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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/>.
*/
#ifndef ZT_CERTIFICATEOFREPRESENTATION_HPP
#define ZT_CERTIFICATEOFREPRESENTATION_HPP
#include "Constants.hpp"
#include "Address.hpp"
#include "C25519.hpp"
#include "Identity.hpp"
#include "Buffer.hpp"
/**
* Maximum number of addresses allowed in a COR
*/
#define ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES ZT_MAX_UPSTREAMS
namespace ZeroTier {
class CertificateOfRepresentation
{
public:
CertificateOfRepresentation()
{
memset(this,0,sizeof(CertificateOfRepresentation));
}
inline uint64_t timestamp() const { return _timestamp; }
inline const Address &representative(const unsigned int i) const { return _reps[i]; }
inline unsigned int repCount() const { return _repCount; }
inline void clear()
{
memset(this,0,sizeof(CertificateOfRepresentation));
}
/**
* Add a representative if space remains
*
* @param r Representative to add
* @return True if representative was added
*/
inline bool addRepresentative(const Address &r)
{
if (_repCount < ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES) {
_reps[_repCount++] = r;
return true;
}
return false;
}
/**
* Sign this COR with my identity
*
* @param myIdentity This node's identity
* @param ts COR timestamp for establishing new vs. old
*/
inline void sign(const Identity &myIdentity,const uint64_t ts)
{
_timestamp = ts;
Buffer<sizeof(CertificateOfRepresentation) + 32> tmp;
this->serialize(tmp,true);
_signature = myIdentity.sign(tmp.data(),tmp.size());
}
/**
* Verify this COR's signature
*
* @param senderIdentity Identity of sender of COR
* @return True if COR is valid
*/
inline bool verify(const Identity &senderIdentity)
{
try {
Buffer<sizeof(CertificateOfRepresentation) + 32> tmp;
this->serialize(tmp,true);
return senderIdentity.verify(tmp.data(),tmp.size(),_signature.data,ZT_C25519_SIGNATURE_LEN);
} catch ( ... ) {
return false;
}
}
template<unsigned int C>
inline void serialize(Buffer<C> &b,const bool forSign = false) const
{
if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
b.append((uint64_t)_timestamp);
b.append((uint16_t)_repCount);
for(unsigned int i=0;i<_repCount;++i)
_reps[i].appendTo(b);
if (!forSign) {
b.append((uint8_t)1); // 1 == Ed25519 signature
b.append((uint16_t)ZT_C25519_SIGNATURE_LEN);
b.append(_signature.data,ZT_C25519_SIGNATURE_LEN);
}
b.append((uint16_t)0); // size of any additional fields, currently 0
if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
}
template<unsigned int C>
inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
{
clear();
unsigned int p = startAt;
_timestamp = b.template at<uint64_t>(p); p += 8;
const unsigned int rc = b.template at<uint16_t>(p); p += 2;
for(unsigned int i=0;i<rc;++i) {
if (i < ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES)
_reps[i].setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
p += ZT_ADDRESS_LENGTH;
}
_repCount = (rc > ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES) ? ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES : rc;
if (b[p++] == 1) {
if (b.template at<uint16_t>(p) == ZT_C25519_SIGNATURE_LEN) {
p += 2;
memcpy(_signature.data,b.field(p,ZT_C25519_SIGNATURE_LEN),ZT_C25519_SIGNATURE_LEN);
p += ZT_C25519_SIGNATURE_LEN;
} else throw std::runtime_error("invalid signature");
} else {
p += 2 + b.template at<uint16_t>(p);
}
p += 2 + b.template at<uint16_t>(p);
if (p > b.size())
throw std::runtime_error("extended field overflow");
return (p - startAt);
}
private:
uint64_t _timestamp;
Address _reps[ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES];
unsigned int _repCount;
C25519::Signature _signature;
};
} // namespace ZeroTier
#endif
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