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/* Copyright (C) 2007-2020 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>
*
* Implements the to_md5 transformation keyword
*/
#include "suricata-common.h"
#include "detect.h"
#include "detect-engine.h"
#include "detect-engine-prefilter.h"
#include "detect-parse.h"
#include "detect-transform-md5.h"
#include "util-unittest.h"
#include "util-print.h"
#include "rust.h"
static int DetectTransformToMd5Setup (DetectEngineCtx *, Signature *, const char *);
#ifdef UNITTESTS
static void DetectTransformToMd5RegisterTests(void);
#endif
static void TransformToMd5(InspectionBuffer *buffer, void *options);
void DetectTransformMd5Register(void)
{
sigmatch_table[DETECT_TRANSFORM_MD5].name = "to_md5";
sigmatch_table[DETECT_TRANSFORM_MD5].desc =
"convert to md5 hash of the buffer";
sigmatch_table[DETECT_TRANSFORM_MD5].url =
"/rules/transforms.html#to-md5";
sigmatch_table[DETECT_TRANSFORM_MD5].Setup =
DetectTransformToMd5Setup;
sigmatch_table[DETECT_TRANSFORM_MD5].Transform =
TransformToMd5;
#ifdef UNITTESTS
sigmatch_table[DETECT_TRANSFORM_MD5].RegisterTests =
DetectTransformToMd5RegisterTests;
#endif
sigmatch_table[DETECT_TRANSFORM_MD5].flags |= SIGMATCH_NOOPT;
}
/**
* \internal
* \brief Apply the nocase keyword to the last pattern match, either content or uricontent
* \param det_ctx detection engine ctx
* \param s signature
* \param nullstr should be null
* \retval 0 ok
* \retval -1 failure
*/
static int DetectTransformToMd5Setup (DetectEngineCtx *de_ctx, Signature *s, const char *nullstr)
{
SCEnter();
if (g_disable_hashing) {
SCLogError("MD5 hashing has been disabled, "
"needed for to_md5 keyword");
SCReturnInt(-1);
}
int r = DetectSignatureAddTransform(s, DETECT_TRANSFORM_MD5, NULL);
SCReturnInt(r);
}
static void TransformToMd5(InspectionBuffer *buffer, void *options)
{
const uint8_t *input = buffer->inspect;
const uint32_t input_len = buffer->inspect_len;
uint8_t output[SC_MD5_LEN];
//PrintRawDataFp(stdout, input, input_len);
SCMd5HashBuffer(input, input_len, output, sizeof(output));
InspectionBufferCopy(buffer, output, sizeof(output));
}
#ifdef UNITTESTS
static int DetectTransformToMd5Test01(void)
{
const uint8_t *input = (const uint8_t *)" A B C D ";
uint32_t input_len = strlen((char *)input);
InspectionBuffer buffer;
InspectionBufferInit(&buffer, 8);
InspectionBufferSetup(NULL, -1, &buffer, input, input_len);
PrintRawDataFp(stdout, buffer.inspect, buffer.inspect_len);
TransformToMd5(&buffer, NULL);
PrintRawDataFp(stdout, buffer.inspect, buffer.inspect_len);
InspectionBufferFree(&buffer);
PASS;
}
static void DetectTransformToMd5RegisterTests(void)
{
UtRegisterTest("DetectTransformToMd5Test01",
DetectTransformToMd5Test01);
}
#endif
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