46
EnCase Forensic Version 6.11 Userʹs Guide
Introduction
The LinEn™ utility runs on the Linux operating system and facilitates the following functions:
Performing drive‐to‐drive acquisitions
Performing crossover acquisitions
LinEn runs independently of the Linux operating system thus improving acquisition speeds, and
runs in 32‐bit mode (rather than 16‐bit mode). Because Linux provides greater device support,
LinEn can acquire data from a larger set of devices.
As with other operating systems, to prevent inadvertent disk writes, modifications to the
operating system need to be made. Linux typically has a feature called autofs installed by
default. This feature automatically mounts, and thus writes to, any medium attached to the
computer. Instructions in this chapter describe how to disable this feature to protect the integrity
of your evidence.
Viewing the License for LinEn
LinEn must be running, and you must be on the LinEn main screen.
To view the license for LinEn:
1.
Press L.
The license displays.
2.
Press Enter.
The LinEn main screen displays.
Using LinEn
47
Creating a LinEn Boot Disc
If you want to run LinEn on the subject machine, you need to create a LinEn boot disc. When
you create a LinEn boot disc, it is important to choose a ʺLiveʺ Linux distribution, as these types
of distributions are designed to run straight from the CD or DVD and do not install themselves
on the subject machine.
You must have an ISO image of the live Linux distribution you want to use, such as Knoppix.
Knoppix is one of the popular live distributions.
Note: As it is not practical to modify the settings of a live Linux distribution, ensure that the live distribution
does not automatically mount detected devices.
To create a LinEn Boot disc
1.
Using your EnCase application on the investigatorʹs machine, click Tools > Create Boot
Disc.
The Choose Destination page of the Create Boot Disk wizard displays.
2.
Click ISO Image, and click Next.
The Formatting Options page of the Create Boot Disk wizard displays.
3.
Provide a path and filename to the ISO image you downloaded earlier, optionally click
Alter Boot Table, and click Next.
The Copy Files page of the Create Book Disk wizard displays.
4.
Right‐click in the right pane of the Copy Files page, and click New.
The file browser opens.
5.
Enter or select the path to the LinEn executable, normally
c:\program
files\encase6\linen
, click OK, then click Finish.
The Creating ISO progress bar displays on the Copy Files page. Once the modified ISO
file is created, the wizard closes.
6.
Burn the ISO file onto a blank CD/DVD using the burning software of your choice. For
help with this, refer to the instructions that came with your software.
You now have a boot disc to run Linux and LinEn while you acquire the subject Linux device.
48
EnCase Forensic Version 6.11 Userʹs Guide
Configuring Your Linux Distribution
Before LinEn can run on Linux, you must configure Linux distribution. Due to the nature of
Linux and its distributions, only the following standard distributions are discussed:
SUSE 9.1
Red Hat
Knoppix
Note: Because of the dynamic nature of Linux distributions, It is recommended that you validate your Linux
environment before using it in the field.
The process describes an ideal setup process that effectively runs the LinEn application in a
forensically sound manner.
Many distributions provide autofs as the means auto‐mounting anything attached to the Linux
system. It is essential that autofs is disabled to prevent auto‐mounting.
Obtaining a Linux Distribution
A Linux distribution can be obtained from any Linux vendor.
If you intend to use a LinEn boot disc, you will need a live distribution, such as Knoppix, in
order to create a boot disc. If you intend to run LinEn on a installed version of Linux on your
forensic machine, we recommend using SUSE or Red Hat.
For the Linux distributions discussed in relation to LinEn, obtain a distribution from one of the
following:
For the latest SUSE distribution, go to the http://www.novell.com/linux/
(http://www.novell.com/linux/) website.
For the latest Red Hat distribution, go to the http://www.redhat.com/
(http://www.redhat.com/) website.
For the latest Knoppix distribution, go to the http://knoppix.com/ (http://knoppix.com/)
website.
Using LinEn
49
LinEn Set Up Under SUSE
You must already have SUSE installed on your Linux machine.
1.
Copy the LinEn executable from
C:\Program Files\EnCase6
on your Windows
machine to the desired directory,
/usr/local/encase
on your Linux machine.
2.
Open a command shell on your Linux machine.
3.
Enter
chmod 777/usr/local/encase/linen
. This changes the permissions on the
LinEn executable, so that it can be executed by everyone.
4.
Close the command shell.
5.
Click Main Menu > System > Configuration > YaST. Yet Another Setup Tool (YaST) is
used to configure various settings for your Linux operating system.
6.
Open the Runlevel Editor.
7.
Ensure that autofs is disabled
LinEn Set Up Under Red Hat
You must have Red Hat installed on your Linux machine.
1.
Copy the LinEn executable from
C:\Program Files\EnCase6
on your Windows
machine to the desired directory,
/usr/local/encase
on your Linux machine.
2.
Open a command shell on your Linux machine.
3.
Enter
chmod 777/usr/local/encase/linen
. This changes the permissions on the
LinEn executable, so that it can be executed by anyone.
4.
Close the command shell.
5.
Click Main Menu > System Settings > Server Settings.
6.
Ensure that the autofs is disabled.
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