mirror of
https://github.com/BlackLight/Snort_AIPreproc.git
synced 2024-11-24 04:35:11 +01:00
Supporting alert history serialization
This commit is contained in:
BlackLight
parent
93e0ba6511
commit
684f387a6e
7 changed files with 421 additions and 36 deletions
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@ -16,6 +16,7 @@ include/sf_dynamic_preproc_lib.c \
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include/sfPolicyUserData.c
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libsf_ai_preproc_la_SOURCES = \
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alert_history.c \
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alert_parser.c \
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cluster.c \
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correlation.c \
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@ -75,7 +75,8 @@ am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(corr_rulesdir)" \
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"$(DESTDIR)$(sharedir)"
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LTLIBRARIES = $(lib_LTLIBRARIES)
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libsf_ai_preproc_la_LIBADD =
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am_libsf_ai_preproc_la_OBJECTS = libsf_ai_preproc_la-alert_parser.lo \
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am_libsf_ai_preproc_la_OBJECTS = libsf_ai_preproc_la-alert_history.lo \
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libsf_ai_preproc_la-alert_parser.lo \
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libsf_ai_preproc_la-cluster.lo \
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libsf_ai_preproc_la-correlation.lo libsf_ai_preproc_la-db.lo \
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libsf_ai_preproc_la-mysql.lo libsf_ai_preproc_la-postgresql.lo \
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@ -250,6 +251,7 @@ include/sf_dynamic_preproc_lib.c \
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include/sfPolicyUserData.c
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libsf_ai_preproc_la_SOURCES = \
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alert_history.c \
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alert_parser.c \
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cluster.c \
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correlation.c \
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@ -371,6 +373,9 @@ distclean-compile:
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.c.lo:
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$(LTCOMPILE) -c -o $@ $<
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libsf_ai_preproc_la-alert_history.lo: alert_history.c
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$(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libsf_ai_preproc_la_CFLAGS) $(CFLAGS) -c -o libsf_ai_preproc_la-alert_history.lo `test -f 'alert_history.c' || echo '$(srcdir)/'`alert_history.c
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libsf_ai_preproc_la-alert_parser.lo: alert_parser.c
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$(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libsf_ai_preproc_la_CFLAGS) $(CFLAGS) -c -o libsf_ai_preproc_la-alert_parser.lo `test -f 'alert_parser.c' || echo '$(srcdir)/'`alert_parser.c
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1
TODO
1
TODO
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@ -2,6 +2,7 @@
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AVERAGE/HIGH PRIORITY:
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======================
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- Add alerts' history serialization to db.c as well
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- Testing more scenarios, making more hyperalert models
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- Bayesian learning among alerts in alert log
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- libgc support
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220
alert_history.c
220
alert_history.c
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@ -19,3 +19,223 @@
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#include "spp_ai.h"
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#include <sys/stat.h>
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typedef struct {
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int gid;
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int sid;
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int rev;
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} AI_alert_event_key;
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typedef struct _AI_alert_event {
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AI_alert_event_key key;
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unsigned int count;
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time_t timestamp;
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struct _AI_alert_event *next;
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UT_hash_handle hh;
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} AI_alert_event;
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PRIVATE AI_alert_event *alerts_hash = NULL;
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/**
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* FUNCTION: AI_alerts_hash_free
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* \brief Free a hash table of alert events
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* \param events Hash table to be freed
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*/
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void
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AI_alerts_hash_free ( AI_alert_event **events )
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{
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AI_alert_event *hash_iterator = NULL,
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*list_iterator = NULL,
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*tmp = NULL;
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while ( *events )
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{
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hash_iterator = *events;
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HASH_DEL ( *events, hash_iterator );
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list_iterator = hash_iterator;
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while ( list_iterator )
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{
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tmp = list_iterator->next;
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free ( list_iterator );
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list_iterator = tmp;
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}
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free ( hash_iterator );
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}
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*events = NULL;
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} /* ----- end of function AI_alerts_hash_free ----- */
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/**
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* \brief Deserialize a alerts' hash table from the binary history file
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* \param conf Configuration of the module
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* \return A void* pointer (to be casted to AI_alert_event*) to the stored hash table
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*/
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void*
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AI_deserialize_alerts ( AI_config *conf )
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{
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FILE *fp = NULL;
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struct stat st;
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unsigned int i, j,
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lists_count = 0,
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items_count = 0;
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AI_alert_event *event_iterator = NULL,
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*event_prev = NULL,
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*event_list = NULL;
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AI_alert_event_key key;
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if ( stat ( conf->alert_history_file, &st ) < 0 )
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return NULL;
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if ( ! S_ISREG ( st.st_mode ))
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_dpd.fatalMsg ( "AIPreproc: '%s' is not a regular file\n", conf->alert_history_file );
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if ( !( fp = fopen ( conf->alert_history_file, "r" )))
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_dpd.fatalMsg ( "AIPreproc: Unable to read from the file '%s'\n", conf->alert_history_file );
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AI_alerts_hash_free ( &alerts_hash );
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if ( fread ( &lists_count, sizeof ( unsigned int ), 1, fp ) <= 0 )
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_dpd.fatalMsg ( "AIPreproc: Malformed history file '%s'\n", conf->alert_history_file );
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/* Fill the hash table reading from the file */
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for ( i=0; i < lists_count; i++ )
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{
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event_iterator = NULL;
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event_prev = NULL;
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if ( fread ( &items_count, sizeof ( unsigned int ), 1, fp ) <= 0 )
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_dpd.fatalMsg ( "AIPreproc: Malformed history file '%s'\n", conf->alert_history_file );
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for ( j=0; j < items_count; j++ )
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{
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if ( j == 0 )
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{
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if ( !( event_list = ( AI_alert_event* ) malloc ( sizeof ( AI_alert_event ))))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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memset ( event_list, 0, sizeof ( AI_alert_event ));
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event_iterator = event_list;
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} else {
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if ( !( event_iterator = ( AI_alert_event* ) malloc ( sizeof ( AI_alert_event ))))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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memset ( event_iterator, 0, sizeof ( AI_alert_event ));
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}
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event_iterator->count = items_count;
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if ( fread ( &( event_iterator->key ), sizeof ( event_iterator->key ), 1, fp ) <= 0 )
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_dpd.fatalMsg ( "AIPreproc: Malformed history file '%s'\n", conf->alert_history_file );
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if ( fread ( &( event_iterator->timestamp ), sizeof ( event_iterator->timestamp ), 1, fp ) <= 0 )
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_dpd.fatalMsg ( "AIPreproc: Malformed history file '%s'\n", conf->alert_history_file );
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if ( event_prev )
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{
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event_prev->next = event_iterator;
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}
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event_prev = event_iterator;
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}
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key = event_iterator->key;
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HASH_ADD ( hh, alerts_hash, key, sizeof ( key ), event_list );
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}
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fclose ( fp );
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return (void*) alerts_hash;
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} /* ----- end of function AI_deserialize_alerts ----- */
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/**
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* \brief Serialize a buffer of alerts to the binary history file
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* \param alerts_pool Buffer of alerts to be serialized
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* \param alerts_pool_count Number of alerts in the buffer
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* \param conf Configuration of the module
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*/
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void
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AI_serialize_alerts ( AI_snort_alert **alerts_pool, unsigned int alerts_pool_count, AI_config *conf )
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{
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unsigned int i,
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hash_count = 0,
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list_count = 0;
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FILE *fp = NULL;
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AI_alert_event_key key;
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AI_alert_event *found = NULL,
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*event = NULL,
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*event_next = NULL,
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*event_iterator = NULL;
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if ( !alerts_hash )
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{
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AI_deserialize_alerts ( conf );
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}
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for ( i=0; i < alerts_pool_count; i++ )
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{
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if ( !( event = ( AI_alert_event* ) malloc ( sizeof ( AI_alert_event ))))
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_dpd.fatalMsg ( "AIPreproc: Fatal dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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memset ( event, 0, sizeof ( AI_alert_event ));
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key.gid = alerts_pool[i]->gid;
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key.sid = alerts_pool[i]->sid;
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key.rev = alerts_pool[i]->rev;
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event->key = key;
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event->timestamp = alerts_pool[i]->timestamp;
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HASH_FIND ( hh, alerts_hash, &key, sizeof ( key ), found );
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if ( !found )
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{
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event->count = 1;
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event->next = NULL;
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HASH_ADD ( hh, alerts_hash, key, sizeof ( key ), event );
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} else {
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found->count++;
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event_next = NULL;
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for ( event_iterator = found; event_iterator->next; event_iterator = event_iterator->next )
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{
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/* Insert the new event in cronological order */
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if ( event_iterator->next->timestamp > event->timestamp )
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{
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event_next = event_iterator->next;
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break;
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}
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}
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if ( event_iterator )
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event_iterator->next = event;
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event->next = event_next;
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}
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}
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hash_count = HASH_COUNT ( alerts_hash );
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if ( !( fp = fopen ( conf->alert_history_file, "w" )))
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_dpd.fatalMsg ( "AIPreproc: Unable to write on '%s'\n", conf->alert_history_file );
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fwrite ( &hash_count, sizeof ( hash_count ), 1, fp );
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for ( event = alerts_hash; event; event = ( AI_alert_event* ) event->hh.next )
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{
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list_count = event->count;
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fwrite ( &list_count, sizeof ( list_count ), 1, fp );
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for ( event_iterator = event; event_iterator; event_iterator = event_iterator->next )
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{
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fwrite ( &(event_iterator->key), sizeof ( event_iterator->key ), 1, fp );
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fwrite ( &(event_iterator->timestamp), sizeof ( event_iterator->timestamp ), 1, fp );
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}
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}
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fclose ( fp );
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} /* ----- end of function AI_serialize_alerts ----- */
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122
alert_parser.c
122
alert_parser.c
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@ -30,12 +30,90 @@
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PRIVATE AI_snort_alert *alerts = NULL;
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PRIVATE AI_snort_alert **alerts_pool = NULL;
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PRIVATE AI_config *conf = NULL;
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PRIVATE FILE *alert_fp = NULL;
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PRIVATE pthread_mutex_t mutex;
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PRIVATE unsigned int alerts_pool_count = 0;
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PRIVATE pthread_mutex_t alert_mutex;
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PRIVATE pthread_mutex_t alerts_pool_mutex;
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/** \defgroup alert_parser Parse the alert log into binary structures
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* @{ */
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/**
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* \brief Serialize the pool of alerts in a separated thread
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* \param arg void* pointer to the alert to be added to the pool, if any
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*/
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PRIVATE void*
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_AI_serializer_thread ( void *arg )
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{
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unsigned int i = 0;
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AI_snort_alert *alert = NULL;
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if ( arg )
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{
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alert = ( AI_snort_alert* ) arg;
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pthread_mutex_lock ( &alerts_pool_mutex );
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alerts_pool [ alerts_pool_count++ ] = alert;
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pthread_mutex_unlock ( &alerts_pool_mutex );
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}
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if ( !arg || ( arg && alerts_pool_count >= conf->alert_bufsize ))
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{
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pthread_mutex_lock ( &alerts_pool_mutex );
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_dpd.logMsg ( "**** LOCKED ****\n" );
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AI_serialize_alerts ( alerts_pool, alerts_pool_count, conf );
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for ( i=0; i < alerts_pool_count; i++ )
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{
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alerts_pool[i] = NULL;
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}
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alerts_pool_count = 0;
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pthread_mutex_unlock ( &alerts_pool_mutex );
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_dpd.logMsg ( "**** UNLOCKED ****\n\n" );
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}
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pthread_exit ((void*) 0);
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return (void*) 0;
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} /* ----- end of function _AI_serializer_thread ----- */
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/**
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* \brief Thread for managing the buffer of alerts and serialize them at constant intervals
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*/
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PRIVATE void*
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_AI_alerts_pool_thread ( void *arg )
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{
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pthread_t serializer_thread;
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while ( 1 )
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{
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if ( !conf )
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{
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pthread_exit ((void*) 0);
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return (void*) 0;
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}
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sleep ( conf->alertSerializationInterval );
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if ( !alerts_pool || alerts_pool_count == 0 )
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continue;
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if ( pthread_create ( &serializer_thread, NULL, _AI_serializer_thread, NULL ) != 0 )
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_dpd.fatalMsg ( "Failed to create the alerts' serializer thread\n" );
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}
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pthread_exit ((void*) 0);
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return (void*) 0;
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} /* ----- end of function _AI_alerts_pool_thread ----- */
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/**
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* \brief Thread for parsing Snort's alert file
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* \param arg void* pointer to module's configuration
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@ -54,14 +132,14 @@ AI_file_alertparser_thread ( void* arg )
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};
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int i;
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#ifndef __APPLE__
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#ifdef LINUX
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int ifd;
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int wd;
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struct stat st;
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#else
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int fd = -1;
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struct stat stats;
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time_t last_mod_time = (time_t)0;
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time_t last_mod_time = (time_t) 0;
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#endif
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int nmatches = 0;
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char line[8192];
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@ -73,16 +151,34 @@ AI_file_alertparser_thread ( void* arg )
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struct pkt_key key;
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struct pkt_info *info;
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AI_config *conf = ( AI_config* ) arg;
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AI_snort_alert *alert = NULL;
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AI_snort_alert *tmp = NULL;
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BOOL in_alert = false;
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pthread_t alerts_pool_thread;
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pthread_t serializer_thread;
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pthread_mutex_init ( &mutex, NULL );
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conf = ( AI_config* ) arg;
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/* Initialize the mutex lock, so nobody can read the alerts while we write there */
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pthread_mutex_init ( &alert_mutex, NULL );
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/* Initialize the mutex on the alerts' pool, so that an only thread per time can write there */
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pthread_mutex_init ( &alerts_pool_mutex, NULL );
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/* Initialize the pool of alerts to be passed to the serialization thread */
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if ( !( alerts_pool = ( AI_snort_alert** ) malloc ( conf->alert_bufsize * sizeof ( AI_snort_alert* ))))
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_dpd.fatalMsg ( "Dynamic memory allocation error at %s:%d\n", __FILE__, __LINE__ );
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for ( i=0; i < conf->alert_bufsize; i++ )
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alerts_pool[i] = NULL;
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/* Initialize the thread for managing the serialization of alerts' pool */
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if ( pthread_create ( &alerts_pool_thread, NULL, _AI_alerts_pool_thread, NULL ) != 0 )
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_dpd.fatalMsg ( "Failed to create the alerts' pool management thread\n" );
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while ( 1 )
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{
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#ifndef MACOS
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#ifdef LINUX
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if (( ifd = inotify_init() ) < 0 )
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{
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_dpd.fatalMsg ( "Could not initialize an inotify object on the alert log file" );
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@ -197,7 +293,8 @@ AI_file_alertparser_thread ( void* arg )
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tmp->next = alert;
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}
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/* TODO Do something!! */
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if ( pthread_create ( &serializer_thread, NULL, _AI_serializer_thread, alert ) != 0 )
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_dpd.fatalMsg ( "Failed to create the alerts' serializer thread\n" );
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in_alert = false;
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alert = NULL;
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@ -208,7 +305,7 @@ AI_file_alertparser_thread ( void* arg )
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if ( !in_alert )
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{
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pthread_mutex_lock ( &mutex );
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pthread_mutex_lock ( &alert_mutex );
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if ( preg_match ( "^\\[\\*\\*\\]\\s*\\[([0-9]+):([0-9]+):([0-9]+)\\]\\s*(.*)\\s*\\[\\*\\*\\]$", line, &matches, &nmatches ) > 0 )
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{
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@ -356,11 +453,12 @@ AI_file_alertparser_thread ( void* arg )
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}
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}
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pthread_mutex_unlock ( &mutex );
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pthread_mutex_unlock ( &alert_mutex );
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/* AI_alert_serialize ( alert, conf ); */
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}
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pthread_mutex_destroy ( &mutex );
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free ( alerts_pool );
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pthread_mutex_destroy ( &alert_mutex );
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pthread_exit ((void*) 0 );
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return (void*) 0;
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} /* ----- end of function AI_file_alertparser_thread ----- */
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@ -406,9 +504,9 @@ AI_get_alerts ()
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{
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AI_snort_alert *alerts_copy;
|
||||
|
||||
pthread_mutex_lock ( &mutex );
|
||||
pthread_mutex_lock ( &alert_mutex );
|
||||
alerts_copy = _AI_copy_alerts ( alerts );
|
||||
pthread_mutex_unlock ( &mutex );
|
||||
pthread_mutex_unlock ( &alert_mutex );
|
||||
|
||||
return alerts_copy;
|
||||
} /* ----- end of function AI_get_alerts ----- */
|
||||
|
|
|
|||
50
spp_ai.c
50
spp_ai.c
|
|
@ -85,7 +85,7 @@ static void AI_init(char *args)
|
|||
{
|
||||
ex_config = sfPolicyConfigCreate();
|
||||
if (ex_config == NULL)
|
||||
_dpd.fatalMsg("Could not allocate configuration struct.\n");
|
||||
_dpd.fatalMsg ("Could not allocate configuration struct.\n");
|
||||
}
|
||||
|
||||
config = AI_parse(args);
|
||||
|
|
@ -162,6 +162,8 @@ static AI_config * AI_parse(char *args)
|
|||
stream_expire_interval = 0,
|
||||
alertfile_len = 0,
|
||||
alert_history_file_len = 0,
|
||||
alert_serialization_interval = 0,
|
||||
alert_bufsize = 0,
|
||||
clusterfile_len = 0,
|
||||
corr_rules_dir_len = 0,
|
||||
corr_alerts_dir_len = 0,
|
||||
|
|
@ -285,6 +287,42 @@ static AI_config * AI_parse(char *args)
|
|||
_dpd.logMsg(" Correlation graph thread interval: %d\n", config->correlationGraphInterval);
|
||||
}
|
||||
|
||||
/* Parsing the alert_serialization_interval option */
|
||||
if (( arg = (char*) strcasestr( args, "alert_serialization_interval" ) ))
|
||||
{
|
||||
for ( arg += strlen("alert_serialization_interval");
|
||||
*arg && (*arg < '0' || *arg > '9');
|
||||
arg++ );
|
||||
|
||||
if ( !(*arg) )
|
||||
{
|
||||
_dpd.fatalMsg("AIPreproc: alert_serialization_interval option used but "
|
||||
"no value specified\n");
|
||||
}
|
||||
|
||||
alert_serialization_interval = strtoul(arg, NULL, 10);
|
||||
config->alertSerializationInterval = alert_serialization_interval;
|
||||
_dpd.logMsg(" Alert serialization thread interval: %d\n", config->correlationGraphInterval);
|
||||
}
|
||||
|
||||
/* Parsing the alert_bufsize option */
|
||||
if (( arg = (char*) strcasestr( args, "alert_bufsize" ) ))
|
||||
{
|
||||
for ( arg += strlen("alert_bufsize");
|
||||
*arg && (*arg < '0' || *arg > '9');
|
||||
arg++ );
|
||||
|
||||
if ( !(*arg) )
|
||||
{
|
||||
_dpd.fatalMsg("AIPreproc: alert_bufsize option used but "
|
||||
"no value specified\n");
|
||||
}
|
||||
|
||||
alert_bufsize = strtoul(arg, NULL, 10);
|
||||
config->alert_bufsize= alert_bufsize;
|
||||
_dpd.logMsg(" Alert buffer size: %d\n", config->alert_bufsize );
|
||||
}
|
||||
|
||||
/* Parsing the correlation_threshold_coefficient option */
|
||||
if (( arg = (char*) strcasestr( args, "correlation_threshold_coefficient" ) ))
|
||||
{
|
||||
|
|
@ -849,6 +887,16 @@ static AI_config * AI_parse(char *args)
|
|||
strncpy ( config->corr_alerts_dir, DEFAULT_CORR_ALERTS_DIR, sizeof ( DEFAULT_CORR_ALERTS_DIR ));
|
||||
}
|
||||
|
||||
if ( ! alert_serialization_interval )
|
||||
{
|
||||
config->alertSerializationInterval = DEFAULT_ALERT_SERIALIZATION_INTERVAL;
|
||||
}
|
||||
|
||||
if ( ! alert_bufsize )
|
||||
{
|
||||
config->alert_bufsize = DEFAULT_ALERT_BUFSIZE;
|
||||
}
|
||||
|
||||
_dpd.logMsg ( "Saving correlated alerts information in %s\n", config->corr_alerts_dir );
|
||||
|
||||
if ( has_database_log )
|
||||
|
|
|
|||
22
spp_ai.h
22
spp_ai.h
|
|
@ -63,6 +63,12 @@
|
|||
/** Default correlation threshold coefficient for correlating two hyperalerts */
|
||||
#define DEFAULT_CORR_THRESHOLD 0.5
|
||||
|
||||
/** Default size of the alerts' buffer to be periodically sent to the serialization thread */
|
||||
#define DEFAULT_ALERT_BUFSIZE 30
|
||||
|
||||
/** Default timeout in seconds between a serialization of the alerts' buffer and the next one */
|
||||
#define DEFAULT_ALERT_SERIALIZATION_INTERVAL 3600
|
||||
|
||||
/****************************/
|
||||
/* Database support */
|
||||
#ifdef HAVE_LIBMYSQLCLIENT
|
||||
|
|
@ -134,6 +140,12 @@ typedef struct
|
|||
/** Interval in seconds for running the thread for building alert correlation graphs */
|
||||
unsigned long correlationGraphInterval;
|
||||
|
||||
/** Interval in seconds between a serialization of the alerts' buffer and the next one */
|
||||
unsigned long alertSerializationInterval;
|
||||
|
||||
/** Size of the alerts' buffer to be periodically sent to the serialization thread */
|
||||
unsigned long alert_bufsize;
|
||||
|
||||
/** Correlation threshold coefficient for correlating two hyperalerts. Two hyperalerts
|
||||
* are 'correlated' to each other in a multi-step attack graph if and only if their
|
||||
* correlation value is >= m + ks, where m is the average correlation coefficient,
|
||||
|
|
@ -289,8 +301,8 @@ typedef struct _AI_snort_alert {
|
|||
/*****************************************************************/
|
||||
|
||||
int preg_match ( const char*, char*, char***, int* );
|
||||
char* str_replace ( char *str, char *orig, char *rep );
|
||||
char* str_replace_all ( char *str, char *orig, char *rep );
|
||||
char* str_replace ( char*, char*, char *);
|
||||
char* str_replace_all ( char*, char*, char* );
|
||||
|
||||
void* AI_hashcleanup_thread ( void* );
|
||||
void* AI_file_alertparser_thread ( void* );
|
||||
|
|
@ -298,7 +310,7 @@ void* AI_alert_correlation_thread ( void* );
|
|||
|
||||
#ifdef HAVE_DB
|
||||
AI_snort_alert* AI_db_get_alerts ( void );
|
||||
void AI_db_free_alerts ( AI_snort_alert *node );
|
||||
void AI_db_free_alerts ( AI_snort_alert* );
|
||||
void* AI_db_alertparser_thread ( void* );
|
||||
#endif
|
||||
|
||||
|
|
@ -311,8 +323,8 @@ struct pkt_info* AI_get_stream_by_key ( struct pkt_key );
|
|||
AI_snort_alert* AI_get_alerts ( void );
|
||||
AI_snort_alert* AI_get_clustered_alerts ( void );
|
||||
|
||||
void AI_serialize_alert ( AI_snort_alert*, AI_config* );
|
||||
void AI_deserialize_alert ( AI_snort_alert*, AI_config* );
|
||||
void AI_serialize_alerts ( AI_snort_alert**, unsigned int, AI_config* );
|
||||
void* AI_deserialize_alerts ( AI_config* );
|
||||
|
||||
/** Function pointer to the function used for getting the alert list (from log file, db, ...) */
|
||||
extern AI_snort_alert* (*get_alerts)(void);
|
||||
|
|
|
|||
Loading…
Reference in a new issue