Obs/bin/ObsDep/content/Powershell/Roles/Common/AzureStackPXE.psm1

<###################################################
 # #
 # Copyright (c) Microsoft. All rights reserved. #
 # #
 ##################################################>


Import-Module NetSecurity

# Installs the AzureStackPXE service on the local machine
function Install-AzureStackPXE {
    Param(
        [Parameter(Mandatory = $true)]
        $logFile,

        [Parameter(Mandatory = $true)]
        $configurationFile,
        
        [Parameter(Mandatory = $false)]
        $idempotent
    )
    $ErrorActionPreference = "Stop"

    $serviceName = "AzureStackPXE"

    # Get the path to where the Network Boot Server binaries are unpacked
    $binaryPath = Join-Path "$env:SystemDrive\CloudDeployment" "NetworkBootServer"

    # Setup the Network Boot Server service, but don't start it just yet
    $service = Get-Service -Name $serviceName -ErrorAction Ignore

    # Remove the service if it already exists (unless this is an idempotent run)
    if ($service -ne $null -and $idempotent -eq $false) {
        # Stop service before attempting to remove it
        Write-Verbose "$serviceName service already exists, stopping and removing"
        Stop-Service -Name $serviceName -ErrorAction Ignore
        & "sc.exe" "delete" "$serviceName"
    }

    try {
        # Setup the service if this is not an idempotent run, or if the service didn't previously exist
        if ($service -eq $null -or $idempotent -eq $false) {
            Write-Verbose "Installing service $serviceName"
            New-Service -Name $serviceName -BinaryPathName "$binaryPath\NetworkBootServer.exe -log:$logFile -config:$configurationFile" -DisplayName "Azure Stack Network Boot Server" -StartupType Manual

            # Restart the service for first, second and subsequent failures after 5000 milliseconds. Reset after 1 day.
            Write-Verbose "Configuring recovery mechanism for Azure Stack Network Boot Service: '$serviceName'"
            $out = sc.exe failure $serviceName actions=restart/5000/restart/5000/restart/5000/5000 reset=86400
            if ($LASTEXITCODE -ne 0)
            {
                Write-Error "[LASTEXITCODE: '$LASTEXITCODE']`n[sc.exe failure $serviceName actions=restart/5000/restart/5000/restart/5000/5000 reset=86400]:`n $($out | Out-String)"
            }
            else
            {
                Write-Verbose "[sc.exe failure $serviceName actions=restart/5000/restart/5000/restart/5000/5000 reset=86400]:`n $($out | Out-String)"
            }

            # Log the recovery settings
            $out = sc.exe qfailure $serviceName
            if ($LASTEXITCODE -ne 0)
            {
                Write-Error "[LASTEXITCODE: '$LASTEXITCODE']`n[sc.exe qfailure $serviceName]:`n $($out | Out-String)"
            }
            else
            {
                Write-Verbose "[sc.exe qfailure $serviceName]:`n $($out | Out-String)"
            }
        }
    }
    catch {
        throw "Could not create $serviceName service ($_)"
    }
}

# Configures firewall rules for the AzureStackPXE service on the local machine
function Set-AzureStackPXEFirewallRules {
    $ErrorActionPreference = "Stop"

    # The firewall service needs to be started for this to work
    $firewallServiceName = "MpsSvc"
    $firewallService = Get-Service -Name $firewallServiceName -ErrorAction Ignore

    # Exit if the firewall service could not be found
    if ($firewallService -eq $null) {
        Write-Verbose "Could not locate the firewall service, exiting"
        return
    }

    # Save initial state of the firewall service, we want to leave it in the same state on exit
    $firewallServiceStatus = $firewallService.Status

    # Start service if not already running
    if ($firewallServiceStatus -ne "Running") {
        Write-Verbose "Firewall service is stopped, starting temporarily so we can apply rules."
        Start-Service -Name $firewallService -ErrorAction Ignore
    }

    # Remove existing firewall rules. These are relatively inexpensive operations, so we can remove and re-add on idempotent runs
    Get-NetFirewallRule -Name "AzureStackPXE_DHCP_Inbound" -ErrorAction Ignore | Remove-NetFirewallRule -ErrorAction Ignore 
    Get-NetFirewallRule -Name "AzureStackPXE_TFTP_Inbound" -ErrorAction Ignore | Remove-NetFirewallRule -ErrorAction Ignore 
    Get-NetFirewallRule -Name "AzureStackPXE_DHCP_Outbound" -ErrorAction Ignore | Remove-NetFirewallRule -ErrorAction Ignore 
    Get-NetFirewallRule -Name "AzureStackPXE_TFTP_Outbound" -ErrorAction Ignore | Remove-NetFirewallRule -ErrorAction Ignore 

    # Allow inbound DHCP traffic to ports 67 and 4011 from remote ports 67, 68 and 4011
    New-NetFirewallRule -Direction In -Name "AzureStackPXE_DHCP_Inbound" -DisplayName "Azure Stack Network Boot Server DHCP (Inbound)" -Protocol UDP -LocalPort 67, 4011 -RemotePort 67, 68, 4011 | Out-Null
    
    # Allow inbound TFTP traffic to port 69 from any remote port
    New-NetFirewallRule -Direction In -Name "AzureStackPXE_TFTP_Inbound" -DisplayName "Azure Stack Network Boot Server TFTP (Inbound)" -Protocol UDP -LocalPort 69 | Out-Null
    
    # Allow outbound DHCP traffic only from the AzureStackPXE service (local ports 67 and 4011) to remote ports 67, 68 and 4011
    New-NetFirewallRule -Direction Out -Name "AzureStackPXE_DHCP_Outbound" -DisplayName "Azure Stack Network Boot Server DHCP (Outbound)" -Protocol UDP -LocalPort 67, 4011 -RemotePort 67, 68, 4011 -Service "AzureStackPXE" | Out-Null

    # Allow outbound TFTP traffic only from the AzureStackPXE service (local port 69) to any remote port
    New-NetFirewallRule -Direction Out -Name "AzureStackPXE_TFTP_Outbound" -DisplayName "Azure Stack Network Boot Server TFTP (Outbound)" -Protocol UDP -LocalPort 69 -Service "AzureStackPXE" | Out-Null

    # Restore firewall service to its initial state
    if ($firewallServiceStatus -eq "Stopped") {
        Write-Verbose "Stopping firewall service."
        Stop-Service -Name $firewallService -ErrorAction Ignore
    }
}

# Loads the AzureStackPXEConfiguration object from the specified JSON file
function Get-AzureStackPXEConfiguration {
    Param(
        [Parameter(Mandatory = $true)]
        $configurationFile
    )

    $json = Get-Content -Path $configurationFile
    return CreateAzureStackPXEConfiguration($json)
}

# Creates a new (empty) AzureStackPXEConfiguration object
function New-AzureStackPXEConfiguration {
    $config = CreateAzureStackPXEConfiguration -json $null
    return $config
}

# Loads the specified AzureStackPXE assembly
function Use-AzureStackPXEAssembly {
    Param(
        [Parameter(Mandatory = $true)]
        $Type
    )

    $binaryPath = Join-Path "$env:SystemDrive\CloudDeployment" "NetworkBootServer"
    if(!(Test-Path $binaryPath))
    {
      $binaryPath = Join-Path "$PSScriptRoot\..\..\" "NetworkBootServer"
    }
    $binaryPath = Join-Path $binaryPath "$Type.dll"

    try {
        Write-Verbose "Loading assembly $binaryPath"
        Add-Type -Path $binaryPath | Out-Null
    }
    catch {
        throw "Failed to load assembly $binaryPath ($_)"
    }
}

# Creates a PXE configuration object and deserializes its contents from JSON if specified
function CreateAzureStackPXEConfiguration {
    Param(
        [Parameter(Mandatory = $false)]
        $json
    )

    # Deserialize configuration object from JSON if specified, or create a new instance otherwise
    if ($json -ne $null) {
        $pxeConfig = [Microsoft.AzureStack.Solution.Deploy.AzureStackPXE.Common.PXEServerConfiguration]::Deserialize($json)
        
        # Deserialization should throw an exception on failure, adding a null check for safety
        if ($pxeConfig -eq $null) {
            throw "Failed to deserialize AzureStackPXE configuration"
        }
        
        return $pxeConfig
    }
    else {
        $typeName = "Microsoft.AzureStack.Solution.Deploy.AzureStackPXE.Common.PXEServerConfiguration"
        Write-Verbose "Creating new instance of $typeName"
        $pxeConfig = New-Object -TypeName $typeName
        
        if ($pxeConfig -eq $null) {
            throw "Failed to create instance of $typeName"
        }

        return $pxeConfig
    }
}

# Creates a new instance of Microsoft.AzureStack.Solution.Deploy.AzureStackPXE.Common.PXEClient, for the purpose of adding
# it to a Configuration object. The client is an in-memory instance and is not sent to the REST endpoint of the service
function New-AzureStackPXEClientInstance {
    Param(
        [Parameter(Mandatory = $true)]
        $ClientIdentifier,

        [Parameter(Mandatory = $true)]
        $BootBehavior,

        [Parameter(Mandatory = $true)]
        $SetToDefaultAfterBoot
    )
    
    # Create instance of PXEClient
    $pxeClient = New-Object -TypeName "Microsoft.AzureStack.Solution.Deploy.AzureStackPXE.Common.PXEClient"
    $pxeClient.ClientIdentifier = $ClientIdentifier
    $pxeClient.BootBehavior = $BootBehavior
    $pxeClient.SetToDefaultAfterBoot = $SetToDefaultAfterBoot

    return $pxeClient
}

# Builds a HTTP URI for the specified server and port
function GetRESTEndpoint {
    Param(
        [Parameter(Mandatory = $false)]
        $PxeServer = "localhost",

        [Parameter(Mandatory = $false)]
        $Port = 9000,

        [Parameter(Mandatory = $false)]
        $Api = "pxe"
    )

    return "http://$PxeServer" + ":" + "$Port/$Api"
}

# Uses the AzureStackPXE REST API to get all clients known to the boot server
function Get-AzureStackPXEClients {
    Param(
        [Parameter(Mandatory = $false)]
        $PxeServer = "localhost"
    )
    $ErrorActionPreference = "Stop"

    try {
        $uri = GetRESTEndpoint -PxeServer $PxeServer
        $clients = (Invoke-WebRequest -Uri "$uri/pxeclient" -Method Get -TimeoutSec 60 -UseBasicParsing -UseDefaultCredentials -Verbose -ErrorAction Stop).Content | ConvertFrom-Json
        return $clients
    }
    catch {
        throw "Failed to get PXE clients ($_)"
    }
}


# Uses the AzureStackPXE REST API to set the properties of a PXE client
function Set-AzureStackPXEClient {
    Param(
        [Parameter(Mandatory = $true)]
        $ClientIdentifier,

        [Parameter(Mandatory = $true)]
        $BootBehavior,

        [Parameter(Mandatory = $true)]
        $SetToDefaultAfterBoot,

        [Parameter(Mandatory = $false)]
        $PxeServer = "localhost"
    )
    $ErrorActionPreference = "Stop"

    try {
        $uri = GetRESTEndpoint -PxeServer $PxeServer
        
        $json = @{
            clientIdentifier = $ClientIdentifier
            bootBehavior = $BootBehavior
            setToDefaultAfterBoot = $SetToDefaultAfterBoot
        } | ConvertTo-Json

        Invoke-WebRequest -Uri "$uri/pxeclient" -Method Put -Body $json -ContentType "application/json" -UseBasicParsing -UseDefaultCredentials -Verbose
        Write-Verbose "PXE client $ClientIdentifier updated successfully"
    }
    catch {
        throw "Failed to update PXE client $ClientIdentifier ($_)"
    }
}

# Uses the AzureStackPXE REST API to add a PXE client to the known clients list
function New-AzureStackPXEClient {
    Param(
        [Parameter(Mandatory = $true)]
        $ClientIdentifier,

        [Parameter(Mandatory = $true)]
        $BootBehavior,

        [Parameter(Mandatory = $true)]
        $SetToDefaultAfterBoot,

        [Parameter(Mandatory = $false)]
        $PxeServer = "localhost"
    )
    $ErrorActionPreference = "Stop"

    try {
        $uri = GetRESTEndpoint -PxeServer $PxeServer
        
        $json = @{
            clientIdentifier = $ClientIdentifier
            bootBehavior = $BootBehavior
            setToDefaultAfterBoot = $SetToDefaultAfterBoot
        } | ConvertTo-Json

        Invoke-WebRequest -Uri "$uri/pxeclient" -Method Post -Body $json -ContentType "application/json" -UseBasicParsing -UseDefaultCredentials -Verbose
        Write-Verbose "PXE client $ClientIdentifier created successfully"
    }
    catch {
        throw "Failed to create PXE client $ClientIdentifier ($_)"
    }
}

# Tests whether the AzureStackPXE service has been installed and all BareMetal nodes setup for PXE boot
function Test-AzureStackPxeDeployed {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [CloudEngine.Configurations.EceInterfaceParameters]
        $Parameters
    )

    $ErrorActionPreference = [System.Management.Automation.ActionPreference]::Stop

    # Get physical nodes from BaseMetal role
    $physicalMachinesRole = $Parameters.Roles["BareMetal"].PublicConfiguration
    $serviceName = "AzureStackPXE"

    # Cloud Role
    $cloudRole = $Parameters.Roles['Cloud'].PublicConfiguration

    # OEM Model info
    $OEMRole = $Parameters.Roles["OEM"].PublicConfiguration
    $OEMModel = $OEMRole.PublicInfo.UpdatePackageManifest.UpdateInfo.Model

    # Account info
    $securityInfo = $cloudRole.PublicInfo.SecurityInfo
    $bareMetalUser = $securityInfo.HardwareUsers.User | Where-Object -Property Role -EQ 'BareMetalAdmin'
    $bareMetalCredential = $Parameters.GetCredential($bareMetalUser.Credential)

    # Check that the PXE service has been installed and is currently running
    if ((Get-Service $serviceName -ErrorAction SilentlyContinue).Status -eq "Running") {
        # Use AzureStackPXE REST API to get a list of PXE clients
        Write-Verbose "Getting a list of known PXE clients."
        $existingPxeClients = Get-AzureStackPXEClients
        
        foreach ($node in $physicalMachinesRole.Nodes.Node) {
            # Check that the node is setup for PXE boot by MAC address or machine id
            $nodeSetupForPxe = $false

            if([string]::IsNullOrEmpty($node.MacAddress))
            {
                # Determine the machine UUID from the BMC
                $currentClientIdentifier = Get-SmBiosGuid -BmcIP $node.BmcIPAddress -Credential $bareMetalCredential -OEMModel $OEMModel -OOBProtocol $node.OOBProtocol -NodeInstance $node.NodeInstance -NodeName $node.Name
                $currentClientIdentifier=$device.guid.Replace("-","")
            }
            else
            {
                $currentClientIdentifier = $node.MacAddress
            }
            foreach ($existingPxeClient in $existingPxeClients) {
                if ($existingPxeClient.ClientIdentifier -eq $currentClientIdentifier) {
                    Write-Verbose "Node $($node.Name) $currentClientIdentifier has already been setup for PXE boot."
                    $nodeSetupForPxe = $true
                    break
                }
            }

            # At least one node has not been setup for PXE, return 'false'
            if ($nodeSetupForPxe -eq $false) {
                Write-Verbose "Node $($node.Name) $currentClientIdentifier has not been setup for PXE boot."    
                return $false
            }           
        }

        # All nodes have been setup for PXE, return 'true'
        return $true
    }

    # AzureStackPXE service not installed, or not running - return 'false'
    return $false
}

function Update-AzureStackPxeBootImage {
    Param(
        [Parameter(Mandatory = $true)]
        $BootImage,

        [Parameter(Mandatory = $false)]
        [Boolean] $Force = $true
    )
    $ErrorActionPreference = "Stop"

    # Create RemoteInstall folder if it doesn't exist
    $remoteInstallFolderPath = "$env:SystemDrive\RemoteInstall"
    if ((Test-Path $remoteInstallFolderPath) -eq $false) {
        $null = mkdir $remoteInstallFolderPath -Force          
    }
    
    # Create RemoteInstall\x64\Images folder if it doesn't exist
    $remoteInstallImagesFolderPath = "$remoteInstallFolderPath\Boot\x64\Images"
    if ((Test-Path $remoteInstallImagesFolderPath) -eq $false) {
        $null = mkdir $remoteInstallImagesFolderPath -Force  
    }

    # Make a copy of the WIM image to RemoteInstall\Images. Make sure the image is named "boot.wim", as this is
    # how the BCD file references it
    $bootImageLocalPath = "$remoteInstallFolderPath\Boot\x64\Images\boot.wim"
    Write-Verbose "Copying updated PXE server boot image from $BootImage to $bootImageLocalPath"

    if ((Test-Path $bootImageLocalPath) -eq $false -or $Force) {
        Write-Verbose "Copying $BootImage to local file $bootImageLocalPath."
        Copy-Item -Path $BootImage -Destination "$bootImageLocalPath" -Force
    }
    else {
        Write-Verbose "Skip copying boot image $BootImage locally, as it already exists as $bootImageLocalPath."
    }
}

# Uses the AzureStackPXE REST API to create a DHCP client reservation
function New-AzureStackDHCPReservation {
    Param(
        [Parameter(Mandatory = $true)]
        $ClientIdentifier,

        [Parameter(Mandatory = $true)]
        $IPAddress,

        [Parameter(Mandatory = $false)]
        $DhcpServer = "localhost"
    )
    $ErrorActionPreference = "Stop"

    try {
        $uri = GetRESTEndpoint -PxeServer $DhcpServer -Api "pxe"
        
        $json = @{
            MAC = $ClientIdentifier
            IP = $IPAddress
        } | ConvertTo-Json

        Invoke-WebRequest -Uri "$uri/dhcpclient" -Method Post -Body $json -ContentType "application/json" -UseBasicParsing -UseDefaultCredentials -Verbose
        Write-Verbose "DHCP reservation $ClientIdentifier -> $IPAddress created successfully"
    }
    catch {
        throw "Failed to create DHCP reservation for client $ClientIdentifier ($_)"
    }
}

# Uses the AzureStackPXE REST API to remove an existing DHCP client reservation
function Remove-AzureStackDHCPReservation {
    Param(
        [Parameter(Mandatory = $true)]
        $ClientIdentifier,

        [Parameter(Mandatory = $false)]
        $DhcpServer = "localhost"
    )
    $ErrorActionPreference = "Stop"

    try {
        $uri = GetRESTEndpoint -PxeServer $DhcpServer -Api "pxe"
        
        Invoke-WebRequest -Uri "$uri/dhcpclient?id=$ClientIdentifier" -Method Delete -ContentType "application/json" -UseBasicParsing -UseDefaultCredentials -Verbose
        Write-Verbose "DHCP reservation for client $ClientIdentifier removed successfully"
    }
    catch {
        throw "Failed to remove DHCP reservation for client $ClientIdentifier ($_)"
    }
}

# Generates a random password with the specified minimum and maximum length
function Create-RandomPassword {
    param(
        [Parameter(Mandatory=$false)]
        [int] $Minlength = 14,

        [Parameter(Mandatory=$false)]
        [int] $Maxlength = 18
    )

    $ErrorActionPreference = 'Stop'

    $lowerCaseLetters = 'abcdefghkmnprstuvwxyz'
    $upperCaseLetters = 'ABCDEFGHKLMNPRSTUVWXY'
    $numbers = '1234567890'
    $specialCharacters = '!-_#'
    $allCharacters = $lowerCaseLetters + $upperCaseLetters + $numbers + $specialCharacters

    $randomLower = Get-Random -Maximum $lowerCaseLetters.length
    $randomUpper = Get-Random -Maximum $upperCaseLetters.length
    $randomNumber = Get-Random -Maximum $numbers.length
    $randomSpecial = Get-Random -Maximum $specialCharacters.length

    $password = @()

    if($MinLength -lt 7)
    {
        throw "MinLength cannot be less than 7."   
    }
        
    $maxLength = $Maxlength - 3
    $minLength = $MinLength - 4

    $passwordLength = Get-Random -Minimum $Minlength -Maximum $maxlength

    $randomAllArray = 1 ..$passwordLength | ForEach-Object { Get-Random -Maximum $allCharacters.length }

    $password += $allCharacters[$randomAllArray]

    # Guarantee at least one of each type is used.
    $password += $lowerCaseLetters[$randomLower]
    $password += $upperCaseLetters[$randomUpper]
    $password += $numbers[$randomNumber]
    $password += $specialCharacters[$randomSpecial]

    # Sort so that all the guaranteed values are not at the end.
    $sortedPassword = $password | Sort-Object { Get-Random }

    $stringPassword = $sortedPassword -Join ''

    ConvertTo-SecureString -String $stringPassword -AsPlainText -Force
}

# Get SmBios Guid from BMC IP Address.
function Get-SmBiosGuid
{
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory=$true)]
        [string]
        $BmcIP,

        [Parameter(Mandatory = $true)]
        [PSCredential]
        $Credential,

        [Parameter(Mandatory=$true)]
        [string]
        $OEMModel,

        [Parameter(Mandatory=$false)]
        [string]
        $NodeName,

        [Parameter(Mandatory=$false)]
        [string]
        $NodeInstance,

        [Parameter(Mandatory=$false)]
        [string]
        $OOBProtocol
    )

    $ErrorActionPreference = 'Stop'

    if ($OEMModel -notmatch "Hyper-V")
    {
        $paramHash = @{}

        if ($OOBProtocol)
        {
            $paramHash += @{ OOBProtocol = $OOBProtocol }
        }

        if ($NodeInstance)
        {
            $paramHash += @{ NodeInstance = $NodeInstance }
        }

        Import-Module -Name "$PSScriptRoot\..\..\OOBManagement\bin\Microsoft.AzureStack.OOBManagement.dll" -Force
        Import-Module -Name "$PSScriptRoot\..\..\OOBManagement\bin\Newtonsoft.Json.dll" -Force

        # Retrieve the machine UUID from the BMC
        $device = Get-IpmiDeviceSystemGuid -TargetAddress $BmcIP -Credential $Credential @paramHash
    }
    else
    {

        ### Temporary fix - only for virutal environments, remove the change after the fix of bug: 2363555
        Trace-Execution "Adding trusted host entry "
        Set-Item WSMan:\localhost\Client\TrustedHosts -Value "*" -Force
        ###

        $device = Invoke-Command -ComputerName $BmcIP -Credential $Credential -ArgumentList $NodeName -ErrorAction Stop -ScriptBlock {
            param($NodeName)
            $hostVm = Get-VM $NodeName

            Trace-Execution "Retrieved the VM $hostVm, getting the VMManagementServiceInstance"

            $vmId = $hostVm.VMId
            $VMManagementServiceInstance = Get-CimInstance  -ClassName "Msvm_VirtualSystemManagementService" -Namespace "root\virtualization\v2"
            Trace-Execution "Retrieved VMManagementServiceInstance, Getting the CimInstance of the VM"
            $vmInstance = Get-CimInstance -ClassName Msvm_ComputerSystem -Namespace "root\virtualization\v2" | where { $_.Name -like $vmId }
            Trace-Execution "Retrieved the VM CimInstance, Getting the VMSettingData"
            $VMSettingData = Get-CimAssociatedInstance -InputObject $vmInstance -ResultClassName "Msvm_VirtualSystemSettingData" -Association "Msvm_SettingsDefineState"

            Trace-Execution "Retrieved the VMSettingData, now aggregating and returning SmBios information"
                  
            [System.Guid]::Parse($VMSettingData.BIOSGUID)

         } 
    }

    if ($device)
    {
        $SMBiosGuid = $device.Guid.Replace("-", "")
        Trace-Execution "Retrieved the SMBios Guid $SMBiosGuid from BMC IP $BmcIP"
    }
    else
    {
        Trace-Error "Failed to retrieve the SMBios Guid from BMC IP $BmcIP"
    }

    return $SMBiosGuid
}


Export-ModuleMember -Function Install-AzureStackPXE
Export-ModuleMember -Function Set-AzureStackPXEFirewallRules
Export-ModuleMember -Function Get-AzureStackPXEConfiguration
Export-ModuleMember -Function New-AzureStackPXEConfiguration
Export-ModuleMember -Function Get-AzureStackPXEClients
Export-ModuleMember -Function New-AzureStackPXEClient
Export-ModuleMember -Function New-AzureStackPXEClientInstance
Export-ModuleMember -Function New-AzureStackDHCPReservation
Export-ModuleMember -Function Remove-AzureStackDHCPReservation
Export-ModuleMember -Function Set-AzureStackPXEClient
Export-ModuleMember -Function Test-AzureStackPxeDeployed
Export-ModuleMember -Function Update-AzureStackPxeBootImage
Export-ModuleMember -Function Use-AzureStackPXEAssembly
Export-ModuleMember -Function Create-RandomPassword
Export-ModuleMember -Function Get-SmBiosGuid
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