mirror of
https://github.com/zerotier/ZeroTierOne.git
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131 lines
4.1 KiB
C++
131 lines
4.1 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2025-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#include "CertificateOfMembership.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Topology.hpp"
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#include "Switch.hpp"
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#include "Network.hpp"
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#include "Node.hpp"
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namespace ZeroTier {
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CertificateOfMembership::CertificateOfMembership(uint64_t timestamp,uint64_t timestampMaxDelta,uint64_t nwid,const Identity &issuedTo)
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{
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_qualifiers[0].id = COM_RESERVED_ID_TIMESTAMP;
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_qualifiers[0].value = timestamp;
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_qualifiers[0].maxDelta = timestampMaxDelta;
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_qualifiers[1].id = COM_RESERVED_ID_NETWORK_ID;
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_qualifiers[1].value = nwid;
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_qualifiers[1].maxDelta = 0;
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_qualifiers[2].id = COM_RESERVED_ID_ISSUED_TO;
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_qualifiers[2].value = issuedTo.address().toInt();
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_qualifiers[2].maxDelta = 0xffffffffffffffffULL;
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// Include hash of full identity public key in COM for hardening purposes. Pack it in
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// using the original COM format. Format may be revised in the future to make this cleaner.
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uint64_t idHash[6];
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issuedTo.publicKeyHash(idHash);
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for(unsigned long i=0;i<4;++i) {
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_qualifiers[i + 3].id = (uint64_t)(i + 3);
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_qualifiers[i + 3].value = Utils::ntoh(idHash[i]);
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_qualifiers[i + 3].maxDelta = 0xffffffffffffffffULL;
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}
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_qualifierCount = 7;
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memset(_signature.data,0,ZT_C25519_SIGNATURE_LEN);
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}
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bool CertificateOfMembership::agreesWith(const CertificateOfMembership &other, const Identity &otherIdentity) const
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{
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if ((_qualifierCount == 0)||(other._qualifierCount == 0))
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return false;
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std::map< uint64_t, uint64_t > otherFields;
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for(unsigned int i=0;i<other._qualifierCount;++i)
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otherFields[other._qualifiers[i].id] = other._qualifiers[i].value;
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bool fullIdentityVerification = false;
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for(unsigned int i=0;i<_qualifierCount;++i) {
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const uint64_t qid = _qualifiers[i].id;
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if ((qid >= 3)&&(qid <= 6))
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fullIdentityVerification = true;
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std::map< uint64_t, uint64_t >::iterator otherQ(otherFields.find(qid));
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if (otherQ == otherFields.end())
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return false;
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const uint64_t a = _qualifiers[i].value;
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const uint64_t b = otherQ->second;
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if (((a >= b) ? (a - b) : (b - a)) > _qualifiers[i].maxDelta)
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return false;
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}
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// If this COM has a full hash of its identity, assume the other must have this as well.
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// Otherwise we are on a controller that does not incorporate these.
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if (fullIdentityVerification) {
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uint64_t idHash[6];
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otherIdentity.publicKeyHash(idHash);
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for(unsigned long i=0;i<4;++i) {
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std::map< uint64_t, uint64_t >::iterator otherQ(otherFields.find((uint64_t)(i + 3)));
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if (otherQ == otherFields.end())
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return false;
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if (otherQ->second != Utils::ntoh(idHash[i]))
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return false;
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}
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}
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return true;
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}
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bool CertificateOfMembership::sign(const Identity &with)
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{
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uint64_t buf[ZT_NETWORK_COM_MAX_QUALIFIERS * 3];
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unsigned int ptr = 0;
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for(unsigned int i=0;i<_qualifierCount;++i) {
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buf[ptr++] = Utils::hton(_qualifiers[i].id);
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buf[ptr++] = Utils::hton(_qualifiers[i].value);
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buf[ptr++] = Utils::hton(_qualifiers[i].maxDelta);
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}
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try {
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_signature = with.sign(buf,ptr * sizeof(uint64_t));
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_signedBy = with.address();
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return true;
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} catch ( ... ) {
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_signedBy.zero();
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return false;
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}
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}
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int CertificateOfMembership::verify(const RuntimeEnvironment *RR,void *tPtr) const
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{
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if ((!_signedBy)||(_signedBy != Network::controllerFor(networkId()))||(_qualifierCount > ZT_NETWORK_COM_MAX_QUALIFIERS))
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return -1;
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const Identity id(RR->topology->getIdentity(tPtr,_signedBy));
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if (!id) {
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RR->sw->requestWhois(tPtr,RR->node->now(),_signedBy);
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return 1;
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}
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uint64_t buf[ZT_NETWORK_COM_MAX_QUALIFIERS * 3];
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unsigned int ptr = 0;
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for(unsigned int i=0;i<_qualifierCount;++i) {
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buf[ptr++] = Utils::hton(_qualifiers[i].id);
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buf[ptr++] = Utils::hton(_qualifiers[i].value);
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buf[ptr++] = Utils::hton(_qualifiers[i].maxDelta);
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}
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return (id.verify(buf,ptr * sizeof(uint64_t),_signature) ? 0 : -1);
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}
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} // namespace ZeroTier
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