peer_impl.go

/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
*/

package crypto

import (
	"github.com/golang/protobuf/proto"
	"github.com/openblockchain/obc-peer/openchain/crypto/utils"
	obc "github.com/openblockchain/obc-peer/protos"
)

type peerImpl struct {
	node *nodeImpl

	isInitialized bool
}

// Public methods

func (peer *peerImpl) GetName() string {
	return peer.node.GetName()
}

// GetID returns this peer's identifier
func (peer *peerImpl) GetID() []byte {
	return utils.Clone(peer.node.id)
}

// GetEnrollmentID returns this peer's enroolment id
func (peer *peerImpl) GetEnrollmentID() string {
	return peer.node.enrollID
}

// 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.node.log.Debug("Pre validating [%s].", tx.String())
	peer.node.log.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.node.log.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.node.log.Error("TransactionPreExecution: failed marshaling tx [%s] [%s].", err.Error())
			return tx, err
		}
		tx.Signature = signature

		// 2. Verify signature
		ok, err := peer.node.verify(cert.PublicKey, rawTx, tx.Signature)
		if err != nil {
			peer.node.log.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
}

// 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 (peer *peerImpl) TransactionPreExecution(tx *obc.Transaction) (*obc.Transaction, error) {
	return nil, utils.ErrNotImplemented
}

// Sign signs msg with this validator's signing key and outputs
// the signature if no error occurred.
func (peer *peerImpl) Sign(msg []byte) ([]byte, error) {
	return nil, utils.ErrNotImplemented
}

// Verify checks that signature if a valid signature of message under vkID's verification key.
// If the verification succeeded, Verify returns nil meaning no error occurred.
// If vkID is nil, then the signature is verified against this validator's verification key.
func (peer *peerImpl) Verify(vkID, signature, message []byte) error {
	return utils.ErrNotImplemented
}

func (peer *peerImpl) GetStateEncryptor(deployTx, invokeTx *obc.Transaction) (StateEncryptor, error) {
	return nil, utils.ErrNotImplemented
}

// Private methods

func (peer *peerImpl) register(prefix, name string, pwd []byte, enrollID, enrollPWD string) error {
	if peer.isInitialized {
		peer.node.log.Error("Registering [%s]...done! Initialization already performed", enrollID)

		return utils.ErrAlreadyInitialized
	}

	// Register node
	node := new(nodeImpl)
	if err := node.register(prefix, name, pwd, enrollID, enrollPWD); err != nil {
		log.Error("Failed registering [%s]: [%s]", enrollID, err)
		return err
	}

	peer.node = node

	return nil
}

func (peer *peerImpl) init(prefix, id string, pwd []byte) error {
	if peer.isInitialized {
		peer.node.log.Error("Already initializaed.")

		return utils.ErrAlreadyInitialized
	}

	// Register node
	var node *nodeImpl
	if peer.node != nil {
		node = peer.node
	} else {
		node = new(nodeImpl)
	}
	if err := node.init(prefix, id, pwd); err != nil {
		return err
	}
	peer.node = node

	// initialized
	peer.isInitialized = true

	peer.node.log.Info("Initialization...done.")
	return nil
}

func (peer *peerImpl) close() error {
	if peer.node != nil {
		return peer.node.close()
	}
	return nil
}