nginx服务器防sql注入/溢出攻击/spam及禁User-agents

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 ($block_user_agents = 1) { 
return 444; 
} 
}

# block sql injections
set $block_sql_injections 0;

if ($request_uri ~* "(cost\()|(concat\()"){set $block_sql_injections 1;}

if ($request_uri ~* "[+|(%20)]union[+|(%20)]") { set $block_sql_injections 1;}
if ($request_uri ~* "[+|(%20)]and[+|(%20)]") {set $block_sql_injections 1;}
if ($request_uri ~* "[+|(%20)]or[+|(%20)]") {set $block_sql_injections 1;}
if ($request_uri ~* "[+|(%20)]select[+|(%20)]") {set $block_sql_injections 1;}

if ($query_string ~* ".*[;'<>].*" ){set $block_sql_injections 1;}
if ($uri ~* (.*)(insert|select|delete|update|count|master|truncate|declare|exec|\*|%|\')(.*)$ ) { set $block_sql_injections 1; }
if ($block_sql_injections = 1) {return 403;}

# block file injections
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 403;}

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|blue\spill|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 403;}

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 $block_user_agents 1;}
if ($block_user_agents = 1) {return 403;}