suricata: Change midstream policy to "pass-flow"

[people/pmueller/ipfire-2.x.git] / config / suricata / suricata.yaml

%YAML 1.1
---

##
## IPFire specific configuration file - an untouched example configuration
## can be found in suricata-example.yaml.
##

vars:
  address-groups:
    # Include HOME_NET declaration from external file.
    include: /var/ipfire/suricata/suricata-homenet.yaml

    # Include DNS_SERVERS declaration from external file.
    include: /var/ipfire/suricata/suricata-dns-servers.yaml

    EXTERNAL_NET: "any"

    HTTP_SERVERS: "$HOME_NET"
    SMTP_SERVERS: "$HOME_NET"
    SQL_SERVERS: "$HOME_NET"
    TELNET_SERVERS: "$HOME_NET"
    AIM_SERVERS: "$EXTERNAL_NET"
    DC_SERVERS: "$HOME_NET"
    DNP3_SERVER: "$HOME_NET"
    DNP3_CLIENT: "$HOME_NET"
    MODBUS_CLIENT: "$HOME_NET"
    MODBUS_SERVER: "$HOME_NET"
    ENIP_CLIENT: "$HOME_NET"
    ENIP_SERVER: "$HOME_NET"

  port-groups:
    # Incluse HTTP_PORTS declaration from external file.
    include: /var/ipfire/suricata/suricata-http-ports.yaml

    SHELLCODE_PORTS: "!80"
    ORACLE_PORTS: 1521
    SSH_PORTS: "[22,222]"
    DNP3_PORTS: 20000
    MODBUS_PORTS: 502
    FILE_DATA_PORTS: "[$HTTP_PORTS,110,143]"
    FTP_PORTS: 21
    GENEVE_PORTS: 6081
    VXLAN_PORTS: 4789
    TEREDO_PORTS: 3544

##
## Ruleset specific options.
##
default-rule-path: /var/lib/suricata
rule-files:
    # Include enabled ruleset files from external file.
    include: /var/ipfire/suricata/suricata-used-rulesfiles.yaml

classification-file: /usr/share/suricata/classification.config
reference-config-file: /usr/share/suricata/reference.config
threshold-file: /usr/share/suricata/threshold.config

##
## Logging options.
##
default-log-dir: /var/log/suricata/

# Global stats configuration
stats:
  enabled: no
  # The interval field (in seconds) controls the interval at
  # which stats are updated in the log.
  interval: 8
  # Add decode events to stats.
  #decoder-events: true
  # Decoder event prefix in stats. Has been 'decoder' before, but that leads
  # to missing events in the eve.stats records. See issue #2225.
  #decoder-events-prefix: "decoder.event"
  # Add stream events as stats.
  #stream-events: false

# Plugins -- Experimental -- specify the filename for each plugin shared object
plugins:
#   - /path/to/plugin.so

# Configure the type of alert (and other) logging you would like.
outputs:
  # a line based alerts log similar to Snort's fast.log
  - fast:
      enabled: yes
      filename: fast.log
      append: yes
      #filetype: regular # 'regular', 'unix_stream' or 'unix_dgram'

  # Stats.log contains data from various counters of the suricata engine.
  - stats:
      enabled: no
      filename: stats.log
      append: no       # append to file (yes) or overwrite it (no)
      totals: yes       # stats for all threads merged together
      threads: no       # per thread stats
      #null-values: yes  # print counters that have value 0

  # Extensible Event Format (nicknamed EVE) event log in JSON format
  - eve-log:
      enabled: no
      filetype: regular #regular|syslog|unix_dgram|unix_stream|redis
      filename: eve.json
      # Enable for multi-threaded eve.json output; output files are amended with
      # an identifier, e.g., eve.9.json
      #threaded: false
      #prefix: "@cee: " # prefix to prepend to each log entry
      # the following are valid when type: syslog above
      #identity: "suricata"
      #facility: local5
      #level: Info ## possible levels: Emergency, Alert, Critical,
                   ## Error, Warning, Notice, Info, Debug
      #ethernet: no  # log ethernet header in events when available
      #redis:
      #  server: 127.0.0.1
      #  port: 6379
      #  async: true ## if redis replies are read asynchronously
      #  mode: list ## possible values: list|lpush (default), rpush, channel|publish
      #             ## lpush and rpush are using a Redis list. "list" is an alias for lpush
      #             ## publish is using a Redis channel. "channel" is an alias for publish
      #  key: suricata ## key or channel to use (default to suricata)
      # Redis pipelining set up. This will enable to only do a query every
      # 'batch-size' events. This should lower the latency induced by network
      # connection at the cost of some memory. There is no flushing implemented
      # so this setting should be reserved to high traffic Suricata deployments.
      #  pipelining:
      #    enabled: yes ## set enable to yes to enable query pipelining
      #    batch-size: 10 ## number of entries to keep in buffer

      # Include top level metadata. Default yes.
      #metadata: no

      # include the name of the input pcap file in pcap file processing mode
      pcap-file: false

      # Community Flow ID
      # Adds a 'community_id' field to EVE records. These are meant to give
      # records a predictable flow ID that can be used to match records to
      # output of other tools such as Zeek (Bro).
      #
      # Takes a 'seed' that needs to be same across sensors and tools
      # to make the id less predictable.

      # enable/disable the community id feature.
      community-id: false
      # Seed value for the ID output. Valid values are 0-65535.
      community-id-seed: 0

      # HTTP X-Forwarded-For support by adding an extra field or overwriting
      # the source or destination IP address (depending on flow direction)
      # with the one reported in the X-Forwarded-For HTTP header. This is
      # helpful when reviewing alerts for traffic that is being reverse
      # or forward proxied.
      xff:
        enabled: no
        # Two operation modes are available: "extra-data" and "overwrite".
        mode: extra-data
        # Two proxy deployments are supported: "reverse" and "forward". In
        # a "reverse" deployment the IP address used is the last one, in a
        # "forward" deployment the first IP address is used.
        deployment: reverse
        # Header name where the actual IP address will be reported. If more
        # than one IP address is present, the last IP address will be the
        # one taken into consideration.
        header: X-Forwarded-For

      types:
        - alert:
            # payload: yes             # enable dumping payload in Base64
            # payload-buffer-size: 4kb # max size of payload buffer to output in eve-log
            # payload-printable: yes   # enable dumping payload in printable (lossy) format
            # packet: yes              # enable dumping of packet (without stream segments)
            # metadata: no             # enable inclusion of app layer metadata with alert. Default yes
            # http-body: yes           # Requires metadata; enable dumping of HTTP body in Base64
            # http-body-printable: yes # Requires metadata; enable dumping of HTTP body in printable format

            # Enable the logging of tagged packets for rules using the
            # "tag" keyword.
            tagged-packets: yes
            # Enable logging the final action taken on a packet by the engine
            # (e.g: the alert may have action 'allowed' but the verdict be
            # 'drop' due to another alert. That's the engine's verdict)
            # verdict: yes
        # app layer frames
        - frame:
            # disabled by default as this is very verbose.
            enabled: no
        - anomaly:
            # Anomaly log records describe unexpected conditions such
            # as truncated packets, packets with invalid IP/UDP/TCP
            # length values, and other events that render the packet
            # invalid for further processing or describe unexpected
            # behavior on an established stream. Networks which
            # experience high occurrences of anomalies may experience
            # packet processing degradation.
            #
            # Anomalies are reported for the following:
            # 1. Decode: Values and conditions that are detected while
            # decoding individual packets. This includes invalid or
            # unexpected values for low-level protocol lengths as well
            # as stream related events (TCP 3-way handshake issues,
            # unexpected sequence number, etc).
            # 2. Stream: This includes stream related events (TCP
            # 3-way handshake issues, unexpected sequence number,
            # etc).
            # 3. Application layer: These denote application layer
            # specific conditions that are unexpected, invalid or are
            # unexpected given the application monitoring state.
            #
            # By default, anomaly logging is enabled. When anomaly
            # logging is enabled, applayer anomaly reporting is
            # also enabled.
            enabled: yes
            #
            # Choose one or more types of anomaly logging and whether to enable
            # logging of the packet header for packet anomalies.
            types:
              # decode: no
              # stream: no
              # applayer: yes
            #packethdr: no
        - http:
            extended: yes     # enable this for extended logging information
            # custom allows additional HTTP fields to be included in eve-log.
            # the example below adds three additional fields when uncommented
            #custom: [Accept-Encoding, Accept-Language, Authorization]
            # set this value to one and only one from {both, request, response}
            # to dump all HTTP headers for every HTTP request and/or response
            # dump-all-headers: none
        - dns:
            # This configuration uses the new DNS logging format,
            # the old configuration is still available:
            # https://docs.suricata.io/en/latest/output/eve/eve-json-output.html#dns-v1-format

            # As of Suricata 5.0, version 2 of the eve dns output
            # format is the default.
            #version: 2

            # Enable/disable this logger. Default: enabled.
            #enabled: yes

            # Control logging of requests and responses:
            # - requests: enable logging of DNS queries
            # - responses: enable logging of DNS answers
            # By default both requests and responses are logged.
            #requests: no
            #responses: no

            # Format of answer logging:
            # - detailed: array item per answer
            # - grouped: answers aggregated by type
            # Default: all
            #formats: [detailed, grouped]

            # DNS record types to log, based on the query type.
            # Default: all.
            #types: [a, aaaa, cname, mx, ns, ptr, txt]
        - tls:
            extended: yes     # enable this for extended logging information
            # output TLS transaction where the session is resumed using a
            # session id
            #session-resumption: no
            # custom controls which TLS fields that are included in eve-log
            #custom: [subject, issuer, session_resumed, serial, fingerprint, sni, version, not_before, not_after, certificate, chain, ja3, ja3s]
        - files:
            force-magic: no   # force logging magic on all logged files
            # force logging of checksums, available hash functions are md5,
            # sha1 and sha256
            #force-hash: [md5]
        #- drop:
        #    alerts: yes      # log alerts that caused drops
        #    flows: all       # start or all: 'start' logs only a single drop
        #                     # per flow direction. All logs each dropped pkt.
            # Enable logging the final action taken on a packet by the engine
            # (will show more information in case of a drop caused by 'reject')
            # verdict: yes
        - smtp:
            #extended: yes # enable this for extended logging information
            # this includes: bcc, message-id, subject, x_mailer, user-agent
            # custom fields logging from the list:
            #  reply-to, bcc, message-id, subject, x-mailer, user-agent, received,
            #  x-originating-ip, in-reply-to, references, importance, priority,
            #  sensitivity, organization, content-md5, date
            #custom: [received, x-mailer, x-originating-ip, relays, reply-to, bcc]
            # output md5 of fields: body, subject
            # for the body you need to set app-layer.protocols.smtp.mime.body-md5
            # to yes
            #md5: [body, subject]

        #- dnp3
        - ftp
        - rdp
        - nfs
        - smb
        - tftp
        - ike
        - dcerpc
        - krb5
        - bittorrent-dht
        - snmp
        - rfb
        - sip
        - quic
        - dhcp:
            enabled: yes
            # When extended mode is on, all DHCP messages are logged
            # with full detail. When extended mode is off (the
            # default), just enough information to map a MAC address
            # to an IP address is logged.
            extended: no
        - ssh
        - mqtt:
            # passwords: yes           # enable output of passwords
        - http2
        - pgsql:
            enabled: no
            # passwords: yes           # enable output of passwords. Disabled by default
        - stats:
            totals: yes       # stats for all threads merged together
            threads: no       # per thread stats
            deltas: no        # include delta values
        # bi-directional flows
        - flow
        # uni-directional flows
        #- netflow

        # Metadata event type. Triggered whenever a pktvar is saved
        # and will include the pktvars, flowvars, flowbits and
        # flowints.
        #- metadata

        # EXPERIMENTAL per packet output giving TCP state tracking details
        # including internal state, flags, etc.
        # This output is experimental, meant for debugging and subject to
        # change in both config and output without any notice.
        #- stream:
        #   all: false                      # log all TCP packets
        #   event-set: false                # log packets that have a decoder/stream event
        #   state-update: false             # log packets triggering a TCP state update
        #   spurious-retransmission: false  # log spurious retransmission packets

logging:
  # The default log level: can be overridden in an output section.
  # Note that debug level logging will only be emitted if Suricata was
  # compiled with the --enable-debug configure option.
  #
  # This value is overridden by the SC_LOG_LEVEL env var.
  default-log-level: Info

  # The default output format.  Optional parameter, should default to
  # something reasonable if not provided.  Can be overridden in an
  # output section.  You can leave this out to get the default.
  #
  # This console log format value can be overridden by the SC_LOG_FORMAT env var.
  #default-log-format: "%D: %S: %M"
  #
  # For the pre-7.0 log format use:
  #default-log-format: "[%i] %t [%S] - (%f:%l) <%d> (%n) -- "

  # A regex to filter output.  Can be overridden in an output section.
  # Defaults to empty (no filter).
  #
  # This value is overridden by the SC_LOG_OP_FILTER env var.
  default-output-filter:

  # Requires libunwind to be available when Suricata is configured and built.
  # If a signal unexpectedly terminates Suricata, displays a brief diagnostic
  # message with the offending stacktrace if enabled.
  #stacktrace-on-signal: on

  # Define your logging outputs.  If none are defined, or they are all
  # disabled you will get the default: console output.
  outputs:
  - console:
      enabled: no
      # type: json
  - file:
      enabled: no
      level: info
      filename: /var/log/suricata/suricata.log
      # format: "[%i - %m] %z %d: %S: %M"
      # type: json
  - syslog:
      enabled: yes
      facility: local5
      format: ""
      #format: "[%i] <%d> -- "
      # type: json

##
## Netfilter configuration
##

nfq:
   mode: repeat
   repeat-mark: 2147483648
   repeat-mask: 2147483648
   bypass-mark: 1073741824
   bypass-mask: 1073741824
#  route-queue: 2
#  batchcount: 20
   fail-open: no

##
## Step 5: App Layer Protocol Configuration
##

# Configure the app-layer parsers.
#
# The error-policy setting applies to all app-layer parsers. Values can be
# "drop-flow", "pass-flow", "bypass", "drop-packet", "pass-packet", "reject" or
# "ignore" (the default).
#
# The protocol's section details each protocol.
#
# The option "enabled" takes 3 values - "yes", "no", "detection-only".
# "yes" enables both detection and the parser, "no" disables both, and
# "detection-only" enables protocol detection only (parser disabled).
app-layer:
  # error-policy: ignore
  protocols:
    telnet:
      enabled: yes
    rfb:
      enabled: yes
      detection-ports:
        dp: 5900, 5901, 5902, 5903, 5904, 5905, 5906, 5907, 5908, 5909
    mqtt:
      enabled: yes
      # max-msg-length: 1mb
      # subscribe-topic-match-limit: 100
      # unsubscribe-topic-match-limit: 100
      # Maximum number of live MQTT transactions per flow
      # max-tx: 4096
    krb5:
      enabled: yes
    bittorrent-dht:
      enabled: yes
    snmp:
      enabled: yes
    ike:
      enabled: yes
    tls:
      enabled: yes
      detection-ports:
        dp: "[443,444,465,853,993,995]"

      # Generate JA3 fingerprint from client hello. If not specified it
      # will be disabled by default, but enabled if rules require it.
      ja3-fingerprints: auto

      # What to do when the encrypted communications start:
      # - default: keep tracking TLS session, check for protocol anomalies,
      #            inspect tls_* keywords. Disables inspection of unmodified
      #            'content' signatures.
      # - bypass:  stop processing this flow as much as possible. No further
      #            TLS parsing and inspection. Offload flow bypass to kernel
      #            or hardware if possible.
      # - full:    keep tracking and inspection as normal. Unmodified content
      #            keyword signatures are inspected as well.
      #
      # For best performance, select 'bypass'.
      #
      encryption-handling: bypass

    pgsql:
      enabled: no
      # Stream reassembly size for PostgreSQL. By default, track it completely.
      stream-depth: 0
      # Maximum number of live PostgreSQL transactions per flow
      # max-tx: 1024
    dcerpc:
      enabled: yes
      # Maximum number of live DCERPC transactions per flow
      # max-tx: 1024
    ftp:
      enabled: yes
      # memcap: 64mb
    rdp:
      enabled: yes
    ssh:
      enabled: yes
      #hassh: yes
    http2:
      enabled: yes
      # Maximum number of live HTTP2 streams in a flow
      #max-streams: 4096
      # Maximum headers table size
      #max-table-size: 65536
      # Maximum reassembly size for header + continuation frames
      #max-reassembly-size: 102400
    smtp:
      enabled: yes
      raw-extraction: no
      # Maximum number of live SMTP transactions per flow
      # max-tx: 256
      # Configure SMTP-MIME Decoder
      mime:
        # Decode MIME messages from SMTP transactions
        # (may be resource intensive)
        # This field supersedes all others because it turns the entire
        # process on or off
        decode-mime: yes

        # Decode MIME entity bodies (ie. Base64, quoted-printable, etc.)
        decode-base64: yes
        decode-quoted-printable: yes

        # Maximum bytes per header data value stored in the data structure
        # (default is 2000)
        header-value-depth: 2000

        # Extract URLs and save in state data structure
        extract-urls: yes
        # Scheme of URLs to extract
        # (default is [http])
        #extract-urls-schemes: [http, https, ftp, mailto]
        # Log the scheme of URLs that are extracted
        # (default is no)
        #log-url-scheme: yes
        # Set to yes to compute the md5 of the mail body. You will then
        # be able to journalize it.
        body-md5: no
      # Configure inspected-tracker for file_data keyword
      inspected-tracker:
        content-limit: 100000
        content-inspect-min-size: 32768
        content-inspect-window: 4096
    imap:
      enabled: yes
    smb:
      enabled: yes
      detection-ports:
        dp: 139, 445
      # Maximum number of live SMB transactions per flow
      # max-tx: 1024

      # Stream reassembly size for SMB streams. By default track it completely.
      #stream-depth: 0

    nfs:
      enabled: yes
      # max-tx: 1024
    tftp:
      enabled: yes
    dns:
      # memcaps. Globally and per flow/state.
      global-memcap: 32mb
      state-memcap: 512kb

      # How many unreplied DNS requests are considered a flood.
      # If the limit is reached, app-layer-event:dns.flooded; will match.
      #request-flood: 512

      tcp:
        enabled: yes
        detection-ports:
          dp: 53
      udp:
        enabled: yes
        detection-ports:
          dp: 53
    http:
      enabled: yes
      memcap: 256mb

      # Byte Range Containers default settings
      # byterange:
      #   memcap: 100mb
      #   timeout: 60

      # memcap:                   Maximum memory capacity for HTTP
      #                           Default is unlimited, values can be 64mb, e.g.

      # default-config:           Used when no server-config matches
      #   personality:            List of personalities used by default
      #   request-body-limit:     Limit reassembly of request body for inspection
      #                           by http_client_body & pcre /P option.
      #   response-body-limit:    Limit reassembly of response body for inspection
      #                           by file_data, http_server_body & pcre /Q option.
      #
      #   For advanced options, see the user guide


      # server-config:            List of server configurations to use if address matches
      #   address:                List of IP addresses or networks for this block
      #   personality:            List of personalities used by this block
      #
      #                           Then, all the fields from default-config can be overloaded
      #
      # Currently Available Personalities:
      #   Minimal, Generic, IDS (default), IIS_4_0, IIS_5_0, IIS_5_1, IIS_6_0,
      #   IIS_7_0, IIS_7_5, Apache_2
      libhtp:
         default-config:
           personality: IDS

           # Can be specified in kb, mb, gb.  Just a number indicates
           # it's in bytes.
           request-body-limit: 100kb
           response-body-limit: 100kb

           # inspection limits
           request-body-minimal-inspect-size: 32kb
           request-body-inspect-window: 4kb
           response-body-minimal-inspect-size: 40kb
           response-body-inspect-window: 16kb

           # response body decompression (0 disables)
           response-body-decompress-layer-limit: 2

           # auto will use http-body-inline mode in IPS mode, yes or no set it statically
           http-body-inline: auto

           # Decompress SWF files. Disabled by default.
           # Two types: 'deflate', 'lzma', 'both' will decompress deflate and lzma
           # compress-depth:
           # Specifies the maximum amount of data to decompress,
           # set 0 for unlimited.
           # decompress-depth:
           # Specifies the maximum amount of decompressed data to obtain,
           # set 0 for unlimited.
           swf-decompression:
             enabled: no
             type: both
             compress-depth: 100kb
             decompress-depth: 100kb

           # Use a random value for inspection sizes around the specified value.
           # This lowers the risk of some evasion techniques but could lead
           # to detection change between runs. It is set to 'yes' by default.
           #randomize-inspection-sizes: yes
           # If "randomize-inspection-sizes" is active, the value of various
           # inspection size will be chosen from the [1 - range%, 1 + range%]
           # range
           # Default value of "randomize-inspection-range" is 10.
           #randomize-inspection-range: 10

           # decoding
           double-decode-path: no
           double-decode-query: no

           # Can enable LZMA decompression
           #lzma-enabled: false
           # Memory limit usage for LZMA decompression dictionary
           # Data is decompressed until dictionary reaches this size
           #lzma-memlimit: 1mb
           # Maximum decompressed size with a compression ratio
           # above 2048 (only LZMA can reach this ratio, deflate cannot)
           #compression-bomb-limit: 1mb
           # Maximum time spent decompressing a single transaction in usec
           #decompression-time-limit: 100000
           # Maximum number of live transactions per flow
           #max-tx: 512

         server-config:

           #- apache:
           #    address: [192.168.1.0/24, 127.0.0.0/8, "::1"]
           #    personality: Apache_2
           #    # Can be specified in kb, mb, gb.  Just a number indicates
           #    # it's in bytes.
           #    request-body-limit: 4096
           #    response-body-limit: 4096
           #    double-decode-path: no
           #    double-decode-query: no

           #- iis7:
           #    address:
           #      - 192.168.0.0/24
           #      - 192.168.10.0/24
           #    personality: IIS_7_0
           #    # Can be specified in kb, mb, gb.  Just a number indicates
           #    # it's in bytes.
           #    request-body-limit: 4096
           #    response-body-limit: 4096
           #    double-decode-path: no
           #    double-decode-query: no

    # Note: Modbus probe parser is minimalist due to the limited usage in the field.
    # Only Modbus message length (greater than Modbus header length)
    # and protocol ID (equal to 0) are checked in probing parser
    # It is important to enable detection port and define Modbus port
    # to avoid false positives
    modbus:
      # How many unanswered Modbus requests are considered a flood.
      # If the limit is reached, the app-layer-event:modbus.flooded; will match.
      #request-flood: 500

      enabled: no
      detection-ports:
        dp: 502
      # According to MODBUS Messaging on TCP/IP Implementation Guide V1.0b, it
      # is recommended to keep the TCP connection opened with a remote device
      # and not to open and close it for each MODBUS/TCP transaction. In that
      # case, it is important to set the depth of the stream reassembling as
      # unlimited (stream.reassembly.depth: 0)

      # Stream reassembly size for modbus. By default track it completely.
      stream-depth: 0

    # DNP3
    dnp3:
      enabled: no
      detection-ports:
        dp: 20000

    # SCADA EtherNet/IP and CIP protocol support
    enip:
      enabled: no
      detection-ports:
        dp: 44818
        sp: 44818

    ntp:
      enabled: yes

    quic:
      enabled: yes

    dhcp:
      enabled: yes

    sip:
      #enabled: yes

# Limit for the maximum number of asn1 frames to decode (default 256)
asn1-max-frames: 256

# Datasets default settings
datasets:
  # Default fallback memcap and hashsize values for datasets in case these
  # were not explicitly defined.
  defaults:
    #memcap: 100mb
    #hashsize: 2048

  rules:
    # Set to true to allow absolute filenames and filenames that use
    # ".." components to reference parent directories in rules that specify
    # their filenames.
    #allow-absolute-filenames: false

    # Allow datasets in rules write access for "save" and
    # "state". This is enabled by default, however write access is
    # limited to the data directory.
    #allow-write: true

##############################################################################
##
## Advanced settings below
##
##############################################################################

##
## Run Options
##

# Run Suricata with a specific user-id and group-id:
run-as:
  user: suricata
  group: suricata

security:
  # if true, prevents process creation from Suricata by calling
  # setrlimit(RLIMIT_NPROC, 0)
  limit-noproc: true
  # Use landlock security module under Linux
  landlock:
    enabled: no
    directories:
      write:
        - /run
      # /usr and /etc folders are added to read list to allow
      # file magic to be used.
      read:
        - /usr/share/misc/magic.mgc
        - /usr/share/suricata
        - /var/ipfire/suricata
        - /var/lib/suricata

  lua:
    # Allow Lua rules. Disabled by default.
    #allow-rules: false

# Some logging modules will use that name in event as identifier. The default
# value is the hostname
#sensor-name: suricata

# Default location of the pid file. The pid file is only used in
# daemon mode (start Suricata with -D). If not running in daemon mode
# the --pidfile command line option must be used to create a pid file.
pid-file: /var/run/suricata.pid

# Daemon working directory
# Suricata will change directory to this one if provided
# Default: "/"
#daemon-directory: "/"

# Umask.
# Suricata will use this umask if it is provided. By default it will use the
# umask passed on by the shell.
#umask: 022

# Suricata core dump configuration. Limits the size of the core dump file to
# approximately max-dump. The actual core dump size will be a multiple of the
# page size. Core dumps that would be larger than max-dump are truncated. On
# Linux, the actual core dump size may be a few pages larger than max-dump.
# Setting max-dump to 0 disables core dumping.
# Setting max-dump to 'unlimited' will give the full core dump file.
# On 32-bit Linux, a max-dump value >= ULONG_MAX may cause the core dump size
# to be 'unlimited'.

coredump:
  max-dump: unlimited

# If the Suricata box is a router for the sniffed networks, set it to 'router'. If
# it is a pure sniffing setup, set it to 'sniffer-only'.
# If set to auto, the variable is internally switched to 'router' in IPS mode
# and 'sniffer-only' in IDS mode.
# This feature is currently only used by the reject* keywords.
host-mode: auto

# Number of packets preallocated per thread. The default is 1024. A higher number 
# will make sure each CPU will be more easily kept busy, but may negatively 
# impact caching.
#max-pending-packets: 1024

# Runmode the engine should use. Please check --list-runmodes to get the available
# runmodes for each packet acquisition method. Default depends on selected capture
# method. 'workers' generally gives best performance.
runmode: workers

# Specifies the kind of flow load balancer used by the flow pinned autofp mode.
#
# Supported schedulers are:
#
# hash     - Flow assigned to threads using the 5-7 tuple hash.
# ippair   - Flow assigned to threads using addresses only.
# ftp-hash - Flow assigned to threads using the hash, except for FTP, so that
#            ftp-data flows will be handled by the same thread
#
#autofp-scheduler: hash

# Preallocated size for each packet. Default is 1514 which is the classical
# size for pcap on Ethernet. You should adjust this value to the highest
# packet size (MTU + hardware header) on your system.
#default-packet-size: 1514

# Unix command socket that can be used to pass commands to Suricata.
# An external tool can then connect to get information from Suricata
# or trigger some modifications of the engine. Set enabled to yes
# to activate the feature. In auto mode, the feature will only be
# activated in live capture mode. You can use the filename variable to set
# the file name of the socket.
unix-command:
  enabled: no
  #filename: custom.socket

# Magic file
magic-file: /usr/share/misc/magic.mgc

legacy:
  uricontent: enabled

##
## Detection settings
##

# Set the order of alerts based on actions
# The default order is pass, drop, reject, alert
# action-order:
#   - pass
#   - drop
#   - reject
#   - alert

# Define maximum number of possible alerts that can be triggered for the same
# packet. Default is 15
#packet-alert-max: 15

# Exception Policies
#
# Define a common behavior for all exception policies.
# In IPS mode, the default is drop-flow. For cases when that's not possible, the
# engine will fall to drop-packet. To fallback to old behavior (setting each of
# them individually, or ignoring all), set this to ignore.
# All values available for exception policies can be used, and there is one
# extra option: auto - which means drop-flow or drop-packet (as explained above)
# in IPS mode, and ignore in IDS mode. Exception policy values are: drop-packet,
# drop-flow, reject, bypass, pass-packet, pass-flow, ignore (disable).
exception-policy: pass-packet

# When run with the option --engine-analysis, the engine will read each of
# the parameters below, and print reports for each of the enabled sections
# and exit.  The reports are printed to a file in the default log dir
# given by the parameter "default-log-dir", with engine reporting
# subsection below printing reports in its own report file.
engine-analysis:
  # enables printing reports for fast-pattern for every rule.
  rules-fast-pattern: yes
  # enables printing reports for each rule
  rules: yes

#recursion and match limits for PCRE where supported
pcre:
  match-limit: 3500
  match-limit-recursion: 1500

##
## Advanced Traffic Tracking and Reconstruction Settings
##

# Host specific policies for defragmentation and TCP stream
# reassembly. The host OS lookup is done using a radix tree, just
# like a routing table so the most specific entry matches.
host-os-policy:
  # Make the default policy windows.
  windows: [0.0.0.0/0]
  bsd: []
  bsd-right: []
  old-linux: []
  linux: []
  old-solaris: []
  solaris: []
  hpux10: []
  hpux11: []
  irix: []
  macos: []
  vista: []
  windows2k3: []

# Defrag settings:

# The memcap-policy value can be "drop-packet", "pass-packet", "reject" or
# "ignore" (which is the default).
defrag:
  memcap: 64mb
  # memcap-policy: ignore
  hash-size: 65536
  trackers: 65535 # number of defragmented flows to follow
  max-frags: 65535 # number of fragments to keep (higher than trackers)
  prealloc: yes
  timeout: 60

# Flow settings:
# By default, the reserved memory (memcap) for flows is 32MB. This is the limit
# for flow allocation inside the engine. You can change this value to allow
# more memory usage for flows.
# The hash-size determines the size of the hash used to identify flows inside
# the engine, and by default the value is 65536.
# At startup, the engine can preallocate a number of flows, to get better
# performance. The number of flows preallocated is 10000 by default.
# emergency-recovery is the percentage of flows that the engine needs to
# prune before clearing the emergency state. The emergency state is activated
# when the memcap limit is reached, allowing new flows to be created, but
# pruning them with the emergency timeouts (they are defined below).
# If the memcap is reached, the engine will try to prune flows
# with the default timeouts. If it doesn't find a flow to prune, it will set
# the emergency bit and it will try again with more aggressive timeouts.
# If that doesn't work, then it will try to kill the oldest flows using
# last time seen flows.
# The memcap can be specified in kb, mb, gb.  Just a number indicates it's
# in bytes.
# The memcap-policy can be "drop-packet", "pass-packet", "reject" or "ignore"
# (which is the default).

flow:
  memcap: 256mb
  #memcap-policy: ignore
  hash-size: 65536
  prealloc: 10000
  emergency-recovery: 30
  #managers: 1 # default to one flow manager
  #recyclers: 1 # default to one flow recycler thread

# This option controls the use of VLAN ids in the flow (and defrag)
# hashing. Normally this should be enabled, but in some (broken)
# setups where both sides of a flow are not tagged with the same VLAN
# tag, we can ignore the VLAN id's in the flow hashing.
vlan:
  use-for-tracking: true

# This option controls the use of livedev ids in the flow (and defrag)
# hashing. This is enabled by default and should be disabled if
# multiple live devices are used to capture traffic from the same network
livedev:
  use-for-tracking: true

# Specific timeouts for flows. Here you can specify the timeouts that the
# active flows will wait to transit from the current state to another, on each
# protocol. The value of "new" determines the seconds to wait after a handshake or
# stream startup before the engine frees the data of that flow it doesn't
# change the state to established (usually if we don't receive more packets
# of that flow). The value of "established" is the amount of
# seconds that the engine will wait to free the flow if that time elapses
# without receiving new packets or closing the connection. "closed" is the
# amount of time to wait after a flow is closed (usually zero). "bypassed"
# timeout controls locally bypassed flows. For these flows we don't do any other
# tracking. If no packets have been seen after this timeout, the flow is discarded.
#
# There's an emergency mode that will become active under attack circumstances,
# making the engine to check flow status faster. This configuration variables
# use the prefix "emergency-" and work similar as the normal ones.
# Some timeouts doesn't apply to all the protocols, like "closed", for udp and
# icmp.

flow-timeouts:

  default:
    new: 30
    established: 300
    closed: 0
    bypassed: 100
    emergency-new: 10
    emergency-established: 100
    emergency-closed: 0
    emergency-bypassed: 50
  tcp:
    new: 60
    established: 600
    closed: 60
    bypassed: 100
    emergency-new: 5
    emergency-established: 100
    emergency-closed: 10
    emergency-bypassed: 50
  udp:
    new: 30
    established: 300
    bypassed: 100
    emergency-new: 10
    emergency-established: 100
    emergency-bypassed: 50
  icmp:
    new: 30
    established: 300
    bypassed: 100
    emergency-new: 10
    emergency-established: 100
    emergency-bypassed: 50

# Stream engine settings. Here the TCP stream tracking and reassembly
# engine is configured.
#
# stream:
#   memcap: 64mb                # Can be specified in kb, mb, gb.  Just a
#                               # number indicates it's in bytes.
#   memcap-policy: ignore       # Can be "drop-flow", "pass-flow", "bypass",
#                               # "drop-packet", "pass-packet", "reject" or
#                               # "ignore" default is "ignore"
#   checksum-validation: yes    # To validate the checksum of received
#                               # packet. If csum validation is specified as
#                               # "yes", then packets with invalid csum values will not
#                               # be processed by the engine stream/app layer.
#                               # Warning: locally generated traffic can be
#                               # generated without checksum due to hardware offload
#                               # of checksum. You can control the handling of checksum
#                               # on a per-interface basis via the 'checksum-checks'
#                               # option
#   prealloc-sessions: 2048     # 2k sessions prealloc'd per stream thread
#   midstream: false            # don't allow midstream session pickups
#   midstream-policy: ignore    # Can be "drop-flow", "pass-flow", "bypass",
#                               # "drop-packet", "pass-packet", "reject" or
#                               # "ignore" default is "ignore"
#   async-oneside: false        # don't enable async stream handling
#   inline: no                  # stream inline mode
#   drop-invalid: yes           # in inline mode, drop packets that are invalid with regards to streaming engine
#   max-syn-queued: 10          # Max different SYNs to queue
#   max-synack-queued: 5        # Max different SYN/ACKs to queue
#   bypass: no                  # Bypass packets when stream.reassembly.depth is reached.
#                               # Warning: first side to reach this triggers
#                               # the bypass.
#   liberal-timestamps: false   # Treat all timestamps as if the Linux policy applies. This
#                               # means it's slightly more permissive. Enabled by default.
#
#   reassembly:
#     memcap: 256mb             # Can be specified in kb, mb, gb.  Just a number
#                               # indicates it's in bytes.
#     memcap-policy: ignore     # Can be "drop-flow", "pass-flow", "bypass",
#                               # "drop-packet", "pass-packet", "reject" or
#                               # "ignore" default is "ignore"
#     depth: 1mb                # Can be specified in kb, mb, gb.  Just a number
#                               # indicates it's in bytes.
#     toserver-chunk-size: 2560 # inspect raw stream in chunks of at least
#                               # this size.  Can be specified in kb, mb,
#                               # gb.  Just a number indicates it's in bytes.
#     toclient-chunk-size: 2560 # inspect raw stream in chunks of at least
#                               # this size.  Can be specified in kb, mb,
#                               # gb.  Just a number indicates it's in bytes.
#     randomize-chunk-size: yes # Take a random value for chunk size around the specified value.
#                               # This lowers the risk of some evasion techniques but could lead
#                               # to detection change between runs. It is set to 'yes' by default.
#     randomize-chunk-range: 10 # If randomize-chunk-size is active, the value of chunk-size is
#                               # a random value between (1 - randomize-chunk-range/100)*toserver-chunk-size
#                               # and (1 + randomize-chunk-range/100)*toserver-chunk-size and the same
#                               # calculation for toclient-chunk-size.
#                               # Default value of randomize-chunk-range is 10.
#
#     raw: yes                  # 'Raw' reassembly enabled or disabled.
#                               # raw is for content inspection by detection
#                               # engine.
#
#     segment-prealloc: 2048    # number of segments preallocated per thread
#
#     check-overlap-different-data: true|false
#                               # check if a segment contains different data
#                               # than what we've already seen for that
#                               # position in the stream.
#                               # This is enabled automatically if inline mode
#                               # is used or when stream-event:reassembly_overlap_different_data;
#                               # is used in a rule.
#
stream:
  memcap: 256mb
  prealloc-sessions: 4096
  #memcap-policy: ignore
  checksum-validation: yes      # reject incorrect csums
  midstream: true
  midstream-policy: pass-flow
  inline: auto                  # auto will use inline mode in IPS mode, yes or no set it statically
  bypass: yes                   # Bypass packets when stream.reassembly.depth is reached.
  reassembly:
    memcap: 256mb
    #memcap-policy: ignore
    depth: 1mb                  # reassemble 1mb into a stream
    toserver-chunk-size: 2560
    toclient-chunk-size: 2560
    randomize-chunk-size: yes
    #randomize-chunk-range: 10
    raw: yes
    segment-prealloc: 2048
    check-overlap-different-data: true

# Host table:
#
# Host table is used by the tagging and per host thresholding subsystems.
#
host:
  hash-size: 4096
  prealloc: 1000
  memcap: 32mb

# IP Pair table:
#
# Used by xbits 'ippair' tracking.
#
#ippair:
#  hash-size: 4096
#  prealloc: 1000
#  memcap: 32mb

# Decoder settings

decoder:
  # Teredo decoder is known to not be completely accurate
  # as it will sometimes detect non-teredo as teredo.
  teredo:
    enabled: false
    # ports to look for Teredo. Max 4 ports. If no ports are given, or
    # the value is set to 'any', Teredo detection runs on _all_ UDP packets.
    ports: $TEREDO_PORTS # syntax: '[3544, 1234]' or '3533' or 'any'.

  # VXLAN decoder is assigned to up to 4 UDP ports. By default only the
  # IANA assigned port 4789 is enabled.
  vxlan:
    enabled: true
    ports: $VXLAN_PORTS # syntax: '[8472, 4789]' or '4789'.

  # Geneve decoder is assigned to up to 4 UDP ports. By default only the
  # IANA assigned port 6081 is enabled.
  geneve:
    enabled: true
    ports: $GENEVE_PORTS # syntax: '[6081, 1234]' or '6081'.

  # maximum number of decoder layers for a packet
  # max-layers: 16

##
## Performance tuning and profiling
##

# The detection engine builds internal groups of signatures. The engine
# allows us to specify the profile to use for them, to manage memory in an
# efficient way keeping good performance. For the profile keyword you
# can use the words "low", "medium", "high" or "custom". If you use custom,
# make sure to define the values in the "custom-values" section.
# Usually you would prefer medium/high/low.
#
# "sgh mpm-context", indicates how the staging should allot mpm contexts for
# the signature groups.  "single" indicates the use of a single context for
# all the signature group heads.  "full" indicates a mpm-context for each
# group head.  "auto" lets the engine decide the distribution of contexts
# based on the information the engine gathers on the patterns from each
# group head.
#
# The option inspection-recursion-limit is used to limit the recursive calls
# in the content inspection code.  For certain payload-sig combinations, we
# might end up taking too much time in the content inspection code.
# If the argument specified is 0, the engine uses an internally defined
# default limit.  When a value is not specified, there are no limits on the recursion.
detect:
  profile: medium
  custom-values:
    toclient-groups: 3
    toserver-groups: 25
  sgh-mpm-context: auto
  inspection-recursion-limit: 3000
  # If set to yes, the loading of signatures will be made after the capture
  # is started. This will limit the downtime in IPS mode.
  delayed-detect: yes

  prefilter:
    # default prefiltering setting. "mpm" only creates MPM/fast_pattern
    # engines. "auto" also sets up prefilter engines for other keywords.
    # Use --list-keywords=all to see which keywords support prefiltering.
    default: mpm

  # the grouping values above control how many groups are created per
  # direction. Port whitelisting forces that port to get its own group.
  # Very common ports will benefit, as well as ports with many expensive
  # rules.
  grouping:
    #tcp-whitelist: 53, 80, 139, 443, 445, 1433, 3306, 3389, 6666, 6667, 8080
    #udp-whitelist: 53, 135, 5060

  profiling:
    # Log the rules that made it past the prefilter stage, per packet
    # default is off. The threshold setting determines how many rules
    # must have made it past pre-filter for that rule to trigger the
    # logging.
    #inspect-logging-threshold: 200
    grouping:
      dump-to-disk: false
      include-rules: false      # very verbose
      include-mpm-stats: false

# Select the multi pattern algorithm you want to run for scan/search the
# in the engine.
#
# The supported algorithms are:
# "ac"      - Aho-Corasick, default implementation
# "ac-bs"   - Aho-Corasick, reduced memory implementation
# "ac-ks"   - Aho-Corasick, "Ken Steele" variant
# "hs"      - Hyperscan, available when built with Hyperscan support
#
# The default mpm-algo value of "auto" will use "hs" if Hyperscan is
# available, "ac" otherwise.
#
# The mpm you choose also decides the distribution of mpm contexts for
# signature groups, specified by the conf - "detect.sgh-mpm-context".
# Selecting "ac" as the mpm would require "detect.sgh-mpm-context"
# to be set to "single", because of ac's memory requirements, unless the
# ruleset is small enough to fit in memory, in which case one can
# use "full" with "ac".  The rest of the mpms can be run in "full" mode.

mpm-algo: auto

# Select the matching algorithm you want to use for single-pattern searches.
#
# Supported algorithms are "bm" (Boyer-Moore) and "hs" (Hyperscan, only
# available if Suricata has been built with Hyperscan support).
#
# The default of "auto" will use "hs" if available, otherwise "bm".

spm-algo: auto

# Suricata is multi-threaded. Here the threading can be influenced.
threading:
  set-cpu-affinity: no
  # Tune cpu affinity of threads. Each family of threads can be bound
  # to specific CPUs.
  #
  # These 2 apply to the all runmodes:
  # management-cpu-set is used for flow timeout handling, counters
  # worker-cpu-set is used for 'worker' threads
  #
  # Additionally, for autofp these apply:
  # receive-cpu-set is used for capture threads
  # verdict-cpu-set is used for IPS verdict threads
  #
  cpu-affinity:
    - management-cpu-set:
        cpu: [ 0 ]  # include only these CPUs in affinity settings
    - receive-cpu-set:
        cpu: [ 0 ]  # include only these CPUs in affinity settings
    - worker-cpu-set:
        cpu: [ "all" ]
        mode: "exclusive"
        # Use explicitly 3 threads and don't compute number by using
        # detect-thread-ratio variable:
        # threads: 3
        prio:
          low: [ 0 ]
          medium: [ "1-2" ]
          high: [ 3 ]
          default: "medium"
    #- verdict-cpu-set:
    #    cpu: [ 0 ]
    #    prio:
    #      default: "high"
  #
  # By default Suricata creates one "detect" thread per available CPU/CPU core.
  # This setting allows controlling this behaviour. A ratio setting of 2 will
  # create 2 detect threads for each CPU/CPU core. So for a dual core CPU this
  # will result in 4 detect threads. If values below 1 are used, less threads
  # are created. So on a dual core CPU a setting of 0.5 results in 1 detect
  # thread being created. Regardless of the setting at a minimum 1 detect
  # thread will always be created.
  #
  detect-thread-ratio: 1.0
  #
  # By default, the per-thread stack size is left to its default setting. If
  # the default thread stack size is too small, use the following configuration
  # setting to change the size. Note that if any thread's stack size cannot be
  # set to this value, a fatal error occurs.
  #
  # Generally, the per-thread stack-size should not exceed 8MB.
  #stack-size: 8mb