forked from go-acme/lego
/
simple_http_challenge.go
165 lines (141 loc) · 4.45 KB
/
simple_http_challenge.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
package acme
import (
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"net"
"net/http"
"strings"
"time"
)
// OnSimpleHTTPStart hook will get called BEFORE SimpleHTTP starts to listen on a port.
var OnSimpleHTTPStart func(string)
// OnSimpleHTTPEnd hook will get called AFTER SimpleHTTP determined the status of the domain.
var OnSimpleHTTPEnd func(bool)
type simpleHTTPChallenge struct {
jws *jws
optPort string
}
func (s *simpleHTTPChallenge) Solve(chlng challenge, domain string) error {
logf("Trying to solve SimpleHTTP")
// Generate random string for the path. The acme server will
// access this path on the server in order to validate the request
listener, err := s.startHTTPSServer(domain, chlng.Token)
if err != nil {
return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
}
defer listener.Close()
// Tell the server about the generated random path
jsonBytes, err := json.Marshal(challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token})
if err != nil {
return errors.New("Failed to marshal network message...")
}
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":
if OnSimpleHTTPEnd != nil {
OnSimpleHTTPEnd(true)
}
logf("The server validated our request")
break Loop
case "pending":
break
case "invalid":
if OnSimpleHTTPEnd != nil {
OnSimpleHTTPEnd(false)
}
return errors.New("The server could not validate our request.")
default:
return errors.New("The server returned an unexpected state.")
}
time.Sleep(1 * time.Second)
resp, err = http.Get(chlng.URI)
}
return nil
}
// Starts a temporary HTTPS server on port 443. As soon as the challenge passed validation,
// this server will get shut down. The certificate generated here is only held in memory.
func (s *simpleHTTPChallenge) startHTTPSServer(domain string, token string) (net.Listener, error) {
// Generate a new RSA key and a self-signed certificate.
tempPrivKey, err := generatePrivateKey(rsakey, 2048)
rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
if err != nil {
return nil, err
}
tempCertPEM, err := generatePemCert(rsaPrivKey, domain)
if err != nil {
return nil, err
}
pemBytes := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(rsaPrivKey)})
tempKeyPair, err := tls.X509KeyPair(
tempCertPEM,
pemBytes)
if err != nil {
return nil, err
}
tlsConf := new(tls.Config)
tlsConf.Certificates = []tls.Certificate{tempKeyPair}
path := "/.well-known/acme-challenge/" + token
if OnSimpleHTTPStart != nil {
OnSimpleHTTPStart(path)
}
// Allow for CLI override
port := ":443"
if s.optPort != "" {
port = ":" + s.optPort
}
tlsListener, err := tls.Listen("tcp", domain+port, tlsConf)
if err != nil {
// if the domain:port bind failed, fall back to :port bind and try that instead.
tlsListener, err = tls.Listen("tcp", port, tlsConf)
if err != nil {
return nil, err
}
}
jsonBytes, err := json.Marshal(challenge{Type: "simpleHttp", Token: token, TLS: true})
if err != nil {
return nil, errors.New("startHTTPSServer: Failed to marshal network message")
}
signed, err := s.jws.signContent(jsonBytes)
if err != nil {
return nil, fmt.Errorf("startHTTPSServer: Failed to sign message. %s", err)
}
signedCompact := signed.FullSerialize()
if err != nil {
return nil, errors.New("startHTTPSServer: Failed to serialize message")
}
// 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", "application/jose+json")
w.Write([]byte(signedCompact))
logf("Served JWS payload...")
} else {
logf("Received request for domain %s with method %s", r.Host, r.Method)
w.Write([]byte("TEST"))
}
})
go http.Serve(tlsListener, nil)
return tlsListener, nil
}