cmd/lncli: add changepassword command

cmd/lncli/commands.go

@@ -1382,6 +1382,66 @@ func unlock(ctx *cli.Context) error {
 	return nil
 }
 
+var changePasswordCommand = cli.Command{
+	Name:     "changepassword",
+	Category: "Startup",
+	Usage:    "Change an encrypted wallet's password at startup.",
+	Description: `
+	The changepassword command is used to Change lnd's encrypted wallet's
+	password. It will automatically unlock the daemon if the password change
+	is successful.
+
+	If one did not specify a password for their wallet (running lnd with
+	--noencryptwallet), one must restart their daemon without
+	--noencryptwallet and use this command. The "current password" field
+	should be left empty.
+	`,
+	Action: actionDecorator(changePassword),
+}
+
+func changePassword(ctx *cli.Context) error {
+	ctxb := context.Background()
+	client, cleanUp := getWalletUnlockerClient(ctx)
+	defer cleanUp()
+
+	fmt.Printf("Input current wallet password: ")
+	currentPw, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return err
+	}
+	fmt.Println()
+
+	fmt.Printf("Input new wallet password: ")
+	newPw, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return err
+	}
+	fmt.Println()
+
+	fmt.Printf("Confirm new wallet password: ")
+	confirmPw, err := terminal.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return err
+	}
+	fmt.Println()
+
+	if !bytes.Equal(newPw, confirmPw) {
+		return fmt.Errorf("passwords don't match")
+	}
+
+	req := &lnrpc.ChangePasswordRequest{
+		CurrentPassword: currentPw,
+		NewPassword:     newPw,
+	}
+
+	_, err = client.ChangePassword(ctxb, req)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 var walletBalanceCommand = cli.Command{
 	Name:     "walletbalance",
 	Category: "Wallet",

cmd/lncli/main.go

@@ -194,6 +194,7 @@ func main() {
 	app.Commands = []cli.Command{
 		createCommand,
 		unlockCommand,
+		changePasswordCommand,
 		newAddressCommand,
 		sendManyCommand,
 		sendCoinsCommand,