diff options
| author | Francis Rowe <info@gluglug.org.uk> | 2014-11-05 20:52:36 (EST) |
|---|---|---|
| committer | Francis Rowe <info@gluglug.org.uk> | 2014-11-05 20:52:36 (EST) |
| commit | 8b2219bfa2da36e7809588ef723a10483a6e137f (patch) | |
| tree | 8c4d74b9efbdabc1a2604b8cbd508c006c225241 /docs/gnulinux/encrypted_trisquel.html | |
| parent | 7429bdcdbb4fc51c61897115112468642afeecfc (diff) | |
| download | libreboot-8b2219bfa2da36e7809588ef723a10483a6e137f.zip libreboot-8b2219bfa2da36e7809588ef723a10483a6e137f.tar.gz libreboot-8b2219bfa2da36e7809588ef723a10483a6e137f.tar.bz2 | |
Documentation: *major* cleanup.
Cleanup was long overdue. Old structure was messy and inefficient.
Diffstat (limited to 'docs/gnulinux/encrypted_trisquel.html')
| -rw-r--r-- | docs/gnulinux/encrypted_trisquel.html | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/docs/gnulinux/encrypted_trisquel.html b/docs/gnulinux/encrypted_trisquel.html new file mode 100644 index 0000000..5becddc --- /dev/null +++ b/docs/gnulinux/encrypted_trisquel.html @@ -0,0 +1,308 @@ +<!DOCTYPE html> +<html> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + + <style type="text/css"> + @import url('../css/main.css'); + </style> + + <title>Installing Trisquel GNU/Linux with full disk encryption (including /boot)</title> +</head> + +<body> + <header> + <h1>Installing Trisquel GNU/Linux with full disk encryption (including /boot)</h1> + <aside>Or <a href="index.html">back to main index</a></aside> + </header> + + <p> + Libreboot uses the GRUB <a href="http://www.coreboot.org/Payloads#GRUB_2">payload</a> + by default, which means that the GRUB configuration file + (where your GRUB menu comes from) is stored directly alongside libreboot + and it's GRUB payload executable, inside + the flash chip. In context, this means that installing distributions and managing them + is handled slightly differently compared to traditional BIOS systems. + </p> + + <p> + On most systems, the /boot partition has to be left unencrypted while the others are encrypted. + This is so that GRUB, and therefore the kernel, can be loaded and executed since the firmware + can't open a LUKS volume. Not so with libreboot! Since GRUB is already included directly as a + payload, even /boot can be encrypted. This protects /boot from tampering by someone with physical + access to the machine. + </p> + + <p> + This works in Trisquel 7, and probably Trisquel 6. Boot the 'net installer' (Install Trisquel in Text Mode). <a href="grub_boot_installer.html">How to boot a GNU/Linux installer</a>. + </p> + + <p> + Set a strong user password (ideally above 40 characters, of lowercase/uppercase, numbers and symbols). + </p> + + <p> + when the installer asks you to setup + encryption (ecryptfs) for your home directory, select 'Yes' if you want to: <b>LUKS is already secure and performs well. Having ecryptfs on top of it + will add noticeable performance penalty, for little security gain in most use cases. This is therefore optional, and not recommended. + Choose 'no'.</b> + </p> + + <p> + <b> + Your user password should be different than the LUKS password which you will set later on. + Your LUKS password should, like the user password, be secure. + </b> + </p> + + <h1>Partitioning</h1> + + <p>Choose 'Manual' partitioning:</p> + <ul> + <li>Select drive and create new partition table</li> + <li> + Single large partition. The following are mostly defaults: + <ul> + <li>Use as: physical volume for encryption</li> + <li>Encryption: aes</li> + <li>key size: 256</li> + <li>IV algorithm: xts-plain64</li> + <li>Encryption key: passphrase</li> + <li>erase data: Yes (only choose 'No' if it's a new drive that doesn't contain your private data)</li> + </ul> + </li> + <li> + Select 'configure encrypted volumes' + <ul> + <li>Create encrypted volumes</li> + <li>Select your partition</li> + <li>Finish</li> + <li>Really erase: Yes</li> + <li>(erase will take a long time. be patient)</li> + <li>(if your old system was encrypted, just let this run for about a minute to + make sure that the LUKS header is wiped out)</li> + </ul> + </li> + <li> + Select encrypted space: + <ul> + <li>use as: physical volume for LVM</li> + <li>Choose 'done setting up the partition'</li> + </ul> + </li> + <li> + Configure the logical volume manager: + <ul> + <li>Keep settings: Yes</li> + </ul> + </li> + <li> + Create volume group: + <ul> + <li>Name: <b>buzz</b> (you can use whatever you want here, this is just an example)</li> + <li>Select crypto partition</li> + </ul> + </li> + <li> + Create logical volume + <ul> + <li>select <b>buzz</b> (or whatever you named it before)</li> + <li>name: <b>distro</b> (you can use whatever you want here, this is just an example)</li> + <li>size: default, minus 2048 MB</li> + </ul> + </li> + <li> + Create logical volume + <ul> + <li>select <b>buzz</b> (or whatever you named it before)</li> + <li>name: <b>swap</b> (you can use whatever you want here, this is just an example)</li> + <li>size: press enter</li> + </ul> + </li> + </ul> + + <h1>Further partitioning</h1> + + <p> + Now you are back at the main partitioning screen. You will simply set mountpoints and filesystems to use. + </p> + <ul> + <li> + LVM LV distro + <ul> + <li>use as: ext4</li> + <li>mount point: /</li> + <li>done setting up partition</li> + </ul> + </li> + <li> + LVM LV swap + <ul> + <li>use as: swap area</li> + <li>done setting up partition</li> + </ul> + </li> + <li>Now you select 'Finished partitioning and write changes to disk'.</li> + </ul> + + <h1>Kernel</h1> + + <p> + Installation will ask what kernel you want to use. linux-generic is fine. + </p> + + <h1>Tasksel</h1> + + <p> + Choose <i>"Trisquel Desktop Environment"</i> if you want GNOME, + <i>"Trisquel-mini Desktop Environment"</i> if you + want LXDE or <i>"Triskel Desktop Environment"</i> if you want KDE. + If you want to have no desktop (just a basic shell) + when you boot or if you want to create your own custom setup, then choose nothing here (don't select anything). + You might also want to choose some of the other package groups; it's up to you. + </p> + + <h1>Postfix configuration</h1> + + <p> + If asked, choose <i>"No Configuration"</i> here (or maybe you want to select something else. It's up to you.) + </p> + + <h1>Install the GRUB boot loader to the master boot record</h1> + + <p> + Choose 'Yes'. It will fail, but don't worry. Then at the main menu, choose 'Continue without a bootloader'. + You could also choose 'No'. Choice is irrelevant here. + </p> + + <p> + <i>You do not need to install GRUB at all, since in libreboot you are using the GRUB payload (for libreboot) to boot your system directly.</i> + </p> + + <h1>Clock UTC</h1> + + <p> + Just say 'Yes'. + </p> + + <h1> + Booting your system + </h1> + + <p> + At this point, you will have finished the installation. At your GRUB payload, press C to get to the command line. + </p> + + <p> + Do that:<br/> + grub> <b>cryptomount -a (ahci0,msdos1)</b><br/> + grub> <b>set root='lvm/buzz-distro'</b><br/> + grub> <b>linux /vmlinuz root=/dev/mapper/buzz-distro cryptdevice=/dev/mapper/buzz-distro:root</b><br/> + grub> <b>initrd /initrd.img</b><br/> + grub> <b>boot</b> + </p> + + <h1> + ecryptfs + </h1> + + <p> + If you didn't encrypted your home directory, then you can safely ignore this section. + </p> + + <p> + Immediately after logging in, do that:<br/> + $ <b>sudo ecryptfs-unwrap-passphrase</b> + </p> + + <p> + This will be needed in the future if you ever need to recover your home directory from another system, so write it down and keep the note + somewhere secret. Ideally, you should memorize it and then burn the note (or not even write it down, and memorize it still)> + </p> + + <h1> + Modify grub.cfg (CBFS) + </h1> + + <p> + Now you need to set it up so that the system will automatically boot, without having to type a bunch of commands. + </p> + + <p> + Modify your grub.cfg (in the firmware) <a href="grub_cbfs.html">using this tutorial</a>; + just change the default menu entry 'Load Operating System' to say this inside: + </p> + + <p> + <b>cryptomount -a (ahci0,msdos1)</b><br/> + <b>set root='lvm/buzz-distro'</b><br/> + <b>linux /vmlinuz root=/dev/mapper/buzz-distro cryptdevice=/dev/mapper/buzz-distro:root</b><br/> + <b>initrd /initrd.img</b> + </p> + + <p> + Additionally, you should set a GRUB password. This is not your LUKS password, but it's a password that you have to enter to see + GRUB. This protects your system from an attacker simply booting a live USB and re-flashing your firmware. <b>This should be different than your LUKS passphrase and user password.</b> + </p> + + <p> + The GRUB utility can be used like so:<br/> + $ <b>grub-mkpasswd-pbkdf2</b> + </p> + + <p> + Give it a password (remember, it has to be secure) and it'll output something like:<br/> + <b>grub.pbkdf2.sha512.10000.711F186347156BC105CD83A2ED7AF1EB971AA2B1EB2640172F34B0DEFFC97E654AF48E5F0C3B7622502B76458DA494270CC0EA6504411D676E6752FD1651E749.8DD11178EB8D1F633308FD8FCC64D0B243F949B9B99CCEADE2ECA11657A757D22025986B0FA116F1D5191E0A22677674C994EDBFADE62240E9D161688266A711</b> + </p> + + <p> + Put that in the grub.cfg (the one for CBFS inside the ROM) before the 'Load Operating System' menu entry like so (example):<br/> + </p> + <pre> +<b>set superusers="root"</b> +<b>password_pbkdf2 root grub.pbkdf2.sha512.10000.711F186347156BC105CD83A2ED7AF1EB971AA2B1EB2640172F34B0DEFFC97E654AF48E5F0C3B7622502B76458DA494270CC0EA6504411D676E6752FD1651E749.8DD11178EB8D1F633308FD8FCC64D0B243F949B9B99CCEADE2ECA11657A757D22025986B0FA116F1D5191E0A22677674C994EDBFADE62240E9D161688266A711</b> + </pre> + + <p> + Obviously, replace it with the correct hash that you actually got for the password that you entered. Meaning, not the hash that you see above! + </p> + + <p> + After this, you will have a modified ROM with the menu entry for cryptomount, and the entry before that for the GRUB password. Flash the modified ROM + using <a href="../install/index.html#flashrom">this tutorial</a>. + </p> + + <h1> + Update Trisquel + </h1> + + <p> + $ <b>sudo apt-get update</b><br/> + $ <b>sudo apt-get upgrade</b> + </p> + + <h1> + Conclusion + </h1> + + <p> + If you followed all that correctly, you should now have a fully encrypted system. + </p> + +<hr/> + + <p> + Copyright © 2014 Francis Rowe <info@gluglug.org.uk><br/> + This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions. + A copy of the license can be found at <a href="../license.txt">../license.txt</a>. + </p> + + <p> + This document is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See <a href="../license.txt">../license.txt</a> for more information. + </p> + +</body> +</html> |