podman and opensnitch

modules/packages.nix

@@ -88,7 +88,7 @@
     awscli2
     # azure-cli
     google-cloud-sdk
-    docker-compose
+    podman-compose
     argocd
     fluxcd
     kubectx         # switch between contexts/namespaces

modules/programs.nix

@@ -43,6 +43,10 @@
   virtualisation.libvirtd.enable = true;
   programs.virt-manager.enable = true;
 
-  # Docker
-  virtualisation.docker.enable = true;
+  # Container Runtimes
+  virtualisation.podman = {
+    enable = true;
+    dockerCompat = true;
+    defaultNetwork.settings.dns_enabled = true;
+  };
 }

modules/security.nix

@@ -5,13 +5,10 @@
     ./usb-devices.nix
   ];
 
-  # Use the hardened kernel for better security
   boot.kernelPackages = lib.mkForce pkgs.linuxPackages_hardened;
 
-  # Only allow members of the wheel group to execute sudo
   security.sudo.execWheelOnly = true;
 
-  # Linux Audit Framework
   security.auditd.enable = true;
   security.audit.enable = true;
   security.audit.rules = [
@@ -20,10 +17,8 @@
     "-w /etc/shadow -p wa -k shadow_changes"
   ];
 
-  # Kernel Hardening
   security.protectKernelImage = true;
 
-  # Sysctl hardening
   boot.kernel.sysctl = {
     "kernel.dmesg_restrict" = 1;
     "kernel.kptr_restrict" = 2;
@@ -42,13 +37,15 @@
     "net.ipv6.conf.default.accept_redirects" = 0;
   };
 
-  # USBGuard configuration
   services.usbguard = {
     enable = true;
     dbus.enable = true;
     implicitPolicyTarget = "block";
   };
 
+  # OpenSnitch Application Firewall
+  services.opensnitch.enable = true;
+
   security.pam.loginLimits = [
     { domain = "*"; item = "core"; type = "-"; value = "0"; }
   ];
@@ -58,7 +55,7 @@
     RestrictAddressFamilies = "AF_UNIX AF_NETLINK";
   };
 
-  # Podman socket for all users
+  # Declaratively enable Podman socket for all users
   systemd.user.sockets.podman.wantedBy = [ "sockets.target" ];
 
   virtualisation = {
@@ -84,5 +81,7 @@
     lynis
     audit
     tcpdump
+    bandwhich
+    opensnitch-ui
   ];
 }

modules/users.nix

@@ -8,7 +8,7 @@
   users.users.asxpi = {
     isNormalUser = true;
     description = "Sergei P";
-    extraGroups = [ "networkmanager" "wheel" "dialout" "libvirtd" "docker" ];
+    extraGroups = [ "networkmanager" "wheel" "dialout" "libvirtd" "podman" ];
     shell = pkgs.zsh;
     packages = with pkgs; [
       # Internet