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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/>.
*/
#include <algorithm>
#include "CertificateOfMembership.hpp"
namespace ZeroTier {
void CertificateOfMembership::setQualifier(uint64_t id,uint64_t value,uint64_t maxDelta)
{
_signedBy.zero();
for(std::vector<_Qualifier>::iterator q(_qualifiers.begin());q!=_qualifiers.end();++q) {
if (q->id == id) {
q->value = value;
q->maxDelta = maxDelta;
return;
}
}
_qualifiers.push_back(_Qualifier(id,value,maxDelta));
std::sort(_qualifiers.begin(),_qualifiers.end());
}
std::string CertificateOfMembership::toString() const
{
std::string s;
s.append("1:"); // COM_UINT64_ED25519
uint64_t *buf = new uint64_t[_qualifiers.size() * 3];
try {
unsigned int ptr = 0;
for(std::vector<_Qualifier>::const_iterator q(_qualifiers.begin());q!=_qualifiers.end();++q) {
buf[ptr++] = Utils::hton(q->id);
buf[ptr++] = Utils::hton(q->value);
buf[ptr++] = Utils::hton(q->maxDelta);
}
s.append(Utils::hex(buf,ptr * sizeof(uint64_t)));
delete [] buf;
} catch ( ... ) {
delete [] buf;
throw;
}
s.push_back(':');
s.append(_signedBy.toString());
if (_signedBy) {
s.push_back(':');
s.append(Utils::hex(_signature.data,(unsigned int)_signature.size()));
}
return s;
}
void CertificateOfMembership::fromString(const char *s)
{
_qualifiers.clear();
_signedBy.zero();
memset(_signature.data,0,_signature.size());
if (!*s)
return;
unsigned int colonAt = 0;
while ((s[colonAt])&&(s[colonAt] != ':')) ++colonAt;
if (!((colonAt == 1)&&(s[0] == '1'))) // COM_UINT64_ED25519?
return;
s += colonAt + 1;
colonAt = 0;
while ((s[colonAt])&&(s[colonAt] != ':')) ++colonAt;
if (colonAt) {
unsigned int buflen = colonAt / 2;
char *buf = new char[buflen];
unsigned int bufactual = Utils::unhex(s,colonAt,buf,buflen);
char *bufptr = buf;
try {
while (bufactual >= 24) {
_qualifiers.push_back(_Qualifier());
_qualifiers.back().id = Utils::ntoh(*((uint64_t *)bufptr)); bufptr += 8;
_qualifiers.back().value = Utils::ntoh(*((uint64_t *)bufptr)); bufptr += 8;
_qualifiers.back().maxDelta = Utils::ntoh(*((uint64_t *)bufptr)); bufptr += 8;
bufactual -= 24;
}
} catch ( ... ) {}
delete [] buf;
}
if (s[colonAt]) {
s += colonAt + 1;
colonAt = 0;
while ((s[colonAt])&&(s[colonAt] != ':')) ++colonAt;
if (colonAt) {
char addrbuf[ZT_ADDRESS_LENGTH];
if (Utils::unhex(s,colonAt,addrbuf,sizeof(addrbuf)) == ZT_ADDRESS_LENGTH)
_signedBy.setTo(addrbuf,ZT_ADDRESS_LENGTH);
if ((_signedBy)&&(s[colonAt])) {
s += colonAt + 1;
colonAt = 0;
while ((s[colonAt])&&(s[colonAt] != ':')) ++colonAt;
if (colonAt) {
if (Utils::unhex(s,colonAt,_signature.data,(unsigned int)_signature.size()) != _signature.size())
_signedBy.zero();
} else _signedBy.zero();
} else _signedBy.zero();
}
}
std::sort(_qualifiers.begin(),_qualifiers.end());
_qualifiers.erase(std::unique(_qualifiers.begin(),_qualifiers.end()),_qualifiers.end());
}
bool CertificateOfMembership::agreesWith(const CertificateOfMembership &other) const
throw()
{
unsigned long myidx = 0;
unsigned long otheridx = 0;
while (myidx < _qualifiers.size()) {
// Fail if we're at the end of other, since this means the field is
// missing.
if (otheridx >= other._qualifiers.size())
return false;
// Seek to corresponding tuple in other, ignoring tuples that
// we may not have. If we run off the end of other, the tuple is
// missing. This works because tuples are sorted by ID.
while (other._qualifiers[otheridx].id != _qualifiers[myidx].id) {
++otheridx;
if (otheridx >= other._qualifiers.size())
return false;
}
// Compare to determine if the absolute value of the difference
// between these two parameters is within our maxDelta.
const uint64_t a = _qualifiers[myidx].value;
const uint64_t b = other._qualifiers[myidx].value;
if (((a >= b) ? (a - b) : (b - a)) > _qualifiers[myidx].maxDelta)
return false;
++myidx;
}
return true;
}
bool CertificateOfMembership::sign(const Identity &with)
{
uint64_t *buf = new uint64_t[_qualifiers.size() * 3];
unsigned int ptr = 0;
for(std::vector<_Qualifier>::const_iterator q(_qualifiers.begin());q!=_qualifiers.end();++q) {
buf[ptr++] = Utils::hton(q->id);
buf[ptr++] = Utils::hton(q->value);
buf[ptr++] = Utils::hton(q->maxDelta);
}
try {
_signature = with.sign(buf,ptr * sizeof(uint64_t));
_signedBy = with.address();
delete [] buf;
return true;
} catch ( ... ) {
_signedBy.zero();
delete [] buf;
return false;
}
}
bool CertificateOfMembership::verify(const Identity &id) const
{
if (!_signedBy)
return false;
if (id.address() != _signedBy)
return false;
uint64_t *buf = new uint64_t[_qualifiers.size() * 3];
unsigned int ptr = 0;
for(std::vector<_Qualifier>::const_iterator q(_qualifiers.begin());q!=_qualifiers.end();++q) {
buf[ptr++] = Utils::hton(q->id);
buf[ptr++] = Utils::hton(q->value);
buf[ptr++] = Utils::hton(q->maxDelta);
}
bool valid = false;
try {
valid = id.verify(buf,ptr * sizeof(uint64_t),_signature);
delete [] buf;
} catch ( ... ) {
delete [] buf;
}
return valid;
}
} // namespace ZeroTier
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