mirror of
https://github.com/Luzifer/envrun.git
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73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"io"
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"github.com/ProtonMail/go-crypto/openpgp"
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"github.com/ProtonMail/go-crypto/openpgp/armor"
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openssl "github.com/Luzifer/go-openssl/v4"
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)
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type decryptMethod func(body []byte, passphrase string) ([]byte, error)
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func decryptMethodFromName(name string) (decryptMethod, error) {
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switch name {
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case "gpg-symmetric":
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return decryptGPGSymmetric, nil
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case "openssl-md5":
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return decryptOpenSSL(openssl.BytesToKeyMD5), nil
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case "openssl-sha256":
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return decryptOpenSSL(openssl.BytesToKeySHA256), nil
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default:
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return nil, fmt.Errorf("decrypt method %q not found", name)
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}
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}
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func decryptGPGSymmetric(body []byte, passphrase string) ([]byte, error) {
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var msgReader io.Reader
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block, err := armor.Decode(bytes.NewReader(body))
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switch err {
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case nil:
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msgReader = block.Body
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case io.EOF:
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msgReader = bytes.NewReader(body)
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default:
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return nil, fmt.Errorf("reading armor: %w", err)
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}
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var passwordRetry bool
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md, err := openpgp.ReadMessage(msgReader, nil, func(keys []openpgp.Key, symmetric bool) ([]byte, error) {
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if passwordRetry {
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return nil, fmt.Errorf("wrong passphrase supplied")
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}
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passwordRetry = true
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return []byte(passphrase), nil
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}, nil)
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if err != nil {
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return nil, fmt.Errorf("decrypting message: %w", err)
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}
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data, err := io.ReadAll(md.UnverifiedBody)
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if err != nil {
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return nil, fmt.Errorf("reading GPG body: %w", err)
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}
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return data, nil
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}
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func decryptOpenSSL(kdf openssl.CredsGenerator) decryptMethod {
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return func(body []byte, passphrase string) ([]byte, error) {
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data, err := openssl.New().DecryptBytes(cfg.Password, body, kdf)
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if err != nil {
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return nil, fmt.Errorf("decrypting data: %w", err)
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}
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return data, nil
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}
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}
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