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95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/* Copyright (C) 2020 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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/**
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*
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* \author Sascha Steinbiss <sascha@steinbiss.name>
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*
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* Implements the mqtt.connect.username sticky buffer
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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-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-mpm.h"
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#include "detect-engine-prefilter.h"
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#include "detect-mqtt-connect-username.h"
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#include "rust.h"
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#define KEYWORD_NAME "mqtt.connect.username"
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#define KEYWORD_DOC "mqtt-keywords.html#mqtt-connect-username"
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#define BUFFER_NAME "mqtt.connect.username"
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#define BUFFER_DESC "MQTT CONNECT username"
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static int g_buffer_id = 0;
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static int DetectMQTTConnectUsernameSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
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{
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if (DetectBufferSetActiveList(s, g_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_MQTT) < 0)
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return -1;
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return 0;
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}
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms,
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Flow *_f, const uint8_t _flow_flags,
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void *txv, const int list_id)
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{
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InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
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if (buffer->inspect == NULL) {
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const uint8_t *b = NULL;
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uint32_t b_len = 0;
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if (rs_mqtt_tx_get_connect_username(txv, &b, &b_len) != 1)
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return NULL;
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if (b == NULL || b_len == 0)
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return NULL;
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InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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}
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return buffer;
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}
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void DetectMQTTConnectUsernameRegister(void)
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{
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/* mqtt.connect.username sticky buffer */
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sigmatch_table[DETECT_AL_MQTT_CONNECT_USERNAME].name = KEYWORD_NAME;
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sigmatch_table[DETECT_AL_MQTT_CONNECT_USERNAME].desc = "sticky buffer to match on the MQTT CONNECT username";
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sigmatch_table[DETECT_AL_MQTT_CONNECT_USERNAME].url = "/rules/" KEYWORD_DOC;
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sigmatch_table[DETECT_AL_MQTT_CONNECT_USERNAME].Setup = DetectMQTTConnectUsernameSetup;
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sigmatch_table[DETECT_AL_MQTT_CONNECT_USERNAME].flags |= SIGMATCH_NOOPT;
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DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_MQTT,
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SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectBufferGeneric, GetData);
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DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2,
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PrefilterGenericMpmRegister, GetData, ALPROTO_MQTT,
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1);
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DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);
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g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
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SCLogDebug("registering " BUFFER_NAME " rule option");
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}
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