Redhat/Centos 7 的 Firewalld 有什么好的防 namp 扫描的办法吗？
sstu · 2019-03-22 23:48:10 +08:00 · 3541 次点击这是一个创建于 1851 天前的主题，其中的信息可能已经有所发展或是发生改变。
nginx 日志里经常出现
202.61.87.159 - - [22/Mar/2019:01:56:10 +0800] "GET /nmaplowercheck1553190762 HTTP/1.1" 400 5 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)"
202.61.87.159 - - [22/Mar/2019:01:56:10 +0800] "GET / HTTP/1.0" 400 0 "-" "-"
202.61.87.159 - - [22/Mar/2019:01:56:10 +0800] "POST /sdk HTTP/1.1" 400 5 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)"
202.61.87.159 - - [22/Mar/2019:01:56:10 +0800] "GET /HNAP1 HTTP/1.1" 400 5 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)"
202.61.87.159 - - [22/Mar/2019:01:56:10 +0800] "GET / HTTP/1.1" 400 5 "-" "-"
123.249.13.251 - - [22/Mar/2019:01:56:12 +0800] "GET / HTTP/2.0" 400 0 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
202.61.87.159 - - [22/Mar/2019:02:35:01 +0800] "GET / HTTP/1.0" 400 0 "-" "-"
202.61.87.159 - - [22/Mar/2019:02:35:01 +0800] "GET /nmaplowercheck1553193092 HTTP/1.1" 400 5 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)"
202.61.87.159 - - [22/Mar/2019:02:35:01 +0800] "POST /sdk HTTP/1.1" 400 5 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)"
202.61.87.159 - - [22/Mar/2019:02:35:01 +0800] "GET /HNAP1 HTTP/1.1" 400 5 "-" "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)"
202.61.87.159 - - [22/Mar/2019:02:35:01 +0800] "GET / HTTP/1.1" 200 42248 "-" "-"
目前是临时用 fail2ban，发现 nginx 日志中有 HTTP/1.*的请求就直接封禁 86400s （正常日志一般是 HTTP/2.0 ）
另外搜到的解决办法是 iptables 的规则，而且博文都挺老的，2014 年左右的...
centos7 也换用 firewalld 了
设想是如果 nmap 还是用的这些协议进行扫描，是不是把 iptables 的规则换成 firewalld 就可以了？
#附搜到的 iptables 规则
iptables -F
ptables -A INPUT -p tcp – tcp-flags ALL FIN,URG,PSH -j Drop
ptables -A INPUT -p tcp – tcp-flags SYN,RST SYN,RST -j Drop
ptables -A INPUT -p tcp – tcp-flags SYN,FIN SYN,FIN -j Drop
ptables -A INPUT -p tcp – tcp-flags SyN SYN – dport 80 -j Drop
6 条回复 • 2019-03-23 12:41:15 +08:00
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1
wzw 2019-03-23 00:02:37 +08:00 via iPhone
公网的机器？ 80 被扫，没事吧
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WordTian 2019-03-23 00:09:00 +08:00 via Android  1
只要你的服务还开着，就不可能完全禁止 nmap 扫描，只能说增大扫描难度，或者说增大扫描花费的时间成本
一般来说，用 firewalld 选择合适的 zone，drop 掉所有非服务端口的包也就差不多了 |
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5
wtks1 2019-03-23 10:29:08 +08:00 via Android
其实 centos7 也是可以用 iptables 的啊
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