ManagedDevices_Get.ps1

<#

.COPYRIGHT
Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
See LICENSE in the project root for license information.

#>

####################################################

function Get-AuthToken {

<#
.SYNOPSIS
This function is used to authenticate with the Graph API REST interface
.DESCRIPTION
The function authenticate with the Graph API Interface with the tenant name
.EXAMPLE
Get-AuthToken
Authenticates you with the Graph API interface
.NOTES
NAME: Get-AuthToken
#>

[cmdletbinding()]

param
(
    [Parameter(Mandatory=$true)]
    $User
)

$userUpn = New-Object "System.Net.Mail.MailAddress" -ArgumentList $User

$tenant = $userUpn.Host

Write-Host "Checking for AzureAD module..."

    $AadModule = Get-Module -Name "AzureAD" -ListAvailable

    if ($AadModule -eq $null) {

        Write-Host "AzureAD PowerShell module not found, looking for AzureADPreview"
        $AadModule = Get-Module -Name "AzureADPreview" -ListAvailable

    }

    if ($AadModule -eq $null) {
        write-host
        write-host "AzureAD Powershell module not installed..." -f Red
        write-host "Install by running 'Install-Module AzureAD' or 'Install-Module AzureADPreview' from an elevated PowerShell prompt" -f Yellow
        write-host "Script can't continue..." -f Red
        write-host
        exit
    }

# Getting path to ActiveDirectory Assemblies
# If the module count is greater than 1 find the latest version

    if($AadModule.count -gt 1){

        $Latest_Version = ($AadModule | select version | Sort-Object)[-1]

        $aadModule = $AadModule | ? { $_.version -eq $Latest_Version.version }

            # Checking if there are multiple versions of the same module found

            if($AadModule.count -gt 1){

            $aadModule = $AadModule | select -Unique

            }

        $adal = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.dll"
        $adalforms = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.Platform.dll"

    }

    else {

        $adal = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.dll"
        $adalforms = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.Platform.dll"

    }

[System.Reflection.Assembly]::LoadFrom($adal) | Out-Null

[System.Reflection.Assembly]::LoadFrom($adalforms) | Out-Null

# Using this authentication method requires a clientID.  Register a new app in the Entra ID admin center to obtain a clientID.  More information
# on app registration and clientID is available here: https://learn.microsoft.com/entra/identity-platform/quickstart-register-app 

$clientId = "<replace with your clientID>"

$redirectUri = "urn:ietf:wg:oauth:2.0:oob"

$resourceAppIdURI = "https://graph.microsoft.com"

$authority = "https://login.microsoftonline.com/$Tenant"

    try {

    $authContext = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext" -ArgumentList $authority

    # https://msdn.microsoft.com/en-us/library/azure/microsoft.identitymodel.clients.activedirectory.promptbehavior.aspx
    # Change the prompt behaviour to force credentials each time: Auto, Always, Never, RefreshSession

    $platformParameters = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters" -ArgumentList "Auto"

    $userId = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier" -ArgumentList ($User, "OptionalDisplayableId")

    $authResult = $authContext.AcquireTokenAsync($resourceAppIdURI,$clientId,$redirectUri,$platformParameters,$userId).Result

        # If the accesstoken is valid then create the authentication header

        if($authResult.AccessToken){

        # Creating header for Authorization token

        $authHeader = @{
            'Content-Type'='application/json'
            'Authorization'="Bearer " + $authResult.AccessToken
            'ExpiresOn'=$authResult.ExpiresOn
            }

        return $authHeader

        }

        else {

        Write-Host
        Write-Host "Authorization Access Token is null, please re-run authentication..." -ForegroundColor Red
        Write-Host
        break

        }

    }

    catch {

    write-host $_.Exception.Message -f Red
    write-host $_.Exception.ItemName -f Red
    write-host
    break

    }

}

####################################################

Function Get-ManagedDevices(){

<#
.SYNOPSIS
This function is used to get Intune Managed Devices from the Graph API REST interface
.DESCRIPTION
The function connects to the Graph API Interface and gets any Intune Managed Device
.EXAMPLE
Get-ManagedDevices
Returns all managed devices but excludes EAS devices registered within the Intune Service
.EXAMPLE
Get-ManagedDevices -IncludeEAS
Returns all managed devices including EAS devices registered within the Intune Service
.NOTES
NAME: Get-ManagedDevices
#>

[cmdletbinding()]

param
(
    [switch]$IncludeEAS,
    [switch]$ExcludeMDM
)

# Defining Variables
$graphApiVersion = "beta"
$Resource = "deviceManagement/managedDevices"

try {

    $Count_Params = 0

    if($IncludeEAS.IsPresent){ $Count_Params++ }
    if($ExcludeMDM.IsPresent){ $Count_Params++ }
        
        if($Count_Params -gt 1){

        write-warning "Multiple parameters set, specify a single parameter -IncludeEAS, -ExcludeMDM or no parameter against the function"
        Write-Host
        break

        }
        
        elseif($IncludeEAS){

        $uri = "https://graph.microsoft.com/$graphApiVersion/$Resource"

        }

        elseif($ExcludeMDM){

        $uri = "https://graph.microsoft.com/$graphApiVersion/$Resource`?`$filter=managementAgent eq 'eas'"

        }
        
        else {
    
        $uri = "https://graph.microsoft.com/$graphApiVersion/$Resource`?`$filter=managementAgent eq 'mdm' and managementAgent eq 'easmdm'"
        Write-Warning "EAS Devices are excluded by default, please use -IncludeEAS if you want to include those devices"
        Write-Host

        }

        (Invoke-RestMethod -Uri $uri -Headers $authToken -Method Get).Value
    
    }

    catch {

    $ex = $_.Exception
    $errorResponse = $ex.Response.GetResponseStream()
    $reader = New-Object System.IO.StreamReader($errorResponse)
    $reader.BaseStream.Position = 0
    $reader.DiscardBufferedData()
    $responseBody = $reader.ReadToEnd();
    Write-Host "Response content:`n$responseBody" -f Red
    Write-Error "Request to $Uri failed with HTTP Status $($ex.Response.StatusCode) $($ex.Response.StatusDescription)"
    write-host
    break

    }

}

####################################################

Function Get-AADUser(){

<#
.SYNOPSIS
This function is used to get AAD Users from the Graph API REST interface
.DESCRIPTION
The function connects to the Graph API Interface and gets any users registered with AAD
.EXAMPLE
Get-AADUser
Returns all users registered with Azure AD
.EXAMPLE
Get-AADUser -userPrincipleName user@domain.com
Returns specific user by UserPrincipalName registered with Azure AD
.NOTES
NAME: Get-AADUser
#>

[cmdletbinding()]

param
(
    $userPrincipalName,
    $Property
)

# Defining Variables
$graphApiVersion = "v1.0"
$User_resource = "users"

    try {

        if($userPrincipalName -eq "" -or $userPrincipalName -eq $null){

        $uri = "https://graph.microsoft.com/$graphApiVersion/$($User_resource)"
        (Invoke-RestMethod -Uri $uri -Headers $authToken -Method Get).Value

        }

        else {

            if($Property -eq "" -or $Property -eq $null){

            $uri = "https://graph.microsoft.com/$graphApiVersion/$($User_resource)/$userPrincipalName"
            Write-Verbose $uri
            Invoke-RestMethod -Uri $uri -Headers $authToken -Method Get

            }

            else {

            $uri = "https://graph.microsoft.com/$graphApiVersion/$($User_resource)/$userPrincipalName/$Property"
            Write-Verbose $uri
            (Invoke-RestMethod -Uri $uri -Headers $authToken -Method Get).Value

            }

        }

    }

    catch {

    $ex = $_.Exception
    $errorResponse = $ex.Response.GetResponseStream()
    $reader = New-Object System.IO.StreamReader($errorResponse)
    $reader.BaseStream.Position = 0
    $reader.DiscardBufferedData()
    $responseBody = $reader.ReadToEnd();
    Write-Host "Response content:`n$responseBody" -f Red
    Write-Error "Request to $Uri failed with HTTP Status $($ex.Response.StatusCode) $($ex.Response.StatusDescription)"
    write-host
    break

    }

}

####################################################

#region Authentication

write-host

# Checking if authToken exists before running authentication
if($global:authToken){

    # Setting DateTime to Universal time to work in all timezones
    $DateTime = (Get-Date).ToUniversalTime()

    # If the authToken exists checking when it expires
    $TokenExpires = ($authToken.ExpiresOn.datetime - $DateTime).Minutes

        if($TokenExpires -le 0){

        write-host "Authentication Token expired" $TokenExpires "minutes ago" -ForegroundColor Yellow
        write-host

            # Defining User Principal Name if not present

            if($User -eq $null -or $User -eq ""){

            $User = Read-Host -Prompt "Please specify your user principal name for Azure Authentication"
            Write-Host

            }

        $global:authToken = Get-AuthToken -User $User

        }
}

# Authentication doesn't exist, calling Get-AuthToken function

else {

    if($User -eq $null -or $User -eq ""){

    $User = Read-Host -Prompt "Please specify your user principal name for Azure Authentication"
    Write-Host

    }

# Getting the authorization token
$global:authToken = Get-AuthToken -User $User

}

#endregion

####################################################

$ManagedDevices = Get-ManagedDevices

if($ManagedDevices){

    foreach($Device in $ManagedDevices){

    $DeviceID = $Device.id

    write-host "Managed Device" $Device.deviceName "found..." -ForegroundColor Yellow
    Write-Host
    $Device

        if($Device.deviceRegistrationState -eq "registered"){

        $UserId = $Device.userId

        $User = Get-AADUser $userId

        Write-Host "Device Registered User:" $User.displayName -ForegroundColor Cyan
        Write-Host "User Principle Name:" $User.userPrincipalName

        }

    Write-Host

    }

}

else {

Write-Host
Write-Host "No Managed Devices found..." -ForegroundColor Red
Write-Host

}