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/* Copyright (C) 2015 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file Set up of the "template_buffer" keyword to allow content inspections
* on the decoded template application layer buffers.
*/
#include "suricata-common.h"
#include "conf.h"
#include "detect.h"
#include "app-layer-template.h"
static int DetectTemplateBufferSetup(DetectEngineCtx *, Signature *, char *);
static void DetectTemplateBufferRegisterTests(void);
void DetectTemplateBufferRegister(void)
{
if (ConfGetNode("app-layer.protocols.template") == NULL) {
return;
}
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].name = "template_buffer";
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].desc =
"Template content modififier to match on the template buffers";
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].alproto = ALPROTO_TEMPLATE;
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].Setup = DetectTemplateBufferSetup;
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].RegisterTests =
DetectTemplateBufferRegisterTests;
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].flags |= SIGMATCH_NOOPT;
sigmatch_table[DETECT_AL_TEMPLATE_BUFFER].flags |= SIGMATCH_PAYLOAD;
SCLogNotice("Template application layer detect registered.");
}
static int DetectTemplateBufferSetup(DetectEngineCtx *de_ctx, Signature *s,
char *str)
{
s->list = DETECT_SM_LIST_TEMPLATE_BUFFER_MATCH;
s->alproto = ALPROTO_TEMPLATE;
return 0;
}
#ifdef UNITTESTS
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "app-layer-parser.h"
#include "detect-engine.h"
#include "detect-parse.h"
#include "flow-util.h"
#include "stream-tcp.h"
static int DetectTemplateBufferTest(void)
{
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
DetectEngineCtx *de_ctx = NULL;
Flow f;
Packet *p;
TcpSession tcp;
ThreadVars tv;
Signature *s;
int result = 0;
uint8_t request[] = "Hello World!";
/* Setup flow. */
memset(&f, 0, sizeof(Flow));
memset(&tcp, 0, sizeof(TcpSession));
memset(&tv, 0, sizeof(ThreadVars));
p = UTHBuildPacket(request, sizeof(request), IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_TEMPLATE;
f.protoctx = (void *)&tcp;
f.proto = IPPROTO_TCP;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(TRUE);
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL) {
goto end;
}
/* This rule should match. */
s = DetectEngineAppendSig(de_ctx,
"alert tcp any any -> any any ("
"msg:\"TEMPLATE Test Rule\"; "
"template_buffer; content:\"World!\"; "
"sid:1; rev:1;)");
if (s == NULL) {
goto end;
}
/* This rule should not match. */
s = DetectEngineAppendSig(de_ctx,
"alert tcp any any -> any any ("
"msg:\"TEMPLATE Test Rule\"; "
"template_buffer; content:\"W0rld!\"; "
"sid:2; rev:1;)");
if (s == NULL) {
goto end;
}
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
SCMutexLock(&f.m);
AppLayerParserParse(alp_tctx, &f, ALPROTO_TEMPLATE, STREAM_TOSERVER,
request, sizeof(request));
SCMutexUnlock(&f.m);
/* Check that we have app-layer state. */
if (f.alstate == NULL) {
goto end;
}
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
if (!PacketAlertCheck(p, 1)) {
goto end;
}
if (PacketAlertCheck(p, 2)) {
goto end;
}
result = 1;
end:
/* Cleanup. */
if (alp_tctx != NULL)
AppLayerParserThreadCtxFree(alp_tctx);
if (det_ctx != NULL)
DetectEngineThreadCtxDeinit(&tv, det_ctx);
if (de_ctx != NULL)
SigGroupCleanup(de_ctx);
if (de_ctx != NULL)
DetectEngineCtxFree(de_ctx);
StreamTcpFreeConfig(TRUE);
FLOW_DESTROY(&f);
UTHFreePacket(p);
return result;
}
#endif
static void DetectTemplateBufferRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("DetectTemplateBufferTest", DetectTemplateBufferTest, 1);
#endif /* UNITTESTS */
}
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