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Security attempts to prevent nefarious persons from performing nefarious acts, and simpleminded fools from the tools they shouldn t use. This runs a wide range of activities, from detecting and preventing a denial of service attack on a public web server, to keeping a known user from accessing a function he s not meant to. You ll also need to establish what happens once a security breach does occur. Do you have enough information to detect what happens Do you have enough to recover Can you restore your data to a previously known, good state There are three main steps to security: authentication, authorization, and auditing. Authentication involves identifying the users of your system, and denying access to functionality to those users who cannot identify themselves. Authorization concerns making sure authenticated users have permissions to run the function or see the data they re attempting to access. Auditing ensures your ability to investigate and recover if something goes wrong with
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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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the first two. Can you tell there was unauthorized access or use of the system Can you undo what was done Data must also be secured. You can secure data by encrypting it, or by keeping it in an otherwise secure data store. An opportune time for encryption is when you re moving data around on the network, or sharing data with partners. Typically, when you re done moving it around, you write it down in a source of persistence that keeps it safe for you, like within a relational database that requires credentials for access. In Table 1-2, we ve outlined security concerns and their solutions in .NET. Table 1-2. Security Concerns and .NET Solutions
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Concern
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Windows (Kerberos/ NTLM) ASP .NET Forms-based security Active Directory IIS Passport Windows role-based security custom roles in ASP.NET code access security Secure Sockets Layer (SSL) Certificate Server, Encryption library in the Framework class library IIS logs SQL Server logs and backups NT application logs traceability E2E instrumentation (future) Security Policy Groups NT application logs Windows integrated security Impersonation Active Directory others.
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Do we know you have permission to do what you re doing Can we get the data to you in a secure manner
Authorization
Encryption
Can we recover from an attack
Auditing
Will this security infrastructure be manageable as we grow
Integrated security as opposed to a silo-based approach
In 5, we take a close look at the .NET specific security atoms.
Maintainability
Maintainability is concerned with the evolution of your system over time. It s highly unusual to ship an application and have all business stakeholders and users simultaneously proclaim Yes! Yes! This is exactly what we needed! It does the job perfectly! It s more likely that they ll start requesting changes right away. Sometimes they ll wait a day while your team recovers from pulling an all-nighter to get the thing working in production in the first place, but when they do make requests, what type of changes to the system can you expect Your initial requirements may be quite a bit more ambitious than what you ve committed to ship on the application s first iteration. Office was not built in a day. However, knowing the requirements that will be present in future iterations can be of great benefit during the architectural design phase, as you can take some of these features into account in the solution.
CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
The application may also have a subset of features that are so volatile that it may be worth the investment to create some user interfaces that are entirely polymorphic in their behavior, and create a tool for end users (or power users) to control how this portion of the interface gets rendered. There may even be a vendor-supplied tool that meets these requirements for you. Content management systems and Web portal packages are just a couple of examples of generalized solutions that let qualified users affect the application at a higher level of abstraction than cranking out and compiling code. Your application may have requirements that can be met by network or application administrators via configuration files or Microsoft Management Console (MMC) snap-ins. These are tasks technical people need to perform, but they don t necessarily require a developer to change code that then needs to be compiled and shipped. Checking a code file out of source control and having a developer make changes to it is the most expensive kind of change that can be made to a system. It requires a developer (not cheap). It requires the recompilation of binaries. It requires regression testing of all areas of the application that are affected by a change to that binary (testers, automation, and time: aka more money). And then it takes a deployment and all of the requisite worry, heartache, and long hours that can accompany that. Customizability frequently comes up when discussing these types of features. A fully customizable solution is a totally nontrivial undertaking that can doom a project to never even ship a decent V1 (think of how long it took Microsoft to get Access right oh wait that hasn t happened yet ). But there may be key features of your application that you can move into configuration, or you can create an administrative applet to tweak, or for which a vendorsupplied solution nicely fits the bill. The other type of change anticipation involves minimizing how many components of a system will be affected when the inevitable change is requested. Even if the anticipated change does require developer involvement, isolating that change from other functional areas of the system minimizes the number of binaries affected and, therefore, the complexity of the regression testing that must be done. This may be a choice as simple as making some set of functionality interface based, so that a developer can create new implementations of the interface, and the production system can use late-binding and Reflection to pick up and execute an assembly with the new implementation. Intertech Software has an ingenious shell application that can have entirely new applications added to it just by dropping an assembly that implements a predefined set of interfaces into a directory that the shell is watching. XCopy and you re done; everything else flows from there. This leads to an important tenet of service design, that of not creating tight couplings between service components in the system. You don t want to be in a situation where a change to a single class causes a cascade effect of changes to other components. This atomic design is the thrust behind loosely coupled services. Not only does this increase maintainability, but it also increases the reuse of your services, as the more atomic and independent they are in the work that they do, the more ways they ll be able to be combined with other services. We discuss the design of loosely coupled components when we look at Web Services in the .NET Framework in 6.
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