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