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SSL: update dpd signature for TLS1.3

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The dpd signature missed a few cases that are used for TLS 1.3,
especially when draft versions (which are all that we are seeing at the
moment) are being negotiated.

This fix mostly allows draft versions in the server hello (identified by
7F[version]; since we do not know how many drafts there will be, we are
currently allowing a rather safe upper limit.
This commit is contained in:
Johanna Amann 2017-04-05 08:58:08 -07:00
parent 391685af73
commit 0cd0ffed13
4 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
scripts/base/protocols/ssl/dpd.sig
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@ -1,7 +1,7 @@
signature dpd_ssl_server {
ip-proto == tcp
# Server hello.
payload /^((\x15\x03[\x00\x01\x02\x03]....)?\x16\x03[\x00\x01\x02\x03]..\x02...\x03[\x00\x01\x02\x03]|...?\x04..\x00\x02).*/
payload /^((\x15\x03[\x00\x01\x02\x03]....)?\x16\x03[\x00\x01\x02\x03]..\x02...((\x03[\x00\x01\x02\x03\x04])|(\x7F[\x00-\x50]))|...?\x04..\x00\x02).*/
requires-reverse-signature dpd_ssl_client
enable "ssl"
tcp-state responder
@ -10,7 +10,7 @@ signature dpd_ssl_server {
signature dpd_ssl_client {
ip-proto == tcp
# Client hello.
payload /^(\x16\x03[\x00\x01\x02\x03]..\x01...\x03[\x00\x01\x02\x03]|...?\x01[\x00\x03][\x00\x01\x02\x03]).*/
payload /^(\x16\x03[\x00\x01\x02\x03]..\x01...\x03[\x00\x01\x02\x03]|...?\x01[\x00\x03][\x00\x01\x02\x03\x04]).*/
tcp-state originator
}

3
testing/btest/Baseline/scripts.base.protocols.ssl.dpd/.stdout
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@ -8,3 +8,6 @@ Start test run
Client hello, 10.0.0.80, 68.233.76.12, 771
Start test run
Client hello, 192.168.6.217, 67.207.128.99, 771
Start test run
Client hello, 192.168.6.240, 139.162.123.134, 771
Client hello, 192.168.6.240, 139.162.123.134, 771

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testing/btest/Traces/tls/tls-13draft19-early-data.pcap Normal file
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1
testing/btest/scripts/base/protocols/ssl/dpd.test
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@ -2,6 +2,7 @@
# @TEST-EXEC: bro -b -r $TRACES/tls/ssl.v3.trace %INPUT
# @TEST-EXEC: bro -b -r $TRACES/tls/tls1.2.trace %INPUT
# @TEST-EXEC: bro -b -r $TRACES/tls/tls-early-alert.trace %INPUT
# @TEST-EXEC: bro -b -r $TRACES/tls/tls-13draft19-early-data.pcap %INPUT
# @TEST-EXEC: btest-diff .stdout
@load base/frameworks/dpd