frostfs-s3-gw/auth/center.go

156 lines
4.2 KiB
Go

package auth
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"io/ioutil"
"github.com/klauspost/compress/zstd"
"github.com/nspcc-dev/neofs-api-go/refs"
"github.com/nspcc-dev/neofs-api-go/service"
crypto "github.com/nspcc-dev/neofs-crypto"
"github.com/pkg/errors"
)
// Center is a central app's authentication/authorization management unit.
type Center struct {
zstdEncoder *zstd.Encoder
zstdDecoder *zstd.Decoder
neofsKeys struct {
PrivateKey *ecdsa.PrivateKey
PublicKey *ecdsa.PublicKey
}
ownerID refs.OwnerID
wifString string
userAuthKeys struct {
PrivateKey *rsa.PrivateKey
PublicKey *rsa.PublicKey
}
}
// NewCenter creates an instance of AuthCenter.
func NewCenter() *Center {
zstdEncoder, _ := zstd.NewWriter(nil)
zstdDecoder, _ := zstd.NewReader(nil)
return &Center{
zstdEncoder: zstdEncoder,
zstdDecoder: zstdDecoder,
}
}
func (center *Center) SetNeoFSKeys(key *ecdsa.PrivateKey) error {
publicKey := &key.PublicKey
oid, err := refs.NewOwnerID(publicKey)
if err != nil {
return errors.Wrap(err, "failed to get OwnerID")
}
center.neofsKeys.PrivateKey = key
wif, err := crypto.WIFEncode(key)
if err != nil {
return errors.Wrap(err, "failed to get WIF string from given key")
}
center.neofsKeys.PublicKey = publicKey
center.ownerID = oid
center.wifString = wif
return nil
}
func (center *Center) GetNeoFSKeyPrivateKey() *ecdsa.PrivateKey {
return center.neofsKeys.PrivateKey
}
func (center *Center) GetNeoFSKeyPublicKey() *ecdsa.PublicKey {
return center.neofsKeys.PublicKey
}
func (center *Center) GetOwnerID() refs.OwnerID {
return center.ownerID
}
func (center *Center) GetWIFString() string {
return center.wifString
}
func (center *Center) SetUserAuthKeys(key *rsa.PrivateKey) {
center.userAuthKeys.PrivateKey = key
center.userAuthKeys.PublicKey = &key.PublicKey
}
func (center *Center) 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 := encrypt(center.userAuthKeys.PublicKey, center.compress(data))
if err != nil {
return nil, errors.Wrap(err, "")
}
return append(sha256Hash(data), encryptedKeyID...), nil
}
func (center *Center) UnpackBearerToken(packedBearerToken []byte) (*service.BearerTokenMsg, error) {
compressedKeyID := packedBearerToken[32:]
encryptedKeyID, err := center.decompress(compressedKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to decompress key ID")
}
keyID, err := decrypt(center.userAuthKeys.PrivateKey, 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 (center *Center) compress(data []byte) []byte {
center.zstdEncoder.Reset(nil)
var compressedData []byte
center.zstdEncoder.EncodeAll(data, compressedData)
return compressedData
}
func (center *Center) decompress(data []byte) ([]byte, error) {
center.zstdDecoder.Reset(nil)
var decompressedData []byte
if _, err := center.zstdDecoder.DecodeAll(data, decompressedData); err != nil {
return nil, err
}
return decompressedData, nil
}
func encrypt(key *rsa.PublicKey, data []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha256.New(), rand.Reader, key, data, []byte{})
}
func decrypt(key *rsa.PrivateKey, data []byte) ([]byte, error) {
return rsa.DecryptOAEP(sha256.New(), rand.Reader, key, data, []byte{})
}
func sha256Hash(data []byte) []byte {
hash := sha256.New()
hash.Write(data)
return hash.Sum(nil)
}
func ReadRSAPrivateKeyFromPEMFile(filePath string) (*rsa.PrivateKey, error) {
kbs, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, errors.Wrapf(err, "failed to read file %s", filePath)
}
pemBlock, _ := pem.Decode(kbs)
if pemBlock == nil {
return nil, errors.Errorf("failed to decode PEM data from file %s", filePath)
}
rsaKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse private key bytes from pem data from file %s", filePath)
}
return rsaKey, nil
}