Nginx中防止SQL注入攻击的相关配置介绍
防止sql注入最好的办法是对于提交后台的所有数据都进行过滤转义。
对于简单的情况,比如包含单引号' , 分号;, <, >, 等字符可通过rewrite直接重订向到404页面来避免。
用rewrite有个前提需要知道,一般用rewrite进行正则匹配只能匹配到网页的URI,也就是url中?前部分,?以后部分是请求参数。
问号后面的请求参数,在nginx用$query_string表 示,不能在rewrite中匹配到,需要用if判断
例如,对于参数中带有单引号的'进行匹配然后定向到错误页面,
/plus/list.php?tid=19&mid=1124' rewrite ^.*([;'<>]).* /error.html break;
直接写这样的一条重写肯定不会正确匹配,因为rewrite参数只会匹配请求的uri,也就是/plus/list.php部分。
需要使用$query_string 借助if进行判断,如果查询串种包含特殊字符,返回404。
if ( $query_string ~* ".*[;'<>].*" ){ return 404; }
下面来分享一个配置文件实例:
server { ## 禁SQL注入 Block SQL injections set $block_sql_injections 0; if ($query_string ~ “union.*select.*(“) { set $block_sql_injections 1; } if ($query_string ~ “union.*all.*select.*”) { set $block_sql_injections 1; } if ($query_string ~ “concat.*(“) { set $block_sql_injections 1; } if ($block_sql_injections = 1) { return 444; } ## 禁掉文件注入 set $block_file_injections 0; if ($query_string ~ “[a-zA-Z0-9_]=http://”) { set $block_file_injections 1; } if ($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; } ## 禁掉溢出攻击 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; } }