azureblog.co.uk
← cd ~/graph-permissions
// graph-permissions · Policy

Policy.ReadWrite.ExternalIdentitiesMicrosoft Graph permission · Medium risk

Allows the application to read and update the organization's external identities policy without a signed-in user. For example, external identities policy controls if users invited to access resources in your organization via B2B collaboration or B2B direct connect are allowed to self-service leave.

Application permission

Medium risk

Read and write your organization's external identities policy. Allows the application to read and update the organization's external identities policy without a signed-in user. For example, external identities policy controls if users invited to access resources in your organization via B2B collaboration or B2B direct connect are allowed to self-service leave.

ID03cc4f92-788e-4ede-b93f-199424d144a5
ConsentAlways needs admin consent
RiskCan make changes. Check the scope is as narrow as possible.

Delegated permission

Medium risk

Read and write your organization's external identities policy. Allows the application to read and update the organization's external identities policy on behalf of the signed-in user. For example, external identities policy controls if users invited to access resources in your organization via B2B collaboration or B2B direct connect are allowed to self-service leave.

IDb5219784-1215-45b5-b3f1-88fe1081f9c0
ConsentNeeds admin consent
RiskCan make changes. Check the scope is as narrow as possible.

Grant it to an app

In the portal: App registrations › your app › API permissions › Add a permission › Microsoft Graph › Application permissions, then grant admin consent. Or with Graph PowerShell:

powershell5 lines
Connect-MgGraph -Scopes "Application.Read.All", "AppRoleAssignment.ReadWrite.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
$app   = Get-MgServicePrincipal -Filter "appId eq '<your app's client id>'"
New-MgServicePrincipalAppRoleAssignment -ServicePrincipalId $app.Id `
    -PrincipalId $app.Id -ResourceId $graph.Id -AppRoleId "03cc4f92-788e-4ede-b93f-199424d144a5"

Ask for it when signing in

Delegated permissions act as the signed-in user, so the app can never do more than that user can.

powershell1 line
Connect-MgGraph -Scopes "Policy.ReadWrite.ExternalIdentities"

Which apps already have it?

powershell6 lines
# Apps that hold Policy.ReadWrite.ExternalIdentities as an application permission
Connect-MgGraph -Scopes "Application.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgServicePrincipalAppRoleAssignedTo -ServicePrincipalId $graph.Id -All |
    Where-Object AppRoleId -eq "03cc4f92-788e-4ede-b93f-199424d144a5" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for Policy.ReadWrite.ExternalIdentities
Connect-MgGraph -Scopes "Application.Read.All", "Directory.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgOauth2PermissionGrant -All |
    Where-Object { $_.ResourceId -eq $graph.Id -and ($_.Scope -split " ") -contains "Policy.ReadWrite.ExternalIdentities" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other Policy permissions

Check every app in your tenant → Permission explainer

Sources