예제 #1
0
// CheckTransaction is used to verify that a transaction
// is well formed with the respect to the security layer
// prescriptions. To be used for internal verifications.
func (client *clientImpl) checkTransaction(tx *obc.Transaction) error {
	if !client.isInitialized {
		return utils.ErrNotInitialized
	}

	if tx.Cert == nil && tx.Signature == nil {
		return utils.ErrTransactionMissingCert
	}

	if tx.Cert != nil && tx.Signature != nil {
		// Verify the transaction
		// 1. Unmarshal cert
		cert, err := primitives.DERToX509Certificate(tx.Cert)
		if err != nil {
			client.Errorf("Failed unmarshalling cert [%s].", err.Error())
			return err
		}

		// a. Get rid of the extensions that cannot be checked now
		cert.UnhandledCriticalExtensions = nil
		// b. Check against TCA certPool
		if _, err = primitives.CheckCertAgainRoot(cert, client.tcaCertPool); err != nil {
			client.Warningf("Failed verifing certificate against TCA cert pool [%s].", err.Error())
			// c. Check against ECA certPool, if this check also fails then return an error
			if _, err = primitives.CheckCertAgainRoot(cert, client.ecaCertPool); err != nil {
				client.Warningf("Failed verifing certificate against ECA cert pool [%s].", err.Error())

				return fmt.Errorf("Certificate has not been signed by a trusted authority. [%s]", err)
			}
		}

		// 2. Marshall tx without signature
		signature := tx.Signature
		tx.Signature = nil
		rawTx, err := proto.Marshal(tx)
		if err != nil {
			client.Errorf("Failed marshaling tx [%s].", err.Error())
			return err
		}
		tx.Signature = signature

		// 3. Verify signature
		ver, err := client.verify(cert.PublicKey, rawTx, tx.Signature)
		if err != nil {
			client.Errorf("Failed marshaling tx [%s].", err.Error())
			return err
		}

		if ver {
			return nil
		}

		return utils.ErrInvalidTransactionSignature
	}

	return utils.ErrTransactionMissingCert
}
예제 #2
0
// TransactionPreValidation verifies that the transaction is
// well formed with the respect to the security layer
// prescriptions (i.e. signature verification).
func (peer *peerImpl) TransactionPreValidation(tx *obc.Transaction) (*obc.Transaction, error) {
	if !peer.IsInitialized() {
		return nil, utils.ErrNotInitialized
	}

	//	peer.debug("Pre validating [%s].", tx.String())
	peer.Debugf("Tx confdential level [%s].", tx.ConfidentialityLevel.String())

	if tx.Cert != nil && tx.Signature != nil {
		// Verify the transaction
		// 1. Unmarshal cert
		cert, err := primitives.DERToX509Certificate(tx.Cert)
		if err != nil {
			peer.Errorf("TransactionPreExecution: failed unmarshalling cert [%s].", err.Error())
			return tx, err
		}

		// TODO: verify cert

		// 3. Marshall tx without signature
		signature := tx.Signature
		tx.Signature = nil
		rawTx, err := proto.Marshal(tx)
		if err != nil {
			peer.Errorf("TransactionPreExecution: failed marshaling tx [%s].", err.Error())
			return tx, err
		}
		tx.Signature = signature

		// 2. Verify signature
		ok, err := peer.verify(cert.PublicKey, rawTx, tx.Signature)
		if err != nil {
			peer.Errorf("TransactionPreExecution: failed marshaling tx [%s].", err.Error())
			return tx, err
		}

		if !ok {
			return tx, utils.ErrInvalidTransactionSignature
		}
	} else {
		if tx.Cert == nil {
			return tx, utils.ErrTransactionCertificate
		}

		if tx.Signature == nil {
			return tx, utils.ErrTransactionSignature
		}
	}

	return tx, nil
}
예제 #3
0
// CheckTransaction is used to verify that a transaction
// is well formed with the respect to the security layer
// prescriptions. To be used for internal verifications.
func (client *clientImpl) checkTransaction(tx *obc.Transaction) error {
	if !client.isInitialized {
		return utils.ErrNotInitialized
	}

	if tx.Cert == nil && tx.Signature == nil {
		return utils.ErrTransactionMissingCert
	}

	if tx.Cert != nil && tx.Signature != nil {
		// Verify the transaction
		// 1. Unmarshal cert
		cert, err := utils.DERToX509Certificate(tx.Cert)
		if err != nil {
			client.error("Failed unmarshalling cert [%s].", err.Error())
			return err
		}
		// TODO: verify cert

		// 3. Marshall tx without signature
		signature := tx.Signature
		tx.Signature = nil
		rawTx, err := proto.Marshal(tx)
		if err != nil {
			client.error("Failed marshaling tx [%s].", err.Error())
			return err
		}
		tx.Signature = signature

		// 2. Verify signature
		ver, err := client.verify(cert.PublicKey, rawTx, tx.Signature)
		if err != nil {
			client.error("Failed marshaling tx [%s].", err.Error())
			return err
		}

		if ver {
			return nil
		}

		return utils.ErrInvalidTransactionSignature
	}

	return utils.ErrTransactionMissingCert
}
func (client *clientImpl) encryptTxVersion1_1(tx *obc.Transaction) error {
	// client.enrollChainKey is an AES key represented as byte array
	enrollChainKey := client.enrollChainKey.([]byte)

	// Derive key
	txKey := primitives.HMAC(enrollChainKey, tx.Nonce)

	//	client.log.Info("Deriving from :", utils.EncodeBase64(client.node.enrollChainKey))
	//	client.log.Info("Nonce  ", utils.EncodeBase64(tx.Nonce))
	//	client.log.Info("Derived key  ", utils.EncodeBase64(txKey))

	// Encrypt Payload
	payloadKey := primitives.HMACAESTruncated(txKey, []byte{1})
	encryptedPayload, err := primitives.CBCPKCS7Encrypt(payloadKey, tx.Payload)
	if err != nil {
		return err
	}
	tx.Payload = encryptedPayload

	// Encrypt ChaincodeID
	chaincodeIDKey := primitives.HMACAESTruncated(txKey, []byte{2})
	encryptedChaincodeID, err := primitives.CBCPKCS7Encrypt(chaincodeIDKey, tx.ChaincodeID)
	if err != nil {
		return err
	}
	tx.ChaincodeID = encryptedChaincodeID

	// Encrypt Metadata
	if len(tx.Metadata) != 0 {
		metadataKey := primitives.HMACAESTruncated(txKey, []byte{3})
		encryptedMetadata, err := primitives.CBCPKCS7Encrypt(metadataKey, tx.Metadata)
		if err != nil {
			return err
		}
		tx.Metadata = encryptedMetadata
	}

	return nil
}
예제 #5
0
func (client *clientImpl) encryptTxVersion1_2(tx *obc.Transaction) error {
	// Create (PK_C,SK_C) pair
	ccPrivateKey, err := client.eciesSPI.NewPrivateKey(rand.Reader, primitives.GetDefaultCurve())
	if err != nil {
		client.Errorf("Failed generate chaincode keypair: [%s]", err)

		return err
	}

	// Prepare message to the validators
	var (
		stateKey  []byte
		privBytes []byte
	)

	switch tx.Type {
	case obc.Transaction_CHAINCODE_DEPLOY:
		// Prepare chaincode stateKey and privateKey
		stateKey, err = primitives.GenAESKey()
		if err != nil {
			client.Errorf("Failed creating state key: [%s]", err)

			return err
		}

		privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey)
		if err != nil {
			client.Errorf("Failed serializing chaincode key: [%s]", err)

			return err
		}

		break
	case obc.Transaction_CHAINCODE_QUERY:
		// Prepare chaincode stateKey and privateKey
		stateKey = primitives.HMACAESTruncated(client.queryStateKey, append([]byte{6}, tx.Nonce...))

		privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey)
		if err != nil {
			client.Errorf("Failed serializing chaincode key: [%s]", err)

			return err
		}

		break
	case obc.Transaction_CHAINCODE_INVOKE:
		// Prepare chaincode stateKey and privateKey
		stateKey = make([]byte, 0)

		privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey)
		if err != nil {
			client.Errorf("Failed serializing chaincode key: [%s]", err)

			return err
		}
		break
	}

	// Encrypt message to the validators
	cipher, err := client.eciesSPI.NewAsymmetricCipherFromPublicKey(client.chainPublicKey)
	if err != nil {
		client.Errorf("Failed creating new encryption scheme: [%s]", err)

		return err
	}

	msgToValidators, err := asn1.Marshal(chainCodeValidatorMessage1_2{privBytes, stateKey})
	if err != nil {
		client.Errorf("Failed preparing message to the validators: [%s]", err)

		return err
	}

	encMsgToValidators, err := cipher.Process(msgToValidators)
	if err != nil {
		client.Errorf("Failed encrypting message to the validators: [%s]", err)

		return err
	}
	tx.ToValidators = encMsgToValidators

	// Encrypt the rest of the fields

	// Init with chainccode pk
	cipher, err = client.eciesSPI.NewAsymmetricCipherFromPublicKey(ccPrivateKey.GetPublicKey())
	if err != nil {
		client.Errorf("Failed initiliazing encryption scheme: [%s]", err)

		return err
	}

	// Encrypt chaincodeID using pkC
	encryptedChaincodeID, err := cipher.Process(tx.ChaincodeID)
	if err != nil {
		client.Errorf("Failed encrypting chaincodeID: [%s]", err)

		return err
	}
	tx.ChaincodeID = encryptedChaincodeID

	// Encrypt payload using pkC
	encryptedPayload, err := cipher.Process(tx.Payload)
	if err != nil {
		client.Errorf("Failed encrypting payload: [%s]", err)

		return err
	}
	tx.Payload = encryptedPayload

	// Encrypt metadata using pkC
	if len(tx.Metadata) != 0 {
		encryptedMetadata, err := cipher.Process(tx.Metadata)
		if err != nil {
			client.Errorf("Failed encrypting metadata: [%s]", err)

			return err
		}
		tx.Metadata = encryptedMetadata
	}

	return nil
}
예제 #6
0
// TransactionPreValidation verifies that the transaction is
// well formed with the respect to the security layer
// prescriptions (i.e. signature verification).
func (peer *peerImpl) TransactionPreValidation(tx *obc.Transaction) (*obc.Transaction, error) {
	if !peer.IsInitialized() {
		return nil, utils.ErrNotInitialized
	}

	//	peer.debug("Pre validating [%s].", tx.String())
	peer.Debugf("Tx confdential level [%s].", tx.ConfidentialityLevel.String())

	if tx.Cert != nil && tx.Signature != nil {
		// Verify the transaction
		// 1. Unmarshal cert
		cert, err := primitives.DERToX509Certificate(tx.Cert)
		if err != nil {
			peer.Errorf("TransactionPreExecution: failed unmarshalling cert [%s].", err.Error())
			return tx, err
		}

		// Verify transaction certificate against root
		// DER to x509
		x509Cert, err := primitives.DERToX509Certificate(tx.Cert)
		if err != nil {
			peer.Debugf("Failed parsing certificate [% x]: [%s].", tx.Cert, err)

			return tx, err
		}

		// 1. Get rid of the extensions that cannot be checked now
		x509Cert.UnhandledCriticalExtensions = nil
		// 2. Check against TCA certPool
		if _, err = primitives.CheckCertAgainRoot(x509Cert, peer.tcaCertPool); err != nil {
			peer.Warningf("Failed verifing certificate against TCA cert pool [%s].", err.Error())
			// 3. Check against ECA certPool, if this check also fails then return an error
			if _, err = primitives.CheckCertAgainRoot(x509Cert, peer.ecaCertPool); err != nil {
				peer.Warningf("Failed verifing certificate against ECA cert pool [%s].", err.Error())

				return tx, fmt.Errorf("Certificate has not been signed by a trusted authority. [%s]", err)
			}
		}

		// 3. Marshall tx without signature
		signature := tx.Signature
		tx.Signature = nil
		rawTx, err := proto.Marshal(tx)
		if err != nil {
			peer.Errorf("TransactionPreExecution: failed marshaling tx [%s].", err.Error())
			return tx, err
		}
		tx.Signature = signature

		// 2. Verify signature
		ok, err := peer.verify(cert.PublicKey, rawTx, tx.Signature)
		if err != nil {
			peer.Errorf("TransactionPreExecution: failed marshaling tx [%s].", err.Error())
			return tx, err
		}

		if !ok {
			return tx, utils.ErrInvalidTransactionSignature
		}
	} else {
		if tx.Cert == nil {
			return tx, utils.ErrTransactionCertificate
		}

		if tx.Signature == nil {
			return tx, utils.ErrTransactionSignature
		}
	}

	return tx, nil
}