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 local connect = require "net.connect".connect;
  31 local service = require "net.resolvers.service";
  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 listener = {};
  49
  50 local log = module._log;
  51
  52 module:hook("stats-update", function ()
  53         local count = 0;
  54         local ipv6 = 0;
  55         for _, session in pairs(sessions) do
  56                 count = count + 1;
  57                 if session.ip and session.ip:match(":") then
  58                         ipv6 = ipv6 + 1;
  59                 end
  60         end
  61         measure_connections(count);
  62         measure_ipv6(ipv6);
  63 end);
  64
  65 --- Handle stanzas to remote domains
  66
  67 local bouncy_stanzas = { message = true, presence = true, iq = true };
  68 local function bounce_sendq(session, reason)
  69         local sendq = session.sendq;
  70         if not sendq then return; end
  71         session.log("info", "Sending error replies for %d queued stanzas because of failed outgoing connection to %s", #sendq, session.to_host);
  72         local dummy = {
  73                 type = "s2sin";
  74                 send = function ()
  75                         (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
  76                 end;
  77                 dummy = true;
  78                 close = function ()
  79                         (session.log or log)("error", "Attempting to close the dummy origin of s2s error replies, please report this! Traceback: %s", traceback());
  80                 end;
  81         };
  82         -- FIXME Allow for more specific error conditions
  83         -- TODO use util.error ?
  84         local error_type = "cancel";
  85         local condition = "remote-server-not-found";
  86         if session.had_stream then -- set when a stream is opened by the remote
  87                 error_type, condition = "wait", "remote-server-timeout";
  88         end
  89         for i, data in ipairs(sendq) do
  90                 local reply = data[2];
  91                 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
  92                         reply.attr.type = "error";
  93                         reply:tag("error", {type = error_type, by = session.from_host})
  94                                 :tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
  95                         if reason then
  96                                 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
  97                                         :text("Server-to-server connection failed: "..reason):up();
  98                         end
  99                         core_process_stanza(dummy, reply);
 100                 end
 101                 sendq[i] = nil;
 102         end
 103         session.sendq = nil;
 104 end
 105
 106 -- Handles stanzas to existing s2s sessions
 107 function route_to_existing_session(event)
 108         local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
 109         if not hosts[from_host] then
 110                 log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host);
 111                 return false;
 112         end
 113         if hosts[to_host] then
 114                 log("warn", "Attempt to route stanza to a remote %s - a host we do serve?!", from_host);
 115                 return false;
 116         end
 117         local host = hosts[from_host].s2sout[to_host];
 118         if host then
 119                 -- We have a connection to this host already
 120                 if host.type == "s2sout_unauthed" and (stanza.name ~= "db:verify" or not host.dialback_key) then
 121                         (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
 122
 123                         -- Queue stanza until we are able to send it
 124                         local queued_item = {
 125                                 tostring(stanza),
 126                                 stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza);
 127                         };
 128                         if host.sendq then
 129                                 t_insert(host.sendq, queued_item);
 130                         else
 131                                 -- luacheck: ignore 122
 132                                 host.sendq = { queued_item };
 133                         end
 134                         host.log("debug", "stanza [%s] queued ", stanza.name);
 135                         return true;
 136                 elseif host.type == "local" or host.type == "component" then
 137                         log("error", "Trying to send a stanza to ourselves??")
 138                         log("error", "Traceback: %s", traceback());
 139                         log("error", "Stanza: %s", stanza);
 140                         return false;
 141                 else
 142                         -- FIXME
 143                         if host.from_host ~= from_host then
 144                                 log("error", "WARNING! This might, possibly, be a bug, but it might not...");
 145                                 log("error", "We are going to send from %s instead of %s", host.from_host, from_host);
 146                         end
 147                         if host.sends2s(stanza) then
 148                                 return true;
 149                         end
 150                 end
 151         end
 152 end
 153
 154 -- Create a new outgoing session for a stanza
 155 function route_to_new_session(event)
 156         local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
 157         log("debug", "opening a new outgoing connection for this stanza");
 158         local host_session = s2s_new_outgoing(from_host, to_host);
 159         host_session.version = 1;
 160
 161         -- Store in buffer
 162         host_session.bounce_sendq = bounce_sendq;
 163         host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
 164         log("debug", "stanza [%s] queued until connection complete", stanza.name);
 165         connect(service.new(to_host, "xmpp-server", "tcp", { default_port = 5269 }), listener, nil, { session = host_session });
 166         return true;
 167 end
 168
 169 local function keepalive(event)
 170         return event.session.sends2s(' ');
 171 end
 172
 173 module:hook("s2s-read-timeout", keepalive, -1);
 174
 175 function module.add_host(module)
 176         if module:get_option_boolean("disallow_s2s", false) then
 177                 module:log("warn", "The 'disallow_s2s' config option is deprecated, please see https://prosody.im/doc/s2s#disabling");
 178                 return nil, "This host has disallow_s2s set";
 179         end
 180         module:hook("route/remote", route_to_existing_session, -1);
 181         module:hook("route/remote", route_to_new_session, -10);
 182         module:hook("s2s-authenticated", make_authenticated, -1);
 183         module:hook("s2s-read-timeout", keepalive, -1);
 184         module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) -- luacheck: ignore 212/stanza
 185                 if session.type == "s2sout" then
 186                         -- Stream is authenticated and we are seem to be done with feature negotiation,
 187                         -- so the stream is ready for stanzas.  RFC 6120 Section 4.3
 188                         mark_connected(session);
 189                         return true;
 190                 elseif not session.dialback_verifying then
 191                         session.log("warn", "No SASL EXTERNAL offer and Dialback doesn't seem to be enabled, giving up");
 192                         session:close();
 193                         return false;
 194                 end
 195         end, -1);
 196 end
 197
 198 -- Stream is authorised, and ready for normal stanzas
 199 function mark_connected(session)
 200
 201         local sendq = session.sendq;
 202
 203         local from, to = session.from_host, session.to_host;
 204
 205         session.log("info", "%s s2s connection %s->%s complete", session.direction:gsub("^.", string.upper), from, to);
 206
 207         local event_data = { session = session };
 208         if session.type == "s2sout" then
 209                 fire_global_event("s2sout-established", event_data);
 210                 hosts[from].events.fire_event("s2sout-established", event_data);
 211         else
 212                 local host_session = hosts[to];
 213                 session.send = function(stanza)
 214                         return host_session.events.fire_event("route/remote", { from_host = to, to_host = from, stanza = stanza });
 215                 end;
 216
 217                 fire_global_event("s2sin-established", event_data);
 218                 hosts[to].events.fire_event("s2sin-established", event_data);
 219         end
 220
 221         if session.direction == "outgoing" then
 222                 if sendq then
 223                         session.log("debug", "sending %d queued stanzas across new outgoing connection to %s", #sendq, session.to_host);
 224                         local send = session.sends2s;
 225                         for i, data in ipairs(sendq) do
 226                                 send(data[1]);
 227                                 sendq[i] = nil;
 228                         end
 229                         session.sendq = nil;
 230                 end
 231         end
 232 end
 233
 234 function make_authenticated(event)
 235         local session, host = event.session, event.host;
 236         if not session.secure then
 237                 if require_encryption or (secure_auth and not(insecure_domains[host])) or secure_domains[host] then
 238                         session:close({
 239                                 condition = "policy-violation",
 240                                 text = "Encrypted server-to-server communication is required but was not "
 241                                        ..((session.direction == "outgoing" and "offered") or "used")
 242                         });
 243                 end
 244         end
 245         if hosts[host] then
 246                 session:close({ condition = "undefined-condition", text = "Attempt to authenticate as a host we serve" });
 247         end
 248         if session.type == "s2sout_unauthed" then
 249                 session.type = "s2sout";
 250         elseif session.type == "s2sin_unauthed" then
 251                 session.type = "s2sin";
 252         elseif session.type ~= "s2sin" and session.type ~= "s2sout" then
 253                 return false;
 254         end
 255
 256         if session.incoming and host then
 257                 if not session.hosts[host] then session.hosts[host] = {}; end
 258                 session.hosts[host].authed = true;
 259         end
 260         session.log("debug", "connection %s->%s is now authenticated for %s", session.from_host, session.to_host, host);
 261
 262         if (session.type == "s2sout" and session.external_auth ~= "succeeded") or session.type == "s2sin" then
 263                 -- Stream either used dialback for authentication or is an incoming stream.
 264                 mark_connected(session);
 265         end
 266
 267         return true;
 268 end
 269
 270 --- Helper to check that a session peer's certificate is valid
 271 function check_cert_status(session)
 272         local host = session.direction == "outgoing" and session.to_host or session.from_host
 273         local conn = session.conn:socket()
 274         local cert
 275         if conn.getpeercertificate then
 276                 cert = conn:getpeercertificate()
 277         end
 278
 279         return module:fire_event("s2s-check-certificate", { host = host, session = session, cert = cert });
 280 end
 281
 282 --- XMPP stream event handlers
 283
 284 local stream_callbacks = { default_ns = "jabber:server" };
 285
 286 function stream_callbacks.handlestanza(session, stanza)
 287         stanza = session.filter("stanzas/in", stanza);
 288         session.thread:run(stanza);
 289 end
 290
 291 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
 292
 293 function stream_callbacks.streamopened(session, attr)
 294         -- run _streamopened in async context
 295         session.thread:run({ attr = attr });
 296 end
 297
 298 function stream_callbacks._streamopened(session, attr)
 299         session.version = tonumber(attr.version) or 0;
 300         session.had_stream = true; -- Had a stream opened at least once
 301
 302         -- TODO: Rename session.secure to session.encrypted
 303         if session.secure == false then
 304                 session.secure = true;
 305                 session.encrypted = true;
 306
 307                 local sock = session.conn:socket();
 308                 if sock.info then
 309                         local info = sock:info();
 310                         (session.log or log)("info", "Stream encrypted (%s with %s)", info.protocol, info.cipher);
 311                         session.compressed = info.compression;
 312                 else
 313                         (session.log or log)("info", "Stream encrypted");
 314                 end
 315         end
 316
 317         if session.direction == "incoming" then
 318                 -- Send a reply stream header
 319
 320                 -- Validate to/from
 321                 local to, from = nameprep(attr.to), nameprep(attr.from);
 322                 if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts)
 323                         session:close({ condition = "improper-addressing", text = "Invalid 'to' address" });
 324                         return;
 325                 end
 326                 if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts)
 327                         session:close({ condition = "improper-addressing", text = "Invalid 'from' address" });
 328                         return;
 329                 end
 330
 331                 -- Set session.[from/to]_host if they have not been set already and if
 332                 -- this session isn't already authenticated
 333                 if session.type == "s2sin_unauthed" and from and not session.from_host then
 334                         session.from_host = from;
 335                 elseif from ~= session.from_host then
 336                         session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" });
 337                         return;
 338                 end
 339                 if session.type == "s2sin_unauthed" and to and not session.to_host then
 340                         session.to_host = to;
 341                 elseif to ~= session.to_host then
 342                         session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" });
 343                         return;
 344                 end
 345
 346                 -- For convenience we'll put the sanitised values into these variables
 347                 to, from = session.to_host, session.from_host;
 348
 349                 session.streamid = uuid_gen();
 350                 (session.log or log)("debug", "Incoming s2s received %s", st.stanza("stream:stream", attr):top_tag());
 351                 if to then
 352                         if not hosts[to] then
 353                                 -- Attempting to connect to a host we don't serve
 354                                 session:close({
 355                                         condition = "host-unknown";
 356                                         text = "This host does not serve "..to
 357                                 });
 358                                 return;
 359                         elseif not hosts[to].modules.s2s then
 360                                 -- Attempting to connect to a host that disallows s2s
 361                                 session:close({
 362                                         condition = "policy-violation";
 363                                         text = "Server-to-server communication is disabled for this host";
 364                                 });
 365                                 return;
 366                         end
 367                 end
 368
 369                 if hosts[from] then
 370                         session:close({ condition = "undefined-condition", text = "Attempt to connect from a host we serve" });
 371                         return;
 372                 end
 373
 374                 if session.secure and not session.cert_chain_status then
 375                         if check_cert_status(session) == false then
 376                                 return;
 377                         end
 378                 end
 379
 380                 session:open_stream(session.to_host, session.from_host)
 381                 session.notopen = nil;
 382                 if session.version >= 1.0 then
 383                         local features = st.stanza("stream:features");
 384
 385                         if to then
 386                                 hosts[to].events.fire_event("s2s-stream-features", { origin = session, features = features });
 387                         else
 388                                 (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");
 389                                 fire_global_event("s2s-stream-features-legacy", { origin = session, features = features });
 390                         end
 391
 392                         if ( session.type == "s2sin" or session.type == "s2sout" ) or features.tags[1] then
 393                                 log("debug", "Sending stream features: %s", features);
 394                                 session.sends2s(features);
 395                         else
 396                                 (session.log or log)("warn", "No stream features to offer, giving up");
 397                                 session:close({ condition = "undefined-condition", text = "No stream features to offer" });
 398                         end
 399                 end
 400         elseif session.direction == "outgoing" then
 401                 session.notopen = nil;
 402                 if not attr.id then
 403                         log("warn", "Stream response did not give us a stream id!");
 404                         session:close({ condition = "undefined-condition", text = "Missing stream ID" });
 405                         return;
 406                 end
 407                 session.streamid = attr.id;
 408
 409                 if session.secure and not session.cert_chain_status then
 410                         if check_cert_status(session) == false then
 411                                 return;
 412                         end
 413                 end
 414
 415                 -- Send unauthed buffer
 416                 -- (stanzas which are fine to send before dialback)
 417                 -- Note that this is *not* the stanza queue (which
 418                 -- we can only send if auth succeeds) :)
 419                 local send_buffer = session.send_buffer;
 420                 if send_buffer and #send_buffer > 0 then
 421                         log("debug", "Sending s2s send_buffer now...");
 422                         for i, data in ipairs(send_buffer) do
 423                                 session.sends2s(tostring(data));
 424                                 send_buffer[i] = nil;
 425                         end
 426                 end
 427                 session.send_buffer = nil;
 428
 429                 -- If server is pre-1.0, don't wait for features, just do dialback
 430                 if session.version < 1.0 then
 431                         if not session.dialback_verifying then
 432                                 hosts[session.from_host].events.fire_event("s2sout-authenticate-legacy", { origin = session });
 433                         else
 434                                 mark_connected(session);
 435                         end
 436                 end
 437         end
 438 end
 439
 440 function stream_callbacks.streamclosed(session)
 441         (session.log or log)("debug", "Received </stream:stream>");
 442         session:close(false);
 443 end
 444
 445 function stream_callbacks.error(session, error, data)
 446         if error == "no-stream" then
 447                 session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}")));
 448                 session:close("invalid-namespace");
 449         elseif error == "parse-error" then
 450                 session.log("debug", "Server-to-server XML parse error: %s", error);
 451                 session:close("not-well-formed");
 452         elseif error == "stream-error" then
 453                 local condition, text = "undefined-condition";
 454                 for child in data:childtags(nil, xmlns_xmpp_streams) do
 455                         if child.name ~= "text" then
 456                                 condition = child.name;
 457                         else
 458                                 text = child:get_text();
 459                         end
 460                         if condition ~= "undefined-condition" and text then
 461                                 break;
 462                         end
 463                 end
 464                 text = condition .. (text and (" ("..text..")") or "");
 465                 session.log("info", "Session closed by remote with error: %s", text);
 466                 session:close(nil, text);
 467         end
 468 end
 469
 470 --- Session methods
 471 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 472 local function session_close(session, reason, remote_reason)
 473         local log = session.log or log;
 474         if session.conn then
 475                 if session.notopen then
 476                         if session.direction == "incoming" then
 477                                 session:open_stream(session.to_host, session.from_host);
 478                         else
 479                                 session:open_stream(session.from_host, session.to_host);
 480                         end
 481                 end
 482                 if reason then -- nil == no err, initiated by us, false == initiated by remote
 483                         if type(reason) == "string" then -- assume stream error
 484                                 log("debug", "Disconnecting %s[%s], <stream:error> is: %s", session.host or session.ip or "(unknown host)", session.type, reason);
 485                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 486                         elseif type(reason) == "table" then
 487                                 if reason.condition then
 488                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 489                                         if reason.text then
 490                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 491                                         end
 492                                         if reason.extra then
 493                                                 stanza:add_child(reason.extra);
 494                                         end
 495                                         log("debug", "Disconnecting %s[%s], <stream:error> is: %s",
 496                                         session.host or session.ip or "(unknown host)", session.type, stanza);
 497                                         session.sends2s(stanza);
 498                                 elseif reason.name then -- a stanza
 499                                         log("debug", "Disconnecting %s->%s[%s], <stream:error> is: %s",
 500                                                 session.from_host or "(unknown host)", session.to_host or "(unknown host)",
 501                                                 session.type, reason);
 502                                         session.sends2s(reason);
 503                                 end
 504                         end
 505                 end
 506
 507                 session.sends2s("</stream:stream>");
 508                 function session.sends2s() return false; end
 509
 510                 -- luacheck: ignore 422/reason
 511                 -- FIXME reason should be managed in a place common to c2s, s2s, bosh, component etc
 512                 local reason = remote_reason or (reason and (reason.text or reason.condition)) or reason;
 513                 session.log("info", "%s s2s stream %s->%s closed: %s", session.direction:gsub("^.", string.upper),
 514                         session.from_host or "(unknown host)", session.to_host or "(unknown host)", reason or "stream closed");
 515
 516                 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
 517                 local conn = session.conn;
 518                 if reason == nil and not session.notopen and session.type == "s2sin" then
 519                         add_task(stream_close_timeout, function ()
 520                                 if not session.destroyed then
 521                                         session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
 522                                         s2s_destroy_session(session, reason);
 523                                         conn:close();
 524                                 end
 525                         end);
 526                 else
 527                         s2s_destroy_session(session, reason);
 528                         conn:close(); -- Close immediately, as this is an outgoing connection or is not authed
 529                 end
 530         end
 531 end
 532
 533 function session_stream_attrs(session, from, to, attr) -- luacheck: ignore 212/session
 534         if not from or (hosts[from] and hosts[from].modules.dialback) then
 535                 attr["xmlns:db"] = 'jabber:server:dialback';
 536         end
 537         if not from then
 538                 attr.from = '';
 539         end
 540         if not to then
 541                 attr.to = '';
 542         end
 543 end
 544
 545 -- Session initialization logic shared by incoming and outgoing
 546 local function initialize_session(session)
 547         local stream = new_xmpp_stream(session, stream_callbacks);
 548
 549         session.thread = runner(function (stanza)
 550                 if stanza.name == nil then
 551                         stream_callbacks._streamopened(session, stanza.attr);
 552                 else
 553                         core_process_stanza(session, stanza);
 554                 end
 555         end, runner_callbacks, session);
 556
 557         local log = session.log or log;
 558         session.stream = stream;
 559
 560         session.notopen = true;
 561
 562         function session.reset_stream()
 563                 session.notopen = true;
 564                 session.streamid = nil;
 565                 session.stream:reset();
 566         end
 567
 568         session.stream_attrs = session_stream_attrs;
 569
 570         local filter = initialize_filters(session);
 571         local conn = session.conn;
 572         local w = conn.write;
 573
 574         function session.sends2s(t)
 575                 log("debug", "Sending[%s]: %s", session.type, t.top_tag and t:top_tag() or t:match("^[^>]*>?"));
 576                 if t.name then
 577                         t = filter("stanzas/out", t);
 578                 end
 579                 if t then
 580                         t = filter("bytes/out", tostring(t));
 581                         if t then
 582                                 return w(conn, t);
 583                         end
 584                 end
 585         end
 586
 587         function session.data(data)
 588                 data = filter("bytes/in", data);
 589                 if data then
 590                         local ok, err = stream:feed(data);
 591                         if ok then return; end
 592                         log("debug", "Received invalid XML (%s) %d bytes: %q", err, #data, data:sub(1, 300));
 593                         session:close("not-well-formed");
 594                 end
 595         end
 596
 597         session.close = session_close;
 598
 599         local handlestanza = stream_callbacks.handlestanza;
 600         function session.dispatch_stanza(session, stanza) -- luacheck: ignore 432/session
 601                 return handlestanza(session, stanza);
 602         end
 603
 604         module:fire_event("s2s-created", { session = session });
 605
 606         add_task(connect_timeout, function ()
 607                 if session.type == "s2sin" or session.type == "s2sout" then
 608                         return; -- Ok, we're connected
 609                 elseif session.type == "s2s_destroyed" then
 610                         return; -- Session already destroyed
 611                 end
 612                 -- Not connected, need to close session and clean up
 613                 (session.log or log)("debug", "Destroying incomplete session %s->%s due to inactivity",
 614                 session.from_host or "(unknown)", session.to_host or "(unknown)");
 615                 session:close("connection-timeout");
 616         end);
 617 end
 618
 619 function runner_callbacks:ready()
 620         self.data.log("debug", "Runner %s ready (%s)", self.thread, coroutine.status(self.thread));
 621         self.data.conn:resume();
 622 end
 623
 624 function runner_callbacks:waiting()
 625         self.data.log("debug", "Runner %s waiting (%s)", self.thread, coroutine.status(self.thread));
 626         self.data.conn:pause();
 627 end
 628
 629 function runner_callbacks:error(err)
 630         (self.data.log or log)("error", "Traceback[s2s]: %s", err);
 631 end
 632
 633 function listener.onconnect(conn)
 634         conn:setoption("keepalive", opt_keepalives);
 635         local session = sessions[conn];
 636         if not session then -- New incoming connection
 637                 session = s2s_new_incoming(conn);
 638                 sessions[conn] = session;
 639                 session.log("debug", "Incoming s2s connection");
 640                 initialize_session(session);
 641         else -- Outgoing session connected
 642                 session:open_stream(session.from_host, session.to_host);
 643         end
 644         session.ip = conn:ip();
 645 end
 646
 647 function listener.onincoming(conn, data)
 648         local session = sessions[conn];
 649         if session then
 650                 session.data(data);
 651         end
 652 end
 653
 654 function listener.onstatus(conn, status)
 655         if status == "ssl-handshake-complete" then
 656                 local session = sessions[conn];
 657                 if session and session.direction == "outgoing" then
 658                         session.log("debug", "Sending stream header...");
 659                         session:open_stream(session.from_host, session.to_host);
 660                 end
 661         end
 662 end
 663
 664 function listener.ondisconnect(conn, err)
 665         local session = sessions[conn];
 666         if session then
 667                 sessions[conn] = nil;
 668                 (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed");
 669                 s2s_destroy_session(session, err);
 670         end
 671 end
 672
 673 function listener.onfail(data, err)
 674         local session = data and data.session;
 675         if session then
 676                 if err and session.direction == "outgoing" and session.notopen then
 677                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 678                 end
 679                 (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed");
 680                 s2s_destroy_session(session, err);
 681         end
 682 end
 683
 684 function listener.onreadtimeout(conn)
 685         local session = sessions[conn];
 686         if session then
 687                 local host = session.host or session.to_host;
 688                 return (hosts[host] or prosody).events.fire_event("s2s-read-timeout", { session = session });
 689         end
 690 end
 691
 692 function listener.register_outgoing(conn, session)
 693         sessions[conn] = session;
 694         initialize_session(session);
 695 end
 696
 697 function listener.ondetach(conn)
 698         sessions[conn] = nil;
 699 end
 700
 701 function listener.onattach(conn, data)
 702         local session = data and data.session;
 703         if session then
 704                 session.conn = conn;
 705                 sessions[conn] = session;
 706                 initialize_session(session);
 707         end
 708 end
 709
 710 function check_auth_policy(event)
 711         local host, session = event.host, event.session;
 712         local must_secure = secure_auth;
 713
 714         if not must_secure and secure_domains[host] then
 715                 must_secure = true;
 716         elseif must_secure and insecure_domains[host] then
 717                 must_secure = false;
 718         end
 719
 720         if must_secure and (session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid") then
 721                 module:log("warn", "Forbidding insecure connection to/from %s", host or session.ip or "(unknown host)");
 722                 if session.direction == "incoming" then
 723                         session:close({ condition = "not-authorized", text = "Your server's certificate is invalid, expired, or not trusted by "..session.to_host });
 724                 else -- Close outgoing connections without warning
 725                         session:close(false);
 726                 end
 727                 return false;
 728         end
 729 end
 730
 731 module:hook("s2s-check-certificate", check_auth_policy, -1);
 732
 733 module:hook("server-stopping", function(event)
 734         local reason = event.reason;
 735         for _, session in pairs(sessions) do
 736                 session:close{ condition = "system-shutdown", text = reason };
 737         end
 738 end, -200);
 739
 740
 741
 742 module:provides("net", {
 743         name = "s2s";
 744         listener = listener;
 745         default_port = 5269;
 746         encryption = "starttls";
 747         ssl_config = { -- FIXME This is not used atm, see mod_tls
 748                 verify = { "peer", "client_once", };
 749         };
 750         multiplex = {
 751                 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>";
 752         };
 753 });
 754