get ceryficate some info like hash or name

[gotshadowbantempaccount]

• can't find the way to use "Cloudflare Origin Certificate"
• use then blocking IP list provided by Cloudflare that ignore many Asian exit countrys Siggapur,Thailand,Laos,Vietnam i.e missing 172.68.6.144 from cloudflare.com/ips/
• try to contact this m-o-r-o-n-s from Cloudflare like year ago but they don't provide basic support as is too expensive

What is my problem:

• need somehow hide my server identify by verify hash of cloudflare certyficate or some basic details about cert

// example nanoexpress use: uWebSockets.js
app.get('/24325325141', async (req, res) => {
       // this is a dummy - users from google please ignore
	res.end( req.cert.CommonName == 'sni.cloudflaressl.com' );

})

[uNetworkingAB]

You want SNI?

[gotshadowbantempaccount]

right now just checking if 'cf-connecting-ip' header exist but need something "real" that can't be spoofed

cloudflare issue a Edge Certificates and in my opinion best way to (without bottleneck) "verify" certificate is to compare "thumbprint" or "SerialNumber"

[uNetworkingAB]

Can you author a coherent message with a clear description of what why how you want here? Are you reporting a bug?

[gotshadowbantempaccount]

Need verify "client certificate" ( Cloudflare Origin Certificate, edge certyficate ) when its connecting to my nanoexpress that use uWebSockets.js

example varible like:
req.clientcert.thumbprint
or
req.clientcert.SerialNumber

if ( req.clientcert.SerialNumber != 3938729374e719838' ) {
res.end( 'not a Cloudflare user' );
}

somthing like in nginx
ssl_client_certificate /etc/nginx/cloudflare.crt;

http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_client_certificate

[gotshadowbantempaccount]

whatever just add in cludflare header to verify in: "HTTP Request Header Modification" and checking value if exist by my secret key

[gillsoftab]

If you use node 15.6.0 or later with uWebSockets.js you could get the identifier of a certificate using this code.

const crypto = require('crypto');

const getCertIdentifier = (cert, unique = true) => {
  try {
    const x509 = new crypto.X509Certificate(Buffer.from(cert));
    return unique ? x509.fingerprint256 : x509.serialNumber;
  } catch {
    return null;
  }
};

const identifier = getCertIdentifier('<cert in pem format>');