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sudo apt update

sudo apt upgrade

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sudo iptables -A INPUT -p tcp -s 192.168.1.100 –dport 22 -j ACCEPT

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sudo iptables -A INPUT -p tcp -s 192.168.1.0/24 –dport 80 -j ACCEPT

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sudo iptables -A INPUT -j DROP

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sudo apt install fail2ban

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sudo nano /etc/fail2ban/jail.local

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[ssh]

enabled = true

port = ssh

filter = sshd

logpath = /var/log/auth.log

maxretry = 3

bantime = 3600

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sudo service fail2ban restart

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sudo nano /etc/resolv.conf

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nameserver 8.8.8.8

nameserver 8.8.4.4

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Port 2222

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PermitRootLogin no

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AllowUsers user1 user2

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PasswordAuthentication no

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LoginGraceTime 60

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PermitEmptyPasswords no

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sudo service ssh restart

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sudo apt install libpam-passwdqc

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sudo nano /etc/pam.d/common-password

Ìí¼ÓÒÔÏÂÐУ¨ÔÚpassword requisiteÐÐÖ®ºó£©£º

password requisite pam_passwdqc.so min=disabled,disabled,16,12,8

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