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package org.netbeans.modules.keyring.fallback;
import java.security.SecureRandom;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.netbeans.modules.keyring.spi.EncryptionProvider;
import org.netbeans.spi.keyring.KeyringProvider;
/**
* Platform-independent keyring provider using a master password and the user directory.
*/
public class FallbackProvider implements KeyringProvider {
private static final Logger LOG = Logger.getLogger(FallbackProvider.class.getName());
private static final String DESCRIPTION = ".description";
private static final String SAMPLE_KEY = "__sample__";
private EncryptionProvider encryption;
private IPreferences prefs;
// simple interface for a generic preferences store
public interface IPreferences {
byte[] getByteArray(String key, byte[] def);
void putByteArray(String key, byte[] val);
void remove(String key);
}
public FallbackProvider(EncryptionProvider encryption, IPreferences prefs) {
this.encryption = encryption;
this.prefs = prefs;
}
@Override
public boolean enabled() {
if (encryption.enabled()) {
if (testSampleKey()) {
LOG.log(Level.FINE, "Using provider: {0}", encryption);
return true;
}
}
LOG.fine("No provider");
return false;
}
private boolean testSampleKey() {
encryption.freshKeyring(true);
byte[] randomArray = new byte[36];
new SecureRandom().nextBytes(randomArray);
if (_save(SAMPLE_KEY, (SAMPLE_KEY + new String(randomArray)).toCharArray(),
"Sample value ensuring that decryption is working.")) {
LOG.fine("saved sample key");
return true;
} else {
LOG.fine("could not save sample key");
return false;
}
}
public char[] read(String key) {
byte[] ciphertext = prefs.getByteArray(key, null);
if (ciphertext == null) {
return null;
}
try {
return encryption.decrypt(ciphertext);
} catch (Exception x) {
LOG.log(Level.FINE, "failed to decrypt password for " + key, x);
}
return null;
}
public void save(String key, char[] password, String description) {
_save(key, password, description);
}
private boolean _save(String key, char[] password, String description) {
try {
prefs.putByteArray(key, encryption.encrypt(password));
} catch (Exception x) {
LOG.log(Level.FINE, "failed to encrypt password for " + key, x);
return false;
}
return true;
}
public void delete(String key) {
prefs.remove(key);
prefs.remove(key + DESCRIPTION);
}
}