Network Deployment (Distributed operating systems), v8.0 > Reference > Developer examples

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 your custom token    for (int i=0; i
<authzTokenList.size(); i++)
   {
    TokenHolder tokenHolder = (TokenHolder)authzTokenList.get(i);

          // Looks for the name and version of your custom AuthenticationToken
          // implementation     if (tokenHolder.getName().equals("your_oid_name") && tokenHolder.getVersion() == 1)
    {
            // Passes the bytes into your 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 your
          // AuthenticationToken implementation   {
        //  Gets the principal from the default AuthenticationToken. This principal
        //  should match all default tokens.
        //  Note: WAS runtime only enforces this for
//  default tokens. Thus, you 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");
   }
  }

     // Note: 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 your login module variables
 com.ibm.wsspi.security.token.AuthenticationToken customAuthToken = null;
 com.ibm.wsspi.security.token.AuthenticationToken defaultAuthToken = null;
 java.util.Map _sharedState = null;
}

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

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