frostfs-s3-gw/neofs/layer/auth.go
2020-07-08 14:16:48 +03:00

117 lines
3.1 KiB
Go

package layer
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"github.com/klauspost/compress/zstd"
"github.com/nspcc-dev/neofs-api-go/service"
"github.com/pkg/errors"
)
const (
GatewayKeySize = 2048
)
type keyPair struct {
PrivateKey *rsa.PrivateKey
PublicKey *rsa.PublicKey
}
type AuthCenter struct {
gatewayKeys keyPair
}
func NewAuthCenter() (*AuthCenter, error) {
var (
err error
privateKey *rsa.PrivateKey
)
privateKey, err = pullGatewayPrivateKey()
if err != nil {
return nil, errors.Wrap(err, "failed to pull gateway private key from trusted enclave")
}
if privateKey == nil {
if privateKey, err = rsa.GenerateKey(rand.Reader, GatewayKeySize); err != nil {
return nil, errors.Wrap(err, "failed to generate gateway private key")
}
if err = pushGatewayPrivateKey(privateKey); err != nil {
return nil, errors.Wrap(err, "failed to push gateway private key to trusted enclave")
}
}
ac := &AuthCenter{gatewayKeys: keyPair{
PrivateKey: privateKey,
PublicKey: &privateKey.PublicKey,
}}
return ac, nil
}
func (ac *AuthCenter) PackBearerToken(bearerToken *service.BearerTokenMsg) ([]byte, error) {
data, err := bearerToken.Marshal()
if err != nil {
return nil, errors.Wrap(err, "failed to marshal bearer token")
}
encryptedKeyID, err := ac.encrypt(compress(data))
if err != nil {
return nil, errors.Wrap(err, "")
}
return append(sha256Hash(data), encryptedKeyID...), nil
}
func (ac *AuthCenter) UnpackBearerToken(packedBearerToken []byte) (*service.BearerTokenMsg, error) {
compressedKeyID := packedBearerToken[32:]
encryptedKeyID, err := decompress(compressedKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to decompress key ID")
}
keyID, err := ac.decrypt(encryptedKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to decrypt key ID")
}
bearerToken := new(service.BearerTokenMsg)
if err := bearerToken.Unmarshal(keyID); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal embedded bearer token")
}
return bearerToken, nil
}
func pullGatewayPrivateKey() (*rsa.PrivateKey, error) {
// TODO: Pull the private key from a persistent and trusted enclave.
return nil, nil
}
func pushGatewayPrivateKey(key *rsa.PrivateKey) error {
// TODO: Push the private key to a persistent and trusted enclave.
return nil
}
func (ac *AuthCenter) encrypt(data []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha256.New(), rand.Reader, ac.gatewayKeys.PublicKey, data, []byte{})
}
func (ac *AuthCenter) decrypt(data []byte) ([]byte, error) {
return rsa.DecryptOAEP(sha256.New(), rand.Reader, ac.gatewayKeys.PrivateKey, data, []byte{})
}
func compress(data []byte) []byte {
var compressedData []byte
zstdEncoder, _ := zstd.NewWriter(nil)
zstdEncoder.EncodeAll(data, compressedData)
return compressedData
}
func decompress(data []byte) ([]byte, error) {
var decompressedData []byte
zstdDecoder, _ := zstd.NewReader(nil)
if _, err := zstdDecoder.DecodeAll(data, decompressedData); err != nil {
return nil, err
}
return decompressedData, nil
}
func sha256Hash(data []byte) []byte {
hash := sha256.New()
hash.Write(data)
return hash.Sum(nil)
}