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gencert.go
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gencert.go
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package tlsutil
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"log"
"math/big"
"time"
)
// GenerateUserCert builds a certificate from a parent cert
func GenerateUserCert(crt, key, username string) (*tls.Certificate, error) {
parent, err := tls.LoadX509KeyPair(crt, key)
if err != nil {
log.Println(err)
return nil, err
}
pk, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
template := &x509.Certificate{
// SerialNumber: serialNumber, TODO: fix sumber generation
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
Organization: []string{"Acme Co"},
CommonName: username, // Will be checked by the server
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
BasicConstraintsValid: true,
}
cert, err := x509.CreateCertificate(rand.Reader, template, parent.Leaf, pk.Public(), parent.PrivateKey)
if err != nil {
return nil, err
}
tlsCert := tls.Certificate{
Certificate: [][]byte{cert},
PrivateKey: pk,
}
return &tlsCert, nil
}
/*
p, ok := peer.FromContext(ctx)
if !ok {
return status.Error(codes.Unauthenticated, "no peer found")
}
tlsAuth, ok := p.AuthInfo.(credentials.TLSInfo)
if !ok {
return status.Error(codes.Unauthenticated, "unexpected peer transport credentials")
}
if len(tlsAuth.State.VerifiedChains) == 0 || len(tlsAuth.State.VerifiedChains[0]) == 0 {
return status.Error(codes.Unauthenticated, "could not verify peer certificate")
}
// Check subject common name against configured username
if tlsAuth.State.VerifiedChains[0][0].Subject.CommonName != a.Username {
return status.Error(codes.Unauthenticated, "invalid subject common name")
}
return nil
*/