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IBM’s WebSphere Application Server for eserver iSeries 400 (formerly named WebSphere Application Server for AS/400) is an e-business application deployment environment built on open standards and is available in two editions. The Standard Edition lets you use Java servlets, JavaServer Page (JSP), and XML to quickly add dynamic content to your Web sites. The Advanced Edition offers all of the functionality of the Standard Edition and additionally supports Enterprise JavaBean (EJB) components.

With WebSphere Application Server, you can secure your applications by configuring three security policies: authentication for determining who is making a request, authorization for determining whether the request is to be honored, and delegation for determining who will be handling the request. Security requirements vary by application. WebSphere allows you to tailor your security policies to match the requirements of individual e-business applications. WebSphere authentication and authorization policies apply to both Enterprise JavaBean and Web resources (including HTML files, JSPs, and servlets), and the same tasks configure security for Web resources and EJBs to provide a unified security model. Resources comprising e-business applications are often distributed across multiple application servers, and those servers may be hosted on different systems.

For such topologies, the WebSphere Application Server provides a distributed security model.

In this article, I’ll provide an overview of WebSphere Application Server security. I’ll also provide instructions for configuring security for a simple application and for a few other tasks related to maintenance and administration.

The instructions for configuring security assume a simple topology consisting of one application server and one Web server, both hosted on the same system, and demonstrate how to configure basic security for a Web client. The WebSphere Application Server supports two client types, a Web client and a Java (EJB) client or applet. Implementing security for a Java client is beyond the scope of this article, though, so this won’t be discussed.

The information presented here is specific to WebSphere Application Server Version 3.5. Though much of this information is also applicable to Version 3.0, I will not attempt to deal with all differences between the two releases; I’ll only note some of the major differences.


Getting Secure

Web clients communicate with a Web server using the HTTP protocol. The WebSphere Application Server provides security services to the Web server via a security plug-in. This plug-in serves as an interface to the security application that resides within the administrative server and helps make security decisions when users request HTML files from the Web server. Security services are provided to the application server via a security collaborator, which serves as an interface to the security application. The collaborator makes security decisions on method calls on EJBs, JSPs, and servlets hosted by the application server. Figure 1 demonstrates the interaction between a security application and the security runtime in the application server and the Web server.

Security policies are configured using the WebSphere administrative console, which is a Java client to the administrative and security applications within the WebSphere administrative server.

An authentication policy determines how authentication is accomplished. Authentication is performed in two steps: first, acquiring the authentication data of a principal; second, validating the authentication data against a user registry.

To understand an authentication policy, you first should be familiar with its components. An authentication mechanism validates authentication data against an associated user registry. The WebSphere Application Server offers two choices for authentication mechanisms: Lightweight Third Party Authentication (LTPA) and native OS. LTPA uses a trusted third-party server to authenticate a user. LTPA is the heart of the distributed security model. Since all application servers trust the third-party authentication server, security information can be passed along with requests from one application server to another. Use the LTPA authentication mechanism when applications are distributed across multiple application servers and the application servers are hosted on different systems. The native OS authentication mechanism uses native OS/400 routines (OS/400 user profiles) to authenticate a user. A native OS is easier to configure than LTPA but can be used only when all application servers are hosted by the same system. Note that authenticating through the native OS mechanism does not log a user onto OS/400. Even though user profiles and passwords are used for authentication, no jobs or threads are executed under users’ profiles.

A challenge type specifies how a server will challenge and retrieve authentication data from a user. The choices for challenge type are none, basic, custom, and certificate. With a challenge type of none, a user is not challenged for authentication data. If the requested resource is protected, then the user will not be served the resource. With the basic challenge type, the user is challenged for a user ID and password. The custom challenge type is applicable only to Web clients and is used when one wants to configure the server to use a customized HTML form to retrieve a user ID and password. The certificate challenge is also applicable only to Web clients. In this case, the user is required to present a digital certificate (X.509) to establish a connection. With the certificate challenge type, the Web server is trusted to authenticate a user through the Secure Sockets Layer (SSL) exchange. Then, for authorization purposes, the WebSphere security infrastructure identifies the principal by extracting information from the certificate and mapping it to an entry in the user registry.

A user registry is where user and group information is stored. It contains a mapping of principals to authentication information and privilege attributes, such as user IDs, passwords, and group IDs.

A principal is a representation of a human user or system entity, such as a server process. The choices for user registry are native OS (which takes advantage of OS/400 profiles) and Lightweight Directory Access Protocol (LDAP) OS/400 Directory.

Secure channel constraint requires an SSL protocol session along with a challenge type to provide data confidentiality and integrity for information flowing between the server


and a Web client. Secure channel constraint may be turned on or off. Dependencies limit how components can be used within an authentication policy. In Figure 2 (page 52), the possible combinations are represented.

The authorization policy determines how authorization is accomplished. Authorization consists of two steps: first, creating permissions and assigning those permissions to principals; second, verifying at runtime that the requesting principal holds at least one of the required permissions.

The WebSphere Application Server authorization model is based on the classic capability model, which is different from the access control model. With the capability model, permissions are associated with a principal. In the access control model, principals and the operations they can perform are associated with the resources themselves.

Resources include Web resources and EJBs. Web resources can only be accessed from Web clients, and for security purposes, each Web resource is represented by a Uniform Resource Identifier (URI). In other words, WebSphere security protects the URI. Since it is possible for a physical resource to be mapped by more than one URI, then one URI can be protected while another URI isn’t. To securely protect a physical resource (such as an HTML file), every URI for that resource must be protected.

With WebSphere Application Server Version 3.x, all Web resources can be protected with a single authorization policy. Any resource actually served by a Web server can be protected by the same authorization policy that protects servlets and JSP files that are served by an application server. However, this will not be supported in future releases. To protect Web resources in versions later than 3.x, those resources must be served by the WebSphere Application Server.

WebSphere security is granular to an enterprise bean home, but not to particular enterprise bean instances. For example, AccountBean is an enterprise bean that encapsulates the account information of account holders. A WebSphere administrator grants Bob access to the AccountBean, so Bob has access to every account in the system. It is not possible to specify that Bob should be able to access only his account and not others. This must be accomplished using application logic. An enterprise bean can belong to multiple enterprise applications.

By default, all enterprise beans are protected and no Web resources are protected when security is enabled. So, until authorization policy is configured, no enterprise bean can be accessed, but all Web resources can be accessed by anyone.

A Web application is a group of servlets that share a common servlet context. A Web application can belong to only one enterprise application. All servlets and JSPs belong to a Web application.

An enterprise application is a collection of Web applications, EJBs, and Web server resources. An authentication policy can be tailored to an application by modifying the challenge type and secure channel constraint values in the enterprise application.

A method group is a collection of {resource name, method name} pairs. For a Web resource, the resource name corresponds with the Web resource, as denoted by its URI, and the method name is an HTTP method. For an enterprise bean resource, the resource name corresponds with either the enterprise bean or its home, and the method name is one of the method names of the enterprise bean or its home.

At configuration time, the names of WebSphere resource methods can be used to determine membership in six predefined method groups. For example, if a method is called getName(), it would be added to the ReadMethods method group if the mapping to the default method groups is applied. Alternatively, the administrator can create new method groups and add methods to those method groups. The default method groups are as follows:

• ReadMethods includes all methods of an enterprise bean that have the prefix get; for example, getName (). For a Web resource, ReadMethods includes the HTTP_GET and HTTP_POST methods.


• WriteMethods includes all methods of an enterprise bean that have the prefix set; for example, setName(). For a Web resource, WriteMethods includes the HTTP_PUT method.

• RemoveMethods includes all remove() methods of an enterprise bean Home. For a Web resource, RemoveMethods includes the HTTP_DELETE method.

• CreateMethods includes all create() methods of an enterprise bean Home.

• FinderMethods includes all findXX() methods of an enterprise bean Home.

• ExecuteMethods includes all methods of an enterprise bean that do not fall under any of the aforementioned categories.

For any given WebSphere resource, a method can be associated with multiple method groups, but all methods must be associated with at least one method group.

A permission is a {enterprise application, method group} pair. To be authorized to invoke a method on a resource, a principal must hold a permission associated with both an enterprise application that contains the resource and a method group that contains the method. Permissions are assigned to privilege attributes (user ID or group ID, for example). The user registry maps principals to privilege attributes. A principal is considered to be holding a permission if that permission has been granted to at least one of its privilege attributes. Since permissions are defined by an enterprise application and a method group, authorization policy is implicitly tailored to applications.

To summarize, authorization policies correlate resources with (enterprise) applications and methods with method groups. Principals are granted permissions that result from these associations, and verification is done at runtime to ensure that the requesting principal holds at least one required permission. See Figure 3.

Delegation involves the use of an intermediary to invoke a method on a target resource on behalf of a requesting client. For example, a client invokes a method on a session enterprise bean that, in turn, invokes a method on an entity enterprise bean. The session bean is acting as an intermediary between the client and the entity bean. A delegation policy determines the identity under which the intermediary operates on behalf of the client.

In the WebSphere Application Server, the delegation policy is determined by values associated with the methods of the enterprise bean. The initial values are retrieved from the deployment descriptors of a bean but can later be modified by an administrator. Delegation policies can be applied jointly to all the methods in a bean or separately to individual methods.

A delegation policy is created by setting the values of one (or two) attributes: Run- As Mode or Run-As Identity. The Run-As Mode attribute determines the identity under which methods are to be run. The valid values are CLIENT, SYSTEM, and SPECIFIED. The Run-As Identity attribute specifies the principal when the Run-As Mode is SPECIFIED. This value must be selected by an administrator from an identity associated with one of the enterprise applications that contains the enterprise bean. When the authentication mechanism is native OS, the effective Run-As Mode is always SYSTEM, regardless of the value that is specified. LTPA supports all three values.

To sum up, WebSphere applications can be secured by configuring three policies: authentication, authorization, and delegation. Two authentication mechanisms are offered: native OS and LTPA. The native OS mechanism can only be used when all application servers are hosted by the same system. LTPA is the choice when application servers are hosted by different systems. Authorization is based on the capability model. This differs from the access list model, as permissions are associated with a principal in the capability


model, while in the access control model, principals and the operations they can perform are associated with the resources themselves.

Delegation is defined in terms of the Run-As Mode and Run-As Identity attributes assigned to EJBs. Authentication policy can be partly tailored to an application by modifying the challenge type and secure channel constraint settings for enterprise applications, while authorization policies are implicitly tailored to individual applications. The LTPA authentication mechanism is the heart of the distributed security model, providing a third-party security server that all application servers trust.

This overview, together with the Web sidebar “A WebSphere Configuration Scenario: Configuring Security” (posted at www.midrangecomputing.com/mc), which includes the instructions for enabling security and configuring a simple application, provides you with a good start but only begins to scratch the surface of WebSphere’s security features. Additional topics you may wish to investigate include enabling security for Java clients, single sign-on, HTTP session security, and programmatic support for login.

REFERENCES AND RELATED MATERIALS

• Extending WebSphere Applications for Business-to-Business Integration—AS/400 Edition: www.as400.ibm.com/ebusiness/expreport/wsappextend.htm
• IBM WebSphere page: www.iseries.ibm.com/websphere
• “IBM WebSphere Standard/Advanced 3.5 Security Overview,” Gennaro Cuomo, Don Ferguson, Michael Fraenkel, Rob High, and Nataraj Nagaratnam (available at www.ibm.com/software/webservers/appserv/security_v35.pdf)

Web Client Java Client HTML IIOP

Security Plug-in

Web Server WebSphere Application Server Web Server

Resources

HTML WebSphere

Resources

EJBs Servlets JSPs

Figure 1: Security policies can be configured to protect Web server and WebSphere resources.


OSE

Security Application Security Collaborator

 

Getting_Source_with_WebSphere06-00.png 355x145

 

Challenge Authentication User Client Type Mechanism Registry

None None None Web, Java

Basic LTPA LDAP Web, Java

Basic Native OS Native OS Web, Java

Certificate LTPA LDAP Web

Custom LTPA LDAP Web

Figure 2: Dependencies limit how components can be combined to form authentication policies.

Permission

Resource Method

Figure 3: Principals are granted permissions that result from associations involving applications, resources, methods, and method groups.


Principal

Enterprise Application

Method Group

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    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.

     

  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.

     

     

  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

  • The Biggest Mistakes in IBM i Security

    SB Profound WC Generic The Biggest Mistakes in IBM i Security
    Here’s the harsh reality: cybersecurity pros have to get their jobs right every single day, while an attacker only has to succeed once to do incredible damage.
    Whether that’s thousands of exposed records, millions of dollars in fines and legal fees, or diminished share value, it’s easy to judge organizations that fall victim. IBM i enjoys an enviable reputation for security, but no system is impervious to mistakes.
    Join this webinar to learn about the biggest errors made when securing a Power Systems server.
    This knowledge is critical for ensuring integrity of your application data and preventing you from becoming the next Equifax. It’s also essential for complying with all formal regulations, including SOX, PCI, GDPR, and HIPAA
    Watch Now.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.