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ipfw: Add option for firewall_type to be a directory #1828

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ipfw: Add option for firewall_type to be a directory
thegushi Aug 28, 2025
46e2432
man: Document ipfw directory changes
thegushi Sep 11, 2025
44c6649
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thegushi Sep 29, 2025
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11 changes: 10 additions & 1 deletion libexec/rc/rc.firewall
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Original file line number Diff line number Diff line change
Expand Up @@ -547,7 +547,16 @@ case ${firewall_type} in
;;
*)
if [ -r "${firewall_type}" ]; then
${fwcmd} ${firewall_flags} ${firewall_type}
if [ -f "${firewall_type}" ]; then
${fwcmd} ${firewall_flags} ${firewall_type}
else
if [ -d "${firewall_type}" ]; then
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@markjdb markjdb Sep 5, 2025

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We need to update share/man/man5/rc.conf.5 to note that firewall_type can be a directory.

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@thegushi thegushi Sep 5, 2025

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That I can do -- this change came out of the way we had modded this file to meet our needs, and obviously, we didn't tweak the docs for our own use. Coming shortly.

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@thegushi thegushi Sep 11, 2025

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Done (modulo some fighting with github)

for fwfile in `rcorder $firewall_type/*`
do
ipfw -q $fwfile;
done
fi
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@markjdb markjdb Sep 5, 2025

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The indentation looks wonky here, or is that just github rendering it incorrectly somehow?

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@thegushi thegushi Sep 5, 2025

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I may have messed it up. The style in this file is odd -- things are indented with hard-tabs inside a function (but only sometimes?), but two-spaces inside a for loop? I had used a tab inside the for

Here's a screenshot in Nano with whitespace display turned on. (Also look at the function above this one)

image

But go look at the original file, it's just as weird and other than the "for" loop it's all hard tabs. This file is very inconsistent.

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@thegushi thegushi Sep 5, 2025

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For context, here's the original file. Also tabs inside an if-block.

image

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@markjdb markjdb Sep 8, 2025

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Ok, I think this is fine then.

fi
fi
;;
esac
13 changes: 13 additions & 0 deletions share/examples/ipfw.d/final
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@@ -0,0 +1,13 @@
#
# PROVIDE: final
# REQUIRE: setup services outbound routing
#

#
add allow tcp from me to any out setup // default outbound

# silently ignore local multicast
add deny ip from any to 224.0.0.0/4 // drop multicast

# drop and log everything else
add reset log ip from any to any
11 changes: 11 additions & 0 deletions share/examples/ipfw.d/ntp_client
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@@ -0,0 +1,11 @@
# REQUIRE: outbound
# PROVIDE: ntp_client ntp_servers
# BEFORE: final

table ntp_servers create

# Uncomment and your NTP servers (if they are on known ips in your network) to the following table:

# table ntp_servers add x.x.x.x

add allow ip from me to table(ntp_servers) 123 keep-state // NTP outbound
6 changes: 6 additions & 0 deletions share/examples/ipfw.d/outbound
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@@ -0,0 +1,6 @@
#
# REQUIRE: services
# PROVIDE: outbound
# BEFORE: final
#
# meta class - adds no rules
6 changes: 6 additions & 0 deletions share/examples/ipfw.d/routing
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@@ -0,0 +1,6 @@
#
# REQUIRE: setup
# PROVIDE: routing
# BEFORE: services
#
# meta class - adds no rules
5 changes: 5 additions & 0 deletions share/examples/ipfw.d/services
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@@ -0,0 +1,5 @@
# REQUIRE: setup routing
# PROVIDE: services
# BEFORE: outbound
#
# meta class - adds no rules
47 changes: 47 additions & 0 deletions share/examples/ipfw.d/setup
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@@ -0,0 +1,47 @@
#
# PROVIDE: setup blocked bogons
# BEFORE: services routing outbound final
#

# remove all existing tables
table all destroy
table blocked create

# standard (non-service specific) tables
table bogons create
table bogons add 0.0.0.0/8
table bogons add 10.0.0.0/8
table bogons add 172.12.0.0/12
table bogons add 192.168.0.0/16
table bogons add 169.254.0.0/16
table bogons add 240.0.0.0/4

# permit existing TCP sessions
add allow tcp from any to any established

# permit internal loopback traffic
add allow ip from any to any via lo0
add allow ip from any to any via lo1

# deny directed loopback traffic
add deny ip from any to 127.0.0.0/8 in
add deny ip from any to ::/64 in

# deny unexpected sources
add deny ip from table(bogons) to me in // unexpected sources

# deny explicitly disabled (non-persistent) sources
add deny ip from table(blocked) to me in // emergency (non-persistent) blocklist

# allow bsd-standard-port traceroutes
add allow udp from me to any 33434-33600 // traceroute in
add allow udp from any to me 33434-33600 // traceroute out
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@jlduran jlduran Oct 14, 2025

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I would prefer:

add unreach port udp from any to me dst-port 33434-33626

traceroute expects the host to return a destination port unreachable (ICMP type 3, code 3), by default starting on port $2^{15} + 666 = 33434$ and up to net.inet.ip.ttl (64 by default) hops, each with 3 probes by default ($33434 + 64 \times 3 = 33626$).


# moderately permissive ICMPv4
add allow icmp from any to any icmptypes 0,3,8,11,13,14 // safe ICMPv4

# link-local ICMPv6 (RS, RA, NS, NA) - per FreeBSD standard rules
add allow ipv6-icmp from :: to fe80::/10 // ICMPv6 DAD
add allow ipv6-icmp from fe80::/10 to fe80::/10 // ICMPv6 NDP
add allow ipv6-icmp from fe80::/10 to ff02::/16 // ICMPv6 NDP
add allow ipv6-icmp from any to any icmp6types 1,2,3,128,129,135,136 // safe ICMPv6
7 changes: 7 additions & 0 deletions share/examples/ipfw.d/ssh_service
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@@ -0,0 +1,7 @@
# REQUIRE: services
# PROVIDE: ssh_service ssh_clients
# BEFORE: outbound

table ssh_clients create

add allow tcp from table(ssh_clients) to me 22 in setup // inbound SSH
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