130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
package encfs
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"os"
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"strings"
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"sync"
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"time"
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)
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const LOCAL_MINI_KMS_ADDRESS = "LOCAL_MINI_KMS_ADDRESS"
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const DISABLE_ENCRYPTION_MASTER_KEY = "DISABLE_ENCRYPTION_MASTER_KEY"
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const ENCRYPTED_ENCRYPTION_MASTER_KEY = "ENCRYPTED_ENCRYPTION_MASTER_KEY"
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type MultiViewValue struct {
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ValueHex string `json:"value_hex"`
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ValueBase64 string `json:"value_base64"`
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}
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type EncryptRequest struct {
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EncryptedValue string `json:"encrypted_value"`
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}
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var cachedcEncryptionMasterKey *EncryptionMasterKey = nil
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var cachedcEncryptionMasterKeyLock sync.Mutex
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func GetCachedEncryptionMasterKey() (*EncryptionMasterKey, error) {
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cachedcEncryptionMasterKeyLock.Lock()
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defer cachedcEncryptionMasterKeyLock.Unlock()
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if cachedcEncryptionMasterKey == nil {
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var err error
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cachedcEncryptionMasterKey, err = GetEncryptionMasterKey()
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if err != nil {
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return nil, err
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}
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}
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return cachedcEncryptionMasterKey, nil
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}
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func GetEncryptionMasterKey() (*EncryptionMasterKey, error) {
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disableEncryptionMasterKey := os.Getenv(DISABLE_ENCRYPTION_MASTER_KEY)
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if disableEncryptionMasterKey == "1" ||
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disableEncryptionMasterKey == "on" ||
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disableEncryptionMasterKey == "yes" ||
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disableEncryptionMasterKey == "true" {
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return nil, nil
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}
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encryptedEncryptionMasterKey := os.Getenv(ENCRYPTED_ENCRYPTION_MASTER_KEY)
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if encryptedEncryptionMasterKey == "" {
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fmt.Println("[ERROR] encrypted encryption master key is not present")
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return nil, errors.New("encrypted encryption master key is not present")
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}
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key, err := DecryptBytes(encryptedEncryptionMasterKey)
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if err != nil {
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return nil, err
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}
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return &EncryptionMasterKey{
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key: key,
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}, nil
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}
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func DecryptBytes(encryptedValue string) ([]byte, error) {
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localMiniKmsAddress := os.Getenv(LOCAL_MINI_KMS_ADDRESS)
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if localMiniKmsAddress == "" {
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localMiniKmsAddress = "127.0.0.1:5567"
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}
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if !strings.HasPrefix(strings.ToLower(localMiniKmsAddress), "http://") {
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localMiniKmsAddress = fmt.Sprintf("http://%s", localMiniKmsAddress)
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}
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multiViewValue, err := Decrypt(localMiniKmsAddress, encryptedValue)
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if err != nil {
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fmt.Println("[ERROR] Decrypt from", localMiniKmsAddress, "failed, error:", err)
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return nil, err
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}
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valueBytes, err := hex.DecodeString(multiViewValue.ValueHex)
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if err != nil {
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return nil, err
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}
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return valueBytes, nil
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}
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func Decrypt(endpoint, encryptedValue string) (*MultiViewValue, error) {
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encryptRequest := EncryptRequest{
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EncryptedValue: encryptedValue,
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}
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encryptRequestBytes, err := json.Marshal(&encryptRequest)
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if err != nil {
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return nil, err
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}
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encryptRequestReader := bytes.NewReader(encryptRequestBytes)
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client := http.Client{
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Timeout: 5 * time.Second,
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}
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encryptResponse, err := client.Post(joinEnpointPath(endpoint, "/decrypt"), "application/json", encryptRequestReader)
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if err != nil {
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return nil, err
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}
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if encryptResponse.StatusCode != 200 {
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return nil, fmt.Errorf("decrypt failed, http status: %d", encryptResponse.StatusCode)
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}
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encryptResponseBodyBytes, err := io.ReadAll(encryptResponse.Body)
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if err != nil {
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return nil, err
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}
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var multiViewValue MultiViewValue
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err = json.Unmarshal(encryptResponseBodyBytes, &multiViewValue)
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if err != nil {
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return nil, err
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}
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return &multiViewValue, nil
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}
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func joinEnpointPath(endpoint, path string) string {
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endpointEndsWithSlash := strings.HasSuffix(endpoint, "/")
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pathStartsWithSlash := strings.HasPrefix(path, "/")
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if endpointEndsWithSlash && pathStartsWithSlash {
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return fmt.Sprintf("%s%s", endpoint, path[1:])
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} else if endpointEndsWithSlash || pathStartsWithSlash {
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return fmt.Sprintf("%s%s", endpoint, path)
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} else {
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return fmt.Sprintf("%s/%s", endpoint, path)
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}
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}
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