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lego/providers/dns/bluecat/bluecat.go
2019-08-20 18:40:41 +02:00

202 lines
5.6 KiB
Go

// Package bluecat implements a DNS provider for solving the DNS-01 challenge using a self-hosted Bluecat Address Manager.
package bluecat
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"time"
"github.com/go-acme/lego/v3/challenge/dns01"
"github.com/go-acme/lego/v3/platform/config/env"
)
const (
configType = "Configuration"
viewType = "View"
zoneType = "Zone"
txtType = "TXTRecord"
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
BaseURL string
UserName string
Password string
ConfigName string
DNSView 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{
TTL: env.GetOrDefaultInt("BLUECAT_TTL", dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond("BLUECAT_PROPAGATION_TIMEOUT", dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("BLUECAT_POLLING_INTERVAL", dns01.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("BLUECAT_HTTP_TIMEOUT", 30*time.Second),
},
}
}
// DNSProvider is an implementation of the challenge.Provider interface that uses
// Bluecat's Address Manager REST API to manage TXT records for a domain.
type DNSProvider struct {
config *Config
token string
}
// NewDNSProvider returns a DNSProvider instance configured for Bluecat DNS.
// Credentials must be passed in the environment variables: BLUECAT_SERVER_URL, BLUECAT_USER_NAME and BLUECAT_PASSWORD.
// BLUECAT_SERVER_URL should have the scheme, hostname, and port (if required) of the authoritative Bluecat BAM server.
// The REST endpoint will be appended.
// In addition, the Configuration name and external DNS View Name must be passed in BLUECAT_CONFIG_NAME and BLUECAT_DNS_VIEW
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("BLUECAT_SERVER_URL", "BLUECAT_USER_NAME", "BLUECAT_PASSWORD", "BLUECAT_CONFIG_NAME", "BLUECAT_DNS_VIEW")
if err != nil {
return nil, fmt.Errorf("bluecat: %v", err)
}
config := NewDefaultConfig()
config.BaseURL = values["BLUECAT_SERVER_URL"]
config.UserName = values["BLUECAT_USER_NAME"]
config.Password = values["BLUECAT_PASSWORD"]
config.ConfigName = values["BLUECAT_CONFIG_NAME"]
config.DNSView = values["BLUECAT_DNS_VIEW"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Bluecat DNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("bluecat: the configuration of the DNS provider is nil")
}
if config.BaseURL == "" || config.UserName == "" || config.Password == "" || config.ConfigName == "" || config.DNSView == "" {
return nil, fmt.Errorf("bluecat: credentials missing")
}
return &DNSProvider{config: config}, nil
}
// Present creates a TXT record using the specified parameters
// This will *not* create a subzone to contain the TXT record,
// so make sure the FQDN specified is within an extant zone.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
err := d.login()
if err != nil {
return err
}
viewID, err := d.lookupViewID(d.config.DNSView)
if err != nil {
return err
}
parentZoneID, name, err := d.lookupParentZoneID(viewID, fqdn)
if err != nil {
return err
}
queryArgs := map[string]string{
"parentId": strconv.FormatUint(uint64(parentZoneID), 10),
}
body := bluecatEntity{
Name: name,
Type: "TXTRecord",
Properties: fmt.Sprintf("ttl=%d|absoluteName=%s|txt=%s|", d.config.TTL, fqdn, value),
}
resp, err := d.sendRequest(http.MethodPost, "addEntity", body, queryArgs)
if err != nil {
return err
}
defer resp.Body.Close()
addTxtBytes, _ := ioutil.ReadAll(resp.Body)
addTxtResp := string(addTxtBytes)
// addEntity responds only with body text containing the ID of the created record
_, err = strconv.ParseUint(addTxtResp, 10, 64)
if err != nil {
return fmt.Errorf("bluecat: addEntity request failed: %s", addTxtResp)
}
err = d.deploy(parentZoneID)
if err != nil {
return err
}
return d.logout()
}
// CleanUp removes the TXT record matching the specified parameters
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
err := d.login()
if err != nil {
return err
}
viewID, err := d.lookupViewID(d.config.DNSView)
if err != nil {
return err
}
parentID, name, err := d.lookupParentZoneID(viewID, fqdn)
if err != nil {
return err
}
queryArgs := map[string]string{
"parentId": strconv.FormatUint(uint64(parentID), 10),
"name": name,
"type": txtType,
}
resp, err := d.sendRequest(http.MethodGet, "getEntityByName", nil, queryArgs)
if err != nil {
return err
}
defer resp.Body.Close()
var txtRec entityResponse
err = json.NewDecoder(resp.Body).Decode(&txtRec)
if err != nil {
return fmt.Errorf("bluecat: %v", err)
}
queryArgs = map[string]string{
"objectId": strconv.FormatUint(uint64(txtRec.ID), 10),
}
resp, err = d.sendRequest(http.MethodDelete, http.MethodDelete, nil, queryArgs)
if err != nil {
return err
}
defer resp.Body.Close()
err = d.deploy(parentID)
if err != nil {
return err
}
return d.logout()
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}