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// Copyright 2022 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 jwt
import (
"fmt"
"github.com/tink-crypto/tink-go/v2/internal/internalapi"
"github.com/tink-crypto/tink-go/v2/internal/internalregistry"
"github.com/tink-crypto/tink-go/v2/internal/monitoringutil"
"github.com/tink-crypto/tink-go/v2/internal/primitiveset"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/monitoring"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// NewMAC generates a new instance of the JWT MAC primitive.
func NewMAC(handle *keyset.Handle) (MAC, error) {
if handle == nil {
return nil, fmt.Errorf("keyset handle can't be nil")
}
ps, err := keyset.Primitives[*macWithKID](handle, internalapi.Token{})
if err != nil {
return nil, fmt.Errorf("jwt_mac_factory: cannot obtain primitive set: %v", err)
}
return newWrappedJWTMAC(ps)
}
// wrappedJWTMAC is a JWTMAC implementation that uses the underlying primitive set for JWT MAC.
type wrappedJWTMAC struct {
ps *primitiveset.PrimitiveSet[*macWithKID]
computeLogger monitoring.Logger
verifyLogger monitoring.Logger
}
var _ MAC = (*wrappedJWTMAC)(nil)
func newWrappedJWTMAC(ps *primitiveset.PrimitiveSet[*macWithKID]) (*wrappedJWTMAC, error) {
for _, primitives := range ps.Entries {
for _, p := range primitives {
if p.PrefixType != tinkpb.OutputPrefixType_RAW && p.PrefixType != tinkpb.OutputPrefixType_TINK {
return nil, fmt.Errorf("jwt_mac_factory: invalid OutputPrefixType: %s", p.PrefixType)
}
}
}
computeLogger, verifyLogger, err := createLoggers(ps)
if err != nil {
return nil, err
}
return &wrappedJWTMAC{ps: ps, computeLogger: computeLogger, verifyLogger: verifyLogger}, nil
}
func createLoggers(ps *primitiveset.PrimitiveSet[*macWithKID]) (monitoring.Logger, monitoring.Logger, error) {
if len(ps.Annotations) == 0 {
return &monitoringutil.DoNothingLogger{}, &monitoringutil.DoNothingLogger{}, nil
}
client := internalregistry.GetMonitoringClient()
keysetInfo, err := monitoringutil.KeysetInfoFromPrimitiveSet(ps)
if err != nil {
return nil, nil, err
}
computeLogger, err := client.NewLogger(&monitoring.Context{
Primitive: "jwtmac",
APIFunction: "compute",
KeysetInfo: keysetInfo,
})
if err != nil {
return nil, nil, err
}
verifyLogger, err := client.NewLogger(&monitoring.Context{
Primitive: "jwtmac",
APIFunction: "verify",
KeysetInfo: keysetInfo,
})
if err != nil {
return nil, nil, err
}
return computeLogger, verifyLogger, nil
}
func (w *wrappedJWTMAC) ComputeMACAndEncode(token *RawJWT) (string, error) {
primary := w.ps.Primary
signedToken, err := primary.Primitive.ComputeMACAndEncodeWithKID(token, keyID(primary.KeyID, primary.PrefixType))
if err != nil {
w.computeLogger.LogFailure()
return "", err
}
w.computeLogger.Log(primary.KeyID, 1)
return signedToken, nil
}
func (w *wrappedJWTMAC) VerifyMACAndDecode(compact string, validator *Validator) (*VerifiedJWT, error) {
var interestingErr error
for _, s := range w.ps.Entries {
for _, e := range s {
verifiedJWT, err := e.Primitive.VerifyMACAndDecodeWithKID(compact, validator, keyID(e.KeyID, e.PrefixType))
if err == nil {
w.verifyLogger.Log(e.KeyID, 1)
return verifiedJWT, nil
}
if err != errJwtVerification {
// any error that is not the generic errJwtVerification is considered interesting
interestingErr = err
}
}
}
w.verifyLogger.LogFailure()
if interestingErr != nil {
return nil, interestingErr
}
return nil, errJwtVerification
}
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