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115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/* Copyright (C) 2015 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include "suricata-common.h"
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#include "detect.h"
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#include "detect-engine.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-parse.h"
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#include "detect-base64-data.h"
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#include "detect-engine-build.h"
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#include "util-unittest.h"
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static int DetectBase64DataSetup(DetectEngineCtx *, Signature *, const char *);
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#ifdef UNITTESTS
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static void DetectBase64DataRegisterTests(void);
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#endif
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void DetectBase64DataRegister(void)
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{
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sigmatch_table[DETECT_BASE64_DATA].name = "base64_data";
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sigmatch_table[DETECT_BASE64_DATA].desc =
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"Content match base64 decoded data.";
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sigmatch_table[DETECT_BASE64_DATA].url =
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"/rules/base64-keywords.html#base64-data";
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sigmatch_table[DETECT_BASE64_DATA].Setup = DetectBase64DataSetup;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_BASE64_DATA].RegisterTests =
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DetectBase64DataRegisterTests;
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#endif
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sigmatch_table[DETECT_BASE64_DATA].flags |= SIGMATCH_NOOPT;
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}
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static int DetectBase64DataSetup(DetectEngineCtx *de_ctx, Signature *s,
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const char *str)
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{
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SigMatch *pm = NULL;
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/* Check for a preceding base64_decode. */
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pm = SCDetectGetLastSMFromLists(s, DETECT_BASE64_DECODE, -1);
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if (pm == NULL) {
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SCLogError("\"base64_data\" keyword seen without preceding base64_decode.");
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return -1;
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}
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s->init_data->list = DETECT_SM_LIST_BASE64_DATA;
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return 0;
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}
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#ifdef UNITTESTS
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static int g_file_data_buffer_id = 0;
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static int DetectBase64DataSetupTest01(void)
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{
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DetectEngineCtx *de_ctx = DetectEngineCtxInit();
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FAIL_IF_NULL(de_ctx);
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de_ctx->flags |= DE_QUIET;
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Signature *s = DetectEngineAppendSig(de_ctx,
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"alert smtp any any -> any any (msg:\"DetectBase64DataSetupTest\"; "
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"base64_decode; base64_data; content:\"content\"; sid:1; rev:1;)");
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FAIL_IF_NULL(s);
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SigMatch *sm = s->init_data->smlists[DETECT_SM_LIST_PMATCH];
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FAIL_IF_NULL(sm);
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FAIL_IF_NOT(sm->type == DETECT_BASE64_DECODE);
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FAIL_IF_NULL(s->init_data->smlists[DETECT_SM_LIST_BASE64_DATA]);
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DetectEngineCtxFree(de_ctx);
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PASS;
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}
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/**
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* \test Test that the list can be changed to post-detection lists
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* after the base64 keyword.
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*/
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static int DetectBase64DataSetupTest04(void)
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{
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DetectEngineCtx *de_ctx = DetectEngineCtxInit();
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FAIL_IF_NULL(de_ctx);
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de_ctx->flags |= DE_QUIET;
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Signature *s = DetectEngineAppendSig(de_ctx,
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"alert tcp any any -> any any (msg:\"some b64thing\"; flow:established,from_server; "
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"file_data; content:\"sometext\"; fast_pattern; base64_decode:relative; base64_data; "
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"content:\"foobar\"; nocase; tag:session,120,seconds; sid:1111111; rev:1;)");
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FAIL_IF_NULL(s);
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DetectEngineCtxFree(de_ctx);
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PASS;
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}
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static void DetectBase64DataRegisterTests(void)
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{
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g_file_data_buffer_id = DetectBufferTypeGetByName("file_data");
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UtRegisterTest("DetectBase64DataSetupTest01", DetectBase64DataSetupTest01);
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UtRegisterTest("DetectBase64DataSetupTest04", DetectBase64DataSetupTest04);
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}
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#endif /* UNITTESTS */ |