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#pragma once
#include <http_request.h>
#include <http_response.h>
namespace crow
{
struct SecurityHeadersMiddleware
{
struct Context
{
};
void beforeHandle(crow::Request& req, Response& res, Context& ctx)
{
#ifdef BMCWEB_INSECURE_DISABLE_XSS_PREVENTION
if ("OPTIONS"_method == req.method())
{
res.end();
}
#endif
}
void afterHandle(Request& req, Response& res, Context& ctx)
{
/*
TODO(ed) these should really check content types. for example,
X-UA-Compatible header doesn't make sense when retrieving a JSON or
javascript file. It doesn't hurt anything, it's just ugly.
*/
using bf = boost::beast::http::field;
res.addHeader(bf::strict_transport_security, "max-age=31536000; "
"includeSubdomains; "
"preload");
res.addHeader(bf::x_frame_options, "DENY");
res.addHeader(bf::pragma, "no-cache");
res.addHeader(bf::cache_control, "no-Store,no-Cache");
res.addHeader("X-XSS-Protection", "1; "
"mode=block");
res.addHeader("X-Content-Type-Options", "nosniff");
#ifndef BMCWEB_INSECURE_DISABLE_XSS_PREVENTION
res.addHeader("Content-Security-Policy", "default-src 'none'; "
"img-src 'self' data:; "
"font-src 'self'; "
"style-src 'self'; "
"script-src 'self'; "
"connect-src 'self' wss:");
// The KVM currently needs to load images from base64 encoded
// strings. img-src 'self' data: is used to allow that.
// https://stackoverflow.com/questions/18447970/content-security-policy-data-not-working-for-base64-images-in-chrome-28
#else
// If XSS is disabled, we need to allow loading from addresses other
// than self, as the BMC will be hosted elsewhere.
res.addHeader("Content-Security-Policy", "default-src 'none'; "
"img-src *; "
"font-src *; "
"style-src *; "
"script-src *; "
"connect-src *");
const std::string_view origin = req.getHeaderValue("Origin");
res.addHeader(bf::access_control_allow_origin, origin);
res.addHeader(bf::access_control_allow_methods, "GET, "
"POST, "
"PUT, "
"PATCH, "
"DELETE");
res.addHeader(bf::access_control_allow_credentials, "true");
res.addHeader(bf::access_control_allow_headers, "Origin, "
"Content-Type, "
"Accept, "
"Cookie, "
"X-XSRF-TOKEN");
#endif
}
};
} // namespace crow
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