forked from go-acme/lego
-
Notifications
You must be signed in to change notification settings - Fork 1
/
namecheap.go
260 lines (222 loc) · 7.01 KB
/
namecheap.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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
// Package namecheap implements a DNS provider for solving the DNS-01 challenge using namecheap DNS.
package namecheap
import (
"errors"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"strings"
"time"
"github.com/go-acme/lego/challenge/dns01"
"github.com/go-acme/lego/log"
"github.com/go-acme/lego/platform/config/env"
)
// Notes about namecheap's tool API:
// 1. Using the API requires registration. Once registered, use your account
// name and API key to access the API.
// 2. There is no API to add or modify a single DNS record. Instead you must
// read the entire list of records, make modifications, and then write the
// entire updated list of records. (Yuck.)
// 3. Namecheap's DNS updates can be slow to propagate. I've seen them take
// as long as an hour.
// 4. Namecheap requires you to whitelist the IP address from which you call
// its APIs. It also requires all API calls to include the whitelisted IP
// address as a form or query string value. This code uses a namecheap
// service to query the client's IP address.
const (
defaultBaseURL = "https://api.namecheap.com/xml.response"
getIPURL = "https://dynamicdns.park-your-domain.com/getip"
)
// A challenge represents all the data needed to specify a dns-01 challenge
// to lets-encrypt.
type challenge struct {
domain string
key string
keyFqdn string
keyValue string
tld string
sld string
host string
}
// Config is used to configure the creation of the DNSProvider
type Config struct {
Debug bool
BaseURL string
APIUser string
APIKey string
ClientIP string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
BaseURL: defaultBaseURL,
Debug: env.GetOrDefaultBool("NAMECHEAP_DEBUG", false),
TTL: env.GetOrDefaultInt("NAMECHEAP_TTL", dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond("NAMECHEAP_PROPAGATION_TIMEOUT", 60*time.Minute),
PollingInterval: env.GetOrDefaultSecond("NAMECHEAP_POLLING_INTERVAL", 15*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("NAMECHEAP_HTTP_TIMEOUT", 60*time.Second),
},
}
}
// DNSProvider is an implementation of the ChallengeProviderTimeout interface
// that uses Namecheap's tool API to manage TXT records for a domain.
type DNSProvider struct {
config *Config
}
// NewDNSProvider returns a DNSProvider instance configured for namecheap.
// Credentials must be passed in the environment variables:
// NAMECHEAP_API_USER and NAMECHEAP_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("NAMECHEAP_API_USER", "NAMECHEAP_API_KEY")
if err != nil {
return nil, fmt.Errorf("namecheap: %v", err)
}
config := NewDefaultConfig()
config.APIUser = values["NAMECHEAP_API_USER"]
config.APIKey = values["NAMECHEAP_API_KEY"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for namecheap.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("namecheap: the configuration of the DNS provider is nil")
}
if config.APIUser == "" || config.APIKey == "" {
return nil, fmt.Errorf("namecheap: credentials missing")
}
if len(config.ClientIP) == 0 {
clientIP, err := getClientIP(config.HTTPClient, config.Debug)
if err != nil {
return nil, fmt.Errorf("namecheap: %v", err)
}
config.ClientIP = clientIP
}
return &DNSProvider{config: config}, nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Namecheap can sometimes take a long time to complete an update, so wait up to 60 minutes for the update to propagate.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}
// Present installs a TXT record for the DNS challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
tlds, err := d.getTLDs()
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
ch, err := newChallenge(domain, keyAuth, tlds)
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
records, err := d.getHosts(ch.sld, ch.tld)
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
record := Record{
Name: ch.key,
Type: "TXT",
Address: ch.keyValue,
MXPref: "10",
TTL: strconv.Itoa(d.config.TTL),
}
records = append(records, record)
if d.config.Debug {
for _, h := range records {
log.Printf("%-5.5s %-30.30s %-6s %-70.70s", h.Type, h.Name, h.TTL, h.Address)
}
}
err = d.setHosts(ch.sld, ch.tld, records)
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
return nil
}
// CleanUp removes a TXT record used for a previous DNS challenge.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
tlds, err := d.getTLDs()
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
ch, err := newChallenge(domain, keyAuth, tlds)
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
records, err := d.getHosts(ch.sld, ch.tld)
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
// Find the challenge TXT record and remove it if found.
var found bool
var newRecords []Record
for _, h := range records {
if h.Name == ch.key && h.Type == "TXT" {
found = true
} else {
newRecords = append(newRecords, h)
}
}
if !found {
return nil
}
err = d.setHosts(ch.sld, ch.tld, newRecords)
if err != nil {
return fmt.Errorf("namecheap: %v", err)
}
return nil
}
// getClientIP returns the client's public IP address.
// It uses namecheap's IP discovery service to perform the lookup.
func getClientIP(client *http.Client, debug bool) (addr string, err error) {
resp, err := client.Get(getIPURL)
if err != nil {
return "", err
}
defer resp.Body.Close()
clientIP, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
if debug {
log.Println("Client IP:", string(clientIP))
}
return string(clientIP), nil
}
// newChallenge builds a challenge record from a domain name, a challenge
// authentication key, and a map of available TLDs.
func newChallenge(domain, keyAuth string, tlds map[string]string) (*challenge, error) {
domain = dns01.UnFqdn(domain)
parts := strings.Split(domain, ".")
// Find the longest matching TLD.
longest := -1
for i := len(parts); i > 0; i-- {
t := strings.Join(parts[i-1:], ".")
if _, found := tlds[t]; found {
longest = i - 1
}
}
if longest < 1 {
return nil, fmt.Errorf("invalid domain name %q", domain)
}
tld := strings.Join(parts[longest:], ".")
sld := parts[longest-1]
var host string
if longest >= 1 {
host = strings.Join(parts[:longest-1], ".")
}
fqdn, value := dns01.GetRecord(domain, keyAuth)
return &challenge{
domain: domain,
key: "_acme-challenge." + host,
keyFqdn: fqdn,
keyValue: value,
tld: tld,
sld: sld,
host: host,
}, nil
}