Remove-AzureADWHfBKey.ps1

#
# Remove-AzureADWHfBKey.ps1
#
# Copyright 2019 Microsoft. All rights reserved.
#

<#
    Remove-AzureADWHfBKey
#>

function Remove-AzureADWHfBKey
{
    <#.SYNOPSIS
        Prompts the user for confirmation to remove Windows Hello for Business (WHfB) keys
        from Azure Active Directory and performs the removals or exits based on response.
 
    .DESCRIPTION
        Prompts the user with a warning before making any deletes. If the response is negative
        the function returns without making any changes to Azure Active Directory. If the
        response is positive, this function will process all objects in the pipeline to delete
        the associated keys from Azure Active Directory.
 
    .PARAMETER Tenant
        Specifies the tenant associated with the operation.
 
    .PARAMETER UserPrincipalName
        Specifies the UPN associated with the operation.
 
    .PARAMETER Logging
        Optional. This switch will enable logging to a file
 
    .PARAMETER WHfBKey
        Specifies the pipelined object representing the Windows Hello for Business (WHfB) keys.
 
    .INPUTS
        Remove-AzureADWHfBKey accepts objects created by Get-AzureADWHfBKeys.
 
    .OUTPUTS
        None. Remove-AzureADWHfBKey does not emit outputs apart from logging to file or errors.
 
    .EXAMPLE
 
        PS C:\>Import-Csv WHfBKeys.csv | Remove-AzureADWHfBKey -Tenant contoso.com -UserPrincipalName user@contoso.com -Logging
 
        Remove all WHfB keys from Azure Active Directory that are included in a CSV file.
        The CSV file can be populated using Get-AzureADWHfBKeys.
    #>


    [CmdletBinding()]
    param
        (
        [Parameter(Mandatory=$false)]
        $Tenant,
        [Parameter(Mandatory=$false)]
        $UserPrincipalName,
        [Parameter(Mandatory=$false)]
        [Switch]
        $Logging,
        [Parameter(ValueFromPipeline=$true)]
        $WHfBKey
    )

    Begin
    {
        InitializeAzureAD -Tenant $Tenant -UserPrincipalName $UserPrincipalName

        if ($logging -eq $true)
        {
            $script:enableLogging = 1
            DiagLog "Started Remove-AzureADWHfBKey." -logOnly
        }

        $warning1 = "Are you certain you want to delete the specified keys?"
        $warning2 = "If keys are deleted in error users will no longer be able to authenticate with WHfB until reseting their PIN."
        $warning3 = "This could cause a business disruption and require end user support."
        write-host $warning1 -foregroundcolor yellow
        write-host $warning2 -foregroundcolor yellow
        write-host $warning3 -foregroundcolor yellow

        $prompt = "[Delete, No]"

        $confirmation = Read-Host $prompt
        while($confirmation -ne "Delete" -and $confirmation -ne "No" -and $confirmation -ne "N")
        {
            $confirmation = Read-Host $prompt
        }

        if ($confirmation -eq 'n' -or $confirmation -eq 'no')
        {
            Write-host "Goodbye."
            return
        }
    }

    Process
    {
        if ($_ -eq $null)
        {
            write-error "Pipelined WHfBKey objects was null"
            return
        }

        $result = Remove-KeysForUser $_

        Write-Output $result
    }
}

<#
    Remove-KeysForUser
#>

function Remove-KeysForUser
{
    <#.SYNOPSIS
        Deletes the pipelined key from the associated User in Azure Active Directory.
 
    .DESCRIPTION
        Accepts from the pipeline an object reprenting the Windows Hello for Business (WHfB) key
        and associated metadata then sends a patch request to Azure Active Directory to remove
        the key from the User.
 
    .PARAMETER WHfBKey
        Specifies the pipelined object.
    #>


    [CmdletBinding()]
    param(
        [Parameter(ValueFromPipeline=$true)]
        $WHfBKey
    )

    Process
    {
        $tenantObjects = @()
        $sb = New-Object -TypeName "System.Text.StringBuilder";

        #$uri = "https://graph.windows.net/$($WHfBKey.Tenant)/users?`$filter=startswith(userPrincipalName, '" + $($WHfBKey.UserPrincipalName) + "')&api-version=1.6-internal"
        $uri = "https://graph.windows.net/$($WHfBKey.Tenant)/users/$($WHfBKey.UserPrincipalName)?api-version=1.6-internal"

        $user = MakeAzureADGraphRequest -Uri $uri -Method Get

        foreach ($key in $user.searchableDeviceKey)
        {
            if ($key.keyIdentifier -eq $WHfBKey.Id)
            {
                DiagLog "deleting " $key.keyIdentifier "for user " $WHfBKey.userPrincipalName
            }
            else
            {
                $jsonKey = ConvertTo-Json $key
                $tenantObjects += $jsonKey
            }
        }

        # Build body for Patch request
        $sb.Append('{"searchableDeviceKey":[')

        $count = $tenantObjects.Length

        for ($i = 0; $i -lt $count; $i++)
        {
            $sb.Append($tenantObjects[$i])

            if ($i -lt $count -1) { $sb.Append(",") }
        }

        $sb.Append("]}")

        $body = $sb.ToString()

        # Write back to AAD user all keys except those being removed
        MakeAzureADGraphRequest -Uri $uri -Method Patch -Body $body
    }
}

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