一、概述

需求：所有访问/webapi/**的请求必须是GET请求，而且根据请求参数过滤不符合规则的非法请求(黑名单),可以返回具体的http状态码，提示客户端IP被列入黑名单，遭到请求的限制

实现思路：通过在Nginx上进行访问限制，通过Lua来灵活实现业务需求，而Redis用于存储黑名单列表。

二、具体实现

1.lua代码

本例中限制规则包括(post请求，ip地址黑名单，请求参数中imsi,tel值和黑名单)

[root@git-server ~]# cat /usr/local/nginx/conf/lua/ipblacklist.luangx.req.read_body()local redis = require "resty.redis"local red = redis.new()red.connect(red, '127.0.0.1', '6379')local myIP = ngx.req.get_headers()["X-Real-IP"]if myIP == nil then   myIP = ngx.req.get_headers()["x_forwarded_for"]endif myIP == nil then   myIP = ngx.var.remote_addrendif ngx.re.match(ngx.var.uri,"^(/webapi/).*$") then    local method = ngx.var.request_method    if method == 'GET' then        local args = ngx.req.get_post_args()        local hasIP = red:sismember('black.ip',myIP)        local hasIMSI = red:sismember('black.imsi',args.imsi)        local hasTEL = red:sismember('black.tel',args.tel)        if hasIP==1 or hasIMSI==1 or hasTEL==1 then            --ngx.say("This is 'Black List' request")            ngx.exit(ngx.HTTP_FORBIDDEN)          end        else            ngx.say("This is 'POST' request")            --ngx.exit(ngx.HTTP_FORBIDDEN)          end         end

2.ngnx的server虚拟主机配置文件

server {        listen       80;        server_name  www.kjios.com kjios.com;        index index.html index.htm index.php;        root /data/www/www.kjios.com;        location ~ .*\.(php|php5)?$        {                fastcgi_pass  unix:/tmp/php-cgi.sock;                fastcgi_index index.php;                include fastcgi.conf;        }        location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$        {                expires 30d;        }        location ~ .*\.(js|css)?$        {                expires 1h;        }        location ~ /webapi/ {           access_by_lua_file /usr/local/nginx/conf/lua/ipblacklist.lua;           default_type 'text/plain';           content_by_lua '                         ngx.say("
 hello lua 
")';        }        access_log  /data/wwwlogs/kjios.com_access.log;}

从新加载nginx服务，使配置文件生效

3.在redis中添加黑名单规则数据

#redis-cli sadd black.ip '153.34.118.50'#redis-cli sadd black.imsi '460123456789' #redis-cli sadd black.tel '15888888888'[root@git-server ~]# redis-cli -h 127.0.0.1 -p 6379127.0.0.1:6379> smembers black.ip1) "124.207.48.234"2) "21.95.1.233"127.0.0.1:6379> smembers black.tel1) "15888888888"127.0.0.1:6379> smembers black.imsi1) "460123456789"127.0.0.1:6379>

4.验证结果

[root@git-server ~]# curl -d "imsi=460123456789&tel=15800000000" "http://www.kjios.com/webapi/111"This is 'POST' request

[root@git-server ~]# tail -3 /data/wwwlogs/kjios.com_access.log 21.95.1.233 - - [05/Jun/2018:23:18:51 +0800] "POST /myapi/111 HTTP/1.1" 404 162 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"21.95.1.233 - - [05/Jun/2018:23:19:00 +0800] "POST /webapi/111 HTTP/1.1" 200 34 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"21.95.1.233 - - [05/Jun/2018:23:20:56 +0800] "POST /webapi/111 HTTP/1.1" 200 34 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"[root@git-server ~]#

登录redis把家里的ip设置为黑名单，来测试

127.0.0.1:6379> sadd black.ip 211.144.7.32(integer) 1127.0.0.1:6379> smembers black.ip1) "211.144.7.32"

去掉家里的ip黑名单测试

127.0.0.1:6379> srem black.ip 211.144.7.32(integer) 1127.0.0.1:6379> smembers black.ip1) "124.207.48.234"2) "21.95.1.233"127.0.0.1:6379>

nginx访问日志如下：

[root@git-server ~]# tail -3 /data/wwwlogs/kjios.com_access.log 211.144.7.32 - - [05/Jun/2018:23:24:37 +0800] "GET /webapi/124?imsi=46&tel=15800 HTTP/1.1" 403 564 "-" "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36"211.144.7.32 - - [05/Jun/2018:23:26:38 +0800] "GET /webapi/124?imsi=46&tel=15800 HTTP/1.1" 200 50 "-" "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36"211.144.7.32 - - [05/Jun/2018:23:26:40 +0800] "GET /webapi/124?imsi=46&tel=15800 HTTP/1.1" 200 50 "-" "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36"

到此处演示完毕，欢迎网友们一块讨论学习lua+ngnx+redis。