Chrome (net::ERR_CERT_COMMON_NAME_INVALID) errors on SSL self-signed certificate

Question

I'm trying to setup a site on localhost using a self-signed certificate for Express.js on Windows 10. Here is the Express.js server code.

index.js

const https = require('https')
const express = require('express')
const app = express()
const fs = require('fs')
const path = require('path')

const httpsOptions = {
    cert: fs.readFileSync(path.resolve(__dirname, 'ssl', 'ca.crt')),
    key: fs.readFileSync(path.resolve(__dirname, 'ssl', 'ca.key'))
}

const router = require('./router')

app.use('/people', router)

https.createServer(httpsOptions, app)
    .listen(3443)

I have also imported the certificate authority ca.crt file to chrome, and restarted chrome. But I still have error on chrome as shown below:

Please guide how to solve this problem Thanks

---

I created the keys and certificate using the following commands.

# certificate authority key
openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out ca.key

# server key
openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out server.key

# certificate authority
openssl req -new -x509 -days 365 -key ca.key -subj "/CN=Test CA/O=Test Organization" -out ca.crt

# certificate signing request
openssl req -new -key server.key -subj "/CN=localhost/O=Test Organization" -out server.csr

# server certificate
openssl x509 -days 365 -req -in server.csr -CAcreateserial -CA ca.crt -CAkey ca.key -out server.crt

# verification
openssl verify -verbose -CAfile ca.crt server.crt

---

System Info

• OpenSSL: 1.1.0e 16 Feb 2017
• Node: 7.7.1
• Windows 10

Answer 1

Spent a couple of hours trying to fix this. The following way worked for me:

Create a config file (for example req.cnf)

[req]
distinguished_name = req_distinguished_name
x509_extensions = v3_req
prompt = no
  [req_distinguished_name]
C = US
ST = VA
L = SomeCity
O = MyCompany
OU = MyDivision
CN = local.com
  [v3_req]
keyUsage = critical, digitalSignature, keyAgreement
extendedKeyUsage = serverAuth
subjectAltName = @alt_names
  [alt_names]
DNS.1 = local.com
IP.1 = 127.0.0.1

and then generate a certificate and private key

 openssl req -x509 -nodes -days 730 -newkey rsa:2048 -keyout local.com.key -out local.com.crt -config req.cnf -sha256