109 lines
3.5 KiB
Bash
109 lines
3.5 KiB
Bash
#
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### Set variables
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# The UID that Tor runs as (varies from system to system)
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#_tor_uid="109" #As per assumption
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_tor_uid=`id -u debian-tor` #Debian/Ubuntu
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#_tor_uid=`id -u tor` #ArchLinux/Gentoo
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# Tor's TransPort
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_trans_port="{{ tor_trans_port }}"
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# Tor's DNSPort
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_dns_port="{{ tor_dns_port }}"
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# Tor's VirtualAddrNetworkIPv4
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_virt_addr="10.192.0.0/10"
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# Your outgoing interface
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_out_if="{{ vm_net_interface_name }}"
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# LAN destinations that shouldn't be routed through Tor
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_non_tor="127.0.0.0/8 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16"
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# Other IANA reserved blocks (These are not processed by tor and dropped by default)
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_resv_iana="0.0.0.0/8 100.64.0.0/10 169.254.0.0/16 192.0.0.0/24 192.0.2.0/24 192.88.99.0/24 198.18.0.0/15 198.51.100.0/24 203.0.113.0/24 224.0.0.0/4 240.0.0.0/4 255.255.255.255/32"
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### Don't lock yourself out after the flush
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#iptables -P INPUT ACCEPT
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#iptables -P OUTPUT ACCEPT
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### Flush iptables
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iptables -F
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iptables -t nat -F
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### *nat OUTPUT (For local redirection)
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# nat .onion addresses
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iptables -t nat -A OUTPUT -d $_virt_addr -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j REDIRECT --to-ports $_trans_port
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# nat dns requests to Tor
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iptables -t nat -A OUTPUT -d 127.0.0.1/32 -p udp -m udp --dport 53 -j REDIRECT --to-ports $_dns_port
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# Don't nat the Tor process, the loopback, or the local network
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iptables -t nat -A OUTPUT -m owner --uid-owner $_tor_uid -j RETURN
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iptables -t nat -A OUTPUT -o lo -j RETURN
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# Allow lan access for hosts in $_non_tor
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for _lan in $_non_tor; do
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iptables -t nat -A OUTPUT -d $_lan -j RETURN
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done
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for _iana in $_resv_iana; do
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iptables -t nat -A OUTPUT -d $_iana -j RETURN
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done
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# Redirect all other pre-routing and output to Tor's TransPort
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iptables -t nat -A OUTPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j REDIRECT --to-ports $_trans_port
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### *filter INPUT
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# Don't forget to grant yourself ssh access from remote machines before the DROP.
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#iptables -A INPUT -i $_out_if -p tcp --dport 22 -m state --state NEW -j ACCEPT
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iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
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iptables -A INPUT -i lo -j ACCEPT
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# Allow INPUT from lan hosts in $_non_tor
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# Uncomment these 3 lines to enable.
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#for _lan in $_non_tor; do
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# iptables -A INPUT -s $_lan -j ACCEPT
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#done
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# Log & Drop everything else. Uncomment to enable logging
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#iptables -A INPUT -j LOG --log-prefix "Dropped INPUT packet: " --log-level 7 --log-uid
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iptables -A INPUT -j DROP
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### *filter FORWARD
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iptables -A FORWARD -j DROP
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### *filter OUTPUT
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iptables -A OUTPUT -m state --state INVALID -j DROP
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iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT
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# Allow Tor process output
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iptables -A OUTPUT -o $_out_if -m owner --uid-owner $_tor_uid -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j ACCEPT
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# Allow loopback output
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iptables -A OUTPUT -d 127.0.0.1/32 -o lo -j ACCEPT
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# Tor transproxy magic
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iptables -A OUTPUT -d 127.0.0.1/32 -p tcp -m tcp --dport $_trans_port --tcp-flags FIN,SYN,RST,ACK SYN -j ACCEPT
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# Allow OUTPUT to lan hosts in $_non_tor
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# Uncomment these 3 lines to enable.
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#for _lan in $_non_tor; do
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# iptables -A OUTPUT -d $_lan -j ACCEPT
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#done
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# Log & Drop everything else. Uncomment to enable logging
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#iptables -A OUTPUT -j LOG --log-prefix "Dropped OUTPUT packet: " --log-level 7 --log-uid
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iptables -A OUTPUT -j DROP
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### Set default policies to DROP
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iptables -P INPUT DROP
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iptables -P FORWARD DROP
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iptables -P OUTPUT DROP
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### Set default policies to DROP for IPv6
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#ip6tables -P INPUT DROP
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#ip6tables -P FORWARD DROP
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#ip6tables -P OUTPUT DROP
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