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Move certificate handling into a separate module.

This commit is contained in:
Juliusz Chroboczek 2021-08-19 23:46:04 +02:00
parent 31491aba9b
commit f837c59d60
5 changed files with 11 additions and 197 deletions

1
go.mod
View file

@ -5,6 +5,7 @@ go 1.13
require (
github.com/at-wat/ebml-go v0.16.0
github.com/gorilla/websocket v1.4.2
github.com/jech/cert v0.0.0-20210819231831-aca735647728
github.com/jech/samplebuilder v0.0.0-20210711185346-d34c6dd315fb
github.com/pion/ice/v2 v2.1.10
github.com/pion/rtcp v1.2.6

4
go.sum
View file

@ -22,6 +22,10 @@ github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
github.com/jech/cert v0.0.0-20210819214059-b84cf5e78f7a h1:3VzfD0n6o2Y3FW6cluxqj535fT9Uq3ANaYkG1JuiADI=
github.com/jech/cert v0.0.0-20210819214059-b84cf5e78f7a/go.mod h1:FXUA/zpiQfV4uBVN2kAwkf3X7pU7l1l2ovS45CsSYZs=
github.com/jech/cert v0.0.0-20210819231831-aca735647728 h1:tN+W1ll2oKuJGMCaO1CRK4rr+xSRjVSfWmnKlACdx38=
github.com/jech/cert v0.0.0-20210819231831-aca735647728/go.mod h1:FXUA/zpiQfV4uBVN2kAwkf3X7pU7l1l2ovS45CsSYZs=
github.com/jech/samplebuilder v0.0.0-20210711185346-d34c6dd315fb h1:ctDbFqRHUmxTThbYcTP2cdOVOkECsvhNyQKqeEK7RQQ=
github.com/jech/samplebuilder v0.0.0-20210711185346-d34c6dd315fb/go.mod h1:PXhvo7PKy8CVqirCgoNG2BIjwow2Zd6LwCTScabl584=
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=

View file

@ -1,145 +0,0 @@
package webserver
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"errors"
"log"
"math/big"
"os"
"path/filepath"
"sync"
"sync/atomic"
"time"
)
type certInfo struct {
certificate *tls.Certificate
keyTime time.Time
certTime time.Time
}
// certMu protects writing to certificate
var certMu sync.Mutex
// certificate holds our current certificate, of type certInfo
var certificate atomic.Value
// generateCertificate generates a self-signed certficate
func generateCertificate() (tls.Certificate, error) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return tls.Certificate{}, err
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
now := time.Now()
template := x509.Certificate{
SerialNumber: serialNumber,
NotBefore: now,
NotAfter: now.Add(365 * 24 * time.Hour),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
bytes, err := x509.CreateCertificate(
rand.Reader, &template, &template, &priv.PublicKey, priv,
)
if err != nil {
return tls.Certificate{}, err
}
return tls.Certificate{
Certificate: [][]byte{bytes},
PrivateKey: priv,
}, nil
}
func modTime(filename string) time.Time {
fi, err := os.Stat(filename)
if err != nil {
if !os.IsNotExist(err) {
log.Printf("%v: %v", filename, err)
}
return time.Time{}
}
return fi.ModTime()
}
// loadCertificate returns the current certificate if it is still valid.
func loadCertificate(certFile string, certTime time.Time, keyFile string, keyTime time.Time) *certInfo {
info, ok := certificate.Load().(*certInfo)
if !ok {
return nil
}
if !info.certTime.Equal(certTime) || !info.keyTime.Equal(keyTime) {
return nil
}
return info
}
// storeCertificate returns the current certificate if it is still valid,
// and either reads or generates a new one otherwise.
func storeCertificate(certFile string, certTime time.Time, keyFile string, keyTime time.Time) (info *certInfo, err error) {
certMu.Lock()
defer certMu.Unlock()
// the certificate may have been updated since we checked
info = loadCertificate(certFile, certTime, keyFile, keyTime)
if info != nil {
return
}
var cert tls.Certificate
nocert := certTime.Equal(time.Time{})
nokey := keyTime.Equal(time.Time{})
if nocert != nokey {
err = errors.New("only one of cert.pem and key.pem exists")
return
} else if nokey {
log.Printf("Generating self-signed certificate")
cert, err = generateCertificate()
if err != nil {
return
}
} else {
cert, err = tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return
}
}
info = &certInfo{
certificate: &cert,
certTime: certTime,
keyTime: keyTime,
}
certificate.Store(info)
return
}
func getCertificate(dataDir string) (*tls.Certificate, error) {
certFile := filepath.Join(dataDir, "cert.pem")
keyFile := filepath.Join(dataDir, "key.pem")
certTime := modTime(certFile)
keyTime := modTime(keyFile)
info := loadCertificate(certFile, certTime, keyFile, keyTime)
if info == nil {
var err error
info, err = storeCertificate(
certFile, certTime, keyFile, keyTime,
)
if info == nil || err != nil {
return nil, err
}
}
return info.certificate, nil
}

View file

@ -1,51 +0,0 @@
package webserver
import (
"testing"
)
func TestGenerateCertificate(t *testing.T) {
_, err := generateCertificate()
if err != nil {
t.Errorf("generateCertificate: %v", err)
}
}
func BenchmarkGenerateCertificate(b *testing.B) {
for i := 0; i < b.N; i++ {
_, err := generateCertificate()
if err != nil {
b.Errorf("generateCertificate: %v", err)
}
}
}
func TestGetCertificate(t *testing.T) {
cert1, err := getCertificate("/tmp/no/such/file")
if err != nil {
t.Errorf("getCertificate: %v", err)
}
cert2, err := getCertificate("/tmp/no/such/file")
if err != nil {
t.Errorf("getCertificate: %v", err)
}
if cert1 != cert2 {
t.Errorf("cert1 != cert2")
}
}
func BenchmarkGetCertificate(b *testing.B) {
_, err := getCertificate("/tmp/no/such/file")
if err != nil {
b.Errorf("getCertificate: %v", err)
}
b.StartTimer()
for i := 0; i < b.N; i++ {
_, err := getCertificate("/tmp/no/such/file")
if err != nil {
b.Errorf("getCertificate: %v", err)
}
}
}

View file

@ -22,6 +22,7 @@ import (
"github.com/gorilla/websocket"
"github.com/jech/cert"
"github.com/jech/galene/diskwriter"
"github.com/jech/galene/group"
"github.com/jech/galene/rtpconn"
@ -58,9 +59,13 @@ func Serve(address string, dataDir string) error {
IdleTimeout: 120 * time.Second,
}
if !Insecure {
certificate := cert.New(
filepath.Join(dataDir, "cert.pem"),
filepath.Join(dataDir, "key.pem"),
)
s.TLSConfig = &tls.Config{
GetCertificate: func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
return getCertificate(dataDir)
return certificate.Get()
},
}
}