mirror of https://github.com/XTLS/Xray-core
379 lines
10 KiB
Go
379 lines
10 KiB
Go
package xtls
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import (
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"crypto/hmac"
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"crypto/x509"
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"encoding/base64"
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"strings"
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"sync"
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"time"
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xtls "github.com/xtls/go"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/ocsp"
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"github.com/xtls/xray-core/common/platform/filesystem"
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"github.com/xtls/xray-core/common/protocol/tls/cert"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/tls"
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)
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var globalSessionCache = xtls.NewLRUClientSessionCache(128)
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// ParseCertificate converts a cert.Certificate to Certificate.
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func ParseCertificate(c *cert.Certificate) *Certificate {
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if c != nil {
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certPEM, keyPEM := c.ToPEM()
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return &Certificate{
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Certificate: certPEM,
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Key: keyPEM,
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}
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}
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return nil
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}
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func (c *Config) loadSelfCertPool() (*x509.CertPool, error) {
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root := x509.NewCertPool()
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for _, cert := range c.Certificate {
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if !root.AppendCertsFromPEM(cert.Certificate) {
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return nil, newError("failed to append cert").AtWarning()
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}
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}
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return root, nil
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}
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// BuildCertificates builds a list of TLS certificates from proto definition.
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func (c *Config) BuildCertificates() []*xtls.Certificate {
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certs := make([]*xtls.Certificate, 0, len(c.Certificate))
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for _, entry := range c.Certificate {
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if entry.Usage != Certificate_ENCIPHERMENT {
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continue
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}
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keyPair, err := xtls.X509KeyPair(entry.Certificate, entry.Key)
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if err != nil {
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newError("ignoring invalid X509 key pair").Base(err).AtWarning().WriteToLog()
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continue
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}
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keyPair.Leaf, err = x509.ParseCertificate(keyPair.Certificate[0])
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if err != nil {
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newError("ignoring invalid certificate").Base(err).AtWarning().WriteToLog()
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continue
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}
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certs = append(certs, &keyPair)
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if !entry.OneTimeLoading {
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var isOcspstapling bool
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hotRelodaInterval := uint64(3600)
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if entry.OcspStapling != 0 {
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hotRelodaInterval = entry.OcspStapling
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isOcspstapling = true
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}
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index := len(certs) - 1
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go func(entry *Certificate, cert *xtls.Certificate, index int) {
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t := time.NewTicker(time.Duration(hotRelodaInterval) * time.Second)
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for {
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if entry.CertificatePath != "" && entry.KeyPath != "" {
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newCert, err := filesystem.ReadFile(entry.CertificatePath)
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if err != nil {
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newError("failed to parse certificate").Base(err).AtError().WriteToLog()
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<-t.C
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continue
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}
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newKey, err := filesystem.ReadFile(entry.KeyPath)
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if err != nil {
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newError("failed to parse key").Base(err).AtError().WriteToLog()
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<-t.C
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continue
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}
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if string(newCert) != string(entry.Certificate) && string(newKey) != string(entry.Key) {
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newKeyPair, err := xtls.X509KeyPair(newCert, newKey)
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if err != nil {
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newError("ignoring invalid X509 key pair").Base(err).AtError().WriteToLog()
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<-t.C
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continue
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}
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if newKeyPair.Leaf, err = x509.ParseCertificate(newKeyPair.Certificate[0]); err != nil {
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newError("ignoring invalid certificate").Base(err).AtError().WriteToLog()
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<-t.C
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continue
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}
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cert = &newKeyPair
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}
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}
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if isOcspstapling {
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if newOCSPData, err := ocsp.GetOCSPForCert(cert.Certificate); err != nil {
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newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
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} else if string(newOCSPData) != string(cert.OCSPStaple) {
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cert.OCSPStaple = newOCSPData
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}
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}
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certs[index] = cert
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<-t.C
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}
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}(entry, certs[index], index)
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}
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}
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return certs
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}
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func isCertificateExpired(c *xtls.Certificate) bool {
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if c.Leaf == nil && len(c.Certificate) > 0 {
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if pc, err := x509.ParseCertificate(c.Certificate[0]); err == nil {
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c.Leaf = pc
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}
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}
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// If leaf is not there, the certificate is probably not used yet. We trust user to provide a valid certificate.
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return c.Leaf != nil && c.Leaf.NotAfter.Before(time.Now().Add(-time.Minute))
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}
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func issueCertificate(rawCA *Certificate, domain string) (*xtls.Certificate, error) {
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parent, err := cert.ParseCertificate(rawCA.Certificate, rawCA.Key)
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if err != nil {
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return nil, newError("failed to parse raw certificate").Base(err)
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}
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newCert, err := cert.Generate(parent, cert.CommonName(domain), cert.DNSNames(domain))
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if err != nil {
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return nil, newError("failed to generate new certificate for ", domain).Base(err)
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}
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newCertPEM, newKeyPEM := newCert.ToPEM()
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cert, err := xtls.X509KeyPair(newCertPEM, newKeyPEM)
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return &cert, err
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}
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func (c *Config) getCustomCA() []*Certificate {
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certs := make([]*Certificate, 0, len(c.Certificate))
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for _, certificate := range c.Certificate {
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if certificate.Usage == Certificate_AUTHORITY_ISSUE {
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certs = append(certs, certificate)
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}
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}
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return certs
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}
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func getGetCertificateFunc(c *xtls.Config, ca []*Certificate) func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
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var access sync.RWMutex
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return func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
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domain := hello.ServerName
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certExpired := false
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access.RLock()
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certificate, found := c.NameToCertificate[domain]
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access.RUnlock()
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if found {
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if !isCertificateExpired(certificate) {
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return certificate, nil
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}
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certExpired = true
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}
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if certExpired {
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newCerts := make([]xtls.Certificate, 0, len(c.Certificates))
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access.Lock()
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for _, certificate := range c.Certificates {
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if !isCertificateExpired(&certificate) {
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newCerts = append(newCerts, certificate)
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}
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}
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c.Certificates = newCerts
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access.Unlock()
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}
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var issuedCertificate *xtls.Certificate
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// Create a new certificate from existing CA if possible
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for _, rawCert := range ca {
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if rawCert.Usage == Certificate_AUTHORITY_ISSUE {
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newCert, err := issueCertificate(rawCert, domain)
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if err != nil {
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newError("failed to issue new certificate for ", domain).Base(err).WriteToLog()
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continue
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}
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access.Lock()
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c.Certificates = append(c.Certificates, *newCert)
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issuedCertificate = &c.Certificates[len(c.Certificates)-1]
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access.Unlock()
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break
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}
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}
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if issuedCertificate == nil {
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return nil, newError("failed to create a new certificate for ", domain)
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}
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access.Lock()
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c.BuildNameToCertificate()
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access.Unlock()
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return issuedCertificate, nil
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}
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}
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func getNewGetCertificateFunc(certs []*xtls.Certificate, rejectUnknownSNI bool) func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
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return func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
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if len(certs) == 0 {
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return nil, errNoCertificates
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}
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sni := strings.ToLower(hello.ServerName)
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if !rejectUnknownSNI && (len(certs) == 1 || sni == "") {
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return certs[0], nil
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}
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gsni := "*"
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if index := strings.IndexByte(sni, '.'); index != -1 {
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gsni += sni[index:]
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}
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for _, keyPair := range certs {
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if keyPair.Leaf.Subject.CommonName == sni || keyPair.Leaf.Subject.CommonName == gsni {
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return keyPair, nil
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}
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for _, name := range keyPair.Leaf.DNSNames {
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if name == sni || name == gsni {
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return keyPair, nil
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}
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}
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}
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if rejectUnknownSNI {
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return nil, errNoCertificates
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}
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return certs[0], nil
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}
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}
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func (c *Config) parseServerName() string {
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return c.ServerName
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}
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func (c *Config) verifyPeerCert(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
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if c.PinnedPeerCertificateChainSha256 != nil {
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hashValue := tls.GenerateCertChainHash(rawCerts)
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for _, v := range c.PinnedPeerCertificateChainSha256 {
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if hmac.Equal(hashValue, v) {
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return nil
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}
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}
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return newError("peer cert is unrecognized: ", base64.StdEncoding.EncodeToString(hashValue))
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}
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return nil
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}
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// GetXTLSConfig converts this Config into xtls.Config.
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func (c *Config) GetXTLSConfig(opts ...Option) *xtls.Config {
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root, err := c.getCertPool()
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if err != nil {
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newError("failed to load system root certificate").AtError().Base(err).WriteToLog()
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}
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if c == nil {
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return &xtls.Config{
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ClientSessionCache: globalSessionCache,
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RootCAs: root,
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InsecureSkipVerify: false,
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NextProtos: nil,
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SessionTicketsDisabled: true,
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}
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}
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config := &xtls.Config{
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ClientSessionCache: globalSessionCache,
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RootCAs: root,
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InsecureSkipVerify: c.AllowInsecure,
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NextProtos: c.NextProtocol,
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SessionTicketsDisabled: !c.EnableSessionResumption,
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VerifyPeerCertificate: c.verifyPeerCert,
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}
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for _, opt := range opts {
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opt(config)
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}
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caCerts := c.getCustomCA()
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if len(caCerts) > 0 {
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config.GetCertificate = getGetCertificateFunc(config, caCerts)
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} else {
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config.GetCertificate = getNewGetCertificateFunc(c.BuildCertificates(), c.RejectUnknownSni)
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}
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if sn := c.parseServerName(); len(sn) > 0 {
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config.ServerName = sn
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}
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if len(config.NextProtos) == 0 {
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config.NextProtos = []string{"h2", "http/1.1"}
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}
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switch c.MinVersion {
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case "1.0":
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config.MinVersion = xtls.VersionTLS10
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case "1.1":
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config.MinVersion = xtls.VersionTLS11
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case "1.2":
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config.MinVersion = xtls.VersionTLS12
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case "1.3":
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config.MinVersion = xtls.VersionTLS13
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}
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switch c.MaxVersion {
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case "1.0":
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config.MaxVersion = xtls.VersionTLS10
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case "1.1":
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config.MaxVersion = xtls.VersionTLS11
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case "1.2":
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config.MaxVersion = xtls.VersionTLS12
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case "1.3":
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config.MaxVersion = xtls.VersionTLS13
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}
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if len(c.CipherSuites) > 0 {
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id := make(map[string]uint16)
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for _, s := range xtls.CipherSuites() {
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id[s.Name] = s.ID
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}
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for _, n := range strings.Split(c.CipherSuites, ":") {
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if id[n] != 0 {
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config.CipherSuites = append(config.CipherSuites, id[n])
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}
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}
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}
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config.PreferServerCipherSuites = c.PreferServerCipherSuites
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return config
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}
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// Option for building XTLS config.
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type Option func(*xtls.Config)
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// WithDestination sets the server name in XTLS config.
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func WithDestination(dest net.Destination) Option {
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return func(config *xtls.Config) {
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if dest.Address.Family().IsDomain() && config.ServerName == "" {
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config.ServerName = dest.Address.Domain()
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}
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}
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}
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// WithNextProto sets the ALPN values in XTLS config.
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func WithNextProto(protocol ...string) Option {
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return func(config *xtls.Config) {
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if len(config.NextProtos) == 0 {
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config.NextProtos = protocol
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}
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}
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}
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// ConfigFromStreamSettings fetches Config from stream settings. Nil if not found.
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func ConfigFromStreamSettings(settings *internet.MemoryStreamConfig) *Config {
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if settings == nil {
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return nil
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}
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config, ok := settings.SecuritySettings.(*Config)
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if !ok {
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return nil
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}
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return config
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}
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