[Snort-users] Snort doc error (?) - rule option not optional?
rhuang.work at ...11827...
Fri Mar 8 14:01:05 EST 2013
On Mar 8, 2013, at 10:45 AM, Russ Combs <rcombs at ...1935...> wrote:
> [… snip …]
> 2) If it's true that -T validates all included files, why isn't something that causes a Fatal error caught?
> OK - snort -T validates the conf but accepts rules w/o sid, defaulting the sid to zero. Drop the -T and you get a fatal error. W/or w/o -T, duplicate sid rules are resolved by selecting the highest rev.
Exactly! Apologies if I hadn't been more clear earlier.
> Not sure if there still is a use case for -T accepting rules without sid. I'll check and put in a bug assuming that isn't required.
> Please keep in mind that I am a brand-new user to Snort, some things that are obvious to the pro's are not really so to me unless they're explicitly documented somewhere.
> Thanks again to all those that have responded!
>> From: Ricky Huang
>> Sent: 3/7/2013 3:24 AM
>> To: snort-users at lists.sourceforge.net
>> Subject: [Snort-users] Snort doc error (?) - rule option not optional?
>> Hi all,
>> According to the rule doc (http://manual.snort.org/node28.html),
>>> Note that the rule options section is not specifically required by any rule, they are just used for the sake of making tighter definitions of packets to collect or alert on (or drop, for that matter).
>> So I created a rule,
>>> alert ICMP any any -> any any (msg:"Shut this rule off, it works now";)
>> which is included by snort.conf
>> If I run snort in test mode,
>>> snort -T -i igb0 -u snort -g snort -c /usr/local/etc/snort/snort.conf
>> it outputs success,
>>> Snort successfully validated the configuration!
>>> Snort exiting
>> Yet if I run it for production,
>>> snort -i igb0 -u snort -g snort -c /usr/local/etc/snort/snort.conf
>> it stops with the error,
>>> Initializing rule chains...
>>> ERROR: ./rules/myrules.rules(1) Each rule must contain a rule sid.
>>> Fatal Error, Quitting..
>> If I change my rule to:
>>> alert ICMP any any -> any any
>> It validates and starts fine.
>> Here's my Snort built info:
>>> # snort -V
>>> ,,_ -*> Snort! <*-
>>> o" )~ Version 2.9.4 GRE (Build 40) FreeBSD
>>> '''' By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team
>>> Copyright (C) 1998-2012 Sourcefire, Inc., et al.
>>> Using libpcap version 1.1.1
>>> Using PCRE version: 8.31 2012-07-06
>>> Using ZLIB version: 1.2.5
>> So I am wondering:
>> 1) The optional section is not completely optional (?)
>> 2) If there's indeed a requirement, why doesn't -T catch it?
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