Remotely setting network credentials using cmdkey

https://powershell.org/forums/topic/remotely-setting-network-credentials-using-cmdkey/

I have a task to automate the build on Azure VM with custom extension scripts. One of the tasks of the custom extension scripts is to map network drives [and save its credentials]. The custom extension scripts are automatically executed by Azure using the ADMIN user id. This causes problems as the mapped network drive resides in a different user domain. As a consequence, I have to create another script [map.ps1] which does the mapping and have it invoked from a wrapper script [deploy.ps1].

Please note snippets of my script:

deploy.ps1

$storageCred=”A long string of name value pairs containing the network user id and password”
$domainAdminUserId = “xxxx/yyyy”
$domainAdminPassword = ( ‘zzzz’ | ConvertTo-SecureString -AsPlainText -Force )
$domainAdminCredentials = New-Object -typename System.Management.Automation.PSCredential -argumentlist $domainAdminUserId, $domainAdminPassword

Enable-PSRemoting -Force
Invoke-Command -ComputerName localhost -FilePath “C:\FTPFiles\map.ps1” -Credential $domainAdminCredentials -ArgumentList $storageCred -Verbose

Map.ps1

$storageCredArray = $storageCred.Split(‘~’)
$storageCredLookupTable = ConvertFrom-StringData ($storageCredArray | out-string)

Write-Host ‘Mapping file shares – started’ -ForegroundColor Green
$driveLetterAscii = [Byte][char]’X’

foreach ($usr in $storageCredLookupTable.Keys) {
$driveLetter = [Char][byte]$driveLetterAscii
CMDKEY /add:$usr.file.core.windows.net /user:$env:COMPUTERNAME\$usr /pass:($storageCredLookupTable.Item($usr))
Net Use ($driveLetter + “:”) “\\$usr.file.core.windows.net\share” /SAVECRED /PERSISTENT:YES
if (Test-Path ($driveLetter + “:\Interfaces”)) {
Write-Host “$driveLetter mapped to $usr.file.core.windows.net\share successfully” -ForegroundColor Green
} else {
Write-Host “Failure in mapping $driveLetter to $usr.file.core.windows.net\share” -ForegroundColor Red
}
++$driveLetterAscii
}

When I run this, it errors while adding the network credentials [cmdkey /add]. I get the following error:

CMDKEY: Credentials cannot be saved from this logon session

Any help on this is much appreciated.

That’s a limitation of the Cmdkey command – not really a PowerShell thing. But it’s related to the way Remotig handles credentials. The remote session doesn’t actually get a credential, it gets a delegated ticket, so there’s no token to actually save. That’s all by design, and not something you can reconfigure.

 

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