Flesh out membership certificate with signature, better serialize/deserialize, and rename parameter to qualifier to make better conceptual sense.

This commit is contained in:
Adam Ierymenko 2013-10-04 12:24:21 -04:00
parent ca6c0fad08
commit ea4e1136dd
6 changed files with 314 additions and 69 deletions

View file

@ -30,6 +30,9 @@
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <utility>
#include "Constants.hpp"
#include "RuntimeEnvironment.hpp"
#include "NodeConfig.hpp"
@ -40,73 +43,135 @@
namespace ZeroTier {
void Network::CertificateOfMembership::addParameter(uint64_t id,uint64_t value,uint64_t maxDelta)
void Network::CertificateOfMembership::setQualifier(uint64_t id,uint64_t value,uint64_t maxDelta)
{
_params.push_back(_Parameter(id,value,maxDelta));
std::sort(_params.begin(),_params.end(),_SortByIdComparison());
_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 Network::CertificateOfMembership::toString() const
{
uint64_t tmp[3000];
unsigned long n = 0;
for(std::vector<_Parameter>::const_iterator p(_params.begin());p!=_params.end();++p) {
tmp[n++] = Utils::hton(p->id);
tmp[n++] = Utils::hton(p->value);
tmp[n++] = Utils::hton(p->maxDelta);
if (n >= 3000)
break; // sanity check -- certificates will never even approach this size
std::string s;
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;
}
return Utils::hex(tmp,sizeof(uint64_t) * n);
s.push_back(':');
s.append(_signedBy.toString());
if (_signedBy) {
s.push_back(':');
s.append(Utils::hex(_signature.data,_signature.size()));
}
return s;
}
void Network::CertificateOfMembership::fromString(const char *s)
{
std::string tmp(Utils::unhex(s));
_params.clear();
const char *ptr = tmp.data();
unsigned long remaining = tmp.length();
while (remaining >= 24) {
_Parameter p;
p.id = Utils::ntoh(*((const uint64_t *)(ptr)));
p.value = Utils::ntoh(*((const uint64_t *)(ptr + 8)));
p.maxDelta = Utils::ntoh(*((const uint64_t *)(ptr + 16)));
_params.push_back(p);
ptr += 24;
remaining -= 24;
_qualifiers.clear();
_signedBy.zero();
unsigned int 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,_signature.size()) != _signature.size())
_signedBy.zero();
} else _signedBy.zero();
} else _signedBy.zero();
}
}
std::sort(_qualifiers.begin(),_qualifiers.end());
std::unique(_qualifiers.begin(),_qualifiers.end());
}
bool Network::CertificateOfMembership::compare(const CertificateOfMembership &other) const
bool Network::CertificateOfMembership::agreesWith(const CertificateOfMembership &other) const
throw()
{
unsigned long myidx = 0;
unsigned long otheridx = 0;
while (myidx < _params.size()) {
while (myidx < _qualifiers.size()) {
// Fail if we're at the end of other, since this means the field is
// missing.
if (otheridx >= other._params.size())
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._params[otheridx].id != _params[myidx].id) {
while (other._qualifiers[otheridx].id != _qualifiers[myidx].id) {
++otheridx;
if (otheridx >= other._params.size())
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.
uint64_t a = _params[myidx].value;
uint64_t b = other._params[myidx].value;
uint64_t a = _qualifiers[myidx].value;
uint64_t b = other._qualifiers[myidx].value;
if (a >= b) {
if ((a - b) > _params[myidx].maxDelta)
if ((a - b) > _qualifiers[myidx].maxDelta)
return false;
} else {
if ((b - a) > _params[myidx].maxDelta)
if ((b - a) > _qualifiers[myidx].maxDelta)
return false;
}
@ -116,6 +181,55 @@ bool Network::CertificateOfMembership::compare(const CertificateOfMembership &ot
return true;
}
bool Network::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 Network::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;
}
// ---------------------------------------------------------------------------
const Network::MulticastRates::Rate Network::MulticastRates::GLOBAL_DEFAULT_RATE(65535,65535,64);
const char *Network::statusString(const Status s)
@ -253,7 +367,7 @@ bool Network::isAllowed(const Address &peer) const
std::map<Address,CertificateOfMembership>::const_iterator pc(_membershipCertificates.find(peer));
if (pc == _membershipCertificates.end())
return false;
return _myCertificate.compare(pc->second);
return _myCertificate.agreesWith(pc->second);
} catch (std::exception &exc) {
TRACE("isAllowed() check failed for peer %s: unexpected exception: %s",peer.toString().c_str(),exc.what());
} catch ( ... ) {
@ -282,7 +396,7 @@ void Network::clean()
}
for(std::map<Address,CertificateOfMembership>::iterator i=(_membershipCertificates.begin());i!=_membershipCertificates.end();) {
if (_myCertificate.compare(i->second)) {
if (_myCertificate.agreesWith(i->second)) {
if ((!writeError)&&(mcdb)) {
char tmp[ZT_ADDRESS_LENGTH];
i->first.copyTo(tmp,ZT_ADDRESS_LENGTH);