Collecting and Storing Lenovo Warranty
Information to Azure Monitor

A feature add (by popular demand) in Commercial Vantage is the ability to write the device's warranty information to WMI.

The Lenovo_WarrantyInformation WMI class located under the root\Lenovo Namespace is created when the Write Warranty Information to WMI policy has been enabled on the device.

In this post, we're going to walk through how this data can be collected from Intune managed devices and ingested into a Log Analytics Workspace in Azure Monitor.

The solution is derived from an excellent Microsoft blog post, which provides an example of collecting BIOS information. Admittedly, I haven't explored the depths of Graph and was surprised to read that script outputs are stored in a resultMessage property on the service side, as noted in the post.

Once I got the grasp of the workflow, I thought why not try and go after warranty information? Stepping outside of my comfort zone, I decided to take this a bit further by delving into Log Analytics and Azure Automation to automate the collection of this data using a scheduled Runbook. Fortunately, the MS docs have been incredibly helpful during my testing.

Before you begin, make sure your test devices have the latest version of Commercial Vantage installed and the GPO to write warranty information to WMI has been configured. Refer to this blog post on how to deploy the setting with Intune or you can configure it manually using the provided .Admx template loaded into the local Group Policy Editor. You can verify data has been written to WMI by browsing to the namespace using WMIExplorer.

Deploy this PowerShell script to a user/device group to get started

Get-CimInstance -Namespace root/Lenovo -ClassName Lenovo_WarrantyInformation | Select-Object `
    SerialNumber, `
    Product, `
    StartDate, `
    EndDate, `
    LastUpdateTime | ConvertTo-Json

Once you're starting to see script execution has succeeded on your devices in the MEM admin center, access the data via Graph as demonstrated in the blog post referenced earlier.

Here's an example of what you should expect to see in Graph Explorer.

Now that we have data, we're going to send this to the Azure Monitor HTTP Data Collector API using PowerShell. You'll need to note the Workspace ID and Primary Key of the Log Analytics workspace you intend on using.

You can find this information under Log Analytics workspace > Agents management

Next, we're going to setup a PowerShell Runbook that will create a POST request to the HTTP Data Collector API that includes our list of devices to send.

Prerequisites

Azure Automation account. If you haven't created one, refer to the MS doc on how to do this.

Intune PowerShell SDK, which provides support for the Intune API through Graph. This module will need to be imported from the PowerShell Gallery into Azure Automation before proceeding. Here's a short script to do so:

$ResourceGroup = '<your resource group>'
$AutomationAccount = '<your automation account>'

# URL to Graph package: https://www.powershellgallery.com/packages/Microsoft.Graph.Intune
if (!(Get-AzAutomationModule -ResourceGroupName $ResourceGroup -AutomationAccountName $AutomationAccount | Where-Object { $_.Name -eq $ModuleName -and $_.ProvisioningState -eq 'Succeeded' })) {
    New-AzAutomationModule -Name $ModuleName -ResourceGroupName $ResourceGroup -AutomationAccountName $AutomationAccount -ContentLinkUri 'https://www.powershellgallery.com/api/v2/package/Microsoft.Graph.Intune/6.1907.1.0'
}

Verify the module's status shows Available

Two Azure Automation string type variables that will hold an Azure user account/encrypted password to authenticate to Graph (make sure this account has the appropriate permissions). These will be called using the Get-AutomationVariable internal cmdlets.

Once everything is ready to go, choose the Azure Automation account you want to use and click Runbooks and Create a runbook. Enter a name and choose PowerShell for the runbook type.

I've adjusted the PowerShell sample to include the JSON data that will be ingested to the Log Analytics Workspace. You'll need to replace the $CustomerId and $SharedKey variables with your Workspace ID and Primary Key. I've also set the $LogType variable to WarrantyInformation as this will be the name of the Custom Log that's created to store exactly what we're collecting, warranty information.

Copy/paste the below script to your runbook

<#
Set internal automation cmdlets for Graph authentication
Reference: https://docs.microsoft.com/en-us/azure/automation/shared-resources/variables?tabs=azure-powershell#internal-cmdlets-to-access-variables
#>
$AdminUser = Get-AutomationVariable -Name 'AdminUser'
$AdminPassword = Get-AutomationVariable -Name 'AdminPassword'
$SecureAdminPassword = ConvertTo-SecureString -String $AdminPassword -AsPlainText -Force
$Cred = New-Object System.Management.Automation.PSCredential ($AdminUser, $SecureAdminPassword)

# Connect to Graph Beta API
Update-MSGraphEnvironment -SchemaVersion 'beta'
Connect-MSGraph -PSCredential $Cred | Out-Null

<# 
Gather warranty info from successful script executions
Reference: https://techcommunity.microsoft.com/t5/device-management-in-microsoft/how-to-collect-custom-inventory-from-azure-ad-joined-devices/ba-p/2280850#.YIGt2nOrV50.linkedin
#>
$result = Invoke-MSGraphRequest -HttpMethod GET -Url 'deviceManagement/deviceManagementScripts/<script id>/deviceRunStates?$expand=managedDevice' | Get-MSGraphAllPages
$success = $result | Where-Object -Property errorCode -EQ 0
$resultMessage = $success.resultMessage 
$Devices = $resultMessage | ConvertFrom-Json
$newjson = $Devices | ConvertTo-Json

<#
Below sample request reference:
https://docs.microsoft.com/en-au/azure/azure-monitor/logs/data-collector-api?WT.mc_id=EM-MVP-5002871&ranMID=24542&ranEAID=je6NUbpObpQ&ranSiteID=je6NUbpObpQ-Kk7A3ox8I8XgrRn0d4uDfA&epi=je6NUbpObpQ-Kk7A3ox8I8XgrRn0d4uDfA&irgwc=1&OCID=AID2000142_aff_7593_1243925&tduid=(ir__nxnprvrvwwkfq3kekk0sohzncu2xuln0dh1bwc9k00)(7593)(1243925)(je6NUbpObpQ-Kk7A3ox8I8XgrRn0d4uDfA)()&irclickid=_nxnprvrvwwkfq3kekk0sohzncu2xuln0dh1bwc9k00#sample-requests
#>

# Replace with your Workspace ID
$CustomerId = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"  

# Replace with your Primary Key
$SharedKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

# Specify the name of the record type that you'll be creating
$LogType = "WarrantyInformation"

# You can use an optional field to specify the timestamp from the data. If the time field is not specified, Azure Monitor assumes the time is the message ingestion time
$TimeStampField = ""

# Create the function to create the authorization signature
Function Build-Signature ($customerId, $sharedKey, $date, $contentLength, $method, $contentType, $resource)
{
    $xHeaders = "x-ms-date:" + $date
    $stringToHash = $method + "`n" + $contentLength + "`n" + $contentType + "`n" + $xHeaders + "`n" + $resource

    $bytesToHash = [Text.Encoding]::UTF8.GetBytes($stringToHash)
    $keyBytes = [Convert]::FromBase64String($sharedKey)

    $sha256 = New-Object System.Security.Cryptography.HMACSHA256
    $sha256.Key = $keyBytes
    $calculatedHash = $sha256.ComputeHash($bytesToHash)
    $encodedHash = [Convert]::ToBase64String($calculatedHash)
    $authorization = 'SharedKey {0}:{1}' -f $customerId,$encodedHash
    return $authorization
}


# Create the function to create and post the request
Function Post-LogAnalyticsData($customerId, $sharedKey, $body, $logType)
{
    $method = "POST"
    $contentType = "application/json"
    $resource = "/api/logs"
    $rfc1123date = [DateTime]::UtcNow.ToString("r")
    $contentLength = $body.Length
    $signature = Build-Signature `
        -customerId $customerId `
        -sharedKey $sharedKey `
        -date $rfc1123date `
        -contentLength $contentLength `
        -method $method `
        -contentType $contentType `
        -resource $resource
    $uri = "https://" + $customerId + ".ods.opinsights.azure.com" + $resource + "?api-version=2016-04-01"

    $headers = @{
        "Authorization" = $signature;
        "Log-Type" = $logType;
        "x-ms-date" = $rfc1123date;
        "time-generated-field" = $TimeStampField;
    }

    $response = Invoke-WebRequest -Uri $uri -Method $method -ContentType $contentType -Headers $headers -Body $body -UseBasicParsing
    return $response.StatusCode

}

# Submit the data to the API endpoint
Post-LogAnalyticsData -customerId $customerId -sharedKey $sharedKey -body ([System.Text.Encoding]::UTF8.GetBytes($newjson)) -logType $logType

Click on Test pane and click on Start. After a few seconds, you should see Complete

Let's check out the new Custom Log in our workspace. Click the Custom logs blade. There should now be a WarrantyInformation_CL visible. Notice the type is Ingestion API.

Head over to the Azure Monitor Logs and run the following query to see our devices.

WarrantyInformation_CL
| order by Product_s
| distinct Product_s, StartDate_s, EndDate_s

Yay! Warranty data!

If you don't need to make any further changes with the Runbook, click on Publish.

Another example would be if you wanted to only show devices whose Warranty ended in the year 2020, you could run this query

WarrantyInformation_CL
| distinct SerialNumber_s, Product_s, StartDate_s, EndDate_s
| where EndDate_s contains "2020"

You can also pin a specific query to your dashboard if you desire

Now we can set up a recurring schedule for the Runbook to monitor our fleet's warranty.