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rate_filter: by_rule fixed triggering algorithm

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Fixes issue #2258

Program was triggering rate_filter by_rule earlier than needed
and generally behaved like a threshold.
pull/3183/head
Ruslan Usmanov 8 years ago committed by Victor Julien
parent d588237235
commit fb87d21ec7
2 changed files with 54 additions and 52 deletions
Show Stats Download Patch File Download Diff File

50
src/detect-engine-threshold.c
Unescape Escape View File

@ -227,13 +227,13 @@ DetectThresholdEntryAlloc(const DetectThresholdData *td, Packet *p,
if (unlikely(ste == NULL)) {
SCReturnPtr(NULL, "DetectThresholdEntry");
}
memset(ste, 0, sizeof(*ste));
ste->sid = sid;
ste->gid = gid;
ste->track = td->track;
ste->seconds = td->seconds;
ste->tv_timeout = 0;
SCReturnPtr(ste, "DetectThresholdEntry");
}
@ -614,43 +614,17 @@ static int ThresholdHandlePacketRule(DetectEngineCtx *de_ctx, Packet *p,
{
int ret = 0;
if (td->type != TYPE_RATE)
return 1;
DetectThresholdEntry* lookup_tsh = (DetectThresholdEntry *)de_ctx->ths_ctx.th_entry[s->num];
if (lookup_tsh != NULL) {
/* Check if we have a timeout enabled, if so,
* we still matching (and enabling the new_action) */
if ( (p->ts.tv_sec - lookup_tsh->tv_timeout) > td->timeout) {
/* Ok, we are done, timeout reached */
lookup_tsh->tv_timeout = 0;
} else {
/* Already matching */
/* Take the action to perform */
RateFilterSetAction(p, pa, td->new_action);
ret = 1;
}
SCLogDebug("by_rule lookup_tsh %p num %u", lookup_tsh, s->num);
/* Update the matching state with the timeout interval */
if ( (p->ts.tv_sec - lookup_tsh->tv_sec1) < td->seconds) {
lookup_tsh->current_count++;
if (lookup_tsh->current_count >= td->count) {
/* Then we must enable the new action by setting a
* timeout */
lookup_tsh->tv_timeout = p->ts.tv_sec;
/* Take the action to perform */
RateFilterSetAction(p, pa, td->new_action);
ret = 1;
}
} else {
lookup_tsh->tv_sec1 = p->ts.tv_sec;
lookup_tsh->current_count = 1;
}
} else {
if (td->count == 1) {
switch (td->type) {
case TYPE_RATE:
{
ret = 1;
if (lookup_tsh && IsThresholdReached(lookup_tsh, td, p->ts.tv_sec)) {
RateFilterSetAction(p, pa, td->new_action);
}
else if (!lookup_tsh) {
DetectThresholdEntry *e = DetectThresholdEntryAlloc(td, p, s->id, s->gid);
if (e != NULL) {
e->current_count = 1;
@ -660,6 +634,14 @@ static int ThresholdHandlePacketRule(DetectEngineCtx *de_ctx, Packet *p,
de_ctx->ths_ctx.th_entry[s->num] = e;
}
}
break;
}
default:
{
SCLogError(SC_ERR_INVALID_VALUE, "type %d is not supported", td->type);
break;
}
}
return ret;
}

44
src/util-threshold-config.c
Unescape Escape View File

@ -1276,8 +1276,7 @@ static FILE *SCThresholdConfGenerateValidDummyFD07(void)
}
/**
* \brief Creates a dummy threshold file, with all valid options, but
* with splitted rules (multiline), for testing purposes.
* \brief Creates a dummy threshold file, for testing rate_filter, track by_rule
*
* \retval fd Pointer to file descriptor.
*/
@ -1285,8 +1284,7 @@ static FILE *SCThresholdConfGenerateValidDummyFD08(void)
{
FILE *fd = NULL;
const char *buffer =
"rate_filter gen_id 1, sig_id 10, track by_rule, count 3, seconds 3, new_action drop, timeout 10\n"
"rate_filter gen_id 1, sig_id 11, track by_src, count 3, seconds 1, new_action drop, timeout 5\n";
"rate_filter gen_id 1, sig_id 10, track by_rule, count 3, seconds 3, new_action drop, timeout 10\n";
fd = SCFmemopen((void *)buffer, strlen(buffer), "r");
if (fd == NULL)
@ -1741,7 +1739,11 @@ static int SCThresholdConfTest10(void)
memset (&ts, 0, sizeof(struct timeval));
TimeGet(&ts);
Packet *p1 = UTHBuildPacket((uint8_t*)"lalala", 6, IPPROTO_TCP);
/* Create two different packets falling to the same rule, and
* because count:3, we should drop on match #4.
*/
Packet *p1 = UTHBuildPacketSrcDst((uint8_t*)"lalala", 6, IPPROTO_TCP,
"172.26.0.2", "172.26.0.11");
FAIL_IF_NULL(p1);
Packet *p2 = UTHBuildPacketSrcDst((uint8_t*)"lalala", 6, IPPROTO_TCP,
"172.26.0.1", "172.26.0.10");
@ -1767,26 +1769,44 @@ static int SCThresholdConfTest10(void)
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
TimeGet(&p1->ts);
p2->ts = p1->ts;
/* All should be alerted, none dropped */
SigMatchSignatures(&th_v, de_ctx, det_ctx, p1);
FAIL_IF(PacketAlertCheck(p1, 10));
FAIL_IF(PACKET_TEST_ACTION(p1, ACTION_DROP));
FAIL_IF(PacketAlertCheck(p1, 10) != 1);
p1->action = 0;
SigMatchSignatures(&th_v, de_ctx, det_ctx, p2);
FAIL_IF(PacketAlertCheck(p2, 10));
FAIL_IF(PACKET_TEST_ACTION(p2, ACTION_DROP));
FAIL_IF(PacketAlertCheck(p2, 10) != 1);
p2->action = 0;
SigMatchSignatures(&th_v, de_ctx, det_ctx, p1);
FAIL_IF_NOT(PacketAlertCheck(p1, 10) == 1);
FAIL_IF(PACKET_TEST_ACTION(p1, ACTION_DROP));
FAIL_IF(PacketAlertCheck(p1, 10) != 1);
p1->action = 0;
/* Match #4 should be dropped*/
SigMatchSignatures(&th_v, de_ctx, det_ctx, p2);
FAIL_IF_NOT(PACKET_TEST_ACTION(p2, ACTION_DROP));
FAIL_IF(PacketAlertCheck(p2, 10) != 1);
p2->action = 0;
TimeSetIncrementTime(2);
TimeGet(&p1->ts);
SigMatchSignatures(&th_v, de_ctx, det_ctx, p2);
FAIL_IF_NOT(PacketAlertCheck(p2, 10) == 1);
/* Still dropped because timeout not expired */
SigMatchSignatures(&th_v, de_ctx, det_ctx, p1);
FAIL_IF_NOT(PACKET_TEST_ACTION(p1, ACTION_DROP));
FAIL_IF(PacketAlertCheck(p1, 10) != 1);
p1->action = 0;
TimeSetIncrementTime(10);
TimeGet(&p1->ts);
/* Not dropped because timeout expired */
SigMatchSignatures(&th_v, de_ctx, det_ctx, p1);
FAIL_IF_NOT(PacketAlertCheck(p1, 10) == 0);
FAIL_IF(PACKET_TEST_ACTION(p1, ACTION_DROP));
FAIL_IF(PacketAlertCheck(p1, 10) != 1);
/* Ensure that a Threshold entry was installed at the sig */
FAIL_IF_NULL(de_ctx->ths_ctx.th_entry[s->num]);

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