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26290bb56c
- Moved some of the weird events back to the base/ directory. - Fixed more bugs with SSL certificate handling.
61 lines
2.5 KiB
Text
61 lines
2.5 KiB
Text
##! This script can be used to generate notices when X.509 certificates over
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##! SSL/TLS are expired or going to expire based on the date and time values
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##! stored within the certificate.
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@load base/protocols/ssl
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@load base/frameworks/notice
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@load base/utils/directions-and-hosts
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@load protocols/ssl/cert-hash
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module SSL;
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export {
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redef enum Notice::Type += {
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## Indicates that a certificate's NotValidAfter date has lapsed and
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## the certificate is now invalid.
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Certificate_Expired,
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## Indicates that a certificate is going to expire within
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## :bro:id:`SSL::notify_when_cert_expiring_in`.
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Certificate_Expires_Soon,
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## Indicates that a certificate's NotValidBefore date is future dated.
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Certificate_Not_Valid_Yet,
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};
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## The category of hosts you would like to be notified about which have
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## certificates that are going to be expiring soon. By default, these
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## notices will be suppressed by the notice framework for 1 day.
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## Choices are: LOCAL_HOSTS, REMOTE_HOSTS, ALL_HOSTS, NO_HOSTS
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const notify_certs_expiration = LOCAL_HOSTS &redef;
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## The time before a certificate is going to expire that you would like to
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## start receiving :bro:enum:`Certificate_Expires_Soon` notices.
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const notify_when_cert_expiring_in = 30days &redef;
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}
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event x509_certificate(c: connection, cert: X509, is_server: bool, chain_idx: count, chain_len: count, der_cert: string) &priority=3
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{
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# If this isn't the host cert or we aren't interested in the server, just return.
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if ( chain_idx != 0 ||
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! c$ssl?$cert_hash ||
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! addr_matches_host(c$id$resp_h, notify_certs_expiration) )
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return;
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if ( cert$not_valid_before > network_time() )
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NOTICE([$note=Certificate_Not_Valid_Yet,
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$conn=c, $suppress_for=1day,
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$msg=fmt("Certificate %s isn't valid until %T", cert$subject, cert$not_valid_before),
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$identifier=cat(c$id$resp_h, c$id$resp_p, c$ssl$cert_hash)]);
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else if ( cert$not_valid_after < network_time() )
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NOTICE([$note=Certificate_Expired,
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$conn=c, $suppress_for=1day,
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$msg=fmt("Certificate %s expired at %T", cert$subject, cert$not_valid_after),
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$identifier=cat(c$id$resp_h, c$id$resp_p, c$ssl$cert_hash)]);
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else if ( cert$not_valid_after - notify_when_cert_expiring_in < network_time() )
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NOTICE([$note=Certificate_Expires_Soon,
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$msg=fmt("Certificate %s is going to expire at %T", cert$subject, cert$not_valid_after),
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$conn=c, $suppress_for=1day,
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$identifier=cat(c$id$resp_h, c$id$resp_p, c$ssl$cert_hash)]);
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}
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