bool
PolicyManager::verifySha256WithEcdsaSignature
(const Blob& signature, const SignedBlob& signedBlob, const Blob& publicKeyDer)
{
// Set signedPortionDigest to the digest of the signed portion of the signedBlob.
uint8_t signedPortionDigest[SHA256_DIGEST_LENGTH];
ndn_digestSha256
(signedBlob.signedBuf(), signedBlob.signedSize(), signedPortionDigest);
// Verify the signedPortionDigest.
// Use a temporary pointer since d2i updates it.
const uint8_t *derPointer = publicKeyDer.buf();
EC_KEY *ecPublicKey = d2i_EC_PUBKEY(NULL, &derPointer, publicKeyDer.size());
if (!ecPublicKey)
throw UnrecognizedKeyFormatException
("Error decoding public key in d2i_EC_PUBKEY");
int success = ECDSA_verify
(NID_sha256, signedPortionDigest, sizeof(signedPortionDigest),
(uint8_t *)signature.buf(),signature.size(), ecPublicKey);
// Free the public key before checking for success.
EC_KEY_free(ecPublicKey);
// ECDSA_verify returns 1 for a valid signature.
return (success == 1);
}
void
Encryptor::encryptData
(Data& data, const Blob& payload, const Name& keyName, const Blob& key,
const EncryptParams& params)
{
data.getName().append(getNAME_COMPONENT_FOR()).append(keyName);
ndn_EncryptAlgorithmType algorithmType = params.getAlgorithmType();
if (algorithmType == ndn_EncryptAlgorithmType_AesCbc ||
algorithmType == ndn_EncryptAlgorithmType_AesEcb) {
EncryptedContent content = encryptSymmetric(payload, key, keyName, params);
data.setContent(content.wireEncode(*TlvWireFormat::get()));
}
else if (algorithmType == ndn_EncryptAlgorithmType_RsaPkcs ||
algorithmType == ndn_EncryptAlgorithmType_RsaOaep) {
// Openssl doesn't have an easy way to get the maximum plain text size, so
// try to encrypt the payload first and catch the error if it is too big.
try {
EncryptedContent content = encryptAsymmetric(payload, key, keyName, params);
data.setContent(content.wireEncode(*TlvWireFormat::get()));
return;
} catch (SecurityException&) {
// The payload is larger than the maximum plaintext size. Continue.
}
// 128-bit nonce.
ptr_lib::shared_ptr<vector<uint8_t> > nonceKeyBuffer(new vector<uint8_t>(16));
ndn_Error error;
if ((error = CryptoLite::generateRandomBytes
(&nonceKeyBuffer->front(), nonceKeyBuffer->size())))
throw runtime_error(ndn_getErrorString(error));
Blob nonceKey(nonceKeyBuffer, false);
Name nonceKeyName(keyName);
nonceKeyName.append("nonce");
EncryptParams symmetricParams
(ndn_EncryptAlgorithmType_AesCbc, AesAlgorithm::BLOCK_SIZE);
EncryptedContent nonceContent = encryptSymmetric
(payload, nonceKey, nonceKeyName, symmetricParams);
EncryptedContent payloadContent = encryptAsymmetric
(nonceKey, key, keyName, params);
Blob nonceContentEncoding = nonceContent.wireEncode();
Blob payloadContentEncoding = payloadContent.wireEncode();
ptr_lib::shared_ptr<vector<uint8_t> > content(new vector<uint8_t>
(nonceContentEncoding.size() + payloadContentEncoding.size()));
ndn_memcpy(&content->front(), payloadContentEncoding.buf(),
payloadContentEncoding.size());
ndn_memcpy(&content->front() + payloadContentEncoding.size(),
nonceContentEncoding.buf(), nonceContentEncoding.size());
data.setContent(Blob(content, false));
}
else
throw runtime_error("Unsupported encryption method");
}
/**
* Decode signatureInfo as a signature info and signatureValue as the related
* SignatureValue, and return a new object which is a subclass of Signature.
* @param signatureInfo The signature input buffer to decode.
* @param signatureValue The signature value input buffer to decode.
* @return A new object which is a subclass of Signature.
*/
ptr_lib::shared_ptr<Signature>
decodeSignatureInfoAndValue
(const Blob& signatureInfo, const Blob& signatureValue)
{
return decodeSignatureInfoAndValue
(signatureInfo.buf(), signatureInfo.size(), signatureValue.buf(),
signatureValue.size());
}
Blob
RsaAlgorithm::decrypt
(const Blob& keyBits, const Blob& encryptedData, const EncryptParams& params)
{
TpmPrivateKey privateKey;
privateKey.loadPkcs8(keyBits.buf(), keyBits.size());
return privateKey.decrypt
(encryptedData.buf(), encryptedData.size(), params.getAlgorithmType());
}
void
PrivateKeyStorage::decodeEcPrivateKey
(const ptr_lib::shared_ptr<DerNode>& algorithmParameters,
const Blob& privateKeyDer, EcPrivateKeyLite& privateKey)
{
// Find the curveId in EC_KEY_INFO.
int curveId = -1;
string oidString = algorithmParameters->toVal().toRawStr();
for (size_t i = 0 ; i < ndn_getEcKeyInfoCount(); ++i) {
const struct ndn_EcKeyInfo *info = ndn_getEcKeyInfo(i);
OID curveOid(info->oidIntegerList, info->oidIntegerListLength);
if (curveOid.toString() == oidString) {
curveId = info->curveId;
break;
}
}
if (curveId == -1)
throw SecurityException
("FilePrivateKeyStorage::decodeEcPrivateKey: Unrecognized EC algorithm parameters");
// Get the value in the octet string.
ptr_lib::shared_ptr<DerNode> parsedNode = DerNode::parse(privateKeyDer.buf(), 0);
DerNode::DerOctetString* octetString = dynamic_cast<DerNode::DerOctetString*>
(parsedNode->getChildren()[1].get());
if (!octetString)
throw SecurityException
("FilePrivateKeyStorage::decodeEcPrivateKey: Can't get the private key octet string");
Blob octetStringValue = octetString->toVal();
ndn_Error error;
if ((error = privateKey.setByCurve(curveId, octetStringValue)))
throw SecurityException
(string("PrivateKeyStorage::decodeEcPrivateKey ") + ndn_getErrorString(error));
}
void
wireDecode
(const Blob& input,
WireFormat& wireFormat = *WireFormat::getDefaultWireFormat())
{
wireDecode(input.buf(), input.size(), wireFormat);
}
EncryptKey
RsaAlgorithm::deriveEncryptKey(const Blob& keyBits)
{
TpmPrivateKey privateKey;
privateKey.loadPkcs8(keyBits.buf(), keyBits.size());
return EncryptKey(privateKey.derivePublicKey());
}
/**
* Verify the RSA signature on the SignedBlob using the given public key.
* TODO: Move this general verification code to a more central location.
* @param signature The Sha256WithRsaSignature.
* @param signedBlob the SignedBlob with the signed portion to verify.
* @param publicKeyDer The DER-encoded public key used to verify the signature.
* @return true if the signature verifies, false if not.
*/
static bool
verifySha256WithRsaSignature
(const Sha256WithRsaSignature* signature, const SignedBlob& signedBlob,
const Blob& publicKeyDer)
{
// Set signedPortionDigest to the digest of the signed portion of the wire encoding.
uint8_t signedPortionDigest[SHA256_DIGEST_LENGTH];
// wireEncode returns the cached encoding if available.
ndn_digestSha256
(signedBlob.signedBuf(), signedBlob.signedSize(), signedPortionDigest);
// Verify the signedPortionDigest.
// Use a temporary pointer since d2i updates it.
const uint8_t *derPointer = publicKeyDer.buf();
RSA *rsaPublicKey = d2i_RSA_PUBKEY(NULL, &derPointer, publicKeyDer.size());
if (!rsaPublicKey)
throw UnrecognizedKeyFormatException("Error decoding public key in d2i_RSAPublicKey");
int success = RSA_verify
(NID_sha256, signedPortionDigest, sizeof(signedPortionDigest), (uint8_t *)signature->getSignature().buf(),
signature->getSignature().size(), rsaPublicKey);
// Free the public key before checking for success.
RSA_free(rsaPublicKey);
// RSA_verify returns 1 for a valid signature.
return (success == 1);
}
TEST_F(TestConfigPolicyManager, Refresh10s)
{
ifstream dataFile((policyConfigDirectory_ + "/testData").c_str());
stringstream encodedData;
encodedData << dataFile.rdbuf();
vector<uint8_t> dataBlob;
fromBase64(encodedData.str(), dataBlob);
ptr_lib::shared_ptr<Data> data(new Data());
data->wireDecode(dataBlob);
// This test is needed, since the KeyChain will express interests in unknown
// certificates.
VerificationResult vr = doVerify(*policyManager_, data);
ASSERT_TRUE(vr.hasFurtherSteps_) <<
"ConfigPolicyManager did not create ValidationRequest for unknown certificate";
ASSERT_EQ(vr.successCount_, 0) <<
"ConfigPolicyManager called success callback with pending ValidationRequest";
ASSERT_EQ(vr.failureCount_, 0) <<
"ConfigPolicyManager called failure callback with pending ValidationRequest";
// Now save the cert data to our anchor directory, and wait.
// We have to sign it with the current identity or the policy manager will
// create an interest for the signing certificate.
IdentityCertificate cert;
vector<uint8_t> certData;
fromBase64(CERT_DUMP, certData);
cert.wireDecode(Blob(certData));
keyChain_->signByIdentity(cert, identityName_);
Blob signedCertBlob = cert.wireEncode();
string encodedCert = toBase64(signedCertBlob.buf(), signedCertBlob.size(), true);
{
ofstream certFile(testCertFile_.c_str());
certFile << encodedCert;
}
// Still too early for refresh to pick it up.
vr = doVerify(*policyManager_, data);
ASSERT_TRUE(vr.hasFurtherSteps_) <<
"ConfigPolicyManager refresh occured sooner than specified";
ASSERT_EQ(vr.successCount_, 0) <<
"ConfigPolicyManager called success callback with pending ValidationRequest";
ASSERT_EQ(vr.failureCount_, 0) <<
"ConfigPolicyManager called failure callback with pending ValidationRequest";
usleep(6000000);
// Now we should find it.
vr = doVerify(*policyManager_, data);
ASSERT_FALSE(vr.hasFurtherSteps_) <<
"ConfigPolicyManager did not refresh certificate store";
ASSERT_EQ(vr.successCount_, 1) <<
"Verification success called " << vr.successCount_ << " times instead of 1";
ASSERT_EQ(vr.failureCount_, 0) <<
"ConfigPolicyManager did not verify valid signed data";
}
bool
PolicyManager::verifyDigestSha256Signature
(const Blob& signature, const SignedBlob& signedBlob)
{
// Set signedPortionDigest to the digest of the signed portion of the signedBlob.
uint8_t signedPortionDigest[SHA256_DIGEST_LENGTH];
ndn_digestSha256
(signedBlob.signedBuf(), signedBlob.signedSize(), signedPortionDigest);
return signature.size() == sizeof(signedPortionDigest) && ndn_memcmp
(signature.buf(), signedPortionDigest, sizeof(signedPortionDigest)) == 0;
}
ptr_lib::shared_ptr<PublicKey>
PublicKey::fromDer(const Blob& keyDer)
{
// Use a temporary pointer since d2i updates it.
const uint8_t *derPointer = keyDer.buf();
RSA *publicKey = d2i_RSA_PUBKEY(NULL, &derPointer, keyDer.size());
if (!publicKey)
throw UnrecognizedKeyFormatException("Error decoding public key DER");
RSA_free(publicKey);
return ptr_lib::shared_ptr<PublicKey>(new PublicKey(OID(vector<int>(RSA_OID, RSA_OID + sizeof(RSA_OID))), keyDer));
}
void
Data::wireDecode(const Blob& input, WireFormat& wireFormat)
{
size_t signedPortionBeginOffset, signedPortionEndOffset;
wireFormat.decodeData(*this, input.buf(), input.size(), &signedPortionBeginOffset, &signedPortionEndOffset);
if (&wireFormat == WireFormat::getDefaultWireFormat())
// This is the default wire encoding.
// Take a pointer to the input Blob without copying.
setDefaultWireEncoding
(SignedBlob(input, signedPortionBeginOffset, signedPortionEndOffset),
WireFormat::getDefaultWireFormat());
else
setDefaultWireEncoding(SignedBlob(), 0);
}
ec_key_st*
FilePrivateKeyStorage::decodeEcPrivateKey
(const ptr_lib::shared_ptr<DerNode>& algorithmParameters,
const Blob& privateKeyDer)
{
// Find the curveId in EC_KEY_INFO.
int curveId = -1;
string oidString = algorithmParameters->toVal().toRawStr();
for (size_t i = 0 ; i < sizeof(EC_KEY_INFO) / sizeof(EC_KEY_INFO[0]); ++i) {
OID curveOid(EC_KEY_INFO[i].oidIntegerList, EC_KEY_INFO[i].oidIntegerListLength);
if (curveOid.toString() == oidString) {
curveId = EC_KEY_INFO[i].curveId;
break;
}
}
if (curveId == -1)
throw SecurityException
("FilePrivateKeyStorage::decodeEcPrivateKey: Unrecognized EC algorithm parameters");
// Get the value in the octet string.
ptr_lib::shared_ptr<DerNode> parsedNode = DerNode::parse(privateKeyDer.buf(), 0);
DerNode::DerOctetString* octetString = dynamic_cast<DerNode::DerOctetString*>
(parsedNode->getChildren()[1].get());
if (!octetString)
throw SecurityException
("FilePrivateKeyStorage::decodeEcPrivateKey: Can't get the private key octet string");
Blob octetStringValue = octetString->toVal();
BIGNUM* keyBignum = BN_bin2bn(octetStringValue.buf(), octetStringValue.size(), NULL);
if (!keyBignum) {
// We don't expect this to happen.
throw SecurityException
("FilePrivateKeyStorage::decodeEcPrivateKey: Can't create a BIGNUM for the private key value");
}
EC_KEY* privateKey = EC_KEY_new_by_curve_name(curveId);
if (!privateKey) {
// We don't expect this to happen.
BN_free(keyBignum);
throw SecurityException
("FilePrivateKeyStorage::decodeEcPrivateKey: Can't create an EC key for the curve ID");
}
EC_KEY_set_private_key(privateKey, keyBignum);
BN_free(keyBignum);
return privateKey;
}
Blob
DerNode::DerStructure::encode()
{
DynamicUInt8Vector buffer(10);
size_t bufferPosition = 0;
updateSize();
encodeHeader(size_);
bufferPosition = buffer.copy(&header_[0], header_.size(), bufferPosition);
for (size_t i = 0; i < nodeList_.size(); ++i) {
DerNode& n = *nodeList_[i];
Blob encodedChild = n.encode();
bufferPosition = buffer.copy
(encodedChild.buf(), encodedChild.size(), bufferPosition);
}
buffer.get()->resize(bufferPosition);
return Blob(buffer.get(), false);
}
Blob
sign(const Blob& data, const Name& keyName, DigestAlgorithm digestAlgorithm = DIGEST_ALGORITHM_SHA256)
{
return sign(data.buf(), data.size(), keyName, digestAlgorithm);
}
Blob
decrypt(const Name& keyName, const Blob& data, bool isSymmetric = false)
{
return decrypt(keyName, data.buf(), data.size(), isSymmetric);
}
/**
* A utility function to call the normal sqlite3_bind_blob where the value and
* length are blob.buf() and blob.size().
*/
static int sqlite3_bind_blob
(sqlite3_stmt* statement, int index, const Blob& value, void(*destructor)(void*))
{
return sqlite3_bind_blob(statement, index, value.buf(), value.size(), destructor);
}
Blob
FilePrivateKeyStorage::sign
(const uint8_t *data, size_t dataLength, const Name& keyName,
DigestAlgorithm digestAlgorithm)
{
string keyURI = keyName.toUri();
if (!doesKeyExist(keyName, KEY_CLASS_PRIVATE))
throw SecurityException
("FilePrivateKeyStorage::sign: private key doesn't exist");
if (digestAlgorithm != DIGEST_ALGORITHM_SHA256)
throw SecurityException
("FilePrivateKeyStorage::sign: Unsupported digest algorithm");
// Read the private key.
ifstream file(nameTransform(keyURI, ".pri").c_str());
stringstream base64;
base64 << file.rdbuf();
vector<uint8_t> pkcs8Der;
fromBase64(base64.str(), pkcs8Der);
// The private key is generated by NFD which stores as PKCS #8. Decode it
// to find the algorithm OID and the inner private key DER.
ptr_lib::shared_ptr<DerNode> parsedNode = DerNode::parse(&pkcs8Der[0], 0);
const std::vector<ptr_lib::shared_ptr<DerNode> >& pkcs8Children =
parsedNode->getChildren();
// Get the algorithm OID and parameters.
const std::vector<ptr_lib::shared_ptr<DerNode> >& algorithmIdChildren =
DerNode::getSequence(pkcs8Children, 1).getChildren();
string oidString
(dynamic_cast<DerNode::DerOid&>(*algorithmIdChildren[0]).toVal().toRawStr());
ptr_lib::shared_ptr<DerNode> algorithmParameters = algorithmIdChildren[1];
// Get the value of the 3rd child which is the octet string.
Blob privateKeyDer = pkcs8Children[2]->toVal();
// Get the digest to sign.
uint8_t digest[SHA256_DIGEST_LENGTH];
ndn_digestSha256(data, dataLength, digest);
// TODO: use RSA_size, etc. to get the proper size of the signature buffer.
uint8_t signatureBits[1000];
unsigned int signatureBitsLength;
// Decode the private key and sign.
if (oidString == RSA_ENCRYPTION_OID) {
// Use a temporary pointer since d2i updates it.
const uint8_t* derPointer = privateKeyDer.buf();
rsa_st* privateKey = d2i_RSAPrivateKey(NULL, &derPointer, privateKeyDer.size());
if (!privateKey)
throw SecurityException
("FilePrivateKeyStorage::sign: Error decoding the RSA private key DER");
int success = RSA_sign
(NID_sha256, digest, sizeof(digest), signatureBits, &signatureBitsLength,
privateKey);
// Free the private key before checking for success.
RSA_free(privateKey);
if (!success)
throw SecurityException("FilePrivateKeyStorage::sign: Error in RSA_sign");
}
else if (oidString == EC_ENCRYPTION_OID) {
ec_key_st* privateKey = decodeEcPrivateKey(algorithmParameters, privateKeyDer);
int success = ECDSA_sign
(NID_sha256, digest, sizeof(digest), signatureBits, &signatureBitsLength,
privateKey);
// Free the private key before checking for success.
EC_KEY_free(privateKey);
if (!success)
throw SecurityException("FilePrivateKeyStorage::sign: Error in ECDSA_sign");
}
else
throw SecurityException
("FilePrivateKeyStorage::sign: Unrecognized private key OID");
return Blob(signatureBits, (size_t)signatureBitsLength);
}
void
FilePrivateKeyStorage::generateKeyPair
(const Name& keyName, const KeyParams& params)
{
if (doesKeyExist(keyName, KEY_CLASS_PUBLIC))
throw SecurityException("Public Key already exists");
if (doesKeyExist(keyName, KEY_CLASS_PRIVATE))
throw SecurityException("Private Key already exists");
Blob publicKeyDer;
Blob privateKeyDer;
if (params.getKeyType() == KEY_TYPE_RSA) {
const RsaKeyParams& rsaParams = static_cast<const RsaKeyParams&>(params);
BIGNUM* exponent = 0;
RSA* rsa = 0;
exponent = BN_new();
if (BN_set_word(exponent, RSA_F4) == 1) {
rsa = RSA_new();
if (RSA_generate_key_ex(rsa, rsaParams.getKeySize(), exponent, NULL) == 1) {
// Encode the public key.
int length = i2d_RSA_PUBKEY(rsa, NULL);
publicKeyDer = Blob(ptr_lib::make_shared<vector<uint8_t> >(length), false);
uint8_t* derPointer = const_cast<uint8_t*>(publicKeyDer.buf());
i2d_RSA_PUBKEY(rsa, &derPointer);
// Encode the private key.
length = i2d_RSAPrivateKey(rsa, NULL);
vector<uint8_t> pkcs1PrivateKeyDer(length);
derPointer = &pkcs1PrivateKeyDer[0];
i2d_RSAPrivateKey(rsa, &derPointer);
privateKeyDer = encodePkcs8PrivateKey
(pkcs1PrivateKeyDer, OID(RSA_ENCRYPTION_OID),
ptr_lib::make_shared<DerNode::DerNull>());
}
}
BN_free(exponent);
RSA_free(rsa);
}
else if (params.getKeyType() == KEY_TYPE_ECDSA) {
const EcdsaKeyParams& ecdsaParams = static_cast<const EcdsaKeyParams&>(params);
OID parametersOid;
int curveId = -1;
// Find the entry in EC_KEY_INFO.
for (size_t i = 0 ; i < sizeof(EC_KEY_INFO) / sizeof(EC_KEY_INFO[0]); ++i) {
if (EC_KEY_INFO[i].keySize == ecdsaParams.getKeySize()) {
curveId = EC_KEY_INFO[i].curveId;
parametersOid.setIntegerList
(EC_KEY_INFO[i].oidIntegerList, EC_KEY_INFO[i].oidIntegerListLength);
break;
}
}
if (curveId == -1)
throw SecurityException("Unsupported keySize for KEY_TYPE_ECDSA");
EC_KEY* ecKey = EC_KEY_new_by_curve_name(curveId);
if (ecKey != NULL) {
if (EC_KEY_generate_key(ecKey) == 1) {
// Encode the public key.
int length = i2d_EC_PUBKEY(ecKey, NULL);
vector<uint8_t> opensslPublicKeyDer(length);
uint8_t* derPointer = &opensslPublicKeyDer[0];
i2d_EC_PUBKEY(ecKey, &derPointer);
// Convert the openssl style to ndn-cxx which has the simple AlgorithmIdentifier.
// Find the bit string which is the second child.
ptr_lib::shared_ptr<DerNode> parsedNode = DerNode::parse
(&opensslPublicKeyDer[0], 0);
const std::vector<ptr_lib::shared_ptr<DerNode> >& children =
parsedNode->getChildren();
publicKeyDer = encodeSubjectPublicKeyInfo
(OID(EC_ENCRYPTION_OID),
ptr_lib::make_shared<DerNode::DerOid>(parametersOid), children[1]);
// Encode the private key.
EC_KEY_set_enc_flags(ecKey, EC_PKEY_NO_PARAMETERS | EC_PKEY_NO_PUBKEY);
length = i2d_ECPrivateKey(ecKey, NULL);
vector<uint8_t> pkcs1PrivateKeyDer(length);
derPointer = &pkcs1PrivateKeyDer[0];
i2d_ECPrivateKey(ecKey, &derPointer);
privateKeyDer = encodePkcs8PrivateKey
(pkcs1PrivateKeyDer, OID(EC_ENCRYPTION_OID),
ptr_lib::make_shared<DerNode::DerOid>(parametersOid));
}
}
EC_KEY_free(ecKey);
}
else
throw SecurityException("Unsupported key type");
string keyUri = keyName.toUri();
string publicKeyFilePath = nameTransform(keyUri, ".pub");
string privateKeyFilePath = nameTransform(keyUri, ".pri");
ofstream publicKeyFile(publicKeyFilePath.c_str());
publicKeyFile << toBase64(publicKeyDer.buf(), publicKeyDer.size(), true);
ofstream privateKeyFile(privateKeyFilePath.c_str());
privateKeyFile << toBase64(privateKeyDer.buf(), privateKeyDer.size(), true);
::chmod(publicKeyFilePath.c_str(), S_IRUSR | S_IRGRP | S_IROTH);
::chmod(privateKeyFilePath.c_str(), S_IRUSR);
}
/**
* Decode the input and update this Schedule.
* @param input The input byte array to be decoded as an immutable Blob.
*/
void
wireDecode(const Blob& input)
{
wireDecode(input.buf(), input.size());
}
static ptr_lib::shared_ptr<DerNode>
parse(const Blob& input, size_t startIdx = 0)
{
return parse(input.buf(), input.size(), startIdx);
}
/**
* Wrap sqlite3_bind_blob to bind the blob to the statement.
* @param index The binding position.
* @param blob The Blob with the byte buffer to bind.
* @param bufIsStatic (optional) If true, use SQLITE_STATIC to not copy the
* blob's byte buffer, which must remain valid until stored. If false or
* omitted, use SQLITE_TRANSIENT to copy the byte buffer.
* @return SQLite result value.
*/
int
bind(int index, const Blob& blob, bool bufIsStatic = false)
{
return bind(index, blob.buf(), blob.size(), bufIsStatic);
}
