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key_store.go
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key_store.go
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// Copyright 2024 Dimitrij Drus <dadrus@gmx.de>
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package tlsx
import (
"crypto/tls"
"sync"
"github.com/rs/zerolog"
"github.com/dadrus/heimdall/internal/heimdall"
"github.com/dadrus/heimdall/internal/keystore"
"github.com/dadrus/heimdall/internal/x/errorchain"
)
//go:generate mockery --name compatibilityChecker --structname compatibilityCheckerMock --inpackage --testonly
type compatibilityChecker interface {
SupportsCertificate(c *tls.Certificate) error
}
type keyStore struct {
path string
password string
keyID string
tlsCert *tls.Certificate
mut sync.Mutex
}
func newTLSKeyStore(path, keyID, password string) (*keyStore, error) {
ks := &keyStore{
path: path,
keyID: keyID,
password: password,
}
if err := ks.load(); err != nil {
return nil, err
}
return ks, nil
}
func (cr *keyStore) load() error {
if len(cr.path) == 0 {
return errorchain.NewWithMessage(heimdall.ErrConfiguration, "no path to tls key store specified")
}
ks, err := keystore.NewKeyStoreFromPEMFile(cr.path, cr.password)
if err != nil {
return errorchain.NewWithMessage(heimdall.ErrInternal, "failed loading keystore").
CausedBy(err)
}
var entry *keystore.Entry
if len(cr.keyID) != 0 {
entry, err = ks.GetKey(cr.keyID)
} else {
entry, err = ks.Entries()[0], nil
}
if err != nil {
return errorchain.NewWithMessage(heimdall.ErrConfiguration,
"failed retrieving key from key store").CausedBy(err)
}
cert, err := entry.TLSCertificate()
if err != nil {
return errorchain.NewWithMessage(heimdall.ErrConfiguration,
"key store entry is not suitable for TLS").CausedBy(err)
}
cr.mut.Lock()
cr.tlsCert = &cert
cr.mut.Unlock()
return nil
}
func (cr *keyStore) certificate(cc compatibilityChecker) (*tls.Certificate, error) {
var cert *tls.Certificate
cr.mut.Lock()
cert = cr.tlsCert
cr.mut.Unlock()
if err := cc.SupportsCertificate(cert); err != nil {
return nil, err
}
return cert, nil
}
func (cr *keyStore) OnChanged(log zerolog.Logger) {
err := cr.load()
if err != nil {
log.Warn().Err(err).
Str("_file", cr.path).
Msg("TLS key store reload failed")
} else {
log.Info().
Str("_file", cr.path).
Msg("TLS key store reloaded")
}
}