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Reject HTTP requests using a non-standard method #78

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Reject HTTP requests using a non-standard method #78

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34 changes: 34 additions & 0 deletions modules/www/www.vcl.tftpl
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,14 @@ sub vcl_recv {
if (!req.http.Fastly-SSL) {
error 801 "Force SSL";
}

# Temporary if statement to test changes before going to production:
%{ if environment == "integration" }
# Reject HTTP requests which don't use a standard method
if (req.method !~ "^(GET|HEAD|POST|PUT|DELETE|CONNECT|OPTIONS|TRACE|PATCH|FASTLYPURGE)") {
error 805 "Method not allowed";
}
%{ endif ~}

%{ if private_extra_vcl_recv != "" ~}
${private_extra_vcl_recv}
Expand Down Expand Up @@ -559,6 +567,32 @@ sub vcl_error {
return (deliver);
}

if (obj.status == 805) {
set obj.status = 405;
set obj.response = "Method not allowed";
set obj.http.Fastly-Backend-Name = "force_method_not_allowed";

synthetic {"
<!DOCTYPE html>
<html>
<head>
<title>Welcome to GOV.UK</title>
<style>
body { font-family: Arial, sans-serif; margin: 0; }
header { background: black; }
h1 { color: white; font-size: 29px; margin: 0 auto; padding: 10px; max-width: 990px; }
p { color: black; margin: 30px auto; max-width: 990px; }
</style>
</head>
<body>
<header><h1>GOV.UK</h1></header>
<p>We cannot find the page you're looking for. Please try searching on <a href="https://www.gov.uk/">GOV.UK</a>.</p>
</body>
</html>"};

return (deliver);
}

${indent(2, file("${module_path}/../shared/_security_txt_response.vcl"))}

%{ if basic_authentication != null }
Expand Down