Simplifying the Security Matrix in .NET framework

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Simplifying the Security Matrix
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The success of modern IT systems security controls rests in seven essential elements that compose the security matrix (see Figure 5-1):
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Identification Authentication Authorization Access control Administration Auditing Assessment
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The strengths of each matrix element in your access controls design and implementation are combined to determine the overall strength of your system s security profile. Weakness in any element impairs your security.
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SECURITY MATRIX
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IDENTIFICATION Figure 5-1 Security matrix elements combine to create the overall security profile.
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These seven topic areas are the substance in which information technology security originates. Even among some security professionals, the definitions or roles of these essential elements of security are not universally understood. For example, one area of that is often misconstrued is the limits of today s technology for providing nonrepudiation from authentication methods. Online financial transactions and business processes seek assurance that the person logged in is the one whose identity is being used. In legal terms, the assurance sought is defined as nonrepudiation. The level of trust that can be placed in any authentication method is not absolute regardless of the technology. Some methods are better than others, and it is important to grasp the remaining risks for the choices made. This chapter clearly defines all seven elements of the security matrix, sets their boundaries, and explains how they are combined in creating more secure access controls, as well as how they work interactively to enhance overall system and application security.
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Understanding Identification
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In the impersonal space of the Internet or on a company intranet, how can you be certain the end user is really who he or she claims to be How do you know
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Simplifying the Security Matrix
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the purported identity is valid Similarly, with a hacker s ability to spoof IP addresses, devices with firmware capable of mimicking MAC addresses, and just about any firewall s capability to NAT (Network Address Translation) IP addresses, how do you achieve certainty in the identity of a device to be granted access rights to another device on your secure network How much confidence do you have in the true identity of a person or device trying to gain access to your applications How much reliance are you willing to place on that identity being the true identity Keep in mind that your systems only see the digital username and whatever is presented as a digital credential. Anyone could be at the distant end trying to log in to your systems with stolen or guessed credentials. It is important to differentiate between the true identity of a device or person and a username as a representation of that identity. Do not confuse identity with any of the other elements in the matrix. Someone or something is simply purporting to be someone you want to deal with through your networks, computer systems, or applications by entering a username the system is supposed to recognize. Build your acceptance of any class of usernames on the up-front vetting of users and a process to issue unique usernames. There is a very low limit to how much confidence can be placed in the identity element by itself. If the syntax of your usernames is known, for example, then guessing one is made easier.
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A Case of Mistaken Identity
A mid-Michigan radio call-in show receives a request for some Moody Blues songs. The caller has a strong Scottish-sounding brogue and identifies himself as Sean. He says he is calling on a cell phone from his limousine as he s traveling from Detroit to Grand Rapids. The DJ, a young woman, is excited about talking with a celebrity, a superstar (namely, Sean Connery) and plays the songs the caller requested; in the interludes she talks about her favorite bigscreen flicks in which he starred. There is only one problem; that day Sean Connery was somewhere in the British Isles. To give the DJ some credit, it did sound an awful lot like him, but it simply wasn t him. It was a classic case of mistaken identity. The credential that was presented the sound of a voice with a distinctive brogue was not sufficient to be certain of the identity of the caller.