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/* Copyright (C) 2020-2022 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.
*/
/**
*
* \author Frank Honza <frank.honza@dcso.de>
*/
#include "suricata-common.h"
#include "conf.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-prefilter.h"
#include "detect-engine-content-inspection.h"
#include "detect-engine-mpm.h"
#include "detect-ike-vendor.h"
#include "app-layer-parser.h"
#include "util-byte.h"
#include "rust-bindings.h"
#include "util-profiling.h"
static int DetectIkeVendorSetup(DetectEngineCtx *, Signature *, const char *);
typedef struct {
char *vendor;
} DetectIkeVendorData;
struct IkeVendorGetDataArgs {
uint32_t local_id;
void *txv;
};
typedef struct PrefilterMpmIkeVendor {
int list_id;
const MpmCtx *mpm_ctx;
const DetectEngineTransforms *transforms;
} PrefilterMpmIkeVendor;
static int g_ike_vendor_buffer_id = 0;
static InspectionBuffer *IkeVendorGetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *f, struct IkeVendorGetDataArgs *cbdata,
int list_id)
{
SCEnter();
InspectionBuffer *buffer =
InspectionBufferMultipleForListGet(det_ctx, list_id, cbdata->local_id);
if (buffer == NULL)
return NULL;
if (buffer->initialized)
return buffer;
const uint8_t *data;
uint32_t data_len;
if (rs_ike_tx_get_vendor(cbdata->txv, cbdata->local_id, &data, &data_len) == 0) {
InspectionBufferSetupMultiEmpty(buffer);
return NULL;
}
InspectionBufferSetupMulti(buffer, transforms, data, data_len);
SCReturnPtr(buffer, "InspectionBuffer");
}
/** \brief IkeVendor Mpm prefilter callback
*
* \param det_ctx detection engine thread ctx
* \param p packet to inspect
* \param f flow to inspect
* \param txv tx to inspect
* \param pectx inspection context
*/
static void PrefilterTxIkeVendor(DetectEngineThreadCtx *det_ctx, const void *pectx, Packet *p,
Flow *f, void *txv, const uint64_t idx, const AppLayerTxData *_txd, const uint8_t flags)
{
SCEnter();
const PrefilterMpmIkeVendor *ctx = (const PrefilterMpmIkeVendor *)pectx;
const MpmCtx *mpm_ctx = ctx->mpm_ctx;
const int list_id = ctx->list_id;
uint32_t local_id = 0;
while (1) {
struct IkeVendorGetDataArgs cbdata = { local_id, txv };
InspectionBuffer *buffer = IkeVendorGetData(det_ctx, ctx->transforms, f, &cbdata, list_id);
if (buffer == NULL)
break;
if (buffer->inspect_len >= mpm_ctx->minlen) {
(void)mpm_table[mpm_ctx->mpm_type].Search(
mpm_ctx, &det_ctx->mtcu, &det_ctx->pmq, buffer->inspect, buffer->inspect_len);
PREFILTER_PROFILING_ADD_BYTES(det_ctx, buffer->inspect_len);
}
local_id++;
}
SCReturn;
}
static void PrefilterMpmIkeVendorFree(void *ptr)
{
if (ptr != NULL)
SCFree(ptr);
}
static int PrefilterMpmIkeVendorRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
{
PrefilterMpmIkeVendor *pectx = SCCalloc(1, sizeof(*pectx));
if (pectx == NULL)
return -1;
pectx->list_id = list_id;
pectx->mpm_ctx = mpm_ctx;
pectx->transforms = &mpm_reg->transforms;
return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxIkeVendor, mpm_reg->app_v2.alproto,
mpm_reg->app_v2.tx_min_progress, pectx, PrefilterMpmIkeVendorFree, mpm_reg->pname);
}
static uint8_t DetectEngineInspectIkeVendor(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags,
void *alstate, void *txv, uint64_t tx_id)
{
uint32_t local_id = 0;
const DetectEngineTransforms *transforms = NULL;
if (!engine->mpm) {
transforms = engine->v2.transforms;
}
while (1) {
struct IkeVendorGetDataArgs cbdata = {
local_id,
txv,
};
InspectionBuffer *buffer =
IkeVendorGetData(det_ctx, transforms, f, &cbdata, engine->sm_list);
if (buffer == NULL || buffer->inspect == NULL)
break;
det_ctx->buffer_offset = 0;
det_ctx->discontinue_matching = 0;
det_ctx->inspection_recursion_counter = 0;
const int match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd, NULL, f,
(uint8_t *)buffer->inspect, buffer->inspect_len, buffer->inspect_offset,
DETECT_CI_FLAGS_SINGLE, DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE);
if (match == 1) {
return DETECT_ENGINE_INSPECT_SIG_MATCH;
}
local_id++;
}
return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
}
/**
* \brief Registration function for ike.vendor keyword.
*/
void DetectIkeVendorRegister(void)
{
sigmatch_table[DETECT_AL_IKE_VENDOR].name = "ike.vendor";
sigmatch_table[DETECT_AL_IKE_VENDOR].desc = "match IKE Vendor";
sigmatch_table[DETECT_AL_IKE_VENDOR].url = "/rules/ike-keywords.html#ike-vendor";
sigmatch_table[DETECT_AL_IKE_VENDOR].Setup = DetectIkeVendorSetup;
sigmatch_table[DETECT_AL_IKE_VENDOR].flags |= SIGMATCH_NOOPT;
sigmatch_table[DETECT_AL_IKE_VENDOR].flags |= SIGMATCH_INFO_STICKY_BUFFER;
DetectAppLayerMpmRegister2("ike.vendor", SIG_FLAG_TOSERVER, 1, PrefilterMpmIkeVendorRegister,
NULL, ALPROTO_IKE, 1);
DetectAppLayerInspectEngineRegister2(
"ike.vendor", ALPROTO_IKE, SIG_FLAG_TOSERVER, 1, DetectEngineInspectIkeVendor, NULL);
g_ike_vendor_buffer_id = DetectBufferTypeGetByName("ike.vendor");
DetectBufferTypeSupportsMultiInstance("ike.vendor");
}
/**
* \brief setup the sticky buffer keyword used in the rule
*
* \param de_ctx Pointer to the Detection Engine Context
* \param s Pointer to the Signature to which the current keyword belongs
* \param str Should hold an empty string always
*
* \retval 0 On success
* \retval -1 On failure
*/
static int DetectIkeVendorSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
if (DetectBufferSetActiveList(de_ctx, s, g_ike_vendor_buffer_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)
return -1;
return 0;
}
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