Certificate of ownership -- used to secure against IP address spoofing, especially for IPv4 and regular IPv6.
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Adam Ierymenko
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33b94e8478
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10185e92fa
15 changed files with 553 additions and 97 deletions
251
node/CertificateOfOwnership.hpp
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251
node/CertificateOfOwnership.hpp
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/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZT_CERTIFICATEOFOWNERSHIP_HPP
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#define ZT_CERTIFICATEOFOWNERSHIP_HPP
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "Constants.hpp"
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#include "C25519.hpp"
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#include "Address.hpp"
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#include "Identity.hpp"
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#include "Buffer.hpp"
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#include "InetAddress.hpp"
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#include "MAC.hpp"
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// Max things per CertificateOfOwnership
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#define ZT_CERTIFICATEOFOWNERSHIP_MAX_THINGS 16
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// Maximum size of a thing's value field in bytes
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#define ZT_CERTIFICATEOFOWNERSHIP_MAX_THING_VALUE_SIZE 16
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namespace ZeroTier {
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class RuntimeEnvironment;
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/**
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* Certificate indicating ownership of a network identifier
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*/
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class CertificateOfOwnership
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{
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public:
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enum Thing
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{
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THING_NULL = 0,
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THING_MAC_ADDRESS = 1,
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THING_IPV4_ADDRESS = 2,
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THING_IPV6_ADDRESS = 3
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};
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CertificateOfOwnership() :
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_networkId(0),
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_ts(0),
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_id(0),
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_thingCount(0)
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{
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}
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CertificateOfOwnership(const uint64_t nwid,const uint64_t ts,const Address &issuedTo,const uint32_t id) :
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_networkId(nwid),
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_ts(ts),
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_flags(0),
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_id(id),
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_thingCount(0),
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_issuedTo(issuedTo)
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{
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}
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inline uint64_t networkId() const { return _networkId; }
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inline uint64_t timestamp() const { return _ts; }
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inline uint32_t id() const { return _id; }
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inline unsigned int thingCount() const { return (unsigned int)_thingCount; }
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inline Thing thingType(const unsigned int i) const { return (Thing)_thingTypes[i]; }
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inline const uint8_t *thingValue(const unsigned int i) const { return _thingValues[i]; }
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inline const Address &issuedTo() const { return _issuedTo; }
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inline bool owns(const Thing &t,const void *v,unsigned int l)
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{
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for(unsigned int i=0,j=_thingCount;i<j;++i) {
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if (_thingTypes[i] == (uint8_t)t) {
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unsigned int k = 0;
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while (k < l) {
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if (reinterpret_cast<const uint8_t *>(v)[k] != _thingValues[i][k])
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break;
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++k;
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}
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if (k == l)
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return true;
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}
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}
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return false;
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}
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inline bool owns(const InetAddress &ip)
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{
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if (ip.ss_family == AF_INET)
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return this->owns(THING_IPV4_ADDRESS,&(reinterpret_cast<const struct sockaddr_in *>(&ip)->sin_addr.s_addr),4);
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if (ip.ss_family == AF_INET6)
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return this->owns(THING_IPV6_ADDRESS,reinterpret_cast<const struct sockaddr_in6 *>(&ip)->sin6_addr.s6_addr,16);
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return false;
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}
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inline bool owns(const MAC &mac)
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{
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uint8_t tmp[6];
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mac.copyTo(tmp,6);
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return this->owns(THING_MAC_ADDRESS,tmp,6);
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}
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inline void addThing(const InetAddress &ip)
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{
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if (_thingCount >= ZT_CERTIFICATEOFOWNERSHIP_MAX_THINGS) return;
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if (ip.ss_family == AF_INET) {
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_thingTypes[_thingCount] = THING_IPV4_ADDRESS;
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memcpy(_thingValues[_thingCount],&(reinterpret_cast<const struct sockaddr_in *>(&ip)->sin_addr.s_addr),4);
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++_thingCount;
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} else if (ip.ss_family == AF_INET6) {
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_thingTypes[_thingCount] = THING_IPV6_ADDRESS;
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memcpy(_thingValues[_thingCount],reinterpret_cast<const struct sockaddr_in6 *>(&ip)->sin6_addr.s6_addr,16);
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++_thingCount;
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}
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}
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inline void addThing(const MAC &mac)
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{
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if (_thingCount >= ZT_CERTIFICATEOFOWNERSHIP_MAX_THINGS) return;
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_thingTypes[_thingCount] = THING_MAC_ADDRESS;
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mac.copyTo(_thingValues[_thingCount],6);
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++_thingCount;
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}
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/**
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* @param signer Signing identity, must have private key
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* @return True if signature was successful
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*/
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inline bool sign(const Identity &signer)
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{
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if (signer.hasPrivate()) {
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Buffer<sizeof(CertificateOfOwnership) + 64> tmp;
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_signedBy = signer.address();
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this->serialize(tmp,true);
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_signature = signer.sign(tmp.data(),tmp.size());
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return true;
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}
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return false;
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}
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/**
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* @param RR Runtime environment to allow identity lookup for signedBy
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* @return 0 == OK, 1 == waiting for WHOIS, -1 == BAD signature
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*/
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int verify(const RuntimeEnvironment *RR) const;
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template<unsigned int C>
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inline void serialize(Buffer<C> &b,const bool forSign = false) const
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{
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if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
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b.append(_networkId);
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b.append(_ts);
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b.append(_flags);
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b.append(_id);
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b.append((uint16_t)_thingCount);
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for(unsigned int i=0,j=_thingCount;i<j;++i) {
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b.append((uint8_t)_thingTypes[i]);
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b.append(_thingValues[i],ZT_CERTIFICATEOFOWNERSHIP_MAX_THING_VALUE_SIZE);
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}
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_issuedTo.appendTo(b);
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_signedBy.appendTo(b);
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if (!forSign) {
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b.append((uint8_t)1); // 1 == Ed25519
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b.append((uint16_t)ZT_C25519_SIGNATURE_LEN); // length of signature
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b.append(_signature.data,ZT_C25519_SIGNATURE_LEN);
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}
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b.append((uint16_t)0); // length of additional fields, currently 0
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if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
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}
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template<unsigned int C>
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inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
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{
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unsigned int p = startAt;
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memset(this,0,sizeof(CertificateOfOwnership));
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_networkId = b.template at<uint64_t>(p); p += 8;
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_ts = b.template at<uint64_t>(p); p += 8;
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_flags = b.template at<uint64_t>(p); p += 8;
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_id = b.template at<uint32_t>(p); p += 4;
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_thingCount = b.template at<uint16_t>(p); p += 2;
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for(unsigned int i=0,j=_thingCount;i<j;++i) {
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if (i < ZT_CERTIFICATEOFOWNERSHIP_MAX_THINGS) {
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_thingTypes[i] = (uint8_t)b[p++];
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memcpy(_thingValues[i],b.field(p,ZT_CERTIFICATEOFOWNERSHIP_MAX_THING_VALUE_SIZE),ZT_CERTIFICATEOFOWNERSHIP_MAX_THING_VALUE_SIZE);
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p += ZT_CERTIFICATEOFOWNERSHIP_MAX_THING_VALUE_SIZE;
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}
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}
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_issuedTo.setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH); p += ZT_ADDRESS_LENGTH;
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_signedBy.setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH); p += ZT_ADDRESS_LENGTH;
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if (b[p++] == 1) {
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if (b.template at<uint16_t>(p) != ZT_C25519_SIGNATURE_LEN)
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throw std::runtime_error("invalid signature length");
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p += 2;
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memcpy(_signature.data,b.field(p,ZT_C25519_SIGNATURE_LEN),ZT_C25519_SIGNATURE_LEN); p += ZT_C25519_SIGNATURE_LEN;
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} else {
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p += 2 + b.template at<uint16_t>(p);
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}
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p += 2 + b.template at<uint16_t>(p);
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if (p > b.size())
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throw std::runtime_error("extended field overflow");
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return (p - startAt);
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}
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// Provides natural sort order by ID
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inline bool operator<(const CertificateOfOwnership &coo) const { return (_id < coo._id); }
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inline bool operator==(const CertificateOfOwnership &coo) const { return (memcmp(this,&coo,sizeof(CertificateOfOwnership)) == 0); }
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inline bool operator!=(const CertificateOfOwnership &coo) const { return (memcmp(this,&coo,sizeof(CertificateOfOwnership)) != 0); }
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private:
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uint64_t _networkId;
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uint64_t _ts;
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uint64_t _flags;
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uint32_t _id;
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uint16_t _thingCount;
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uint8_t _thingTypes[ZT_CERTIFICATEOFOWNERSHIP_MAX_THINGS];
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uint8_t _thingValues[ZT_CERTIFICATEOFOWNERSHIP_MAX_THINGS][ZT_CERTIFICATEOFOWNERSHIP_MAX_THING_VALUE_SIZE];
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Address _issuedTo;
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Address _signedBy;
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C25519::Signature _signature;
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};
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} // namespace ZeroTier
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#endif
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