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fileca.go
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fileca.go
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// Copyright 2021 The Sigstore Authors.
//
// 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 fileca
import (
"crypto"
"crypto/x509"
"github.com/fsnotify/fsnotify"
"github.com/sigstore/fulcio/pkg/ca"
"github.com/sigstore/fulcio/pkg/ca/baseca"
)
type fileCA struct {
baseca.BaseCA
}
// NewFileCA returns a file backed certificate authority. Expects paths to a
// certificate and key that are PEM encoded. The key must be encrypted
// according to RFC 1423
func NewFileCA(certPath, keyPath, keyPass string, watch bool) (ca.CertificateAuthority, error) {
var fca fileCA
var err error
fca.SignerWithChain, err = loadKeyPair(certPath, keyPath, keyPass)
if err != nil {
return nil, err
}
if watch {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
err = watcher.Add(certPath)
if err != nil {
return nil, err
}
err = watcher.Add(keyPath)
if err != nil {
return nil, err
}
go ioWatch(certPath, keyPath, keyPass, watcher, fca.updateX509KeyPair)
}
return &fca, err
}
func (fca *fileCA) updateX509KeyPair(certs []*x509.Certificate, signer crypto.Signer) {
scm := fca.SignerWithChain.(*ca.SignerCertsMutex)
scm.Lock()
defer scm.Unlock()
// NB: We use a lock to ensure a reading thread can't get a mismatching
// cert / key pair by reading the attributes halfway through the update
// below.
scm.Certs = certs
scm.Signer = signer
}