1 files changed, 118 insertions, 0 deletions
diff --git a/src/detect-ike-nonce-payload.c b/src/detect-ike-nonce-payload.c
new file mode 100644
index 0000000..a6b73cd
--- /dev/null
+++ b/src/detect-ike-nonce-payload.c
@@ -0,0 +1,118 @@
+/* Copyright (C) 2020 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.
+ */
+
+/**
+ *
+ * \author Frank Honza <frank.honza@dcso.de>
+ */
+
+#include "suricata-common.h"
+#include "threads.h"
+#include "decode.h"
+#include "detect.h"
+
+#include "detect-parse.h"
+#include "detect-engine.h"
+#include "detect-engine-mpm.h"
+#include "detect-engine-prefilter.h"
+#include "detect-urilen.h"
+
+#include "flow.h"
+#include "flow-var.h"
+#include "flow-util.h"
+
+#include "util-debug.h"
+#include "util-unittest.h"
+#include "util-unittest-helper.h"
+#include "util-spm.h"
+
+#include "app-layer.h"
+#include "app-layer-parser.h"
+
+#include "detect-ike-nonce-payload.h"
+#include "stream-tcp.h"
+
+#include "rust.h"
+#include "app-layer-ike.h"
+#include "rust-bindings.h"
+
+#define KEYWORD_NAME_NONCE "ike.nonce_payload"
+#define KEYWORD_DOC_NONCE  "ike-keywords.html#ike-nonce_payload";
+#define BUFFER_NAME_NONCE  "ike.nonce_payload"
+#define BUFFER_DESC_NONCE  "ike nonce payload"
+
+static int g_buffer_nonce_id = 0;
+
+static int DetectNonceSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
+{
+    if (DetectBufferSetActiveList(de_ctx, s, g_buffer_nonce_id) < 0)
+        return -1;
+
+    if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)
+        return -1;
+
+    return 0;
+}
+
+static InspectionBuffer *GetNonceData(DetectEngineThreadCtx *det_ctx,
+        const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
+        const int list_id)
+{
+    InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
+    if (buffer->inspect == NULL) {
+        const uint8_t *b = NULL;
+        uint32_t b_len = 0;
+
+        if (rs_ike_state_get_nonce(txv, &b, &b_len) != 1)
+            return NULL;
+        if (b == NULL || b_len == 0)
+            return NULL;
+
+        InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
+        InspectionBufferApplyTransforms(buffer, transforms);
+    }
+
+    return buffer;
+}
+
+void DetectIkeNonceRegister(void)
+{
+    // register nonce
+    sigmatch_table[DETECT_AL_IKE_NONCE].name = KEYWORD_NAME_NONCE;
+    sigmatch_table[DETECT_AL_IKE_NONCE].url =
+            "/rules/" KEYWORD_DOC_NONCE sigmatch_table[DETECT_AL_IKE_NONCE].desc =
+                    "sticky buffer to match on the IKE nonce_payload";
+    sigmatch_table[DETECT_AL_IKE_NONCE].Setup = DetectNonceSetup;
+    sigmatch_table[DETECT_AL_IKE_NONCE].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
+
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME_NONCE, ALPROTO_IKE, SIG_FLAG_TOSERVER, 1,
+            DetectEngineInspectBufferGeneric, GetNonceData);
+
+    DetectAppLayerMpmRegister2(BUFFER_NAME_NONCE, SIG_FLAG_TOSERVER, 1, PrefilterGenericMpmRegister,
+            GetNonceData, ALPROTO_IKE, 1);
+
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME_NONCE, ALPROTO_IKE, SIG_FLAG_TOCLIENT, 1,
+            DetectEngineInspectBufferGeneric, GetNonceData);
+
+    DetectAppLayerMpmRegister2(BUFFER_NAME_NONCE, SIG_FLAG_TOCLIENT, 1, PrefilterGenericMpmRegister,
+            GetNonceData, ALPROTO_IKE, 1);
+
+    DetectBufferTypeSetDescriptionByName(BUFFER_NAME_NONCE, BUFFER_DESC_NONCE);
+
+    g_buffer_nonce_id = DetectBufferTypeGetByName(BUFFER_NAME_NONCE);
+    SCLogDebug("registering " BUFFER_NAME_NONCE " rule option");
+}