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Re: Host Attribute Table Question
From: Alex Tatistcheff <alext () pobox com>
Date: Fri, 12 Nov 2010 13:47:08 -0500

As Joel said, entries in the host attribute xml file take precedence over
configs in the snort.conf.  So if you have a host in the attribute table you
have defined as an OS of Linux, Snort will use the Linux reassembly policy
for Frag3 and Stream5.  Regardless of what the default or even the IP
specific policy setting is in the snort.conf.

The default policy and any other IP specific host entries in snort.conf do
matter for hosts that are not defined in the host attribute table.  Best
practice is to set the default policy to match whichever operating system
type is the most prevalent on your network.


Alex Tatistcheff
alext () pobox com

The most terrifying words in the English language are, "I'm from the
government and I'm here to help." -Ronald Reagan


On Thu, Nov 11, 2010 at 1:15 PM, Andy Berryman <aberryman () cymtec com> wrote:

So, if it sees an IP for a windows host, and that host in in the attribute
table, what policy does snort use? The default windows policy? Or does the
policy not matter at all?



Andy



*From:* Joel Esler [mailto:jesler () sourcefire com]
*Sent:* Thursday, November 11, 2010 11:54 AM
*To:* Andy Berryman
*Cc:* snort-users () lists sourceforge net
*Subject:* Re: [Snort-users] Host Attribute Table Question



If Snort has an entry in the host attribute table for the IP that the
traffic is going to, Snort will use that entry for reassembly.  Otherwise it
uses the snort.conf config.



J



On Nov 11, 2010, at 12:37 PM, Andy Berryman wrote:



If I have a host attribute table that has windows and linux hosts in it,
and my snort.conf looks like the below text; what does snort do when it
see’s traffic for one of the linux hosts in the table?

Does it still give it the windows stream5 policy?





preprocessor frag3_global: max_frags 65536, prealloc_memcap 1073741824

preprocessor frag3_engine: policy first detect_anomalies timeout 180

#preprocessor frag3_engine: policy last detect_anomalies timeout 180

#preprocessor frag3_engine: policy linux detect_anomalies timeout 180

#preprocessor frag3_engine: policy bsd detect_anomalies timeout 180

preprocessor stream5_global: max_tcp 1048576, memcap 1073741824, track_tcp
yes, track_udp no

preprocessor stream5_tcp: policy windows, use_static_footprint_sizes,
dont_store_large_packets, ports client 21 22 23 25 42 53 79 80 109 110 111
113 119 135 136 137 139 143 110 111 161 445 513 514 691 1433 1521 2100 2301
3128 3306 6665 6666 6667 6668 6669 7000 8000 8080 8180 8888 32770 32771
32772 32773 32774 32775 32776 32777 32778 32779, ports both 443 465 563 636
989 992 993 994 995 7801 7702 7900 7901 7902 7903 7904 7905 7906 6907 7908
7909 7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920

preprocessor stream5_udp: ignore_any_rules



Thanks,

Andy Berryman
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Dell EqualLogic storage and VMware View: A highly scalable, end-to-end
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