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215 lines
6.8 KiB
C
215 lines
6.8 KiB
C
/* Copyright (C) 2020-2022 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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*
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* \author Frank Honza <frank.honza@dcso.de>
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*/
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#include "suricata-common.h"
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#include "conf.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-prefilter.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-engine-mpm.h"
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#include "detect-ike-vendor.h"
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#include "app-layer-parser.h"
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#include "util-byte.h"
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#include "rust-bindings.h"
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#include "util-profiling.h"
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static int DetectIkeVendorSetup(DetectEngineCtx *, Signature *, const char *);
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typedef struct {
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char *vendor;
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} DetectIkeVendorData;
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struct IkeVendorGetDataArgs {
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uint32_t local_id;
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void *txv;
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};
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typedef struct PrefilterMpmIkeVendor {
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int list_id;
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const MpmCtx *mpm_ctx;
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const DetectEngineTransforms *transforms;
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} PrefilterMpmIkeVendor;
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static int g_ike_vendor_buffer_id = 0;
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static InspectionBuffer *IkeVendorGetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, struct IkeVendorGetDataArgs *cbdata,
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int list_id)
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{
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SCEnter();
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InspectionBuffer *buffer =
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InspectionBufferMultipleForListGet(det_ctx, list_id, cbdata->local_id);
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if (buffer == NULL)
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return NULL;
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if (buffer->initialized)
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return buffer;
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const uint8_t *data;
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uint32_t data_len;
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if (rs_ike_tx_get_vendor(cbdata->txv, cbdata->local_id, &data, &data_len) == 0) {
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InspectionBufferSetupMultiEmpty(buffer);
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return NULL;
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}
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InspectionBufferSetupMulti(buffer, transforms, data, data_len);
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SCReturnPtr(buffer, "InspectionBuffer");
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}
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/** \brief IkeVendor Mpm prefilter callback
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*
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* \param det_ctx detection engine thread ctx
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* \param p packet to inspect
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* \param f flow to inspect
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* \param txv tx to inspect
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* \param pectx inspection context
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*/
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static void PrefilterTxIkeVendor(DetectEngineThreadCtx *det_ctx, const void *pectx, Packet *p,
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Flow *f, void *txv, const uint64_t idx, const AppLayerTxData *_txd, const uint8_t flags)
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{
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SCEnter();
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const PrefilterMpmIkeVendor *ctx = (const PrefilterMpmIkeVendor *)pectx;
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const MpmCtx *mpm_ctx = ctx->mpm_ctx;
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const int list_id = ctx->list_id;
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uint32_t local_id = 0;
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while (1) {
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struct IkeVendorGetDataArgs cbdata = { local_id, txv };
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InspectionBuffer *buffer = IkeVendorGetData(det_ctx, ctx->transforms, f, &cbdata, list_id);
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if (buffer == NULL)
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break;
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if (buffer->inspect_len >= mpm_ctx->minlen) {
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(void)mpm_table[mpm_ctx->mpm_type].Search(
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mpm_ctx, &det_ctx->mtcu, &det_ctx->pmq, buffer->inspect, buffer->inspect_len);
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PREFILTER_PROFILING_ADD_BYTES(det_ctx, buffer->inspect_len);
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}
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local_id++;
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}
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SCReturn;
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}
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static void PrefilterMpmIkeVendorFree(void *ptr)
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{
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if (ptr != NULL)
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SCFree(ptr);
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}
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static int PrefilterMpmIkeVendorRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
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MpmCtx *mpm_ctx, const DetectBufferMpmRegistery *mpm_reg, int list_id)
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{
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PrefilterMpmIkeVendor *pectx = SCCalloc(1, sizeof(*pectx));
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if (pectx == NULL)
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return -1;
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pectx->list_id = list_id;
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pectx->mpm_ctx = mpm_ctx;
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pectx->transforms = &mpm_reg->transforms;
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return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxIkeVendor, mpm_reg->app_v2.alproto,
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mpm_reg->app_v2.tx_min_progress, pectx, PrefilterMpmIkeVendorFree, mpm_reg->pname);
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}
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static uint8_t DetectEngineInspectIkeVendor(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
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const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags,
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void *alstate, void *txv, uint64_t tx_id)
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{
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uint32_t local_id = 0;
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const DetectEngineTransforms *transforms = NULL;
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if (!engine->mpm) {
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transforms = engine->v2.transforms;
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}
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while (1) {
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struct IkeVendorGetDataArgs cbdata = {
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local_id,
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txv,
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};
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InspectionBuffer *buffer =
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IkeVendorGetData(det_ctx, transforms, f, &cbdata, engine->sm_list);
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if (buffer == NULL || buffer->inspect == NULL)
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break;
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det_ctx->buffer_offset = 0;
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det_ctx->discontinue_matching = 0;
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det_ctx->inspection_recursion_counter = 0;
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const int match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd, NULL, f,
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(uint8_t *)buffer->inspect, buffer->inspect_len, buffer->inspect_offset,
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DETECT_CI_FLAGS_SINGLE, DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE);
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if (match == 1) {
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return DETECT_ENGINE_INSPECT_SIG_MATCH;
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}
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local_id++;
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}
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return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
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}
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/**
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* \brief Registration function for ike.vendor keyword.
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*/
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void DetectIkeVendorRegister(void)
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{
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sigmatch_table[DETECT_AL_IKE_VENDOR].name = "ike.vendor";
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sigmatch_table[DETECT_AL_IKE_VENDOR].desc = "match IKE Vendor";
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sigmatch_table[DETECT_AL_IKE_VENDOR].url = "/rules/ike-keywords.html#ike-vendor";
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sigmatch_table[DETECT_AL_IKE_VENDOR].Setup = DetectIkeVendorSetup;
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sigmatch_table[DETECT_AL_IKE_VENDOR].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_AL_IKE_VENDOR].flags |= SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerMpmRegister2("ike.vendor", SIG_FLAG_TOSERVER, 1, PrefilterMpmIkeVendorRegister,
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NULL, ALPROTO_IKE, 1);
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DetectAppLayerInspectEngineRegister2(
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"ike.vendor", ALPROTO_IKE, SIG_FLAG_TOSERVER, 1, DetectEngineInspectIkeVendor, NULL);
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g_ike_vendor_buffer_id = DetectBufferTypeGetByName("ike.vendor");
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DetectBufferTypeSupportsMultiInstance("ike.vendor");
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}
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/**
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* \brief setup the sticky buffer keyword used in the rule
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*
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* \param de_ctx Pointer to the Detection Engine Context
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* \param s Pointer to the Signature to which the current keyword belongs
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* \param str Should hold an empty string always
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*
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* \retval 0 On success
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* \retval -1 On failure
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*/
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static int DetectIkeVendorSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(de_ctx, s, g_ike_vendor_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)
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return -1;
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return 0;
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}
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