Nginx Lua Redis防止CC攻击实现原理：同一个外网IP、同一个网址(ngx.var.request_uri)、同一个客户端(http_user_agent)在某一段时间(CCseconds)内访问某个网址(ngx.var.request_uri)超过指定次数(CCcount)，则禁止这个外网IP+同一个客户端(md5(IP+ngx.var.http_user_agent)访问这个网址(ngx.var.request_uri)一段时间(blackseconds)。
该脚本使用lua编写(依赖nginx+lua)，将信息写到redis(依赖redis.lua)。
Nginx lua模块安装
重新编译nginx，安装lua模块，或者直接使用《OneinStack》安装OpenResty自带改模块
- pushd /root/oneinstack/src
- wget -c http://nginx.org/download/nginx-1.12.1.tar.gz
- wget -c http://mirrors.linuxeye.com/oneinstack/src/openssl-1.0.2l.tar.gz
- wget -c http://mirrors.linuxeye.com/oneinstack/src/pcre-8.41.tar.gz
- wget -c http://luajit.org/download/LuaJIT-2.0.5.tar.gz
- git clone https://github.com/simpl/ngx_devel_kit.git
- git clone https://github.com/openresty/lua-nginx-module.git
- tar xzf nginx-1.12.1.tar.gz
- tar xzf openssl-1.0.2l.tar.gz
- tar xzf pcre-8.41.tar.gz
- tar xzf LuaJIT-2.0.5.tar.gz
- pushd LuaJIT-2.0.5
- make && make install
- popd
- pushd nginx-1.12.1
- ./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_stub_status_module --with-http_v2_module --with-http_ssl_module --with-http_gzip_static_module --with-http_realip_module --with-http_flv_module --with-http_mp4_module --with-openssl=../openssl-1.0.2l --with-pcre=../pcre-8.41 --with-pcre-jit --with-ld-opt=-ljemalloc --add-module=../lua-nginx-module --add-module=../ngx_devel_kit
- make
- mv /usr/local/nginx/sbin/nginx{,_bk}
- cp objs/nginx /usr/local/nginx/sbin
- nginx -t #检查语法
加载redis.lua
- mkdir /usr/local/nginx/conf/lua
- cd /usr/local/nginx/conf/lua
- wget https://github.com/openresty/lua-resty-redis/raw/master/lib/resty/redis.lua
在/usr/local/nginx/conf/nginx.conf http { }中添加：
- #the Nginx bundle:
- lua_package_path “/usr/local/nginx/conf/lua/redis.lua;;”;
防止CC规则waf.lua
将下面内容保存在/usr/local/nginx/conf/lua/waf.lua
- local get_headers = ngx.req.get_headers
- local ua = ngx.var.http_user_agent
- local uri = ngx.var.request_uri
- local url = ngx.var.host .. uri
- local redis = require 'redis'
- local red = redis.new()
- local CCcount = 20
- local CCseconds = 60
- local RedisIP = '127.0.0.1'
- local RedisPORT = 6379
- local blackseconds = 7200
- if ua == nil then
- ua = "unknown"
- end
- if (uri == "/wp-admin.php") then
- CCcount=20
- CCseconds=60
- end
- red:set_timeout(100)
- local ok, err = red.connect(red, RedisIP, RedisPORT)
- if ok then
- red.connect(red, RedisIP, RedisPORT)
- function getClientIp()
- IP = ngx.req.get_headers()["X-Real-IP"]
- if IP == nil then
- IP = ngx.req.get_headers()["x_forwarded_for"]
- end
- if IP == nil then
- IP = ngx.var.remote_addr
- end
- if IP == nil then
- IP = "unknown"
- end
- return IP
- end
- local token = getClientIp() .. "." .. ngx.md5(url .. ua)
- local req = red:exists(token)
- if req == 0 then
- red:incr(token)
- red:expire(token,CCseconds)
- else
- local times = tonumber(red:get(token))
- if times >= CCcount then
- local blackReq = red:exists("black." .. token)
- if (blackReq == 0) then
- red:set("black." .. token,1)
- red:expire("black." .. token,blackseconds)
- red:expire(token,blackseconds)
- ngx.exit(580)
- else
- ngx.exit(580)
- end
- return
- else
- red:incr(token)
- end
- end
- return
- end
Nginx虚拟主机加载waf.lua
在虚拟主机配置文件/usr/local/nginx/conf/vhost/oneinstack.com.conf
- access_by_lua_file “/usr/local/nginx/conf/lua/waf.lua”;
测试
一分钟之内，一个页面快速点击20次以上，登录redis，看到black开通的key即被禁止访问（nginx 503）
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