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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Xingyu Ma <maxy12@cs.ucla.edu>
* Alexander Afanasyev <alexander.afanasyev@ucla.edu>
* Yingdi Yu <yingdi@cs.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#include "common.hpp"
#include "sec-tpm-file.hpp"
#include <boost/filesystem.hpp>
#include <boost/algorithm/string.hpp>
#include "cryptopp.hpp"
#include <sys/types.h>
#include <sys/stat.h>
#include <algorithm>
using namespace std;
namespace ndn {
class SecTpmFile::Impl
{
public:
Impl(const string& dir)
{
if (dir.empty())
m_keystorePath = boost::filesystem::path(getenv("HOME")) / ".ndn" / "ndnsec-tpm-file";
else
m_keystorePath = dir;
boost::filesystem::create_directories (m_keystorePath);
}
boost::filesystem::path
nameTransform(const string& keyName, const string& extension)
{
using namespace CryptoPP;
string digest;
SHA256 hash;
StringSource src(keyName,
true,
new HashFilter(hash,
new Base64Encoder(new CryptoPP::StringSink(digest))));
boost::algorithm::trim(digest);
std::replace(digest.begin(), digest.end(), '/', '%');
return m_keystorePath / (digest + extension);
}
string
maintainMapping(const string& keyName)
{
string keyFileName = nameTransform(keyName, "").string();
ofstream outfile;
string dirFile = (m_keystorePath / "mapping.txt").string();
outfile.open(dirFile.c_str(), std::ios_base::app);
outfile << keyName << ' ' << keyFileName << '\n';
outfile.close();
return keyFileName;
}
public:
boost::filesystem::path m_keystorePath;
};
SecTpmFile::SecTpmFile(const string& dir)
: m_impl(new Impl(dir))
, m_inTerminal(false)
{}
void
SecTpmFile::generateKeyPairInTpm(const Name& keyName, KeyType keyType, int keySize)
{
string keyURI = keyName.toUri();
if (doesKeyExistInTpm(keyName, KEY_CLASS_PUBLIC))
throw Error("public key exists");
if (doesKeyExistInTpm(keyName, KEY_CLASS_PRIVATE))
throw Error("private key exists");
string keyFileName = m_impl->maintainMapping(keyURI);
try
{
switch (keyType)
{
case KEY_TYPE_RSA:
{
using namespace CryptoPP;
AutoSeededRandomPool rng;
InvertibleRSAFunction privateKey;
privateKey.Initialize(rng, keySize);
string privateKeyFileName = keyFileName + ".pri";
Base64Encoder privateKeySink(new FileSink(privateKeyFileName.c_str()));
privateKey.DEREncode(privateKeySink);
privateKeySink.MessageEnd();
RSAFunction publicKey(privateKey);
string publicKeyFileName = keyFileName + ".pub";
Base64Encoder publicKeySink(new FileSink(publicKeyFileName.c_str()));
publicKey.DEREncode(publicKeySink);
publicKeySink.MessageEnd();
/*set file permission*/
chmod(privateKeyFileName.c_str(), 0000400);
chmod(publicKeyFileName.c_str(), 0000444);
return;
}
default:
throw Error("Unsupported key type!");
}
}
catch (CryptoPP::Exception& e)
{
throw Error(e.what());
}
}
void
SecTpmFile::deleteKeyPairInTpm(const Name& keyName)
{
boost::filesystem::path publicKeyPath(m_impl->nameTransform(keyName.toUri(), ".pub"));
boost::filesystem::path privateKeyPath(m_impl->nameTransform(keyName.toUri(), ".pri"));
if (boost::filesystem::exists(publicKeyPath))
boost::filesystem::remove(publicKeyPath);
if (boost::filesystem::exists(privateKeyPath))
boost::filesystem::remove(privateKeyPath);
}
shared_ptr<PublicKey>
SecTpmFile::getPublicKeyFromTpm(const Name& keyName)
{
string keyURI = keyName.toUri();
if (!doesKeyExistInTpm(keyName, KEY_CLASS_PUBLIC))
throw Error("Public Key does not exist");
ostringstream os;
try
{
using namespace CryptoPP;
FileSource(m_impl->nameTransform(keyURI, ".pub").string().c_str(),
true,
new Base64Decoder(new FileSink(os)));
}
catch (CryptoPP::Exception& e)
{
throw Error(e.what());
}
return make_shared<PublicKey>(reinterpret_cast<const uint8_t*>(os.str().c_str()),
os.str().size());
}
ConstBufferPtr
SecTpmFile::exportPrivateKeyPkcs8FromTpm(const Name& keyName)
{
OBufferStream privateKeyOs;
CryptoPP::FileSource(m_impl->nameTransform(keyName.toUri(), ".pri").string().c_str(), true,
new CryptoPP::Base64Decoder(new CryptoPP::FileSink(privateKeyOs)));
return privateKeyOs.buf();
}
bool
SecTpmFile::importPrivateKeyPkcs8IntoTpm(const Name& keyName, const uint8_t* buf, size_t size)
{
try
{
using namespace CryptoPP;
string keyFileName = m_impl->maintainMapping(keyName.toUri());
keyFileName.append(".pri");
StringSource(buf, size,
true,
new Base64Encoder(new FileSink(keyFileName.c_str())));
return true;
}
catch (CryptoPP::Exception& e)
{
return false;
}
}
bool
SecTpmFile::importPublicKeyPkcs1IntoTpm(const Name& keyName, const uint8_t* buf, size_t size)
{
try
{
using namespace CryptoPP;
string keyFileName = m_impl->maintainMapping(keyName.toUri());
keyFileName.append(".pub");
StringSource(buf, size,
true,
new Base64Encoder(new FileSink(keyFileName.c_str())));
return true;
}
catch (CryptoPP::Exception& e)
{
return false;
}
}
Block
SecTpmFile::signInTpm(const uint8_t* data, size_t dataLength,
const Name& keyName, DigestAlgorithm digestAlgorithm)
{
string keyURI = keyName.toUri();
if (!doesKeyExistInTpm(keyName, KEY_CLASS_PRIVATE))
throw Error("private key doesn't exists");
try
{
using namespace CryptoPP;
AutoSeededRandomPool rng;
//Read private key
ByteQueue bytes;
FileSource file(m_impl->nameTransform(keyURI, ".pri").string().c_str(),
true, new Base64Decoder);
file.TransferTo(bytes);
bytes.MessageEnd();
RSA::PrivateKey privateKey;
privateKey.Load(bytes);
//Sign message
switch (digestAlgorithm)
{
case DIGEST_ALGORITHM_SHA256:
{
RSASS<PKCS1v15, SHA256>::Signer signer(privateKey);
OBufferStream os;
StringSource(data, dataLength,
true,
new SignerFilter(rng, signer, new FileSink(os)));
return Block(Tlv::SignatureValue, os.buf());
}
default:
throw Error("Unsupported digest algorithm!");
}
}
catch (CryptoPP::Exception& e)
{
throw Error(e.what());
}
}
ConstBufferPtr
SecTpmFile::decryptInTpm(const uint8_t* data, size_t dataLength,
const Name& keyName, bool isSymmetric)
{
throw Error("SecTpmFile::decryptInTpm is not supported!");
// string keyURI = keyName.toUri();
// if (!isSymmetric)
// {
// if (!doesKeyExistInTpm(keyName, KEY_CLASS_PRIVATE))
// throw Error("private key doesn't exist");
// try{
// using namespace CryptoPP;
// AutoSeededRandomPool rng;
// //Read private key
// ByteQueue bytes;
// FileSource file(m_impl->nameTransform(keyURI, ".pri").string().c_str(), true, new Base64Decoder);
// file.TransferTo(bytes);
// bytes.MessageEnd();
// RSA::PrivateKey privateKey;
// privateKey.Load(bytes);
// RSAES_PKCS1v15_Decryptor decryptor(privateKey);
// OBufferStream os;
// StringSource(data, dataLength, true, new PK_DecryptorFilter(rng, decryptor, new FileSink(os)));
// return os.buf();
// }
// catch (CryptoPP::Exception& e){
// throw Error(e.what());
// }
// }
// else
// {
// throw Error("Symmetric encryption is not implemented!");
// // if (!doesKeyExistInTpm(keyName, KEY_CLASS_SYMMETRIC))
// // throw Error("symmetric key doesn't exist");
// // try{
// // string keyBits;
// // string symKeyFileName = m_impl->nameTransform(keyURI, ".key");
// // FileSource(symKeyFileName, true, new HexDecoder(new StringSink(keyBits)));
// // using CryptoPP::AES;
// // AutoSeededRandomPool rnd;
// // byte iv[AES::BLOCKSIZE];
// // rnd.GenerateBlock(iv, AES::BLOCKSIZE);
// // CFB_Mode<AES>::Decryption decryptor;
// // decryptor.SetKeyWithIV(reinterpret_cast<const uint8_t*>(keyBits.c_str()), keyBits.size(), iv);
// // OBufferStream os;
// // StringSource(data, dataLength, true, new StreamTransformationFilter(decryptor,new FileSink(os)));
// // return os.buf();
// // }catch (CryptoPP::Exception& e){
// // throw Error(e.what());
// // }
// }
}
ConstBufferPtr
SecTpmFile::encryptInTpm(const uint8_t* data, size_t dataLength,
const Name& keyName, bool isSymmetric)
{
throw Error("SecTpmFile::encryptInTpm is not supported!");
// string keyURI = keyName.toUri();
// if (!isSymmetric)
// {
// if (!doesKeyExistInTpm(keyName, KEY_CLASS_PUBLIC))
// throw Error("public key doesn't exist");
// try
// {
// using namespace CryptoPP;
// AutoSeededRandomPool rng;
// //Read private key
// ByteQueue bytes;
// FileSource file(m_impl->nameTransform(keyURI, ".pub").string().c_str(), true, new Base64Decoder);
// file.TransferTo(bytes);
// bytes.MessageEnd();
// RSA::PublicKey publicKey;
// publicKey.Load(bytes);
// OBufferStream os;
// RSAES_PKCS1v15_Encryptor encryptor(publicKey);
// StringSource(data, dataLength, true, new PK_EncryptorFilter(rng, encryptor, new FileSink(os)));
// return os.buf();
// }
// catch (CryptoPP::Exception& e){
// throw Error(e.what());
// }
// }
// else
// {
// throw Error("Symmetric encryption is not implemented!");
// // if (!doesKeyExistInTpm(keyName, KEY_CLASS_SYMMETRIC))
// // throw Error("symmetric key doesn't exist");
// // try{
// // string keyBits;
// // string symKeyFileName = m_impl->nameTransform(keyURI, ".key");
// // FileSource(symKeyFileName, true, new HexDecoder(new StringSink(keyBits)));
// // using CryptoPP::AES;
// // AutoSeededRandomPool rnd;
// // byte iv[AES::BLOCKSIZE];
// // rnd.GenerateBlock(iv, AES::BLOCKSIZE);
// // CFB_Mode<AES>::Encryption encryptor;
// // encryptor.SetKeyWithIV(reinterpret_cast<const uint8_t*>(keyBits.c_str()), keyBits.size(), iv);
// // OBufferStream os;
// // StringSource(data, dataLength, true, new StreamTransformationFilter(encryptor, new FileSink(os)));
// // return os.buf();
// // }catch (CryptoPP::Exception& e){
// // throw Error(e.what());
// // }
// }
}
void
SecTpmFile::generateSymmetricKeyInTpm(const Name& keyName, KeyType keyType, int keySize)
{
throw Error("SecTpmFile::generateSymmetricKeyInTpm is not supported!");
// string keyURI = keyName.toUri();
// if (doesKeyExistInTpm(keyName, KEY_CLASS_SYMMETRIC))
// throw Error("symmetric key exists");
// string keyFileName = m_impl->maintainMapping(keyURI);
// string symKeyFileName = keyFileName + ".key";
// try{
// switch (keyType){
// case KEY_TYPE_AES:
// {
// using namespace CryptoPP;
// AutoSeededRandomPool rng;
// SecByteBlock key(0x00, keySize);
// rng.GenerateBlock(key, keySize);
// StringSource(key, key.size(), true, new HexEncoder(new FileSink(symKeyFileName.c_str())));
// chmod(symKeyFileName.c_str(), 0000400);
// return;
// }
// default:
// throw Error("Unsupported symmetric key type!");
// }
// }catch (CryptoPP::Exception& e){
// throw Error(e.what());
// }
}
bool
SecTpmFile::doesKeyExistInTpm(const Name& keyName, KeyClass keyClass)
{
string keyURI = keyName.toUri();
if (keyClass == KEY_CLASS_PUBLIC)
{
if (boost::filesystem::exists(m_impl->nameTransform(keyURI, ".pub")))
return true;
else
return false;
}
if (keyClass == KEY_CLASS_PRIVATE)
{
if (boost::filesystem::exists(m_impl->nameTransform(keyURI, ".pri")))
return true;
else
return false;
}
if (keyClass == KEY_CLASS_SYMMETRIC)
{
if (boost::filesystem::exists(m_impl->nameTransform(keyURI, ".key")))
return true;
else
return false;
}
return false;
}
bool
SecTpmFile::generateRandomBlock(uint8_t* res, size_t size)
{
try
{
CryptoPP::AutoSeededRandomPool rng;
rng.GenerateBlock(res, size);
return true;
}
catch (CryptoPP::Exception& e)
{
return false;
}
}
} // namespace ndn