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ÔÚÄ¿½ñÐÅϢʱ´ú£¬ÍøÂçÇå¾²ÎÊÌâ³ÉΪÁËÒ»¸öºÜÊÇÖ÷ÒªµÄ»°Ìâ¡£×÷ΪЧÀÍÆ÷ÖÎÀíÔ±»òÕßÔÆÅÌËã´ÓÒÃ÷ÈÕߣ¬´î½¨Ò»¸öÇå¾²¿É¿¿µÄЧÀÍÆ÷ÇéÐÎÊÇÖÁ¹ØÖ÷ÒªµÄ¡£±¾ÎĽ«ÏÈÈÝһЩ±Ø±¸µÄLinuxÏÂÁ×ÊÖúÄã´î½¨Ò»¸öÇå¾²µÄLinuxЧÀÍÆ÷ÇéÐΡ£

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sudo apt update
sudo apt upgrade

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sudo apt install iptables
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
sudo iptables -A INPUT -j DROP
sudo iptables-save | sudo tee /etc/iptables/rules.v4

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ÆôÓÃSELinux

SELinux£¨Security-Enhanced Linux£©ÊÇÒ»ÖÖLinuxÄÚºËÇ徲ģ¿é£¬ÓÃÓÚÇ¿ÖÆ»á¼û¿ØÖÆ¡£ÆôÓÃSELinux¿ÉÒÔÌṩÌØÁíÍâÇå¾²²ã¡£ÒÔÏÂÊÇһЩÓëSELinuxÏà¹ØµÄÏÂÁ

sudo apt install selinux-utils selinux-basics selinux-policy-default
sudo selinux-activate
sudo reboot

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SSH£¨Secure Shell£©ÊÇÒ»ÖÖ¼ÓÃܵÄÔ¶³ÌµÇ¼ЭÒ飬·Ç¾­³£ÓÃÓÚЧÀÍÆ÷ÖÎÀí¡£ÒÔÏÂÊÇһЩÉèÖÃSSHÇå¾²µÄÏÂÁ

sudo nano /etc/ssh/sshd_config

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Port 2222
PermitEmptyPasswords no
PermitRootLogin no
PasswordAuthentication no

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sudo systemctl restart ssh

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Fail2banÊÇÒ»¸öÓÃÓÚ±£»¤SSHЧÀÍÃâÊܱ©Á¦Æƽ⹥»÷µÄ¹¤¾ß¡£Ëü¼àÊÓÈÕÖ¾ÎļþÖеĵǼʵÑ飬²¢Æ¾Ö¤ÉèÖõĹæÔò×Ô¶¯·â½û¶ñÒâIPµØµã¡£Ê¹ÓÃÒÔÏÂÏÂÁî×°ÖÃFail2ban£º

sudo apt install fail2ban

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[sshd]
enabled = true
port = 2222
maxretry = 3

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ΪÁ˱£»¤Ð§ÀÍÆ÷ÃâÊܲ¡¶¾ºÍ¶ñÒâÈí¼þµÄË𺦣¬¿ÉÒÔ×°ÖÃÒ»¸ö²¡¶¾É¨Ãè³ÌÐò¡£ClamAVÊÇÒ»¸ö¿ªÔ´µÄ²¡¶¾É¨ÃèÒýÇ棬¿ÉÒÔʹÓÃÒÔÏÂÏÂÁî¾ÙÐÐ×°Öãº

sudo apt install clamav
sudo freshclam

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sudo clamscan -r /

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