package tls import ( "crypto/tls" "crypto/x509" "strings" "sync" "time" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/ocsp" "github.com/xtls/xray-core/common/protocol/tls/cert" "github.com/xtls/xray-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 { if c != nil { certPEM, keyPEM := c.ToPEM() return &Certificate{ Certificate: certPEM, Key: keyPEM, } } return nil } 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) if entry.OcspStapling != 0 { go func(cert *tls.Certificate) { t := time.NewTicker(time.Duration(entry.OcspStapling) * time.Second) for { if newData, err := ocsp.GetOCSPForCert(cert.Certificate); err != nil { newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog() } else if string(newData) != string(cert.OCSPStaple) { cert.OCSPStaple = newData } <-t.C } }(&certs[len(certs)-1]) } } 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() } if c == nil { return &tls.Config{ ClientSessionCache: globalSessionCache, RootCAs: root, InsecureSkipVerify: false, NextProtos: nil, SessionTicketsDisabled: false, } } config := &tls.Config{ ClientSessionCache: globalSessionCache, RootCAs: root, InsecureSkipVerify: c.AllowInsecure, NextProtos: c.NextProtocol, SessionTicketsDisabled: c.DisableSessionResumption, } for _, opt := range opts { opt(config) } 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(config.NextProtos) == 0 { config.NextProtos = []string{"h2", "http/1.1"} } switch c.MinVersion { case "1.0": config.MinVersion = tls.VersionTLS10 case "1.1": config.MinVersion = tls.VersionTLS11 case "1.2": config.MinVersion = tls.VersionTLS12 case "1.3": config.MinVersion = tls.VersionTLS13 } switch c.MaxVersion { case "1.0": config.MaxVersion = tls.VersionTLS10 case "1.1": config.MaxVersion = tls.VersionTLS11 case "1.2": config.MaxVersion = tls.VersionTLS12 case "1.3": config.MaxVersion = tls.VersionTLS13 } if len(c.CipherSuites) > 0 { id := make(map[string]uint16) for _, s := range tls.CipherSuites() { id[s.Name] = s.ID } for _, n := range strings.Split(c.CipherSuites, ":") { if id[n] != 0 { config.CipherSuites = append(config.CipherSuites, id[n]) } } } config.PreferServerCipherSuites = c.PreferServerCipherSuites 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 }