Azure Key Vault Secret

22.1.17

Azure Key Vault makes it possible to securely store a String (or PowerShell Script) behind Azure Active Directory (Azure AD) authentication.

Azure Key Vault Secret RBAC Roles

There are two RBAC roles that are needed, depending if you need Read or Read/Write access to Azure Key Vault

Key Vault Secrets Reader
Read secret contents.
Only works for key vaults that use the 'Azure role-based access control' permission model.

Key Vault Secrets Officer
Perform any action on the secrets of a key vault, except manage permissions.
Only works for key vaults that use the 'Azure role-based access control' permission model.

PowerShell Modules

The following PowerShell Modules will be needed for Creating and Reading an Azure Key Vault Secret

Az.Accounts
Az.KeyVault

Set-AzKeyVaultSecret

For this task, I decided to use Invoke-RestMethod to read a GitHub Gist as my string

$VaultName = 'PSCloudScript'
$Name = 'KeyVaultSecretTest'
$Uri = 'https://gist.githubusercontent.com/OSDeploy/5754963498d77bc254fbe1436af3cb7d/raw/Test-PSCloudScriptAzKeyVaultSecret.ps1'
$RawString = Invoke-RestMethod -Uri $Uri
$SecretValue = ConvertTo-SecureString -String $RawString -AsPlainText -Force
Set-AzKeyVaultSecret -VaultName $VaultName -Name $Name -SecretValue $SecretValue

Once this was complete, I verified in Azure Portal that my Key Vault Secret was created. I also pressed the 'Show Secret Value' button and verified that my full script was saved as a Secret

Get-AzKeyVaultSecret

I tested reading the Key Vault Secret with my Tech account and using Get-AzKeyVaultSecret returned the Key Vault Secret Object

To view the Secret, I added the -AddPlainText parameter which returned the PowerShell script. Finally I tested passing this to Invoke-Expression to get the PowerShell script I saved executed