1 files changed, 149 insertions, 0 deletions
diff --git a/src/detect-smb-ntlmssp.c b/src/detect-smb-ntlmssp.c
new file mode 100644
index 0000000..a88b89c
--- /dev/null
+++ b/src/detect-smb-ntlmssp.c
@@ -0,0 +1,149 @@
+/* Copyright (C) 2022 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 <el@stamus-networks.com>
+ *
+ */
+
+#include "detect-engine-register.h"
+#include "suricata-common.h"
+
+#include "detect.h"
+#include "detect-parse.h"
+
+#include "detect-engine.h"
+#include "detect-engine-mpm.h"
+#include "detect-engine-state.h"
+#include "detect-engine-prefilter.h"
+#include "detect-engine-content-inspection.h"
+
+#include "detect-smb-ntlmssp.h"
+#include "rust.h"
+
+#define BUFFER_NAME  "smb_ntlmssp_user"
+#define KEYWORD_NAME "smb.ntlmssp_user"
+#define KEYWORD_ID   DETECT_SMB_NTLMSSP_USER
+
+static int g_smb_nltmssp_user_buffer_id = 0;
+
+static int DetectSmbNtlmsspUserSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
+{
+    if (DetectBufferSetActiveList(de_ctx, s, g_smb_nltmssp_user_buffer_id) < 0)
+        return -1;
+
+    if (DetectSignatureSetAppProto(s, ALPROTO_SMB) < 0)
+        return -1;
+
+    return 0;
+}
+
+static InspectionBuffer *GetNtlmsspUserData(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) {
+        uint32_t b_len = 0;
+        const uint8_t *b = NULL;
+
+        if (rs_smb_tx_get_ntlmssp_user(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 DetectSmbNtlmsspUserRegister(void)
+{
+    sigmatch_table[KEYWORD_ID].name = KEYWORD_NAME;
+    sigmatch_table[KEYWORD_ID].Setup = DetectSmbNtlmsspUserSetup;
+    sigmatch_table[KEYWORD_ID].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
+    sigmatch_table[KEYWORD_ID].desc = "sticky buffer to match on SMB ntlmssp user in session setup";
+
+    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
+            GetNtlmsspUserData, ALPROTO_SMB, 1);
+
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_SMB, SIG_FLAG_TOSERVER, 0,
+            DetectEngineInspectBufferGeneric, GetNtlmsspUserData);
+
+    g_smb_nltmssp_user_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
+}
+
+#undef BUFFER_NAME
+#undef KEYWORD_NAME
+#undef KEYWORD_ID
+
+#define BUFFER_NAME  "smb_ntlmssp_domain"
+#define KEYWORD_NAME "smb.ntlmssp_domain"
+#define KEYWORD_ID   DETECT_SMB_NTLMSSP_DOMAIN
+
+static int g_smb_nltmssp_domain_buffer_id = 0;
+
+static int DetectSmbNtlmsspDomainSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
+{
+    if (DetectBufferSetActiveList(de_ctx, s, g_smb_nltmssp_domain_buffer_id) < 0)
+        return -1;
+
+    if (DetectSignatureSetAppProto(s, ALPROTO_SMB) < 0)
+        return -1;
+
+    return 0;
+}
+
+static InspectionBuffer *GetNtlmsspDomainData(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) {
+        uint32_t b_len = 0;
+        const uint8_t *b = NULL;
+
+        if (rs_smb_tx_get_ntlmssp_domain(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 DetectSmbNtlmsspDomainRegister(void)
+{
+    sigmatch_table[KEYWORD_ID].name = KEYWORD_NAME;
+    sigmatch_table[KEYWORD_ID].Setup = DetectSmbNtlmsspDomainSetup;
+    sigmatch_table[KEYWORD_ID].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
+    sigmatch_table[KEYWORD_ID].desc =
+            "sticky buffer to match on SMB ntlmssp domain in session setup";
+
+    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
+            GetNtlmsspDomainData, ALPROTO_SMB, 1);
+
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_SMB, SIG_FLAG_TOSERVER, 0,
+            DetectEngineInspectBufferGeneric, GetNtlmsspDomainData);
+
+    g_smb_nltmssp_domain_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
+}