server {

[...]


## 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 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;

}


## Block common exploits

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 403;

}


## Block spam

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 403;

}


## Block 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 403;

}

}