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e58b03a43f
The added disable-certificate-events-known-certs.zeek disables repeated X509 events in SSL connections, given that the connection terminates at the same server and used the samt SNI as a previously seen connection with the same certificate. For people that see significant amounts of TLS 1.2 traffic, this could reduce the amount of raised events significantly - especially when a lot of connections are repeat connections to the same servers. The practical impact of not raising these events is actually very little - unless a script directly interacts with the x509 events, everything works as before - the x509 variables in the connection records are still being set (from the cache).
46 lines
1.3 KiB
Text
46 lines
1.3 KiB
Text
# @TEST-EXEC: zeek -b -C -r $TRACES/tls/google-cert-repeat.pcap common.zeek %INPUT
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# @TEST-EXEC: btest-diff ssl.log
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# @TEST-EXEC: btest-diff x509.log
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# @TEST-EXEC: btest-diff .stdout
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@TEST-START-FILE common.zeek
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@load base/protocols/ssl
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@load protocols/ssl/validate-certs.zeek
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event x509_certificate(f: fa_file, cert_ref: opaque of x509, cert: X509::Certificate)
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{
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print "x509_certificate", cert$subject;
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}
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hook SSL::ssl_finishing(c: connection)
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{
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print "finishing", c$ssl$cert_chain[0]$x509$certificate$subject;
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}
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hook X509::x509_certificate_cache_replay(f: fa_file, e: X509::Info, sha256: string) &priority=5
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{
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print "Hook for", e$certificate$subject;
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}
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@TEST-END-FILE
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# First: Plain, no changes - certificate event caching won't even engage.
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# @TEST-START-NEXT
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# Second - engage certificate caching.
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# Log files and events are unchanged - but the replay hook engages
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redef X509::caching_required_encounters = 1;
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redef X509::certificate_cache_minimum_eviction_interval = 11min;
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# @TEST-START-NEXT
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# Third - load policy script to not raise events
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# Log files are unchanged; events are not raised from the third time.
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redef X509::caching_required_encounters = 1;
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redef X509::certificate_cache_minimum_eviction_interval = 11min;
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@load policy/files/x509/disable-certificate-events-known-certs
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