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windows/security/operating-system-security/data-protection/bitlocker/bitlocker-recovery-guide-plan.md
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@ -1,16 +1,16 @@
--- ---
title: BitLocker recovery guide title: BitLocker recovery guide
description: This article for IT professionals describes how to recover BitLocker keys from Active Directory Domain Services (AD DS). description: Learn how to recover BitLocker keys from Microsoft Entra ID and Active Directory Domain Services (AD DS).
ms.collection: ms.collection:
- highpri - highpri
- tier1 - tier1
ms.topic: conceptual ms.topic: howto
ms.date: 11/08/2022 ms.date: 09/29/2023
--- ---
# BitLocker recovery guide # BitLocker recovery guide
This article describes how to recover BitLocker keys from AD DS. This article describes how to recover BitLocker keys from Microsoft Entra ID and Active Directory Domain Services (AD DS).
Organizations can use BitLocker recovery information saved in Active Directory Domain Services (AD DS) to access BitLocker-protected data. It's recommended to create a recovery model for BitLocker while planning for BitLocker deployment. Organizations can use BitLocker recovery information saved in Active Directory Domain Services (AD DS) to access BitLocker-protected data. It's recommended to create a recovery model for BitLocker while planning for BitLocker deployment.
@ -369,7 +369,7 @@ There are rules governing which hint is shown during the recovery (in the order
#### Example 1 (single recovery key with single backup) #### Example 1 (single recovery key with single backup)
| Custom URL | Yes | | Custom URL | Yes |
|----------------------|------------| |----------------------------|-----|
| Saved to Microsoft Account | Yes | | Saved to Microsoft Account | Yes |
| Saved to Azure AD | No | | Saved to Azure AD | No |
| Saved to Active Directory | No | | Saved to Active Directory | No |
@ -383,7 +383,7 @@ There are rules governing which hint is shown during the recovery (in the order
#### Example 2 (single recovery key with single backup) #### Example 2 (single recovery key with single backup)
| Custom URL | Yes | | Custom URL | Yes |
|----------------------|------------| |----------------------------|-----|
| Saved to Microsoft Account | No | | Saved to Microsoft Account | No |
| Saved to Azure AD | No | | Saved to Azure AD | No |
| Saved to Active Directory | Yes | | Saved to Active Directory | Yes |
@ -397,7 +397,7 @@ There are rules governing which hint is shown during the recovery (in the order
#### Example 3 (single recovery key with multiple backups) #### Example 3 (single recovery key with multiple backups)
| Custom URL | No | | Custom URL | No |
|----------------------|------------| |----------------------------|-----|
| Saved to Microsoft Account | Yes | | Saved to Microsoft Account | Yes |
| Saved to Azure AD | Yes | | Saved to Azure AD | Yes |
| Saved to Active Directory | No | | Saved to Active Directory | No |
@ -411,7 +411,7 @@ There are rules governing which hint is shown during the recovery (in the order
#### Example 4 (multiple recovery passwords) #### Example 4 (multiple recovery passwords)
| Custom URL | No | | Custom URL | No |
|----------------------|-----------------| |----------------------------|----------|
| Saved to Microsoft Account | No | | Saved to Microsoft Account | No |
| Saved to Azure AD | No | | Saved to Azure AD | No |
| Saved to Active Directory | No | | Saved to Active Directory | No |
@ -420,11 +420,9 @@ There are rules governing which hint is shown during the recovery (in the order
| Creation time | **1PM** | | Creation time | **1PM** |
| Key ID | A564F193 | | Key ID | A564F193 |
<br>
<br>
| Custom URL | No | | Custom URL | No |
|----------------------|-----------------| |----------------------------|----------|
| Saved to Microsoft Account | No | | Saved to Microsoft Account | No |
| Saved to Azure AD | No | | Saved to Azure AD | No |
| Saved to Active Directory | No | | Saved to Active Directory | No |
@ -440,7 +438,7 @@ There are rules governing which hint is shown during the recovery (in the order
#### Example 5 (multiple recovery passwords) #### Example 5 (multiple recovery passwords)
| Custom URL | No | | Custom URL | No |
|----------------------|-----------------| |----------------------------|----------|
| Saved to Microsoft Account | Yes | | Saved to Microsoft Account | Yes |
| Saved to Azure AD | Yes | | Saved to Azure AD | Yes |
| Saved to Active Directory | No | | Saved to Active Directory | No |
@ -450,7 +448,7 @@ There are rules governing which hint is shown during the recovery (in the order
| Key ID | 99631A34 | | Key ID | 99631A34 |
| Custom URL | No | | Custom URL | No |
|----------------------|-----------------| |----------------------------|----------|
| Saved to Microsoft Account | No | | Saved to Microsoft Account | No |
| Saved to Azure AD | Yes | | Saved to Azure AD | Yes |
| Saved to Active Directory | No | | Saved to Active Directory | No |
@ -484,8 +482,6 @@ The recovery password and be invalidated and reset in two ways:
- **Use `manage-bde.exe`**: `manage-bde.exe` can be used to remove the old recovery password and add a new recovery password. The procedure identifies the command and the syntax for this method. - **Use `manage-bde.exe`**: `manage-bde.exe` can be used to remove the old recovery password and add a new recovery password. The procedure identifies the command and the syntax for this method.
- **Run a script**: A script can be run to reset the password without decrypting the volume. The sample script in the procedure illustrates this functionality. The sample script creates a new recovery password and invalidates all other passwords.
### Resetting a recovery password using `manage-bde.exe` ### Resetting a recovery password using `manage-bde.exe`
1. Remove the previous recovery password. 1. Remove the previous recovery password.
@ -514,466 +510,3 @@ The recovery password and be invalidated and reset in two ways:
> [!WARNING] > [!WARNING]
> The braces `{}` must be included in the ID string. > The braces `{}` must be included in the ID string.
### Running the sample recovery password script to reset the recovery passwords
1. Save the following sample script in a VBScript file. For example:
`ResetPassword.vbs`.
2. At the command prompt, enter the following command::
```cmd
cscript.exe ResetPassword.vbs
```
> [!IMPORTANT]
> This sample script is configured to work only for the C volume. If necessary, customize the script to match the volume where the password reset needs to be tested.
> [!NOTE]
> To manage a remote computer, specify the remote computer name rather than the local computer name.
The following sample VBScript can be used to reset the recovery passwords:
<br>
<details>
<summary>Expand to view sample recovery password VBscript to reset the recovery passwords</summary>
```vb
' Target drive letter
strDriveLetter = "c:"
' Target computer name
' Use "." to connect to the local computer
strComputerName = "."
' --------------------------------------------------------------------------------
' Connect to the BitLocker WMI provider class
' --------------------------------------------------------------------------------
strConnectionStr = "winmgmts:" _
& "{impersonationLevel=impersonate,authenticationLevel=pktPrivacy}!\\" _
& strComputerName _
& "\root\cimv2\Security\MicrosoftVolumeEncryption"
On Error Resume Next 'handle permission errors
Set objWMIService = GetObject(strConnectionStr)
If Err.Number <> 0 Then
WScript.Echo "Failed to connect to the BitLocker interface (Error 0x" & Hex(Err.Number) & ")."
Wscript.Echo "Ensure that you are running with administrative privileges."
WScript.Quit -1
End If
On Error GoTo 0
strQuery = "Select * from Win32_EncryptableVolume where DriveLetter='" & strDriveLetter & "'"
Set colTargetVolumes = objWMIService.ExecQuery(strQuery)
If colTargetVolumes.Count = 0 Then
WScript.Echo "FAILURE: Unable to find BitLocker-capable drive " & strDriveLetter & " on computer " & strComputerName & "."
WScript.Quit -1
End If
' there should only be one volume found
For Each objFoundVolume in colTargetVolumes
set objVolume = objFoundVolume
Next
' objVolume is now our found BitLocker-capable disk volume
' --------------------------------------------------------------------------------
' Perform BitLocker WMI provider functionality
' --------------------------------------------------------------------------------
' Add a new recovery password, keeping the ID around so it doesn't get deleted later
' ----------------------------------------------------------------------------------
nRC = objVolume.ProtectKeyWithNumericalPassword("Recovery Password Refreshed By Script", , sNewKeyProtectorID)
If nRC <> 0 Then
WScript.Echo "FAILURE: ProtectKeyWithNumericalPassword failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
' Removes the other, "stale", recovery passwords
' ----------------------------------------------------------------------------------
nKeyProtectorTypeIn = 3 ' type associated with "Numerical Password" protector
nRC = objVolume.GetKeyProtectors(nKeyProtectorTypeIn, aKeyProtectorIDs)
If nRC <> 0 Then
WScript.Echo "FAILURE: GetKeyProtectors failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
' Delete those key protectors other than the one we just added.
For Each sKeyProtectorID In aKeyProtectorIDs
If sKeyProtectorID <> sNewKeyProtectorID Then
nRC = objVolume.DeleteKeyProtector(sKeyProtectorID)
If nRC <> 0 Then
WScript.Echo "FAILURE: DeleteKeyProtector on ID " & sKeyProtectorID & " failed with return code 0x" & Hex(nRC)
WScript.Quit -1
Else
' no output
'WScript.Echo "SUCCESS: Key protector with ID " & sKeyProtectorID & " deleted"
End If
End If
Next
WScript.Echo "A new recovery password has been added. Old passwords have been removed."
' - some advanced output (hidden)
'WScript.Echo ""
'WScript.Echo "Type ""manage-bde.exe -protectors -get " & strDriveLetter & " -type recoverypassword"" to view existing passwords."
```
</details>
## Retrieving the BitLocker key package
Two methods can be used to retrieve the key package as described in [Using Additional Recovery Information](#using-additional-recovery-information):
- **Export a previously saved key package from AD DS.** Read access is required to BitLocker recovery passwords that are stored in AD DS.
- **Export a new key package from an unlocked, BitLocker-protected volume.** Local administrator access to the working volume is required before any damage occurred to the volume.
### Running the sample key package retrieval script that exports all previously saved key packages from AD DS
The following steps and sample script exports all previously saved key packages from AD DS.
1. Save the following sample script in a VBScript file. For example: `GetBitLockerKeyPackageADDS.vbs`.
2. At the command prompt, enter a command similar to the following sample script:
```cmd
cscript.exe GetBitLockerKeyPackageADDS.vbs -?
```
The following sample script can be used to create a VBScript file to retrieve the BitLocker key package from AD DS:
<br>
<details>
<summary>Expand to view sample key package retrieval VBscript that exports all previously saved key packages from AD DS</summary>
```vb
' --------------------------------------------------------------------------------
' Usage
' --------------------------------------------------------------------------------
Sub ShowUsage
Wscript.Echo "USAGE: GetBitLockerKeyPackageADDS [Path To Save Key Package] [Optional Computer Name]"
Wscript.Echo "If no computer name is specified, the local computer is assumed."
Wscript.Echo
Wscript.Echo "Example: GetBitLockerKeyPackageADDS E:\bitlocker-ad-key-package mycomputer"
WScript.Quit
End Sub
' --------------------------------------------------------------------------------
' Parse Arguments
' --------------------------------------------------------------------------------
Set args = WScript.Arguments
Select Case args.Count
Case 1
If args(0) = "/?" Or args(0) = "-?" Then
ShowUsage
Else
strFilePath = args(0)
' Get the name of the local computer
Set objNetwork = CreateObject("WScript.Network")
strComputerName = objNetwork.ComputerName
End If
Case 2
If args(0) = "/?" Or args(0) = "-?" Then
ShowUsage
Else
strFilePath = args(0)
strComputerName = args(1)
End If
Case Else
ShowUsage
End Select
' --------------------------------------------------------------------------------
' Get path to Active Directory computer object associated with the computer name
' --------------------------------------------------------------------------------
Function GetStrPathToComputer(strComputerName)
' Uses the global catalog to find the computer in the forest
' Search also includes deleted computers in the tombstone
Set objRootLDAP = GetObject("LDAP://rootDSE")
namingContext = objRootLDAP.Get("defaultNamingContext") ' e.g. string dc=fabrikam,dc=com
strBase = "<GC://" & namingContext & ">"
Set objConnection = CreateObject("ADODB.Connection")
Set objCommand = CreateObject("ADODB.Command")
objConnection.Provider = "ADsDSOOBject"
objConnection.Open "Active Directory Provider"
Set objCommand.ActiveConnection = objConnection
strFilter = "(&(objectCategory=Computer)(cn=" & strComputerName & "))"
strQuery = strBase & ";" & strFilter & ";distinguishedName;subtree"
objCommand.CommandText = strQuery
objCommand.Properties("Page Size") = 100
objCommand.Properties("Timeout") = 100
objCommand.Properties("Cache Results") = False
' Enumerate all objects found.
Set objRecordSet = objCommand.Execute
If objRecordSet.EOF Then
WScript.echo "The computer name '" & strComputerName & "' cannot be found."
WScript.Quit 1
End If
' Found object matching name
Do Until objRecordSet.EOF
dnFound = objRecordSet.Fields("distinguishedName")
GetStrPathToComputer = "LDAP://" & dnFound
objRecordSet.MoveNext
Loop
' Clean up.
Set objConnection = Nothing
Set objCommand = Nothing
Set objRecordSet = Nothing
End Function
' --------------------------------------------------------------------------------
' Securely access the Active Directory computer object using Kerberos
' --------------------------------------------------------------------------------
Set objDSO = GetObject("LDAP:")
strPathToComputer = GetStrPathToComputer(strComputerName)
WScript.Echo "Accessing object: " + strPathToComputer
Const ADS_SECURE_AUTHENTICATION = 1
Const ADS_USE_SEALING = 64 '0x40
Const ADS_USE_SIGNING = 128 '0x80
' --------------------------------------------------------------------------------
' Get all BitLocker recovery information from the Active Directory computer object
' --------------------------------------------------------------------------------
' Get all the recovery information child objects of the computer object
Set objFveInfos = objDSO.OpenDSObject(strPathToComputer, vbNullString, vbNullString, _
ADS_SECURE_AUTHENTICATION + ADS_USE_SEALING + ADS_USE_SIGNING)
objFveInfos.Filter = Array("msFVE-RecoveryInformation")
' Iterate through each recovery information object and saves any existing key packages
nCount = 1
strFilePathCurrent = strFilePath & nCount
For Each objFveInfo in objFveInfos
strName = objFveInfo.Get("name")
strRecoveryPassword = objFveInfo.Get("msFVE-RecoveryPassword")
strKeyPackage = objFveInfo.Get("msFVE-KeyPackage")
WScript.echo
WScript.echo "Recovery Object Name: " + strName
WScript.echo "Recovery Password: " + strRecoveryPassword
' Validate file path
Set fso = CreateObject("Scripting.FileSystemObject")
If (fso.FileExists(strFilePathCurrent)) Then
WScript.Echo "The file " & strFilePathCurrent & " already exists. Please use a different path."
WScript.Quit -1
End If
' Save binary data to the file
SaveBinaryDataText strFilePathCurrent, strKeyPackage
WScript.echo "Related key package successfully saved to " + strFilePathCurrent
' Update next file path using base name
nCount = nCount + 1
strFilePathCurrent = strFilePath & nCount
Next
'----------------------------------------------------------------------------------------
' Utility functions to save binary data
'----------------------------------------------------------------------------------------
Function SaveBinaryDataText(FileName, ByteArray)
'Create FileSystemObject object
Dim FS: Set FS = CreateObject("Scripting.FileSystemObject")
'Create text stream object
Dim TextStream
Set TextStream = FS.CreateTextFile(FileName)
'Convert binary data To text And write them To the file
TextStream.Write BinaryToString(ByteArray)
End Function
Function BinaryToString(Binary)
Dim I, S
For I = 1 To LenB(Binary)
S = S & Chr(AscB(MidB(Binary, I, 1)))
Next
BinaryToString = S
End Function
WScript.Quit
```
</details>
### Running the sample key package retrieval script that exports a new key package from an unlocked, encrypted volume
The following steps and sample script exports a new key package from an unlocked, encrypted volume.
1. Save the following sample script in a VBScript file. For example: `GetBitLockerKeyPackage.vbs`
2. Open an administrator command prompt, and then enter a command similar to the following sample script:
```cmd
cscript.exe GetBitLockerKeyPackage.vbs -?
```
<br>
<details>
<summary>Expand to view sample VBscript that exports a new key package from an unlocked, encrypted volume</summary>
```vb
' --------------------------------------------------------------------------------
' Usage
' --------------------------------------------------------------------------------
Sub ShowUsage
Wscript.Echo "USAGE: GetBitLockerKeyPackage [VolumeLetter/DriveLetter:] [Path To Save Key Package]"
Wscript.Echo
Wscript.Echo "Example: GetBitLockerKeyPackage C: E:\bitlocker-backup-key-package"
WScript.Quit
End Sub
' --------------------------------------------------------------------------------
' Parse Arguments
' --------------------------------------------------------------------------------
Set args = WScript.Arguments
Select Case args.Count
Case 2
If args(0) = "/?" Or args(0) = "-?" Then
ShowUsage
Else
strDriveLetter = args(0)
strFilePath = args(1)
End If
Case Else
ShowUsage
End Select
' --------------------------------------------------------------------------------
' Other Inputs
' --------------------------------------------------------------------------------
' Target computer name
' Use "." to connect to the local computer
strComputerName = "."
' Default key protector ID to use. Specify "" to let the script choose.
strDefaultKeyProtectorID = ""
' strDefaultKeyProtectorID = "{001298E0-870E-4BA0-A2FF-FC74758D5720}" ' sample
' --------------------------------------------------------------------------------
' Connect to the BitLocker WMI provider class
' --------------------------------------------------------------------------------
strConnectionStr = "winmgmts:" _
& "{impersonationLevel=impersonate,authenticationLevel=pktPrivacy}!\\" _
& strComputerName _
& "\root\cimv2\Security\MicrosoftVolumeEncryption"
On Error Resume Next 'handle permission errors
Set objWMIService = GetObject(strConnectionStr)
If Err.Number <> 0 Then
WScript.Echo "Failed to connect to the BitLocker interface (Error 0x" & Hex(Err.Number) & ")."
Wscript.Echo "Ensure that you are running with administrative privileges."
WScript.Quit -1
End If
On Error GoTo 0
strQuery = "Select * from Win32_EncryptableVolume where DriveLetter='" & strDriveLetter & "'"
Set colTargetVolumes = objWMIService.ExecQuery(strQuery)
If colTargetVolumes.Count = 0 Then
WScript.Echo "FAILURE: Unable to find BitLocker-capable drive " & strDriveLetter & " on computer " & strComputerName & "."
WScript.Quit -1
End If
' there should only be one volume found
For Each objFoundVolume in colTargetVolumes
set objVolume = objFoundVolume
Next
' objVolume is now our found BitLocker-capable disk volume
' --------------------------------------------------------------------------------
' Perform BitLocker WMI provider functionality
' --------------------------------------------------------------------------------
' Collect all possible valid key protector ID's that can be used to get the package
' ----------------------------------------------------------------------------------
nNumericalKeyProtectorType = 3 ' type associated with "Numerical Password" protector
nRC = objVolume.GetKeyProtectors(nNumericalKeyProtectorType, aNumericalKeyProtectorIDs)
If nRC <> 0 Then
WScript.Echo "FAILURE: GetKeyProtectors failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
nExternalKeyProtectorType = 2 ' type associated with "External Key" protector
nRC = objVolume.GetKeyProtectors(nExternalKeyProtectorType, aExternalKeyProtectorIDs)
If nRC <> 0 Then
WScript.Echo "FAILURE: GetKeyProtectors failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
' Get first key protector of the type "Numerical Password" or "External Key", if any
' ----------------------------------------------------------------------------------
if strDefaultKeyProtectorID = "" Then
' Save first numerical password, if exists
If UBound(aNumericalKeyProtectorIDs) <> -1 Then
strDefaultKeyProtectorID = aNumericalKeyProtectorIDs(0)
End If
' No numerical passwords exist, save the first external key
If strDefaultKeyProtectorID = "" and UBound(aExternalKeyProtectorIDs) <> -1 Then
strDefaultKeyProtectorID = aExternalKeyProtectorIDs(0)
End If
' Fail case: no recovery key protectors exist.
If strDefaultKeyProtectorID = "" Then
WScript.Echo "FAILURE: Cannot create backup key package because no recovery passwords or recovery keys exist. Check that BitLocker protection is on for this drive."
WScript.Echo "For help adding recovery passwords or recovery keys, enter ""manage-bde.exe -protectors -add -?""."
WScript.Quit -1
End If
End If
' Get some information about the chosen key protector ID
' ----------------------------------------------------------------------------------
' is the type valid?
nRC = objVolume.GetKeyProtectorType(strDefaultKeyProtectorID, nDefaultKeyProtectorType)
If Hex(nRC) = "80070057" Then
WScript.Echo "The key protector ID " & strDefaultKeyProtectorID & " is not valid."
WScript.Echo "This ID value may have been provided by the script writer."
ElseIf nRC <> 0 Then
WScript.Echo "FAILURE: GetKeyProtectorType failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
' what's a string that can be used to describe it?
strDefaultKeyProtectorType = ""
Select Case nDefaultKeyProtectorType
Case nNumericalKeyProtectorType
strDefaultKeyProtectorType = "recovery password"
Case nExternalKeyProtectorType
strDefaultKeyProtectorType = "recovery key"
Case Else
WScript.Echo "The key protector ID " & strDefaultKeyProtectorID & " does not refer to a valid recovery password or recovery key."
WScript.Echo "This ID value may have been provided by the script writer."
End Select
' Save the backup key package using the chosen key protector ID
' ----------------------------------------------------------------------------------
nRC = objVolume.GetKeyPackage(strDefaultKeyProtectorID, oKeyPackage)
If nRC <> 0 Then
WScript.Echo "FAILURE: GetKeyPackage failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
' Validate file path
Set fso = CreateObject("Scripting.FileSystemObject")
If (fso.FileExists(strFilePath)) Then
WScript.Echo "The file " & strFilePath & " already exists. Please use a different path."
WScript.Quit -1
End If
Dim oKeyPackageByte, bKeyPackage
For Each oKeyPackageByte in oKeyPackage
'WScript.echo "key package byte: " & oKeyPackageByte
bKeyPackage = bKeyPackage & ChrB(oKeyPackageByte)
Next
' Save binary data to the file
SaveBinaryDataText strFilePath, bKeyPackage
' Display helpful information
' ----------------------------------------------------------------------------------
WScript.Echo "The backup key package has been saved to " & strFilePath & "."
WScript.Echo "IMPORTANT: To use this key package, the " & strDefaultKeyProtectorType & " must also be saved."
' Display the recovery password or a note about saving the recovery key file
If nDefaultKeyProtectorType = nNumericalKeyProtectorType Then
nRC = objVolume.GetKeyProtectorNumericalPassword(strDefaultKeyProtectorID, sNumericalPassword)
If nRC <> 0 Then
WScript.Echo "FAILURE: GetKeyProtectorNumericalPassword failed with return code 0x" & Hex(nRC)
WScript.Quit -1
End If
WScript.Echo "Save this recovery password: " & sNumericalPassword
ElseIf nDefaultKeyProtectorType = nExternalKeyProtectorType Then
WScript.Echo "The saved key file is named " & strDefaultKeyProtectorID & ".BEK"
WScript.Echo "For help re-saving this external key file, enter ""manage-bde.exe -protectors -get -?"""
End If
'----------------------------------------------------------------------------------------
' Utility functions to save binary data
'----------------------------------------------------------------------------------------
Function SaveBinaryDataText(FileName, ByteArray)
'Create FileSystemObject object
Dim FS: Set FS = CreateObject("Scripting.FileSystemObject")
'Create text stream object
Dim TextStream
Set TextStream = FS.CreateTextFile(FileName)
'Convert binary data To text And write them To the file
TextStream.Write BinaryToString(ByteArray)
End Function
Function BinaryToString(Binary)
Dim I, S
For I = 1 To LenB(Binary)
S = S & Chr(AscB(MidB(Binary, I, 1)))
Next
BinaryToString = S
End Function
```
</details>
## Related articles
- [BitLocker overview](index.md)