Remote disk unlocking: Difference between revisions
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This page describes the method for <strong>remotely</strong> unlocking LUKS / ZFS encrypted root partition during boot process. SSH or even Tor may be used to access the system. | |||
== Setup == | == Setup == | ||
Generate host key for the SSH daemon which will run in initrd during boot | Generate host key for the SSH daemon which will run in initrd during boot (required) | ||
<syntaxhighlight lang=" | <syntaxhighlight lang="console"> | ||
# mkdir -p /etc/secrets/initrd | # mkdir -p /etc/secrets/initrd | ||
# ssh-keygen -t ed25519 -N "" -f /etc/secrets/initrd/ssh_host_ed25519_key | # ssh-keygen -t ed25519 -N "" -f /etc/secrets/initrd/ssh_host_ed25519_key | ||
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enable = true; | enable = true; | ||
port = 22; | port = 22; | ||
authorizedKeys = [ "ssh-rsa AAAAyourpublic-key-here..." ]; | authorizedKeys = [ "ssh-rsa AAAAyourpublic-key-here..." ]; # The public key of the client (Not the public key created in the previous step) (required) | ||
hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ]; | hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ]; # The path of the private key created in the previous step (required) | ||
}; | }; | ||
postCommands = '' | postCommands = '' | ||
# | # unlock LUKS encrypted partitions | ||
echo 'cryptsetup-askpass | echo 'cryptsetup-askpass'</nowiki> >> <nowiki>/root/.profile | ||
# unlock ZFS encrypted partitions (NOTE: boot.initrd.supportedFilesystems.zfs must be true for zfs, zpool to be available here) | |||
# zpool import -a; | |||
# echo 'zfs load-key -a'</nowiki> >> <nowiki>/root/.profile | |||
# exit SSH | |||
echo 'exit'</nowiki> >> <nowiki>/root/.profile | |||
''; | ''; | ||
}; | }; | ||
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* '''authorizedKeys''': Add the SSH public keys for the users which should be able to authenticate to the SSH daemon to the <code>authorizedKeys</code> option. | * '''authorizedKeys''': Add the SSH public keys for the users which should be able to authenticate to the SSH daemon to the <code>authorizedKeys</code> option. | ||
* '''availableKernelModules''': Most likely your network card is not working without its kernel module being part of the initrd, so you have to find out which module is used for your network. Use <code>lspci -v | grep -iA8 'network\|ethernet'</code> for that. | * '''availableKernelModules''': Most likely your network card is not working without its kernel module being part of the initrd, so you have to find out which module is used for your network. Use <code>lspci -v | grep -iA8 'network\|ethernet'</code> for that. | ||
* '''kernelParams''': | * '''kernelParams''': | ||
** When using a dynamic IP address with DHCP you might want to publish your hostname already in the initrd so it can be resolved in the local network: <code>boot.kernelParams = [ "ip=::::${config.networking.hostName}::dhcp" ];</code><ref>https://github.com/NixOS/nixpkgs/issues/63941#issuecomment-2628615604</ref> Note that when using DHCP, make sure your computer is always attached to the network and is able to get an IP adress, or the boot process will hang. | |||
** You could also configure a static IP <code>boot.kernelParams = [ "ip=10.25.0.2::10.25.0.1:255.255.255.0:myhost::none" ];</code>, where <code>10.25.0.2</code> is the client IP, <code>10.25.0.1</code> is the gateway IP. See [https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt the kernel documentation] for more information on the <code>ip=</code> parameter. | |||
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* <code>hs_ed25519_secret_key</code> | * <code>hs_ed25519_secret_key</code> | ||
To create these files | To create these files: | ||
$ nix-shell -p mkp224o --command "mkp224o-donna snow -n 1 -d ." | |||
set workdir: ./ | |||
nixuum6flqthv6ar52j5e2ldulylfsfgezykeg37iy74kqowcp5gxfyd.onion | |||
The files you need are in the <code>*.onion</code> directory: | |||
$ ls *.onion | |||
hostname hs_ed25519_public_key hs_ed25519_secret_key | |||
==== Setup Tor ==== | ==== Setup Tor ==== | ||
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<syntaxhighlight lang="nix"># copy your onion folder | <syntaxhighlight lang="nix"># copy your onion folder | ||
boot.initrd.secrets = { | boot.initrd.secrets = { | ||
"/etc/tor/onion/bootup" | "/etc/tor/onion/bootup" = /home/tony/tor/onion; # maybe find a better spot to store this. | ||
}; | }; | ||