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-rw-r--r--src/detect-l3proto.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/src/detect-l3proto.c b/src/detect-l3proto.c
new file mode 100644
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--- /dev/null
+++ b/src/detect-l3proto.c
@@ -0,0 +1,304 @@
+/* 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 */
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-23 23:04:47 +0000