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tls.go
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tls.go
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// MIT License
//
// (C) Copyright [2018-2021] Hewlett Packard Enterprise Development LP
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"os"
"strings"
"time"
)
func (s *SmD) setupCerts(certPath string, keyPath string) error {
err := s.checkCertPath(certPath, keyPath)
// Generate certificate if one does not already exist.
if err != nil {
// This will obviously fail.
if certPath == "" || keyPath == "" {
s.LogAlways("Cert or key path was the empty string")
return err
}
s.LogAlways("generate Certs")
hostname, hostnameErr := os.Hostname()
if hostnameErr != nil {
s.LogAlways("Getting hostname: %s", err)
}
err = s.generateCerts(certPath, keyPath, hostname)
if err != nil {
s.LogAlways("Error: Couldn't create https certs.")
}
return err
}
s.LogAlways("Found existing certs")
return nil
}
//CheckCertPath - See if certs already exist
func (s *SmD) checkCertPath(certPath string, keyPath string) error {
if _, err := os.Stat(certPath); os.IsNotExist(err) {
return err
} else if _, err := os.Stat(keyPath); os.IsNotExist(err) {
return err
}
return nil
}
//
// GenerateCerts - create rsa certs / keys
//
func (s *SmD) generateCerts(certPath string, keyPath string, host string) error {
var priv interface{}
var err error
validFor := 10 * 365 * 24 * time.Hour
rsaBits := 2048
priv, err = rsa.GenerateKey(rand.Reader, rsaBits)
if err != nil {
s.LogAlways("Failed to generate private key: %s!", err)
return err
}
var notBefore = time.Now()
notAfter := notBefore.Add(validFor)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
s.LogAlways("Failed to generate serial number: %s!", err)
return err
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Cray Inc."},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
hosts := strings.Split(host, ",")
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
derBytes, err := x509.CreateCertificate(rand.Reader,
&template,
&template,
&priv.(*rsa.PrivateKey).PublicKey,
priv)
if err != nil {
s.LogAlways("Failed to create certificate: %s!", err)
return err
}
certOut, err := os.Create(certPath)
if err != nil {
s.LogAlways("Failed to open %s for writing: %s!", certPath, err)
return err
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
s.LogAlways("Wrote %s", certPath)
keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
s.LogAlways("Failed to open %s for writing: %s", keyPath, err)
return err
}
pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv.(*rsa.PrivateKey))})
keyOut.Close()
s.LogAlways("Wrote %s", keyPath)
return nil
}