plugins/mod_s2s/mod_s2s.lua

   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 = prosody.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 uuid_gen = require "util.uuid".generate;
  28 local fire_global_event = prosody.events.fire_event;
  29 local runner = require "util.async".runner;
  30
  31 local s2sout = module:require("s2sout");
  32
  33 local connect_timeout = module:get_option_number("s2s_timeout", 90);
  34 local stream_close_timeout = module:get_option_number("s2s_close_timeout", 5);
  35 local opt_keepalives = module:get_option_boolean("s2s_tcp_keepalives", module:get_option_boolean("tcp_keepalives", true));
  36 local secure_auth = module:get_option_boolean("s2s_secure_auth", false); -- One day...
  37 local secure_domains, insecure_domains =
  38         module:get_option_set("s2s_secure_domains", {})._items, module:get_option_set("s2s_insecure_domains", {})._items;
  39 local require_encryption = module:get_option_boolean("s2s_require_encryption", false);
  40
  41 local measure_connections = module:measure("connections", "counter");
  42
  43 local sessions = module:shared("sessions");
  44
  45 local runner_callbacks = {};
  46
  47 local log = module._log;
  48
  49 --- Handle stanzas to remote domains
  50
  51 local bouncy_stanzas = { message = true, presence = true, iq = true };
  52 local function bounce_sendq(session, reason)
  53         local sendq = session.sendq;
  54         if not sendq then return; end
  55         session.log("info", "Sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
  56         local dummy = {
  57                 type = "s2sin";
  58                 send = function(s)
  59                         (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
  60                 end;
  61                 dummy = true;
  62                 close = function ()
  63                         (session.log or log)("error", "Attempting to close the dummy origin of s2s error replies, please report this! Traceback: %s", traceback());
  64                 end;
  65         };
  66         for i, data in ipairs(sendq) do
  67                 local reply = data[2];
  68                 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
  69                         reply.attr.type = "error";
  70                         reply:tag("error", {type = "cancel"})
  71                                 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
  72                         if reason then
  73                                 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
  74                                         :text("Server-to-server connection failed: "..reason):up();
  75                         end
  76                         core_process_stanza(dummy, reply);
  77                 end
  78                 sendq[i] = nil;
  79         end
  80         session.sendq = nil;
  81 end
  82
  83 -- Handles stanzas to existing s2s sessions
  84 function route_to_existing_session(event)
  85         local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
  86         if not hosts[from_host] then
  87                 log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host);
  88                 return false;
  89         end
  90         if hosts[to_host] then
  91                 log("warn", "Attempt to route stanza to a remote %s - a host we do serve?!", from_host);
  92                 return false;
  93         end
  94         local host = hosts[from_host].s2sout[to_host];
  95         if host then
  96                 -- We have a connection to this host already
  97                 if host.type == "s2sout_unauthed" and (stanza.name ~= "db:verify" or not host.dialback_key) then
  98                         (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
  99
 100                         -- Queue stanza until we are able to send it
 101                         if host.sendq then t_insert(host.sendq, {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)});
 102                         else host.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} }; end
 103                         host.log("debug", "stanza [%s] queued ", stanza.name);
 104                         return true;
 105                 elseif host.type == "local" or host.type == "component" then
 106                         log("error", "Trying to send a stanza to ourselves??")
 107                         log("error", "Traceback: %s", traceback());
 108                         log("error", "Stanza: %s", tostring(stanza));
 109                         return false;
 110                 else
 111                         (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host);
 112                         -- FIXME
 113                         if host.from_host ~= from_host then
 114                                 log("error", "WARNING! This might, possibly, be a bug, but it might not...");
 115                                 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host));
 116                         end
 117                         if host.sends2s(stanza) then
 118                                 host.log("debug", "stanza sent over %s", host.type);
 119                                 return true;
 120                         end
 121                 end
 122         end
 123 end
 124
 125 -- Create a new outgoing session for a stanza
 126 function route_to_new_session(event)
 127         local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
 128         log("debug", "opening a new outgoing connection for this stanza");
 129         local host_session = s2s_new_outgoing(from_host, to_host);
 130
 131         -- Store in buffer
 132         host_session.bounce_sendq = bounce_sendq;
 133         host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
 134         log("debug", "stanza [%s] queued until connection complete", tostring(stanza.name));
 135         s2sout.initiate_connection(host_session);
 136         if (not host_session.connecting) and (not host_session.conn) then
 137                 log("warn", "Connection to %s failed already, destroying session...", to_host);
 138                 s2s_destroy_session(host_session, "Connection failed");
 139                 return false;
 140         end
 141         return true;
 142 end
 143
 144 local function keepalive(event)
 145         return event.session.sends2s(' ');
 146 end
 147
 148 module:hook("s2s-read-timeout", keepalive, -1);
 149
 150 function module.add_host(module)
 151         if module:get_option_boolean("disallow_s2s", false) then
 152                 module:log("warn", "The 'disallow_s2s' config option is deprecated, please see https://prosody.im/doc/s2s#disabling");
 153                 return nil, "This host has disallow_s2s set";
 154         end
 155         module:hook("route/remote", route_to_existing_session, -1);
 156         module:hook("route/remote", route_to_new_session, -10);
 157         module:hook("s2s-authenticated", make_authenticated, -1);
 158         module:hook("s2s-read-timeout", keepalive, -1);
 159         module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
 160                 if session.type == "s2sout" then
 161                         -- Stream is authenticated and we are seem to be done with feature negotiation,
 162                         -- so the stream is ready for stanzas.  RFC 6120 Section 4.3
 163                         mark_connected(session);
 164                         return true;
 165                 elseif not session.dialback_verifying then
 166                         session.log("warn", "No SASL EXTERNAL offer and Dialback doesn't seem to be enabled, giving up");
 167                         session:close();
 168                         return false;
 169                 end
 170         end, -1);
 171 end
 172
 173 -- Stream is authorised, and ready for normal stanzas
 174 function mark_connected(session)
 175         local sendq = session.sendq;
 176
 177         local from, to = session.from_host, session.to_host;
 178
 179         session.log("info", "%s s2s connection %s->%s complete", session.direction:gsub("^.", string.upper), from, to);
 180
 181         local event_data = { session = session };
 182         if session.type == "s2sout" then
 183                 fire_global_event("s2sout-established", event_data);
 184                 hosts[from].events.fire_event("s2sout-established", event_data);
 185         else
 186                 local host_session = hosts[to];
 187                 session.send = function(stanza)
 188                         return host_session.events.fire_event("route/remote", { from_host = to, to_host = from, stanza = stanza });
 189                 end;
 190
 191                 fire_global_event("s2sin-established", event_data);
 192                 hosts[to].events.fire_event("s2sin-established", event_data);
 193         end
 194
 195         if session.direction == "outgoing" then
 196                 if sendq then
 197                         session.log("debug", "sending %d queued stanzas across new outgoing connection to %s", #sendq, session.to_host);
 198                         local send = session.sends2s;
 199                         for i, data in ipairs(sendq) do
 200                                 send(data[1]);
 201                                 sendq[i] = nil;
 202                         end
 203                         session.sendq = nil;
 204                 end
 205
 206                 session.ip_hosts = nil;
 207                 session.srv_hosts = nil;
 208         end
 209 end
 210
 211 function make_authenticated(event)
 212         local session, host = event.session, event.host;
 213         if not session.secure then
 214                 if require_encryption or (secure_auth and not(insecure_domains[host])) or secure_domains[host] then
 215                         session:close({
 216                                 condition = "policy-violation",
 217                                 text = "Encrypted server-to-server communication is required but was not "
 218                                        ..((session.direction == "outgoing" and "offered") or "used")
 219                         });
 220                 end
 221         end
 222         if hosts[host] then
 223                 session:close({ condition = "undefined-condition", text = "Attempt to authenticate as a host we serve" });
 224         end
 225         if session.type == "s2sout_unauthed" then
 226                 session.type = "s2sout";
 227         elseif session.type == "s2sin_unauthed" then
 228                 session.type = "s2sin";
 229                 if host then
 230                         if not session.hosts[host] then session.hosts[host] = {}; end
 231                         session.hosts[host].authed = true;
 232                 end
 233         elseif session.type == "s2sin" and host then
 234                 if not session.hosts[host] then session.hosts[host] = {}; end
 235                 session.hosts[host].authed = true;
 236         else
 237                 return false;
 238         end
 239         session.log("debug", "connection %s->%s is now authenticated for %s", session.from_host, session.to_host, host);
 240
 241         if (session.type == "s2sout" and session.external_auth ~= "succeeded") or session.type == "s2sin" then
 242                 -- Stream either used dialback for authentication or is an incoming stream.
 243                 mark_connected(session);
 244         end
 245
 246         return true;
 247 end
 248
 249 --- Helper to check that a session peer's certificate is valid
 250 function check_cert_status(session)
 251         local host = session.direction == "outgoing" and session.to_host or session.from_host
 252         local conn = session.conn:socket()
 253         local cert
 254         if conn.getpeercertificate then
 255                 cert = conn:getpeercertificate()
 256         end
 257
 258         return module:fire_event("s2s-check-certificate", { host = host, session = session, cert = cert });
 259 end
 260
 261 --- XMPP stream event handlers
 262
 263 local stream_callbacks = { default_ns = "jabber:server" };
 264
 265 function stream_callbacks.handlestanza(session, stanza)
 266         stanza = session.filter("stanzas/in", stanza);
 267         session.thread:run(stanza);
 268 end
 269
 270 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
 271
 272 function stream_callbacks.streamopened(session, attr)
 273         -- run _streamopened in async context
 274         session.thread:run({ attr = attr });
 275 end
 276
 277 function stream_callbacks._streamopened(session, attr)
 278         session.version = tonumber(attr.version) or 0;
 279
 280         -- TODO: Rename session.secure to session.encrypted
 281         if session.secure == false then
 282                 session.secure = true;
 283                 session.encrypted = true;
 284
 285                 local sock = session.conn:socket();
 286                 if sock.info then
 287                         local info = sock:info();
 288                         (session.log or log)("info", "Stream encrypted (%s with %s)", info.protocol, info.cipher);
 289                         session.compressed = info.compression;
 290                 else
 291                         (session.log or log)("info", "Stream encrypted");
 292                         session.compressed = sock.compression and sock:compression(); --COMPAT mw/luasec-hg
 293                 end
 294         end
 295
 296         if session.direction == "incoming" then
 297                 -- Send a reply stream header
 298
 299                 -- Validate to/from
 300                 local to, from = nameprep(attr.to), nameprep(attr.from);
 301                 if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts)
 302                         session:close({ condition = "improper-addressing", text = "Invalid 'to' address" });
 303                         return;
 304                 end
 305                 if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts)
 306                         session:close({ condition = "improper-addressing", text = "Invalid 'from' address" });
 307                         return;
 308                 end
 309
 310                 -- Set session.[from/to]_host if they have not been set already and if
 311                 -- this session isn't already authenticated
 312                 if session.type == "s2sin_unauthed" and from and not session.from_host then
 313                         session.from_host = from;
 314                 elseif from ~= session.from_host then
 315                         session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" });
 316                         return;
 317                 end
 318                 if session.type == "s2sin_unauthed" and to and not session.to_host then
 319                         session.to_host = to;
 320                 elseif to ~= session.to_host then
 321                         session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" });
 322                         return;
 323                 end
 324
 325                 -- For convenience we'll put the sanitised values into these variables
 326                 to, from = session.to_host, session.from_host;
 327
 328                 session.streamid = uuid_gen();
 329                 (session.log or log)("debug", "Incoming s2s received %s", st.stanza("stream:stream", attr):top_tag());
 330                 if to then
 331                         if not hosts[to] then
 332                                 -- Attempting to connect to a host we don't serve
 333                                 session:close({
 334                                         condition = "host-unknown";
 335                                         text = "This host does not serve "..to
 336                                 });
 337                                 return;
 338                         elseif not hosts[to].modules.s2s then
 339                                 -- Attempting to connect to a host that disallows s2s
 340                                 session:close({
 341                                         condition = "policy-violation";
 342                                         text = "Server-to-server communication is disabled for this host";
 343                                 });
 344                                 return;
 345                         end
 346                 end
 347
 348                 if hosts[from] then
 349                         session:close({ condition = "undefined-condition", text = "Attempt to connect from a host we serve" });
 350                         return;
 351                 end
 352
 353                 if session.secure and not session.cert_chain_status then
 354                         if check_cert_status(session) == false then
 355                                 return;
 356                         end
 357                 end
 358
 359                 session:open_stream(session.to_host, session.from_host)
 360                 session.notopen = nil;
 361                 if session.version >= 1.0 then
 362                         local features = st.stanza("stream:features");
 363
 364                         if to then
 365                                 hosts[to].events.fire_event("s2s-stream-features", { origin = session, features = features });
 366                         else
 367                                 (session.log or log)("warn", "No 'to' on stream header from %s means we can't offer any features", from or session.ip or "unknown host");
 368                                 fire_global_event("s2s-stream-features-legacy", { origin = session, features = features });
 369                         end
 370
 371                         if ( session.type == "s2sin" or session.type == "s2sout" ) or features.tags[1] then
 372                                 log("debug", "Sending stream features: %s", tostring(features));
 373                                 session.sends2s(features);
 374                         else
 375                                 (session.log or log)("warn", "No features to offer, giving up");
 376                                 session:close({ condition = "undefined-condition", text = "No features to offer" });
 377                         end
 378                 end
 379         elseif session.direction == "outgoing" then
 380                 session.notopen = nil;
 381                 if not attr.id then
 382                         log("error", "Stream response from %s did not give us a stream id!", session.to_host);
 383                         session:close({ condition = "undefined-condition", text = "Missing stream ID" });
 384                         return;
 385                 end
 386                 session.streamid = attr.id;
 387
 388                 if session.secure and not session.cert_chain_status then
 389                         if check_cert_status(session) == false then
 390                                 return;
 391                         end
 392                 end
 393
 394                 -- Send unauthed buffer
 395                 -- (stanzas which are fine to send before dialback)
 396                 -- Note that this is *not* the stanza queue (which
 397                 -- we can only send if auth succeeds) :)
 398                 local send_buffer = session.send_buffer;
 399                 if send_buffer and #send_buffer > 0 then
 400                         log("debug", "Sending s2s send_buffer now...");
 401                         for i, data in ipairs(send_buffer) do
 402                                 session.sends2s(tostring(data));
 403                                 send_buffer[i] = nil;
 404                         end
 405                 end
 406                 session.send_buffer = nil;
 407
 408                 -- If server is pre-1.0, don't wait for features, just do dialback
 409                 if session.version < 1.0 then
 410                         if not session.dialback_verifying then
 411                                 hosts[session.from_host].events.fire_event("s2sout-authenticate-legacy", { origin = session });
 412                         else
 413                                 mark_connected(session);
 414                         end
 415                 end
 416         end
 417 end
 418
 419 function stream_callbacks.streamclosed(session)
 420         (session.log or log)("debug", "Received </stream:stream>");
 421         session:close(false);
 422 end
 423
 424 function stream_callbacks.error(session, error, data)
 425         if error == "no-stream" then
 426                 session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}")));
 427                 session:close("invalid-namespace");
 428         elseif error == "parse-error" then
 429                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
 430                 session:close("not-well-formed");
 431         elseif error == "stream-error" then
 432                 local condition, text = "undefined-condition";
 433                 for child in data:children() do
 434                         if child.attr.xmlns == xmlns_xmpp_streams then
 435                                 if child.name ~= "text" then
 436                                         condition = child.name;
 437                                 else
 438                                         text = child:get_text();
 439                                 end
 440                                 if condition ~= "undefined-condition" and text then
 441                                         break;
 442                                 end
 443                         end
 444                 end
 445                 text = condition .. (text and (" ("..text..")") or "");
 446                 session.log("info", "Session closed by remote with error: %s", text);
 447                 session:close(nil, text);
 448         end
 449 end
 450
 451 local listener = {};
 452
 453 --- Session methods
 454 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 455 local function session_close(session, reason, remote_reason)
 456         local log = session.log or log;
 457         if session.conn then
 458                 if session.notopen then
 459                         if session.direction == "incoming" then
 460                                 session:open_stream(session.to_host, session.from_host);
 461                         else
 462                                 session:open_stream(session.from_host, session.to_host);
 463                         end
 464                 end
 465                 if reason then -- nil == no err, initiated by us, false == initiated by remote
 466                         if type(reason) == "string" then -- assume stream error
 467                                 log("debug", "Disconnecting %s[%s], <stream:error> is: %s", session.host or session.ip or "(unknown host)", session.type, reason);
 468                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 469                         elseif type(reason) == "table" then
 470                                 if reason.condition then
 471                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 472                                         if reason.text then
 473                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 474                                         end
 475                                         if reason.extra then
 476                                                 stanza:add_child(reason.extra);
 477                                         end
 478                                         log("debug", "Disconnecting %s[%s], <stream:error> is: %s", session.host or session.ip or "(unknown host)", session.type, tostring(stanza));
 479                                         session.sends2s(stanza);
 480                                 elseif reason.name then -- a stanza
 481                                         log("debug", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));
 482                                         session.sends2s(reason);
 483                                 end
 484                         end
 485                 end
 486
 487                 session.sends2s("</stream:stream>");
 488                 function session.sends2s() return false; end
 489
 490                 local reason = remote_reason or (reason and (reason.text or reason.condition)) or reason;
 491                 session.log("info", "%s s2s stream %s->%s closed: %s", session.direction:gsub("^.", string.upper), session.from_host or "(unknown host)", session.to_host or "(unknown host)", reason or "stream closed");
 492
 493                 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
 494                 local conn = session.conn;
 495                 if reason == nil and not session.notopen and session.type == "s2sin" then
 496                         add_task(stream_close_timeout, function ()
 497                                 if not session.destroyed then
 498                                         session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
 499                                         s2s_destroy_session(session, reason);
 500                                         conn:close();
 501                                 end
 502                         end);
 503                 else
 504                         s2s_destroy_session(session, reason);
 505                         conn:close(); -- Close immediately, as this is an outgoing connection or is not authed
 506                 end
 507         end
 508 end
 509
 510 function session_stream_attrs(session, from, to, attr)
 511         if not from or (hosts[from] and hosts[from].modules.dialback) then
 512                 attr["xmlns:db"] = 'jabber:server:dialback';
 513         end
 514         if not from then
 515                 attr.from = '';
 516         end
 517         if not to then
 518                 attr.to = '';
 519         end
 520 end
 521
 522 -- Session initialization logic shared by incoming and outgoing
 523 local function initialize_session(session)
 524         local stream = new_xmpp_stream(session, stream_callbacks);
 525
 526         session.thread = runner(function (stanza)
 527                 if stanza.name == nil then
 528                         stream_callbacks._streamopened(session, stanza.attr);
 529                 else
 530                         core_process_stanza(session, stanza);
 531                 end
 532         end, runner_callbacks, session);
 533
 534         local log = session.log or log;
 535         session.stream = stream;
 536
 537         session.notopen = true;
 538
 539         function session.reset_stream()
 540                 session.notopen = true;
 541                 session.streamid = nil;
 542                 session.stream:reset();
 543         end
 544
 545         session.stream_attrs = session_stream_attrs;
 546
 547         local filter = initialize_filters(session);
 548         local conn = session.conn;
 549         local w = conn.write;
 550
 551         function session.sends2s(t)
 552                 log("debug", "sending: %s", t.top_tag and t:top_tag() or t:match("^[^>]*>?"));
 553                 if t.name then
 554                         t = filter("stanzas/out", t);
 555                 end
 556                 if t then
 557                         t = filter("bytes/out", tostring(t));
 558                         if t then
 559                                 return w(conn, t);
 560                         end
 561                 end
 562         end
 563
 564         function session.data(data)
 565                 data = filter("bytes/in", data);
 566                 if data then
 567                         local ok, err = stream:feed(data);
 568                         if ok then return; end
 569                         log("warn", "Received invalid XML: %s", data);
 570                         log("warn", "Problem was: %s", err);
 571                         session:close("not-well-formed");
 572                 end
 573         end
 574
 575         session.close = session_close;
 576
 577         local handlestanza = stream_callbacks.handlestanza;
 578         function session.dispatch_stanza(session, stanza)
 579                 return handlestanza(session, stanza);
 580         end
 581
 582         module:fire_event("s2s-created", { session = session });
 583
 584         add_task(connect_timeout, function ()
 585                 if session.type == "s2sin" or session.type == "s2sout" then
 586                         return; -- Ok, we're connected
 587                 elseif session.type == "s2s_destroyed" then
 588                         return; -- Session already destroyed
 589                 end
 590                 -- Not connected, need to close session and clean up
 591                 (session.log or log)("debug", "Destroying incomplete session %s->%s due to inactivity",
 592                 session.from_host or "(unknown)", session.to_host or "(unknown)");
 593                 session:close("connection-timeout");
 594         end);
 595 end
 596
 597 function runner_callbacks:ready()
 598         self.data.log("debug", "Runner %s ready (%s)", self.thread, coroutine.status(self.thread));
 599         self.data.conn:resume();
 600 end
 601
 602 function runner_callbacks:waiting()
 603         self.data.log("debug", "Runner %s waiting (%s)", self.thread, coroutine.status(self.thread));
 604         self.data.conn:pause();
 605 end
 606
 607 function runner_callbacks:error(err)
 608         (self.data.log or log)("error", "Traceback[s2s]: %s", err);
 609 end
 610
 611 function listener.onconnect(conn)
 612         measure_connections(1);
 613         conn:setoption("keepalive", opt_keepalives);
 614         local session = sessions[conn];
 615         if not session then -- New incoming connection
 616                 session = s2s_new_incoming(conn);
 617                 sessions[conn] = session;
 618                 session.log("debug", "Incoming s2s connection");
 619                 initialize_session(session);
 620         else -- Outgoing session connected
 621                 session:open_stream(session.from_host, session.to_host);
 622         end
 623         session.ip = conn:ip();
 624 end
 625
 626 function listener.onincoming(conn, data)
 627         local session = sessions[conn];
 628         if session then
 629                 session.data(data);
 630         end
 631 end
 632
 633 function listener.onstatus(conn, status)
 634         if status == "ssl-handshake-complete" then
 635                 local session = sessions[conn];
 636                 if session and session.direction == "outgoing" then
 637                         session.log("debug", "Sending stream header...");
 638                         session:open_stream(session.from_host, session.to_host);
 639                 end
 640         end
 641 end
 642
 643 function listener.ontimeout(conn)
 644         -- Called instead of onconnect when the connection times out
 645         measure_connections(1);
 646 end
 647
 648 function listener.ondisconnect(conn, err)
 649         measure_connections(-1);
 650         local session = sessions[conn];
 651         if session then
 652                 sessions[conn] = nil;
 653                 if err and session.direction == "outgoing" and session.notopen then
 654                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 655                         if s2sout.attempt_connection(session, err) then
 656                                 return; -- Session lives for now
 657                         end
 658                 end
 659                 (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "connection closed"));
 660                 s2s_destroy_session(session, err);
 661         end
 662 end
 663
 664 function listener.onreadtimeout(conn)
 665         local session = sessions[conn];
 666         local host = session.host or session.to_host;
 667         if session then
 668                 return (hosts[host] or prosody).events.fire_event("s2s-read-timeout", { session = session });
 669         end
 670 end
 671
 672 function listener.register_outgoing(conn, session)
 673         sessions[conn] = session;
 674         initialize_session(session);
 675 end
 676
 677 function listener.ondetach(conn)
 678         sessions[conn] = nil;
 679 end
 680
 681 function check_auth_policy(event)
 682         local host, session = event.host, event.session;
 683         local must_secure = secure_auth;
 684
 685         if not must_secure and secure_domains[host] then
 686                 must_secure = true;
 687         elseif must_secure and insecure_domains[host] then
 688                 must_secure = false;
 689         end
 690
 691         if must_secure and (session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid") then
 692                 module:log("warn", "Forbidding insecure connection to/from %s", host or session.ip or "(unknown host)");
 693                 if session.direction == "incoming" then
 694                         session:close({ condition = "not-authorized", text = "Your server's certificate is invalid, expired, or not trusted by "..session.to_host });
 695                 else -- Close outgoing connections without warning
 696                         session:close(false);
 697                 end
 698                 return false;
 699         end
 700 end
 701
 702 module:hook("s2s-check-certificate", check_auth_policy, -1);
 703
 704 s2sout.set_listener(listener);
 705
 706 module:hook("server-stopping", function(event)
 707         local reason = event.reason;
 708         for _, session in pairs(sessions) do
 709                 session:close{ condition = "system-shutdown", text = reason };
 710         end
 711 end, -200);
 712
 713
 714
 715 module:provides("net", {
 716         name = "s2s";
 717         listener = listener;
 718         default_port = 5269;
 719         encryption = "starttls";
 720         multiplex = {
 721                 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>";
 722         };
 723 });
 724