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/* Copyright (C) 2007-2011 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-uri.h"
#include "detect-engine-hcbd.h"
#include "detect-engine-hhd.h"
#include "detect-engine-hrhd.h"
#include "detect-engine-hmd.h"
#include "detect-engine-hcd.h"
#include "detect-engine-hrud.h"
#include "detect-engine-dcepayload.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-smb.h"
#include "app-layer-dcerpc-common.h"
#include "app-layer-dcerpc.h"
#include "app-layer-smtp.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-profiling.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
*
* \note flow is not locked at this time
*/
static int DetectFileInspect(ThreadVars *tv, DetectEngineThreadCtx *det_ctx,
Flow *f, Signature *s, uint8_t flags, FileContainer *ffc)
{
SigMatch *sm = NULL;
int r = 0;
int match = 0;
int store_r = 0;
KEYWORD_PROFILING_SET_LIST(det_ctx, DETECT_SM_LIST_FILEMATCH);
SCLogDebug("file inspection... %p", ffc);
if (ffc != NULL) {
File *file = ffc->head;
for (; file != NULL; file = file->next) {
SCLogDebug("file");
if (file->state == FILE_STATE_NONE) {
SCLogDebug("file state FILE_STATE_NONE");
continue;
}
if (file->txid < det_ctx->tx_id) {
SCLogDebug("file->txid < det_ctx->tx_id == %"PRIu64" < %"PRIu64, file->txid, det_ctx->tx_id);
continue;
}
if (file->txid > det_ctx->tx_id) {
SCLogDebug("file->txid > det_ctx->tx_id == %"PRIu64" > %"PRIu64, file->txid, det_ctx->tx_id);
break;
}
if ((s->file_flags & FILE_SIG_NEED_FILENAME) && file->name == NULL) {
SCLogDebug("sig needs filename, but we don't have any");
r = 0;
break;
}
if ((s->file_flags & FILE_SIG_NEED_MAGIC) && file->chunks_head == NULL) {
SCLogDebug("sig needs file content, but we don't have any");
r = 0;
break;
}
if ((s->file_flags & FILE_SIG_NEED_FILECONTENT) && file->chunks_head == NULL) {
SCLogDebug("sig needs file content, but we don't have any");
r = 0;
break;
}
if ((s->file_flags & FILE_SIG_NEED_MD5) && (!(file->flags & FILE_MD5))) {
SCLogDebug("sig needs file md5, but we don't have any");
r = 0;
break;
}
if ((s->file_flags & FILE_SIG_NEED_SIZE) && file->state < FILE_STATE_CLOSED) {
SCLogDebug("sig needs filesize, but state < FILE_STATE_CLOSED");
r = 0;
break;
}
/* run the file match functions. */
for (sm = s->sm_lists[DETECT_SM_LIST_FILEMATCH]; sm != NULL; sm = sm->next) {
SCLogDebug("sm %p, sm->next %p", sm, sm->next);
if (sigmatch_table[sm->type].FileMatch != NULL) {
KEYWORD_PROFILING_START;
match = sigmatch_table[sm->type].
FileMatch(tv, det_ctx, f, flags, file, s, sm);
KEYWORD_PROFILING_END(det_ctx, sm->type, (match > 0));
if (match == 0) {
r = 2;
break;
} else if (sm->next == NULL) {
r = 1;
break;
}
}
}
/* 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 == 1)
store_r = 1;
/* if this is a filestore sig, and the sig can't match
* return 3 so we can distinguish */
if ((s->flags & SIG_FLAG_FILESTORE) && r == 2)
r = 3;
/* continue, this file may (or may not) be unable to match
* maybe we have more that can :) */
}
} else {
/* if we have a filestore sm with a scope > file (so tx, ssn) we
* run it here */
sm = s->sm_lists[DETECT_SM_LIST_FILEMATCH];
if (sm != NULL && sm->next == NULL && sm->type == DETECT_FILESTORE &&
sm->ctx != NULL)
{
DetectFilestoreData *fd = (DetectFilestoreData *)sm->ctx;
if (fd->scope > FILESTORE_SCOPE_DEFAULT) {
KEYWORD_PROFILING_START;
match = sigmatch_table[sm->type].
FileMatch(tv, det_ctx, f, flags, /* no file */NULL, s, sm);
KEYWORD_PROFILING_END(det_ctx, sm->type, (match > 0));
if (match == 1) {
r = 1;
}
}
}
}
if (store_r == 1)
r = 1;
SCReturnInt(r);
}
/**
* \brief Inspect the file inspecting keywords against the HTTP transactions.
*
* \param tv thread vars
* \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 should be locked when this function's called.
*/
int DetectFileInspectHttp(ThreadVars *tv,
DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
Signature *s, Flow *f, uint8_t flags, void *alstate,
void *tx, uint64_t tx_id)
{
int r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
FileContainer *ffc;
HtpState *htp_state = (HtpState *)alstate;
if (flags & STREAM_TOCLIENT)
ffc = htp_state->files_tc;
else
ffc = htp_state->files_ts;
int match = DetectFileInspect(tv, det_ctx, f, s, flags, ffc);
if (match == 1) {
r = DETECT_ENGINE_INSPECT_SIG_MATCH;
} else if (match == 2) {
if (r != 1) {
SCLogDebug("sid %u can't match on this transaction", s->id);
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
}
} else if (match == 3) {
if (r != 1) {
SCLogDebug("sid %u can't match on this transaction (filestore sig)", s->id);
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILESTORE;
}
}
return r;
}
/**
* \brief Inspect the file inspecting keywords against the SMTP transactions.
*
* \param tv thread vars
* \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
*/
int DetectFileInspectSmtp(ThreadVars *tv,
DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
Signature *s, Flow *f, uint8_t flags, void *alstate,
void *tx, uint64_t tx_id)
{
SCEnter();
int r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
SMTPState *smtp_state = NULL;
FileContainer *ffc;
smtp_state = (SMTPState *)alstate;
if (smtp_state == NULL) {
SCLogDebug("no SMTP state");
goto end;
}
if (flags & STREAM_TOSERVER)
ffc = smtp_state->files_ts;
else
goto end;
int match = DetectFileInspect(tv, det_ctx, f, s, flags, ffc);
if (match == 1) {
r = DETECT_ENGINE_INSPECT_SIG_MATCH;
} else if (match == 2) {
if (r != 1) {
SCLogDebug("sid %u can't match on this transaction", s->id);
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
}
} else if (match == 3) {
if (r != 1) {
SCLogDebug("sid %u can't match on this transaction (filestore sig)", s->id);
r = DETECT_ENGINE_INSPECT_SIG_CANT_MATCH_FILESTORE;
}
}
end:
SCReturnInt(r);
}
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