131 lines
3 KiB
Go
131 lines
3 KiB
Go
package server
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import (
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// We must import sha512 so that it registers with the runtime so that
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// certificates that use it can be parsed.
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_ "crypto/sha512"
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"crypto/tls"
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"fmt"
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"io"
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"net"
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"strconv"
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"sync"
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)
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// ListenerFactory is the factory function to create a listener.
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type ListenerFactory func(map[string]string, io.Writer) (net.Listener, map[string]string, ReloadFunc, error)
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// BuiltinListeners is the list of built-in listener types.
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var BuiltinListeners = map[string]ListenerFactory{
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"tcp": tcpListenerFactory,
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"atlas": atlasListenerFactory,
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}
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// tlsLookup maps the tls_min_version configuration to the internal value
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var tlsLookup = map[string]uint16{
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"tls10": tls.VersionTLS10,
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"tls11": tls.VersionTLS11,
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"tls12": tls.VersionTLS12,
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}
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// NewListener creates a new listener of the given type with the given
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// configuration. The type is looked up in the BuiltinListeners map.
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func NewListener(t string, config map[string]string, logger io.Writer) (net.Listener, map[string]string, ReloadFunc, error) {
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f, ok := BuiltinListeners[t]
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if !ok {
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return nil, nil, nil, fmt.Errorf("unknown listener type: %s", t)
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}
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return f(config, logger)
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}
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func listenerWrapTLS(
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ln net.Listener,
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props map[string]string,
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config map[string]string) (net.Listener, map[string]string, ReloadFunc, error) {
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props["tls"] = "disabled"
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if v, ok := config["tls_disable"]; ok {
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disabled, err := strconv.ParseBool(v)
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if err != nil {
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return nil, nil, nil, fmt.Errorf("invalid value for 'tls_disable': %v", err)
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}
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if disabled {
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return ln, props, nil, nil
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}
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}
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_, ok := config["tls_cert_file"]
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if !ok {
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return nil, nil, nil, fmt.Errorf("'tls_cert_file' must be set")
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}
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_, ok = config["tls_key_file"]
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if !ok {
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return nil, nil, nil, fmt.Errorf("'tls_key_file' must be set")
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}
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cg := &certificateGetter{
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id: config["address"],
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}
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if err := cg.reload(config); err != nil {
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return nil, nil, nil, fmt.Errorf("error loading TLS cert: %s", err)
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}
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tlsvers, ok := config["tls_min_version"]
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if !ok {
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tlsvers = "tls12"
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}
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tlsConf := &tls.Config{}
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tlsConf.GetCertificate = cg.getCertificate
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tlsConf.NextProtos = []string{"http/1.1"}
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tlsConf.MinVersion, ok = tlsLookup[tlsvers]
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if !ok {
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return nil, nil, nil, fmt.Errorf("'tls_min_version' value %s not supported, please specify one of [tls10,tls11,tls12]", tlsvers)
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}
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tlsConf.ClientAuth = tls.RequestClientCert
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ln = tls.NewListener(ln, tlsConf)
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props["tls"] = "enabled"
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return ln, props, cg.reload, nil
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}
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type certificateGetter struct {
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sync.RWMutex
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cert *tls.Certificate
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id string
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}
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func (cg *certificateGetter) reload(config map[string]string) error {
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if config["address"] != cg.id {
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return nil
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}
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cert, err := tls.LoadX509KeyPair(config["tls_cert_file"], config["tls_key_file"])
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if err != nil {
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return err
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}
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cg.Lock()
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defer cg.Unlock()
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cg.cert = &cert
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return nil
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}
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func (cg *certificateGetter) getCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
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cg.RLock()
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defer cg.RUnlock()
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if cg.cert == nil {
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return nil, fmt.Errorf("nil certificate")
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}
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return cg.cert, nil
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}
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