mirror of https://github.com/minio/minio.git
138 lines
3.0 KiB
Go
138 lines
3.0 KiB
Go
/*
|
|
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package openid
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rsa"
|
|
"encoding/base64"
|
|
"encoding/binary"
|
|
"errors"
|
|
"fmt"
|
|
"math/big"
|
|
"strings"
|
|
)
|
|
|
|
// JWKS - https://tools.ietf.org/html/rfc7517
|
|
type JWKS struct {
|
|
Keys []*JWKS `json:"keys,omitempty"`
|
|
|
|
Kty string `json:"kty"`
|
|
Use string `json:"use,omitempty"`
|
|
Kid string `json:"kid,omitempty"`
|
|
Alg string `json:"alg,omitempty"`
|
|
|
|
Crv string `json:"crv,omitempty"`
|
|
X string `json:"x,omitempty"`
|
|
Y string `json:"y,omitempty"`
|
|
D string `json:"d,omitempty"`
|
|
N string `json:"n,omitempty"`
|
|
E string `json:"e,omitempty"`
|
|
K string `json:"k,omitempty"`
|
|
}
|
|
|
|
func safeDecode(str string) ([]byte, error) {
|
|
lenMod4 := len(str) % 4
|
|
if lenMod4 > 0 {
|
|
str = str + strings.Repeat("=", 4-lenMod4)
|
|
}
|
|
|
|
return base64.URLEncoding.DecodeString(str)
|
|
}
|
|
|
|
var (
|
|
errMalformedJWKRSAKey = errors.New("malformed JWK RSA key")
|
|
errMalformedJWKECKey = errors.New("malformed JWK EC key")
|
|
)
|
|
|
|
// DecodePublicKey - decodes JSON Web Key (JWK) as public key
|
|
func (key *JWKS) DecodePublicKey() (crypto.PublicKey, error) {
|
|
switch key.Kty {
|
|
case "RSA":
|
|
if key.N == "" || key.E == "" {
|
|
return nil, errMalformedJWKRSAKey
|
|
}
|
|
|
|
// decode exponent
|
|
data, err := safeDecode(key.E)
|
|
if err != nil {
|
|
return nil, errMalformedJWKRSAKey
|
|
}
|
|
|
|
if len(data) < 4 {
|
|
ndata := make([]byte, 4)
|
|
copy(ndata[4-len(data):], data)
|
|
data = ndata
|
|
}
|
|
|
|
pubKey := &rsa.PublicKey{
|
|
N: &big.Int{},
|
|
E: int(binary.BigEndian.Uint32(data[:])),
|
|
}
|
|
|
|
data, err = safeDecode(key.N)
|
|
if err != nil {
|
|
return nil, errMalformedJWKRSAKey
|
|
}
|
|
pubKey.N.SetBytes(data)
|
|
|
|
return pubKey, nil
|
|
case "EC":
|
|
if key.Crv == "" || key.X == "" || key.Y == "" {
|
|
return nil, errMalformedJWKECKey
|
|
}
|
|
|
|
var curve elliptic.Curve
|
|
switch key.Crv {
|
|
case "P-224":
|
|
curve = elliptic.P224()
|
|
case "P-256":
|
|
curve = elliptic.P256()
|
|
case "P-384":
|
|
curve = elliptic.P384()
|
|
case "P-521":
|
|
curve = elliptic.P521()
|
|
default:
|
|
return nil, fmt.Errorf("Unknown curve type: %s", key.Crv)
|
|
}
|
|
|
|
pubKey := &ecdsa.PublicKey{
|
|
Curve: curve,
|
|
X: &big.Int{},
|
|
Y: &big.Int{},
|
|
}
|
|
|
|
data, err := safeDecode(key.X)
|
|
if err != nil {
|
|
return nil, errMalformedJWKECKey
|
|
}
|
|
pubKey.X.SetBytes(data)
|
|
|
|
data, err = safeDecode(key.Y)
|
|
if err != nil {
|
|
return nil, errMalformedJWKECKey
|
|
}
|
|
pubKey.Y.SetBytes(data)
|
|
|
|
return pubKey, nil
|
|
default:
|
|
return nil, fmt.Errorf("Unknown JWK key type %s", key.Kty)
|
|
}
|
|
}
|