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Fuzz protodetect sip 7435 v1 #12232

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647f92d
fuzz: better init for protocol detection
catenacyber Oct 29, 2024
029bf34
fuzz: simplify target for protocol detection
catenacyber Oct 29, 2024
ebbdf2f
sip: remove UPDATE method for detection
catenacyber Oct 29, 2024
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11 changes: 10 additions & 1 deletion rust/src/sip/sip.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -496,7 +496,6 @@ fn register_pattern_probe(proto: u8) -> i8 {
"ACK\0",
"BYE\0",
"CANCEL\0",
"UPDATE\0",
"REFER\0",
"PRACK\0",
"SUBSCRIBE\0",
Expand Down Expand Up @@ -526,6 +525,16 @@ fn register_pattern_probe(proto: u8) -> i8 {
0,
core::Direction::ToClient as u8,
);
if proto == core::IPPROTO_UDP {
r |= AppLayerProtoDetectPMRegisterPatternCS(
proto,
ALPROTO_SIP,
"UPDATE\0".as_ptr() as *const std::os::raw::c_char,
"UPDATE".len() as u16,
0,
core::Direction::ToServer as u8,
);
}
}

if r == 0 {
Expand Down
33 changes: 3 additions & 30 deletions src/tests/fuzz/fuzz_applayerprotodetectgetproto.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
#include "suricata.h"
#include "app-layer-detect-proto.h"
#include "flow-util.h"
#include "app-layer-parser.h"
#include "app-layer.h"
#include "util-unittest-helper.h"
#include "conf-yaml-loader.h"

Expand All @@ -30,8 +30,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
Flow *f;
TcpSession ssn;
bool reverse;
AppProto alproto;
AppProto alproto2;

if (alpd_tctx == NULL) {
//global init
Expand All @@ -43,9 +41,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
MpmTableSetup();
SpmTableSetup();
EngineModeSetIDS();
AppLayerProtoDetectSetup();
AppLayerParserSetup();
AppLayerParserRegisterProtocolParsers();
AppLayerSetup();
alpd_tctx = AppLayerProtoDetectGetCtxThread();
SC_ATOMIC_SET(engine_stage, SURICATA_RUNTIME);
}
Expand All @@ -68,31 +64,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
if (data[0] & STREAM_TOSERVER) {
flags = STREAM_TOSERVER;
}
alproto = AppLayerProtoDetectGetProto(
AppLayerProtoDetectGetProto(
alpd_tctx, f, data + HEADER_LEN, size - HEADER_LEN, f->proto, flags, &reverse);
if (alproto != ALPROTO_UNKNOWN && alproto != ALPROTO_FAILED && f->proto == IPPROTO_TCP) {
/* If we find a valid protocol at the start of a stream :
* check that with smaller input
* we find the same protocol or ALPROTO_UNKNOWN.
* Otherwise, we have evasion with TCP splitting
*/
for (size_t i = 0; i < size-HEADER_LEN && i < PROTO_DETECT_MAX_LEN; i++) {
// reset detection at each try cf probing_parser_toserver_alproto_masks
AppLayerProtoDetectReset(f);
alproto2 = AppLayerProtoDetectGetProto(
alpd_tctx, f, data + HEADER_LEN, i, f->proto, flags, &reverse);
if (alproto2 != ALPROTO_UNKNOWN && alproto2 != alproto) {
printf("Failed with input length %" PRIuMAX " versus %" PRIuMAX
", found %s instead of %s\n",
(uintmax_t)i, (uintmax_t)size - HEADER_LEN, AppProtoToString(alproto2),
AppProtoToString(alproto));
printf("Assertion failure: %s-%s\n", AppProtoToString(alproto2),
AppProtoToString(alproto));
fflush(stdout);
abort();
}
}
}
FlowFree(f);

return 0;
Expand Down