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查询出恶意穷举密码的IP地址
# cat /var/log/rinetd.log | awk '{print $2}' | awk -F'.' '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -r -n | head -n 50
查看曾经登陆成功的IP地址
grep Accepted /var/log/secure | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b" | sort | uniq
密码登陆用户
# grep "Accepted password" /var/log/secure Feb 15 15:29:31 iZ623qr3xctZ sshd[25181]: Accepted password for root from 157.90.182.21 port 29836 ssh2 Feb 15 16:24:18 iZ623qr3xctZ sshd[22150]: Accepted password for root from 211.90.123.18 port 27553 ssh2
证书登陆用户
# grep "Accepted publickey" /var/log/secure Feb 15 15:51:25 iZ623qr3xctZ sshd[17334]: Accepted publickey for root from 147.90.40.39 port 42252 ssh2: RSA ea:a9:94:d8:03:a7:39:22:05:bb:cc:f5:d8:b2:92:18 Feb 15 16:21:41 iZ623qr3xctZ sshd[19469]: Accepted publickey for root from 147.90.40.39 port 42296 ssh2: RSA ea:a9:94:d8:03:a7:39:22:05:bb:cc:f5:d8:b2:92:18