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Last packet from the TLS TCP session moves TCP state to CLOSED.
This flags the app-layer with APP_LAYER_PARSER_EOF_TS or
APP_LAYER_PARSER_EOF_TC depending on the direction of the final packet.
This flag will just have been set in a single direction.
This leads to the last packet updating the inspect id in that packets
direction.
At the end of the TLS session a pseudo packet is created, because:
- flow has ended
- inspected tx id == 0, for at least one direction
- total txs is 1
Then a packet rule matches:
```
alert tcp any any -> any 443 (flow: to_server; \
flowbits:isset,tls_error; \
sid:09901033; rev:1; \
msg:"Allow TLS error handling (outgoing packet)"; )
```
The `SIG_MASK_REQUIRE_REAL_PKT` is not preventing the match, as the
`flowbits` keyword doesn't set it.
To avoid this match. This patch skips signatures of the `SIG_TYPE_PKT`
for flow end packets.
Ticket: OISF#7318.
(cherry picked from commit 0e4faba)
Ticket: 7199 Uses a config parameter detect.guess-applayer-tx to enable this behavior (off by default) This feature is requested for use cases with signatures not using app-layer keywords but still targetting application layer transactions, such as pass/drop rule combination, or lua usage. This overrides the previous behavior of checking if the signature has a content match, by checking if there is only one live transaction, in addition to the config parameter being set. (cherry picked from commit f2c3776)
The `guess-applayer-tx` work also removed the stream match condition for adding app-layer metadata to alerts. This is a behavior change that is not desired at this point, so this commit reverts that part of the changes. We keep the exising logging of app-layer metadata if the match was in the stream.
This was referenced Dec 11, 2024
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main-7.0.x #12268 +/- ##
==============================================
- Coverage 83.19% 83.18% -0.01%
==============================================
Files 922 922
Lines 260888 260900 +12
==============================================
- Hits 217048 217033 -15
- Misses 43840 43867 +27
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jufajardini
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Dec 11, 2024
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if we don't want to add anything about the stream matching rules still leading to logged metadata, looks good to me.
Comment on lines
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to
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| # try to tie an app-layer transaction for rules without app-layer keywords | ||
| # if there is only one live transaction for the flow | ||
| # allows to log app-layer metadata in alert | ||
| # but the transaction may not be the relevant one. | ||
| # guess-applayer-tx: no |
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Just noticed we're going against our own guidelines of using true / false in such options. To fix later...
jasonish
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Dec 11, 2024
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OK, netmap CI failure it intermittent.
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Merged in #12270, thanks! |
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replace #12267, add in #12264
SV_BRANCH=OISF/suricata-verify#2179