655 lines
21 KiB
Go
655 lines
21 KiB
Go
package acme
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import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"io/ioutil"
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fmtlog "log"
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"net"
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"net/http"
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"os"
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"regexp"
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"strings"
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"time"
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"github.com/BurntSushi/ty/fun"
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"github.com/cenk/backoff"
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"github.com/containous/flaeg"
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"github.com/containous/mux"
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"github.com/containous/staert"
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"github.com/containous/traefik/cluster"
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"github.com/containous/traefik/log"
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acmeprovider "github.com/containous/traefik/provider/acme"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/tls/generate"
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"github.com/containous/traefik/types"
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"github.com/eapache/channels"
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"github.com/xenolf/lego/acme"
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"github.com/xenolf/lego/providers/dns"
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)
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var (
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// OSCPMustStaple enables OSCP stapling as from https://github.com/xenolf/lego/issues/270
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OSCPMustStaple = false
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)
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// ACME allows to connect to lets encrypt and retrieve certs
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type ACME struct {
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Email string `description:"Email address used for registration"`
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Domains []types.Domain `description:"SANs (alternative domains) to each main domain using format: --acme.domains='main.com,san1.com,san2.com' --acme.domains='main.net,san1.net,san2.net'"`
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Storage string `description:"File or key used for certificates storage."`
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StorageFile string // deprecated
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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
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OnHostRule bool `description:"Enable certificate generation on frontends Host rules."`
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CAServer string `description:"CA server to use."`
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EntryPoint string `description:"Entrypoint to proxy acme challenge to."`
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DNSChallenge *acmeprovider.DNSChallenge `description:"Activate DNS-01 Challenge"`
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HTTPChallenge *acmeprovider.HTTPChallenge `description:"Activate HTTP-01 Challenge"`
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DNSProvider string `description:"Activate DNS-01 Challenge (Deprecated)"` // deprecated
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DelayDontCheckDNS flaeg.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."` // deprecated
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ACMELogging bool `description:"Enable debug logging of ACME actions."`
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client *acme.Client
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defaultCertificate *tls.Certificate
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store cluster.Store
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challengeTLSProvider *challengeTLSProvider
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challengeHTTPProvider *challengeHTTPProvider
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checkOnDemandDomain func(domain string) bool
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jobs *channels.InfiniteChannel
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TLSConfig *tls.Config `description:"TLS config in case wildcard certs are used"`
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dynamicCerts *safe.Safe
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}
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func (a *ACME) init() error {
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// FIXME temporary fix, waiting for https://github.com/xenolf/lego/pull/478
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acme.HTTPClient = http.Client{
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Transport: &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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Dial: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}).Dial,
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TLSHandshakeTimeout: 15 * time.Second,
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ResponseHeaderTimeout: 15 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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},
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}
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if a.ACMELogging {
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acme.Logger = fmtlog.New(os.Stderr, "legolog: ", fmtlog.LstdFlags)
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} else {
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acme.Logger = fmtlog.New(ioutil.Discard, "", 0)
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}
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// no certificates in TLS config, so we add a default one
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cert, err := generate.DefaultCertificate()
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if err != nil {
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return err
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}
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a.defaultCertificate = cert
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a.jobs = channels.NewInfiniteChannel()
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return nil
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}
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// AddRoutes add routes on internal router
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func (a *ACME) AddRoutes(router *mux.Router) {
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router.Methods(http.MethodGet).
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Path(acme.HTTP01ChallengePath("{token}")).
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Handler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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if a.challengeHTTPProvider == nil {
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rw.WriteHeader(http.StatusNotFound)
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return
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}
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vars := mux.Vars(req)
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if token, ok := vars["token"]; ok {
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domain, _, err := net.SplitHostPort(req.Host)
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if err != nil {
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log.Debugf("Unable to split host and port: %v. Fallback to request host.", err)
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domain = req.Host
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}
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tokenValue := a.challengeHTTPProvider.getTokenValue(token, domain)
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if len(tokenValue) > 0 {
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rw.WriteHeader(http.StatusOK)
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rw.Write(tokenValue)
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return
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}
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}
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rw.WriteHeader(http.StatusNotFound)
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}))
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}
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// CreateClusterConfig creates a tls.config using ACME configuration in cluster mode
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func (a *ACME) CreateClusterConfig(leadership *cluster.Leadership, tlsConfig *tls.Config, certs *safe.Safe, checkOnDemandDomain func(domain string) bool) error {
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err := a.init()
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if err != nil {
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return err
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}
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if len(a.Storage) == 0 {
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return errors.New("Empty Store, please provide a key for certs storage")
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}
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a.checkOnDemandDomain = checkOnDemandDomain
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a.dynamicCerts = certs
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tlsConfig.Certificates = append(tlsConfig.Certificates, *a.defaultCertificate)
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tlsConfig.GetCertificate = a.getCertificate
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a.TLSConfig = tlsConfig
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listener := func(object cluster.Object) error {
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account := object.(*Account)
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account.Init()
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if !leadership.IsLeader() {
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a.client, err = a.buildACMEClient(account)
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if err != nil {
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log.Errorf("Error building ACME client %+v: %s", object, err.Error())
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}
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}
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return nil
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}
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datastore, err := cluster.NewDataStore(
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leadership.Pool.Ctx(),
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staert.KvSource{
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Store: leadership.Store,
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Prefix: a.Storage,
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},
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&Account{},
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listener)
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if err != nil {
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return err
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}
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a.store = datastore
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a.challengeTLSProvider = &challengeTLSProvider{store: a.store}
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ticker := time.NewTicker(24 * time.Hour)
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leadership.Pool.AddGoCtx(func(ctx context.Context) {
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log.Info("Starting ACME renew job...")
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defer log.Info("Stopped ACME renew job...")
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for {
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select {
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case <-ctx.Done():
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return
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case <-ticker.C:
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a.renewCertificates()
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}
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}
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})
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leadership.AddListener(a.leadershipListener)
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return nil
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}
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func (a *ACME) leadershipListener(elected bool) error {
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if elected {
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_, err := a.store.Load()
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if err != nil {
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return err
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}
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transaction, object, err := a.store.Begin()
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if err != nil {
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return err
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}
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account := object.(*Account)
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account.Init()
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var needRegister bool
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if account == nil || len(account.Email) == 0 {
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account, err = NewAccount(a.Email)
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if err != nil {
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return err
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}
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needRegister = true
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}
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a.client, err = a.buildACMEClient(account)
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if err != nil {
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return err
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}
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if needRegister {
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// New users will need to register; be sure to save it
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log.Debug("Register...")
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reg, err := a.client.Register()
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if err != nil {
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return err
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}
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account.Registration = reg
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}
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// The client has a URL to the current Let's Encrypt Subscriber
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// Agreement. The user will need to agree to it.
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log.Debug("AgreeToTOS...")
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err = a.client.AgreeToTOS()
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if err != nil {
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log.Debug(err)
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// Let's Encrypt Subscriber Agreement renew ?
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reg, err := a.client.QueryRegistration()
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if err != nil {
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return err
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}
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account.Registration = reg
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err = a.client.AgreeToTOS()
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if err != nil {
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log.Errorf("Error sending ACME agreement to TOS: %+v: %s", account, err.Error())
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}
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}
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err = transaction.Commit(account)
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if err != nil {
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return err
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}
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a.retrieveCertificates()
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a.renewCertificates()
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a.runJobs()
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}
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return nil
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}
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func (a *ACME) getCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
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domain := types.CanonicalDomain(clientHello.ServerName)
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account := a.store.Get().(*Account)
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if providedCertificate := a.getProvidedCertificate(domain); providedCertificate != nil {
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return providedCertificate, nil
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}
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if challengeCert, ok := a.challengeTLSProvider.getCertificate(domain); ok {
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log.Debugf("ACME got challenge %s", domain)
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return challengeCert, nil
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}
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if domainCert, ok := account.DomainsCertificate.getCertificateForDomain(domain); ok {
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log.Debugf("ACME got domain cert %s", domain)
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return domainCert.tlsCert, nil
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}
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if a.OnDemand {
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if a.checkOnDemandDomain != nil && !a.checkOnDemandDomain(domain) {
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return nil, nil
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}
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return a.loadCertificateOnDemand(clientHello)
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}
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log.Debugf("No certificate found or generated for %s", domain)
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return nil, nil
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}
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func (a *ACME) retrieveCertificates() {
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a.jobs.In() <- func() {
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log.Info("Retrieving ACME certificates...")
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for _, domain := range a.Domains {
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// check if cert isn't already loaded
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account := a.store.Get().(*Account)
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if _, exists := account.DomainsCertificate.exists(domain); !exists {
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domains := []string{}
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domains = append(domains, domain.Main)
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domains = append(domains, domain.SANs...)
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certificateResource, err := a.getDomainsCertificates(domains)
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if err != nil {
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log.Errorf("Error getting ACME certificate for domain %s: %s", domains, err.Error())
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continue
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}
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transaction, object, err := a.store.Begin()
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if err != nil {
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log.Errorf("Error creating ACME store transaction from domain %s: %s", domain, err.Error())
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continue
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}
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account = object.(*Account)
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_, err = account.DomainsCertificate.addCertificateForDomains(certificateResource, domain)
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if err != nil {
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log.Errorf("Error adding ACME certificate for domain %s: %s", domains, err.Error())
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continue
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}
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if err = transaction.Commit(account); err != nil {
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log.Errorf("Error Saving ACME account %+v: %s", account, err.Error())
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continue
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}
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}
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}
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log.Info("Retrieved ACME certificates")
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}
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}
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func (a *ACME) renewCertificates() {
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a.jobs.In() <- func() {
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log.Info("Testing certificate renew...")
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account := a.store.Get().(*Account)
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for _, certificateResource := range account.DomainsCertificate.Certs {
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if certificateResource.needRenew() {
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log.Infof("Renewing certificate from LE : %+v", certificateResource.Domains)
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renewedACMECert, err := a.renewACMECertificate(certificateResource)
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if err != nil {
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log.Errorf("Error renewing certificate from LE: %v", err)
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continue
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}
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operation := func() error {
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return a.storeRenewedCertificate(certificateResource, renewedACMECert)
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}
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notify := func(err error, time time.Duration) {
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log.Warnf("Renewed certificate storage error: %v, retrying in %s", err, time)
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}
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ebo := backoff.NewExponentialBackOff()
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ebo.MaxElapsedTime = 60 * time.Second
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err = backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
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if err != nil {
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log.Errorf("Datastore cannot sync: %v", err)
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continue
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}
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}
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}
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}
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}
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func (a *ACME) renewACMECertificate(certificateResource *DomainsCertificate) (*Certificate, error) {
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renewedCert, err := a.client.RenewCertificate(acme.CertificateResource{
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Domain: certificateResource.Certificate.Domain,
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CertURL: certificateResource.Certificate.CertURL,
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CertStableURL: certificateResource.Certificate.CertStableURL,
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PrivateKey: certificateResource.Certificate.PrivateKey,
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Certificate: certificateResource.Certificate.Certificate,
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}, true, OSCPMustStaple)
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if err != nil {
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return nil, err
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}
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log.Infof("Renewed certificate from LE: %+v", certificateResource.Domains)
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return &Certificate{
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Domain: renewedCert.Domain,
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CertURL: renewedCert.CertURL,
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CertStableURL: renewedCert.CertStableURL,
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PrivateKey: renewedCert.PrivateKey,
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Certificate: renewedCert.Certificate,
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}, nil
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}
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func (a *ACME) storeRenewedCertificate(certificateResource *DomainsCertificate, renewedACMECert *Certificate) error {
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transaction, object, err := a.store.Begin()
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if err != nil {
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return fmt.Errorf("error during transaction initialization for renewing certificate: %v", err)
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}
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log.Infof("Renewing certificate in data store : %+v ", certificateResource.Domains)
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account := object.(*Account)
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err = account.DomainsCertificate.renewCertificates(renewedACMECert, certificateResource.Domains)
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if err != nil {
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return fmt.Errorf("error renewing certificate in datastore: %v ", err)
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}
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log.Infof("Commit certificate renewed in data store : %+v", certificateResource.Domains)
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if err = transaction.Commit(account); err != nil {
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return fmt.Errorf("error saving ACME account %+v: %v", account, err)
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}
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oldAccount := a.store.Get().(*Account)
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for _, oldCertificateResource := range oldAccount.DomainsCertificate.Certs {
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if oldCertificateResource.Domains.Main == certificateResource.Domains.Main && strings.Join(oldCertificateResource.Domains.SANs, ",") == strings.Join(certificateResource.Domains.SANs, ",") && certificateResource.Certificate != renewedACMECert {
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return fmt.Errorf("renewed certificate not stored: %+v", certificateResource.Domains)
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}
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}
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log.Infof("Certificate successfully renewed in data store: %+v", certificateResource.Domains)
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return nil
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}
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func dnsOverrideDelay(delay flaeg.Duration) error {
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var err error
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if delay > 0 {
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log.Debugf("Delaying %d rather than validating DNS propagation", delay)
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acme.PreCheckDNS = func(_, _ string) (bool, error) {
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time.Sleep(time.Duration(delay))
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return true, nil
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}
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} else if delay < 0 {
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err = fmt.Errorf("invalid negative DelayBeforeCheck: %d", delay)
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}
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return err
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}
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func (a *ACME) buildACMEClient(account *Account) (*acme.Client, error) {
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log.Debug("Building ACME client...")
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caServer := "https://acme-v01.api.letsencrypt.org/directory"
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if len(a.CAServer) > 0 {
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caServer = a.CAServer
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}
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client, err := acme.NewClient(caServer, account, acme.RSA4096)
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if err != nil {
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return nil, err
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}
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if a.DNSChallenge != nil && len(a.DNSChallenge.Provider) > 0 {
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log.Debugf("Using DNS Challenge provider: %s", a.DNSChallenge.Provider)
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err = dnsOverrideDelay(a.DNSChallenge.DelayBeforeCheck)
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if err != nil {
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return nil, err
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}
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var provider acme.ChallengeProvider
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provider, err = dns.NewDNSChallengeProviderByName(a.DNSChallenge.Provider)
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if err != nil {
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return nil, err
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}
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client.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.TLSSNI01})
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err = client.SetChallengeProvider(acme.DNS01, provider)
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} else if a.HTTPChallenge != nil && len(a.HTTPChallenge.EntryPoint) > 0 {
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log.Debug("Using HTTP Challenge provider.")
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client.ExcludeChallenges([]acme.Challenge{acme.DNS01, acme.TLSSNI01})
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a.challengeHTTPProvider = &challengeHTTPProvider{store: a.store}
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err = client.SetChallengeProvider(acme.HTTP01, a.challengeHTTPProvider)
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} else {
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log.Debug("Using TLS Challenge provider.")
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client.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.DNS01})
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err = client.SetChallengeProvider(acme.TLSSNI01, a.challengeTLSProvider)
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}
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if err != nil {
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return nil, err
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}
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return client, nil
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}
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func (a *ACME) loadCertificateOnDemand(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
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domain := types.CanonicalDomain(clientHello.ServerName)
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account := a.store.Get().(*Account)
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if certificateResource, ok := account.DomainsCertificate.getCertificateForDomain(domain); ok {
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return certificateResource.tlsCert, nil
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}
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certificate, err := a.getDomainsCertificates([]string{domain})
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if err != nil {
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return nil, err
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}
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log.Debugf("Got certificate on demand for domain %s", domain)
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transaction, object, err := a.store.Begin()
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if err != nil {
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return nil, err
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}
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account = object.(*Account)
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cert, err := account.DomainsCertificate.addCertificateForDomains(certificate, types.Domain{Main: domain})
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if err != nil {
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return nil, err
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}
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if err = transaction.Commit(account); err != nil {
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return nil, err
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}
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return cert.tlsCert, nil
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}
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// LoadCertificateForDomains loads certificates from ACME for given domains
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func (a *ACME) LoadCertificateForDomains(domains []string) {
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a.jobs.In() <- func() {
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log.Debugf("LoadCertificateForDomains %v...", domains)
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if len(domains) == 0 {
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// no domain
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return
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}
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domains = fun.Map(types.CanonicalDomain, domains).([]string)
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operation := func() error {
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if a.client == nil {
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return errors.New("ACME client still not built")
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}
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return nil
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}
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notify := func(err error, time time.Duration) {
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log.Errorf("Error getting ACME client: %v, retrying in %s", err, time)
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}
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ebo := backoff.NewExponentialBackOff()
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ebo.MaxElapsedTime = 30 * time.Second
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
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if err != nil {
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log.Errorf("Error getting ACME client: %v", err)
|
|
return
|
|
}
|
|
account := a.store.Get().(*Account)
|
|
|
|
// Check provided certificates
|
|
uncheckedDomains := a.getUncheckedDomains(domains, account)
|
|
if len(uncheckedDomains) == 0 {
|
|
return
|
|
}
|
|
certificate, err := a.getDomainsCertificates(uncheckedDomains)
|
|
if err != nil {
|
|
log.Errorf("Error getting ACME certificates %+v : %v", uncheckedDomains, err)
|
|
return
|
|
}
|
|
log.Debugf("Got certificate for domains %+v", uncheckedDomains)
|
|
transaction, object, err := a.store.Begin()
|
|
|
|
if err != nil {
|
|
log.Errorf("Error creating transaction %+v : %v", uncheckedDomains, err)
|
|
return
|
|
}
|
|
var domain types.Domain
|
|
if len(uncheckedDomains) > 1 {
|
|
domain = types.Domain{Main: uncheckedDomains[0], SANs: uncheckedDomains[1:]}
|
|
} else {
|
|
domain = types.Domain{Main: uncheckedDomains[0]}
|
|
}
|
|
account = object.(*Account)
|
|
_, err = account.DomainsCertificate.addCertificateForDomains(certificate, domain)
|
|
if err != nil {
|
|
log.Errorf("Error adding ACME certificates %+v : %v", uncheckedDomains, err)
|
|
return
|
|
}
|
|
if err = transaction.Commit(account); err != nil {
|
|
log.Errorf("Error Saving ACME account %+v: %v", account, err)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get provided certificate which check a domains list (Main and SANs)
|
|
// from static and dynamic provided certificates
|
|
func (a *ACME) getProvidedCertificate(domains string) *tls.Certificate {
|
|
log.Debugf("Looking for provided certificate to validate %s...", domains)
|
|
cert := searchProvidedCertificateForDomains(domains, a.TLSConfig.NameToCertificate)
|
|
if cert == nil && a.dynamicCerts != nil && a.dynamicCerts.Get() != nil {
|
|
cert = searchProvidedCertificateForDomains(domains, a.dynamicCerts.Get().(map[string]*tls.Certificate))
|
|
}
|
|
if cert == nil {
|
|
log.Debugf("No provided certificate found for domains %s, get ACME certificate.", domains)
|
|
}
|
|
return cert
|
|
}
|
|
|
|
func searchProvidedCertificateForDomains(domain string, certs map[string]*tls.Certificate) *tls.Certificate {
|
|
// Use regex to test for provided certs that might have been added into TLSConfig
|
|
for certDomains := range certs {
|
|
domainCheck := false
|
|
for _, certDomain := range strings.Split(certDomains, ",") {
|
|
selector := "^" + strings.Replace(certDomain, "*.", "[^\\.]*\\.?", -1) + "$"
|
|
domainCheck, _ = regexp.MatchString(selector, domain)
|
|
if domainCheck {
|
|
break
|
|
}
|
|
}
|
|
if domainCheck {
|
|
log.Debugf("Domain %q checked by provided certificate %q", domain, certDomains)
|
|
return certs[certDomains]
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Get provided certificate which check a domains list (Main and SANs)
|
|
// from static and dynamic provided certificates
|
|
func (a *ACME) getUncheckedDomains(domains []string, account *Account) []string {
|
|
log.Debugf("Looking for provided certificate to validate %s...", domains)
|
|
allCerts := make(map[string]*tls.Certificate)
|
|
|
|
// Get static certificates
|
|
for domains, certificate := range a.TLSConfig.NameToCertificate {
|
|
allCerts[domains] = certificate
|
|
}
|
|
|
|
// Get dynamic certificates
|
|
if a.dynamicCerts != nil && a.dynamicCerts.Get() != nil {
|
|
for domains, certificate := range a.dynamicCerts.Get().(map[string]*tls.Certificate) {
|
|
allCerts[domains] = certificate
|
|
}
|
|
}
|
|
|
|
// Get ACME certificates
|
|
if account != nil {
|
|
for domains, certificate := range account.DomainsCertificate.toDomainsMap() {
|
|
allCerts[domains] = certificate
|
|
}
|
|
}
|
|
|
|
return searchUncheckedDomains(domains, allCerts)
|
|
}
|
|
|
|
func searchUncheckedDomains(domains []string, certs map[string]*tls.Certificate) []string {
|
|
uncheckedDomains := []string{}
|
|
for _, domainToCheck := range domains {
|
|
domainCheck := false
|
|
for certDomains := range certs {
|
|
domainCheck = false
|
|
for _, certDomain := range strings.Split(certDomains, ",") {
|
|
// Use regex to test for provided certs that might have been added into TLSConfig
|
|
selector := "^" + strings.Replace(certDomain, "*.", "[^\\.]*\\.?", -1) + "$"
|
|
domainCheck, _ = regexp.MatchString(selector, domainToCheck)
|
|
if domainCheck {
|
|
break
|
|
}
|
|
}
|
|
if domainCheck {
|
|
break
|
|
}
|
|
}
|
|
if !domainCheck {
|
|
uncheckedDomains = append(uncheckedDomains, domainToCheck)
|
|
}
|
|
}
|
|
if len(uncheckedDomains) == 0 {
|
|
log.Debugf("No ACME certificate to generate for domains %q.", domains)
|
|
} else {
|
|
log.Debugf("Domains %q need ACME certificates generation for domains %q.", domains, strings.Join(uncheckedDomains, ","))
|
|
}
|
|
return uncheckedDomains
|
|
}
|
|
|
|
func (a *ACME) getDomainsCertificates(domains []string) (*Certificate, error) {
|
|
domains = fun.Map(types.CanonicalDomain, domains).([]string)
|
|
log.Debugf("Loading ACME certificates %s...", domains)
|
|
bundle := true
|
|
certificate, failures := a.client.ObtainCertificate(domains, bundle, nil, OSCPMustStaple)
|
|
if len(failures) > 0 {
|
|
log.Error(failures)
|
|
return nil, fmt.Errorf("cannot obtain certificates %+v", failures)
|
|
}
|
|
log.Debugf("Loaded ACME certificates %s", domains)
|
|
return &Certificate{
|
|
Domain: certificate.Domain,
|
|
CertURL: certificate.CertURL,
|
|
CertStableURL: certificate.CertStableURL,
|
|
PrivateKey: certificate.PrivateKey,
|
|
Certificate: certificate.Certificate,
|
|
}, nil
|
|
}
|
|
|
|
func (a *ACME) runJobs() {
|
|
safe.Go(func() {
|
|
for job := range a.jobs.Out() {
|
|
function := job.(func())
|
|
function()
|
|
}
|
|
})
|
|
}
|