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############### start of example ipfw rules script ############# # ipfw -q -f flush # Delete all rules # Set defaults oif="tun0" # out interface odns="192.0.2.11" # ISP's DNS server IP address cmd="ipfw -q add " # build rule prefix ks="keep-state" # just too lazy to key this each time $cmd 00500 check-state $cmd 00502 deny all from any to any frag $cmd 00501 deny tcp from any to any established $cmd 00600 allow tcp from any to any 80 out via $oif setup $ks $cmd 00610 allow tcp from any to $odns 53 out via $oif setup $ks $cmd 00611 allow udp from any to $odns 53 out via $oif $ks ################### End of example ipfw rules script ############
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################ Start of IPFW rules file ############################### # Flush out the list before we begin. ipfw -q -f flush # Set rules command prefix cmd="ipfw -q add" pif="dc0" # public interface name of NIC # facing the public Internet ################################################################# # No restrictions on Inside LAN Interface for private network # Not needed unless you have LAN. # Change xl0 to your LAN NIC interface name ################################################################# #$cmd 00005 allow all from any to any via xl0 ################################################################# # No restrictions on Loopback Interface ################################################################# $cmd 00010 allow all from any to any via lo0 ################################################################# # Allow the packet through if it has previous been added to the # the "dynamic" rules table by a allow keep-state statement. ################################################################# $cmd 00015 check-state ################################################################# # Interface facing Public Internet (Outbound Section) # Interrogate session start requests originating from behind the # firewall on the private network or from this gateway server # destined for the public Internet. ################################################################# # Allow out access to my ISP's Domain name server. # x.x.x.x must be the IP address of your ISP.s DNS # Dup these lines if your ISP has more than one DNS server # Get the IP addresses from /etc/resolv.conf file $cmd 00110 allow tcp from any to x.x.x.x 53 out via $pif setup keep-state $cmd 00111 allow udp from any to x.x.x.x 53 out via $pif keep-state # Allow out access to my ISP's DHCP server for cable/DSL configurations. # This rule is not needed for .user ppp. connection to the public Internet. # so you can delete this whole group. # Use the following rule and check log for IP address. # Then put IP address in commented out rule & delete first rule $cmd 00120 allow log udp from any to any 67 out via $pif keep-state #$cmd 00120 allow udp from any to x.x.x.x 67 out via $pif keep-state # Allow out non-secure standard www function $cmd 00200 allow tcp from any to any 80 out via $pif setup keep-state # Allow out secure www function https over TLS SSL $cmd 00220 allow tcp from any to any 443 out via $pif setup keep-state # Allow out send & get email function $cmd 00230 allow tcp from any to any 25 out via $pif setup keep-state $cmd 00231 allow tcp from any to any 110 out via $pif setup keep-state # Allow out FBSD (make install & CVSUP) functions # Basically give user root "GOD" privileges. $cmd 00240 allow tcp from me to any out via $pif setup keep-state uid root # Allow out ping $cmd 00250 allow icmp from any to any out via $pif keep-state # Allow out Time $cmd 00260 allow tcp from any to any 37 out via $pif setup keep-state # Allow out nntp news (i.e., news groups) $cmd 00270 allow tcp from any to any 119 out via $pif setup keep-state # Allow out secure FTP, Telnet, and SCP # This function is using SSH (secure shell) $cmd 00280 allow tcp from any to any 22 out via $pif setup keep-state # Allow out whois $cmd 00290 allow tcp from any to any 43 out via $pif setup keep-state # deny and log everything else that.s trying to get out. # This rule enforces the block all by default logic. $cmd 00299 deny log all from any to any out via $pif ################################################################# # Interface facing Public Internet (Inbound Section) # Check packets originating from the public Internet # destined for this gateway server or the private network. ################################################################# # Deny all inbound traffic from non-routable reserved address spaces $cmd 00300 deny all from 192.168.0.0/16 to any in via $pif #RFC 1918 private IP $cmd 00301 deny all from 172.16.0.0/12 to any in via $pif #RFC 1918 private IP $cmd 00302 deny all from 10.0.0.0/8 to any in via $pif #RFC 1918 private IP $cmd 00303 deny all from 127.0.0.0/8 to any in via $pif #loopback $cmd 00304 deny all from 0.0.0.0/8 to any in via $pif #loopback $cmd 00305 deny all from 169.254.0.0/16 to any in via $pif #DHCP auto-config $cmd 00306 deny all from 192.0.2.0/24 to any in via $pif #reserved for docs $cmd 00307 deny all from 204.152.64.0/23 to any in via $pif #Sun cluster interconnect $cmd 00308 deny all from 224.0.0.0/3 to any in via $pif #Class D & E multicast # Deny public pings $cmd 00310 deny icmp from any to any in via $pif # Deny ident $cmd 00315 deny tcp from any to any 113 in via $pif # Deny all Netbios service. 137=name, 138=datagram, 139=session # Netbios is MS/Windows sharing services. # Block MS/Windows hosts2 name server requests 81 $cmd 00320 deny tcp from any to any 137 in via $pif $cmd 00321 deny tcp from any to any 138 in via $pif $cmd 00322 deny tcp from any to any 139 in via $pif $cmd 00323 deny tcp from any to any 81 in via $pif # Deny any late arriving packets $cmd 00330 deny all from any to any frag in via $pif # Deny ACK packets that did not match the dynamic rule table $cmd 00332 deny tcp from any to any established in via $pif # Allow traffic in from ISP's DHCP server. This rule must contain # the IP address of your ISP.s DHCP server as it.s the only # authorized source to send this packet type. # Only necessary for cable or DSL configurations. # This rule is not needed for .user ppp. type connection to # the public Internet. This is the same IP address you captured # and used in the outbound section. #$cmd 00360 allow udp from any to x.x.x.x 67 in via $pif keep-state # Allow in standard www function because I have apache server $cmd 00400 allow tcp from any to me 80 in via $pif setup limit src-addr 2 # Allow in secure FTP, Telnet, and SCP from public Internet $cmd 00410 allow tcp from any to me 22 in via $pif setup limit src-addr 2 # Allow in non-secure Telnet session from public Internet # labeled non-secure because ID & PW are passed over public # Internet as clear text. # Delete this sample group if you do not have telnet server enabled. $cmd 00420 allow tcp from any to me 23 in via $pif setup limit src-addr 2 # Reject & Log all incoming connections from the outside $cmd 00499 deny log all from any to any in via $pif # Everything else is denied by default # deny and log all packets that fell through to see what they are $cmd 00999 deny log all from any to any ################ End of IPFW rules file ###############################
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#!/bin/sh cmd="ipfw -q add" skip="skipto 500" pif=rl0 ks="keep-state" good_tcpo="22,25,37,43,53,80,443,110,119" ipfw -q -f flush $cmd 002 allow all from any to any via xl0 # exclude LAN traffic $cmd 003 allow all from any to any via lo0 # exclude loopback traffic $cmd 100 divert natd ip from any to any in via $pif $cmd 101 check-state # Authorized outbound packets $cmd 120 $skip udp from any to xx.168.240.2 53 out via $pif $ks $cmd 121 $skip udp from any to xx.168.240.5 53 out via $pif $ks $cmd 125 $skip tcp from any to any $good_tcpo out via $pif setup $ks $cmd 130 $skip icmp from any to any out via $pif $ks $cmd 135 $skip udp from any to any 123 out via $pif $ks # Deny all inbound traffic from non-routable reserved address spaces $cmd 300 deny all from 192.168.0.0/16 to any in via $pif #RFC 1918 private IP $cmd 301 deny all from 172.16.0.0/12 to any in via $pif #RFC 1918 private IP $cmd 302 deny all from 10.0.0.0/8 to any in via $pif #RFC 1918 private IP $cmd 303 deny all from 127.0.0.0/8 to any in via $pif #loopback $cmd 304 deny all from 0.0.0.0/8 to any in via $pif #loopback $cmd 305 deny all from 169.254.0.0/16 to any in via $pif #DHCP auto-config $cmd 306 deny all from 192.0.2.0/24 to any in via $pif #reserved for docs $cmd 307 deny all from 204.152.64.0/23 to any in via $pif #Sun cluster $cmd 308 deny all from 224.0.0.0/3 to any in via $pif #Class D & E multicast # Authorized inbound packets $cmd 400 allow udp from xx.70.207.54 to any 68 in $ks $cmd 420 allow tcp from any to me 80 in via $pif setup limit src-addr 1 $cmd 450 deny log ip from any to any # This is skipto location for outbound stateful rules $cmd 500 divert natd ip from any to any out via $pif $cmd 510 allow ip from any to any ######################## end of rules ##################
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#!/bin/sh ################ Start of IPFW rules file ############################### # Flush out the list before we begin. ipfw -q -f flush # Set rules command prefix cmd="ipfw -q add" skip="skipto 800" pif="rl0" # public interface name of NIC # facing the public Internet ################################################################# # No restrictions on Inside LAN Interface for private network # Change xl0 to your LAN NIC interface name ################################################################# $cmd 005 allow all from any to any via xl0 ################################################################# # No restrictions on Loopback Interface ################################################################# $cmd 010 allow all from any to any via lo0 ################################################################# # check if packet is inbound and nat address if it is ################################################################# $cmd 014 divert natd ip from any to any in via $pif ################################################################# # Allow the packet through if it has previous been added to the # the "dynamic" rules table by a allow keep-state statement. ################################################################# $cmd 015 check-state ################################################################# # Interface facing Public Internet (Outbound Section) # Check session start requests originating from behind the # firewall on the private network or from this gateway server # destined for the public Internet. ################################################################# # Allow out access to my ISP's Domain name server. # x.x.x.x must be the IP address of your ISP's DNS # Dup these lines if your ISP has more than one DNS server # Get the IP addresses from /etc/resolv.conf file $cmd 020 $skip tcp from any to x.x.x.x 53 out via $pif setup keep-state # Allow out access to my ISP's DHCP server for cable/DSL configurations. $cmd 030 $skip udp from any to x.x.x.x 67 out via $pif keep-state # Allow out non-secure standard www function $cmd 040 $skip tcp from any to any 80 out via $pif setup keep-state # Allow out secure www function https over TLS SSL $cmd 050 $skip tcp from any to any 443 out via $pif setup keep-state # Allow out send & get email function $cmd 060 $skip tcp from any to any 25 out via $pif setup keep-state $cmd 061 $skip tcp from any to any 110 out via $pif setup keep-state # Allow out FreeBSD (make install & CVSUP) functions # Basically give user root "GOD" privileges. $cmd 070 $skip tcp from me to any out via $pif setup keep-state uid root # Allow out ping $cmd 080 $skip icmp from any to any out via $pif keep-state # Allow out Time $cmd 090 $skip tcp from any to any 37 out via $pif setup keep-state # Allow out nntp news (i.e., news groups) $cmd 100 $skip tcp from any to any 119 out via $pif setup keep-state # Allow out secure FTP, Telnet, and SCP # This function is using SSH (secure shell) $cmd 110 $skip tcp from any to any 22 out via $pif setup keep-state # Allow out whois $cmd 120 $skip tcp from any to any 43 out via $pif setup keep-state # Allow ntp time server $cmd 130 $skip udp from any to any 123 out via $pif keep-state ################################################################# # Interface facing Public Internet (Inbound Section) # Check packets originating from the public Internet # destined for this gateway server or the private network. ################################################################# # Deny all inbound traffic from non-routable reserved address spaces $cmd 300 deny all from 192.168.0.0/16 to any in via $pif #RFC 1918 private IP $cmd 301 deny all from 172.16.0.0/12 to any in via $pif #RFC 1918 private IP $cmd 302 deny all from 10.0.0.0/8 to any in via $pif #RFC 1918 private IP $cmd 303 deny all from 127.0.0.0/8 to any in via $pif #loopback $cmd 304 deny all from 0.0.0.0/8 to any in via $pif #loopback $cmd 305 deny all from 169.254.0.0/16 to any in via $pif #DHCP auto-config $cmd 306 deny all from 192.0.2.0/24 to any in via $pif #reserved for docs $cmd 307 deny all from 204.152.64.0/23 to any in via $pif #Sun cluster $cmd 308 deny all from 224.0.0.0/3 to any in via $pif #Class D & E multicast # Deny ident $cmd 315 deny tcp from any to any 113 in via $pif # Deny all Netbios service. 137=name, 138=datagram, 139=session # Netbios is MS/Windows sharing services. # Block MS/Windows hosts2 name server requests 81 $cmd 320 deny tcp from any to any 137 in via $pif $cmd 321 deny tcp from any to any 138 in via $pif $cmd 322 deny tcp from any to any 139 in via $pif $cmd 323 deny tcp from any to any 81 in via $pif # Deny any late arriving packets $cmd 330 deny all from any to any frag in via $pif # Deny ACK packets that did not match the dynamic rule table $cmd 332 deny tcp from any to any established in via $pif # Allow traffic in from ISP's DHCP server. This rule must contain # the IP address of your ISP's DHCP server as it's the only # authorized source to send this packet type. # Only necessary for cable or DSL configurations. # This rule is not needed for 'user ppp' type connection to # the public Internet. This is the same IP address you captured # and used in the outbound section. $cmd 360 allow udp from x.x.x.x to any 68 in via $pif keep-state # Allow in standard www function because I have Apache server $cmd 370 allow tcp from any to me 80 in via $pif setup limit src-addr 2 # Allow in secure FTP, Telnet, and SCP from public Internet $cmd 380 allow tcp from any to me 22 in via $pif setup limit src-addr 2 # Allow in non-secure Telnet session from public Internet # labeled non-secure because ID & PW are passed over public # Internet as clear text. # Delete this sample group if you do not have telnet server enabled. $cmd 390 allow tcp from any to me 23 in via $pif setup limit src-addr 2 # Reject & Log all unauthorized incoming connections from the public Internet $cmd 400 deny log all from any to any in via $pif # Reject & Log all unauthorized out going connections to the public Internet $cmd 450 deny log all from any to any out via $pif # This is skipto location for outbound stateful rules $cmd 800 divert natd ip from any to any out via $pif $cmd 801 allow ip from any to any # Everything else is denied by default # deny and log all packets that fell through to see what they are $cmd 999 deny log all from any to any ################ End of IPFW rules file ###############################
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