Beispiel #1
0
// ReadCertAttribute returns the value specified by `attributeName` from the transaction tCert.
func (stub *ChaincodeStub) ReadCertAttribute(attributeName string) ([]byte, error) {
	tcertder := stub.securityContext.CallerCert
	tcert, err := utils.DERToX509Certificate(tcertder)
	if err != nil {
		return nil, err
	}

	var headerRaw []byte
	if headerRaw, err = utils.GetCriticalExtension(tcert, utils.TCertAttributesHeaders); err != nil {
		return nil, err
	}

	headerStr := string(headerRaw)
	var header map[string]int
	header, err = stub.parseHeader(headerStr)

	if err != nil {
		return nil, err
	}

	position := header[attributeName]

	if position == 0 {
		return nil, errors.New("Failed attribute doesn't exists in the TCert.")
	}

	oid := asn1.ObjectIdentifier{1, 2, 3, 4, 5, 6, 9 + position}

	var value []byte
	if value, err = utils.GetCriticalExtension(tcert, oid); err != nil {
		return nil, err
	}
	return value, nil
}
Beispiel #2
0
// CertAttributes returns all the attributes stored in the transaction tCert.
func (stub *ChaincodeStub) CertAttributes() ([]string, error) {
	tcertder := stub.securityContext.CallerCert
	tcert, err := utils.DERToX509Certificate(tcertder)
	if err != nil {
		return nil, err
	}

	var headerRaw []byte
	if headerRaw, err = utils.GetCriticalExtension(tcert, utils.TCertAttributesHeaders); err != nil {
		return nil, err
	}

	headerStr := string(headerRaw)
	var header map[string]int
	header, err = stub.parseHeader(headerStr)

	if err != nil {
		return nil, err
	}

	attributes := make([]string, len(header))
	count := 0
	for k := range header {
		attributes[count] = k
		count++
	}
	return attributes, nil
}
Beispiel #3
0
func (client *clientImpl) getTCertFromExternalDER(der []byte) (tCert, error) {
	// DER to x509
	x509Cert, err := utils.DERToX509Certificate(der)
	if err != nil {
		client.debug("Failed parsing certificate [% x]: [%s].", der, err)

		return nil, err
	}

	// Handle Critical Extension TCertEncTCertIndex
	if _, err = utils.GetCriticalExtension(x509Cert, utils.TCertEncTCertIndex); err != nil {
		client.error("Failed getting extension TCERT_ENC_TCERTINDEX [% x]: [%s].", der, err)

		return nil, err
	}

	// Handle Critical Extension TCertEncEnrollmentID TODO validate encEnrollmentID
	_, err = utils.GetCriticalExtension(x509Cert, utils.TCertEncEnrollmentID)
	if err != nil {
		client.error("Failed getting extension TCERT_ENC_ENROLLMENT_ID [%s].", err.Error())

		return nil, err
	}

	// Handle Critical Extension TCertAttributes
	//	for i := 0; i < len(x509Cert.Extensions) - 2; i++ {
	//		attributeExtensionIdentifier := append(utils.TCertEncAttributesBase, i + 9)
	//		_ , err = utils.GetCriticalExtension(x509Cert, attributeExtensionIdentifier)
	//		if err != nil {
	//			client.error("Failed getting extension TCERT_ATTRIBUTE_%s [%s].", i, err.Error())
	//
	//			return nil, err
	//		}
	//	}

	// Verify certificate against root
	if _, err := utils.CheckCertAgainRoot(x509Cert, client.tcaCertPool); err != nil {
		client.warning("Warning verifing certificate [% x]: [%s].", der, err)

		return nil, err
	}

	return &tCertImpl{client, x509Cert, nil}, nil
}
Beispiel #4
0
// Read the attribute with name 'attributeName' from the der encoded x509.Certificate 'tcertder'.
func (client *clientImpl) ReadAttribute(attributeName string, tcertder []byte) ([]byte, error) {
	tcert, err := utils.DERToX509Certificate(tcertder)
	if err != nil {
		client.debug("Failed parsing certificate [% x]: [%s].", tcertder, err)

		return nil, err
	}

	var headerRaw []byte
	if headerRaw, err = utils.GetCriticalExtension(tcert, utils.TCertAttributesHeaders); err != nil {
		client.error("Failed getting extension TCERT_ATTRIBUTES_HEADER [% x]: [%s].", tcertder, err)

		return nil, err
	}

	headerStr := string(headerRaw)
	var header map[string]int
	header, err = client.parseHeader(headerStr)

	if err != nil {
		return nil, err
	}

	position := header[attributeName]

	if position == 0 {
		return nil, errors.New("Failed attribute doesn't exists in the TCert.")
	}

	oid := asn1.ObjectIdentifier{1, 2, 3, 4, 5, 6, 9 + position}

	var value []byte
	if value, err = utils.GetCriticalExtension(tcert, oid); err != nil {
		client.error("Failed getting extension Attribute Value [% x]: [%s].", tcertder, err)
		return nil, err
	}

	return value, nil
}
Beispiel #5
0
func (peer *peerImpl) getEnrollmentCertByHashFromECA(id []byte) ([]byte, []byte, error) {
	// Prepare the request
	peer.debug("Reading certificate for hash [% x]", id)

	req := &membersrvc.Hash{Hash: id}
	response, err := peer.callECAReadCertificateByHash(context.Background(), req)
	if err != nil {
		peer.error("Failed requesting enrollment certificate [%s].", err.Error())

		return nil, nil, err
	}

	peer.debug("Certificate for hash [% x] = [% x][% x]", id, response.Sign, response.Enc)

	// Verify response.Sign
	x509Cert, err := utils.DERToX509Certificate(response.Sign)
	if err != nil {
		peer.error("Failed parsing signing enrollment certificate for encrypting: [%s]", err)

		return nil, nil, err
	}

	// Check role
	roleRaw, err := utils.GetCriticalExtension(x509Cert, ECertSubjectRole)
	if err != nil {
		peer.error("Failed parsing ECertSubjectRole in enrollment certificate for signing: [%s]", err)

		return nil, nil, err
	}

	role, err := strconv.ParseInt(string(roleRaw), 10, len(roleRaw)*8)
	if err != nil {
		peer.error("Failed parsing ECertSubjectRole in enrollment certificate for signing: [%s]", err)

		return nil, nil, err
	}

	if membersrvc.Role(role) != membersrvc.Role_VALIDATOR && membersrvc.Role(role) != membersrvc.Role_PEER {
		peer.error("Invalid ECertSubjectRole in enrollment certificate for signing. Not a validator or peer: [%s]", err)

		return nil, nil, err
	}

	return response.Sign, response.Enc, nil
}
Beispiel #6
0
func (client *clientImpl) getTCertsFromTCA(num int) error {
	client.debug("Get [%d] certificates from the TCA...", num)

	// Contact the TCA
	TCertOwnerKDFKey, certDERs, err := client.callTCACreateCertificateSet(num)
	if err != nil {
		client.debug("Failed contacting TCA [%s].", err.Error())

		return err
	}

	//	client.debug("TCertOwnerKDFKey [%s].", utils.EncodeBase64(TCertOwnerKDFKey))

	// Store TCertOwnerKDFKey and checks that every time it is always the same key
	if client.tCertOwnerKDFKey != nil {
		// Check that the keys are the same
		equal := bytes.Equal(client.tCertOwnerKDFKey, TCertOwnerKDFKey)
		if !equal {
			return errors.New("Failed reciving kdf key from TCA. The keys are different.")
		}
	} else {
		client.tCertOwnerKDFKey = TCertOwnerKDFKey

		// TODO: handle this situation more carefully
		if err := client.storeTCertOwnerKDFKey(); err != nil {
			client.error("Failed storing TCertOwnerKDFKey [%s].", err.Error())

			return err
		}
	}

	// Validate the Certificates obtained

	TCertOwnerEncryptKey := primitives.HMACAESTruncated(client.tCertOwnerKDFKey, []byte{1})
	ExpansionKey := primitives.HMAC(client.tCertOwnerKDFKey, []byte{2})

	j := 0
	for i := 0; i < num; i++ {
		// DER to x509
		x509Cert, err := utils.DERToX509Certificate(certDERs[i].Cert)
		if err != nil {
			client.debug("Failed parsing certificate [% x]: [%s].", certDERs[i].Cert, err)

			continue
		}

		// Handle Critical Extenstion TCertEncTCertIndex
		tCertIndexCT, err := utils.GetCriticalExtension(x509Cert, utils.TCertEncTCertIndex)
		if err != nil {
			client.error("Failed getting extension TCERT_ENC_TCERTINDEX [% x]: [%s].", err)

			continue
		}

		// Verify certificate against root
		if _, err := utils.CheckCertAgainRoot(x509Cert, client.tcaCertPool); err != nil {
			client.warning("Warning verifing certificate [%s].", err.Error())

			continue
		}

		// Verify public key

		// 384-bit ExpansionValue = HMAC(Expansion_Key, TCertIndex)
		// Let TCertIndex = Timestamp, RandValue, 1,2,…
		// Timestamp assigned, RandValue assigned and counter reinitialized to 1 per batch

		// Decrypt ct to TCertIndex (TODO: || EnrollPub_Key || EnrollID ?)
		pt, err := primitives.CBCPKCS7Decrypt(TCertOwnerEncryptKey, tCertIndexCT)
		if err != nil {
			client.error("Failed decrypting extension TCERT_ENC_TCERTINDEX [%s].", err.Error())

			continue
		}

		// Compute ExpansionValue based on TCertIndex
		TCertIndex := pt
		//		TCertIndex := []byte(strconv.Itoa(i))

		client.debug("TCertIndex: [% x].", TCertIndex)
		mac := hmac.New(primitives.NewHash, ExpansionKey)
		mac.Write(TCertIndex)
		ExpansionValue := mac.Sum(nil)

		// Derive tpk and tsk accordingly to ExapansionValue from enrollment pk,sk
		// Computable by TCA / Auditor: TCertPub_Key = EnrollPub_Key + ExpansionValue G
		// using elliptic curve point addition per NIST FIPS PUB 186-4- specified P-384

		// Compute temporary secret key
		tempSK := &ecdsa.PrivateKey{
			PublicKey: ecdsa.PublicKey{
				Curve: client.enrollPrivKey.Curve,
				X:     new(big.Int),
				Y:     new(big.Int),
			},
			D: new(big.Int),
		}

		var k = new(big.Int).SetBytes(ExpansionValue)
		var one = new(big.Int).SetInt64(1)
		n := new(big.Int).Sub(client.enrollPrivKey.Params().N, one)
		k.Mod(k, n)
		k.Add(k, one)

		tempSK.D.Add(client.enrollPrivKey.D, k)
		tempSK.D.Mod(tempSK.D, client.enrollPrivKey.PublicKey.Params().N)

		// Compute temporary public key
		tempX, tempY := client.enrollPrivKey.PublicKey.ScalarBaseMult(k.Bytes())
		tempSK.PublicKey.X, tempSK.PublicKey.Y =
			tempSK.PublicKey.Add(
				client.enrollPrivKey.PublicKey.X, client.enrollPrivKey.PublicKey.Y,
				tempX, tempY,
			)

		// Verify temporary public key is a valid point on the reference curve
		isOn := tempSK.Curve.IsOnCurve(tempSK.PublicKey.X, tempSK.PublicKey.Y)
		if !isOn {
			client.error("Failed temporary public key IsOnCurve check.")

			continue
		}

		// Check that the derived public key is the same as the one in the certificate
		certPK := x509Cert.PublicKey.(*ecdsa.PublicKey)

		if certPK.X.Cmp(tempSK.PublicKey.X) != 0 {
			client.error("Derived public key is different on X")

			continue
		}

		if certPK.Y.Cmp(tempSK.PublicKey.Y) != 0 {
			client.error("Derived public key is different on Y")

			continue
		}

		// Verify the signing capability of tempSK
		err = primitives.VerifySignCapability(tempSK, x509Cert.PublicKey)
		if err != nil {
			client.error("Failed verifing signing capability [%s].", err.Error())

			continue
		}

		// Marshall certificate and secret key to be stored in the database
		if err != nil {
			client.error("Failed marshalling private key [%s].", err.Error())

			continue
		}

		if err := utils.CheckCertPKAgainstSK(x509Cert, interface{}(tempSK)); err != nil {
			client.error("Failed checking TCA cert PK against private key [%s].", err.Error())

			continue
		}

		client.debug("Sub index [%d]", j)
		j++
		client.debug("Certificate [%d] validated.", i)

		client.tCertPool.AddTCert(&tCertImpl{client, x509Cert, tempSK})
	}

	if j == 0 {
		client.error("No valid TCert was sent")

		return errors.New("No valid TCert was sent.")
	}

	return nil
}
Beispiel #7
0
func (client *clientImpl) getTCertFromDER(der []byte) (tCert tCert, err error) {
	if client.tCertOwnerKDFKey == nil {
		return nil, fmt.Errorf("KDF key not initialized yet")
	}

	TCertOwnerEncryptKey := primitives.HMACAESTruncated(client.tCertOwnerKDFKey, []byte{1})
	ExpansionKey := primitives.HMAC(client.tCertOwnerKDFKey, []byte{2})

	// DER to x509
	x509Cert, err := utils.DERToX509Certificate(der)
	if err != nil {
		client.debug("Failed parsing certificate [% x]: [%s].", der, err)

		return
	}

	// Handle Critical Extenstion TCertEncTCertIndex
	tCertIndexCT, err := utils.GetCriticalExtension(x509Cert, utils.TCertEncTCertIndex)
	if err != nil {
		client.error("Failed getting extension TCERT_ENC_TCERTINDEX [%s].", err.Error())

		return
	}

	// Verify certificate against root
	if _, err = utils.CheckCertAgainRoot(x509Cert, client.tcaCertPool); err != nil {
		client.warning("Warning verifing certificate [%s].", err.Error())

		return
	}

	// Verify public key

	// 384-bit ExpansionValue = HMAC(Expansion_Key, TCertIndex)
	// Let TCertIndex = Timestamp, RandValue, 1,2,…
	// Timestamp assigned, RandValue assigned and counter reinitialized to 1 per batch

	// Decrypt ct to TCertIndex (TODO: || EnrollPub_Key || EnrollID ?)
	pt, err := primitives.CBCPKCS7Decrypt(TCertOwnerEncryptKey, tCertIndexCT)
	if err != nil {
		client.error("Failed decrypting extension TCERT_ENC_TCERTINDEX [%s].", err.Error())

		return
	}

	// Compute ExpansionValue based on TCertIndex
	TCertIndex := pt
	//		TCertIndex := []byte(strconv.Itoa(i))

	client.debug("TCertIndex: [% x].", TCertIndex)
	mac := hmac.New(primitives.NewHash, ExpansionKey)
	mac.Write(TCertIndex)
	ExpansionValue := mac.Sum(nil)

	// Derive tpk and tsk accordingly to ExapansionValue from enrollment pk,sk
	// Computable by TCA / Auditor: TCertPub_Key = EnrollPub_Key + ExpansionValue G
	// using elliptic curve point addition per NIST FIPS PUB 186-4- specified P-384

	// Compute temporary secret key
	tempSK := &ecdsa.PrivateKey{
		PublicKey: ecdsa.PublicKey{
			Curve: client.enrollPrivKey.Curve,
			X:     new(big.Int),
			Y:     new(big.Int),
		},
		D: new(big.Int),
	}

	var k = new(big.Int).SetBytes(ExpansionValue)
	var one = new(big.Int).SetInt64(1)
	n := new(big.Int).Sub(client.enrollPrivKey.Params().N, one)
	k.Mod(k, n)
	k.Add(k, one)

	tempSK.D.Add(client.enrollPrivKey.D, k)
	tempSK.D.Mod(tempSK.D, client.enrollPrivKey.PublicKey.Params().N)

	// Compute temporary public key
	tempX, tempY := client.enrollPrivKey.PublicKey.ScalarBaseMult(k.Bytes())
	tempSK.PublicKey.X, tempSK.PublicKey.Y =
		tempSK.PublicKey.Add(
			client.enrollPrivKey.PublicKey.X, client.enrollPrivKey.PublicKey.Y,
			tempX, tempY,
		)

	// Verify temporary public key is a valid point on the reference curve
	isOn := tempSK.Curve.IsOnCurve(tempSK.PublicKey.X, tempSK.PublicKey.Y)
	if !isOn {
		client.error("Failed temporary public key IsOnCurve check.")

		return nil, fmt.Errorf("Failed temporary public key IsOnCurve check.")
	}

	// Check that the derived public key is the same as the one in the certificate
	certPK := x509Cert.PublicKey.(*ecdsa.PublicKey)

	if certPK.X.Cmp(tempSK.PublicKey.X) != 0 {
		client.error("Derived public key is different on X")

		return nil, fmt.Errorf("Derived public key is different on X")
	}

	if certPK.Y.Cmp(tempSK.PublicKey.Y) != 0 {
		client.error("Derived public key is different on Y")

		return nil, fmt.Errorf("Derived public key is different on Y")
	}

	// Verify the signing capability of tempSK
	err = primitives.VerifySignCapability(tempSK, x509Cert.PublicKey)
	if err != nil {
		client.error("Failed verifing signing capability [%s].", err.Error())

		return
	}

	// Marshall certificate and secret key to be stored in the database
	if err != nil {
		client.error("Failed marshalling private key [%s].", err.Error())

		return
	}

	if err = utils.CheckCertPKAgainstSK(x509Cert, interface{}(tempSK)); err != nil {
		client.error("Failed checking TCA cert PK against private key [%s].", err.Error())

		return
	}

	tCert = &tCertImpl{client, x509Cert, tempSK}

	return
}
Beispiel #8
0
func (node *nodeImpl) getEnrollmentCertificateFromECA(id, pw string) (interface{}, []byte, []byte, error) {
	// Get a new ECA Client
	sock, ecaP, err := node.getECAClient()
	defer sock.Close()

	// Run the protocol

	signPriv, err := primitives.NewECDSAKey()
	if err != nil {
		node.error("Failed generating ECDSA key [%s].", err.Error())

		return nil, nil, nil, err
	}
	signPub, err := x509.MarshalPKIXPublicKey(&signPriv.PublicKey)
	if err != nil {
		node.error("Failed mashalling ECDSA key [%s].", err.Error())

		return nil, nil, nil, err
	}

	encPriv, err := primitives.NewECDSAKey()
	if err != nil {
		node.error("Failed generating Encryption key [%s].", err.Error())

		return nil, nil, nil, err
	}
	encPub, err := x509.MarshalPKIXPublicKey(&encPriv.PublicKey)
	if err != nil {
		node.error("Failed marshalling Encryption key [%s].", err.Error())

		return nil, nil, nil, err
	}

	req := &membersrvc.ECertCreateReq{
		Ts:   &protobuf.Timestamp{Seconds: time.Now().Unix(), Nanos: 0},
		Id:   &membersrvc.Identity{Id: id},
		Tok:  &membersrvc.Token{Tok: []byte(pw)},
		Sign: &membersrvc.PublicKey{Type: membersrvc.CryptoType_ECDSA, Key: signPub},
		Enc:  &membersrvc.PublicKey{Type: membersrvc.CryptoType_ECDSA, Key: encPub},
		Sig:  nil}

	resp, err := ecaP.CreateCertificatePair(context.Background(), req)
	if err != nil {
		node.error("Failed invoking CreateCertficatePair [%s].", err.Error())

		return nil, nil, nil, err
	}

	//out, err := rsa.DecryptPKCS1v15(rand.Reader, encPriv, resp.Tok.Tok)
	spi := ecies.NewSPI()
	eciesKey, err := spi.NewPrivateKey(nil, encPriv)
	if err != nil {
		node.error("Failed parsing decrypting key [%s].", err.Error())

		return nil, nil, nil, err
	}

	ecies, err := spi.NewAsymmetricCipherFromPublicKey(eciesKey)
	if err != nil {
		node.error("Failed creating asymmetrinc cipher [%s].", err.Error())

		return nil, nil, nil, err
	}

	out, err := ecies.Process(resp.Tok.Tok)
	if err != nil {
		node.error("Failed decrypting toke [%s].", err.Error())

		return nil, nil, nil, err
	}

	req.Tok.Tok = out
	req.Sig = nil

	hash := primitives.NewHash()
	raw, _ := proto.Marshal(req)
	hash.Write(raw)

	r, s, err := ecdsa.Sign(rand.Reader, signPriv, hash.Sum(nil))
	if err != nil {
		node.error("Failed signing [%s].", err.Error())

		return nil, nil, nil, err
	}
	R, _ := r.MarshalText()
	S, _ := s.MarshalText()
	req.Sig = &membersrvc.Signature{Type: membersrvc.CryptoType_ECDSA, R: R, S: S}

	resp, err = ecaP.CreateCertificatePair(context.Background(), req)
	if err != nil {
		node.error("Failed invoking CreateCertificatePair [%s].", err.Error())

		return nil, nil, nil, err
	}

	// Verify response

	// Verify cert for signing
	node.debug("Enrollment certificate for signing [% x]", primitives.Hash(resp.Certs.Sign))

	x509SignCert, err := utils.DERToX509Certificate(resp.Certs.Sign)
	if err != nil {
		node.error("Failed parsing signing enrollment certificate for signing: [%s]", err)

		return nil, nil, nil, err
	}

	_, err = utils.GetCriticalExtension(x509SignCert, ECertSubjectRole)
	if err != nil {
		node.error("Failed parsing ECertSubjectRole in enrollment certificate for signing: [%s]", err)

		return nil, nil, nil, err
	}

	err = utils.CheckCertAgainstSKAndRoot(x509SignCert, signPriv, node.ecaCertPool)
	if err != nil {
		node.error("Failed checking signing enrollment certificate for signing: [%s]", err)

		return nil, nil, nil, err
	}

	// Verify cert for encrypting
	node.debug("Enrollment certificate for encrypting [% x]", primitives.Hash(resp.Certs.Enc))

	x509EncCert, err := utils.DERToX509Certificate(resp.Certs.Enc)
	if err != nil {
		node.error("Failed parsing signing enrollment certificate for encrypting: [%s]", err)

		return nil, nil, nil, err
	}

	_, err = utils.GetCriticalExtension(x509EncCert, ECertSubjectRole)
	if err != nil {
		node.error("Failed parsing ECertSubjectRole in enrollment certificate for encrypting: [%s]", err)

		return nil, nil, nil, err
	}

	err = utils.CheckCertAgainstSKAndRoot(x509EncCert, encPriv, node.ecaCertPool)
	if err != nil {
		node.error("Failed checking signing enrollment certificate for encrypting: [%s]", err)

		return nil, nil, nil, err
	}

	return signPriv, resp.Certs.Sign, resp.Pkchain, nil
}