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yum install epel-release
yum install snort

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cp /etc/snort/snort.conf /etc/snort/snort.conf.backup
vim /etc/snort/snort.conf

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include $RULE_PATH/local.rules
include $RULE_PATH/snort.rules
include $RULE_PATH/community.rules

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cd /etc/snort/rules/

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wget https://www.snort.org/downloads/community/community-rules.tar.gz
tar -xvf community-rules.tar.gz

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vim custom.rules

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alert tcp any any -> any any (msg:"Possible SSH brute force attack"; 
                         flow:from_client,established; content:"SSH-"; 
                         threshold:type limit, track by_src, count 5, 
                         seconds 60; sid:10001; rev:1;)

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snort -A console -c /etc/snort/snort.conf -i eth0

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ÆäÖУ¬-A consoleÖ¸¶¨½«¾¯±¨ÐÂÎÅÊä³öµ½¿ØÖÆ̨£¬-c /etc/snort/snort.confÖ¸¶¨Ê¹ÓÃÎÒÃÇ֮ǰÉèÖõÄSNORTÉèÖÃÎļþ£¬-i eth0Ö¸¶¨Òª¼à¿ØµÄÍøÂç½Ó¿Ú¡£

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yum install barnyard2
yum install sendmail

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cp /etc/barnyard2/barnyard2.conf /etc/barnyard2/barnyard2.conf.backup
vim /etc/barnyard2/barnyard2.conf

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output alert_syslog_full
output database: log, mysql, user=snort password=snort dbname=snort host=localhost
output alert_fast: snort.alert

config reference_file: reference.config
config classification_file:classification.config
config gen_file: gen-msg.map
config sid_file: sid-msg.map

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output alert_full: alert.full
output log_unified2: filename unified2.log, limit 128
output smtp: email@example.com

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barnyard2 -c /etc/barnyard2/barnyard2.conf -d /var/log/snort/

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