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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2019 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/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#ifndef ZT_REVOCATION_HPP
#define ZT_REVOCATION_HPP
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "Constants.hpp"
#include "../include/ZeroTierOne.h"
#include "Credential.hpp"
#include "Address.hpp"
#include "C25519.hpp"
#include "Utils.hpp"
#include "Buffer.hpp"
#include "Identity.hpp"
/**
* Flag: fast propagation via rumor mill algorithm
*/
#define ZT_REVOCATION_FLAG_FAST_PROPAGATE 0x1ULL
namespace ZeroTier {
class RuntimeEnvironment;
/**
* Revocation certificate to instantaneously revoke a COM, capability, or tag
*/
class Revocation : public Credential
{
public:
static inline Credential::Type credentialType() { return Credential::CREDENTIAL_TYPE_REVOCATION; }
Revocation() :
_id(0),
_credentialId(0),
_networkId(0),
_threshold(0),
_flags(0),
_target(),
_signedBy(),
_type(Credential::CREDENTIAL_TYPE_NULL)
{
memset(_signature.data,0,sizeof(_signature.data));
}
/**
* @param i ID (arbitrary for revocations, currently random)
* @param nwid Network ID
* @param cid Credential ID being revoked (0 for all or for COMs, which lack IDs)
* @param thr Revocation time threshold before which credentials will be revoked
* @param fl Flags
* @param tgt Target node whose credential(s) are being revoked
* @param ct Credential type being revoked
*/
Revocation(const uint32_t i,const uint64_t nwid,const uint32_t cid,const uint64_t thr,const uint64_t fl,const Address &tgt,const Credential::Type ct) :
_id(i),
_credentialId(cid),
_networkId(nwid),
_threshold(thr),
_flags(fl),
_target(tgt),
_signedBy(),
_type(ct)
{
memset(_signature.data,0,sizeof(_signature.data));
}
inline uint32_t id() const { return _id; }
inline uint32_t credentialId() const { return _credentialId; }
inline uint64_t networkId() const { return _networkId; }
inline int64_t threshold() const { return _threshold; }
inline const Address &target() const { return _target; }
inline const Address &signer() const { return _signedBy; }
inline Credential::Type type() const { return _type; }
inline bool fastPropagate() const { return ((_flags & ZT_REVOCATION_FLAG_FAST_PROPAGATE) != 0); }
/**
* @param signer Signing identity, must have private key
* @return True if signature was successful
*/
inline bool sign(const Identity &signer)
{
if (signer.hasPrivate()) {
Buffer<sizeof(Revocation) + 64> tmp;
_signedBy = signer.address();
this->serialize(tmp,true);
_signature = signer.sign(tmp.data(),tmp.size());
return true;
}
return false;
}
/**
* Verify this revocation's signature
*
* @param RR Runtime environment to provide for peer lookup, etc.
* @param tPtr Thread pointer to be handed through to any callbacks called as a result of this call
* @return 0 == OK, 1 == waiting for WHOIS, -1 == BAD signature or chain
*/
int verify(const RuntimeEnvironment *RR,void *tPtr) const;
template<unsigned int C>
inline void serialize(Buffer<C> &b,const bool forSign = false) const
{
if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
b.append((uint32_t)0); // 4 unused bytes, currently set to 0
b.append(_id);
b.append(_networkId);
b.append((uint32_t)0); // 4 unused bytes, currently set to 0
b.append(_credentialId);
b.append(_threshold);
b.append(_flags);
_target.appendTo(b);
_signedBy.appendTo(b);
b.append((uint8_t)_type);
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);
}
// This is the size of any additional fields, currently 0.
b.append((uint16_t)0);
if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
}
template<unsigned int C>
inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
{
*this = Revocation();
unsigned int p = startAt;
p += 4; // 4 bytes, currently unused
_id = b.template at<uint32_t>(p); p += 4;
_networkId = b.template at<uint64_t>(p); p += 8;
p += 4; // 4 bytes, currently unused
_credentialId = b.template at<uint32_t>(p); p += 4;
_threshold = b.template at<uint64_t>(p); p += 8;
_flags = b.template at<uint64_t>(p); p += 8;
_target.setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH); p += ZT_ADDRESS_LENGTH;
_signedBy.setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH); p += ZT_ADDRESS_LENGTH;
_type = (Credential::Type)b[p++];
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 ZT_EXCEPTION_INVALID_SERIALIZED_DATA_INVALID_CRYPTOGRAPHIC_TOKEN;
} else {
p += 2 + b.template at<uint16_t>(p);
}
p += 2 + b.template at<uint16_t>(p);
if (p > b.size())
throw ZT_EXCEPTION_INVALID_SERIALIZED_DATA_OVERFLOW;
return (p - startAt);
}
private:
uint32_t _id;
uint32_t _credentialId;
uint64_t _networkId;
int64_t _threshold;
uint64_t _flags;
Address _target;
Address _signedBy;
Credential::Type _type;
C25519::Signature _signature;
};
} // namespace ZeroTier
#endif
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