1 files changed, 151 insertions, 0 deletions
diff --git a/nixos/modules/services/security/clamav.nix b/nixos/modules/services/security/clamav.nix
new file mode 100644
index 00000000000..95a0ad8770e
--- /dev/null
+++ b/nixos/modules/services/security/clamav.nix
@@ -0,0 +1,151 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  clamavUser = "clamav";
+  stateDir = "/var/lib/clamav";
+  runDir = "/run/clamav";
+  clamavGroup = clamavUser;
+  cfg = config.services.clamav;
+  pkg = pkgs.clamav;
+
+  toKeyValue = generators.toKeyValue {
+    mkKeyValue = generators.mkKeyValueDefault { } " ";
+    listsAsDuplicateKeys = true;
+  };
+
+  clamdConfigFile = pkgs.writeText "clamd.conf" (toKeyValue cfg.daemon.settings);
+  freshclamConfigFile = pkgs.writeText "freshclam.conf" (toKeyValue cfg.updater.settings);
+in
+{
+  imports = [
+    (mkRemovedOptionModule [ "services" "clamav" "updater" "config" ] "Use services.clamav.updater.settings instead.")
+    (mkRemovedOptionModule [ "services" "clamav" "updater" "extraConfig" ] "Use services.clamav.updater.settings instead.")
+    (mkRemovedOptionModule [ "services" "clamav" "daemon" "extraConfig" ] "Use services.clamav.daemon.settings instead.")
+  ];
+
+  options = {
+    services.clamav = {
+      daemon = {
+        enable = mkEnableOption "ClamAV clamd daemon";
+
+        settings = mkOption {
+          type = with types; attrsOf (oneOf [ bool int str (listOf str) ]);
+          default = { };
+          description = ''
+            ClamAV configuration. Refer to <link xlink:href="https://linux.die.net/man/5/clamd.conf"/>,
+            for details on supported values.
+          '';
+        };
+      };
+      updater = {
+        enable = mkEnableOption "ClamAV freshclam updater";
+
+        frequency = mkOption {
+          type = types.int;
+          default = 12;
+          description = ''
+            Number of database checks per day.
+          '';
+        };
+
+        interval = mkOption {
+          type = types.str;
+          default = "hourly";
+          description = ''
+            How often freshclam is invoked. See systemd.time(7) for more
+            information about the format.
+          '';
+        };
+
+        settings = mkOption {
+          type = with types; attrsOf (oneOf [ bool int str (listOf str) ]);
+          default = { };
+          description = ''
+            freshclam configuration. Refer to <link xlink:href="https://linux.die.net/man/5/freshclam.conf"/>,
+            for details on supported values.
+          '';
+        };
+      };
+    };
+  };
+
+  config = mkIf (cfg.updater.enable || cfg.daemon.enable) {
+    environment.systemPackages = [ pkg ];
+
+    users.users.${clamavUser} = {
+      uid = config.ids.uids.clamav;
+      group = clamavGroup;
+      description = "ClamAV daemon user";
+      home = stateDir;
+    };
+
+    users.groups.${clamavGroup} =
+      { gid = config.ids.gids.clamav; };
+
+    services.clamav.daemon.settings = {
+      DatabaseDirectory = stateDir;
+      LocalSocket = "${runDir}/clamd.ctl";
+      PidFile = "${runDir}/clamd.pid";
+      TemporaryDirectory = "/tmp";
+      User = "clamav";
+      Foreground = true;
+    };
+
+    services.clamav.updater.settings = {
+      DatabaseDirectory = stateDir;
+      Foreground = true;
+      Checks = cfg.updater.frequency;
+      DatabaseMirror = [ "database.clamav.net" ];
+    };
+
+    environment.etc."clamav/freshclam.conf".source = freshclamConfigFile;
+    environment.etc."clamav/clamd.conf".source = clamdConfigFile;
+
+    systemd.services.clamav-daemon = mkIf cfg.daemon.enable {
+      description = "ClamAV daemon (clamd)";
+      after = optional cfg.updater.enable "clamav-freshclam.service";
+      wantedBy = [ "multi-user.target" ];
+      restartTriggers = [ clamdConfigFile ];
+
+      preStart = ''
+        mkdir -m 0755 -p ${runDir}
+        chown ${clamavUser}:${clamavGroup} ${runDir}
+      '';
+
+      serviceConfig = {
+        ExecStart = "${pkg}/bin/clamd";
+        ExecReload = "${pkgs.coreutils}/bin/kill -USR2 $MAINPID";
+        PrivateTmp = "yes";
+        PrivateDevices = "yes";
+        PrivateNetwork = "yes";
+      };
+    };
+
+    systemd.timers.clamav-freshclam = mkIf cfg.updater.enable {
+      description = "Timer for ClamAV virus database updater (freshclam)";
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        OnCalendar = cfg.updater.interval;
+        Unit = "clamav-freshclam.service";
+      };
+    };
+
+    systemd.services.clamav-freshclam = mkIf cfg.updater.enable {
+      description = "ClamAV virus database updater (freshclam)";
+      restartTriggers = [ freshclamConfigFile ];
+      after = [ "network-online.target" ];
+      preStart = ''
+        mkdir -m 0755 -p ${stateDir}
+        chown ${clamavUser}:${clamavGroup} ${stateDir}
+      '';
+
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = "${pkg}/bin/freshclam";
+        SuccessExitStatus = "1"; # if databases are up to date
+        PrivateTmp = "yes";
+        PrivateDevices = "yes";
+      };
+    };
+  };
+}