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fulcioroots.go
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/
fulcioroots.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 fulcioroots
import (
"bytes"
"crypto/x509"
"fmt"
"os"
"sync"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/fulcioroots"
)
var (
rootsOnce sync.Once
roots *x509.CertPool
intermediates *x509.CertPool
singletonRootErr error
)
const altRoot = "SIGSTORE_ROOT_FILE"
// Get returns the Fulcio root certificate.
//
// If the SIGSTORE_ROOT_FILE environment variable is set, the root config found
// there will be used instead of the normal Fulcio roots.
func Get() (*x509.CertPool, error) {
rootsOnce.Do(func() {
roots, intermediates, singletonRootErr = initRoots()
})
return roots, singletonRootErr
}
// GetIntermediates returns the Fulcio intermediate certificates.
//
// If the SIGSTORE_ROOT_FILE environment variable is set, the root config found
// there will be used instead of the normal Fulcio intermediates.
func GetIntermediates() (*x509.CertPool, error) {
rootsOnce.Do(func() {
roots, intermediates, singletonRootErr = initRoots()
})
return intermediates, singletonRootErr
}
func initRoots() (*x509.CertPool, *x509.CertPool, error) {
rootPool := x509.NewCertPool()
// intermediatePool should be nil if no intermediates are found
var intermediatePool *x509.CertPool
rootEnv := os.Getenv(altRoot)
if rootEnv != "" {
raw, err := os.ReadFile(rootEnv)
if err != nil {
return nil, nil, fmt.Errorf("error reading root PEM file: %w", err)
}
certs, err := cryptoutils.UnmarshalCertificatesFromPEM(raw)
if err != nil {
return nil, nil, fmt.Errorf("error unmarshalling certificates: %w", err)
}
for _, cert := range certs {
// root certificates are self-signed
if bytes.Equal(cert.RawSubject, cert.RawIssuer) {
rootPool.AddCert(cert)
} else {
if intermediatePool == nil {
intermediatePool = x509.NewCertPool()
}
intermediatePool.AddCert(cert)
}
}
} else {
var err error
rootPool, err = fulcioroots.Get()
if err != nil {
return nil, nil, err
}
intermediatePool, err = fulcioroots.GetIntermediates()
if err != nil {
return nil, nil, err
}
}
return rootPool, intermediatePool, nil
}