成功粉碎一起来自四川的网络攻击的过程
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灯火互联
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 | 攻击现象 时间：2011.12.09 14:25 刚才用SecureCRT登录到公司的Linux服务器之后，不久之后再用SecureCRT重新开一屏登录报错“Connection reset by peer”，从本地Linux上使用sftp下载文件也报错： [root@node57 backup]# sftp xxx.xx.xxx.xx Connecting to xxx.xx.xxx.xx... ssh_exchange_identification: Connection closed by remote host Couldn't read packet: Connection reset by peer [root@node57 backup]# sftp xxx.xx.xxx.xx Connecting to xxx.xx.xxx.xx... ssh_exchange_identification: Connection closed by remote host Couldn't read packet: Connection reset by peer 解决过程 幸好，已经登录的那个ssh会话还没有断开，并且能正常响应，先用w命令看一下： [root@web ~]# w 14:29:12 up 494 days, 17:58, 2 users, load average: 0.02, 0.44, 1.15 USER TTY FROM LOGIN@ IDLE Jcpu PCPU WHAT root pts/2 cvsbank 14:08 19.00s 0.63s 0.63s -bash root pts/3 cvsbank 14:16 0.00s 0.33s 0.00s w [root@web ~]# 看上去挺正常。再用netstat看一下： [root@web ~]# netstat -anp | grep :22 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2701/sshd tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3921 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3927 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3911 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3917 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3954 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3953 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3957 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3941 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3946 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3950 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3949 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3986 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3993 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3970 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3968 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3974 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3972 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3973 TIME_WAIT - tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:3977 TIME_WAIT - tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4020 ESTABLISHED 25876/sshd: root [p tcp 808 704 xxx.xx.xxx.xx:22 182.131.134.162:4024 ESTABLISHED 25884/sshd: [accept tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4003 ESTABLISHED 25824/sshd: root [p tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4006 ESTABLISHED 25836/sshd: root [p tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4004 ESTABLISHED 25828/sshd: root [p tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4005 ESTABLISHED 25832/sshd: root [p tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4010 ESTABLISHED 25846/sshd: root [p tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4009 ESTABLISHED 25842/sshd: root [p tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4014 ESTABLISHED 25862/sshd: root [p tcp 0 0 xxx.xx.xxx.xx:22 182.131.134.162:4015 ESTABLISHED 25866/sshd: root [p tcp 0 200 xxx.xx.xxx.xx:22 yy.yyy.yy.yy:47887 ESTABLISHED 19397/3 （其中，xxx.xx.xxx.xx是服务器ip地址，yy.yyy.yy.yy是我的机器的地址。） 哇，这么多相同的地址，看来是有人试图从182.131.134.162来进行ssh登录， 到http://www.ip138.com/查下这个地址： ip138.com IP查询(搜索IP地址的地理位置) 您查询的IP:182.131.134.162 本站主数据：四川省广安市 电信 参考数据一：四川省成都市 电信 我现在要做的是禁止此地址访问： [root@web ~]# iptables -I INPUT -s 182.131.134.162 -j DROP [root@web ~]# 再来看看有没有 [root@web ~]# netstat -anp | grep 182.131.134.162 tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4284 ESTABLISHED 26478/sshd: root [p tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4285 ESTABLISHED 26482/sshd: root [p tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4290 ESTABLISHED 26493/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4291 ESTABLISHED 26498/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4295 ESTABLISHED 26506/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4293 ESTABLISHED 26502/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4298 ESTABLISHED 26510/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4299 ESTABLISHED 26514/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4302 ESTABLISHED 26518/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4303 ESTABLISHED 26522/sshd: root [n 杀掉这些列出的进程 [root@web ~]# kill 26478 26482 26493 26498 26506 26502 26510 26514 26518 26522 [root@web ~]# netstat -anp | grep 182.131.134.162 tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4284 ESTABLISHED 26481/sshd: root [n tcp 0 84 xxx.xx.xxx.xx:22 182.131.134.162:4285 ESTABLISHED 26489/sshd: root [n tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4290 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4291 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4295 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4293 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4298 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4299 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4302 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4303 FIN_WAIT1 - [root@web ~]# kill 26481 26489 [root@web ~]# netstat -anp | grep 182.131.134.162 tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4284 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4285 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4290 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4291 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4295 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4293 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4298 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4299 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4302 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4303 FIN_WAIT1 - [root@web ~]# netstat -anp | grep 182.131.134.162 tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4284 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4285 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4290 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4291 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4295 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4293 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4298 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4299 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4302 FIN_WAIT1 - tcp 0 85 xxx.xx.xxx.xx:22 182.131.134.162:4303 FIN_WAIT1 - [root@web ~]# [root@web ~]# [root@web ~]# [root@web ~]# 过一会再看一下： [root@web ~]# netstat -anp | grep 182.131.134.162 [root@web ~]# 终于搞定了。ssh登录和sftp下文件都正常了。 再次列出关键命令，用于禁止某个ip地址访问服务器： iptables -I INPUT -s 182.131.134.162 -j DROP | |
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