy_session(session, reason)
	if session.destroyed then return; end
	session.destroyed = true;
	session.log("debug", "Destroying session: %s", reason or "unknown reason");
end

local function session_close(session, reason)
	local log = session.log or log;
	if session.conn then
		if session.notopen then
			session:open_stream();
		end
		if reason then -- nil == no err, initiated by us, false == initiated by client
			local stream_error = st.stanza("stream:error");
			if type(reason) == "string" then -- assume stream error
				stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
			elseif type(reason) == "table" then
				if reason.condition then
					stream_error:tag(reason.condition, stream_xmlns_attr):up();
					if reason.text then
						stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
					end
					if reason.extra then
						stream_error:add_child(reason.extra);
					end
				elseif reason.name then -- a stanza
					stream_error = reason;
				end
			end
			stream_error = tostring(stream_error);
			log("debug", "Disconnecting client, <stream:error> is: %s", stream_error);
			session.send(stream_error);
		end

		session.send("</stream:stream>");
		function session.send() return false; end

		local reason_text = (reason and (reason.name or reason.text or reason.condition)) or reason;
		session.log("debug", "c2s stream for %s closed: %s", session.full_jid or session.ip or "<unknown>", reason_text or "session closed");

		-- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
		local conn = session.conn;
		if reason_text == nil and not session.notopen and session.type == "c2s" then
			-- Grace time to process data from authenticated cleanly-closed stream
			add_task(stream_close_timeout, function ()
				if not session.destroyed then
					session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
					destroy_session(session);
					conn:close();
				end
			end);
		else
			destroy_session(session, reason_text);
			conn:close();
		end
	else
		local reason_text = (reason and (reason.name or reason.text or reason.condition)) or reason;
		destroy_session(session, reason_text);
	end
end

--- Public methods

local function new_connection(socket_path, listeners)
	local have_unix, unix = pcall(require, "socket.unix");
	if have_unix and type(unix) == "function" then
		unix = { stream = unix };
	end
	if type(unix) ~= "table" then
		have_unix = false;
	end
	local conn, sock;

	return {
		connect = function ()
			if not have_unix then
				return nil, "no unix socket support";
			end
			if sock or conn then
				return nil, "already connected";
			end
			sock = unix.stream();
			sock:settimeout(0);
			local ok, err = sock:connect(socket_path);
			if not ok then
				return nil, err;
			end
			conn = server.wrapclient(sock, nil, nil, listeners, "*a");
			return true;
		end;
		disconnect = function ()
			if conn then
				conn:close();
				conn = nil;
			end
			if sock then
				sock:close();
				sock = nil;
			end
			return true;
		end;
	};
end

local function new_server(sessions, stanza_handler)
	local listeners = {};

	function listeners.onconnect(conn)
		log("debug", "New connection");
		local session = sessionlib.new("admin");
		sessionlib.set_id(session);
		sessionlib.set_logger(session);
		sessionlib.set_conn(session, conn);

		session.conntime = gettime();
		session.type = "admin";

		local stream = new_xmpp_stream(session, stream_callbacks);
		session.stream = stream;
		session.notopen = true;

		session.thread = runner(function (stanza)
			if st.is_stanza(stanza) then
				stanza_handler(session, stanza);
			elseif stanza.stream == "opened" then
				stream_callbacks._streamopened(session, stanza.attr);
			elseif stanza.stream == "closed" then
				stream_callbacks._streamclosed(session, stanza.attr);
			end
		end, runner_callbacks, session);

		function session.data(data)
			-- Parse the data, which will store stanzas in session.pending_stanzas
			if data then
				local ok, err = stream:feed(data);
				if not ok then
					session.log("debug", "Received invalid XML (%s) %d bytes: %q", err, #data, data:sub(1, 300));
					session:close("not-well-formed");
				end
			end
		end

		session.close = session_close;

		session.send = function (t)
			session.log("debug", "Sending[%s]: %s", session.type, t.top_tag and t:top_tag() or t:match("^[^>]*>?"));
			return session.rawsend(tostring(t));
		end

		function session.rawsend(t)
			local ret, err = conn:write(t);
			if not ret then
				session.log("debug", "Error writing to connection: %s", err);
				return false, err;
			end
			return true;
		end

		sessions[conn] = session;
	end

	function listeners.onincoming(conn, data)
		local session = sessions[conn];
		if session then
			session.data(data);
		end
	end

	function listeners.ondisconnect(conn, err)
		local session = sessions[conn];
		if session then
			session.log("info", "Admin client disconnected: %s", err or "connection closed");
			session.conn = nil;
			sessions[conn]  = nil;
		end
	end

	function listeners.onreadtimeout(conn)
		return conn:send(" ");
	end

	return {
		listeners = listeners;
	};
end

local function new_client()
	local client = {
		type = "client";
		events = events.new();
		log = log;
	};

	local listeners = {};

	function listeners.onconnect(conn)
		log("debug", "Connected");
		client.conn = conn;

		local stream = new_xmpp_stream(client, stream_callbacks);
		client.stream = stream;
		client.notopen = true;

		client.thread = runner(function (stanza)
			if st.is_stanza(stanza) then
				if not client.events.fire_event("received", stanza) and not stanza.attr.xmlns then
					client.events.fire_event("received/"..stanza.name, stanza);
				end
			elseif stanza.stream == "opened" then
				stream_callbacks._streamopened(client, stanza.attr);
				client.events.fire_event("connected");
			elseif stanza.stream == "closed" then
				client.events.fire_event("disconnected");
				stream_callbacks._streamclosed(client, stanza.attr);
			end
		end, runner_callbacks, client);

		client.close = session_close;

		function client.send(t)
			client.log("debug", "Sending: %s", t.top_tag and t:top_tag() or t:match("^[^>]*>?"));
			return client.rawsend(tostring(t));
		end

		function client.rawsend(t)
			local ret, err = conn:write(t);
			if not ret then
				client.log("debug", "Error writing to connection: %s", err);
				return false, err;
			end
			return true;
		end
		client.log("debug", "Opening stream...");
		client:open_stream();
	end

	function listeners.onincoming(conn, data) --luacheck: ignore 212/conn
		local ok, err = client.stream:feed(data);
		if not ok then
			client.log("debug", "Received invalid XML (%s) %d bytes: %q", err, #data, data:sub(1, 300));
			client:close("not-well-formed");
		end
	end

	function listeners.ondisconnect(conn, err) --luacheck: ignore 212/conn
		client.log("info", "Admin client disconnected: %s", err or "connection closed");
		client.conn = nil;
		client.events.fire_event("disconnected");
	end

	function listeners.onreadtimeout(conn)
		conn:send(" ");
	end

	client.listeners = listeners;

	return client;
end

return {
	connection = new_connection;
	server = new_server;
	client = new_client;
};