ca5a2552a5
- Replace broken ipf* script - RCng script PR: ports/81615 Submitted by: Lupe Christoph <lupe@lupe-christoph.de> (maintainer)
68 lines
2.3 KiB
Bash
68 lines
2.3 KiB
Bash
#!/bin/sh
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#
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# *********************************************************************
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# This script is used with IPFilter if the ruleset (/etc/ipf.rules)
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# contains an explicit drop rule that masks a rule added at the end.
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# It expects block rules for both input and output filters. This
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# works e.g. with rule sets generated by fwbuilder.
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#
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# The script will insert it's rule before the drop rule. The drop rules
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# are expected to look like the $inblock and $outblock variables
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# defined below.
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#
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# Note that it does not use locking, so concurrent accesses may
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# interfere with each other.
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# *********************************************************************
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#
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# file "ipf_add.before_block"
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# IPFilter add script, called by "doormand".
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# This add two "pass in quick" rules to the firewall.
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#
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# Called with five arguments:
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#
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# $1 : name of the interface (e.g. ne0)
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# $2 : source IP; i.e. dotted-decimal address of the 'knock' client
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# $3 : source port; when this script is called for the first time
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# for a connection (man 8 doormand), this argument will be set
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# to a single "0" (0x30) character. This means that the source
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# port is not yet known, and a broad rule allowing any source
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# port is required.
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# $4 : destination IP; that is, the IP address of the interface
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# in argument 1.
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# $5 : The port number of the requested service (e.g. 22 for ssh, etc.)
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#
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# This script expects the IPFilter ruleset to have two rules like this:
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inblock="block in log quick on $1 from any to any"
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outblock="block out log quick on $1 from any to any"
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# The new rules will be inserted just before these blocking rules.
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if [ $3 = 0 ]; then
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inrule="pass in quick on $1 proto TCP from $2 to $4 port = $5"
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outrule="pass out quick on $1 proto TCP from $4 port = $5 to $2"
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else
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inrule="pass in quick on $1 proto TCP from $2 port = $3 to $4 port = $5"
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outrule="pass out quick on $1 proto TCP from $4 port = $5 to $2 port = $3"
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fi
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#
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# acquire lock (not implemented)
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#
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# Find the rule numbers of the block rules.
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inruleno=`ipfstat -in | sed -n -e "s/@\([0-9]*\) $inblock/\1/p"`
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outruleno=`ipfstat -on | sed -n -e "s/@\([0-9]*\) $outblock/\1/p"`
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# Insert new rules.
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ret=`(echo @$inruleno $inrule; echo @$outruleno $outrule) | /sbin/ipf -f - 2>&1`
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#
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# release lock (not implemented)
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#
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if [ -z "$ret" ]; then
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echo 0
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else
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echo -1 3 $ret
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fi
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