Device.ps1
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# This file contains functions for local AAD Joined devices # Exports the device certificate of the local device # Dec 17th 2021 function Export-LocalDeviceCertificate { <# .SYNOPSIS Exports the device certificate and private key of the local AAD joined/registered device. .DESCRIPTION Exports the device certificate and private key of the local AAD joined/registered device. Certificate filename: <deviceid>.pfx Private key filename: <deviceid>.pem .Example PS C\:>Export-AADIntLocalDeviceCertificate Certificate exported to f72ad27e-5833-48d3-b1d6-00b89c429b91.pfx #> [CmdletBinding()] param() Process { # Check whether we are running in elevated session Test-LocalAdministrator -Warn | Out-Null # Get the join info if(($joinInfo = Get-LocalDeviceJoinInfo) -eq $null) { Throw "Device seems not to be joined or registered." } # Get the certificate Write-Verbose "Getting certificate $($joinInfo.CertThumb)" $certificate = Get-Item -Path $joinInfo.CertPath $binCert = $certificate.Export([System.Security.Cryptography.X509Certificates.X509ContentType]::Cert) # Get the private key Write-Verbose "Device key name: $($joinInfo.KeyName)" if($joinInfo.JoinType -eq "Joined") { $keyPath = "$env:ALLUSERSPROFILE" } else { Write-Warning "Accessing key in user context will FAIL if already elevated to LOCAL SYSTEM." $keyPath = "$env:APPDATA" } # CryptoAPI and CNG stores keys in different directories # https://docs.microsoft.com/en-us/windows/win32/seccng/key-storage-and-retrieval $paths = @( "$keyPath\Microsoft\Crypto\RSA\MachineKeys\$($joinInfo.KeyName)" "$keyPath\Microsoft\Crypto\Keys\$($joinInfo.KeyName)" ) foreach($path in $paths) { $keyBlob = Get-Content $path -Encoding byte -ErrorAction SilentlyContinue if($keyBlob) { Write-Verbose "Key loaded from $path" break } } if(!$keyBlob) { if($joinInfo.KeyName.EndsWith(".PCPKEY")) { # This machine has a TPM Throw "PCP keys are not supported, unable to export private key!" } else { Throw "Error accessing key. If you are already elevated to LOCAL SYSTEM, restart PowerShell and try again." } return } # Parse the key blob $blobType = [System.BitConverter]::ToInt32($keyBlob,0) switch($blobType) { 1 { $deviceKey = Parse-CngBlob -Data $keyBlob -Decrypt } 2 { $deviceKey = Parse-CapiBlob -Data $keyBlob -Decrypt } default { throw "Unsupported key blob type" } } $fileName = "$($joinInfo.deviceId).pfx" Set-Content $fileName -Value (New-PfxFile -RSAParameters $deviceKey.RSAParameters -X509Certificate $binCert) -Encoding Byte Write-Host "Device certificate exported to $fileName" } } # Exports the transport key of the local device # Dec 18th 2021 function Export-LocalDeviceTransportKey { <# .SYNOPSIS Exports the transport key of the local AAD joined/registered device. .DESCRIPTION Exports the transport key of the local AAD joined/registered device. Filename: <deviceid>_tk.pem .Example PS C\:>Export-AADIntLocalDeviceTransportKey Transport key exported to f72ad27e-5833-48d3-b1d6-00b89c429b91_tk.pem #> [CmdletBinding()] param() Process { # Check whether we are running in elevated session Test-LocalAdministrator -Warn | Out-Null # Get the join info if(($joinInfo = Get-LocalDeviceJoinInfo) -eq $null) { Throw "Device seems not to be joined or registered." } # Get the private key Write-Verbose "Getting transport key" $transportKeys = Get-LocalDeviceTransportKeys -JoinType $joinInfo.JoinType -IdpDomain $joinInfo.idpDomain -TenantId $joinInfo.tenantId -UserEmail $joinInfo.UserEmail $fileName = "$($joinInfo.deviceId)_tk.pem" Set-Content $fileName -Value (Convert-RSAToPEM -RSAParameters $transportKeys.RSAParameters) Write-Host "Transport key exported to $fileName" } } # Joins the local device to Azure AD # Dec 20th 2021 function Join-LocalDeviceToAzureAD { <# .SYNOPSIS Joins the local Windows device to Azure AD using the given certificate. .DESCRIPTION Joins the local Windows device to Azure AD using the given certificate created earlier with AADInternals. Creates required registry keys and values, saves transport key to SystemKeys, and starts related scheduled tasks. .Parameter OSVersion The operating system version of the device. Defaults to "10.0.18363.0" .Parameter PfxFileName File name of the .pfx device certificate. .Parameter PfxPassword The password of the .pfx device certificate. .Parameter TransportKeyFileName File name of the transportkey .Parameter UserPrincipalName The user principal name of the user. .EXAMPLE PS\:>Export-AADIntLocalDeviceCertificate Certificate exported to f72ad27e-5833-48d3-b1d6-00b89c429b91.pfx PS C\:>Export-AADIntLocalDeviceTransportKey Transport key exported to f72ad27e-5833-48d3-b1d6-00b89c429b91_tk.pem PS\:>Join-AADIntLocalDeviceToAzureAD -UserPrincipalName JohnD@company.com -PfxFileName .\f72ad27e-5833-48d3-b1d6-00b89c429b91.pfx -TransportKeyFileName .\f72ad27e-5833-48d3-b1d6-00b89c429b91_tk.pem Device configured. To confirm success, restart and run: dsregcmd /status .EXAMPLE $token = Get-AADIntAccessTokenForAADJoin -SaveToCache PS\:>Join-AADIntDeviceToAzureAD -DeviceName "My computer" -DeviceType "Commodore" -OSVersion "C64" Device successfully registered to Azure AD: DisplayName: "My computer" DeviceId: d03994c9-24f8-41ba-a156-1805998d6dc7 Cert thumbprint: 78CC77315A100089CF794EE49670552485DE3689 Cert file name : "d03994c9-24f8-41ba-a156-1805998d6dc7.pfx" Local SID: S-1-5-32-544 Additional SIDs: S-1-12-1-797902961-1250002609-2090226073-616445738 S-1-12-1-3408697635-1121971140-3092833713-2344201430 S-1-12-1-2007802275-1256657308-2098244751-2635987013 PS\:>Join-AADIntLocalDeviceToAzureAD -UserPrincipalName JohnD@company.com -PfxFileName .\d03994c9-24f8-41ba-a156-1805998d6dc7.pfx Device configured. To confirm success, restart and run: dsregcmd /status #> [cmdletbinding()] Param( [Parameter(Mandatory=$True)] [String]$UserPrincipalName, [Parameter(Mandatory=$True)] [String]$PfxFileName, [Parameter(Mandatory=$False)] [String]$PfxPassword, [Parameter(Mandatory=$False)] [String]$TransportKeyFileName, [Parameter(Mandatory=$False)] [String]$OSVersion = "10.0.19044.1288" ) Begin { $sha256 = [System.Security.Cryptography.SHA256]::Create() } Process { # Check whether we are running in elevated session Test-LocalAdministrator -Throw | Out-Null # Import the certificate to LocalMachine's Personal store if($PfxPassword) { $certificate = Import-PfxCertificate -FilePath $PfxFileName -Password ($PfxPassword | ConvertTo-SecureString -AsPlainText -Force) -CertStoreLocation Cert:\LocalMachine\My -Exportable } else { $certificate = Import-PfxCertificate -FilePath $PfxFileName -CertStoreLocation Cert:\LocalMachine\My -Exportable } Write-Verbose "Certificate ($($certificate.Subject)) imported to CERT:\LocalMachine\My\$($certificate.Thumbprint)" # Collect the required information $thumbprint = $certificate.Thumbprint $oids = Parse-CertificateOIDs -Certificate $certificate $tenantId = $oids.TenantId $deviceId = $oids.DeviceId Write-Verbose "Thumbprint: $thumbprint" Write-Verbose "Device ID: $deviceId" Write-Verbose "Tenant ID: $tenantId" Write-Verbose "Object ID: $($oids.ObjectId)" Write-Verbose "Region: $($oids.Region)" Write-Verbose "Join Type: $($oids.JoinType)" if($oids.JoinType -eq 0) { # Certificates for AAD Registered devices won't work :( Remove-Item $certificate -Force Throw "Unable to join: Provided certificate is for AAD Registered device." } # Generate P2P cert and CA & import to correct stores Write-Verbose "Generating P2P certificate & CA" New-P2PDeviceCertificate -PfxFileName $PfxFileName -TenantId $tenantId -DeviceName (Get-ComputerName) $P2P = Import-PfxCertificate -FilePath ".\$($deviceId)-P2P.pfx" -CertStoreLocation "Cert:\LocalMachine\My" -Exportable Write-Verbose "Certificate ($($P2P.Subject)) imported to CERT:\LocalMachine\My\$($P2P.Thumbprint)" if(-not (Test-Path "Cert:\LocalMachine\AAD Token Issuer")) { New-Item -Path "Cert:\LocalMachine" -Name "AAD Token Issuer" -ItemType "directory" -Force } $P2PCA = Import-Certificate -FilePath ".\$($deviceId)-P2P-CA.der" -CertStoreLocation "Cert:\LocalMachine\AAD Token Issuer" Write-Verbose "Certificate ($($P2PCA.Subject)) imported to CERT:\LocalMachine\AAD Token Issuer\$($P2PCA.Thumbprint)" # Generate the transport key using device id as name if($TransportKeyFileName) { # Use the provided tkpriv $tkPEM = (Get-Content $TransportKeyFileName) -join "`n" $tkParameters = Convert-PEMToRSA -PEM $tkPEM } else { # Use dkpriv from the certificate $tkParameters = $certificate.PrivateKey.ExportParameters($true) } $transportKeyName = $deviceId $RSAFULLPRIVATEBLOB = New-KeyBLOB -Parameters $tkParameters -Type RSA3 $cngParameters=[System.Security.Cryptography.CngKeyCreationParameters]::new() $cngParameters.KeyCreationOptions = 0x20 -bor 0x80 # Create machine key | overwrite $cngParameters.Parameters.Add([System.Security.Cryptography.CngProperty]::new("Length",[System.BitConverter]::GetBytes(2048),"None")) $cngParameters.Parameters.Add([System.Security.Cryptography.CngProperty]::new("RSAFULLPRIVATEBLOB",$RSAFULLPRIVATEBLOB,"None")) $cngParameters.ExportPolicy = 0x01 -bor 0x02 # Allow export, allow plaintext export $transportKey = [System.Security.Cryptography.CngKey]::Create("RSA",$transportKeyName,$cngParameters) Write-Verbose "TransportKey name: $($transportKey.KeyName)" Write-Verbose "TransportKey file name: $($transportKey.UniqueName)" # Copy the private key to SystemKeys folder & delete from the current location Copy-Item -Path "$env:ALLUSERSPROFILE\Microsoft\Crypto\Keys\$($transportKey.UniqueName)" -Destination "$env:ALLUSERSPROFILE\Microsoft\Crypto\SystemKeys" -Force Write-Verbose "Transport key stored to $env:ALLUSERSPROFILE\Microsoft\Crypto\SystemKeys\$($transportKey.UniqueName)" $transportKey.Delete() # Create the registry keys $CloudDomainJoinRoot = "HKLM:\SYSTEM\CurrentControlSet\Control\CloudDomainJoin" New-Item -Path "$CloudDomainJoinRoot" -Name "JoinInfo" -Force | Out-Null New-Item -Path "$CloudDomainJoinRoot\JoinInfo" -Name $thumbprint -Force | Out-Null New-Item -Path "$CloudDomainJoinRoot" -Name "TenantInfo" -Force | Out-Null New-Item -Path "$CloudDomainJoinRoot\TenantInfo" -Name $TenantId -Force | Out-Null # Set join info $joinInfo = @{ "IdpDomain" = "login.windows.net" "TenantId" = $TenantId "UserEmail" = $UserPrincipalName "AttestationLevel" = 0 "AikCertStatus" = 0 "TransportKeyStatus" = 0 "DeviceDisplayName" = Get-ComputerName "OsVersion" = $OSVersion "DdidUpToDate" = 0 "LastSyncTime" = [int]((Get-Date).ToUniversalTime()-$epoch).TotalSeconds } Write-Verbose "Created key $CloudDomainJoinRoot\JoinInfo\$thumbprint" foreach($key in $joinInfo.Keys) { Set-ItemProperty -Path "$CloudDomainJoinRoot\JoinInfo\$thumbprint" -Name $key -Value $joinInfo[$key] | Out-Null Write-Verbose " $key = $($joinInfo[$key])" } # Set tenant info $tenantInfo = @{ "DisplayName" = $UserPrincipalName.split("@")[1].Split(".")[0] "MdmEnrollmentUrl" = "" "MdmTermsOfUseUrl" = "" "MdmComplianceUrl" = "" "UserSettingSyncUrl" = "" "DrsServiceVersion" = "1.0" "DrsEndpoint" = "https://enterpriseregistration.windows.net/EnrollmentServer/DeviceEnrollmentWebService.svc" "DrsResourceId" = "urn:ms-drs:enterpriseregistration.windows.net" "AuthCodeUrl" = "https://login.microsoftonline.com/$tenantId/oauth2/authorize" "AccessTokenUrl" = "https://login.microsoftonline.com/$tenantId/oauth2/token" "CdjServiceVersion" = "2.0" "CdjEndpoint" = "https://enterpriseregistration.windows.net/EnrollmentServer/device/" "CdjResourceId" = "urn:ms-drs:enterpriseregistration.windows.net" "NgcServiceVersion" = "1.0" "NgcEndpoint" = "https://enterpriseregistration.windows.net/EnrollmentServer/key/" "NgcResourceId" = "urn:ms-drs:enterpriseregistration.windows.net" "WebAuthnServiceVersion" = "1.0" "WebAuthnEndpoint" = "https://enterpriseregistration.windows.net/webauthn/$tenantId/" "WebAuthnResourceId" = "urn:ms-drs:enterpriseregistration.windows.net" "DeviceManagementServiceVersion" = "1.0" "DeviceManagementEndpoint" = "https://enterpriseregistration.windows.net/manage/$tenantId/" "DeviceManagementResourceId" = "urn:ms-drs:enterpriseregistration.windows.net" "RbacPolicyEndpoint" = "https://pas.windows.net" } Write-Verbose "Created key $CloudDomainJoinRoot\TenantInfo\$tenantId" foreach($key in $tenantInfo.Keys) { Set-ItemProperty -Path "$CloudDomainJoinRoot\TenantInfo\$tenantId" -Name $key -Value $tenantInfo[$key] | Out-Null Write-Verbose " $key = $($tenantInfo[$key])" } # Calculate registry key parts for transportkey $idp = Convert-ByteArrayToHex -Bytes ($sha256.ComputeHash([text.encoding]::Unicode.GetBytes("login.windows.net"))) $tenant = Convert-ByteArrayToHex -Bytes ($sha256.ComputeHash([text.encoding]::Unicode.GetBytes($TenantId))) # Set the transport key name New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Cryptography\Ngc\KeyTransportKey\PerDeviceKeyTransportKey" -Name "" -Force | Out-Null New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Cryptography\Ngc\KeyTransportKey\PerDeviceKeyTransportKey\$idp" -Name $tenant -Force | Out-Null Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Cryptography\Ngc\KeyTransportKey\PerDeviceKeyTransportKey\$idp\$tenant" -Name "SoftwareKeyTransportKeyName" -Value $transportKeyName -Force | Out-Null Write-Verbose "Transport key set: HKLM:\SYSTEM\CurrentControlSet\Control\Cryptography\Ngc\KeyTransportKey\PerDeviceKeyTransportKey\$idp\$tenant\SoftwareKeyTransportKeyName = $transportKeyName" # Set some registry values Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\IdentityStore\LoadParameters\{B16898C6-A148-4967-9171-64D755DA8520}" -Name "LoginUri" -Value "https://login.microsoftonline.com" -Force | Out-Null Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\IdentityStore\LoadParameters\{B16898C6-A148-4967-9171-64D755DA8520}" -Name "Enabled" -Value 1 | Out-Null Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Provisioning\AutopilotPolicy" -Name "AutopilotMode" -Value 0 -Force | Out-Null # Restart Software Protection Platform Start-ScheduledTask -TaskPath "\Microsoft\Windows\SoftwareProtectionPlatform\" -TaskName "SvcRestartTask" Write-Verbose "Restarted Software Protection Platform task." # Enable and start AAD Device-Sync Enable-ScheduledTask -TaskPath "\Microsoft\Windows\Workplace Join\" -TaskName "Device-Sync" | Out-Null Start-ScheduledTask -TaskPath "\Microsoft\Windows\Workplace Join\" -TaskName "Device-Sync" Write-Verbose "Enabled and started Device-Sync task." # Run RegisterDeviceProtectionStateChanged Start-ScheduledTask -TaskPath "\Microsoft\Windows\DeviceDirectoryClient\" -TaskName "RegisterDeviceProtectionStateChanged" Write-Verbose "Ran RegisterDeviceProtectionStateChanged task." Write-Host "Device configured. To confirm success, restart and run: dsregcmd /status" } End { $sha256.Dispose() } } # Gets the join info of the local device # Dec 23rd 2021 function Get-LocalDeviceJoinInfo { <# .SYNOPSIS Shows the Azure AD Join information of the local device. .DESCRIPTION Shows the Azure AD Join information of the local device. .Example PS C\:>Get-AADIntLocalDeviceJoinInfo JoinType : Joined RegistryRoot : HKLM:\SYSTEM\CurrentControlSet\Control\CloudDomainJoin CertThumb : CEC55C2566633AC8DA3D9E3EAD98A599084D0C4C CertPath : Cert:\LocalMachine\My\CEC55C2566633AC8DA3D9E3EAD98A599084D0C4C TenantId : afdb4be1-057f-4dc1-98a9-327ffa079cca DeviceId : f4a4ea70-b196-4305-9531-018c3bcfc112 ObjectId : d625e2e9-8465-4513-b6c9-8d34a3735d41 KeyName : 8bff0b7f02f6256b521de95a77d4e70d_934bc9f7-04ef-43d8-a343-610b736a4030 KeyFriendlyName : Device Identity Key IdpDomain : login.windows.net UserEmail : JohnD@company.com AttestationLevel : 0 AikCertStatus : 0 TransportKeyStatus : 0 DeviceDisplayName : WIN-JohnD OsVersion : 10.0.19044.1288 DdidUpToDate : 0 LastSyncTime : 1643370347 .Example PS C\:>Get-AADIntLocalDeviceJoinInfo WARNING: This device has a TPM, exporting keys probably does not work! JoinType : Joined RegistryRoot : HKLM:\SYSTEM\CurrentControlSet\Control\CloudDomainJoin CertThumb : FFDABA36622C66F1F9104703D77603AE1964E92B CertPath : Cert:\LocalMachine\My\FFDABA36622C66F1F9104703D77603AE1964E92B TenantId : afdb4be1-057f-4dc1-98a9-327ffa079cca DeviceId : e4c56ee8-419a-4421-bff4-1d3cb1c85ead ObjectId : b62a31e9-8268-485f-aba8-69696cdf3048 KeyName : C:\ProgramData\Microsoft\Crypto\PCPKSP\[redacted]\[redacted].PCPKEY KeyFriendlyName : Device Identity Key IdpDomain : login.windows.net UserEmail : package_c1b50acc-82f6-4a19-ba87-e62e5f7fbeee@company.com AttestationLevel : 0 AikCertStatus : 0 TransportKeyStatus : 3 DeviceDisplayName : cloudpc-80153 OsVersion : 10.0.19044.1469 DdidUpToDate : 0 LastSyncTime : 1643622945 #> [CmdletBinding()] param() Process { $AADJoinRoot = "HKLM:\SYSTEM\CurrentControlSet\Control\CloudDomainJoin" $AADRegisteredRoot = "HKCU:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WorkplaceJoin" # Check the join type and construct return value if(Test-Path -Path "$AADJoinRoot\JoinInfo") { $joinRoot = $AADJoinRoot $certRoot = "LocalMachine" $attributes = [ordered]@{ "JoinType" = "Joined" "RegistryRoot" = $AADJoinRoot } } elseif(Test-Path -Path "$AADRegisteredRoot\JoinInfo") { $joinRoot = $AADRegisteredRoot $certRoot = "CurrentUser" $attributes = [ordered]@{ "JoinType" = "Registered" "RegistryRoot" = $AADRegisteredRoot } } else { return $null } # Get the Device certificate thumbnail from registery (assuming the device can only be joined once) $regItem = (Get-ChildItem -Path "$joinRoot\JoinInfo\").Name $certThumbnail = $regItem.Substring($regItem.LastIndexOf("\")+1) $certificate = Get-Item -Path "Cert:\$certRoot\My\$certThumbnail" $oids = Parse-CertificateOIDs -Certificate $certificate $attributes["CertThumb" ] = "$certThumbnail" $attributes["CertPath" ] = "Cert:\$certRoot\My\$certThumbnail" $attributes["TenantId" ] = $oids.TenantId $attributes["DeviceId" ] = $oids.DeviceId $attributes["ObjectId" ] = $oids.ObjectId # This will fail for DeviceTransportKey because running as Local System try { $attributes["KeyName" ] = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPrivateKey($certificate).key.uniquename $attributes["KeyFriendlyName"] = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPrivateKey($certificate).key.uipolicy.FriendlyName } catch { # Okay } # Read the join info $regItem = Get-Item -Path "$joinRoot\JoinInfo\$certThumbnail" $valueNames = $regItem.GetValueNames() foreach($name in $valueNames) { $attributes[$name] = $regItem.GetValue($name) } # Check the TPM if($attributes["TransportKeyStatus"] -eq 3) { Write-Warning "Transport key stored to TPM, exporting not possible!" } return New-Object psobject -Property $attributes } } |