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272 lines
9.9 KiB
ReStructuredText
272 lines
9.9 KiB
ReStructuredText
:tocdepth: 3
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base/frameworks/signatures/main.bro
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===================================
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.. bro:namespace:: Signatures
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Script level signature support. See the
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:doc:`signature documentation </frameworks/signatures>` for more
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information about Bro's signature engine.
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:Namespace: Signatures
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:Imports: :doc:`base/frameworks/notice </scripts/base/frameworks/notice/index>`
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Summary
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~~~~~~~
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Runtime Options
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###############
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=============================================================================== ===================================================================
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:bro:id:`Signatures::ignored_ids`: :bro:type:`pattern` :bro:attr:`&redef` Signature IDs that should always be ignored.
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:bro:id:`Signatures::summary_interval`: :bro:type:`interval` :bro:attr:`&redef` The interval between when :bro:enum:`Signatures::Signature_Summary`
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notices are generated.
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=============================================================================== ===================================================================
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Redefinable Options
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###################
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========================================================================================================================================== ====================================================================
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:bro:id:`Signatures::actions`: :bro:type:`table` :bro:attr:`&redef` :bro:attr:`&default` = ``Signatures::SIG_ALARM`` :bro:attr:`&optional` Actions for a signature.
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:bro:id:`Signatures::count_thresholds`: :bro:type:`set` :bro:attr:`&redef` Generate a notice if a :bro:enum:`Signatures::SIG_COUNT_PER_RESP`
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signature is triggered as often as given by one of these thresholds.
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:bro:id:`Signatures::horiz_scan_thresholds`: :bro:type:`set` :bro:attr:`&redef` Generate a notice if, for a pair [orig, signature], the number of
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different responders has reached one of the thresholds.
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:bro:id:`Signatures::vert_scan_thresholds`: :bro:type:`set` :bro:attr:`&redef` Generate a notice if, for a pair [orig, resp], the number of
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different signature matches has reached one of the thresholds.
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========================================================================================================================================== ====================================================================
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Types
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#####
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================================================ ======================================================================
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:bro:type:`Signatures::Action`: :bro:type:`enum` These are the default actions you can apply to signature matches.
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:bro:type:`Signatures::Info`: :bro:type:`record` The record type which contains the column fields of the signature log.
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================================================ ======================================================================
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Redefinitions
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#############
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========================================== ===========================================
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:bro:type:`Log::ID`: :bro:type:`enum` The signature logging stream identifier.
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:bro:type:`Notice::Type`: :bro:type:`enum` Add various signature-related notice types.
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========================================== ===========================================
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Events
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######
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====================================================== =================================================================
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:bro:id:`Signatures::log_signature`: :bro:type:`event` This event can be handled to access/alter data about to be logged
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to the signature logging stream.
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====================================================== =================================================================
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Detailed Interface
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~~~~~~~~~~~~~~~~~~
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Runtime Options
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###############
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.. bro:id:: Signatures::ignored_ids
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:Type: :bro:type:`pattern`
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:Attributes: :bro:attr:`&redef`
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:Default:
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::
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/(^?(^?(^webapp-)$?)$?)|(^?((^?(^?(traceroute-detector.*)$?)$?)|(^?(^?(NO_DEFAULT_MATCHES)$?)$?))$?)/
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Signature IDs that should always be ignored.
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.. bro:id:: Signatures::summary_interval
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:Type: :bro:type:`interval`
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:Attributes: :bro:attr:`&redef`
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:Default: ``1.0 day``
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The interval between when :bro:enum:`Signatures::Signature_Summary`
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notices are generated.
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Redefinable Options
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###################
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.. bro:id:: Signatures::actions
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:Type: :bro:type:`table` [:bro:type:`string`] of :bro:type:`Signatures::Action`
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:Attributes: :bro:attr:`&redef` :bro:attr:`&default` = ``Signatures::SIG_ALARM`` :bro:attr:`&optional`
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:Default:
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::
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{
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["unspecified"] = Signatures::SIG_IGNORE
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}
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Actions for a signature.
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.. bro:id:: Signatures::count_thresholds
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:Type: :bro:type:`set` [:bro:type:`count`]
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:Attributes: :bro:attr:`&redef`
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:Default:
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::
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{
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500,
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1000,
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1000000,
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5,
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100,
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50,
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10000,
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10
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}
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Generate a notice if a :bro:enum:`Signatures::SIG_COUNT_PER_RESP`
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signature is triggered as often as given by one of these thresholds.
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.. bro:id:: Signatures::horiz_scan_thresholds
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:Type: :bro:type:`set` [:bro:type:`count`]
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:Attributes: :bro:attr:`&redef`
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:Default:
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::
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{
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500,
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1000,
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5,
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100,
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50,
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10
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}
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Generate a notice if, for a pair [orig, signature], the number of
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different responders has reached one of the thresholds.
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.. bro:id:: Signatures::vert_scan_thresholds
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:Type: :bro:type:`set` [:bro:type:`count`]
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:Attributes: :bro:attr:`&redef`
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:Default:
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::
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{
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500,
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1000,
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5,
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100,
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50,
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10
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}
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Generate a notice if, for a pair [orig, resp], the number of
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different signature matches has reached one of the thresholds.
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Types
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#####
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.. bro:type:: Signatures::Action
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:Type: :bro:type:`enum`
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.. bro:enum:: Signatures::SIG_IGNORE Signatures::Action
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Ignore this signature completely (even for scan detection).
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Don't write to the signatures logging stream.
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.. bro:enum:: Signatures::SIG_QUIET Signatures::Action
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Process through the various aggregate techniques, but don't
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report individually and don't write to the signatures logging
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stream.
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.. bro:enum:: Signatures::SIG_LOG Signatures::Action
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Generate a notice.
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.. bro:enum:: Signatures::SIG_FILE_BUT_NO_SCAN Signatures::Action
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The same as :bro:enum:`Signatures::SIG_LOG`, but ignore for
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aggregate/scan processing.
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.. bro:enum:: Signatures::SIG_ALARM Signatures::Action
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Generate a notice and set it to be alarmed upon.
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.. bro:enum:: Signatures::SIG_ALARM_PER_ORIG Signatures::Action
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Alarm once per originator.
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.. bro:enum:: Signatures::SIG_ALARM_ONCE Signatures::Action
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Alarm once and then never again.
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.. bro:enum:: Signatures::SIG_COUNT_PER_RESP Signatures::Action
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Count signatures per responder host and alarm with the
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:bro:enum:`Signatures::Count_Signature` notice if a threshold
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defined by :bro:id:`Signatures::count_thresholds` is reached.
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.. bro:enum:: Signatures::SIG_SUMMARY Signatures::Action
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Don't alarm, but generate per-orig summary.
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These are the default actions you can apply to signature matches.
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All of them write the signature record to the logging stream unless
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declared otherwise.
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.. bro:type:: Signatures::Info
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:Type: :bro:type:`record`
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ts: :bro:type:`time` :bro:attr:`&log`
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The network time at which a signature matching type of event
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to be logged has occurred.
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uid: :bro:type:`string` :bro:attr:`&log` :bro:attr:`&optional`
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A unique identifier of the connection which triggered the
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signature match event.
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src_addr: :bro:type:`addr` :bro:attr:`&log` :bro:attr:`&optional`
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The host which triggered the signature match event.
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src_port: :bro:type:`port` :bro:attr:`&log` :bro:attr:`&optional`
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The host port on which the signature-matching activity
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occurred.
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dst_addr: :bro:type:`addr` :bro:attr:`&log` :bro:attr:`&optional`
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The destination host which was sent the payload that
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triggered the signature match.
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dst_port: :bro:type:`port` :bro:attr:`&log` :bro:attr:`&optional`
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The destination host port which was sent the payload that
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triggered the signature match.
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note: :bro:type:`Notice::Type` :bro:attr:`&log`
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Notice associated with signature event.
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sig_id: :bro:type:`string` :bro:attr:`&log` :bro:attr:`&optional`
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The name of the signature that matched.
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event_msg: :bro:type:`string` :bro:attr:`&log` :bro:attr:`&optional`
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A more descriptive message of the signature-matching event.
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sub_msg: :bro:type:`string` :bro:attr:`&log` :bro:attr:`&optional`
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Extracted payload data or extra message.
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sig_count: :bro:type:`count` :bro:attr:`&log` :bro:attr:`&optional`
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Number of sigs, usually from summary count.
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host_count: :bro:type:`count` :bro:attr:`&log` :bro:attr:`&optional`
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Number of hosts, from a summary count.
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The record type which contains the column fields of the signature log.
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Events
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######
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.. bro:id:: Signatures::log_signature
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:Type: :bro:type:`event` (rec: :bro:type:`Signatures::Info`)
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This event can be handled to access/alter data about to be logged
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to the signature logging stream.
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:rec: The record of signature data about to be logged.
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