Match multiple strings in iptables
I have 2 strings, and i wish to queue the packet if it contains both the strings ( something like ("jsh"&&"gjhyg")), i tried following ways, but they don't seem to work:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm -m string --string "def" --algo bm
This doesn't work, it only works if the packet contains the string "abcdef", but the packet i wish to queue contains the strings at two different locations. Then I tried another method:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
But this time it works like "or", it queues packets with string "abc" or "def".
linux networking ubuntu iptables
edited Sep 10 '14 at 14:00
Kenster
4,93022034
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
add a comment |
I have 2 strings, and i wish to queue the packet if it contains both the strings ( something like ("jsh"&&"gjhyg")), i tried following ways, but they don't seem to work:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm -m string --string "def" --algo bm
This doesn't work, it only works if the packet contains the string "abcdef", but the packet i wish to queue contains the strings at two different locations. Then I tried another method:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
But this time it works like "or", it queues packets with string "abc" or "def".
linux networking ubuntu iptables
edited Sep 10 '14 at 14:00
Kenster
4,93022034
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
I would have expected the first solution to work, since multiple-mare normally combined with anAND... and I can't find any reference of using regexp in the pattern. I'd say you just can't do it :/
– m4573r
Oct 2 '12 at 8:04
I can do this, but only at application level. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. This method is definitely slower.
– adnan kamili
Oct 2 '12 at 10:06
add a comment |
I have 2 strings, and i wish to queue the packet if it contains both the strings ( something like ("jsh"&&"gjhyg")), i tried following ways, but they don't seem to work:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm -m string --string "def" --algo bm
This doesn't work, it only works if the packet contains the string "abcdef", but the packet i wish to queue contains the strings at two different locations. Then I tried another method:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
But this time it works like "or", it queues packets with string "abc" or "def".
linux networking ubuntu iptables
edited Sep 10 '14 at 14:00
Kenster
4,93022034
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
I have 2 strings, and i wish to queue the packet if it contains both the strings ( something like ("jsh"&&"gjhyg")), i tried following ways, but they don't seem to work:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm -m string --string "def" --algo bm
This doesn't work, it only works if the packet contains the string "abcdef", but the packet i wish to queue contains the strings at two different locations. Then I tried another method:
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm
sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
But this time it works like "or", it queues packets with string "abc" or "def".
linux networking ubuntu iptables
linux networking ubuntu iptables
edited Sep 10 '14 at 14:00
Kenster
4,93022034
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
edited Sep 10 '14 at 14:00
Kenster
4,93022034
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
edited Sep 10 '14 at 14:00
Kenster
4,93022034
edited Sep 10 '14 at 14:00
Kenster
4,93022034
edited Sep 10 '14 at 14:00
Kenster
4,93022034
4,93022034
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
asked Oct 2 '12 at 6:29
adnan kamiliadnan kamili
2811515
2811515
I would have expected the first solution to work, since multiple-mare normally combined with anAND... and I can't find any reference of using regexp in the pattern. I'd say you just can't do it :/
– m4573r
Oct 2 '12 at 8:04
I can do this, but only at application level. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. This method is definitely slower.
– adnan kamili
Oct 2 '12 at 10:06
add a comment |
I would have expected the first solution to work, since multiple-mare normally combined with anAND... and I can't find any reference of using regexp in the pattern. I'd say you just can't do it :/
– m4573r
Oct 2 '12 at 8:04
I can do this, but only at application level. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. This method is definitely slower.
– adnan kamili
Oct 2 '12 at 10:06
I would have expected the first solution to work, since multiple
-m are normally combined with an AND... and I can't find any reference of using regexp in the pattern. I'd say you just can't do it :/– m4573r
Oct 2 '12 at 8:04
I would have expected the first solution to work, since multiple
-m are normally combined with an AND... and I can't find any reference of using regexp in the pattern. I'd say you just can't do it :/– m4573r
Oct 2 '12 at 8:04
I can do this, but only at application level. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. This method is definitely slower.
– adnan kamili
Oct 2 '12 at 10:06
I can do this, but only at application level. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. This method is definitely slower.
– adnan kamili
Oct 2 '12 at 10:06
add a comment |
1 Answer
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the "and" in this case could be achived with an user defined chain
sudo iptables -N my_chain
sudo iptables -A my_chain -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
sudo iptables -A INPUT -p tcp -j my_chain ! -f -m string --string "abc" --algo bm
when the input chain process the last line and "abc" is present the control jumps to my_chain which has a similar rule checking for the presence of "def"; if "def" is there then jumps to QUEUE.
answered Oct 9 '12 at 22:15
PatPat
2,5341021
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
the "and" in this case could be achived with an user defined chain
sudo iptables -N my_chain
sudo iptables -A my_chain -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
sudo iptables -A INPUT -p tcp -j my_chain ! -f -m string --string "abc" --algo bm
when the input chain process the last line and "abc" is present the control jumps to my_chain which has a similar rule checking for the presence of "def"; if "def" is there then jumps to QUEUE.
answered Oct 9 '12 at 22:15
PatPat
2,5341021
add a comment |
the "and" in this case could be achived with an user defined chain
sudo iptables -N my_chain
sudo iptables -A my_chain -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
sudo iptables -A INPUT -p tcp -j my_chain ! -f -m string --string "abc" --algo bm
when the input chain process the last line and "abc" is present the control jumps to my_chain which has a similar rule checking for the presence of "def"; if "def" is there then jumps to QUEUE.
answered Oct 9 '12 at 22:15
PatPat
2,5341021
add a comment |
the "and" in this case could be achived with an user defined chain
sudo iptables -N my_chain
sudo iptables -A my_chain -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
sudo iptables -A INPUT -p tcp -j my_chain ! -f -m string --string "abc" --algo bm
when the input chain process the last line and "abc" is present the control jumps to my_chain which has a similar rule checking for the presence of "def"; if "def" is there then jumps to QUEUE.
answered Oct 9 '12 at 22:15
PatPat
2,5341021
the "and" in this case could be achived with an user defined chain
sudo iptables -N my_chain
sudo iptables -A my_chain -p tcp -j QUEUE ! -f -m string --string "def" --algo bm
sudo iptables -A INPUT -p tcp -j my_chain ! -f -m string --string "abc" --algo bm
when the input chain process the last line and "abc" is present the control jumps to my_chain which has a similar rule checking for the presence of "def"; if "def" is there then jumps to QUEUE.
answered Oct 9 '12 at 22:15
PatPat
2,5341021
edited Oct 9 '12 at 22:23
answered Oct 9 '12 at 22:15
PatPat
2,5341021
answered Oct 9 '12 at 22:15
PatPat
2,5341021
answered Oct 9 '12 at 22:15
PatPat
2,5341021
2,5341021
add a comment |
add a comment |
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I would have expected the first solution to work, since multiple
-mare normally combined with anAND... and I can't find any reference of using regexp in the pattern. I'd say you just can't do it :/– m4573r
Oct 2 '12 at 8:04
I can do this, but only at application level. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. This method is definitely slower.
– adnan kamili
Oct 2 '12 at 10:06