使用Nginx+Lua实现waf
技术内容来自：https://github.com/loveshell/ngx_lua_waf
软件包需求：
1 .Nginx兼容性【最后测试到1.13.6】
[root@baolin src]# wget http://nginx.org/download/nginx-1.13.6.tar.gz
2 .PCRE为Nginx编译安装关系的依赖
[root@baolin src]# wget https://jaist.dl.sourceforge.net/project/pcre/pcre/8.42/pcre-8.42.tar.gz
3 .下载luajit解释器和ngx_devel_kit以及lua-nginx-module模块
[root@baolin src]# wget http://luajit.org/download/LuaJIT-2.0.5.tar.gz
[root@baolin src]# wget https://github.com/simplresty/ngx_devel_kit/archive/v0.3.0.tar.gz
[root@baolin src]# wget https://github.com/openresty/lua-nginx-module/archive/v0.10.13.tar.gz
4 .文件解压：
[root@baolin src]# tar xf nginx-1.13.6.tar.gz pcre-8.42.tar.gz LuaJIT-2.0.5.tar.gz v0.3.0.tar.gz v0.10.13.tar.gz
5 .安装LuaJIT Luajit是Lua即时编译器
[root@baolin src]# cd LuaJIT-2.0.5/
[root@baolin LuaJIT-2.0.5]# make && make install
6 .添加环境变量
[root@baolin src]# export LUAJIT_LIB=/usr/local/lib
[root@baolin src]# export LUAJIT_INC=/usr/local/include/luajit-2.0
7 .安装Nginx并加载模块【注意目录位置以及版本】
- --prefix=/usr/local/nginx-1.13.6 # nginx 安装目录
- --with-pcre=/usr/local/src/pcre-8.42 # pcre 所在目录
- --add-module=../ngx_devel_kit-0.3.0/ # ngx_devel_kit 所在目录
- --add-module=../lua-nginx-module-0.10.13/ # lua-nginx-module 所在目录
- -j2 调用编译CPU的核数
[root@baolin src]# cd nginx-1.13.6/
[root@baolin nginx-1.13.6]# ./configure --user=www --group=www --prefix=/usr/local/nginx-1.13.6 --with-pcre=/usr/local/src/pcre-8.42 --with-http_stub_status_module --with-http_sub_module --with-http_gzip_static_module --without-mail_pop3_module --without-mail_imap_module --without-mail_smtp_module --add-module=../ngx_devel_kit-0.3.0/ --add-module=../lua-nginx-module-0.10.13/
[root@baolin nginx-1.13.6]# make -j2 && make install
8 .添加链接文件
[root@baolin src]# ln -s /usr/local/nginx-1.13.6 /usr/local/nginx
[root@baolin src]# ln -s /usr/local/lib/libluajit-5.1.so.2 /lib64/libluajit-5.1.so.2
应用配置
1 .调用lua测试，编辑Nginx.conf 添加/hello
[root@baolin conf]# vim /usr/local/nginx/conf/nginx.conf
worker_processes auto;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
}
location /hello {
default_type 'text/plain';
content_by_lua 'ngx.say("hello,lua")';
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
2 .语法检查并启动
[root@baolin conf]# /usr/local/nginx/sbin/nginx -t
[root@baolin conf]# /usr/local/nginx/sbin/nginx
[root@baolin conf]# curl 192.168.55.110/hello
hello,lua
WAF部署
1 .下载waf源码：
[root@baolin conf]# cd /usr/local/nginx/conf/
[root@baolin conf]# git clone https://github.com/loveshell/ngx_lua_waf.git
[root@baolin conf]# mv ngx_lua_waf/ waf
2 .文件注释
config.lua # 配置文件
init.lua # 规则函数
waf.lua # 逻辑关系
# wafconf # 正则匹配关系目录
wafconf/args # 里面的规则get参数进行过滤的
wafconf/url # 是只在get请求url过滤的规则
wafconf/post # 是只在post请求过滤的规则
wafconf/whitelist # 是白名单，里面的url匹配到不做过滤
wafconf/user-agent # 是对user-agent的过滤规则
3 .config.lua 注释：
RulePath = "/usr/local/nginx/conf/waf/wafconf/"
--规则存放目录
attacklog = "off"
--是否开启攻击信息记录，需要配置logdir
logdir = "/usr/local/nginx/logs/hack/"
--log存储目录，该目录需要用户自己新建，切需要nginx用户的可写权限
UrlDeny="on"
--是否拦截url访问
Redirect="on"
--是否拦截后重定向
CookieMatch = "on"
--是否拦截cookie攻击
postMatch = "on"
--是否拦截post攻击
whiteModule = "on"
--是否开启URL白名单
black_fileExt={"php","jsp"}
--填写不允许上传文件后缀类型
ipWhitelist={"127.0.0.1"}
--ip白名单，多个ip用逗号分隔
ipBlocklist={"1.0.0.1"}
--ip黑名单，多个ip用逗号分隔
CCDeny="on"
--是否开启拦截cc攻击(需要nginx.conf的http段增加lua_shared_dict limit 10m;)
CCrate = "100/60"
--设置cc攻击频率，单位为秒.
--默认1分钟同一个IP只能请求同一个地址100次
html=[[Please go away~~]]
--警告内容,可在中括号内自定义
备注:不要乱动双引号，区分大小写
4 .修改Nginx配置文件引用WAF功能【http段加入】
lua_shared_dict limit 50m;
lua_package_path "/usr/local/nginx/conf/waf/?.lua";
init_by_lua_file "/usr/local/nginx/conf/waf/init.lua";
access_by_lua_file "/usr/local/nginx/conf/waf/waf.lua";
5 .详情：
[root@baolin conf]# cat nginx.conf
worker_processes auto;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
lua_shared_dict limit 50m;
lua_package_path "/usr/local/nginx/conf/waf/?.lua";
init_by_lua_file "/usr/local/nginx/conf/waf/init.lua";
access_by_lua_file "/usr/local/nginx/conf/waf/waf.lua";
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
}
location /hello {
default_type 'text/plain';
content_by_lua 'ngx.say("hello,lua")';
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
6 .创建日志目录给予www用户权限：
[root@baolin conf]# mkdir /usr/local/nginx/logs/hack/
[root@baolin conf]# chown www.www /usr/local/nginx/logs/hack/
7 .启动Nginx 并测试：
[root@baolin conf]# /usr/local/nginx/sbin/nginx -t
[root@baolin conf]# /usr/local/nginx/sbin/nginx -s reload
8 .测试是否阻止请求：
http://192.168.55.110/hello?id=../etc/passwd
9 .通过ab模仿cc攻击：
[root@nq waf]# ab -c 100 -n 1200 http://192.168.55.110/hello
其他
一个页面版WAF--VeryNginx： https://github.com/alexazhou/VeryNginx
知识点：
#启动服务
/opt/verynginx/openresty/nginx/sbin/nginx
#停止服务
/opt/verynginx/openresty/nginx/sbin/nginx -s stop
#重启服务
/opt/verynginx/openresty/nginx/sbin/nginx -s reload
web密码配置：
/opt/verynginx/verynginx/lua_script/VeryNginxConfig.lua
Nginx 配置文件nginx.conf
/opt/verynginx/openresty/nginx/conf/nginx.conf
规则配置：
/opt/verynginx/verynginx/configs/config.json