224 lines
6.6 KiB
Go
224 lines
6.6 KiB
Go
// Package gandi implements a DNS provider for solving the DNS-01 challenge using Gandi DNS.
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package gandi
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import (
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"errors"
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"fmt"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/go-acme/lego/v3/challenge/dns01"
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"github.com/go-acme/lego/v3/platform/config/env"
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)
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// Gandi API reference: http://doc.rpc.gandi.net/index.html
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// Gandi API domain examples: http://doc.rpc.gandi.net/domain/faq.html
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const (
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// defaultBaseURL Gandi XML-RPC endpoint used by Present and CleanUp.
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defaultBaseURL = "https://rpc.gandi.net/xmlrpc/"
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minTTL = 300
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)
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// Environment variables names.
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const (
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envNamespace = "GANDI_"
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EnvAPIKey = envNamespace + "API_KEY"
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EnvTTL = envNamespace + "TTL"
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EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
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EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
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EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
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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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BaseURL string
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APIKey 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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TTL: env.GetOrDefaultInt(EnvTTL, minTTL),
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PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 40*time.Minute),
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PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 60*time.Second),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 60*time.Second),
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},
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}
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}
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// inProgressInfo contains information about an in-progress challenge.
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type inProgressInfo struct {
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zoneID int // zoneID of gandi zone to restore in CleanUp
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newZoneID int // zoneID of temporary gandi zone containing TXT record
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authZone string // the domain name registered at gandi with trailing "."
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}
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// DNSProvider implements the challenge.Provider interface.
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type DNSProvider struct {
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inProgressFQDNs map[string]inProgressInfo
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inProgressAuthZones map[string]struct{}
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inProgressMu sync.Mutex
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config *Config
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// findZoneByFqdn determines the DNS zone of an fqdn. It is overridden during tests.
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findZoneByFqdn func(fqdn string) (string, error)
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}
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// NewDNSProvider returns a DNSProvider instance configured for Gandi.
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// Credentials must be passed in the environment variable: GANDI_API_KEY.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get(EnvAPIKey)
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if err != nil {
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return nil, fmt.Errorf("gandi: %w", err)
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}
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config := NewDefaultConfig()
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config.APIKey = values[EnvAPIKey]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for Gandi.
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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("gandi: the configuration of the DNS provider is nil")
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}
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if config.APIKey == "" {
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return nil, errors.New("gandi: no API Key given")
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}
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if config.BaseURL == "" {
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config.BaseURL = defaultBaseURL
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}
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return &DNSProvider{
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config: config,
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inProgressFQDNs: make(map[string]inProgressInfo),
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inProgressAuthZones: make(map[string]struct{}),
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findZoneByFqdn: dns01.FindZoneByFqdn,
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}, nil
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}
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// Present creates a TXT record using the specified parameters. It
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// does this by creating and activating a new temporary Gandi DNS
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// zone. This new zone contains the TXT record.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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fqdn, value := dns01.GetRecord(domain, keyAuth)
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if d.config.TTL < minTTL {
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d.config.TTL = minTTL // 300 is gandi minimum value for ttl
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}
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// find authZone and Gandi zone_id for fqdn
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authZone, err := d.findZoneByFqdn(fqdn)
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if err != nil {
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return fmt.Errorf("gandi: findZoneByFqdn failure: %w", err)
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}
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zoneID, err := d.getZoneID(authZone)
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if err != nil {
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return fmt.Errorf("gandi: %w", err)
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}
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// determine name of TXT record
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if !strings.HasSuffix(
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strings.ToLower(fqdn), strings.ToLower("."+authZone)) {
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return fmt.Errorf("gandi: unexpected authZone %s for fqdn %s", authZone, fqdn)
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}
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name := fqdn[:len(fqdn)-len("."+authZone)]
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// acquire lock and check there is not a challenge already in
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// progress for this value of authZone
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d.inProgressMu.Lock()
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defer d.inProgressMu.Unlock()
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if _, ok := d.inProgressAuthZones[authZone]; ok {
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return fmt.Errorf("gandi: challenge already in progress for authZone %s", authZone)
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}
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// perform API actions to create and activate new gandi zone
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// containing the required TXT record
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newZoneName := fmt.Sprintf("%s [ACME Challenge %s]", dns01.UnFqdn(authZone), time.Now().Format(time.RFC822Z))
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newZoneID, err := d.cloneZone(zoneID, newZoneName)
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if err != nil {
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return err
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}
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newZoneVersion, err := d.newZoneVersion(newZoneID)
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if err != nil {
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return fmt.Errorf("gandi: %w", err)
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}
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err = d.addTXTRecord(newZoneID, newZoneVersion, name, value, d.config.TTL)
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if err != nil {
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return fmt.Errorf("gandi: %w", err)
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}
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err = d.setZoneVersion(newZoneID, newZoneVersion)
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if err != nil {
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return fmt.Errorf("gandi: %w", err)
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}
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err = d.setZone(authZone, newZoneID)
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if err != nil {
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return fmt.Errorf("gandi: %w", err)
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}
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// save data necessary for CleanUp
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d.inProgressFQDNs[fqdn] = inProgressInfo{
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zoneID: zoneID,
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newZoneID: newZoneID,
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authZone: authZone,
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}
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d.inProgressAuthZones[authZone] = struct{}{}
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return nil
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}
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// CleanUp removes the TXT record matching the specified
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// parameters. It does this by restoring the old Gandi DNS zone and
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// removing the temporary one created by Present.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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fqdn, _ := dns01.GetRecord(domain, keyAuth)
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// acquire lock and retrieve zoneID, newZoneID and authZone
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d.inProgressMu.Lock()
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defer d.inProgressMu.Unlock()
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if _, ok := d.inProgressFQDNs[fqdn]; !ok {
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// if there is no cleanup information then just return
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return nil
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}
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zoneID := d.inProgressFQDNs[fqdn].zoneID
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newZoneID := d.inProgressFQDNs[fqdn].newZoneID
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authZone := d.inProgressFQDNs[fqdn].authZone
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delete(d.inProgressFQDNs, fqdn)
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delete(d.inProgressAuthZones, authZone)
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// perform API actions to restore old gandi zone for authZone
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err := d.setZone(authZone, zoneID)
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if err != nil {
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return fmt.Errorf("gandi: %w", err)
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}
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return d.deleteZone(newZoneID)
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}
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// Timeout returns the values (40*time.Minute, 60*time.Second) which
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// are used by the acme package as timeout and check interval values
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// when checking for DNS record propagation with Gandi.
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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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