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#Function to get AuthToken for Azure GraphAPI
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 }
$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
# Client ID used for Intune scopes
$clientId = "d1ddf0e4-d672-4dae-b554-9d5bdfd93547"
$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
}
}
#Get Admin Username
$User = Read-Host -Prompt "Please specify your user principal name for Azure Authentication"
Write-Host
#Get Auth Token
$authToken = Get-AuthToken -User $User
#Get Scripts
$graphApiVersion = "Beta"
$Resource = "deviceManagement/deviceManagementScripts"
$uri = "https://graph.microsoft.com/$graphApiVersion/$Resource/"
$scriptarray = (Invoke-RestMethod -Uri $uri -Headers $authToken -Method Get).value
foreach ($script in $scriptarray) {
$script.fileName + " ( " + $script.id + " )"
}
$scriptid = Read-Host -Prompt "Enter ID you would like to download, number in brackets without spaces"
Write-Host
$detailuri = "https://graph.microsoft.com/$graphApiVersion/$Resource/" + $scriptid
Invoke-RestMethod -Uri $detailuri -Headers $authToken -Method Get
$script64 = (Invoke-RestMethod -Uri $detailuri -Headers $authToken -Method Get).scriptContent
#Decode Base64 into Scripts
$decodedscript = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($script64))
#output File
New-Item -Path . -Name $script.fileName -ItemType "file" -Value $decodedscript
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