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fix: get remote keys if no cached key matches

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This commit is contained in:
Livio Amstutz 2021-09-14 12:07:24 +02:00
parent 928526286b
commit 0829207a39
1 changed files with 18 additions and 5 deletions
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23
pkg/client/rp/jwks.go
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@ -92,12 +92,21 @@ func (r *remoteKeySet) VerifySignature(ctx context.Context, jws *jose.JSONWebSig
if payload != nil {
return payload, nil
}
if err != nil && keyID != "" || r.skipRemoteCheck {
if err != nil {
return nil, err
}
return r.verifySignatureRemote(ctx, jws, keyID, alg)
}
//verifySignatureCached checks for a matching key in the cached key list
//
//if there is only one possible, it tries to verify the signature and will return the payload if successful
//
//it only returns an error if signature validation fails and if either:
// - both (JWT and JWK) kid match
// - or both are empty and skipRemoteCheck is set to true
//
//otherwise it will return no error (so remote keys will be loaded)
func (r *remoteKeySet) verifySignatureCached(jws *jose.JSONWebSignature, keyID, alg string) ([]byte, error) {
keys := r.keysFromCache()
if len(keys) == 0 {
@ -105,14 +114,18 @@ func (r *remoteKeySet) verifySignatureCached(jws *jose.JSONWebSignature, keyID,
}
key, err := oidc.FindMatchingKey(keyID, oidc.KeyUseSignature, alg, keys...)
if err != nil {
//ignore error here, try with remote keys
//no key / multiple found, try with remote keys
return nil, nil //nolint:nilerr
}
payload, err := jws.Verify(&key)
if err != nil {
return nil, fmt.Errorf("signature verification failed: %w", err)
}
if payload != nil {
return payload, nil
}
if key.KeyID != keyID || (key.KeyID == "" && keyID == "" && !r.skipRemoteCheck) {
//no exact key match, try getting better match with remote keys
return nil, nil
}
return nil, fmt.Errorf("signature verification failed: %w", err)
}
func (r *remoteKeySet) verifySignatureRemote(ctx context.Context, jws *jose.JSONWebSignature, keyID, alg string) ([]byte, error) {