https://chng.it/jJvMChbdsJ
вс, 26 дек. 2021 г., 02:13 linux_forum1 <[email protected]>: > Hello, I'm trying to make the most specific, secure and restrictive > iptables possible for a simple VPN connection on Debian. Could you have a > quick look if those are OK? Thanks so much! > > VPN Server Port:1194 > > VPN Server IP: 189.174.135.110 > > -P INPUT DROP > -P FORWARD DROP > -P OUTPUT DROP > > #no fragmented packets > -A INPUT -f -j DROP > #localhost > -A INPUT -s 127.0.0.0/8 ! -i lo -j DROP > -A INPUT -i lo -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT > -A OUTPUT -o lo -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT > # first packet has to be TCP syn > -A INPUT -p tcp ! --syn -m state --state NEW -j DROP > #drop sop icmp > -A INPUT -p icmp --icmp-type address-mask-request -j DROP > -A INPUT -p icmp --icmp-type timestamp-request -j DROP > #Ping from inside to outside > -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT > -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT > #drop broadcast, multicast anycast > -A INPUT -m addrtype --dst-type BROADCAST -j DROP > -A INPUT -m addrtype --dst-type MULTICAST -j DROP > -A INPUT -m addrtype --dst-type ANYCAST -j DROP > -A INPUT -d 224.0.0.0/4 -j DROP > #drop invalid > -A INPUT -m state --state INVALID -j DROP > #drop spoofed packets > -A INPUT -s 0.0.0.0/8 -j DROP > -A INPUT -d 0.0.0.0/8 -j DROP > -A INPUT -d 239.255.255.0/24 -j DROP > -A INPUT -d 255.255.255.255 -j DROP > # DROP RFC1918 PACKETS > -A INPUT -s 10.0.0.0/8 -j DROP > -A INPUT -s 172.16.0.0/12 -j DROP > -A INPUT -s 192.168.0.0/16 -j DROP > #Allow VPN > > - A INPUT -i eth0 -p udp -m udp -s 189.174.135.110 -d 192.168.1.0/24 --sport > 1194 --dport 32768:65535 -m conntrack --ctstate ESTABLISHED -j ACCEPT > -A OUTPUT -o eth0 -p udp -m udp -s 192.168.1.0/24 -d 189.174.135.110 --dport > 1194 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT > > > > > >
