security options update

- use icons for jailed firefox and chromium from icon pack
- users options set to default in all VMs
- KASLR option removed as it is by default enabled in kernel
- sysrq disabled only in release build
- fail2ban enabled in net-vm only

Signed-off-by: Ganga Ram <Ganga.Ram@tii.ae>

modules/common/security/firejail/default.nix

@@ -52,14 +52,14 @@ in {
 
       launchers =
         lib.optional cfg.apps.firefox.enable {
-          name = "firefox-safe";
+          name = "Firefox-safe";
           path = "/run/current-system/sw/bin/firefox";
-          icon = "${../../../assets/icons/png/firefox.png}";
+          icon = "${pkgs.icon-pack}/firefox.svg";
         }
         ++ lib.optional cfg.apps.chromium.enable {
-          name = "chromium";
+          name = "Chromium-safe";
           path = "/run/current-system/sw/bin/chromium";
-          icon = "${../../../assets/icons/png/chromium.png}";
+          icon = "${pkgs.icon-pack}/chromium.svg";
         };
     };
 

modules/common/security/system.nix

@@ -16,7 +16,7 @@ in {
             Enforce Strong password for each user.
           '';
           type = lib.types.bool;
-          default = false;
+          default = true;
         };
 
         min-passwd-len = lib.mkOption {
@@ -28,14 +28,6 @@ in {
         };
       };
 
-      encrypt_home.enable = lib.mkOption {
-        description = ''
-          Enable encryption of user's data stored in 'Home' directory.
-        '';
-        type = lib.types.bool;
-        default = false;
-      };
-
       root.enable = lib.mkOption {
         description = ''
           Disable root login.
@@ -123,16 +115,6 @@ in {
           type = lib.types.bool;
           default = false;
         };
-        enableASLR = lib.mkOption {
-          description = ''
-            Randomize user virtual address space. It disrupts the
-            predictability of memory layouts and makes it harder for
-            attackers to exploit memory related vulnerabilities.
-            May slightly impact performance, may increase boot time.
-          '';
-          type = lib.types.bool;
-          default = false;
-        };
         randomizePageFreeList = lib.mkOption {
           description = ''
             Randomize free memory pages managed by the page allocator.
@@ -167,7 +149,7 @@ in {
 
       # There is no possible string to hash to just “!”
       users.users.root = lib.mkIf (!cfg.users.root.enable) {
-        hashedPassword = lib.mkForce "!";
+        shell = "${pkgs.shadow}/bin/nologin";
       };
 
       # Enforce strong password
@@ -187,9 +169,6 @@ in {
             '';
           };
         };
-
-        # Encrypt user's data stored in 'Home' directory
-        enableFscrypt = cfg.users.encrypt_home.enable;
       };
 
       ## sudo administartion
@@ -249,9 +228,6 @@ in {
         # Disable ftrace
         "kernel.ftrace_enabled" = lib.mkDefault false;
 
-        # Randomize address space including heap
-        "kernel.randomize_va_space" = lib.mkIf (cfg.system-security.misc.enableASLR || cfg.system-security.misc.enable-all) (lib.mkForce 2);
-
         # Restrict core dump
         "fs.suid_dumpable" = lib.mkForce 0;
 
@@ -262,7 +238,7 @@ in {
         "vm.unprivileged_userfaultfd" = lib.mkForce 0;
 
         # Disable SysRq key
-        "kernel.sysrq" = lib.mkForce 0;
+        "kernel.sysrq" = lib.mkIf config.ghaf.profiles.release.enable (lib.mkForce 0);
 
         # Disable loading of line descipline kernel module of TTY device
         # The line descipline module provides an interface between the low-level driver handling a TTY device

modules/microvm/virtualization/microvm/adminvm.nix

@@ -33,14 +33,10 @@
             withDebug = configHost.ghaf.profiles.debug.enable;
           };
           security = {
-            users.strong-password.enable = true;
-            users.root.enable = false;
-            users.sudo.enable = true;
             system-security.enable = true;
             system-security.lock-kernel-modules = lib.mkDefault configHost.ghaf.profiles.release.enable;
             network.ipsecurity.enable = true;
             network.bpf-access-level = lib.mkForce 1; # Provide BPF access to privileged users
-            fail2ban.enable = true;
           };
         };
 

modules/microvm/virtualization/microvm/appvm.nix

@@ -66,14 +66,10 @@
               withHardenedConfigs = true;
             };
             security = {
-              users.strong-password.enable = true;
-              users.root.enable = false;
-              users.sudo.enable = true;
               system-security.enable = true;
               system-security.lock-kernel-modules = lib.mkDefault configHost.ghaf.profiles.release.enable;
               network.ipsecurity.enable = true;
               network.bpf-access-level = lib.mkForce 1; # Provide BPF access to privileged users
-              fail2ban.enable = true;
             };
           };
 

modules/microvm/virtualization/microvm/audiovm.nix

@@ -39,14 +39,10 @@
           };
           services.audio.enable = true;
           security = {
-            users.strong-password.enable = true;
-            users.root.enable = false;
-            users.sudo.enable = true;
             system-security.enable = true;
             system-security.lock-kernel-modules = lib.mkDefault configHost.ghaf.profiles.release.enable;
             network.ipsecurity.enable = true;
             network.bpf-access-level = lib.mkForce 1; # Provide BPF access to privileged users
-            fail2ban.enable = true;
           };
         };
 

modules/microvm/virtualization/microvm/guivm.nix

@@ -47,14 +47,10 @@
           };
 
           security = {
-            users.strong-password.enable = true;
-            users.root.enable = false;
-            users.sudo.enable = true;
             system-security.enable = true;
             system-security.lock-kernel-modules = lib.mkDefault configHost.ghaf.profiles.release.enable;
             network.ipsecurity.enable = true;
             network.bpf-access-level = lib.mkForce 1; # Provide BPF access to privileged users
-            fail2ban.enable = true;
           };
         };
 

modules/microvm/virtualization/microvm/microvm-host.nix

@@ -33,14 +33,10 @@ in {
         withHardenedConfigs = true;
       };
       security = {
-        users.strong-password.enable = true;
-        users.root.enable = false;
-        users.sudo.enable = true;
         system-security.enable = true;
         system-security.lock-kernel-modules = lib.mkDefault config.ghaf.profiles.release.enable;
         network.ipsecurity.enable = true;
         network.bpf-access-level = lib.mkForce 1; # Provide BPF access to privileged users
-        fail2ban.enable = true;
       };
     };
 

modules/microvm/virtualization/microvm/netvm.nix

@@ -44,9 +44,6 @@
             withHardenedConfigs = true;
           };
           security = {
-            users.strong-password.enable = true;
-            users.root.enable = false;
-            users.sudo.enable = true;
             system-security.enable = true;
             system-security.lock-kernel-modules = lib.mkDefault configHost.ghaf.profiles.release.enable;
             network.ipsecurity.enable = true;