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[ipfire-2.x.git] / config / snort / snort.conf

#--------------------------------------------------
#   http://www.snort.org     Snort Ruleset
#     Contact: snort-sigs@lists.sourceforge.net
#--------------------------------------------------
# $Id$
#
###################################################
# 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
###################################################

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

# Setup the network addresses you are protecting
var HOME_NET any

# Set up the external network addresses.  A good start may be "any"
var EXTERNAL_NET any

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

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

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

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

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

# List of ports you run web servers on
portvar HTTP_PORTS  [80,2301,3128,7777,7779,8000,8008,8028,8080,8180,8888,9999]

# 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 1521

# other variables, these should not be modified
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]

# 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

###################################################
# 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


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

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

# Configure the detection engine  See the Snort Manual, Configuring Snort - Includes - Config
config detection: search-method ac-bnfa max_queue_events 5

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

# Configure Inline Resets.  See README.INLINE
# config layer2resets: 00:06:76:DD:5F:E3


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

# path to dynamic preprocessor libraries
dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/

# path to base preprocessor engine
dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so










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

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

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

# Target-Based stateful inspection/stream reassembly.  For more inforation, see README.stream5
preprocessor stream5_global: max_tcp 8192, track_tcp yes, track_udp no
preprocessor stream5_tcp: policy windows, use_static_footprint_sizes, 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

# 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 

preprocessor http_inspect_server: server default \
    apache_whitespace no \
    ascii no \
	bare_byte no \
	chunk_length 500000 \
	flow_depth 1460 \
	directory no \
	double_decode no \
	iis_backslash no \
	iis_delimiter no \
	iis_unicode no \
	multi_slash no \
	non_strict \
	oversize_dir_length 500 \
	ports { 80 2301 3128 7777 7779 8000 8008 8028 8080 8180 8888 9999 } \
	u_encode yes \
	non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
	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 encrypted_traffic yes check_encrypted inspection_type stateful 
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 } \
    ftp_cmds { USER PASS ACCT CWD SDUP SMNT QUIT REIN PORT PASV TYPE STRU MODE } \
    ftp_cmds { RETR STOR STOU APPE ALLO REST RNFR RNTO ABOR DELE RMD MKD PWD } \
    ftp_cmds { LIST NLST SITE SYST STAT HELP NOOP } \
    ftp_cmds { AUTH ADAT PROT PBSZ CONF ENC } \
    ftp_cmds { FEAT OPTS CEL CMD MACB } \
    ftp_cmds { MDTM REST SIZE MLST MLSD } \
    ftp_cmds { XPWD XCWD XCUP XMKD XRMD TEST CLNT } \
    alt_max_param_len 0 { CDUP QUIT REIN PASV STOU ABOR PWD SYST NOOP } \
    alt_max_param_len 100 { MDTM CEL XCWD SITE USER PASS REST DELE RMD SYST TEST STAT MACB EPSV CLNT LPRT } \
    alt_max_param_len 200 { XMKD NLST ALLO STOU APPE RETR STOR CMD RNFR HELP } \
    alt_max_param_len 256 { RNTO CWD } \ 
    alt_max_param_len 400 { PORT } \
    alt_max_param_len 512 { SIZE } \
    chk_str_fmt { USER PASS ACCT CWD SDUP SMNT PORT TYPE STRU MODE } \
    chk_str_fmt { RETR STOR STOU APPE ALLO REST RNFR RNTO DELE RMD MKD } \
    chk_str_fmt { LIST NLST SITE SYST STAT HELP } \
    chk_str_fmt { AUTH ADAT PROT PBSZ CONF ENC } \
    chk_str_fmt { FEAT OPTS CEL CMD } \
    chk_str_fmt { MDTM REST SIZE MLST MLSD } \
    chk_str_fmt { XPWD XCWD XCUP XMKD XRMD TEST CLNT } \
    cmd_validity MODE < char ASBCZ > \
    cmd_validity STRU < char FRP > \
    cmd_validity ALLO < int [ char R int ] > \
    cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [ number ] } > \
    cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
    cmd_validity PORT < host_port >
preprocessor ftp_telnet_protocol: ftp client default \
    max_resp_len 256 \
    bounce yes \
    telnet_cmds no


# SMTP normalization and anomaly detection.  For more information, see README.SMTP
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 }

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

# 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 { 22 222 } \
                  max_client_bytes 19600 \
                  max_encrypted_packets 20 \
                  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

# 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 { 443 444 465 563 636 989 992 993 994 995 7801 7702 7900 7901 7902 7903 7904 7905 7906 6907 7908 7909 7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 }, trustservers, noinspect_encrypted


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

# syslog
# output alert_syslog: LOG_AUTH LOG_ALERT

# pcap
# output log_tcpdump: tcpdump.log

# database
# output database: alert, <db_type>, user=<username> password=<password> test dbname=<name> host=<hostname>
# output database: log, <db_type>, user=<username> password=<password> test dbname=<name> host=<hostname>

# unified 
# output alert_unified: filename snort.alert, limit 128
# output log_unified: filename snort.log, limit 128

# prelude
# output alert_prelude

# metadata reference data.  do not modify these lines
include /etc/snort/rules/classification.config
include /etc/snort/rules/reference.config


###################################################
# Step #7: Customize your rule set
# For more information, see Snort Manual, Writing Snort Rules
###################################################

# site specific rules

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