Snort mailing list archives
Re: Network Variables
From: "Seth Dunn" <seth () d2ms com>
Date: Thu, 2 May 2013 11:06:18 -0400
This works:: C:\>d:\snort\bin\snort -c d:\snort\etc\snort2.conf -i2 -T "not net 10.10.0.0/24 and dst host 10.75.45.1 && dst port 80 or not net 10.30.0.0/24 and dst host 10.7 5.45.1 && dst port 80" So how can I transfer that from the command line, to the bpf file? Because as I mentioned earlier, using multiple lines in the file, it fails. Trying to comment a line, it fails. Not to mention that when using the bpf file, it seems to stop alerting on anything.....so all traffic is captured, because I see activity on the interface....but snort does not alert on stuff it should. -----Original Message----- From: Castle, Shane [mailto:scastle () bouldercounty org] Sent: Thursday, May 02, 2013 10:51 AM To: Seth Dunn; 'James Lay'; 'Snort' Subject: RE: [Snort-users] Network Variables I dunno - I can parse that BPF expression several different ways, and the parsing results in different capture characteristics. Does the first "not" apply to just "net 10.10.0.0/24" or to the expr "net 10.10.0.0/24 and dst host 10.75.45.1 && dst port 80"? (For instance.) This depends on the precedence and order of how Snort parses the string. I can find no doc on this in the Snort manpage, the tcpdump manpage, or the Snort manual. I suggest using parentheses for grouping so that your intent is clear. -- Shane Castle Data Security Mgr, Boulder County IT -----Original Message----- From: Seth Dunn [mailto:seth () d2ms com] Sent: Thursday, May 02, 2013 08:09 To: James Lay; Snort Subject: Re: [Snort-users] Network Variables Also of note. It seems that if snort starts with a bpf file configured....then for whatever reason, all traffic is no longer monitored, even though snort has started. So while this rule:: not net 10.10.0.0/24 and dst host 10.75.45.1 && dst port 80 or not net 10.30.0.0/24 and dst host 10.75.45.1 && dst port 80 is pretty specific..... I have another rule set in my local.rules file that should alert on any FTP attempt to IP 10.76.65.1....and if the bpf file is configured for snort, then the attempt is not alerted by snort. If I remove the bpf file from being used, then any FTP attempt is again alerted. From: James Lay [mailto:jlay () slave-tothe-box net] Sent: Thursday, May 02, 2013 8:10 AM To: Snort Subject: Re: [Snort-users] Network Variables Quotation marks may be needed...try appending via command line as well. James On May 2, 2013, at 5:50 AM, Seth Dunn <seth () d2ms com> wrote: What is DAQ? I have seen that, but have no idea what that is. As far as my bpf file goes, if it is like this:: #not net 10.10.0.0/24 and not net 10.30.0.0/24 not net 10.10.0.0/24 and dst host 10.75.45.1 && dst port 80 or not net 10.30.0.0/24 and dst host 10.75.45.1 && dst port 80 It will fail with:: Reading filter from bpf file: D:\Snort\etc\ignore2.bpf ERROR: short read D:\Snort\etc\ignore2.bpf (169 != 170) Fatal Error, Quitting.. If I remove the commented line, then snort starts fine. If I try to have multiple lines in the file, (all being rules, no comments) the it will fail with a similar error as above. I have never seen a DAQ error. From: Russ Combs [mailto:rcombs () sourcefire com] Sent: Thursday, May 02, 2013 12:08 AM To: waldo kitty Cc: snort-users () lists sourceforge net Subject: Re: [Snort-users] Network Variables Snort does allow comments in the BPF file, starting with # to end of line. If there is a syntax error, you should see something like: ERROR: Can't set DAQ BPF filter to ' ... ' (pcap_daq_set_filter: pcap_compile: syntax error)! Fatal Error, Quitting.. What DAQ are you using? Please send the BPF file that fails and the error that you get. On Wed, May 1, 2013 at 10:07 PM, waldo kitty <wkitty42 () windstream net> wrote: On 5/1/2013 13:09, Seth Dunn wrote:
But any ideas why snort fails to start if I add in a '#' to comment a line??
i have no clue but it sounds like a coding error not allowing comment lines i the BPF file... only joel or one of the snort dev guys can tell us that... or possibly a code diver who can root around in the snort code ;) -- NOTE: No off-list assistance is given without prior approval. Please keep mailing list traffic on the list unless private contact is specifically requested and granted. ------------------------------------------------------------------------ ------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------ ------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1______________________________________ _________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- Re: Network Variables, (continued)
- Re: Network Variables beenph (May 02)
- Re: Network Variables James Lay (May 02)
- Re: Network Variables Seth Dunn (May 02)
- Re: Network Variables Seth Dunn (May 02)
- Re: Network Variables waldo kitty (May 02)
- Re: Network Variables James Lay (May 02)
- Re: Network Variables waldo kitty (May 02)
- Message not available
- Re: Network Variables Seth Dunn (May 02)
- Re: Network Variables waldo kitty (May 02)
- Re: Network Variables Seth Dunn (May 02)
- Re: Network Variables Seth Dunn (May 02)
- Re: Network Variables James Lay (May 02)
- Re: Network Variables Russ Combs (May 02)
- Re: Network Variables waldo kitty (May 02)
- Re: Network Variables seth (May 02)