traefik/provider/acme/provider.go
2018-11-27 17:42:04 +01:00

846 lines
27 KiB
Go

package acme
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
fmtlog "log"
"net"
"net/url"
"reflect"
"strings"
"sync"
"time"
"github.com/cenk/backoff"
"github.com/containous/flaeg/parse"
"github.com/containous/traefik/config"
"github.com/containous/traefik/log"
"github.com/containous/traefik/rules"
"github.com/containous/traefik/safe"
traefiktls "github.com/containous/traefik/tls"
"github.com/containous/traefik/types"
"github.com/containous/traefik/version"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/xenolf/lego/acme"
legolog "github.com/xenolf/lego/log"
"github.com/xenolf/lego/providers/dns"
)
var (
// oscpMustStaple enables OSCP stapling as from https://github.com/xenolf/lego/issues/270
oscpMustStaple = false
)
// Configuration holds ACME configuration provided by users
type Configuration struct {
Email string `description:"Email address used for registration"`
ACMELogging bool `description:"Enable debug logging of ACME actions."`
CAServer string `description:"CA server to use."`
Storage string `description:"Storage to use."`
EntryPoint string `description:"EntryPoint to use."`
KeyType string `description:"KeyType used for generating certificate private key. Allow value 'EC256', 'EC384', 'RSA2048', 'RSA4096', 'RSA8192'. Default to 'RSA4096'"`
OnHostRule bool `description:"Enable certificate generation on frontends Host rules."`
OnDemand bool `description:"Enable on demand certificate generation. This will request a certificate from Let's Encrypt during the first TLS handshake for a hostname that does not yet have a certificate."` // Deprecated
DNSChallenge *DNSChallenge `description:"Activate DNS-01 Challenge"`
HTTPChallenge *HTTPChallenge `description:"Activate HTTP-01 Challenge"`
TLSChallenge *TLSChallenge `description:"Activate TLS-ALPN-01 Challenge"`
Domains []types.Domain `description:"CN and SANs (alternative domains) to each main domain using format: --acme.domains='main.com,san1.com,san2.com' --acme.domains='*.main.net'. No SANs for wildcards domain. Wildcard domains only accepted with DNSChallenge"`
}
// Certificate is a struct which contains all data needed from an ACME certificate
type Certificate struct {
Domain types.Domain
Certificate []byte
Key []byte
}
// DNSChallenge contains DNS challenge Configuration
type DNSChallenge struct {
Provider string `description:"Use a DNS-01 based challenge provider rather than HTTPS."`
DelayBeforeCheck parse.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."`
Resolvers types.DNSResolvers `description:"Use following DNS servers to resolve the FQDN authority."`
DisablePropagationCheck bool `description:"Disable the DNS propagation checks before notifying ACME that the DNS challenge is ready. [not recommended]"`
preCheckTimeout time.Duration
preCheckInterval time.Duration
}
// HTTPChallenge contains HTTP challenge Configuration
type HTTPChallenge struct {
EntryPoint string `description:"HTTP challenge EntryPoint"`
}
// TLSChallenge contains TLS challenge Configuration
type TLSChallenge struct{}
// Provider holds configurations of the provider.
type Provider struct {
*Configuration
Store Store
certificates []*Certificate
account *Account
client *acme.Client
certsChan chan *Certificate
configurationChan chan<- config.Message
certificateStore *traefiktls.CertificateStore
clientMutex sync.Mutex
configFromListenerChan chan config.Configuration
pool *safe.Pool
resolvingDomains map[string]struct{}
resolvingDomainsMutex sync.RWMutex
}
// SetConfigListenerChan initializes the configFromListenerChan
func (p *Provider) SetConfigListenerChan(configFromListenerChan chan config.Configuration) {
p.configFromListenerChan = configFromListenerChan
}
// SetCertificateStore allow to initialize certificate store
func (p *Provider) SetCertificateStore(certificateStore *traefiktls.CertificateStore) {
p.certificateStore = certificateStore
}
// ListenConfiguration sets a new Configuration into the configFromListenerChan
func (p *Provider) ListenConfiguration(config config.Configuration) {
p.configFromListenerChan <- config
}
// ListenRequest resolves new certificates for a domain from an incoming request and return a valid Certificate to serve (onDemand option)
func (p *Provider) ListenRequest(domain string) (*tls.Certificate, error) {
ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme"))
acmeCert, err := p.resolveCertificate(ctx, types.Domain{Main: domain}, false)
if acmeCert == nil || err != nil {
return nil, err
}
certificate, err := tls.X509KeyPair(acmeCert.Certificate, acmeCert.PrivateKey)
return &certificate, err
}
// Init for compatibility reason the BaseProvider implements an empty Init
func (p *Provider) Init() error {
ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme"))
logger := log.FromContext(ctx)
acme.UserAgent = fmt.Sprintf("containous-traefik/%s", version.Version)
if p.ACMELogging {
legolog.Logger = fmtlog.New(logger.WriterLevel(logrus.InfoLevel), "legolog: ", 0)
} else {
legolog.Logger = fmtlog.New(ioutil.Discard, "", 0)
}
if p.Store == nil {
return errors.New("no store found for the ACME provider")
}
var err error
p.account, err = p.Store.GetAccount()
if err != nil {
return fmt.Errorf("unable to get ACME account : %v", err)
}
// Reset Account if caServer changed, thus registration URI can be updated
if p.account != nil && p.account.Registration != nil && !isAccountMatchingCaServer(ctx, p.account.Registration.URI, p.CAServer) {
logger.Info("Account URI does not match the current CAServer. The account will be reset.")
p.account = nil
}
p.certificates, err = p.Store.GetCertificates()
if err != nil {
return fmt.Errorf("unable to get ACME certificates : %v", err)
}
// Init the currently resolved domain map
p.resolvingDomains = make(map[string]struct{})
return nil
}
func isAccountMatchingCaServer(ctx context.Context, accountURI string, serverURI string) bool {
logger := log.FromContext(ctx)
aru, err := url.Parse(accountURI)
if err != nil {
logger.Infof("Unable to parse account.Registration URL: %v", err)
return false
}
cau, err := url.Parse(serverURI)
if err != nil {
logger.Infof("Unable to parse CAServer URL: %v", err)
return false
}
return cau.Hostname() == aru.Hostname()
}
// Provide allows the file provider to provide configurations to traefik
// using the given Configuration channel.
func (p *Provider) Provide(configurationChan chan<- config.Message, pool *safe.Pool) error {
ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme"))
p.pool = pool
p.watchCertificate(ctx)
p.watchNewDomains(ctx)
p.configurationChan = configurationChan
p.refreshCertificates()
p.deleteUnnecessaryDomains(ctx)
for i := 0; i < len(p.Domains); i++ {
domain := p.Domains[i]
safe.Go(func() {
if _, err := p.resolveCertificate(ctx, domain, true); err != nil {
log.WithoutContext().WithField(log.ProviderName, "acme").
Errorf("Unable to obtain ACME certificate for domains %q : %v", strings.Join(domain.ToStrArray(), ","), err)
}
})
}
p.renewCertificates(ctx)
ticker := time.NewTicker(24 * time.Hour)
pool.Go(func(stop chan bool) {
for {
select {
case <-ticker.C:
p.renewCertificates(ctx)
case <-stop:
ticker.Stop()
return
}
}
})
return nil
}
func (p *Provider) getClient() (*acme.Client, error) {
p.clientMutex.Lock()
defer p.clientMutex.Unlock()
ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme"))
logger := log.FromContext(ctx)
if p.client != nil {
return p.client, nil
}
account, err := p.initAccount(ctx)
if err != nil {
return nil, err
}
logger.Debug("Building ACME client...")
caServer := "https://acme-v02.api.letsencrypt.org/directory"
if len(p.CAServer) > 0 {
caServer = p.CAServer
}
logger.Debug(caServer)
client, err := acme.NewClient(caServer, account, account.KeyType)
if err != nil {
return nil, err
}
// New users will need to register; be sure to save it
if account.GetRegistration() == nil {
logger.Info("Register...")
reg, errR := client.Register(true)
if errR != nil {
return nil, errR
}
account.Registration = reg
}
// Save the account once before all the certificates generation/storing
// No certificate can be generated if account is not initialized
err = p.Store.SaveAccount(account)
if err != nil {
return nil, err
}
if p.DNSChallenge != nil && len(p.DNSChallenge.Provider) > 0 {
logger.Debugf("Using DNS Challenge provider: %s", p.DNSChallenge.Provider)
SetRecursiveNameServers(p.DNSChallenge.Resolvers)
SetPropagationCheck(p.DNSChallenge.DisablePropagationCheck)
err = dnsOverrideDelay(ctx, p.DNSChallenge.DelayBeforeCheck)
if err != nil {
return nil, err
}
var provider acme.ChallengeProvider
provider, err = dns.NewDNSChallengeProviderByName(p.DNSChallenge.Provider)
if err != nil {
return nil, err
}
client.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.TLSALPN01})
err = client.SetChallengeProvider(acme.DNS01, provider)
if err != nil {
return nil, err
}
// Same default values than LEGO
p.DNSChallenge.preCheckTimeout = 60 * time.Second
p.DNSChallenge.preCheckInterval = 2 * time.Second
// Set the precheck timeout into the DNSChallenge provider
if challengeProviderTimeout, ok := provider.(acme.ChallengeProviderTimeout); ok {
p.DNSChallenge.preCheckTimeout, p.DNSChallenge.preCheckInterval = challengeProviderTimeout.Timeout()
}
} else if p.HTTPChallenge != nil && len(p.HTTPChallenge.EntryPoint) > 0 {
logger.Debug("Using HTTP Challenge provider.")
client.ExcludeChallenges([]acme.Challenge{acme.DNS01, acme.TLSALPN01})
err = client.SetChallengeProvider(acme.HTTP01, &challengeHTTP{Store: p.Store})
if err != nil {
return nil, err
}
} else if p.TLSChallenge != nil {
logger.Debug("Using TLS Challenge provider.")
client.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.DNS01})
err = client.SetChallengeProvider(acme.TLSALPN01, &challengeTLSALPN{Store: p.Store})
if err != nil {
return nil, err
}
} else {
return nil, errors.New("ACME challenge not specified, please select TLS or HTTP or DNS Challenge")
}
p.client = client
return p.client, nil
}
func (p *Provider) initAccount(ctx context.Context) (*Account, error) {
if p.account == nil || len(p.account.Email) == 0 {
var err error
p.account, err = NewAccount(ctx, p.Email, p.KeyType)
if err != nil {
return nil, err
}
}
// Set the KeyType if not already defined in the account
if len(p.account.KeyType) == 0 {
p.account.KeyType = GetKeyType(ctx, p.KeyType)
}
return p.account, nil
}
func (p *Provider) watchNewDomains(ctx context.Context) {
p.pool.Go(func(stop chan bool) {
for {
select {
case config := <-p.configFromListenerChan:
for routerName, route := range config.Routers {
logger := log.FromContext(ctx).WithField(log.RouterName, routerName)
// FIXME use new rule system
domainRules := rules.Rules{}
domains, err := domainRules.ParseDomains(route.Rule)
if err != nil {
logger.Errorf("Error parsing domains in provider ACME: %v", err)
continue
}
if len(domains) == 0 {
logger.Debugf("No domain parsed in rule %q in provider ACME", route.Rule)
continue
}
logger.Debugf("Try to challenge certificate for domain %v founded in Host rule", domains)
var domain types.Domain
if len(domains) > 0 {
domain = types.Domain{Main: domains[0]}
if len(domains) > 1 {
domain.SANs = domains[1:]
}
safe.Go(func() {
if _, err := p.resolveCertificate(ctx, domain, false); err != nil {
logger.Errorf("Unable to obtain ACME certificate for domains %q detected thanks to rule %q : %v", strings.Join(domains, ","), route.Rule, err)
}
})
}
}
case <-stop:
return
}
}
})
}
func (p *Provider) resolveCertificate(ctx context.Context, domain types.Domain, domainFromConfigurationFile bool) (*acme.CertificateResource, error) {
domains, err := p.getValidDomains(ctx, domain, domainFromConfigurationFile)
if err != nil {
return nil, err
}
// Check provided certificates
uncheckedDomains := p.getUncheckedDomains(ctx, domains, !domainFromConfigurationFile)
if len(uncheckedDomains) == 0 {
return nil, nil
}
p.addResolvingDomains(uncheckedDomains)
defer p.removeResolvingDomains(uncheckedDomains)
logger := log.FromContext(ctx)
logger.Debugf("Loading ACME certificates %+v...", uncheckedDomains)
client, err := p.getClient()
if err != nil {
return nil, fmt.Errorf("cannot get ACME client %v", err)
}
var certificate *acme.CertificateResource
bundle := true
if p.useCertificateWithRetry(uncheckedDomains) {
certificate, err = obtainCertificateWithRetry(ctx, domains, client, p.DNSChallenge.preCheckTimeout, p.DNSChallenge.preCheckInterval, bundle)
} else {
certificate, err = client.ObtainCertificate(domains, bundle, nil, oscpMustStaple)
}
if err != nil {
return nil, fmt.Errorf("unable to generate a certificate for the domains %v: %v", uncheckedDomains, err)
}
if certificate == nil {
return nil, fmt.Errorf("domains %v do not generate a certificate", uncheckedDomains)
}
if len(certificate.Certificate) == 0 || len(certificate.PrivateKey) == 0 {
return nil, fmt.Errorf("domains %v generate certificate with no value: %v", uncheckedDomains, certificate)
}
logger.Debugf("Certificates obtained for domains %+v", uncheckedDomains)
if len(uncheckedDomains) > 1 {
domain = types.Domain{Main: uncheckedDomains[0], SANs: uncheckedDomains[1:]}
} else {
domain = types.Domain{Main: uncheckedDomains[0]}
}
p.addCertificateForDomain(domain, certificate.Certificate, certificate.PrivateKey)
return certificate, nil
}
func (p *Provider) removeResolvingDomains(resolvingDomains []string) {
p.resolvingDomainsMutex.Lock()
defer p.resolvingDomainsMutex.Unlock()
for _, domain := range resolvingDomains {
delete(p.resolvingDomains, domain)
}
}
func (p *Provider) addResolvingDomains(resolvingDomains []string) {
p.resolvingDomainsMutex.Lock()
defer p.resolvingDomainsMutex.Unlock()
for _, domain := range resolvingDomains {
p.resolvingDomains[domain] = struct{}{}
}
}
func (p *Provider) useCertificateWithRetry(domains []string) bool {
// Check if we can use the retry mechanism only if we use the DNS Challenge and if is there are at least 2 domains to check
if p.DNSChallenge != nil && len(domains) > 1 {
rootDomain := ""
for _, searchWildcardDomain := range domains {
// Search a wildcard domain if not already found
if len(rootDomain) == 0 && strings.HasPrefix(searchWildcardDomain, "*.") {
rootDomain = strings.TrimPrefix(searchWildcardDomain, "*.")
if len(rootDomain) > 0 {
// Look for a root domain which matches the wildcard domain
for _, searchRootDomain := range domains {
if rootDomain == searchRootDomain {
// If the domains list contains a wildcard domain and its root domain, we can use the retry mechanism to obtain the certificate
return true
}
}
}
// There is only one wildcard domain in the slice, if its root domain has not been found, the retry mechanism does not have to be used
return false
}
}
}
return false
}
func obtainCertificateWithRetry(ctx context.Context, domains []string, client *acme.Client, timeout, interval time.Duration, bundle bool) (*acme.CertificateResource, error) {
logger := log.FromContext(ctx)
var certificate *acme.CertificateResource
var err error
operation := func() error {
certificate, err = client.ObtainCertificate(domains, bundle, nil, oscpMustStaple)
return err
}
notify := func(err error, time time.Duration) {
logger.Errorf("Error obtaining certificate retrying in %s", time)
}
// Define a retry backOff to let LEGO tries twice to obtain a certificate for both wildcard and root domain
ebo := backoff.NewExponentialBackOff()
ebo.MaxElapsedTime = 2 * timeout
ebo.MaxInterval = interval
rbo := backoff.WithMaxRetries(ebo, 2)
err = backoff.RetryNotify(safe.OperationWithRecover(operation), rbo, notify)
if err != nil {
logger.Errorf("Error obtaining certificate: %v", err)
return nil, err
}
return certificate, nil
}
func dnsOverrideDelay(ctx context.Context, delay parse.Duration) error {
if delay == 0 {
return nil
}
if delay > 0 {
log.FromContext(ctx).Debugf("Delaying %d rather than validating DNS propagation now.", delay)
acme.PreCheckDNS = func(_, _ string) (bool, error) {
time.Sleep(time.Duration(delay))
return true, nil
}
} else {
return fmt.Errorf("delayBeforeCheck: %d cannot be less than 0", delay)
}
return nil
}
func (p *Provider) addCertificateForDomain(domain types.Domain, certificate []byte, key []byte) {
p.certsChan <- &Certificate{Certificate: certificate, Key: key, Domain: domain}
}
// deleteUnnecessaryDomains deletes from the configuration :
// - Duplicated domains
// - Domains which are checked by wildcard domain
func (p *Provider) deleteUnnecessaryDomains(ctx context.Context) {
var newDomains []types.Domain
logger := log.FromContext(ctx)
for idxDomainToCheck, domainToCheck := range p.Domains {
keepDomain := true
for idxDomain, domain := range p.Domains {
if idxDomainToCheck == idxDomain {
continue
}
if reflect.DeepEqual(domain, domainToCheck) {
if idxDomainToCheck > idxDomain {
logger.Warnf("The domain %v is duplicated in the configuration but will be process by ACME provider only once.", domainToCheck)
keepDomain = false
}
break
}
// Check if CN or SANS to check already exists
// or can not be checked by a wildcard
var newDomainsToCheck []string
for _, domainProcessed := range domainToCheck.ToStrArray() {
if idxDomain < idxDomainToCheck && isDomainAlreadyChecked(domainProcessed, domain.ToStrArray()) {
// The domain is duplicated in a CN
logger.Warnf("Domain %q is duplicated in the configuration or validated by the domain %v. It will be processed once.", domainProcessed, domain)
continue
} else if domain.Main != domainProcessed && strings.HasPrefix(domain.Main, "*") && isDomainAlreadyChecked(domainProcessed, []string{domain.Main}) {
// Check if a wildcard can validate the domain
logger.Warnf("Domain %q will not be processed by ACME provider because it is validated by the wildcard %q", domainProcessed, domain.Main)
continue
}
newDomainsToCheck = append(newDomainsToCheck, domainProcessed)
}
// Delete the domain if both Main and SANs can be validated by the wildcard domain
// otherwise keep the unchecked values
if newDomainsToCheck == nil {
keepDomain = false
break
}
domainToCheck.Set(newDomainsToCheck)
}
if keepDomain {
newDomains = append(newDomains, domainToCheck)
}
}
p.Domains = newDomains
}
func (p *Provider) watchCertificate(ctx context.Context) {
p.certsChan = make(chan *Certificate)
p.pool.Go(func(stop chan bool) {
for {
select {
case cert := <-p.certsChan:
certUpdated := false
for _, domainsCertificate := range p.certificates {
if reflect.DeepEqual(cert.Domain, domainsCertificate.Domain) {
domainsCertificate.Certificate = cert.Certificate
domainsCertificate.Key = cert.Key
certUpdated = true
break
}
}
if !certUpdated {
p.certificates = append(p.certificates, cert)
}
err := p.saveCertificates()
if err != nil {
log.FromContext(ctx).Error(err)
}
case <-stop:
return
}
}
})
}
func (p *Provider) saveCertificates() error {
err := p.Store.SaveCertificates(p.certificates)
p.refreshCertificates()
return err
}
func (p *Provider) refreshCertificates() {
conf := config.Message{
ProviderName: "ACME",
Configuration: &config.Configuration{
Routers: map[string]*config.Router{},
Middlewares: map[string]*config.Middleware{},
Services: map[string]*config.Service{},
TLS: []*traefiktls.Configuration{},
},
}
for _, cert := range p.certificates {
certificate := &traefiktls.Certificate{CertFile: traefiktls.FileOrContent(cert.Certificate), KeyFile: traefiktls.FileOrContent(cert.Key)}
conf.Configuration.TLS = append(conf.Configuration.TLS, &traefiktls.Configuration{Certificate: certificate, EntryPoints: []string{p.EntryPoint}})
}
p.configurationChan <- conf
}
func (p *Provider) renewCertificates(ctx context.Context) {
logger := log.FromContext(ctx)
logger.Info("Testing certificate renew...")
for _, certificate := range p.certificates {
crt, err := getX509Certificate(ctx, certificate)
// If there's an error, we assume the cert is broken, and needs update
// <= 30 days left, renew certificate
if err != nil || crt == nil || crt.NotAfter.Before(time.Now().Add(24*30*time.Hour)) {
client, err := p.getClient()
if err != nil {
logger.Infof("Error renewing certificate from LE : %+v, %v", certificate.Domain, err)
continue
}
logger.Infof("Renewing certificate from LE : %+v", certificate.Domain)
renewedCert, err := client.RenewCertificate(acme.CertificateResource{
Domain: certificate.Domain.Main,
PrivateKey: certificate.Key,
Certificate: certificate.Certificate,
}, true, oscpMustStaple)
if err != nil {
logger.Errorf("Error renewing certificate from LE: %v, %v", certificate.Domain, err)
continue
}
if len(renewedCert.Certificate) == 0 || len(renewedCert.PrivateKey) == 0 {
logger.Errorf("domains %v renew certificate with no value: %v", certificate.Domain.ToStrArray(), certificate)
continue
}
p.addCertificateForDomain(certificate.Domain, renewedCert.Certificate, renewedCert.PrivateKey)
}
}
}
// Get provided certificate which check a domains list (Main and SANs)
// from static and dynamic provided certificates
func (p *Provider) getUncheckedDomains(ctx context.Context, domainsToCheck []string, checkConfigurationDomains bool) []string {
p.resolvingDomainsMutex.RLock()
defer p.resolvingDomainsMutex.RUnlock()
log.FromContext(ctx).Debugf("Looking for provided certificate(s) to validate %q...", domainsToCheck)
allDomains := p.certificateStore.GetAllDomains()
// Get ACME certificates
for _, certificate := range p.certificates {
allDomains = append(allDomains, strings.Join(certificate.Domain.ToStrArray(), ","))
}
// Get currently resolved domains
for domain := range p.resolvingDomains {
allDomains = append(allDomains, domain)
}
// Get Configuration Domains
if checkConfigurationDomains {
for i := 0; i < len(p.Domains); i++ {
allDomains = append(allDomains, strings.Join(p.Domains[i].ToStrArray(), ","))
}
}
return searchUncheckedDomains(ctx, domainsToCheck, allDomains)
}
func searchUncheckedDomains(ctx context.Context, domainsToCheck []string, existentDomains []string) []string {
var uncheckedDomains []string
for _, domainToCheck := range domainsToCheck {
if !isDomainAlreadyChecked(domainToCheck, existentDomains) {
uncheckedDomains = append(uncheckedDomains, domainToCheck)
}
}
logger := log.FromContext(ctx)
if len(uncheckedDomains) == 0 {
logger.Debugf("No ACME certificate generation required for domains %q.", domainsToCheck)
} else {
logger.Debugf("Domains %q need ACME certificates generation for domains %q.", domainsToCheck, strings.Join(uncheckedDomains, ","))
}
return uncheckedDomains
}
func getX509Certificate(ctx context.Context, certificate *Certificate) (*x509.Certificate, error) {
logger := log.FromContext(ctx)
tlsCert, err := tls.X509KeyPair(certificate.Certificate, certificate.Key)
if err != nil {
logger.Errorf("Failed to load TLS key pair from ACME certificate for domain %q (SAN : %q), certificate will be renewed : %v", certificate.Domain.Main, strings.Join(certificate.Domain.SANs, ","), err)
return nil, err
}
crt := tlsCert.Leaf
if crt == nil {
crt, err = x509.ParseCertificate(tlsCert.Certificate[0])
if err != nil {
logger.Errorf("Failed to parse TLS key pair from ACME certificate for domain %q (SAN : %q), certificate will be renewed : %v", certificate.Domain.Main, strings.Join(certificate.Domain.SANs, ","), err)
}
}
return crt, err
}
// getValidDomains checks if given domain is allowed to generate a ACME certificate and return it
func (p *Provider) getValidDomains(ctx context.Context, domain types.Domain, wildcardAllowed bool) ([]string, error) {
domains := domain.ToStrArray()
if len(domains) == 0 {
return nil, errors.New("unable to generate a certificate in ACME provider when no domain is given")
}
if strings.HasPrefix(domain.Main, "*") {
if !wildcardAllowed {
return nil, fmt.Errorf("unable to generate a wildcard certificate in ACME provider for domain %q from a 'Host' rule", strings.Join(domains, ","))
}
if p.DNSChallenge == nil {
return nil, fmt.Errorf("unable to generate a wildcard certificate in ACME provider for domain %q : ACME needs a DNSChallenge", strings.Join(domains, ","))
}
if strings.HasPrefix(domain.Main, "*.*") {
return nil, fmt.Errorf("unable to generate a wildcard certificate in ACME provider for domain %q : ACME does not allow '*.*' wildcard domain", strings.Join(domains, ","))
}
}
for _, san := range domain.SANs {
if strings.HasPrefix(san, "*") {
return nil, fmt.Errorf("unable to generate a certificate in ACME provider for domains %q: SAN %q can not be a wildcard domain", strings.Join(domains, ","), san)
}
}
var cleanDomains []string
for _, domain := range domains {
canonicalDomain := types.CanonicalDomain(domain)
cleanDomain := acme.UnFqdn(canonicalDomain)
if canonicalDomain != cleanDomain {
log.FromContext(ctx).Warnf("FQDN detected, please remove the trailing dot: %s", canonicalDomain)
}
cleanDomains = append(cleanDomains, cleanDomain)
}
return cleanDomains, nil
}
func isDomainAlreadyChecked(domainToCheck string, existentDomains []string) bool {
for _, certDomains := range existentDomains {
for _, certDomain := range strings.Split(certDomains, ",") {
if types.MatchDomain(domainToCheck, certDomain) {
return true
}
}
}
return false
}
// SetPropagationCheck to disable the Lego PreCheck.
func SetPropagationCheck(disable bool) {
if disable {
acme.PreCheckDNS = func(_, _ string) (bool, error) {
return true, nil
}
}
}
// SetRecursiveNameServers to provide a custom DNS resolver.
func SetRecursiveNameServers(dnsResolvers []string) {
resolvers := normaliseDNSResolvers(dnsResolvers)
if len(resolvers) > 0 {
acme.RecursiveNameservers = resolvers
log.Infof("Validating FQDN authority with DNS using %+v", resolvers)
}
}
// ensure all servers have a port number
func normaliseDNSResolvers(dnsResolvers []string) []string {
var normalisedResolvers []string
for _, server := range dnsResolvers {
srv := strings.TrimSpace(server)
if len(srv) > 0 {
if host, port, err := net.SplitHostPort(srv); err != nil {
normalisedResolvers = append(normalisedResolvers, net.JoinHostPort(srv, "53"))
} else {
normalisedResolvers = append(normalisedResolvers, net.JoinHostPort(host, port))
}
}
}
return normalisedResolvers
}