cotugno/syncthing
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Protect GUI HTTPS from some attacks

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- Disable SSLv3 against POODLE
 - Disable RC4 as a weak cipher
 - Set the CommonName to the system host name
This commit is contained in:
Jakob Borg 2014-12-09 10:42:56 +01:00
parent d2c0b8374a
commit fdd458d2fe
3 changed files with 31 additions and 10 deletions
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25
cmd/syncthing/gui.go
View File

@ -70,7 +70,15 @@ func startGUI(cfg config.GUIConfiguration, assetDir string, m *model.Model) erro
if err != nil {
l.Infoln("Loading HTTPS certificate:", err)
l.Infoln("Creating new HTTPS certificate")
newCertificate(confDir, "https-")
// When generating the HTTPS certificate, use the system host name per
// default. If that isn't available, use the "syncthing" default.
name, err := os.Hostname()
if err != nil {
name = tlsDefaultCommonName
}
newCertificate(confDir, "https-", name)
cert, err = loadCert(confDir, "https-")
}
if err != nil {
@ -78,7 +86,20 @@ func startGUI(cfg config.GUIConfiguration, assetDir string, m *model.Model) erro
}
tlsCfg := &tls.Config{
Certificates: []tls.Certificate{cert},
ServerName: "syncthing",
MinVersion: tls.VersionTLS10, // No SSLv3
CipherSuites: []uint16{
// No RC4
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
},
}
rawListener, err := net.Listen("tcp", cfg.Address)

6
cmd/syncthing/main.go
View File

@ -273,7 +273,7 @@ func main() {
l.Warnln("Key exists; will not overwrite.")
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
} else {
newCertificate(dir, "")
newCertificate(dir, "", tlsDefaultCommonName)
cert, err = loadCert(dir, "")
myID = protocol.NewDeviceID(cert.Certificate[0])
if err != nil {
@ -370,7 +370,7 @@ func syncthingMain() {
// Ensure that that we have a certificate and key.
cert, err = loadCert(confDir, "")
if err != nil {
newCertificate(confDir, "")
newCertificate(confDir, "", tlsDefaultCommonName)
cert, err = loadCert(confDir, "")
if err != nil {
l.Fatalln("load cert:", err)
@ -909,7 +909,7 @@ next:
// the certificate and used another name.
certName := deviceCfg.CertName
if certName == "" {
certName = "syncthing"
certName = tlsDefaultCommonName
}
err := remoteCert.VerifyHostname(certName)
if err != nil {

10
cmd/syncthing/tls.go
View File

@ -33,8 +33,8 @@ import (
)
const (
tlsRSABits = 3072
tlsName = "syncthing"
tlsRSABits = 3072
tlsDefaultCommonName = "syncthing"
)
func loadCert(dir string, prefix string) (tls.Certificate, error) {
@ -43,8 +43,8 @@ func loadCert(dir string, prefix string) (tls.Certificate, error) {
return tls.LoadX509KeyPair(cf, kf)
}
func newCertificate(dir string, prefix string) {
l.Infoln("Generating RSA key and certificate...")
func newCertificate(dir, prefix, name string) {
l.Infof("Generating RSA key and certificate for %s...", name)
priv, err := rsa.GenerateKey(rand.Reader, tlsRSABits)
if err != nil {
@ -57,7 +57,7 @@ func newCertificate(dir string, prefix string) {
template := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(mr.Int63()),
Subject: pkix.Name{
CommonName: tlsName,
CommonName: name,
},
NotBefore: notBefore,
NotAfter: notAfter,