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# ÌìÉúSSHÃÜÔ¿
ssh-keygen -t rsa -b 4096

# ½«¹«Ô¿¸´ÖƵ½Ð§ÀÍÆ÷
ssh-copy-id username@servername

# ½ûÓÃÃÜÂëµÇ¼
sudo nano /etc/ssh/sshd_config
½« PasswordAuthentication ÉèÖÃΪ no

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# ÔÊÐíËùÓÐÍâµØÅþÁ¬
iptables -A INPUT -i lo -j ACCEPT

# ÔÊÐíÒѽ¨ÉèµÄÅþÁ¬
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

# ÔÊÐíSSHÅþÁ¬
iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# ÆäËûËùÓÐÅþÁ¬¾ù¾Ü¾ø
iptables -A INPUT -j DROP

# ÉúÑĹæÔò²¢ÆôÓ÷À»ðǽ
iptables-save > /etc/iptables.rules

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# ¸üÐÂÈí¼þ°üÁбí
sudo apt-get update

# Ö´ÐÐϵͳ¸üÐÂ
sudo apt-get upgrade

# °´ÆÚÖ´ÐиüÐÂʹÃü
sudo crontab -e
Ìí¼ÓÒÔÏÂÐУ¬Ã¿ÖÜ×Ô¶¯Ö´ÐиüУº
0 0 * * 0 apt-get update && apt-get upgrade -y

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# ±à¼­SSHÉèÖÃÎļþ
sudo nano /etc/ssh/sshd_config

# ½«¶Ë¿ÚºÅÐÞ¸ÄΪ·ÇĬÈ϶˿Ú
½« Port 22 ¸ÄΪ Port 2222

# ÖØÆôSSHЧÀÍ
sudo service ssh restart

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# ×°ÖÃSnort
sudo apt-get install snort

# ÉèÖÃÍøÂç½Ó¿Ú
sudo ifconfig eth0 promisc

# Æô¶¯Snort
sudo snort -i eth0 -c /etc/snort/snort.conf

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