src/anytun.cpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
  15  *                          Christian Pointner <satp@wirdorange.org>
  16  *
  17  *  This file is part of Anytun.
  18  *
  19  *  Anytun is free software: you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License version 3 as
  21  *  published by the Free Software Foundation.
  22  *
  23  *  Anytun is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 #include <iostream>
  33 #include <fstream>
  34
  35
  36 #include <boost/bind.hpp>
  37 #include <cerrno>     // for ENOMEM
  38
  39 #include "datatypes.h"
  40
  41 #include "log.h"
  42 #include "buffer.h"
  43 #include "plainPacket.h"
  44 #include "encryptedPacket.h"
  45 #include "cipher.h"
  46 #include "keyDerivation.h"
  47 #include "authAlgo.h"
  48 #include "cipherFactory.h"
  49 #include "authAlgoFactory.h"
  50 #include "keyDerivationFactory.h"
  51 #ifndef NOSIGNALCONTROLLER
  52 #include "signalController.h"
  53 #endif
  54 #include "packetSource.h"
  55 #include "tunDevice.h"
  56 #include "options.h"
  57 #include "seqWindow.h"
  58 #include "connectionList.h"
  59 #ifndef NOROUTING
  60 #include "routingTable.h"
  61 #include "networkAddress.h"
  62 #endif
  63
  64
  65 #ifndef ANYTUN_NOSYNC
  66 #include "syncQueue.h"
  67 #include "syncCommand.h"
  68 #include "syncServer.h"
  69 #include "syncClient.h"
  70 #include "syncOnConnect.hpp"
  71 #endif
  72
  73 #include "threadParam.h"
  74 #define MAX_PACKET_LENGTH 1600
  75
  76 #include "cryptinit.hpp"
  77 #include "daemon.hpp"
  78 #include "sysexec.hpp"
  79
  80 void createConnection(const PacketSourceEndpoint & remote_end, window_size_t seqSize, mux_t mux)
  81 {
  82         SeqWindow* seq = new SeqWindow(seqSize);
  83         seq_nr_t seq_nr_=0;
  84   KeyDerivation * kd = KeyDerivationFactory::create(gOpt.getKdPrf());
  85   kd->init(gOpt.getKey(), gOpt.getSalt(), gOpt.getPassphrase());
  86   kd->setLogKDRate(gOpt.getLdKdr());
  87   cLog.msg(Log::PRIO_NOTICE) << "added connection remote host " << remote_end;
  88
  89         ConnectionParam connparam ((*kd), (*seq), seq_nr_, remote_end);
  90         gConnectionList.addConnection(connparam,mux);
  91 #ifndef ANYTUN_NOSYNC
  92   SyncCommand sc (gConnectionList,mux);
  93         gSyncQueue.push(sc);
  94 #endif
  95 #ifndef NOROUTING
  96         if (gOpt.getIfconfigParamRemoteNetmask() != "")
  97         {
  98                 NetworkAddress addr(gOpt.getIfconfigParamRemoteNetmask());
  99                 NetworkPrefix prefix(addr,128);
 100                 gRoutingTable.addRoute(prefix,mux);
 101 #ifndef ANYTUN_NOSYNC
 102                 SyncCommand sc2 (prefix);
 103                 gSyncQueue.push(sc2);
 104 #endif
 105         }
 106 #endif
 107 }
 108
 109 #ifndef ANYTUN_NOSYNC
 110 void syncConnector(void* p )
 111 {
 112         ThreadParam* param = reinterpret_cast<ThreadParam*>(p);
 113
 114         SyncClient sc ( param->connto.addr, param->connto.port);
 115         sc.run();
 116 }
 117
 118 void syncListener(SyncQueue * queue)
 119 {
 120   try
 121   {
 122     boost::asio::io_service io_service;
 123                 SyncTcpConnection::proto::resolver resolver(io_service);
 124                 SyncTcpConnection::proto::endpoint e;
 125                 if(gOpt.getLocalSyncAddr()!="")
 126                 {
 127                         SyncTcpConnection::proto::resolver::query query(gOpt.getLocalSyncAddr(), gOpt.getLocalSyncPort());
 128                         e = *resolver.resolve(query);
 129                 } else {
 130                         SyncTcpConnection::proto::resolver::query query(gOpt.getLocalSyncPort());
 131                         e = *resolver.resolve(query);
 132                 }
 133
 134
 135     SyncServer server(io_service,e);
 136                 server.onConnect=boost::bind(syncOnConnect,_1);
 137                 queue->setSyncServerPtr(&server);
 138     io_service.run();
 139   }
 140   catch (std::exception& e)
 141   {
 142     std::string addr = gOpt.getLocalSyncAddr() == "" ? "*" : gOpt.getLocalSyncAddr();
 143     cLog.msg(Log::PRIO_ERR) << "sync: cannot bind to " << addr << ":" << gOpt.getLocalSyncPort()
 144                             << " (" << e.what() << ")" << std::endl;
 145   }
 146
 147 }
 148 #endif
 149
 150 void sender(void* p)
 151 {
 152   try
 153   {
 154     ThreadParam* param = reinterpret_cast<ThreadParam*>(p);
 155
 156     std::auto_ptr<Cipher> c(CipherFactory::create(gOpt.getCipher(), KD_OUTBOUND));
 157     std::auto_ptr<AuthAlgo> a(AuthAlgoFactory::create(gOpt.getAuthAlgo(), KD_OUTBOUND) );
 158
 159     PlainPacket plain_packet(MAX_PACKET_LENGTH);
 160     EncryptedPacket encrypted_packet(MAX_PACKET_LENGTH);
 161
 162     u_int16_t mux = gOpt.getMux();
 163     PacketSourceEndpoint emptyEndpoint;
 164     while(1)
 165     {
 166       plain_packet.setLength(MAX_PACKET_LENGTH);
 167       encrypted_packet.withAuthTag(false);
 168       encrypted_packet.setLength(MAX_PACKET_LENGTH);
 169
 170           // read packet from device
 171       u_int32_t len = param->dev.read(plain_packet.getPayload(), plain_packet.getPayloadLength());
 172       plain_packet.setPayloadLength(len);
 173           // set payload type
 174       if(param->dev.getType() == TYPE_TUN)
 175         plain_packet.setPayloadType(PAYLOAD_TYPE_TUN);
 176       else if(param->dev.getType() == TYPE_TAP)
 177         plain_packet.setPayloadType(PAYLOAD_TYPE_TAP);
 178       else
 179         plain_packet.setPayloadType(0);
 180
 181       if(gConnectionList.empty())
 182         continue;
 183           //std::cout << "got Packet for plain "<<plain_packet.getDstAddr().toString();
 184                         ConnectionMap::iterator cit;
 185 #ifndef NOROUTING
 186                         try
 187                         {
 188                                 mux = gRoutingTable.getRoute(plain_packet.getDstAddr());
 189                                                 //std::cout << " -> "<<mux << std::endl;
 190                                 cit = gConnectionList.getConnection(mux);
 191                         }
 192                         catch (std::exception& e)
 193                         {
 194                                 continue; // no route
 195                         }
 196 #else
 197       cit = gConnectionList.getBegin();
 198 #endif
 199
 200       if(cit==gConnectionList.getEnd())
 201         continue; //no connection
 202       ConnectionParam & conn = cit->second;
 203
 204       if(conn.remote_end_ == emptyEndpoint)
 205                         {
 206         //cLog.msg(Log::PRIO_INFO) << "no remote address set";
 207         continue;
 208       }
 209
 210           // encrypt packet
 211       c->encrypt(conn.kd_, plain_packet, encrypted_packet, conn.seq_nr_, gOpt.getSenderId(), mux);
 212
 213       encrypted_packet.setHeader(conn.seq_nr_, gOpt.getSenderId(), mux);
 214       conn.seq_nr_++;
 215
 216           // add authentication tag
 217       a->generate(conn.kd_, encrypted_packet);
 218
 219       try
 220       {
 221         param->src.send(encrypted_packet.getBuf(), encrypted_packet.getLength(), conn.remote_end_);
 222       }
 223       catch (std::exception& e)
 224       {
 225             // ignoring icmp port unreachable :) and other socket errors :(
 226       }
 227     }
 228   }
 229   catch(std::runtime_error& e)
 230   {
 231     cLog.msg(Log::PRIO_ERR) << "sender thread died due to an uncaught runtime_error: " << e.what();
 232   }
 233   catch(std::exception& e)
 234   {
 235     cLog.msg(Log::PRIO_ERR) << "sender thread died due to an uncaught exception: " << e.what();
 236   }
 237 }
 238
 239 void receiver(void* p)
 240 {
 241   try
 242   {
 243     ThreadParam* param = reinterpret_cast<ThreadParam*>(p);
 244
 245     std::auto_ptr<Cipher> c( CipherFactory::create(gOpt.getCipher(), KD_INBOUND) );
 246     std::auto_ptr<AuthAlgo> a( AuthAlgoFactory::create(gOpt.getAuthAlgo(), KD_INBOUND) );
 247
 248     EncryptedPacket encrypted_packet(MAX_PACKET_LENGTH);
 249     PlainPacket plain_packet(MAX_PACKET_LENGTH);
 250
 251     while(1)
 252     {
 253       PacketSourceEndpoint remote_end;
 254
 255       plain_packet.setLength(MAX_PACKET_LENGTH);
 256       encrypted_packet.withAuthTag(false);
 257       encrypted_packet.setLength(MAX_PACKET_LENGTH);
 258
 259           // read packet from socket
 260       u_int32_t len = param->src.recv(encrypted_packet.getBuf(), encrypted_packet.getLength(), remote_end);
 261       encrypted_packet.setLength(len);
 262
 263       mux_t mux = encrypted_packet.getMux();
 264           // autodetect peer
 265       if( gConnectionList.empty() && gOpt.getRemoteAddr() == "")
 266       {
 267         cLog.msg(Log::PRIO_NOTICE) << "autodetected remote host " << remote_end;
 268         createConnection(remote_end, gOpt.getSeqWindowSize(),mux);
 269       }
 270
 271       ConnectionMap::iterator cit = gConnectionList.getConnection(mux);
 272       if (cit == gConnectionList.getEnd())
 273         continue;
 274       ConnectionParam & conn = cit->second;
 275
 276           // check whether auth tag is ok or not
 277       if(!a->checkTag(conn.kd_, encrypted_packet)) {
 278         cLog.msg(Log::PRIO_NOTICE) << "wrong Authentication Tag!" << std::endl;
 279         continue;
 280       }
 281
 282           //Allow dynamic IP changes
 283           //TODO: add command line option to turn this off
 284       if (remote_end != conn.remote_end_)
 285       {
 286         cLog.msg(Log::PRIO_NOTICE) << "connection "<< mux << " autodetected remote host ip changed " << remote_end;
 287         conn.remote_end_=remote_end;
 288 #ifndef ANYTUN_NOSYNC
 289         SyncCommand sc (gConnectionList,mux);
 290         gSyncQueue.push(sc);
 291 #endif
 292       }
 293
 294           // Replay Protection
 295       if(conn.seq_window_.checkAndAdd(encrypted_packet.getSenderId(), encrypted_packet.getSeqNr()))
 296       {
 297         cLog.msg(Log::PRIO_NOTICE) << "Replay attack from " << conn.remote_end_
 298                                    << " seq:"<< encrypted_packet.getSeqNr() << " sid: "<< encrypted_packet.getSenderId();
 299         continue;
 300       }
 301
 302           // decrypt packet
 303       c->decrypt(conn.kd_, encrypted_packet, plain_packet);
 304
 305           // check payload_type
 306       if((param->dev.getType() == TYPE_TUN && plain_packet.getPayloadType() != PAYLOAD_TYPE_TUN4 &&
 307                                               plain_packet.getPayloadType() != PAYLOAD_TYPE_TUN6) ||
 308          (param->dev.getType() == TYPE_TAP && plain_packet.getPayloadType() != PAYLOAD_TYPE_TAP))
 309         continue;
 310
 311           // write it on the device
 312       param->dev.write(plain_packet.getPayload(), plain_packet.getLength());
 313     }
 314   }
 315   catch(std::runtime_error& e)
 316   {
 317     cLog.msg(Log::PRIO_ERR) << "sender thread died due to an uncaught runtime_error: " << e.what();
 318   }
 319   catch(std::exception& e)
 320   {
 321     cLog.msg(Log::PRIO_ERR) << "receiver thread died due to an uncaught exception: " << e.what();
 322   }
 323 }
 324
 325
 326 int main(int argc, char* argv[])
 327 {
 328   bool daemonized=false;
 329   try
 330   {
 331     cLog.msg(Log::PRIO_NOTICE) << "anytun started...";
 332 ///  std::cout << "anytun - secure anycast tunneling protocol" << std::endl;
 333
 334     try
 335     {
 336       bool result = gOpt.parse(argc, argv);
 337       if(!result) {
 338         gOpt.printUsage();
 339         exit(0);
 340       }
 341     }
 342     catch(syntax_error& e)
 343     {
 344       std::cerr << e << std::endl;
 345       cLog.msg(Log::PRIO_NOTICE) << "exitting after syntax error";
 346       gOpt.printUsage();
 347       exit(-1);
 348     }
 349
 350     std::ofstream pidFile;
 351     if(gOpt.getPidFile() != "") {
 352       pidFile.open(gOpt.getPidFile().c_str());
 353       if(!pidFile.is_open()) {
 354         std::cout << "can't open pid file" << std::endl;
 355       }
 356     }
 357
 358 #ifndef NOCRYPT
 359 #ifndef USE_SSL_CRYPTO
 360 // this must be called before any other libgcrypt call
 361     if(!initLibGCrypt())
 362       return -1;
 363 #endif
 364 #endif
 365
 366     TunDevice dev(gOpt.getDevName(), gOpt.getDevType(), gOpt.getIfconfigParamLocal(), gOpt.getIfconfigParamRemoteNetmask());
 367     cLog.msg(Log::PRIO_NOTICE) << "dev created (opened)";
 368     cLog.msg(Log::PRIO_NOTICE) << "dev opened - actual name is '" << dev.getActualName() << "'";
 369     cLog.msg(Log::PRIO_NOTICE) << "dev type is '" << dev.getTypeString() << "'";
 370 #ifndef NOEXEC
 371     if(gOpt.getPostUpScript() != "") {
 372       int postup_ret = execScript(gOpt.getPostUpScript(), dev.getActualName());
 373       cLog.msg(Log::PRIO_NOTICE) << "post up script '" << gOpt.getPostUpScript() << "' returned " << postup_ret;
 374     }
 375 #endif
 376
 377     PacketSource* src;
 378     if(gOpt.getLocalAddr() == "")
 379       src = new UDPPacketSource(gOpt.getLocalPort());
 380     else
 381       src = new UDPPacketSource(gOpt.getLocalAddr(), gOpt.getLocalPort());
 382
 383     HostList connect_to = gOpt.getRemoteSyncHosts();
 384     SyncQueue queue;
 385
 386     if(gOpt.getRemoteAddr() != "")
 387     {
 388       boost::asio::io_service io_service;
 389       UDPPacketSource::proto::resolver resolver(io_service);
 390       UDPPacketSource::proto::resolver::query query(gOpt.getRemoteAddr(), gOpt.getRemotePort());
 391       UDPPacketSource::proto::endpoint endpoint = *resolver.resolve(query);
 392       createConnection(endpoint,gOpt.getSeqWindowSize(), gOpt.getMux());
 393     }
 394
 395                 RouteList routes = gOpt.getRoutes();
 396                 RouteList::const_iterator rit;
 397                 for(rit = routes.begin(); rit != routes.end(); ++rit)
 398                 {
 399                         NetworkAddress addr( rit->net_addr );
 400                         NetworkPrefix prefix( addr, static_cast<u_int8_t>(rit->prefix_length));
 401                         gRoutingTable.addRoute( prefix, gOpt.getMux() );
 402                 }
 403                 if (connect_to.begin() == connect_to.end() && routes.begin() == routes.end() && gOpt.getDevType()=="tun")
 404                 {
 405                         std::cout << "No Routes and no syncronisation hosts have be specified"<< std::endl;
 406                         std::cout << "anytun won't be able to send any data"<< std::endl;
 407                         std::cout << "most likely you want to add --route 0.0.0.0/0 --route ::/0"<< std::endl;
 408                         std::cout << "to your command line to allow both ipv4 and ipv6 traffic"<< std::endl;
 409                         std::cout << "(this does not set operating system routes, use the post-up script"<< std::endl;
 410                         std::cout << " to set them)"<< std::endl;
 411                         return -1;
 412                 }
 413 #ifndef NODAEMON
 414     if(gOpt.getChroot())
 415       chrootAndDrop(gOpt.getChrootDir(), gOpt.getUsername());
 416     if(gOpt.getDaemonize())
 417     {
 418       daemonize();
 419       daemonized = true;
 420     }
 421
 422     if(pidFile.is_open()) {
 423       pid_t pid = getpid();
 424       pidFile << pid;
 425       pidFile.close();
 426     }
 427 #endif
 428
 429 #ifndef NOSIGNALCONTROLLER
 430     SignalController sig;
 431     sig.init();
 432 #endif
 433
 434     OptionHost* connTo = new OptionHost();
 435     ThreadParam p(dev, *src, *connTo);
 436
 437     boost::thread senderThread(boost::bind(sender,&p));
 438 #ifndef NOSIGNALCONTROLLER
 439     boost::thread receiverThread(boost::bind(receiver,&p));
 440 #endif
 441 #ifndef ANYTUN_NOSYNC
 442     boost::thread * syncListenerThread;
 443     if(gOpt.getLocalSyncPort() != "")
 444       syncListenerThread = new boost::thread(boost::bind(syncListener,&queue));
 445
 446     std::list<boost::thread *> connectThreads;
 447     for(HostList::iterator it = connect_to.begin() ;it != connect_to.end(); ++it) {
 448       ThreadParam * point = new ThreadParam(dev, *src, *it);
 449       connectThreads.push_back(new boost::thread(boost::bind(syncConnector,point)));
 450     }
 451 #endif
 452
 453 #ifndef NOSIGNALCONTROLLER
 454     int ret = sig.run();
 455 #else
 456     receiver(&p);
 457     int ret = 0;
 458 #endif
 459     // TODO cleanup threads here!
 460     /*
 461     pthread_cancel(senderThread);
 462     pthread_cancel(receiverThread);
 463 #ifndef ANYTUN_NOSYNC
 464     if ( gOpt.getLocalSyncPort())
 465       pthread_cancel(syncListenerThread);
 466     for( std::list<pthread_t>::iterator it = connectThreads.begin() ;it != connectThreads.end(); ++it)
 467       pthread_cancel(*it);
 468 #endif
 469
 470     pthread_join(senderThread, NULL);
 471     pthread_join(receiverThread, NULL);
 472 #ifndef ANYTUN_NOSYNC
 473     if ( gOpt.getLocalSyncPort())
 474       pthread_join(syncListenerThread, NULL);
 475
 476     for( std::list<pthread_t>::iterator it = connectThreads.begin() ;it != connectThreads.end(); ++it)
 477       pthread_join(*it, NULL);
 478 #endif
 479     if(src)
 480       delete src;
 481     if(connTo)
 482       delete connTo;
 483     */
 484     return ret;
 485   }
 486   catch(std::runtime_error& e)
 487   {
 488     cLog.msg(Log::PRIO_ERR) << "uncaught runtime error, exiting: " << e.what();
 489 #ifndef LOGSTDOUT
 490         if(!daemonized)
 491       std::cout << "uncaught runtime error, exiting: " << e.what() << std::endl;
 492 #endif
 493   }
 494   catch(std::exception& e)
 495   {
 496     cLog.msg(Log::PRIO_ERR) << "uncaught exception, exiting: " << e.what();
 497 #ifndef LOGSTDOUT
 498         if(!daemonized)
 499       std::cout << "uncaught exception, exiting: " << e.what() << std::endl;
 500 #endif
 501   }
 502 }
 503
 504