Cannot set "preAuthorizedApplications" object in new App registrations module through Azure Powershell

Question

Short Scenrario: A muti tenant front end javascript (React.JS) Web Application calls a multi tenant ASP.NET Core 2.2 WebAPI from the browser.

Authentication:

1. ADAL.js in the front end app takes care of getting a token from either AzureAD1 or AzureAD2 or AzureAD3... when the User signs-in (based on the User's original Azure Active Directory).

2. The User gives consent to the front end Web App (scope: Sign in and read user profile) which is delegated to the WebAPI too. (meaning the user does not need to consent to the WebAPI as well)

3. The front end Web App calls the WebAPI with the bearer token to get the resources.

Problem: I must automate the deployment of a new environment. And set the manifest file accordingly (It's a SaaS solution)

1. In the manifest file I need to expose the WebAPI for the client application (https://learn.microsoft.com/en-us/azure/active-directory/develop/quickstart-configure-app-expose-web-apis#expose-a-new-scope-through-the-ui)
2. Setting "knownClientApplications" is not enough (due to previously described delegation)
3. The new v2 endpoint (https://learn.microsoft.com/en-us/azure/active-directory/develop/v2-overview) has a new App Registration feature. The old one is called "Legacy" now and will be deprecated starting May 2019.
4. In the Azure Portal need to expose the API and add the front end WebApp as an "Authorized cient applications".

This step will add a new object in the manifest file:

"preAuthorizedApplications": [
        {
            "appId": "guid",
            "permissionIds": [
                "guid"
            ]
        }
    ],

5. But it's still not available throuh PowerShell! (https://learn.microsoft.com/en-us/powershell/module/azuread/set-azureadapplication?view=azureadps-2.0)

How can I add this "preAuthorizedApplications" section into the manifest file using Azure PowerShell? Why is it available in the portal but not in PS yet? It's the other way around usually...

08-05-2019 Update based on the answer:

I am getting the access token via a Service Principal:

$adTokenUrl = "https://login.microsoftonline.com/$TenantId/oauth2/token"
$resource = "https://graph.windows.net/"

$body = @{
    grant_type    = "client_credentials"
    client_id     = "$ServicePrincipalId"
    client_secret = "$ServicePrincipalKey"
    resource      = "$resource"
}

$response = Invoke-RestMethod -Method 'Post' -Uri $adTokenUrl -ContentType "application/x-www-form-urlencoded" -Body $body
$token = $response.access_token

According to the docs: https://learn.microsoft.com/en-us/graph/api/application-update?view=graph-rest-beta&tabs=cs

The Service Principal should have at least Application.ReadWrite.OwnedBy, and most Application.ReadWrite.All privileges.

Should I ask our AAD admin to grant the below rights to the Service Principal?

08-05-2019 Update 2: Service Principal has been granted with ALL of the highlighted rights above.

Attempt 1:

Step 1: getting an access_token via the Service Principal (Owner of the Api app to be updated)

$adTokenUrl = "https://login.microsoftonline.com/$(TenantId)/oauth2/token"
$resource = "https://graph.microsoft.com/"

$body = @{
    grant_type    = "client_credentials"
    client_id     = "$(ServicePrincipalId)"
    client_secret = "$(ServicePrincipalKey)"
    resource      = "$resource"
}

$response = Invoke-RestMethod -Method 'Post' -Uri $adTokenUrl -ContentType "application/x-www-form-urlencoded" -Body $body
$token = $response.access_token

Step 2: using this access_token, building up my PATCH request as per Md Farid Uddin Kiron's suggestion, and

Result: The remote server returned an error: (403) Forbidden.

09-05-2019 Update 3: After some kind and detailed explanation and guidance, I got this to work and getting HTTP 204 for my Postman request. Only thing left is to integrate this steps into my pipeline.

See accepted answer. It works. If someone has the same issue, please read the other answer from Md Farid Uddin Kiron.

Answer 1

If you want to avoid calling directly the graph API (maybe you are in an azure pipeline using a Service Connection and don't have access to the credentials) you can do this :

$AppName = << WebApp >>
$preAuthorizedApplicationsAppId = <<GUID>>

# Get the application and delegated permission to pre-authorize
$appRegistration = Get-AzureADMSApplication -Filter "displayName eq '$AppName'"
$oauth2Permission = $appRegistration.Api.OAuth2PermissionScopes | Where-Object {$_.Value -eq $AppName -and $_.Type -eq 'Admin'}

# Build a PreAuthorizedApplication object
$preAuthorizedApplication = New-Object 'Microsoft.Open.MSGraph.Model.PreAuthorizedApplication'
$preAuthorizedApplication.AppId = $preAuthorizedApplicationsAppId
$preAuthorizedApplication.DelegatedPermissionIds = @($oauth2Permission.Id)

$appRegistration.Api.PreAuthorizedApplications = New-Object 'System.Collections.Generic.List[Microsoft.Open.MSGraph.Model.PreAuthorizedApplication]'
$appRegistration.Api.PreAuthorizedApplications.Add($preAuthorizedApplication)

# Update the Application object
Set-AzureADMSApplication -ObjectId $appRegistration.Id -Api $appRegistration.Api

This answer comes from this GitHub issue.

Answer 2

You are right, seems there is something faultiness exists in AzureAD powershell module. That not works for me too .

If you want to modify your app manifest using powershell to add "preAuthorizedApplications" section, you can try the powershell script below.

I have tested on my side and it works for me.

In theory, I have called Microsoft Graph API to modify the app manifest . If you have any further concerns, please feel free to let me know.

$AdAdminUserName = "<-your Azure ad admin username ->"

$AdAdminPass="<-your Azure ad admin password ->"

$AdAppObjId = "<-your app obj id->"

$AdPreAuthAppId = "<-the app that need to be pre authed ->"

$AdAppScopeId = "<-your app scope id->"

$tenantName = "<-your tenant name->"


$body=@{
    "grant_type"="password";
    "resource"="https://graph.microsoft.com/";
    "client_id"="1950a258-227b-4e31-a9cf-717495945fc2";
    "username"=$AdAdminUserName;
    "password" = $AdAdminPass
}

$requrl = "https://login.microsoftonline.com/"+$tenantName+"/oauth2/token" 

$result=Invoke-RestMethod -Uri $requrl -Method POST -Body $body 

$headers = New-Object 'System.Collections.Generic.Dictionary[String,String]'
$headers.Add("Content-Type","application/json")
$headers.Add("Authorization","Bearer " + $result.access_token)


$preAuthBody = "{`"api`": {`"preAuthorizedApplications`": [{`"appId`": `"" + $AdPreAuthAppId + "`",`"permissionIds`": [`"" + $AdAppScopeId + "`"]}]}}"

$requrl= "https://graph.microsoft.com/beta/applications/"+$AdAppObjId

Invoke-RestMethod -Uri $requrl -Method PATCH -Body  $preAuthBody  -Headers $headers

Note: ROPC is not safe as Microsoft does not recommend to use that. It also does not allow to use MFA that is why it is little dangerous.