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- Log ----------------------------------------------------------------- commit 1b34f6cd64a7344220e69822175b26849caaa823 Author: Michael Tremer michael.tremer@ipfire.org Date: Thu Jan 22 16:06:25 2015 +0100

firewall: Fix SNAT rules that use a default network as source

In the POSTROUTING chain using -i intf0 does not work at all. We now only use the -s parameter to figure out if the rule applied. The filter chain still uses -i and -o to match patches not only by the network address, but also by the incoming/outgoing interface.

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Summary of changes: config/firewall/rules.pl | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)

Difference in files: diff --git a/config/firewall/rules.pl b/config/firewall/rules.pl index a475e2d..97b8897 100755 --- a/config/firewall/rules.pl +++ b/config/firewall/rules.pl @@ -368,20 +368,12 @@ sub buildrules { push(@source_options, ("-s", $source)); }

- if ($source_intf) { - push(@source_options, ("-i", $source_intf)); - } - # Prepare destination options. my @destination_options = (); if ($destination) { push(@destination_options, ("-d", $destination)); }

- if ($destination_intf) { - push(@destination_options, ("-o", $destination_intf)); - } - # Add time constraint options. push(@options, @time_options);

@@ -476,6 +468,17 @@ sub buildrules { } }

+ # Add source and destination interface to the filter rules. + # These are supposed to help filtering forged packets that originate + # from BLUE with an IP address from GREEN for instance. + if ($source_intf) { + push(@source_options, ("-i", $source_intf)); + } + + if ($destination_intf) { + push(@destination_options, ("-o", $destination_intf)); + } + push(@options, @source_options); push(@options, @destination_options);

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