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oidc refresh token: validate nonce only if set

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As clarified in OpenID core spec errata 2, section 12.2

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>
This commit is contained in:
Nicola Murino 2024-07-01 19:06:11 +02:00
parent 55be9f0b9c
commit 64a2f7aa4f
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GPG key ID: 935D2952DEC4EECF
2 changed files with 10 additions and 6 deletions
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10
internal/httpd/oidc.go
View file

@ -16,6 +16,7 @@ package httpd
import (
"context"
"encoding/hex"
"errors"
"fmt"
"net/http"
@ -203,7 +204,7 @@ type oidcPendingAuth struct {
func newOIDCPendingAuth(audience tokenAudience) oidcPendingAuth {
return oidcPendingAuth{
State: xid.New().String(),
Nonce: xid.New().String(),
Nonce: hex.EncodeToString(util.GenerateRandomBytes(20)),
Audience: audience,
IssuedAt: util.GetTimeAsMsSinceEpoch(time.Now()),
}
@ -345,14 +346,15 @@ func (t *oidcToken) refresh(ctx context.Context, config OAuth2Config, verifier O
logger.Debug(logSender, "", "unable to verify refreshed id token for cookie %q: %v", t.Cookie, err)
return err
}
if idToken.Nonce != t.Nonce {
logger.Debug(logSender, "", "unable to verify refreshed id token for cookie %q: nonce mismatch", t.Cookie)
if idToken.Nonce != "" && idToken.Nonce != t.Nonce {
logger.Warn(logSender, "", "unable to verify refreshed id token for cookie %q: nonce mismatch, expected: %q, actual: %q",
t.Cookie, t.Nonce, idToken.Nonce)
return errors.New("the refreshed token nonce mismatch")
}
claims := make(map[string]any)
err = idToken.Claims(&claims)
if err != nil {
logger.Debug(logSender, "", "unable to get refreshed id token claims for cookie %q: %v", t.Cookie, err)
logger.Warn(logSender, "", "unable to get refreshed id token claims for cookie %q: %v", t.Cookie, err)
return err
}
sid, ok := claims["sid"].(string)

6
internal/httpd/oidc_test.go
View file

@ -626,7 +626,9 @@ func TestOIDCRefreshToken(t *testing.T) {
},
}
verifier = mockOIDCVerifier{
token: &oidc.IDToken{},
token: &oidc.IDToken{
Nonce: xid.New().String(), // nonce is different from the expected one
},
}
err = token.refresh(context.Background(), &config, &verifier, r)
if assert.Error(t, err) {
@ -634,7 +636,7 @@ func TestOIDCRefreshToken(t *testing.T) {
}
verifier = mockOIDCVerifier{
token: &oidc.IDToken{
Nonce: token.Nonce,
Nonce: "", // empty token is fine on refresh but claims are not set
},
}
err = token.refresh(context.Background(), &config, &verifier, r)