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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
package rp
import (
"context"
"time"
jose "github.com/go-jose/go-jose/v4"
"github.com/zitadel/oidc/v3/pkg/client"
"github.com/zitadel/oidc/v3/pkg/oidc"
)
// VerifyTokens implement the Token Response Validation as defined in OIDC specification
// https://openid.net/specs/openid-connect-core-1_0.html#TokenResponseValidation
func VerifyTokens[C oidc.IDClaims](ctx context.Context, accessToken, idToken string, v *IDTokenVerifier) (claims C, err error) {
ctx, span := client.Tracer.Start(ctx, "VerifyTokens")
defer span.End()
var nilClaims C
claims, err = VerifyIDToken[C](ctx, idToken, v)
if err != nil {
return nilClaims, err
}
if err := VerifyAccessToken(accessToken, claims.GetAccessTokenHash(), claims.GetSignatureAlgorithm()); err != nil {
return nilClaims, err
}
return claims, nil
}
// VerifyIDToken validates the id token according to
// https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation
func VerifyIDToken[C oidc.Claims](ctx context.Context, token string, v *IDTokenVerifier) (claims C, err error) {
ctx, span := client.Tracer.Start(ctx, "VerifyIDToken")
defer span.End()
var nilClaims C
decrypted, err := oidc.DecryptToken(token)
if err != nil {
return nilClaims, err
}
payload, err := oidc.ParseToken(decrypted, &claims)
if err != nil {
return nilClaims, err
}
if err := oidc.CheckSubject(claims); err != nil {
return nilClaims, err
}
if err = oidc.CheckIssuer(claims, v.Issuer); err != nil {
return nilClaims, err
}
if err = oidc.CheckAudience(claims, v.ClientID); err != nil {
return nilClaims, err
}
if err = oidc.CheckAZPVerifier(claims, v.AZP); err != nil {
return nilClaims, err
}
if err = oidc.CheckSignature(ctx, decrypted, payload, claims, v.SupportedSignAlgs, v.KeySet); err != nil {
return nilClaims, err
}
if err = oidc.CheckExpiration(claims, v.Offset); err != nil {
return nilClaims, err
}
if err = oidc.CheckIssuedAt(claims, v.MaxAgeIAT, v.Offset); err != nil {
return nilClaims, err
}
if v.Nonce != nil {
if err = oidc.CheckNonce(claims, v.Nonce(ctx)); err != nil {
return nilClaims, err
}
}
if err = oidc.CheckAuthorizationContextClassReference(claims, v.ACR); err != nil {
return nilClaims, err
}
if err = oidc.CheckAuthTime(claims, v.MaxAge); err != nil {
return nilClaims, err
}
return claims, nil
}
type IDTokenVerifier oidc.Verifier
// VerifyAccessToken validates the access token according to
// https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowTokenValidation
func VerifyAccessToken(accessToken, atHash string, sigAlgorithm jose.SignatureAlgorithm) error {
if atHash == "" {
return nil
}
actual, err := oidc.ClaimHash(accessToken, sigAlgorithm)
if err != nil {
return err
}
if actual != atHash {
return oidc.ErrAtHash
}
return nil
}
// NewIDTokenVerifier returns a oidc.Verifier suitable for ID token verification.
func NewIDTokenVerifier(issuer, clientID string, keySet oidc.KeySet, options ...VerifierOption) *IDTokenVerifier {
v := &IDTokenVerifier{
Issuer: issuer,
ClientID: clientID,
KeySet: keySet,
Offset: time.Second,
Nonce: func(_ context.Context) string {
return ""
},
AZP: oidc.DefaultAZPVerifier(clientID),
}
for _, opts := range options {
opts(v)
}
return v
}
// VerifierOption is the type for providing dynamic options to the IDTokenVerifier
type VerifierOption func(*IDTokenVerifier)
// WithIssuedAtOffset mitigates the risk of iat to be in the future
// because of clock skews with the ability to add an offset to the current time
func WithIssuedAtOffset(offset time.Duration) VerifierOption {
return func(v *IDTokenVerifier) {
v.Offset = offset
}
}
// WithIssuedAtMaxAge provides the ability to define the maximum duration between iat and now
func WithIssuedAtMaxAge(maxAge time.Duration) VerifierOption {
return func(v *IDTokenVerifier) {
v.MaxAgeIAT = maxAge
}
}
// WithNonce sets the function to check the nonce
func WithNonce(nonce func(context.Context) string) VerifierOption {
return func(v *IDTokenVerifier) {
v.Nonce = nonce
}
}
// WithACRVerifier sets the verifier for the acr claim
func WithACRVerifier(verifier oidc.ACRVerifier) VerifierOption {
return func(v *IDTokenVerifier) {
v.ACR = verifier
}
}
// WithAZPVerifier sets the verifier for the azp claim
func WithAZPVerifier(verifier oidc.AZPVerifier) VerifierOption {
return func(v *IDTokenVerifier) {
v.AZP = verifier
}
}
// WithAuthTimeMaxAge provides the ability to define the maximum duration between auth_time and now
func WithAuthTimeMaxAge(maxAge time.Duration) VerifierOption {
return func(v *IDTokenVerifier) {
v.MaxAge = maxAge
}
}
// WithSupportedSigningAlgorithms overwrites the default RS256 signing algorithm
func WithSupportedSigningAlgorithms(algs ...string) VerifierOption {
return func(v *IDTokenVerifier) {
v.SupportedSignAlgs = algs
}
}
|
