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{ config, lib, customUtils, pkgs, ... }:
with lib;
let
inherit (customUtils) mapFilterAttrs;
tsigSecretName = domain: "${domain}_tsig-secret";
cfg = config.security.acme;
knotCfg = config.services.knot;
knotDNSCredentials = domain: let
zone = if cfg.domains.${domain}.zone == null then domain else cfg.domains.${domain}.zone;
in pkgs.writeText "lego-credentials" ''
EXEC_PATH=${knotDNSExec zone}/bin/update-dns.sh
EXEC_PROPAGATION_TIMEOUT=300
EXEC_POLLING_INTERVAL=5
'';
knotDNSExec = zone: pkgs.writeScriptBin "update-dns.sh" ''
#!${pkgs.zsh}/bin/zsh -xe
mode=$1
fqdn=$2
challenge=$3
owner=''${fqdn%".${zone}."}
commited=
function abort() {
[[ -n "''${commited}" ]] || ${knotCfg.cliWrappers}/bin/knotc zone-abort "${zone}"
}
${knotCfg.cliWrappers}/bin/knotc zone-begin "${zone}"
trap abort EXIT
case "''${mode}" in
present)
if ${knotCfg.cliWrappers}/bin/knotc zone-get ${zone} "''${owner}" TXT; then
${knotCfg.cliWrappers}/bin/knotc zone-unset ${zone} "''${owner}" TXT '""'
fi
${knotCfg.cliWrappers}/bin/knotc zone-set ${zone} "''${owner}" 30 TXT "''${challenge}"
;;
cleanup)
${knotCfg.cliWrappers}/bin/knotc zone-unset ${zone} "''${owner}" TXT "''${challenge}"
${knotCfg.cliWrappers}/bin/knotc zone-set ${zone} "''${owner}" 30 TXT '""'
;;
*)
exit 2
;;
esac
${knotCfg.cliWrappers}/bin/knotc zone-commit "${zone}"
commited=yes
'';
domainOptions = {
options = {
wildcard = mkOption {
type = types.bool;
default = false;
};
zone = mkOption {
type = types.nullOr types.str;
default = null;
};
certCfg = mkOption {
type = types.attrs;
default = {};
};
};
};
in {
options = {
security.acme = {
domains = mkOption {
type = types.attrsOf (types.submodule domainOptions);
default = {};
};
};
};
config = {
security.acme.domains = genAttrs ["dirty-haskell.org" "141.li" "xmpp.li" "yggdrasil.li" "praseodym.org" "rheperire.org" "kleen.li" "nights.email"] (domain: { wildcard = true; });
fileSystems."/var/lib/acme" =
{ device = "surtr/safe/var-lib-acme";
fsType = "zfs";
};
security.acme = {
acceptTerms = true;
preliminarySelfsigned = true; # DNS challenge is slow
defaults = {
email = "phikeebaogobaegh@141.li";
keyType = "rsa4096"; # we don't like NIST curves
extraLegoRenewFlags = [
# "--preferred-chain" "ISRG Root X1"
"--always-deactivate-authorizations" "true"
];
extraLegoRunFlags = config.security.acme.defaults.extraLegoRenewFlags;
};
certs =
let
domainAttrset = domain: let
tsigPath = ./tsig_keys + "/${domain}";
tsigSecret = config.sops.secrets.${tsigSecretName domain};
isTsig = pathExists tsigPath;
shared = {
inherit domain;
extraDomainNames = optional cfg.domains.${domain}.wildcard "*.${domain}";
dnsResolver = "127.0.0.1:5353";
};
mkKnotc = shared // {
dnsProvider = "exec";
credentialsFile = knotDNSCredentials domain;
};
mkRFC2136 = let
tsigInfo = readYaml tsigPath;
in shared // {
dnsProvider = "rfc2136";
credentialsFile = pkgs.writeText "${domain}_credentials.env" ''
RFC2136_NAMESERVER=127.0.0.1:53
RFC2136_TSIG_ALGORITHM=hmac-sha256.
RFC2136_TSIG_KEY=${domain}_acme_key
RFC2136_TSIG_SECRET_FILE=${tsigSecret.path}
RFC2136_TTL=0
RFC2136_PROPAGATION_TIMEOUT=60
RFC2136_POLLING_INTERVAL=2
'';
};
in (if isTsig then mkRFC2136 else mkKnotc) // cfg.domains.${domain}.certCfg;
in genAttrs (attrNames cfg.domains) domainAttrset;
};
sops.secrets = let
toTSIGSecret = n: v:
if v == "regular" || v == "symlink"
then nameValuePair (tsigSecretName n) {
format = "binary";
owner = if config.security.acme.useRoot then "root" else "acme";
group = "acme";
sopsFile = ./tsig_keys + "/${n}";
} else null;
in mapFilterAttrs (_: v: v != null) toTSIGSecret (builtins.readDir ./tsig_keys);
systemd.services =
let
serviceAttrset = domain: {
after = [ "knot.service" ];
bindsTo = [ "knot.service" ];
serviceConfig = {
ReadWritePaths = ["/run/knot/knot.sock"];
SupplementaryGroups = ["knot"];
RestrictAddressFamilies = ["AF_UNIX"];
};
};
in mapAttrs' (domain: nameValuePair "acme-${domain}") (genAttrs (attrNames config.security.acme.certs) serviceAttrset);
};
}
|
