nixops/modules/databases/default.nix

   1 { lib, pkgs, config, myconfig, mylibs, ... }:
   2 let
   3     cfg = config.services.myDatabases;
   4 in {
   5   options.services.myDatabases = {
   6     enable = lib.mkEnableOption "my databases service";
   7     postgresql = {
   8       enable = lib.mkOption {
   9         default = cfg.enable;
  10         example = true;
  11         description = "Whether to enable postgresql database";
  12         type = lib.types.bool;
  13       };
  14     };
  15
  16     mariadb = {
  17       enable = lib.mkOption {
  18         default = cfg.enable;
  19         example = true;
  20         description = "Whether to enable mariadb database";
  21         type = lib.types.bool;
  22       };
  23     };
  24
  25     redis = {
  26       enable = lib.mkOption {
  27         default = cfg.enable;
  28         example = true;
  29         description = "Whether to enable redis database";
  30         type = lib.types.bool;
  31       };
  32     };
  33   };
  34
  35   config = lib.mkIf cfg.enable {
  36     nixpkgs.config.packageOverrides = oldpkgs: rec {
  37       postgresql = postgresql111;
  38       postgresql111 = oldpkgs.postgresql100.overrideAttrs(old: rec {
  39         passthru = old.passthru // { psqlSchema = "11.0"; };
  40         name = "postgresql-11.1";
  41         src = pkgs.fetchurl {
  42           url = "mirror://postgresql/source/v11.1/${name}.tar.bz2";
  43           sha256 = "026v0sicsh7avzi45waf8shcbhivyxmi7qgn9fd1x0vl520mx0ch";
  44         };
  45         configureFlags = old.configureFlags ++ [ "--with-pam" ];
  46         buildInputs = (old.buildInputs or []) ++ [ pkgs.pam ];
  47         patches = old.patches ++ [
  48           ./postgresql_run_socket_path.patch
  49         ];
  50       });
  51       mariadb = mariadbPAM;
  52       mariadbPAM = oldpkgs.mariadb.overrideAttrs(old: rec {
  53         cmakeFlags = old.cmakeFlags ++ [ "-DWITH_AUTHENTICATION_PAM=ON" ];
  54         buildInputs = old.buildInputs ++ [ pkgs.pam ];
  55       });
  56     };
  57
  58     networking.firewall.allowedTCPPorts = [ 3306 5432 ];
  59
  60     # for adminer, ssl is implemented with mysqli only, which is
  61     # currently disabled because it’s not compatible with pam.
  62     # Thus we need to generate two users for each 'remote': one remote
  63     # with SSL, and one localhost without SSL.
  64     # User identified by LDAP:
  65     # CREATE USER foo@% IDENTIFIED VIA pam USING 'mysql' REQUIRE SSL;
  66     # CREATE USER foo@localhost IDENTIFIED VIA pam USING 'mysql';
  67     services.mysql = rec {
  68       enable = cfg.mariadb.enable;
  69       package = pkgs.mariadb;
  70       extraOptions = ''
  71         ssl_ca = ${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
  72         ssl_key = /var/lib/acme/mysql/key.pem
  73         ssl_cert = /var/lib/acme/mysql/fullchain.pem
  74         '';
  75     };
  76
  77     security.acme.certs."postgresql" = config.services.myCertificates.certConfig // {
  78       user = "postgres";
  79       group = "postgres";
  80       plugins = [ "fullchain.pem" "key.pem" "account_key.json" ];
  81       domain = "db-1.immae.eu";
  82       postRun = ''
  83         systemctl reload postgresql.service
  84       '';
  85     };
  86
  87     security.acme.certs."mysql" = config.services.myCertificates.certConfig // {
  88       user = "mysql";
  89       group = "mysql";
  90       plugins = [ "fullchain.pem" "key.pem" "account_key.json" ];
  91       domain = "db-1.immae.eu";
  92       postRun = ''
  93         systemctl restart mysql.service
  94       '';
  95     };
  96
  97     system.activationScripts.postgresql = ''
  98       install -m 0755 -o postgres -g postgres -d ${myconfig.env.databases.postgresql.socket}
  99       '';
 100
 101     services.postgresql = rec {
 102       enable = cfg.postgresql.enable;
 103       package = pkgs.postgresql;
 104       enableTCPIP = true;
 105       extraConfig = ''
 106         max_connections = 100
 107         wal_level = logical
 108         shared_buffers = 512MB
 109         work_mem = 10MB
 110         max_wal_size = 1GB
 111         min_wal_size = 80MB
 112         log_timezone = 'Europe/Paris'
 113         datestyle = 'iso, mdy'
 114         timezone = 'Europe/Paris'
 115         lc_messages = 'en_US.UTF-8'
 116         lc_monetary = 'en_US.UTF-8'
 117         lc_numeric = 'en_US.UTF-8'
 118         lc_time = 'en_US.UTF-8'
 119         default_text_search_config = 'pg_catalog.english'
 120         ssl = on
 121         ssl_cert_file = '/var/lib/acme/postgresql/fullchain.pem'
 122         ssl_key_file = '/var/lib/acme/postgresql/key.pem'
 123         '';
 124       authentication = ''
 125         local   all     postgres                                ident
 126         local   all     all                                     md5
 127         hostssl discourse       discourse       all                             md5
 128         hostssl all     all             all                     pam
 129         hostssl replication     backup-1        2001:41d0:302:1100::9:e5a9/128  pam pamservice=postgresql_replication
 130         hostssl replication     backup-1        54.37.151.137/32                pam pamservice=postgresql_replication
 131       '';
 132     };
 133
 134     security.pam.services = let
 135       pam_ldap = "${pkgs.pam_ldap}/lib/security/pam_ldap.so";
 136       pam_ldap_mysql = with myconfig.env.databases.mysql.pam;
 137         pkgs.writeText "mysql.conf" ''
 138         host ${myconfig.env.ldap.host}
 139         base ${myconfig.env.ldap.base}
 140         binddn ${dn}
 141         bindpw ${password}
 142         pam_filter ${filter}
 143         ssl start_tls
 144         '';
 145       pam_ldap_postgresql = with myconfig.env.databases.postgresql.pam;
 146         pkgs.writeText "postgresql.conf" ''
 147         host ${myconfig.env.ldap.host}
 148         base ${myconfig.env.ldap.base}
 149         binddn ${dn}
 150         bindpw ${password}
 151         pam_filter ${filter}
 152         ssl start_tls
 153         '';
 154       pam_ldap_postgresql_replication = pkgs.writeText "postgresql.conf" ''
 155         host ${myconfig.env.ldap.host}
 156         base ${myconfig.env.ldap.base}
 157         binddn ${myconfig.env.ldap.host_dn}
 158         bindpw ${myconfig.env.ldap.password}
 159         pam_login_attribute cn
 160         ssl start_tls
 161         '';
 162     in [
 163       {
 164         name = "mysql";
 165         text = ''
 166           # https://mariadb.com/kb/en/mariadb/pam-authentication-plugin/
 167           auth    required ${pam_ldap} config=${pam_ldap_mysql}
 168           account required ${pam_ldap} config=${pam_ldap_mysql}
 169           '';
 170       }
 171       {
 172         name = "postgresql";
 173         text = ''
 174           auth    required ${pam_ldap} config=${pam_ldap_postgresql}
 175           account required ${pam_ldap} config=${pam_ldap_postgresql}
 176           '';
 177       }
 178       {
 179         name = "postgresql_replication";
 180         text = ''
 181           auth    required ${pam_ldap} config=${pam_ldap_postgresql_replication}
 182           account required ${pam_ldap} config=${pam_ldap_postgresql_replication}
 183           '';
 184       }
 185     ];
 186
 187     services.redis = rec {
 188       enable = config.services.myDatabases.redis.enable;
 189       bind = "127.0.0.1";
 190       unixSocket = myconfig.env.databases.redis.socket;
 191       extraConfig = ''
 192         unixsocketperm 777
 193         maxclients 1024
 194         '';
 195     };
 196     system.activationScripts.redis = ''
 197       mkdir -p $(dirname ${myconfig.env.databases.redis.socket})
 198       chown redis $(dirname ${myconfig.env.databases.redis.socket})
 199     '';
 200   };
 201 }