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jwks.go
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jwks.go
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// Copyright 2020 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 shared
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"sort"
"time"
"github.com/lestrrat-go/jwx/jwa"
"github.com/lestrrat-go/jwx/jwk"
"github.com/pkg/errors"
)
const (
certsURLFormat = "%s/certs" // RemoteServiceProxyURL
certKeyLength = 2048
pemType = "RSA PRIVATE KEY"
)
// CreateNewKey returns keyID, private key, jwks, error
func (r *RootArgs) CreateNewKey() (keyID string, privateKey *rsa.PrivateKey, jwks *jwk.Set, err error) {
keyID = time.Now().Format(time.RFC3339)
if privateKey, err = rsa.GenerateKey(rand.Reader, certKeyLength); err != nil {
return
}
var jwkKey jwk.Key
if jwkKey, err = jwk.New(&privateKey.PublicKey); err != nil {
return
}
if err = jwkKey.Set(jwk.KeyIDKey, keyID); err != nil {
return
}
if err = jwkKey.Set(jwk.AlgorithmKey, jwa.RS256); err != nil {
return
}
jwks = &jwk.Set{
Keys: []jwk.Key{jwkKey},
}
return
}
// RotateJWKS returns a jwk.Set including passed keys and keys from existing endpoint,
// sorted by key ID and truncated per the truncate param.
func (r *RootArgs) RotateJWKS(jwks *jwk.Set, truncate int) (*jwk.Set, error) {
keys := jwks.Keys
if truncate > 1 { // if 1, just skip getting old
var oldJWKS *jwk.Set
var err error
certsURL := fmt.Sprintf(certsURLFormat, r.RemoteServiceProxyURL)
if oldJWKS, err = jwk.FetchHTTP(certsURL); err != nil {
return nil, errors.Wrapf(err, "retrieving JWKs from: %s", certsURL)
}
keys = append(keys, oldJWKS.Keys...)
}
sort.Sort(sort.Reverse(byKID(keys)))
if truncate > 0 && len(keys) > truncate {
keys = keys[:truncate]
}
return &jwk.Set{Keys: keys}, nil
}
// CreateJWKS returns keyID, private key, jwks, error
func (r *RootArgs) CreateJWKS(truncate int, verbosef FormatFn) (keyID string, pkBytes, jwksBytes []byte, err error) {
var privateKey *rsa.PrivateKey
var jwks *jwk.Set
if keyID, privateKey, jwks, err = r.CreateNewKey(); err != nil {
return
}
if jwks, err = r.RotateJWKS(jwks, truncate); err != nil {
return
}
if jwksBytes, err = json.Marshal(jwks); err != nil {
return
}
verbosef("new jkws...\n%s", string(jwksBytes))
pkBytes = pem.EncodeToMemory(&pem.Block{Type: pemType, Bytes: x509.MarshalPKCS1PrivateKey(privateKey)})
return
}
type byKID []jwk.Key
func (a byKID) Len() int { return len(a) }
func (a byKID) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a byKID) Less(i, j int) bool { return a[i].KeyID() < a[j].KeyID() }