[Snort-users] Trouble not getting unified2 files to write.

Tony Reusser treusser at ...15879...
Mon Oct 15 17:31:57 EDT 2012


Thomison,

Here's a sanitized excerpt from my snort.conf showing my output line:

output unified2: filename /volume2/snort/p2p1_logs/snort_p2p1.u2, limit 128

the "filename" is literal.  I also have my IDS server setup with two promisc
interfaces (p2p1 and p2p2) connected to two different network segments.  I
have a separate instance of snort for each interface with a separate .conf
file for each.

First of all, the "unified2" output format should create a file with a
"*.u2" extension.  With this option there are not separate files for logs
and alerts.  Both packet logs and alerts are binary encoded in the same
file.  Then you need something like barnyard to read the *.u2 file and
either output it to human readable files, or, in my case, populate a MySQL
database for a web-based GUI like BASE to read from.

Hope this helps.

	-Tony Reusser


-----Original Message-----
From: Thomison, Lee [mailto:ThomisonL at ...15885...] 
Sent: Monday, October 15, 2012 2:13 PM
To: 'snort-users at lists.sourceforge.net'
Subject: [Snort-users] Trouble not getting unified2 files to write.

Hi folks,

I'm having trouble getting snort to write the unified2 output from
/etc/snort/snort.conf.  Googling shows this to be a fairly common issue, but
none of the solutions I located (such as
http://seclists.org/snort/2010/q1/847 Re: Unable to configure unified2
output, removing the -A option from the command line )  seems to correct the
problem.

This is on a Scientific Linux 6.2 box, which is a RHEL derivative.  I
compiled from:

snort-2.9.3.1-1.src.rpm

$ rpm -i snort-2.9.3.1-1.src.rpm
$ (edit snort.spec to add --with-sourcefire) $ rpmbuild -ba snort.spec $
sudo rpm -i ~/rpmbuild/RPMS/x86_64/snort-xx.rpm
$ cd /etc/snort/rules
$ sudo tar xvzf snortrules-xx.tar.gz
$ cd etc
$ sudo cp <everything except snort.conf> /etc/snort/rules $ sudo chown -R
snort:snort /etc/snort $ sudo chown -R snort:snort /var/log/snort $ sudo
service snortd start

$ ps -ef | grep snort

snort     8987     1  0 11:46 ?        00:00:00 /usr/sbin/snort -b -d -D -i
eth4 -u snort -g snort -c /etc/snort/snort.conf -l /var/log/snort/eth4

----------------------------------------------

One bit of evidence is that snort is writing:

-rw-rw-r--+ 1 snort snort    0 Oct 15 11:29 alert
-rw-rw-r--+ 1 snort snort    0 Oct 15 11:46 snort.log.1350330384

(the 0 sizes are ok I think because I don't actually have anything plugged
into eth4 at this time).

which the man page says are the defaults.  So I'm wondering if snort is even
reading /etc/snort/snort.conf?  Or whether snort.conf is being ignored in
favour of redhat's thrice-damned sysconfig file /etc/sysconfig/snort ?
Which it does seem to be picking up since it's looking for eth4.

So...what idiotically obvious thing am I missing here?

Thanks in advance,

----------------------------------------------

Here are the pertinent files and data:

---------------------------------------------

from /etc/snort/snort.conf (full snort.conf below):

###################################################
# Step #6: Configure output plugins
# For more information, see Snort Manual, Configuring Snort - Output Modules
###################################################

# unified2
# Recommended for most installs
output unified2: filename merged.log, limit 128, nostamp, mpls_event_types,
vlan_event_types

# Additional configuration for specific types of installs # output
alert_unified2: filename snort.alert, limit 128, nostamp # output
log_unified2: filename snort.log, limit 128, nostamp

# syslog
# output alert_syslog: LOG_AUTH LOG_ALERT

# pcap
# output log_tcpdump: tcpdump.log

--------------------------------------------

$ cat /etc/sysconfig/snort
# /etc/sysconfig/snort
# $Id$

# All of these options with the exception of -c, which tells Snort where #
the configuration file is, may be specified in that configuration file as #
well as the command line. Both the command line and config file options #
are listed here for reference.


#### General Configuration

# What interface should snort listen on?  [Pick only 1 of the next 3!] #
This is -i {interface} on the command line # This is the snort.conf config
interface: {interface} directive
INTERFACE=eth4
#
# The following two options are not directly supported on the command line #
or in the conf file and assume the same Snort configuration for all #
instances # # To listen on all interfaces use this:
#INTERFACE=ALL
#
# To listen only on given interfaces use this:
#INTERFACE="eth1 eth2 eth3 eth4 eth5"


# Where is Snort's configuration file?
# -c {/path/to/snort.conf}
CONF=/etc/snort/snort.conf

# What user and group should Snort drop to after starting? This user and #
group should have very few privileges.
# -u {user} -g {group}
# config set_uid: user
# config set_gid: group
USER=snort
GROUP=snort

# Should Snort change the order in which the rules are applied to packets.
# Instead of being applied in the standard Alert->Pass->Log order, this will
# apply them in Pass->Alert->Log order.
# -o
# config order: {actions in order}
# e.g. config order: log alert pass activation dynamic suspicious redalert
PASS_FIRST=0


#### Logging & Alerting

# NOTE: NO_PACKET_LOG and BINARY_LOG, ALERTMODE, etc. are mutually #
exclusive. Use either NO_PACKET_LOG or any/all of the other logging #
options. But the more logging options use you, the slower Snort will run.


# Where should Snort log?
# -l {/path/to/logdir}
# config logdir: {/path/to/logdir}
LOGDIR=/var/log/snort

# How should Snort alert? Valid alert modes include fast, full, none, and #
unsock.  Fast writes alerts to the default "alert" file in a single-line, #
syslog style alert message.  Full writes the alert to the "alert" file #
with the full decoded header as well as the alert message.  None turns off #
alerting. Unsock is an experimental mode that sends the alert information #
out over a UNIX socket to another process that attaches to that socket.
# -A {alert-mode}
# output alert_{type}: {options}
ALERTMODE=fast

# Should Snort dump the application layer data when displaying packets in #
verbose or packet logging mode.
# -d
# config dump_payload
DUMP_APP=1

# Should Snort keep binary (AKA pcap, AKA tcpdump) logs also? This is #
recommended as it provides very useful information for investigations.
# -b
# output log_tcpdump: {log name}
BINARY_LOG=1

# Should Snort turn off packet logging?  The program still generates #
alerts normally.
# -N
# config nolog
NO_PACKET_LOG=0

# Print out the receiving interface name in alerts.
# -I
# config alert_with_interface_name
PRINT_INTERFACE=0

# When dumping the stats, what log file should we look in
SYSLOG=/var/log/messages

# When dumping the stats, how long to wait to make sure that syslog can #
flush data to disk
SECS=5

# To add a BPF filter to the command line uncomment the following variable #
syntax corresponds to tcpdump(8) #BPF="not host 192.168.1.1"

# To use an external BPF filter file uncomment the following variable #
syntax corresponds to tcpdump(8) # -F {/path/to/bpf_file} # config bpf_file:
/path/to/bpf_file #BPFFILE=/etc/snort/bpf_file

----------------------------

full /etc/snort/snort.conf:

$ cat /etc/snort/snort.conf
#--------------------------------------------------
#   VRT Rule Packages Snort.conf
#
#   For more information visit us at:
#     http://www.snort.org                   Snort Website
#     http://vrt-sourcefire.blogspot.com/    Sourcefire VRT Blog
#
#     Mailing list Contact:      snort-sigs at lists.sourceforge.net
#     False Positive reports:    fp at ...1935...
#     Snort bugs:                bugs at ...950...
#
#     Compatible with Snort Versions:
#     VERSIONS : 2.9.3.1
#
#     Snort build options:
#     OPTIONS : --enable-ipv6 --enable-gre --enable-mpls
--enable-targetbased --enable-ppm --enable-perfprofiling --enable-zlib
--enable-active-response --enable-normalizer --enable-reload --enable-react
--enable-flexresp3
#
#     Additional information:
#     This configuration file enables active response, to run snort in
#     test mode -T you are required to supply an interface -i <interface>
#     or test mode will fail to fully validate the configuration and
#     exit with a FATAL error
#--------------------------------------------------

###################################################
# This file contains a sample snort configuration.
# You should take the following steps to create your own custom
configuration:
#
#  1) Set the network variables.
#  2) Configure the decoder
#  3) Configure the base detection engine #  4) Configure dynamic loaded
libraries #  5) Configure preprocessors #  6) Configure output plugins #  7)
Customize your rule set #  8) Customize preprocessor and decoder rule set #
9) Customize shared object rule set
###################################################

###################################################
# Step #1: Set the network variables.  For more information, see
README.variables ###################################################

# Setup the network addresses you are protecting ipvar HOME_NET any

# Set up the external network addresses. Leave as "any" in most situations
ipvar EXTERNAL_NET any

# List of DNS servers on your network
ipvar DNS_SERVERS $HOME_NET

# List of SMTP servers on your network
ipvar SMTP_SERVERS $HOME_NET

# List of web servers on your network
ipvar HTTP_SERVERS $HOME_NET

# List of sql servers on your network
ipvar SQL_SERVERS $HOME_NET

# List of telnet servers on your network ipvar TELNET_SERVERS $HOME_NET

# List of ssh servers on your network
ipvar SSH_SERVERS $HOME_NET

# List of ftp servers on your network
ipvar FTP_SERVERS $HOME_NET

# List of sip servers on your network
ipvar SIP_SERVERS $HOME_NET

# List of ports you run web servers on
portvar HTTP_PORTS
[80,81,311,591,593,901,1220,1414,1830,2301,2381,2809,3128,3702,4343,5250,700
1,7145,7510,7777,7779,8000,8008,8014,8028,8080,8088,8118,8123,8180,8181,8243
,8280,8800,8888,8899,9080,9090,9091,9443,9999,11371,55555]

# List of ports you want to look for SHELLCODE on.
portvar SHELLCODE_PORTS !80

# List of ports you might see oracle attacks on portvar ORACLE_PORTS 1024:

# List of ports you want to look for SSH connections on:
portvar SSH_PORTS 22

# List of ports you run ftp servers on
portvar FTP_PORTS [21,2100,3535]

# List of ports you run SIP servers on
portvar SIP_PORTS [5060,5061,5600]

# List of file data ports for file inspection portvar FILE_DATA_PORTS
[$HTTP_PORTS,110,143]

# List of GTP ports for GTP preprocessor portvar GTP_PORTS [2123,2152,3386]

# other variables, these should not be modified ipvar AIM_SERVERS
[64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,20
5.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,2
05.188.179.0/24,205.188.248.0/24]

# Path to your rules files (this can be a relative path) # Note for Windows
users:  You are advised to make this an absolute path, # such as:
c:\snort\rules var RULE_PATH /etc/snort/rules var SO_RULE_PATH
/etc/snort/so_rules var PREPROC_RULE_PATH /etc/snort/preproc_rules

# If you are using reputation preprocessor set these # Currently there is a
bug with relative paths, they are relative to where snort is # not relative
to snort.conf like the above variables # This is completely inconsistent
with how other vars work, BUG 89986 # Set the absolute path appropriately
var WHITE_LIST_PATH /etc/snort/rules var BLACK_LIST_PATH /etc/snort/rules

###################################################
# Step #2: Configure the decoder.  For more information, see README.decode
###################################################

# Stop generic decode events:
config disable_decode_alerts

# Stop Alerts on experimental TCP options config
disable_tcpopt_experimental_alerts

# Stop Alerts on obsolete TCP options
config disable_tcpopt_obsolete_alerts

# Stop Alerts on T/TCP alerts
config disable_tcpopt_ttcp_alerts

# Stop Alerts on all other TCPOption type events:
config disable_tcpopt_alerts

# Stop Alerts on invalid ip options
config disable_ipopt_alerts

# Alert if value in length field (IP, TCP, UDP) is greater th elength of the
packet # config enable_decode_oversized_alerts

# Same as above, but drop packet if in Inline mode (requires
enable_decode_oversized_alerts) # config enable_decode_oversized_drops

# Configure IP / TCP checksum mode
config checksum_mode: all

# Configure maximum number of flowbit references.  For more information, see
README.flowbits # config flowbits_size: 64

# Configure ports to ignore
# config ignore_ports: tcp 21 6667:6671 1356 # config ignore_ports: udp 1:17
53

# Configure active response for non inline operation. For more information,
see REAMDE.active # config response: eth0 attempts 2

# Configure DAQ related options for inline operation. For more information,
see README.daq # # config daq: <type> # config daq_dir: <dir> # config
daq_mode: <mode> # config daq_var: <var> # # <type> ::= pcap | afpacket |
dump | nfq | ipq | ipfw # <mode> ::= read-file | passive | inline # <var>
::= arbitrary <name>=<value passed to DAQ # <dir> ::= path as to where to
look for DAQ module so's

# Configure specific UID and GID to run snort as after dropping privs. For
more information see snort -h command line options # # config set_gid:
# config set_uid:

# Configure default snaplen. Snort defaults to MTU of in use interface. For
more information see README # # config snaplen:
#

# Configure default bpf_file to use for filtering what traffic reaches
snort. For more information see snort -h command line options (-F) # #
config bpf_file:
#

# Configure default log directory for snort to log to.  For more information
see snort -h command line options (-l) # # config logdir:


###################################################
# Step #3: Configure the base detection engine.  For more information, see
README.decode ###################################################

# Configure PCRE match limitations
config pcre_match_limit: 3500
config pcre_match_limit_recursion: 1500

# Configure the detection engine  See the Snort Manual, Configuring Snort -
Includes - Config config detection: search-method ac-split search-optimize
max-pattern-len 20

# Configure the event queue.  For more information, see README.event_queue
config event_queue: max_queue 8 log 3 order_events content_length

###################################################
## Configure GTP if it is to be used.
## For more information, see README.GTP
####################################################

# config enable_gtp

###################################################
# Per packet and rule latency enforcement # For more information see
README.ppm ###################################################

# Per Packet latency configuration
#config ppm: max-pkt-time 250, \
#   fastpath-expensive-packets, \
#   pkt-log

# Per Rule latency configuration
#config ppm: max-rule-time 200, \
#   threshold 3, \
#   suspend-expensive-rules, \
#   suspend-timeout 20, \
#   rule-log alert

###################################################
# Configure Perf Profiling for debugging # For more information see
README.PerfProfiling ###################################################

#config profile_rules: print all, sort avg_ticks #config profile_preprocs:
print all, sort avg_ticks

###################################################
# Configure protocol aware flushing
# For more information see README.stream5
###################################################
config paf_max: 16000

###################################################
# Step #4: Configure dynamic loaded libraries.
# For more information, see Snort Manual, Configuring Snort - Dynamic
Modules ###################################################

# path to dynamic preprocessor libraries dynamicpreprocessor directory
/usr/lib64/snort-2.9.3.1_dynamicpreprocessor/

# path to base preprocessor engine
dynamicengine /usr/lib64/snort-2.9.3.1_dynamicengine/libsf_engine.so

# path to dynamic rules libraries
dynamicdetection directory /usr/local/lib/snort_dynamicrules

###################################################
# Step #5: Configure preprocessors
# For more information, see the Snort Manual, Configuring Snort -
Preprocessors ###################################################

# GTP Control Channle Preprocessor. For more information, see README.GTP #
preprocessor gtp: ports { 2123 3386 2152 }

# Inline packet normalization. For more information, see README.normalize #
Does nothing in IDS mode preprocessor normalize_ip4 preprocessor
normalize_tcp: ips ecn stream preprocessor normalize_icmp4 preprocessor
normalize_ip6 preprocessor normalize_icmp6

# Target-based IP defragmentation.  For more inforation, see README.frag3
preprocessor frag3_global: max_frags 65536 preprocessor frag3_engine: policy
windows detect_anomalies overlap_limit 10 min_fragment_length 100 timeout
180

# Target-Based stateful inspection/stream reassembly.  For more inforation,
see README.stream5 preprocessor stream5_global: track_tcp yes, \
   track_udp yes, \
   track_icmp no, \
   max_tcp 262144, \
   max_udp 131072, \
   max_active_responses 2, \
   min_response_seconds 5
preprocessor stream5_tcp: policy windows, detect_anomalies, require_3whs
180, \
   overlap_limit 10, small_segments 3 bytes 150, timeout 180, \
    ports client 21 22 23 25 42 53 79 109 110 111 113 119 135 136 137 139
143 \
        161 445 513 514 587 593 691 1433 1521 2100 3306 6070 6665 6666 6667
6668 6669 \
        7000 8181 32770 32771 32772 32773 32774 32775 32776 32777 32778
32779, \
    ports both 80 81 311 443 465 563 591 593 636 901 989 992 993 994 995
1220 1414 1830 2301 2381 2809 3128 3702 4343 5250 7907 7001 7145 7510 7802
7777 7779 \
        7801 7900 7901 7902 7903 7904 7905 7906 7908 7909 7910 7911 7912
7913 7914 7915 7916 \
        7917 7918 7919 7920 8000 8008 8014 8028 8080 8088 8118 8123 8180
8243 8280 8800 8888 8899 9080 9090 9091 9443 9999 11371 55555 preprocessor
stream5_udp: timeout 180

# performance statistics.  For more information, see the Snort Manual,
Configuring Snort - Preprocessors - Performance Monitor # preprocessor
perfmonitor: time 300 file /var/snort/snort.stats pktcnt 10000

# HTTP normalization and anomaly detection.  For more information, see
README.http_inspect preprocessor http_inspect: global iis_unicode_map
unicode.map 1252 compress_depth 65535 decompress_depth 65535 preprocessor
http_inspect_server: server default \
    http_methods { GET POST PUT SEARCH MKCOL COPY MOVE LOCK UNLOCK NOTIFY
POLL BCOPY BDELETE BMOVE LINK UNLINK OPTIONS HEAD DELETE TRACE TRACK CONNECT
SOURCE SUBSCRIBE UNSUBSCRIBE PROPFIND PROPPATCH BPROPFIND BPROPPATCH
RPC_CONNECT PROXY_SUCCESS BITS_POST CCM_POST SMS_POST RPC_IN_DATA
RPC_OUT_DATA RPC_ECHO_DATA } \
    chunk_length 500000 \
    server_flow_depth 0 \
    client_flow_depth 0 \
    post_depth 65495 \
    oversize_dir_length 500 \
    max_header_length 750 \
    max_headers 100 \
    max_spaces 0 \
    small_chunk_length { 10 5 } \
    ports { 80 81 311 591 593 901 1220 1414 1830 2301 2381 2809 3128 3702
4343 5250 7001 7145 7510 7777 7779 8000 8008 8014 8028 8080 8088 8118 8123
8180 8181 8243 8280 8800 8888 8899 9080 9090 9091 9443 9999 11371 55555 } \
    non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
    enable_cookie \
    extended_response_inspection \
    inspect_gzip \
    normalize_utf \
    unlimited_decompress \
    normalize_javascript \
    apache_whitespace no \
    ascii no \
    bare_byte no \
    directory no \
    double_decode no \
    iis_backslash no \
    iis_delimiter no \
    iis_unicode no \
    multi_slash no \
    utf_8 no \
    u_encode yes \
    webroot no

# ONC-RPC normalization and anomaly detection.  For more information, see
the Snort Manual, Configuring Snort - Preprocessors - RPC Decode
preprocessor rpc_decode: 111 32770 32771 32772 32773 32774 32775 32776 32777
32778 32779 no_alert_multiple_requests no_alert_large_fragments
no_alert_incomplete

# Back Orifice detection.
preprocessor bo

# FTP / Telnet normalization and anomaly detection.  For more information,
see README.ftptelnet preprocessor ftp_telnet: global inspection_type
stateful encrypted_traffic no preprocessor ftp_telnet_protocol: telnet \
    ayt_attack_thresh 20 \
    normalize ports { 23 } \
    detect_anomalies
preprocessor ftp_telnet_protocol: ftp server default \
    def_max_param_len 100 \
    ports { 21 2100 3535 } \
    telnet_cmds yes \
    ignore_telnet_erase_cmds yes \
    ftp_cmds { ABOR ACCT ADAT ALLO APPE AUTH CCC CDUP } \
    ftp_cmds { CEL CLNT CMD CONF CWD DELE ENC EPRT } \
    ftp_cmds { EPSV ESTA ESTP FEAT HELP LANG LIST LPRT } \
    ftp_cmds { LPSV MACB MAIL MDTM MIC MKD MLSD MLST } \
    ftp_cmds { MODE NLST NOOP OPTS PASS PASV PBSZ PORT } \
    ftp_cmds { PROT PWD QUIT REIN REST RETR RMD RNFR } \
    ftp_cmds { RNTO SDUP SITE SIZE SMNT STAT STOR STOU } \
    ftp_cmds { STRU SYST TEST TYPE USER XCUP XCRC XCWD } \
    ftp_cmds { XMAS XMD5 XMKD XPWD XRCP XRMD XRSQ XSEM } \
    ftp_cmds { XSEN XSHA1 XSHA256 } \
    alt_max_param_len 0 { ABOR CCC CDUP ESTA FEAT LPSV NOOP PASV PWD QUIT
REIN STOU SYST XCUP XPWD } \
    alt_max_param_len 200 { ALLO APPE CMD HELP NLST RETR RNFR STOR STOU XMKD
} \
    alt_max_param_len 256 { CWD RNTO } \
    alt_max_param_len 400 { PORT } \
    alt_max_param_len 512 { SIZE } \
    chk_str_fmt { ACCT ADAT ALLO APPE AUTH CEL CLNT CMD } \
    chk_str_fmt { CONF CWD DELE ENC EPRT EPSV ESTP HELP } \
    chk_str_fmt { LANG LIST LPRT MACB MAIL MDTM MIC MKD } \
    chk_str_fmt { MLSD MLST MODE NLST OPTS PASS PBSZ PORT } \
    chk_str_fmt { PROT REST RETR RMD RNFR RNTO SDUP SITE } \
    chk_str_fmt { SIZE SMNT STAT STOR STRU TEST TYPE USER } \
    chk_str_fmt { XCRC XCWD XMAS XMD5 XMKD XRCP XRMD XRSQ } \
    chk_str_fmt { XSEM XSEN XSHA1 XSHA256 } \
    cmd_validity ALLO < int [ char R int ] > \
    cmd_validity EPSV < [ { char 12 | char A char L char L } ] > \
    cmd_validity MACB < string > \
    cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
    cmd_validity MODE < char ASBCZ > \
    cmd_validity PORT < host_port > \
    cmd_validity PROT < char CSEP > \
    cmd_validity STRU < char FRPO [ string ] > \
    cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [ number ]
} > preprocessor ftp_telnet_protocol: ftp client default \
    max_resp_len 256 \
    bounce yes \
    ignore_telnet_erase_cmds yes \
    telnet_cmds yes


# SMTP normalization and anomaly detection.  For more information, see
README.SMTP preprocessor smtp: ports { 25 465 587 691 } \
    inspection_type stateful \
    b64_decode_depth 0 \
    qp_decode_depth 0 \
    bitenc_decode_depth 0 \
    uu_decode_depth 0 \
    log_mailfrom \
    log_rcptto \
    log_filename \
    log_email_hdrs \
    normalize cmds \
    normalize_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND
ESOM ETRN EVFY } \
    normalize_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET
SAML SEND SOML } \
    normalize_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP
X-ERCP X-EXCH50 } \
    normalize_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN
XLICENSE XQUE XSTA XTRN XUSR } \
    max_command_line_len 512 \
    max_header_line_len 1000 \
    max_response_line_len 512 \
    alt_max_command_line_len 260 { MAIL } \
    alt_max_command_line_len 300 { RCPT } \
    alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \
    alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM
ESND ESOM EVFY IDENT NOOP RSET } \
    alt_max_command_line_len 246 { SEND SAML SOML AUTH TURN ETRN DATA RSET
QUIT ONEX QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH
XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \
    valid_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM
ETRN EVFY } \
    valid_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET
SAML SEND SOML } \
    valid_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP
X-ERCP X-EXCH50 } \
    valid_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE
XQUE XSTA XTRN XUSR } \
    xlink2state { enabled }

# Portscan detection.  For more information, see README.sfportscan #
preprocessor sfportscan: proto  { all } memcap { 10000000 } sense_level {
low }

# ARP spoof detection.  For more information, see the Snort Manual -
Configuring Snort - Preprocessors - ARP Spoof Preprocessor # preprocessor
arpspoof # preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00

# SSH anomaly detection.  For more information, see README.ssh preprocessor
ssh: server_ports { 22 } \
                  autodetect \
                  max_client_bytes 19600 \
                  max_encrypted_packets 20 \
                  max_server_version_len 100 \
                  enable_respoverflow enable_ssh1crc32 \
                  enable_srvoverflow enable_protomismatch

# SMB / DCE-RPC normalization and anomaly detection.  For more information,
see README.dcerpc2 preprocessor dcerpc2: memcap 102400, events [co ]
preprocessor dcerpc2_server: default, policy WinXP, \
    detect [smb [139,445], tcp 135, udp 135, rpc-over-http-server 593], \
    autodetect [tcp 1025:, udp 1025:, rpc-over-http-server 1025:], \
    smb_max_chain 3, smb_invalid_shares ["C$", "D$", "ADMIN$"]

# DNS anomaly detection.  For more information, see README.dns preprocessor
dns: ports { 53 } enable_rdata_overflow

# SSL anomaly detection and traffic bypass.  For more information, see
README.ssl preprocessor ssl: ports { 443 465 563 636 989 992 993 994 995
7801 7802 7900 7901 7902 7903 7904 7905 7906 7907 7908 7909 7910 7911 7912
7913 7914 7915 7916 7917 7918 7919 7920 }, trustservers, noinspect_encrypted

# SDF sensitive data preprocessor.  For more information see
README.sensitive_data preprocessor sensitive_data: alert_threshold 25

# SIP Session Initiation Protocol preprocessor.  For more information see
README.sip preprocessor sip: max_sessions 40000, \
   ports { 5060 5061 5600 }, \
   methods { invite \
             cancel \
             ack \
             bye \
             register \
             options \
             refer \
             subscribe \
             update \
             join \
             info \
             message \
             notify \
             benotify \
             do \
             qauth \
             sprack \
             publish \
             service \
             unsubscribe \
             prack }, \
   max_uri_len 512, \
   max_call_id_len 80, \
   max_requestName_len 20, \
   max_from_len 256, \
   max_to_len 256, \
   max_via_len 1024, \
   max_contact_len 512, \
   max_content_len 2048

# IMAP preprocessor.  For more information see README.imap preprocessor
imap: \
   ports { 143 } \
   b64_decode_depth 0 \
   qp_decode_depth 0 \
   bitenc_decode_depth 0 \
   uu_decode_depth 0

# POP preprocessor. For more information see README.pop preprocessor pop: \
   ports { 110 } \
   b64_decode_depth 0 \
   qp_decode_depth 0 \
   bitenc_decode_depth 0 \
   uu_decode_depth 0

# Modbus preprocessor. For more information see README.modbus preprocessor
modbus: ports { 502 }

# DNP3 preprocessor. For more information see README.dnp3 preprocessor dnp3:
ports { 20000 } \
   memcap 262144 \
   check_crc

# Reputation preprocessor. For more information see README.reputation
preprocessor reputation: \
   memcap 500, \
   priority whitelist, \
   nested_ip inner, \
   whitelist $WHITE_LIST_PATH/white_list.rules, \
   blacklist $BLACK_LIST_PATH/black_list.rules

###################################################
# Step #6: Configure output plugins
# For more information, see Snort Manual, Configuring Snort - Output Modules
###################################################

# unified2
# Recommended for most installs
output unified2:filename merged.log, limit 128, nostamp, mpls_event_types,
vlan_event_types

# Additional configuration for specific types of installs # output
alert_unified2: filename snort.alert, limit 128, nostamp # output
log_unified2: filename snort.log, limit 128, nostamp

# syslog
# output alert_syslog: LOG_AUTH LOG_ALERT

# pcap
# output log_tcpdump: tcpdump.log

# metadata reference data.  do not modify these lines include
classification.config include reference.config


###################################################
# Step #7: Customize your rule set
# For more information, see Snort Manual, Writing Snort Rules # # NOTE: All
categories are enabled in this conf file
###################################################

# site specific rules
include $RULE_PATH/local.rules

include $RULE_PATH/attack-responses.rules include $RULE_PATH/backdoor.rules
include $RULE_PATH/bad-traffic.rules include $RULE_PATH/blacklist.rules
include $RULE_PATH/botnet-cnc.rules include $RULE_PATH/chat.rules include
$RULE_PATH/content-replace.rules include $RULE_PATH/ddos.rules include
$RULE_PATH/dns.rules include $RULE_PATH/dos.rules include
$RULE_PATH/exploit.rules include $RULE_PATH/file-identify.rules include
$RULE_PATH/finger.rules include $RULE_PATH/ftp.rules include
$RULE_PATH/icmp.rules include $RULE_PATH/icmp-info.rules include
$RULE_PATH/imap.rules include $RULE_PATH/info.rules include
$RULE_PATH/misc.rules include $RULE_PATH/multimedia.rules include
$RULE_PATH/mysql.rules include $RULE_PATH/netbios.rules include
$RULE_PATH/nntp.rules include $RULE_PATH/oracle.rules include
$RULE_PATH/other-ids.rules include $RULE_PATH/p2p.rules include
$RULE_PATH/phishing-spam.rules include $RULE_PATH/policy.rules include
$RULE_PATH/pop2.rules include $RULE_PATH/pop3.rules include
$RULE_PATH/rpc.rules include $RULE_PATH/rservices.rules include
$RULE_PATH/scada.rules include $RULE_PATH/scan.rules include
$RULE_PATH/shellcode.rules include $RULE_PATH/smtp.rules include
$RULE_PATH/snmp.rules include $RULE_PATH/specific-threats.rules include
$RULE_PATH/spyware-put.rules include $RULE_PATH/sql.rules include
$RULE_PATH/telnet.rules include $RULE_PATH/tftp.rules include
$RULE_PATH/virus.rules include $RULE_PATH/voip.rules include
$RULE_PATH/web-activex.rules include $RULE_PATH/web-attacks.rules include
$RULE_PATH/web-cgi.rules include $RULE_PATH/web-client.rules include
$RULE_PATH/web-coldfusion.rules include $RULE_PATH/web-frontpage.rules
include $RULE_PATH/web-iis.rules include $RULE_PATH/web-misc.rules include
$RULE_PATH/web-php.rules include $RULE_PATH/x11.rules

###################################################
# Step #8: Customize your preprocessor and decoder alerts # For more
information, see README.decoder_preproc_rules
###################################################

# decoder and preprocessor event rules
# include $PREPROC_RULE_PATH/preprocessor.rules
# include $PREPROC_RULE_PATH/decoder.rules # include
$PREPROC_RULE_PATH/sensitive-data.rules

###################################################
# Step #9: Customize your Shared Object Snort Rules # For more information,
see
http://vrt-sourcefire.blogspot.com/2009/01/using-vrt-certified-shared-object
-rules.html
###################################################

# dynamic library rules
# include $SO_RULE_PATH/bad-traffic.rules # include $SO_RULE_PATH/chat.rules
# include $SO_RULE_PATH/dos.rules # include $SO_RULE_PATH/exploit.rules #
include $SO_RULE_PATH/icmp.rules # include $SO_RULE_PATH/imap.rules #
include $SO_RULE_PATH/misc.rules # include $SO_RULE_PATH/multimedia.rules #
include $SO_RULE_PATH/netbios.rules # include $SO_RULE_PATH/nntp.rules #
include $SO_RULE_PATH/p2p.rules # include $SO_RULE_PATH/smtp.rules # include
$SO_RULE_PATH/snmp.rules # include $SO_RULE_PATH/specific-threats.rules
# include $SO_RULE_PATH/web-activex.rules # include
$SO_RULE_PATH/web-client.rules # include $SO_RULE_PATH/web-iis.rules #
include $SO_RULE_PATH/web-misc.rules

# Event thresholding or suppression commands. See threshold.conf include
threshold.conf




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