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modules/nixos/common: add initrd ssh #1383

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modules/nixos/common: add initrd ssh #1383

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22 changes: 22 additions & 0 deletions modules/nixos/common/security.nix
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Original file line number Diff line number Diff line change
@@ -1,10 +1,32 @@
{
config,
inputs,
lib,
...
}:
let
initrd_host_key = "/etc/ssh/initrd_host_ed25519_key";
in
{
# Make sure that the firewall is enabled, even if it's the default.
networking.firewall.enable = true;

# allow to access emergency shell with a password
boot.initrd.systemd.emergencyAccess = "$6$he2fblfl/H7I.kvz$WbSCMXu8ztmqfj5jG4czqvu/rkMHxufxqHgy1urzXFSN.jZB4QiW5lOjR08vk8pZTyim3TT1wFkMaNE9zZ3sc1";

boot.initrd.network = {
enable = true;
ssh = {
enable = true;
authorizedKeyFiles = lib.filesystem.listFilesRecursive "${inputs.self}/users/keys";
hostKeys = [ initrd_host_key ];
};
};

system.activationScripts.initrd-ssh-host-key = ''
[[ -f ${initrd_host_key} ]] || ${config.programs.ssh.package}/bin/ssh-keygen -q -t ed25519 -N "" -f ${initrd_host_key}
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That will fail on the first deployment, but than work on the second one. So probably fine?

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That will fail on the first deployment

Could you explain please?

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@Mic92 Mic92 Dec 18, 2024 •
edited
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activation phase is run after the boot loader is installed in nixos-rebuild. So on the first deployment this will fail.

'';

services.openssh = {
hostKeys = [
{
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