I'm creating a Go TCP server (NOT http/s) and I'm trying to configure it to use SSL. I have a StartCom free SSL certificate which I am trying to use to accomplish this. My server code looks like this:
cert, err := tls.LoadX509KeyPair("example.com.pem", "example.com.key")
if err != nil {
fmt.Println("Error loading certificate. ",err)
}
trustCert, err := ioutil.ReadFile("sub.class1.server.ca.pem")
if err != nil {
fmt.Println("Error loading trust certificate. ",err)
}
validationCert, err := ioutil.ReadFile("ca.pem")
if err != nil {
fmt.Println("Error loading validation certificate. ",err)
}
certs := x509.NewCertPool()
if !certs.AppendCertsFromPEM(validationCert) {
fmt.Println("Error installing validation certificate.")
}
if !certs.AppendCertsFromPEM(trustCert) {
fmt.Println("Error installing trust certificate.")
}
sslConfig := tls.Config{RootCAs: certs,Certificates: []tls.Certificate{cert}}
service := ":5555"
tcpAddr, error := net.ResolveTCPAddr("tcp", service)
if error != nil {
fmt.Println("Error: Could not resolve address")
} else {
netListen, error := tls.Listen(tcpAddr.Network(), tcpAddr.String(), &sslConfig)
if error != nil {
fmt.Println(error)
} else {
defer netListen.Close()
for {
fmt.Println("Waiting for clients")
connection, error := netListen.Accept()
I've tried switching around the order of the certs, not including some certs, etc. but the output from openssl s_client -CApath /etc/ssl/certs/ -connect localhost:5555
remains essentially the same, verify error:num=20:unable to get local issuer certificate
. See here for full output. I seem to be doing something wrong with the intermediate certificates, but I have no idea what. I have been working on this for a few days, lots of googling and SO'ing, but nothing seemed to quite fit my situation. I have set up many certificates in Apache and HAProxy, but this really has me stumped.