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ÔÚµ±½ñÊý×Ö»¯Ê±´ú£¬Ð§ÀÍÆ÷µÄÇå¾²ÐÔ±äµÃÓÈΪÖ÷Òª¡£¹¥»÷ÕßʹÓÃÖÖÖÖÎó²îºÍÊÖÒÕ£¬Ò»Ö±ÊÔͼÈëÇÖЧÀÍÆ÷ϵͳ£¬ÇÔÈ¡Êý¾Ý»òÕß¾ÙÐжñÒâ²Ù×÷¡£ÎªÁ˱£»¤Ð§ÀÍÆ÷µÄÇå¾²£¬ÎÒÃÇÐèÒª½ÓÄÉÖÖÖÖ²½·¥À´±ÜÃâÈëÇÖ¡£ÏÂÁîÐй¤¾ßÊÇÒ»¸öÇ¿Ê¢µÄ¹¤¾ß£¬¿ÉÒÔ×ÊÖúÎÒÃÇÌá¸ßЧÀÍÆ÷µÄÇå¾²ÐÔ¡£±¾ÎĽ«ÏÈÈÝһЩ³£ÓõÄÏÂÁîÐй¤¾ß£¬²¢ÌṩÏà¹ØµÄ´úÂëʾÀý¡£

fail2ban

fail2banÊÇÒ»¿îÓÃÓÚ±ÜÃⱩÁ¦ÆƽâµÄ¹¤¾ß¡£Ëüͨ¹ý¼àÊӵǼʵÑé²¢ÔÝʱեȡÀ´×ÔÌض¨IPµØµãµÄ»á¼û£¬´Ó¶øÓÐÓõرÜÃⱩÁ¦Æƽ⹥»÷¡£ÒÔÏÂÊÇ×°ÖúÍÉèÖÃfail2banµÄʾÀý´úÂ룺

# ×°ÖÃfail2ban
sudo apt-get install fail2ban

# ½¨Éè×Ô½ç˵µÄjail.localÉèÖÃÎļþ
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local

# ±à¼­jail.localÎļþ
sudo nano /etc/fail2ban/jail.local

# ÉèÖÃfail2ban¼àÊÓSSHµÇ¼ʵÑé
[sshd]
enabled = true
port = ssh
filter = sshd
logpath = /var/log/auth.log
maxretry = 3
bantime = 86400

# Æô¶¯fail2banЧÀÍ
sudo systemctl start fail2ban

# ÉèÖÃfail2banЧÀÍ¿ª»ú×ÔÆô¶¯
sudo systemctl enable fail2ban

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iptables

iptablesÊÇÒ»¿îÓÃÓÚÉèÖúÍÖÎÀíLinuxÄں˷À»ðǽ¹æÔòµÄ¹¤¾ß¡£Ëü¿ÉÒÔÓÐÓõعýÂËÍøÂçÁ÷Á¿£¬×èÖ¹¶ñÒâÇëÇóºÍ¹¥»÷¡£ÒÔÏÂÊÇһЩ³£¼ûµÄiptablesÏÂÁîʾÀý£º

# Çå¿ÕËùÓеÄiptables¹æÔò
sudo iptables -F

# ÔÊÐíÌض¨IPµØµãµÄ»á¼û
sudo iptables -A INPUT -s 192.168.1.100 -j ACCEPT

# ÔÊÐíÌض¨¶Ë¿ÚµÄ»á¼û
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# ¾Ü¾øËùÓÐÆäËûµÄ»á¼û
sudo iptables -A INPUT -j DROP

# ÉúÑÄiptables¹æÔò
sudo iptables-save > /etc/iptables/rules.v4

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logwatch

logwatchÊÇÒ»¿îÈÕÖ¾ÆÊÎö¹¤¾ß£¬¿ÉÒÔ×ÊÖúÎÒÃǼàÊÓЧÀÍÆ÷ÈÕÖ¾²¢²éÕÒDZÔÚµÄÇå¾²ÎÊÌâ¡£Ëü»á°´ÆÚÆÊÎöϵͳÈÕÖ¾Îļþ£¬ÌìÉúÒ×ÓÚÔĶÁµÄ±¨¸æ£¬²¢·¢Ë͸øÖÎÀíÔ±¡£ÒÔÏÂÊÇ×°ÖúÍÉèÖÃlogwatchµÄʾÀý´úÂ룺

# ×°ÖÃlogwatch
sudo apt-get install logwatch

# ½¨Éè×Ô½ç˵µÄlogwatch.confÉèÖÃÎļþ
sudo cp /usr/share/logwatch/default.conf/logwatch.conf /etc/logwatch/conf/logwatch.conf

# ±à¼­logwatch.confÎļþ
sudo nano /etc/logwatch/conf/logwatch.conf

# ÉèÖÃlogwatch·¢Ëͱ¨¸æ¸øÖÎÀíÔ±µÄÓʼþµØµã
MailTo = admin@example.com

# Æô¶¯logwatchЧÀÍ
sudo logwatch

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