321 lines
4.7 KiB
HTML
321 lines
4.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Creating the encrypted root filesystem</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Encrypted Root Filesystem HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Preparing the system"
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HREF="preparing-system.html"><LINK
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REL="NEXT"
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TITLE="Setting up the boot device"
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HREF="setup-boot-device.html"></HEAD
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><BODY
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CLASS="sect1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Encrypted Root Filesystem HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="preparing-system.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="setup-boot-device.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="encrypt-root-filesystem"
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></A
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>2. Creating the encrypted root filesystem</H1
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><P
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> Fill the target partition with random data:
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>shred -n 1 -v /dev/hda2</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> Setup the encrypted loopback device:
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>losetup -e aes256 -S xxxxxx /dev/loop0 /dev/hda2</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> To prevent optimized dictionary attacks, it is recommended to add
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the -S xxxxxx option, where "xxxxxx" is your randomly chosen
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seed (for example, you might choose "gPk4lA"). Write down your seed on
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a piece of paper so that you don't loose it afterwards. Also, in order
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to avoid boot-time problems with the keyboard map, do not use non-ASCII
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characters (accents, etc.) in your password. The
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<A
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HREF="http://www.diceware.com/"
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TARGET="_top"
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>Diceware</A
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> site offers
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a simple way to create strong, yet easy to remember, passphrases.
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</P
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><P
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> Now create the ext3 filesystem:
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>mke2fs -j /dev/loop0</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> Check that the password you entered is correct:
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>losetup -d /dev/loop0
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losetup -e aes256 -S xxxxxx /dev/loop0 /dev/hda2</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>mkdir /mnt/efs
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mount /dev/loop0 /mnt/efs</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> You can compare the encrypted and unencrypted data:
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>xxd /dev/hda2 | less
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xxd /dev/loop0 | less</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> It's time to install your encrypted Linux system. If you use a GNU/Linux
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distribution (such as Debian, Slackware, Gentoo, Mandrake, RedHat/Fedora,
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SuSE, etc.), run the following command:
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</P
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>cp -avx / /mnt/efs</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> If you use the Linux From Scratch book, proceed as described in
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the manual, with the modifications below:
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<P
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></P
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><UL
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><LI
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><P
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>Chapter 6 - Installing util-linux:</P
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><P
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>Apply the loop-AES patch after unpacking the sources.</P
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></LI
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><LI
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><P
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>Chapter 8 - Making the LFS system bootable:</P
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><P
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>Refer to the next section (Setting up the boot device).</P
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></LI
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></UL
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>
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</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="preparing-system.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="setup-boot-device.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
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>Preparing the system</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Setting up the boot device</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |