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INTRODUCTION TO SECURITY
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We ll begin our security discussion with some basic definitions. In this section, we ll look at what security is and what that means. We ll also talk about what it isn t, which can be just as important.
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What security is Computer security is the field devoted to the creation of techniques and technologies that will allow computers to be used in a secure manner. Obvious perhaps, but there are two parts to the story. Secure means that the computer is protected against external danger or loss of valuables (financial, personal, or otherwise). The flip side is that the system has to remain useful. (There is a common joke in the security industry that the only way to make a computer completely secure is to turn it off, disconnect all of the cables, seal it in concrete, and dump it into the middle of the ocean. While this makes for a pretty secure computer, it s not a very useful one.) In approaching security, security requirements must be balanced with utility. If the techniques needed to secure a system are too hard to use, users won t use them, and the system will be unsecured. If they interfere with the basic tasks that need to be performed, they will be disabled or bypassed and the system will be unsecured. Are we getting the picture What security is not Security is not cryptography. This is oddly surprising to many people. Security uses cryptography it s one of the main tools used to secure an environment. They are, however, separate fields. The corollary is that unless you are a cryptographer, you shouldn t write your own cryptography code. It s very hard. And even the experts don t always get it right. And even if it s right today, it may be wrong tomorrow.
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At the time this book was written, the MD5 hash algorithm, which had been considered the gold standard for secure hashes, had been found to be vulnerable.
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The PowerShell environment, through .NET and the Windows platform, has access to a variety of cryptographic tools for building secure systems. You should use these tools instead of trying to roll your own. We ll spend a considerable amount of time on some of these tools later in this chapter.
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INTRODUCTION TO SECURITY
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Perception and security One last thing. Regardless of what computer security is or is not, sometimes it is the perception of security that matters most. Let s take a look at a couple of stories that illustrate this. The Danom virus As we have discussed, PowerShell can be used to write scripts. It can be used to create, copy, and modify files. This means that, like any scripting or programming language, it can be used to write viruses, worms, and other malware.
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The term malware is short for malicious software and is used to generally describe all of the forms of software (spyware, viruses, and so on) designed to cause damage in a computing environment. This may be the only definition in the security vocabulary that everybody agrees on. Or maybe not.
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The fact that PowerShell can be used for this purpose has not gone unnoticed in the malware community. In August 2005, a virus author created a proof-of-concept virus called Danom (Monad backwards). This virus script was essentially a port of existing virus code to the PowerShell language. This same virus code had previously been written in a variety of other scripting languages. It didn t take advantage of any vulnerability in either the operating system or the language interpreter. It required explicit and significant user action to execute the virus code. In fact, all it really did was demonstrate that PowerShell was a decent scripting language. There wasn t even a delivery vehicle. In other words, there was no way to distribute the malicious code. And with no mechanism to distribute the virus code, the threat was purely hypothetical. This coding exercise was noticed by a security researcher who then issued a bulletin about it. This bulletin was picked up, first by the blogs and later by members of the popular press, without really investigating the details of the situation.
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