Java IoT Authors: Zakia Bouachraoui, Pat Romanski, Elizabeth White, Liz McMillan, Yeshim Deniz

Related Topics: Java IoT

Java IoT: Article

JAAS in the Enterprise

An integration proposal

Since 2001 when Java Authentication and Authorization Service (JAAS) was formally included in the Java 2 Platform Enterprise Edition (J2EE) 1.3 platform specification, the J2EE community has been grappling with the issue of JAAS/J2EE integration. On the surface, JAAS seems to be an excellent complement to J2EE: JAAS defines a pluggable Application Programming Interface (API) for authentication modules and a fine-grained Subject-based authorization model, which are both lacking in the existing J2EE security model. Since JAAS is officially part of the J2EE platform specification, it's not unreasonable to expect that you can now leverage the JAAS framework to build portable enterprise applications that have advanced authentication and authorization requirements. Unfortunately, any Java architects or developers who go down this path for their applications will soon be confronted with the harsh reality: Instead of finding a landscape defined by an unified integration architecture, they'll discover a landscape littered with incompatible vendor-specific APIs and frameworks.

If JAAS and J2EE seem to fit well together, why is there such a fragmented landscape? What has contributed to this fragmentation, and more importantly, what lies ahead? In this article we'll explore the main security issues that architects and developers must consider when designing J2EE-based solutions for enterprise deployments. We'll also highlight some of the ongoing standards-based efforts that will make it easier to include advanced authentication and authorization capabilities in your enterprise applications. Finally, we'll offer some pragmatic strategies you can consider today, while waiting for the standards to catch up.

JAAS is designed to bring Subject-based authentication and authorization to the Java 2 platform. On the authentication side, JAAS is modeled after the Pluggable Authentication Module (PAM)-a popular API for defining authentication modules in a portable and extensible manner. On the authorization side, JAAS inherits the rich, fine-grained, and extensible security model defined in Java 2. When JAAS was first introduced as an optional package for JDK 1.3, there was, understandably, quite a bit of excitement: "Finally, a real security standard for the Java platform!" (Not that code-based security isn't important, but a lot of us were waiting for a user-based authentication and authorization model.)

Indeed, JAAS 1.0 did achieve a few significant wins for Java developers. It offered a standard way to develop authentication modules (via JAAS LoginModules - see Figure 1) and a flexible way for the authentication modules to gather information dynamically from the application (via CallbackHandler - see Figure 2). It also offered a way to integrate Subject-based authorization into the Java 2 platform without affecting the code-based security model.

Of course, being hard-nosed, pragmatic people, we were also realistic - or so we thought - in our expectations: "It's only Version 1.0 of this API, and it's released as an optional extension, to boot. It'll probably be a few years before it goes mainstream."

Not surprisingly, when JAAS 1.0 was introduced, there were a few issues. As an optional extension, the JAAS jar files weren't generally available as part of the regular JDK distribution. In addition, its add-on nature was reflected in the API design - instead of having one policy that dealt with both Subject- and code-based policies, we had to deal with two separate policies (each with its own API) and some obscure DomainCombiner logic that updates the protection domains based on these policies at runtime.

Fortunately for Java developers everywhere, these issues largely went away when JAAS was fully integrated into the core Java security architecture in JDK 1.4: JAAS was distributed as part of the regular JDK distribution, and the Java 2 security model is now the JAAS security model - one security model, one policy API. (Please refer to Java 2 Security Architecture ( http://java.sun.com/j2se/1.4.2/docs/guide/security/spec/security-spec.doc.html) for more details about JAAS/J2SE security model.)

Most Java developers would agree that if there were a Java development platform that could really benefit from a user-based authentication and authorization standard, it would be the J2EE platform, where security is paramount and user-based security, in particular, is essential to any enterprise-ready applications. Thus J2EE, unlike J2SE (Java 2 Platform Standard Edition), came with a rather sophisticated user-based security model since J2EE 1.0. With the introduction and subsequent integration of JAAS into the J2SE platform, the main question has now become: "How do we integrate JAAS into J2EE?" (This is a question Graham Hamilton posed to the Java security experts at a one-day Java security summit held in Boston shortly after JAAS 1.0 was introduced.)

On the surface, it appears that JAAS and J2EE complement each other very well. Although J2EE defines a declarative way to configure the authentication method to be used with a Web/EJB module, it doesn't define a pluggable authentication module API; JAAS (with its LoginModule API) nicely fills this void. And although J2EE authorization serves quite well the security needs of typical (security-unaware) Web-based and EJB-based applications, it's also a rather coarse-grained and inflexible model (the only privileges supported are URL-based and EJB method-based). The JAAS/Java2 permission-based model is extensible and can model arbitrarily complex and fine-grained authorization policies.

Given these considerations, it wasn't surprising that shortly after its introduction, JAAS 1.0 was included as part of the J2EE 1.3 platform specification. Unfortunately - perhaps due to time and resource constraints - there were no provisions in the J2EE 1.3 specification regarding how JAAS 1.0 was to be integrated into J2EE-compliant containers. In other words, it'd be up to each container vendor to figure out the right integration strategy. Inevitably, because different vendors decided to do this in different enough ways, the fact that JAAS 1.0 was officially part of J2EE 1.3 isn't very meaningful to Java developers - at least to those who care about developing portable J2EE applications.

  • Consider authentication: While it's possible to write a JAAS-based login module that works properly in a J2EE 1.3/1.4-compliant container, it'd be difficult - in fact, almost impossible - to write one JAAS login module that works equally well in all J2EE 1.3/1.4 containers.
  • Consider authorization: While it would be possible for a J2EE application to use the JAAS policy API and Java 2 permission model to handle fine-grained authorization policies, it'd be impossible for such an application to retrieve the JAAS Subject (representing the currently authenticated user) in a portable manner.
JAAS/J2EE Integrated: Secure Enterprise Applications
Before we get into too much detail, let's step back and ask ourselves: "What would a truly JAAS/J2EE integrated architecture look like?" Put it this way. If you were the project manager responsible for this integration project, what would be on your project's wish list?

First, let's consider authentication: JAAS has defined a portable, extensible API for authentication modules that lets you reuse a well-behaved LoginModule implementation in different contexts. What does this mean in a J2EE context? We believe a reasonable goal for a JAAS/J2EE integration architecture would be to let any JAAS-compliant login module be plugged into any J2EE-compliant container - without any modifications. In other words, you should be able to develop or buy/download an RDBMSLoginModule to use with your applications and expect it to work well in all J2EE-compliant application servers that might end up hosting your applications. Given certain reasonable constraints (for example, the RDBMSLoginModule shouldn't use any protocol-specific Callbacks), it should also work equally well for most of the managed resources (such as servlet/JSP, EJB, or MBeans) over a variety of connection protocols (such as HTTP, RMI/IIOP, or JMX/RMI).

Now, let's consider authorization. We believe a properly designed integration architecture should cover the following: First, the J2EE authorization model should work properly in a JAAS/J2EE context. In other words, using a JAAS LoginModule to handle authentication for your application doesn't mean you want to get rid of the nice declarative security constraints you've worked hard to exactly fit your application. Also, the managed component (such as Servlet/JPS, EJB, or MBeans) should be invoked in an execution context where the currently authenticated user (represented by a JAAS Subject instance) is readily available (via JAAS API) to the component. (In standard JAAS, this typically means the managed component is invoked within a Subject.doAs[Privileged] block.) Finally, the legacy J2EE authorization API (such as isCallerInRole/getCallerPrincipal) should work properly in a JAAS/J2EE context; this means that if your application is security-aware and uses isCallerInRole to do advanced role-based processing, your application should continue to work in a JAAS/J2EE-integrated environment.

So far, we've only outlined the basic requirements; these ensure that JAAS and J2EE play well with each other, and that the legacy applications or modules developed with either context in mind continue to work well in an integrated environment. A JAAS/J2EE integration framework that implements these requirements in a reasonable manner might be considered a solid investment, but probably not something worth jumping up and down about.

Yet these basic requirements do bring about a level of power and sophistication not seen before in J2EE security. For instance, by leveraging the integrated JAAS/J2EE architecture, you can finally build advanced enterprise applications that authenticate via a custom (application-specific) user repository (via standard JAAS LoginModules); leverage a coarse-grained J2EE authorization model for pre-dispatch authorization decisions; and leverage a customized, fine-grained JAAS permission model to protect application-specific resources. And you achieve all of these without sacrificing portability.

This is nothing to be sneezed at - and if you're like us, you're probably salivating at the possibilities this combination has opened up for your application architecture...

Not so fast. Yup - there's a catch.

The Current Landscape
Equipped with this modest list of requirements, we're ready to evaluate the current landscape. As an industry, how do we fare in this context? In a nutshell, not very good. In fact, if we use this basic requirement list as a scorecard, most vendors wouldn't do well at all.

More Stories By Raymond K. Ng

Raymond K. Ng has been a professional software developer for 15 years and has been involved in high-scale enterprise Java development since JDK 1.0. He currently serves as architect and development lead of Oracle Platform Security Services (OPSS) and serves on the JCP Expert Groups for JSR 115 (JACC) and JSR 196. Raymond is a Consulting Member of the Technical Staff at Oracle Corporation and is the holder of multiple patents.

More Stories By Ganesh Kirti

Ganesh Kirti is a Senior Software Development Manager at Oracle with 11 years of industry experience. He currently leads development of Java Platform Security in the Oracle Fusion Middlewrae group at Oracle. Ganesh has a wide range of engineering experience including developing Identity Management and SOA Security products.

Comments (1)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.

IoT & Smart Cities Stories
Moroccanoil®, the global leader in oil-infused beauty, is thrilled to announce the NEW Moroccanoil Color Depositing Masks, a collection of dual-benefit hair masks that deposit pure pigments while providing the treatment benefits of a deep conditioning mask. The collection consists of seven curated shades for commitment-free, beautifully-colored hair that looks and feels healthy.
The textured-hair category is inarguably the hottest in the haircare space today. This has been driven by the proliferation of founder brands started by curly and coily consumers and savvy consumers who increasingly want products specifically for their texture type. This trend is underscored by the latest insights from NaturallyCurly's 2018 TextureTrends report, released today. According to the 2018 TextureTrends Report, more than 80 percent of women with curly and coily hair say they purcha...
The textured-hair category is inarguably the hottest in the haircare space today. This has been driven by the proliferation of founder brands started by curly and coily consumers and savvy consumers who increasingly want products specifically for their texture type. This trend is underscored by the latest insights from NaturallyCurly's 2018 TextureTrends report, released today. According to the 2018 TextureTrends Report, more than 80 percent of women with curly and coily hair say they purcha...
We all love the many benefits of natural plant oils, used as a deap treatment before shampooing, at home or at the beach, but is there an all-in-one solution for everyday intensive nutrition and modern styling?I am passionate about the benefits of natural extracts with tried-and-tested results, which I have used to develop my own brand (lemon for its acid ph, wheat germ for its fortifying action…). I wanted a product which combined caring and styling effects, and which could be used after shampo...
The platform combines the strengths of Singtel's extensive, intelligent network capabilities with Microsoft's cloud expertise to create a unique solution that sets new standards for IoT applications," said Mr Diomedes Kastanis, Head of IoT at Singtel. "Our solution provides speed, transparency and flexibility, paving the way for a more pervasive use of IoT to accelerate enterprises' digitalisation efforts. AI-powered intelligent connectivity over Microsoft Azure will be the fastest connected pat...
There are many examples of disruption in consumer space – Uber disrupting the cab industry, Airbnb disrupting the hospitality industry and so on; but have you wondered who is disrupting support and operations? AISERA helps make businesses and customers successful by offering consumer-like user experience for support and operations. We have built the world’s first AI-driven IT / HR / Cloud / Customer Support and Operations solution.
Codete accelerates their clients growth through technological expertise and experience. Codite team works with organizations to meet the challenges that digitalization presents. Their clients include digital start-ups as well as established enterprises in the IT industry. To stay competitive in a highly innovative IT industry, strong R&D departments and bold spin-off initiatives is a must. Codete Data Science and Software Architects teams help corporate clients to stay up to date with the mod...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
Druva is the global leader in Cloud Data Protection and Management, delivering the industry's first data management-as-a-service solution that aggregates data from endpoints, servers and cloud applications and leverages the public cloud to offer a single pane of glass to enable data protection, governance and intelligence-dramatically increasing the availability and visibility of business critical information, while reducing the risk, cost and complexity of managing and protecting it. Druva's...
BMC has unmatched experience in IT management, supporting 92 of the Forbes Global 100, and earning recognition as an ITSM Gartner Magic Quadrant Leader for five years running. Our solutions offer speed, agility, and efficiency to tackle business challenges in the areas of service management, automation, operations, and the mainframe.