258 lines
7 KiB
Go
258 lines
7 KiB
Go
// Package namecheap implements a DNS provider for solving the DNS-01 challenge using namecheap DNS.
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package namecheap
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/xenolf/lego/challenge/dns01"
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"github.com/xenolf/lego/log"
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"github.com/xenolf/lego/platform/config/env"
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)
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// Notes about namecheap's tool API:
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// 1. Using the API requires registration. Once registered, use your account
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// name and API key to access the API.
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// 2. There is no API to add or modify a single DNS record. Instead you must
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// read the entire list of records, make modifications, and then write the
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// entire updated list of records. (Yuck.)
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// 3. Namecheap's DNS updates can be slow to propagate. I've seen them take
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// as long as an hour.
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// 4. Namecheap requires you to whitelist the IP address from which you call
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// its APIs. It also requires all API calls to include the whitelisted IP
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// address as a form or query string value. This code uses a namecheap
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// service to query the client's IP address.
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const (
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defaultBaseURL = "https://api.namecheap.com/xml.response"
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getIPURL = "https://dynamicdns.park-your-domain.com/getip"
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)
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// A challenge represents all the data needed to specify a dns-01 challenge
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// to lets-encrypt.
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type challenge struct {
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domain string
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key string
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keyFqdn string
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keyValue string
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tld string
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sld string
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host string
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}
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// Config is used to configure the creation of the DNSProvider
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type Config struct {
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Debug bool
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BaseURL string
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APIUser string
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APIKey string
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ClientIP string
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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TTL int
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HTTPClient *http.Client
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}
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// NewDefaultConfig returns a default configuration for the DNSProvider
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func NewDefaultConfig() *Config {
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return &Config{
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BaseURL: defaultBaseURL,
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Debug: env.GetOrDefaultBool("NAMECHEAP_DEBUG", false),
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TTL: env.GetOrDefaultInt("NAMECHEAP_TTL", dns01.DefaultTTL),
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PropagationTimeout: env.GetOrDefaultSecond("NAMECHEAP_PROPAGATION_TIMEOUT", 60*time.Minute),
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PollingInterval: env.GetOrDefaultSecond("NAMECHEAP_POLLING_INTERVAL", 15*time.Second),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond("NAMECHEAP_HTTP_TIMEOUT", 60*time.Second),
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},
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}
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}
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// DNSProvider is an implementation of the ChallengeProviderTimeout interface
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// that uses Namecheap's tool API to manage TXT records for a domain.
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type DNSProvider struct {
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config *Config
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}
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// NewDNSProvider returns a DNSProvider instance configured for namecheap.
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// Credentials must be passed in the environment variables:
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// NAMECHEAP_API_USER and NAMECHEAP_API_KEY.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get("NAMECHEAP_API_USER", "NAMECHEAP_API_KEY")
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if err != nil {
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return nil, fmt.Errorf("namecheap: %v", err)
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}
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config := NewDefaultConfig()
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config.APIUser = values["NAMECHEAP_API_USER"]
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config.APIKey = values["NAMECHEAP_API_KEY"]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for namecheap.
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func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
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if config == nil {
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return nil, errors.New("namecheap: the configuration of the DNS provider is nil")
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}
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if config.APIUser == "" || config.APIKey == "" {
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return nil, fmt.Errorf("namecheap: credentials missing")
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}
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if len(config.ClientIP) == 0 {
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clientIP, err := getClientIP(config.HTTPClient, config.Debug)
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if err != nil {
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return nil, fmt.Errorf("namecheap: %v", err)
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}
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config.ClientIP = clientIP
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}
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return &DNSProvider{config: config}, nil
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}
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// Timeout returns the timeout and interval to use when checking for DNS propagation.
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// Namecheap can sometimes take a long time to complete an update, so wait up to 60 minutes for the update to propagate.
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func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
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return d.config.PropagationTimeout, d.config.PollingInterval
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}
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// Present installs a TXT record for the DNS challenge.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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tlds, err := d.getTLDs()
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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ch, err := newChallenge(domain, keyAuth, tlds)
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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records, err := d.getHosts(ch.sld, ch.tld)
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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record := Record{
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Name: ch.key,
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Type: "TXT",
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Address: ch.keyValue,
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MXPref: "10",
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TTL: strconv.Itoa(d.config.TTL),
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}
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records = append(records, record)
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if d.config.Debug {
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for _, h := range records {
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log.Printf("%-5.5s %-30.30s %-6s %-70.70s", h.Type, h.Name, h.TTL, h.Address)
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}
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}
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err = d.setHosts(ch.sld, ch.tld, records)
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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return nil
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}
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// CleanUp removes a TXT record used for a previous DNS challenge.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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tlds, err := d.getTLDs()
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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ch, err := newChallenge(domain, keyAuth, tlds)
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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records, err := d.getHosts(ch.sld, ch.tld)
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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// Find the challenge TXT record and remove it if found.
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var found bool
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for i, h := range records {
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if h.Name == ch.key && h.Type == "TXT" {
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records = append(records[:i], records[i+1:]...)
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found = true
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}
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}
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if !found {
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return nil
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}
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err = d.setHosts(ch.sld, ch.tld, records)
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if err != nil {
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return fmt.Errorf("namecheap: %v", err)
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}
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return nil
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}
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// getClientIP returns the client's public IP address.
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// It uses namecheap's IP discovery service to perform the lookup.
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func getClientIP(client *http.Client, debug bool) (addr string, err error) {
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resp, err := client.Get(getIPURL)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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clientIP, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return "", err
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}
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if debug {
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log.Println("Client IP:", string(clientIP))
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}
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return string(clientIP), nil
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}
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// newChallenge builds a challenge record from a domain name, a challenge
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// authentication key, and a map of available TLDs.
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func newChallenge(domain, keyAuth string, tlds map[string]string) (*challenge, error) {
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domain = dns01.UnFqdn(domain)
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parts := strings.Split(domain, ".")
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// Find the longest matching TLD.
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longest := -1
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for i := len(parts); i > 0; i-- {
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t := strings.Join(parts[i-1:], ".")
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if _, found := tlds[t]; found {
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longest = i - 1
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}
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}
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if longest < 1 {
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return nil, fmt.Errorf("invalid domain name %q", domain)
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}
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tld := strings.Join(parts[longest:], ".")
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sld := parts[longest-1]
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var host string
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if longest >= 1 {
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host = strings.Join(parts[:longest-1], ".")
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}
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fqdn, value := dns01.GetRecord(domain, keyAuth)
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return &challenge{
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domain: domain,
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key: "_acme-challenge." + host,
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keyFqdn: fqdn,
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keyValue: value,
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tld: tld,
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sld: sld,
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host: host,
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}, nil
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}
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