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Java SE security tutorial - Step 2


Accept on the previous step, the following topic shows how to implement client authentication in a distributed eXtreme Scale environment.


Before you begin

Be sure that you have completed Java SE security tutorial - Step 1.

With client authentication enabled, a client is authenticated before connecting to the eXtreme Scale server. This section demonstrates how client authentication can be done in an eXtreme Scale server environment, including sample code and scripts to demonstrate.

As any other authentication mechanism, the minimum authentication consists of the following steps:

  1. The administrator changes configurations to make authentication a requirement.

  2. The client provides a credential to the server.

  3. The server authenticates the credential to the registry.


Procedure

  1. Client credential

    A client credential is represented by a com.ibm.websphere.objectgrid.security.plugins.Credential interface. A client credential can be a user name and password pair, a Kerberos ticket, a client certificate, or data in any format that the client and server agree upon. Refer to Credential API documentation for more details.

    This interface explicitly defines the equals(Object) and hashCode() methods. These two methods are important because the authenticated Subject objects are cached by using the Credential object as the key on the server side.

    eXtreme Scale also provides a plug-in to generate a credential. This plug-in is represented by the com.ibm.websphere.objectgrid.security.plugins.CredentialGenerator interface, and is used to generate a client credential. This is useful when the credential is expirable. In this case, the getCredential() method is called to renew a credential. Refer to CredentialGenerator API Documentation for more details.

    You can implement these two interfaces for eXtreme Scale client runtime to obtain client credentials.

    This sample uses the following two sample plug-in implementations provided by eXtreme Scale. 

    com.ibm.websphere.objectgrid.security.plugins.builtins.UserPasswordCredential


    com.ibm.websphere.objectgrid.security.plugins.builtins.UserPasswordCredentialGenerator

    For more information about these plug-ins, see Client authentication programming

  2. Server authenticator
    After the eXtreme Scale client retrieves the Credential object using the CredentialGenerator object, this client Credential object is sent along with the client request to the eXtreme Scale server. The eXtreme Scale server authenticates the Credential object before processing the request. If the Credential object is authenticated successfully, a Subject object is returned to represent this client.

    This Subject object is then cached, and it expires after its lifetime reaches the session timeout value. The login session timeout value can be set by using the loginSessionExpirationTime property in the cluster XML file. For example, setting loginSessionExpirationTime="300" makes the Subject object expire in 300 seconds. This Subject object is then used for authorizing the request, which is shown later.

    An eXtreme Scale server uses the Authenticator plug-in to authenticate the Credential object. Refer to Authenticator API Documentation for more details.

    This example uses an eXtreme Scale built-in implementation: KeyStoreLoginAuthenticator, which is for testing and sample purposes (a key store is a simple user registry and should not be used for production). For more information, see the topic on authenticator plug-in under Client authentication programming.

    This KeyStoreLoginAuthenticator uses a KeyStoreLoginModule to authenticate the user with the key store by using the JAAS login module "KeyStoreLogin". The key store can be configured as an option to the KeyStoreLoginModule class. The following example illustrates the keyStoreLogin alias configured in the JAAS configuration file og_jaas.config: 

    KeyStoreLogin{
com.ibm.websphere.objectgrid.security.plugins.builtins.KeyStoreLoginModule required
     keyStoreFile="../security/sampleKS.jks" debug = true;
};

    The following commands create a key store sampleKS.jks in the %OBJECTGRID_HOME%/security directory with the password as sampleKS1. Also, three user certificates representing the administrator user, the manager user, and the cashier user are created with their own passwords.

    1. Navigate to the eXtreme Scale root directory. 

      cd objectgridRoot

    2. Create a directory called "security". 

      mkdir security

    3. Navigate to the newly created security directory. 

      cd security

    4. Use keytool (in the javaHOME/bin directory) to create a user "administator" with password "administrator1" in the key store sampleKS.jks. 

      keytool -genkey -v -keystore ./sampleKS.jks -storepass sampleKS1 
-alias administrator -keypass administrator1 
-dname CN=administrator,O=acme,OU=OGSample -validity 10000

    5. Use keytool (in the javaHOME/bin directory) to create a user "manager" with password "manager1" in the key store sampleKS.jks. 

      keytool -genkey -v -keystore ./sampleKS.jks -storepass sampleKS1 
-alias manager -keypass manager1 
-dname CN=manager,O=acme,OU=OGSample -validity 10000

    6. Use keytool (in the javaHOME/bin directory) to create a user "cashier" with password "cashier1" in the key store sampleKS.jks. 

      keytool -genkey -v -keystore ./sampleKS.jks -storepass sampleKS1 
-alias cashier -keypass cashier1 -dname CN=cashier,O=acme,OU=OGSample 
-validity 10000

    The client security configuration is configured in the client properties file. Use the following command to create a copy in the %OBJECTGRID_HOME%/security directory:

    1. Change to the security directory. 

      cd objectgridRoot/security

    2. Copy the sampleClient.properties file to the client.properties file. 

      cp ../properties/sampleClient.properties client.properties

    The following properties are highlighted in the client.properties file in the security directory.

    1. securityEnabled: Setting securityEnabled to true (default value) enables the client security, which includes authentication.

    2. credentialAuthentication: Set credentialAuthentication to Supported (default value), which means the client supports credential authentication.

    3. transportType: Set transportType to TCP/IP, which means no SSL will be used.

    4. singleSignOnEnabled: Set it to false (default value). Single sign-on is not available.

  3. Server security configuration

    The server security configuration is specified in the security descriptor XML file and the server security property file. The security descriptor XML file describes the security properties common to all servers (including catalog servers and container servers). One property example is the authenticator configuration which represents the user registry and authentication mechanism.

    Here is the security.xml file to be used in this sample: 

    <?xml version="1.0" encoding="UTF-8"?>
<securityConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://ibm.com/ws/objectgrid/config/security ../objectGridSecurity.xsd"
    xmlns="http://ibm.com/ws/objectgrid/config/security">
    <security securityEnabled="true" loginSessionExpirationTime="300" >        
       
<authenticator className ="com.ibm.websphere.objectgrid.security.plugins.builtins.
                    KeyStoreLoginAuthenticator">
       
</authenticator>
   
</security>
    </securityConfig>

    1. securityEnabled: Set to true, which enables the server security including authentication.

    2. loginSessionExpirationTime: Set the value to 300 (default value).

    3. authenticator: Add the authenticator class KeyStoreLoginAuthenticator to the cluster XML file as follows: 

      <authenticator className ="com.ibm.websphere.objectgrid.security.plugins.builtins.
        KeyStoreLoginAuthenticator">
</authenticator>

    4. credentialAuthentication: Set credentialAuthentication attribute to Required so the server requires authentication

    For more detailed explanation on the security.xml file, see Security descriptor XML file.

    Copy the server properties file into the security directory. At this time, you do not need to modify anything in this file.

    1. Navigate to the security directory. 

      cd objectgridRoot/security

    2. Copy the sample objectGrid sampleServer.properties file from the properties directory to the new server.properties file. 

      cp ../properties/containerServer.properties server.properties

    Make the following changes in the server.properties file:

    1. securityEnabled: Set the securityEnabled attribute to true.

    2. transportType: Set transportType attribute to TCP/IP, which means no SSL is used.

    3. secureTokenManagerType: Set secureTokenManagerType attribute to none to not configure the secure token manager.

  4. Secure client
    Connect the client application to the server securely as demonstrated in the following example: 

    // This sample program is provided AS IS and may be used, executed, copied and modified 
// without royalty payment by customer 
// (a) for its own instruction and study, 
// (b) in order to develop applications designed to run with an IBM WebSphere product, 
// either for customer's own internal use or for redistribution by customer, as part of such an 
// application, in customer's own products.
// Licensed Materials - Property of IBM
// 5724-J34 (C) COPYRIGHT International Business Machines Corp. 2007-2009
package com.ibm.websphere.objectgrid.security.sample.guide;

import com.ibm.websphere.objectgrid.ClientClusterContext;
import com.ibm.websphere.objectgrid.ObjectGrid;
import com.ibm.websphere.objectgrid.ObjectGridManager;
import com.ibm.websphere.objectgrid.ObjectGridManagerFactory;
import com.ibm.websphere.objectgrid.security.config.ClientSecurityConfiguration;
import com.ibm.websphere.objectgrid.security.config.ClientSecurityConfigurationFactory;
import com.ibm.websphere.objectgrid.security.plugins.CredentialGenerator;
import com.ibm.websphere.objectgrid.security.plugins.builtins.UserPasswordCredentialGenerator;

public class SecureSimpleApp extends SimpleApp {

    public static void main(String[] args) throws Exception {

        SecureSimpleApp app = new SecureSimpleApp();
        app.run(args);
    }

    /**
     * Get the ObjectGrid
     * @return an ObjectGrid instance
     * @throws Exception
     */
    protected ObjectGrid getObjectGrid(String[] args) throws Exception {
        ObjectGridManager ogManager = ObjectGridManagerFactory.getObjectGridManager();
        ogManager.setTraceFileName("logs/client.log");
        ogManager.setTraceSpecification("ObjectGrid*=all=enabled:ORBRas=all=enabled");

        // Creates a ClientSecurityConfiguration object using the specified file
        ClientSecurityConfiguration clientSC = ClientSecurityConfigurationFactory
                .getClientSecurityConfiguration(args[0]);
        
        // Creates a CredentialGenerator using the passed-in user and password.
        CredentialGenerator credGen = new UserPasswordCredentialGenerator(args[1], args[2]);
        clientSC.setCredentialGenerator(credGen);
        
        // Create an ObjectGrid by connecting to the catalog server 
        ClientClusterContext ccContext = ogManager.connect("localhost:2809", clientSC, null);
        ObjectGrid og = ogManager.getObjectGrid(ccContext, "accounting");

        return og;

    }

}

    There are three things different from the non-secured application:

    1. Created a ClientSecurityConfiguration object by passing the configured client.properties file.

    2. Created a UserPasswordCredentialGenerator by using the passed-in user ID and password.

    3. Connected to the catalog server to obtain an ObjectGrid from the ClientClusterContext by passing a ClientSecurityConfiguration object.

  5. Issue the application

    To run the application, start the catalog server. Issue the -clusterFile and -serverProps command line options to pass in the security properties:

    1. Navigate to the bin directory: 

      cd objectgridRoot/bin

    2. Launch the catalog server: 

      • startOgServer.sh catalogServer -clusterSecurityFile ../security/security.xml 
-serverProps ../security/server.properties -jvmArgs 
-Djava.security.auth.login.config="../security/og_jaas.config"

      • [Windows] 

        startOgServer.bat catalogServer -clusterSecurityFile ../security/security.xml 
-serverProps ../security/server.properties -jvmArgs 
-Djava.security.auth.login.config="../security/og_jaas.config"

    Then, launch a secure container server by using the following script:

    1. Navigate to the bin directory again: 

      cd objectgridRoot/bin

    2. Launch a secure container server:

      • [Linux][Unix] 

        startOgServer.sh c0 -objectgridFile ../xml/SimpleApp.xml 
-deploymentPolicyFile ../xml/SimpleDP.xml 
-catalogServiceEndpoints localhost:2809 
-serverProps ../security/server.properties 
-jvmArgs -Djava.security.auth.login.config="../security/og_jaas.config"

      • [Windows] 

        startOgServer.bat c0 -objectgridFile ../xml/SimpleApp.xml 
-deploymentPolicyFile ../xml/SimpleDP.xml 
-catalogServiceEndpoints localhost:2809 
-serverProps ../security/server.properties 
-jvmArgs -Djava.security.auth.login.config="../security/og_jaas.config"

    The server property file is passed by issuing -serverProps.

    After the server is started, launch the client by using the following command: 

    1. cd objectgridRoot/bin


    2. java -classpath ../lib/objectgrid.jar;../applib/secsample.jar
        com.ibm.websphere.objectgrid.security.sample.guide.SecureSimpleApp
        ../security/client.properties manager manager1

    The secsample.jar file contains the SimpleApp class.

    The SecureSimpleApp uses three parameters that are provided in the following list:

    1. The ../security/client.properties file is the client security property file.

    2. manager is the user ID.

    3. manager1 is the password.

    After you issue the class, the following output results:

    The customer name for ID 0001 is fName lName.

    You may also use xsadmin to show the mapsizes of the "accounting" grid.

    • Navigate to the directory objectgridRoot/bin.

    • Use the xsadmin command with option -mapSizes as follows.

      • xsadmin.sh -g accounting -m mapSet1 -username manager -password manager1 -mapSizes

      • [Windows] xsadmin.bat -g accounting -m mapSet1 -username manager -password manager1 -mapSizes

      You see the following output.

      This administrative utility is provided as a sample only and is not to be considered a fully supported component of the WebSphere eXtreme Scale product.

      Connect to Catalog service at localhost:1099

      *********** Displaying Results for Grid - accounting, MapSet - mapSet1 ***********

      *** Listing Maps for c0 ***

      Map Name: customer Partition #: 0 Map Size: 1 Shard Type: Primary

      Server Total: 1

      Total Domain Count: 1

    Now you can use stopOgServer command to stop the container server or catalog service process. However you need to provide a security configuration file. The sample client property file defines the following two properties to generate a userID/password credential (manager/manager1). 

    credentialGeneratorClass=com.ibm.websphere.objectgrid.security.plugins.builtins.UserPasswordCredentialGenerator 


    credentialGeneratorProps=manager manager1

    Stop the container c0 with the following command.

    • stopOgServer.sh c0 -catalogServiceEndPoints localhost:2809 -clientSecurityFile ..\security\client.properties

    • [Windows] stopOgServer.bat c0 -catalogServiceEndPoints localhost:2809 -clientSecurityFile ..\security\client.properties

    If you do not provide the -clientSecurityFile option, we will see an exception with the following message.

    >> SERVER (id=39132c79, host=9.10.86.47) TRACE START:

    >> org.omg.CORBA.NO_PERMISSION: Server requires credential authentication but there is no security context from the client. This usually happens when the client does not pass a credential the server.

    vmcid: 0x0

    minor code: 0

    completed: No

    You can also shut down the catalog server using the following command. However, if to continue trying the next step tutorial, you can let the catalog server stay running.

    • stopOgServer.sh catalogServer -catalogServiceEndPoints localhost:2809 -clientSecurityFile ..\security\client.properties

    • [Windows] stopOgServer.bat catalogServer -catalogServiceEndPoints localhost:2809 -clientSecurityFile ..\security\client.properties

    If you do shutdown the catalog server, we will see the following output.

    CWOBJ2512I: ObjectGrid server catalogServer stopped

    Now, you have successfully made the system partially secure by enabling authentication. You configured the server to plug in the user registry, configured the client to provide client credentials, and changed the client property file and cluster XML file to enable authentication.

    If you provide an invalidate password, you see an exception stating that the user name or password is not correct.

    For more details about client authentication, see Application client authentication.

    Next step of tutorial



Parent topic

Java SE security tutorial - Main page


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