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.
14 * Copyright (C) 2007-2009 Othmar Gsenger, Erwin Nindl,
15 * Christian Pointner <satp@wirdorange.org>
17 * This file is part of Anytun.
19 * Anytun is free software: you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation, either version 3 of the License, or
24 * Anytun is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with anytun. If not, see <http://www.gnu.org/licenses/>.
33 #include <boost/bind.hpp>
34 #include <boost/thread.hpp>
35 #include <boost/assign.hpp>
39 #include "datatypes.h"
44 #include "plainPacket.h"
45 #include "encryptedPacket.h"
47 #include "keyDerivation.h"
49 #include "cipherFactory.h"
50 #include "authAlgoFactory.h"
51 #include "keyDerivationFactory.h"
52 #include "signalController.h"
54 # include "daemonService.h"
57 # include "win32/winService.h"
59 # include "nullDaemon.h"
62 #include "packetSource.h"
63 #include "tunDevice.h"
65 #include "seqWindow.h"
66 #include "connectionList.h"
68 #include "routingTable.h"
69 #include "networkAddress.h"
73 #include "syncQueue.h"
74 #include "syncCommand.h"
75 #include "syncServer.h"
76 #include "syncClient.h"
77 #include "syncOnConnect.hpp"
80 #include "cryptinit.hpp"
83 bool disableRouting = false;
85 void createConnection(const PacketSourceEndpoint& remote_end, window_size_t seqSize, mux_t mux)
87 SeqWindow* seq = new SeqWindow(seqSize);
89 KeyDerivation * kd = KeyDerivationFactory::create(gOpt.getKdPrf());
90 kd->init(gOpt.getKey(), gOpt.getSalt(), gOpt.getPassphrase());
91 kd->setRole(gOpt.getRole());
92 cLog.msg(Log::PRIO_NOTICE) << "added connection remote host " << remote_end;
94 ConnectionParam connparam ((*kd), (*seq), seq_nr_, remote_end);
95 gConnectionList.addConnection(connparam,mux);
97 SyncCommand sc (gConnectionList,mux);
102 void createConnectionResolver(PacketSourceResolverIt& it, window_size_t seqSize, mux_t mux)
104 createConnection(*it, seqSize, mux);
107 void createConnectionError(const std::exception& e)
109 gSignalController.inject(SIGERROR, e.what());
112 #ifndef ANYTUN_NOSYNC
113 void syncConnector(const OptionHost& connto)
115 SyncClient sc(connto.addr, connto.port);
123 SyncServer server(gOpt.getLocalSyncAddr(), gOpt.getLocalSyncPort(), boost::bind(syncOnConnect, _1));
124 gSyncQueue.setSyncServerPtr(&server);
127 catch(std::runtime_error& e) {
128 cLog.msg(Log::PRIO_ERROR) << "sync listener thread died due to an uncaught runtime_error: " << e.what();
130 catch(std::exception& e) {
131 cLog.msg(Log::PRIO_ERROR) << "sync listener thread died due to an uncaught exception: " << e.what();
136 void sender(TunDevice* dev, PacketSource* src)
139 cLog.msg(Log::PRIO_ERROR) << "sender thread died because either dev or src pointer is null";
145 std::auto_ptr<Cipher> c(CipherFactory::create(gOpt.getCipher(), KD_OUTBOUND));
146 std::auto_ptr<AuthAlgo> a(AuthAlgoFactory::create(gOpt.getAuthAlgo(), KD_OUTBOUND) );
148 PlainPacket plain_packet(MAX_PACKET_LENGTH);
149 EncryptedPacket encrypted_packet(MAX_PACKET_LENGTH, gOpt.getAuthTagLength());
151 u_int16_t mux = gOpt.getMux();
152 PacketSourceEndpoint emptyEndpoint;
154 plain_packet.setLength(MAX_PACKET_LENGTH);
155 encrypted_packet.withAuthTag(false);
156 encrypted_packet.setLength(MAX_PACKET_LENGTH);
158 // read packet from device
159 int len = dev->read(plain_packet.getPayload(), plain_packet.getPayloadLength());
161 continue; // silently ignore device read errors, this is probably no good idea...
163 if(static_cast<u_int32_t>(len) < PlainPacket::getHeaderLength())
164 continue; // ignore short packets
165 plain_packet.setPayloadLength(len);
167 if(dev->getType() == TYPE_TUN)
168 plain_packet.setPayloadType(PAYLOAD_TYPE_TUN);
169 else if(dev->getType() == TYPE_TAP)
170 plain_packet.setPayloadType(PAYLOAD_TYPE_TAP);
172 plain_packet.setPayloadType(0);
174 if(gConnectionList.empty())
176 //std::cout << "got Packet for plain "<<plain_packet.getDstAddr().toString();
177 ConnectionMap::iterator cit;
181 mux = gRoutingTable.getRoute(plain_packet.getDstAddr());
182 //std::cout << " -> "<<mux << std::endl;
183 cit = gConnectionList.getConnection(mux);
184 } catch (std::exception&) { continue; } // no route
186 cit = gConnectionList.getBegin();
188 cit = gConnectionList.getBegin();
191 if(cit==gConnectionList.getEnd())
192 continue; //no connection
193 ConnectionParam & conn = cit->second;
195 if(conn.remote_end_ == emptyEndpoint) {
196 //cLog.msg(Log::PRIO_INFO) << "no remote address set";
201 c->encrypt(conn.kd_, plain_packet, encrypted_packet, conn.seq_nr_, gOpt.getSenderId(), mux);
203 encrypted_packet.setHeader(conn.seq_nr_, gOpt.getSenderId(), mux);
206 // add authentication tag
207 a->generate(conn.kd_, encrypted_packet);
210 src->send(encrypted_packet.getBuf(), encrypted_packet.getLength(), conn.remote_end_);
211 } catch (std::exception& /*e*/) {
212 //TODO: do something here
213 //cLog.msg(Log::PRIO_ERROR) << "could not send data: " << e.what();
217 catch(std::runtime_error& e) {
218 cLog.msg(Log::PRIO_ERROR) << "sender thread died due to an uncaught runtime_error: " << e.what();
220 catch(std::exception& e) {
221 cLog.msg(Log::PRIO_ERROR) << "sender thread died due to an uncaught exception: " << e.what();
225 void receiver(TunDevice* dev, PacketSource* src)
228 cLog.msg(Log::PRIO_ERROR) << "receiver thread died because either dev or src pointer is null";
234 std::auto_ptr<Cipher> c(CipherFactory::create(gOpt.getCipher(), KD_INBOUND));
235 std::auto_ptr<AuthAlgo> a(AuthAlgoFactory::create(gOpt.getAuthAlgo(), KD_INBOUND));
237 u_int32_t auth_tag_length = gOpt.getAuthTagLength();
238 EncryptedPacket encrypted_packet(MAX_PACKET_LENGTH, auth_tag_length);
239 PlainPacket plain_packet(MAX_PACKET_LENGTH);
242 PacketSourceEndpoint remote_end;
244 plain_packet.setLength(MAX_PACKET_LENGTH);
245 encrypted_packet.withAuthTag(false);
246 encrypted_packet.setLength(MAX_PACKET_LENGTH);
248 // read packet from socket
251 len = src->recv(encrypted_packet.getBuf(), encrypted_packet.getLength(), remote_end);
252 } catch (std::exception& /*e*/) {
253 //TODO: do something here
254 //cLog.msg(Log::PRIO_ERROR) << "could not recive packet "<< e.what();
258 continue; // silently ignore socket recv errors, this is probably no good idea...
260 if(static_cast<u_int32_t>(len) < (EncryptedPacket::getHeaderLength() + auth_tag_length))
261 continue; // ignore short packets
262 encrypted_packet.setLength(len);
264 mux_t mux = encrypted_packet.getMux();
266 if( gConnectionList.empty() && gOpt.getRemoteAddr() == "") {
267 cLog.msg(Log::PRIO_NOTICE) << "autodetected remote host " << remote_end;
268 createConnection(remote_end, gOpt.getSeqWindowSize(),mux);
271 ConnectionMap::iterator cit = gConnectionList.getConnection(mux);
272 if (cit == gConnectionList.getEnd())
274 ConnectionParam & conn = cit->second;
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!";
283 if(conn.seq_window_.checkAndAdd(encrypted_packet.getSenderId(), encrypted_packet.getSeqNr())) {
284 cLog.msg(Log::PRIO_NOTICE) << "Replay attack from " << conn.remote_end_
285 << " seq:"<< encrypted_packet.getSeqNr() << " sid: "<< encrypted_packet.getSenderId();
289 //Allow dynamic IP changes
290 //TODO: add command line option to turn this off
291 if (remote_end != conn.remote_end_) {
292 cLog.msg(Log::PRIO_NOTICE) << "connection "<< mux << " autodetected remote host ip changed " << remote_end;
293 conn.remote_end_=remote_end;
294 #ifndef ANYTUN_NOSYNC
295 SyncCommand sc (gConnectionList,mux);
299 // ignore zero length packets
300 if(encrypted_packet.getPayloadLength() <= PlainPacket::getHeaderLength())
304 c->decrypt(conn.kd_, encrypted_packet, plain_packet);
306 // check payload_type
307 if((dev->getType() == TYPE_TUN && plain_packet.getPayloadType() != PAYLOAD_TYPE_TUN4 &&
308 plain_packet.getPayloadType() != PAYLOAD_TYPE_TUN6) ||
309 (dev->getType() == TYPE_TAP && plain_packet.getPayloadType() != PAYLOAD_TYPE_TAP))
312 // write it on the device
313 dev->write(plain_packet.getPayload(), plain_packet.getLength());
316 catch(std::runtime_error& e) {
317 cLog.msg(Log::PRIO_ERROR) << "receiver thread died due to an uncaught runtime_error: " << e.what();
319 catch(std::exception& e) {
320 cLog.msg(Log::PRIO_ERROR) << "receiver thread died due to an uncaught exception: " << e.what();
324 void startSendRecvThreads(TunDevice* dev, PacketSource* src)
326 src->waitUntilReady();
328 boost::thread(boost::bind(sender, dev, src));
329 boost::thread(boost::bind(receiver, dev, src));
334 int main(int argc, char* argv[])
338 if(std::string(argv[1]) == "install") {
339 WinService::install();
342 else if(std::string(argv[1]) == "uninstall") {
343 WinService::uninstall();
350 catch(std::runtime_error& e)
352 std::cout << "caught runtime error, exiting: " << e.what() << std::endl;
354 catch(std::exception& e)
356 std::cout << "caught exception, exiting: " << e.what() << std::endl;
360 int real_main(int argc, char* argv[], WinService& service)
363 int main(int argc, char* argv[])
365 DaemonService service;
371 if(!gOpt.parse(argc, argv))
374 StringList targets = gOpt.getLogTargets();
375 for(StringList::const_iterator it = targets.begin();it != targets.end(); ++it)
378 catch(syntax_error& e)
380 std::cerr << e << std::endl;
385 cLog.msg(Log::PRIO_NOTICE) << "anytun started...";
386 gOpt.parse_post(); // print warnings
388 // daemonizing has to done before any thread gets started
389 service.initPrivs(gOpt.getUsername(), gOpt.getGroupname());
390 if(gOpt.getDaemonize())
393 OptionNetwork net = gOpt.getIfconfigParam();
394 TunDevice dev(gOpt.getDevName(), gOpt.getDevType(), net.net_addr, net.prefix_length);
395 cLog.msg(Log::PRIO_NOTICE) << "dev opened - name '" << dev.getActualName() << "', node '" << dev.getActualNode() << "'";
396 cLog.msg(Log::PRIO_NOTICE) << "dev type is '" << dev.getTypeString() << "'";
398 SysExec * postup_script = NULL;
399 if(gOpt.getPostUpScript() != "") {
400 cLog.msg(Log::PRIO_NOTICE) << "executing post-up script '" << gOpt.getPostUpScript() << "'";
401 StringVector args = boost::assign::list_of(dev.getActualName())(dev.getActualNode());
402 postup_script = new SysExec(gOpt.getPostUpScript(), args);
405 if(gOpt.getChrootDir() != "") {
407 service.chroot(gOpt.getChrootDir());
409 catch(const std::runtime_error& e) {
410 cLog.msg(Log::PRIO_WARNING) << "ignoring chroot error: " << e.what();
415 // this has to be called before the first thread is started
416 gSignalController.init(service);
418 boost::thread(boost::bind(&TunDevice::waitUntilReady,&dev));
420 boost::thread(boost::bind(&SysExec::waitAndDestroy,postup_script));
424 PacketSource* src = new UDPPacketSource(gOpt.getLocalAddr(), gOpt.getLocalPort());
426 if(gOpt.getRemoteAddr() != "")
427 gResolver.resolveUdp(gOpt.getRemoteAddr(), gOpt.getRemotePort(), boost::bind(createConnectionResolver, _1, gOpt.getSeqWindowSize(), gOpt.getMux()), boost::bind(createConnectionError, _1), gOpt.getResolvAddrType());
429 HostList connect_to = gOpt.getRemoteSyncHosts();
431 NetworkList routes = gOpt.getRoutes();
432 NetworkList::const_iterator rit;
433 for(rit = routes.begin(); rit != routes.end(); ++rit) {
434 NetworkAddress addr( rit->net_addr );
435 NetworkPrefix prefix( addr, static_cast<u_int8_t>(rit->prefix_length));
436 gRoutingTable.addRoute( prefix, gOpt.getMux() );
438 if (connect_to.begin() == connect_to.end() || gOpt.getDevType()!="tun") {
439 cLog.msg(Log::PRIO_NOTICE) << "No sync/control host defined or not a tun device. Disabling multi connection support (routing)";
444 #ifndef ANYTUN_NOSYNC
445 boost::thread* syncListenerThread = NULL;
446 if(gOpt.getLocalSyncPort() != "")
447 syncListenerThread = new boost::thread(boost::bind(syncListener));
449 boost::thread_group connectThreads;
450 for(HostList::const_iterator it = connect_to.begin() ;it != connect_to.end(); ++it)
451 connectThreads.create_thread(boost::bind(syncConnector, *it));
454 // wait for packet source to finish in a seperate thread in order
455 // to be still able to process signals while waiting
456 boost::thread(boost::bind(startSendRecvThreads, &dev, src));
458 int ret = gSignalController.run();
460 // TODO: stop all threads and cleanup
468 catch(std::runtime_error& e)
470 cLog.msg(Log::PRIO_ERROR) << "uncaught runtime error, exiting: " << e.what();
471 if(!service.isDaemonized())
472 std::cout << "uncaught runtime error, exiting: " << e.what() << std::endl;
474 catch(std::exception& e)
476 cLog.msg(Log::PRIO_ERROR) << "uncaught exception, exiting: " << e.what();
477 if(!service.isDaemonized())
478 std::cout << "uncaught exception, exiting: " << e.what() << std::endl;