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This is based on commit 2731def9159247e6da8a3191783c89683363689c from the zeek-docs repo.
52 lines
3.5 KiB
ReStructuredText
52 lines
3.5 KiB
ReStructuredText
:tocdepth: 3
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policy/files/x509/disable-certificate-events-known-certs.zeek
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=============================================================
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.. zeek:namespace:: DisableX509Events
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This script disables repeat certificate events for hosts for hosts for which the same
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certificate was seen in the recent past;
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This script specifically plugs into the event caching mechanism that is set up by the
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base X509 script certificate-event-cache.zeek. It adds another layer of tracking that
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checks if the same certificate was seen for the server IP address before, when the same
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SNI was used to connect. If the certificate is in the event cache and all of these conditions
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apply, then no certificate related events will be raised.
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Please note that while this optimization can lead to a considerable reduction of load in some
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settings, it also means that certain detection scripts that rely on the certificate events being
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raised do no longer work - since the events will not be raised for all connections.
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Currently this script only works for X509 certificates that are sent via SSL/TLS connections.
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If you use any script that requires certificate events for each single connection,
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you should not load this script.
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:Namespace: DisableX509Events
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:Imports: :doc:`base/files/x509 </scripts/base/files/x509/index>`, :doc:`base/protocols/ssl </scripts/base/protocols/ssl/index>`
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Summary
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~~~~~~~
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Redefinitions
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#############
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====================================================================================== ==================================================================================================
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:zeek:type:`SSL::Info`: :zeek:type:`record`
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:New Fields: :zeek:type:`SSL::Info`
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always_raise_x509_events: :zeek:type:`bool` :zeek:attr:`&default` = ``F`` :zeek:attr:`&optional`
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Set to true to force certificate events to always be raised for this connection.
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:zeek:type:`X509::Info`: :zeek:type:`record`
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:New Fields: :zeek:type:`X509::Info`
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always_raise_x509_events: :zeek:type:`bool` :zeek:attr:`&default` = ``F`` :zeek:attr:`&optional`
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Set to true to force certificate events to always be raised for this certificate.
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:zeek:id:`X509::certificate_cache_max_entries`: :zeek:type:`count` :zeek:attr:`&redef` Let's be a bit more generous with the number of certificates that we allow to be put into
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the cache.
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====================================================================================== ==================================================================================================
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Detailed Interface
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~~~~~~~~~~~~~~~~~~
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