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/* Copyright (C) 2020-2021 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 Sascha Steinbiss <sascha@steinbiss.name>
*/
#include "suricata-common.h"
#include "detect.h"
#include "pkt-var.h"
#include "conf.h"
#include "threads.h"
#include "threadvars.h"
#include "tm-threads.h"
#include "util-unittest.h"
#include "util-buffer.h"
#include "util-debug.h"
#include "util-byte.h"
#include "output.h"
#include "output-json.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-mqtt.h"
#include "output-json-mqtt.h"
#include "rust.h"
#define MQTT_LOG_PASSWORDS BIT_U32(0)
#define MQTT_DEFAULTS (MQTT_LOG_PASSWORDS)
typedef struct LogMQTTFileCtx_ {
uint32_t flags;
OutputJsonCtx *eve_ctx;
} LogMQTTFileCtx;
typedef struct LogMQTTLogThread_ {
LogMQTTFileCtx *mqttlog_ctx;
uint32_t count;
OutputJsonThreadCtx *ctx;
} LogMQTTLogThread;
bool JsonMQTTAddMetadata(const Flow *f, uint64_t tx_id, JsonBuilder *js)
{
MQTTState *state = FlowGetAppState(f);
if (state) {
MQTTTransaction *tx = AppLayerParserGetTx(f->proto, ALPROTO_MQTT, state, tx_id);
if (tx) {
return rs_mqtt_logger_log(tx, MQTT_DEFAULTS, js);
}
}
return false;
}
static int JsonMQTTLogger(ThreadVars *tv, void *thread_data,
const Packet *p, Flow *f, void *state, void *tx, uint64_t tx_id)
{
LogMQTTLogThread *thread = thread_data;
enum OutputJsonLogDirection dir;
if (rs_mqtt_tx_is_toclient((MQTTTransaction*) tx)) {
dir = LOG_DIR_FLOW_TOCLIENT;
} else {
dir = LOG_DIR_FLOW_TOSERVER;
}
JsonBuilder *js = CreateEveHeader(p, dir, "mqtt", NULL, thread->mqttlog_ctx->eve_ctx);
if (unlikely(js == NULL)) {
return TM_ECODE_FAILED;
}
if (!rs_mqtt_logger_log(tx, thread->mqttlog_ctx->flags, js))
goto error;
OutputJsonBuilderBuffer(js, thread->ctx);
jb_free(js);
return TM_ECODE_OK;
error:
jb_free(js);
return TM_ECODE_FAILED;
}
static void OutputMQTTLogDeInitCtxSub(OutputCtx *output_ctx)
{
LogMQTTFileCtx *mqttlog_ctx = (LogMQTTFileCtx *)output_ctx->data;
SCFree(mqttlog_ctx);
SCFree(output_ctx);
}
static void JsonMQTTLogParseConfig(ConfNode *conf, LogMQTTFileCtx *mqttlog_ctx)
{
const char *query = ConfNodeLookupChildValue(conf, "passwords");
if (query != NULL) {
if (ConfValIsTrue(query)) {
mqttlog_ctx->flags |= MQTT_LOG_PASSWORDS;
} else {
mqttlog_ctx->flags &= ~MQTT_LOG_PASSWORDS;
}
} else {
mqttlog_ctx->flags |= MQTT_LOG_PASSWORDS;
}
}
static OutputInitResult OutputMQTTLogInitSub(ConfNode *conf,
OutputCtx *parent_ctx)
{
OutputInitResult result = { NULL, false };
OutputJsonCtx *ajt = parent_ctx->data;
LogMQTTFileCtx *mqttlog_ctx = SCCalloc(1, sizeof(*mqttlog_ctx));
if (unlikely(mqttlog_ctx == NULL)) {
return result;
}
mqttlog_ctx->eve_ctx = ajt;
OutputCtx *output_ctx = SCCalloc(1, sizeof(*output_ctx));
if (unlikely(output_ctx == NULL)) {
SCFree(mqttlog_ctx);
return result;
}
output_ctx->data = mqttlog_ctx;
output_ctx->DeInit = OutputMQTTLogDeInitCtxSub;
JsonMQTTLogParseConfig(conf, mqttlog_ctx);
AppLayerParserRegisterLogger(IPPROTO_TCP, ALPROTO_MQTT);
result.ctx = output_ctx;
result.ok = true;
return result;
}
static TmEcode JsonMQTTLogThreadInit(ThreadVars *t, const void *initdata, void **data)
{
LogMQTTLogThread *thread = SCCalloc(1, sizeof(*thread));
if (unlikely(thread == NULL)) {
return TM_ECODE_FAILED;
}
if (initdata == NULL) {
SCLogDebug("Error getting context for EveLogMQTT. \"initdata\" is NULL.");
SCFree(thread);
return TM_ECODE_FAILED;
}
thread->mqttlog_ctx = ((OutputCtx *)initdata)->data;
thread->ctx = CreateEveThreadCtx(t, thread->mqttlog_ctx->eve_ctx);
if (unlikely(thread->ctx == NULL)) {
SCFree(thread);
return TM_ECODE_FAILED;
}
*data = (void *)thread;
return TM_ECODE_OK;
}
static TmEcode JsonMQTTLogThreadDeinit(ThreadVars *t, void *data)
{
LogMQTTLogThread *thread = (LogMQTTLogThread *)data;
if (thread == NULL) {
return TM_ECODE_OK;
}
FreeEveThreadCtx(thread->ctx);
SCFree(thread);
return TM_ECODE_OK;
}
void JsonMQTTLogRegister(void)
{
OutputRegisterTxSubModule(LOGGER_JSON_TX, "eve-log", "JsonMQTTLog", "eve-log.mqtt",
OutputMQTTLogInitSub, ALPROTO_MQTT, JsonMQTTLogger, JsonMQTTLogThreadInit,
JsonMQTTLogThreadDeinit, NULL);
}
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