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detect/smb: add smb.ntlmssp_user keyword
Feature OISF#5411.
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/* 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. | ||
*/ | ||
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/** | ||
* \file | ||
* | ||
* \author Eric Leblond <el@stamus-networks.com> | ||
* | ||
*/ | ||
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#include "suricata-common.h" | ||
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#include "detect.h" | ||
#include "detect-parse.h" | ||
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#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" | ||
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#include "detect-smb-ntlmssp.h" | ||
#include "rust.h" | ||
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#define BUFFER_NAME "smb_ntlmssp_user" | ||
#define KEYWORD_NAME "smb.ntlmssp_user" | ||
#define KEYWORD_ID DETECT_SMB_NTLMSSP_USER | ||
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static int g_smb_nltmssp_user_buffer_id = 0; | ||
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static int DetectSmbNtlmsspUserSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg) | ||
{ | ||
if (DetectBufferSetActiveList(s, g_smb_nltmssp_user_buffer_id) < 0) | ||
return -1; | ||
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if (DetectSignatureSetAppProto(s, ALPROTO_SMB) < 0) | ||
return -1; | ||
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return 0; | ||
} | ||
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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; | ||
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if (rs_smb_tx_get_ntlmssp_user(txv, &b, &b_len) != 1) | ||
return NULL; | ||
if (b == NULL || b_len == 0) | ||
return NULL; | ||
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InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len); | ||
InspectionBufferApplyTransforms(buffer, transforms); | ||
} | ||
return buffer; | ||
} | ||
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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"; | ||
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DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, | ||
GetNtlmsspUserData, ALPROTO_SMB, 1); | ||
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DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_SMB, SIG_FLAG_TOSERVER, 0, | ||
DetectEngineInspectBufferGeneric, GetNtlmsspUserData); | ||
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g_smb_nltmssp_user_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME); | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,29 @@ | ||
/* 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. | ||
*/ | ||
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/** | ||
* \file | ||
* | ||
* \author Eric Leblond <el@stamus-networks.com> | ||
*/ | ||
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#ifndef __DETECT_SMB_NTLMSSP_H__ | ||
#define __DETECT_SMB_NTLMSSP_H__ | ||
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void DetectSmbNtlmsspUserRegister(void); | ||
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#endif /* __DETECT_SMB_NTLMSSP_H__ */ |