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Many operating systems, such as Mac OS, Microsoft Windows, and Unix, require a user to log into the system before it can be used. All provide either a dedicated login program or a prominent log-in window for the user to provide their identity and password. The boundary protection is built into the operating system by not allowing programs to be run by unauthorized or anonymous users.
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Other patterns in this book, such as the firewall patterns in 12 and PROREVERSE PROXY (457), provide examples of effective single access points, in which the clients are not always users, but can be network traffic that needs entry to the protected system.
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The following benefits may be expected from applying this pattern:
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It provides a single place to go for entering the system, a clearly defined entrance for users of the system, and a single place to set up the system or application properly. It provides a single place to guard your system: you only need to trust your gate guards at the single access point within your system. However, applying Defence in Depth might be required to improve security further. The inner structure of system is simpler, because repeated authorization checks are avoided. The system trusts the single access point. No redundant authorization checks are required: once the access point is passed, the system trusts the client. It applies to many levels of abstraction.
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The following potential liabilities may arise from applying this pattern:
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Having just a single access point may make the system cumbersome to use, or even completely unusable. For a medieval city, if you arrive from the wrong direction, you have to walk right round the city just to reach its gate. You need to trust your gatekeeper and your city wall. However, it might be easier to check the single access point instead of multiple ones. Nevertheless, the boundary protection still can be a weak point of your system. The single access point might need to check the client on entrance more thoroughly than is required in the concrete situation, thereby annoying the client or slowing down entrance unacceptably. In a complex system, several single access points might be required for subsystems. The single access point might become a single point of failure. If the single access point breaks down, the system might become unusable, or its security compromised.
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CHECK POINT (287) and SECURITY SESSION (297) both provide details of how to implement access control based upon SINGLE ACCESS POINT (279) in a flexible and effective way.
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Check Point 287
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Once you have secured a system using SINGLE ACCESS POINT (279), a means of identification and authentication (I&A) and response to unauthorized break-in attempts is required for securing the system. CHECK POINT (287) makes such an effective I&A and access control mechanism easy to deploy and evolve.
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Policy Definition Point (PDP), Policy Enforcement Point (PEP), Access Verification, Holding off hackers, Validation and Penalization, Make the Punishment fit the Crime, Validation Screen, Pluggable Authentication.
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The mayor of our medieval town that established SINGLE ACCESS POINT (279) with their gate and guard is concerned about their protection during times when different threats come close to the town. For example, the merchants would like to have the gate freely open during daytime, to let traders in and out easily. However, they are concerned about burglars sneaking into their warehouses during night time.
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System Access Control Architecture
Context
You have a system protected from unauthorized access in general, for example by applying SINGLE ACCESS POINT (279). Nevertheless, you want authorized clients be able to enter your system.
Problem
Whenever you introduce a security measure, you often do not know in advance about all its weaknesses. Also, you only learn how it influences usability if you deploy it to actual users. A protected system needs to be secure from break-in attempts, and appropriate actions should be taken when such attempts occur. On the other hand, authorized clients should still be able to enter the protected system, and should not be impeded too much when they (in the case of a human) make a mistake when providing their credentials. In addition, you want to consider the change of requirements for identification and authorization (I&A) that might occur over time, either because you need to address new threats, or because you learn from its use. One example for handling that situation is the development of a protected system in which a developer will use a dummy I&A implementation to test the system, without the hassle of logging into the system for every test. Later on, the deployed system needs to be protected by a log-in mechanism that authenticates and authorizes its users. How can you provide an architecture that allows you to effectively protect system access while still being able to tune I&A to evolving needs without impact to the system you protect The solution to this problem must resolve the following forces:
Having a way to authenticate users and provide validation about what they can do is important. Human users make mistakes and should not be punished too harshly for them. However, too many consecutive mistakes at authentication by a user can indicate an attack to the system and should be dealt with. Different actions need to be taken depending on the severity of the mistake and current context. Spreading checks throughout your protected system increase complexity and make it hard to change. It would be helpful to have a single place to which to refer for authentication and authorization of users.