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/* Copyright (C) 2007-2016 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>
* \author Duarte Silva <duarte.silva@serializing.me>
*
*/
#include "suricata-common.h"
#include "detect-engine.h"
#include "detect-file-hash-common.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "detect-filesha256.h"
static int DetectFileSha256Setup (DetectEngineCtx *, Signature *, const char *);
#ifdef UNITTESTS
static void DetectFileSha256RegisterTests(void);
#endif
static int g_file_match_list_id = 0;
/**
* \brief Registration function for keyword: filesha256
*/
void DetectFileSha256Register(void)
{
sigmatch_table[DETECT_FILESHA256].name = "filesha256";
sigmatch_table[DETECT_FILESHA256].desc = "match file SHA-256 against list of SHA-256 checksums";
sigmatch_table[DETECT_FILESHA256].url = "/rules/file-keywords.html#filesha256";
sigmatch_table[DETECT_FILESHA256].FileMatch = DetectFileHashMatch;
sigmatch_table[DETECT_FILESHA256].Setup = DetectFileSha256Setup;
sigmatch_table[DETECT_FILESHA256].Free = DetectFileHashFree;
#ifdef UNITTESTS
sigmatch_table[DETECT_FILESHA256].RegisterTests = DetectFileSha256RegisterTests;
#endif
g_file_match_list_id = DetectBufferTypeRegister("files");
SCLogDebug("registering filesha256 rule option");
return;
}
/**
* \brief this function is used to parse filesha256 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 "filesha256" option
*
* \retval 0 on Success
* \retval -1 on Failure
*/
static int DetectFileSha256Setup (DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
return DetectFileHashSetup(de_ctx, s, str, DETECT_FILESHA256, g_file_match_list_id);
}
#ifdef UNITTESTS
static int SHA256MatchLookupString(ROHashTable *hash, const char *string)
{
uint8_t sha256[32];
if (ReadHashString(sha256, string, "file", 88, 64) == 1) {
void *ptr = ROHashLookup(hash, &sha256, (uint16_t)sizeof(sha256));
if (ptr == NULL)
return 0;
else
return 1;
}
return 0;
}
static int SHA256MatchTest01(void)
{
ROHashTable *hash = ROHashInit(4, 32);
FAIL_IF_NULL(hash);
FAIL_IF(LoadHashTable(hash, "9c891edb5da763398969b6aaa86a5d46971bd28a455b20c2067cb512c9f9a0f8",
"file", 1, DETECT_FILESHA256) != 1);
FAIL_IF(LoadHashTable(hash, "6eee51705f34b6cfc7f0c872a7949ec3e3172a908303baf5d67d03b98f70e7e3",
"file", 2, DETECT_FILESHA256) != 1);
FAIL_IF(LoadHashTable(hash, "b12c7d57507286bbbe36d7acf9b34c22c96606ffd904e3c23008399a4a50c047",
"file", 3, DETECT_FILESHA256) != 1);
FAIL_IF(LoadHashTable(hash, "ca496e1ddadc290050339dd75ce8830ad3028ce1556a5368874a4aec3aee114b",
"file", 4, DETECT_FILESHA256) != 1);
FAIL_IF(LoadHashTable(hash, "275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f",
"file", 5, DETECT_FILESHA256) != 1);
FAIL_IF(LoadHashTable(hash, "d765e722e295969c0a5c2d90f549db8b89ab617900bf4698db41c7cdad993bb9",
"file", 6, DETECT_FILESHA256) != 1);
FAIL_IF(ROHashInitFinalize(hash) != 1);
FAIL_IF(SHA256MatchLookupString(
hash, "9c891edb5da763398969b6aaa86a5d46971bd28a455b20c2067cb512c9f9a0f8") != 1);
FAIL_IF(SHA256MatchLookupString(
hash, "6eee51705f34b6cfc7f0c872a7949ec3e3172a908303baf5d67d03b98f70e7e3") != 1);
FAIL_IF(SHA256MatchLookupString(
hash, "b12c7d57507286bbbe36d7acf9b34c22c96606ffd904e3c23008399a4a50c047") != 1);
FAIL_IF(SHA256MatchLookupString(
hash, "ca496e1ddadc290050339dd75ce8830ad3028ce1556a5368874a4aec3aee114b") != 1);
FAIL_IF(SHA256MatchLookupString(
hash, "275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f") != 1);
FAIL_IF(SHA256MatchLookupString(
hash, "d765e722e295969c0a5c2d90f549db8b89ab617900bf4698db41c7cdad993bb9") != 1);
/* Shouldn't match */
FAIL_IF(SHA256MatchLookupString(
hash, "3333333333333333333333333333333333333333333333333333333333333333") == 1);
ROHashFree(hash);
PASS;
}
void DetectFileSha256RegisterTests(void)
{
UtRegisterTest("SHA256MatchTest01", SHA256MatchTest01);
}
#endif
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