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129 lines
3.8 KiB
129 lines
3.8 KiB
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"errors"
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"fmt"
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"net/http"
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"strings"
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"time"
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jwtgo "github.com/dgrijalva/jwt-go"
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jwtreq "github.com/dgrijalva/jwt-go/request"
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"golang.org/x/crypto/bcrypt"
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)
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const (
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jwtAlgorithm = "Bearer"
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// Default JWT token for web handlers is one day.
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defaultJWTExpiry = 24 * time.Hour
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// Inter-node JWT token expiry is 100 years approx.
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defaultInterNodeJWTExpiry = 100 * 365 * 24 * time.Hour
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)
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var errInvalidAccessKeyLength = errors.New("Invalid access key, access key should be 5 to 20 characters in length")
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var errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be 8 to 40 characters in length")
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var errInvalidAccessKeyID = errors.New("The access key ID you provided does not exist in our records")
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var errAuthentication = errors.New("Authentication failed, check your access credentials")
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var errNoAuthToken = errors.New("JWT token missing")
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func authenticateJWT(accessKey, secretKey string, expiry time.Duration) (string, error) {
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// Trim spaces.
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accessKey = strings.TrimSpace(accessKey)
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if !isAccessKeyValid(accessKey) {
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return "", errInvalidAccessKeyLength
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}
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if !isSecretKeyValid(secretKey) {
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return "", errInvalidSecretKeyLength
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}
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serverCred := serverConfig.GetCredential()
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// Validate access key.
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if accessKey != serverCred.AccessKey {
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return "", errInvalidAccessKeyID
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}
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// Validate secret key.
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// Using bcrypt to avoid timing attacks.
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hashedSecretKey, _ := bcrypt.GenerateFromPassword([]byte(serverCred.SecretKey), bcrypt.DefaultCost)
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if bcrypt.CompareHashAndPassword(hashedSecretKey, []byte(secretKey)) != nil {
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return "", errAuthentication
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}
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utcNow := time.Now().UTC()
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token := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.MapClaims{
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"exp": utcNow.Add(expiry).Unix(),
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"iat": utcNow.Unix(),
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"sub": accessKey,
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})
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return token.SignedString([]byte(serverCred.SecretKey))
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}
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func authenticateNode(accessKey, secretKey string) (string, error) {
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return authenticateJWT(accessKey, secretKey, defaultInterNodeJWTExpiry)
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}
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func authenticateWeb(accessKey, secretKey string) (string, error) {
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return authenticateJWT(accessKey, secretKey, defaultJWTExpiry)
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}
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func keyFuncCallback(jwtToken *jwtgo.Token) (interface{}, error) {
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if _, ok := jwtToken.Method.(*jwtgo.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("Unexpected signing method: %v", jwtToken.Header["alg"])
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}
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return []byte(serverConfig.GetCredential().SecretKey), nil
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}
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func isAuthTokenValid(tokenString string) bool {
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jwtToken, err := jwtgo.Parse(tokenString, keyFuncCallback)
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if err != nil {
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errorIf(err, "Unable to parse JWT token string")
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return false
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}
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return jwtToken.Valid
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}
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func isHTTPRequestValid(req *http.Request) bool {
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return webReqestAuthenticate(req) == nil
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}
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// Check if the request is authenticated.
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// Returns nil if the request is authenticated. errNoAuthToken if token missing.
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// Returns errAuthentication for all other errors.
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func webReqestAuthenticate(req *http.Request) error {
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jwtToken, err := jwtreq.ParseFromRequest(req, jwtreq.AuthorizationHeaderExtractor, keyFuncCallback)
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if err != nil {
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if err == jwtreq.ErrNoTokenInRequest {
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return errNoAuthToken
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}
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return errAuthentication
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}
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if !jwtToken.Valid {
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return errAuthentication
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}
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return nil
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}
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