Security recommendations in VB.NET

Drawing Data Matrix 2d barcode in VB.NET Security recommendations

Security recommendations
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user to do that, and to explain to them how to do it, so Microsoft didn t focus on that scenario as a potential attack vector. Just remember that PowerShell doesn t grant your users any additional permissions: they will only be able to do those things that you ve permitted them to do. Sure, someone could call a user on the phone, or send them an email, and walk them through the process of opening PowerShell, typing a few commands, and damaging their computer. But that same someone could also call a user and walk them through the attack using means other than PowerShell. It would be just as easy (or difficult, depending on your viewpoint) to convince a user to open Explorer, select their Program Files folder, and hit Delete on their keyboard. Actually, that would be easier than walking them through the equivalent PowerShell command. I point this out only because people tend to get nervous about the command line and its seemingly infinite reach and power, but the fact is that you and your users can t do anything with the shell that couldn t be done in a half-dozen other ways.
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14.6 Security recommendations
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As I mentioned earlier, Microsoft recommends the use of the RemoteSigned execution policy for computers where you need to run scripts. I disagree and suggest that you consider using AllSigned. Yes, it s a bit less convenient, but you can make it more convenient by following these two recommendations:
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Commercial CAs charge up to $900 per year for a code-signing certificate. If you don t have an internal PKI that can provide a free one, you can make your own. Run help about_signing for information on obtaining and using Makecert.exe, a tool that will make a certificate that will be trusted only by your local computer. If that s the only place where you need to run scripts, it s a quick and free way to obtain a certificate. Edit scripts in one of the editors I mentioned, each of which can sign the script for you each time you save the file. That makes the signing process transparent and automatic, making it more convenient.
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As I ve already stated, I don t think you should change the .PS1 filename association. I ve seen some folks modify Windows to recognize .PS1 as an executable, meaning that you can double-click a script to run it. That takes us right back to the bad old days of VBScript, and you probably want to avoid doing that. I want to point out that none of the scripts I supply on MoreLunches.com are digitally signed. That means it s possible for those to be modified without my (or your) knowledge, so before you run any of those scripts, you need to take the time to review them, understand what they re supposed to be doing, and make sure they match what s in this book (if appropriate). I didn t sign the scripts specifically because I want you to take that time: you should be in the habit of carefully reviewing anything you download from the internet, no matter how trusted the author may seem.
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Security alert!
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14.7 Lab
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Your task in this lab is simple so simple, in fact, that I won t even post a sample solution on MoreLunches.com. I just want you to configure your shell to allow script execution. Use the Set-ExecutionPolicy cmdlet, and I suggest using the RemoteSigned policy setting. You re welcome to use AllSigned, but it will be impractical for the purposes of this book s remaining labs. You could also choose Unrestricted, but I don t ever recommend the use of that setting because it s too liberal. That said, if you re using PowerShell in a production environment, please make sure that whatever execution policy setting you choose is compatible with your organization s security rules and procedures. I don t want you getting in trouble for the sake of this book and its labs!
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