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iptables

iptablesÊÇLinuxϵͳÖÐ×î³£ÓõķÀ»ðǽ¹¤¾ßÖ®Ò»¡£Ëü¿ÉÒÔÓÃÀ´ÖÎÀíºÍÉèÖÃÍøÂç°ü¹ýÂ˹æÔò£¬´Ó¶ø±£»¤Ð§ÀÍÆ÷ÃâÊܶñÒâ¹¥»÷¡£ÏÂÃæÊÇһЩʹÓÃiptablesµÄʾÀý£º

# ɨ³ýËùÓÐÒÑÓйæÔò
iptables -F
# ÔÊÐíÍâµØ»Ø»·½Ó¿Ú
iptables -A INPUT -i lo -j ACCEPT
# ÔÊÐíÒѽ¨ÉèµÄ¡¢Ïà¹ØµÄ»á»°Á÷Á¿
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
# ÔÊÐíSSHÅþÁ¬
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
# ×èÖ¹ËùÓÐÆäËûÈëÕ¾Á÷Á¿
iptables -A INPUT -j DROP

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fail2ban

fail2banÊÇÒ»¸öÓÃÓÚ±ÜÃâ¶ñÒâµÇ¼ʵÑéµÄ¹¤¾ß¡£Ëü»á¼àÊÓЧÀÍÆ÷µÄÈÕÖ¾Îļþ£¬²¢ÇÒµ±¼ì²âµ½¶à´Îʧ°ÜµÄµÇ¼ʵÑéʱ£¬»á×Ô¶¯ÔÚiptablesÖÐÌí¼Ó×èÖ¹¸ÃIPµØµãµÄ¹æÔò¡£ÏÂÃæÊÇfail2banµÄһЩÉèÖÃʾÀý£º

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sudo apt-get install fail2ban

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sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local

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sudo nano /etc/fail2ban/jail.local

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[sshd]
enabled = true
port = ssh
logpath = /var/log/auth.log
maxretry = 3
findtime = 3600
bantime = 86400

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sudo service fail2ban restart

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rkhunter

rkhunterÊÇÒ»¸öÓÃÓÚ¼ì²éϵͳÖÐDZÔÚ¶ñÒâÈí¼þµÄ¹¤¾ß¡£Ëü»áɨÃèϵͳÎļþºÍĿ¼£¬¼ì²âµ½²»Õý³£µÄÎļþ»òÕßÉèÖúó»á¸ø³öÖÒÑÔ¡£ÒÔÏÂÊÇʹÓÃrkhunterµÄʾÀý£º

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sudo apt-get install rkhunter

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sudo rkhunter --check

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sudo rkhunter --update

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logwatch

logwatchÊÇÒ»¸öÈÕÖ¾ÆÊÎö¹¤¾ß£¬Ëü¿ÉÒÔ×ÊÖúÖÎÀíÔ±¿ìËÙÆÊÎöЧÀÍÆ÷µÄÈÕÖ¾Îļþ£¬·¢Ã÷DZÔÚµÄÇå¾²ÎÊÌâ¡£ÒÔÏÂÊÇʹÓÃlogwatchµÄʾÀý£º

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sudo apt-get install logwatch

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sudo logwatch

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