modules/private/certificates.nix

   1 { lib, pkgs, config, name, ... }:
   2 {
   3   options.myServices.certificates = {
   4     enable = lib.mkEnableOption "enable certificates";
   5     certConfig = lib.mkOption {
   6       default = {
   7         webroot = "/var/lib/acme/acme-challenges";
   8         email = "ismael@bouya.org";
   9         postRun = builtins.concatStringsSep "\n" [
  10           (lib.optionalString config.services.httpd.Prod.enable "systemctl reload httpdProd.service")
  11           (lib.optionalString config.services.httpd.Tools.enable "systemctl reload httpdTools.service")
  12           (lib.optionalString config.services.httpd.Inte.enable "systemctl reload httpdInte.service")
  13           (lib.optionalString config.services.nginx.enable "systemctl reload nginx.service")
  14         ];
  15       };
  16       description = "Default configuration for certificates";
  17     };
  18   };
  19
  20   config = lib.mkIf config.myServices.certificates.enable {
  21     services.duplyBackup.profiles.system.excludeFile = ''
  22       + /var/lib/acme/acme-challenges
  23       '';
  24     services.nginx = {
  25       recommendedTlsSettings = true;
  26       virtualHosts = {
  27         "${config.hostEnv.fqdn}" = {
  28           acmeRoot = config.security.acme.certs."${name}".webroot;
  29           useACMEHost = name;
  30           forceSSL = true;
  31         };
  32       };
  33     };
  34     services.websites.certs = config.myServices.certificates.certConfig;
  35     myServices.databasesCerts = config.myServices.certificates.certConfig;
  36     myServices.ircCerts = config.myServices.certificates.certConfig;
  37
  38     security.acme.acceptTerms = true;
  39     security.acme.preliminarySelfsigned = true;
  40
  41     security.acme.certs = {
  42       "${name}" = config.myServices.certificates.certConfig // {
  43         domain = config.hostEnv.fqdn;
  44       };
  45     };
  46
  47     systemd.services = lib.attrsets.mapAttrs' (k: v:
  48       lib.attrsets.nameValuePair "acme-selfsigned-${k}" { script = lib.mkBefore ''
  49         cp $workdir/server.crt ${config.security.acme.certs."${k}".directory}/cert.pem
  50         chown '${v.user}:${v.group}' ${config.security.acme.certs."${k}".directory}/cert.pem
  51         chmod ${if v.allowKeysForGroup then "750" else "700"} ${config.security.acme.certs."${k}".directory}/cert.pem
  52
  53         cp $workdir/ca.crt ${config.security.acme.certs."${k}".directory}/chain.pem
  54         chown '${v.user}:${v.group}' ${config.security.acme.certs."${k}".directory}/chain.pem
  55         chmod ${if v.allowKeysForGroup then "750" else "700"} ${config.security.acme.certs."${k}".directory}/chain.pem
  56         '';
  57       }
  58     ) config.security.acme.certs //
  59     lib.attrsets.mapAttrs' (k: data:
  60       lib.attrsets.nameValuePair "acme-${k}" {
  61         serviceConfig.ExecStartPre =
  62           let
  63             script = pkgs.writeScript "acme-pre-start" ''
  64               #!${pkgs.runtimeShell} -e
  65               mkdir -p '${data.webroot}/.well-known/acme-challenge'
  66               chmod a+w '${data.webroot}/.well-known/acme-challenge'
  67               #doesn't work for multiple concurrent runs
  68               #chown -R '${data.user}:${data.group}' '${data.webroot}/.well-known/acme-challenge'
  69             '';
  70           in
  71           "+${script}";
  72         # This is a workaround to
  73         # https://github.com/NixOS/nixpkgs/issues/84409
  74         # https://github.com/NixOS/nixpkgs/issues/84633
  75         serviceConfig.RemainAfterExit = lib.mkForce false;
  76         serviceConfig.WorkingDirectory = lib.mkForce "/var/lib/acme/${k}/.lego";
  77         serviceConfig.StateDirectory = lib.mkForce "acme/${k}/.lego acme/${k}";
  78         serviceConfig.ExecStartPost =
  79           let
  80             keyName = builtins.replaceStrings ["*"] ["_"] data.domain;
  81             fileMode = if data.allowKeysForGroup then "640" else "600";
  82             spath = "/var/lib/acme/${k}/.lego";
  83             script = pkgs.writeScript "acme-post-start" ''
  84               #!${pkgs.runtimeShell} -e
  85               cd /var/lib/acme/${k}
  86
  87               # Test that existing cert is older than new cert
  88               KEY=${spath}/certificates/${keyName}.key
  89               if [ -e $KEY -a $KEY -nt key.pem ]; then
  90                 cp -p ${spath}/certificates/${keyName}.key key.pem
  91                 cp -p ${spath}/certificates/${keyName}.crt fullchain.pem
  92                 cp -p ${spath}/certificates/${keyName}.issuer.crt chain.pem
  93                 ln -sf fullchain.pem cert.pem
  94                 cat key.pem fullchain.pem > full.pem
  95
  96                 ${data.postRun}
  97               fi
  98
  99               chmod ${fileMode} *.pem
 100               chown '${data.user}:${data.group}' *.pem
 101             '';
 102           in
 103             lib.mkForce "+${script}";
 104
 105       }
 106     ) config.security.acme.certs //
 107     {
 108       httpdProd = lib.mkIf config.services.httpd.Prod.enable
 109         { after = [ "acme-selfsigned-certificates.target" ]; wants = [ "acme-selfsigned-certificates.target" ]; };
 110       httpdTools = lib.mkIf config.services.httpd.Tools.enable
 111         { after = [ "acme-selfsigned-certificates.target" ]; wants = [ "acme-selfsigned-certificates.target" ]; };
 112       httpdInte = lib.mkIf config.services.httpd.Inte.enable
 113         { after = [ "acme-selfsigned-certificates.target" ]; wants = [ "acme-selfsigned-certificates.target" ]; };
 114     };
 115   };
 116 }