Merge pull request #195 from Security-Onion-Solutions/feature/zeek_clean

add Zeek clean script

salt/bro/cron/zeek_clean

@@ -0,0 +1,63 @@
+#!/bin/bash
+# Delete Zeek Logs based on defined CRIT_DISK_USAGE value
+
+# Copyright 2014,2015,2016,2017,2018, 2019 Security Onion Solutions, LLC
+
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    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
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+clean () {
+
+SENSOR_DIR='/nsm'
+CRIT_DISK_USAGE=90
+CUR_USAGE=$(df -P $SENSOR_DIR | tail -1 | awk '{print $5}' | tr -d %)
+LOG="/nsm/bro/logs/zeek_clean.log"
+
+if [ "$CUR_USAGE" -gt "$CRIT_DISK_USAGE" ]; then
+    while [ "$CUR_USAGE" -gt "$CRIT_DISK_USAGE" ];
+        do
+                TODAY=$(date -u "+%Y-%m-%d")
+
+                # find the oldest Zeek logs directory and exclude today
+                OLDEST_DIR=$(ls /nsm/bro/logs/ | grep -v "current" | grep -v "stats" | grep -v "packetloss" | grep -v "zeek_clean" | sort | grep -v $TODAY | head -n 1)
+                if [ -z "$OLDEST_DIR" -o "$OLDEST_DIR" == ".." -o "$OLDEST_DIR" == "." ]
+                then
+                        echo "$(date) - No old Zeek logs available to clean up in /nsm/bro/logs/" >> $LOG
+                        exit 0
+                else
+                        echo "$(date) - Removing directory: /nsm/bro/logs/$OLDEST_DIR" >> $LOG
+                        rm -rf /nsm/bro/logs/"$OLDEST_DIR"
+                fi
+
+                # find oldest files in extracted directory and exclude today
+                OLDEST_EXTRACT=$(find /nsm/bro/extracted -type f -printf '%T+ %p\n' 2>/dev/null | sort | grep -v $TODAY | head -n 1)
+                if [ -z "$OLDEST_EXTRACT" -o "$OLDEST_EXTRACT" == ".." -o "$OLDEST_EXTRACT" == "." ]
+                then
+                        echo "$(date) - No old extracted files available to clean up in /nsm/bro/extracted/" >> $LOG
+                else
+                        OLDEST_EXTRACT_DATE=`echo $OLDEST_EXTRACT | awk '{print $1}' | cut -d+ -f1`
+                        OLDEST_EXTRACT_FILE=`echo $OLDEST_EXTRACT | awk '{print $2}'`
+                        echo "$(date) - Removing extracted files for $OLDEST_EXTRACT_DATE" >> $LOG
+                        find /nsm/bro/extracted -type f -printf '%T+ %p\n' | grep $OLDEST_EXTRACT_DATE | awk '{print $2}' |while read FILE
+                        do
+                                echo "$(date) - Removing extracted file: $FILE" >> $LOG
+                                rm -f "$FILE"
+                        done
+                fi
+    done
+else
+  echo "$(date) - CRIT_DISK_USAGE value of $CRIT_DISK_USAGE not greater than current usage of $CUR_USAGE..." >> $LOG
+fi
+}
+
+clean

salt/bro/init.sls

@@ -79,6 +79,21 @@ plcronscript:
     - source: salt://bro/cron/packetloss.sh
     - mode: 755
 
+zeekcleanscript:
+  file.managed:
+    - name: /usr/local/bin/zeek_clean
+    - source: salt://bro/cron/zeek_clean
+    - mode: 755
+
+/usr/local/bin/zeek_clean:
+  cron.present:
+    - user: root
+    - minute: '*'
+    - hour: '*'
+    - daymonth: '*'
+    - month: '*'
+    - dayweek: '*'
+
 /usr/local/bin/packetloss.sh:
   cron.present:
     - user: root