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WRITING SECURE SCRIPTS
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one scriptblock for each operator; for example, the eq operator is shown in E. If the operator isn t one of the ones we re chosen to implement, we ll throw an error F. Once we ve selected the scriptblock, we ll invoke it G once for each inbound pipeline object. Notice that we don t pass any arguments to the scriptblock. Dynamic scoping allows the scriptblock to pick up the arguments from the enclosing scope. This second implementation is clearly more complex; however, it does more error checking, is more robust in general, and has no code injection vulnerabilities. It is also significantly faster than the Invoke-Expression version. (It also makes a good illustration of the use of scriptblocks.) There are many more examples where we can replace Invoke-Expression with scriptblocks, but in the end, the approach is basically the same decide whether we really need to generate code at runtime or whether we can just select from a set of precompiled alternatives. If the set of alternatives is large, you may want to use a hashtable instead of a switch statement, but the principle remains the same. This brings us to the end of our discussion of security and PowerShell. Securing systems and writing secure code can be a subtle, twisty, and arcane topic. It can also be alternately completely fascinating or as dull as toast.
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Let s review what we covered in this chapter. We began with a rant (sorry discussion) on security and threat modeling. We covered: What security is: mechanisms for operating a computer without the risk of danger or loss. That security is not equivalent to cryptography and its related technologies (although these tools are used to build a secure system). Basic threat modeling and the STRIDE approach. Definitions for the elements of a threat model: vulnerability, threat, asset, and mitigation. In the next section, we covered securing the PowerShell installation itself. This included discussions of how PowerShell is secure by default. As installed, PS limits its attack surface by: Having no default file association; this prevents use of attachment invocation or point-and-click social engineering attacks. Exposing no remote access method, forcing a hopeful attacker to depend on other tools. Having a default execution policy of Restricted, which prevents any scripts from running. Not including the current directory in the command search path, preventing working directory exploits.
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CHAPTER 1 3
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SECURITY, SECURITY, SECURITY
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Additional issues around managing the execution path. Execution policy what it is and how you can examine the current EP using Get-ExecutionPolicy. To allow signed scripts to run, use Set-ExecutionPolicy AllSigned, and to allow any local scripts to run the loosest reasonable policy use Set-ExecutionPolicy RemoteSigned. Script signing: how it works and how to set up certificates, keys, and so on. The final part of the chapter covered technologies and techniques we can use for making our scripts more robust. The topics we covered included: That we should always store sensitive information in memory using the .NET SecureString class and that we can read data as a secure string from the keyboard using the Read-Host cmdlet. Working with credentials and using the Get-Credential cmdlet. Approaches for avoiding the use of Invoke-Expression in scripts. Computer security is a complex, evolving field. It is obviously important to keep abreast of the latest tools and techniques, as well as monitor the current crop of threats and exploits. However, while thinking though a problem can be facilitated by tools and models, it cannot be replaced by them. In the end, there is no replacement for common sense.
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Comparing PowerShell to other languages
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Most people will come to PowerShell with experience using other languages or shells, so in this appendix we ll compare PowerShell to a number of common shells and languages people may know. We ll spend most of our time on cmd.exe (the traditional Windows shell) and the UNIX shells. We ll also look at a variety of issues that Perl, VBScript, and C# programmers may encounter. Along the way, we ll introduce a number of handy techniques that will be of interest to the general PowerShell user.
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