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This option indicates that the Teredo analyzer should wait until it sees both sides of a connection using a valid Teredo encapsulation before issuing a protocol_confirmation. Previous behavior confirmed on the first instance of a valid encapsulation, which could result in more false positives (and e.g. bogus entries in known-services.log). Addresses #890.
50 lines
1.7 KiB
Text
50 lines
1.7 KiB
Text
# @TEST-EXEC: bro -r $TRACES/tunnels/false-teredo.pcap %INPUT >output
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# @TEST-EXEC: test ! -e weird.log
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# @TEST-EXEC: test ! -e dpd.log
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# @TEST-EXEC: bro -r $TRACES/tunnels/false-teredo.pcap %INPUT Tunnel::yielding_teredo_decapsulation=F >output
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# @TEST-EXEC: btest-diff weird.log
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# @TEST-EXEC: test ! -e dpd.log
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# In the first case, there isn't any weird or protocol violation logged
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# since the teredo analyzer recognizes that the DNS analyzer has confirmed
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# the protocol and yields.
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# In the second case, there are weirds since the teredo analyzer decapsulates
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# despite the presence of the confirmed DNS analyzer and the resulting
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# inner packets are malformed (no surprise there). There's also no dpd.log
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# since the teredo analyzer doesn't confirm until it's seen a valid teredo
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# encapsulation in both directions and protocol violations aren't logged
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# until there's been a confirmation.
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# In either case, the analyzer doesn't, by default, get disabled as a result
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# of the protocol violations.
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function print_teredo(name: string, outer: connection, inner: teredo_hdr)
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{
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print fmt("%s: %s", name, outer$id);
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print fmt(" ip6: %s", inner$hdr$ip6);
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if ( inner?$auth )
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print fmt(" auth: %s", inner$auth);
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if ( inner?$origin )
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print fmt(" origin: %s", inner$origin);
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}
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event teredo_packet(outer: connection, inner: teredo_hdr)
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{
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print_teredo("packet", outer, inner);
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}
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event teredo_authentication(outer: connection, inner: teredo_hdr)
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{
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print_teredo("auth", outer, inner);
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}
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event teredo_origin_indication(outer: connection, inner: teredo_hdr)
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{
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print_teredo("origin", outer, inner);
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}
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event teredo_bubble(outer: connection, inner: teredo_hdr)
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{
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print_teredo("bubble", outer, inner);
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}
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