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2.2. Designing-In Security
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At the highest level, designing security into a software application means that one should keep security in mind while building it, starting with its requirements and design. It is not advisable to write your code first, and then worry about making it secure afterward. Experience has shown that it is very hard to add on security later. The following subsections provide two common examples that illustrate the importance of designing-in security from the start. We then discuss problems inherent in trying to protect such vulnerable systems by creating yet more systems to act as gatekeepers.
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CHAPTER 2 s SECURE SYSTEMS DESIGN
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2.2.1. Windows 98
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Problems occasionally arose in Windows 98 in which a diagnostic mode is needed to deal with the issue. For example, if some device driver locks up while the computer is booting up,1 the Windows 98 diagnostic mode can be used to help determine which device drivers may be causing the problem. The Windows 98 diagnostic mode does not load up all device drivers at boot time. You can access the diagnostic mode in Windows 98 by pressing the F8 key while the operating system is booting up. Even if a computer is password protected, anyone can hit the F8 key at boot time, and the computer will jump into its diagnostic mode, giving the user the ability to access the hard disk and any sensitive data on it without entering a username or password. In Windows 98, the security feature of entering a username and password was added into the operating system as an afterthought, as opposed to being part of the initial design of the operating system. If instead the operating system was designed with security in mind, then it might ask a user to enter a username and password to even enter the diagnostic mode. The design of the Windows 98 password mechanism is an example of how adding security as an afterthought does not work.
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2.2.2. The Internet
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Another example of how it is very difficult to add security as an afterthought is the design of the Internet itself. When the Internet was designed, all of the hosts (computers) on the network were effectively trusted because they were owned by universities or military installations that trusted each other and wanted to collaborate with one another. (The Internet grew out of a government project funded by DARPA, the Defense Advanced Research Project Agency.) In the mid-1990s, due to the mass commercialization of the Internet, just about everyone started connecting their computers to the Internet. New hosts were allowed to connect to the existing hosts regardless of whether the existing parties on the network trusted the newly connected hosts. To protect themselves, some hosts started deploying firewalls.
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Firewalls and Their Limitations
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A firewall allows hosts to specify that they trust some hosts to connect to them on some ports while they do not trust other hosts or accept traffic on other ports. However, due to the way that the Internet was designed, firewalls are not always necessarily able to enforce the trust relationships their users would like, since hosts can lie about IP addresses or communicate over ports that have been cleared to go through the firewall. Consider two hosts, Alice (A) and Bob (B). For A to send a message to B, A needs to construct an Internet Protocol (IP) packet. You can think of an IP packet as a letter that one might send in the mail, except that it is transmitted over a wire instead of dropped into a mailbox. The data packet has two parts: an envelope, sometimes referred to as the IP header, and the message itself. The IP header contains host B s IP address (the destination address). The message contains the data that A would like to send to B.
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1. A device driver is a piece of software that allows a computer to use a hardware device that is attached to it. Device drivers are responsible for communicating between the operating system running on a computer and the hardware device that is attached to it. Device drivers are notorious for bugs that can cause an operating system to malfunction or crash altogether.
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