Nginx+Naxsi部署专业级web应用防火墙

Naxsi简介：
Naxsi是一个开放源代码、高效、低维护规则的Nginx web应用防火墙模块。Naxsi的主要目标是帮助人们加固他们的web应用程序，以抵御SQL注入、跨站脚本、跨域伪造请求、本地和远程文件包含漏洞。安装配置naxsi模块步骤如下：

一.首先要搭建lnmp环境并添加lua模块：

添加lua模块步骤如下：
1.下载并安装lua模块：

wget http://luajit.org/download/LuaJIT-2.0.1.tar.gz tar zxvfLuaJIT-2.0.1.tar.gz
cd LuaJIT-2.0.1
make && make install

2.下载ngx_devel_kit 和nginx_lua_module并解压

tar zxvfngx_devel_kit-0.2.19.tar.gz
tar zxvflua-nginx-module-0.9.2.tar.gz

3.进入nginx源码文件夹，编译安装nginx
a.导入环境变量

export LUAJIT_LIB=/usr/local/lib
export LUAJIT_INC=/usr/local/include/luajit-2.0

b.查看nginx的先前的configure配置

/usr/local/webserver/nginx/sbin/nginx -V

nginxversion: nginx/1.2.9 configurearguments: --user=www --group=www --prefix=/usr/local/webserver/nginx --with- http_stub_status_module --with-http_ssl_module c.重新编译安装nginx：

cd /tools/nginx-1.2.9
./configure --user=www --group=www --prefix=/usr/local/webserver/nginx --with-http_stub_status_module --with-http_ssl_module --add-module=/tools/ngx_devel_kit-0.2.19 --add-module=/tools/lua-nginx-module-0.9.2

make -j2
make install

此时检查nginx配置文件语法会出现错误：

/usr/local/webserver/nginx/sbin/nginx -t

/usr/local/webserver/nginx/sbin/nginx:error while loading shared libraries: libluajit-5.1.so.2: cannot open sharedobject file: No such file or directory 原因是找不到libluajit-5.1.so.2 解决方法：

find / -name "libluajit-5.1.so.2"

/usr/local/lib/libluajit-5.1.so.2

echo "/usr/local/lib" >>/etc/ld.so.conf
ldconfig
/usr/local/webserver/nginx/sbin/nginx -t

nginx:the configuration file /usr/local/webserver/nginx/conf/nginx.conf syntax is ok nginx:configuration file /usr/local/webserver/nginx/conf/nginx.conf test issuccessful 配置OK。

二.下载naxsi模块：

wget http://naxsi.googlecode.com/files/naxsi-core-0.50.tgz tar zxvf naxsi-core-0.50.tgz

三.关联naxsi模块：

先查看nginx的原有./configure配置，然后复制后并添加naxsi模块的路径：

cd /tools/nginx-1.2.9
./configure --user=www --group=www --prefix=/usr/local/webserver/nginx --with-http_stub_status_module --with-http_ssl_module --add-module=/tools/ngx_devel_kit-0.2.19 --add-module=/tools/lua-nginx-module-0.9.2 --add-module=/tools/naxsi-core-0.50/naxsi_src/

make && make install

4.配置naxsi模块：

官网说明见：
http://code.google.com/p/naxsi/wiki/Howto#Installing_nginx_+_naxsi
1.将naxsi_config目录下核心配置naxsi_core.rules拷贝到nginx/conf/目录下：

cp /tools/naxsi-core-0.50/naxsi_config/naxsi_core.rules /usr/local/webserver/nginx/conf/

2.在nginx/conf/目录下新建naxsi_nbs.rules文件，用以配置使用；

touch naxsi_nbs.rules

3.配置nginx.conf文件：

user www;
worker_processes  1;
events {
worker_connections  1024;
}
http {
include       mime.types;
include/usr/local/webserver/nginx/conf/naxsi_core.rules;
default_type application/octet-stream;
sendfile        on;
keepalive_timeout  65;
server {
listen       80;
server_name  localhost;
location / {
root   html;
index  index.html index.htm;
}
error_page   500 502 503 504  /50x.html;
location = /50x.html {
root   html;
}
location /xss {
include naxsi_nbs.rules;
include naxsi_BasicRule.conf;
default_type 'test/plain';
content_by_lua '
ngx.say("({\'Test xss ,come inplease!!!\'})");
';
root html;
}
location /RequestDenied {
return 403;
}
error_page 403 /403.html;
}
}

4.配置规则文件naxsi_nbs.rules

#LearningMode; #Enables learningmode
SecRulesEnabled;
#SecRulesDisabled;
DeniedUrl "/RequestDenied";
## check rules
CheckRule "$SQL >= 8"BLOCK;
CheckRule "$RFI >= 8"BLOCK;
CheckRule "$TRAVERSAL >=4"
BLOCK; CheckRule "$EVADE >=4" BLOCK;
CheckRule "$XSS >= 8"BLOCK;

5.配置白名单文件naxsi_BasicRule.conf

BasicRule wl:0"mz:$ARGS_VAR:script";
BasicRule wl:0"mz:$ARGS_VAR:id";

这表示xss攻击正常是被拦截的，若被添加白名单，则不被拦截：此处是Get 参数名若为id 或者script，则不被拦截；
BasicRule的规则说明，具体参见：http://code.google.com/p/naxsi/wiki/BasicRule

五.测试naxsi模块

1.检查语法并重启nginx服务：

/usr/local/webserver/nginx/sbin/nginx -t
/usr/local/webserver/nginx/sbin/nginx -s reload

2.测试连接：

http://192.168.1.11/xss/
http://192.168.1.11/xss/?id=40/**/and/**/1=1
http://192.168.1.11/xss/?name=40/**/and/**/1=1
http://192.168.1.11/xss/?name=%28%29
http://192.168.1.11/xss/?term=%3Cscript%3Ewindow.open%28%22
http://192.168.1.11/xss/?title=meta%20http-equiv=%22refresh%22%20content=%220;%22
测试结果：

1通过
2通过，因为配置到白名单
3不通过，含有条件注入
4不通过，特殊字符
5不通过，参数内容含脚本注入
6不通过