/* 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);

}