// CreateCertificate requests the creation of a new enrollment certificate by the TLSCA.
//
func (tlscap *TLSCAP) CreateCertificate(ctx context.Context, in *pb.TLSCertCreateReq) (*pb.TLSCertCreateResp, error) {
Trace.Println("grpc TLSCAP:CreateCertificate")
id := in.Id.Id
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
raw := in.Pub.Key
if in.Pub.Type != pb.CryptoType_ECDSA {
return nil, errors.New("unsupported key type")
}
pub, err := x509.ParsePKIXPublicKey(in.Pub.Key)
if err != nil {
return nil, err
}
hash := utils.NewHash()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(pub.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
if raw, err = tlscap.tlsca.createCertificate(id, pub.(*ecdsa.PublicKey), x509.KeyUsageDigitalSignature, in.Ts.Seconds, nil); err != nil {
Error.Println(err)
return nil, err
}
return &pb.TLSCertCreateResp{&pb.Cert{raw}, &pb.Cert{tlscap.tlsca.raw}}, nil
}
// ReadCertificateSet reads a transaction certificate set from the TCA. Not yet implemented.
//
func (tcap *TCAP) ReadCertificateSet(ctx context.Context, in *pb.TCertReadSetReq) (*pb.CertSet, error) {
Trace.Println("grpc TCAP:ReadCertificateSet")
req := in.Req.Id
id := in.Id.Id
if req != id && tcap.tca.eca.readRole(req)&int(pb.Role_AUDITOR) == 0 {
return nil, errors.New("access denied")
}
raw, err := tcap.tca.eca.readCertificate(req, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := utils.NewHash()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(cert.PublicKey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
rows, err := tcap.tca.readCertificates(id, in.Ts.Seconds)
if err != nil {
return nil, err
}
defer rows.Close()
var certs [][]byte
var kdfKey []byte
for rows.Next() {
var raw []byte
if err = rows.Scan(&raw, &kdfKey); err != nil {
return nil, err
}
certs = append(certs, raw)
}
if err = rows.Err(); err != nil {
return nil, err
}
return &pb.CertSet{in.Ts, in.Id, kdfKey, certs}, nil
}
// ReadUserSet returns a list of users matching the parameters set in the read request.
//
func (ecaa *ECAA) ReadUserSet(ctx context.Context, in *pb.ReadUserSetReq) (*pb.UserSet, error) {
Trace.Println("grpc ECAA:ReadUserSet")
req := in.Req.Id
if ecaa.eca.readRole(req)&int(pb.Role_AUDITOR) == 0 {
return nil, errors.New("access denied")
}
raw, err := ecaa.eca.readCertificate(req, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := utils.NewHash()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(cert.PublicKey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
rows, err := ecaa.eca.readUsers(int(in.Role))
if err != nil {
return nil, err
}
defer rows.Close()
var users []*pb.User
if err == nil {
for rows.Next() {
var id string
var role int
err = rows.Scan(&id, &role)
users = append(users, &pb.User{&pb.Identity{id}, pb.Role(role)})
}
err = rows.Err()
}
return &pb.UserSet{users}, err
}
func (ca *CA) createCertificate(id string, pub interface{}, usage x509.KeyUsage, timestamp int64, kdfKey []byte, opt ...pkix.Extension) ([]byte, error) {
Trace.Println("Creating certificate for " + id + ".")
raw, err := ca.newCertificate(id, pub, usage, opt)
if err != nil {
Error.Println(err)
return nil, err
}
hash := utils.NewHash()
hash.Write(raw)
if _, err = ca.db.Exec("INSERT INTO Certificates (id, timestamp, usage, cert, hash, kdfkey) VALUES (?, ?, ?, ?, ?, ?)", id, timestamp, usage, raw, hash.Sum(nil), kdfKey); err != nil {
Error.Println(err)
}
return raw, err
}
// ReadCertificate reads a transaction certificate from the TCA.
//
func (tcap *TCAP) ReadCertificate(ctx context.Context, in *pb.TCertReadReq) (*pb.Cert, error) {
Trace.Println("grpc TCAP:ReadCertificate")
req := in.Req.Id
id := in.Id.Id
if req != id && tcap.tca.eca.readRole(req)&(int(pb.Role_VALIDATOR)|int(pb.Role_AUDITOR)) == 0 {
return nil, errors.New("access denied")
}
raw, err := tcap.tca.eca.readCertificate(req, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := utils.NewHash()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(cert.PublicKey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
if in.Ts.Seconds != 0 {
raw, err = tcap.tca.readCertificate1(id, in.Ts.Seconds)
} else {
raw, err = tcap.tca.readCertificateByHash(in.Hash.Hash)
}
if err != nil {
return nil, err
}
return &pb.Cert{raw}, nil
}
// 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")
}
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
}
// ReadCertificateSets returns all certificates matching the filter criteria of the request.
//
func (tcaa *TCAA) ReadCertificateSets(ctx context.Context, in *pb.TCertReadSetsReq) (*pb.CertSets, error) {
Trace.Println("grpc TCAA:ReadCertificateSets")
req := in.Req.Id
if tcaa.tca.eca.readRole(req)&int(pb.Role_AUDITOR) == 0 {
return nil, errors.New("access denied")
}
raw, err := tcaa.tca.eca.readCertificate(req, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := utils.NewHash()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(cert.PublicKey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
users, err := tcaa.tca.eca.readUsers(int(in.Role))
if err != nil {
return nil, err
}
defer users.Close()
begin := int64(0)
end := int64(math.MaxInt64)
if in.Begin != nil {
begin = in.Begin.Seconds
}
if in.End != nil {
end = in.End.Seconds
}
var sets []*pb.CertSet
for users.Next() {
var id string
var role int
if err = users.Scan(&id, &role); err != nil {
return nil, err
}
rows, err := tcaa.tca.eca.readCertificateSets(id, begin, end)
if err != nil {
return nil, err
}
defer rows.Close()
var certs [][]byte
var kdfKey []byte
var timestamp int64
timestamp = 0
for rows.Next() {
var cert []byte
var ts int64
if err = rows.Scan(&cert, &kdfKey, &ts); err != nil {
return nil, err
}
if ts != timestamp {
sets = append(sets, &pb.CertSet{&protobuf.Timestamp{Seconds: timestamp, Nanos: 0}, &pb.Identity{id}, kdfKey, certs})
timestamp = ts
certs = nil
}
certs = append(certs, cert)
}
if err = rows.Err(); err != nil {
return nil, err
}
sets = append(sets, &pb.CertSet{&protobuf.Timestamp{Seconds: timestamp, Nanos: 0}, &pb.Identity{id}, kdfKey, certs})
}
if err = users.Err(); err != nil {
return nil, err
}
return &pb.CertSets{sets}, nil
}
// CreateCertificateSet requests the creation of a new transaction certificate set by the TCA.
//
func (tcap *TCAP) CreateCertificateSet(ctx context.Context, in *pb.TCertCreateSetReq) (*pb.TCertCreateSetResp, error) {
Trace.Println("grpc TCAP:CreateCertificateSet")
id := in.Id.Id
raw, err := tcap.tca.eca.readCertificate(id, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
pub := cert.PublicKey.(*ecdsa.PublicKey)
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := utils.NewHash()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(pub, hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
nonce := make([]byte, 16) // 8 bytes rand, 8 bytes timestamp
rand.Reader.Read(nonce[:8])
binary.LittleEndian.PutUint64(nonce[8:], uint64(in.Ts.Seconds))
mac := hmac.New(conf.GetDefaultHash(), tcap.tca.hmacKey)
raw, _ = x509.MarshalPKIXPublicKey(pub)
mac.Write(raw)
kdfKey := mac.Sum(nil)
num := int(in.Num)
if num == 0 {
num = 1
}
var set [][]byte
for i := 0; i < num; i++ {
tidx := []byte(strconv.Itoa(i))
tidx = append(tidx[:], nonce[:]...)
mac = hmac.New(conf.GetDefaultHash(), kdfKey)
mac.Write([]byte{1})
extKey := mac.Sum(nil)[:32]
mac = hmac.New(conf.GetDefaultHash(), kdfKey)
mac.Write([]byte{2})
mac = hmac.New(conf.GetDefaultHash(), mac.Sum(nil))
mac.Write(tidx)
one := new(big.Int).SetInt64(1)
k := new(big.Int).SetBytes(mac.Sum(nil))
k.Mod(k, new(big.Int).Sub(pub.Curve.Params().N, one))
k.Add(k, one)
tmpX, tmpY := pub.ScalarBaseMult(k.Bytes())
txX, txY := pub.Curve.Add(pub.X, pub.Y, tmpX, tmpY)
txPub := ecdsa.PublicKey{Curve: pub.Curve, X: txX, Y: txY}
ext, err := CBCEncrypt(extKey, tidx)
if err != nil {
return nil, err
}
if raw, err = tcap.tca.createCertificate(id, &txPub, x509.KeyUsageDigitalSignature, in.Ts.Seconds, kdfKey, pkix.Extension{Id: TCertEncTCertIndex, Critical: true, Value: ext}); err != nil {
Error.Println(err)
return nil, err
}
set = append(set, raw)
}
return &pb.TCertCreateSetResp{&pb.CertSet{in.Ts, in.Id, kdfKey, set}}, nil
}