Re: Activate and dynamic rules

["Al Lewis (allewi)" <allewi () cisco com>]

Hello,

                FYI… The active/dynamic rules are being phased out. See the manual here: 
http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node29.html#SECTION00426000000000000000



It is recommended that tagging is used:

Tagging section:


http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node34.html#tag_section


A tagging rule would be something like:

alert tcp any any -> any any (msg:"TAGGED"; content:"GET"; tag:host,3,packets,src; sid:1;)

This would log 3 packets after the initlal alert that have the source address in them.


./bin/snort -c etc/TEST.conf -r /home/alewis/Downloads/STUFF/CURL.pcap -l . -H -U -k none -q

root@big-debbie:/var/tmp/snort-2.9.8.2# tcpdump -n -r snort.log.1464271674
reading from file snort.log.1464271674, link-type EN10MB (Ethernet)
05:28:13.430908 IP 10.0.2.15.49126 > 199.43.0.43.80: Flags [P.], seq 238023807:238023883, ack 109504002, win 29200, 
length 76
05:28:13.431802 IP 199.43.0.43.80 > 10.0.2.15.49126: Flags [.], ack 76, win 65535, length 0
05:28:13.456438 IP 199.43.0.43.80 > 10.0.2.15.49126: Flags [P.], seq 1:529, ack 76, win 65535, length 528
05:28:13.456486 IP 10.0.2.15.49126 > 199.43.0.43.80: Flags [.], ack 529, win 30016, length 0
root@big-debbie:/var/tmp/snort-2.9.8.2#


Hope this helps.

Albert Lewis
QA SNORT/Sourcefire
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi () cisco com

From: Nicolas Matovelle Trigo [mailto:nicolas.matovelle () tarlogic com]
Sent: Thursday, May 26, 2016 7:56 AM
To: snort-users () lists sourceforge net
Subject: [Snort-users] Activate and dynamic rules

Hi, I've just started using snort and I can't get it working.

I've installed it in a CentOS 7.2 virtual machine and configured it to act as gateway for other network and it works. 
At the first moment I set only the following rule:

"alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg: "ICMP response"; sid:123)"

And I could saw the responses on the alert file.

But now I'm trying to use a dynamic rule like the following:

activate tcp $HOME_NET any -> $EXTERNAL_NET 1024 (msg:"Activating"; sid:100; activates:1;)
dynamic tcp any any <> any any (msg:"Dynamic not activated"; sid:101; activated_by:1; count: 10000;)

The actual behavior is that snort alerts the "Activating" rule, but I never see the "Dynamic not activated" message. 
The only thing not common in my configuration is that I commented out the line "dynamicdetection directory 
/usr/local/lib/snort_dynamicrules" from the snort.conf as I don't have such directory and snort failed to start with 
that line.

Thanks in advance for your attention,
Nico.

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