minio/cmd/jwt.go

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/*
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* Minio Cloud Storage, (C) 2016, 2017 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 (
"context"
"errors"
"fmt"
"net/http"
"time"
jwtgo "github.com/dgrijalva/jwt-go"
jwtreq "github.com/dgrijalva/jwt-go/request"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/auth"
)
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
// URL JWT token expiry is one minute (might be exposed).
defaultURLJWTExpiry = time.Minute
)
var (
errInvalidAccessKeyID = errors.New("The access key ID you provided does not exist in our records")
errChangeCredNotAllowed = errors.New("Changing access key and secret key not allowed")
errAuthentication = errors.New("Authentication failed, check your access credentials")
errNoAuthToken = errors.New("JWT token missing")
)
func authenticateJWT(accessKey, secretKey string, expiry time.Duration) (string, error) {
passedCredential, err := auth.CreateCredentials(accessKey, secretKey)
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if err != nil {
return "", err
}
serverCred := globalServerConfig.GetCredential()
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if serverCred.AccessKey != passedCredential.AccessKey {
return "", errInvalidAccessKeyID
}
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if !serverCred.Equal(passedCredential) {
return "", errAuthentication
}
jwt := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.StandardClaims{
ExpiresAt: UTCNow().Add(expiry).Unix(),
Subject: accessKey,
})
return jwt.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 authenticateURL(accessKey, secretKey string) (string, error) {
return authenticateJWT(accessKey, secretKey, defaultURLJWTExpiry)
}
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(globalServerConfig.GetCredential().SecretKey), nil
}
func isAuthTokenValid(tokenString string) bool {
if tokenString == "" {
return false
}
var claims jwtgo.StandardClaims
jwtToken, err := jwtgo.ParseWithClaims(tokenString, &claims, keyFuncCallback)
if err != nil {
logger.LogIf(context.Background(), err)
return false
}
if err = claims.Valid(); err != nil {
logger.LogIf(context.Background(), err)
return false
}
return jwtToken.Valid && claims.Subject == globalServerConfig.GetCredential().AccessKey
}
func isHTTPRequestValid(req *http.Request) bool {
return webRequestAuthenticate(req) == nil
}
// Check if the request is authenticated.
// Returns nil if the request is authenticated. errNoAuthToken if token missing.
// Returns errAuthentication for all other errors.
func webRequestAuthenticate(req *http.Request) error {
var claims jwtgo.StandardClaims
jwtToken, err := jwtreq.ParseFromRequestWithClaims(req, jwtreq.AuthorizationHeaderExtractor, &claims, keyFuncCallback)
if err != nil {
if err == jwtreq.ErrNoTokenInRequest {
return errNoAuthToken
}
return errAuthentication
}
if err = claims.Valid(); err != nil {
return errAuthentication
}
if claims.Subject != globalServerConfig.GetCredential().AccessKey {
return errInvalidAccessKeyID
}
if !jwtToken.Valid {
return errAuthentication
}
return nil
}