Exemple #1
0
// CreateCertificatePair requests the creation of a new enrollment certificate pair by the ECA.
//
func (ecap *ECAP) CreateCertificatePair(ctx context.Context, in *pb.ECertCreateReq) (*pb.ECertCreateResp, error) {
	Trace.Println("grpc ECAP:CreateCertificate")

	// validate token
	var tok, prev []byte
	var role, state int

	id := in.Id.Id
	err := ecap.eca.readUser(id).Scan(&role, &tok, &state, &prev)
	if err != nil || !bytes.Equal(tok, in.Tok.Tok) {
		return nil, errors.New("identity or token do not match")
	}

	ekey, err := x509.ParsePKIXPublicKey(in.Enc.Key)
	if err != nil {
		return nil, err
	}

	switch {
	case state == 0:
		// initial request, create encryption challenge
		tok = []byte(randomString(12))

		_, err = ecap.eca.db.Exec("UPDATE Users SET token=?, state=?, key=? WHERE id=?", tok, 1, in.Enc.Key, id)
		if err != nil {
			Error.Println(err)
			return nil, err
		}

		//		out, err := rsa.EncryptPKCS1v15(rand.Reader, ekey.(*rsa.PublicKey), tok)
		spi := ecies.NewSPI()
		eciesKey, err := spi.NewPublicKey(nil, ekey.(*ecdsa.PublicKey))
		if err != nil {
			return nil, err
		}

		ecies, err := spi.NewAsymmetricCipherFromPublicKey(eciesKey)
		if err != nil {
			return nil, err
		}

		out, err := ecies.Process(tok)
		return &pb.ECertCreateResp{nil, nil, nil, &pb.Token{out}}, err

	case state == 1:
		// ensure that the same encryption key is signed that has been used for the challenge
		if subtle.ConstantTimeCompare(in.Enc.Key, prev) != 1 {
			return nil, errors.New("encryption keys don't match")
		}

		// validate request signature
		sig := in.Sig
		in.Sig = nil

		r, s := big.NewInt(0), big.NewInt(0)
		r.UnmarshalText(sig.R)
		s.UnmarshalText(sig.S)

		if in.Sign.Type != pb.CryptoType_ECDSA {
			return nil, errors.New("unsupported key type")
		}
		skey, err := x509.ParsePKIXPublicKey(in.Sign.Key)
		if err != nil {
			return nil, err
		}

		hash := utils.NewHash()
		raw, _ := proto.Marshal(in)
		hash.Write(raw)
		if ecdsa.Verify(skey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
			return nil, errors.New("signature does not verify")
		}

		// create new certificate pair
		ts := time.Now().Add(-1 * time.Minute).UnixNano()

		sraw, err := ecap.eca.createCertificate(id, skey.(*ecdsa.PublicKey), x509.KeyUsageDigitalSignature, ts, nil, pkix.Extension{Id: ECertSubjectRole, Critical: true, Value: []byte(strconv.Itoa(ecap.eca.readRole(id)))})
		if err != nil {
			Error.Println(err)
			return nil, err
		}

		eraw, err := ecap.eca.createCertificate(id, ekey.(*ecdsa.PublicKey), x509.KeyUsageDataEncipherment, ts, nil, pkix.Extension{Id: ECertSubjectRole, Critical: true, Value: []byte(strconv.Itoa(ecap.eca.readRole(id)))})
		if err != nil {
			ecap.eca.db.Exec("DELETE FROM Certificates Where id=?", id)
			Error.Println(err)
			return nil, err
		}

		_, err = ecap.eca.db.Exec("UPDATE Users SET state=? WHERE id=?", 2, id)
		if err != nil {
			ecap.eca.db.Exec("DELETE FROM Certificates Where id=?", id)
			Error.Println(err)
			return nil, err
		}

		var obcECKey []byte
		if role == int(pb.Role_VALIDATOR) {
			//if role&(int(pb.Role_VALIDATOR)|int(pb.Role_AUDITOR)) != 0 {
			obcECKey = ecap.eca.obcPriv
		} else {
			obcECKey = ecap.eca.obcPub
		}

		return &pb.ECertCreateResp{&pb.CertPair{sraw, eraw}, &pb.Token{ecap.eca.obcKey}, obcECKey, nil}, nil
	}

	return nil, errors.New("certificate creation token expired")
}
Exemple #2
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 := utils.NewECDSAKey()
	if err != nil {
		node.log.Error("Failed generating ECDSA key [%s].", err.Error())

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

		return nil, nil, nil, err
	}

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

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

		return nil, nil, nil, err
	}

	req := &obcca.ECertCreateReq{&protobuf.Timestamp{Seconds: time.Now().Unix(), Nanos: 0},
		&obcca.Identity{id},
		&obcca.Token{Tok: []byte(pw)},
		&obcca.PublicKey{obcca.CryptoType_ECDSA, signPub},
		&obcca.PublicKey{obcca.CryptoType_ECDSA, encPub},
		nil}

	resp, err := ecaP.CreateCertificatePair(context.Background(), req)
	if err != nil {
		node.log.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.log.Error("Failed parsing decrypting key [%s].", err.Error())

		return nil, nil, nil, err
	}

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

		return nil, nil, nil, err
	}

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

		return nil, nil, nil, err
	}

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

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

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

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

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

		return nil, nil, nil, err
	}

	// Verify response

	// Verify cert for signing
	node.log.Debug("Enrollment certificate for signing [%s]", utils.EncodeBase64(utils.Hash(resp.Certs.Sign)))

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

		return nil, nil, nil, err
	}

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

		return nil, nil, nil, err
	}

	// Verify cert for encrypting
	node.log.Debug("Enrollment certificate for encrypting [%s]", utils.EncodeBase64(utils.Hash(resp.Certs.Enc)))

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

		return nil, nil, nil, err
	}

	_, err = utils.GetCriticalExtension(x509EncCert, ECertSubjectRole)
	if err != nil {
		node.log.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.log.Error("Failed checking signing enrollment certificate for encrypting: [%s]", err)

		return nil, nil, nil, err
	}

	// END

	return signPriv, resp.Certs.Sign, resp.Chain.Tok, nil
}