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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package distsign
import (
"crypto/ed25519"
"embed"
"errors"
"fmt"
"path"
"path/filepath"
"sync"
)
//go:embed roots
var rootsFS embed.FS
var roots = sync.OnceValue(func() []ed25519.PublicKey {
roots, err := parseRoots()
if err != nil {
panic(err)
}
return roots
})
func parseRoots() ([]ed25519.PublicKey, error) {
files, err := rootsFS.ReadDir("roots")
if err != nil {
return nil, err
}
var keys []ed25519.PublicKey
for _, f := range files {
if !f.Type().IsRegular() {
continue
}
if filepath.Ext(f.Name()) != ".pem" {
continue
}
raw, err := rootsFS.ReadFile(path.Join("roots", f.Name()))
if err != nil {
return nil, err
}
key, err := parseSinglePublicKey(raw, pemTypeRootPublic)
if err != nil {
return nil, fmt.Errorf("parsing root key %q: %w", f.Name(), err)
}
keys = append(keys, key)
}
if len(keys) == 0 {
return nil, errors.New("no embedded root keys, please check clientupdate/distsign/roots/")
}
return keys, nil
}
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