Public/Connect-Graph.ps1
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function Connect-Graph() { <# .SYNOPSIS Retrieve an Auth Token with Delegated User Permissions .DESCRIPTION Retrieve an Auth Token for the AzureAD endpoint, using the Active Directory Authentication Library (ADAL) client library, which is included in the AzureAD PowerShell Module. https://developer.microsoft.com/en-us/graph/docs/concepts/auth_overview .PARAMETER Username User authenticating to Microsoft Graph #> [cmdletbinding()] param( [Parameter(Mandatory = $true)] [string]$Username ) process { try { # Load DLLs $azureADModule = Get-Module -Name "AzureAD" -ListAvailable if ($null -eq $azureADModule) { $azureADModule = Get-Module -Name "AzureADPreview" -ListAvailable } if ($null -eq $azureADModule) { Write-Output "AzureAD Powershell module is not installed. The module can be installed by running 'Install-Module AzureAD' or 'Install-Module AzureADPreview' from an elevated PowerShell prompt. Stopping." exit } if ($azureADModule.count -gt 1) { $latestVersion = ($azureADModule | Select-Object version | Sort-Object)[-1] $azureADModule = $azureADModule | Where-Object { $_.version -eq $latestVersion.version } $adal = Join-Path $azureADModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.dll" $adalForms = Join-Path $azureADModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.Platform.dll" } else { $adal = Join-Path $azureADModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.dll" $adalForms = Join-Path $azureADModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.Platform.dll" } $null = [System.Reflection.Assembly]::LoadFrom($adal) $null = [System.Reflection.Assembly]::LoadFrom($adalForms) $tenant = (New-Object "System.Net.Mail.MailAddress" -ArgumentList $username).Host $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" $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" $userId = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier" -ArgumentList ($username, "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 } $Script:moduleScopeGraphAuthHeader = $authHeader return "Successfully connected to Microsoft Graph! (Tenant ID: $($authResult.TenantId))" } else { Write-Error "Authorization Access Token is null, please re-run authentication..." -ErrorAction Stop } } catch { $Script:moduleScopeGraphAuthHeader = $null $streamReader = New-Object System.IO.StreamReader($_.Exception.Response.GetResponseStream()) $streamReader.BaseStream.Position = 0 $streamReader.DiscardBufferedData() $responseBody = $streamReader.ReadToEnd() Write-Error "Request to $($_.Exception.Response.ResponseUri) failed with HTTP Status $($_.Exception.Response.StatusCode) $($_.Exception.Response.StatusDescription). `nResponse content: `n$responseBody" } } } |