Powershell - Do "Grant Permissions" action on Azure AD Application with Powershell - powershell

Question

I'm creating an Azure AD application using AzureAD module to call Microsoft Graph API. I can successfully generate the access token. But, when I try to call the API I have an error "message": "Invalid scope claims/roles.".
When I click on "Grant Permissions" button in my created application in Azure Portal and retry the call to API, the call is working.
I don't find anywhere how to do this "Grant Permissions" actions with Powershell. Is there a way to do that ?
Thanks
Damien

Answer 1

There is an easy way to do this (as admin), it requires you have the AzureAD and AzureRM modules installed for Powershell and is not supported by Microsoft.
Original post / reference to my blog is here: http://www.lieben.nu/liebensraum/2018/04/how-to-grant-oauth2-permissions-to-an-azure-ad-application-using-powershell-unattended-silently/
The specific code sample that should help you accomplish this:
Function Grant-OAuth2PermissionsToApp{
Param(
[Parameter(Mandatory=$true)]$Username, #global administrator username
[Parameter(Mandatory=$true)]$Password, #global administrator password
[Parameter(Mandatory=$true)]$azureAppId #application ID of the azure application you wish to admin-consent to
)
$secpasswd = ConvertTo-SecureString $Password -AsPlainText -Force
$mycreds = New-Object System.Management.Automation.PSCredential ($Username, $secpasswd)
$res = login-azurermaccount -Credential $mycreds
$context = Get-AzureRmContext
$tenantId = $context.Tenant.Id
$refreshToken = #($context.TokenCache.ReadItems() | where {$_.tenantId -eq $tenantId -and $_.ExpiresOn -gt (Get-Date)})[0].RefreshToken
$body = "grant_type=refresh_token&refresh_token=$($refreshToken)&resource=74658136-14ec-4630-ad9b-26e160ff0fc6"
$apiToken = Invoke-RestMethod "https://login.windows.net/$tenantId/oauth2/token" -Method POST -Body $body -ContentType 'application/x-www-form-urlencoded'
$header = #{
'Authorization' = 'Bearer ' + $apiToken.access_token
'X-Requested-With'= 'XMLHttpRequest'
'x-ms-client-request-id'= [guid]::NewGuid()
'x-ms-correlation-id' = [guid]::NewGuid()}
$url = "https://main.iam.ad.ext.azure.com/api/RegisteredApplications/$azureAppId/Consent?onBehalfOfAll=true"
Invoke-RestMethod -Uri $url -Headers $header -Method POST -ErrorAction Stop
}

Answer 2

I came across the same error 'Refresh token is malformed'. When reading out the refreshtoken the token was twice in the string. Resolved it by adding the line
$refreshtoken = $refreshtoken.Split("`n")[0]

Answer 3

If I am not wrong, then it is using "Admin Consent". In that case, you should be using &prompt=admin_consent in the auth request directly.
If your application requests an app-only permission and a user tries to sign in to the application, an error message is displayed saying the user isn’t able to consent.
Whether or not a permission requires admin consent is determined by the developer that published the resource, and can be found in the documentation for the resource.
Link: Multi-tenant App pattern
List of Available permissions for the Azure AD Graph API and Microsoft Graph API are
Graph API Permission Scopes
Consent Framework
Hope it helps.

Answer 4

This answer builds on top of Jos's answer.
Active Directory Authentication library doesn't make the refresh tokens publicly available anymore. More information can be found in github/azure-powershell/7525.
The modified snippet below worked for me
Connect-AzAccount
$context = Get-AzContext
$tenantId = $context.Tenant.TenantId
Connect-AzureAD -TenantId $tenantId -AccountId $context.Account.Id
$appId = 'Your Application ID'
$token = [Microsoft.Azure.Commands.Common.Authentication.AzureSession]::Instance.AuthenticationFactory.Authenticate($context.Account, $context.Environment, $tenantId, $null, "Never", $null, "74658136-14ec-4630-ad9b-26e160ff0fc6")
$headers = #{
'Authorization' = 'Bearer ' + $token.AccessToken
'X-Requested-With'= 'XMLHttpRequest'
'x-ms-client-request-id'= [guid]::NewGuid()
'x-ms-correlation-id' = [guid]::NewGuid()}
$url = "https://main.iam.ad.ext.azure.com/api/RegisteredApplications/$appId/Consent?onBehalfOfAll=true"
Invoke-RestMethod -Uri $url -Headers $headers -Method POST -ErrorAction Stop