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/* Copyright (C) 2022 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.
*/
/**
*
* Implements the quic.ua
*/
#include "suricata-common.h"
#include "conf.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-prefilter.h"
#include "detect-engine-mpm.h"
#include "detect-engine-content-inspection.h"
#include "detect-engine-uint.h"
#include "detect-quic-ua.h"
#include "util-byte.h"
#include "util-unittest.h"
#include "rust.h"
#ifdef UNITTESTS
static void DetectQuicUaRegisterTests(void);
#endif
#define BUFFER_NAME "quic_ua"
#define KEYWORD_NAME "quic.ua"
#define KEYWORD_ID DETECT_AL_QUIC_UA
static int quic_ua_id = 0;
static int DetectQuicUaSetup(DetectEngineCtx *, Signature *, const char *);
static InspectionBuffer *GetUaData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
const int list_id)
{
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
uint32_t b_len = 0;
const uint8_t *b = NULL;
if (rs_quic_tx_get_ua(txv, &b, &b_len) != 1)
return NULL;
if (b == NULL || b_len == 0)
return NULL;
InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
/**
* \brief Registration function for quic.ua: keyword
*/
void DetectQuicUaRegister(void)
{
sigmatch_table[DETECT_AL_QUIC_UA].name = KEYWORD_NAME;
sigmatch_table[DETECT_AL_QUIC_UA].desc = "match Quic ua";
sigmatch_table[DETECT_AL_QUIC_UA].url = "/rules/quic-keywords.html#quic-ua";
sigmatch_table[DETECT_AL_QUIC_UA].Setup = DetectQuicUaSetup;
sigmatch_table[DETECT_AL_QUIC_UA].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
#ifdef UNITTESTS
sigmatch_table[DETECT_AL_QUIC_UA].RegisterTests = DetectQuicUaRegisterTests;
#endif
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
GetUaData, ALPROTO_QUIC, 1);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_QUIC, SIG_FLAG_TOSERVER, 1,
DetectEngineInspectBufferGeneric, GetUaData);
quic_ua_id = DetectBufferTypeGetByName(BUFFER_NAME);
}
/**
* \internal
* \brief this function is used to add the parsed sigmatch into the current signature
*
* \param de_ctx pointer to the Detection Engine Context
* \param s pointer to the Current Signature
* \param rawstr pointer to the user provided options
*
* \retval 0 on Success
* \retval -1 on Failure
*/
static int DetectQuicUaSetup(DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
{
if (DetectBufferSetActiveList(de_ctx, s, quic_ua_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_QUIC) < 0)
return -1;
return 0;
}
#ifdef UNITTESTS
/**
* \test QuicUaTestParse01 is a test for a valid value
*
* \retval 1 on success
* \retval 0 on failure
*/
static int QuicUaTestParse01(void)
{
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
Signature *sig = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (quic.ua; content:\"googe.com\"; sid:1; rev:1;)");
FAIL_IF_NULL(sig);
sig = DetectEngineAppendSig(
de_ctx, "alert ip any any -> any any (quic.ua; content:\"|00|\"; sid:2; rev:1;)");
FAIL_IF_NULL(sig);
DetectEngineCtxFree(de_ctx);
PASS;
}
/**
* \test QuicUaTestParse03 is a test for an invalid value
*
* \retval 1 on success
* \retval 0 on failure
*/
static int QuicUaTestParse03(void)
{
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
Signature *sig =
DetectEngineAppendSig(de_ctx, "alert ip any any -> any any (quic.ua:; sid:1; rev:1;)");
FAIL_IF_NOT_NULL(sig);
DetectEngineCtxFree(de_ctx);
PASS;
}
/**
* \brief this function registers unit tests for QuicUa
*/
void DetectQuicUaRegisterTests(void)
{
UtRegisterTest("QuicUaTestParse01", QuicUaTestParse01);
UtRegisterTest("QuicUaTestParse03", QuicUaTestParse03);
}
#endif /* UNITTESTS */
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