130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
package auth
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/pem"
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"io/ioutil"
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"os"
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"github.com/pkg/errors"
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)
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const (
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gatewayEncryptionKeySize = 4096
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)
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const (
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_ encryptionKeyName = iota
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// Indicates that the key is used to encrypt
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// a bearer token to pass auth procedure.
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gateUserAuthKey
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)
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const (
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_ signatureKeyName = iota
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// Indicates that the key is a NeoFS ECDSA key.
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gateNeoFSECDSAKey
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// Indicates that the key is a NeoFS Ed25519 key.
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gateNeoFSEd25519Key
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)
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type (
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signatureKeyName byte
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encryptionKeyName byte
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)
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type (
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signatureKeyPair struct {
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PrivateKey *ecdsa.PrivateKey
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PublicKey *ecdsa.PublicKey
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}
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encryptionKeyPair struct {
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PrivateKey *rsa.PrivateKey
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PublicKey *rsa.PublicKey
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}
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)
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type secureEnclave struct {
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signatureKeys map[signatureKeyName]signatureKeyPair
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encryptionKeys map[encryptionKeyName]encryptionKeyPair
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}
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func newSecureEnclave(pathToRSAKey, pathToECDSAKey string) (*secureEnclave, error) {
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var (
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rsaKey *rsa.PrivateKey
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ecdsaKey *ecdsa.PrivateKey
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)
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if key1bs, err := ioutil.ReadFile(pathToRSAKey); err != nil {
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// No file found.
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if os.IsNotExist(err) {
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if rsaKey, err = rsa.GenerateKey(rand.Reader, gatewayEncryptionKeySize); err != nil {
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return nil, errors.Wrap(err, "failed to generate RSA key")
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}
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key1bs := x509.MarshalPKCS1PrivateKey(rsaKey)
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data := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: key1bs})
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if err := ioutil.WriteFile(pathToRSAKey, data, 0o600); err != nil {
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return nil, errors.Wrapf(err, "failed to write file %s", pathToRSAKey)
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}
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} else {
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return nil, errors.Wrapf(err, "failed to open file %s", pathToRSAKey)
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}
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} else {
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pemBlock, _ := pem.Decode(key1bs)
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if pemBlock == nil {
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return nil, errors.Errorf("failed to decode PEM data from file %s", pathToRSAKey)
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}
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rsaKey, err = x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to parse private key bytes from pem data from file %s", pathToRSAKey)
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}
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}
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if key2bs, err := ioutil.ReadFile(pathToECDSAKey); err != nil {
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// No file found.
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if os.IsNotExist(err) {
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if ecdsaKey, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader); err != nil {
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return nil, errors.Wrap(err, "failed to generate ECDSA key")
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}
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key2bs, err := x509.MarshalECPrivateKey(ecdsaKey)
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if err != nil {
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return nil, errors.New("failed to marshal ECDSA private key")
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}
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data := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: key2bs})
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if err := ioutil.WriteFile(pathToECDSAKey, data, 0o600); err != nil {
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return nil, errors.Wrapf(err, "failed to write file %s", pathToECDSAKey)
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}
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} else {
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return nil, errors.Wrapf(err, "failed to open file %s", pathToECDSAKey)
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}
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} else {
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pemBlock, _ := pem.Decode(key2bs)
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if pemBlock == nil {
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return nil, errors.Errorf("failed to decode PEM data from file %s", pathToECDSAKey)
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}
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ecdsaKey, err = x509.ParseECPrivateKey(pemBlock.Bytes)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to parse private key bytes from pem data from file %s", pathToECDSAKey)
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}
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}
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return &secureEnclave{
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encryptionKeys: map[encryptionKeyName]encryptionKeyPair{
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gateUserAuthKey: {rsaKey, &rsaKey.PublicKey},
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},
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signatureKeys: map[signatureKeyName]signatureKeyPair{
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gateNeoFSECDSAKey: {ecdsaKey, &ecdsaKey.PublicKey},
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},
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}, nil
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}
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func (se *secureEnclave) Encrypt(keyName encryptionKeyName, data []byte) ([]byte, error) {
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return rsa.EncryptOAEP(sha256.New(), rand.Reader, se.encryptionKeys[keyName].PublicKey, data, []byte{})
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}
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func (se *secureEnclave) Decrypt(keyName encryptionKeyName, data []byte) ([]byte, error) {
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return rsa.DecryptOAEP(sha256.New(), rand.Reader, se.encryptionKeys[keyName].PrivateKey, data, []byte{})
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}
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