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helper.go
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helper.go
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// Copyright © 2022 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package jwk
import (
"context"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"sync"
"github.com/ory/x/josex"
"github.com/ory/x/errorsx"
"github.com/ory/hydra/v2/x"
jose "github.com/go-jose/go-jose/v3"
"github.com/pkg/errors"
)
var mapLock sync.RWMutex
var locks = map[string]*sync.RWMutex{}
func getLock(set string) *sync.RWMutex {
mapLock.Lock()
defer mapLock.Unlock()
if _, ok := locks[set]; !ok {
locks[set] = new(sync.RWMutex)
}
return locks[set]
}
func EnsureAsymmetricKeypairExists(ctx context.Context, r InternalRegistry, alg, set string) error {
_, err := GetOrGenerateKeys(ctx, r, r.KeyManager(), set, set, alg)
return err
}
func GetOrGenerateKeys(ctx context.Context, r InternalRegistry, m Manager, set, kid, alg string) (private *jose.JSONWebKey, err error) {
getLock(set).Lock()
defer getLock(set).Unlock()
keys, err := m.GetKeySet(ctx, set)
if errors.Is(err, x.ErrNotFound) || keys != nil && len(keys.Keys) == 0 {
r.Logger().Warnf("JSON Web Key Set \"%s\" does not exist yet, generating new key pair...", set)
keys, err = m.GenerateAndPersistKeySet(ctx, set, kid, alg, "sig")
if err != nil {
return nil, err
}
} else if err != nil {
return nil, err
}
privKey, privKeyErr := FindPrivateKey(keys)
if privKeyErr == nil {
return privKey, nil
} else {
r.Logger().WithField("jwks", set).Warnf("JSON Web Key not found in JSON Web Key Set %s, generating new key pair...", set)
keys, err = m.GenerateAndPersistKeySet(ctx, set, kid, alg, "sig")
if err != nil {
return nil, err
}
privKey, err := FindPrivateKey(keys)
if err != nil {
return nil, err
}
return privKey, nil
}
}
func First(keys []jose.JSONWebKey) *jose.JSONWebKey {
if len(keys) == 0 {
return nil
}
return &keys[0]
}
func FindPublicKey(set *jose.JSONWebKeySet) (key *jose.JSONWebKey, err error) {
keys := ExcludePrivateKeys(set)
if len(keys.Keys) == 0 {
return nil, errors.New("key not found")
}
return First(keys.Keys), nil
}
func FindPrivateKey(set *jose.JSONWebKeySet) (key *jose.JSONWebKey, err error) {
keys := ExcludePublicKeys(set)
if len(keys.Keys) == 0 {
return nil, errors.New("key not found")
}
return First(keys.Keys), nil
}
func ExcludePublicKeys(set *jose.JSONWebKeySet) *jose.JSONWebKeySet {
keys := new(jose.JSONWebKeySet)
for _, k := range set.Keys {
if !k.IsPublic() {
keys.Keys = append(keys.Keys, k)
}
}
return keys
}
func ExcludePrivateKeys(set *jose.JSONWebKeySet) *jose.JSONWebKeySet {
keys := new(jose.JSONWebKeySet)
for i := range set.Keys {
keys.Keys = append(keys.Keys, josex.ToPublicKey(&set.Keys[i]))
}
return keys
}
func ExcludeOpaquePrivateKeys(set *jose.JSONWebKeySet) *jose.JSONWebKeySet {
keys := new(jose.JSONWebKeySet)
for i := range set.Keys {
if _, opaque := set.Keys[i].Key.(jose.OpaqueSigner); opaque {
keys.Keys = append(keys.Keys, josex.ToPublicKey(&set.Keys[i]))
} else {
keys.Keys = append(keys.Keys, set.Keys[i])
}
}
return keys
}
func PEMBlockForKey(key interface{}) (*pem.Block, error) {
switch k := key.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}, nil
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, errorsx.WithStack(err)
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}, nil
case ed25519.PrivateKey:
b, err := x509.MarshalPKCS8PrivateKey(k)
if err != nil {
return nil, errorsx.WithStack(err)
}
return &pem.Block{Type: "PRIVATE KEY", Bytes: b}, nil
default:
return nil, errors.New("Invalid key type")
}
}