src/qt/askpassphrasedialog.cpp
#include "askpassphrasedialog.h"
#include "ui_askpassphrasedialog.h"
#include "guiconstants.h"
#include "walletmodel.h"
#include <QMessageBox>
#include <QPushButton>
#include <QKeyEvent>
extern bool fWalletUnlockStakingOnly;
extern bool fWalletUnlockMessagingEnabled;
AskPassphraseDialog::AskPassphraseDialog(Mode mode, QWidget *parent) :
QDialog(parent),
ui(new Ui::AskPassphraseDialog),
mode(mode),
model(0),
fCapsLock(false)
{
ui->setupUi(this);
ui->passEdit1->setMaxLength(MAX_PASSPHRASE_SIZE);
ui->passEdit2->setMaxLength(MAX_PASSPHRASE_SIZE);
ui->passEdit3->setMaxLength(MAX_PASSPHRASE_SIZE);
// Setup Caps Lock detection.
ui->passEdit1->installEventFilter(this);
ui->passEdit2->installEventFilter(this);
ui->passEdit3->installEventFilter(this);
ui->stakingCheckBox->setChecked(fWalletUnlockStakingOnly);
ui->messagingCheckBox->setChecked(fWalletUnlockMessagingEnabled);
switch(mode)
{
case Encrypt: // Ask passphrase x2
ui->passLabel1->hide();
ui->passEdit1->hide();
ui->warningLabel->setText(tr("Enter the new passphrase to the wallet.<br/>Please use a passphrase of <b>10 or more random characters</b>, or <b>eight or more words</b>."));
setWindowTitle(tr("Encrypt wallet"));
break;
case UnlockStaking:
ui->stakingCheckBox->setChecked(true);
ui->stakingCheckBox->show();
// fallthru
case UnlockMessaging:
ui->messagingCheckBox->setChecked(true);
ui->messagingCheckBox->show();
case Unlock: // Ask passphrase
ui->warningLabel->setText(tr("This operation needs your wallet passphrase to unlock the wallet."));
ui->passLabel2->hide();
ui->passEdit2->hide();
ui->passLabel3->hide();
ui->passEdit3->hide();
setWindowTitle(tr("Unlock wallet"));
break;
case Decrypt: // Ask passphrase
ui->warningLabel->setText(tr("This operation needs your wallet passphrase to decrypt the wallet."));
ui->passLabel2->hide();
ui->passEdit2->hide();
ui->passLabel3->hide();
ui->passEdit3->hide();
setWindowTitle(tr("Decrypt wallet"));
break;
case ChangePass: // Ask old passphrase + new passphrase x2
setWindowTitle(tr("Change passphrase"));
ui->warningLabel->setText(tr("Enter the old and new passphrase to the wallet."));
break;
}
textChanged();
connect(ui->passEdit1, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
connect(ui->passEdit2, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
connect(ui->passEdit3, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
}
AskPassphraseDialog::~AskPassphraseDialog()
{
secureClearPassFields();
delete ui;
}
void AskPassphraseDialog::setModel(WalletModel *model)
{
this->model = model;
}
void AskPassphraseDialog::accept()
{
SecureString oldpass, newpass1, newpass2;
if(!model)
return;
oldpass.reserve(MAX_PASSPHRASE_SIZE);
newpass1.reserve(MAX_PASSPHRASE_SIZE);
newpass2.reserve(MAX_PASSPHRASE_SIZE);
// TODO: get rid of this .c_str() by implementing SecureString::operator=(std::string)
// Alternately, find a way to make this input mlock()'d to begin with.
oldpass.assign(ui->passEdit1->text().toStdString().c_str());
newpass1.assign(ui->passEdit2->text().toStdString().c_str());
newpass2.assign(ui->passEdit3->text().toStdString().c_str());
secureClearPassFields();
switch(mode)
{
case Encrypt: {
if(newpass1.empty() || newpass2.empty())
{
// Cannot encrypt with empty passphrase
break;
}
QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm wallet encryption"),
tr("Warning: If you encrypt your wallet and lose your passphrase, you will <b>LOSE ALL OF YOUR COINS</b>!") + "<br><br>" + tr("Are you sure you wish to encrypt your wallet?"),
QMessageBox::Yes|QMessageBox::Cancel,
QMessageBox::Cancel);
if(retval == QMessageBox::Yes)
{
if(newpass1 == newpass2)
{
if(model->setWalletEncrypted(true, newpass1))
{
QMessageBox::warning(this, tr("Wallet encrypted"),
"<qt>" +
tr("ShadowCoin will close now to finish the encryption process. "
"Remember that encrypting your wallet cannot fully protect "
"your coins from being stolen by malware infecting your computer.") +
"<br><br><b>" +
tr("IMPORTANT: Any previous backups you have made of your wallet file "
"should be replaced with the newly generated, encrypted wallet file. "
"For security reasons, previous backups of the unencrypted wallet file "
"will become useless as soon as you start using the new, encrypted wallet.") +
"</b></qt>");
QApplication::quit();
}
else
{
QMessageBox::critical(this, tr("Wallet encryption failed"),
tr("Wallet encryption failed due to an internal error. Your wallet was not encrypted."));
}
QDialog::accept(); // Success
}
else
{
QMessageBox::critical(this, tr("Wallet encryption failed"),
tr("The supplied passphrases do not match."));
}
}
else
{
QDialog::reject(); // Cancelled
}
} break;
case UnlockStaking:
case Unlock:
if(!model->setWalletLocked(false, oldpass))
{
QMessageBox::critical(this, tr("Wallet unlock failed"),
tr("The passphrase entered for the wallet decryption was incorrect."));
}
else
{
fWalletUnlockStakingOnly = ui->stakingCheckBox->isChecked();
fWalletUnlockMessagingEnabled = ui->messagingCheckBox->isChecked();
QDialog::accept(); // Success
}
break;
case Decrypt:
if(!model->setWalletEncrypted(false, oldpass))
{
QMessageBox::critical(this, tr("Wallet decryption failed"),
tr("The passphrase entered for the wallet decryption was incorrect."));
}
else
{
QDialog::accept(); // Success
}
break;
case ChangePass:
if(newpass1 == newpass2)
{
if(model->changePassphrase(oldpass, newpass1))
{
QMessageBox::information(this, tr("Wallet encrypted"),
tr("Wallet passphrase was successfully changed."));
QDialog::accept(); // Success
}
else
{
QMessageBox::critical(this, tr("Wallet encryption failed"),
tr("The passphrase entered for the wallet decryption was incorrect."));
}
}
else
{
QMessageBox::critical(this, tr("Wallet encryption failed"),
tr("The supplied passphrases do not match."));
}
break;
}
}
void AskPassphraseDialog::textChanged()
{
// Validate input, set Ok button to enabled when acceptable
bool acceptable = false;
switch(mode)
{
case Encrypt: // New passphrase x2
acceptable = !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
break;
case UnlockStaking:
case Unlock: // Old passphrase x1
case Decrypt:
acceptable = !ui->passEdit1->text().isEmpty();
break;
case ChangePass: // Old passphrase x1, new passphrase x2
acceptable = !ui->passEdit1->text().isEmpty() && !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
break;
}
ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(acceptable);
}
bool AskPassphraseDialog::event(QEvent *event)
{
// Detect Caps Lock key press.
if (event->type() == QEvent::KeyPress) {
QKeyEvent *ke = static_cast<QKeyEvent *>(event);
if (ke->key() == Qt::Key_CapsLock) {
fCapsLock = !fCapsLock;
}
if (fCapsLock) {
ui->capsLabel->setText(tr("Warning: The Caps Lock key is on!"));
} else {
ui->capsLabel->clear();
}
}
return QWidget::event(event);
}
bool AskPassphraseDialog::eventFilter(QObject *object, QEvent *event)
{
/* Detect Caps Lock.
* There is no good OS-independent way to check a key state in Qt, but we
* can detect Caps Lock by checking for the following condition:
* Shift key is down and the result is a lower case character, or
* Shift key is not down and the result is an upper case character.
*/
if (event->type() == QEvent::KeyPress) {
QKeyEvent *ke = static_cast<QKeyEvent *>(event);
QString str = ke->text();
if (str.length() != 0) {
const QChar *psz = str.unicode();
bool fShift = (ke->modifiers() & Qt::ShiftModifier) != 0;
if ((fShift && psz->isLower()) || (!fShift && psz->isUpper())) {
fCapsLock = true;
ui->capsLabel->setText(tr("Warning: The Caps Lock key is on!"));
} else if (psz->isLetter()) {
fCapsLock = false;
ui->capsLabel->clear();
}
}
}
return QDialog::eventFilter(object, event);
}
void AskPassphraseDialog::secureClearPassFields()
{
// Attempt to overwrite text so that they do not linger around in memory
ui->passEdit1->setText(QString(" ").repeated(ui->passEdit1->text().size()));
ui->passEdit2->setText(QString(" ").repeated(ui->passEdit2->text().size()));
ui->passEdit3->setText(QString(" ").repeated(ui->passEdit3->text().size()));
ui->passEdit1->clear();
ui->passEdit2->clear();
ui->passEdit3->clear();
}