// 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.debug("Tx confdential level [%s].", tx.ConfidentialityLevel.String())
if tx.Cert != nil && tx.Signature != nil {
// Verify the transaction
// 1. Unmarshal cert
cert, err := utils.DERToX509Certificate(tx.Cert)
if err != nil {
peer.error("TransactionPreExecution: failed unmarshalling cert [%s] [%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.error("TransactionPreExecution: failed marshaling tx [%s] [%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.error("TransactionPreExecution: failed marshaling tx [%s] [%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
}
// 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.node.log.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.node.log.Error("Failed marshaling tx [%s].", err.Error())
return err
}
tx.Signature = signature
// 2. Verify signature
ver, err := client.node.verify(cert.PublicKey, rawTx, tx.Signature)
if err != nil {
client.node.log.Error("Failed marshaling tx [%s].", err.Error())
return err
}
if ver {
return nil
}
return utils.ErrInvalidTransactionSignature
}
return utils.ErrTransactionMissingCert
}
func (client *clientImpl) encryptTx(tx *obc.Transaction) error {
if len(tx.Nonce) == 0 {
return errors.New("Failed encrypting payload. Invalid nonce.")
}
// Derive key
txKey := utils.HMAC(client.node.enrollChainKey, tx.Nonce)
// client.node.log.Info("Deriving from :", utils.EncodeBase64(client.node.enrollChainKey))
// client.node.log.Info("Nonce ", utils.EncodeBase64(tx.Nonce))
// client.node.log.Info("Derived key ", utils.EncodeBase64(txKey))
// Encrypt Payload
payloadKey := utils.HMACTruncated(txKey, []byte{1}, utils.AESKeyLength)
encryptedPayload, err := utils.CBCPKCS7Encrypt(payloadKey, tx.Payload)
if err != nil {
return err
}
tx.Payload = encryptedPayload
// Encrypt ChaincodeID
chaincodeIDKey := utils.HMACTruncated(txKey, []byte{2}, utils.AESKeyLength)
encryptedChaincodeID, err := utils.CBCPKCS7Encrypt(chaincodeIDKey, tx.ChaincodeID)
if err != nil {
return err
}
tx.ChaincodeID = encryptedChaincodeID
// Encrypt Metadata
if len(tx.Metadata) != 0 {
metadataKey := utils.HMACTruncated(txKey, []byte{3}, utils.AESKeyLength)
encryptedMetadata, err := utils.CBCPKCS7Encrypt(metadataKey, tx.Metadata)
if err != nil {
return err
}
tx.Metadata = encryptedMetadata
}
client.node.log.Debug("Encrypted ChaincodeID [%s].", utils.EncodeBase64(tx.ChaincodeID))
client.node.log.Debug("Encrypted Payload [%s].", utils.EncodeBase64(tx.Payload))
client.node.log.Debug("Encrypted Metadata [%s].", utils.EncodeBase64(tx.Metadata))
return nil
}
// TransactionPreValidation verifies that the transaction is
// well formed with the respect to the security layer
// prescriptions (i.e. signature verification). If this is the case,
// the method prepares the transaction to be executed.
func (validator *validatorImpl) TransactionPreExecution(tx *obc.Transaction) (*obc.Transaction, error) {
if !validator.isInitialized {
return nil, utils.ErrNotInitialized
}
validator.peer.node.log.Debug("Pre executing [%s].", tx.String())
validator.peer.node.log.Debug("Tx confdential level [%s].", tx.ConfidentialityLevel.String())
switch tx.ConfidentialityLevel {
case obc.ConfidentialityLevel_PUBLIC:
validator.peer.node.log.Debug("Deep cloning.")
// Nothing to do here. Clone tx.
clone, err := validator.deepCloneTransaction(tx)
if err != nil {
validator.peer.node.log.Error("Failed deep cloning [%s].", err.Error())
return nil, err
}
return clone, nil
case obc.ConfidentialityLevel_CONFIDENTIAL:
validator.peer.node.log.Debug("Clone and Decrypt.")
// Clone the transaction and decrypt it
newTx, err := validator.decryptTx(tx)
if err != nil {
validator.peer.node.log.Error("Failed decrypting [%s].", err.Error())
return nil, err
}
// TODO: Validate confidentiality level. Must be the same on tx and newTx.Spec
return newTx, nil
default:
return nil, utils.ErrInvalidConfidentialityLevel
}
}
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 := utils.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 := utils.HMACTruncated(txKey, []byte{1}, utils.AESKeyLength)
encryptedPayload, err := utils.CBCPKCS7Encrypt(payloadKey, tx.Payload)
if err != nil {
return err
}
tx.Payload = encryptedPayload
// Encrypt ChaincodeID
chaincodeIDKey := utils.HMACTruncated(txKey, []byte{2}, utils.AESKeyLength)
encryptedChaincodeID, err := utils.CBCPKCS7Encrypt(chaincodeIDKey, tx.ChaincodeID)
if err != nil {
return err
}
tx.ChaincodeID = encryptedChaincodeID
// Encrypt Metadata
if len(tx.Metadata) != 0 {
metadataKey := utils.HMACTruncated(txKey, []byte{3}, utils.AESKeyLength)
encryptedMetadata, err := utils.CBCPKCS7Encrypt(metadataKey, tx.Metadata)
if err != nil {
return err
}
tx.Metadata = encryptedMetadata
}
return nil
}
func (client *clientImpl) encryptTx(tx *obc.Transaction) error {
if tx.Nonce == nil || len(tx.Nonce) == 0 {
return errors.New("Failed encrypting payload. Invalid nonce.")
}
// Derive key
txKey := utils.HMAC(client.node.enrollChainKey, tx.Nonce)
// client.node.log.Info("Deriving from :", utils.EncodeBase64(client.node.enrollChainKey))
// client.node.log.Info("Nonce ", utils.EncodeBase64(tx.Nonce))
// client.node.log.Info("Derived key ", utils.EncodeBase64(txKey))
// Encrypt using the derived key
payloadKey := utils.HMACTruncated(txKey, []byte{1}, utils.AESKeyLength)
encryptedPayload, err := utils.CBCPKCS7Encrypt(payloadKey, tx.Payload)
if err != nil {
return err
}
tx.EncryptedPayload = encryptedPayload
tx.Payload = nil
chaincodeIDKey := utils.HMACTruncated(txKey, []byte{2}, utils.AESKeyLength)
rawChaincodeID, err := proto.Marshal(tx.ChaincodeID)
if err != nil {
return err
}
tx.EncryptedChaincodeID, err = utils.CBCPKCS7Encrypt(chaincodeIDKey, rawChaincodeID)
if err != nil {
return err
}
tx.ChaincodeID = nil
client.node.log.Debug("Encrypted Payload [%s].", utils.EncodeBase64(tx.EncryptedPayload))
client.node.log.Debug("Encrypted ChaincodeID [%s].", utils.EncodeBase64(tx.EncryptedChaincodeID))
return nil
}
func (client *clientImpl) encryptTxVersion1_2(tx *obc.Transaction) error {
// Create (PK_C,SK_C) pair
ccPrivateKey, err := client.eciesSPI.NewPrivateKey(rand.Reader, conf.GetDefaultCurve())
if err != nil {
client.error("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_NEW:
// Prepare chaincode stateKey and privateKey
stateKey, err = utils.GenAESKey()
if err != nil {
client.error("Failed creating state key: [%s]", err)
return err
}
privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey)
if err != nil {
client.error("Failed serializing chaincode key: [%s]", err)
return err
}
break
case obc.Transaction_CHAINCODE_QUERY:
// Prepare chaincode stateKey and privateKey
stateKey = utils.HMACTruncated(client.queryStateKey, append([]byte{6}, tx.Nonce...), utils.AESKeyLength)
privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey)
if err != nil {
client.error("Failed serializing chaincode key: [%s]", err)
return err
}
break
case obc.Transaction_CHAINCODE_EXECUTE:
// Prepare chaincode stateKey and privateKey
stateKey = make([]byte, 0)
privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey)
if err != nil {
client.error("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.error("Failed creating new encryption scheme: [%s]", err)
return err
}
msgToValidators, err := asn1.Marshal(chainCodeValidatorMessage1_2{privBytes, stateKey})
if err != nil {
client.error("Failed preparing message to the validators: [%s]", err)
return err
}
encMsgToValidators, err := cipher.Process(msgToValidators)
if err != nil {
client.error("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.error("Failed initiliazing encryption scheme: [%s]", err)
return err
}
// Encrypt chaincodeID using pkC
encryptedChaincodeID, err := cipher.Process(tx.ChaincodeID)
if err != nil {
client.error("Failed encrypting chaincodeID: [%s]", err)
return err
}
tx.ChaincodeID = encryptedChaincodeID
// Encrypt payload using pkC
encryptedPayload, err := cipher.Process(tx.Payload)
if err != nil {
client.error("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.error("Failed encrypting metadata: [%s]", err)
return err
}
tx.Metadata = encryptedMetadata
}
return nil
}
func getAuthorisedAddresses(tx *protos.Transaction) ([]string, *protos.ChaincodeID) {
// TODO fetch address from chaincode deployment tx
return []string{"address1", "address2"}, tx.GetChaincodeID()
}