mirror of https://github.com/jetkvm/kvm.git
132 lines
3.0 KiB
Go
132 lines
3.0 KiB
Go
package kvm
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"log"
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"math/big"
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"net"
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"net/http"
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"strings"
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"sync"
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"time"
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)
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const (
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WebSecureListen = ":443"
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WebSecureSelfSignedDefaultDomain = "jetkvm.local"
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WebSecureSelfSignedDuration = 365 * 24 * time.Hour
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)
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var (
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tlsCerts = make(map[string]*tls.Certificate)
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tlsCertLock = &sync.Mutex{}
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)
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// RunWebSecureServer runs a web server with TLS.
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func RunWebSecureServer() {
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r := setupRouter()
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server := &http.Server{
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Addr: WebSecureListen,
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Handler: r,
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TLSConfig: &tls.Config{
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// TODO: cache certificate in persistent storage
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GetCertificate: func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
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var hostname string
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if info.ServerName != "" {
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hostname = info.ServerName
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} else {
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hostname = strings.Split(info.Conn.LocalAddr().String(), ":")[0]
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}
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logger.Infof("TLS handshake for %s, SupportedProtos: %v", hostname, info.SupportedProtos)
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cert := createSelfSignedCert(hostname)
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return cert, nil
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},
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},
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}
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logger.Infof("Starting websecure server on %s", RunWebSecureServer)
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err := server.ListenAndServeTLS("", "")
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if err != nil {
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panic(err)
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}
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}
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func createSelfSignedCert(hostname string) *tls.Certificate {
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if tlsCert := tlsCerts[hostname]; tlsCert != nil {
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return tlsCert
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}
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tlsCertLock.Lock()
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defer tlsCertLock.Unlock()
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logger.Infof("Creating self-signed certificate for %s", hostname)
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priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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log.Fatalf("Failed to generate private key: %v", err)
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}
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keyUsage := x509.KeyUsageDigitalSignature
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notBefore := time.Now()
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notAfter := notBefore.AddDate(1, 0, 0)
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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logger.Errorf("Failed to generate serial number: %v", err)
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}
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dnsName := hostname
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ip := net.ParseIP(hostname)
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if ip != nil {
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dnsName = WebSecureSelfSignedDefaultDomain
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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CommonName: hostname,
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Organization: []string{"JetKVM"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: keyUsage,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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DNSNames: []string{dnsName},
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IPAddresses: []net.IP{},
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}
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if ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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logger.Errorf("Failed to create certificate: %v", err)
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}
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cert := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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if cert == nil {
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logger.Errorf("Failed to encode certificate")
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}
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tlsCert := &tls.Certificate{
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Certificate: [][]byte{derBytes},
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PrivateKey: priv,
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}
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tlsCerts[hostname] = tlsCert
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return tlsCert
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}
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