[people/pmueller/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
#  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
###################################################

include /etc/snort/vars

# Setup the network addresses you are protecting
# taken from /etc/snort vars
#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 
# taken from /etc/snort vars
#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 ssh servers on your network
var SSH_SERVERS $HOME_NET

# List of ports you run web servers on
portvar HTTP_PORTS  [80,311,591,593,901,1220,1414,1830,2301,2381,2809,3128,3702,5250,7001,7777,7779,8000,8008,8028,8080,8088,8118,8123,8180,8243,8280,8888,9090,9091,9443,9999,11371]

# 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 ssh ports
portvar SSH_PORTS  [22,222]
# 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

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

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

# 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: max_tcp 8192, track_tcp yes, track_udp yes, track_icmp no 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 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779, \
    ports both 80 311 443 465 563 591 593 636 901 989 992 993 994 995 1220 1414 1830 2301 2381 2809 3128 3702 5250 6907 7001 7702 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 8028 8080 8088 8118 8123 8180 8243 8280 8888 9090 9091 9443 9999 11371
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 20480 decompress_depth 20480

preprocessor http_inspect_server: server default \
    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 \
    ports { 80 311 591 593 901 1220 1414 1830 2301 2381 2809 3128 3702 5250 7001 7777 7779 8000 8008 8028 8080 8088 8118 8123 8180 8243 8280 8888 9090 9091 9443 9999 11371 } \
    non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
    enable_cookie \
    extended_response_inspection \
    inspect_gzip \
    normalize_utf \
    unlimited_decompress \
    apache_whitespace no \
    ascii no \
    bare_byte no \
    base36 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
reprocessor smtp: ports { 25 465 587 691 } \
    inspection_type stateful \
    enable_mime_decoding \
    max_mime_depth 20480 \
    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 { 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 } \
                  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

# 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

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

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

# 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>

# 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
Commit	Line	Data
767cb737	1	#--------------------------------------------------
75a786b6	2	# http://www.snort.org Snort Ruleset
767cb737 SS	3	# Contact: snort-sigs@lists.sourceforge.net
	4	#--------------------------------------------------
	5	# $Id$
	6	#
	7	###################################################
	8	# This file contains a sample snort configuration.
75a786b6 CS	9	# You should take the following steps to create your own custom configuration:
	10	#
	11	# 1) Set the network variables.
	12	# 2) Configure the decoder
	13	# 3) Configure the base detection engine
	14	# 4) Configure dynamic loaded libraries
	15	# 5) Configure preprocessors
	16	# 6) Configure output plugins
	17	# 7) Customize your rule set
c07e938e CS	18	# 8) Customize preprocessor and decoder rule set
c07e938e CS	19	# 9) Customize shared object rule set
cd1a2927	20	###################################################
767cb737	21
75a786b6 CS	22	###################################################
	23	# Step #1: Set the network variables. For more information, see README.variables
	24	###################################################
	25
8dc25f04 AF	26	include /etc/snort/vars
8dc25f04 AF	27
75a786b6	28	# Setup the network addresses you are protecting
8dc25f04 AF	29	# taken from /etc/snort vars
8dc25f04 AF	30	#var HOME_NET any
767cb737	31
75a786b6	32	# Set up the external network addresses. A good start may be "any"
767cb737 SS	33	var EXTERNAL_NET any
767cb737 SS	34
767cb737	35	# List of DNS servers on your network
8dc25f04 AF	36	# taken from /etc/snort vars
8dc25f04 AF	37	#var DNS_SERVERS $HOME_NET
767cb737 SS	38
	39	# List of SMTP servers on your network
	40	var SMTP_SERVERS $HOME_NET
	41
	42	# List of web servers on your network
	43	var HTTP_SERVERS $HOME_NET
	44
	45	# List of sql servers on your network
	46	var SQL_SERVERS $HOME_NET
	47
	48	# List of telnet servers on your network
	49	var TELNET_SERVERS $HOME_NET
	50
c07e938e CS	51	# List of ssh servers on your network
c07e938e CS	52	var SSH_SERVERS $HOME_NET
767cb737	53
c07e938e CS	54	# List of ports you run web servers on
c07e938e CS	55	portvar HTTP_PORTS [80,311,591,593,901,1220,1414,1830,2301,2381,2809,3128,3702,5250,7001,7777,7779,8000,8008,8028,8080,8088,8118,8123,8180,8243,8280,8888,9090,9091,9443,9999,11371]
8dc25f04	56
75a786b6	57	# List of ports you want to look for SHELLCODE on.
767cb737 SS	58	portvar SHELLCODE_PORTS !80
767cb737 SS	59
75a786b6	60	# List of ports you might see oracle attacks on
c07e938e CS	61	portvar ORACLE_PORTS 1024:
	62	# List of ssh ports
	63	portvar SSH_PORTS [22,222]
75a786b6	64	# other variables, these should not be modified
767cb737 SS	65	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]
	66
	67	# Path to your rules files (this can be a relative path)
	68	# Note for Windows users: You are advised to make this an absolute path,
	69	# such as: c:\snort\rules
	70	var RULE_PATH /etc/snort/rules
75a786b6	71	var SO_RULE_PATH /etc/snort/so_rules
767cb737 SS	72	var PREPROC_RULE_PATH /etc/snort/preproc_rules
767cb737 SS	73
75a786b6 CS	74	###################################################
	75	# Step #2: Configure the decoder. For more information, see README.decode
	76	###################################################
	77
767cb737	78	# Stop generic decode events:
f9866a72	79	config disable_decode_alerts
75a786b6	80
767cb737	81	# Stop Alerts on experimental TCP options
75a786b6 CS	82	config disable_tcpopt_experimental_alerts
75a786b6 CS	83
767cb737	84	# Stop Alerts on obsolete TCP options
75a786b6 CS	85	config disable_tcpopt_obsolete_alerts
75a786b6 CS	86
767cb737	87	# Stop Alerts on T/TCP alerts
75a786b6 CS	88	#config disable_tcpopt_ttcp_alerts
75a786b6 CS	89
767cb737	90	# Stop Alerts on all other TCPOption type events:
f9866a72	91	config disable_tcpopt_alerts
75a786b6	92
767cb737	93	# Stop Alerts on invalid ip options
75a786b6 CS	94	#config disable_ipopt_alerts
	95
	96	# Alert if value in length field (IP, TCP, UDP) is greater th elength of the packet
767cb737	97	# config enable_decode_oversized_alerts
75a786b6 CS	98
75a786b6 CS	99	# Same as above, but drop packet if in Inline mode (requires enable_decode_oversized_alerts)
767cb737	100	# config enable_decode_oversized_drops
767cb737	101
75a786b6 CS	102	# Configure IP / TCP checksum mode
	103	config checksum_mode: all
	104
	105	# Configure maximum number of flowbit references. For more information, see README.flowbits
	106	# config flowbits_size: 64
	107
	108	# Configure ports to ignore
	109	# config ignore_ports: tcp 21 6667:6671 1356
	110	# config ignore_ports: udp 1:17 53
	111
c07e938e CS	112	# Configure active response for non inline operation. For more information, see REAMDE.active
c07e938e CS	113	# config response: eth0 attempts 2
75a786b6 CS	114	###################################################
	115	# Step #3: Configure the base detection engine. For more information, see README.decode
	116	###################################################
	117
	118	# Configure PCRE match limitations
c07e938e	119	config pcre_match_limit: 3500
75a786b6 CS	120	config pcre_match_limit_recursion: 1500
	121
	122	# Configure the detection engine See the Snort Manual, Configuring Snort - Includes - Config
c07e938e	123	config detection: search-method ac-split search-optimize max-pattern-len 20
75a786b6 CS	124
	125	# Configure the event queue. For more information, see README.event_queue
	126	config event_queue: max_queue 8 log 3 order_events content_length
	127
c07e938e CS	128	###################################################
	129	# Per packet and rule latency enforcement
	130	# For more information see README.ppm
	131	###################################################
	132
	133	# Per Packet latency configuration
	134	#config ppm: max-pkt-time 250, \
	135	# fastpath-expensive-packets, \
	136	# pkt-log
	137
	138	# Per Rule latency configuration
	139	#config ppm: max-rule-time 200, \
	140	# threshold 3, \
	141	# suspend-expensive-rules, \
	142	# suspend-timeout 20, \
	143	# rule-log alert
767cb737	144
c07e938e CS	145	###################################################
	146	# Configure Perf Profiling for debugging
	147	# For more information see README.PerfProfiling
	148	###################################################
75a786b6	149
c07e938e CS	150	#config profile_rules: print all, sort avg_ticks
c07e938e CS	151	#config profile_preprocs: print all, sort avg_ticks
cd1a2927	152	###################################################
75a786b6 CS	153	# Step #4: Configure dynamic loaded libraries.
	154	# For more information, see Snort Manual, Configuring Snort - Dynamic Modules
	155	###################################################
	156
	157	# path to dynamic preprocessor libraries
4fba936c	158	dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
75a786b6 CS	159
75a786b6 CS	160	# path to base preprocessor engine
767cb737	161	dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
cd1a2927	162
75a786b6 CS	163	# path to dynamic rules libraries
75a786b6 CS	164	# dynamicdetection directory /usr/lib/snort_dynamicrules
767cb737	165
75a786b6 CS	166	###################################################
	167	# Step #5: Configure preprocessors
	168	# For more information, see the Snort Manual, Configuring Snort - Preprocessors
	169	###################################################
	170
c07e938e CS	171	# Inline packet normalization. For more information, see README.normalize
	172	# Does nothing in IDS mode
	173	preprocessor normalize_ip4
	174	preprocessor normalize_tcp: ips ecn stream
	175	preprocessor normalize_icmp4
	176	preprocessor normalize_ip6
	177	preprocessor normalize_icmp6
	178
75a786b6 CS	179	# Target-based IP defragmentation. For more inforation, see README.frag3
75a786b6 CS	180	preprocessor frag3_global: max_frags 65536
c07e938e	181	preprocessor frag3_engine: policy windows detect_anomalies overlap_limit 10 min_fragment_length 100 timeout 180
767cb737	182
75a786b6	183	# Target-Based stateful inspection/stream reassembly. For more inforation, see README.stream5
c07e938e CS	184	preprocessor stream5_global: max_tcp 8192, track_tcp yes, track_udp yes, track_icmp no max_active_responses 2 min_response_seconds 5
	185
	186	preprocessor stream5_tcp: policy windows, detect_anomalies, require_3whs 180, \
	187	overlap_limit 10, small_segments 3 bytes 150, timeout 180, \
	188	ports client 21 22 23 25 42 53 79 109 110 111 113 119 135 136 137 139 143 \
	189	161 445 513 514 587 593 691 1433 1521 2100 3306 6070 6665 6666 6667 6668 6669 \
	190	7000 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779, \
	191	ports both 80 311 443 465 563 591 593 636 901 989 992 993 994 995 1220 1414 1830 2301 2381 2809 3128 3702 5250 6907 7001 7702 7777 7779 \
	192	7801 7900 7901 7902 7903 7904 7905 7906 7908 7909 7910 7911 7912 7913 7914 7915 7916 \
	193	7917 7918 7919 7920 8000 8008 8028 8080 8088 8118 8123 8180 8243 8280 8888 9090 9091 9443 9999 11371
	194	preprocessor stream5_udp: timeout 180
75a786b6 CS	195
	196	# performance statistics. For more information, see the Snort Manual, Configuring Snort - Preprocessors - Performance Monitor
	197	# preprocessor perfmonitor: time 300 file /var/snort/snort.stats pktcnt 10000
767cb737	198
75a786b6	199	# HTTP normalization and anomaly detection. For more information, see README.http_inspect
c07e938e	200	preprocessor http_inspect: global iis_unicode_map unicode.map 1252 compress_depth 20480 decompress_depth 20480
75a786b6 CS	201
75a786b6 CS	202	preprocessor http_inspect_server: server default \
c07e938e CS	203	chunk_length 500000 \
	204	server_flow_depth 0 \
	205	client_flow_depth 0 \
	206	post_depth 65495 \
	207	oversize_dir_length 500 \
	208	max_header_length 750 \
	209	max_headers 100 \
	210	ports { 80 311 591 593 901 1220 1414 1830 2301 2381 2809 3128 3702 5250 7001 7777 7779 8000 8008 8028 8080 8088 8118 8123 8180 8243 8280 8888 9090 9091 9443 9999 11371 } \
	211	non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
	212	enable_cookie \
	213	extended_response_inspection \
	214	inspect_gzip \
	215	normalize_utf \
	216	unlimited_decompress \
75a786b6 CS	217	apache_whitespace no \
75a786b6 CS	218	ascii no \
c07e938e CS	219	bare_byte no \
	220	base36 no \
	221	directory no \
	222	double_decode no \
	223	iis_backslash no \
	224	iis_delimiter no \
	225	iis_unicode no \
	226	multi_slash no \
	227	utf_8 no \
	228	u_encode yes \
	229	webroot no
75a786b6 CS	230
	231	# ONC-RPC normalization and anomaly detection. For more information, see the Snort Manual, Configuring Snort - Preprocessors - RPC Decode
	232	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
	233
	234	# Back Orifice detection.
	235	preprocessor bo
	236
	237	# FTP / Telnet normalization and anomaly detection. For more information, see README.ftptelnet
c07e938e CS	238	preprocessor ftp_telnet: global inspection_type stateful encrypted_traffic no
c07e938e CS	239
4fba936c	240	preprocessor ftp_telnet_protocol: telnet \
75a786b6 CS	241	ayt_attack_thresh 20 \
	242	normalize ports { 23 } \
	243	detect_anomalies
c07e938e	244
4fba936c	245	preprocessor ftp_telnet_protocol: ftp server default \
75a786b6	246	def_max_param_len 100 \
c07e938e CS	247	ports { 21 2100 3535 } \
	248	telnet_cmds yes \
	249	ignore_telnet_erase_cmds yes \
	250	ftp_cmds { ABOR ACCT ADAT ALLO APPE AUTH CCC CDUP } \
	251	ftp_cmds { CEL CLNT CMD CONF CWD DELE ENC EPRT } \
	252	ftp_cmds { EPSV ESTA ESTP FEAT HELP LANG LIST LPRT } \
	253	ftp_cmds { LPSV MACB MAIL MDTM MIC MKD MLSD MLST } \
	254	ftp_cmds { MODE NLST NOOP OPTS PASS PASV PBSZ PORT } \
	255	ftp_cmds { PROT PWD QUIT REIN REST RETR RMD RNFR } \
	256	ftp_cmds { RNTO SDUP SITE SIZE SMNT STAT STOR STOU } \
	257	ftp_cmds { STRU SYST TEST TYPE USER XCUP XCRC XCWD } \
	258	ftp_cmds { XMAS XMD5 XMKD XPWD XRCP XRMD XRSQ XSEM } \
	259	ftp_cmds { XSEN XSHA1 XSHA256 } \
	260	alt_max_param_len 0 { ABOR CCC CDUP ESTA FEAT LPSV NOOP PASV PWD QUIT REIN STOU SYST XCUP XPWD } \
	261	alt_max_param_len 200 { ALLO APPE CMD HELP NLST RETR RNFR STOR STOU XMKD } \
	262	alt_max_param_len 256 { CWD RNTO } \
75a786b6 CS	263	alt_max_param_len 400 { PORT } \
75a786b6 CS	264	alt_max_param_len 512 { SIZE } \
c07e938e CS	265	chk_str_fmt { ACCT ADAT ALLO APPE AUTH CEL CLNT CMD } \
	266	chk_str_fmt { CONF CWD DELE ENC EPRT EPSV ESTP HELP } \
	267	chk_str_fmt { LANG LIST LPRT MACB MAIL MDTM MIC MKD } \
	268	chk_str_fmt { MLSD MLST MODE NLST OPTS PASS PBSZ PORT } \
	269	chk_str_fmt { PROT REST RETR RMD RNFR RNTO SDUP SITE } \
	270	chk_str_fmt { SIZE SMNT STAT STOR STRU TEST TYPE USER } \
	271	chk_str_fmt { XCRC XCWD XMAS XMD5 XMKD XRCP XRMD XRSQ } \
	272	chk_str_fmt { XSEM XSEN XSHA1 XSHA256 } \
	273	cmd_validity ALLO < int [ char R int ] > \
	274	cmd_validity EPSV < [ { char 12 \| char A char L char L } ] > \
	275	cmd_validity MACB < string > \
75a786b6	276	cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
c07e938e CS	277	cmd_validity MODE < char ASBCZ > \
	278	cmd_validity PORT < host_port > \
	279	cmd_validity PROT < char CSEP > \
	280	cmd_validity STRU < char FRPO [ string ] > \
	281	cmd_validity TYPE < { char AE [ char NTC ] \| char I \| char L [ number ] } >
	282
4fba936c	283	preprocessor ftp_telnet_protocol: ftp client default \
75a786b6 CS	284	max_resp_len 256 \
75a786b6 CS	285	bounce yes \
c07e938e CS	286	ignore_telnet_erase_cmds yes \
c07e938e CS	287	telnet_cmds yes
767cb737	288
75a786b6	289	# SMTP normalization and anomaly detection. For more information, see README.SMTP
c07e938e CS	290	reprocessor smtp: ports { 25 465 587 691 } \
	291	inspection_type stateful \
	292	enable_mime_decoding \
	293	max_mime_depth 20480 \
	294	normalize cmds \
	295	normalize_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM ETRN EVFY } \
	296	normalize_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET SAML SEND SOML } \
	297	normalize_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP X-ERCP X-EXCH50 } \
	298	normalize_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \
	299	max_command_line_len 512 \
	300	max_header_line_len 1000 \
	301	max_response_line_len 512 \
	302	alt_max_command_line_len 260 { MAIL } \
	303	alt_max_command_line_len 300 { RCPT } \
	304	alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \
	305	alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET } \
	306	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 } \
	307	valid_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM ETRN EVFY } \
	308	valid_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET SAML SEND SOML } \
	309	valid_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP X-ERCP X-EXCH50 } \
	310	valid_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \
	311	xlink2state { enabled }
767cb737	312
75a786b6 CS	313	# Portscan detection. For more information, see README.sfportscan
75a786b6 CS	314	preprocessor sfportscan: proto { all } memcap { 10000000 } sense_level { medium }
767cb737	315
75a786b6 CS	316	# ARP spoof detection. For more information, see the Snort Manual - Configuring Snort - Preprocessors - ARP Spoof Preprocessor
	317	# preprocessor arpspoof
	318	# preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00
8581d1ef	319
75a786b6 CS	320	# SSH anomaly detection. For more information, see README.ssh
75a786b6 CS	321	preprocessor ssh: server_ports { 22 222 } \
c07e938e	322	autodetect \
75a786b6 CS	323	max_client_bytes 19600 \
75a786b6 CS	324	max_encrypted_packets 20 \
c07e938e	325	max_server_version_len 100 \
75a786b6 CS	326	enable_respoverflow enable_ssh1crc32 \
75a786b6 CS	327	enable_srvoverflow enable_protomismatch
8581d1ef	328
75a786b6 CS	329	# SMB / DCE-RPC normalization and anomaly detection. For more information, see README.dcerpc2
	330	preprocessor dcerpc2: memcap 102400, events [co ]
	331	preprocessor dcerpc2_server: default, policy WinXP, \
	332	detect [smb [139,445], tcp 135, udp 135, rpc-over-http-server 593], \
	333	autodetect [tcp 1025:, udp 1025:, rpc-over-http-server 1025:], \
	334	smb_max_chain 3
767cb737	335
75a786b6 CS	336	# DNS anomaly detection. For more information, see README.dns
75a786b6 CS	337	preprocessor dns: ports { 53 } enable_rdata_overflow
767cb737	338
75a786b6 CS	339	# SSL anomaly detection and traffic bypass. For more information, see README.ssl
75a786b6 CS	340	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
767cb737	341
c07e938e CS	342	# SDF sensitive data preprocessor. For more information see README.sensitive_data
c07e938e CS	343	preprocessor sensitive_data: alert_threshold 25
767cb737	344
75a786b6 CS	345	###################################################
	346	# Step #6: Configure output plugins
	347	# For more information, see Snort Manual, Configuring Snort - Output Modules
	348	###################################################
767cb737	349
c07e938e CS	350	# unified2
	351	# Recommended for most installs
	352	# output unified2: filename merged.log, limit 128, nostamp, mpls_event_types, vlan_event_types
	353
	354	# Additional configuration for specific types of installs
	355	# output alert_unified2: filename snort.alert, limit 128, nostamp
	356	# output log_unified2: filename snort.log, limit 128, nostamp
75a786b6	357	# syslog
767cb737	358	# output alert_syslog: LOG_AUTH LOG_ALERT
767cb737	359
75a786b6	360	# pcap
767cb737 SS	361	# output log_tcpdump: tcpdump.log
767cb737 SS	362
75a786b6 CS	363	# database
	364	# output database: alert, <db_type>, user=<username> password=<password> test dbname=<name> host=<hostname>
	365	# output database: log, <db_type>, user=<username> password=<password> test dbname=<name> host=<hostname>
	366
75a786b6	367	# prelude
767cb737	368	# output alert_prelude
767cb737	369
75a786b6	370	# metadata reference data. do not modify these lines
767cb737	371	include /etc/snort/rules/classification.config
767cb737 SS	372	include /etc/snort/rules/reference.config
767cb737 SS	373
767cb737	374
75a786b6 CS	375	###################################################
	376	# Step #7: Customize your rule set
	377	# For more information, see Snort Manual, Writing Snort Rules
	378	###################################################
767cb737	379
75a786b6	380	# site specific rules
75a786b6	381