www.developer.com/security/article.php/3587361
By Svetlin Nakov February 24, 2006 Listing 2: PKCS11LibraryFileAndPINCodeDialog.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.FileFilter;
import java.io.*;
import java.util.Properties;
/**
* Dialog for choosing PKCS#11 implementation library file and
* PIN code for accessing the smart card. Allows the user to
* choose a PKCS#11 library file (.dll / .so) and enter a PIN code
* for the smart card. The last used library file name is remembered
* in the config file called ".smart_card_signer_applet.config"
* located in the user's home directory in order to be
* automatically shown the next time when the same user accesses
* this dialog.
*
* This file is part of NakovDocumentSigner digital document
* signing framework for Java-based Web applications:
* http://www.nakov.com/documents-signing/
*
* Copyright (c) 2005 by Svetlin Nakov - http://www.nakov.com
* All rights reserved. This code is freeware. It can be used
* for any purpose as long as this copyright statement is not
* removed or modified.
*/
public class PKCS11LibraryFileAndPINCodeDialog extends JDialog {
private static final String CONFIG_FILE_NAME =
".smart_card_signer_applet.config";
private static final String PKCS11_LIBRARY_FILE_NAME_KEY =
"last-PKCS11-file-name";
private JButton mBrowseForLibraryFileButton = new JButton();
private JTextField mLibraryFileNameTextField = new JTextField();
private JLabel mChooseLibraryFileLabel = new JLabel();
private JTextField mPINCodeTextField = new JPasswordField();
private JLabel mEnterPINCodeLabel = new JLabel();
private JButton mSignButton = new JButton();
private JButton mCancelButton = new JButton();
private boolean mResult = false;
/**
* Initializes the dialog - creates and initializes its GUI
* controls.
*/
public PKCS11LibraryFileAndPINCodeDialog() {
// Initialize the dialog
this.getContentPane().setLayout(null);
this.setSize(new Dimension(426, 165));
this.setBackground(SystemColor.control);
this.setTitle("Select PKCS#11 library file and smart " +
"card PIN code");
this.setResizable(false);
// Center the dialog in the screen
Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
Dimension dialogSize = this.getSize();
int centerPosX =
(screenSize.width - dialogSize.width) / 2;
int centerPosY =
(screenSize.height - dialogSize.height) / 2;
setLocation(centerPosX, centerPosY);
// Initialize certificate keystore file label
mChooseLibraryFileLabel.setText(
"Please select your PKCS#11 implementation library file
(.dll / .so) :");
mChooseLibraryFileLabel.setBounds(new Rectangle(10, 5, 400, 15));
mChooseLibraryFileLabel.setFont(new Font("Dialog", 0, 12));
// Initialize certificate keystore file name text field
mLibraryFileNameTextField.setBounds(
new Rectangle(10, 25, 315, 20));
mLibraryFileNameTextField.setFont(
new Font("DialogInput", 0, 12));
mLibraryFileNameTextField.setEditable(false);
mLibraryFileNameTextField.setBackground(SystemColor.control);
// Initialize browse button
mBrowseForLibraryFileButton.setText("Browse");
mBrowseForLibraryFileButton.setBounds(
new Rectangle(330, 25, 80, 20));
mBrowseForLibraryFileButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
browseForLibraryButton_actionPerformed();
}
});
// Initialize PIN code label
mEnterPINCodeLabel.setText("Enter the PIN code to access " +
"your smart card:");
mEnterPINCodeLabel.setBounds(new Rectangle(10, 55, 350, 15));
mEnterPINCodeLabel.setFont(new Font("Dialog", 0, 12));
// Initialize PIN code text field
mPINCodeTextField.setBounds(new Rectangle(10, 75, 400, 20));
mPINCodeTextField.setFont(new Font("DialogInput", 0, 12));
// Initialize sign button
mSignButton.setText("Sign");
mSignButton.setBounds(new Rectangle(110, 105, 75, 25))
mSignButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
signButton_actionPerformed();
}
});
// Initialize cancel button
mCancelButton.setText("Cancel");
mCancelButton.setBounds(new Rectangle(220, 105, 75, 25));
mCancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cancelButton_actionPerformed();
}
});
// Add the initialized components into the dialog's content pane
this.getContentPane().add(mChooseLibraryFileLabel, null);
this.getContentPane().add(mLibraryFileNameTextField, null);
this.getContentPane().add(mBrowseForLibraryFileButton, null);
this.getContentPane().add(mEnterPINCodeLabel, null);
this.getContentPane().add(mPINCodeTextField, null);
this.getContentPane().add(mSignButton, null);
this.getContentPane().add(mCancelButton, null);
this.getRootPane().setDefaultButton(mSignButton);
// Add some functionality for focusing the most appropriate
// control when the dialog is shown
this.addWindowListener(new WindowAdapter() {
public void windowOpened(WindowEvent windowEvent) {
String libraryFileName =
mLibraryFileNameTextField.getText();
if (libraryFileName != null && libraryFileName.length() != 0)
mPINCodeTextField.requestFocus();
else
mBrowseForLibraryFileButton.requestFocus();
}
});
}
/**
* Called when the "Browse" button is pressed.
* Shows file choose dialog and allows the user to locate a
* library file.
*/
private void browseForLibraryButton_actionPerformed() {
JFileChooser fileChooser = new JFileChooser();
LibraryFileFilter libraryFileFilter = new LibraryFileFilter();
fileChooser.addChoosableFileFilter(libraryFileFilter);
String libraryFileName = mLibraryFileNameTextField.getText();
File directory = new File(libraryFileName).getParentFile();
fileChooser.setCurrentDirectory(directory);
if (fileChooser.showOpenDialog(this)
== JFileChooser.APPROVE_OPTION) {
String selectedLibFile =
fileChooser.getSelectedFile().getAbsolutePath();
mLibraryFileNameTextField.setText(selectedLibFile);
}
}
/**
* Called when the sign button is pressed. Closses the dialog
* and sets the result flag to true to indicate that the user
* is confirmed the information entered in the dialog.
*/
private void signButton_actionPerformed() {
mResult = true;
this.setVisible(false);
}
/**
* Called when the cancel button is pressed. Closes the dialog
* and sets the result flag to false that indicates that the
* dialog is canceled.
*/
private void cancelButton_actionPerformed() {
mResult = false;
this.setVisible(false);
}
/**
* @return the file name with full path to it where the dialog
* settings are stored.
*/
private String getConfigFileName() {
String configFileName = System.getProperty("user.home") +
System.getProperty("file.separator") + CONFIG_FILE_NAME;
return configFileName;
}
/**
* Loads the dialog settings from the dialog configuration file.
* These settings consist of a single value - the last used
* library file name with its full path.
*/
private void loadSettings()
throws IOException {
String configFileName = getConfigFileName();
FileInputStream configFileStream =
new FileInputStream(configFileName);
try {
Properties configProps = new Properties();
configProps.load(configFileStream);
// Apply setings from the config file
String lastLibraryFileName =
configProps.getProperty(PKCS11_LIBRARY_FILE_NAME_KEY);
if (lastLibraryFileName != null)
mLibraryFileNameTextField.setText(lastLibraryFileName);
else
mLibraryFileNameTextField.setText("");
} finally {
configFileStream.close();
}
}
/**
* Saves the dialog settings to the dialog configuration file.
* These settings consist of a single value - the last used
* library file name with its full path.
*/
private void saveSettings()
throws IOException {
// Create a list of settings to store in the config file
Properties configProps = new Properties();
String currentLibraryFileName =
mLibraryFileNameTextField.getText();
configProps.setProperty(PKCS11_LIBRARY_FILE_NAME_KEY,
currentLibraryFileName);
// Save the settings in the config file
String configFileName = getConfigFileName();
FileOutputStream configFileStream =
new FileOutputStream(configFileName);
try {
configProps.store(configFileStream, "");
} finally {
configFileStream.close();
}
}
/**
* @return the library file selected by the user.
*/
public String getLibraryFileName() {
String libraryFileName = mLibraryFileNameTextField.getText();
return libraryFileName;
}
/**
* @return the PIN code entered by the user.
*/
public String getSmartCardPINCode() {
String pinCode = mPINCodeTextField.getText();
return pinCode;
}
/**
* Shows the dialog and allow the user to choose library file
* and enter a PIN code.
* @return true if the user click sign button or false if the
* user cancels the dialog.
*/
public boolean run() {
try {
loadSettings();
} catch (IOException ioex) {
// Loading settings failed. Default settings will be used.
}
setModal(true);
this.setVisible(true);
try {
if (mResult) {
saveSettings();
}
} catch (IOException ioex) {
// Saving settings failed. Cannot handle this problem.
}
return mResult;
}
/**
* File filter class, intended to accept only .dll and .so files.
*/
private static class LibraryFileFilter extends FileFilter {
public boolean accept(File aFile) {
if (aFile.isDirectory()) {
return true;
}
String fileName = aFile.getName().toLowerCase();
boolean accepted =
(fileName.endsWith(".dll") || fileName.endsWith(".so"));
return accepted;
}
public String getDescription() {
return "PKCS#11 v2.0 ot later implementation library " +
"(.dll, .so)";
}
}
}
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