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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_TAG_HPP
#define ZT_TAG_HPP
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Constants.hpp"
#include "C25519.hpp"
#include "Address.hpp"
#include "Identity.hpp"
#include "Buffer.hpp"
namespace ZeroTier {
class RuntimeEnvironment;
/**
* A tag that can be associated with members and matched in rules
*
* Capabilities group rules, while tags group members subject to those
* rules. Tag values can be matched in rules, and tags relevant to a
* capability are presented along with it.
*
* E.g. a capability might be "can speak Samba/CIFS within your
* department." This cap might have a rule to allow TCP/137 but
* only if a given tag ID's value matches between two peers. The
* capability is what members can do, while the tag is who they are.
* Different departments might have tags with the same ID but different
* values.
*
* Unlike capabilities tags are signed only by the issuer and are never
* transferrable.
*/
class Tag
{
public:
Tag()
{
memset(this,0,sizeof(Tag));
}
/**
* @param nwid Network ID
* @param ts Timestamp
* @param issuedTo Address to which this tag was issued
* @param id Tag ID
* @param value Tag value
*/
Tag(const uint64_t nwid,const uint64_t ts,const Address &issuedTo,const uint32_t id,const uint32_t value) :
_networkId(nwid),
_ts(ts),
_id(id),
_value(value),
_issuedTo(issuedTo),
_signedBy()
{
}
inline uint64_t networkId() const { return _networkId; }
inline uint64_t timestamp() const { return _ts; }
inline uint32_t id() const { return _id; }
inline const uint32_t &value() const { return _value; }
inline const Address &issuedTo() const { return _issuedTo; }
inline const Address &signedBy() const { return _signedBy; }
/**
* Sign this tag
*
* @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(Tag) + 64> tmp;
_signedBy = signer.address();
this->serialize(tmp,true);
_signature = signer.sign(tmp.data(),tmp.size());
return true;
}
return false;
}
/**
* Check this tag's signature
*
* @param RR Runtime environment to allow identity lookup for signedBy
* @return 0 == OK, 1 == waiting for WHOIS, -1 == BAD signature or tag
*/
int verify(const RuntimeEnvironment *RR) const;
template<unsigned int C>
inline void serialize(Buffer<C> &b,const bool forSign = false) const
{
if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
// These are the same between Tag and Capability
b.append(_networkId);
b.append(_ts);
b.append(_id);
b.append(_value);
_issuedTo.appendTo(b);
_signedBy.appendTo(b);
if (!forSign) {
b.append((uint8_t)1); // 1 == Ed25519
b.append((uint16_t)ZT_C25519_SIGNATURE_LEN); // length of signature
b.append(_signature.data,ZT_C25519_SIGNATURE_LEN);
}
b.append((uint16_t)0); // length of 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)
{
unsigned int p = startAt;
// These are the same between Tag and Capability
_networkId = b.template at<uint64_t>(p); p += 8;
_ts = b.template at<uint64_t>(p); p += 8;
_id = b.template at<uint32_t>(p); p += 4;
_value = b.template at<uint32_t>(p); p += 4;
_issuedTo.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;
if (b[p++] == 1) {
if (b.template at<uint16_t>(p) != ZT_C25519_SIGNATURE_LEN)
throw std::runtime_error("invalid signature length");
p += 2;
memcpy(_signature.data,b.field(p,ZT_C25519_SIGNATURE_LEN),ZT_C25519_SIGNATURE_LEN); p += ZT_C25519_SIGNATURE_LEN;
} 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);
}
// Provides natural sort order by ID
inline bool operator<(const Tag &t) const { return (_id < t._id); }
inline bool operator==(const Tag &t) const { return (memcmp(this,&t,sizeof(Tag)) == 0); }
inline bool operator!=(const Tag &t) const { return (memcmp(this,&t,sizeof(Tag)) != 0); }
// For searching sorted arrays or lists of Tags by ID
struct IdComparePredicate
{
inline bool operator()(const Tag &a,const Tag &b) const { return (a.id() < b.id()); }
inline bool operator()(const uint32_t a,const Tag &b) const { return (a < b.id()); }
inline bool operator()(const Tag &a,const uint32_t b) const { return (a.id() < b); }
inline bool operator()(const Tag *a,const Tag *b) const { return (a->id() < b->id()); }
inline bool operator()(const Tag *a,const Tag &b) const { return (a->id() < b.id()); }
inline bool operator()(const Tag &a,const Tag *b) const { return (a.id() < b->id()); }
inline bool operator()(const uint32_t a,const Tag *b) const { return (a < b->id()); }
inline bool operator()(const Tag *a,const uint32_t b) const { return (a->id() < b); }
inline bool operator()(const uint32_t a,const uint32_t b) const { return (a < b); }
};
private:
uint64_t _networkId;
uint64_t _ts;
uint32_t _id;
uint32_t _value;
Address _issuedTo;
Address _signedBy;
C25519::Signature _signature;
};
} // namespace ZeroTier
#endif
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