This repository has been archived by the owner on May 23, 2023. It is now read-only.
/
jwt.go
147 lines (128 loc) · 3.6 KB
/
jwt.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
// Copyright 2018 Google LLC
//
// 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"
"encoding/json"
"path"
"sync"
"time"
adapterContext "github.com/apigee/istio-mixer-adapter/adapter/context"
"github.com/apigee/istio-mixer-adapter/adapter/util"
"github.com/lestrrat/go-jwx/jwk"
"github.com/lestrrat/go-jwx/jws"
"github.com/lestrrat/go-jwx/jwt"
"github.com/pkg/errors"
"istio.io/istio/mixer/pkg/adapter"
)
const (
certsPath = "/certs"
acceptableSkew = 10 * time.Second
)
func newJWTManager(pollInterval time.Duration) *jwtManager {
return &jwtManager{
jwkSets: sync.Map{},
pollInterval: pollInterval,
}
}
// An jwtManager handles all of the various JWT authentication functionality.
type jwtManager struct {
jwkSets sync.Map
pollInterval time.Duration
cancelPolling context.CancelFunc
}
func (a *jwtManager) start(env adapter.Env) {
if a.pollInterval > 0 {
env.Logger().Debugf("starting cert polling")
looper := util.Looper{
Env: env,
Backoff: util.NewExponentialBackoff(200*time.Millisecond, a.pollInterval, 2, true),
}
ctx, cancel := context.WithCancel(context.Background())
a.cancelPolling = cancel
looper.Start(ctx, a.refresh, a.pollInterval, func(err error) error {
env.Logger().Errorf("Error refreshing cert set: %s", err)
return nil
})
}
}
func (a *jwtManager) stop() {
if a != nil && a.cancelPolling != nil {
a.cancelPolling()
}
}
func (a *jwtManager) ensureSet(url string) error {
set, err := jwk.FetchHTTP(url)
if err != nil {
return err
}
a.jwkSets.Store(url, set)
return nil
}
func (a *jwtManager) refresh(ctx context.Context) error {
var errRet error
a.jwkSets.Range(func(urlI interface{}, setI interface{}) bool {
if err := a.ensureSet(urlI.(string)); err != nil {
errRet = err
}
return ctx.Err() == nil // if not canceled, keep going
})
return errRet
}
func (a *jwtManager) jwkSet(ctx adapterContext.Context) (*jwk.Set, error) {
jwksURL := *ctx.CustomerBase()
jwksURL.Path = path.Join(jwksURL.Path, certsPath)
url := jwksURL.String()
if _, ok := a.jwkSets.Load(url); !ok {
if err := a.ensureSet(url); err != nil {
return nil, err
}
}
set, _ := a.jwkSets.Load(url)
return set.(*jwk.Set), nil
}
func (a *jwtManager) parseJWT(ctx adapterContext.Context, raw string, verify bool) (map[string]interface{}, error) {
if verify {
set, err := a.jwkSet(ctx)
if err != nil {
return nil, err
}
// verify against public keys
_, err = jws.VerifyWithJWKSet([]byte(raw), set, nil)
if err != nil {
return nil, err
}
}
if verify {
// verify fields
token, err := jwt.ParseString(raw)
if err != nil {
return nil, errors.Wrap(err, "invalid jws message")
}
err = token.Verify(jwt.WithAcceptableSkew(acceptableSkew))
if err != nil {
return nil, errors.Wrap(err, "invalid jws message")
}
}
// get claims
m, err := jws.ParseString(raw)
if err != nil {
return nil, errors.Wrap(err, "invalid jws message")
}
var claims map[string]interface{}
if err := json.Unmarshal(m.Payload(), &claims); err != nil {
return nil, errors.Wrap(err, "failed to parse claims")
}
return claims, nil
}