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 traceback = 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", "amount");
  42 local measure_ipv6 = module:measure("ipv6", "amount");
  43
  44 local sessions = module:shared("sessions");
  45
  46 local runner_callbacks = {};
  47
  48 local log = module._log;
  49
  50 module:hook("stats-update", function ()
  51         local count = 0;
  52         local ipv6 = 0;
  53         for _, session in pairs(sessions) do
  54                 count = count + 1;
  55                 if session.ip and session.ip:match(":") then
  56                         ipv6 = ipv6 + 1;
  57                 end
  58         end
  59         measure_connections(count);
  60         measure_ipv6(ipv6);
  61 end);
  62
  63 --- Handle stanzas to remote domains
  64
  65 local bouncy_stanzas = { message = true, presence = true, iq = true };
  66 local function bounce_sendq(session, reason)
  67         local sendq = session.sendq;
  68         if not sendq then return; end
  69         session.log("info", "Sending error replies for %d queued stanzas because of failed outgoing connection to %s", #sendq, session.to_host);
  70         local dummy = {
  71                 type = "s2sin";
  72                 send = function ()
  73                         (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
  74                 end;
  75                 dummy = true;
  76                 close = function ()
  77                         (session.log or log)("error", "Attempting to close the dummy origin of s2s error replies, please report this! Traceback: %s", traceback());
  78                 end;
  79         };
  80         for i, data in ipairs(sendq) do
  81                 local reply = data[2];
  82                 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
  83                         reply.attr.type = "error";
  84                         reply:tag("error", {type = "cancel", by = session.from_host})
  85                                 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
  86                         if reason then
  87                                 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
  88                                         :text("Server-to-server connection failed: "..reason):up();
  89                         end
  90                         core_process_stanza(dummy, reply);
  91                 end
  92                 sendq[i] = nil;
  93         end
  94         session.sendq = nil;
  95 end
  96
  97 -- Handles stanzas to existing s2s sessions
  98 function route_to_existing_session(event)
  99         local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
 100         if not hosts[from_host] then
 101                 log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host);
 102                 return false;
 103         end
 104         if hosts[to_host] then
 105                 log("warn", "Attempt to route stanza to a remote %s - a host we do serve?!", from_host);
 106                 return false;
 107         end
 108         local host = hosts[from_host].s2sout[to_host];
 109         if host then
 110                 -- We have a connection to this host already
 111                 if host.type == "s2sout_unauthed" and (stanza.name ~= "db:verify" or not host.dialback_key) then
 112                         (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
 113
 114                         -- Queue stanza until we are able to send it
 115                         local queued_item = {
 116                                 tostring(stanza),
 117                                 stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza);
 118                         };
 119                         if host.sendq then
 120                                 t_insert(host.sendq, queued_item);
 121                         else
 122                                 -- luacheck: ignore 122
 123                                 host.sendq = { queued_item };
 124                         end
 125                         host.log("debug", "stanza [%s] queued ", stanza.name);
 126                         return true;
 127                 elseif host.type == "local" or host.type == "component" then
 128                         log("error", "Trying to send a stanza to ourselves??")
 129                         log("error", "Traceback: %s", traceback());
 130                         log("error", "Stanza: %s", tostring(stanza));
 131                         return false;
 132                 else
 133                         -- FIXME
 134                         if host.from_host ~= from_host then
 135                                 log("error", "WARNING! This might, possibly, be a bug, but it might not...");
 136                                 log("error", "We are going to send from %s instead of %s", host.from_host, from_host);
 137                         end
 138                         if host.sends2s(stanza) then
 139                                 return true;
 140                         end
 141                 end
 142         end
 143 end
 144
 145 -- Create a new outgoing session for a stanza
 146 function route_to_new_session(event)
 147         local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
 148         log("debug", "opening a new outgoing connection for this stanza");
 149         local host_session = s2s_new_outgoing(from_host, to_host);
 150
 151         -- Store in buffer
 152         host_session.bounce_sendq = bounce_sendq;
 153         host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
 154         log("debug", "stanza [%s] queued until connection complete", tostring(stanza.name));
 155         s2sout.initiate_connection(host_session);
 156         if (not host_session.connecting) and (not host_session.conn) then
 157                 log("warn", "Connection to %s failed already, destroying session...", to_host);
 158                 s2s_destroy_session(host_session, "Connection failed");
 159                 return false;
 160         end
 161         return true;
 162 end
 163
 164 local function keepalive(event)
 165         return event.session.sends2s(' ');
 166 end
 167
 168 module:hook("s2s-read-timeout", keepalive, -1);
 169
 170 function module.add_host(module)
 171         if module:get_option_boolean("disallow_s2s", false) then
 172                 module:log("warn", "The 'disallow_s2s' config option is deprecated, please see https://prosody.im/doc/s2s#disabling");
 173                 return nil, "This host has disallow_s2s set";
 174         end
 175         module:hook("route/remote", route_to_existing_session, -1);
 176         module:hook("route/remote", route_to_new_session, -10);
 177         module:hook("s2s-authenticated", make_authenticated, -1);
 178         module:hook("s2s-read-timeout", keepalive, -1);
 179         module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) -- luacheck: ignore 212/stanza
 180                 if session.type == "s2sout" then
 181                         -- Stream is authenticated and we are seem to be done with feature negotiation,
 182                         -- so the stream is ready for stanzas.  RFC 6120 Section 4.3
 183                         mark_connected(session);
 184                         return true;
 185                 elseif not session.dialback_verifying then
 186                         session.log("warn", "No SASL EXTERNAL offer and Dialback doesn't seem to be enabled, giving up");
 187                         session:close();
 188                         return false;
 189                 end
 190         end, -1);
 191 end
 192
 193 -- Stream is authorised, and ready for normal stanzas
 194 function mark_connected(session)
 195
 196         local sendq = session.sendq;
 197
 198         local from, to = session.from_host, session.to_host;
 199
 200         session.log("info", "%s s2s connection %s->%s complete", session.direction:gsub("^.", string.upper), from, to);
 201
 202         local event_data = { session = session };
 203         if session.type == "s2sout" then
 204                 fire_global_event("s2sout-established", event_data);
 205                 hosts[from].events.fire_event("s2sout-established", event_data);
 206         else
 207                 local host_session = hosts[to];
 208                 session.send = function(stanza)
 209                         return host_session.events.fire_event("route/remote", { from_host = to, to_host = from, stanza = stanza });
 210                 end;
 211
 212                 fire_global_event("s2sin-established", event_data);
 213                 hosts[to].events.fire_event("s2sin-established", event_data);
 214         end
 215
 216         if session.direction == "outgoing" then
 217                 if sendq then
 218                         session.log("debug", "sending %d queued stanzas across new outgoing connection to %s", #sendq, session.to_host);
 219                         local send = session.sends2s;
 220                         for i, data in ipairs(sendq) do
 221                                 send(data[1]);
 222                                 sendq[i] = nil;
 223                         end
 224                         session.sendq = nil;
 225                 end
 226
 227                 if session.resolver then
 228                         session.resolver._resolver:closeall()
 229                 end
 230                 session.resolver = nil;
 231                 session.ip_hosts = nil;
 232                 session.srv_hosts = nil;
 233         end
 234 end
 235
 236 function make_authenticated(event)
 237         local session, host = event.session, event.host;
 238         if not session.secure then
 239                 if require_encryption or (secure_auth and not(insecure_domains[host])) or secure_domains[host] then
 240                         session:close({
 241                                 condition = "policy-violation",
 242                                 text = "Encrypted server-to-server communication is required but was not "
 243                                        ..((session.direction == "outgoing" and "offered") or "used")
 244                         });
 245                 end
 246         end
 247         if hosts[host] then
 248                 session:close({ condition = "undefined-condition", text = "Attempt to authenticate as a host we serve" });
 249         end
 250         if session.type == "s2sout_unauthed" then
 251                 session.type = "s2sout";
 252         elseif session.type == "s2sin_unauthed" then
 253                 session.type = "s2sin";
 254                 if host then
 255                         if not session.hosts[host] then session.hosts[host] = {}; end
 256                         session.hosts[host].authed = true;
 257                 end
 258         elseif session.type == "s2sin" and host then
 259                 if not session.hosts[host] then session.hosts[host] = {}; end
 260                 session.hosts[host].authed = true;
 261         else
 262                 return false;
 263         end
 264         session.log("debug", "connection %s->%s is now authenticated for %s", session.from_host, session.to_host, host);
 265
 266         if (session.type == "s2sout" and session.external_auth ~= "succeeded") or session.type == "s2sin" then
 267                 -- Stream either used dialback for authentication or is an incoming stream.
 268                 mark_connected(session);
 269         end
 270
 271         return true;
 272 end
 273
 274 --- Helper to check that a session peer's certificate is valid
 275 function check_cert_status(session)
 276         local host = session.direction == "outgoing" and session.to_host or session.from_host
 277         local conn = session.conn:socket()
 278         local cert
 279         if conn.getpeercertificate then
 280                 cert = conn:getpeercertificate()
 281         end
 282
 283         return module:fire_event("s2s-check-certificate", { host = host, session = session, cert = cert });
 284 end
 285
 286 --- XMPP stream event handlers
 287
 288 local stream_callbacks = { default_ns = "jabber:server" };
 289
 290 function stream_callbacks.handlestanza(session, stanza)
 291         stanza = session.filter("stanzas/in", stanza);
 292         session.thread:run(stanza);
 293 end
 294
 295 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
 296
 297 function stream_callbacks.streamopened(session, attr)
 298         -- run _streamopened in async context
 299         session.thread:run({ attr = attr });
 300 end
 301
 302 function stream_callbacks._streamopened(session, attr)
 303         session.version = tonumber(attr.version) or 0;
 304
 305         -- TODO: Rename session.secure to session.encrypted
 306         if session.secure == false then
 307                 session.secure = true;
 308                 session.encrypted = true;
 309
 310                 local sock = session.conn:socket();
 311                 if sock.info then
 312                         local info = sock:info();
 313                         (session.log or log)("info", "Stream encrypted (%s with %s)", info.protocol, info.cipher);
 314                         session.compressed = info.compression;
 315                 else
 316                         (session.log or log)("info", "Stream encrypted");
 317                         session.compressed = sock.compression and sock:compression(); --COMPAT mw/luasec-hg
 318                 end
 319         end
 320
 321         if session.direction == "incoming" then
 322                 -- Send a reply stream header
 323
 324                 -- Validate to/from
 325                 local to, from = nameprep(attr.to), nameprep(attr.from);
 326                 if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts)
 327                         session:close({ condition = "improper-addressing", text = "Invalid 'to' address" });
 328                         return;
 329                 end
 330                 if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts)
 331                         session:close({ condition = "improper-addressing", text = "Invalid 'from' address" });
 332                         return;
 333                 end
 334
 335                 -- Set session.[from/to]_host if they have not been set already and if
 336                 -- this session isn't already authenticated
 337                 if session.type == "s2sin_unauthed" and from and not session.from_host then
 338                         session.from_host = from;
 339                 elseif from ~= session.from_host then
 340                         session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" });
 341                         return;
 342                 end
 343                 if session.type == "s2sin_unauthed" and to and not session.to_host then
 344                         session.to_host = to;
 345                 elseif to ~= session.to_host then
 346                         session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" });
 347                         return;
 348                 end
 349
 350                 -- For convenience we'll put the sanitised values into these variables
 351                 to, from = session.to_host, session.from_host;
 352
 353                 session.streamid = uuid_gen();
 354                 (session.log or log)("debug", "Incoming s2s received %s", st.stanza("stream:stream", attr):top_tag());
 355                 if to then
 356                         if not hosts[to] then
 357                                 -- Attempting to connect to a host we don't serve
 358                                 session:close({
 359                                         condition = "host-unknown";
 360                                         text = "This host does not serve "..to
 361                                 });
 362                                 return;
 363                         elseif not hosts[to].modules.s2s then
 364                                 -- Attempting to connect to a host that disallows s2s
 365                                 session:close({
 366                                         condition = "policy-violation";
 367                                         text = "Server-to-server communication is disabled for this host";
 368                                 });
 369                                 return;
 370                         end
 371                 end
 372
 373                 if hosts[from] then
 374                         session:close({ condition = "undefined-condition", text = "Attempt to connect from a host we serve" });
 375                         return;
 376                 end
 377
 378                 if session.secure and not session.cert_chain_status then
 379                         if check_cert_status(session) == false then
 380                                 return;
 381                         end
 382                 end
 383
 384                 session:open_stream(session.to_host, session.from_host)
 385                 session.notopen = nil;
 386                 if session.version >= 1.0 then
 387                         local features = st.stanza("stream:features");
 388
 389                         if to then
 390                                 hosts[to].events.fire_event("s2s-stream-features", { origin = session, features = features });
 391                         else
 392                                 (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");
 393                                 fire_global_event("s2s-stream-features-legacy", { origin = session, features = features });
 394                         end
 395
 396                         if ( session.type == "s2sin" or session.type == "s2sout" ) or features.tags[1] then
 397                                 log("debug", "Sending stream features: %s", features);
 398                                 session.sends2s(features);
 399                         else
 400                                 (session.log or log)("warn", "No stream features to offer, giving up");
 401                                 session:close({ condition = "undefined-condition", text = "No stream features to offer" });
 402                         end
 403                 end
 404         elseif session.direction == "outgoing" then
 405                 session.notopen = nil;
 406                 if not attr.id then
 407                         log("warn", "Stream response did not give us a stream id!");
 408                         session:close({ condition = "undefined-condition", text = "Missing stream ID" });
 409                         return;
 410                 end
 411                 session.streamid = attr.id;
 412
 413                 if session.secure and not session.cert_chain_status then
 414                         if check_cert_status(session) == false then
 415                                 return;
 416                         end
 417                 end
 418
 419                 -- Send unauthed buffer
 420                 -- (stanzas which are fine to send before dialback)
 421                 -- Note that this is *not* the stanza queue (which
 422                 -- we can only send if auth succeeds) :)
 423                 local send_buffer = session.send_buffer;
 424                 if send_buffer and #send_buffer > 0 then
 425                         log("debug", "Sending s2s send_buffer now...");
 426                         for i, data in ipairs(send_buffer) do
 427                                 session.sends2s(tostring(data));
 428                                 send_buffer[i] = nil;
 429                         end
 430                 end
 431                 session.send_buffer = nil;
 432
 433                 -- If server is pre-1.0, don't wait for features, just do dialback
 434                 if session.version < 1.0 then
 435                         if not session.dialback_verifying then
 436                                 hosts[session.from_host].events.fire_event("s2sout-authenticate-legacy", { origin = session });
 437                         else
 438                                 mark_connected(session);
 439                         end
 440                 end
 441         end
 442 end
 443
 444 function stream_callbacks.streamclosed(session)
 445         (session.log or log)("debug", "Received </stream:stream>");
 446         session:close(false);
 447 end
 448
 449 function stream_callbacks.error(session, error, data)
 450         if error == "no-stream" then
 451                 session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}")));
 452                 session:close("invalid-namespace");
 453         elseif error == "parse-error" then
 454                 session.log("debug", "Server-to-server XML parse error: %s", error);
 455                 session:close("not-well-formed");
 456         elseif error == "stream-error" then
 457                 local condition, text = "undefined-condition";
 458                 for child in data:childtags(nil, xmlns_xmpp_streams) do
 459                         if child.name ~= "text" then
 460                                 condition = child.name;
 461                         else
 462                                 text = child:get_text();
 463                         end
 464                         if condition ~= "undefined-condition" and text then
 465                                 break;
 466                         end
 467                 end
 468                 text = condition .. (text and (" ("..text..")") or "");
 469                 session.log("info", "Session closed by remote with error: %s", text);
 470                 session:close(nil, text);
 471         end
 472 end
 473
 474 local listener = {};
 475
 476 --- Session methods
 477 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 478 local function session_close(session, reason, remote_reason)
 479         local log = session.log or log;
 480         if session.conn then
 481                 if session.notopen then
 482                         if session.direction == "incoming" then
 483                                 session:open_stream(session.to_host, session.from_host);
 484                         else
 485                                 session:open_stream(session.from_host, session.to_host);
 486                         end
 487                 end
 488                 if reason then -- nil == no err, initiated by us, false == initiated by remote
 489                         if type(reason) == "string" then -- assume stream error
 490                                 log("debug", "Disconnecting %s[%s], <stream:error> is: %s", session.host or session.ip or "(unknown host)", session.type, reason);
 491                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 492                         elseif type(reason) == "table" then
 493                                 if reason.condition then
 494                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 495                                         if reason.text then
 496                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 497                                         end
 498                                         if reason.extra then
 499                                                 stanza:add_child(reason.extra);
 500                                         end
 501                                         log("debug", "Disconnecting %s[%s], <stream:error> is: %s",
 502                                         session.host or session.ip or "(unknown host)", session.type, stanza);
 503                                         session.sends2s(stanza);
 504                                 elseif reason.name then -- a stanza
 505                                         log("debug", "Disconnecting %s->%s[%s], <stream:error> is: %s",
 506                                                 session.from_host or "(unknown host)", session.to_host or "(unknown host)",
 507                                                 session.type, reason);
 508                                         session.sends2s(reason);
 509                                 end
 510                         end
 511                 end
 512
 513                 session.sends2s("</stream:stream>");
 514                 function session.sends2s() return false; end
 515
 516                 -- luacheck: ignore 422/reason
 517                 -- FIXME reason should be managed in a place common to c2s, s2s, bosh, component etc
 518                 local reason = remote_reason or (reason and (reason.text or reason.condition)) or reason;
 519                 session.log("info", "%s s2s stream %s->%s closed: %s", session.direction:gsub("^.", string.upper),
 520                         session.from_host or "(unknown host)", session.to_host or "(unknown host)", reason or "stream closed");
 521
 522                 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
 523                 local conn = session.conn;
 524                 if reason == nil and not session.notopen and session.type == "s2sin" then
 525                         add_task(stream_close_timeout, function ()
 526                                 if not session.destroyed then
 527                                         session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
 528                                         s2s_destroy_session(session, reason);
 529                                         conn:close();
 530                                 end
 531                         end);
 532                 else
 533                         s2s_destroy_session(session, reason);
 534                         conn:close(); -- Close immediately, as this is an outgoing connection or is not authed
 535                 end
 536         end
 537 end
 538
 539 function session_stream_attrs(session, from, to, attr) -- luacheck: ignore 212/session
 540         if not from or (hosts[from] and hosts[from].modules.dialback) then
 541                 attr["xmlns:db"] = 'jabber:server:dialback';
 542         end
 543         if not from then
 544                 attr.from = '';
 545         end
 546         if not to then
 547                 attr.to = '';
 548         end
 549 end
 550
 551 -- Session initialization logic shared by incoming and outgoing
 552 local function initialize_session(session)
 553         local stream = new_xmpp_stream(session, stream_callbacks);
 554
 555         session.thread = runner(function (stanza)
 556                 if stanza.name == nil then
 557                         stream_callbacks._streamopened(session, stanza.attr);
 558                 else
 559                         core_process_stanza(session, stanza);
 560                 end
 561         end, runner_callbacks, session);
 562
 563         local log = session.log or log;
 564         session.stream = stream;
 565
 566         session.notopen = true;
 567
 568         function session.reset_stream()
 569                 session.notopen = true;
 570                 session.streamid = nil;
 571                 session.stream:reset();
 572         end
 573
 574         session.stream_attrs = session_stream_attrs;
 575
 576         local filter = initialize_filters(session);
 577         local conn = session.conn;
 578         local w = conn.write;
 579
 580         function session.sends2s(t)
 581                 log("debug", "Sending[%s]: %s", session.type, t.top_tag and t:top_tag() or t:match("^[^>]*>?"));
 582                 if t.name then
 583                         t = filter("stanzas/out", t);
 584                 end
 585                 if t then
 586                         t = filter("bytes/out", tostring(t));
 587                         if t then
 588                                 return w(conn, t);
 589                         end
 590                 end
 591         end
 592
 593         function session.data(data)
 594                 data = filter("bytes/in", data);
 595                 if data then
 596                         local ok, err = stream:feed(data);
 597                         if ok then return; end
 598                         log("warn", "Received invalid XML: %s", data);
 599                         log("warn", "Problem was: %s", err);
 600                         session:close("not-well-formed");
 601                 end
 602         end
 603
 604         session.close = session_close;
 605
 606         local handlestanza = stream_callbacks.handlestanza;
 607         function session.dispatch_stanza(session, stanza) -- luacheck: ignore 432/session
 608                 return handlestanza(session, stanza);
 609         end
 610
 611         module:fire_event("s2s-created", { session = session });
 612
 613         add_task(connect_timeout, function ()
 614                 if session.type == "s2sin" or session.type == "s2sout" then
 615                         return; -- Ok, we're connected
 616                 elseif session.type == "s2s_destroyed" then
 617                         return; -- Session already destroyed
 618                 end
 619                 -- Not connected, need to close session and clean up
 620                 (session.log or log)("debug", "Destroying incomplete session %s->%s due to inactivity",
 621                 session.from_host or "(unknown)", session.to_host or "(unknown)");
 622                 session:close("connection-timeout");
 623         end);
 624 end
 625
 626 function runner_callbacks:ready()
 627         self.data.log("debug", "Runner %s ready (%s)", self.thread, coroutine.status(self.thread));
 628         self.data.conn:resume();
 629 end
 630
 631 function runner_callbacks:waiting()
 632         self.data.log("debug", "Runner %s waiting (%s)", self.thread, coroutine.status(self.thread));
 633         self.data.conn:pause();
 634 end
 635
 636 function runner_callbacks:error(err)
 637         (self.data.log or log)("error", "Traceback[s2s]: %s", err);
 638 end
 639
 640 function listener.onconnect(conn)
 641         conn:setoption("keepalive", opt_keepalives);
 642         local session = sessions[conn];
 643         if not session then -- New incoming connection
 644                 session = s2s_new_incoming(conn);
 645                 sessions[conn] = session;
 646                 session.log("debug", "Incoming s2s connection");
 647                 initialize_session(session);
 648         else -- Outgoing session connected
 649                 session:open_stream(session.from_host, session.to_host);
 650         end
 651         session.ip = conn:ip();
 652 end
 653
 654 function listener.onincoming(conn, data)
 655         local session = sessions[conn];
 656         if session then
 657                 session.data(data);
 658         end
 659 end
 660
 661 function listener.onstatus(conn, status)
 662         if status == "ssl-handshake-complete" then
 663                 local session = sessions[conn];
 664                 if session and session.direction == "outgoing" then
 665                         session.log("debug", "Sending stream header...");
 666                         session:open_stream(session.from_host, session.to_host);
 667                 end
 668         end
 669 end
 670
 671 function listener.ondisconnect(conn, err)
 672         local session = sessions[conn];
 673         if session then
 674                 sessions[conn] = nil;
 675                 if err and session.direction == "outgoing" and session.notopen then
 676                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 677                         if s2sout.attempt_connection(session, err) then
 678                                 return; -- Session lives for now
 679                         end
 680                 end
 681                 (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed");
 682                 s2s_destroy_session(session, err);
 683         end
 684 end
 685
 686 function listener.onreadtimeout(conn)
 687         local session = sessions[conn];
 688         if session then
 689                 local host = session.host or session.to_host;
 690                 return (hosts[host] or prosody).events.fire_event("s2s-read-timeout", { session = session });
 691         end
 692 end
 693
 694 function listener.register_outgoing(conn, session)
 695         sessions[conn] = session;
 696         initialize_session(session);
 697 end
 698
 699 function listener.ondetach(conn)
 700         sessions[conn] = nil;
 701 end
 702
 703 function check_auth_policy(event)
 704         local host, session = event.host, event.session;
 705         local must_secure = secure_auth;
 706
 707         if not must_secure and secure_domains[host] then
 708                 must_secure = true;
 709         elseif must_secure and insecure_domains[host] then
 710                 must_secure = false;
 711         end
 712
 713         if must_secure and (session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid") then
 714                 module:log("warn", "Forbidding insecure connection to/from %s", host or session.ip or "(unknown host)");
 715                 if session.direction == "incoming" then
 716                         session:close({ condition = "not-authorized", text = "Your server's certificate is invalid, expired, or not trusted by "..session.to_host });
 717                 else -- Close outgoing connections without warning
 718                         session:close(false);
 719                 end
 720                 return false;
 721         end
 722 end
 723
 724 module:hook("s2s-check-certificate", check_auth_policy, -1);
 725
 726 s2sout.set_listener(listener);
 727
 728 module:hook("server-stopping", function(event)
 729         local reason = event.reason;
 730         for _, session in pairs(sessions) do
 731                 session:close{ condition = "system-shutdown", text = reason };
 732         end
 733 end, -200);
 734
 735
 736
 737 module:provides("net", {
 738         name = "s2s";
 739         listener = listener;
 740         default_port = 5269;
 741         encryption = "starttls";
 742         multiplex = {
 743                 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>";
 744         };
 745 });
 746