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