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generating ssh user CA file

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This commit is contained in:
John Lancaster
2026-03-15 12:48:35 -05:00
parent 52390daf45
commit 497b6f1f78
3 changed files with 31 additions and 7 deletions
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1
keys/ssh_user_ca.pub Normal file
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@@ -0,0 +1 @@
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNpgz9xYE3K+JeQ7vtDA07iWlp0xTXB+G8MBzX6/RluXs8E6v+ahx90M093EYIOImaW6npWQ0JnFtmZaet5l9Ao=

2
modules/programs/step-client.nix
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@@ -40,7 +40,7 @@ in
imports = with inputs.self.modules.nixos; [ ssh ]; imports = with inputs.self.modules.nixos; [ ssh ];
# NixOS Config # NixOS Config
config = { config = {
ssh.certificates = true; ssh.certificates.enable = true;
home-manager.sharedModules = with inputs.self.modules; [ home-manager.sharedModules = with inputs.self.modules; [
homeManager.step-client homeManager.step-client
]; ];

35
modules/services/ssh.nix
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@@ -3,20 +3,43 @@ let
userName = "john"; userName = "john";
in in
{ {
flake.modules.nixos.ssh = { pkgs, config, lib, ... }: { flake.modules.nixos.ssh = { pkgs, config, lib, ... }:
options = { let
ssh.certificates = lib.mkEnableOption "Enable SSH certificates"; cfg = config.ssh;
in
{
options.ssh = {
certificates = {
enable = lib.mkEnableOption "Enable SSH certificates";
userCA = lib.mkOption {
type = lib.types.path;
default = ../../keys/ssh_user_ca.pub;
};
};
}; };
config = { config = {
services.openssh = { services.openssh = {
enable = true; enable = true;
# require public key authentication for better security # require public key authentication for better security
settings.PasswordAuthentication = false; settings = lib.mkMerge [
settings.KbdInteractiveAuthentication = false; {
PasswordAuthentication = false;
KbdInteractiveAuthentication = false;
}
(lib.mkIf cfg.certificates.enable {
TrustedUserCAKeys = "/etc/ssh/ssh_user_ca.pub";
HostKey = "/etc/ssh/ssh_host_ed25519_key";
HostCertificate = "/etc/ssh/ssh_host_ed25519_key-cert.pub";
})
];
}; };
programs.ssh.knownHosts = lib.mkIf config.ssh.certificates { environment.etc."ssh/ssh_user_ca.pub" = lib.mkIf cfg.certificates.enable {
source = cfg.certificates.userCA;
};
programs.ssh.knownHosts = lib.mkIf cfg.certificates.enable {
"192.168.1.*" = { "192.168.1.*" = {
certAuthority = true; certAuthority = true;
publicKey = "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNug18oLH0vZxnibXJzMJvTWFPZTnSlhCDDVi+rHhgnIum6ZXQ4SF+VHOOAM5BbzZmMKitNJ5lcrGP15Eur7DzQ="; publicKey = "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNug18oLH0vZxnibXJzMJvTWFPZTnSlhCDDVi+rHhgnIum6ZXQ4SF+VHOOAM5BbzZmMKitNJ5lcrGP15Eur7DzQ=";