nginx 防止注入

我们用得最多的无非就是使用php,asp,asp.net这种代码来实现sql防注入***
防御原理：
1. 通过以上配置过滤基本的url中的注入关键字；
2. 当然，数据库中的用户密码得加密存放 ；
3. php程序进行二次过滤，过滤GET和POST变量中的关键字；
4. 生产环境关闭PHP和MySQL的错误信息。

最近网站受到的***比较多，用下面的方法减轻了很多，记录下来以后备用。

#禁止sql注入

if ($query_string ~* ".*[\;\'\<\>].*" ){

    return 404;

}

if ($request_uri ~* "(cost\()|(concat\()") {

    return 404;

}

if ($request_uri ~* "[+|(%20)]union[+|(%20)]") {

    return 404;

}

if ($request_uri ~* "[+|(%20)]and[+|(%20)]") {

    return 404;

}

if ($request_uri ~* "[+|(%20)]select[+|(%20)]") {

    return 404;

}

if ($query_string ~ "(<|%3C).*script.*(>|%3E)") {

    return 404;

}

if ($query_string ~ "GLOBALS(=|[|%[0-9A-Z]{0,2})") {

    return 404;

}

if ($query_string ~ "_REQUEST(=|[|%[0-9A-Z]{0,2})") {

    return 404;

}

if ($query_string ~ "proc/self/environ") {

    return 404;

}

if ($query_string ~ "mosConfig_[a-zA-Z_]{1,21}(=|%3D)") {

    return 404;

}

if ($query_string ~ "base64_(en|de)code(.*)") {

    return 404;

}

if ($query_string ~ "select") {

    return 404;

}

 

#禁止文件注入

## Block file injections

set $block_file_injections 0;

if ($query_string ~ "[a-zA-Z0-9_]=(\.\.//?)+") {

set $block_file_injections 1;

}

if ($query_string ~ "[a-zA-Z0-9_]=/([a-z0-9_.]//?)+") {

    set $block_file_injections 1;

}

if ($block_file_injections = 1) {

    return 444;

}

 

## 禁掉溢出***

set $block_common_exploits 0;

if ($query_string ~ "(<|%3C).*script.*(>|%3E)") {

set $block_common_exploits 1;

}

if ($query_string ~ "GLOBALS(=|[|%[0-9A-Z]{0,2})") {

    set $block_common_exploits 1;

}

if ($query_string ~ "_REQUEST(=|[|%[0-9A-Z]{0,2})") {

    set $block_common_exploits 1;

}

if ($query_string ~ "proc/self/environ") {

    set $block_common_exploits 1;

}

if ($query_string ~ "mosConfig_[a-zA-Z_]{1,21}(=|%3D)") {

    set $block_common_exploits 1;

}

if ($query_string ~ "base64_(en|de)code(.*)") {

    set $block_common_exploits 1;

}

if ($block_common_exploits = 1) {

    return 444;

}

 

## 禁spam字段

set $block_spam 0;

if ($query_string ~ "b(ultram|unicauca|valium|viagra|vicodin|xanax|ypxaieo)b") {

set $block_spam 1;

}

if ($query_string ~ "b(erections|hoodia|huronriveracres|impotence|levitra|libido)b") {

set $block_spam 1;

}

if ($query_string ~ "b(ambien|bluespill|cialis|cocaine|ejaculation|erectile)b") {

set $block_spam 1;

}

if ($query_string ~ "b(lipitor|phentermin|pro[sz]ac|sandyauer|tramadol|troyhamby)b") {

set $block_spam 1;

}

if ($block_spam = 1) {

    return 444;

}

 

## 禁掉user-agents

set $block_user_agents 0;

# Don’t disable wget if you need it to run cron jobs!

#if ($http_user_agent ~ "Wget") {

# set $block_user_agents 1;

#}

# Disable Akeeba Remote Control 2.5 and earlier

if ($http_user_agent ~ "Indy Library") {

set $block_user_agents 1;

}

# Common bandwidth hoggers and hacking tools.

if ($http_user_agent ~ "libwww-perl") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "GetRight") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "GetWeb!") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "Go!Zilla") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "Download Demon") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "Go-Ahead-Got-It") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "TurnitinBot") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "GrabNet") {

set $block_user_agents 1;

}

if ($http_user_agent ~ "WebBench") {

    set $block_user_agents 1;

}

if ($http_user_agent ~ "ApacheBench") {

    set $block_user_agents 1;

}

if ($http_user_agent ~ ^$) {

    set $block_user_agents 1;

}

if ($http_user_agent ~ "Python-urllib") {

    set $block_user_agents 1;

}

if ($block_user_agents = 1) {

return 444;

}

把以上代码保存为block.conf，放在nginx的conf根目录，在需要防护的网站上用include引入就可以了。

include block.conf