detect: don't run pkt sigs on ffr pkts #12258
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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.
This was referenced Dec 10, 2024
Closed
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #12258 +/- ##
=======================================
Coverage 83.21% 83.22%
=======================================
Files 912 912
Lines 257183 257185 +2
=======================================
+ Hits 214025 214037 +12
+ Misses 43158 43148 -10
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catenacyber
approved these changes
Dec 10, 2024
|
WARNING:
Pipeline 23772 |
jasonish
approved these changes
Dec 10, 2024
Merged
|
Merged in #12259 |
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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:
Then a packet rule matches:
The
SIG_MASK_REQUIRE_REAL_PKTis not preventing the match, as theflowbitskeyword doesn't set it.To avoid this match. This patch skips signatures of the
SIG_TYPE_PKTfor flow end packets.Ticket: #7318.
SV_BRANCH=OISF/suricata-verify#2174