Adding upstream version 1:7.0.3.upstream/1%7.0.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 142 insertions, 0 deletions

diff --git a/src/detect-ike-nonce-payload-length.c b/src/detect-ike-nonce-payload-length.c
new file mode 100644
index 0000000..91bc6c2
--- /dev/null
+++ b/src/detect-ike-nonce-payload-length.c
@@ -0,0 +1,142 @@
+/* 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 "conf.h"
+#include "detect.h"
+#include "detect-parse.h"
+#include "detect-engine.h"
+#include "detect-engine-content-inspection.h"
+#include "detect-ike-nonce-payload-length.h"
+#include "app-layer-parser.h"
+#include "util-byte.h"
+#include "detect-engine-uint.h"
+
+#include "rust-bindings.h"
+
+/**
+ *   [ike.nonce_payload_length]:[=|<|>|<=|>=]<length>;
+ */
+static int DetectIkeNoncePayloadLengthSetup(DetectEngineCtx *, Signature *s, const char *str);
+static void DetectIkeNoncePayloadLengthFree(DetectEngineCtx *, void *);
+static int g_ike_nonce_payload_length_buffer_id = 0;
+
+static int DetectIkeNoncePayloadLengthMatch(DetectEngineThreadCtx *, Flow *, uint8_t, void *,
+        void *, const Signature *, const SigMatchCtx *);
+
+/**
+ * \brief Registration function for ike.nonce_payload_length keyword.
+ */
+void DetectIkeNoncePayloadLengthRegister(void)
+{
+    sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].name = "ike.nonce_payload_length";
+    sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].desc = "match IKE nonce payload length";
+    sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].url =
+            "/rules/ike-keywords.html#ike-nonce-payload-length";
+    sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].AppLayerTxMatch =
+            DetectIkeNoncePayloadLengthMatch;
+    sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].Setup = DetectIkeNoncePayloadLengthSetup;
+    sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].Free = DetectIkeNoncePayloadLengthFree;
+
+    DetectAppLayerInspectEngineRegister2("ike.nonce_payload_length", ALPROTO_IKE, SIG_FLAG_TOSERVER,
+            1, DetectEngineInspectGenericList, NULL);
+
+    DetectAppLayerInspectEngineRegister2("ike.nonce_payload_length", ALPROTO_IKE, SIG_FLAG_TOCLIENT,
+            1, DetectEngineInspectGenericList, NULL);
+
+    g_ike_nonce_payload_length_buffer_id = DetectBufferTypeGetByName("ike.nonce_payload_length");
+}
+
+/**
+ * \internal
+ * \brief Function to match nonce length of a IKE state
+ *
+ * \param det_ctx Pointer to the pattern matcher thread.
+ * \param f       Pointer to the current flow.
+ * \param flags   Flags.
+ * \param state   App layer state.
+ * \param txv     Pointer to the Ike Transaction.
+ * \param s       Pointer to the Signature.
+ * \param ctx     Pointer to the sigmatch that we will cast into DetectU32Data.
+ *
+ * \retval 0 no match.
+ * \retval 1 match.
+ */
+static int DetectIkeNoncePayloadLengthMatch(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags,
+        void *state, void *txv, const Signature *s, const SigMatchCtx *ctx)
+{
+    SCEnter();
+
+    uint32_t length;
+    if (!rs_ike_state_get_nonce_payload_length(txv, &length))
+        SCReturnInt(0);
+    const DetectU32Data *du32 = (const DetectU32Data *)ctx;
+    return DetectU32Match(length, du32);
+}
+
+/**
+ * \brief Function to add the parsed IKE nonce length field into the current signature.
+ *
+ * \param de_ctx Pointer to the Detection Engine Context.
+ * \param s      Pointer to the Current Signature.
+ * \param rawstr Pointer to the user provided flags options.
+ *
+ * \retval 0 on Success.
+ * \retval -1 on Failure.
+ */
+static int DetectIkeNoncePayloadLengthSetup(
+        DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
+{
+    if (DetectSignatureSetAppProto(s, ALPROTO_IKE) != 0)
+        return -1;
+
+    DetectU32Data *nonce_payload_length = DetectU32Parse(rawstr);
+    if (nonce_payload_length == NULL)
+        return -1;
+
+    /* okay so far so good, lets get this into a SigMatch
+     * and put it in the Signature. */
+    SigMatch *sm = SigMatchAlloc();
+    if (sm == NULL)
+        goto error;
+
+    sm->type = DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH;
+    sm->ctx = (SigMatchCtx *)nonce_payload_length;
+
+    SigMatchAppendSMToList(s, sm, g_ike_nonce_payload_length_buffer_id);
+    return 0;
+
+error:
+    DetectIkeNoncePayloadLengthFree(de_ctx, nonce_payload_length);
+    return -1;
+}
+
+/**
+ * \internal
+ * \brief Function to free memory associated with DetectU32Data.
+ *
+ * \param de_ptr Pointer to DetectU32Data.
+ */
+static void DetectIkeNoncePayloadLengthFree(DetectEngineCtx *de_ctx, void *ptr)
+{
+    rs_detect_u32_free(ptr);
+}