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SafeGuard Easy
Tools guide
Product version:
Document date:
7
December 2014
2
Contents
Tools guide
1 About this guide
This guide explains the use of the encryption tools provided for Sophos SafeGuard (SafeGuard
Easy) protected endpoints.
You can find the tools in the Tools directory of your Sophos SafeGuard software delivery. The following tools are provided:
■
SGNState - display system status
■
SGNRollback tool - revert unsuccessful installations
■
■
KeyRecovery tool RecoverKeys.exe - recover access to computers when the POA is corrupt
Restore tool be_restore.exe - restore the system (Master Boot Record)
■
Decommissioning tool beinvvol.exe - decommission encrypted volumes
■
Decommissioning tool opalinvdisk.exe - decommission self-encrypting Opal-compliant hard drives
Intended audience
The intended audience for this guide are administrators working with Sophos SafeGuard as security officers.
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SafeGuard Easy
2 Displaying the system status with
SGNState
Sophos SafeGuard offers the command-line tool SGNState for displaying information about the current status (encryption status and further detailed status information) of the Sophos SafeGuard installation on an endpoint.
Reporting
SGNState
can also be used as follows:
■
The
SGNState
return code can be evaluated on the server using third-party management tools.
■
SGNState /LD
returns output that is formatted for LANDesk which can be saved to a file.
Parameters
You can call SGNState with the following parameters:
SGNState [/?|H] [H/Type|Status] [/L] [/LD]
■
Parameter
/?
returns help information about the available SGNState command-line parameters.
■
Parameter
/H Type
returns help information about drive types.
■
Parameter
/H Status
returns help information about drive status.
■
Parameter
/L
shows the following information:
Operating system
Product version
Encryption type [SGN | Opal | BitLocker | BitLocker-C/R | unknown or earlier version of
SGN]
Power On Authentication [yes | no | n/a]
WOL (Wake on LAN status) [yes | no | n/a]
Server name
Second Server name
Logon mode [SGN, no automatic logon | UID/PW | TOKEN/PIN | FINGERPRINT | BL
(BitLocker)]
Client activation state [ENTERPRISE | OFFLINE]
Last data replication [date, time]
Enforced cert-based token logon in POA [yes | no | n/a]
Return code [return code]
Volume info:
Tools guide
Name Type
<name> [HD-Part | ...]
...
FLOPPY
REMOV.PART
REM_PART
HD-PART
UNKNOWN
Status
[encrypted | not encrypted | ...]
...
not accessible stopped because of a failure encryption starting encryption in progress decryption starting decryption in progress not prepared
Algorithm
[<algorithm name> | n/a | ...]
■
Parameter
/LD
returns this information formatted for LANDesk.
The output is similar to the output of
/L
, but each line begins with Sophos SafeGuard:
Sophos SafeGuard - Encryption state <name> = [ encrypted | not encrypted | not prepared...]
...
■
Return code:
Bit 0: at least one volume is encrypted
Bit 1: encryption/decryption in progress
0 : no volume has been encrypted
-1 : an error has occurred (for example, no Sophos SafeGuard device encryption is installed)
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SafeGuard Easy
3 Reverting an unsuccessful installation with SGNRollback
Note: SGNRollback should only be used with Windows 7 without BitLocker.
If there is an unsuccessful attempt to install Sophos SafeGuard on an endpoint, the computer may be unable to boot and may be inaccessible for remote administration.
SGNRollback can repair an unsuccessful Sophos SafeGuard installation on an endpoint, if the following applies:
■
The Power-on Authentication freezes during the first startup and the computer can no longer boot.
■
The hard drive is not encrypted.
SGNRollback automatically reverts the effects of an unsuccessful installation of Sophos SafeGuard by
■
Enabling the blocked computer to boot,
■
Removing Sophos SafeGuard and
■
Undoing any modifications to other operating system components.
Start SGNRollback from a Windows-based recovery system, either WindowsPE or BartPE.
3.1 Prerequisites
Prerequisites for using SGNRollback:
■
SGNRollback works on the recovery systems WinPE and BartPE. To be able to use
SGNRollback for recovery, integrate it into the required recovery system. Please see the relevant recovery system documentation for further information.
If SGNRollback is to be started by autorun, the administrator using SGNRollback has to define the relevant settings in WinPE as described in
Enabling SGNRollback autostart for Windows
PE (page 7) or in BartPE as described in Enabling SGNRollback autostart for BartPE (page
7).
■
Sophos SafeGuard full disk encryption is installed.
Note:
Migration from SafeGuard Easy 4.x to Sophos SafeGuard 5.5x or later is not supported.
Tools guide
3.2 Starting SGNRollback in the recovery system
You can start SGNRollback manually or add it to the recovery system autostart.
3.2.1 Enabling SGNRollback autostart for Windows PE
To enable SGNRollback autostart for Windows PE, install the Microsoft Windows Automated
Installation Kit. The Windows Preinstallation Environment User Guide describes how to build a
Windows PE environment and how to autostart an application.
3.2.2 Enabling SGNRollback autostart for BartPE
1. Use the BartPEBuilder version 3.1.3 or later to create a PE image. For further details, see the
BartPE documentation.
2. In the BartPE Builder, add the recovery tool folder in the Custom field.
3. Build the image.
4. Copy the file AutoRun0Recovery.cmd from the Sophos SafeGuard Media to the i386 folder of the BartPE-prepared Windows version.
5. Create an AutoRun0Recovery.cmd with the following two lines of text:
\Recovery\recovery.exe
exit
6. Run the PEBuilder tool from the command line:
Pebuilder -buildis
A new iso image is built which includes the autorun file.
7. Save the resulting image on recovery media.
When booting this image SGNRollback will start automatically.
3.3 Parameters
SGNRollback can be started with the following parameter:
-drv WinDrive
Indicates the letter of the drive the Sophos SafeGuard installation to be repaired is on. This parameter can only be used in recovery mode. It has to be used on multi-boot systems to indicate the correct drive.
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SafeGuard Easy
3.4 Reverting an unsuccessful installation
To revert the effects of an unsuccessful Sophos SafeGuard installation on an endpoint:
1. Start the computer from the recovery media containing the recovery system including
SGNRollback.
2. Start SGNRollback in the recovery system. If autorun applies, SGNRollback will start automatically. SGNRollback prepares the operating system for the uninstallation of Sophos
SafeGuard.
3. You are prompted to remove the recovery media. After you remove the media, the computer will be rebooted in the safe mode of the operating system.
All modifications are undone and Sophos SafeGuard is uninstalled.
Tools guide
4 Recovering access to computers with the
KeyRecovery tool
The KeyRecovery tool is used to regain access to a computer in a complex recovery situation, for example when the POA is corrupted and the computer needs to be started from the SafeGuard recovery disk. The tool is started in the context of a Challenge/Response procedure.
Note: You can find a detailed description of the tool in the SafeGuard Easy administrator help, section Challenge/Response using Virtual Clients.
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SafeGuard Easy
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5 Restoring Windows BIOS SafeGuard full disk encryption systems
Note: The following description applies to Windows BIOS endpoints with SafeGuard full disk encryption and SafeGuard Power-on Authentication.
Sophos SafeGuard encrypts files and drives transparently. Boot volumes can also be encrypted, so decryption functionalities such as code, encryption algorithms and encryption key must be available very early in the boot phase. Therefore encrypted information cannot be accessed if the crucial Sophos SafeGuard modules are unavailable or do not work.
5.1 Restoring a corrupted MBR
The Sophos SafeGuard Power-on Authentication is loaded from the MBR on a computer's hard disk. When the installation is done, Sophos SafeGuard saves a copy of the original - as it was before the Sophos SafeGuard installation - in its kernel and modifies the PBR loader from LBA
0. In its LBA 0, the modified MBR contains the address of the first sector of the Sophos SafeGuard kernel and its total size.
Problems with the MBR can be resolved using the Sophos SafeGuard restore tool
be_restore.exe
. This tool is a Win32 application and must run under Windows, not under
DOS.
A faulty MBR loader will mean an unbootable system. It can be restored in two ways:
■
Restoring the MBR from a backup.
■
Repairing the MBR.
To restore a corrupted MBR successfully, prepare as follows:
1. We recommend that you create a Windows PE (Preinstalled Environment) CD.
2. To use the restore tool
be_restore.exe
several additional files are required. You can find the tool and the required files in your Sophos SafeGuard program directory under
tools\KeyRecovery and restore
. Copy all files in this folder to a memory stick. Make sure that you store all of them together in the same folder on your memory stick. Otherwise the recovery tool will not start properly.
Note: In order to start
be_restore.exe
in a Windows PE environment, the Windows file
OLEDLG.dll is required. This file is not included in the
tools\KeyRecovery and restore
folder. Add this file from a Windows installation to the recovery tool folder on your recovery
CD.
3. If necessary, adjust the boot sequence in the BIOS and select the CD-ROM to be first.
Note: be_restore.exe
can only restore or repair the MBR on disk 0. If you use two hard disks and the system is booted from the other hard disk, the MBR cannot be restored or repaired. This also applies when using a removable hard disk.
Tools guide
5.2 Restoring a previously saved MBR backup
To restore a previously saved MBR backup, proceed as follows:
1. After the installation of Sophos SafeGuard on the endpoint, you are prompted to specify a file location for saving the MBR backup. This produces a 512 byte file with the file extension .BKN, which contains the MBR.
2. Copy this file to the folder on the memory stick in which the other extra Sophos SafeGuard files are located.
3. Now insert the Windows PE Boot CD into the drive, plug in the memory stick with the Sophos
SafeGuard files and switch the computer on to boot from the CD.
4. When the computer is ready, start the cmd-box, navigate to the directory on the memory stick where the Sophos SafeGuard files are located and run
be_restore.exe
.
5. Select Restore MBR to restore from a backup and select the .BKN file.
The tool now checks whether the selected .BKN file matches the computer and afterwards restores the saved MBR.
5.3 Repairing the MBR without backup
Even when there is no MBR backup file available locally,
be_restore.exe
can repair a damaged
MBR loader.
be_restore.exe
- Repair MBR locates the Sophos SafeGuard kernel on the hard disk, uses its address, and recreates the MBR loader.
This is highly advantageous, especially as there is no need for a computer-specific MBR backup file locally. However, it takes a little more time because the Sophos SafeGuard kernel on the hard disk is searched for.
To use the repair function, prepare as described in Restoring a corrupted MBR (page 10), but
select Repair MBR when running
be_restore.exe
.
If more than one kernel is found,
be_restore.exe
– Repair MBR uses the one with the most recent time stamp.
5.4 Partition table
Sophos SafeGuard allows the creation of new primary or extended partitions. This changes the partition table on the hard disk with the partition.
When restoring an MBR backup, the tool will determine that the current MBR contains different partition tables for the LBA 0 and the MBR backup file that is to be restored (*.BKN). In a dialog, the user can select which table to use.
5.4.1 Repairing an MBR with a corrupted partition table
A corrupted partition table may result in a non-bootable operating system after successful POA logon.
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SafeGuard Easy
You can resolve this problem by using
be_restore.exe
to restore a previously saved MBR or repair the MBR without an MBR backup.
If you have a backup, proceed as described for the Restore MBR option.
If you do not have a backup, do as follows:
1. Insert the Windows PE Boot CD into the drive, plug in the memory stick with the Sophos
SafeGuard files and switch the computer on to boot from the CD.
2. When the computer is ready, go to the command prompt, navigate to the directory on the memory stick where the Sophos SafeGuard files are located and run
be_restore.exe
3. Select Repair MBR. If
be_restore.exe
detects a difference between the partition table of the current MBR and the mirrored MBR, a dialog for selecting the partition table to be used is displayed.
The mirrored MBR is the original Microsoft MBR saved during the Sophos SafeGuard Client setup to enable you to restore it, for example if you uninstall the client. The partition table in this mirrored MBR is being kept up-to-date by Sophos SafeGuard, if any partition changes occur in Windows.
4. Select From Mirrored MBR.
Important:
Do not select From Current MBR. If you do, the corrupted partition table from the current
MBR will be used. Not only will the system in this case remain non-bootable, but also the mirrored MBR will be updated and therefore also corrupted.
5.5 Windows Disk Signature
Whenever Windows creates a file system for the first time on a hard disk, it creates a signature for the hard disk. This signature is saved in the hard disk's MBR at the Offsets 0x01B – 0x01BB.
Note that, for example, the logical drive letters of the hard disk depend on the Windows Disk
Signature.
Example: The Windows Administrator uses the Windows hard disk manager to change the logical drive letters of the drives C:, D:, and E: to C:, F:, and Q. This deletes the Windows Disk Signature from the hard disk's MBR. After the next startup process, Windows drops into a time-consuming hard disk scan mode and restores the list of drives. The result is that the three drives have their original drive letters C:, D: and E again.
Whenever that occurs under Sophos SafeGuard, Sophos SafeGuard's filter driver “BEFLT.sys” is not loaded. This makes the system unbootable: The computer shows a blue screen ‘STOP
0xED “Unmountable Boot Volume”.
To repair this under Sophos SafeGuard, the original Windows Disk Signature has to be restored in the hard disk's MBR.
This is done by
be_restore.exe.
Note: You should be very careful when using any other tool to repair the MBR. For example, an old MS DOS FDISK.exe, that you use to rewrite the MBR loader (“FDISK /MBR”) could create another MBR loader with no Windows Disk Signature. As well as deleting the Windows Disk
Signature, the "new" MBR loader created by an old tool might not be compatible with the hard disk sizes commonly used today. You should always use up-to-date versions of repair tools.
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Tools guide
6 Restoring Windows UEFI BitLocker systems
For restoring Windows UEFI BitLocker systems, Sophos offers the restore tool
BLCRBackupRestoren.exe
. With this tool, you can:
■
Back up BitLocker Challenge/Response-related data.
Note: This is only necessary if the automatic backup failed (log event 3071: "Key backup could not be saved to the specified network share.")
■
Manually restore a previously created backup and repair the NVRAM boot order.
Note: This is only necessary if you suspect that BitLocker Challenge/Response-related data was corrupted or deleted.
6.1 Starting the command line tool
Syntax
blcrbackuprestoren [-?] [-B [-T <Filepath>]] [-R [-K <Filename>] [-S
<Filename>]] [-I] [-D]
Options
■
-?
Display help
■
-B
Backup
■
-T <Filepath>
Optional existing Target Path
■
-R
Restore
■
-K <Filename>
Optional Key Path\Filename
The optional key file is the .BKN file that needs to be exported from the SafeGuard Management
Center. For further information, see
Restoring a previously saved MBR backup
(page 11). If
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SafeGuard Easy
BitLocker Challenge/Response-related data has been backed up successfully, option
-R
is sufficient.
■
-S <Filename>
Optional Source Path\Filename
■
-I
Install boot entry
■
-D
Delete boot entry
Note:
If the automatic restore fails, then, in order to use a backup file available on a recovery partition without a drive letter assigned, you need to
■
■ assign a drive letter to the recovery partition and then provide the fully-qualified path to the backup file.
There is always only one file:
<drive-letter>:\SOPHOS\<file name>.cps
.
Examples
■
Back up:
■
blcrbackuprestoren -b
creates an archive at the default location.
■
blcrbackuprestoren -b -T <USBStick:\Backup\
creates an archive on an external drive.
■
Restore:
■
blcrbackuprestoren -r
extracts the archive from the default location.
■
blcrbackuprestoren -r -k X:\example\example.BKN
extracts the archive from the default location and reconstructs key file.
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Tools guide
7 Decommissioning encrypted volumes
For Sophos SafeGuard-protected computers we provide the command-line tool
beinvvol.exe
which can be used to safely decommission encrypted volumes (hard disks, USB sticks etc.). Our command-line tool is based on DoD Standard 5220.22-M, which can be used to safely delete key stores. This standard consists of seven overwrite cycles with random and alternative patterns.
This command-line tool is intended to be used on computers for which the following applies:
■
Sophos SafeGuard is installed.
■
Some hard disk volumes have been encrypted.
You have to run this tool within a system where the Sophos SafeGuard encryption driver is not active. This is to prevent data from being decommissioned by accident. Otherwise, the tool does not work and an error message is displayed.
Note: We recommend that you start your system from an external medium like a Windows PE
CD and use the tool according to the instructions available in the command line help.
After the relevant target volumes have been decommissioned, they are no longer readable.
According to DoD Standard 5220.22-M, the command-line tool permanently purges the boot sectors and the Sophos SafeGuard Key Storage Areas (original KSA and backup) of each encrypted volume by overwriting them seven times. As the random Data Encryption keys of each volume are not backed up in the central database for Sophos SafeGuard Clients, the volumes are perfectly sealed afterwards. Even a security officer cannot regain access.
The command-line tool also displays information about the available volumes on screen. This includes, for example, the name of the volume, the size of the volume and information about boot sectors and KSAs. This information can optionally be stored in a file. The path to this file should, of course, point to a volume that is not being decommissioned.
Note: Data cannot be recovered after deletion.
7.1 Starting the command-line tool
Syntax
■
xl[volume]
List information for the target volume(s). If no target volume is specified, list information for all volumes.
■
xi<volume>
Invalidate the target volume(s), if fully encrypted. The target <volume> must be specified for this command.
■
<volume>
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SafeGuard Easy
Specify the target volume = {a, b, c, ..., z, *}, with <*> meaning all volumes.
Options
■
-g0
Disable logging mechanism.
■
-ga[file]
Logging mode -append. Append log entries at the end of the target log file or create it if it does not exist.
■
-
gt[file]
Logging mode -truncate. Truncate the target log file if it already exists or create it if it does not exist.
■
[file]
Specify the target log file. If not specified, the default target log file is "BEInvVol.log" at the current path. You must not specify the log file on the volume that is going to be invalidated.
■
-?, -h
Display help.
Examples
> beinvvol -h
> beinvvol xld
> beinvvol xle -gac:\subdir\file.log
> beinvvol xl* -gtc:\subdir\file.log
> beinvvol xif -gt"c:\my subdir\file.log"
> beinvvol xig -g0
> beinvvol xi*
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Tools guide
8 Decommissioning self-encrypting,
Opal-compliant hard drives
Self-encrypting hard drives offer hardware-based encryption of data when they are written to the hard disk. The Trusted Computing Group (TCG) has published the vendor-independent Opal standard for self-encrypting hard drives. Sophos SafeGuard supports the Opal standard and offers management of endpoints with self-encrypting, Opal-compliant hard drives.
For further information on Opal-compliant hard drives, see the SafeGuard Easy administrator
help, section Sophos SafeGuard and self-encrypting Opal-compliant hard drives.
For Sophos SafeGuard-protected computers we provide the command-line tool
opalinvdisk.exe
.
8.1 Prerequisites and recommendations
For using opalinvdisk.exe, the following prerequisites and recommendations apply:
■
Before you use opalinvdisk.exe, the Opal-compliant hard disk has to be decrypted with the
Sophos SafeGuard Decrypt command from the Windows Explorer context menu on the endpoint. For further information, see the SafeGuard Easy administrator help, section Enable
users to unlock Opal-compliant hard drives and the SafeGuard Easy user help, section System
Tray Icon and Explorer extensions on endpoints with Opal-compliant hard drives.
■
You need administrator rights.
■
We recommend that you use
opalinvdisk.exe
in a Windows PE environment.
■
The tool
opalinvdisk.exe
starts the optional service RevertSP with parameter
KeepGlobalRangeKey
set to
False
. The actual decommissioning procedure carried out by
RevertSP
depends on the specific hard drive. For further information, refer to section 5.2.3
of the Opal standard TCG Storage Security Subsystem Class: Opal, Specification Version
1.00, Revision 3.00, which is available at www.trustedcomputinggroup.org
.
8.2 Running opalinvdisk.exe
1. Open a command prompt and start
opalinvdisk.exe
with administrator rights.
Tool and usage information is displayed.
2. At the command prompt, enter
opalinvdisk.exe <TargetDevice>
.
For example:
opalinvdisk.exe PhysicalDrive0
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SafeGuard Easy
If the necessary prerequisites are fulfilled,
RevertSP
is started on the hard drive specified in
<TargetDevice>
. If the prerequisites are not fulfilled or the hard drive does not support RevertSP, an error message is displayed.
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Tools guide
9 Technical support
You can find technical support for Sophos products in any of these ways:
■
Visit the SophosTalk community at community.sophos.com/ and search for other users who are experiencing the same problem.
■
■
■
Visit the Sophos support knowledgebase at www.sophos.com/en-us/support.aspx
.
Download the product documentation at www.sophos.com/en-us/support/documentation/ .
Open a ticket with our support team at https://secure2.sophos.com/support/contact-support/support-query.aspx
.
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SafeGuard Easy
10 Legal notices
Copyright
©
1996 - 2014 Sophos Limited. All rights reserved. SafeGuard is a registered trademark of Sophos Limited and Sophos Group.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise unless you are either a valid licensee where the documentation can be reproduced in accordance with the license terms or you otherwise have the prior permission in writing of the copyright owner.
Sophos, Sophos Anti-Virus and SafeGuard are registered trademarks of Sophos Limited, Sophos
Group and Utimaco Safeware AG, as applicable. All other product and company names mentioned are trademarks or registered trademarks of their respective owners.
You find copyright information on third party suppliers in the Disclaimer and Copyright for 3rd
Party Software document in your product directory.
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