src/qt/askpassphrasedialog.cpp

   1 #include "askpassphrasedialog.h"
   2 #include "ui_askpassphrasedialog.h"
   3
   4 #include "guiconstants.h"
   5 #include "walletmodel.h"
   6
   7 #include <QMessageBox>
   8 #include <QPushButton>
   9
  10 AskPassphraseDialog::AskPassphraseDialog(Mode mode, QWidget *parent) :
  11     QDialog(parent),
  12     ui(new Ui::AskPassphraseDialog),
  13     mode(mode),
  14     model(0)
  15 {
  16     ui->setupUi(this);
  17     ui->passEdit1->setMaxLength(MAX_PASSPHRASE_SIZE);
  18     ui->passEdit2->setMaxLength(MAX_PASSPHRASE_SIZE);
  19     ui->passEdit3->setMaxLength(MAX_PASSPHRASE_SIZE);
  20
  21     switch(mode)
  22     {
  23         case Encrypt: // Ask passphrase x2
  24             ui->passLabel1->hide();
  25             ui->passEdit1->hide();
  26             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>."));
  27             setWindowTitle(tr("Encrypt wallet"));
  28             break;
  29         case Unlock: // Ask passphrase
  30             ui->warningLabel->setText(tr("This operation needs your wallet passphrase to unlock the wallet."));
  31             ui->passLabel2->hide();
  32             ui->passEdit2->hide();
  33             ui->passLabel3->hide();
  34             ui->passEdit3->hide();
  35             setWindowTitle(tr("Unlock wallet"));
  36             break;
  37         case Decrypt:   // Ask passphrase
  38             ui->warningLabel->setText(tr("This operation needs your wallet passphrase to decrypt the wallet."));
  39             ui->passLabel2->hide();
  40             ui->passEdit2->hide();
  41             ui->passLabel3->hide();
  42             ui->passEdit3->hide();
  43             setWindowTitle(tr("Decrypt wallet"));
  44             break;
  45         case ChangePass: // Ask old passphrase + new passphrase x2
  46             setWindowTitle(tr("Change passphrase"));
  47             ui->warningLabel->setText(tr("Enter the old and new passphrase to the wallet."));
  48             break;
  49     }
  50
  51     textChanged();
  52     connect(ui->passEdit1, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
  53     connect(ui->passEdit2, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
  54     connect(ui->passEdit3, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
  55 }
  56
  57 AskPassphraseDialog::~AskPassphraseDialog()
  58 {
  59     // Attempt to overwrite text so that they do not linger around in memory
  60     ui->passEdit1->setText(QString(" ").repeated(ui->passEdit1->text().size()));
  61     ui->passEdit2->setText(QString(" ").repeated(ui->passEdit2->text().size()));
  62     ui->passEdit3->setText(QString(" ").repeated(ui->passEdit3->text().size()));
  63     delete ui;
  64 }
  65
  66 void AskPassphraseDialog::setModel(WalletModel *model)
  67 {
  68     this->model = model;
  69 }
  70
  71 void AskPassphraseDialog::accept()
  72 {
  73     std::string oldpass, newpass1, newpass2;
  74     if(!model)
  75         return;
  76     // TODO: mlock memory / munlock on return so they will not be swapped out, really need "mlockedstring" wrapper class to do this safely
  77     oldpass.reserve(MAX_PASSPHRASE_SIZE);
  78     newpass1.reserve(MAX_PASSPHRASE_SIZE);
  79     newpass2.reserve(MAX_PASSPHRASE_SIZE);
  80     oldpass.assign(ui->passEdit1->text().toStdString());
  81     newpass1.assign(ui->passEdit2->text().toStdString());
  82     newpass2.assign(ui->passEdit3->text().toStdString());
  83
  84     switch(mode)
  85     {
  86     case Encrypt: {
  87         if(newpass1.empty() || newpass2.empty())
  88         {
  89             // Cannot encrypt with empty passphrase
  90             break;
  91         }
  92         QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm wallet encryption"),
  93                  tr("WARNING: If you encrypt your wallet and lose your passphrase, you will <b>LOSE ALL OF YOUR BITCOINS</b>!\nAre you sure you wish to encrypt your wallet?"),
  94                  QMessageBox::Yes|QMessageBox::Cancel,
  95                  QMessageBox::Cancel);
  96         if(retval == QMessageBox::Yes)
  97         {
  98             if(newpass1 == newpass2)
  99             {
 100                 if(model->setWalletEncrypted(true, newpass1))
 101                 {
 102                     QMessageBox::warning(this, tr("Wallet encrypted"),
 103                                          tr("Bitcoin will close now to finish the encryption process. Remember that encrypting your wallet cannot fully protect your bitcoins from being stolen by malware infecting your computer."));
 104                     QApplication::quit();
 105                 }
 106                 else
 107                 {
 108                     QMessageBox::critical(this, tr("Wallet encryption failed"),
 109                                          tr("Wallet encryption failed due to an internal error. Your wallet was not encrypted."));
 110                 }
 111                 QDialog::accept(); // Success
 112             }
 113             else
 114             {
 115                 QMessageBox::critical(this, tr("Wallet encryption failed"),
 116                                      tr("The supplied passphrases do not match."));
 117             }
 118         }
 119         else
 120         {
 121             QDialog::reject(); // Cancelled
 122         }
 123         } break;
 124     case Unlock:
 125         if(!model->setWalletLocked(false, oldpass))
 126         {
 127             QMessageBox::critical(this, tr("Wallet unlock failed"),
 128                                   tr("The passphrase entered for the wallet decryption was incorrect."));
 129         }
 130         else
 131         {
 132             QDialog::accept(); // Success
 133         }
 134         break;
 135     case Decrypt:
 136         if(!model->setWalletEncrypted(false, oldpass))
 137         {
 138             QMessageBox::critical(this, tr("Wallet decryption failed"),
 139                                   tr("The passphrase entered for the wallet decryption was incorrect."));
 140         }
 141         else
 142         {
 143             QDialog::accept(); // Success
 144         }
 145         break;
 146     case ChangePass:
 147         if(newpass1 == newpass2)
 148         {
 149             if(model->changePassphrase(oldpass, newpass1))
 150             {
 151                 QMessageBox::information(this, tr("Wallet encrypted"),
 152                                      tr("Wallet passphrase was succesfully changed."));
 153                 QDialog::accept(); // Success
 154             }
 155             else
 156             {
 157                 QMessageBox::critical(this, tr("Wallet encryption failed"),
 158                                      tr("The passphrase entered for the wallet decryption was incorrect."));
 159             }
 160         }
 161         else
 162         {
 163             QMessageBox::critical(this, tr("Wallet encryption failed"),
 164                                  tr("The supplied passphrases do not match."));
 165         }
 166         break;
 167     }
 168 }
 169
 170 void AskPassphraseDialog::textChanged()
 171 {
 172     // Validate input, set Ok button to enabled when accepable
 173     bool acceptable = false;
 174     switch(mode)
 175     {
 176     case Encrypt: // New passphrase x2
 177         acceptable = !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
 178         break;
 179     case Unlock: // Old passphrase x1
 180     case Decrypt:
 181         acceptable = !ui->passEdit1->text().isEmpty();
 182         break;
 183     case ChangePass: // Old passphrase x1, new passphrase x2
 184         acceptable = !ui->passEdit1->text().isEmpty() && !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
 185         break;
 186     }
 187     ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(acceptable);
 188 }