More refactoring to clean up code, and add a gate function to make sure we do not handle OK packets we did not expect. This hardens up a few potential edge cases around security, since such messages might be used to e.g. pollute a cache and DOS under certain conditions.
This commit is contained in:
Adam Ierymenko
parent
16df2c3363
commit
0d4109a9f1
13 changed files with 170 additions and 83 deletions
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@ -156,6 +156,17 @@ bool IncomingPacket::_doERROR(const RuntimeEnvironment *RR,const SharedPtr<Peer>
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RR->node->postEvent(ZT_EVENT_FATAL_ERROR_IDENTITY_COLLISION);
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break;
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case Packet::ERROR_NEED_MEMBERSHIP_CERTIFICATE: {
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SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
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if ((network)&&(network->recentlyAllowedOnNetwork(peer))) {
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Packet outp(peer->address(),RR->identity.address(),Packet::VERB_NETWORK_CREDENTIALS);
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network->config().com.serialize(outp);
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outp.append((uint8_t)0);
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outp.armor(peer->key(),true);
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_path->send(RR,outp.data(),outp.size(),RR->node->now());
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}
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} break;
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case Packet::ERROR_NETWORK_ACCESS_DENIED_: {
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SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
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if ((network)&&(network->controller() == peer->address()))
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@ -163,10 +174,12 @@ bool IncomingPacket::_doERROR(const RuntimeEnvironment *RR,const SharedPtr<Peer>
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} break;
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case Packet::ERROR_UNWANTED_MULTICAST: {
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uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD);
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MulticastGroup mg(MAC(field(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD + 8,6),6),at<uint32_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD + 14));
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TRACE("%.16llx: peer %s unsubscrubed from multicast group %s",nwid,peer->address().toString().c_str(),mg.toString().c_str());
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RR->mc->remove(nwid,mg,peer->address());
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SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
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if ((network)&&(network->gate(peer,verb(),packetId()))) {
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MulticastGroup mg(MAC(field(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD + 8,6),6),at<uint32_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD + 14));
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TRACE("%.16llx: peer %s unsubscrubed from multicast group %s",network->id(),peer->address().toString().c_str(),mg.toString().c_str());
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RR->mc->remove(network->id(),mg,peer->address());
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}
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} break;
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default: break;
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@ -352,7 +365,12 @@ bool IncomingPacket::_doOK(const RuntimeEnvironment *RR,const SharedPtr<Peer> &p
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const Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_OK_IDX_IN_RE_VERB];
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const uint64_t inRePacketId = at<uint64_t>(ZT_PROTO_VERB_OK_IDX_IN_RE_PACKET_ID);
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//TRACE("%s(%s): OK(%s)",source().toString().c_str(),_path->address().toString().c_str(),Packet::verbString(inReVerb));
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if (!RR->node->expectingReplyTo(inRePacketId)) {
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TRACE("%s(%s): OK(%s) DROPPED: not expecting reply to %.16llx",peer->address().toString().c_str(),_path->address().toString().c_str(),Packet::verbString(inReVerb),packetId());
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return true;
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}
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//TRACE("%s(%s): OK(%s)",peer->address().toString().c_str(),_path->address().toString().c_str(),Packet::verbString(inReVerb));
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switch(inReVerb) {
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@ -424,10 +442,13 @@ bool IncomingPacket::_doOK(const RuntimeEnvironment *RR,const SharedPtr<Peer> &p
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case Packet::VERB_MULTICAST_GATHER: {
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const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_NETWORK_ID);
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const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_MAC,6),6),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_ADI));
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//TRACE("%s(%s): OK(MULTICAST_GATHER) %.16llx/%s length %u",source().toString().c_str(),_path->address().toString().c_str(),nwid,mg.toString().c_str(),size());
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const unsigned int count = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 4);
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RR->mc->addMultiple(RR->node->now(),nwid,mg,field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 6,count * 5),count,at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS));
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SharedPtr<Network> network(RR->node->network(nwid));
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if ((network)&&(network->gate(peer,verb(),packetId()))) {
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const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_MAC,6),6),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_ADI));
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//TRACE("%s(%s): OK(MULTICAST_GATHER) %.16llx/%s length %u",source().toString().c_str(),_path->address().toString().c_str(),nwid,mg.toString().c_str(),size());
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const unsigned int count = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 4);
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RR->mc->addMultiple(RR->node->now(),nwid,mg,field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 6,count * 5),count,at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS));
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}
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} break;
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case Packet::VERB_MULTICAST_FRAME: {
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@ -437,24 +458,26 @@ bool IncomingPacket::_doOK(const RuntimeEnvironment *RR,const SharedPtr<Peer> &p
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//TRACE("%s(%s): OK(MULTICAST_FRAME) %.16llx/%s flags %.2x",peer->address().toString().c_str(),_path->address().toString().c_str(),nwid,mg.toString().c_str(),flags);
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unsigned int offset = 0;
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SharedPtr<Network> network(RR->node->network(nwid));
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if (network) {
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unsigned int offset = 0;
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if ((flags & 0x01) != 0) { // deprecated but still used by older peers
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CertificateOfMembership com;
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offset += com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS);
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if (com) {
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SharedPtr<Network> network(RR->node->network(com.networkId()));
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if (network)
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if ((flags & 0x01) != 0) { // deprecated but still used by older peers
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CertificateOfMembership com;
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offset += com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS);
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if (com)
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network->addCredential(com);
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}
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}
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if ((flags & 0x02) != 0) {
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// OK(MULTICAST_FRAME) includes implicit gather results
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offset += ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS;
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unsigned int totalKnown = at<uint32_t>(offset); offset += 4;
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unsigned int count = at<uint16_t>(offset); offset += 2;
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RR->mc->addMultiple(RR->node->now(),nwid,mg,field(offset,count * 5),count,totalKnown);
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if (network->gate(peer,verb(),packetId())) {
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if ((flags & 0x02) != 0) {
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// OK(MULTICAST_FRAME) includes implicit gather results
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offset += ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS;
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unsigned int totalKnown = at<uint32_t>(offset); offset += 4;
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unsigned int count = at<uint16_t>(offset); offset += 2;
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RR->mc->addMultiple(RR->node->now(),nwid,mg,field(offset,count * 5),count,totalKnown);
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}
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}
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}
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} break;
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@ -515,27 +538,29 @@ bool IncomingPacket::_doWHOIS(const RuntimeEnvironment *RR,const SharedPtr<Peer>
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bool IncomingPacket::_doRENDEZVOUS(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
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{
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try {
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const Address with(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
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const SharedPtr<Peer> rendezvousWith(RR->topology->getPeer(with));
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if (rendezvousWith) {
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const unsigned int port = at<uint16_t>(ZT_PROTO_VERB_RENDEZVOUS_IDX_PORT);
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const unsigned int addrlen = (*this)[ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRLEN];
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if ((port > 0)&&((addrlen == 4)||(addrlen == 16))) {
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const InetAddress atAddr(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRESS,addrlen),addrlen,port);
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if (!RR->topology->isUpstream(peer->identity())) {
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TRACE("RENDEZVOUS from %s says %s might be at %s, ignoring since peer is not upstream",peer->address().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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} else if (RR->node->shouldUsePathForZeroTierTraffic(_path->localAddress(),atAddr)) {
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RR->node->putPacket(_path->localAddress(),atAddr,"ABRE",4,2); // send low-TTL junk packet to 'open' local NAT(s) and stateful firewalls
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rendezvousWith->attemptToContactAt(_path->localAddress(),atAddr,RR->node->now());
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TRACE("RENDEZVOUS from %s says %s might be at %s, sent verification attempt",peer->address().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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if (!RR->topology->isUpstream(peer->identity())) {
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TRACE("RENDEZVOUS from %s ignored since source is not upstream",peer->address().toString().c_str());
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} else {
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const Address with(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
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const SharedPtr<Peer> rendezvousWith(RR->topology->getPeer(with));
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if (rendezvousWith) {
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const unsigned int port = at<uint16_t>(ZT_PROTO_VERB_RENDEZVOUS_IDX_PORT);
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const unsigned int addrlen = (*this)[ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRLEN];
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if ((port > 0)&&((addrlen == 4)||(addrlen == 16))) {
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const InetAddress atAddr(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRESS,addrlen),addrlen,port);
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if (RR->node->shouldUsePathForZeroTierTraffic(_path->localAddress(),atAddr)) {
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RR->node->putPacket(_path->localAddress(),atAddr,"ABRE",4,2); // send low-TTL junk packet to 'open' local NAT(s) and stateful firewalls
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rendezvousWith->attemptToContactAt(_path->localAddress(),atAddr,RR->node->now());
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TRACE("RENDEZVOUS from %s says %s might be at %s, sent verification attempt",peer->address().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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} else {
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TRACE("RENDEZVOUS from %s says %s might be at %s, ignoring since path is not suitable",peer->address().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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}
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} else {
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TRACE("RENDEZVOUS from %s says %s might be at %s, ignoring since path is not suitable",peer->address().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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TRACE("dropped corrupt RENDEZVOUS from %s(%s) (bad address or port)",peer->address().toString().c_str(),_path->address().toString().c_str());
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}
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} else {
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TRACE("dropped corrupt RENDEZVOUS from %s(%s) (bad address or port)",peer->address().toString().c_str(),_path->address().toString().c_str());
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TRACE("ignored RENDEZVOUS from %s(%s) to meet unknown peer %s",peer->address().toString().c_str(),_path->address().toString().c_str(),with.toString().c_str());
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}
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} else {
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TRACE("ignored RENDEZVOUS from %s(%s) to meet unknown peer %s",peer->address().toString().c_str(),_path->address().toString().c_str(),with.toString().c_str());
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}
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peer->received(_path,hops(),packetId(),Packet::VERB_RENDEZVOUS,0,Packet::VERB_NOP,false);
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} catch ( ... ) {
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@ -549,25 +574,25 @@ bool IncomingPacket::_doFRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer>
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try {
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const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID);
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const SharedPtr<Network> network(RR->node->network(nwid));
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bool approved = false;
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bool trustEstablished = false;
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if (network) {
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if (size() > ZT_PROTO_VERB_FRAME_IDX_PAYLOAD) {
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if (!network->gate(peer,verb(),packetId())) {
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TRACE("dropped FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_path->address().toString().c_str(),(unsigned long long)network->id());
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} else {
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if (!network->gate(peer,verb(),packetId())) {
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TRACE("dropped FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_path->address().toString().c_str(),(unsigned long long)network->id());
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} else {
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trustEstablished = true;
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if (size() > ZT_PROTO_VERB_FRAME_IDX_PAYLOAD) {
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const unsigned int etherType = at<uint16_t>(ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE);
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const MAC sourceMac(peer->address(),nwid);
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const unsigned int frameLen = size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD;
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const uint8_t *const frameData = reinterpret_cast<const uint8_t *>(data()) + ZT_PROTO_VERB_FRAME_IDX_PAYLOAD;
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if (network->filterIncomingPacket(peer,RR->identity.address(),sourceMac,network->mac(),frameData,frameLen,etherType,0) > 0)
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RR->node->putFrame(nwid,network->userPtr(),sourceMac,network->mac(),etherType,0,(const void *)frameData,frameLen);
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approved = true; // this means approved on the network in general, not this packet per se
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}
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}
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} else {
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TRACE("dropped FRAME from %s(%s): we are not a member of network %.16llx",source().toString().c_str(),_path->address().toString().c_str(),at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
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}
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peer->received(_path,hops(),packetId(),Packet::VERB_FRAME,0,Packet::VERB_NOP,approved);
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peer->received(_path,hops(),packetId(),Packet::VERB_FRAME,0,Packet::VERB_NOP,trustEstablished);
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} catch ( ... ) {
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TRACE("dropped FRAME from %s(%s): unexpected exception",source().toString().c_str(),_path->address().toString().c_str());
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}
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@ -580,23 +605,23 @@ bool IncomingPacket::_doEXT_FRAME(const RuntimeEnvironment *RR,const SharedPtr<P
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const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_EXT_FRAME_IDX_NETWORK_ID);
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const SharedPtr<Network> network(RR->node->network(nwid));
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if (network) {
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const unsigned int flags = (*this)[ZT_PROTO_VERB_EXT_FRAME_IDX_FLAGS];
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unsigned int comLen = 0;
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if ((flags & 0x01) != 0) { // inline COM with EXT_FRAME is deprecated but still used with old peers
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CertificateOfMembership com;
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comLen = com.deserialize(*this,ZT_PROTO_VERB_EXT_FRAME_IDX_COM);
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if (com)
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network->addCredential(com);
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}
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if (!network->gate(peer,verb(),packetId())) {
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TRACE("dropped EXT_FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_path->address().toString().c_str(),network->id());
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peer->received(_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,false);
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return true;
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}
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if (size() > ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD) {
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const unsigned int flags = (*this)[ZT_PROTO_VERB_EXT_FRAME_IDX_FLAGS];
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unsigned int comLen = 0;
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if ((flags & 0x01) != 0) { // deprecated but still used by old peers
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CertificateOfMembership com;
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comLen = com.deserialize(*this,ZT_PROTO_VERB_EXT_FRAME_IDX_COM);
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if (com)
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network->addCredential(com);
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}
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if (!network->gate(peer,verb(),packetId())) {
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TRACE("dropped EXT_FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_path->address().toString().c_str(),network->id());
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peer->received(_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,false);
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return true;
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}
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const unsigned int etherType = at<uint16_t>(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_ETHERTYPE);
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const MAC to(field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_TO,ZT_PROTO_VERB_EXT_FRAME_LEN_TO),ZT_PROTO_VERB_EXT_FRAME_LEN_TO);
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const MAC from(field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_FROM,ZT_PROTO_VERB_EXT_FRAME_LEN_FROM),ZT_PROTO_VERB_EXT_FRAME_LEN_FROM);
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@ -604,7 +629,7 @@ bool IncomingPacket::_doEXT_FRAME(const RuntimeEnvironment *RR,const SharedPtr<P
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const uint8_t *const frameData = (const uint8_t *)field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD,frameLen);
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if ((!from)||(from.isMulticast())||(from == network->mac())) {
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TRACE("dropped EXT_FRAME from %s@%s(%s) to %s: invalid source MAC",from.toString().c_str(),peer->address().toString().c_str(),_path->address().toString().c_str(),to.toString().c_str());
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TRACE("dropped EXT_FRAME from %s@%s(%s) to %s: invalid source MAC %s",from.toString().c_str(),peer->address().toString().c_str(),_path->address().toString().c_str(),to.toString().c_str(),from.toString().c_str());
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peer->received(_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,true); // trustEstablished because COM is okay
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return true;
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}
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@ -1139,6 +1164,8 @@ bool IncomingPacket::_doCIRCUIT_TEST(const RuntimeEnvironment *RR,const SharedPt
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// Add length of second "additional fields" section.
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vlf += at<uint16_t>(ZT_PACKET_IDX_PAYLOAD + 29 + vlf);
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uint64_t reportFlags = 0;
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// Check credentials (signature already verified)
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if (originatorCredentialNetworkId) {
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SharedPtr<Network> network(RR->node->network(originatorCredentialNetworkId));
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@ -1147,6 +1174,8 @@ bool IncomingPacket::_doCIRCUIT_TEST(const RuntimeEnvironment *RR,const SharedPt
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peer->received(_path,hops(),packetId(),Packet::VERB_CIRCUIT_TEST,0,Packet::VERB_NOP,false);
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return true;
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}
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if (network->gate(peer,verb(),packetId()))
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reportFlags |= ZT_CIRCUIT_TEST_REPORT_FLAGS_UPSTREAM_AUTHORIZED_IN_PATH;
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} else {
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TRACE("dropped CIRCUIT_TEST from %s(%s): originator %s did not specify a credential or credential type",source().toString().c_str(),_path->address().toString().c_str(),originatorAddress.toString().c_str());
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peer->received(_path,hops(),packetId(),Packet::VERB_CIRCUIT_TEST,0,Packet::VERB_NOP,false);
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@ -1188,7 +1217,7 @@ bool IncomingPacket::_doCIRCUIT_TEST(const RuntimeEnvironment *RR,const SharedPt
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outp.append((uint16_t)ZT_PLATFORM_UNSPECIFIED);
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outp.append((uint16_t)ZT_ARCHITECTURE_UNSPECIFIED);
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outp.append((uint16_t)0); // error code, currently unused
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outp.append((uint64_t)0); // flags, currently unused
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outp.append((uint64_t)reportFlags);
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outp.append((uint64_t)packetId());
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peer->address().appendTo(outp);
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outp.append((uint8_t)hops());
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@ -1237,7 +1266,6 @@ bool IncomingPacket::_doCIRCUIT_TEST_REPORT(const RuntimeEnvironment *RR,const S
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report.upstream = Address(field(ZT_PACKET_IDX_PAYLOAD + 52,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH).toInt();
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report.testId = at<uint64_t>(ZT_PACKET_IDX_PAYLOAD + 8);
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report.timestamp = at<uint64_t>(ZT_PACKET_IDX_PAYLOAD);
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report.remoteTimestamp = at<uint64_t>(ZT_PACKET_IDX_PAYLOAD + 16);
|
||||
report.sourcePacketId = at<uint64_t>(ZT_PACKET_IDX_PAYLOAD + 44);
|
||||
report.flags = at<uint64_t>(ZT_PACKET_IDX_PAYLOAD + 36);
|
||||
report.sourcePacketHopCount = (*this)[ZT_PACKET_IDX_PAYLOAD + 57]; // end of fixed length headers: 58
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue