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Copy pathjwt.go
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116 lines (93 loc) · 3.4 KB
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/*
* Minio Cloud Storage, (C) 2016 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 cmd
import (
"errors"
"fmt"
"net/http"
"strings"
"time"
jwtgo "github.com/dgrijalva/jwt-go"
jwtreq "github.com/dgrijalva/jwt-go/request"
"golang.org/x/crypto/bcrypt"
)
const (
jwtAlgorithm = "Bearer"
// Default JWT token for web handlers is one day.
defaultJWTExpiry = 24 * time.Hour
// Inter-node JWT token expiry is 100 years approx.
defaultInterNodeJWTExpiry = 100 * 365 * 24 * time.Hour
)
var errInvalidAccessKeyLength = errors.New("Invalid access key, access key should be 5 to 20 characters in length")
var errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be 8 to 40 characters in length")
var errInvalidAccessKeyID = errors.New("The access key ID you provided does not exist in our records")
var errAuthentication = errors.New("Authentication failed, check your access credentials")
func authenticateJWT(accessKey, secretKey string, expiry time.Duration) (string, error) {
// Trim spaces.
accessKey = strings.TrimSpace(accessKey)
if !isAccessKeyValid(accessKey) {
return "", errInvalidAccessKeyLength
}
if !isSecretKeyValid(secretKey) {
return "", errInvalidSecretKeyLength
}
serverCred := serverConfig.GetCredential()
// Validate access key.
if accessKey != serverCred.AccessKey {
return "", errInvalidAccessKeyID
}
// Validate secret key.
// Using bcrypt to avoid timing attacks.
hashedSecretKey, _ := bcrypt.GenerateFromPassword([]byte(serverCred.SecretKey), bcrypt.DefaultCost)
if bcrypt.CompareHashAndPassword(hashedSecretKey, []byte(secretKey)) != nil {
return "", errAuthentication
}
utcNow := time.Now().UTC()
token := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.MapClaims{
"exp": utcNow.Add(expiry).Unix(),
"iat": utcNow.Unix(),
"sub": accessKey,
})
return token.SignedString([]byte(serverCred.SecretKey))
}
func authenticateNode(accessKey, secretKey string) (string, error) {
return authenticateJWT(accessKey, secretKey, defaultInterNodeJWTExpiry)
}
func authenticateWeb(accessKey, secretKey string) (string, error) {
return authenticateJWT(accessKey, secretKey, defaultJWTExpiry)
}
func keyFuncCallback(jwtToken *jwtgo.Token) (interface{}, error) {
if _, ok := jwtToken.Method.(*jwtgo.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", jwtToken.Header["alg"])
}
return []byte(serverConfig.GetCredential().SecretKey), nil
}
func isAuthTokenValid(tokenString string) bool {
jwtToken, err := jwtgo.Parse(tokenString, keyFuncCallback)
if err != nil {
errorIf(err, "Unable to parse JWT token string")
return false
}
return jwtToken.Valid
}
func isHTTPRequestValid(req *http.Request) bool {
jwtToken, err := jwtreq.ParseFromRequest(req, jwtreq.AuthorizationHeaderExtractor, keyFuncCallback)
if err != nil {
errorIf(err, "Unable to parse JWT token string")
return false
}
return jwtToken.Valid
}