Move databases configs to modules

[perso/Immae/Config/Nix.git] / modules / private / databases / mariadb.nix

diff --git a/modules/private/databases/mariadb.nix b/modules/private/databases/mariadb.nix
new file mode 100644 (file)
index 0000000..21f4359
--- /dev/null
+++ b/modules/private/databases/mariadb.nix
@@ -0,0 +1,125 @@
+{ lib, pkgs, config, myconfig,  ... }:
+let
+    cfg = config.myServices.databases.mariadb;
+in {
+  options.myServices.databases = {
+    mariadb = {
+      enable = lib.mkOption {
+        default = cfg.enable;
+        example = true;
+        description = "Whether to enable mariadb database";
+        type = lib.types.bool;
+      };
+      dataDir = lib.mkOption {
+        type = lib.types.path;
+        default = "/var/lib/mysql";
+        description = ''
+          The directory where Mariadb stores its data.
+        '';
+      };
+      # Output variables
+      socketsDir = lib.mkOption {
+        type = lib.types.path;
+        default = "/run/mysqld";
+        description = ''
+          The directory where Mariadb puts sockets.
+          '';
+      };
+      sockets = lib.mkOption {
+        type = lib.types.attrsOf lib.types.path;
+        default = {
+          mysqld  = "${cfg.socketsDir}/mysqld.sock";
+        };
+        readOnly = true;
+        description = ''
+          Mariadb sockets
+          '';
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    networking.firewall.allowedTCPPorts = [ 3306 ];
+
+    # for adminer, ssl is implemented with mysqli only, which is
+    # currently disabled because it’s not compatible with pam.
+    # Thus we need to generate two users for each 'remote': one remote
+    # with SSL, and one localhost without SSL.
+    # User identified by LDAP:
+    # CREATE USER foo@% IDENTIFIED VIA pam USING 'mysql' REQUIRE SSL;
+    # CREATE USER foo@localhost IDENTIFIED VIA pam USING 'mysql';
+    services.mysql = {
+      enable = true;
+      package = pkgs.mariadb;
+      dataDir = cfg.dataDir;
+      extraOptions = ''
+        ssl_ca = ${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
+        ssl_key = /var/lib/acme/mysql/key.pem
+        ssl_cert = /var/lib/acme/mysql/fullchain.pem
+        '';
+    };
+
+    users.users.mysql.extraGroups = [ "keys" ];
+    security.acme.certs."mysql" = config.myServices.databasesCerts // {
+      user = "mysql";
+      group = "mysql";
+      plugins = [ "fullchain.pem" "key.pem" "account_key.json" ];
+      domain = "db-1.immae.eu";
+      postRun = ''
+        systemctl restart mysql.service
+      '';
+    };
+
+    secrets.keys = [
+      {
+        dest = "mysql/mysqldump";
+        permissions = "0400";
+        user = "root";
+        group = "root";
+        text = ''
+          [mysqldump]
+          user = root
+          password = ${myconfig.env.databases.mysql.systemUsers.root}
+        '';
+      }
+      {
+        dest = "mysql/pam";
+        permissions = "0400";
+        user = "mysql";
+        group = "mysql";
+        text = with myconfig.env.databases.mysql.pam; ''
+          host ${myconfig.env.ldap.host}
+          base ${myconfig.env.ldap.base}
+          binddn ${dn}
+          bindpw ${password}
+          pam_filter ${filter}
+          ssl start_tls
+          '';
+      }
+    ];
+
+    services.cron = {
+      enable = true;
+      systemCronJobs = [
+        ''
+          30 1,13 * * * root ${pkgs.mariadb}/bin/mysqldump --defaults-file=${config.secrets.location}/mysql/mysqldump --all-databases > ${cfg.dataDir}/backup.sql
+        ''
+      ];
+    };
+
+    security.pam.services = let
+      pam_ldap = "${pkgs.pam_ldap}/lib/security/pam_ldap.so";
+    in [
+      {
+        name = "mysql";
+        text = ''
+          # https://mariadb.com/kb/en/mariadb/pam-authentication-plugin/
+          auth    required ${pam_ldap} config=${config.secrets.location}/mysql/pam
+          account required ${pam_ldap} config=${config.secrets.location}/mysql/pam
+          '';
+      }
+    ];
+
+  };
+}
+