frostfs-s3-gw/auth/center.go

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package auth
import (
"crypto/sha256"
"github.com/klauspost/compress/zstd"
"github.com/nspcc-dev/neofs-api-go/service"
"github.com/pkg/errors"
)
// Center is a central app's authentication/authorization management unit.
type Center struct {
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enclave *secureEnclave
zstdEncoder *zstd.Encoder
zstdDecoder *zstd.Decoder
}
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// NewCenter creates an instance of AuthCenter.
func NewCenter(pathToRSAKey, pathToECDSAKey string) (*Center, error) {
zstdEncoder, _ := zstd.NewWriter(nil)
zstdDecoder, _ := zstd.NewReader(nil)
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enclave, err := newSecureEnclave(pathToRSAKey, pathToECDSAKey)
if err != nil {
return nil, errors.Wrap(err, "failed to create secure enclave")
}
center := &Center{
enclave: enclave,
zstdEncoder: zstdEncoder,
zstdDecoder: zstdDecoder,
}
return center, nil
}
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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")
}
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encryptedKeyID, err := center.enclave.Encrypt(gateUserAuthKey, center.compress(data))
if err != nil {
return nil, errors.Wrap(err, "")
}
return append(sha256Hash(data), encryptedKeyID...), nil
}
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func (center *Center) UnpackBearerToken(packedBearerToken []byte) (*service.BearerTokenMsg, error) {
compressedKeyID := packedBearerToken[32:]
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encryptedKeyID, err := center.decompress(compressedKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to decompress key ID")
}
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keyID, err := center.enclave.Decrypt(gateUserAuthKey, 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
}
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func (center *Center) compress(data []byte) []byte {
center.zstdEncoder.Reset(nil)
var compressedData []byte
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center.zstdEncoder.EncodeAll(data, compressedData)
return compressedData
}
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func (center *Center) decompress(data []byte) ([]byte, error) {
center.zstdDecoder.Reset(nil)
var decompressedData []byte
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if _, err := center.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)
}