141 lines
5.2 KiB
Bash
Executable File
141 lines
5.2 KiB
Bash
Executable File
#!/bin/sh
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# https://www.freebsd.org/doc/handbook/firewalls-ipfw.html
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# ipfw -vated list
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# IPFW configuration
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#sysrc firewall_enable="YES"
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#sysrc firewall_logif="YES"
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#sysrc firewall_script="/mnt/config/ipfw.rules"
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# NATd configuration
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#sysrc gateway_enable="YES"
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#sysrc natd_enable="YES"
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#sysrc natd_interface="epair0b"
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#sysrc natd_flags="-f /mnt/config/natd.conf"
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#natd.conf:
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#redirect_port tcp 172.16.0.100:21-23 21-23
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# Set rules command prefix
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cmd="ipfw -q add"
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lif="tun186" # interface name of tunnel attached to Local network
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rif="epair0b" # interface name of vnet attached to Remote/external network
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skip="skipto 12000"
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# Flush out the list before we begin.
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ipfw -q -f flush
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# gateway_enable already set in rc.conf
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# sysctl net.inet.ip.forwarding=1
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# Packets passing the stateful NAT may be re-injected into the firewall
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# sysctl net.inet.ip.fw.one_pass=0
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ipfw disable one_pass
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# functionality is included in the divert action
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#ipfw -q nat 1 config if $rif same_ports unreg_only reset
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$cmd 00050 allow ip from any to any via $lif
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$cmd 00100 allow ip from any to any via lo0
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$cmd 00200 deny ip from any to 127.0.0.0/8
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$cmd 00300 deny ip from 127.0.0.0/8 to any
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$cmd 00400 deny ip from any to ::1
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$cmd 00500 deny ip from ::1 to any
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$cmd 00600 allow ipv6-icmp from :: to ff02::/16
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$cmd 00700 allow ipv6-icmp from fe80::/10 to fe80::/10
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$cmd 00800 allow ipv6-icmp from fe80::/10 to ff02::/16
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$cmd 00900 allow ipv6-icmp from any to any icmp6types 1
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$cmd 01000 allow ipv6-icmp from any to any icmp6types 2,135,136
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# The reassemble rule is not needed with userland natd(8)
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# because the internal workings of the IPFW divert action
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# takes care of reassembling packets before delivery to the socket
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#$cmd 01100 reass all from any to any in
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$cmd 01200 divert natd ip from any to any in via $rif # NAT any inbound packets
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# Allow the packet through if it has an existing entry in the dynamic rules table
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$cmd 01300 check-state
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# Allow access to DNS
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$cmd 02110 $skip tcp from any to 192.168.0.5 53 out via $rif setup keep-state
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$cmd 02111 $skip udp from any to 192.168.0.5 53 out via $rif keep-state
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$cmd 02112 $skip tcp from any to 2603:3024:3f6:e1::5 53 out via $rif setup keep-state
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$cmd 02113 $skip udp from any to 2603:3024:3f6:e1::5 53 out via $rif keep-state
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# Allow access to ISP's DHCP server for cable/DSL configurations.
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# Use the first rule and check log for IP address.
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# Then, uncomment the second rule, input the IP address, and delete the first rule
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#$cmd 02120 $skip log udp from any to any 67 out via $rif keep-state
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#$cmd 02120 $skip udp from any to x.x.x.x 67 out via $rif keep-state
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# Allow outbound ping
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$cmd 02210 $skip icmp from any to any out via $rif keep-state
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# Allow outbound NTP
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$cmd 02220 $skip udp from any to any 123 out via $rif keep-state
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# Allow outbound TCP traffic
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$cmd 02500 $skip tcp from any to any 20,22,25,80,443 out via $rif setup keep-state
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# 03720 pasv ftp
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# deny and log all other outbound connections
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$cmd 02999 deny log all from any to any out via $rif
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#### Lockdown incoming traffic
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# Deny all inbound traffic from non-routable reserved address spaces
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#$cmd 03110 deny all from 192.168.0.0/16 to any in via $rif #RFC 1918 private IP
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#$cmd 03111 deny all from 172.16.0.0/12 to any in via $rif #RFC 1918 private IP
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#$cmd 03112 deny all from 10.0.0.0/8 to any in via $rif #RFC 1918 private IP
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$cmd 03113 deny all from 127.0.0.0/8 to any in via $rif #loopback
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$cmd 03114 deny all from 0.0.0.0/8 to any in via $rif #loopback
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$cmd 03115 deny all from 169.254.0.0/16 to any in via $rif #DHCP auto-config
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$cmd 03116 deny all from 192.0.2.0/24 to any in via $rif #reserved for docs
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$cmd 03117 deny all from 204.152.64.0/23 to any in via $rif #Sun cluster interconnect
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$cmd 03118 deny all from 224.0.0.0/3 to any in via $rif #Class D & E multicast
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# Allow traffic from ISP's DHCP server.
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# Replace x.x.x.x with the same IP address used in rule 02120.
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#$cmd 03120 allow udp from any to x.x.x.x 67 in via $rif keep-state
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# Allow public pings
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$cmd 03210 allow icmp from any to any in via $rif
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# Deny ident
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$cmd 03230 deny tcp from any to any 113 in via $rif
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# Deny all Netbios services.
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$cmd 03240 deny { tcp or udp } from any to any 81,137-139,445,1026,1027,1433,1434 in via $rif
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# Deny fragments
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$cmd 03250 deny all from any to any frag in via $rif
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# Deny ACK packets that did not match the dynamic rule table
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$cmd 03500 deny tcp from any to any established in via $rif
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# Allow inbound SSH host connections
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$cmd 03610 allow tcp from any to me 22 in via $rif setup limit src-addr 2
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# Allow HTTP host connections to host web server
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$cmd 03620 allow tcp from any to me 80 in via $rif setup limit src-addr 2
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# Allow inbound Telnet connections to NAT
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$cmd 03710 allow tcp from any to me 23,3270 in via $rif setup limit src-addr 2
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# Allow inbound FTP connections to NAT
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$cmd 03720 allow tcp from any to me 20,21 in via $rif setup limit src-addr 2
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# 02500 pasv ftp
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# Reject and log all other incoming connections
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$cmd 03999 deny log all from any to any in via $rif
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#### lockdown in
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$cmd 12000 divert natd ip from any to any out via $rif # skipto location for outbound stateful rules
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$cmd 65000 allow ip from any to any
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#$cmd 65535 deny ip from any to any
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