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firewall: allow local redirection of ports

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Allow a redirect like:

config redirect
        option src 'wan'
        option dest 'lan'
        option src_dport '22001'
        option dest_port '22'
        option proto 'tcp'

note the absence of the "dest_ip" field, meaning to terminate the connection on the firewall itself.

This patch makes three changes:

(1) moves the conntrack module into the conntrack package (but not any of the conntrack_* helpers).
(2) fixes a bug where the wrong table is used when the "dest_ip" field is absent.
(3) accepts incoming connections on the destination port on the input_ZONE table, but only for DNATted
    connections.

In the above example,

ssh -p 22 root@myrouter

would fail from the outside, but:

ssh -p 22001 root@myrouter

would succeed.  This is handy if:

(1) you want to avoid ssh probes on your router, or
(2) you want to redirect incoming connections on port 22 to some machine inside your firewall, but
    still want to allow firewall access from outside.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26617 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
jow 2011-04-12 20:03:59 +00:00
parent ac6a544e6c
commit 0874d00715
2 changed files with 4 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/netfilter.mk
View File

@ -60,6 +60,8 @@ $(eval $(call nf_add,IPT_CONNTRACK,CONFIG_NETFILTER_XT_MATCH_STATE, $(P_XT)xt_st
$(eval $(call nf_add,IPT_CONNTRACK,CONFIG_IP_NF_RAW, $(P_V4)iptable_raw))
$(eval $(call nf_add,IPT_CONNTRACK,CONFIG_IP_NF_TARGET_NOTRACK, $(P_V4)ipt_NOTRACK))
$(eval $(call nf_add,IPT_CONNTRACK,CONFIG_NETFILTER_XT_TARGET_NOTRACK, $(P_XT)xt_NOTRACK))
$(eval $(call nf_add,IPT_CONNTRACK,CONFIG_IP_NF_MATCH_CONNTRACK, $(P_V4)ipt_conntrack))
$(eval $(call nf_add,IPT_CONNTRACK,CONFIG_NETFILTER_XT_MATCH_CONNTRACK, $(P_XT)xt_conntrack))
# conntrack-extra
@ -68,8 +70,6 @@ $(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_IP_NF_MATCH_CONNBYTES, $(P_V4)ip
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_NETFILTER_XT_MATCH_CONNBYTES, $(P_XT)xt_connbytes))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_IP_NF_MATCH_CONNMARK, $(P_V4)ipt_connmark))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_NETFILTER_XT_MATCH_CONNMARK, $(P_XT)xt_connmark))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_IP_NF_MATCH_CONNTRACK, $(P_V4)ipt_conntrack))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_NETFILTER_XT_MATCH_CONNTRACK, $(P_XT)xt_conntrack))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_IP_NF_MATCH_HELPER, $(P_V4)ipt_helper))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_NETFILTER_XT_MATCH_HELPER, $(P_XT)xt_helper))
$(eval $(call nf_add,IPT_CONNTRACK_EXTRA,CONFIG_IP_NF_MATCH_RECENT, $(P_V4)ipt_recent))

5
package/firewall/files/lib/core_redirect.sh
View File

@ -34,7 +34,7 @@ fw_load_redirect() {
return 0
}
fwdchain="zone_${redirect_src}_forward"
fwdchain="zone_${redirect_src}${redirect_dest_ip:+_forward}"
natopt="--to-destination"
natchain="zone_${redirect_src}_prerouting"
@ -100,9 +100,8 @@ fw_load_redirect() {
$natopt $nataddr${natports:+:$natports} \
}
[ -n "$destaddr" ] && \
fw add $mode f ${fwdchain:-forward} ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
$srcaddr $destaddr \
$srcaddr ${destaddr:--m conntrack --ctstate DNAT} \
${redirect_proto:+-p $redirect_proto} \
${srcports:+--sport $srcports} \
${destports:+--dport $destports} \