mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-05-18 04:57:57 +08:00
135 lines
3.1 KiB
Go
135 lines
3.1 KiB
Go
// Copyright 2019 Yunion
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//
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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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package fernetool
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import (
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"crypto/sha1"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"time"
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"github.com/fernet/fernet-go"
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"github.com/pkg/errors"
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"yunion.io/x/onecloud/pkg/util/fileutils2"
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)
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type SFernetKeyManager struct {
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keys []*fernet.Key
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}
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func (m *SFernetKeyManager) InitEmpty() error {
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src := [32]byte{}
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dst := base64.URLEncoding.EncodeToString(src[:])
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emptyKey, err := fernet.DecodeKey(dst)
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if err != nil {
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return errors.WithMessage(err, "InitEmpty with fernet.DecodeKey")
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}
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m.keys = []*fernet.Key{emptyKey}
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return nil
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}
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func (m *SFernetKeyManager) PrimaryKeyHash() string {
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if len(m.keys) == 0 {
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return ""
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}
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dst := m.keys[0].Encode()
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sum := sha1.Sum([]byte(dst))
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return hex.EncodeToString(sum[:])
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}
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func (m *SFernetKeyManager) SetKeys(keys []*fernet.Key) {
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m.keys = keys
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}
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func (m *SFernetKeyManager) LoadKeys(path string) error {
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filesInfos, err := ioutil.ReadDir(path)
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if err != nil {
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return err
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}
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keyStrs := make([]string, 0)
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for i := range filesInfos {
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fn := filepath.Join(path, filesInfos[i].Name())
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keyBytes, err := ioutil.ReadFile(fn)
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if err != nil {
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return err
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}
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keyStrs = append(keyStrs, string(keyBytes))
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}
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if len(keyStrs) == 0 {
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return fmt.Errorf("empty fernet keys")
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}
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keys, err := fernet.DecodeKeys(keyStrs...)
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if err != nil {
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return err
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}
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m.keys = keys
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return nil
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}
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func (m *SFernetKeyManager) Decrypt(tok []byte) []byte {
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return m.VerifyAndDecrypt(tok, 0)
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}
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func (m *SFernetKeyManager) VerifyAndDecrypt(tok []byte, ttl time.Duration) []byte {
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modReturned := len(tok) % 4
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if modReturned > 0 {
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for i := 0; i < 4-modReturned; i += 1 {
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tok = append(tok, '=')
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}
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}
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return fernet.VerifyAndDecrypt(tok, ttl, m.keys)
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}
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func (m *SFernetKeyManager) InitKeys(path string, cnt int) error {
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m.keys = make([]*fernet.Key, cnt)
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for i := 0; i < cnt; i += 1 {
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key := fernet.Key{}
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err := key.Generate()
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if err != nil {
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return err
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}
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if len(path) > 0 && fileutils2.IsDir(path) {
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fn := filepath.Join(path, fmt.Sprintf("%d", i))
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err = fileutils2.FileSetContents(fn, key.Encode())
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if err != nil {
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return err
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}
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}
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m.keys[i] = &key
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}
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return nil
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}
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func (m *SFernetKeyManager) Encrypt(msg []byte) ([]byte, error) {
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hash := 0
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for i := 0; i < len(msg) && i < 10; i += 1 {
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hash += int(msg[i])
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}
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idx := hash % len(m.keys)
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tok, err := fernet.EncryptAndSign([]byte(msg), m.keys[idx])
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if err != nil {
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return nil, err
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}
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endIdx := len(tok)
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for endIdx >= 0 && tok[endIdx-1] == '=' {
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endIdx -= 1
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}
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return tok[:endIdx], nil
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}
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