forked from TrueCloudLab/lego
133 lines
3.1 KiB
Go
133 lines
3.1 KiB
Go
package acme
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
type httpChallenge struct {
|
|
jws *jws
|
|
optPort string
|
|
start chan net.Listener
|
|
end chan error
|
|
}
|
|
|
|
func (s *httpChallenge) Solve(chlng challenge, domain string) error {
|
|
|
|
logf("[INFO] acme: Trying to solve HTTP-01")
|
|
|
|
s.start = make(chan net.Listener)
|
|
s.end = make(chan error)
|
|
|
|
// Generate the Key Authorization for the challenge
|
|
keyAuth, err := getKeyAuthorization(chlng.Token, &s.jws.privKey.PublicKey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
go s.startHTTPServer(domain, chlng.Token, keyAuth)
|
|
var listener net.Listener
|
|
select {
|
|
case listener = <-s.start:
|
|
break
|
|
case err := <-s.end:
|
|
return fmt.Errorf("Could not start HTTP server for challenge -> %v", err)
|
|
}
|
|
|
|
// Make sure we properly close the HTTP server before we return
|
|
defer func() {
|
|
listener.Close()
|
|
err = <-s.end
|
|
close(s.start)
|
|
close(s.end)
|
|
}()
|
|
|
|
jsonBytes, err := json.Marshal(challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
|
|
if err != nil {
|
|
return errors.New("Failed to marshal network message...")
|
|
}
|
|
|
|
// Tell the server we handle HTTP-01
|
|
resp, err := s.jws.post(chlng.URI, jsonBytes)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to post JWS message. -> %v", err)
|
|
}
|
|
|
|
// After the path is sent, the ACME server will access our server.
|
|
// Repeatedly check the server for an updated status on our request.
|
|
var challengeResponse challenge
|
|
Loop:
|
|
for {
|
|
if resp.StatusCode >= http.StatusBadRequest {
|
|
return handleHTTPError(resp)
|
|
}
|
|
|
|
err = json.NewDecoder(resp.Body).Decode(&challengeResponse)
|
|
resp.Body.Close()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
switch challengeResponse.Status {
|
|
case "valid":
|
|
logf("The server validated our request")
|
|
break Loop
|
|
case "pending":
|
|
break
|
|
case "invalid":
|
|
return handleChallengeError(challengeResponse)
|
|
default:
|
|
return errors.New("The server returned an unexpected state.")
|
|
}
|
|
|
|
time.Sleep(1 * time.Second)
|
|
resp, err = http.Get(chlng.URI)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *httpChallenge) startHTTPServer(domain string, token string, keyAuth string) {
|
|
|
|
// Allow for CLI port override
|
|
port := ":80"
|
|
if s.optPort != "" {
|
|
port = ":" + s.optPort
|
|
}
|
|
|
|
listener, err := net.Listen("tcp", domain+port)
|
|
if err != nil {
|
|
// if the domain:port bind failed, fall back to :port bind and try that instead.
|
|
listener, err = net.Listen("tcp", port)
|
|
if err != nil {
|
|
s.end <- err
|
|
}
|
|
}
|
|
// Signal successfull start
|
|
s.start <- listener
|
|
|
|
path := "/.well-known/acme-challenge/" + token
|
|
|
|
// The handler validates the HOST header and request type.
|
|
// For validation it then writes the token the server returned with the challenge
|
|
http.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
|
|
if strings.HasPrefix(r.Host, domain) && r.Method == "GET" {
|
|
w.Header().Add("Content-Type", "text/plain")
|
|
w.Write([]byte(keyAuth))
|
|
logf("[INFO] Served key authentication")
|
|
} else {
|
|
logf("[INFO] Received request for domain %s with method %s", r.Host, r.Method)
|
|
w.Write([]byte("TEST"))
|
|
}
|
|
})
|
|
|
|
http.Serve(listener, nil)
|
|
|
|
// Signal that the server was shut down
|
|
s.end <- nil
|
|
}
|