| // Copyright 2017 The etcd Authors |
| // |
| // 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 auth |
| |
| import ( |
| "context" |
| "crypto/rsa" |
| "io/ioutil" |
| |
| jwt "github.com/dgrijalva/jwt-go" |
| ) |
| |
| type tokenJWT struct { |
| signMethod string |
| signKey *rsa.PrivateKey |
| verifyKey *rsa.PublicKey |
| } |
| |
| func (t *tokenJWT) enable() {} |
| func (t *tokenJWT) disable() {} |
| func (t *tokenJWT) invalidateUser(string) {} |
| func (t *tokenJWT) genTokenPrefix() (string, error) { return "", nil } |
| |
| func (t *tokenJWT) info(ctx context.Context, token string, rev uint64) (*AuthInfo, bool) { |
| // rev isn't used in JWT, it is only used in simple token |
| var ( |
| username string |
| revision uint64 |
| ) |
| |
| parsed, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) { |
| return t.verifyKey, nil |
| }) |
| |
| switch err.(type) { |
| case nil: |
| if !parsed.Valid { |
| plog.Warningf("invalid jwt token: %s", token) |
| return nil, false |
| } |
| |
| claims := parsed.Claims.(jwt.MapClaims) |
| |
| username = claims["username"].(string) |
| revision = uint64(claims["revision"].(float64)) |
| default: |
| plog.Warningf("failed to parse jwt token: %s", err) |
| return nil, false |
| } |
| |
| return &AuthInfo{Username: username, Revision: revision}, true |
| } |
| |
| func (t *tokenJWT) assign(ctx context.Context, username string, revision uint64) (string, error) { |
| // Future work: let a jwt token include permission information would be useful for |
| // permission checking in proxy side. |
| tk := jwt.NewWithClaims(jwt.GetSigningMethod(t.signMethod), |
| jwt.MapClaims{ |
| "username": username, |
| "revision": revision, |
| }) |
| |
| token, err := tk.SignedString(t.signKey) |
| if err != nil { |
| plog.Debugf("failed to sign jwt token: %s", err) |
| return "", err |
| } |
| |
| plog.Debugf("jwt token: %s", token) |
| |
| return token, err |
| } |
| |
| func prepareOpts(opts map[string]string) (jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath string, err error) { |
| for k, v := range opts { |
| switch k { |
| case "sign-method": |
| jwtSignMethod = v |
| case "pub-key": |
| jwtPubKeyPath = v |
| case "priv-key": |
| jwtPrivKeyPath = v |
| default: |
| plog.Errorf("unknown token specific option: %s", k) |
| return "", "", "", ErrInvalidAuthOpts |
| } |
| } |
| if len(jwtSignMethod) == 0 { |
| return "", "", "", ErrInvalidAuthOpts |
| } |
| return jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath, nil |
| } |
| |
| func newTokenProviderJWT(opts map[string]string) (*tokenJWT, error) { |
| jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath, err := prepareOpts(opts) |
| if err != nil { |
| return nil, ErrInvalidAuthOpts |
| } |
| |
| t := &tokenJWT{} |
| |
| t.signMethod = jwtSignMethod |
| |
| verifyBytes, err := ioutil.ReadFile(jwtPubKeyPath) |
| if err != nil { |
| plog.Errorf("failed to read public key (%s) for jwt: %s", jwtPubKeyPath, err) |
| return nil, err |
| } |
| t.verifyKey, err = jwt.ParseRSAPublicKeyFromPEM(verifyBytes) |
| if err != nil { |
| plog.Errorf("failed to parse public key (%s): %s", jwtPubKeyPath, err) |
| return nil, err |
| } |
| |
| signBytes, err := ioutil.ReadFile(jwtPrivKeyPath) |
| if err != nil { |
| plog.Errorf("failed to read private key (%s) for jwt: %s", jwtPrivKeyPath, err) |
| return nil, err |
| } |
| t.signKey, err = jwt.ParseRSAPrivateKeyFromPEM(signBytes) |
| if err != nil { |
| plog.Errorf("failed to parse private key (%s): %s", jwtPrivKeyPath, err) |
| return nil, err |
| } |
| |
| return t, nil |
| } |