detect-engine-helper.c

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/* Copyright (C) 2023 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 Philippe Antoine <p.antoine@catenacyber.fr>
 *
 */
 
#include "suricata-common.h"
#include "detect-engine.h"
#include "detect-engine-helper.h"
#include "detect-engine-mpm.h"
#include "detect-engine-prefilter.h"
#include "detect-parse.h"
#include "detect-engine-content-inspection.h"
#include "rust.h"
#include "app-layer-parser.h"
#include "util-validate.h"
 
int SCDetectHelperBufferProgressRegister(
        const char *name, AppProto alproto, uint8_t direction, uint8_t progress)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto));
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerInspectEngineRegister(
                name, alproto, SIG_FLAG_TOSERVER, progress, DetectEngineInspectGenericList, NULL);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerInspectEngineRegister(
                name, alproto, SIG_FLAG_TOCLIENT, progress, DetectEngineInspectGenericList, NULL);
    }
    return DetectBufferTypeRegister(name);
}
 
int SCDetectHelperBufferProgressRegisterSubState(
        const char *name, AppProto alproto, uint8_t direction, uint8_t sub_state, uint8_t progress)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto) && sub_state == 0);
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerInspectEngineRegisterSubState(name, alproto, SIG_FLAG_TOSERVER, sub_state,
                (uint8_t)progress, DetectEngineInspectGenericList, NULL);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerInspectEngineRegisterSubState(name, alproto, SIG_FLAG_TOCLIENT, sub_state,
                (uint8_t)progress, DetectEngineInspectGenericList, NULL);
    }
    return DetectBufferTypeRegister(name);
}
 
int SCDetectHelperBufferMpmRegister(const char *name, const char *desc, AppProto alproto,
        uint8_t direction, InspectionSingleBufferGetDataPtr GetData)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto));
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerInspectEngineRegisterSingle(
                name, alproto, SIG_FLAG_TOSERVER, 0, DetectEngineInspectBufferSingle, GetData);
        DetectAppLayerMpmRegisterSingle(
                name, SIG_FLAG_TOSERVER, 2, PrefilterSingleMpmRegister, GetData, alproto, 0);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerInspectEngineRegisterSingle(
                name, alproto, SIG_FLAG_TOCLIENT, 0, DetectEngineInspectBufferSingle, GetData);
        DetectAppLayerMpmRegisterSingle(
                name, SIG_FLAG_TOCLIENT, 2, PrefilterSingleMpmRegister, GetData, alproto, 0);
    }
    DetectBufferTypeSetDescriptionByName(name, desc);
    return DetectBufferTypeGetByName(name);
}
 
int SCDetectRegisterMpmGeneric(const char *name, const char *desc, AppProto alproto,
        uint8_t direction, InspectionBufferGetDataPtr GetData, uint8_t progress)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto));
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerInspectEngineRegister(name, alproto, SIG_FLAG_TOSERVER, progress,
                DetectEngineInspectBufferGeneric, GetData);
        DetectAppLayerMpmRegister(name, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, GetData,
                alproto, progress);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerInspectEngineRegister(name, alproto, SIG_FLAG_TOCLIENT, progress,
                DetectEngineInspectBufferGeneric, GetData);
        DetectAppLayerMpmRegister(name, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister, GetData,
                alproto, progress);
    }
    DetectBufferTypeSetDescriptionByName(name, desc);
    return DetectBufferTypeGetByName(name);
}
 
int SCDetectHelperBufferProgressMpmRegister(const char *name, const char *desc, AppProto alproto,
        uint8_t direction, InspectionSingleBufferGetDataPtr GetData, uint8_t progress)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto));
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerInspectEngineRegisterSingle(name, alproto, SIG_FLAG_TOSERVER, progress,
                DetectEngineInspectBufferSingle, GetData);
        DetectAppLayerMpmRegisterSingle(
                name, SIG_FLAG_TOSERVER, 2, PrefilterSingleMpmRegister, GetData, alproto, progress);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerInspectEngineRegisterSingle(name, alproto, SIG_FLAG_TOCLIENT, progress,
                DetectEngineInspectBufferSingle, GetData);
        DetectAppLayerMpmRegisterSingle(
                name, SIG_FLAG_TOCLIENT, 2, PrefilterSingleMpmRegister, GetData, alproto, progress);
    }
    DetectBufferTypeSetDescriptionByName(name, desc);
    return DetectBufferTypeGetByName(name);
}
 
int SCDetectHelperMultiBufferProgressMpmRegister(const char *name, const char *desc,
        AppProto alproto, uint8_t direction, InspectionMultiBufferGetDataPtr GetData,
        uint8_t progress)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto));
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerMultiRegister(name, alproto, SIG_FLAG_TOSERVER, progress, GetData, 2);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerMultiRegister(name, alproto, SIG_FLAG_TOCLIENT, progress, GetData, 2);
    }
    DetectBufferTypeSupportsMultiInstance(name);
    DetectBufferTypeSetDescriptionByName(name, desc);
    return DetectBufferTypeGetByName(name);
}
 
int SCDetectHelperMultiBufferProgressMpmRegisterSubState(const char *name, const char *desc,
        AppProto alproto, uint8_t direction, InspectionMultiBufferGetDataPtr GetData,
        uint8_t sub_state, uint8_t progress)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto) && sub_state == 0);
    if (direction & STREAM_TOSERVER) {
        DetectAppLayerMultiRegisterSubState(
                name, alproto, SIG_FLAG_TOSERVER, sub_state, progress, GetData, 2);
    }
    if (direction & STREAM_TOCLIENT) {
        DetectAppLayerMultiRegisterSubState(
                name, alproto, SIG_FLAG_TOCLIENT, sub_state, progress, GetData, 2);
    }
    DetectBufferTypeSupportsMultiInstance(name);
    DetectBufferTypeSetDescriptionByName(name, desc);
    return DetectBufferTypeGetByName(name);
}
 
int SCDetectHelperMultiBufferMpmRegister(const char *name, const char *desc, AppProto alproto,
        uint8_t direction, InspectionMultiBufferGetDataPtr GetData)
{
    DEBUG_VALIDATE_BUG_ON(AppLayerParserSupportsSubStates(alproto));
    return SCDetectHelperMultiBufferProgressMpmRegister(name, desc, alproto, direction, GetData, 0);
}
 
int SCDetectHelperNewKeywordId(void)
{
    if (DETECT_TBLSIZE_IDX >= DETECT_TBLSIZE) {
        void *tmp = SCRealloc(
                sigmatch_table, (DETECT_TBLSIZE + DETECT_TBLSIZE_STEP) * sizeof(SigTableElmt));
        if (unlikely(tmp == NULL)) {
            return -1;
        }
        sigmatch_table = tmp;
        memset(&sigmatch_table[DETECT_TBLSIZE], 0, DETECT_TBLSIZE_STEP * sizeof(SigTableElmt));
        DETECT_TBLSIZE += DETECT_TBLSIZE_STEP;
    }
 
    DETECT_TBLSIZE_IDX++;
    return DETECT_TBLSIZE_IDX - 1;
}
 
uint16_t SCDetectHelperKeywordRegister(const SCSigTableAppLiteElmt *kw)
{
    int keyword_id = SCDetectHelperNewKeywordId();
    if (keyword_id < 0) {
        return -1;
    }
 
    sigmatch_table[keyword_id].name = kw->name;
    sigmatch_table[keyword_id].desc = kw->desc;
    sigmatch_table[keyword_id].url = kw->url;
    sigmatch_table[keyword_id].flags = kw->flags;
    sigmatch_table[keyword_id].AppLayerTxMatch =
            (int (*)(DetectEngineThreadCtx * det_ctx, Flow * f, uint8_t flags, void *alstate,
                    void *txv, const Signature *s, const SigMatchCtx *ctx)) kw->AppLayerTxMatch;
    sigmatch_table[keyword_id].Setup =
            (int (*)(DetectEngineCtx * de, Signature * s, const char *raw)) kw->Setup;
    sigmatch_table[keyword_id].Free = (void (*)(DetectEngineCtx * de, void *ptr)) kw->Free;
 
    return (uint16_t)keyword_id;
}
 
void SCDetectHelperKeywordAliasRegister(uint16_t kwid, const char *alias)
{
    sigmatch_table[kwid].alias = alias;
}
 
int SCDetectHelperTransformRegister(const SCTransformTableElmt *kw)
{
    int transform_id = SCDetectHelperNewKeywordId();
    if (transform_id < 0) {
        return -1;
    }
 
    sigmatch_table[transform_id].name = kw->name;
    sigmatch_table[transform_id].desc = kw->desc;
    sigmatch_table[transform_id].url = kw->url;
    sigmatch_table[transform_id].flags = kw->flags;
    sigmatch_table[transform_id].Transform = (void (*)(DetectEngineThreadCtx * det_ctx,
            InspectionBuffer * buffer, const void *options)) kw->Transform;
    sigmatch_table[transform_id].TransformValidate = kw->TransformValidate;
    sigmatch_table[transform_id].Setup =
            (int (*)(DetectEngineCtx * de, Signature * s, const char *raw)) kw->Setup;
    sigmatch_table[transform_id].Free = (void (*)(DetectEngineCtx * de, void *ptr)) kw->Free;
    sigmatch_table[transform_id].TransformId = kw->TransformId;
 
    return transform_id;
}
 
void SCDetectRegisterBufferLowerMd5Callbacks(const char *name)
{
    DetectBufferTypeRegisterSetupCallback(name, DetectLowerSetupCallback);
    DetectBufferTypeRegisterValidateCallback(name, DetectMd5ValidateCallback);
}