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comparison plugins/mod_s2s/mod_s2s.lua @ 4814:474684c07a3a

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Rename plugins/s2s/ to plugins/mod_s2s/
author Matthew Wild <mwild1@gmail.com>
date Fri, 04 May 2012 00:05:15 +0100
parents plugins/s2s/mod_s2s.lua@e8bd0a6f45e2
children 3bda6fc02652
comparison
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4813:77da9671ac39 4814:474684c07a3a
1 -- Prosody IM
2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
4 --
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
7 --
8
9 module:set_global();
10
11 local prosody = prosody;
12 local hosts = prosody.hosts;
13 local core_process_stanza = core_process_stanza;
14
15 local tostring, type = tostring, type;
16 local t_insert = table.insert;
17 local xpcall, traceback = xpcall, debug.traceback;
18
19 local add_task = require "util.timer".add_task;
20 local st = require "util.stanza";
21 local initialize_filters = require "util.filters".initialize;
22 local nameprep = require "util.encodings".stringprep.nameprep;
23 local new_xmpp_stream = require "util.xmppstream".new;
24 local s2s_new_incoming = require "core.s2smanager".new_incoming;
25 local s2s_new_outgoing = require "core.s2smanager".new_outgoing;
26 local s2s_destroy_session = require "core.s2smanager".destroy_session;
27 local s2s_mark_connected = require "core.s2smanager".mark_connected;
28 local uuid_gen = require "util.uuid".generate;
29 local cert_verify_identity = require "util.x509".verify_identity;
30
31 local s2sout = module:require("s2sout");
32
33 local connect_timeout = module:get_option_number("s2s_timeout", 60);
34
35 local sessions = module:shared("sessions");
36
37 local log = module._log;
38
39 --- Handle stanzas to remote domains
40
41 local bouncy_stanzas = { message = true, presence = true, iq = true };
42 local function bounce_sendq(session, reason)
43 local sendq = session.sendq;
44 if not sendq then return; end
45 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
46 local dummy = {
47 type = "s2sin";
48 send = function(s)
49 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
50 end;
51 dummy = true;
52 };
53 for i, data in ipairs(sendq) do
54 local reply = data[2];
55 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
56 reply.attr.type = "error";
57 reply:tag("error", {type = "cancel"})
58 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
59 if reason then
60 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
61 :text("Server-to-server connection failed: "..reason):up();
62 end
63 core_process_stanza(dummy, reply);
64 end
65 sendq[i] = nil;
66 end
67 session.sendq = nil;
68 end
69
70 module:hook("route/remote", function (event)
71 local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
72 if not hosts[from_host] then
73 log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host);
74 return false;
75 end
76 local host = hosts[from_host].s2sout[to_host];
77 if host then
78 -- We have a connection to this host already
79 if host.type == "s2sout_unauthed" and (stanza.name ~= "db:verify" or not host.dialback_key) then
80 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
81
82 -- Queue stanza until we are able to send it
83 if host.sendq then t_insert(host.sendq, {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)});
84 else host.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} }; end
85 host.log("debug", "stanza [%s] queued ", stanza.name);
86 return true;
87 elseif host.type == "local" or host.type == "component" then
88 log("error", "Trying to send a stanza to ourselves??")
89 log("error", "Traceback: %s", traceback());
90 log("error", "Stanza: %s", tostring(stanza));
91 return false;
92 else
93 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host);
94 -- FIXME
95 if host.from_host ~= from_host then
96 log("error", "WARNING! This might, possibly, be a bug, but it might not...");
97 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host));
98 end
99 host.sends2s(stanza);
100 host.log("debug", "stanza sent over "..host.type);
101 return true;
102 end
103 end
104 end, 200);
105
106 module:hook("route/remote", function (event)
107 local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
108 log("debug", "opening a new outgoing connection for this stanza");
109 local host_session = s2s_new_outgoing(from_host, to_host);
110
111 -- Store in buffer
112 host_session.bounce_sendq = bounce_sendq;
113 host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
114 log("debug", "stanza [%s] queued until connection complete", tostring(stanza.name));
115 s2sout.initiate_connection(host_session);
116 if (not host_session.connecting) and (not host_session.conn) then
117 log("warn", "Connection to %s failed already, destroying session...", to_host);
118 s2s_destroy_session(host_session, "Connection failed");
119 return false;
120 end
121 return true;
122 end, 100);
123
124 --- Helper to check that a session peer's certificate is valid
125 local function check_cert_status(session)
126 local conn = session.conn:socket()
127 local cert
128 if conn.getpeercertificate then
129 cert = conn:getpeercertificate()
130 end
131
132 if cert then
133 local chain_valid, errors = conn:getpeerverification()
134 -- Is there any interest in printing out all/the number of errors here?
135 if not chain_valid then
136 (session.log or log)("debug", "certificate chain validation result: invalid");
137 for depth, t in ipairs(errors) do
138 (session.log or log)("debug", "certificate error(s) at depth %d: %s", depth-1, table.concat(t, ", "))
139 end
140 session.cert_chain_status = "invalid";
141 else
142 (session.log or log)("debug", "certificate chain validation result: valid");
143 session.cert_chain_status = "valid";
144
145 local host = session.direction == "incoming" and session.from_host or session.to_host
146
147 -- We'll go ahead and verify the asserted identity if the
148 -- connecting server specified one.
149 if host then
150 if cert_verify_identity(host, "xmpp-server", cert) then
151 session.cert_identity_status = "valid"
152 else
153 session.cert_identity_status = "invalid"
154 end
155 end
156 end
157 end
158 end
159
160 --- XMPP stream event handlers
161
162 local stream_callbacks = { default_ns = "jabber:server", handlestanza = core_process_stanza };
163
164 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
165
166 function stream_callbacks.streamopened(session, attr)
167 local send = session.sends2s;
168
169 -- TODO: #29: SASL/TLS on s2s streams
170 session.version = tonumber(attr.version) or 0;
171
172 -- TODO: Rename session.secure to session.encrypted
173 if session.secure == false then
174 session.secure = true;
175 end
176
177 if session.direction == "incoming" then
178 -- Send a reply stream header
179
180 -- Validate to/from
181 local to, from = nameprep(attr.to), nameprep(attr.from);
182 if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts)
183 session:close({ condition = "improper-addressing", text = "Invalid 'to' address" });
184 return;
185 end
186 if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts)
187 session:close({ condition = "improper-addressing", text = "Invalid 'from' address" });
188 return;
189 end
190
191 -- Set session.[from/to]_host if they have not been set already and if
192 -- this session isn't already authenticated
193 if session.type == "s2sin_unauthed" and from and not session.from_host then
194 session.from_host = from;
195 elseif from ~= session.from_host then
196 session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" });
197 return;
198 end
199 if session.type == "s2sin_unauthed" and to and not session.to_host then
200 session.to_host = to;
201 elseif to ~= session.to_host then
202 session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" });
203 return;
204 end
205
206 session.streamid = uuid_gen();
207 (session.log or log)("debug", "Incoming s2s received %s", st.stanza("stream:stream", attr):top_tag());
208 if session.to_host then
209 if not hosts[session.to_host] then
210 -- Attempting to connect to a host we don't serve
211 session:close({
212 condition = "host-unknown";
213 text = "This host does not serve "..session.to_host
214 });
215 return;
216 elseif hosts[session.to_host].disallow_s2s then
217 -- Attempting to connect to a host that disallows s2s
218 session:close({
219 condition = "policy-violation";
220 text = "Server-to-server communication is not allowed to this host";
221 });
222 return;
223 end
224 end
225
226 if session.secure and not session.cert_chain_status then check_cert_status(session); end
227
228 send("<?xml version='1.0'?>");
229 send(st.stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
230 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host, to=session.from_host, version=(session.version > 0 and "1.0" or nil) }):top_tag());
231 if session.version >= 1.0 then
232 local features = st.stanza("stream:features");
233
234 if session.to_host then
235 hosts[session.to_host].events.fire_event("s2s-stream-features", { origin = session, features = features });
236 else
237 (session.log or log)("warn", "No 'to' on stream header from %s means we can't offer any features", session.from_host or "unknown host");
238 end
239
240 log("debug", "Sending stream features: %s", tostring(features));
241 send(features);
242 end
243 elseif session.direction == "outgoing" then
244 -- If we are just using the connection for verifying dialback keys, we won't try and auth it
245 if not attr.id then error("stream response did not give us a streamid!!!"); end
246 session.streamid = attr.id;
247
248 if session.secure and not session.cert_chain_status then check_cert_status(session); end
249
250 -- Send unauthed buffer
251 -- (stanzas which are fine to send before dialback)
252 -- Note that this is *not* the stanza queue (which
253 -- we can only send if auth succeeds) :)
254 local send_buffer = session.send_buffer;
255 if send_buffer and #send_buffer > 0 then
256 log("debug", "Sending s2s send_buffer now...");
257 for i, data in ipairs(send_buffer) do
258 session.sends2s(tostring(data));
259 send_buffer[i] = nil;
260 end
261 end
262 session.send_buffer = nil;
263
264 -- If server is pre-1.0, don't wait for features, just do dialback
265 if session.version < 1.0 then
266 if not session.dialback_verifying then
267 hosts[session.from_host].events.fire_event("s2s-authenticate-legacy", { origin = session });
268 else
269 s2s_mark_connected(session);
270 end
271 end
272 end
273 session.notopen = nil;
274 session.send = function(stanza) prosody.events.fire_event("route/remote", { from_host = session.to_host, to_host = session.from_host, stanza = stanza}) end;
275 end
276
277 function stream_callbacks.streamclosed(session)
278 (session.log or log)("debug", "Received </stream:stream>");
279 session:close();
280 end
281
282 function stream_callbacks.streamdisconnected(session, err)
283 if err and err ~= "closed" and session.direction == "outgoing" then
284 (session.log or log)("debug", "s2s connection attempt failed: %s", err);
285 if s2sout.attempt_connection(session, err) then
286 (session.log or log)("debug", "...so we're going to try another target");
287 return true; -- Session lives for now
288 end
289 end
290 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "closed"));
291 s2s_destroy_session(session, err);
292 end
293
294 function stream_callbacks.error(session, error, data)
295 if error == "no-stream" then
296 session:close("invalid-namespace");
297 elseif error == "parse-error" then
298 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
299 session:close("not-well-formed");
300 elseif error == "stream-error" then
301 local condition, text = "undefined-condition";
302 for child in data:children() do
303 if child.attr.xmlns == xmlns_xmpp_streams then
304 if child.name ~= "text" then
305 condition = child.name;
306 else
307 text = child:get_text();
308 end
309 if condition ~= "undefined-condition" and text then
310 break;
311 end
312 end
313 end
314 text = condition .. (text and (" ("..text..")") or "");
315 session.log("info", "Session closed by remote with error: %s", text);
316 session:close(nil, text);
317 end
318 end
319
320 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), traceback()); end
321 function stream_callbacks.handlestanza(session, stanza)
322 if stanza.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
323 stanza.attr.xmlns = nil;
324 end
325 stanza = session.filter("stanzas/in", stanza);
326 if stanza then
327 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
328 end
329 end
330
331 local listener = {};
332
333 --- Session methods
334 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
335 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
336 local function session_close(session, reason, remote_reason)
337 local log = session.log or log;
338 if session.conn then
339 if session.notopen then
340 session.sends2s("<?xml version='1.0'?>");
341 session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
342 end
343 if reason then
344 if type(reason) == "string" then -- assume stream error
345 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
346 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
347 elseif type(reason) == "table" then
348 if reason.condition then
349 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
350 if reason.text then
351 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
352 end
353 if reason.extra then
354 stanza:add_child(reason.extra);
355 end
356 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
357 session.sends2s(stanza);
358 elseif reason.name then -- a stanza
359 log("info", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));
360 session.sends2s(reason);
361 end
362 end
363 end
364 session.sends2s("</stream:stream>");
365 if session.notopen or not session.conn:close() then
366 session.conn:close(true); -- Force FIXME: timer?
367 end
368 session.conn:close();
369 listener.ondisconnect(session.conn, remote_reason or (reason and (reason.text or reason.condition)) or reason or "stream closed");
370 end
371 end
372
373 -- Session initialization logic shared by incoming and outgoing
374 local function initialize_session(session)
375 local stream = new_xmpp_stream(session, stream_callbacks);
376 session.stream = stream;
377
378 session.notopen = true;
379
380 function session.reset_stream()
381 session.notopen = true;
382 session.stream:reset();
383 end
384
385 local filter = session.filter;
386 function session.data(data)
387 data = filter("bytes/in", data);
388 if data then
389 local ok, err = stream:feed(data);
390 if ok then return; end
391 (session.log or log)("warn", "Received invalid XML: %s", data);
392 (session.log or log)("warn", "Problem was: %s", err);
393 session:close("not-well-formed");
394 end
395 end
396
397 session.close = session_close;
398
399 local handlestanza = stream_callbacks.handlestanza;
400 function session.dispatch_stanza(session, stanza)
401 return handlestanza(session, stanza);
402 end
403
404 local conn = session.conn;
405 add_task(connect_timeout, function ()
406 if session.conn ~= conn or session.connecting
407 or session.type == "s2sin" or session.type == "s2sout" then
408 return; -- Ok, we're connect[ed|ing]
409 end
410 -- Not connected, need to close session and clean up
411 (session.log or log)("debug", "Destroying incomplete session %s->%s due to inactivity",
412 session.from_host or "(unknown)", session.to_host or "(unknown)");
413 session:close("connection-timeout");
414 end);
415 end
416
417 function listener.onconnect(conn)
418 if not sessions[conn] then -- May be an existing outgoing session
419 local session = s2s_new_incoming(conn);
420 sessions[conn] = session;
421 session.log("debug", "Incoming s2s connection");
422
423 local filter = initialize_filters(session);
424 local w = conn.write;
425 session.sends2s = function (t)
426 log("debug", "sending: %s", t.top_tag and t:top_tag() or t:match("^([^>]*>?)"));
427 if t.name then
428 t = filter("stanzas/out", t);
429 end
430 if t then
431 t = filter("bytes/out", tostring(t));
432 if t then
433 return w(conn, t);
434 end
435 end
436 end
437
438 initialize_session(session);
439 end
440 end
441
442 function listener.onincoming(conn, data)
443 local session = sessions[conn];
444 if session then
445 session.data(data);
446 end
447 end
448
449 function listener.onstatus(conn, status)
450 if status == "ssl-handshake-complete" then
451 local session = sessions[conn];
452 if session and session.direction == "outgoing" then
453 session.log("debug", "Sending stream header...");
454 session:open_stream(session.from_host, session.to_host);
455 end
456 end
457 end
458
459 function listener.ondisconnect(conn, err)
460 local session = sessions[conn];
461 if session then
462 if stream_callbacks.streamdisconnected(session, err) then
463 return; -- Connection lives, for now
464 end
465 end
466 sessions[conn] = nil;
467 end
468
469 function listener.register_outgoing(conn, session)
470 session.direction = "outgoing";
471 sessions[conn] = session;
472 initialize_session(session);
473 end
474
475 s2sout.set_listener(listener);
476
477 module:add_item("net-provider", {
478 name = "s2s";
479 listener = listener;
480 default_port = 5269;
481 encryption = "starttls";
482 multiplex = {
483 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>";
484 };
485 });
486