blob: 2e1e63787ed715683d8265429c1156c51502b1a3 [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2014 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library 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 Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
* @author Jeff Thompson <jefft0@remap.ucla.edu>
*/
#include "common.hpp"
#include "validator.hpp"
#include "../util/crypto.hpp"
#include "cryptopp.hpp"
namespace ndn {
static OID SECP256R1("1.2.840.10045.3.1.7");
static OID SECP384R1("1.3.132.0.34");
Validator::Validator(Face* face)
: m_face(face)
{
}
Validator::Validator(Face& face)
: m_face(&face)
{
}
void
Validator::validate(const Interest& interest,
const OnInterestValidated& onValidated,
const OnInterestValidationFailed& onValidationFailed,
int nSteps)
{
std::vector<shared_ptr<ValidationRequest> > nextSteps;
checkPolicy(interest, nSteps, onValidated, onValidationFailed, nextSteps);
if (nextSteps.empty())
{
// If there is no nextStep,
// that means InterestPolicy has already been able to verify the Interest.
// No more further processes.
return;
}
OnFailure onFailure = bind(onValidationFailed, interest.shared_from_this(), _1);
afterCheckPolicy(nextSteps, onFailure);
}
void
Validator::validate(const Data& data,
const OnDataValidated& onValidated,
const OnDataValidationFailed& onValidationFailed,
int nSteps)
{
std::vector<shared_ptr<ValidationRequest> > nextSteps;
checkPolicy(data, nSteps, onValidated, onValidationFailed, nextSteps);
if (nextSteps.empty())
{
// If there is no nextStep,
// that means Data Policy has already been able to verify the Interest.
// No more further processes.
return;
}
OnFailure onFailure = bind(onValidationFailed, data.shared_from_this(), _1);
afterCheckPolicy(nextSteps, onFailure);
}
void
Validator::onData(const Interest& interest,
const Data& data,
const shared_ptr<ValidationRequest>& nextStep)
{
shared_ptr<const Data> certificateData = preCertificateValidation(data);
if (!static_cast<bool>(certificateData))
return nextStep->m_onDataValidationFailed(data.shared_from_this(),
"Cannot decode cert: " + data.getName().toUri());
validate(*certificateData,
nextStep->m_onDataValidated, nextStep->m_onDataValidationFailed,
nextStep->m_nSteps);
}
bool
Validator::verifySignature(const Data& data, const PublicKey& key)
{
if (!data.getSignature().hasKeyLocator())
return false;
return verifySignature(data.wireEncode().value(),
data.wireEncode().value_size() -
data.getSignature().getValue().size(),
data.getSignature(), key);
}
bool
Validator::verifySignature(const Interest& interest, const PublicKey& key)
{
const Name& interestName = interest.getName();
if (interestName.size() < 2)
return false;
try
{
const Block& nameBlock = interestName.wireEncode();
Signature sig(interestName[-2].blockFromValue(),
interestName[-1].blockFromValue());
if (!sig.hasKeyLocator())
return false;
return verifySignature(nameBlock.value(),
nameBlock.value_size() - interestName[-1].size(),
sig, key);
}
catch (Block::Error& e)
{
return false;
}
}
bool
Validator::verifySignature(const uint8_t* buf,
const size_t size,
const Signature& sig,
const PublicKey& key)
{
try
{
using namespace CryptoPP;
switch (sig.getType())
{
case tlv::SignatureSha256WithRsa:
{
if (key.getKeyType() != KEY_TYPE_RSA)
return false;
RSA::PublicKey publicKey;
ByteQueue queue;
queue.Put(reinterpret_cast<const byte*>(key.get().buf()), key.get().size());
publicKey.Load(queue);
RSASS<PKCS1v15, SHA256>::Verifier verifier(publicKey);
return verifier.VerifyMessage(buf, size,
sig.getValue().value(), sig.getValue().value_size());
}
case tlv::SignatureSha256WithEcdsa:
{
if (key.getKeyType() != KEY_TYPE_ECDSA)
return false;
ECDSA<ECP, SHA256>::PublicKey publicKey;
ByteQueue queue;
queue.Put(reinterpret_cast<const byte*>(key.get().buf()), key.get().size());
publicKey.Load(queue);
ECDSA<ECP, SHA256>::Verifier verifier(publicKey);
uint32_t length = 0;
StringSource src(key.get().buf(), key.get().size(), true);
BERSequenceDecoder subjectPublicKeyInfo(src);
{
BERSequenceDecoder algorithmInfo(subjectPublicKeyInfo);
{
OID algorithm;
algorithm.decode(algorithmInfo);
OID curveId;
curveId.decode(algorithmInfo);
if (curveId == SECP256R1)
length = 256;
else if (curveId == SECP384R1)
length = 384;
else
return false;
}
}
switch (length)
{
case 256:
{
uint8_t buffer[64];
size_t usedSize = DSAConvertSignatureFormat(buffer, 64, DSA_P1363,
sig.getValue().value(),
sig.getValue().value_size(),
DSA_DER);
return verifier.VerifyMessage(buf, size, buffer, usedSize);
}
case 384:
{
uint8_t buffer[96];
size_t usedSize = DSAConvertSignatureFormat(buffer, 96, DSA_P1363,
sig.getValue().value(),
sig.getValue().value_size(),
DSA_DER);
return verifier.VerifyMessage(buf, size, buffer, usedSize);
}
default:
return false;
}
}
default:
// Unsupported sig type
return false;
}
}
catch (CryptoPP::Exception& e)
{
return false;
}
}
bool
Validator::verifySignature(const uint8_t* buf, const size_t size, const DigestSha256& sig)
{
try
{
ConstBufferPtr buffer = crypto::sha256(buf, size);
const Block& sigValue = sig.getValue();
if (static_cast<bool>(buffer) &&
buffer->size() == sigValue.value_size() &&
buffer->size() == crypto::SHA256_DIGEST_SIZE)
{
const uint8_t* p1 = buffer->buf();
const uint8_t* p2 = sigValue.value();
return 0 == memcmp(p1, p2, crypto::SHA256_DIGEST_SIZE);
}
else
return false;
}
catch (CryptoPP::Exception& e)
{
return false;
}
}
void
Validator::onTimeout(const Interest& interest,
int remainingRetries,
const OnFailure& onFailure,
const shared_ptr<ValidationRequest>& validationRequest)
{
if (remainingRetries > 0)
// Issue the same expressInterest except decrement nRetrials.
m_face->expressInterest(interest,
bind(&Validator::onData, this, _1, _2, validationRequest),
bind(&Validator::onTimeout, this, _1,
remainingRetries - 1, onFailure, validationRequest));
else
onFailure("Cannot fetch cert: " + interest.getName().toUri());
}
void
Validator::afterCheckPolicy(const std::vector<shared_ptr<ValidationRequest> >& nextSteps,
const OnFailure& onFailure)
{
if (m_face == nullptr)
{
onFailure("Require more information to validate the packet!");
return;
}
for (std::vector<shared_ptr<ValidationRequest> >::const_iterator it = nextSteps.begin();
it != nextSteps.end(); it++)
{
m_face->expressInterest((*it)->m_interest,
bind(&Validator::onData, this, _1, _2, *it),
bind(&Validator::onTimeout,
this, _1, (*it)->m_nRetries,
onFailure,
*it));
}
}
} // namespace ndn