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1 file changed, 53 insertions
block_ip_with_iptables.sh(arquivo criado)
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| 1 | + | # 1）屏蔽每分钟访问超过200的IP | |
| 2 | + | ||
| 3 | + | # 方法1：根据访问日志（Nginx为例） | |
| 4 | + | ||
| 5 | + | #!/bin/bash | |
| 6 | + | DATE=$(date +%d/%b/%Y:%H:%M) | |
| 7 | + | ABNORMAL_IP=$(tail -n5000 access.log |grep $DATE |awk '{a[$1]++}END{for(i in a)if(a[i]>100)print i}') | |
| 8 | + | #先tail防止文件过大，读取慢，数字可调整每分钟最大的访问量。awk不能直接过滤日志，因为包含特殊字符。 | |
| 9 | + | for IP in $ABNORMAL_IP; do | |
| 10 | + | if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; | |
| 11 | + | then | |
| 12 | + | iptables -I INPUT -s $IP -j DROP | |
| 13 | + | fi | |
| 14 | + | done | |
| 15 | + | ||
| 16 | + | # 方法2：通过TCP建立的连接 | |
| 17 | + | #!/bin/bash | |
| 18 | + | ABNORMAL_IP=$(netstat -an |awk '$4~/:80$/ && $6~/ESTABLISHED/{gsub(/:[0-9]+/,"",$5);{a[$5]++}}END{for(i in a)if(a[i]>100)print i}') | |
| 19 | + | #gsub是将第五列（客户端IP）的冒号和端口去掉 | |
| 20 | + | for IP in $ABNORMAL_IP; do | |
| 21 | + | if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; then | |
| 22 | + | iptables -I INPUT -s $IP -j DROP | |
| 23 | + | fi | |
| 24 | + | done | |
| 25 | + | ||
| 26 | + | ||
| 27 | + | # 屏蔽每分钟SSH尝试登录超过10次的IP | |
| 28 | + | # 方法1：通过lastb获取登录状态 | |
| 29 | + | ||
| 30 | + | #!/bin/bash | |
| 31 | + | DATE=$(date +"%a %b %e %H:%M") #星期月天时分 %e单数字时显示7，而%d显示07 | |
| 32 | + | ABNORMAL_IP=$(lastb |grep "$DATE" |awk '{a[$3]++}END{for(i in a)if(a[i]>10)print i}') | |
| 33 | + | for IP in $ABNORMAL_IP; do | |
| 34 | + | if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; | |
| 35 | + | then | |
| 36 | + | iptables -I INPUT -s $IP -j DROP | |
| 37 | + | fi | |
| 38 | + | done | |
| 39 | + | ||
| 40 | + | # 方法2：通过日志获取登录状态 | |
| 41 | + | ||
| 42 | + | #!/bin/bash | |
| 43 | + | DATE=$(date +"%b %d %H") | |
| 44 | + | ABNORMAL_IP="$(tail -n10000 /var/log/auth.log |grep "$DATE" |awk '/Failed/{a[$(NF-3)]++}END{for(i in a)if(a[i]>5)print i}')" | |
| 45 | + | for IP in $ABNORMAL_IP; do | |
| 46 | + | if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; then | |
| 47 | + | iptables -A INPUT -s $IP -j DROP | |
| 48 | + | echo "$(date +"%F %T") - iptables -A INPUT -s $IP -j DROP" >>~/ssh-login-limit.log | |
| 49 | + | fi | |
| 50 | + | done | |
| 51 | + | ||
| 52 | + | ||
| 53 | + | ||
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