防攻擊的幾種方法

IT_man

以下參考:
1 \, t0 n7 W& s; I3 Fhttp://serverfault.com/questions/275669/ssh-sshd-how-do-i-set-max-login-attempts
http://www.cnblogs.com/taosim/articles/3134394.html

1) 在/etc/ssh/sshd_config加入下列一行
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1. MaxAuthTries 1

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# G# o" i0 S# C2 c7 A( Y: j6 `" w2) 在防火牆加入下列規則

1. iptables -N SSHATTACK
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2. iptables -A SSHATTACK -j LOG --log-prefix "Possible SSH attack! " --log-level 7
   2 I+ m! C9 S7 y
3. iptables -A SSHATTACK -j DROP

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/ G! M# J6 Z* }' d3) 在/var/log/syslog 觀察可能的ssh攻擊

1. Dec 27 18:01:58 ubuntu kernel: [  510.007570] Possible SSH attack! IN=eth0 OUT= MAC=01:2c:18:47:43:2d:10:c0:31:4d:11:ac:f8:01 SRC=192.168.203.129 DST=192.168.203.128 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=30948 DF PROTO=TCP SPT=53272 DPT=1785 WINDOW=14600 RES=0x00 SYN URGP=0

複製代碼