mirror of
https://github.com/BlackLight/Snort_AIPreproc.git
synced 2024-11-13 12:17:15 +01:00
Plugin support, README updated
This commit is contained in:
parent
820ca2151c
commit
7772c9b089
17 changed files with 437 additions and 40 deletions
|
@ -26,6 +26,7 @@ cluster.c \
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correlation.c \
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db.c \
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fsom/fsom.c \
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modules.c \
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mysql.c \
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neural.c \
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outdb.c \
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@ -57,6 +58,8 @@ fi
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mkdir -p "${SHARE_PREFIX}/htdocs"
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mkdir -p "${SHARE_PREFIX}/htdocs/js"
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mkdir -p "${SHARE_PREFIX}/schemas"
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mkdir -p "${SHARE_PREFIX}/corr_modules"
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cp -rf "${PWD}/corr_modules/"* "${SHARE_PREFIX}/corr_modules"
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install -m 0644 "${PWD}/htdocs/index.html" "${SHARE_PREFIX}/htdocs"
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install -m 0644 "${PWD}/htdocs/manual_correlations.dtd" "${SHARE_PREFIX}/htdocs"
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install -m 0644 "${PWD}/htdocs/manual_correlations.xml" "${SHARE_PREFIX}/htdocs"
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16
Makefile.in
16
Makefile.in
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@ -84,11 +84,11 @@ am_libsf_ai_preproc_la_OBJECTS = libsf_ai_preproc_la-alert_history.lo \
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libsf_ai_preproc_la-cencode.lo libsf_ai_preproc_la-bayesian.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-fsom.lo libsf_ai_preproc_la-mysql.lo \
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libsf_ai_preproc_la-neural.lo libsf_ai_preproc_la-outdb.lo \
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libsf_ai_preproc_la-postgresql.lo libsf_ai_preproc_la-regex.lo \
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libsf_ai_preproc_la-spp_ai.lo libsf_ai_preproc_la-stream.lo \
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libsf_ai_preproc_la-webserv.lo
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libsf_ai_preproc_la-fsom.lo libsf_ai_preproc_la-modules.lo \
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libsf_ai_preproc_la-mysql.lo libsf_ai_preproc_la-neural.lo \
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libsf_ai_preproc_la-outdb.lo libsf_ai_preproc_la-postgresql.lo \
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libsf_ai_preproc_la-regex.lo libsf_ai_preproc_la-spp_ai.lo \
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libsf_ai_preproc_la-stream.lo libsf_ai_preproc_la-webserv.lo
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nodist_libsf_ai_preproc_la_OBJECTS = \
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libsf_ai_preproc_la-sf_dynamic_preproc_lib.lo \
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libsf_ai_preproc_la-sfPolicyUserData.lo
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@ -268,6 +268,7 @@ cluster.c \
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correlation.c \
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db.c \
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fsom/fsom.c \
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modules.c \
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mysql.c \
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neural.c \
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outdb.c \
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@ -418,6 +419,9 @@ libsf_ai_preproc_la-db.lo: db.c
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libsf_ai_preproc_la-fsom.lo: fsom/fsom.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) $(CFLAGS) -c -o libsf_ai_preproc_la-fsom.lo `test -f 'fsom/fsom.c' || echo '$(srcdir)/'`fsom/fsom.c
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libsf_ai_preproc_la-modules.lo: modules.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) $(CFLAGS) -c -o libsf_ai_preproc_la-modules.lo `test -f 'modules.c' || echo '$(srcdir)/'`modules.c
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libsf_ai_preproc_la-mysql.lo: mysql.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) $(CFLAGS) -c -o libsf_ai_preproc_la-mysql.lo `test -f 'mysql.c' || echo '$(srcdir)/'`mysql.c
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@ -840,6 +844,8 @@ fi
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mkdir -p "${SHARE_PREFIX}/htdocs"
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mkdir -p "${SHARE_PREFIX}/htdocs/js"
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mkdir -p "${SHARE_PREFIX}/schemas"
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mkdir -p "${SHARE_PREFIX}/corr_modules"
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cp -rf "${PWD}/corr_modules/"* "${SHARE_PREFIX}/corr_modules"
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install -m 0644 "${PWD}/htdocs/index.html" "${SHARE_PREFIX}/htdocs"
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install -m 0644 "${PWD}/htdocs/manual_correlations.dtd" "${SHARE_PREFIX}/htdocs"
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install -m 0644 "${PWD}/htdocs/manual_correlations.xml" "${SHARE_PREFIX}/htdocs"
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98
README
98
README
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@ -30,7 +30,8 @@ Table of contents:
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5. Correlation rules
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6. Output database
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7. Web interface
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8. Additional documentation
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8. Additional correlation modules
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9. Additional documentation
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===============================
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@ -161,18 +162,13 @@ following:
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preprocessor ai: \
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alertfile "/your/snort/dir/log/alert" \
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alert_history_file "/your/snort/dir/log/alert_history" \
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alert_serialization_interval 3600 \
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alert_bufsize 30 \
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alert_clustering_interval 300 \
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alert_correlation_weight 5000 \
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alert_history_file "/your/snort/dir/log/alert_history" \
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alert_serialization_interval 3600 \
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bayesian_correlation_interval 1200 \
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bayesian_correlation_cache_validity 600 \
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correlation_graph_interval 300 \
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correlation_rules_dir "/your/snort/dir/etc/corr_rules" \
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correlated_alerts_dir "/your/snort/dir/log/correlated_alerts" \
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correlation_threshold_coefficient 0.5 \
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cluster_max_alert_interval 14400 \
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clusterfile "/your/snort/dir/log/clustered_alerts" \
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cluster ( class="dst_port", name="privileged_ports", range="1-1023" ) \
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cluster ( class="dst_port", name="unprivileged_ports", range="1024-65535" ) \
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cluster ( class="src_addr", name="local_net", range="192.168.1.0/24" ) \
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@ -181,10 +177,21 @@ preprocessor ai: \
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cluster ( class="dst_addr", name="local_net", range="192.168.1.0/24" ) \
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cluster ( class="dst_addr", name="dmz_net", range="155.185.0.0/16" ) \
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cluster ( class="dst_addr", name="vpn_net", range="10.8.0.0/24" ) \
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cluster_max_alert_interval 14400 \
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clusterfile "/your/snort/dir/log/clustered_alerts" \
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corr_modules_dir "/your/snort/dir/share/snort_ai_preproc/corr_modules" \
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correlation_graph_interval 300 \
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correlation_rules_dir "/your/snort/dir/etc/corr_rules" \
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correlated_alerts_dir "/your/snort/dir/log/correlated_alerts" \
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correlation_threshold_coefficient 0.5 \
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database ( type="dbtype", name="snort", user="snortusr", password="snortpass", host="dbhost" ) \
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database_parsing_interval 30 \
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hashtable_cleanup_interval 300 \
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manual_correlations_parsing_interval 120 \
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neural_network_training_interval 43200 \
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neural_train_steps 10 \
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output_database ( type="dbtype", name="snort", user="snortusr", password="snortpass", host="dbhost" ) \
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output_neurons_per_side 20 \
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tcp_stream_expire_interval 300 \
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webserv_banner "Snort AIPreprocessor module" \
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webserv_dir "/prefix/share/htdocs" \
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@ -197,6 +204,15 @@ The options are the following:
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and not to a database (default if not specified: /var/log/snort/alert)
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- alert_correlation_weight: When this number of alert is stored in the "memory"
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of the software (i.e. in the alert history file or in the output database), the
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weight for the heuristical correlation indexes (bayesian network and neural
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network) will be more or less equal to 0.95, on a scale from 0 to 1.
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This parameter expresses how much the heuristical indexes should be weighted and
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it can be considered like a kind of "learning rate" for the alert correlation
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algorithm (default value if not specified: 5000)
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- alert_history_file: The file keeping track of the history, in binary format,
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of all the alerts received by the IDS, so that the module can build some
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statistical correlation inferences over the past
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@ -234,6 +250,14 @@ in the bayesian correlation hash table (i.e. a pair of alerts with the
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before being updated (default: 600 seconds)
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- corr_modules_dir: This software supports a kind of plugins, or "modules over
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the module", that allow the user to specify some extra correlation rules and
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indexes. These modules are .so files placed in this directory (default if not
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specified: PREFIX/share/snort_ai_preproc/corr_modules), dynamically loaded by
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the module. For more information on how to write your own module, see the
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dedicated section in this file.
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- correlation_graph_interval: The interval that should occur from the building
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of the correlation graph between the clustered alerts and the next one (default
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if not specified: 300 seconds)
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@ -301,6 +325,20 @@ the hashtable of TCP streams and the next one (default if not specified: 300
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seconds)
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- manual_correlations_parsing_interval: Interval in seconds between an execution
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of the thread for parsing the alert correlations manually set and the next one
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(default value if not specified: 120 seconds)
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- neural_network_training_interval: Interval in seconds between an execution of
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the thread for training the neural network using the set of recent alerts and
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the next one (default if not specified: 43200 seconds)
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- neural_train_steps: Number of steps to take in each training cycle for the
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neural network (default: 10)
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- output_database: Specify this option if you want to save the outputs from the
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module (correlated alerts, clustered alerts, alerts information and their
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associated packets streams, and so on) to a relational database as
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@ -312,6 +350,13 @@ module, just give the right file to your database, e.g. for MySQL
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$ mysql -uusername -ppassword dbname < schemas/mysql.sql
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- output_neurons_per_side: Number of output neurons per side on the output layer
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of the neural network (that is a rectangular matrix). A higher number allows a
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higher granularity over similar alerts, but a linear increment of this value
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produces a squared increment of the computational complexity for the training
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and evaluation algorithms (default value if not specified: 20)
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- tcp_stream_expire_interval: The interval that should occur for marking a TCP
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stream as "expired", if no more packets are received inside of that and it's not
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"marked" as suspicious (default if not specified: 300 seconds)
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@ -467,8 +512,41 @@ that, all the alerts of those types will be marted as correlated, or
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uncorrelated.
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=================================
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8. Additional correlation modules
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=================================
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It is possible to add extra parameters and indexes for evaluating the
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correlation between two alerts in an extremely simple way. The directory
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specified in the configuration option "corr_modules_dir" contains the extra
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modules (as binary shared libraries -> .so). Each of these modules should
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contain a function whose prototype is
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double AI_corr_index ( AI_snort_alert*, AI_snort_alert* )
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taking two alerts as parameters and returning a correlation value between them,
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and one whose prototype is
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double AI_corr_index_weight ()
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returning a coefficient in [0,1] expressing the weight of that index. An
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example module is contained in the corr_modules directory in the source
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directory, or in PREFIX/share/snort_ai_preproc/corr_modules after installation.
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When you write your own module, just add in the Makefile in the corr_modules
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directory a line like the one already present there for compiling, then type
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`make'. You may need to link your module source file(s) against
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libsf_ai_preproc.la if you want to use some of the functions from the module,
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for example, for reading the alerts stored in the history file, in the
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database, the current correlations, and so on.
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===========================
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8. Additional documentation
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9. Additional documentation
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===========================
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The additional documentation over the code, functions and data structures can
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3
TODO
3
TODO
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@ -2,10 +2,8 @@
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AVERAGE/HIGH PRIORITY:
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======================
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- Supporting extra modules for alert correlation
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- Code profiling
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- Comment all the code!!!
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- Neural network for computing k
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- Testing more scenarios, making more hyperalert models
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=============
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@ -36,4 +34,5 @@ DONE:
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+ Saving packet flows as .pcap
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+ Manual alert correlation from the web interface
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+ Neural network for alert correlation
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+ Supporting extra modules for alert correlation
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@ -497,7 +497,7 @@ __AI_copy_alerts ( AI_snort_alert *node )
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AI_snort_alert*
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AI_get_alerts ()
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{
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AI_snort_alert *alerts_copy;
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AI_snort_alert *alerts_copy = NULL;
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pthread_mutex_lock ( &alert_mutex );
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alerts_copy = __AI_copy_alerts ( alerts );
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@ -751,7 +751,7 @@ __AI_copy_clustered_alerts ( AI_snort_alert *node )
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AI_snort_alert*
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AI_get_clustered_alerts ()
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{
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AI_snort_alert *alerts_copy;
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AI_snort_alert *alerts_copy = NULL;
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pthread_mutex_lock ( &mutex );
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alerts_copy = __AI_copy_clustered_alerts ( alert_log );
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@ -42,6 +42,9 @@
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/* Define to 1 if you have the `connect' function. */
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#undef HAVE_CONNECT
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/* Define to 1 if you have the <dirent.h> header file. */
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#undef HAVE_DIRENT_H
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/* Define to 1 if you have the <dlfcn.h> header file. */
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#undef HAVE_DLFCN_H
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@ -60,6 +63,9 @@
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/* Define to 1 if you have the <inttypes.h> header file. */
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#undef HAVE_INTTYPES_H
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/* Define to 1 if you have the `dl' library (-ldl). */
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#undef HAVE_LIBDL
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/* Define to 1 if you have the `gvc' library (-lgvc). */
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#undef HAVE_LIBGVC
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52
configure
vendored
52
configure
vendored
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@ -11719,6 +11719,56 @@ as_fn_error $? "libm not found on the system
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See \`config.log' for more details" "$LINENO" 5 ; }
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
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$as_echo_n "checking for dlopen in -ldl... " >&6; }
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if test "${ac_cv_lib_dl_dlopen+set}" = set; then :
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$as_echo_n "(cached) " >&6
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else
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ac_check_lib_save_LIBS=$LIBS
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LIBS="-ldl $LIBS"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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/* Override any GCC internal prototype to avoid an error.
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Use char because int might match the return type of a GCC
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builtin and then its argument prototype would still apply. */
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#ifdef __cplusplus
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extern "C"
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#endif
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char dlopen ();
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int
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main ()
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{
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return dlopen ();
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_link "$LINENO"; then :
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ac_cv_lib_dl_dlopen=yes
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else
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ac_cv_lib_dl_dlopen=no
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fi
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rm -f core conftest.err conftest.$ac_objext \
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conftest$ac_exeext conftest.$ac_ext
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LIBS=$ac_check_lib_save_LIBS
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
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$as_echo "$ac_cv_lib_dl_dlopen" >&6; }
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if test "x$ac_cv_lib_dl_dlopen" = x""yes; then :
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cat >>confdefs.h <<_ACEOF
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#define HAVE_LIBDL 1
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_ACEOF
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|
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LIBS="-ldl $LIBS"
|
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|
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else
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{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
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$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
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as_fn_error $? "libdl not found on the system
|
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See \`config.log' for more details" "$LINENO" 5 ; }
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fi
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if test "x$prefix" == x/usr; then :
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CORR_RULES_PREFIX="/etc/snort/corr_rules"
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@ -11956,7 +12006,7 @@ _ACEOF
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fi
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|
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for ac_header in inttypes.h limits.h stddef.h stdlib.h string.h unistd.h wchar.h math.h
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for ac_header in dirent.h dlfcn.h inttypes.h limits.h math.h stddef.h stdlib.h string.h unistd.h wchar.h
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do :
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as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
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ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
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|
|
|
@ -136,6 +136,7 @@ AS_IF([test "x$with_graphviz" != xno],
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AC_CHECK_LIB([xml2], [xmlReaderForFile],, AC_MSG_FAILURE(libxml2 not found on the system))
|
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AC_CHECK_LIB([pthread], [pthread_create],, AC_MSG_FAILURE(libpthread not found on the system))
|
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AC_CHECK_LIB([m], [sqrt],, AC_MSG_FAILURE(libm not found on the system))
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AC_CHECK_LIB([dl], [dlopen],, AC_MSG_FAILURE(libdl not found on the system))
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AS_IF([test "x$prefix" == x/usr],
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[AC_SUBST([CORR_RULES_PREFIX], ["/etc/snort/corr_rules"])],
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|
@ -161,7 +162,7 @@ AS_IF([test "x$with_graphviz" != xno],
|
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[AC_DEFINE([HAVE_BOOLEAN], [1], [Check if the boolean type is defined])])
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|
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AC_FUNC_ALLOCA
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AC_CHECK_HEADERS([inttypes.h limits.h stddef.h stdlib.h string.h unistd.h wchar.h math.h],,AC_MSG_ERROR(At least one of the required headers was not found))
|
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AC_CHECK_HEADERS([dirent.h dlfcn.h inttypes.h limits.h math.h stddef.h stdlib.h string.h unistd.h wchar.h],,AC_MSG_ERROR(At least one of the required headers was not found))
|
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# Check for int types
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AC_CHECK_TYPES([u_int8_t,u_int16_t,u_int32_t,u_int64_t,uint8_t,uint16_t,uint32_t,uint64_t])
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|
|
3
corr_modules/Makefile
Normal file
3
corr_modules/Makefile
Normal file
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@ -0,0 +1,3 @@
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all:
|
||||
gcc -I. -I.. -I../uthash -I../base64 -I../fsom -I../include -D_GNU_SOURCE -Wall -pedantic -pedantic-errors -std=c99 -fPIC -shared -rdynamic -o libsf_ai_corr_example.so libsf_ai_corr_example.c
|
||||
|
37
corr_modules/libsf_ai_corr_example.c
Normal file
37
corr_modules/libsf_ai_corr_example.c
Normal file
|
@ -0,0 +1,37 @@
|
|||
/*
|
||||
* =====================================================================================
|
||||
*
|
||||
* Filename: libsf_ai_corr_example.c
|
||||
*
|
||||
* Description: Sample correlation module for two alerts
|
||||
*
|
||||
* Version: 0.1
|
||||
* Created: 26/10/2010 14:23:24
|
||||
* Revision: none
|
||||
* Compiler: gcc
|
||||
*
|
||||
* Author: BlackLight (http://0x00.ath.cx), <blacklight@autistici.org>
|
||||
* Licence: GNU GPL v.3
|
||||
* Company: DO WHAT YOU WANT CAUSE A PIRATE IS FREE, YOU ARE A PIRATE!
|
||||
*
|
||||
* =====================================================================================
|
||||
*/
|
||||
|
||||
#include "spp_ai.h"
|
||||
|
||||
/** Function that, given two alerts, returns a correlation index in [0,1] */
|
||||
|
||||
double
|
||||
AI_corr_index ( const AI_snort_alert *a, const AI_snort_alert *b )
|
||||
{
|
||||
return 0.5;
|
||||
}
|
||||
|
||||
/** Function that returns the weight of this index */
|
||||
|
||||
double
|
||||
AI_corr_index_weight ()
|
||||
{
|
||||
return 0.0;
|
||||
}
|
||||
|
BIN
corr_modules/libsf_ai_corr_example.so
Executable file
BIN
corr_modules/libsf_ai_corr_example.so
Executable file
Binary file not shown.
|
@ -102,9 +102,7 @@ __AI_correlated_alerts_to_dot ( AI_alert_correlation *corr, FILE *fp )
|
|||
src_port1[10],
|
||||
dst_port1[10],
|
||||
src_port2[10],
|
||||
dst_port2[10],
|
||||
*timestamp1,
|
||||
*timestamp2;
|
||||
dst_port2[10];
|
||||
|
||||
if ( !corr )
|
||||
return;
|
||||
|
@ -115,37 +113,27 @@ __AI_correlated_alerts_to_dot ( AI_alert_correlation *corr, FILE *fp )
|
|||
snprintf ( src_port1, sizeof ( src_port1 ), "%d", ntohs ( corr->key.a->tcp_src_port ));
|
||||
snprintf ( dst_port1, sizeof ( dst_port1 ), "%d", ntohs ( corr->key.a->tcp_dst_port ));
|
||||
|
||||
timestamp1 = ctime ( &(corr->key.a->timestamp ) );
|
||||
timestamp1 [ strlen ( timestamp1 ) - 1 ] = 0;
|
||||
|
||||
inet_ntop ( AF_INET, &(corr->key.b->ip_src_addr), src_addr2, INET_ADDRSTRLEN );
|
||||
inet_ntop ( AF_INET, &(corr->key.b->ip_dst_addr), dst_addr2, INET_ADDRSTRLEN );
|
||||
|
||||
snprintf ( src_port2, sizeof ( src_port2 ), "%d", ntohs ( corr->key.b->tcp_src_port ));
|
||||
snprintf ( dst_port2, sizeof ( dst_port2 ), "%d", ntohs ( corr->key.b->tcp_dst_port ));
|
||||
|
||||
timestamp2 = ctime ( &(corr->key.b->timestamp ) );
|
||||
timestamp2 [ strlen ( timestamp2 ) - 1 ] = 0;
|
||||
|
||||
fprintf ( fp,
|
||||
"\t\"[%d.%d.%d] %s\\n"
|
||||
"%s:%s -> %s:%s\\n"
|
||||
"%s\\n"
|
||||
"(%d alerts grouped)\" -> "
|
||||
|
||||
"\"[%d.%d.%d] %s\\n"
|
||||
"%s:%s -> %s:%s\\n"
|
||||
"%s\\n"
|
||||
"(%d alerts grouped)\";\n",
|
||||
|
||||
corr->key.a->gid, corr->key.a->sid, corr->key.a->rev, corr->key.a->desc,
|
||||
src_addr1, src_port1, dst_addr1, dst_port1,
|
||||
timestamp1,
|
||||
corr->key.a->grouped_alerts_count,
|
||||
|
||||
corr->key.b->gid, corr->key.b->sid, corr->key.b->rev, corr->key.b->desc,
|
||||
src_addr2, src_port2, dst_addr2, dst_port2,
|
||||
timestamp2,
|
||||
corr->key.b->grouped_alerts_count
|
||||
);
|
||||
} /* ----- end of function __AI_correlated_alerts_to_dot ----- */
|
||||
|
@ -1230,7 +1218,10 @@ AI_alert_correlation_thread ( void *arg )
|
|||
bayesian_correlation = 0.0,
|
||||
neural_correlation = 0.0;
|
||||
|
||||
size_t n_correlations = 0;
|
||||
size_t n_correlations = 0,
|
||||
n_corr_functions = 0,
|
||||
n_corr_weights = 0;
|
||||
|
||||
FILE *fp = NULL;
|
||||
|
||||
AI_alert_correlation_key corr_key;
|
||||
|
@ -1255,6 +1246,12 @@ AI_alert_correlation_thread ( void *arg )
|
|||
graph_t *g = NULL;
|
||||
#endif
|
||||
|
||||
double (**corr_functions)( const AI_snort_alert*, const AI_snort_alert* ) = NULL;
|
||||
double (**corr_weights)() = NULL;
|
||||
|
||||
corr_functions = AI_get_corr_functions( &n_corr_functions );
|
||||
corr_weights = AI_get_corr_weights ( &n_corr_weights );
|
||||
|
||||
pthread_mutex_init ( &mutex, NULL );
|
||||
|
||||
/* Start the thread for parsing manual correlations from XML */
|
||||
|
@ -1377,6 +1374,19 @@ AI_alert_correlation_thread ( void *arg )
|
|||
n_correlations++;
|
||||
}
|
||||
|
||||
/* Get the correlation indexes from extra correlation modules */
|
||||
if (( corr_functions ))
|
||||
{
|
||||
for ( i=0; i < n_corr_functions; i++ )
|
||||
{
|
||||
if ( corr_weights[i]() != 0.0 )
|
||||
{
|
||||
corr->correlation += corr_weights[i]() * corr_functions[i] ( corr_key.a, corr_key.b );
|
||||
n_correlations++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if ( n_correlations != 0 )
|
||||
{
|
||||
corr->correlation /= (double) n_correlations;
|
||||
|
|
151
modules.c
Normal file
151
modules.c
Normal file
|
@ -0,0 +1,151 @@
|
|||
/*
|
||||
* =====================================================================================
|
||||
*
|
||||
* Filename: modules.c
|
||||
*
|
||||
* Description: Support for extra correlation modules
|
||||
*
|
||||
* Version: 0.1
|
||||
* Created: 26/10/2010 01:11:25
|
||||
* Revision: none
|
||||
* Compiler: gcc
|
||||
*
|
||||
* Author: BlackLight (http://0x00.ath.cx), <blacklight@autistici.org>
|
||||
* Licence: GNU GPL v.3
|
||||
* Company: DO WHAT YOU WANT CAUSE A PIRATE IS FREE, YOU ARE A PIRATE!
|
||||
*
|
||||
* =====================================================================================
|
||||
*/
|
||||
|
||||
#include "spp_ai.h"
|
||||
|
||||
#include <dirent.h>
|
||||
#include <dlfcn.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
|
||||
/** \defgroup modules Software component for loading extra user-provided modules for correlating alerts
|
||||
* @{ */
|
||||
|
||||
PRIVATE double (**corr_functions)(const AI_snort_alert*, const AI_snort_alert*) = NULL;
|
||||
PRIVATE size_t n_corr_functions = 0;
|
||||
|
||||
PRIVATE double (**weight_functions)() = NULL;
|
||||
PRIVATE size_t n_weight_functions = 0;
|
||||
|
||||
/**
|
||||
* \brief Get the correlation functions from the extra correlation modules as array of function pointers
|
||||
* \param n_functions Number of function pointers in the array
|
||||
* \return The array of correlation functions
|
||||
*/
|
||||
|
||||
double
|
||||
(**AI_get_corr_functions ( size_t *n_functions )) (const AI_snort_alert*, const AI_snort_alert*)
|
||||
{
|
||||
*n_functions = n_corr_functions;
|
||||
return corr_functions;
|
||||
} /* ----- end of function AI_get_corr_functions ----- */
|
||||
|
||||
/**
|
||||
* \brief Get the weights of the correlation extra modules as array of function pointers
|
||||
* \param n_functions Number of function pointers in the array
|
||||
* \return The array of correlation weights functions
|
||||
*/
|
||||
|
||||
double
|
||||
(**AI_get_corr_weights ( size_t *n_functions )) ()
|
||||
{
|
||||
*n_functions = n_weight_functions;
|
||||
return weight_functions;
|
||||
} /* ----- end of function AI_get_corr_weights ----- */
|
||||
|
||||
/**
|
||||
* \brief Initialize the extra modules provided by the user
|
||||
*/
|
||||
|
||||
void
|
||||
AI_init_corr_modules ()
|
||||
{
|
||||
void **dl_handles = NULL;
|
||||
DIR *dir = NULL;
|
||||
char *err = NULL;
|
||||
char *fname = NULL;
|
||||
size_t n_dl_handles = 0;
|
||||
struct dirent *dir_info = NULL;
|
||||
|
||||
if ( !( dir = opendir ( config->corr_modules_dir )))
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
while (( dir_info = readdir ( dir )))
|
||||
{
|
||||
if ( preg_match ( "(\\.(l|s)o)|(\\.l?a)", dir_info->d_name, NULL, NULL ))
|
||||
{
|
||||
if ( !( dl_handles = (void**) realloc ( dl_handles, (++n_dl_handles) * sizeof ( void* ))))
|
||||
{
|
||||
AI_fatal_err ( "Fatal dynamic memory allocation error", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
if ( !( fname = (char*) malloc ( strlen ( config->corr_modules_dir ) + strlen ( dir_info->d_name ) + 4 )))
|
||||
{
|
||||
AI_fatal_err ( "Fatal dynamic memory allocation error", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
sprintf ( fname, "%s/%s", config->corr_modules_dir, dir_info->d_name );
|
||||
|
||||
if ( !( dl_handles[n_dl_handles-1] = dlopen ( fname, RTLD_LAZY )))
|
||||
{
|
||||
if (( err = dlerror() ))
|
||||
{
|
||||
_dpd.errMsg ( "dlopen: %s\n", err );
|
||||
}
|
||||
|
||||
AI_fatal_err ( "dlopen error", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
free ( fname );
|
||||
fname = NULL;
|
||||
|
||||
if ( !( corr_functions = (double(**)(const AI_snort_alert*, const AI_snort_alert*))
|
||||
realloc ( corr_functions, (++n_corr_functions) * sizeof ( double(*)(const AI_snort_alert*, const AI_snort_alert*) ))))
|
||||
{
|
||||
AI_fatal_err ( "Fatal dynamic memory allocation error", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
*(void**) (&(corr_functions[ n_corr_functions - 1 ])) = dlsym ( dl_handles[n_dl_handles-1], "AI_corr_index" );
|
||||
|
||||
if ( !corr_functions[ n_corr_functions - 1 ] )
|
||||
{
|
||||
if (( err = dlerror() ))
|
||||
{
|
||||
_dpd.errMsg ( "dlsym: %s\n", err );
|
||||
}
|
||||
|
||||
AI_fatal_err ( "dlsym error", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
if ( !( weight_functions = (double(**)()) realloc ( weight_functions, (++n_weight_functions) * sizeof ( double(*)() ))))
|
||||
{
|
||||
AI_fatal_err ( "Fatal dynamic memory allocation error", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
*(void**) (&(weight_functions[ n_weight_functions - 1 ])) = dlsym ( dl_handles[n_dl_handles-1], "AI_corr_index_weight" );
|
||||
|
||||
if ( !weight_functions[ n_weight_functions - 1 ] )
|
||||
{
|
||||
if (( err = dlerror() ))
|
||||
{
|
||||
_dpd.errMsg ( "dlsym: %s\n", err );
|
||||
}
|
||||
|
||||
AI_fatal_err ( "dlsym error", __FILE__, __LINE__ );
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
closedir ( dir );
|
||||
} /* ----- end of function AI_init_corr_modules ----- */
|
||||
|
||||
/** @} */
|
||||
|
4
neural.c
4
neural.c
|
@ -251,7 +251,7 @@ __AI_som_train ()
|
|||
|
||||
if ( !( res = (DB_result) DB_out_query ( query )))
|
||||
{
|
||||
AI_fatal_err ( "AIPreproc: Query error", __FILE__, __LINE__ );
|
||||
return;
|
||||
}
|
||||
|
||||
num_rows = DB_num_rows ( res );
|
||||
|
@ -277,7 +277,7 @@ __AI_som_train ()
|
|||
{
|
||||
row = (DB_row) DB_fetch_row ( res );
|
||||
|
||||
tuples[i].gid = row[0] ? strtoul ( row[0], NULL, 10 ) : 0;
|
||||
|
||||
tuples[i].sid = row[1] ? strtoul ( row[1], NULL, 10 ) : 0;
|
||||
tuples[i].rev = row[2] ? strtoul ( row[2], NULL, 10 ) : 0;
|
||||
tuples[i].timestamp = row[3] ? (time_t) strtol ( row[3], NULL, 10 ) : (time_t) 0;
|
||||
|
|
48
spp_ai.c
48
spp_ai.c
|
@ -110,6 +110,9 @@ static void AI_init(char *args)
|
|||
sfPolicyUserPolicySet(ex_config, policy_id);
|
||||
sfPolicyUserDataSetCurrent(ex_config, config);
|
||||
|
||||
/* Initialize the extra correlation modules */
|
||||
AI_init_corr_modules();
|
||||
|
||||
/* If the hash_cleanup_interval or stream_expire_interval options are set to zero,
|
||||
* no cleanup will be made on the streams */
|
||||
if ( config->hashCleanupInterval != 0 && config->streamExpireInterval != 0 )
|
||||
|
@ -173,8 +176,9 @@ static AI_config * AI_parse(char *args)
|
|||
char alertfile[1024] = { 0 },
|
||||
alert_history_file[1024] = { 0 },
|
||||
clusterfile[1024] = { 0 },
|
||||
corr_rules_dir[1024] = { 0 },
|
||||
corr_alerts_dir[1024] = { 0 },
|
||||
corr_modules_dir[1024] = { 0 },
|
||||
corr_rules_dir[1024] = { 0 },
|
||||
webserv_dir[1024] = { 0 },
|
||||
webserv_banner[1024] = { 0 };
|
||||
|
||||
|
@ -209,6 +213,7 @@ static AI_config * AI_parse(char *args)
|
|||
clusterfile_len = 0,
|
||||
cluster_max_alert_interval = 0,
|
||||
corr_alerts_dir_len = 0,
|
||||
corr_modules_dir_len = 0,
|
||||
corr_rules_dir_len = 0,
|
||||
correlation_graph_interval = 0,
|
||||
database_parsing_interval = 0,
|
||||
|
@ -224,6 +229,7 @@ static AI_config * AI_parse(char *args)
|
|||
has_stream_expire_interval = false,
|
||||
has_correlation_interval = false,
|
||||
has_corr_alerts_dir = false,
|
||||
has_corr_modules_dir = false,
|
||||
has_database_interval = false,
|
||||
has_webserv_dir = false,
|
||||
has_webserv_banner = false,
|
||||
|
@ -791,6 +797,46 @@ static AI_config * AI_parse(char *args)
|
|||
|
||||
_dpd.logMsg(" webserv_dir: %s\n", config->webserv_dir);
|
||||
|
||||
/* Parsing the corr_modules_dir option */
|
||||
if (( arg = (char*) strcasestr( args, "corr_modules_dir" ) ))
|
||||
{
|
||||
for ( arg += strlen("corr_modules_dir");
|
||||
*arg && *arg != '"';
|
||||
arg++ );
|
||||
|
||||
if ( !(*(arg++)) )
|
||||
{
|
||||
AI_fatal_err ( "corr_modules_dir option used but no filename specified", __FILE__, __LINE__ );
|
||||
}
|
||||
|
||||
for ( corr_modules_dir[ (++corr_modules_dir_len)-1 ] = *arg;
|
||||
*arg && *arg != '"' && corr_modules_dir_len < sizeof ( corr_modules_dir );
|
||||
arg++, corr_modules_dir[ (++corr_modules_dir_len)-1 ] = *arg );
|
||||
|
||||
if ( corr_modules_dir[0] == 0 || corr_modules_dir_len <= 1 ) {
|
||||
has_corr_modules_dir = false;
|
||||
} else {
|
||||
if ( corr_modules_dir_len >= sizeof ( corr_modules_dir )) {
|
||||
AI_fatal_err ( "corr_modules_dir path too long ( >= 1024 )", __FILE__, __LINE__ );
|
||||
} else if ( strlen( corr_modules_dir ) == 0 ) {
|
||||
has_corr_modules_dir = false;
|
||||
} else {
|
||||
has_corr_modules_dir = true;
|
||||
corr_modules_dir[ corr_modules_dir_len-1 ] = 0;
|
||||
strncpy ( config->corr_modules_dir, corr_modules_dir, corr_modules_dir_len );
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if ( ! has_corr_modules_dir )
|
||||
{
|
||||
#ifndef HAVE_CONFIG_H
|
||||
AI_fatal_err ( "Unable to read PREFIX from config.h", __FILE__, __LINE__ );
|
||||
#endif
|
||||
|
||||
snprintf ( config->corr_modules_dir, sizeof ( config->corr_modules_dir ), "%s/share/snort_ai_preprocessor/corr_modules", PREFIX );
|
||||
}
|
||||
|
||||
/* Neural network output file */
|
||||
if ( config->neuralNetworkTrainingInterval != 0 )
|
||||
{
|
||||
|
|
11
spp_ai.h
11
spp_ai.h
|
@ -94,7 +94,7 @@
|
|||
/** Default number of alerts needed in the history file or database for letting a certain
|
||||
* heuristic correlation index weight be =~ 0.95 (the weight monotonically increases
|
||||
* with the number of alerts according to a hyperbolic tangent function) */
|
||||
#define DEFAULT_ALERT_CORRELATION_WEIGHT 400
|
||||
#define DEFAULT_ALERT_CORRELATION_WEIGHT 5000
|
||||
|
||||
/** Default web server port */
|
||||
#define DEFAULT_WEBSERV_PORT 7654
|
||||
|
@ -105,7 +105,7 @@
|
|||
/** Cutoff y value in the exponential decay for considering two alerts not correlated */
|
||||
#define CUTOFF_Y_VALUE 0.01
|
||||
|
||||
/** Approximated solution of the equation tanh(x) = 0.95 */
|
||||
/** Approximated solution of the equation tanh(x) = 0.95 (used as parameter in the correlation indexes weight function) */
|
||||
#define HYPERBOLIC_TANGENT_SOLUTION 1.83178
|
||||
|
||||
/****************************/
|
||||
|
@ -233,6 +233,9 @@ typedef struct
|
|||
* and in the footer of error pages */
|
||||
char webserv_banner[1024];
|
||||
|
||||
/** Directory containing extra correlation modules */
|
||||
char corr_modules_dir[1024];
|
||||
|
||||
/** Alert file */
|
||||
char alertfile[1024];
|
||||
|
||||
|
@ -486,6 +489,7 @@ void AI_pkt_enqueue ( SFSnortPacket* );
|
|||
void AI_set_stream_observed ( struct pkt_key key );
|
||||
void AI_hierarchies_build ( hierarchy_node**, int );
|
||||
void AI_free_alerts ( AI_snort_alert *node );
|
||||
void AI_init_corr_modules ();
|
||||
|
||||
struct pkt_info* AI_get_stream_by_key ( struct pkt_key );
|
||||
AI_snort_alert* AI_get_alerts ( void );
|
||||
|
@ -508,6 +512,9 @@ void* AI_store_alert_to_db_thread ( void* );
|
|||
void* AI_store_cluster_to_db_thread ( void* );
|
||||
void* AI_store_correlation_to_db_thread ( void* );
|
||||
|
||||
double(**AI_get_corr_functions ( size_t* ))(const AI_snort_alert*, const AI_snort_alert*);
|
||||
double(**AI_get_corr_weights ( size_t* ))();
|
||||
|
||||
/** Function pointer to the function used for getting the alert list (from log file, db, ...) */
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extern AI_snort_alert* (*get_alerts)(void);
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Reference in a new issue