Ken Steele [Mon, 3 Nov 2014 03:27:07 +0000 (22:27 -0500)]
Further optimize merging mpm and non-mpm rule ID lists.
When reaching the end of either list, merging is no longer required,
simply walk down the other list.
If the non-MPM list can't have duplicates, it would be worth removing
the duplicate check for the non-MPM list when it is the only non-empty list
remaining.
Ken Steele [Tue, 14 Oct 2014 21:24:14 +0000 (17:24 -0400)]
Create optimized sig_arrays from sig_lists
Create a copy of the SigMatch data in the sig_lists linked-lists and store
it in an array for faster access and not next and previous pointers. The
array is then used when calling the Match() functions.
Ken Steele [Tue, 14 Oct 2014 20:08:59 +0000 (16:08 -0400)]
Change Match() function to take const SigMatchCtx*
The Match functions don't need a pointer to the SigMatch object, just the
context pointer contained inside, so pass the Context to the Match function
rather than the SigMatch object. This allows for further optimization.
Change SigMatch->ctx to have type SigMatchCtx* rather than void* for better
type checking. This requires adding type casts when using or assigning it.
The SigMatch contex should not be changed by the Match() funciton, so pass it
as a const SigMatchCtx*.
Ken Steele [Mon, 6 Oct 2014 14:00:36 +0000 (10:00 -0400)]
Prefetch the next signature pointer
Read one signature pointer ahead to prefetch the value.
Use a variable, sflags, for s->flags, since it is used many times and the
compiles doesn't know that the signatures structure doesn't change, so it
will reload s->flags.
Ken Steele [Fri, 3 Oct 2014 21:12:06 +0000 (17:12 -0400)]
In AC-Tile, convert from using pids for indexing to pattern index
Use an MPM specific pattern index, which is simply an index starting
at zero and incremented for each pattern added to the MPM, rather than
the externally provided Pattern ID (pid), since that can be much
larger than the number of patterns. The Pattern ID is shared across at
MPMs. For example, an MPM with one pattern with pid=8000 would result
in a max_pid of 8000, so the pid_pat_list would have 8000 entries.
The pid_pat_list[] is replaced by a array of pattern indexes. The PID is
moved to the SCACTilePatternList as a single value. The PatternList is
also indexed by the Pattern Index.
max_pat_id is no longer needed and mpm_ctx->pattern_cnt is used instead.
The local bitarray is then also indexed by pattern index instead of PID, making
it much smaller. The local bit array sets a bit for each pattern found
for this MPM. It is only kept during one MPM search (stack allocated).
One note, the local bit array is checked first and if the pattern has already
been found, it will stop checking, but count a match. This could result in
over counting matches of case-sensitve matches, since following case-insensitive
matches will also be counted. For example, finding "Foo" in "foo Foo foo" would
report finding "Foo" 2 times, mis-counting the third word as "Foo".
Ken Steele [Thu, 6 Nov 2014 19:57:53 +0000 (14:57 -0500)]
Fix bug in MPM rule array handling
In PmqMerge() use MpmAddSids() instead of blindly copying the src
rule list onto the end of the dst rule list, since there might not
be enough room in the dst list. MpmAddSids() will resize the dst array
if needed.
Also add code to MpmAddSids() MpmAddPid() to better handle the case
that realloc fails to get more space. It first tries 2x the needed
space, but if that fails, it tries for just 1x. If that fails resize
returns 0. For MpmAddPid(), if resize fails, the new pid is lost. For
MpmAddSids(), as many SIDs as will fit are added, but some will be
lost.
Ken Steele [Fri, 3 Oct 2014 17:30:57 +0000 (13:30 -0400)]
Dynamically resize pmq->rule_id_array
Rather than statically allocate 64K entries in every rule_id_array,
increase the size only when needed. Created a new function MpmAddSids()
to check the size before adding the new sids. If the array is not large
enough, it calls MpmAddSidsResize() that calls realloc and does error
checking. If the realloc fails, it prints an error and drops the new sids
on the floor, which seems better than exiting Suricata.
The size is increased to (current_size + new_count) * 2. This handles the
case where new_count > current_size, which would not be handled by simply
using current_size * 2. It should also be faster than simply reallocing to
current_size + new_count, which would then require another realloc for each
new addition.
Victor Julien [Tue, 19 Aug 2014 13:09:59 +0000 (15:09 +0200)]
AC: use local bit array
Use a local pattern bit array to making sure we don't match more than
once, in addition to the pmq bitarray that is still used for results
validation higher up in the rule matching process.
Why: pmq->pattern_id_bitarray is currently sometimes used in a
'stateful' way, meaning that for a single packet we run multiple
MPM's on the same pmq w/o resetting it.
The new bitarray is used to determine wherther we need to append the
patterns associated 'sids' list to the pmq rule_id_array.
It has been observed that MPM1 matches for PAT1, and MPM2 matches for
PAT1 as well. However, in MPM1 PAT1 doesn't have the same sids list.
In this case MPM2 would not add it's sids to the list, leading to missed
detection.
Victor Julien [Mon, 18 Aug 2014 14:05:16 +0000 (16:05 +0200)]
detect: Add negated MPM to non-MPM array
Treat negated MPM sigs as if non-MPM, so we consider them always.
As MPM results and non-MPM rules lists are now merged and considered
for further inspection, rules that need to be considerd when a pattern
is absent are caught in the middle.
As a HACK/workaround this patch adds them to the non-MPM list. This
causes them to be inspected each time.
Victor Julien [Mon, 18 Aug 2014 11:51:40 +0000 (13:51 +0200)]
Detect: create per sgh non-MPM rule array
Array of rule id's that are not using MPM prefiltering. These will be
merged with the MPM results array. Together these should lead to a
list of all the rules that can possibly match.
Victor Julien [Mon, 18 Aug 2014 11:19:07 +0000 (13:19 +0200)]
MPM: build sid list from MPM matches
Pmq add rule list: Array of uint32_t's to store (internal) sids from the MPM.
AC: store sids in the pattern list, append to Pmq::rule_id_array on match.
Detect: sort rule_id_array after it was set up by the MPM. Rule id's
(Signature::num) are ordered, and the rule's with the lowest id are to
be inspected first. As the MPM doesn't fill the array in order, but instead
'randomly' we need this sort step to assure proper inspection order.
Ken Steele [Fri, 5 Sep 2014 21:14:34 +0000 (17:14 -0400)]
Create a wrapper around DetectFlowvarProcessList() to check for empty list
Creates an inline wrapper to check for flowvarlist == NULL before calling
DetectFlowvarProcessList() to remove the overhead of checking since the
list is usually empty.
Victor Julien [Wed, 14 Jan 2015 22:49:54 +0000 (23:49 +0100)]
Fix OS X 10.10 unittest failure
Work around OS X 10.10 Yosemite returning EDEADLK on a rwlock wrlocked
then tested by wrtrylock. All other OS' (and versions of OS X that I
tested) seem to return EBUSY instead.
Travis Green [Tue, 23 Dec 2014 22:10:21 +0000 (15:10 -0700)]
Update reference.config
Updated reference.config to match ET Open reference.config found here:
https://rules.emergingthreats.net/open/suricata/reference.config
Due to startup error shown here:
root@xxxxxxx01:/etc/suricata/rules# /usr/bin/suricata -c /etc/suricata/suricata.yaml --pidfile /var/run/suricata.pid --af-packet
23/12/2014 -- 22:07:56 - <Error> - [ERRCODE: SC_ERR_REFERENCE_UNKNOWN(150)] - unknown reference key "osvdb". Supported keys are defined in reference.config file. Please have a look at the conf param "reference-config-file"
<...>
Killed
Eric Leblond [Mon, 15 Dec 2014 23:14:59 +0000 (00:14 +0100)]
output-json: fix duplicate logging
This patches is fixing a issue in the OutputJSONBuffer function. It
was writing to file the content of the buffer starting from the start
to the final offset. But as the writing is done for each JSON string
we are duplicating the previous events if we are reusing the same
buffer.
Duplication was for example triggered when we have multiple alerts
attached to a packet. In the case of two alerts, the first one was
logged twice more as the second one.
Victor Julien [Mon, 1 Dec 2014 17:48:03 +0000 (18:48 +0100)]
flow-time: use live threads at shutdown
Update pktacq loop to process flow timeouts in a running engine.
Add a new step to the shutdown phase of packet acquisition loop
threads (pktacqloop).
The shutdown code lets the pktacqloop break out of it's packet
acquisition loop. The thread then enters a flow timeout loop, where
it processes packets from it's tv->stream_pq queue until it's
empty _and_ the KILL flag is set.
Make sure receive threads are done before moving on to flow hash
cleanup (recycle all). Without this the flow recycler could start
it's unconditional hash clean up while detect threads are still
running on the flows.
Duarte Silva [Fri, 5 Dec 2014 15:59:05 +0000 (15:59 +0000)]
Implemented the diferent behaviour depending on the proxy deployment
- In forward deployment mode the first IP will be returned
- In reverse deployment mode the last IP will be retuned
Duarte Silva [Fri, 5 Dec 2014 15:52:16 +0000 (15:52 +0000)]
Prepared everything for the proxy deployment configuration
- Added the suricata.yaml configurations and updated the comments
- Renamed the field in the configuration structure to something generic
- Added two new constants and the warning codes
Duarte Silva [Fri, 5 Dec 2014 15:40:58 +0000 (15:40 +0000)]
Adding XFF support to EVE alert output
- Created app-layer-htp-xff.c and app-layer-htp-xff.h
- Added entries in the Makefile.am
- Added the necessary configuration options to EVE alert section
- Updated Unified2 XFF configuration comments and removed unnecessary whitespace
- Created a generic function to parse the configuration
- Release the flow locks sooner and remove debug logging
- Added XFF support to EVE alert output
Ken Steele [Wed, 3 Dec 2014 20:55:22 +0000 (15:55 -0500)]
Fix memory leak in ac-tile
Incorrectly reallocing the goto table after it was freed by calling
SCACTileReallocState() when really only want to realloc the output table.
This was causing a large goto table to be allocated and never used or
freed.
Victor Julien [Fri, 5 Dec 2014 13:32:56 +0000 (14:32 +0100)]
Bug 1329: error out on invalid rule protocol
Due to a logic error in AppLayerProtoDetectGetProtoByName invalid
protocols would not be detected as such. Instead of ALPROTO_UNKNOWN
ALPROTO_MAX was returned.
Eric Leblond [Mon, 8 Dec 2014 13:49:16 +0000 (14:49 +0100)]
unix-manager: fix cppcheck errors
This patch fixes the following errors:
[src/unix-manager.c:306]: (error) Memory pointed to by 'client' is freed twice.
[src/unix-manager.c:313]: (error) Memory pointed to by 'client' is freed twice.
[src/unix-manager.c:323]: (error) Memory pointed to by 'client' is freed twice.
[src/unix-manager.c:334]: (error) Memory pointed to by 'client' is freed twice.
Unix manager was treating the packet after closing the socket if message was
too long.