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ssh-ca-vault: init

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Luke Granger-Brown 2022-03-11 21:48:06 +00:00
parent 86a6191a56
commit ac0c6eccef
5 changed files with 48 additions and 1 deletions
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1
ops/nixos/lib/common.nix
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@ -20,6 +20,7 @@ in
./vault-agent.nix
./vault-agent-acme.nix
./vault-agent-secrets.nix
./ssh-ca-vault.nix
];
options.my.specialisationName = lib.mkOption {

41
ops/nixos/lib/ssh-ca-vault.nix Normal file
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@ -0,0 +1,41 @@
# SPDX-FileCopyrightText: 2020 Luke Granger-Brown <depot@lukegb.com>
#
# SPDX-License-Identifier: Apache-2.0
{ config, lib, ... }:
let
inherit (lib) listToAttrs nameValuePair mkAfter concatMapStrings;
keyTypes = [ "ed25519" "rsa" ];
hostKeyForKeyType = keyType: "/etc/ssh/ssh_host_${keyType}_key.pub";
secretNameForKeyType = keyType: "openssh-cert-${keyType}";
signedPaths = map (keyType: config.my.vault.secrets.${secretNameForKeyType keyType}.path) keyTypes;
in {
config = {
my.vault.secrets = let
hostname = config.networking.hostName;
fromKey = keyType: {
template = ''
{{ with file "${hostKeyForKeyType keyType}" | printf "public_key=%s" | secret "ssh-host/sign/${hostname}" "cert_type=host" "valid_principals=${hostname}.as205479.net,${hostname}.int.as205479.net" }}
{{ .Data.signed_key }}
{{ end }}
'';
group = "root";
reloadOrRestartUnits = [ "sshd.service" ];
};
in listToAttrs (map (keyType: nameValuePair (secretNameForKeyType keyType) (fromKey keyType)) keyTypes);
systemd.services.vault-agent.serviceConfig.ReadOnlyPaths = mkAfter (map hostKeyForKeyType keyTypes);
services.openssh.extraConfig = concatMapStrings (c: "HostCertificate ${c}\n") signedPaths + ''
TrustedUserCAKeys ${../../secrets/client-ca.pub}
AuthorizedPrincipalsFile %h/.ssh/authorized_principals
AuthorizedPrincipalsFile /etc/ssh/authorized_principals.d/%u
'';
environment.etc."ssh/authorized_principals.d/root".text = ''
lukegb
'';
};
}

5
ops/nixos/lib/vault-agent.nix
View file

@ -39,7 +39,10 @@ in
my.vault.enable = mkDefault true;
my.vault.settings = {
pid_file = mkDefault "/run/vault-agent/pid";
vault.address = mkDefault "https://vault.int.lukegb.com";
vault = {
address = mkDefault "https://vault.int.lukegb.com";
retry.num_retries = mkDefault 1;
};
auto_auth.method = mkDefault [{
type = "approle";
config = {

1
ops/secrets/client-ca.pub Normal file
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@ -0,0 +1 @@
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEqNOwlR7Qa8cbGpDfSCOweDPbAGQOZIcoRgh6s/J8DR vault-clients

1
ops/secrets/server-ca.pub Normal file
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@ -0,0 +1 @@
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINpQayDIvvBUCc1roNzDwT04tG7JuXQg1QlvvNyb/CHT vault-server