Ticket: 7615
Avoids signatures setting extreme hash sizes, which would lead to very
high memory use.
Default to allowing:
- 65536 per dataset
- 16777216 total
To override these built-in defaults:
```yaml
datasets:
# Limits for per rule dataset instances to avoid rules using too many
# resources.
limits:
# Max value for per dataset `hashsize` setting
#single-hashsize: 65536
# Max combined hashsize values for all datasets.
#total-hashsizes: 16777216
```
AF_PACKET needs more information about its configuration before we can
set the default packet size, so on startup, leave unset in suricata.c
if in AF_PACKET mode.
If defrag is enabled, use a default packet size of 9k for tpacket-v2.
This can still lead to truncation events, then the user can increase
their 'default-packet-size'.
Tpacket-v3 does not need an increased packet size as it will handle
any size of packet that is smaller than the configured block size
which now has a default of 128k.
9k for the snap is somewhat arbitrary but is large enough for the
common 9000 jumbo frame plus some extra headers including tpacket
headers.
Ticket: #7458
If using tpacket-v2, defrag and a user provided v2-block-size, warn if
the block size is not large enough to hold one fully defragmented
packet.
Ticket: #7458
With the change of the default tpacket-v2 block size from 32k to 128k,
allow it to be configurable for users who may want to make it larger,
or revert it back to the pre 7.0.9 default of 32k.
Ticket: #7458
AF_PACKET defrag should not be used for inline modes. Its possible that
a packet received could be larger than can be set when defrag is
enabled, so warn if disabled for inline use.
Likewise, warn if defrag is disabled for IDS use, or non-inline mode.
Ticket: #7458
If cluster-type was not set we default to "cluster_flow" with defrag
always on. Instead check for defrag value and disable defrag if disabled
by the user.
Ticket: #7458
Ticket: 7613
Avoids potential large per-thread memory allocation. A buffer with the
size of the largest decode_base64 buffer size setting would be allocated
per thread. As this was a u32, it could mean a per-thread 4GiB memory
allocation.
64KiB was already the built-in default for cases where bytes size wasn't
specified.
Ticket: 7526
The usage of negated pcre, followed by other relative payload
content keywords could lead to an infinite loop.
This is because regular (not negated) pcre can test multiple
occurences, but negated pcre should be tried only once.
We were mentioning "Suricata Support" page, which could be a bit
misleading -- and also used a link that is actually redirected to the
Suricata Community page, anyways.
Issue: 6855: Match sigmatch type field in var and bit structs
Align the size and datatype of type, idx, and next members across:
- FlowVarThreshold
- FlowBit
- FlowVar
- GenericVar
- XBit
- DetectVarList
Note that the FlowVar structure has been intentionally constrained to
match the structure size prior to this commit. To achieve this, the
keylen member was restricted to 8 bits after it was confirmed its value
is checked against a max of 0xff.
Ticket: 7552
f->sgh_toserver may be NULL but because FLOW_SGH_TOSERVER is unset
and thus, we want to delay cleanup until detection has really been
run with the right signature group head.
This may happen for a rule using
`alert tcp any any -> any any` and
a app-layer keyword to client
with a app-layer supporting both udp and tcp
with stream.midstream=true
and with the first packet of a flow being a server response
In this case, we swap the flow and reset its signature group heads
Ticket: 7552
When we use midstream, and the first packet we see of a flow is
a response from server, and we want to match on some signature
to client :
- we had first set sgh_toserver/FLOW_SGH_TOSERVER as we first
thought this was a packet to server
- we then swap/reverse the flow, so sgh_toclient becomes sgh_toserver
but it contains signatures to server and cannot match our
to_client signature
The detect engine with DetectRunSetup will set again the
signatures group heads properly
Philippe Antoine
Victor Julien
Jason Ish
Shivani Bhardwaj
Juliana Fajardini
Bryan Benson
Jeff Lucovsky