static InspectionBuffer *GetData(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) {
htp_tx_t *tx = (htp_tx_t *)txv;
HtpTxUserData *tx_ud = htp_tx_get_user_data(tx);
if (tx_ud == NULL)
return NULL;
const bool ts = ((flow_flags & STREAM_TOSERVER) != 0);
const uint8_t *data = ts ?
tx_ud->request_headers_raw : tx_ud->response_headers_raw;
if (data == NULL)
return NULL;
const uint8_t data_len = ts ?
tx_ud->request_headers_raw_len : tx_ud->response_headers_raw_len;
InspectionBufferSetup(buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f,
const uint8_t _flow_flags, void *txv, const int list_id)
{
SCEnter();
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
htp_tx_t *tx = (htp_tx_t *)txv;
HtpTxUserData *tx_ud = htp_tx_get_user_data(tx);
if (tx_ud == NULL || tx_ud->request_uri_normalized == NULL) {
SCLogDebug("no tx_id or uri");
return NULL;
}
const uint32_t data_len = bstr_len(tx_ud->request_uri_normalized);
const uint8_t *data = bstr_ptr(tx_ud->request_uri_normalized);
InspectionBufferSetup(buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static int InspectEngineHttpStart(
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)
{
const int list_id = engine->sm_list;
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
SCLogDebug("setting up inspect buffer %d", list_id);
/* if prefilter didn't already run, we need to consider transformations */
const DetectEngineTransforms *transforms = NULL;
if (!engine->mpm) {
transforms = engine->v2.transforms;
}
uint32_t rawdata_len = 0;
uint8_t *rawdata = GetBufferForTX(txv, tx_id, det_ctx,
f, flags, &rawdata_len);
if (rawdata_len == 0) {
SCLogDebug("no data");
goto end;
}
/* setup buffer and apply transforms */
InspectionBufferSetup(buffer, rawdata, rawdata_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
const uint32_t data_len = buffer->inspect_len;
const uint8_t *data = buffer->inspect;
const uint64_t offset = buffer->inspect_offset;
det_ctx->buffer_offset = 0;
det_ctx->discontinue_matching = 0;
det_ctx->inspection_recursion_counter = 0;
int r = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd,
NULL, f, (uint8_t *)data, data_len, offset,
DETECT_CI_FLAGS_SINGLE,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE);
if (r == 1)
return DETECT_ENGINE_INSPECT_SIG_MATCH;
end:
if (flags & STREAM_TOSERVER) {
if (AppLayerParserGetStateProgress(IPPROTO_TCP, ALPROTO_HTTP, txv, flags) > HTP_REQUEST_HEADERS)
return DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
} else {
if (AppLayerParserGetStateProgress(IPPROTO_TCP, ALPROTO_HTTP, txv, flags) > HTP_RESPONSE_HEADERS)
return DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
}
return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
}
static InspectionBuffer *GetData(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) {
htp_tx_t *tx = (htp_tx_t *)txv;
if (unlikely(tx->request_line == NULL)) {
return NULL;
}
const uint32_t data_len = bstr_len(tx->request_line);
const uint8_t *data = bstr_ptr(tx->request_line);
InspectionBufferSetup(buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static InspectionBuffer *GetNamedPipeData(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;
uint8_t *b = NULL;
if (rs_smb_tx_get_named_pipe(txv, &b, &b_len) != 1)
return NULL;
if (b == NULL || b_len == 0)
return NULL;
InspectionBufferSetup(buffer, b, b_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static InspectionBuffer *GetData(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) {
SSLState *ssl_state = (SSLState *)_f->alstate;
if (ssl_state->server_connp.cert0_issuerdn == NULL) {
return NULL;
}
const uint32_t data_len = strlen(ssl_state->server_connp.cert0_issuerdn);
const uint8_t *data = (uint8_t *)ssl_state->server_connp.cert0_issuerdn;
InspectionBufferSetup(buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
/** \brief HTTP Headers 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 PrefilterTxHttpResponseStart(DetectEngineThreadCtx *det_ctx,
const void *pectx,
Packet *p, Flow *f, void *txv,
const uint64_t idx, const uint8_t flags)
{
SCEnter();
const PrefilterMpmHttpStartCtx *ctx = pectx;
const MpmCtx *mpm_ctx = ctx->mpm_ctx;
SCLogDebug("running on list %d", ctx->list_id);
const int list_id = ctx->list_id;
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
uint32_t rawdata_len = 0;
uint8_t *rawdata = GetBufferForTX(txv, idx, det_ctx,
f, flags, &rawdata_len);
if (rawdata_len == 0)
return;
/* setup buffer and apply transforms */
InspectionBufferSetup(buffer, rawdata, rawdata_len);
InspectionBufferApplyTransforms(buffer, ctx->transforms);
}
const uint32_t data_len = buffer->inspect_len;
const uint8_t *data = buffer->inspect;
SCLogDebug("mpm'ing buffer:");
//PrintRawDataFp(stdout, data, data_len);
if (data != NULL && data_len >= mpm_ctx->minlen) {
(void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx,
&det_ctx->mtcu, &det_ctx->pmq, data, data_len);
}
}
static InspectionBuffer *DnsQueryGetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms,
Flow *f, struct DnsQueryGetDataArgs *cbdata, int list_id, bool first)
{
SCEnter();
InspectionBufferMultipleForList *fb = InspectionBufferGetMulti(det_ctx, list_id);
InspectionBuffer *buffer = InspectionBufferMultipleForListGet(fb, cbdata->local_id);
if (buffer == NULL)
return NULL;
if (!first && buffer->inspect != NULL)
return buffer;
const uint8_t *data;
uint32_t data_len;
if (rs_dns_tx_get_query_name(cbdata->txv, (uint16_t)cbdata->local_id,
(uint8_t **)&data, &data_len) == 0) {
return NULL;
}
InspectionBufferSetup(buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
SCReturnPtr(buffer, "InspectionBuffer");
}
