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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#include "Membership.hpp"
#include "RuntimeEnvironment.hpp"
#include "Peer.hpp"
#include "Topology.hpp"
#include "Switch.hpp"
#include "Packet.hpp"
#include "Node.hpp"
#define ZT_CREDENTIAL_PUSH_EVERY (ZT_NETWORK_AUTOCONF_DELAY / 3)
namespace ZeroTier {
Membership::Membership() :
_lastUpdatedMulticast(0),
_lastPushedCom(0),
_comRevocationThreshold(0),
_revocations(4),
_remoteTags(4),
_remoteCaps(4),
_remoteCoos(4)
{
resetPushState();
}
void Membership::pushCredentials(const RuntimeEnvironment *RR,void *tPtr,const uint64_t now,const Address &peerAddress,const NetworkConfig &nconf,int localCapabilityIndex,const bool force)
{
bool sendCom = ( (nconf.com) && ( ((now - _lastPushedCom) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) ) );
const Capability *sendCap;
if (localCapabilityIndex >= 0) {
sendCap = &(nconf.capabilities[localCapabilityIndex]);
if ( ((now - _localCredLastPushed.cap[localCapabilityIndex]) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) )
_localCredLastPushed.cap[localCapabilityIndex] = now;
else sendCap = (const Capability *)0;
} else sendCap = (const Capability *)0;
const Tag *sendTags[ZT_MAX_NETWORK_TAGS];
unsigned int sendTagCount = 0;
for(unsigned int t=0;t<nconf.tagCount;++t) {
if ( ((now - _localCredLastPushed.tag[t]) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) ) {
_localCredLastPushed.tag[t] = now;
sendTags[sendTagCount++] = &(nconf.tags[t]);
}
}
const CertificateOfOwnership *sendCoos[ZT_MAX_CERTIFICATES_OF_OWNERSHIP];
unsigned int sendCooCount = 0;
for(unsigned int c=0;c<nconf.certificateOfOwnershipCount;++c) {
if ( ((now - _localCredLastPushed.coo[c]) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) ) {
_localCredLastPushed.coo[c] = now;
sendCoos[sendCooCount++] = &(nconf.certificatesOfOwnership[c]);
}
}
unsigned int tagPtr = 0;
unsigned int cooPtr = 0;
while ((tagPtr < sendTagCount)||(cooPtr < sendCooCount)||(sendCom)||(sendCap)) {
Packet outp(peerAddress,RR->identity.address(),Packet::VERB_NETWORK_CREDENTIALS);
if (sendCom) {
sendCom = false;
nconf.com.serialize(outp);
_lastPushedCom = now;
}
outp.append((uint8_t)0x00);
if (sendCap) {
outp.append((uint16_t)1);
sendCap->serialize(outp);
sendCap = (const Capability *)0;
} else outp.append((uint16_t)0);
const unsigned int tagCountAt = outp.size();
outp.addSize(2);
unsigned int thisPacketTagCount = 0;
while ((tagPtr < sendTagCount)&&((outp.size() + sizeof(Tag) + 16) < ZT_PROTO_MAX_PACKET_LENGTH)) {
sendTags[tagPtr++]->serialize(outp);
++thisPacketTagCount;
}
outp.setAt(tagCountAt,(uint16_t)thisPacketTagCount);
// No revocations, these propagate differently
outp.append((uint16_t)0);
const unsigned int cooCountAt = outp.size();
outp.addSize(2);
unsigned int thisPacketCooCount = 0;
while ((cooPtr < sendCooCount)&&((outp.size() + sizeof(CertificateOfOwnership) + 16) < ZT_PROTO_MAX_PACKET_LENGTH)) {
sendCoos[cooPtr++]->serialize(outp);
++thisPacketCooCount;
}
outp.setAt(cooCountAt,(uint16_t)thisPacketCooCount);
outp.compress();
RR->sw->send(tPtr,outp,true);
}
}
Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const CertificateOfMembership &com)
{
const uint64_t newts = com.timestamp();
if (newts <= _comRevocationThreshold) {
TRACE("addCredential(CertificateOfMembership) for %s on %.16llx REJECTED (revoked)",com.issuedTo().toString().c_str(),com.networkId());
return ADD_REJECTED;
}
const uint64_t oldts = _com.timestamp();
if (newts < oldts) {
TRACE("addCredential(CertificateOfMembership) for %s on %.16llx REJECTED (older than current)",com.issuedTo().toString().c_str(),com.networkId());
return ADD_REJECTED;
}
if ((newts == oldts)&&(_com == com)) {
TRACE("addCredential(CertificateOfMembership) for %s on %.16llx ACCEPTED (redundant)",com.issuedTo().toString().c_str(),com.networkId());
return ADD_ACCEPTED_REDUNDANT;
}
switch(com.verify(RR,tPtr)) {
default:
TRACE("addCredential(CertificateOfMembership) for %s on %.16llx REJECTED (invalid signature or object)",com.issuedTo().toString().c_str(),com.networkId());
return ADD_REJECTED;
case 0:
TRACE("addCredential(CertificateOfMembership) for %s on %.16llx ACCEPTED (new)",com.issuedTo().toString().c_str(),com.networkId());
_com = com;
return ADD_ACCEPTED_NEW;
case 1:
return ADD_DEFERRED_FOR_WHOIS;
}
}
// Template out addCredential() for many cred types to avoid copypasta
template<typename C>
static Membership::AddCredentialResult _addCredImpl(Hashtable<uint32_t,C> &remoteCreds,const Hashtable<uint64_t,uint64_t> &revocations,const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const C &cred)
{
C *rc = remoteCreds.get(cred.id());
if (rc) {
if (rc->timestamp() > cred.timestamp()) {
TRACE("addCredential(type==%d) for %s on %.16llx REJECTED (older than credential we have)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
return Membership::ADD_REJECTED;
}
if (*rc == cred) {
TRACE("addCredential(type==%d) for %s on %.16llx ACCEPTED (redundant)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
return Membership::ADD_ACCEPTED_REDUNDANT;
}
}
const uint64_t *const rt = revocations.get(Membership::credentialKey(C::credentialType(),cred.id()));
if ((rt)&&(*rt >= cred.timestamp())) {
TRACE("addCredential(type==%d) for %s on %.16llx REJECTED (timestamp below revocation threshold)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
return Membership::ADD_REJECTED;
}
switch(cred.verify(RR,tPtr)) {
default:
TRACE("addCredential(type==%d) for %s on %.16llx REJECTED (invalid)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
return Membership::ADD_REJECTED;
case 0:
TRACE("addCredential(type==%d) for %s on %.16llx ACCEPTED (new)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
if (!rc)
rc = &(remoteCreds[cred.id()]);
*rc = cred;
return Membership::ADD_ACCEPTED_NEW;
case 1:
return Membership::ADD_DEFERRED_FOR_WHOIS;
}
}
Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Tag &tag) { return _addCredImpl<Tag>(_remoteTags,_revocations,RR,tPtr,nconf,tag); }
Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Capability &cap) { return _addCredImpl<Capability>(_remoteCaps,_revocations,RR,tPtr,nconf,cap); }
Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const CertificateOfOwnership &coo) { return _addCredImpl<CertificateOfOwnership>(_remoteCoos,_revocations,RR,tPtr,nconf,coo); }
Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Revocation &rev)
{
uint64_t *rt;
switch(rev.verify(RR,tPtr)) {
default:
return ADD_REJECTED;
case 0: {
const Credential::Type ct = rev.type();
switch(ct) {
case Credential::CREDENTIAL_TYPE_COM:
if (rev.threshold() > _comRevocationThreshold) {
_comRevocationThreshold = rev.threshold();
return ADD_ACCEPTED_NEW;
}
return ADD_ACCEPTED_REDUNDANT;
case Credential::CREDENTIAL_TYPE_CAPABILITY:
case Credential::CREDENTIAL_TYPE_TAG:
case Credential::CREDENTIAL_TYPE_COO:
rt = &(_revocations[credentialKey(ct,rev.credentialId())]);
if (*rt < rev.threshold()) {
*rt = rev.threshold();
return ADD_ACCEPTED_NEW;
}
return ADD_ACCEPTED_REDUNDANT;
default:
return ADD_REJECTED;
}
}
case 1:
return ADD_DEFERRED_FOR_WHOIS;
}
}
void Membership::clean(const uint64_t now,const NetworkConfig &nconf)
{
_cleanCredImpl<Tag>(nconf,_remoteTags);
_cleanCredImpl<Capability>(nconf,_remoteCaps);
_cleanCredImpl<CertificateOfOwnership>(nconf,_remoteCoos);
}
} // namespace ZeroTier
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