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// +build !confonly
package tls
import (
"crypto/tls"
"crypto/x509"
"strings"
"sync"
"time"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol/tls/cert"
"v2ray.com/core/transport/internet"
)
var (
globalSessionCache = tls.NewLRUClientSessionCache(128)
)
const exp8357 = "experiment:8357"
// ParseCertificate converts a cert.Certificate to Certificate.
func ParseCertificate(c *cert.Certificate) *Certificate {
certPEM, keyPEM := c.ToPEM()
return &Certificate{
Certificate: certPEM,
Key: keyPEM,
}
}
func (c *Config) loadSelfCertPool() (*x509.CertPool, error) {
root := x509.NewCertPool()
for _, cert := range c.Certificate {
if !root.AppendCertsFromPEM(cert.Certificate) {
return nil, newError("failed to append cert").AtWarning()
}
}
return root, nil
}
// BuildCertificates builds a list of TLS certificates from proto definition.
func (c *Config) BuildCertificates() []tls.Certificate {
certs := make([]tls.Certificate, 0, len(c.Certificate))
for _, entry := range c.Certificate {
if entry.Usage != Certificate_ENCIPHERMENT {
continue
}
keyPair, err := tls.X509KeyPair(entry.Certificate, entry.Key)
if err != nil {
newError("ignoring invalid X509 key pair").Base(err).AtWarning().WriteToLog()
continue
}
certs = append(certs, keyPair)
}
return certs
}
func isCertificateExpired(c *tls.Certificate) bool {
if c.Leaf == nil && len(c.Certificate) > 0 {
if pc, err := x509.ParseCertificate(c.Certificate[0]); err == nil {
c.Leaf = pc
}
}
// If leaf is not there, the certificate is probably not used yet. We trust user to provide a valid certificate.
return c.Leaf != nil && c.Leaf.NotAfter.Before(time.Now().Add(-time.Minute))
}
func issueCertificate(rawCA *Certificate, domain string) (*tls.Certificate, error) {
parent, err := cert.ParseCertificate(rawCA.Certificate, rawCA.Key)
if err != nil {
return nil, newError("failed to parse raw certificate").Base(err)
}
newCert, err := cert.Generate(parent, cert.CommonName(domain), cert.DNSNames(domain))
if err != nil {
return nil, newError("failed to generate new certificate for ", domain).Base(err)
}
newCertPEM, newKeyPEM := newCert.ToPEM()
cert, err := tls.X509KeyPair(newCertPEM, newKeyPEM)
return &cert, err
}
func (c *Config) getCustomCA() []*Certificate {
certs := make([]*Certificate, 0, len(c.Certificate))
for _, certificate := range c.Certificate {
if certificate.Usage == Certificate_AUTHORITY_ISSUE {
certs = append(certs, certificate)
}
}
return certs
}
func getGetCertificateFunc(c *tls.Config, ca []*Certificate) func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
var access sync.RWMutex
return func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
domain := hello.ServerName
certExpired := false
access.RLock()
certificate, found := c.NameToCertificate[domain]
access.RUnlock()
if found {
if !isCertificateExpired(certificate) {
return certificate, nil
}
certExpired = true
}
if certExpired {
newCerts := make([]tls.Certificate, 0, len(c.Certificates))
access.Lock()
for _, certificate := range c.Certificates {
if !isCertificateExpired(&certificate) {
newCerts = append(newCerts, certificate)
}
}
c.Certificates = newCerts
access.Unlock()
}
var issuedCertificate *tls.Certificate
// Create a new certificate from existing CA if possible
for _, rawCert := range ca {
if rawCert.Usage == Certificate_AUTHORITY_ISSUE {
newCert, err := issueCertificate(rawCert, domain)
if err != nil {
newError("failed to issue new certificate for ", domain).Base(err).WriteToLog()
continue
}
access.Lock()
c.Certificates = append(c.Certificates, *newCert)
issuedCertificate = &c.Certificates[len(c.Certificates)-1]
access.Unlock()
break
}
}
if issuedCertificate == nil {
return nil, newError("failed to create a new certificate for ", domain)
}
access.Lock()
c.BuildNameToCertificate()
access.Unlock()
return issuedCertificate, nil
}
}
func (c *Config) IsExperiment8357() bool {
return strings.HasPrefix(c.ServerName, exp8357)
}
func (c *Config) parseServerName() string {
if c.IsExperiment8357() {
return c.ServerName[len(exp8357):]
}
return c.ServerName
}
// GetTLSConfig converts this Config into tls.Config.
func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
root, err := c.getCertPool()
if err != nil {
newError("failed to load system root certificate").AtError().Base(err).WriteToLog()
}
config := &tls.Config{
ClientSessionCache: globalSessionCache,
RootCAs: root,
SessionTicketsDisabled: c.DisableSessionResumption,
}
if c == nil {
return config
}
for _, opt := range opts {
opt(config)
}
if !c.AllowInsecureCiphers && len(config.CipherSuites) == 0 {
config.CipherSuites = []uint16{
tls.TLS_AES_128_GCM_SHA256,
tls.TLS_AES_256_GCM_SHA384,
tls.TLS_CHACHA20_POLY1305_SHA256,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
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,
}
}
config.InsecureSkipVerify = c.AllowInsecure
config.Certificates = c.BuildCertificates()
config.BuildNameToCertificate()
caCerts := c.getCustomCA()
if len(caCerts) > 0 {
config.GetCertificate = getGetCertificateFunc(config, caCerts)
}
if sn := c.parseServerName(); len(sn) > 0 {
config.ServerName = sn
}
if len(c.NextProtocol) > 0 {
config.NextProtos = c.NextProtocol
}
if len(config.NextProtos) == 0 {
config.NextProtos = []string{"http/1.1"}
}
return config
}
// Option for building TLS config.
type Option func(*tls.Config)
// WithDestination sets the server name in TLS config.
func WithDestination(dest net.Destination) Option {
return func(config *tls.Config) {
if dest.Address.Family().IsDomain() && config.ServerName == "" {
config.ServerName = dest.Address.Domain()
}
}
}
// WithNextProto sets the ALPN values in TLS config.
func WithNextProto(protocol ...string) Option {
return func(config *tls.Config) {
if len(config.NextProtos) == 0 {
config.NextProtos = protocol
}
}
}
// ConfigFromStreamSettings fetches Config from stream settings. Nil if not found.
func ConfigFromStreamSettings(settings *internet.MemoryStreamConfig) *Config {
if settings == nil {
return nil
}
config, ok := settings.SecuritySettings.(*Config)
if !ok {
return nil
}
return config
}
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