From ae278d745dd8eca94374b27c1fa9a977e54c23c2 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 12 Mar 2022 18:40:38 +0100
Subject: vidhar: netboot installer

---
 installer/default.nix | 32 +++++++++++++++++
 installer/ruleset.nft | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 installer/default.nix
 create mode 100644 installer/ruleset.nft

(limited to 'installer')

diff --git a/installer/default.nix b/installer/default.nix
new file mode 100644
index 00000000..bf09c8d8
--- /dev/null
+++ b/installer/default.nix
@@ -0,0 +1,32 @@
+{ flake, pkgs, ... }: {
+  imports = with flake.nixosModules.systemProfiles; [
+    default-locale zfs networkmanager openssh
+  ];
+
+  config = {
+    networking = {
+      firewall.enable = false;
+      nftables = {
+        enable = true;
+        rulesetFile = ./ruleset.nft;
+      };
+    };
+     
+    services.openssh = {
+      enable = true;
+      staticHostKeys = false;
+    };
+
+    services.qemuGuest.enable = true;
+
+    services.resolved = {
+      llmnr = "false";
+    };
+
+    environment.systemPackages = with pkgs; [
+      nvme-cli iotop mosh
+    ];
+
+    zramSwap.enable = true;
+  };
+}
diff --git a/installer/ruleset.nft b/installer/ruleset.nft
new file mode 100644
index 00000000..4de54dd7
--- /dev/null
+++ b/installer/ruleset.nft
@@ -0,0 +1,98 @@
+define icmp_protos = {ipv6-icmp, icmp, igmp}
+
+table arp filter {
+  limit lim_arp {
+    rate over 50 mbytes/second burst 50 mbytes
+  }
+
+  chain input {
+    type filter hook input priority filter
+    policy accept
+
+    limit name lim_arp counter drop
+
+    counter
+  }
+
+  chain output {
+    type filter hook output priority filter
+    policy accept
+
+    limit name lim_arp counter drop
+
+    counter
+  }
+}
+
+table inet filter {
+  limit lim_reject {
+    rate over 1000/second burst 1000 packets
+  }
+
+  limit lim_icmp {
+    rate over 50 mbytes/second burst 50 mbytes
+  }
+
+
+  chain forward {
+    type filter hook forward priority filter
+    policy drop
+
+
+    ct state invalid log level debug prefix "drop invalid forward: " counter drop
+
+
+    iifname lo counter accept
+
+
+    limit name lim_reject log level debug prefix "drop forward: " counter drop
+    log level debug prefix "reject forward: " counter
+    meta l4proto tcp ct state new counter reject with tcp reset
+    ct state new counter reject
+
+
+    counter
+  }
+
+  chain input {
+    type filter hook input priority filter
+    policy drop
+
+
+    ct state invalid log level debug prefix "drop invalid input: " counter drop
+    
+
+    iifname lo counter accept
+    iif != lo ip daddr 127.0.0.1/8 counter reject
+    iif != lo ip6 daddr ::1/128 counter reject
+
+    meta l4proto $icmp_protos limit name lim_icmp counter drop
+    meta l4proto $icmp_protos counter accept
+
+    tcp dport 22 counter accept
+    udp dport 60000-61000 counter accept
+
+
+    limit name lim_reject log level debug prefix "drop input: " counter drop
+    log level debug prefix "reject input: " counter
+    meta l4proto tcp ct state new counter reject with tcp reset
+    ct state new counter reject
+
+
+    counter
+  }
+
+  chain output {
+    type filter hook output priority filter
+    policy accept
+
+
+    oifname lo counter accept
+
+    meta l4proto $icmp_protos limit name lim_icmp counter drop
+    meta l4proto $icmp_protos counter accept
+
+
+    counter
+  }
+}
\ No newline at end of file
-- 
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