mirror of https://github.com/OISF/suricata
added support to log dropped packet as netfilter logs while in inline mode
Gurvinder Singh
15 years ago
committed by
Victor Julien
parent
1681705e62
commit
7d0781b349
@ -0,0 +1,538 @@
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/* Copyright (C) 2007-2011 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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* \file
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*
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* \author Gurvinder Singh <gurvindersinghdahiya@gmail.com>
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*
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* Drop log module to log the dropped packet information
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*
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*/
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#include "suricata-common.h"
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#include "debug.h"
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#include "detect.h"
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#include "flow.h"
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#include "conf.h"
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#include "threads.h"
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#include "tm-threads.h"
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#include "threadvars.h"
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#include "tm-modules.h"
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#include "util-debug.h"
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#include "decode-ipv4.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-reference.h"
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#include "output.h"
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#include "log-droplog.h"
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#include "util-unittest.h"
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#include "util-unittest-helper.h"
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#include "util-classification-config.h"
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#include "util-mpm-b2g-cuda.h"
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#include "util-cuda-handlers.h"
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#include "util-privs.h"
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#include "util-print.h"
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#include "util-proto-name.h"
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#define DEFAULT_LOG_FILENAME "drop.log"
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#define MODULE_NAME "LogDropLog"
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TmEcode LogDropLog (ThreadVars *, Packet *, void *, PacketQueue *, PacketQueue *);
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TmEcode LogDropLogNetFilter(ThreadVars *, Packet *, void *, PacketQueue *, PacketQueue *);
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TmEcode LogDropLogIPv6(ThreadVars *, Packet *, void *, PacketQueue *, PacketQueue *);
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TmEcode LogDropLogDecoderEvent(ThreadVars *, Packet *, void *, PacketQueue *, PacketQueue *);
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TmEcode LogDropLogThreadInit(ThreadVars *, void *, void **);
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TmEcode LogDropLogThreadDeinit(ThreadVars *, void *);
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OutputCtx *LogDropLogInitCtx(ConfNode *);
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static void LogDropLogDeInitCtx(OutputCtx *);
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static int LogDropLogOpenFileCtx(LogFileCtx *, const char *, const char *);
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void LogDropLogRegisterTests(void);
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void LogDropLogExitPrintStats(ThreadVars *, void *);
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/** \brief function to register the drop log module */
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void TmModuleLogDropLogRegister (void) {
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tmm_modules[TMM_LOGDROPLOG].name = MODULE_NAME;
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tmm_modules[TMM_LOGDROPLOG].ThreadInit = LogDropLogThreadInit;
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tmm_modules[TMM_LOGDROPLOG].Func = LogDropLog;
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tmm_modules[TMM_LOGDROPLOG].ThreadExitPrintStats = LogDropLogExitPrintStats;
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tmm_modules[TMM_LOGDROPLOG].ThreadDeinit = LogDropLogThreadDeinit;
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tmm_modules[TMM_LOGDROPLOG].RegisterTests = LogDropLogRegisterTests;
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tmm_modules[TMM_LOGDROPLOG].cap_flags = 0;
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OutputRegisterModule(MODULE_NAME, "drop", LogDropLogInitCtx);
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}
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typedef struct LogDropLogThread_ {
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/** LogFileCtx has the pointer to the file and a mutex to allow multithreading */
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LogFileCtx* file_ctx;
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uint64_t drop_cnt;
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} LogDropLogThread;
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/**
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* \brief Initialize the droplog thread
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* \param t Pointer the current thread variable
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* \param initdata pointer to the output context
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* \param data Pointer to the pointer to droplog thread to be initialized
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*
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* \return TM_ECODE_OK on success
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*/
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TmEcode LogDropLogThreadInit(ThreadVars *t, void *initdata, void **data)
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{
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LogDropLogThread *dlt = SCMalloc(sizeof(LogDropLogThread));
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if (dlt == NULL)
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return TM_ECODE_FAILED;
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memset(dlt, 0, sizeof(LogDropLogThread));
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if(initdata == NULL)
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{
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SCLogDebug("Error getting context for LogDropLog. \"initdata\" argument NULL");
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SCFree(dlt);
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return TM_ECODE_FAILED;
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}
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/** Use the Ouptut Context (file pointer and mutex) */
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dlt->file_ctx = ((OutputCtx *)initdata)->data;
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*data = (void *)dlt;
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return TM_ECODE_OK;
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}
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/**
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* \brief Deinitialize the droplog thread
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* \param t Pointer the current thread variable
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* \param data Pointer to the droplog thread to be cleared
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*
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* \return TM_ECODE_OK on success
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*/
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TmEcode LogDropLogThreadDeinit(ThreadVars *t, void *data)
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{
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LogDropLogThread *dlt = (LogDropLogThread *)data;
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if (dlt == NULL) {
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return TM_ECODE_OK;
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}
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/* clear memory */
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memset(dlt, 0, sizeof(LogDropLogThread));
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SCFree(dlt);
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return TM_ECODE_OK;
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}
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/**
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* \brief Create a new LogFileCtx for "drop" output style.
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* \param conf The configuration node for this output.
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* \return A LogFileCtx pointer on success, NULL on failure.
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*/
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OutputCtx *LogDropLogInitCtx(ConfNode *conf)
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{
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const char *enable = ConfNodeLookupChildValue(conf, "enabled");
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if (enable == NULL || strncmp (enable, "no", 2) == 0) {
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return NULL;
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}
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LogFileCtx *logfile_ctx = LogFileNewCtx();
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if (logfile_ctx == NULL) {
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SCLogDebug("LogDropLogInitCtx: Could not create new LogFileCtx");
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return NULL;
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}
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const char *filename = ConfNodeLookupChildValue(conf, "filename");
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if (filename == NULL)
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filename = DEFAULT_LOG_FILENAME;
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const char *mode = ConfNodeLookupChildValue(conf, "append");
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if (mode == NULL)
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mode = DEFAULT_LOG_MODE_APPEND;
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if (LogDropLogOpenFileCtx(logfile_ctx, filename, mode) < 0) {
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LogFileFreeCtx(logfile_ctx);
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return NULL;
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}
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OutputCtx *output_ctx = SCCalloc(1, sizeof(OutputCtx));
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if (output_ctx == NULL)
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return NULL;
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output_ctx->data = logfile_ctx;
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output_ctx->DeInit = LogDropLogDeInitCtx;
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SCLogInfo("Drop log output initialized, filename: %s", filename);
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return output_ctx;
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}
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/**
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* \brief Destroy the LogFileCtx and cleared "drop" output module
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*
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* \param output_ctx pointer the output context to be cleared
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*/
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static void LogDropLogDeInitCtx(OutputCtx *output_ctx)
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{
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LogFileCtx *logfile_ctx = (LogFileCtx *)output_ctx->data;
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LogFileFreeCtx(logfile_ctx);
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free(output_ctx);
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}
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/** \brief Read the config set the file pointer, open the file
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* \param file_ctx pointer to a created LogFileCtx using LogFileNewCtx()
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* \param filename name of log file
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* \return -1 if failure, 0 if succesful
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* */
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static int LogDropLogOpenFileCtx(LogFileCtx *file_ctx, const char *filename,
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const char *mode)
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{
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char log_path[PATH_MAX];
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char *log_dir;
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if (ConfGet("default-log-dir", &log_dir) != 1)
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log_dir = DEFAULT_LOG_DIR;
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snprintf(log_path, PATH_MAX, "%s/%s", log_dir, filename);
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if (strcasecmp(mode, "yes") == 0) {
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file_ctx->fp = fopen(log_path, "a");
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} else {
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file_ctx->fp = fopen(log_path, "w");
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}
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if (file_ctx->fp == NULL) {
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SCLogError(SC_ERR_FOPEN, "failed to open %s: %s", log_path,
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strerror(errno));
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return -1;
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}
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return 0;
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}
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/** \brief Function to create the time string from the packet timestamp */
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static void CreateTimeString (const struct timeval *ts, char *str, size_t size) {
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time_t time = ts->tv_sec;
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struct tm local_tm;
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struct tm *t = (struct tm *)localtime_r(&time, &local_tm);
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snprintf(str, size, "%02d/%02d/%02d-%02d:%02d:%02d.%06u",
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t->tm_mon + 1, t->tm_mday, t->tm_year + 1900, t->tm_hour,
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t->tm_min, t->tm_sec, (uint32_t) ts->tv_usec);
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}
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/**
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* \brief Log the dropped packets in netfilter format when engine is running
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* in inline mode
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*
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* \param tv Pointer the current thread variables
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* \param p Pointer the packet which is being logged
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* \param data Pointer to the droplog struct
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* \param pq Pointer the packet queue
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* \param postpq Pointer the packet queue where this packet will be sent
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*
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* \return return TM_EODE_OK on success
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*/
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TmEcode LogDropLogNetFilter (ThreadVars *tv, Packet *p, void *data, PacketQueue *pq,
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PacketQueue *postpq)
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{
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LogDropLogThread *dlt = (LogDropLogThread *)data;
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uint16_t proto = 0;
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char timebuf[64];
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if (! (p->action & ACTION_DROP))
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return TM_ECODE_OK;
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CreateTimeString(&p->ts, timebuf, sizeof(timebuf));
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SCMutexLock(&dlt->file_ctx->fp_mutex);
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char srcip[46] = "";
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char dstip[46] = "";
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if (PKT_IS_IPV4(p)) {
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inet_ntop(AF_INET, (const void *)GET_IPV4_SRC_ADDR_PTR(p), srcip, 16);
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inet_ntop(AF_INET, (const void *)GET_IPV4_DST_ADDR_PTR(p), dstip, 16);
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fprintf(dlt->file_ctx->fp, "%s: IN= OUT= SRC=%s DST=%s LEN=%"PRIu16" "
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"TOS=0x%02"PRIu8" TTL=%"PRIu8" ID=%"PRIu16"", timebuf,
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srcip, dstip, IPV4_GET_IPLEN(p), IPV4_GET_IPTOS(p),
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IPV4_GET_IPTTL(p), IPV4_GET_IPID(p));
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proto = IPV4_GET_IPPROTO(p);
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} else if (PKT_IS_IPV6(p)) {
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inet_ntop(AF_INET6, (const void *)GET_IPV6_SRC_ADDR(p), srcip, sizeof(srcip));
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inet_ntop(AF_INET6, (const void *)GET_IPV6_DST_ADDR(p), dstip, sizeof(dstip));
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fprintf(dlt->file_ctx->fp, "%s: IN= OUT= SRC=%s DST=%s LEN=%"PRIu16""
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" TC=%"PRIu32" HOPLIMIT=%"PRIu8" FLOWLBL=%"PRIu32"", timebuf,
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srcip, dstip, IPV6_GET_PLEN(p), IPV6_GET_CLASS(p),
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IPV6_GET_HLIM(p), IPV6_GET_FLOW(p));
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proto = IPV6_GET_L4PROTO(p);
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}
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if (SCProtoNameValid(proto) == TRUE) {
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fprintf(dlt->file_ctx->fp, " PROTO=%s",known_proto[proto]);
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} else {
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fprintf(dlt->file_ctx->fp, " PROTO=%03"PRIu16"",proto);
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}
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switch (proto) {
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case IPPROTO_TCP:
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fprintf(dlt->file_ctx->fp, " SPT=%"PRIu16" DPT=%"PRIu16" "
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"SEQ=%"PRIu32" ACK=%"PRIu32" WINDOW=%"PRIu32"",
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GET_TCP_SRC_PORT(p), GET_TCP_DST_PORT(p), TCP_GET_SEQ(p),
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TCP_GET_ACK(p), TCP_GET_WINDOW(p));
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fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_SYN(p) ? " SYN" : "");
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fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_ACK(p) ? " ACK" : "");
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fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_PUSH(p) ? " PSH" : "");
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fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_RST(p) ? " RST" : "");
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fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_URG(p) ? " URG" : "");
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fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_FIN(p) ? " FIN" : "");
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fprintf(dlt->file_ctx->fp, " RES=0x%02"PRIu8" URGP=%"PRIu16"",
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TCP_GET_RAW_X2(p->tcph), TCP_GET_URG_POINTER(p));
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break;
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case IPPROTO_UDP:
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fprintf(dlt->file_ctx->fp, " SPT=%"PRIu16" DPT=%"PRIu16""
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" LEN=%"PRIu16"", UDP_GET_SRC_PORT(p),
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UDP_GET_DST_PORT(p), UDP_GET_LEN(p));
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break;
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case IPPROTO_ICMP:
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if (PKT_IS_ICMPV4(p)) {
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fprintf(dlt->file_ctx->fp, " TYPE=%"PRIu16" CODE=%"PRIu16""
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" ID=%"PRIu16" SEQ=%"PRIu16"", ICMPV4_GET_TYPE(p),
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ICMPV4_GET_CODE(p), ICMPV4_GET_ID(p), ICMPV4_GET_SEQ(p));
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} else if(PKT_IS_ICMPV6(p)) {
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fprintf(dlt->file_ctx->fp, " TYPE=%"PRIu16" CODE=%"PRIu16""
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" ID=%"PRIu16" SEQ=%"PRIu16"", ICMPV6_GET_TYPE(p),
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ICMPV6_GET_CODE(p), ICMPV6_GET_ID(p), ICMPV6_GET_SEQ(p));
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}
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break;
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default:
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fprintf(dlt->file_ctx->fp," Unknown protocol");
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}
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fprintf(dlt->file_ctx->fp,"\n");
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fflush(dlt->file_ctx->fp);
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dlt->drop_cnt++;
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SCMutexUnlock(&dlt->file_ctx->fp_mutex);
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return TM_ECODE_OK;
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}
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/**
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* \brief Log the dropped packets when engine is running in inline mode
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*
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* \param tv Pointer the current thread variables
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* \param p Pointer the packet which is being logged
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* \param data Pointer to the droplog struct
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* \param pq Pointer the packet queue
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* \param postpq Pointer the packet queue where this packet will be sent
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*
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* \return return TM_EODE_OK on success
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*/
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TmEcode LogDropLog (ThreadVars *tv, Packet *p, void *data, PacketQueue *pq,
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PacketQueue *postpq)
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{
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/* Check if we are in inline mode or not, if not then no need to log */
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extern uint8_t engine_mode;
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if (! IS_ENGINE_MODE_IPS(engine_mode)) {
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printf("engine is not running in inlin mode, so returning\n");
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return TM_ECODE_OK;
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}
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if ( (p->flow != NULL) && (p->flow->flags & FLOW_ACTION_DROP) ) {
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if (PKT_IS_TOSERVER(p) && ! (p->flow->flags & FLOW_TOSERVER_DROP_LOGGED))
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{
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p->flow->flags |= FLOW_TOSERVER_DROP_LOGGED;
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return LogDropLogNetFilter(tv, p, data, pq, postpq);
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} else if (! (p->flow->flags & FLOW_TOCLIENT_DROP_LOGGED)) {
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p->flow->flags |= FLOW_TOCLIENT_DROP_LOGGED;
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return LogDropLogNetFilter(tv, p, data, pq, postpq);
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}
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} else {
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return LogDropLogNetFilter(tv, p, data, pq, postpq);
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}
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return TM_ECODE_OK;
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}
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void LogDropLogExitPrintStats(ThreadVars *tv, void *data) {
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LogDropLogThread *dlt = (LogDropLogThread *)data;
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if (dlt == NULL) {
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return;
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}
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SCLogInfo("(%s) Dropped Packets %" PRIu64 "", tv->name, dlt->drop_cnt);
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}
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/***************************** Unittests ****************************/
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#ifdef UNITTESTS
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/** \brief test if the action is drop then packet should be logged */
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int LogDropLogTest01()
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{
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int result = 0;
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extern uint8_t engine_mode;
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SET_ENGINE_MODE_IPS(engine_mode);
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uint8_t *buf = (uint8_t *) "GET /one/ HTTP/1.1\r\n"
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"Host: one.example.org\r\n";
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uint16_t buflen = strlen((char *)buf);
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Packet *p = NULL;
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ThreadVars th_v;
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DetectEngineThreadCtx *det_ctx;
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LogDropLogThread dlt;
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LogFileCtx *logfile_ctx = LogFileNewCtx();
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if (logfile_ctx == NULL) {
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printf("Could not create new LogFileCtx\n");
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return 0;
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}
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memset (&dlt, 0, sizeof(LogDropLogThread));
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dlt.file_ctx = logfile_ctx;
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dlt.file_ctx->fp = stdout;
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memset(&th_v, 0, sizeof(th_v));
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p = UTHBuildPacket(buf, buflen, IPPROTO_TCP);
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DetectEngineCtx *de_ctx = DetectEngineCtxInit();
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if (de_ctx == NULL) {
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return result;
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}
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de_ctx->flags |= DE_QUIET;
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SCClassConfGenerateValidDummyClassConfigFD01();
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||||
SCClassConfLoadClassficationConfigFile(de_ctx);
|
||||
SCClassConfDeleteDummyClassificationConfigFD();
|
||||
|
||||
de_ctx->sig_list = SigInit(de_ctx, "drop tcp any any -> any any "
|
||||
"(msg:\"LogDropLog test\"; content:GET; Classtype:unknown; sid:1;)");
|
||||
|
||||
result = (de_ctx->sig_list != NULL);
|
||||
|
||||
SigGroupBuild(de_ctx);
|
||||
DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
|
||||
|
||||
SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
|
||||
if (p->alerts.cnt == 1 && (p->action & ACTION_DROP))
|
||||
result = (strcmp(p->alerts.alerts[0].class_msg, "Unknown are we") == 0);
|
||||
else
|
||||
result = 0;
|
||||
|
||||
LogDropLog(NULL, p, &dlt, NULL, NULL);
|
||||
|
||||
if (dlt.drop_cnt == 0) {
|
||||
printf("Packet should be logged but its not\n");
|
||||
result = 0;
|
||||
}
|
||||
|
||||
SigGroupCleanup(de_ctx);
|
||||
SigCleanSignatures(de_ctx);
|
||||
DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
|
||||
DetectEngineCtxFree(de_ctx);
|
||||
|
||||
UTHFreePackets(&p, 1);
|
||||
return result;
|
||||
}
|
||||
|
||||
/** \brief test if the action is alert then packet shouldn't be logged */
|
||||
int LogDropLogTest02()
|
||||
{
|
||||
int result = 0;
|
||||
extern uint8_t engine_mode;
|
||||
SET_ENGINE_MODE_IPS(engine_mode);
|
||||
|
||||
uint8_t *buf = (uint8_t *) "GET";
|
||||
|
||||
uint16_t buflen = strlen((char *)buf);
|
||||
Packet *p = NULL;
|
||||
ThreadVars th_v;
|
||||
DetectEngineThreadCtx *det_ctx;
|
||||
LogDropLogThread dlt;
|
||||
LogFileCtx *logfile_ctx = LogFileNewCtx();
|
||||
if (logfile_ctx == NULL) {
|
||||
printf("Could not create new LogFileCtx\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
memset (&dlt, 0, sizeof(LogDropLogThread));
|
||||
dlt.file_ctx = logfile_ctx;
|
||||
dlt.file_ctx->fp = stdout;
|
||||
|
||||
memset(&th_v, 0, sizeof(th_v));
|
||||
p = UTHBuildPacket(buf, buflen, IPPROTO_UDP);
|
||||
|
||||
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
|
||||
if (de_ctx == NULL) {
|
||||
return result;
|
||||
}
|
||||
|
||||
de_ctx->flags |= DE_QUIET;
|
||||
|
||||
SCClassConfGenerateValidDummyClassConfigFD01();
|
||||
SCClassConfLoadClassficationConfigFile(de_ctx);
|
||||
SCClassConfDeleteDummyClassificationConfigFD();
|
||||
|
||||
de_ctx->sig_list = SigInit(de_ctx, "alert udp any any -> any any "
|
||||
"(msg:\"LogDropLog test\"; content:GET; Classtype:unknown; sid:1;)");
|
||||
|
||||
result = (de_ctx->sig_list != NULL);
|
||||
|
||||
SigGroupBuild(de_ctx);
|
||||
DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
|
||||
|
||||
SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
|
||||
if (p->alerts.cnt == 1 && p->alerts.alerts[0].action != ACTION_DROP)
|
||||
result = (strcmp(p->alerts.alerts[0].class_msg, "Unknown are we") == 0);
|
||||
else
|
||||
result = 0;
|
||||
|
||||
LogDropLog(NULL, p, &dlt, NULL, NULL);
|
||||
|
||||
if (dlt.drop_cnt != 0) {
|
||||
printf("Packet shouldn't be logged but it is\n");
|
||||
result = 0;
|
||||
}
|
||||
|
||||
SigGroupCleanup(de_ctx);
|
||||
SigCleanSignatures(de_ctx);
|
||||
DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
|
||||
DetectEngineCtxFree(de_ctx);
|
||||
|
||||
UTHFreePackets(&p, 1);
|
||||
return result;
|
||||
}
|
||||
#endif
|
||||
|
||||
/**
|
||||
* \brief This function registers unit tests for AlertFastLog API.
|
||||
*/
|
||||
void LogDropLogRegisterTests(void)
|
||||
{
|
||||
|
||||
#ifdef UNITTESTS
|
||||
UtRegisterTest("LogDropLogTest01", LogDropLogTest01, 1);
|
||||
UtRegisterTest("LogDropLogTest02", LogDropLogTest02, 1);
|
||||
#endif /* UNITTESTS */
|
||||
|
||||
}
|
||||
@ -0,0 +1,31 @@
|
||||
/* Copyright (C) 2007-2011 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 Gurvinder Singh <gurvindersinghdahiya@gmail.com>
|
||||
*
|
||||
*/
|
||||
|
||||
|
||||
#ifndef ALERT_DROPLOG_H
|
||||
#define ALERT_DROPLOG_H
|
||||
|
||||
void TmModuleLogDropLogRegister(void);
|
||||
|
||||
#endif /* ALERT_DROPLOG_H */
|
||||
Loading…
Reference in New Issue