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-rw-r--r--framework/src/suricata/src/detect-l3proto.c391
1 files changed, 391 insertions, 0 deletions
diff --git a/framework/src/suricata/src/detect-l3proto.c b/framework/src/suricata/src/detect-l3proto.c
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+++ b/framework/src/suricata/src/detect-l3proto.c
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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 "debug.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-siggroup.h"
+#include "detect-engine-address.h"
+
+#include "util-byte.h"
+#include "util-unittest.h"
+#include "util-unittest-helper.h"
+
+#include "util-debug.h"
+
+static int DetectL3ProtoSetup(DetectEngineCtx *, Signature *, char *);
+
+void DetectL3protoRegisterTests(void);
+
+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;
+ sigmatch_table[DETECT_L3PROTO].RegisterTests = DetectL3protoRegisterTests;
+
+ return;
+}
+/**
+ * \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, char *optstr)
+{
+ char *str = optstr;
+ char dubbed = 0;
+
+ /* strip "'s */
+ if (optstr[0] == '\"' && optstr[strlen(optstr) - 1] == '\"') {
+ str = SCStrdup(optstr + 1);
+ if (unlikely(str == NULL))
+ goto error;
+ str[strlen(optstr) - 2] = '\0';
+ dubbed = 1;
+ }
+
+ /* 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(SC_ERR_INVALID_SIGNATURE, "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(SC_ERR_INVALID_SIGNATURE, "Conflicting l3 proto specified");
+ goto error;
+ }
+ s->proto.flags |= DETECT_PROTO_IPV6;
+ SCLogDebug("IPv6 protocol detected");
+ } else {
+ SCLogError(SC_ERR_INVALID_SIGNATURE, "Invalid l3 proto: \"%s\"", str);
+ goto error;
+ }
+
+ if (dubbed)
+ SCFree(str);
+ return 0;
+error:
+ if (dubbed)
+ SCFree(str);
+ return -1;
+}
+
+#ifdef UNITTESTS
+
+#include "detect-parse.h"
+#include "detect-engine.h"
+#include "detect-engine-mpm.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();
+ if (unlikely(p == NULL))
+ return 0;
+ Signature *s = NULL;
+ ThreadVars th_v;
+ DetectEngineThreadCtx *det_ctx;
+ int result = 0;
+ 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();
+ if (de_ctx == NULL) {
+ goto end;
+ }
+
+ de_ctx->flags |= DE_QUIET;
+
+ s = de_ctx->sig_list = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv4\"; l3_proto:ipv4; sid:1;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv6\"; l3_proto:ipv6; sid:2;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ip4\"; l3_proto:ip4; sid:3;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ip6\"; l3_proto:ip6; sid:2;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ SigGroupBuild(de_ctx);
+ DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
+
+ SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
+ if (PacketAlertCheck(p, 1) == 0) {
+ printf("sid 1 did not alert, but should have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 2)) {
+ printf("sid 2 alerted, but should not have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 3) == 0) {
+ printf("sid 3 did not alert, but should have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 4)) {
+ printf("sid 4 alerted, but should not have: ");
+ goto cleanup;
+ }
+
+ result = 1;
+
+cleanup:
+ SigGroupCleanup(de_ctx);
+ SigCleanSignatures(de_ctx);
+
+ DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
+ DetectEngineCtxFree(de_ctx);
+
+end:
+ SCFree(p);
+ return result;
+}
+
+/**
+ * \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();
+ if (unlikely(p == NULL))
+ return 0;
+ Signature *s = NULL;
+ ThreadVars th_v;
+ DetectEngineThreadCtx *det_ctx;
+ int result = 0;
+ 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();
+ if (de_ctx == NULL) {
+ goto end;
+ }
+
+ de_ctx->flags |= DE_QUIET;
+
+ s = de_ctx->sig_list = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv4\"; l3_proto:ipv4; sid:1;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv6\"; l3_proto:ipv6; sid:2;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ip4\"; l3_proto:ip4; sid:3;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ip6\"; l3_proto:ip6; sid:4;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ SigGroupBuild(de_ctx);
+ DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
+
+ SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
+ if (PacketAlertCheck(p, 1)) {
+ printf("sid 1 alerted, but should not have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 2) == 0) {
+ printf("sid 2 did not alert, but should have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 3)) {
+ printf("sid 3 alerted, but should not have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 4) == 0) {
+ printf("sid 4 did not alert, but should have: ");
+ goto cleanup;
+ }
+
+ result = 1;
+
+cleanup:
+ SigGroupCleanup(de_ctx);
+ SigCleanSignatures(de_ctx);
+
+ DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
+ DetectEngineCtxFree(de_ctx);
+
+end:
+ SCFree(p);
+ return result;
+}
+
+/**
+ * \test DetectL3protoTestSig03 is a test for checking the working of l3proto keyword
+ * in conjonction with ip_proto keyword.
+ */
+
+static int DetectL3protoTestSig3(void)
+{
+
+ Packet *p = PacketGetFromAlloc();
+ if (unlikely(p == NULL))
+ return 0;
+ Signature *s = NULL;
+ ThreadVars th_v;
+ DetectEngineThreadCtx *det_ctx;
+ int result = 0;
+ 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();
+ if (de_ctx == NULL) {
+ goto end;
+ }
+
+ de_ctx->flags |= DE_QUIET;
+
+ s = de_ctx->sig_list = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv4 and ip_proto udp\"; l3_proto:ipv4; ip_proto:17; sid:1;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv6 and ip_proto udp\"; l3_proto:ipv6; ip_proto:17; sid:2;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ip4 and ip_proto tcp\"; l3_proto:ipv4; ip_proto:6; sid:3;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ s = s->next = SigInit(de_ctx,"alert ip any any -> any any (msg:\"l3proto ipv6 and ip_proto tcp\"; l3_proto:ipv6; ip_proto:6; sid:4;)");
+ if (s == NULL) {
+ goto end;
+ }
+
+ SigGroupBuild(de_ctx);
+ DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
+
+ SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
+ if (PacketAlertCheck(p, 1)) {
+ printf("sid 1 alerted, but should not have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 2)) {
+ printf("sid 2 alerted, but should not have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 3)) {
+ printf("sid 3 alerted, but should not have: ");
+ goto cleanup;
+ } else if (PacketAlertCheck(p, 4) == 0) {
+ printf("sid 4 did not alert, but should have: ");
+ goto cleanup;
+ }
+
+ result = 1;
+
+cleanup:
+ SigGroupCleanup(de_ctx);
+ SigCleanSignatures(de_ctx);
+
+ DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
+ DetectEngineCtxFree(de_ctx);
+
+end:
+ SCFree(p);
+ return result;
+}
+
+
+#endif /* UNITTESTS */
+
+/**
+ * \brief this function registers unit tests for DetectL3proto
+ */
+void DetectL3protoRegisterTests(void)
+{
+#ifdef UNITTESTS
+ UtRegisterTest("DetectL3protoTestSig1", DetectL3protoTestSig1, 1);
+ UtRegisterTest("DetectL3protoTestSig2", DetectL3protoTestSig2, 1);
+ UtRegisterTest("DetectL3protoTestSig3", DetectL3protoTestSig3, 1);
+#endif /* UNITTESTS */
+}