2005/Aug/14

ได้ผลไม่ได้ผลไม่รู้นะ เพราะผมตั้งพาสเวิร์ดไว้ยาวมากๆ แต่ที่ทำเพราะรำคาญกับ log file ที่โตเร็วเพราะพวกชอบลองของ

ใครเคยเจอปัญหาแบบนี้มัยครับ

Aug 14 19:22:23 ids sshd[469]: Illegal user tracy from 222.90.77.158
Aug 14 19:22:24 ids sshd[469]: error: Could not get shadow information for NOUSER
Aug 14 19:22:24 ids sshd[469]: Failed password for illegal user tracy from 222.90.77.158 port 46792 ssh2
Aug 14 19:22:27 ids sshd[471]: Illegal user content from 222.90.77.158
Aug 14 19:22:28 ids sshd[471]: error: Could not get shadow information for NOUSER
Aug 14 19:22:28 ids sshd[471]: Failed password for illegal user content from 222.90.77.158 port 47655 ssh2
Aug 14 19:22:31 ids sshd[473]: Illegal user article from 222.90.77.158
Aug 14 19:22:31 ids sshd[473]: error: Could not get shadow information for NOUSER
Aug 14 19:22:31 ids sshd[473]: Failed password for illegal user article from 222.90.77.158 port 47917 ssh2
Aug 14 19:22:33 ids sshd[475]: Illegal user ahernandez from 222.90.77.158
Aug 14 19:22:33 ids sshd[475]: error: Could not get shadow information for NOUSER
Aug 14 19:22:34 ids sshd[475]: Failed password for illegal user ahernandez from 222.90.77.158 port 48144 ssh2
Aug 14 19:22:36 ids sshd[477]: Illegal user alberto from 222.90.77.158
Aug 14 19:22:36 ids sshd[477]: error: Could not get shadow information for NOUSER
Aug 14 19:22:36 ids sshd[477]: Failed password for illegal user alberto from 222.90.77.158 port 48322 ssh2
Aug 14 19:22:39 ids sshd[479]: Illegal user alexandra from 222.90.77.158
Aug 14 19:22:39 ids sshd[479]: error: Could not get shadow information for NOUSER
Aug 14 19:22:40 ids sshd[479]: Failed password for illegal user alexandra from 222.90.77.158 port 48511 ssh2

ยาวเป็นพรืดดดดดดดดดดด

ลองกำหนด rules firewall เพิ่มดังนี้ครับ

iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent \
--set

iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent \
--update --seconds 600 --hitcount 2 -j DROP
เป็นการทำ rate-limit incoming connections   ได้ผลดีที่เดียว  

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