[Nginx] Sécuriser Nginx contre les Exploits, les injections, le spam ..

Sécuriser Nginx contre les Exploits, les injections, le spam ..

Trouver sur le forum de “La Cabane Libre”

Depuis sa mise en place il y a 2 semaines, j’ai beaucoup moins de spams.

Les mots clés qu’il bloque sont assez explicite, a personnaliser en fonction de l’évolution.

Dans sa globalité, ces blocks protège également de différents exploits.

A mettre dans le vhost, dans la balise server {}

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|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;
    }

    ## 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;
    }
[...]
}

Ne reste plus qu’a recharger le service

systemctl reload nginx