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@ -23,6 +23,7 @@ import ( |
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"crypto/x509" |
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"crypto/x509/pkix" |
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"encoding/asn1" |
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"encoding/json" |
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"fmt" |
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weakrand "math/rand" |
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"net" |
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@ -31,7 +32,9 @@ import ( |
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"time" |
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"github.com/mholt/acmez" |
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"github.com/mholt/acmez/acme" |
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"go.uber.org/zap" |
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"golang.org/x/net/idna" |
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) |
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// Config configures a certificate manager instance.
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@ -54,45 +57,48 @@ type Config struct { |
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// DefaultServerName specifies a server name
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// to use when choosing a certificate if the
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// ClientHello's ServerName field is empty
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// ClientHello's ServerName field is empty.
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DefaultServerName string |
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// The state needed to operate on-demand TLS;
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// if non-nil, on-demand TLS is enabled and
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// certificate operations are deferred to
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// TLS handshakes (or as-needed)
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// TLS handshakes (or as-needed).
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// TODO: Can we call this feature "Reactive/Lazy/Passive TLS" instead?
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OnDemand *OnDemandConfig |
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// Add the must staple TLS extension to the CSR
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// Adds the must staple TLS extension to the CSR.
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MustStaple bool |
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// The type that issues certificates; the
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// default Issuer is ACMEManager
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Issuer Issuer |
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// The type that revokes certificates; must
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// be configured in conjunction with the Issuer
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// field such that both the Issuer and Revoker
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// are related (because issuance information is
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// required for revocation)
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Revoker Revoker |
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// The source for getting new certificates; the
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// default Issuer is ACMEManager. If multiple
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// issuers are specified, they will be tried in
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// turn until one succeeds.
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Issuers []Issuer |
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// The source of new private keys for certificates;
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// the default KeySource is StandardKeyGenerator
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// the default KeySource is StandardKeyGenerator.
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KeySource KeyGenerator |
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// CertSelection chooses one of the certificates
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// with which the ClientHello will be completed;
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// if not set, DefaultCertificateSelector will
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// be used
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// be used.
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CertSelection CertificateSelector |
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// The storage to access when storing or
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// loading TLS assets
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// OCSP configures how OCSP is handled. By default,
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// OCSP responses are fetched for every certificate
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// with a responder URL, and cached on disk. Changing
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// these defaults is STRONGLY discouraged unless you
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// have a compelling reason to put clients at greater
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// risk and reduce their privacy.
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OCSP OCSPConfig |
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// The storage to access when storing or loading
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// TLS assets. Default is the local file system.
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Storage Storage |
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// Set a logger to enable logging
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// Set a logger to enable logging.
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Logger *zap.Logger |
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// required pointer to the in-memory cert cache
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@ -116,6 +122,9 @@ type Config struct { |
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// same, default certificate cache. All configs returned
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// by NewDefault() are based on the values of the fields of
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// Default at the time it is called.
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//
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// This is the only way to get a config that uses the
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// default certificate cache.
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func NewDefault() *Config { |
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defaultCacheMu.Lock() |
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if defaultCache == nil { |
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@ -153,7 +162,7 @@ func NewDefault() *Config { |
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// the vast majority of cases, there will be only a
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// single Config, thus the default cache (which always
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// uses the default Config) and default config will
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// suffice, and you should use New() instead.
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// suffice, and you should use NewDefault() instead.
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func New(certCache *Cache, cfg Config) *Config { |
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if certCache == nil { |
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panic("a certificate cache is required") |
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@ -196,23 +205,11 @@ func newWithCache(certCache *Cache, cfg Config) *Config { |
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if cfg.Storage == nil { |
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cfg.Storage = Default.Storage |
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} |
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if cfg.Issuer == nil { |
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cfg.Issuer = Default.Issuer |
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if cfg.Issuer == nil { |
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// okay really, we need an issuer,
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// that's kind of the point; most
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// people would probably want ACME
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cfg.Issuer = NewACMEManager(&cfg, DefaultACME) |
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} |
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// issuer and revoker go together; if user
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// specifies their own issuer, we don't want
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// to override their revoker, hence we only
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// do this if Issuer was also nil
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if cfg.Revoker == nil { |
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cfg.Revoker = Default.Revoker |
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if cfg.Revoker == nil { |
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cfg.Revoker = NewACMEManager(&cfg, DefaultACME) |
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} |
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if len(cfg.Issuers) == 0 { |
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cfg.Issuers = Default.Issuers |
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if len(cfg.Issuers) == 0 { |
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// at least one issuer is absolutely required
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cfg.Issuers = []Issuer{NewACMEManager(&cfg, DefaultACME)} |
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} |
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} |
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@ -223,7 +220,6 @@ func newWithCache(certCache *Cache, cfg Config) *Config { |
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cfg.Storage = defaultFileStorage |
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} |
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// ensure the unexported fields are valid
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cfg.certCache = certCache |
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return &cfg |
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@ -254,6 +250,29 @@ func (cfg *Config) ManageSync(domainNames []string) error { |
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return cfg.manageAll(nil, domainNames, false) |
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} |
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// ClientCredentials returns a list of TLS client certificate chains for the given identifiers.
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// The return value can be used in a tls.Config to enable client authentication using managed certificates.
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// Any certificates that need to be obtained or renewed for these identifiers will be managed accordingly.
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func (cfg *Config) ClientCredentials(ctx context.Context, identifiers []string) ([]tls.Certificate, error) { |
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err := cfg.manageAll(ctx, identifiers, false) |
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if err != nil { |
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return nil, err |
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} |
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var chains []tls.Certificate |
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for _, id := range identifiers { |
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certRes, err := cfg.loadCertResourceAnyIssuer(id) |
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if err != nil { |
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return chains, err |
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} |
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chain, err := tls.X509KeyPair(certRes.CertificatePEM, certRes.PrivateKeyPEM) |
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if err != nil { |
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return chains, err |
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} |
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chains = append(chains, chain) |
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} |
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return chains, nil |
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} |
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// ManageAsync is the same as ManageSync, except that ACME
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// operations are performed asynchronously (in the background).
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// This method returns before certificates are ready. It is
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@ -360,6 +379,28 @@ func (cfg *Config) manageOne(ctx context.Context, domainName string, async bool) |
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return nil |
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} |
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// Unmanage causes the certificates for domainNames to stop being managed.
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// If there are certificates for the supplied domain names in the cache, they
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// are evicted from the cache.
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func (cfg *Config) Unmanage(domainNames []string) { |
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var deleteQueue []Certificate |
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for _, domainName := range domainNames { |
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certs := cfg.certCache.AllMatchingCertificates(domainName) |
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for _, cert := range certs { |
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if !cert.managed { |
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continue |
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} |
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deleteQueue = append(deleteQueue, cert) |
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} |
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} |
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cfg.certCache.mu.Lock() |
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for _, cert := range deleteQueue { |
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cfg.certCache.removeCertificate(cert) |
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} |
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cfg.certCache.mu.Unlock() |
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} |
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// ObtainCert obtains a certificate for name using cfg, as long
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// as a certificate does not already exist in storage for that
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// name. The name must qualify and cfg must be flagged as Managed.
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@ -372,27 +413,22 @@ func (cfg *Config) manageOne(ctx context.Context, domainName string, async bool) |
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// TODO: consider moving interactive param into the Config struct,
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// and maybe retry settings into the Config struct as well? (same for RenewCert)
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func (cfg *Config) ObtainCert(ctx context.Context, name string, interactive bool) error { |
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if cfg.storageHasCertResources(name) { |
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return nil |
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} |
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issuer, err := cfg.getPrecheckedIssuer(ctx, []string{name}, interactive) |
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if err != nil { |
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return err |
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if len(cfg.Issuers) == 0 { |
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return fmt.Errorf("no issuers configured; impossible to obtain or check for existing certificate in storage") |
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} |
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if issuer == nil { |
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if cfg.storageHasCertResourcesAnyIssuer(name) { |
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return nil |
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} |
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return cfg.obtainWithIssuer(ctx, issuer, name, interactive) |
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} |
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func loggerNamed(l *zap.Logger, name string) *zap.Logger { |
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if l == nil { |
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return nil |
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// ensure storage is writeable and readable
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// TODO: this is not necessary every time; should only perform check once every so often for each storage, which may require some global state...
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err := cfg.checkStorage() |
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if err != nil { |
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return fmt.Errorf("failed storage check: %v - storage is probably misconfigured", err) |
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} |
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return l.Named(name) |
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return cfg.obtainCert(ctx, name, interactive) |
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} |
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func (cfg *Config) obtainWithIssuer(ctx context.Context, issuer Issuer, name string, interactive bool) error { |
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func (cfg *Config) obtainCert(ctx context.Context, name string, interactive bool) error { |
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log := loggerNamed(cfg.Logger, "obtain") |
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if log != nil { |
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@ -400,10 +436,10 @@ func (cfg *Config) obtainWithIssuer(ctx context.Context, issuer Issuer, name str |
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} |
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// ensure idempotency of the obtain operation for this name
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lockKey := cfg.lockKey("cert_acme", name) |
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lockKey := cfg.lockKey(certIssueLockOp, name) |
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err := acquireLock(ctx, cfg.Storage, lockKey) |
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if err != nil { |
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return err |
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return fmt.Errorf("unable to acquire lock '%s': %v", lockKey, err) |
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} |
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defer func() { |
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if log != nil { |
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@ -424,7 +460,7 @@ func (cfg *Config) obtainWithIssuer(ctx context.Context, issuer Issuer, name str |
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f := func(ctx context.Context) error { |
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// check if obtain is still needed -- might have been obtained during lock
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if cfg.storageHasCertResources(name) { |
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if cfg.storageHasCertResourcesAnyIssuer(name) { |
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if log != nil { |
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log.Info("certificate already exists in storage", zap.String("identifier", name)) |
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} |
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@ -445,8 +481,24 @@ func (cfg *Config) obtainWithIssuer(ctx context.Context, issuer Issuer, name str |
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return err |
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} |
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issuedCert, err := issuer.Issue(ctx, csr) |
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// try to obtain from each issuer until we succeed
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var issuedCert *IssuedCertificate |
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var issuerUsed Issuer |
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for _, issuer := range cfg.Issuers { |
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if prechecker, ok := issuer.(PreChecker); ok { |
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err = prechecker.PreCheck(ctx, []string{name}, interactive) |
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if err != nil { |
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continue |
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} |
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} |
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issuedCert, err = issuer.Issue(ctx, csr) |
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if err == nil { |
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issuerUsed = issuer |
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break |
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} |
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} |
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if err != nil { |
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// TODO: only the error from the last issuer will be returned, oh well?
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return fmt.Errorf("[%s] Obtain: %w", name, err) |
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} |
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@ -457,7 +509,7 @@ func (cfg *Config) obtainWithIssuer(ctx context.Context, issuer Issuer, name str |
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PrivateKeyPEM: privKeyPEM, |
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IssuerData: issuedCert.Metadata, |
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} |
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err = cfg.saveCertResource(certRes) |
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err = cfg.saveCertResource(issuerUsed, certRes) |
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if err != nil { |
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return fmt.Errorf("[%s] Obtain: saving assets: %v", name, err) |
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} |
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@ -480,21 +532,32 @@ func (cfg *Config) obtainWithIssuer(ctx context.Context, issuer Issuer, name str |
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return err |
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} |
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func (cfg *Config) storageHasCertResourcesAnyIssuer(name string) bool { |
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for _, iss := range cfg.Issuers { |
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if cfg.storageHasCertResources(iss, name) { |
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return true |
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} |
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} |
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return false |
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} |
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// RenewCert renews the certificate for name using cfg. It stows the
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// renewed certificate and its assets in storage if successful. It
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// DOES NOT update the in-memory cache with the new certificate.
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func (cfg *Config) RenewCert(ctx context.Context, name string, interactive bool) error { |
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issuer, err := cfg.getPrecheckedIssuer(ctx, []string{name}, interactive) |
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if err != nil { |
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return err |
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if len(cfg.Issuers) == 0 { |
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return fmt.Errorf("no issuers configured; impossible to renew or check existing certificate in storage") |
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} |
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if issuer == nil { |
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return nil |
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// ensure storage is writeable and readable
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// TODO: this is not necessary every time; should only perform check once every so often for each storage, which may require some global state...
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err := cfg.checkStorage() |
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if err != nil { |
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return fmt.Errorf("failed storage check: %v - storage is probably misconfigured", err) |
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} |
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return cfg.renewWithIssuer(ctx, issuer, name, interactive) |
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return cfg.renewCert(ctx, name, interactive) |
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} |
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func (cfg *Config) renewWithIssuer(ctx context.Context, issuer Issuer, name string, interactive bool) error { |
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func (cfg *Config) renewCert(ctx context.Context, name string, interactive bool) error { |
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log := loggerNamed(cfg.Logger, "renew") |
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if log != nil { |
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@ -502,10 +565,10 @@ func (cfg *Config) renewWithIssuer(ctx context.Context, issuer Issuer, name stri |
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} |
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// ensure idempotency of the renew operation for this name
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lockKey := cfg.lockKey("cert_acme", name) |
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lockKey := cfg.lockKey(certIssueLockOp, name) |
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err := acquireLock(ctx, cfg.Storage, lockKey) |
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if err != nil { |
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return err |
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return fmt.Errorf("unable to acquire lock '%s': %v", lockKey, err) |
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} |
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defer func() { |
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if log != nil { |
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@ -526,7 +589,7 @@ func (cfg *Config) renewWithIssuer(ctx context.Context, issuer Issuer, name stri |
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f := func(ctx context.Context) error { |
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// prepare for renewal (load PEM cert, key, and meta)
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certRes, err := cfg.loadCertResource(name) |
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certRes, err := cfg.loadCertResourceAnyIssuer(name) |
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if err != nil { |
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return err |
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} |
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@ -556,8 +619,24 @@ func (cfg *Config) renewWithIssuer(ctx context.Context, issuer Issuer, name stri |
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return err |
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} |
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issuedCert, err := issuer.Issue(ctx, csr) |
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// try to obtain from each issuer until we succeed
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var issuedCert *IssuedCertificate |
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var issuerUsed Issuer |
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for _, issuer := range cfg.Issuers { |
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if prechecker, ok := issuer.(PreChecker); ok { |
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err = prechecker.PreCheck(ctx, []string{name}, interactive) |
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if err != nil { |
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continue |
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} |
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} |
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issuedCert, err = issuer.Issue(ctx, csr) |
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if err == nil { |
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issuerUsed = issuer |
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break |
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} |
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} |
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if err != nil { |
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// TODO: only the error from the last issuer will be returned, oh well?
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return fmt.Errorf("[%s] Renew: %w", name, err) |
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} |
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@ -568,7 +647,7 @@ func (cfg *Config) renewWithIssuer(ctx context.Context, issuer Issuer, name stri |
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PrivateKeyPEM: certRes.PrivateKeyPEM, |
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IssuerData: issuedCert.Metadata, |
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} |
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err = cfg.saveCertResource(newCertRes) |
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err = cfg.saveCertResource(issuerUsed, newCertRes) |
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if err != nil { |
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return fmt.Errorf("[%s] Renew: saving assets: %v", name, err) |
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} |
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@ -602,7 +681,12 @@ func (cfg *Config) generateCSR(privateKey crypto.PrivateKey, sans []string) (*x5 |
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} else if u, err := url.Parse(name); err == nil && strings.Contains(name, "/") { |
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csrTemplate.URIs = append(csrTemplate.URIs, u) |
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} else { |
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csrTemplate.DNSNames = append(csrTemplate.DNSNames, name) |
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// convert IDNs to ASCII according to RFC 5280 section 7
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normalizedName, err := idna.ToASCII(name) |
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if err != nil { |
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return nil, fmt.Errorf("converting identifier '%s' to ASCII: %v", name, err) |
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} |
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csrTemplate.DNSNames = append(csrTemplate.DNSNames, normalizedName) |
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} |
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} |
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@ -619,28 +703,29 @@ func (cfg *Config) generateCSR(privateKey crypto.PrivateKey, sans []string) (*x5 |
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} |
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// RevokeCert revokes the certificate for domain via ACME protocol. It requires
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// that cfg.Issuer is properly configured with the same issuer that issued the
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// that cfg.Issuers is properly configured with the same issuer that issued the
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// certificate being revoked. See RFC 5280 §5.3.1 for reason codes.
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func (cfg *Config) RevokeCert(ctx context.Context, domain string, reason int, interactive bool) error { |
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rev := cfg.Revoker |
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if rev == nil { |
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rev = Default.Revoker |
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for i, issuer := range cfg.Issuers { |
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issuerKey := issuer.IssuerKey() |
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rev, ok := issuer.(Revoker) |
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if !ok { |
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return fmt.Errorf("issuer %d (%s) is not a Revoker", i, issuerKey) |
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} |
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certRes, err := cfg.loadCertResource(domain) |
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certRes, err := cfg.loadCertResource(issuer, domain) |
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if err != nil { |
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return err |
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} |
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issuerKey := cfg.Issuer.IssuerKey() |
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if !cfg.Storage.Exists(StorageKeys.SitePrivateKey(issuerKey, domain)) { |
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return fmt.Errorf("private key not found for %s", certRes.SANs) |
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} |
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err = rev.Revoke(ctx, certRes, reason) |
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if err != nil { |
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return err |
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return fmt.Errorf("issuer %d (%s): %v", i, issuerKey, err) |
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} |
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cfg.emit("cert_revoked", domain) |
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@ -657,6 +742,7 @@ func (cfg *Config) RevokeCert(ctx context.Context, domain string, reason int, in |
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if err != nil { |
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return fmt.Errorf("certificate revoked, but unable to delete certificate metadata: %v", err) |
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} |
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} |
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return nil |
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} |
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@ -692,27 +778,50 @@ func (cfg *Config) TLSConfig() *tls.Config { |
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} |
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} |
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// getPrecheckedIssuer returns an Issuer with pre-checks
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// completed, if it is also a PreChecker. It also checks
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// that storage is functioning. If a nil Issuer is returned
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// with a nil error, that means to skip this operation
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// (not an error, just a no-op).
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func (cfg *Config) getPrecheckedIssuer(ctx context.Context, names []string, interactive bool) (Issuer, error) { |
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// ensure storage is writeable and readable
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// TODO: this is not necessary every time; should only
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// perform check once every so often for each storage,
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// which may require some global state...
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err := cfg.checkStorage() |
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if err != nil { |
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return nil, fmt.Errorf("failed storage check: %v - storage is probably misconfigured", err) |
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// getChallengeInfo loads the challenge info from either the internal challenge memory
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// or the external storage (implying distributed solving). The second return value
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// indicates whether challenge info was loaded from external storage. If true, the
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// challenge is being solved in a distributed fashion; if false, from internal memory.
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// If no matching challenge information can be found, an error is returned.
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func (cfg *Config) getChallengeInfo(identifier string) (Challenge, bool, error) { |
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// first, check if our process initiated this challenge; if so, just return it
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chalData, ok := GetACMEChallenge(identifier) |
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if ok { |
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return chalData, false, nil |
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} |
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if prechecker, ok := cfg.Issuer.(PreChecker); ok { |
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err := prechecker.PreCheck(ctx, names, interactive) |
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if err != nil { |
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return nil, err |
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// otherwise, perhaps another instance in the cluster initiated it; check
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// the configured storage to retrieve challenge data
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var chalInfo acme.Challenge |
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var chalInfoBytes []byte |
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var tokenKey string |
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for _, issuer := range cfg.Issuers { |
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ds := distributedSolver{ |
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storage: cfg.Storage, |
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storageKeyIssuerPrefix: storageKeyACMECAPrefix(issuer.IssuerKey()), |
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} |
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tokenKey = ds.challengeTokensKey(identifier) |
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var err error |
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chalInfoBytes, err = cfg.Storage.Load(tokenKey) |
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if err == nil { |
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break |
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} |
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if _, ok := err.(ErrNotExist); ok { |
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continue |
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} |
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return Challenge{}, false, fmt.Errorf("opening distributed challenge token file %s: %v", tokenKey, err) |
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} |
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if len(chalInfoBytes) == 0 { |
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return Challenge{}, false, fmt.Errorf("no information found to solve challenge for identifier: %s", identifier) |
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} |
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err := json.Unmarshal(chalInfoBytes, &chalInfo) |
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if err != nil { |
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return Challenge{}, false, fmt.Errorf("decoding challenge token file %s (corrupted?): %v", tokenKey, err) |
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} |
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return cfg.Issuer, nil |
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return Challenge{Challenge: chalInfo}, true, nil |
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} |
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// checkStorage tests the storage by writing random bytes
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@ -758,8 +867,8 @@ func (cfg *Config) checkStorage() error { |
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// associated with cfg's certificate cache has all the
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// resources related to the certificate for domain: the
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// certificate, the private key, and the metadata.
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func (cfg *Config) storageHasCertResources(domain string) bool { |
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issuerKey := cfg.Issuer.IssuerKey() |
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func (cfg *Config) storageHasCertResources(issuer Issuer, domain string) bool { |
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issuerKey := issuer.IssuerKey() |
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certKey := StorageKeys.SiteCert(issuerKey, domain) |
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keyKey := StorageKeys.SitePrivateKey(issuerKey, domain) |
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metaKey := StorageKeys.SiteMeta(issuerKey, domain) |
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@ -771,18 +880,19 @@ func (cfg *Config) storageHasCertResources(domain string) bool { |
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// lockKey returns a key for a lock that is specific to the operation
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// named op being performed related to domainName and this config's CA.
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func (cfg *Config) lockKey(op, domainName string) string { |
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return fmt.Sprintf("%s_%s_%s", op, domainName, cfg.Issuer.IssuerKey()) |
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return fmt.Sprintf("%s_%s", op, domainName) |
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} |
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// managedCertNeedsRenewal returns true if certRes is
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// expiring soon or already expired, or if the process
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// of checking the expiration returned an error.
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// managedCertNeedsRenewal returns true if certRes is expiring soon or already expired,
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// or if the process of decoding the cert and checking its expiration returned an error.
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func (cfg *Config) managedCertNeedsRenewal(certRes CertificateResource) (time.Duration, bool) { |
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cert, err := makeCertificate(certRes.CertificatePEM, certRes.PrivateKeyPEM) |
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certChain, err := parseCertsFromPEMBundle(certRes.CertificatePEM) |
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if err != nil { |
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return 0, true |
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} |
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return time.Until(cert.Leaf.NotAfter), cert.NeedsRenewal(cfg) |
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remaining := time.Until(certChain[0].NotAfter) |
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needsRenew := currentlyInRenewalWindow(certChain[0].NotBefore, certChain[0].NotAfter, cfg.RenewalWindowRatio) |
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return remaining, needsRenew |
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} |
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func (cfg *Config) emit(eventName string, data interface{}) { |
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@ -792,11 +902,40 @@ func (cfg *Config) emit(eventName string, data interface{}) { |
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cfg.OnEvent(eventName, data) |
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} |
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func loggerNamed(l *zap.Logger, name string) *zap.Logger { |
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if l == nil { |
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return nil |
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} |
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return l.Named(name) |
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} |
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// CertificateSelector is a type which can select a certificate to use given multiple choices.
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type CertificateSelector interface { |
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SelectCertificate(*tls.ClientHelloInfo, []Certificate) (Certificate, error) |
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} |
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// OCSPConfig configures how OCSP is handled.
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type OCSPConfig struct { |
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// Disable automatic OCSP stapling; strongly
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// discouraged unless you have a good reason.
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// Disabling this puts clients at greater risk
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// and reduces their privacy.
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DisableStapling bool |
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// A map of OCSP responder domains to replacement
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// domains for querying OCSP servers. Used for
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// overriding the OCSP responder URL that is
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// embedded in certificates. Mapping to an empty
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// URL will disable OCSP from that responder.
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ResponderOverrides map[string]string |
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} |
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// certIssueLockOp is the name of the operation used
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// when naming a lock to make it mutually exclusive
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|
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// with other certificate issuance operations for a
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// certain name.
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|
|
const certIssueLockOp = "issue_cert" |
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|
// Constants for PKIX MustStaple extension.
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|
var ( |
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|
|
tlsFeatureExtensionOID = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 1, 24} |
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6543
4 years ago
committed by
GitHub