Snort mailing list archives

Re: Question about rules

From: Joel Esler <jesler () sourcefire com>
Date: Wed, 27 Jan 2010 09:13:10 -0500

Am I reading it wrong, or does your rule look for test_rule, but your <h1>
tag on the page you created say "teste_rule"?

J

On Wed, Jan 27, 2010 at 8:40 AM, Ricardo Barbosa <
ricardobarbosams () yahoo com br> wrote:

hello rmkml

tested with the parameter-k none, however it did not work
the lib pcap installed but I noticed this in the logs that he does not use
it. getting a "snort not using pcap frames. Do I need to use to snort pcap
lib? Is this the cause of it not quite get the http payload. Because I
changed the rule and how I am doing tests from the browser text links
changed the content:"Links" and it worked. I put the word "Links" because
it oque appears in the wireshark logs. How do I enable the lib pcap with
snort?

I thank.

Regards,

--- Em *qua, 27/1/10, rmkml <rmkml () free fr>* escreveu:


De: rmkml <rmkml () free fr>
Assunto: Re: [Snort-users] Question about rules
Para: "Ricardo Barbosa" <ricardobarbosams () yahoo com br>
Cc: rmkml () free fr
Data: Quarta-feira, 27 de Janeiro de 2010, 7:46

ok thx you,
maybe you have a (network) pcap please?
do you have tested adding "-k none" on cmd line start snort ?
Regards
Rmkml


On Wed, 27 Jan 2010, Ricardo Barbosa wrote:

Hi rmkml

answering questions

what snort version you test please?


root@capsula:~# snort -V

   ,,_     -*> Snort! <*-
  o"  )~   Version 2.8.4.1 (Build 38)
   ''''    By Martin Roesch & The Snort Team:
http://www.snort.org/team.html
           Copyright (C) 1998-2009 Sourcefire, Inc., et al.
           Using PCRE version: 7.8 2008-09-05

root@capsula:~#

Do you send your conf?


/etc/snort/snort.debian.conf
DEBIAN_SNORT_STARTUP="boot"
DEBIAN_SNORT_HOME_NET="20.0.0.0/8"
DEBIAN_SNORT_OPTIONS=""
DEBIAN_SNORT_INTERFACE="eth0"
DEBIAN_SNORT_SEND_STATS="true"
DEBIAN_SNORT_STATS_RCPT="root"
DEBIAN_SNORT_STATS_THRESHOLD="1"
/etc/snort/snort.conf
var HOME_NET $eth0_ADDRESS
var EXTERNAL_NET any
var DNS_SERVERS $HOME_NET
var SMTP_SERVERS $HOME_NET
var HTTP_SERVERS $HOME_NET
var SQL_SERVERS $HOME_NET
var TELNET_SERVERS $HOME_NET
var SNMP_SERVERS $HOME_NET
portvar HTTP_PORTS 80
portvar SHELLCODE_PORTS !80
portvar ORACLE_PORTS 1521
var AIM_SERVERS
[

64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205..188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24
]

var RULE_PATH /etc/snort/rules
var PREPROC_RULE_PATH /etc/snort/preproc_rules
dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
preprocessor frag3_global: max_frags 65536
preprocessor frag3_engine: policy first detect_anomalies
preprocessor stream5_global: max_tcp 8192, track_tcp yes, \
                              track_udp no
preprocessor stream5_tcp: policy first, use_static_footprint_sizes
preprocessor http_inspect: global \
    iis_unicode_map unicode.map 1252
preprocessor http_inspect_server: server default \
    profile all ports { 80 8080 8180 } oversize_dir_length 500
preprocessor rpc_decode: 111 32771
preprocessor bo
preprocessor ftp_telnet: global \
   encrypted_traffic yes \
   inspection_type stateful
preprocessor ftp_telnet_protocol: telnet \
   normalize \
   ayt_attack_thresh 200
preprocessor ftp_telnet_protocol: ftp server default \
   def_max_param_len 100 \
   alt_max_param_len 200 { CWD } \
   cmd_validity MODE < char ASBCZ > \
   cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
   chk_str_fmt { USER PASS RNFR RNTO SITE MKD } \
   telnet_cmds yes \
   data_chan
preprocessor ftp_telnet_protocol: ftp client default \
   max_resp_len 256 \
   bounce yes \
   telnet_cmds yes
preprocessor smtp: \
  ports { 25 587 691 } \
  inspection_type stateful \
  normalize cmds \
  normalize_cmds { EXPN VRFY RCPT } \
  alt_max_command_line_len 260 { MAIL } \
  alt_max_command_line_len 300 { RCPT } \
  alt_max_command_line_len 500 { HELP HELO ETRN } \
  alt_max_command_line_len 255 { EXPN VRFY }
preprocessor sfportscan: proto  { all } \
                         memcap { 10000000 } \
                         sense_level { low }
preprocessor dcerpc2
preprocessor dcerpc2_server: default
preprocessor dns: \
    ports { 53 } \
    enable_rdata_overflow
preprocessor ssl: noinspect_encrypted, trustservers
output log_tcpdump: tcpdump.log
include classification.config
include reference.config
include $RULE_PATH/local.rules
include $RULE_PATH/bad-traffic.rules
include $RULE_PATH/exploit.rules
include $RULE_PATH/community-exploit.rules
include $RULE_PATH/scan.rules
include $RULE_PATH/finger.rules
include $RULE_PATH/ftp.rules
include $RULE_PATH/telnet.rules
include $RULE_PATH/rpc.rules
include $RULE_PATH/rservices.rules
include $RULE_PATH/dos.rules
include $RULE_PATH/community-dos.rules
include $RULE_PATH/ddos.rules
include $RULE_PATH/dns.rules
include $RULE_PATH/tftp.rules
include $RULE_PATH/web-cgi.rules
include $RULE_PATH/web-coldfusion.rules
include $RULE_PATH/web-iis.rules
include $RULE_PATH/web-frontpage.rules
include $RULE_PATH/web-misc.rules
include $RULE_PATH/web-client.rules
include $RULE_PATH/web-php.rules
include $RULE_PATH/community-sql-injection.rules
include $RULE_PATH/community-web-client.rules
include $RULE_PATH/community-web-dos.rules
include $RULE_PATH/community-web-iis.rules
include $RULE_PATH/community-web-misc.rules
include $RULE_PATH/community-web-php.rules
include $RULE_PATH/sql.rules
include $RULE_PATH/x11.rules
include $RULE_PATH/icmp.rules
include $RULE_PATH/netbios.rules
include $RULE_PATH/misc.rules
include $RULE_PATH/attack-responses.rules
include $RULE_PATH/oracle.rules
include $RULE_PATH/community-oracle.rules
include $RULE_PATH/mysql.rules
include $RULE_PATH/snmp.rules
include $RULE_PATH/community-ftp.rules
include $RULE_PATH/smtp.rules
include $RULE_PATH/community-smtp.rules
include $RULE_PATH/imap.rules
include $RULE_PATH/community-imap.rules
include $RULE_PATH/pop2..rules
include $RULE_PATH/pop3.rules
include $RULE_PATH/nntp.rules
include $RULE_PATH/community-nntp.rules
include $RULE_PATH/community-sip.rules
include $RULE_PATH/other-ids.rules
include $RULE_PATH/web-attacks.rules
include $RULE_PATH/backdoor.rules
include $RULE_PATH/community-bot.rules
include $RULE_PATH/community-virus.rules
include $RULE_PATH/experimental.rules
include threshold.conf

snort cmd line starting please?


/usr/sbin/snort -m 027 -D -d -v -l /var/log/snort -u snort -g snort
-c /etc/snort/snort.conf -S HOME_NET=[10.0.0.0/8] -i eth0

for example, maybe disable checksum with '-k none' on cmd line...
you have created a html page (http reply server side), and you have
created a snort rule on client (to server) side...
Regards

In desperation, I tried the following rules

alert tcp 10.0.0.0/8 80 -> any any (content:"teste rule"; msg:"TEST
HTTP"; sid:100000000;)
alert tcp any any <> any any (content:"teste rule"; msg:"TEST HTTP";
sid:100000000;)
alert tcp any any <> any any (content:"teste rule"; http_client_body;
msg:"TEST HTTP"; sid:100000000; depth:1000;)

without sucess in all.

no idea where i can be wrong or missing some pre-processador. I thank

Regards.

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-- 
Joel Esler

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Current thread:

Question about rules Ricardo Barbosa (Jan 26)
- <Possible follow-ups>
- Re: Question about rules Ricardo Barbosa (Jan 27)
  - Re: Question about rules Matt Olney (Jan 27)
    - Re: Question about rules Ricardo Barbosa (Jan 27)
- Re: Question about rules Ricardo Barbosa (Jan 27)
  - Re: Question about rules Joel Esler (Jan 27)
- Re: Question about rules Ricardo Barbosa (Jan 27)