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/* Copyright (C) 2012-2013 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
*
* \author Eric Leblond <eric@regit.org>
*
*
* Implements the l3_proto keyword
*/
#include "suricata-common.h"
#include "decode.h"
#include "detect.h"
#include "detect-ipproto.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-mpm.h"
#include "detect-engine-build.h"
#include "detect-engine-siggroup.h"
#include "detect-engine-address.h"
#include "detect-l3proto.h"
#include "util-byte.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-debug.h"
static int DetectL3ProtoSetup(DetectEngineCtx *, Signature *, const char *);
#ifdef UNITTESTS
static void DetectL3protoRegisterTests(void);
#endif
void DetectL3ProtoRegister(void)
{
sigmatch_table[DETECT_L3PROTO].name = "l3_proto";
sigmatch_table[DETECT_L3PROTO].Match = NULL;
sigmatch_table[DETECT_L3PROTO].Setup = DetectL3ProtoSetup;
sigmatch_table[DETECT_L3PROTO].Free = NULL;
#ifdef UNITTESTS
sigmatch_table[DETECT_L3PROTO].RegisterTests = DetectL3protoRegisterTests;
#endif
}
/**
* \internal
* \brief Setup l3_proto keyword.
*
* \param de_ctx Detection engine context
* \param s Signature
* \param optstr Options string
*
* \return Non-zero on error
*/
static int DetectL3ProtoSetup(DetectEngineCtx *de_ctx, Signature *s, const char *optstr)
{
const char *str = optstr;
/* reset possible any value */
if (s->proto.flags & DETECT_PROTO_ANY) {
s->proto.flags &= ~DETECT_PROTO_ANY;
}
/* authorized value, ip, any, ip4, ipv4, ip6, ipv6 */
if (strcasecmp(str,"ipv4") == 0 ||
strcasecmp(str,"ip4") == 0 ) {
if (s->proto.flags & DETECT_PROTO_IPV6) {
SCLogError("Conflicting l3 proto specified");
goto error;
}
s->proto.flags |= DETECT_PROTO_IPV4;
SCLogDebug("IPv4 protocol detected");
} else if (strcasecmp(str,"ipv6") == 0 ||
strcasecmp(str,"ip6") == 0 ) {
if (s->proto.flags & DETECT_PROTO_IPV6) {
SCLogError("Conflicting l3 proto specified");
goto error;
}
s->proto.flags |= DETECT_PROTO_IPV6;
SCLogDebug("IPv6 protocol detected");
} else {
SCLogError("Invalid l3 proto: \"%s\"", str);
goto error;
}
return 0;
error:
return -1;
}
#ifdef UNITTESTS
#include "detect-engine-alert.h"
/**
* \test DetectL3protoTestSig01 is a test for checking the working of ttl keyword
* by setting up the signature and later testing its working by matching
* the received packet against the sig.
*/
static int DetectL3protoTestSig1(void)
{
Packet *p = PacketGetFromAlloc();
FAIL_IF_NULL(p);
Signature *s = NULL;
ThreadVars th_v;
DetectEngineThreadCtx *det_ctx;
IPV4Hdr ip4h;
memset(&th_v, 0, sizeof(th_v));
p->src.family = AF_INET;
p->dst.family = AF_INET;
p->proto = IPPROTO_TCP;
p->ip4h = &ip4h;
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv4\"; l3_proto:ipv4; sid:1;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv6\"; l3_proto:ipv6; sid:2;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ip4\"; l3_proto:ip4; sid:3;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ip6\"; l3_proto:ip6; sid:4;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
FAIL_IF(PacketAlertCheck(p, 2));
FAIL_IF_NOT(PacketAlertCheck(p, 3));
FAIL_IF(PacketAlertCheck(p, 4));
DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
SCFree(p);
PASS;
}
/**
* \test DetectL3protoTestSig02 is a test for checking the working of l3proto keyword
* by setting up the signature and later testing its working by matching
* the received IPv6 packet against the sig.
*/
static int DetectL3protoTestSig2(void)
{
Packet *p = PacketGetFromAlloc();
FAIL_IF_NULL(p);
Signature *s = NULL;
ThreadVars th_v;
DetectEngineThreadCtx *det_ctx;
IPV6Hdr ip6h;
memset(&th_v, 0, sizeof(th_v));
p->src.family = AF_INET6;
p->dst.family = AF_INET6;
p->proto = IPPROTO_TCP;
p->ip6h = &ip6h;
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv4\"; l3_proto:ipv4; sid:1;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv6\"; l3_proto:ipv6; sid:2;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ip4\"; l3_proto:ip4; sid:3;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (msg:\"l3proto ip6\"; l3_proto:ip6; sid:4;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
FAIL_IF(PacketAlertCheck(p, 1));
FAIL_IF_NOT(PacketAlertCheck(p, 2));
FAIL_IF(PacketAlertCheck(p, 3));
FAIL_IF_NOT(PacketAlertCheck(p, 4));
DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
SCFree(p);
PASS;
}
/**
* \test DetectL3protoTestSig03 is a test for checking the working of l3proto keyword
* in conjunction with ip_proto keyword.
*/
static int DetectL3protoTestSig3(void)
{
Packet *p = PacketGetFromAlloc();
FAIL_IF_NULL(p);
Signature *s = NULL;
ThreadVars th_v;
DetectEngineThreadCtx *det_ctx;
IPV6Hdr ip6h;
memset(&th_v, 0, sizeof(th_v));
p->src.family = AF_INET6;
p->dst.family = AF_INET6;
p->proto = IPPROTO_TCP;
p->ip6h = &ip6h;
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv4 and "
"ip_proto udp\"; l3_proto:ipv4; ip_proto:17; sid:1;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv6 and "
"ip_proto udp\"; l3_proto:ipv6; ip_proto:17; sid:2;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(de_ctx, "alert ip any any -> any any (msg:\"l3proto ip4 and ip_proto "
"tcp\"; l3_proto:ipv4; ip_proto:6; sid:3;)");
FAIL_IF_NULL(s);
s = DetectEngineAppendSig(de_ctx, "alert ip any any -> any any (msg:\"l3proto ipv6 and "
"ip_proto tcp\"; l3_proto:ipv6; ip_proto:6; sid:4;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
FAIL_IF(PacketAlertCheck(p, 1));
FAIL_IF(PacketAlertCheck(p, 2));
FAIL_IF(PacketAlertCheck(p, 3));
FAIL_IF_NOT(PacketAlertCheck(p, 4));
DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
SCFree(p);
PASS;
}
/**
* \brief this function registers unit tests for DetectL3proto
*/
static void DetectL3protoRegisterTests(void)
{
UtRegisterTest("DetectL3protoTestSig1", DetectL3protoTestSig1);
UtRegisterTest("DetectL3protoTestSig2", DetectL3protoTestSig2);
UtRegisterTest("DetectL3protoTestSig3", DetectL3protoTestSig3);
}
#endif /* UNITTESTS */
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