hosts/vps/configuration.nix

@@ -30,7 +30,7 @@
     };
   };
   environment.etc."iptables.rules".source = ../../iptables;
-  networking.firewall.enable = false;
+  networking.firewall.enable = lib.mkForce false;
   networking.nftables.enable = false;
   systemd.services.iptables-restore = {
     description = "Apply iptables ruleset";

iptables

@@ -0,0 +1,126 @@
+# Generated by iptables-save v1.8.11 (nf_tables) on Fri Jan  2 03:44:23 2026
+*mangle
+:PREROUTING ACCEPT [95853893:179831236298]
+:INPUT ACCEPT [94316554:179510512585]
+:FORWARD ACCEPT [1536524:320567864]
+:OUTPUT ACCEPT [49857522:93072472240]
+:POSTROUTING ACCEPT [51393797:93393029789]
+COMMIT
+# Completed on Fri Jan  2 03:44:23 2026
+# Generated by iptables-save v1.8.11 (nf_tables) on Fri Jan  2 03:44:23 2026
+*raw
+:PREROUTING ACCEPT [95853893:179831236298]
+:OUTPUT ACCEPT [49857522:93072472240]
+COMMIT
+# Completed on Fri Jan  2 03:44:23 2026
+# Generated by iptables-save v1.8.11 (nf_tables) on Fri Jan  2 03:44:23 2026
+*filter
+:INPUT ACCEPT [94315678:179510353216]
+:FORWARD ACCEPT [46534:2774394]
+:OUTPUT ACCEPT [49857520:93072471971]
+
+
+# --- Incoming (INPUT) rules for VPS itself ---
+# Accept SSH on port 3456 (new SSH port)
+# allow SSH to VPS
+-A INPUT -p tcp --dport 3456 -m conntrack --ctstate NEW -j ACCEPT
+
+# allow established connections (responses)
+-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+
+# (Optionally, add other INPUT rules for any services the VPS itself runs, if any, like HTTP/HTTPS if needed)
+
+# If a default DROP policy is desired on INPUT, or an explicit drop rule:
+# -A INPUT -j DROP   # (optional: lock down any other input)
+
+# --- Forwarding (FORWARD) rules for VPN traffic ---
+# allow return traffic for established sessions
+-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+
+# Syncthing between 10.8.0.2 and home server
+# 10.8.0.2 -> 10.77.0.0 Syncthing
+-A FORWARD -s 10.8.0.2/32 -d 10.77.0.2/32 -p tcp --dport 22000 -j ACCEPT
+-A FORWARD -s 10.8.0.3/32 -d 10.77.0.2/32 -p tcp --dport 22000 -j ACCEPT
+-A FORWARD -s 10.8.0.4/32 -d 10.77.0.2/32 -p tcp --dport 22000 -j ACCEPT
+-A FORWARD -s 10.8.0.5/32 -d 10.77.0.2/32 -p tcp --dport 22000 -j ACCEPT
+# home -> 10.8.0.0 Syncthing
+-A FORWARD -s 10.77.0.2/32 -d 10.8.0.2/32 -p tcp --dport 22000 -j ACCEPT
+-A FORWARD -s 10.77.0.2/32 -d 10.8.0.3/32 -p tcp --dport 22000 -j ACCEPT
+-A FORWARD -s 10.77.0.2/32 -d 10.8.0.4/32 -p tcp --dport 22000 -j ACCEPT
+-A FORWARD -s 10.77.0.2/32 -d 10.8.0.5/32 -p tcp --dport 22000 -j ACCEPT
+
+# Matrix/Synapse access from 10.8 subnet to home server
+# allow Matrix client port
+-A FORWARD -s 10.8.0.0/24 -d 10.77.0.2/32 -p tcp --dport 8008 -j ACCEPT
+# allow Matrix federation port
+-A FORWARD -s 10.8.0.0/24 -d 10.77.0.2/32 -p tcp --dport 8448 -j ACCEPT
+# allow TURN/other (if used)
+-A FORWARD -s 10.8.0.0/24 -d 10.77.0.2/32 -p tcp --dport 8999 -j ACCEPT
+
+# ICMP between 10.8 subnet and home
+# ping home from 10.8 clients
+-A FORWARD -s 10.8.0.0/24 -d 10.77.0.2/32 -p icmp -j ACCEPT
+# ping 10.8 clients from home
+-A FORWARD -s 10.77.0.2/32 -d 10.8.0.0/24 -p icmp -j ACCEPT
+
+# New Friend's subnet (10.9) access rule
+# allow new subnet to access port 9999 on home
+-A FORWARD -s 10.9.0.2/24 -d 10.77.0.2/32 -p tcp --dport 9999 -j ACCEPT
+# allow ping to home
+-A FORWARD -s 10.9.0.2/24 -d 10.77.0.2/32 -p icmp -j ACCEPT
+# allow ping reply from home
+-A FORWARD -s 10.77.0.2/32 -d 10.9.0.2/24 -p icmp -j ACCEPT
+
+# Allow VPN subnets to reach Internet (MASQUERADE will SNAT them)
+# 10.8 clients to internet
+-A FORWARD -s 10.8.0.0/24 -o eth0 -j ACCEPT
+# 10.9 clients to internet
+-A FORWARD -s 10.9.0.2/24 -o eth0 -j ACCEPT
+
+# Drop all other traffic between these subnets and home or between subnets (isolation)
+# drop any 10.8 -> home not allowed
+-A FORWARD -s 10.8.0.0/24 -d 10.77.0.0/24 -j DROP
+# drop any home -> 10.8 not allowed
+-A FORWARD -s 10.77.0.0/24 -d 10.8.0.0/24 -j DROP
+
+# drop any 10.9 -> home not allowed (except 9999/ping above)
+-A FORWARD -s 10.9.0.0/24 -d 10.77.0.0/24 -j DROP
+# drop any home -> 10.9 not allowed
+-A FORWARD -s 10.77.0.0/24 -d 10.9.0.0/24 -j DROP
+
+# drop 10.9 -> 10.8 (no client-to-client)
+-A FORWARD -s 10.9.0.0/24 -d 10.8.0.0/24 -j DROP
+# drop 10.8 -> 10.9
+-A FORWARD -s 10.8.0.0/24 -d 10.9.0.0/24 -j DROP
+
+COMMIT
+
+*nat
+:PREROUTING ACCEPT [3368888:178175988]
+:INPUT ACCEPT [3348703:174454011]
+:OUTPUT ACCEPT [30120:1902454]
+:POSTROUTING ACCEPT [32339:2018208]
+# Port forwarding (DNAT) rules:
+# forward SSH (port 22) to home server
+-A PREROUTING -p tcp --dport 22 -j DNAT --to-destination 10.77.0.2:22
+# forward port 51412 to home (TCP)
+-A PREROUTING -p tcp --dport 51412 -j DNAT --to-destination 10.77.0.2:51412
+# forward port 51412 to home (UDP)
+-A PREROUTING -p udp --dport 51412 -j DNAT --to-destination 10.77.0.2:51412
+# (Remove the above 51412 rules if not used; keep 22 as it’s for Gitea’s SSH access)
+
+# Masquerade (SNAT) rules:
+# masquerade replies from home for SSH
+-A POSTROUTING -d 10.77.0.2/32 -p tcp --dport 22 -j MASQUERADE
+# masquerade replies for 51412 (TCP)
+-A POSTROUTING -d 10.77.0.2/32 -p tcp --dport 51412 -j MASQUERADE
+#masquerade replies for 51412 (UDP)
+-A POSTROUTING -d 10.77.0.2/32 -p udp --dport 51412 -j MASQUERADE
+# (If 51412 rules removed above, remove their masquerade lines too)
+
+# NAT for 10.8.0.x clients to internet
+-A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
+# NAT for 10.9.0.x clients to internet
+-A POSTROUTING -s 10.9.0.0/24 -o eth0 -j MASQUERADE
+
+COMMIT