khenaidoo | 2672188 | 2021-08-11 17:42:52 -0400 | [diff] [blame] | 1 | // Copyright 2017 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package auth |
| 16 | |
| 17 | import ( |
| 18 | "context" |
| 19 | "crypto/rsa" |
| 20 | "io/ioutil" |
| 21 | |
| 22 | jwt "github.com/dgrijalva/jwt-go" |
| 23 | ) |
| 24 | |
| 25 | type tokenJWT struct { |
| 26 | signMethod string |
| 27 | signKey *rsa.PrivateKey |
| 28 | verifyKey *rsa.PublicKey |
| 29 | } |
| 30 | |
| 31 | func (t *tokenJWT) enable() {} |
| 32 | func (t *tokenJWT) disable() {} |
| 33 | func (t *tokenJWT) invalidateUser(string) {} |
| 34 | func (t *tokenJWT) genTokenPrefix() (string, error) { return "", nil } |
| 35 | |
| 36 | func (t *tokenJWT) info(ctx context.Context, token string, rev uint64) (*AuthInfo, bool) { |
| 37 | // rev isn't used in JWT, it is only used in simple token |
| 38 | var ( |
| 39 | username string |
| 40 | revision uint64 |
| 41 | ) |
| 42 | |
| 43 | parsed, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) { |
| 44 | return t.verifyKey, nil |
| 45 | }) |
| 46 | |
| 47 | switch err.(type) { |
| 48 | case nil: |
| 49 | if !parsed.Valid { |
| 50 | plog.Warningf("invalid jwt token: %s", token) |
| 51 | return nil, false |
| 52 | } |
| 53 | |
| 54 | claims := parsed.Claims.(jwt.MapClaims) |
| 55 | |
| 56 | username = claims["username"].(string) |
| 57 | revision = uint64(claims["revision"].(float64)) |
| 58 | default: |
| 59 | plog.Warningf("failed to parse jwt token: %s", err) |
| 60 | return nil, false |
| 61 | } |
| 62 | |
| 63 | return &AuthInfo{Username: username, Revision: revision}, true |
| 64 | } |
| 65 | |
| 66 | func (t *tokenJWT) assign(ctx context.Context, username string, revision uint64) (string, error) { |
| 67 | // Future work: let a jwt token include permission information would be useful for |
| 68 | // permission checking in proxy side. |
| 69 | tk := jwt.NewWithClaims(jwt.GetSigningMethod(t.signMethod), |
| 70 | jwt.MapClaims{ |
| 71 | "username": username, |
| 72 | "revision": revision, |
| 73 | }) |
| 74 | |
| 75 | token, err := tk.SignedString(t.signKey) |
| 76 | if err != nil { |
| 77 | plog.Debugf("failed to sign jwt token: %s", err) |
| 78 | return "", err |
| 79 | } |
| 80 | |
| 81 | plog.Debugf("jwt token: %s", token) |
| 82 | |
| 83 | return token, err |
| 84 | } |
| 85 | |
| 86 | func prepareOpts(opts map[string]string) (jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath string, err error) { |
| 87 | for k, v := range opts { |
| 88 | switch k { |
| 89 | case "sign-method": |
| 90 | jwtSignMethod = v |
| 91 | case "pub-key": |
| 92 | jwtPubKeyPath = v |
| 93 | case "priv-key": |
| 94 | jwtPrivKeyPath = v |
| 95 | default: |
| 96 | plog.Errorf("unknown token specific option: %s", k) |
| 97 | return "", "", "", ErrInvalidAuthOpts |
| 98 | } |
| 99 | } |
| 100 | if len(jwtSignMethod) == 0 { |
| 101 | return "", "", "", ErrInvalidAuthOpts |
| 102 | } |
| 103 | return jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath, nil |
| 104 | } |
| 105 | |
| 106 | func newTokenProviderJWT(opts map[string]string) (*tokenJWT, error) { |
| 107 | jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath, err := prepareOpts(opts) |
| 108 | if err != nil { |
| 109 | return nil, ErrInvalidAuthOpts |
| 110 | } |
| 111 | |
| 112 | t := &tokenJWT{} |
| 113 | |
| 114 | t.signMethod = jwtSignMethod |
| 115 | |
| 116 | verifyBytes, err := ioutil.ReadFile(jwtPubKeyPath) |
| 117 | if err != nil { |
| 118 | plog.Errorf("failed to read public key (%s) for jwt: %s", jwtPubKeyPath, err) |
| 119 | return nil, err |
| 120 | } |
| 121 | t.verifyKey, err = jwt.ParseRSAPublicKeyFromPEM(verifyBytes) |
| 122 | if err != nil { |
| 123 | plog.Errorf("failed to parse public key (%s): %s", jwtPubKeyPath, err) |
| 124 | return nil, err |
| 125 | } |
| 126 | |
| 127 | signBytes, err := ioutil.ReadFile(jwtPrivKeyPath) |
| 128 | if err != nil { |
| 129 | plog.Errorf("failed to read private key (%s) for jwt: %s", jwtPrivKeyPath, err) |
| 130 | return nil, err |
| 131 | } |
| 132 | t.signKey, err = jwt.ParseRSAPrivateKeyFromPEM(signBytes) |
| 133 | if err != nil { |
| 134 | plog.Errorf("failed to parse private key (%s): %s", jwtPrivKeyPath, err) |
| 135 | return nil, err |
| 136 | } |
| 137 | |
| 138 | return t, nil |
| 139 | } |