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Point-to-Point Pattern
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A point-to-point architecture is used to solve tactical needs of integration, such as keeping passwords in sync or managing roles and privileges across multiple directories Basically, it is a solution for synchronizing identity information between application silos An example of a point-to-point implementation is a directory replication All major LDAP servers (Oracle, Active Directory, SunOne, and so on) have the notion of replication built into their core products, and we can spread out many instances of each directory over large geographies and still maintain a certain level of consistency of identity information Alternatively, you can have point-to-point integrations for synchronizing between heterogeneous applications and environments such as the Oracle and the Microsoft technology stacks However, the fundamental solution is the same: synchronize user identity from one repository to another without necessarily changing how that user information is managed and administered in each of those systems The advantage of a point-to-point architecture is that it is a relatively simple solution to understand and implement It also does not change the control of the information in any system, since the administrators of the different systems are still as powerful and as free to do as they wish with their data However, the point-to-point model has significant limitations when the enterprise is looking to centralize management to a single point of control Also, it adds complexity in terms of managing independent point-to-point integrations of identity and access information between applications Therefore, if this style of integration starts to grow in an enterprise, the architecture should start to consider the next phase in its evolution, hub-and-spoke
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Hub-and-Spoke Pattern
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The hub-and-spoke pattern looks similar to a standard Ethernet switch in today s computer networking landscape A single device supports many connections using a standard networking interface to allow for all connected parties to communicate Similarly, an identity management infrastructure, if properly configured, can act as that central hub for managing users and their access into all your enterprise-wide systems and applications Once every application and system is connected into this hub, users are able to communicate with each other through this standardized and centralized identity management infrastructure Keep in mind that not all connected applications carry the same weight and influence Some of the applications connected to this identity management hub may be more influential and may drive the identity management processes in the other applications For instance, the data from the human resources application (for example, PeopleSoft HCM or SAP HR) can drive the user provisioning policies and processes to the other connected applications (such as ERP systems and LDAP servers) Identity management hub-and-spoke architecture requires a bit more design and planning than a pure point-to-point implementation, since you need to establish some enterprise-wide ground rules for identity For instance, if all identities are going to be centralized into a single hub, an enterprise user naming convention must be implemented While you can continue to use application-centric usernames, the enterprise naming conventions need to map to those local application usernames The benefit of this approach is centralization and therefore reduction of the cost and complexity of managing new and existing identities in the enterprise It can provide some simple but powerful centralized solutions, such as password resets and new account services across all systems This approach is critical for an enterprise looking for an audit compliance and governance solution A centralized identity management hub can provide a single view and report on who has access to what systems It can also provide workflow services so that all those accounts are regularly inspected and attested for continuing authorization, as mandated by laws such as Sarbanes-Oxley Another key benefit of the hub-and-spoke model is that it allows for a much simpler integration model into heterogeneous packaged applications (for example, Oracle Applications, SAP, Windows Server products, and so on) if you are employing a solution such as Oracle Identity Manager (OIM) that ships with a library of standard prebuilt connectors (Refer to 9 for more details on OIM s integration capabilities) While a majority of customers and enterprises today are spending most of their investments in ramping up to this hub-and-spoke architectural pattern for identity management, it does have certain limitations The limitations are especially pronounced when we try to integrate customdeveloped applications or services that are being developed inside the enterprise While it is possible for a custom application to integrate into the centralized hub to leverage existing identity management services (for example, new user provisioning, runtime authorization decisions, runtime auditing, and so on), this is usually a development and maintenance nightmare Due to the lack of standards around the identity services, it is almost always a one-off integration that cannot be reused and extended over time The benefit of a centralized Identity management service infrastructure is quickly drowned out by the pains of writing that custom integration code and maintaining it over the lifespan of the application Such integration limitations in the hub-andspoke model has given birth to a new generation of architecting security called service-oriented security (SOS), also referred to as security-as-a-service
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