config/snort/snort.conf

   1 ###################################################
   2 # IPFire snort.conf
   3 #
   4 # some parts of this file are changed/updated by the webif
   5 ###################################################
   6 # VERSIONS : 2.9.1.1
   7
   8 include /etc/snort/vars
   9
  10 ###################################################
  11 # Step #1: Set the network variables.  For more information, see README.variables
  12 ###################################################
  13
  14 # taken from /etc/snort vars
  15 #ipvar HOME_NET any
  16
  17 # Set up the external network addresses. Leave as "any" in most situations
  18 ipvar EXTERNAL_NET any
  19
  20 # List of DNS servers on your network
  21 #ipvar DNS_SERVERS $HOME_NET
  22
  23 # List of SMTP servers on your network
  24 ipvar SMTP_SERVERS $HOME_NET
  25
  26 # List of web servers on your network
  27 ipvar HTTP_SERVERS $HOME_NET
  28
  29 # List of sql servers on your network
  30 ipvar SQL_SERVERS $HOME_NET
  31
  32 # List of telnet servers on your network
  33 ipvar TELNET_SERVERS $HOME_NET
  34
  35 # List of ssh servers on your network
  36 ipvar SSH_SERVERS $HOME_NET
  37
  38 # List of ftp servers on your network
  39 ipvar FTP_SERVERS $HOME_NET
  40
  41 # List of sip servers on your network
  42 ipvar SIP_SERVERS $HOME_NET
  43
  44 # List of ports you run web servers on
  45 portvar HTTP_PORTS [80,81,311,444,591,593,901,1220,1414,1830,2301,2381,2809,3128,3702,5250,7001,7777,7779,8000,8008,8028,8080,8088,8118,8123,8180,8181,8243,8280,8888,9090,9091,9443,9999,11371,50002,55555]
  46
  47 # List of ports you want to look for SHELLCODE on.
  48 portvar SHELLCODE_PORTS !80
  49
  50 # List of ports you might see oracle attacks on
  51 portvar ORACLE_PORTS 1024:
  52
  53 # List of ports you want to look for SSH connections on:
  54 portvar SSH_PORTS [22,222]
  55
  56 # List of ports you run ftp servers on
  57 portvar FTP_PORTS [21,2100,3535]
  58
  59 # List of ports you run SIP servers on
  60 portvar SIP_PORTS [5060,5061,5600]
  61
  62 # List of file data ports for file inspection
  63 portvar FILE_DATA_PORTS [$HTTP_PORTS,110,143]
  64
  65 # List of GTP ports for GTP preprocessor
  66 portvar GTP_PORTS [2123,2152,3386]
  67
  68 # other variables, these should not be modified
  69 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]
  70
  71 # Path to your rules files (this can be a relative path)
  72 # Note for Windows users:  You are advised to make this an absolute path,
  73 # such as:  c:\snort\rules
  74 var RULE_PATH /etc/snort/rules
  75 var SO_RULE_PATH /etc/snort/so_rules
  76 var PREPROC_RULE_PATH /etc/snort/preproc_rules
  77
  78
  79 ###################################################
  80 # Step #2: Configure the decoder.  For more information, see README.decode
  81 ###################################################
  82
  83 # Stop generic decode events:
  84 config disable_decode_alerts
  85
  86 # Stop Alerts on experimental TCP options
  87 config disable_tcpopt_experimental_alerts
  88
  89 # Stop Alerts on obsolete TCP options
  90 config disable_tcpopt_obsolete_alerts
  91
  92 # Stop Alerts on T/TCP alerts
  93 # config disable_tcpopt_ttcp_alerts
  94
  95 # Stop Alerts on all other TCPOption type events:
  96 config disable_tcpopt_alerts
  97
  98 # Stop Alerts on invalid ip options
  99 # config disable_ipopt_alerts
 100
 101 # Alert if value in length field (IP, TCP, UDP) is greater th elength of the packet
 102 # config enable_decode_oversized_alerts
 103
 104 # Same as above, but drop packet if in Inline mode (requires enable_decode_oversized_alerts)
 105 # config enable_decode_oversized_drops
 106
 107 # Configure IP / TCP checksum mode
 108 config checksum_mode: all
 109
 110 # Configure maximum number of flowbit references.  For more information, see README.flowbits
 111 # config flowbits_size: 64
 112
 113 # Configure ports to ignore
 114 # config ignore_ports: tcp 21 6667:6671 1356
 115 # config ignore_ports: udp 1:17 53
 116
 117 # Configure active response for non inline operation. For more information, see REAMDE.active
 118 # config response: eth0 attempts 2
 119
 120 # Configure DAQ related options for inline operation. For more information, see README.daq
 121 #
 122 # config daq: <type>
 123 # config daq_dir: <dir>
 124 # config daq_mode: <mode>
 125 # config daq_var: <var>
 126 #
 127 # <type> ::= pcap | afpacket | dump | nfq | ipq | ipfw
 128 # <mode> ::= read-file | passive | inline
 129 # <var> ::= arbitrary <name>=<value passed to DAQ
 130 # <dir> ::= path as to where to look for DAQ module so's
 131
 132 # Configure specific UID and GID to run snort as after dropping privs. For more information see snort -h command line options
 133 #
 134 # config set_gid:
 135 # config set_uid:
 136
 137 # Configure default snaplen. Snort defaults to MTU of in use interface. For more information see README
 138 #
 139 # config snaplen:
 140 #
 141
 142 # Configure default bpf_file to use for filtering what traffic reaches snort. For more information see snort -h command line options (-F)
 143 #
 144 # config bpf_file:
 145 #
 146
 147 # Configure default log directory for snort to log to.  For more information see snort -h command line options (-l)
 148 #
 149 # config logdir:
 150
 151
 152 ###################################################
 153 # Step #3: Configure the base detection engine.  For more information, see  README.decode
 154 ###################################################
 155
 156 # Configure PCRE match limitations
 157 config pcre_match_limit: 3500
 158 config pcre_match_limit_recursion: 1500
 159
 160 # Configure the detection engine  See the Snort Manual, Configuring Snort - Includes - Config
 161 config detection: search-method ac-split search-optimize max-pattern-len 20
 162
 163 # Configure the event queue.  For more information, see README.event_queue
 164 config event_queue: max_queue 8 log 3 order_events content_length
 165
 166 ###################################################
 167 ## Configure GTP if it is to be used.
 168 ## For more information, see README.GTP
 169 ####################################################
 170
 171 # config enable_gtp
 172
 173 ###################################################
 174 # Per packet and rule latency enforcement
 175 # For more information see README.ppm
 176 ###################################################
 177
 178 # Per Packet latency configuration
 179 #config ppm: max-pkt-time 250, \
 180 #   fastpath-expensive-packets, \
 181 #   pkt-log
 182
 183 # Per Rule latency configuration
 184 #config ppm: max-rule-time 200, \
 185 #   threshold 3, \
 186 #   suspend-expensive-rules, \
 187 #   suspend-timeout 20, \
 188 #   rule-log alert
 189
 190 ###################################################
 191 # Configure Perf Profiling for debugging
 192 # For more information see README.PerfProfiling
 193 ###################################################
 194
 195 #config profile_rules: print all, sort avg_ticks
 196 #config profile_preprocs: print all, sort avg_ticks
 197
 198 ###################################################
 199 # Configure protocol aware flushing
 200 # For more information see README.stream5
 201 ###################################################
 202 config paf_max: 16000
 203
 204 ###################################################
 205 # Step #4: Configure dynamic loaded libraries.
 206 # For more information, see Snort Manual, Configuring Snort - Dynamic Modules
 207 ###################################################
 208
 209 # path to dynamic preprocessor libraries
 210 dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
 211
 212 # path to base preprocessor engine
 213 dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
 214
 215 # path to dynamic rules libraries
 216 # dynamicdetection directory /usr/local/lib/snort_dynamicrules
 217
 218 ###################################################
 219 # Step #5: Configure preprocessors
 220 # For more information, see the Snort Manual, Configuring Snort - Preprocessors
 221 ###################################################
 222
 223 # GTP Control Channle Preprocessor. For more information, see README.GTP
 224 # preprocessor gtp: ports { 2123 3386 2152 }
 225
 226 # Inline packet normalization. For more information, see README.normalize
 227 # Does nothing in IDS mode
 228 preprocessor normalize_ip4
 229 preprocessor normalize_tcp: ips ecn stream
 230 preprocessor normalize_icmp4
 231 preprocessor normalize_ip6
 232 preprocessor normalize_icmp6
 233
 234 # Target-based IP defragmentation.  For more inforation, see README.frag3
 235 preprocessor frag3_global: max_frags 65536
 236 preprocessor frag3_engine: policy windows detect_anomalies overlap_limit 10 min_fragment_length 100 timeout 180
 237
 238 # Target-Based stateful inspection/stream reassembly.  For more inforation, see README.stream5
 239 preprocessor stream5_global: track_tcp yes, \
 240    track_udp yes, \
 241    track_icmp no, \
 242    max_tcp 262144, \
 243    max_udp 131072, \
 244    max_active_responses 2, \
 245    min_response_seconds 5
 246 preprocessor stream5_tcp: policy windows, detect_anomalies, require_3whs 180, \
 247    overlap_limit 10, small_segments 3 bytes 150, timeout 180, \
 248     ports client 21 22 23 25 42 53 79 109 110 111 113 119 135 136 137 139 143 \
 249         161 445 513 514 587 593 691 1433 1521 2100 3306 6070 6665 6666 6667 6668 6669 \
 250         7000 8181 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779, \
 251     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 5250 7907 7001 7802 7777 7779 \
 252         7801 7900 7901 7902 7903 7904 7905 7906 7908 7909 7910 7911 7912 7913 7914 7915 7916 \
 253         7917 7918 7919 7920 8000 8008 8028 8080 8088 8118 8123 8180 8243 8280 8888 9090 9091 9443 9999 11371 50002 55555
 254 preprocessor stream5_udp: timeout 180
 255
 256 # performance statistics.  For more information, see the Snort Manual, Configuring Snort - Preprocessors - Performance Monitor
 257 # preprocessor perfmonitor: time 300 file /var/snort/snort.stats pktcnt 10000
 258
 259 # HTTP normalization and anomaly detection.  For more information, see README.http_inspect
 260 preprocessor http_inspect: global iis_unicode_map unicode.map 1252 compress_depth 65535 decompress_depth 65535
 261 preprocessor http_inspect_server: server default \
 262     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 } \
 263     chunk_length 500000 \
 264     server_flow_depth 0 \
 265     client_flow_depth 0 \
 266     post_depth 65495 \
 267     oversize_dir_length 500 \
 268     max_header_length 750 \
 269     max_headers 100 \
 270     max_spaces 200 \
 271     small_chunk_length { 10 5 } \
 272     ports { 80 81 311 591 593 901 1220 1414 1830 2301 2381 2809 3128 3702 5250 7001 7777 7779 8000 8008 8028 8080 8088 8118 8123 8180 8181 8243 8280 8888 9090 9091 9443 9999 11371 50002 55555 } \
 273     non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
 274     enable_cookie \
 275     extended_response_inspection \
 276     inspect_gzip \
 277     normalize_utf \
 278     unlimited_decompress \
 279     normalize_javascript \
 280     apache_whitespace no \
 281     ascii no \
 282     bare_byte no \
 283     directory no \
 284     double_decode no \
 285     iis_backslash no \
 286     iis_delimiter no \
 287     iis_unicode no \
 288     multi_slash no \
 289    utf_8 no \
 290     u_encode yes \
 291     webroot no
 292
 293 # ONC-RPC normalization and anomaly detection.  For more information, see the Snort Manual, Configuring Snort - Preprocessors - RPC Decode
 294 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
 295
 296 # Back Orifice detection.
 297 preprocessor bo
 298
 299 # FTP / Telnet normalization and anomaly detection.  For more information, see README.ftptelnet
 300 preprocessor ftp_telnet: global inspection_type stateful encrypted_traffic no check_encrypted
 301 preprocessor ftp_telnet_protocol: telnet \
 302     ayt_attack_thresh 20 \
 303     normalize ports { 23 } \
 304     detect_anomalies
 305 preprocessor ftp_telnet_protocol: ftp server default \
 306     def_max_param_len 100 \
 307     ports { 21 2100 3535 } \
 308     telnet_cmds yes \
 309     ignore_telnet_erase_cmds yes \
 310     ftp_cmds { ABOR ACCT ADAT ALLO APPE AUTH CCC CDUP } \
 311     ftp_cmds { CEL CLNT CMD CONF CWD DELE ENC EPRT } \
 312     ftp_cmds { EPSV ESTA ESTP FEAT HELP LANG LIST LPRT } \
 313     ftp_cmds { LPSV MACB MAIL MDTM MIC MKD MLSD MLST } \
 314     ftp_cmds { MODE NLST NOOP OPTS PASS PASV PBSZ PORT } \
 315     ftp_cmds { PROT PWD QUIT REIN REST RETR RMD RNFR } \
 316     ftp_cmds { RNTO SDUP SITE SIZE SMNT STAT STOR STOU } \
 317     ftp_cmds { STRU SYST TEST TYPE USER XCUP XCRC XCWD } \
 318     ftp_cmds { XMAS XMD5 XMKD XPWD XRCP XRMD XRSQ XSEM } \
 319     ftp_cmds { XSEN XSHA1 XSHA256 } \
 320     alt_max_param_len 0 { ABOR CCC CDUP ESTA FEAT LPSV NOOP PASV PWD QUIT REIN STOU SYST XCUP XPWD } \
 321     alt_max_param_len 200 { ALLO APPE CMD HELP NLST RETR RNFR STOR STOU XMKD } \
 322     alt_max_param_len 256 { CWD RNTO } \
 323     alt_max_param_len 400 { PORT } \
 324     alt_max_param_len 512 { SIZE } \
 325     chk_str_fmt { ACCT ADAT ALLO APPE AUTH CEL CLNT CMD } \
 326     chk_str_fmt { CONF CWD DELE ENC EPRT EPSV ESTP HELP } \
 327     chk_str_fmt { LANG LIST LPRT MACB MAIL MDTM MIC MKD } \
 328     chk_str_fmt { MLSD MLST MODE NLST OPTS PASS PBSZ PORT } \
 329     chk_str_fmt { PROT REST RETR RMD RNFR RNTO SDUP SITE } \
 330     chk_str_fmt { SIZE SMNT STAT STOR STRU TEST TYPE USER } \
 331     chk_str_fmt { XCRC XCWD XMAS XMD5 XMKD XRCP XRMD XRSQ } \
 332     chk_str_fmt { XSEM XSEN XSHA1 XSHA256 } \
 333     cmd_validity ALLO < int [ char R int ] > \
 334     cmd_validity EPSV < [ { char 12 | char A char L char L } ] > \
 335     cmd_validity MACB < string > \
 336     cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
 337     cmd_validity MODE < char ASBCZ > \
 338     cmd_validity PORT < host_port > \
 339     cmd_validity PROT < char CSEP > \
 340     cmd_validity STRU < char FRPO [ string ] > \
 341     cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [ number ] } >
 342 preprocessor ftp_telnet_protocol: ftp client default \
 343     max_resp_len 256 \
 344     bounce yes \
 345     ignore_telnet_erase_cmds yes \
 346     telnet_cmds yes
 347
 348
 349 # SMTP normalization and anomaly detection.  For more information, see README.SMTP
 350 preprocessor smtp: ports { 25 465 587 691 } \
 351     inspection_type stateful \
 352     b64_decode_depth 0 \
 353     qp_decode_depth 0 \
 354     bitenc_decode_depth 0 \
 355     uu_decode_depth 0 \
 356     log_mailfrom \
 357     log_rcptto \
 358     log_filename \
 359     log_email_hdrs \
 360     normalize cmds \
 361     normalize_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM ETRN EVFY } \
 362     normalize_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET SAML SEND SOML } \
 363     normalize_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP X-ERCP X-EXCH50 } \
 364     normalize_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \
 365     max_command_line_len 512 \
 366     max_header_line_len 1000 \
 367     max_response_line_len 512 \
 368     alt_max_command_line_len 260 { MAIL } \
 369     alt_max_command_line_len 300 { RCPT } \
 370     alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \
 371     alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET } \
 372     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 } \
 373     valid_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM ETRN EVFY } \
 374     valid_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET SAML SEND SOML } \
 375     valid_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP X-ERCP X-EXCH50 } \
 376     valid_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \
 377     xlink2state { enabled }
 378
 379 # Portscan detection.  For more information, see README.sfportscan
 380 preprocessor sfportscan: proto  { all } memcap { 10000000 } sense_level { medium }
 381
 382 # ARP spoof detection.  For more information, see the Snort Manual - Configuring Snort - Preprocessors - ARP Spoof Preprocessor
 383 # preprocessor arpspoof
 384 # preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00
 385
 386 # SSH anomaly detection.  For more information, see README.ssh
 387 preprocessor ssh: server_ports { 22,222 } \
 388                   autodetect \
 389                   max_client_bytes 19600 \
 390                   max_encrypted_packets 20 \
 391                   max_server_version_len 100 \
 392                   enable_respoverflow enable_ssh1crc32 \
 393                   enable_srvoverflow enable_protomismatch
 394
 395 # SMB / DCE-RPC normalization and anomaly detection.  For more information, see README.dcerpc2
 396 preprocessor dcerpc2: memcap 102400, events [co ]
 397 preprocessor dcerpc2_server: default, policy WinXP, \
 398     detect [smb [139,445], tcp 135, udp 135, rpc-over-http-server 593], \
 399     autodetect [tcp 1025:, udp 1025:, rpc-over-http-server 1025:], \
 400     smb_max_chain 3, smb_invalid_shares ["C$", "D$", "ADMIN$"]
 401
 402 # DNS anomaly detection.  For more information, see README.dns
 403 preprocessor dns: ports { 53 } enable_rdata_overflow
 404
 405 # SSL anomaly detection and traffic bypass.  For more information, see README.ssl
 406 preprocessor ssl: ports { 443 444 465 563 636 989 992 993 994 995 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
 407
 408 # SDF sensitive data preprocessor.  For more information see README.sensitive_data
 409 preprocessor sensitive_data: alert_threshold 25
 410
 411 # SIP Session Initiation Protocol preprocessor.  For more information see README.sip
 412 preprocessor sip: max_sessions 10000, \
 413    ports { 5060 5061 5600 }, \
 414    methods { invite \
 415              cancel \
 416              ack \
 417              bye \
 418              register \
 419              options \
 420              refer \
 421              subscribe \
 422              update \
 423              join \
 424              info \
 425              message \
 426              notify \
 427              benotify \
 428              do \
 429              qauth \
 430              sprack \
 431              publish \
 432              service \
 433              unsubscribe \
 434              prack }, \
 435    max_uri_len 512, \
 436    max_call_id_len 80, \
 437    max_requestName_len 20, \
 438    max_from_len 256, \
 439    max_to_len 256, \
 440    max_via_len 1024, \
 441    max_contact_len 512, \
 442    max_content_len 1024
 443
 444 # IMAP preprocessor.  For more information see README.imap
 445 preprocessor imap: \
 446    ports { 143 } \
 447    b64_decode_depth 0 \
 448    qp_decode_depth 0 \
 449    bitenc_decode_depth 0 \
 450    uu_decode_depth 0
 451
 452 # POP preprocessor. For more information see README.pop
 453 preprocessor pop: \
 454    ports { 110 } \
 455    b64_decode_depth 0 \
 456    qp_decode_depth 0 \
 457    bitenc_decode_depth 0 \
 458    uu_decode_depth 0
 459
 460 # Modbus preprocessor. For more information see README.modbus
 461 preprocessor modbus: ports { 502 }
 462
 463 # DNP3 preprocessor. For more information see README.dnp3
 464 preprocessor dnp3: ports { 20000 } \
 465    memcap 262144 \
 466    check_crc
 467
 468 ###################################################
 469 # Step #6: Configure output plugins
 470 # For more information, see Snort Manual, Configuring Snort - Output Modules
 471 ###################################################
 472
 473 # unified2
 474 # Recommended for most installs
 475 # output unified2: filename merged.log, limit 128, nostamp, mpls_event_types, vlan_event_types
 476
 477 # Additional configuration for specific types of installs
 478 # output alert_unified2: filename snort.alert, limit 128, nostamp
 479 # output log_unified2: filename snort.log, limit 128, nostamp
 480
 481 # syslog
 482 # output alert_syslog: LOG_AUTH LOG_ALERT
 483
 484 # pcap
 485 # output log_tcpdump: tcpdump.log
 486
 487 # database
 488 # output database: alert, <db_type>, user=<username> password=<password> test dbname=<name> host=<hostname>
 489 # output database: log, <db_type>, user=<username> password=<password> test dbname=<name> host=<hostname>
 490
 491 # prelude
 492 # output alert_prelude
 493
 494 # metadata reference data.  do not modify these lines
 495 include /etc/snort/rules/classification.config
 496 include /etc/snort/rules/reference.config
 497
 498
 499 ###################################################
 500 # Step #7: Customize your rule set
 501 # For more information, see Snort Manual, Writing Snort Rules
 502 ###################################################
 503
 504 #
 505 # site specific rules
 506 #