biboumi_component.cpp 21.8 KB
Newer Older
1 2 3 4 5 6 7
#include <xmpp/biboumi_component.hpp>

#include <utils/timed_events.hpp>
#include <utils/scopeguard.hpp>
#include <utils/tolower.hpp>
#include <logger/logger.hpp>
#include <xmpp/adhoc_command.hpp>
8
#include <xmpp/biboumi_adhoc_commands.hpp>
9 10 11 12 13 14 15 16 17 18 19
#include <bridge/list_element.hpp>
#include <config/config.hpp>
#include <xmpp/jid.hpp>
#include <utils/sha1.hpp>

#include <stdexcept>
#include <iostream>

#include <stdio.h>

#include <louloulibs.h>
20
#include <biboumi.h>
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

#include <uuid.h>

#ifdef SYSTEMD_FOUND
# include <systemd/sd-daemon.h>
#endif

using namespace std::string_literals;

static std::set<std::string> kickable_errors{
    "gone",
    "internal-server-error",
    "item-not-found",
    "jid-malformed",
    "recipient-unavailable",
    "redirect",
    "remote-server-not-found",
    "remote-server-timeout",
    "service-unavailable",
    "malformed-error"
    };


BiboumiComponent::BiboumiComponent(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& secret):
45
  XmppComponent(poller, hostname, secret),
46 47
  irc_server_adhoc_commands_handler(*this),
  irc_channel_adhoc_commands_handler(*this)
48 49 50 51 52 53 54 55
{
  this->stanza_handlers.emplace("presence",
                                std::bind(&BiboumiComponent::handle_presence, this,std::placeholders::_1));
  this->stanza_handlers.emplace("message",
                                std::bind(&BiboumiComponent::handle_message, this,std::placeholders::_1));
  this->stanza_handlers.emplace("iq",
                                std::bind(&BiboumiComponent::handle_iq, this,std::placeholders::_1));

56
  this->adhoc_commands_handler.get_commands() = {
57 58
    {"ping", AdhocCommand({&PingStep1}, "Do a ping", false)},
    {"hello", AdhocCommand({&HelloStep1, &HelloStep2}, "Receive a custom greeting", false)},
59 60
    {"disconnect-user", AdhocCommand({&DisconnectUserStep1, &DisconnectUserStep2}, "Disconnect selected users from the gateway", true)},
    {"disconnect-from-irc-servers", AdhocCommand({&DisconnectUserFromServerStep1, &DisconnectUserFromServerStep2, &DisconnectUserFromServerStep3}, "Disconnect from the selected IRC servers", false)},
61 62
    {"reload", AdhocCommand({&Reload}, "Reload biboumi’s configuration", true)}
  };
63 64 65 66 67 68

  this->irc_server_adhoc_commands_handler.get_commands() = {
#ifdef USE_DATABASE
    {"configure", AdhocCommand({&ConfigureIrcServerStep1, &ConfigureIrcServerStep2}, "Configure a few settings for that IRC server", false)},
#endif
  };
69 70 71
  this->irc_channel_adhoc_commands_handler.get_commands() = {
    {"configure", AdhocCommand({&ConfigureIrcChannelStep1, &ConfigureIrcChannelStep2}, "Configure a few settings for that IRC channel", false)},
  };
72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131
}

void BiboumiComponent::shutdown()
{
  for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
  {
    it->second->shutdown("Gateway shutdown");
  }
}

void BiboumiComponent::clean()
{
  auto it = this->bridges.begin();
  while (it != this->bridges.end())
  {
    it->second->clean();
    if (it->second->active_clients() == 0)
      it = this->bridges.erase(it);
    else
      ++it;
  }
}

void BiboumiComponent::handle_presence(const Stanza& stanza)
{
  std::string from = stanza.get_tag("from");
  std::string id = stanza.get_tag("id");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  // Check for mandatory tags
  if (from.empty())
    {
      log_warning("Received an invalid presence stanza: tag 'from' is missing.");
      return;
    }
  if (to_str.empty())
    {
      this->send_stanza_error("presence", from, this->served_hostname, id,
                              "modify", "bad-request", "Missing 'to' tag");
      return;
    }

  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);
  Iid iid(to.local);

  // An error stanza is sent whenever we exit this function without
  // disabling this scopeguard.  If error_type and error_name are not
  // changed, the error signaled is internal-server-error. Change their
  // value to signal an other kind of error. For example
  // feature-not-implemented, etc.  Any non-error process should reach the
  // stanza_error.disable() call at the end of the function.
  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("presence", from, to_str, id,
                              error_type, error_name, "");
        });

132
  try {
133 134 135 136 137 138 139 140
  if (iid.is_channel && !iid.get_server().empty())
    { // presence toward a MUC that corresponds to an irc channel, or a
      // dummy channel if iid.chan is empty
      if (type.empty())
        {
          const std::string own_nick = bridge->get_own_nick(iid);
          if (!own_nick.empty() && own_nick != to.resource)
            bridge->send_irc_nick_change(iid, to.resource);
141 142
          const XmlNode* x = stanza.get_child("x", MUC_NS);
          const XmlNode* password = x ? x->get_child("password", MUC_NS): nullptr;
143 144 145 146 147
          bridge->join_irc_channel(iid, to.resource,
                                   password ? password->get_inner() : "");
        }
      else if (type == "unavailable")
        {
148
          const XmlNode* status = stanza.get_child("status", COMPONENT_NS);
louiz’'s avatar
louiz’ committed
149
          bridge->leave_irc_channel(std::move(iid), status ? status->get_inner() : "");
150 151 152 153 154 155 156 157
        }
    }
  else
    {
      // An user wants to join an invalid IRC channel, return a presence error to him
      if (type.empty())
        this->send_invalid_room_error(to.local, to.resource, from);
    }
158 159 160 161 162 163 164 165
  }
  catch (const IRCNotConnected& ex)
    {
      this->send_stanza_error("presence", from, to_str, id,
                              "cancel", "remote-server-not-found",
                              "Not connected to IRC server "s + ex.hostname,
                              true);
    }
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
  stanza_error.disable();
}

void BiboumiComponent::handle_message(const Stanza& stanza)
{
  std::string from = stanza.get_tag("from");
  std::string id = stanza.get_tag("id");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  if (from.empty())
    return;
  if (type.empty())
    type = "normal";
  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);
  Iid iid(to.local);

  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("message", from, to_str, id,
                              error_type, error_name, "");
    });
190
  const XmlNode* body = stanza.get_child("body", COMPONENT_NS);
191 192

  try {                         // catch IRCNotConnected exceptions
193 194 195 196 197 198
  if (type == "groupchat" && iid.is_channel)
    {
      if (body && !body->get_inner().empty())
        {
          bridge->send_channel_message(iid, body->get_inner());
        }
199
      const XmlNode* subject = stanza.get_child("subject", COMPONENT_NS);
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
      if (subject)
        bridge->set_channel_topic(iid, subject->get_inner());
    }
  else if (type == "error")
    {
      const XmlNode* error = stanza.get_child("error", COMPONENT_NS);
      // Only a set of errors are considered “fatal”. If we encounter one of
      // them, we purge (we disconnect the user from all the IRC servers).
      // We consider this to be true, unless the error condition is
      // specified and is not in the kickable_errors set
      bool kickable_error = true;
      if (error && error->has_children())
        {
          const XmlNode* condition = error->get_last_child();
          if (kickable_errors.find(condition->get_name()) == kickable_errors.end())
            kickable_error = false;
        }
      if (kickable_error)
        bridge->shutdown("Error from remote client");
    }
  else if (type == "chat")
    {
      if (body && !body->get_inner().empty())
        {
          // a message for nick!server
          if (iid.is_user && !iid.get_local().empty())
            {
              bridge->send_private_message(iid, body->get_inner());
              bridge->remove_preferred_from_jid(iid.get_local());
            }
          else if (!iid.is_user && !to.resource.empty())
            { // a message for chan%server@biboumi/Nick or
              // server@biboumi/Nick
              // Convert that into a message to nick!server
              Iid user_iid(utils::tolower(to.resource) + "!" + iid.get_server());
              bridge->send_private_message(user_iid, body->get_inner());
              bridge->set_preferred_from_jid(user_iid.get_local(), to_str);
            }
louiz’'s avatar
louiz’ committed
238 239 240 241 242
          else if (!iid.is_user && !iid.is_channel)
            { // Message sent to the server JID
              // Convert the message body into a raw IRC message
              bridge->send_raw_message(iid.get_server(), body->get_inner());
            }
243 244 245 246
        }
    }
  else if (iid.is_user)
    this->send_invalid_user_error(to.local, from);
247 248 249 250 251 252 253
  } catch (const IRCNotConnected& ex)
    {
      this->send_stanza_error("message", from, to_str, id,
                              "cancel", "remote-server-not-found",
                              "Not connected to IRC server "s + ex.hostname,
                              true);
    }
254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
  stanza_error.disable();
}

// We MUST return an iq, whatever happens, except if the type is
// "result".
// To do this, we use a scopeguard. If an exception is raised somewhere, an
// iq of type error "internal-server-error" is sent. If we handle the
// request properly (by calling a function that registers an iq to be sent
// later, or that directly sends an iq), we disable the ScopeGuard. If we
// reach the end of the function without having disabled the scopeguard, we
// send a "feature-not-implemented" iq as a result.  If an other kind of
// error is found (for example the feature is implemented in biboumi, but
// the request is missing some attribute) we can just change the values of
// error_type and error_name and return from the function (without disabling
// the scopeguard); an iq error will be sent
void BiboumiComponent::handle_iq(const Stanza& stanza)
{
  std::string id = stanza.get_tag("id");
  std::string from = stanza.get_tag("from");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  if (from.empty())
    return;
  if (id.empty() || to_str.empty() || type.empty())
    {
      this->send_stanza_error("iq", from, this->served_hostname, id,
                              "modify", "bad-request", "");
      return;
    }

  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);

  // These two values will be used in the error iq sent if we don't disable
  // the scopeguard.
  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("iq", from, to_str, id,
                              error_type, error_name, "");
    });
296
  try {
297 298
  if (type == "set")
    {
299
      const XmlNode* query;
300 301 302 303 304 305 306 307 308 309 310 311 312 313
      if ((query = stanza.get_child("query", MUC_ADMIN_NS)))
        {
          const XmlNode* child = query->get_child("item", MUC_ADMIN_NS);
          if (child)
            {
              std::string nick = child->get_tag("nick");
              std::string role = child->get_tag("role");
              std::string affiliation = child->get_tag("affiliation");
              if (!nick.empty())
                {
                  Iid iid(to.local);
                  if (role == "none")
                    {               // This is a kick
                      std::string reason;
314
                      const XmlNode* reason_el = child->get_child("reason", MUC_ADMIN_NS);
315 316 317 318 319 320 321 322 323 324 325 326 327 328
                      if (reason_el)
                        reason = reason_el->get_inner();
                      bridge->send_irc_kick(iid, nick, reason, id, from);
                    }
                  else
                    bridge->forward_affiliation_role_change(iid, nick, affiliation, role);
                  stanza_error.disable();
                }
            }
        }
      else if ((query = stanza.get_child("command", ADHOC_NS)))
        {
          Stanza response("iq");
          response["to"] = from;
329
          response["from"] = to_str;
330
          response["id"] = id;
331 332 333 334 335 336 337

          // Depending on the 'to' jid in the request, we use one adhoc
          // command handler or an other
          Iid iid(to.local);
          AdhocCommandsHandler* adhoc_handler;
          if (!to.local.empty() && !iid.is_user && !iid.is_channel)
            adhoc_handler = &this->irc_server_adhoc_commands_handler;
338 339
          else if (!to.local.empty() && iid.is_channel)
            adhoc_handler = &this->irc_channel_adhoc_commands_handler;
340 341 342 343 344 345
          else
            adhoc_handler = &this->adhoc_commands_handler;

          // Execute the command, if any, and get a result XmlNode that we
          // insert in our response
          XmlNode inner_node = adhoc_handler->handle_request(from, to_str, *query);
346 347 348 349 350 351 352 353 354 355 356
          if (inner_node.get_child("error", ADHOC_NS))
            response["type"] = "error";
          else
            response["type"] = "result";
          response.add_child(std::move(inner_node));
          this->send_stanza(response);
          stanza_error.disable();
        }
    }
  else if (type == "get")
    {
357
      const XmlNode* query;
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398
      if ((query = stanza.get_child("query", DISCO_INFO_NS)))
        { // Disco info
          if (to_str == this->served_hostname)
            {
              const std::string node = query->get_tag("node");
              if (node.empty())
                {
                  // On the gateway itself
                  this->send_self_disco_info(id, from);
                  stanza_error.disable();
                }
            }
        }
      else if ((query = stanza.get_child("query", VERSION_NS)))
        {
          Iid iid(to.local);
          if (iid.is_user ||
              (iid.is_channel && !to.resource.empty()))
            {
              // Get the IRC user version
              std::string target;
              if (iid.is_user)
                target = iid.get_local();
              else
                target = to.resource;
              bridge->send_irc_version_request(iid.get_server(), target, id,
                                               from, to_str);
            }
          else
            {
              // On the gateway itself or on a channel
              this->send_version(id, from, to_str);
            }
          stanza_error.disable();
        }
      else if ((query = stanza.get_child("query", DISCO_ITEMS_NS)))
        {
          Iid iid(to.local);
          const std::string node = query->get_tag("node");
          if (node == ADHOC_NS)
            {
399
              Jid from_jid(from);
400 401 402 403
              if (to.local.empty())
                {               // Get biboumi's adhoc commands
                  this->send_adhoc_commands_list(id, from, this->served_hostname,
                                                 (Config::get("admin", "") ==
404
                                                  from_jid.bare()),
405 406 407 408 409 410 411
                                                 this->adhoc_commands_handler);
                  stanza_error.disable();
                }
              else if (!iid.is_user && !iid.is_channel)
                {               // Get the server's adhoc commands
                  this->send_adhoc_commands_list(id, from, to_str,
                                                 (Config::get("admin", "") ==
412
                                                  from_jid.bare()),
413 414 415
                                                 this->irc_server_adhoc_commands_handler);
                  stanza_error.disable();
                }
416 417 418 419 420 421 422 423
              else if (!iid.is_user && iid.is_channel)
                {               // Get the channel's adhoc commands
                  this->send_adhoc_commands_list(id, from, to_str,
                                                 (Config::get("admin", "") ==
                                                  from_jid.bare()),
                                                 this->irc_channel_adhoc_commands_handler);
                  stanza_error.disable();
                }
424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454
            }
          else if (node.empty() && !iid.is_user && !iid.is_channel)
            { // Disco on an IRC server: get the list of channels
              bridge->send_irc_channel_list_request(iid, id, from);
              stanza_error.disable();
            }
        }
      else if ((query = stanza.get_child("ping", PING_NS)))
        {
          Iid iid(to.local);
          if (iid.is_user)
            { // Ping any user (no check on the nick done ourself)
              bridge->send_irc_user_ping_request(iid.get_server(),
                                                 iid.get_local(), id, from, to_str);
            }
          else if (iid.is_channel && !to.resource.empty())
            { // Ping a room participant (we check if the nick is in the room)
              bridge->send_irc_participant_ping_request(iid,
                                                        to.resource, id, from, to_str);
            }
          else
            { // Ping a channel, a server or the gateway itself
              bridge->on_gateway_ping(iid.get_server(),
                                     id, from, to_str);
            }
          stanza_error.disable();
        }
    }
  else if (type == "result")
    {
      stanza_error.disable();
455
      const XmlNode* query;
456 457
      if ((query = stanza.get_child("query", VERSION_NS)))
        {
458 459 460
          const XmlNode* name_node = query->get_child("name", VERSION_NS);
          const XmlNode* version_node = query->get_child("version", VERSION_NS);
          const XmlNode* os_node = query->get_child("os", VERSION_NS);
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482
          std::string name;
          std::string version;
          std::string os;
          if (name_node)
            name = name_node->get_inner() + " (through the biboumi gateway)";
          if (version_node)
            version = version_node->get_inner();
          if (os_node)
            os = os_node->get_inner();
          const Iid iid(to.local);
          bridge->send_xmpp_version_to_irc(iid, name, version, os);
        }
      else
        {
          const auto it = this->waiting_iq.find(id);
          if (it != this->waiting_iq.end())
            {
              it->second(bridge, stanza);
              this->waiting_iq.erase(it);
            }
        }
    }
483 484 485 486 487 488 489 490 491 492
  }
  catch (const IRCNotConnected& ex)
    {
      this->send_stanza_error("iq", from, to_str, id,
                              "cancel", "remote-server-not-found",
                              "Not connected to IRC server "s + ex.hostname,
                              true);
      stanza_error.disable();
      return;
    }
493 494 495 496 497 498 499 500 501 502 503 504
  error_type = "cancel";
  error_name = "feature-not-implemented";
}

Bridge* BiboumiComponent::get_user_bridge(const std::string& user_jid)
{
  try
    {
      return this->bridges.at(user_jid).get();
    }
  catch (const std::out_of_range& exception)
    {
505
      this->bridges.emplace(user_jid, std::make_unique<Bridge>(user_jid, *this, this->poller));
506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596
      return this->bridges.at(user_jid).get();
    }
}

Bridge* BiboumiComponent::find_user_bridge(const std::string& user_jid)
{
  try
    {
      return this->bridges.at(user_jid).get();
    }
  catch (const std::out_of_range& exception)
    {
      return nullptr;
    }
}

std::list<Bridge*> BiboumiComponent::get_bridges() const
{
  std::list<Bridge*> res;
  for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
    res.push_back(it->second.get());
  return res;
}

void BiboumiComponent::send_self_disco_info(const std::string& id, const std::string& jid_to)
{
  Stanza iq("iq");
  iq["type"] = "result";
  iq["id"] = id;
  iq["to"] = jid_to;
  iq["from"] = this->served_hostname;
  XmlNode query("query");
  query["xmlns"] = DISCO_INFO_NS;
  XmlNode identity("identity");
  identity["category"] = "conference";
  identity["type"] = "irc";
  identity["name"] = "Biboumi XMPP-IRC gateway";
  query.add_child(std::move(identity));
  for (const std::string& ns: {DISCO_INFO_NS, MUC_NS, ADHOC_NS})
    {
      XmlNode feature("feature");
      feature["var"] = ns;
      query.add_child(std::move(feature));
    }
  iq.add_child(std::move(query));
  this->send_stanza(iq);
}

void BiboumiComponent::send_iq_version_request(const std::string& from,
                                            const std::string& jid_to)
{
  Stanza iq("iq");
  iq["type"] = "get";
  iq["id"] = "version_"s + this->next_id();
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = jid_to;
  XmlNode query("query");
  query["xmlns"] = VERSION_NS;
  iq.add_child(std::move(query));
  this->send_stanza(iq);
}

void BiboumiComponent::send_ping_request(const std::string& from,
                                      const std::string& jid_to,
                                      const std::string& id)
{
  Stanza iq("iq");
  iq["type"] = "get";
  iq["id"] = id;
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = jid_to;
  XmlNode ping("ping");
  ping["xmlns"] = PING_NS;
  iq.add_child(std::move(ping));
  this->send_stanza(iq);

  auto result_cb = [from, id](Bridge* bridge, const Stanza& stanza)
    {
      Jid to(stanza.get_tag("to"));
      if (to.local != from)
        {
          log_error("Received a corresponding ping result, but the 'to' from "
                    "the response mismatches the 'from' of the request");
        }
      else
        bridge->send_irc_ping_result(from, id);
    };
  this->waiting_iq[id] = result_cb;
}

void BiboumiComponent::send_iq_room_list_result(const std::string& id,
597
                                             const std::string& to_jid,
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
                                             const std::string& from,
                                             const std::vector<ListElement>& rooms_list)
{
  Stanza iq("iq");
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = to_jid;
  iq["id"] = id;
  iq["type"] = "result";
  XmlNode query("query");
  query["xmlns"] = DISCO_ITEMS_NS;
  for (const auto& room: rooms_list)
    {
      XmlNode item("item");
      item["jid"] = room.channel + "%" + from + "@" + this->served_hostname;
      query.add_child(std::move(item));
    }
  iq.add_child(std::move(query));
  this->send_stanza(iq);
}