traefik/provider/acme/provider.go

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package acme
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
fmtlog "log"
"net"
"net/http"
"os"
"reflect"
"strings"
"sync"
"time"
"github.com/BurntSushi/ty/fun"
"github.com/containous/flaeg"
"github.com/containous/mux"
"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/pkg/errors"
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"github.com/xenolf/lego/acme"
legolog "github.com/xenolf/lego/log"
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"github.com/xenolf/lego/providers/dns"
)
var (
// OSCPMustStaple enables OSCP stapling as from https://github.com/xenolf/lego/issues/270
OSCPMustStaple = false
provider = &Provider{}
)
// 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."`
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"`
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HTTPChallenge *HTTPChallenge `description:"Activate HTTP-01 Challenge"`
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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"`
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}
// Provider holds configurations of the provider.
type Provider struct {
*Configuration
Store Store
certificates []*Certificate
account *Account
client *acme.Client
certsChan chan *Certificate
configurationChan chan<- types.ConfigMessage
dynamicCerts *safe.Safe
staticCerts map[string]*tls.Certificate
clientMutex sync.Mutex
configFromListenerChan chan types.Configuration
pool *safe.Pool
}
// 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."`
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DelayBeforeCheck flaeg.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."`
}
// HTTPChallenge contains HTTP challenge Configuration
type HTTPChallenge struct {
EntryPoint string `description:"HTTP challenge EntryPoint"`
}
// Get returns the provider instance
func Get() *Provider {
return provider
}
// IsEnabled returns true if the provider instance and its configuration are not nil, otherwise false
func IsEnabled() bool {
return provider != nil && provider.Configuration != nil
}
// SetConfigListenerChan initializes the configFromListenerChan
func (p *Provider) SetConfigListenerChan(configFromListenerChan chan types.Configuration) {
p.configFromListenerChan = configFromListenerChan
}
func (p *Provider) init() error {
if p.ACMELogging {
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legolog.Logger = fmtlog.New(os.Stderr, "legolog: ", fmtlog.LstdFlags)
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} else {
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legolog.Logger = fmtlog.New(ioutil.Discard, "", 0)
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}
var err error
if p.Store == nil {
err = errors.New("no store found for the ACME provider")
return err
}
p.account, err = p.Store.GetAccount()
if err != nil {
return fmt.Errorf("unable to get ACME account : %v", err)
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}
// Reset Account if caServer changed, thus registration URI can be updated
if p.account != nil && p.account.Registration != nil && !strings.HasPrefix(p.account.Registration.URI, p.CAServer) {
p.account = nil
}
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p.certificates, err = p.Store.GetCertificates()
if err != nil {
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return fmt.Errorf("unable to get ACME certificates : %v", err)
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}
p.watchCertificate()
p.watchNewDomains()
return nil
}
func (p *Provider) initAccount() (*Account, error) {
if p.account == nil || len(p.account.Email) == 0 {
var err error
p.account, err = NewAccount(p.Email)
if err != nil {
return nil, err
}
}
return p.account, nil
}
// ListenConfiguration sets a new Configuration into the configFromListenerChan
func (p *Provider) ListenConfiguration(config types.Configuration) {
p.configFromListenerChan <- config
}
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// ListenRequest resolves new certificates for a domain from an incoming request and return a valid Certificate to serve (onDemand option)
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func (p *Provider) ListenRequest(domain string) (*tls.Certificate, error) {
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acmeCert, err := p.resolveCertificate(types.Domain{Main: domain}, false)
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if acmeCert == nil || err != nil {
return nil, err
}
certificate, err := tls.X509KeyPair(acmeCert.Certificate, acmeCert.PrivateKey)
return &certificate, err
}
func (p *Provider) watchNewDomains() {
p.pool.Go(func(stop chan bool) {
for {
select {
case config := <-p.configFromListenerChan:
for _, frontend := range config.Frontends {
for _, route := range frontend.Routes {
domainRules := rules.Rules{}
domains, err := domainRules.ParseDomains(route.Rule)
if err != nil {
log.Errorf("Error parsing domains in provider ACME: %v", err)
continue
}
if len(domains) == 0 {
log.Debugf("No domain parsed in rule %q", route.Rule)
continue
}
log.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() {
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if _, err := p.resolveCertificate(domain, false); err != nil {
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log.Errorf("Unable to obtain ACME certificate for domains %q detected thanks to rule %q : %v", strings.Join(domains, ","), route.Rule, err)
}
})
}
}
}
case <-stop:
return
}
}
})
}
// SetDynamicCertificates allow to initialize dynamicCerts map
func (p *Provider) SetDynamicCertificates(safe *safe.Safe) {
p.dynamicCerts = safe
}
// SetStaticCertificates allow to initialize staticCerts map
func (p *Provider) SetStaticCertificates(staticCerts map[string]*tls.Certificate) {
p.staticCerts = staticCerts
}
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func (p *Provider) resolveCertificate(domain types.Domain, domainFromConfigurationFile bool) (*acme.CertificateResource, error) {
domains, err := p.getValidDomains(domain, domainFromConfigurationFile)
if err != nil {
return nil, err
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}
// Check provided certificates
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uncheckedDomains := p.getUncheckedDomains(domains, !domainFromConfigurationFile)
if len(uncheckedDomains) == 0 {
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return nil, nil
}
log.Debugf("Loading ACME certificates %+v...", uncheckedDomains)
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client, err := p.getClient()
if err != nil {
return nil, fmt.Errorf("cannot get ACME client %v", err)
}
bundle := true
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certificate, err := client.ObtainCertificate(uncheckedDomains, bundle, nil, OSCPMustStaple)
if err != nil {
return nil, fmt.Errorf("cannot obtain certificates: %+v", err)
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}
if len(certificate.Certificate) == 0 || len(certificate.PrivateKey) == 0 {
return nil, fmt.Errorf("domains %v generate certificate with no value: %v", uncheckedDomains, certificate)
}
log.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]}
}
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p.addCertificateForDomain(domain, certificate.Certificate, certificate.PrivateKey)
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return certificate, nil
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}
func (p *Provider) getClient() (*acme.Client, error) {
p.clientMutex.Lock()
defer p.clientMutex.Unlock()
var account *Account
if p.client == nil {
var err error
account, err = p.initAccount()
if err != nil {
return nil, err
}
log.Debug("Building ACME client...")
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caServer := "https://acme-v02.api.letsencrypt.org/directory"
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if len(p.CAServer) > 0 {
caServer = p.CAServer
}
log.Debugf(caServer)
client, err := acme.NewClient(caServer, account, acme.RSA4096)
if err != nil {
return nil, err
}
if account.GetRegistration() == nil {
// New users will need to register; be sure to save it
log.Info("Register...")
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reg, err := client.Register(true)
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if err != nil {
return nil, err
}
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 {
log.Debugf("Using DNS Challenge provider: %s", p.DNSChallenge.Provider)
err = dnsOverrideDelay(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
}
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client.ExcludeChallenges([]acme.Challenge{acme.HTTP01})
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err = client.SetChallengeProvider(acme.DNS01, provider)
if err != nil {
return nil, err
}
} else if p.HTTPChallenge != nil && len(p.HTTPChallenge.EntryPoint) > 0 {
log.Debug("Using HTTP Challenge provider.")
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client.ExcludeChallenges([]acme.Challenge{acme.DNS01})
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err = client.SetChallengeProvider(acme.HTTP01, p)
if err != nil {
return nil, err
}
} else {
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return nil, errors.New("ACME challenge not specified, please select HTTP or DNS Challenge")
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}
p.client = client
}
return p.client, nil
}
// Present presents a challenge to obtain new ACME certificate
func (p *Provider) Present(domain, token, keyAuth string) error {
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return presentHTTPChallenge(domain, token, keyAuth, p.Store)
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}
// CleanUp cleans the challenges when certificate is obtained
func (p *Provider) CleanUp(domain, token, keyAuth string) error {
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return cleanUpHTTPChallenge(domain, token, p.Store)
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}
// Provide allows the file provider to provide configurations to traefik
// using the given Configuration channel.
func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
p.pool = pool
err := p.init()
if err != nil {
return err
}
p.configurationChan = configurationChan
p.refreshCertificates()
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p.deleteUnnecessaryDomains()
for i := 0; i < len(p.Domains); i++ {
domain := p.Domains[i]
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safe.Go(func() {
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if _, err := p.resolveCertificate(domain, true); err != nil {
log.Errorf("Unable to obtain ACME certificate for domains %q : %v", strings.Join(domain.ToStrArray(), ","), err)
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}
})
}
p.renewCertificates()
ticker := time.NewTicker(24 * time.Hour)
pool.Go(func(stop chan bool) {
for {
select {
case <-ticker.C:
p.renewCertificates()
case <-stop:
ticker.Stop()
return
}
}
})
return nil
}
func (p *Provider) addCertificateForDomain(domain types.Domain, certificate []byte, key []byte) {
p.certsChan <- &Certificate{Certificate: certificate, Key: key, Domain: domain}
}
func (p *Provider) watchCertificate() {
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)
}
p.saveCertificates()
case <-stop:
return
}
}
})
}
func (p *Provider) saveCertificates() {
err := p.Store.SaveCertificates(p.certificates)
if err != nil {
log.Error(err)
}
p.refreshCertificates()
}
func (p *Provider) refreshCertificates() {
config := types.ConfigMessage{
ProviderName: "ACME",
Configuration: &types.Configuration{
Backends: map[string]*types.Backend{},
Frontends: map[string]*types.Frontend{},
TLS: []*traefikTLS.Configuration{},
},
}
for _, cert := range p.certificates {
certificate := &traefikTLS.Certificate{CertFile: traefikTLS.FileOrContent(cert.Certificate), KeyFile: traefikTLS.FileOrContent(cert.Key)}
config.Configuration.TLS = append(config.Configuration.TLS, &traefikTLS.Configuration{Certificate: certificate, EntryPoints: []string{p.EntryPoint}})
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}
p.configurationChan <- config
}
// Timeout calculates the maximum of time allowed to resolved an ACME challenge
func (p *Provider) Timeout() (timeout, interval time.Duration) {
return 60 * time.Second, 5 * time.Second
}
func (p *Provider) renewCertificates() {
log.Info("Testing certificate renew...")
for _, certificate := range p.certificates {
crt, err := getX509Certificate(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 {
log.Infof("Error renewing certificate from LE : %+v, %v", certificate.Domain, err)
continue
}
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log.Infof("Renewing certificate from LE : %+v", certificate.Domain)
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renewedCert, err := client.RenewCertificate(acme.CertificateResource{
Domain: certificate.Domain.Main,
PrivateKey: certificate.Key,
Certificate: certificate.Certificate,
}, true, OSCPMustStaple)
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if err != nil {
log.Errorf("Error renewing certificate from LE: %v, %v", certificate.Domain, err)
continue
}
if len(renewedCert.Certificate) == 0 || len(renewedCert.PrivateKey) == 0 {
log.Errorf("domains %v renew certificate with no value: %v", certificate.Domain.ToStrArray(), certificate)
continue
}
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p.addCertificateForDomain(certificate.Domain, renewedCert.Certificate, renewedCert.PrivateKey)
}
}
}
// AddRoutes add routes on internal router
func (p *Provider) AddRoutes(router *mux.Router) {
router.Methods(http.MethodGet).
Path(acme.HTTP01ChallengePath("{token}")).
Handler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
if token, ok := vars["token"]; ok {
domain, _, err := net.SplitHostPort(req.Host)
if err != nil {
log.Debugf("Unable to split host and port: %v. Fallback to request host.", err)
domain = req.Host
}
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tokenValue := getTokenValue(token, domain, p.Store)
if len(tokenValue) > 0 {
rw.WriteHeader(http.StatusOK)
_, err = rw.Write(tokenValue)
if err != nil {
log.Errorf("Unable to write token : %v", err)
}
return
}
}
rw.WriteHeader(http.StatusNotFound)
}))
}
// Get provided certificate which check a domains list (Main and SANs)
// from static and dynamic provided certificates
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func (p *Provider) getUncheckedDomains(domainsToCheck []string, checkConfigurationDomains bool) []string {
log.Debugf("Looking for provided certificate(s) to validate %q...", domainsToCheck)
var allCerts []string
// Get static certificates
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for domains := range p.staticCerts {
allCerts = append(allCerts, domains)
}
// Get dynamic certificates
if p.dynamicCerts != nil && p.dynamicCerts.Get() != nil {
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for domains := range p.dynamicCerts.Get().(map[string]*tls.Certificate) {
allCerts = append(allCerts, domains)
}
}
// Get ACME certificates
for _, certificate := range p.certificates {
allCerts = append(allCerts, strings.Join(certificate.Domain.ToStrArray(), ","))
}
// Get Configuration Domains
if checkConfigurationDomains {
for i := 0; i < len(p.Domains); i++ {
allCerts = append(allCerts, strings.Join(p.Domains[i].ToStrArray(), ","))
}
}
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return searchUncheckedDomains(domainsToCheck, allCerts)
}
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func searchUncheckedDomains(domainsToCheck []string, existentDomains []string) []string {
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var uncheckedDomains []string
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for _, domainToCheck := range domainsToCheck {
if !isDomainAlreadyChecked(domainToCheck, existentDomains) {
uncheckedDomains = append(uncheckedDomains, domainToCheck)
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}
}
if len(uncheckedDomains) == 0 {
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log.Debugf("No ACME certificate to generate for domains %q.", domainsToCheck)
} else {
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log.Debugf("Domains %q need ACME certificates generation for domains %q.", domainsToCheck, strings.Join(uncheckedDomains, ","))
}
return uncheckedDomains
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}
func getX509Certificate(certificate *Certificate) (*x509.Certificate, error) {
var crt *x509.Certificate
tlsCert, err := tls.X509KeyPair(certificate.Certificate, certificate.Key)
if err != nil {
log.Errorf("Failed to load TLS keypair 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 {
log.Errorf("Failed to parse TLS keypair 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
}
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// getValidDomains checks if given domain is allowed to generate a ACME certificate and return it
func (p *Provider) getValidDomains(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, ","))
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}
}
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)
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}
}
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domains = fun.Map(types.CanonicalDomain, domains).([]string)
return domains, nil
}
func isDomainAlreadyChecked(domainToCheck string, existentDomains []string) bool {
for _, certDomains := range existentDomains {
for _, certDomain := range strings.Split(certDomains, ",") {
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if types.MatchDomain(domainToCheck, certDomain) {
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return true
}
}
}
return false
}
// deleteUnnecessaryDomains deletes from the configuration :
// - Duplicated domains
// - Domains which are checked by wildcard domain
func (p *Provider) deleteUnnecessaryDomains() {
var newDomains []types.Domain
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 {
log.Warnf("The domain %v is duplicated in the configuration but will be process by ACME provider only once.", domainToCheck)
keepDomain = false
}
break
}
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// 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
log.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
log.Warnf("Domain %q will not be processed by ACME provider because it is validated by the wildcard %q", domainProcessed, domain.Main)
continue
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}
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
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}
domainToCheck.Set(newDomainsToCheck)
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}
if keepDomain {
newDomains = append(newDomains, domainToCheck)
}
}
p.Domains = newDomains
}