// CreateCertificate requests the creation of a new enrollment certificate by the ECA.
//
func (ecap *ECAP) CreateCertificate(ctx context.Context, req *pb.ECertCreateReq) (*pb.Creds, error) {
Trace.Println("grpc ECAP:CreateCertificate")
id := req.Id.Id
if pw, err := ecap.eca.readPassword(id); err != nil || pw != req.Pw.Pw {
Error.Println("identity or password do not match")
return nil, errors.New("identity or password do not match")
}
sig := req.Sig
req.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
raw := req.Pub.Key
if req.Pub.Type != pb.CryptoType_ECDSA {
Error.Println("unsupported key type")
return nil, errors.New("unsupported key type")
}
pub, err := x509.ParsePKIXPublicKey(req.Pub.Key)
if err != nil {
Error.Println(err)
return nil, err
}
hash := sha3.New384()
raw, _ = proto.Marshal(req)
hash.Write(raw)
if ecdsa.Verify(pub.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
Error.Println("signature does not verify")
return nil, errors.New("signature does not verify")
}
raw, err = ecap.eca.readCertificate(id)
if err != nil {
if raw, err = ecap.eca.newCertificate(id, pub.(*ecdsa.PublicKey), time.Now().UnixNano()); err != nil {
Error.Println(err)
return nil, err
}
}
return &pb.Creds{&pb.Cert{Cert: raw}, ecap.eca.obcKey}, 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")
}
// CreateCertificatePair requests the creation of a new enrollment certificate pair by the ECA.
//
func (ecap *ECAP) CreateCertificatePair(ctx context.Context, req *pb.ECertCreateReq) (*pb.ECertCreateResp, error) {
Trace.Println("grpc ECAP:CreateCertificate")
// validate token
var tok, prev []byte
var state int
id := req.Id.Id
err := ecap.eca.readToken(id).Scan(&tok, &state, &prev)
if err != nil || !bytes.Equal(tok, req.Tok.Tok) {
return nil, errors.New("identity or token do not match")
}
ekey, err := x509.ParsePKIXPublicKey(req.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, req.Enc.Key, id)
if err != nil {
Error.Println(err)
return nil, err
}
out, err := rsa.EncryptPKCS1v15(rand.Reader, ekey.(*rsa.PublicKey), tok)
if err != nil {
return nil, err
}
return &pb.ECertCreateResp{nil, nil, &pb.Token{out}}, nil
case state == 1:
// ensure that the same encryption key is signed that has been used for the challenge
if bytes.Compare(req.Enc.Key, prev) != 0 {
return nil, errors.New("encryption keys don't match")
}
// validate request signature
sig := req.Sig
req.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
if req.Sign.Type != pb.CryptoType_ECDSA {
return nil, errors.New("unsupported key type")
}
skey, err := x509.ParsePKIXPublicKey(req.Sign.Key)
if err != nil {
return nil, err
}
hash := sha3.New384()
raw, _ := proto.Marshal(req)
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().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.(*rsa.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
}
return &pb.ECertCreateResp{&pb.CertPair{sraw, eraw}, &pb.Token{ecap.eca.obcKey}, nil}, nil
}
return nil, errors.New("certificate creation token expired")
}