linux中两种简单的方法限制ip访问

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gaosmile 发布时间：2020-9-24 22:58

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生产环境中经常会遇到某个ip地址频繁异常的访问nginx网站，此时我们需要通过安全措施保护我们的服务器，接下来为大家介绍几种方式。

实验环境

版本：redhat6.5
ip:172.16.1.100,172.16.10
软件：nginx

172.16.1.10部署nginx

[root@localhost tools]# ls
nginx-1.11.2.tar.gz
[root@localhost tools]# yum  install gcc gcc-c++ make automake autoconf libtool pcre* zlib openssl openssl-devel
[root@localhost tools]# tar xf nginx-1.11.2.tar.gz
[root@localhost tools]# ls
nginx-1.11.2  nginx-1.11.2.tar.gz
[root@localhost tools]# cd nginx-1.11.2
[root@localhost nginx-1.11.2]# ls
auto  CHANGES  CHANGES.ru  conf  configure  contrib  html  LICENSE  man  README  src
[root@localhost nginx-1.11.2]# ./configure
[root@localhost nginx-1.11.2]# make
[root@localhost nginx-1.11.2]# make install

测试nginx服务

[root@localhost ~]# curl -I 172.16.1.100
HTTP/1.1 200 OK
Server: nginx/1.11.2
Date: Mon, 17 Aug 2020 09:36:29 GMT
Content-Type: text/html
Content-Length: 15
Last-Modified: Mon, 17 Aug 2020 09:36:19 GMT
Connection: keep-alive
ETag: "5f3a4f93-f"
Accept-Ranges: bytes

nginx 可以正常访问。
接下来，假设172.16.1.100是黑客主机，频繁访问nginx服务

模拟172.16.1.100访问10次172.16.1.10

172.16.1.100

[root@localhost ~]# ab -c 1 -n 10 http://172.16.1.10/
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 172.16.1.10 (be patient).....done

Server Software:       nginx/1.11.2
Server Hostname:       172.16.1.10
Server Port:          80

Document Path:       /
Document Length:       612 bytes

Concurrency Level:    1
Time taken for tests: 0.016 seconds
Complete requests:    10
Failed requests:       0
Write errors:          0
Total transferred:    8450 bytes
HTML transferred:    6120 bytes
Requests per second: 617.02 [#/sec] (mean)
Time per request:    1.621 [ms] (mean)
Time per request:    1.621 [ms] (mean, across all concurrent requests)
Transfer rate:       509.16 [Kbytes/sec] received

Connection Times (ms)
            min  mean[+/-sd] median max
Connect:       0 1 0.3    0    1
Processing:    1 1 0.3    1    2
Waiting:       0 1 0.3    1    1
Total:       1 1 0.5    1    2
ERROR: The median and mean for the initial connection time are more than twice the standard
   deviation apart. These results are NOT reliable.

Percentage of the requests served within a certain time (ms)
  50%    1
  66%    1
  75%    1
  80%    2
  90%    2
  95%    2
  98%    2
  99%    2
100%    2 (longest request)

查看nginx日志

172.16.1.10

[root@localhost ~]# tail /usr/local/nginx/logs/access.log
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"
172.16.1.100 - - [26/Jul/2020:05:58:24 +0800] "GET / HTTP/1.0" 200 612 "-" "ApacheBench/2.3"

由此可见，一秒钟之内172.16.1.100访问了nginx10次，接下来禁止掉这个问题ip

通过iptables限制ip访问

172.16.1.10

[root@localhost ~]# iptables -I INPUT -s 172.16.1.100 -ptcp --dport 80 -j DROP

172.16.1.100

[root@localhost ~]# curl 172.16.1.10
curl: (7) Failed connect to 172.16.1.10:80; 连接超时

此时172.16.1.100再也不能访问nginx

nginx配置文件限制

172.16.1.10

172.16.1.100

[root@localhost ~]# curl -I 172.16.1.10
HTTP/1.1 403 Forbidden
Server: nginx/1.11.2
Date: Sat, 25 Jul 2020 23:12:06 GMT
Content-Type: text/html
Content-Length: 169
Connection: keep-alive

总结

以上就是两种简单的方法限制ip访问，还有许多方法可以利用工具进行ip限制。