Speed issue due to log size too big SOLUTION

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Speed issue due to log size too big SOLUTION

user8446
Administrator
There is a known bug that when the IPS logs get too big, it slows snort down and your throughput suffers. For some reason, snort also was ignoring the 1mb log size limit in the config. A workaround has been to clear the logs manually or weekly via a cron job which works but you loose your log if you don't manually save it. After testing, snort is recognizing kb limits though. When it hits the limit it saves it in /tmp/snort and starts a new log. I'm currently using 80K with no speed loss and that should be about 5-7 days. So in your GUI go to services>intrusion prevention>snort config and the bottom lines should be:

...snip...

output alert_fast: <your alert file depending on mode>.fast 80K
# output log_tcpdump: tcpdump.log

include classification.config
include reference.config

include reference.config

include $RULE_PATH/local.rules
include $RULE_PATH/snort.rules
#include $PREPROC_RULE_PATH/preprocessor.rules
#include $PREPROC_RULE_PATH/decoder.rules
#include $PREPROC_RULE_PATH/sensitive-data.rules
# include $SO_RULE_PATH/so1.rules
# include $SO_RULE_PATH/so2-misc.rules

include threshold.conf

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

Another recommendation as shown above is to comment out include $PREPROC_RULE_PATH/sensitive-data.rules. It generated a lot of false positives and spams the log. It's mainly for data leak detection in businesses such as SS#'s, email address, credit cards, etc. They are alerts and not drops anyway. Your choice.
Running in bridge mode, 1.51 SP1 fw
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Re: Speed issue due to log size too big SOLUTION

Wisiwyg
Thank you! Will give this a try.

I continue to have Snort halt and restart one or more times during a 24 hr period, even with forcing a reboot each night to clear everything.

I note that

include reference.config

is repeated in the file in my snort.config and above .... immediately after itself. Is this on purpose?
Shield Pro v1, Chaos Calmer, FW 1.51 SP1, v8.3.2, Bridge Mode
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Re: Speed issue due to log size too big SOLUTION

Hans
Administrator
/etc/snort/reference.config sets variables only - no harm if it referred multiple times.

[email protected]:/etc/snort# cat reference.config
# $Id$
# The following defines URLs for the references found in the rules
#
# config reference: system URL

config reference: bugtraq   http://www.securityfocus.com/bid/
config reference: cve       http://cve.mitre.org/cgi-bin/cvename.cgi?name=
config reference: arachNIDS http://www.whitehats.com/info/IDS
config reference: osvdb     http://osvdb.org/show/osvdb/

# Note, this one needs a suffix as well.... lets add that in a bit.
config reference: McAfee    http://vil.nai.com/vil/content/v_
config reference: nessus    http://cgi.nessus.org/plugins/dump.php3?id=
config reference: url       http://
config reference: msb       http://technet.microsoft.com/en-us/security/bulletin/
Using Shield Pro v1, Chaos Calmer, FW 1.51 SP1, Bridge Mode

2nd Shield as Sandbox, Chaos Calmer, FW 1.51 SP1 + hotfixes
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Re: Speed issue due to log size too big SOLUTION

Ronniem1
In reply to this post by user8446
Hi there -

  I'm a bit confused on what exactly to add or remove..  I was wondering if you can explain a bit more for me?  Currently under Services -> Intrusion Prevention -> I see Snort7 Config and I see Snort8 Config..  

Under Snort7 config:
output alert_fast: alert.fast
# output log_tcpdump: tcpdump.log

include classification.config
include reference.config

include reference.config

var RULE_PATH /etc/snort/rules/
var PREPROC_RULE_PATH /etc/snort/rules/
var BLACK_LIST_PATH /etc/snort/rules/

include $RULE_PATH/local.rules
include $RULE_PATH/snort.rules
#include $PREPROC_RULE_PATH/preprocessor.rules
include $PREPROC_RULE_PATH/decoder.rules
include $PREPROC_RULE_PATH/sensitive-data.rules

include threshold.conf

ipvar HOME_NET any
ipvar EXTERNAL_NET any
ipvar DNS_SERVERS $HOME_NET
ipvar SMTP_SERVERS $HOME_NET
ipvar HTTP_SERVERS $HOME_NET
ipvar SQL_SERVERS [192.168.0.0/16,10.0.0.0/8,172.16.0.0/12]
ipvar TELNET_SERVERS $HOME_NET
ipvar SSH_SERVERS $HOME_NET
ipvar FTP_SERVERS $HOME_NET
ipvar SIP_SERVERS $HOME_NET
portvar HTTP_PORTS [36,80,81,82,83,84,85,86,87,88,89,90,311,383,555,591,593,631,801,808,818,901,972,1158,1220,1414,1533,1741,1830,1942,2231,2301,2381,2809,2980,3029,3037,3057,3128,3443,3702,4000,4343,4848,5000,5117,5250,5600,6080,6173,6988,7000,7001,7071,7144,7145,7510,7770,7777,7778,7779,8000,8008,8014,8028,8080,8081,8082,8085,8088,8090,8118,8123,8180,8181,8222,8243,8280,8300,8333,8344,8500,8509,8800,8888,8899,8983,9000,9060,9080,9090,9091,9111,9290,9443,9999,10000,11371,12601,13014,15489,29991,33300,34412,34443,34444,41080,44449,50000,50002,51423,53331,55252,55555,56712]
portvar SHELLCODE_PORTS !0
portvar ORACLE_PORTS 1024:
portvar SSH_PORTS 22
portvar FTP_PORTS [21,2100,3535]
portvar SIP_PORTS [5060,5061,5600]
portvar FILE_DATA_PORTS [$HTTP_PORTS,110,143]
portvar GTP_PORTS [2123,2152,3386]

ipvar AIM_SERVERS [64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24]

config enable_decode_drops
config enable_tcpopt_experimental_drops
config enable_tcpopt_obsolete_drops
config enable_tcpopt_ttcp_drops
config enable_tcpopt_drops
config enable_ipopt_drops
config enable_decode_oversized_drops

config policy_mode:inline
config checksum_drop: all
#config checksum_mode: all
# config flowbits_size: 64
# config ignore_ports: tcp 21 6667:6671 1356
# config ignore_ports: udp 1:17 53
# config response: eth0 attempts 2

config daq: nfq
config daq_dir: /usr/lib/daq/
config daq_mode: inline
config daq_var: queue=7
#config daq_var: proto=ip6
#config daq_var: queue_len=65535

# config set_gid:
# config set_uid:

# config snaplen:
# config bpf_file:

config logdir: /tmp/snort/


config pcre_match_limit: 5000
config pcre_match_limit_recursion: 2500
config detection: search-method ac search-optimize max-pattern-len 20
config event_queue: max_queue 8 log 5 order_events content_length

# config enable_gtp

#config ppm: max-pkt-time 250, \
#   fastpath-expensive-packets, \
#   pkt-log

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

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

config paf_max: 16000

dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
#dynamicdetection directory /usr/local/lib/snort_dynamicrules


# preprocessor gtp: ports { 2123 3386 2152 }

preprocessor normalize_ip4
preprocessor normalize_tcp: ips ecn stream
preprocessor normalize_icmp4
preprocessor normalize_ip6
preprocessor normalize_icmp6

preprocessor frag3_global: max_frags 65536
preprocessor frag3_engine: policy windows detect_anomalies overlap_limit 10 min_fragment_length 100 timeout 180

preprocessor stream5_global: track_tcp yes, \
   track_udp yes, \
   track_icmp yes, \
   max_tcp 10000, \
   max_udp 10000, \
   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 70 79 109 110 111 113 119 135 136 137 139 143 \
        161 445 513 514 587 593 691 1433 1521 1741 2100 3306 6070 6665 6666 6667 6668 6669 \
        7000 8181 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779, \
    ports both 36 80 81 82 83 84 85 86 87 88 89 90 110 311 383 443 465 563 555 591 593 631 636 801 808 818 901 972 989 992 993 994 995 1158 1220 1414 1533 1741 1830 1942 2231 2301 2381 2809 2980 3029 3037 3057 3128 3443 3702 4000 4343 4848 5000 5117 5250 5600 6080 6173 6988 7907 7000 7001 7071 7144 7145 7510 7802 7770 7777 7778 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 8081 8082 8085 8088 8090 8118 8123 8180 8181 8222 8243 8280 8300 8333 8344 8500 8509 8800 8888 8899 8983 9000 9060 9080 9090 9091 9111 9290 9443 9999 10000 11371 12601 13014 15489 29991 33300 34412 34443 34444 41080 44449 50000 50002 51423 53331 55252 55555 56712
preprocessor stream5_udp: timeout 180

# preprocessor perfmonitor: time 300 file /var/snort/snort.stats pktcnt 10000

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 200 \
    small_chunk_length { 10 5 } \
    ports { 36 80 81 82 83 84 85 86 87 88 89 90 311 383 555 591 593 631 801 808 818 901 972 1158 1220 1414 1533 1741 1830 1942 2231 2301 2381 2809 2980 3029 3037 3057 3128 3443 3702 4000 4343 4848 5000 5117 5250 5600 6080 6173 6988 7000 7001 7071 7144 7145 7510 7770 7777 7778 7779 8000 8008 8014 8028 8080 8081 8082 8085 8088 8090 8118 8123 8180 8181 8222 8243 8280 8300 8333 8344 8500 8509 8800 8888 8899 8983 9000 9060 9080 9090 9091 9111 9290 9443 9999 10000 11371 12601 13014 15489 29991 33300 34412 34443 34444 41080 44449 50000 50002 51423 53331 55252 55555 56712 } \
    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

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

preprocessor bo

preprocessor ftp_telnet: global inspection_type stateful encrypted_traffic no check_encrypted
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

#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 }

preprocessor sfportscan: proto  { all } memcap { 500000 } sense_level { medium }

# preprocessor arpspoof
# preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00

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

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$"]

preprocessor dns: ports { 53 } enable_rdata_overflow

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

preprocessor sensitive_data: alert_threshold 25

preprocessor sip: max_sessions 1024, \
   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

#preprocessor imap: \
#   ports { 143 } \
#   b64_decode_depth 0 \
#   qp_decode_depth 0 \
#   bitenc_decode_depth 0 \
#   uu_decode_depth 0

#preprocessor pop: \
#   ports { 110 } \
#   b64_decode_depth 0 \
#   qp_decode_depth 0 \
#   bitenc_decode_depth 0 \
#   uu_decode_depth 0

#preprocessor modbus: ports { 502 }

#preprocessor dnp3: ports { 20000 } \
#   memcap 131077 \
#   check_crc

#preprocessor reputation: \
#   memcap 100, \
#   priority whitelist, \
#   nested_ip inner, \
#   whitelist $WHITE_LIST_PATH/white_list.rules, \
#   blacklist $BLACK_LIST_PATH/L2.blacklist


# output unified2: filename merged.log, limit 128, nostamp, mpls_event_types, vlan_event_types
# output alert_unified2: filename snort.alert, limit 128, nostamp
# output log_unified2: filename snort.log, limit 128, nostamp





Under Snort8 Config:

output alert_fast: alert.fast
# output log_tcpdump: tcpdump.log

include classification.config
include reference.config

include reference.config

var RULE_PATH /etc/snort/rules/
var PREPROC_RULE_PATH /etc/snort/rules/
var BLACK_LIST_PATH /etc/snort/rules/

include $RULE_PATH/local.rules
include $RULE_PATH/snort.rules
#include $PREPROC_RULE_PATH/preprocessor.rules
include $PREPROC_RULE_PATH/decoder.rules
include $PREPROC_RULE_PATH/sensitive-data.rules

include threshold.conf

ipvar HOME_NET any
ipvar EXTERNAL_NET any
ipvar DNS_SERVERS $HOME_NET
ipvar SMTP_SERVERS $HOME_NET
ipvar HTTP_SERVERS $HOME_NET
ipvar SQL_SERVERS [192.168.0.0/16,10.0.0.0/8,172.16.0.0/12]
ipvar TELNET_SERVERS $HOME_NET
ipvar SSH_SERVERS $HOME_NET
ipvar FTP_SERVERS $HOME_NET
ipvar SIP_SERVERS $HOME_NET
portvar HTTP_PORTS [36,80,81,82,83,84,85,86,87,88,89,90,311,383,555,591,593,631,801,808,818,901,972,1158,1220,1414,1533,1741,1830,1942,2231,2301,2381,2809,2980,3029,3037,3057,3128,3443,3702,4000,4343,4848,5000,5117,5250,5600,6080,6173,6988,7000,7001,7071,7144,7145,7510,7770,7777,7778,7779,8000,8008,8014,8028,8080,8081,8082,8085,8088,8090,8118,8123,8180,8181,8222,8243,8280,8300,8333,8344,8500,8509,8800,8888,8899,8983,9000,9060,9080,9090,9091,9111,9290,9443,9999,10000,11371,12601,13014,15489,29991,33300,34412,34443,34444,41080,44449,50000,50002,51423,53331,55252,55555,56712]
portvar SHELLCODE_PORTS !0
portvar ORACLE_PORTS 1024:
portvar SSH_PORTS 22
portvar FTP_PORTS [21,2100,3535]
portvar SIP_PORTS [5060,5061,5600]
portvar FILE_DATA_PORTS [$HTTP_PORTS,110,143]
portvar GTP_PORTS [2123,2152,3386]

ipvar AIM_SERVERS [64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24]

config enable_decode_drops
config enable_tcpopt_experimental_drops
config enable_tcpopt_obsolete_drops
config enable_tcpopt_ttcp_drops
config enable_tcpopt_drops
config enable_ipopt_drops
config enable_decode_oversized_drops

config policy_mode:inline
config checksum_drop: all
#config checksum_mode: all
# config flowbits_size: 64
# config ignore_ports: tcp 21 6667:6671 1356
# config ignore_ports: udp 1:17 53
# config response: eth0 attempts 2

config daq: nfq
config daq_dir: /usr/lib/daq/
config daq_mode: inline
config daq_var: queue=8
#config daq_var: proto=ip6
#config daq_var: queue_len=65535

# config set_gid:
# config set_uid:

# config snaplen:
# config bpf_file:

config logdir: /tmp/snort/


config pcre_match_limit: 5000
config pcre_match_limit_recursion: 2500
config detection: search-method ac search-optimize max-pattern-len 20
config event_queue: max_queue 8 log 5 order_events content_length

# config enable_gtp

#config ppm: max-pkt-time 250, \
#   fastpath-expensive-packets, \
#   pkt-log

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

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

config paf_max: 16000

dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
#dynamicdetection directory /usr/local/lib/snort_dynamicrules


# preprocessor gtp: ports { 2123 3386 2152 }

preprocessor normalize_ip4
preprocessor normalize_tcp: ips ecn stream
preprocessor normalize_icmp4
preprocessor normalize_ip6
preprocessor normalize_icmp6

preprocessor frag3_global: max_frags 65536
preprocessor frag3_engine: policy windows detect_anomalies overlap_limit 10 min_fragment_length 100 timeout 180

preprocessor stream5_global: track_tcp yes, \
   track_udp yes, \
   track_icmp yes, \
   max_tcp 10000, \
   max_udp 10000, \
   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 70 79 109 110 111 113 119 135 136 137 139 143 \
        161 445 513 514 587 593 691 1433 1521 1741 2100 3306 6070 6665 6666 6667 6668 6669 \
        7000 8181 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779, \
    ports both 36 80 81 82 83 84 85 86 87 88 89 90 110 311 383 443 465 563 555 591 593 631 636 801 808 818 901 972 989 992 993 994 995 1158 1220 1414 1533 1741 1830 1942 2231 2301 2381 2809 2980 3029 3037 3057 3128 3443 3702 4000 4343 4848 5000 5117 5250 5600 6080 6173 6988 7907 7000 7001 7071 7144 7145 7510 7802 7770 7777 7778 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 8081 8082 8085 8088 8090 8118 8123 8180 8181 8222 8243 8280 8300 8333 8344 8500 8509 8800 8888 8899 8983 9000 9060 9080 9090 9091 9111 9290 9443 9999 10000 11371 12601 13014 15489 29991 33300 34412 34443 34444 41080 44449 50000 50002 51423 53331 55252 55555 56712
preprocessor stream5_udp: timeout 180

# preprocessor perfmonitor: time 300 file /var/snort/snort.stats pktcnt 10000

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 200 \
    small_chunk_length { 10 5 } \
    ports { 36 80 81 82 83 84 85 86 87 88 89 90 311 383 555 591 593 631 801 808 818 901 972 1158 1220 1414 1533 1741 1830 1942 2231 2301 2381 2809 2980 3029 3037 3057 3128 3443 3702 4000 4343 4848 5000 5117 5250 5600 6080 6173 6988 7000 7001 7071 7144 7145 7510 7770 7777 7778 7779 8000 8008 8014 8028 8080 8081 8082 8085 8088 8090 8118 8123 8180 8181 8222 8243 8280 8300 8333 8344 8500 8509 8800 8888 8899 8983 9000 9060 9080 9090 9091 9111 9290 9443 9999 10000 11371 12601 13014 15489 29991 33300 34412 34443 34444 41080 44449 50000 50002 51423 53331 55252 55555 56712 } \
    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

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

preprocessor bo

preprocessor ftp_telnet: global inspection_type stateful encrypted_traffic no check_encrypted
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

#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 }

preprocessor sfportscan: proto  { all } memcap { 500000 } sense_level { medium }

# preprocessor arpspoof
# preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00

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

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$"]

preprocessor dns: ports { 53 } enable_rdata_overflow

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

preprocessor sensitive_data: alert_threshold 25

preprocessor sip: max_sessions 1024, \
   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

#preprocessor imap: \
#   ports { 143 } \
#   b64_decode_depth 0 \
#   qp_decode_depth 0 \
#   bitenc_decode_depth 0 \
#   uu_decode_depth 0

#preprocessor pop: \
#   ports { 110 } \
#   b64_decode_depth 0 \
#   qp_decode_depth 0 \
#   bitenc_decode_depth 0 \
#   uu_decode_depth 0

#preprocessor modbus: ports { 502 }

#preprocessor dnp3: ports { 20000 } \
#   memcap 131077 \
#   check_crc

#preprocessor reputation: \
#   memcap 100, \
#   priority whitelist, \
#   nested_ip inner, \
#   whitelist $WHITE_LIST_PATH/white_list.rules, \
#   blacklist $BLACK_LIST_PATH/L2.blacklist


# output unified2: filename merged.log, limit 128, nostamp, mpls_event_types, vlan_event_types
# output alert_unified2: filename snort.alert, limit 128, nostamp
# output log_unified2: filename snort.log, limit 128, nostamp


Thanks, Ronnie Shield V1.51 SP1 / Operating Mode UTM Router
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Re: Speed issue due to log size too big SOLUTION

user8446
Administrator
All you have to do is change:

output alert_fast: alert.fast

to....

output alert_fast: alert.fast 64K

You have to do this in both Snort7 and Snort8.
Running in bridge mode, 1.51 SP1 fw