Extend AAD Service Principal Client Secret Expiration

Occasionally you may be alerted to an existing Azure AD service principal whose client secret is scheduled to expire soon. From the Azure AD portal -> Application Registrations -> App -> Certificates & Secrets blade it is not possible to extend the expiration of an existing secret. You can only create a new one.

This can be a problem because the portal auto-generates the secret to be a random value. So you would have to go and update all your application code\configs to use this new secret value.

Luckily, with Azure PowerShell module you can both create a new secret with the same value as your existing one and set it’s expiration date manually preventing any unnecessary work to update application code\configs.

Example Script:

# Get service principal
$sp = Get-AzADServicePrincipal -DisplayName "MyTestApp"

# View current password Ids and expirations
Get-AzADSpCredential -ObjectId $sp.Id

#choose expiration date
$start = get-date
$end = $start.AddYears(150)

#Set same password as current password
$SecureStringPassword = ConvertTo-SecureString -String "c0[Ndh_@G/j8tB4aqbq66R]P*0MVwB.h" -AsPlainText -Force
New-AzADAppCredential -ApplicationId $sp.ApplicationId -StartDate $start -EndDate $end -Password $SecureStringPassword

# Verify new credential expiration
Get-AzADAppCredential -ApplicationId $sp.ApplicationId

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