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lego/providers/dns/pdns/pdns.go
Ludovic Fernandez c4bbb4b819
Review DNS providers. (#565)
* refactor: review DNS providers.
2018-06-11 17:32:50 +02:00

338 lines
7.1 KiB
Go

// Package pdns implements a DNS provider for solving the DNS-01
// challenge using PowerDNS nameserver.
package pdns
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/platform/config/env"
)
// DNSProvider is an implementation of the acme.ChallengeProvider interface
type DNSProvider struct {
apiKey string
host *url.URL
apiVersion int
}
// NewDNSProvider returns a DNSProvider instance configured for pdns.
// Credentials must be passed in the environment variable:
// PDNS_API_URL and PDNS_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("PDNS_API_KEY", "PDNS_API_URL")
if err != nil {
return nil, fmt.Errorf("PDNS: %v", err)
}
hostURL, err := url.Parse(values["PDNS_API_URL"])
if err != nil {
return nil, fmt.Errorf("PDNS: %v", err)
}
return NewDNSProviderCredentials(hostURL, values["PDNS_API_KEY"])
}
// NewDNSProviderCredentials uses the supplied credentials to return a
// DNSProvider instance configured for pdns.
func NewDNSProviderCredentials(host *url.URL, key string) (*DNSProvider, error) {
if key == "" {
return nil, fmt.Errorf("PDNS API key missing")
}
if host == nil || host.Host == "" {
return nil, fmt.Errorf("PDNS API URL missing")
}
provider := &DNSProvider{
host: host,
apiKey: key,
}
provider.getAPIVersion()
return provider, nil
}
// Timeout returns the timeout and interval to use when checking for DNS
// propagation. Adjusting here to cope with spikes in propagation times.
func (c *DNSProvider) Timeout() (timeout, interval time.Duration) {
return 120 * time.Second, 2 * time.Second
}
// Present creates a TXT record to fulfil the dns-01 challenge
func (c *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
zone, err := c.getHostedZone(fqdn)
if err != nil {
return err
}
name := fqdn
// pre-v1 API wants non-fqdn
if c.apiVersion == 0 {
name = acme.UnFqdn(fqdn)
}
rec := pdnsRecord{
Content: "\"" + value + "\"",
Disabled: false,
// pre-v1 API
Type: "TXT",
Name: name,
TTL: 120,
}
rrsets := rrSets{
RRSets: []rrSet{
{
Name: name,
ChangeType: "REPLACE",
Type: "TXT",
Kind: "Master",
TTL: 120,
Records: []pdnsRecord{rec},
},
},
}
body, err := json.Marshal(rrsets)
if err != nil {
return err
}
_, err = c.makeRequest("PATCH", zone.URL, bytes.NewReader(body))
return err
}
// CleanUp removes the TXT record matching the specified parameters
func (c *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
zone, err := c.getHostedZone(fqdn)
if err != nil {
return err
}
set, err := c.findTxtRecord(fqdn)
if err != nil {
return err
}
rrsets := rrSets{
RRSets: []rrSet{
{
Name: set.Name,
Type: set.Type,
ChangeType: "DELETE",
},
},
}
body, err := json.Marshal(rrsets)
if err != nil {
return err
}
_, err = c.makeRequest("PATCH", zone.URL, bytes.NewReader(body))
return err
}
func (c *DNSProvider) getHostedZone(fqdn string) (*hostedZone, error) {
var zone hostedZone
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return nil, err
}
url := "/servers/localhost/zones"
result, err := c.makeRequest("GET", url, nil)
if err != nil {
return nil, err
}
zones := []hostedZone{}
err = json.Unmarshal(result, &zones)
if err != nil {
return nil, err
}
url = ""
for _, zone := range zones {
if acme.UnFqdn(zone.Name) == acme.UnFqdn(authZone) {
url = zone.URL
}
}
result, err = c.makeRequest("GET", url, nil)
if err != nil {
return nil, err
}
err = json.Unmarshal(result, &zone)
if err != nil {
return nil, err
}
// convert pre-v1 API result
if len(zone.Records) > 0 {
zone.RRSets = []rrSet{}
for _, record := range zone.Records {
set := rrSet{
Name: record.Name,
Type: record.Type,
Records: []pdnsRecord{record},
}
zone.RRSets = append(zone.RRSets, set)
}
}
return &zone, nil
}
func (c *DNSProvider) findTxtRecord(fqdn string) (*rrSet, error) {
zone, err := c.getHostedZone(fqdn)
if err != nil {
return nil, err
}
_, err = c.makeRequest("GET", zone.URL, nil)
if err != nil {
return nil, err
}
for _, set := range zone.RRSets {
if (set.Name == acme.UnFqdn(fqdn) || set.Name == fqdn) && set.Type == "TXT" {
return &set, nil
}
}
return nil, fmt.Errorf("no existing record found for %s", fqdn)
}
func (c *DNSProvider) getAPIVersion() {
type APIVersion struct {
URL string `json:"url"`
Version int `json:"version"`
}
result, err := c.makeRequest("GET", "/api", nil)
if err != nil {
return
}
var versions []APIVersion
err = json.Unmarshal(result, &versions)
if err != nil {
return
}
latestVersion := 0
for _, v := range versions {
if v.Version > latestVersion {
latestVersion = v.Version
}
}
c.apiVersion = latestVersion
}
func (c *DNSProvider) makeRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
type APIError struct {
Error string `json:"error"`
}
var path = ""
if c.host.Path != "/" {
path = c.host.Path
}
if !strings.HasPrefix(uri, "/") {
uri = "/" + uri
}
if c.apiVersion > 0 && !strings.HasPrefix(uri, "/api/v") {
uri = "/api/v" + strconv.Itoa(c.apiVersion) + uri
}
url := c.host.Scheme + "://" + c.host.Host + path + uri
req, err := http.NewRequest(method, url, body)
if err != nil {
return nil, err
}
req.Header.Set("X-API-Key", c.apiKey)
client := http.Client{Timeout: 30 * time.Second}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("Error talking to PDNS API -> %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != 422 && (resp.StatusCode < 200 || resp.StatusCode >= 300) {
return nil, fmt.Errorf("Unexpected HTTP status code %d when fetching '%s'", resp.StatusCode, url)
}
var msg json.RawMessage
err = json.NewDecoder(resp.Body).Decode(&msg)
switch {
case err == io.EOF:
// empty body
return nil, nil
case err != nil:
// other error
return nil, err
}
// check for PowerDNS error message
if len(msg) > 0 && msg[0] == '{' {
var apiError APIError
err = json.Unmarshal(msg, &apiError)
if err != nil {
return nil, err
}
if apiError.Error != "" {
return nil, fmt.Errorf("Error talking to PDNS API -> %v", apiError.Error)
}
}
return msg, nil
}
type pdnsRecord struct {
Content string `json:"content"`
Disabled bool `json:"disabled"`
// pre-v1 API
Name string `json:"name"`
Type string `json:"type"`
TTL int `json:"ttl,omitempty"`
}
type hostedZone struct {
ID string `json:"id"`
Name string `json:"name"`
URL string `json:"url"`
RRSets []rrSet `json:"rrsets"`
// pre-v1 API
Records []pdnsRecord `json:"records"`
}
type rrSet struct {
Name string `json:"name"`
Type string `json:"type"`
Kind string `json:"kind"`
ChangeType string `json:"changetype"`
Records []pdnsRecord `json:"records"`
TTL int `json:"ttl,omitempty"`
}
type rrSets struct {
RRSets []rrSet `json:"rrsets"`
}