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firewall.sh

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May 30th, 2021
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  1. #!/bin/bash
  2.  
  3. SPECIAL_ADDRS='255.255.255.255/32 240.0.0.0/4 233.252.0.0/24 224.0.0.0/4 203.0.113.0/24 198.51.100.0/24 198.18.0.0/15 192.168.0.0/16 192.88.99.0/24 192.0.2.0/24 192.0.0.0/24 172.16.0.0/12 169.254.0.0/16 127.0.0.0/8 100.64.0.0/10 10.0.0.0/8 0.0.0.0/8'
  4.  
  5. # ---
  6.  
  7. apt update
  8. apt install tor
  9.  
  10. # ---
  11.  
  12. iptables -P INPUT DROP; iptables -P FORWARD DROP; iptables -P OUTPUT DROP
  13.  
  14. # ---
  15.  
  16. iptables -A INPUT -m state --state INVALID -j DROP
  17. iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
  18. iptables -A INPUT -i lo -j ACCEPT
  19. iptables -A INPUT -j DROP
  20.  
  21. # ---
  22.  
  23. iptables -A FORWARD -j DROP
  24.  
  25. # ---
  26.  
  27. iptables -A OUTPUT -m state --state INVALID -j DROP
  28. iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT
  29.  
  30. iptables -A OUTPUT -p udp -d 127.0.0.1 --dport 9053 -j ACCEPT
  31. iptables -A OUTPUT -p tcp -d 127.0.0.1 --dport 9040 --syn -j ACCEPT
  32.  
  33. iptables -A OUTPUT -p tcp -m owner --uid-owner debian-tor -m state --state NEW --syn -j ACCEPT
  34. iptables -A OUTPUT -o lo -j ACCEPT
  35.  
  36. for special_addr in $SPECIAL_ADDRS; do
  37.   iptables -A OUTPUT -d $special_addr -j DROP
  38. done
  39.  
  40. iptables -A OUTPUT -j DROP
  41.  
  42. # ---
  43.  
  44. iptables -t nat -A OUTPUT -p udp --dport 53 -j DNAT --to-destination='127.0.0.1:9053'
  45. iptables -t nat -A OUTPUT -p tcp -d 10.192.0.0/10 --syn -j DNAT --to-destination='127.0.0.1:9040'
  46.  
  47. iptables -t nat -A OUTPUT -p tcp -m owner --uid-owner debian-tor --syn -j RETURN
  48. iptables -t nat -A OUTPUT -o lo -j RETURN
  49.  
  50. for special_addr in $SPECIAL_ADDRS; do
  51.   iptables -t nat -A OUTPUT -d $special_addr -j RETURN
  52. done
  53.  
  54. iptables -t nat -A OUTPUT -p tcp --syn -j DNAT --to-destination='127.0.0.1:9040'
  55.  
  56. # ---
  57.  
  58. ip6tables -P INPUT DROP; ip6tables -P FORWARD DROP; ip6tables -P OUTPUT DROP
  59. ip6tables -A INPUT -j DROP; ip6tables -A FORWARD -j DROP; ip6tables -A OUTPUT -j DROP
  60.  
  61. # ---
  62.  
  63. {
  64.   echo DNSPort 127.0.0.1:9053
  65.   echo AutomapHostsOnResolve 1
  66.   echo AutomapHostsSuffixes .onion
  67.   echo
  68.   echo TransPort 127.0.0.1:9040
  69.   echo VirtualAddrNetwork 10.192.0.0/10
  70. } > /etc/tor/torrc && systemctl restart tor
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