673 lines
24 KiB
Nix
673 lines
24 KiB
Nix
{ config, lib, pkgs, options, ... }:
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with lib;
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let
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cfg = config.security.acme;
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# Used to calculate timer accuracy for coalescing
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numCerts = length (builtins.attrNames cfg.certs);
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_24hSecs = 60 * 60 * 24;
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# There are many services required to make cert renewals work.
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# They all follow a common structure:
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# - They inherit this commonServiceConfig
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# - They all run as the acme user
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# - They all use BindPath and StateDirectory where possible
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# to set up a sort of build environment in /tmp
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# The Group can vary depending on what the user has specified in
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# security.acme.certs.<cert>.group on some of the services.
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commonServiceConfig = {
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Type = "oneshot";
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User = "acme";
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Group = mkDefault "acme";
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UMask = 0027;
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StateDirectoryMode = 750;
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ProtectSystem = "full";
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PrivateTmp = true;
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WorkingDirectory = "/tmp";
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};
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# In order to avoid race conditions creating the CA for selfsigned certs,
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# we have a separate service which will create the necessary files.
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selfsignCAService = {
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description = "Generate self-signed certificate authority";
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path = with pkgs; [ minica ];
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unitConfig = {
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ConditionPathExists = "!/var/lib/acme/.minica/key.pem";
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};
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serviceConfig = commonServiceConfig // {
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StateDirectory = "acme/.minica";
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BindPaths = "/var/lib/acme/.minica:/tmp/ca";
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};
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# Working directory will be /tmp
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script = ''
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minica \
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--ca-key ca/key.pem \
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--ca-cert ca/cert.pem \
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--domains selfsigned.local
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chmod 600 ca/*
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'';
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};
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# Previously, all certs were owned by whatever user was configured in
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# config.security.acme.certs.<cert>.user. Now everything is owned by and
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# run by the acme user.
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userMigrationService = {
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description = "Fix owner and group of all ACME certificates";
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script = with builtins; concatStringsSep "\n" (mapAttrsToList (cert: data: ''
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for fixpath in /var/lib/acme/${escapeShellArg cert} /var/lib/acme/.lego/${escapeShellArg cert}; do
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if [ -d "$fixpath" ]; then
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chmod -R 750 "$fixpath"
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chown -R acme:${data.group} "$fixpath"
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fi
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done
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'') certConfigs);
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# We don't want this to run every time a renewal happens
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serviceConfig.RemainAfterExit = true;
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};
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certToConfig = cert: data: let
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acmeServer = if data.server != null then data.server else cfg.server;
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useDns = data.dnsProvider != null;
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destPath = "/var/lib/acme/${cert}";
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selfsignedDeps = optionals (cfg.preliminarySelfsigned) [ "acme-selfsigned-${cert}.service" ];
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# Minica and lego have a "feature" which replaces * with _. We need
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# to make this substitution to reference the output files from both programs.
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# End users never see this since we rename the certs.
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keyName = builtins.replaceStrings ["*"] ["_"] data.domain;
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# FIXME when mkChangedOptionModule supports submodules, change to that.
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# This is a workaround
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extraDomains = data.extraDomainNames ++ (
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optionals
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(data.extraDomains != "_mkMergedOptionModule")
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(builtins.attrNames data.extraDomains)
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);
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# Create hashes for cert data directories based on configuration
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# Flags are separated to avoid collisions
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hashData = with builtins; ''
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${concatStringsSep " " data.extraLegoFlags} -
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${concatStringsSep " " data.extraLegoRunFlags} -
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${concatStringsSep " " data.extraLegoRenewFlags} -
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${toString acmeServer} ${toString data.dnsProvider}
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${toString data.ocspMustStaple} ${data.keyType}
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'';
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mkHash = with builtins; val: substring 0 20 (hashString "sha256" val);
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certDir = mkHash hashData;
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domainHash = mkHash "${concatStringsSep " " extraDomains} ${data.domain}";
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othersHash = mkHash "${toString acmeServer} ${data.keyType}";
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accountDir = "/var/lib/acme/.lego/accounts/" + othersHash;
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protocolOpts = if useDns then (
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[ "--dns" data.dnsProvider ]
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++ optionals (!data.dnsPropagationCheck) [ "--dns.disable-cp" ]
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) else (
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[ "--http" "--http.webroot" data.webroot ]
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);
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commonOpts = [
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"--accept-tos" # Checking the option is covered by the assertions
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"--path" "."
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"-d" data.domain
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"--email" data.email
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"--key-type" data.keyType
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] ++ protocolOpts
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++ optionals data.ocspMustStaple [ "--must-staple" ]
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++ optionals (acmeServer != null) [ "--server" acmeServer ]
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++ concatMap (name: [ "-d" name ]) extraDomains
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++ data.extraLegoFlags;
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runOpts = escapeShellArgs (
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commonOpts
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++ [ "run" ]
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++ data.extraLegoRunFlags
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);
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renewOpts = escapeShellArgs (
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commonOpts
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++ [ "renew" "--reuse-key" ]
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++ data.extraLegoRenewFlags
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);
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in {
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inherit accountDir selfsignedDeps;
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webroot = data.webroot;
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group = data.group;
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renewTimer = {
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description = "Renew ACME Certificate for ${cert}";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = cfg.renewInterval;
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Unit = "acme-${cert}.service";
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Persistent = "yes";
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# Allow systemd to pick a convenient time within the day
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# to run the check.
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# This allows the coalescing of multiple timer jobs.
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# We divide by the number of certificates so that if you
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# have many certificates, the renewals are distributed over
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# the course of the day to avoid rate limits.
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AccuracySec = "${toString (_24hSecs / numCerts)}s";
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# Skew randomly within the day, per https://letsencrypt.org/docs/integration-guide/.
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RandomizedDelaySec = "24h";
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};
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};
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selfsignService = {
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description = "Generate self-signed certificate for ${cert}";
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after = [ "acme-selfsigned-ca.service" "acme-fixperms.service" ];
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requires = [ "acme-selfsigned-ca.service" "acme-fixperms.service" ];
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path = with pkgs; [ minica ];
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unitConfig = {
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ConditionPathExists = "!/var/lib/acme/${cert}/key.pem";
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};
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serviceConfig = commonServiceConfig // {
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Group = data.group;
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StateDirectory = "acme/${cert}";
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BindPaths = "/var/lib/acme/.minica:/tmp/ca /var/lib/acme/${cert}:/tmp/${keyName}";
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};
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# Working directory will be /tmp
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# minica will output to a folder sharing the name of the first domain
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# in the list, which will be ${data.domain}
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script = ''
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minica \
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--ca-key ca/key.pem \
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--ca-cert ca/cert.pem \
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--domains ${escapeShellArg (builtins.concatStringsSep "," ([ data.domain ] ++ extraDomains))}
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# Create files to match directory layout for real certificates
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cd '${keyName}'
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cp ../ca/cert.pem chain.pem
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cat cert.pem chain.pem > fullchain.pem
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cat key.pem fullchain.pem > full.pem
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chmod 640 *
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# Group might change between runs, re-apply it
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chown 'acme:${data.group}' *
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'';
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};
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renewService = {
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description = "Renew ACME certificate for ${cert}";
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after = [ "network.target" "network-online.target" "acme-fixperms.service" "nss-lookup.target" ] ++ selfsignedDeps;
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wants = [ "network-online.target" "acme-fixperms.service" ] ++ selfsignedDeps;
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# https://github.com/NixOS/nixpkgs/pull/81371#issuecomment-605526099
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wantedBy = optionals (!config.boot.isContainer) [ "multi-user.target" ];
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path = with pkgs; [ lego coreutils diffutils ];
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serviceConfig = commonServiceConfig // {
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Group = data.group;
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# AccountDir dir will be created by tmpfiles to ensure correct permissions
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# And to avoid deletion during systemctl clean
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# acme/.lego/${cert} is listed so that it is deleted during systemctl clean
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StateDirectory = "acme/${cert} acme/.lego/${cert} acme/.lego/${cert}/${certDir}";
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# Needs to be space separated, but can't use a multiline string because that'll include newlines
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BindPaths =
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"${accountDir}:/tmp/accounts " +
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"/var/lib/acme/${cert}:/tmp/out " +
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"/var/lib/acme/.lego/${cert}/${certDir}:/tmp/certificates ";
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# Only try loading the credentialsFile if the dns challenge is enabled
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EnvironmentFile = mkIf useDns data.credentialsFile;
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# Run as root (Prefixed with +)
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ExecStartPost = "+" + (pkgs.writeShellScript "acme-postrun" ''
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cd /var/lib/acme/${escapeShellArg cert}
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if [ -e renewed ]; then
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rm renewed
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${data.postRun}
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fi
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'');
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};
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# Working directory will be /tmp
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script = ''
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set -euo pipefail
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echo '${domainHash}' > domainhash.txt
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# Check if we can renew
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if [ -e 'certificates/${keyName}.key' -a -e 'certificates/${keyName}.crt' ]; then
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# When domains are updated, there's no need to do a full
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# Lego run, but it's likely renew won't work if days is too low.
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if [ -e certificates/domainhash.txt ] && cmp -s domainhash.txt certificates/domainhash.txt; then
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lego ${renewOpts} --days ${toString cfg.validMinDays}
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else
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# Any number > 90 works, but this one is over 9000 ;-)
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lego ${renewOpts} --days 9001
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fi
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# Otherwise do a full run
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else
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lego ${runOpts}
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fi
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mv domainhash.txt certificates/
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chmod 640 certificates/*
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chmod -R 700 accounts/*
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# Group might change between runs, re-apply it
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chown 'acme:${data.group}' certificates/*
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# Copy all certs to the "real" certs directory
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CERT='certificates/${keyName}.crt'
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if [ -e "$CERT" ] && ! cmp -s "$CERT" out/fullchain.pem; then
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touch out/renewed
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echo Installing new certificate
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cp -vp 'certificates/${keyName}.crt' out/fullchain.pem
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cp -vp 'certificates/${keyName}.key' out/key.pem
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cp -vp 'certificates/${keyName}.issuer.crt' out/chain.pem
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ln -sf fullchain.pem out/cert.pem
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cat out/key.pem out/fullchain.pem > out/full.pem
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fi
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'';
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};
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};
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certConfigs = mapAttrs certToConfig cfg.certs;
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certOpts = { name, ... }: {
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options = {
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# user option has been removed
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user = mkOption {
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visible = false;
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default = "_mkRemovedOptionModule";
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};
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# allowKeysForGroup option has been removed
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allowKeysForGroup = mkOption {
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visible = false;
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default = "_mkRemovedOptionModule";
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};
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# extraDomains was replaced with extraDomainNames
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extraDomains = mkOption {
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visible = false;
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default = "_mkMergedOptionModule";
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};
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webroot = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "/var/lib/acme/acme-challenges";
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description = ''
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Where the webroot of the HTTP vhost is located.
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<filename>.well-known/acme-challenge/</filename> directory
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will be created below the webroot if it doesn't exist.
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<literal>http://example.org/.well-known/acme-challenge/</literal> must also
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be available (notice unencrypted HTTP).
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'';
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};
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server = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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ACME Directory Resource URI. Defaults to Let's Encrypt's
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production endpoint,
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<link xlink:href="https://acme-v02.api.letsencrypt.org/directory"/>, if unset.
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'';
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};
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domain = mkOption {
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type = types.str;
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default = name;
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description = "Domain to fetch certificate for (defaults to the entry name).";
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};
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email = mkOption {
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type = types.nullOr types.str;
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default = cfg.email;
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description = "Contact email address for the CA to be able to reach you.";
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};
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group = mkOption {
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type = types.str;
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default = "acme";
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description = "Group running the ACME client.";
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};
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postRun = mkOption {
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type = types.lines;
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default = "";
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example = "cp full.pem backup.pem";
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description = ''
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Commands to run after new certificates go live. Note that
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these commands run as the root user.
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Executed in the same directory with the new certificate.
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'';
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};
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directory = mkOption {
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type = types.str;
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readOnly = true;
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default = "/var/lib/acme/${name}";
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description = "Directory where certificate and other state is stored.";
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};
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extraDomainNames = mkOption {
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type = types.listOf types.str;
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default = [];
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example = literalExample ''
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[
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"example.org"
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"mydomain.org"
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]
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'';
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description = ''
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A list of extra domain names, which are included in the one certificate to be issued.
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'';
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};
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keyType = mkOption {
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type = types.str;
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default = "ec256";
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description = ''
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Key type to use for private keys.
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For an up to date list of supported values check the --key-type option
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at <link xlink:href="https://go-acme.github.io/lego/usage/cli/#usage"/>.
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'';
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};
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dnsProvider = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "route53";
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description = ''
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DNS Challenge provider. For a list of supported providers, see the "code"
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field of the DNS providers listed at <link xlink:href="https://go-acme.github.io/lego/dns/"/>.
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'';
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};
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credentialsFile = mkOption {
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type = types.path;
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description = ''
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Path to an EnvironmentFile for the cert's service containing any required and
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optional environment variables for your selected dnsProvider.
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To find out what values you need to set, consult the documentation at
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<link xlink:href="https://go-acme.github.io/lego/dns/"/> for the corresponding dnsProvider.
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'';
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example = "/var/src/secrets/example.org-route53-api-token";
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};
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dnsPropagationCheck = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Toggles lego DNS propagation check, which is used alongside DNS-01
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challenge to ensure the DNS entries required are available.
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'';
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};
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ocspMustStaple = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Turns on the OCSP Must-Staple TLS extension.
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Make sure you know what you're doing! See:
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<itemizedlist>
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<listitem><para><link xlink:href="https://blog.apnic.net/2019/01/15/is-the-web-ready-for-ocsp-must-staple/" /></para></listitem>
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<listitem><para><link xlink:href="https://blog.hboeck.de/archives/886-The-Problem-with-OCSP-Stapling-and-Must-Staple-and-why-Certificate-Revocation-is-still-broken.html" /></para></listitem>
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</itemizedlist>
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'';
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};
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extraLegoFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Additional global flags to pass to all lego commands.
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'';
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};
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extraLegoRenewFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Additional flags to pass to lego renew.
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'';
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};
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extraLegoRunFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Additional flags to pass to lego run.
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'';
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};
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};
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};
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in {
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options = {
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security.acme = {
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validMinDays = mkOption {
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type = types.int;
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default = 30;
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description = "Minimum remaining validity before renewal in days.";
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};
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email = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Contact email address for the CA to be able to reach you.";
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};
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renewInterval = mkOption {
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type = types.str;
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default = "daily";
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description = ''
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Systemd calendar expression when to check for renewal. See
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>.
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'';
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};
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server = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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ACME Directory Resource URI. Defaults to Let's Encrypt's
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production endpoint,
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<link xlink:href="https://acme-v02.api.letsencrypt.org/directory"/>, if unset.
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'';
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};
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preliminarySelfsigned = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether a preliminary self-signed certificate should be generated before
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doing ACME requests. This can be useful when certificates are required in
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a webserver, but ACME needs the webserver to make its requests.
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With preliminary self-signed certificate the webserver can be started and
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can later reload the correct ACME certificates.
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'';
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};
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acceptTerms = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Accept the CA's terms of service. The default provider is Let's Encrypt,
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you can find their ToS at <link xlink:href="https://letsencrypt.org/repository/"/>.
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'';
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};
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certs = mkOption {
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default = { };
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type = with types; attrsOf (submodule certOpts);
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description = ''
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Attribute set of certificates to get signed and renewed. Creates
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<literal>acme-''${cert}.{service,timer}</literal> systemd units for
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each certificate defined here. Other services can add dependencies
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to those units if they rely on the certificates being present,
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or trigger restarts of the service if certificates get renewed.
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'';
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example = literalExample ''
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{
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"example.com" = {
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webroot = "/var/www/challenges/";
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email = "foo@example.com";
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extraDomainNames = [ "www.example.com" "foo.example.com" ];
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};
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"bar.example.com" = {
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webroot = "/var/www/challenges/";
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email = "bar@example.com";
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};
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}
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'';
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};
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};
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};
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|
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imports = [
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(mkRemovedOptionModule [ "security" "acme" "production" ] ''
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Use security.acme.server to define your staging ACME server URL instead.
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|
|
|
To use the let's encrypt staging server, use security.acme.server =
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"https://acme-staging-v02.api.letsencrypt.org/directory".
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|
''
|
|
)
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|
(mkRemovedOptionModule [ "security" "acme" "directory" ] "ACME Directory is now hardcoded to /var/lib/acme and its permisisons are managed by systemd. See https://github.com/NixOS/nixpkgs/issues/53852 for more info.")
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|
(mkRemovedOptionModule [ "security" "acme" "preDelay" ] "This option has been removed. If you want to make sure that something executes before certificates are provisioned, add a RequiredBy=acme-\${cert}.service to the service you want to execute before the cert renewal")
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|
(mkRemovedOptionModule [ "security" "acme" "activationDelay" ] "This option has been removed. If you want to make sure that something executes before certificates are provisioned, add a RequiredBy=acme-\${cert}.service to the service you want to execute before the cert renewal")
|
|
(mkChangedOptionModule [ "security" "acme" "validMin" ] [ "security" "acme" "validMinDays" ] (config: config.security.acme.validMin / (24 * 3600)))
|
|
];
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|
|
|
config = mkMerge [
|
|
(mkIf (cfg.certs != { }) {
|
|
|
|
# FIXME Most of these custom warnings and filters for security.acme.certs.* are required
|
|
# because using mkRemovedOptionModule/mkChangedOptionModule with attrsets isn't possible.
|
|
warnings = filter (w: w != "") (mapAttrsToList (cert: data: if data.extraDomains != "_mkMergedOptionModule" then ''
|
|
The option definition `security.acme.certs.${cert}.extraDomains` has changed
|
|
to `security.acme.certs.${cert}.extraDomainNames` and is now a list of strings.
|
|
Setting a custom webroot for extra domains is not possible, instead use separate certs.
|
|
'' else "") cfg.certs);
|
|
|
|
assertions = let
|
|
certs = attrValues cfg.certs;
|
|
in [
|
|
{
|
|
assertion = cfg.email != null || all (certOpts: certOpts.email != null) certs;
|
|
message = ''
|
|
You must define `security.acme.certs.<name>.email` or
|
|
`security.acme.email` to register with the CA. Note that using
|
|
many different addresses for certs may trigger account rate limits.
|
|
'';
|
|
}
|
|
{
|
|
assertion = cfg.acceptTerms;
|
|
message = ''
|
|
You must accept the CA's terms of service before using
|
|
the ACME module by setting `security.acme.acceptTerms`
|
|
to `true`. For Let's Encrypt's ToS see https://letsencrypt.org/repository/
|
|
'';
|
|
}
|
|
] ++ (builtins.concatLists (mapAttrsToList (cert: data: [
|
|
{
|
|
assertion = data.user == "_mkRemovedOptionModule";
|
|
message = ''
|
|
The option definition `security.acme.certs.${cert}.user' no longer has any effect; Please remove it.
|
|
Certificate user is now hard coded to the "acme" user. If you would
|
|
like another user to have access, consider adding them to the
|
|
"acme" group or changing security.acme.certs.${cert}.group.
|
|
'';
|
|
}
|
|
{
|
|
assertion = data.allowKeysForGroup == "_mkRemovedOptionModule";
|
|
message = ''
|
|
The option definition `security.acme.certs.${cert}.allowKeysForGroup' no longer has any effect; Please remove it.
|
|
All certs are readable by the configured group. If this is undesired,
|
|
consider changing security.acme.certs.${cert}.group to an unused group.
|
|
'';
|
|
}
|
|
# * in the cert value breaks building of systemd services, and makes
|
|
# referencing them as a user quite weird too. Best practice is to use
|
|
# the domain option.
|
|
{
|
|
assertion = ! hasInfix "*" cert;
|
|
message = ''
|
|
The cert option path `security.acme.certs.${cert}.dnsProvider`
|
|
cannot contain a * character.
|
|
Instead, set `security.acme.certs.${cert}.domain = "${cert}";`
|
|
and remove the wildcard from the path.
|
|
'';
|
|
}
|
|
{
|
|
assertion = data.dnsProvider == null || data.webroot == null;
|
|
message = ''
|
|
Options `security.acme.certs.${cert}.dnsProvider` and
|
|
`security.acme.certs.${cert}.webroot` are mutually exclusive.
|
|
'';
|
|
}
|
|
]) cfg.certs));
|
|
|
|
users.users.acme = {
|
|
home = "/var/lib/acme";
|
|
group = "acme";
|
|
isSystemUser = true;
|
|
};
|
|
|
|
users.groups.acme = {};
|
|
|
|
systemd.services = {
|
|
"acme-fixperms" = userMigrationService;
|
|
} // (mapAttrs' (cert: conf: nameValuePair "acme-${cert}" conf.renewService) certConfigs)
|
|
// (optionalAttrs (cfg.preliminarySelfsigned) ({
|
|
"acme-selfsigned-ca" = selfsignCAService;
|
|
} // (mapAttrs' (cert: conf: nameValuePair "acme-selfsigned-${cert}" conf.selfsignService) certConfigs)));
|
|
|
|
systemd.timers = mapAttrs' (cert: conf: nameValuePair "acme-${cert}" conf.renewTimer) certConfigs;
|
|
|
|
# .lego and .lego/accounts specified to fix any incorrect permissions
|
|
systemd.tmpfiles.rules = [
|
|
"d /var/lib/acme/.lego - acme acme"
|
|
"d /var/lib/acme/.lego/accounts - acme acme"
|
|
] ++ (unique (concatMap (conf: [
|
|
"d ${conf.accountDir} - acme acme"
|
|
] ++ (optional (conf.webroot != null) "d ${conf.webroot}/.well-known/acme-challenge - acme ${conf.group}")
|
|
) (attrValues certConfigs)));
|
|
|
|
# Create some targets which can be depended on to be "active" after cert renewals
|
|
systemd.targets = mapAttrs' (cert: conf: nameValuePair "acme-finished-${cert}" {
|
|
wantedBy = [ "default.target" ];
|
|
requires = [ "acme-${cert}.service" ] ++ conf.selfsignedDeps;
|
|
after = [ "acme-${cert}.service" ] ++ conf.selfsignedDeps;
|
|
}) certConfigs;
|
|
})
|
|
];
|
|
|
|
meta = {
|
|
maintainers = lib.teams.acme.members;
|
|
doc = ./acme.xml;
|
|
};
|
|
}
|