Automating with PowerShell: Disabling application consent on all tenants

Before we get into this, I recently setup a new CyberDrain Discord server for questions about CIPP, and the CTFs I give. Join our discord here

I’ve blogged about monitoring the settings to approving application consent not too long ago, where I’ve discussed that it’s annoying we don’t have a central way of doing this without the MSOL module. The MSOL module is considered deprecated and can’t be used with modern PowerShell, or within Azure Functions without getting deserialized objects back.

This method allows you to disable application consent without using the MSOL module, and allows you to run that for all your tenants, giving you more options to use in your automation.

Fair warning’; the script also disables iOS native mail mail. To enable those you can simply visit this link and give consent for that tenant, unfortunately there is no process for that yet. Remember to change the link to your specific tenant ID.

https://login.microsoftonline.com/<YOURONMICROSOFT.COM>/oauth2/authorize?client_id=f8d98a96-0999-43f5-8af3-69971c7bb423&response_type=code&redirect_uri=com.apple.Preferences://oauth-redirect/&prompt=admin_consent

Single tenant script

As is the case with most of my scripts, you’ll need your secure application model for this. Specifically your Exchange Refresh Token.

$Tenant = "YourTenant.Onmicrosoft.com"
$ENV:ExchangeRefreshToken = "YourLongRefreshToken"

try {
    $uri = "https://login.microsoftonline.com/$($Tenant)/oauth2/token"
    $body = "resource=https://admin.microsoft.com&grant_type=refresh_token&refresh_token=$($ENV:ExchangeRefreshToken)"
    $token = Invoke-RestMethod $uri -Body $body -ContentType "application/x-www-form-urlencoded" -ErrorAction SilentlyContinue -Method post
    $oAuth = Invoke-RestMethod -ContentType "application/json;charset=UTF-8" -Uri 'https://admin.microsoft.com/admin/api/settings/apps/IntegratedApps' -Body '{"Enabled":false}' -Method POST -Headers @{
        Authorization            = "Bearer $($token.access_token)";
        "x-ms-client-request-id" = [guid]::NewGuid().ToString();
        "x-ms-client-session-id" = [guid]::NewGuid().ToString()
        'x-ms-correlation-id'    = [guid]::NewGuid()
        'X-Requested-With'       = 'XMLHttpRequest' 
    }

}
catch {
write-error "Failed to apply Application Consent Mode Error: $($_.exception.message)" 
}

Multiple Tenant Script

This script loops through all your tenants and makes sure it’s disabled everywhere. Just be sure that you don’t have any legacy application users when running this, and remember that this does not remove consent that has already been granted.

#
$ApplicationId = 'AppID'
$ApplicationSecret = 'AppSecret'
$RefreshToken = 'RefreshTokens'
$ENV:ExchangeRefreshToken = 'YourExchangeRefreshToken'
#
$credential = New-Object System.Management.Automation.PSCredential($ApplicationId, ($ApplicationSecret | Convertto-SecureString -AsPlainText -Force))
$graphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.microsoft.com/.default' -ServicePrincipal
     
write-host "Connecting to the Graph API to get all tenants." -ForegroundColor Green
$Contractheaders = @{ "Authorization" = "Bearer $($graphToken.accesstoken)" }  
$Customers = (Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/contracts?`$top=999" -Method GET -Headers $Contractheaders).value
foreach ($Customer in $Customers) {
try {
    $uri = "https://login.microsoftonline.com/$($customer.customerid)/oauth2/token"
    $body = "resource=https://admin.microsoft.com&grant_type=refresh_token&refresh_token=$($ENV:ExchangeRefreshToken)"
    $token = Invoke-RestMethod $uri -Body $body -ContentType "application/x-www-form-urlencoded" -ErrorAction SilentlyContinue -Method post
    $oAuth = Invoke-RestMethod -ContentType "application/json;charset=UTF-8" -Uri 'https://admin.microsoft.com/admin/api/settings/apps/IntegratedApps' -Body '{"Enabled":false}' -Method POST -Headers @{
        Authorization            = "Bearer $($token.access_token)";
        "x-ms-client-request-id" = [guid]::NewGuid().ToString();
        "x-ms-client-session-id" = [guid]::NewGuid().ToString()
        'x-ms-correlation-id'    = [guid]::NewGuid()
        'X-Requested-With'       = 'XMLHttpRequest' 
    }
    Log-request -API "Standards" -tenant $tenant -message  "Application Consent Mode has been enabled." -sev Info
}
catch {
    Log-request -API "Standards" -tenant $tenant -message  "Failed to apply Application Consent Mode Error: $($_.exception.message)" -sev Error
}
}

As always, I hope you enjoy and happy PowerShelling! 🙂

1 Comment

  1. Steven Glasziou November 3, 2021 at 11:22 pm

    Huh, that is interesting. I didn’t know that you could do it via an Admin API that uses an exchange token. I ended up doing it (well, not disabling but setting the policies) via the AAD preview module:

    $Block = {
    $PolicyCheck = (Get-AzureADMSAuthorizationPolicy).PermissionGrantPolicyIdsAssignedToDefaultUserRole
    If($PolicyCheck -ne “managePermissionGrantsForSelf.microsoft-user-default-low”){
    Get-AzureADMSAuthorizationPolicy | Set-AzureADMSAuthorizationPolicy -PermissionGrantPolicyIdsAssignedToDefaultUserRole @(“managePermissionGrantsForSelf.microsoft-user-default-low”)
    }
    }

    Import-Csv ‘.\TargetList.csv’ |
    Invoke-SecAppAzureAd -ScriptBlock $Block

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