Snort Updated to 2.7

shaddow501

Hello all

I have managed to set snort working but with some limitations, till a new working version will go be available
please note that it is only temporary option till the kind pfsense experts will get snort to work good but till then you can still have some kind of protection using snort
Here is what I did:

First on the snort setting page I have removed the mark for update rules automatically (this is for the changes I made will not be ruined by the next update)

Second:
I have made a change in the snort.conf file and removed the lines:

preprocessor frag2
preprocessor telnet_decode

now there is a catch, when you press save on the snort settings those lines are coming back to the snort.conf file, so make sure you do it last.

Third:
Entered the rule sets that I have enabled and removed all the lines referring to the UDP ports.
I did it using the edit file option in the pfsense.

Example: (you can copy and paste it into the using “edit file” option in pfsense /usr/local/etc/snort/rules/scan.rules)

Copyright 2001-2005 Sourcefire, Inc. All Rights Reserved

This file may contain proprietary rules that were created, tested and

certified by Sourcefire, Inc. (the "VRT Certified Rules") as well as

rules that were created by Sourcefire and other third parties and

distributed under the GNU General Public License (the "GPL Rules"). The

VRT Certified Rules contained in this file are the property of

Sourcefire, Inc. Copyright 2005 Sourcefire, Inc. All Rights Reserved.

The GPL Rules created by Sourcefire, Inc. are the property of

Sourcefire, Inc. Copyright 2002-2005 Sourcefire, Inc. All Rights

Reserved. All other GPL Rules are owned and copyrighted by their

respective owners (please see www.snort.org/contributors for a list of

owners and their respective copyrights). In order to determine what

rules are VRT Certified Rules or GPL Rules, please refer to the VRT

Certified Rules License Agreement.

$Id: scan.rules,v 1.39 2007/10/17 20:10:08 vrtbuild Exp $

#–---------

SCAN RULES

#-----------

These signatures are representitive of network scanners. These include

port scanning, ip mapping, and various application scanners.

NOTE: This does NOT include web scanners such as whisker. Those are

in web*

alert tcp $EXTERNAL_NET 10101 -> $HOME_NET any (msg:"SCAN myscan"; flow:stateless; ack:0; flags:S; ttl:>220; reference:arachnids,439; classtype:attempted-recon; sid:613; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 113 (msg:"SCAN ident version request"; flow:to_server,established; content:"VERSION|0A|"; depth:16; reference:arachnids,303; classtype:attempted-recon; sid:616; rev:4;)

alert tcp $EXTERNAL_NET any -> $HOME_NET 80 (msg:"SCAN cybercop os probe"; flow:stateless; dsize:0; flags:SF12; reference:arachnids,146; classtype:attempted-recon; sid:619; rev:7;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN FIN"; flow:stateless; flags:F,12; reference:arachnids,27; classtype:attempted-recon; sid:621; rev:8;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN ipEye SYN scan"; flow:stateless; flags:S; seq:1958810375; reference:arachnids,236; classtype:attempted-recon; sid:622; rev:8;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN NULL"; flow:stateless; ack:0; flags:0; seq:0; reference:arachnids,4; classtype:attempted-recon; sid:623; rev:7;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN SYN FIN"; flow:stateless; flags:SF,12; reference:arachnids,198; classtype:attempted-recon; sid:624; rev:8;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN XMAS"; flow:stateless; flags:SRAFPU,12; reference:arachnids,144; classtype:attempted-recon; sid:625; rev:8;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN nmap XMAS"; flow:stateless; flags:FPU,12; reference:arachnids,30; classtype:attempted-recon; sid:1228; rev:8;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN synscan portscan"; flow:stateless; flags:SF; id:39426; reference:arachnids,441; classtype:attempted-recon; sid:630; rev:7;)

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN cybercop os PA12 attempt"; flow:stateless; flags:PA12; content:"AAAAAAAAAAAAAAAA"; depth:16; reference:arachnids,149; classtype:attempted-recon; sid:626; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN cybercop os SFU12 probe"; flow:stateless; ack:0; flags:SFU12; content:"AAAAAAAAAAAAAAAA"; depth:16; reference:arachnids,150; classtype:attempted-recon; sid:627; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 22 (msg:"SCAN SSH Version map attempt"; flow:to_server,established; content:"Version_Mapper"; nocase; classtype:network-scan; sid:1638; rev:5;)
alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"SCAN SolarWinds IP scan attempt"; icode:0; itype:8; content:"SolarWinds.Net"; classtype:network-scan; sid:1918; rev:6;)
alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"SCAN cybercop os probe"; flow:stateless; ack:0; flags:SFP; content:"AAAAAAAAAAAAAAAA"; depth:16; reference:arachnids,145; classtype:attempted-recon; sid:1133; rev:12;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 5000 (msg:"SCAN UPnP service discover attempt"; flow:to_server,established; content:"M-SEARCH "; depth:9; content:"ssdp|3A|discover"; classtype:network-scan; sid:8081; rev:1;)

#anyway I hope it will help for some users#

dont forget to restart/start again the snort service
I have attached some files for some snort rules, just copy and paste it at the right place....
also attached snort.conf for you to view

Update: to aviod changing all the time the snort.conf, just do that change in snort.inc that is placed at: /usr/local/pkg/snort.inc
then it will apply into the snort.conf forever.
I have added the snort.inc file so you can copy and paste it into your system using again... edit file in pfsense gui.

snort_conf.txt
scan.txt
DOS.txt
DDOS.txt
Snort_inc.txt

shaddow501

Hello All

Please report if it does help for you as well…..

shaddow501

Hello All

Whoever that build the last version of snort can build it with this line and post it?

./configure –enable-stream4udp

?

yozh

SO as of right now snort is not working ?

shaddow501

Hello All

SNORT IS FIXED !!!!

After long hours with reading and testing, I was finally able to find and to fix the problems.

In order that snort will work also in your system, and till sullrich will upload my snort.inc instead of the older one you will need to do some things in order that snort will work in your pfsense box as well.

the easiest way is enter to the edit file tab in pfsense web gui and open this file: /usr/local/pkg/snort.inc

Replace its full consents with the text file I have added to this post, and dont forget to press save.

then update the rules, enter to setting and press save, it will set the snort.inc setting into your configuration file and from now snort is operational.

Please update to know that the file work for you all.

Ilan.

snort_inc.txt

sullrich

Commited, thanks a million for the efforts.

;D I just did a snort package install and the new version works 100% Thank You !!! ;D ;D

yozh

It works and the rules seems to be downloading, but it takes a very long time to install them and it seems to be stuck in the middle of the install and then says that rules never were updated its cosmetic I belive at this time, but what happenes when it tried to auto update the rules ?

AhnHEL

Mine is working fantastic and i even used Morbus' edit to add the ac-bnfa mode to the Snort Settings Performance mode list. Now if we could just get this Mozilla Browser Bug Fix committed, Snort would be working perfectly.

yozh

Hmm also the blocking doesnt seem to fully work. I see TCP portsweeps in the alerts but no blocked hosts and in settings the "Block offenders" is checked. Strange

shiftyjoe

Hi all,

Just switch to pfsense 1.2-RC3 from IP cop and I am having issues with the snort package. I have installed the latest, 2.7.0.1_3 and I don't seem to be getting any alerts (which I know should be there, ipcop reported a number of hits per day) I have snort running with the ac method and most of the rules selected. Below is the log when I start snort.

Dec 12 09:06:39 snort2c[21009]: snort2c running in daemon mode pid: 21009
Dec 12 09:06:39 snort2c[21009]: snort2c running in daemon mode pid: 21009
Dec 12 09:06:39 snort2c[20088]: SIGTERM received - exiting
Dec 12 09:06:39 snort2c[20088]: SIGTERM received - exiting
Dec 12 09:01:23 SnortStartup[20115]: Ram free BEFORE starting Snort: 402M – Ram free AFTER starting Snort: 822M -- Mode ac -- Snort memory usage:
Dec 12 09:01:07 snort[19527]: ACSM-No Memory: acsmCompile!
Dec 12 09:01:07 snort[19527]: ACSM-No Memory: acsmCompile!
Dec 12 09:01:05 snort2c[20088]: snort2c running in daemon mode pid: 20088
Dec 12 09:01:05 snort2c[20088]: snort2c running in daemon mode pid: 20088
Dec 12 09:01:05 snort[20007]: Daemon parent exiting
Dec 12 09:01:05 snort[20007]: Daemon parent exiting
Dec 12 09:01:05 snort[20007]: Child exited unexpectedly
Dec 12 09:01:05 snort[20007]: Child exited unexpectedly
Dec 12 09:01:04 snort[20026]: FATAL ERROR: Failed to Lock PID File "/var/run//snort_fxp1.pid" for PID "20026"
Dec 12 09:01:04 snort[20026]: FATAL ERROR: Failed to Lock PID File "/var/run//snort_fxp1.pid" for PID "20026"
Dec 12 09:01:04 snort[20026]: PID path stat checked out ok, PID path set to /var/run/
Dec 12 09:01:04 snort[20026]: PID path stat checked out ok, PID path set to /var/run/

I am confused by the fatal error and the report of 402m of free memory before snort run… and 822m after it starts. fxp1 is my wan nic.

Any suggestions?

AhnHEL

I've gotten that type of error in the past. X out any blocked IPs in the Blocked tab, Clear the log on the Alerts tab, and hit Save again in the Categories tab. Also, if you're using a majority of the categories, read page 1 of this post on using ac-bnfa mode. Mine craps out when using ac mode and using a lot of categories

Well snort did work ,Now it crashes pfsense .So i did a reinstall of pfsense and installed snort and tryed to update now i get this snort rules: md5 signature of rules mismatch.So i guess i will go back to my d-link . >:(

shiftyjoe

onhel - Thanks for the help, changed to ac-bnfa and snort is much happier now.

cdx304 - "Well snort did work ,Now it crashes pfsense .So i did a reinstall of pfsense and installed snort and tryed to update now i get this snort rules: md5 signature of rules mismatch.So i guess i will go back to my d-link . Angry"

Not sure if it will help, but I've gotten this message. After a fifteen minute wait, I could re download the rules without an issue.

AhnHEL

Yes, I have gotten the md5 mismatch a couple of times as well during the testing of Snort 2.7.0.1_1 and 2.7.0.1_2. A second attempt to download rules always cleared up this error.

While I have this post up, I'd like to give my thanks to Sullrich for maintaining the package and Shaddow501 for his help to Sullrich in getting the problems with 2.7 resolved so quickly for all of us end-users. Great job guys.

rt_rex

@onhel:

Yes, I have gotten the md5 mismatch a couple of times as well during the testing of Snort 2.7.0.1_1 and 2.7.0.1_2. A second attempt to download rules always cleared up this error.

While I have this post up, I'd like to give my thanks to Sullrich for maintaining the package and Shaddow501 for his help to Sullrich in getting the problems with 2.7 resolved so quickly for all of us end-users. Great job guys.

There is a 2.7.0.1_3 version working ok here

Pfsense crashes now with snort installed .

AhnHEL

Define @cdx304:

Pfsense crashes now with snort installed .

Define "crash."

Please elaborate.

Mine is running great, possibly a hardware issue?

shaddow501

Hi All

After a few days working with snort i have found that it doesnt remove the blocked IP after 60 min, maybe it is something with the configuration i am nit sure yet.

i do think that should be a line in the cron configuration that after a specific time it removes the blocked IPs, or maybe i am wrong…

Did anyone notice that problem or is it just something messed up in my system.

anyway any information where i should write this line i will appreciate.

shiftyjoe

This post (http://forum.pfsense.org/index.php/topic,5902.0.html) is talking about how to change the time it take before the ip's are removed.

Sullrich says "You can change the reset time by modifying /cf/conf/config.xml from Diagnostics -> Edit File.

Look for the cron entry that runs the command /usr/local/sbin/expiretable -t 1800 snort2c.

Change the <minute>60</minute> to whatever you like. Then go to Diagnostics -> Command Prompt and in the PHP command box issue the command:

configure_cron();"

I'ld check to make sure the cron job is schedualed.