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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 "threads.h"
#include "debug.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-mpm.h"
#include "detect-engine-state.h"
#include "flow.h"
#include "flow-var.h"
#include "flow-util.h"
#include "util-debug.h"
#include "util-spm-bm.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
static int DetectFiledataSetup (DetectEngineCtx *, Signature *, char *);
static void DetectFiledataRegisterTests(void);
/**
* \brief Registration function for keyword: file_data
*/
void DetectFiledataRegister(void)
{
sigmatch_table[DETECT_FILE_DATA].name = "file_data";
sigmatch_table[DETECT_FILE_DATA].desc = "make content keywords match on HTTP response body";
sigmatch_table[DETECT_FILE_DATA].url = "https://redmine.openinfosecfoundation.org/projects/suricata/wiki/HTTP-keywords#file_data";
sigmatch_table[DETECT_FILE_DATA].Match = NULL;
sigmatch_table[DETECT_FILE_DATA].AppLayerMatch = NULL;
sigmatch_table[DETECT_FILE_DATA].alproto = ALPROTO_HTTP;
sigmatch_table[DETECT_FILE_DATA].Setup = DetectFiledataSetup;
sigmatch_table[DETECT_FILE_DATA].Free = NULL;
sigmatch_table[DETECT_FILE_DATA].RegisterTests = DetectFiledataRegisterTests;
sigmatch_table[DETECT_FILE_DATA].flags = SIGMATCH_NOOPT;
}
/**
* \brief this function is used to parse filedata options
* \brief into the current signature
*
* \param de_ctx pointer to the Detection Engine Context
* \param s pointer to the Current Signature
* \param str pointer to the user provided "filestore" option
*
* \retval 0 on Success
* \retval -1 on Failure
*/
static int DetectFiledataSetup (DetectEngineCtx *de_ctx, Signature *s, char *str)
{
SCEnter();
if (!DetectProtoContainsProto(&s->proto, IPPROTO_TCP) &&
s->alproto != ALPROTO_UNKNOWN && s->alproto != ALPROTO_HTTP &&
s->alproto != ALPROTO_SMTP) {
SCLogError(SC_ERR_CONFLICTING_RULE_KEYWORDS, "rule contains conflicting keywords.");
return -1;
}
if (s->alproto == ALPROTO_HTTP && (s->init_flags & SIG_FLAG_INIT_FLOW) &&
(s->flags & SIG_FLAG_TOSERVER) && !(s->flags & SIG_FLAG_TOCLIENT)) {
SCLogError(SC_ERR_INVALID_SIGNATURE, "Can't use file_data with flow:to_server or from_client with http.");
return -1;
}
if (s->alproto == ALPROTO_SMTP && (s->init_flags & SIG_FLAG_INIT_FLOW) &&
!(s->flags & SIG_FLAG_TOSERVER) && (s->flags & SIG_FLAG_TOCLIENT)) {
SCLogError(SC_ERR_INVALID_SIGNATURE, "Can't use file_data with flow:to_client or from_server with smtp.");
return -1;
}
s->list = DETECT_SM_LIST_FILEDATA;
return 0;
}
#ifdef UNITTESTS
static int DetectFiledataParseTest01(void)
{
DetectEngineCtx *de_ctx = NULL;
int result = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert smtp any any -> any any "
"(msg:\"test\"; file_data; content:\"abc\"; sid:1;)");
if (de_ctx->sig_list == NULL) {
printf("sig parse failed: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_PMATCH] != NULL) {
printf("content is still in FILEDATA list: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_FILEDATA] == NULL) {
printf("content not in FILEDATA list: ");
goto end;
}
result = 1;
end:
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
return result;
}
static int DetectFiledataParseTest02(void)
{
DetectEngineCtx *de_ctx = NULL;
int result = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any any "
"(msg:\"test\"; file_data; content:\"abc\"; sid:1;)");
if (de_ctx->sig_list == NULL) {
printf("sig parse failed: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_PMATCH] != NULL) {
printf("content is still in PMATCH list: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_FILEDATA] == NULL) {
printf("content not in FILEDATA list: ");
goto end;
}
result = 1;
end:
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
return result;
}
static int DetectFiledataParseTest03(void)
{
DetectEngineCtx *de_ctx = NULL;
int result = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert tcp any any -> any 25 "
"(msg:\"test\"; flow:to_server,established; file_data; content:\"abc\"; sid:1;)");
if (de_ctx->sig_list == NULL) {
printf("sig parse failed: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_PMATCH] != NULL) {
printf("content is still in PMATCH list: ");
goto end;
}
if (de_ctx->sig_list->sm_lists[DETECT_SM_LIST_FILEDATA] == NULL) {
printf("content not in FILEDATA list: ");
goto end;
}
result = 1;
end:
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
return result;
}
static int DetectFiledataParseTest04(void)
{
DetectEngineCtx *de_ctx = NULL;
int result = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert smtp any any -> any any "
"(msg:\"test\"; flow:to_client,established; file_data; content:\"abc\"; sid:1;)");
if (de_ctx->sig_list == NULL) {
printf("sig parse failed: ");
goto end;
}
result = 1;
end:
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
return result;
}
static int DetectFiledataParseTest05(void)
{
DetectEngineCtx *de_ctx = NULL;
int result = 0;
de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx,
"alert http any any -> any any "
"(msg:\"test\"; flow:to_server,established; file_data; content:\"abc\"; sid:1;)");
if (de_ctx->sig_list == NULL) {
printf("sig parse failed: ");
goto end;
}
result = 1;
end:
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineCtxFree(de_ctx);
return result;
}
#endif
void DetectFiledataRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("DetectFiledataParseTest01", DetectFiledataParseTest01, 1);
UtRegisterTest("DetectFiledataParseTest02", DetectFiledataParseTest02, 1);
UtRegisterTest("DetectFiledataParseTest03", DetectFiledataParseTest03, 1);
UtRegisterTest("DetectFiledataParseTest04", DetectFiledataParseTest04, 0);
UtRegisterTest("DetectFiledataParseTest05", DetectFiledataParseTest05, 0);
#endif
}
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