traefik/pkg/tls/tlsmanager.go

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package tls
import (
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"context"
"crypto/tls"
"crypto/x509"
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"errors"
"fmt"
"sync"
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"github.com/containous/traefik/v2/pkg/log"
"github.com/containous/traefik/v2/pkg/tls/generate"
"github.com/containous/traefik/v2/pkg/types"
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"github.com/go-acme/lego/v4/challenge/tlsalpn01"
"github.com/sirupsen/logrus"
)
// DefaultTLSOptions the default TLS options.
var DefaultTLSOptions = Options{}
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// Manager is the TLS option/store/configuration factory.
type Manager struct {
storesConfig map[string]Store
stores map[string]*CertificateStore
configs map[string]Options
certs []*CertAndStores
TLSAlpnGetter func(string) (*tls.Certificate, error)
lock sync.RWMutex
}
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// NewManager creates a new Manager.
func NewManager() *Manager {
return &Manager{
stores: map[string]*CertificateStore{},
configs: map[string]Options{
"default": DefaultTLSOptions,
},
}
}
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// UpdateConfigs updates the TLS* configuration options.
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func (m *Manager) UpdateConfigs(ctx context.Context, stores map[string]Store, configs map[string]Options, certs []*CertAndStores) {
m.lock.Lock()
defer m.lock.Unlock()
m.configs = configs
m.storesConfig = stores
m.certs = certs
m.stores = make(map[string]*CertificateStore)
for storeName, storeConfig := range m.storesConfig {
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ctxStore := log.With(ctx, log.Str(log.TLSStoreName, storeName))
store, err := buildCertificateStore(ctxStore, storeConfig)
if err != nil {
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log.FromContext(ctxStore).Errorf("Error while creating certificate store: %v", err)
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continue
}
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m.stores[storeName] = store
}
storesCertificates := make(map[string]map[string]*tls.Certificate)
for _, conf := range certs {
if len(conf.Stores) == 0 {
if log.GetLevel() >= logrus.DebugLevel {
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log.FromContext(ctx).Debugf("No store is defined to add the certificate %s, it will be added to the default store.",
conf.Certificate.GetTruncatedCertificateName())
}
conf.Stores = []string{"default"}
}
for _, store := range conf.Stores {
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ctxStore := log.With(ctx, log.Str(log.TLSStoreName, store))
if err := conf.Certificate.AppendCertificate(storesCertificates, store); err != nil {
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log.FromContext(ctxStore).Errorf("Unable to append certificate %s to store: %v", conf.Certificate.GetTruncatedCertificateName(), err)
}
}
}
for storeName, certs := range storesCertificates {
m.getStore(storeName).DynamicCerts.Set(certs)
}
}
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// Get gets the TLS configuration to use for a given store / configuration.
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func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
m.lock.RLock()
defer m.lock.RUnlock()
var tlsConfig *tls.Config
var err error
config, ok := m.configs[configName]
if !ok {
err = fmt.Errorf("unknown TLS options: %s", configName)
tlsConfig = &tls.Config{}
}
store := m.getStore(storeName)
if err == nil {
tlsConfig, err = buildTLSConfig(config)
if err != nil {
tlsConfig = &tls.Config{}
}
}
tlsConfig.GetCertificate = func(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
domainToCheck := types.CanonicalDomain(clientHello.ServerName)
if m.TLSAlpnGetter != nil {
cert, err := m.TLSAlpnGetter(domainToCheck)
if err != nil {
return nil, err
}
if cert != nil {
return cert, nil
}
}
bestCertificate := store.GetBestCertificate(clientHello)
if bestCertificate != nil {
return bestCertificate, nil
}
if m.configs[configName].SniStrict {
return nil, fmt.Errorf("strict SNI enabled - No certificate found for domain: %q, closing connection", domainToCheck)
}
log.WithoutContext().Debugf("Serving default certificate for request: %q", domainToCheck)
return store.DefaultCertificate, nil
}
return tlsConfig, err
}
func (m *Manager) getStore(storeName string) *CertificateStore {
_, ok := m.stores[storeName]
if !ok {
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m.stores[storeName], _ = buildCertificateStore(context.Background(), Store{})
}
return m.stores[storeName]
}
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// GetStore gets the certificate store of a given name.
func (m *Manager) GetStore(storeName string) *CertificateStore {
m.lock.RLock()
defer m.lock.RUnlock()
return m.getStore(storeName)
}
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func buildCertificateStore(ctx context.Context, tlsStore Store) (*CertificateStore, error) {
certificateStore := NewCertificateStore()
certificateStore.DynamicCerts.Set(make(map[string]*tls.Certificate))
if tlsStore.DefaultCertificate != nil {
cert, err := buildDefaultCertificate(tlsStore.DefaultCertificate)
if err != nil {
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return certificateStore, err
}
certificateStore.DefaultCertificate = cert
} else {
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log.FromContext(ctx).Debug("No default certificate, generating one")
cert, err := generate.DefaultCertificate()
if err != nil {
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return certificateStore, err
}
certificateStore.DefaultCertificate = cert
}
return certificateStore, nil
}
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// creates a TLS config that allows terminating HTTPS for multiple domains using SNI.
func buildTLSConfig(tlsOption Options) (*tls.Config, error) {
conf := &tls.Config{}
// ensure http2 enabled
conf.NextProtos = []string{"h2", "http/1.1", tlsalpn01.ACMETLS1Protocol}
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if len(tlsOption.ClientAuth.CAFiles) > 0 {
pool := x509.NewCertPool()
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for _, caFile := range tlsOption.ClientAuth.CAFiles {
data, err := caFile.Read()
if err != nil {
return nil, err
}
ok := pool.AppendCertsFromPEM(data)
if !ok {
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if caFile.IsPath() {
return nil, fmt.Errorf("invalid certificate(s) in %s", caFile)
}
return nil, errors.New("invalid certificate(s) content")
}
}
conf.ClientCAs = pool
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conf.ClientAuth = tls.RequireAndVerifyClientCert
}
clientAuthType := tlsOption.ClientAuth.ClientAuthType
if len(clientAuthType) > 0 {
if conf.ClientCAs == nil && (clientAuthType == "VerifyClientCertIfGiven" ||
clientAuthType == "RequireAndVerifyClientCert") {
return nil, fmt.Errorf("invalid clientAuthType: %s, CAFiles is required", clientAuthType)
}
switch clientAuthType {
case "NoClientCert":
conf.ClientAuth = tls.NoClientCert
case "RequestClientCert":
conf.ClientAuth = tls.RequestClientCert
case "RequireAnyClientCert":
conf.ClientAuth = tls.RequireAnyClientCert
case "VerifyClientCertIfGiven":
conf.ClientAuth = tls.VerifyClientCertIfGiven
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case "RequireAndVerifyClientCert":
conf.ClientAuth = tls.RequireAndVerifyClientCert
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default:
return nil, fmt.Errorf("unknown client auth type %q", clientAuthType)
}
}
// Set PreferServerCipherSuites.
conf.PreferServerCipherSuites = tlsOption.PreferServerCipherSuites
// Set the minimum TLS version if set in the config
if minConst, exists := MinVersion[tlsOption.MinVersion]; exists {
conf.PreferServerCipherSuites = true
conf.MinVersion = minConst
}
// Set the maximum TLS version if set in the config TOML
if maxConst, exists := MaxVersion[tlsOption.MaxVersion]; exists {
conf.PreferServerCipherSuites = true
conf.MaxVersion = maxConst
}
// Set the list of CipherSuites if set in the config
if tlsOption.CipherSuites != nil {
// if our list of CipherSuites is defined in the entryPoint config, we can re-initialize the suites list as empty
conf.CipherSuites = make([]uint16, 0)
for _, cipher := range tlsOption.CipherSuites {
if cipherConst, exists := CipherSuites[cipher]; exists {
conf.CipherSuites = append(conf.CipherSuites, cipherConst)
} else {
// CipherSuite listed in the toml does not exist in our listed
return nil, fmt.Errorf("invalid CipherSuite: %s", cipher)
}
}
}
// Set the list of CurvePreferences/CurveIDs if set in the config
if tlsOption.CurvePreferences != nil {
conf.CurvePreferences = make([]tls.CurveID, 0)
// if our list of CurvePreferences/CurveIDs is defined in the config, we can re-initialize the list as empty
for _, curve := range tlsOption.CurvePreferences {
if curveID, exists := CurveIDs[curve]; exists {
conf.CurvePreferences = append(conf.CurvePreferences, curveID)
} else {
// CurveID listed in the toml does not exist in our listed
return nil, fmt.Errorf("invalid CurveID in curvePreferences: %s", curve)
}
}
}
return conf, nil
}
func buildDefaultCertificate(defaultCertificate *Certificate) (*tls.Certificate, error) {
certFile, err := defaultCertificate.CertFile.Read()
if err != nil {
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return nil, fmt.Errorf("failed to get cert file content: %w", err)
}
keyFile, err := defaultCertificate.KeyFile.Read()
if err != nil {
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return nil, fmt.Errorf("failed to get key file content: %w", err)
}
cert, err := tls.X509KeyPair(certFile, keyFile)
if err != nil {
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return nil, fmt.Errorf("failed to load X509 key pair: %w", err)
}
return &cert, nil
}