91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
// Copyright 2026 Alibaba Group
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build darwin || linux
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package keychain
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import (
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"crypto/cipher"
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"crypto/rand"
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"fmt"
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"os"
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"path/filepath"
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"github.com/google/uuid"
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)
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type keychainGCMFactory func(cipher.Block) (cipher.AEAD, error)
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var (
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keychainMkdirAll = os.MkdirAll
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keychainWriteFile = os.WriteFile
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keychainUserHomeDir = os.UserHomeDir
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keychainRandRead = rand.Read
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)
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// fileDEK retrieves or generates a Data Encryption Key stored as a plain
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// file under the platform storage directory. Shared by Linux (default) and
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// the macOS sandbox fallback path (DWS_DISABLE_KEYCHAIN=1).
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func fileDEK(service string) ([]byte, error) {
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dir := StorageDir(service)
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keyPath := filepath.Join(dir, "dek")
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key, err := keychainReadFile(keyPath)
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if err == nil && len(key) == dekBytes {
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return key, nil
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}
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if err := keychainMkdirAll(dir, 0700); err != nil {
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return nil, fmt.Errorf("create keychain dir: %w", err)
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}
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key = make([]byte, dekBytes)
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if _, err := keychainRandRead(key); err != nil {
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return nil, fmt.Errorf("generate dek: %w", err)
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}
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tmpKeyPath := filepath.Join(dir, "dek."+uuid.New().String()+".tmp")
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defer keychainRemove(tmpKeyPath)
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if err := keychainWriteFile(tmpKeyPath, key, 0600); err != nil {
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return nil, fmt.Errorf("write dek: %w", err)
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}
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if err := keychainRename(tmpKeyPath, keyPath); err != nil {
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// If rename fails, another process might have created it. Try reading again.
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existingKey, readErr := keychainReadFile(keyPath)
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if readErr == nil && len(existingKey) == dekBytes {
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return existingKey, nil
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}
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return nil, fmt.Errorf("save dek: %w", err)
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}
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return key, nil
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}
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func fileDEKReadOnly(service string) ([]byte, error) {
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keyPath := filepath.Join(StorageDir(service), "dek")
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key, err := keychainReadFile(keyPath)
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if err == nil && len(key) == dekBytes {
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return key, nil
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}
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if err != nil {
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if os.IsNotExist(err) {
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return nil, ErrDEKMissing
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}
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return nil, fmt.Errorf("read dek: %w", err)
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}
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return nil, fmt.Errorf("read dek: %w", ErrDEKMissing)
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}
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