{
  lib,
  config,
  pkgs,
  pkgs-hashicorp,
  secret,
  inputs',
  ...
}: let
  inherit
    (lib)
    mkForce
    ;
  certs = config.services.acme-sh.certs;
in {
  services.hashicorp.vault = {
    enable = true;

    package = pkgs-hashicorp.vault-bin;

    settings = {
      backend."file".path = "/var/lib/vault";

      ui = true;

      listener = [
        {
          "tcp" = {
            address = "localhost:8200";
            tls_cert_file = "${certs.vault.certPath}";
            tls_key_file = "${certs.vault.keyPath}";
          };
        }
        {
          "tcp" = {
            address = "${secret.network.ips.blowhole.ip or ""}:8200";
            tls_cert_file = "${certs.vault.certPath}";
            tls_key_file = "${certs.vault.keyPath}";
          };
        }
      ];

      storage."raft" = {
        path = "/var/lib/vault";
        node_id = "blowhole";
      };
      cluster_addr = "https://${secret.network.ips.blowhole.ip or ""}:8201";
      api_addr = "http://${secret.network.ips.blowhole.ip or ""}:8200";
    };
  };

  services.acme-sh.certs.vault = {
    production = true;
    user = "root";
    domains."vault.in.redalder.org" = "dns_hetzner";
    mainDomain = "vault.in.redalder.org";
    postRun = "systemctl try-reload-or-restart --no-block hashicorp-vault.service";
  };

  systemd.services."acme-sh-vault" = {
    serviceConfig.EnvironmentFile = mkForce "/var/secrets/hetzner.env";
  };

  services.acme-sh.certs.vault-wildcard = {
    production = true;
    user = "root";
    domains."*.in.redalder.org" = "dns_hetzner";
    mainDomain = "*.in.redalder.org";
    # Trigger vault to reread certificate files.
    postRun = ''
      PEM_BUNDLE=$(cat <<EOF
      $(cat '${certs.vault-wildcard.statePath}/*.in.redalder.org/ca.cer')
      $(cat '${certs.vault-wildcard.keyPath}')
      EOF
      )
      (
        exec 44<<<"$PEM_BUNDLE"
        VAULT_ADDR="https://vault.in.redalder.org:8200" \
        VAULT_TOKEN="$(cat /run/secrets/vault-token)" \
        ${pkgs.vault}/bin/vault write pki-inra/config/ca pem_bundle=@/proc/self/fd/44
      )
    '';
  };

  systemd.services."acme-sh-vault-wildcard" = {
    serviceConfig.EnvironmentFile = mkForce "/var/secrets/hetzner.env";
  };
}