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97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
package tlsalpn01
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import (
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"crypto/tls"
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"errors"
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"fmt"
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"net"
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"net/http"
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"strings"
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"github.com/go-acme/lego/v4/log"
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)
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const (
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// ACMETLS1Protocol is the ALPN Protocol ID for the ACME-TLS/1 Protocol.
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ACMETLS1Protocol = "acme-tls/1"
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// defaultTLSPort is the port that the ProviderServer will default to
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// when no other port is provided.
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defaultTLSPort = "443"
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)
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// ProviderServer implements ChallengeProvider for `TLS-ALPN-01` challenge.
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// It may be instantiated without using the NewProviderServer
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// if you want only to use the default values.
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type ProviderServer struct {
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iface string
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port string
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listener net.Listener
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}
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// NewProviderServer creates a new ProviderServer on the selected interface and port.
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// Setting iface and / or port to an empty string will make the server fall back to
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// the "any" interface and port 443 respectively.
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func NewProviderServer(iface, port string) *ProviderServer {
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return &ProviderServer{iface: iface, port: port}
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}
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func (s *ProviderServer) GetAddress() string {
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return net.JoinHostPort(s.iface, s.port)
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}
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// Present generates a certificate with an SHA-256 digest of the keyAuth provided
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// as the acmeValidation-v1 extension value to conform to the ACME-TLS-ALPN spec.
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func (s *ProviderServer) Present(domain, token, keyAuth string) error {
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if s.port == "" {
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// Fallback to port 443 if the port was not provided.
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s.port = defaultTLSPort
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}
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// Generate the challenge certificate using the provided keyAuth and domain.
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cert, err := ChallengeCert(domain, keyAuth)
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if err != nil {
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return err
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}
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// Place the generated certificate with the extension into the TLS config
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// so that it can serve the correct details.
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tlsConf := new(tls.Config)
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tlsConf.Certificates = []tls.Certificate{*cert}
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// We must set that the `acme-tls/1` application level protocol is supported
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// so that the protocol negotiation can succeed. Reference:
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// https://www.rfc-editor.org/rfc/rfc8737.html#section-6.2
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tlsConf.NextProtos = []string{ACMETLS1Protocol}
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// Create the listener with the created tls.Config.
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s.listener, err = tls.Listen("tcp", s.GetAddress(), tlsConf)
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if err != nil {
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return fmt.Errorf("could not start HTTPS server for challenge: %w", err)
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}
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// Shut the server down when we're finished.
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go func() {
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err := http.Serve(s.listener, nil)
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if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
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log.Println(err)
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}
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}()
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return nil
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}
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// CleanUp closes the HTTPS server.
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func (s *ProviderServer) CleanUp(domain, token, keyAuth string) error {
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if s.listener == nil {
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return nil
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}
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// Server was created, close it.
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if err := s.listener.Close(); err != nil && errors.Is(err, http.ErrServerClosed) {
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return err
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}
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return nil
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}
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