From cf3b62e01e02806fdfc46dfc761ea20a67049bea Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Thu, 22 Aug 2024 22:58:48 +0200
Subject: [PATCH 1/3] bekkalokk/phpfpm-*: systemd hardening

---
 hosts/bekkalokk/configuration.nix   |  1 +
 hosts/bekkalokk/services/phpfpm.nix | 51 +++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 hosts/bekkalokk/services/phpfpm.nix

diff --git a/hosts/bekkalokk/configuration.nix b/hosts/bekkalokk/configuration.nix
index bbc3c6b..ff2f1af 100644
--- a/hosts/bekkalokk/configuration.nix
+++ b/hosts/bekkalokk/configuration.nix
@@ -11,6 +11,7 @@
     ./services/kerberos
     ./services/mediawiki
     ./services/nginx.nix
+    ./services/phpfpm.nix
     ./services/vaultwarden.nix
     ./services/webmail
     ./services/website
diff --git a/hosts/bekkalokk/services/phpfpm.nix b/hosts/bekkalokk/services/phpfpm.nix
new file mode 100644
index 0000000..d796ff7
--- /dev/null
+++ b/hosts/bekkalokk/services/phpfpm.nix
@@ -0,0 +1,51 @@
+{ lib, ... }:
+let
+  pools = map (pool: "phpfpm-${pool}") [
+    "idp"
+    "mediawiki"
+    "pvv-nettsiden"
+    "roundcube"
+    "snappymail"
+  ];
+in
+{
+  # Source: https://www.pierreblazquez.com/2023/06/17/how-to-harden-apache-php-fpm-daemons-using-systemd/
+  systemd.services = lib.genAttrs pools (_: {
+    serviceConfig = let
+      caps = [
+        "CAP_NET_BIND_SERVICE"
+        "CAP_SETGID"
+        "CAP_SETUID"
+        "CAP_CHOWN"
+        "CAP_KILL"
+        "CAP_IPC_LOCK"
+        "CAP_DAC_OVERRIDE"
+      ];
+    in {
+      AmbientCapabilities = caps;
+      CapabilityBoundingSet = caps;
+      DeviceAllow = [ "" ];
+      LockPersonality = true;
+      MemoryDenyWriteExecute = false;
+      NoNewPrivileges = true;
+      PrivateMounts = true;
+      ProtectClock = true;
+      ProtectControlGroups = true;
+      ProtectHome = true;
+      ProtectHostname = true;
+      ProtectKernelLogs = true;
+      ProtectKernelModules = true;
+      ProtectKernelTunables = true;
+      RemoveIPC = true;
+      UMask = "0077";
+      RestrictNamespaces = "~mnt";
+      RestrictRealtime = true;
+      RestrictSUIDSGID = true;
+      SystemCallArchitectures = "native";
+      KeyringMode = "private";
+      SystemCallFilter = [
+        "@system-service"
+      ];
+    };
+  });
+}
-- 
2.44.1


From 945d53cdb4e515ef25914c9c0cadc7c5f20ddfa2 Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Thu, 22 Aug 2024 22:59:32 +0200
Subject: [PATCH 2/3] bekkalokk/vaultwarden: systemd hardening

---
 hosts/bekkalokk/services/vaultwarden.nix | 36 ++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/hosts/bekkalokk/services/vaultwarden.nix b/hosts/bekkalokk/services/vaultwarden.nix
index 13722ce..f4a7477 100644
--- a/hosts/bekkalokk/services/vaultwarden.nix
+++ b/hosts/bekkalokk/services/vaultwarden.nix
@@ -65,4 +65,40 @@ in {
       proxyWebsockets = true;
     };
   };
+
+  systemd.services.vaultwarden = lib.mkIf cfg.enable {
+    serviceConfig = {
+      AmbientCapabilities = [ "" ];
+      CapabilityBoundingSet = [ "" ];
+      DeviceAllow = [ "" ];
+      LockPersonality = true;
+      NoNewPrivileges = true;
+      # MemoryDenyWriteExecute = true;
+      PrivateMounts = true;
+      PrivateUsers = true;
+      ProcSubset = "pid";
+      ProtectClock = true;
+      ProtectControlGroups = true;
+      ProtectHostname = true;
+      ProtectKernelLogs = true;
+      ProtectKernelModules = true;
+      ProtectKernelTunables = true;
+      ProtectProc = "invisible";
+      RestrictAddressFamilies = [
+        "AF_INET"
+        "AF_INET6"
+        "AF_UNIX"
+      ];
+      RemoveIPC = true;
+      RestrictNamespaces = true;
+      RestrictRealtime = true;
+      RestrictSUIDSGID = true;
+      SystemCallArchitectures = "native";
+      SystemCallFilter = [
+        "@system-service"
+        "~@privileged"
+      ];
+      UMask = "0007";
+    };
+  };
 }
-- 
2.44.1


From ef418bf1255f62e91ae0fd7e3ecc62890c795baf Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Thu, 22 Aug 2024 23:00:45 +0200
Subject: [PATCH 3/3] base/logrotate: systemd hardening + more

---
 base.nix | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/base.nix b/base.nix
index 4b1e171..9733a7f 100644
--- a/base.nix
+++ b/base.nix
@@ -133,6 +133,46 @@
     extraConfig = "return 444;";
   };
 
+  # source: https://github.com/logrotate/logrotate/blob/main/examples/logrotate.service
+  systemd.services.logrotate = {
+    documentation = [ "man:logrotate(8)" "man:logrotate.conf(5)" ];
+    unitConfig.RequiresMountsFor = "/var/log";
+    serviceConfig = {
+      Nice = 19;
+      IOSchedulingClass = "best-effort";
+      IOSchedulingPriority = 7;
+
+      ReadWritePaths = [ "/var/log" ];
+
+      AmbientCapabilities = [ "" ];
+      CapabilityBoundingSet = [ "" ];
+      DeviceAllow = [ "" ];
+      LockPersonality = true;
+      MemoryDenyWriteExecute = true;
+      NoNewPrivileges = true; # disable for third party rotate scripts
+      PrivateDevices = true;
+      PrivateNetwork = true; # disable for mail delivery
+      PrivateTmp = true;
+      ProtectClock = true;
+      ProtectControlGroups = true;
+      ProtectHome = true; # disable for userdir logs
+      ProtectHostname = true;
+      ProtectKernelLogs = true;
+      ProtectKernelModules = true;
+      ProtectKernelTunables = true;
+      ProtectProc = "invisible";
+      ProtectSystem = "full";
+      RestrictNamespaces = true;
+      RestrictRealtime = true;
+      RestrictSUIDSGID = true; # disable for creating setgid directories
+      SocketBindDeny = [ "any" ];
+      SystemCallArchitectures = "native";
+      SystemCallFilter = [
+        "@system-service"
+      ];
+    };
+  };
+
   networking.firewall.allowedTCPPorts = lib.mkIf config.services.nginx.enable [ 80 443 ];
 
   security.acme = {
-- 
2.44.1