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/* Copyright (C) 2007-2021 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 Victor Julien <victor@inliniac.net>
*/
#include "suricata-common.h"
#include "decode.h"
#include "detect.h"
#include "detect-engine.h"
#include "detect-parse.h"
#include "detect-engine-state.h"
#include "detect-filestore.h"
#include "detect-engine-dcepayload.h"
#include "detect-engine-file.h"
#include "stream-tcp.h"
#include "stream-tcp-private.h"
#include "stream-tcp-reassemble.h"
#include "app-layer-parser.h"
#include "app-layer-protos.h"
#include "app-layer-htp.h"
#include "app-layer-smtp.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-profiling.h"
#include "util-validate.h"
/**
* \brief Inspect the file inspecting keywords.
*
* \param tv thread vars
* \param det_ctx detection engine thread ctx
* \param f flow
* \param s signature to inspect
*
* \retval 0 no match
* \retval 1 match
* \retval 2 can't match
* \retval 3 can't match filestore signature
*/
static uint8_t DetectFileInspect(DetectEngineThreadCtx *det_ctx, Flow *f, const Signature *s,
const SigMatchData *smd, uint8_t flags, FileContainer *ffc)
{
uint8_t r = 0;
int match = 0;
int store_r = 0;
SCLogDebug("file inspection... %p", ffc);
for (File *file = ffc->head; file != NULL; file = file->next) {
SCLogDebug("file");
if (file->state == FILE_STATE_NONE) {
SCLogDebug("file state FILE_STATE_NONE");
continue;
}
if ((s->file_flags & FILE_SIG_NEED_FILENAME) && file->name == NULL) {
SCLogDebug("sig needs filename, but we don't have any");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
uint64_t file_size = FileDataSize(file);
if ((s->file_flags & FILE_SIG_NEED_MAGIC) && file_size == 0) {
SCLogDebug("sig needs file content, but we don't have any");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
if ((s->file_flags & FILE_SIG_NEED_FILECONTENT) && file_size == 0) {
SCLogDebug("sig needs file content, but we don't have any");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
if ((s->file_flags & FILE_SIG_NEED_MD5) && (!(file->flags & FILE_MD5))) {
SCLogDebug("sig needs file md5, but we don't have any");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
if ((s->file_flags & FILE_SIG_NEED_SHA1) && (!(file->flags & FILE_SHA1))) {
SCLogDebug("sig needs file sha1, but we don't have any");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
if ((s->file_flags & FILE_SIG_NEED_SHA256) && (!(file->flags & FILE_SHA256))) {
SCLogDebug("sig needs file sha256, but we don't have any");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
if ((s->file_flags & FILE_SIG_NEED_SIZE) && file->state < FILE_STATE_CLOSED) {
SCLogDebug("sig needs filesize, but state < FILE_STATE_CLOSED");
r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
continue;
}
/* run the file match functions. */
while (1) {
SCLogDebug("smd %p", smd);
if (sigmatch_table[smd->type].FileMatch != NULL) {
KEYWORD_PROFILING_START;
match = sigmatch_table[smd->type].FileMatch(det_ctx, f, flags, file, s, smd->ctx);
KEYWORD_PROFILING_END(det_ctx, smd->type, (match > 0));
if (match == 0) {
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILES;
break;
} else if (smd->is_last) {
r = DETECT_ENGINE_INSPECT_SIG_MATCH;
break;
}
}
if (smd->is_last)
break;
smd++;
}
/* continue inspection for other files as we may want to store
* those as well. We'll return 1 (match) regardless of their
* results though */
if (r == DETECT_ENGINE_INSPECT_SIG_MATCH)
store_r = DETECT_ENGINE_INSPECT_SIG_MATCH;
/* continue, this file may (or may not) be unable to match
* maybe we have more that can :) */
}
if (r == DETECT_ENGINE_INSPECT_SIG_NO_MATCH && store_r == DETECT_ENGINE_INSPECT_SIG_MATCH) {
SCLogDebug("stored MATCH, current file NOMATCH");
SCReturnInt(DETECT_ENGINE_INSPECT_SIG_MATCH_MORE_FILES);
}
if (store_r == DETECT_ENGINE_INSPECT_SIG_MATCH)
r = DETECT_ENGINE_INSPECT_SIG_MATCH;
SCReturnInt(r);
}
/**
* \brief Inspect the file inspecting keywords against the state
*
* \param det_ctx detection engine thread ctx
* \param f flow
* \param s signature to inspect
* \param alstate state
* \param flags direction flag
*
* \retval 0 no match
* \retval 1 match
* \retval 2 can't match
* \retval 3 can't match filestore signature
*
* \note flow is not locked at this time
*/
uint8_t DetectFileInspectGeneric(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
const struct DetectEngineAppInspectionEngine_ *engine, const Signature *s, Flow *f,
uint8_t flags, void *alstate, void *tx, uint64_t tx_id)
{
SCEnter();
DEBUG_VALIDATE_BUG_ON(f->alstate != alstate);
const uint8_t direction = flags & (STREAM_TOSERVER|STREAM_TOCLIENT);
AppLayerGetFileState files = AppLayerParserGetTxFiles(f, alstate, tx, direction);
FileContainer *ffc = files.fc;
SCLogDebug("tx %p tx_id %" PRIu64 " ffc %p ffc->head %p sid %u", tx, tx_id, ffc,
ffc ? ffc->head : NULL, s->id);
if (ffc == NULL) {
SCReturnInt(DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILES);
} else if (ffc->head == NULL) {
SCReturnInt(DETECT_ENGINE_INSPECT_SIG_NO_MATCH);
}
uint8_t r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
uint8_t match = DetectFileInspect(det_ctx, f, s, engine->smd, flags, ffc);
if (match == DETECT_ENGINE_INSPECT_SIG_MATCH) {
r = DETECT_ENGINE_INSPECT_SIG_MATCH;
} else if (match == DETECT_ENGINE_INSPECT_SIG_CANT_MATCH) {
SCLogDebug("sid %u can't match on this transaction", s->id);
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
} else if (match == DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILES) {
SCLogDebug("sid %u can't match on this transaction (file sig)", s->id);
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILES;
} else if (match == DETECT_ENGINE_INSPECT_SIG_MATCH_MORE_FILES) {
SCLogDebug("match with more files ahead");
r = match;
}
SCReturnInt(r);
}
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