40 lines
1.1 KiB
Bash
40 lines
1.1 KiB
Bash
#!/bin/sh
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# check iptables rule specification is exist,
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# if not add it
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check_and_add_iptables()
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{
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iptables -C "$@" > /dev/null 2>&1
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EXIST=$?
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if [ $EXIST -ne 0 ]; then
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iptables -A "$@"
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fi
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}
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add_input_tcp_filter() {
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check_and_add_iptables INPUT -p tcp -m tcp --dport "$1" -m comment --comment "$2" -j ACCEPT
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}
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# allow basic services
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add_input_tcp_filter 22 SSH
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add_input_tcp_filter 2263 SSH
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add_input_tcp_filter 80 HTTP
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add_input_tcp_filter 443 HTTPS
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# allow DNS
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check_and_add_iptables INPUT -p tcp --dport 53 -j ACCEPT -m comment --comment "DNS"
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check_and_add_iptables INPUT -p udp --dport 53 -j ACCEPT -m comment --comment "DNS"
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# allow internal network
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check_and_add_iptables INPUT -s 127.0.0.0/24 -m comment --comment "Internal Network" -j ACCEPT
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# allow ping
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check_and_add_iptables INPUT -p icmp -m comment --comment ping -j ACCEPT
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# allow all established and related connections
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check_and_add_iptables INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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# allow loopback
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check_and_add_iptables INPUT -i lo -j ACCEPT
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# dropped for INPUT by default
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iptables -P INPUT DROP
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add_input_tcp_filter 9443 gost-proxy
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