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In this chapter, we ll review security modeling concepts, and then look at the security features in PowerShell. We ll also look at how to write secure scripts in PowerShell. Boring, you say. Do we really need to know this stuff Yeah, we do. In a connected world, security is incredibly important. A small mistake can have huge consequences. People will talk about a zone of influence the idea that something that happens far away can t impact us. This idea is basically meaningless in a connected world. Anyone anywhere can attack your system just like they were next door. We also have to consider cascading consequences: a useful script that someone posts on his blog may get copied thousands of times. If there is a security flaw in that script it will propagate along with the script; get copied into new scripts, and so on. A small flaw in the original script may now be replicated around the world. Now that we are all appropriately terrified, let us proceed. When discussing security and PowerShell, there s only one thing to keep in mind. PowerShell executes code. That s what it does that s all it does. As a consequence, we 440

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need to consider how having PowerShell on your system might introduce security risks. Of course, this is not specific to PowerShell. It s true of anything that runs code Perl, Python, even cmd.exe. Making sure that a system with PowerShell installed is secure is the topic of the first part of this chapter. Once you have PowerShell installed, of course you re going to want to write, deploy, and execute scripts. The latter portion of the chapter covers some approaches to writing secure PowerShell scripts.

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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SOLUTION We see that f (i ) = i i = 0 and g(i ) = i 2 i + 1 + i = 1 i + 1 + i = 0 , so we apply the rule Computing the derivatives we get d (z i) = 1 dz d g ( z ) = ( z 2 z + 1 + i ) = 2 z 1 dz f ( z ) = Therefore 1 1 z i = lim = z z + 1 + i z i 2 z 1 2i 1

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.

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.

Now let s work our way up to one of the most important and elegant results in all of mathematics, the Cauchy-Riemann equations These equations, which were independently discovered by the mathematicians Augustin Louis Cauchy (1789 1857) and George Friedrich Bernhard Riemann (1826 1866) (Riemann derived them in his doctoral dissertation) allow us to quickly determine whether or not a function is analytic To start, we write a function f ( z ) of a complex variable in terms of real and imaginary parts: f ( z ) = u( x , y) + iv ( x , y) (313)

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