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author | julian <julian@FreeBSD.org> | 2015-08-24 03:51:18 +0000 |
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committer | julian <julian@FreeBSD.org> | 2015-08-24 03:51:18 +0000 |
commit | 566fb848ec489a3d9d6df78b18ace62a8e08841e (patch) | |
tree | 34dd4a01f37a20cc9baa9767f045ccfaa2036d06 | |
parent | 370bb5e04c4f0e883d0d9bc3eead98c4afe8d7b0 (diff) | |
download | FreeBSD-src-566fb848ec489a3d9d6df78b18ace62a8e08841e.zip FreeBSD-src-566fb848ec489a3d9d6df78b18ace62a8e08841e.tar.gz |
MFH: r284691
MFH: r284920
Remove 16 rules and replace by 2 by using a table.
I've been doing this ever since there were tables.
I could make more efficient by using "in recv" and "out xmit" instead of via
but I'll leave that.
-rw-r--r-- | etc/rc.firewall | 38 |
1 files changed, 15 insertions, 23 deletions
diff --git a/etc/rc.firewall b/etc/rc.firewall index ee578ef..c936da6 100644 --- a/etc/rc.firewall +++ b/etc/rc.firewall @@ -266,6 +266,7 @@ case ${firewall_type} in # firewall_simple_oif_ipv6: Outside IPv6 network interface. # firewall_simple_onet_ipv6: Outside IPv6 network prefix. ############ + BAD_ADDR_TBL=13 # set these to your outside interface network oif="$firewall_simple_oif" @@ -290,19 +291,23 @@ case ${firewall_type} in fi fi + # Define stuff we should never send out or receive in. # Stop RFC1918 nets on the outside interface - ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif} - ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif} - ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif} + ${fwcmd} table ${BAD_ADDR_TBL} flush + ${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8 + ${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12 + ${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16 - # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, + # And stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) # on the outside interface - ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif} - ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif} - ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif} - ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif} - ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif} + ${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8 + ${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16 + ${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24 + ${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4 + ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4 + + ${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif} # Network Address Translation. This rule is placed here deliberately # so that it does not interfere with the surrounding address-checking @@ -319,20 +324,7 @@ case ${firewall_type} in ;; esac - # Stop RFC1918 nets on the outside interface - ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif} - ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif} - ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif} - - # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, - # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) - # on the outside interface - ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif} - ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif} - ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif} - ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif} - ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif} - + ${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif} if [ -n "$inet6" ]; then # Stop unique local unicast address on the outside interface ${fwcmd} add deny all from fc00::/7 to any via ${oif6} |