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package oracle.toplink.essentials.internal.security;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.internal.helper.ConversionManager;
import oracle.toplink.essentials.internal.security.PrivilegedAccessHelper;
/**
* Holder of a SecurableObject. Securable objects should not be held onto
* directly, instead they should be accessed via this holder.
*
* @author Guy Pelletier
* @date June 26, 2003
*/
public class SecurableObjectHolder {
/** The JCE encryption class name */
private final static String JCE_ENCRYPTION_CLASS_NAME = "oracle.toplink.essentials.internal.security.JCEEncryptor";
/** The encryption class name **/
private String m_securableClassName;
/** The actual encryption object **/
private Securable m_securableObject;
public SecurableObjectHolder() {
this(null);
}
public SecurableObjectHolder(String securableClassName) {
m_securableObject = null;
m_securableClassName = securableClassName;
}
public void setEncryptionClassName(String securableClassName) {
m_securableClassName = securableClassName;
}
public Securable getSecurableObject() {
if (m_securableObject == null) {
initSecurableObject();
}
return m_securableObject;
}
public boolean hasSecurableObject() {
return m_securableObject != null;
}
/**
* Convert a String into a Securable object
* Class name must be fully qualified, eg. oracle.toplink.essentials.internal.security.JCEEncryptor
* Default is the JCEEncryptor
*/
private void initSecurableObject() {
boolean initPassThroughEncryptor = false;
if (m_securableClassName == null) {
// Since we are defaulting, hence, assuming they can initialize the JCE
// libraries, if the init fails, this flag tells us to assume no encryption.
// However, if the JCE init does work, the JCEEncryptor will need to
// determine that a password was not encrypted by it, therefore, assume
// clear text. See JCEEncryptor.
initPassThroughEncryptor = true;
m_securableClassName = JCE_ENCRYPTION_CLASS_NAME;
}
try {
ConversionManager cm = ConversionManager.getDefaultManager();
Class securableClass = (Class)cm.convertObject(m_securableClassName, Class.class);
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
m_securableObject = (Securable)AccessController.doPrivileged(new PrivilegedNewInstanceFromClass(securableClass));
} catch (PrivilegedActionException exception) {
throw exception.getException();
}
} else {
m_securableObject = (Securable)PrivilegedAccessHelper.newInstanceFromClass(securableClass);
}
} catch (Throwable e) {
if (initPassThroughEncryptor) {// default failed, so perform no encryption.
m_securableObject = new PassThroughEncryptor();
} else {
throw ValidationException.invalidEncryptionClass(m_securableClassName, e);
}
}
}
/*
* If we default to JCE and the initialization fails, our fall back is to do
* no encryption. This covers the case where the user is running against JDK 1.3
* At runtime, no encryption will be made and the passwords will be assummed to
* be clear text.
*/
private class PassThroughEncryptor implements Securable {
public String encryptPassword(String pswd) {
return pswd;
}
public String decryptPassword(String encryptedPswd) {
return encryptedPswd;
}
}
}