forked from TrueCloudLab/lego
122 lines
4 KiB
Go
122 lines
4 KiB
Go
package http01
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"net/http"
|
|
"net/textproto"
|
|
"strings"
|
|
|
|
"github.com/go-acme/lego/v3/log"
|
|
)
|
|
|
|
// ProviderServer implements ChallengeProvider for `http-01` challenge.
|
|
// It may be instantiated without using the NewProviderServer function if
|
|
// you want only to use the default values.
|
|
type ProviderServer struct {
|
|
iface string
|
|
port string
|
|
matcher domainMatcher
|
|
done chan bool
|
|
listener net.Listener
|
|
}
|
|
|
|
// NewProviderServer creates a new ProviderServer on the selected interface and port.
|
|
// Setting iface and / or port to an empty string will make the server fall back to
|
|
// the "any" interface and port 80 respectively.
|
|
func NewProviderServer(iface, port string) *ProviderServer {
|
|
if port == "" {
|
|
port = "80"
|
|
}
|
|
|
|
return &ProviderServer{iface: iface, port: port, matcher: &hostMatcher{}}
|
|
}
|
|
|
|
// Present starts a web server and makes the token available at `ChallengePath(token)` for web requests.
|
|
func (s *ProviderServer) Present(domain, token, keyAuth string) error {
|
|
var err error
|
|
s.listener, err = net.Listen("tcp", s.GetAddress())
|
|
if err != nil {
|
|
return fmt.Errorf("could not start HTTP server for challenge: %w", err)
|
|
}
|
|
|
|
s.done = make(chan bool)
|
|
go s.serve(domain, token, keyAuth)
|
|
return nil
|
|
}
|
|
|
|
func (s *ProviderServer) GetAddress() string {
|
|
return net.JoinHostPort(s.iface, s.port)
|
|
}
|
|
|
|
// CleanUp closes the HTTP server and removes the token from `ChallengePath(token)`.
|
|
func (s *ProviderServer) CleanUp(domain, token, keyAuth string) error {
|
|
if s.listener == nil {
|
|
return nil
|
|
}
|
|
s.listener.Close()
|
|
<-s.done
|
|
return nil
|
|
}
|
|
|
|
// SetProxyHeader changes the validation of incoming requests.
|
|
// By default, s matches the "Host" header value to the domain name.
|
|
//
|
|
// When the server runs behind a proxy server, this is not the correct place to look at;
|
|
// Apache and NGINX have traditionally moved the original Host header into a new header named "X-Forwarded-Host".
|
|
// Other webservers might use different names;
|
|
// and RFC7239 has standardized a new header named "Forwarded" (with slightly different semantics).
|
|
//
|
|
// The exact behavior depends on the value of headerName:
|
|
// - "" (the empty string) and "Host" will restore the default and only check the Host header
|
|
// - "Forwarded" will look for a Forwarded header, and inspect it according to https://tools.ietf.org/html/rfc7239
|
|
// - any other value will check the header value with the same name.
|
|
func (s *ProviderServer) SetProxyHeader(headerName string) {
|
|
switch h := textproto.CanonicalMIMEHeaderKey(headerName); h {
|
|
case "", "Host":
|
|
s.matcher = &hostMatcher{}
|
|
case "Forwarded":
|
|
s.matcher = &forwardedMatcher{}
|
|
default:
|
|
s.matcher = arbitraryMatcher(h)
|
|
}
|
|
}
|
|
|
|
func (s *ProviderServer) serve(domain, token, keyAuth string) {
|
|
path := ChallengePath(token)
|
|
|
|
// The incoming request must will be validated to prevent DNS rebind attacks.
|
|
// We only respond with the keyAuth, when we're receiving a GET requests with
|
|
// the "Host" header matching the domain (the latter is configurable though SetProxyHeader).
|
|
mux := http.NewServeMux()
|
|
mux.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
|
|
if r.Method == http.MethodGet && s.matcher.matches(r, domain) {
|
|
w.Header().Add("Content-Type", "text/plain")
|
|
_, err := w.Write([]byte(keyAuth))
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
log.Infof("[%s] Served key authentication", domain)
|
|
} else {
|
|
log.Warnf("Received request for domain %s with method %s but the domain did not match any challenge. Please ensure your are passing the %s header properly.", r.Host, r.Method, s.matcher.name())
|
|
_, err := w.Write([]byte("TEST"))
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
}
|
|
})
|
|
|
|
httpServer := &http.Server{Handler: mux}
|
|
|
|
// Once httpServer is shut down
|
|
// we don't want any lingering connections, so disable KeepAlives.
|
|
httpServer.SetKeepAlivesEnabled(false)
|
|
|
|
err := httpServer.Serve(s.listener)
|
|
if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
|
|
log.Println(err)
|
|
}
|
|
s.done <- true
|
|
}
|