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RemoteSigned RemoteSigned requires that all scripts that are downloaded from a remote location must be Authenticode-signed before they can be executed. Note that this depends on the application doing the download to mark the script as coming from a remote location. Not all applications may do this. Anything downloaded by Internet Explorer 6.0 or above, Outlook, or Outlook Express will be properly marked. This is the minimum recommended execution policy setting. It is the best policy setting for script development. Unrestricted When the execution policy is unrestricted, PowerShell will run any script. It will still prompt the user when it encounters a script that has been downloaded however. This is the least secure setting. It is not recommend that you use this setting, but it may be necessary in some developer scenarios where RemoteSigned is still too restrictive.
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The execution policy is controlled by a registry key. Two cmdlets, Get-ExecutionPolicy and Set-ExecutionPolicy, can be used to change this key. First we ll take a look at where the information is stored in the registry. Finding the current script execution policy We ll use the registry provider to find out the current execution policy setting. First we need to cd into the area of the registry containing the PowerShell configuration.
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PS (1) > cd hklm:\software\microsoft\PowerShell PS (2) > cd "$($host.version.major)\ShellIDs\$ShellID"
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Now we ll use the Get-ItemProperty cmdlet to access the ExecutionPolicy property.
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SECURING THE POWERSHELL ENVIRONMENT
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PS (3) > Get-ItemProperty. ExecutionPolicy PSPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL _MACHINE\software\microsoft\PowerShell\1\Shell Ids\Microsoft.PowerShell PSParentPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL _MACHINE\software\microsoft\PowerShell\1\Shell Ids PSChildName : Microsoft.PowerShell PSDrive : HKLM PSProvider : Microsoft.PowerShell.Core\Registry ExecutionPolicy : Restricted
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Changing the execution policy Now let s use Set-ExecutionPolicy to change the policy to RemoteSigned.
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PS (4) > Set-ExecutionPolicy RemoteSigned
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And again use Get-ItemProperty to verify that the value has been changed.
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PS (5) > Get-ItemProperty. ExecutionPolicy PSPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL _MACHINE\software\microsoft\PowerShell\1\Shell Ids\Microsoft.PowerShell PSParentPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL _MACHINE\software\microsoft\PowerShell\1\Shell Ids PSChildName : Microsoft.PowerShell PSDrive : HKLM PSProvider : Microsoft.PowerShell.Core\Registry ExecutionPolicy : RemoteSigned
Of course, it s much easier to check it with Get-ExecutionPolicy:
PS (6) > Get-ExecutionPolicy RemoteSigned
So why did we bother looking at the registry Because it s always useful to know how things work and where they re stored. It may be that you re in a situation where you need to enable (or disable) script execution and aren t able to use an interactive PowerShell session to do it. Remember, execution policy depends heavily on the signing infrastructure to determine whether or not a script should be run. In the next section, we ll review the overall script signing architecture in Windows and look at how to sign scripts in PowerShell.
CHAPTER 1 3
SECURITY, SECURITY, SECURITY
SIGNING SCRIPTS
Signing a script is the process of adding extra information that identifies the publisher of the script in a secure way. By secure way, we mean that it is done in such a way that you can verify: that the script really was signed by the correct person. that the contents of the script haven t been changed in any way since it was signed.
How public key encryption and one-way hashing work Script signing is accomplished using two technologies: public key encryption and oneway hashes. Public key encryption is important because it uses two keys: a private key for encrypting information and a second public key for decrypting the data encrypted with the private key. The other technology we need is a one-way hash function. This is a type of function where it s easy to calculate the output for any input, but is very hard to recover the input if you have only the output. These hash functions also need to be collision resistant. In other words, it should be highly unlikely that two inputs produce the same output. Here s how these technologies are used to verify the authenticity and integrity of the script. First the script author (or publisher) calculates a one-way hash of the contents of the script using a secure hashing algorithm. This hash is then encrypted with the publisher s private key and attached to the script in the form of a comment block. The script is then delivered to the consumer who is going to run the script. Before the script is run, PowerShell removes the signature block, and then calculates its own one-way hash of the document using the same algorithm as the publisher. Using the publisher s public decryption key, PowerShell decrypts the hash contained in the signature comment block. Finally, it compares the hash it calculated against the one that was recovered from the signature block. If they match, the script was created by the owner of the private key and hasn t been tampered with. If they don t match, the script is rejected. It s either not legitimately signed by the publisher or it has been tampered with. There is one small thing that we ve skipped in this discussion. How do we get the right public key to decrypt the signature in the first place Calling up the publisher on the telephone every time we run the script is not going to work. This is where signing authorities and certificates come in. First we ll look the role of a signing authority in creating certificates. Then we ll talk about how we can create our own self-signed certificates. This is a two stage process: creating a local signing authority and then using that authority to issue a certificate.
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