Victor Julien [Tue, 7 Apr 2020 05:01:59 +0000 (07:01 +0200)]
fuzz/sigpcap: initialize empty packet pool
Fixes runs with --enable-debug-validation. The target did not init a
packet pool, so for a tunnel packet would try to get a packet from
an uninitialized pool. In non-debug mode, this silently works by
falling back to a packet from alloc.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007ffff35a6801 in __GI_abort () at abort.c:79
#2 0x00007ffff359639a in __assert_fail_base (fmt=0x7ffff371d7d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x555557fe7260 "!(pool->initialized == 0)",
file=file@entry=0x555557fe7220 "tmqh-packetpool.c", line=line@entry=253, function=function@entry=0x555557fe7500 <__PRETTY_FUNCTION__.21181> "PacketPoolGetPacket") at assert.c:92
#3 0x00007ffff3596412 in __GI___assert_fail (assertion=0x555557fe7260 "!(pool->initialized == 0)", file=0x555557fe7220 "tmqh-packetpool.c", line=253,
function=0x555557fe7500 <__PRETTY_FUNCTION__.21181> "PacketPoolGetPacket") at assert.c:101
#4 0x00005555577e24be in PacketPoolGetPacket () at tmqh-packetpool.c:253
#5 0x0000555556914ecd in PacketGetFromQueueOrAlloc () at decode.c:183
#6 0x00005555569161e1 in PacketTunnelPktSetup (tv=0x555559863980 <tv>, dtv=0x614000068e40, parent=0x61e0000fc080, pkt=0x61e0000fc470 "LL", len=72, proto=DECODE_TUNNEL_IPV4) at decode.c:286
#7 0x00005555569de694 in DecodeIPv4inIPv6 (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc470 "LL", plen=72) at decode-ipv6.c:59
#8 0x00005555569e60b5 in DecodeIPV6ExtHdrs (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc470 "LL", len=112) at decode-ipv6.c:522
#9 0x00005555569e846f in DecodeIPV6 (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc420 "cLL", len=255) at decode-ipv6.c:641
#10 0x0000555556a032f9 in DecodeRaw (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc420 "cLL", len=255) at decode-raw.c:70
#11 0x0000555557659ba8 in DecodePcapFile (tv=0x555559863980 <tv>, p=0x61e0000fc080, data=0x614000068e40) at source-pcap-file.c:412
#12 0x0000555556573401 in LLVMFuzzerTestOneInput (data=0x613000000047 "\241\262\315\064", size=339) at tests/fuzz/fuzz_sigpcap.c:158
#13 0x0000555557a4dc66 in main (argc=2, argv=0x7fffffffdfa8) at tests/fuzz/onefile.c:51
Todd Mortimer [Mon, 30 Mar 2020 23:47:47 +0000 (23:47 +0000)]
detect/threshold: Add a common function to (re)allocate the by_rule threshold table.
Ensure that the by_rule threshold table is initialized if a rule
is thresholded by_rule. Replace manual table reallocaton with calls
to the common function.
Todd Mortimer [Mon, 30 Mar 2020 23:45:50 +0000 (23:45 +0000)]
detect/threshold: Refactor threshold calculation to handle by_rule and by_both.
The only difference between threshold calculations for by_src/by_dst,
by_rule or by_both is which table stores the DetectThresholdEntry.
Refactor the ThresholdHandlePacket* functions to do table lookup and
storage individually, but calculate thresholds in a common function.
Jeff Lucovsky [Mon, 30 Mar 2020 15:01:59 +0000 (11:01 -0400)]
doc/devguide: Submission and style
This commit adds code submission and coding style guidelines to the
devguide. Most of the material is a straight port from the wiki but
there have been some content modifications and additions.
Eric Leblond [Fri, 7 Feb 2020 23:05:01 +0000 (00:05 +0100)]
app-layer-expectation: clean expectation at flow end
When a flow timeout, we can have still existing expectations that
are linked to this flow. Given that there is a delay between the
real ending of the flow and its destruction by Suricata, the
expectation should be already honored so we can assume the risk
to clean the expectations that have been triggered by the
to-be-deleted flow.
Eric Leblond [Fri, 7 Feb 2020 23:01:28 +0000 (00:01 +0100)]
app-layer-expectation: limit number of expectations
This patch introduces a limitation in term of number of
expectations attached to one IPPair. This is done using
a circle list so we have a FIFO approach on expectation
handling.
Circleq list code is copied from BSD code like was pre existing code
in queue.h.
Sascha Steinbiss [Sun, 29 Mar 2020 17:33:29 +0000 (19:33 +0200)]
rfb: make sure size calculations do not overflow
Addresses #3570 by extra checking of calculated size requests.
With the given input, the parser eventually arrived at
parser::parse_failure_reason() which parsed from the remaining four
bytes (describing the string length) that the failure string to follow
would be 4294967295 bytes long. While calculating the total size of the
data to request via AppLayerResult::incomplete(), adding the four bytes
for the parsed but not consumed string length caused the u32 length to
overflow, resulting in a much smaller value triggering the bug condition.
This problem was addressed by more careful checking of values in each step
that could overflow: one subtraction, one addition (which could overflow
the usize length values), and a final check to determine whether the result
still fit into the u32 values required by AppLayerResult::incomplete().
If so, we would safely convert the values and pass them to the result type.
If not, we simply return AppLayerResult::err() but do not erroneously and
silently request the wrong amount.
Victor Julien [Mon, 23 Mar 2020 10:06:55 +0000 (11:06 +0100)]
decode/teredo: implement port support
Implement support for limiting Teredo detection and decoding to specific
UDP ports, with 3544 as the default.
If no ports are specified, the old behaviour of detecting/decoding on any
port is still in place. This can also be forced by specifying 'any' as the
port setting.
Shivani Bhardwaj [Sun, 22 Dec 2019 16:58:54 +0000 (22:28 +0530)]
util: Add StringParse* functions
StringParse* functions would perform a stricter check compared to
ByteExtractString* functions. These new functions shall also check if
any extra characters follow the extracted numeric value in addition to
the checks performed by ByteExtractString* and return -1 in that case.
This is particularly important in parser, configuration and setup functions.
Frank Honza [Fri, 7 Feb 2020 12:22:17 +0000 (13:22 +0100)]
add RFB parser
This commit adds support for the Remote Framebuffer Protocol (RFB) as
used, for example, by various VNC implementations. It targets the
official versions 3.3, 3.7 and 3.8 of the protocol and provides logging
for the RFB handshake communication for now. Logged events include
endpoint versions, details of the security (i.e. authentication)
exchange as well as metadata about the image transfer parameters.
Detection is enabled using keywords for:
- rfb.name: Session name as sticky buffer
- rfb.sectype: Security type, e.g. VNC-style challenge-response
- rfb.secresult: Result of the security exchange, e.g. OK, FAIL, ...
The latter could be used, for example, to detect brute-force attempts
on open VNC servers, while the name could be used to map unwanted VNC
sessions to the desktop owners or machines.
We also ship example EVE-JSON output and keyword docs as part of the
Sphinx source for Suricata's RTD documentation.
Jeff Lucovsky [Mon, 18 Nov 2019 22:02:17 +0000 (17:02 -0500)]
detect/pcre: Changes to support pcre_jit_exec
This command causes `pcre_jit_exec` to be used when available. If it's
available and there are allocation errors preparing for it, things
fallback to `pcre_exec`.
Jeff Lucovsky [Wed, 18 Mar 2020 12:43:59 +0000 (08:43 -0400)]
detect/pcre: Add warning for failed registrations
This commit adds a warning used by the PCRE detect logic when it fails
to register initialization and free functions for per-thread JIT stack
handling.
This error code is only used when the platform has PCRE JIT exec
functionality.
Victor Julien [Tue, 17 Mar 2020 12:08:33 +0000 (13:08 +0100)]
stream: fix direction flags in corner case
When a TCP DNS flow would start with a GAP on the TS side, the successful
protocol detection on the TC side would trigger 'opposing side' reassembly
and app-layer processing. In this case the stream flags would indicate the
wrong direction and the wrong parser would be called.