Example: A custom authentication token login module


This examples shows how to determine if the login is an initial login or a propagation login.

For information on what to do during initialization, login and commit, see Develop custom login modules for a system login configuration for JAAS.

public customLoginModule() 
{
  public void initialize(Subject subject, CallbackHandler callbackHandler, 
    Map sharedState, Map options) 
  {
    _sharedState = sharedState;
  }

  public boolean login() throws LoginException 
  {
    
// Handles the WSTokenHolderCallback to see if this is an initial or 
     
// propagation login.
    Callback callbacks[] = new Callback[1];
    callbacks[0] = new WSTokenHolderCallback("Authz Token List: ");
          
    try
    {
      callbackHandler.handle(callbacks);
    } 
    catch (Exception e)
    {
      
// Handles exception
    } 
            
    
// Receives the ArrayList of TokenHolder objects (the serialized tokens)
    List authzTokenList = ((WSTokenHolderCallback) callbacks[0]).getTokenHolderList();
        
    if (authzTokenList != null)
    {
      
// Iterates through the list looking for the custom token
      for (int i=0; i<authzTokenList.size(); i++)
      {
        TokenHolder tokenHolder = (TokenHolder)authzTokenList.get(i);

          
// Looks for the name and version of the custom AuthenticationToken
          
// implementation
        if (tokenHolder.getName().equals("my_oid_name") && tokenHolder.getVersion() == 1)
        {
            
// Passes the bytes into the custom AuthenticationToken constructor
            
// to deserialize
          customAuthzToken = new                   
            com.ibm.websphere.security.token.
               CustomAuthenticationTokenImpl(tokenHolder.getBytes());

        }
      }
    }
    else 
          
// This is not a propagation login. Create a new instance of the 
          
// AuthenticationToken implementation
    {
        
//  Gets the principal from the default AuthenticationToken. This principal
        
//  should match all default tokens.
        
//  

WAS runtime only enforces this for // default tokens. Thus, we can choose // to do this for custom tokens, but it is not required. defaultAuthToken = (com.ibm.wsspi.security.token.AuthenticationToken) sharedState.get(com.ibm.wsspi.security.auth.callback.Constants.WSAUTHTOKEN_KEY); String principal = defaultAuthToken.getPrincipal(); // Adds a new custom authentication token. This is an initial login. Pass // the principal into the constructor customAuthToken = new com.ibm.websphere.security.token. CustomAuthenticationTokenImpl(principal); // Adds any initial attributes if (customAuthToken != null) { customAuthToken.addAttribute("key1", "value1"); customAuthToken.addAttribute("key1", "value2"); customAuthToken.addAttribute("key2", "value1"); customAuthToken.addAttribute("key3", "something different"); } } //

We can add the token to the Subject during commit in case // something happens during the login. } public boolean commit() throws LoginException { if (customAuthToken != null) { // Sets the customAuthToken token into the Subject try { private final AuthenticationToken customAuthTokenPriv = customAuthToken; // Do this in a doPrivileged code block so that application code does // not need to add additional permissions java.security.AccessController.doPrivileged(new java.security.PrivilegedAction() { public Object run() { try { // Adds the custom Authentication token if it is not // null and not already in the Subject if ((customAuthTokenPriv != null) && (!subject.getPrivateCredentials(). contains(customAuthTokenPriv))) { subject.getPrivateCredentials().add(customAuthTokenPriv); } } catch (Exception e) { throw new WSLoginFailedException (e.getMessage(), e); } return null; } }); } catch (Exception e) { throw new WSLoginFailedException (e.getMessage(), e); } } } // Defines the login module variables com.ibm.wsspi.security.token.AuthenticationToken customAuthToken = null; com.ibm.wsspi.security.token.AuthenticationToken defaultAuthToken = null; java.util.Map _sharedState = null; }





 

Related tasks


Develop custom login modules for a system login configuration for JAAS
Implement a custom authentication token for security attribute propagation