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// graph-permissions · BitlockerKey

BitlockerKey.Read.AllMicrosoft Graph permission · Medium risk

Allows an app to read BitLocker keys for all devices, without a signed-in user. Allows read of the recovery key.

Application permission

Medium risk

Read all BitLocker keys. Allows an app to read BitLocker keys for all devices, without a signed-in user. Allows read of the recovery key.

ID57f1cf28-c0c4-4ec3-9a30-19a2eaaf2f6e
ConsentAlways needs admin consent
RiskReads data across the tenant without a signed-in user.

Delegated permission

Low risk

Read BitLocker keys. Allows the app to read BitLocker keys on behalf of the signed-in user, for their owned devices. Allows read of the recovery key.

IDb27a61ec-b99c-4d6a-b126-c4375d08ae30
ConsentNeeds admin consent
RiskRead access, limited to what the signed-in user can see.

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 "57f1cf28-c0c4-4ec3-9a30-19a2eaaf2f6e"

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 "BitlockerKey.Read.All"

Which apps already have it?

powershell6 lines
# Apps that hold BitlockerKey.Read.All 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 "57f1cf28-c0c4-4ec3-9a30-19a2eaaf2f6e" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for BitlockerKey.Read.All
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 "BitlockerKey.Read.All" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other BitlockerKey permissions

Check every app in your tenant → Permission explainer

Sources