include/security_headers_middleware.hpp

#pragma once

#include <crow/http_request.h>
#include <crow/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");

        // 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
        res.addHeader("Content-Security-Policy",
                      "default-src 'self'; img-src 'self' data:");
        res.addHeader("X-XSS-Protection", "1; "
                                          "mode=block");
        res.addHeader("X-Content-Type-Options", "nosniff");
        res.addHeader("X-UA-Compatible", "IE=11");

#ifdef BMCWEB_INSECURE_DISABLE_XSS_PREVENTION

        res.addHeader(bf::access_control_allow_origin, "http://localhost:8080");
        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