package registry import ( "context" "crypto/tls" "crypto/x509" "fmt" "net/http" "os" "os/signal" "strings" "syscall" "time" logstash "github.com/bshuster-repo/logrus-logstash-hook" "github.com/docker/go-metrics" gorhandlers "github.com/gorilla/handlers" "github.com/sirupsen/logrus" "github.com/spf13/cobra" "golang.org/x/crypto/acme" "golang.org/x/crypto/acme/autocert" "github.com/distribution/distribution/v3/configuration" dcontext "github.com/distribution/distribution/v3/context" "github.com/distribution/distribution/v3/health" "github.com/distribution/distribution/v3/registry/handlers" "github.com/distribution/distribution/v3/registry/listener" "github.com/distribution/distribution/v3/uuid" "github.com/distribution/distribution/v3/version" ) // a map of TLS cipher suite names to constants in https://golang.org/pkg/crypto/tls/#pkg-constants var cipherSuites = map[string]uint16{ // TLS 1.0 - 1.2 cipher suites "TLS_RSA_WITH_3DES_EDE_CBC_SHA": tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_RSA_WITH_AES_128_CBC_SHA": tls.TLS_RSA_WITH_AES_128_CBC_SHA, "TLS_RSA_WITH_AES_256_CBC_SHA": tls.TLS_RSA_WITH_AES_256_CBC_SHA, "TLS_RSA_WITH_AES_128_GCM_SHA256": tls.TLS_RSA_WITH_AES_128_GCM_SHA256, "TLS_RSA_WITH_AES_256_GCM_SHA384": tls.TLS_RSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256": tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256": tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384": tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384": tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256": tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256": tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, // TLS 1.3 cipher suites "TLS_AES_128_GCM_SHA256": tls.TLS_AES_128_GCM_SHA256, "TLS_AES_256_GCM_SHA384": tls.TLS_AES_256_GCM_SHA384, "TLS_CHACHA20_POLY1305_SHA256": tls.TLS_CHACHA20_POLY1305_SHA256, } // a list of default ciphersuites to utilize var defaultCipherSuites = []uint16{ tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, tls.TLS_AES_128_GCM_SHA256, tls.TLS_CHACHA20_POLY1305_SHA256, tls.TLS_AES_256_GCM_SHA384, } const defaultTLSVersionStr = "tls1.2" // tlsVersions maps user-specified values to tls version constants. var tlsVersions = map[string]uint16{ "tls1.2": tls.VersionTLS12, "tls1.3": tls.VersionTLS13, } // defaultLogFormatter is the default formatter to use for logs. const defaultLogFormatter = "text" // this channel gets notified when process receives signal. It is global to ease unit testing var quit = make(chan os.Signal, 1) // HandlerFunc defines an http middleware type HandlerFunc func(config *configuration.Configuration, handler http.Handler) http.Handler var handlerMiddlewares []HandlerFunc // RegisterHandler is used to register http middlewares to the registry service func RegisterHandler(handlerFunc HandlerFunc) { handlerMiddlewares = append(handlerMiddlewares, handlerFunc) } // ServeCmd is a cobra command for running the registry. var ServeCmd = &cobra.Command{ Use: "serve ", Short: "`serve` stores and distributes Docker images", Long: "`serve` stores and distributes Docker images.", Run: func(cmd *cobra.Command, args []string) { // setup context ctx := dcontext.WithVersion(dcontext.Background(), version.Version) config, err := resolveConfiguration(args) if err != nil { fmt.Fprintf(os.Stderr, "configuration error: %v\n", err) cmd.Usage() os.Exit(1) } registry, err := NewRegistry(ctx, config) if err != nil { logrus.Fatalln(err) } configureDebugServer(config) if err = registry.ListenAndServe(); err != nil { logrus.Fatalln(err) } }, } // A Registry represents a complete instance of the registry. // // TODO(aaronl): It might make sense for Registry to become an interface. type Registry struct { config *configuration.Configuration app *handlers.App server *http.Server } // NewRegistry creates a new registry from a context and configuration struct. func NewRegistry(ctx context.Context, config *configuration.Configuration) (*Registry, error) { var err error ctx, err = configureLogging(ctx, config) if err != nil { return nil, fmt.Errorf("error configuring logger: %v", err) } // inject a logger into the uuid library. warns us if there is a problem // with uuid generation under low entropy. uuid.Loggerf = dcontext.GetLogger(ctx).Warnf app := handlers.NewApp(ctx, config) // TODO(aaronl): The global scope of the health checks means NewRegistry // can only be called once per process. app.RegisterHealthChecks() var handler http.Handler = app handler = alive("/", handler) handler = health.Handler(handler) handler = panicHandler(handler) if !config.Log.AccessLog.Disabled { handler = gorhandlers.CombinedLoggingHandler(os.Stdout, handler) } for _, applyHandlerMiddleware := range handlerMiddlewares { handler = applyHandlerMiddleware(config, handler) } server := &http.Server{ Handler: handler, } return &Registry{ app: app, config: config, server: server, }, nil } // takes a list of cipher suites and converts it to a list of respective tls constants // if an empty list is provided, then the defaults will be used func getCipherSuites(names []string) ([]uint16, error) { if len(names) == 0 { return defaultCipherSuites, nil } cipherSuiteConsts := make([]uint16, len(names)) for i, name := range names { cipherSuiteConst, ok := cipherSuites[name] if !ok { return nil, fmt.Errorf("unknown TLS cipher suite '%s' specified for http.tls.cipherSuites", name) } cipherSuiteConsts[i] = cipherSuiteConst } return cipherSuiteConsts, nil } // takes a list of cipher suite ids and converts it to a list of respective names func getCipherSuiteNames(ids []uint16) []string { if len(ids) == 0 { return nil } names := make([]string, len(ids)) for i, id := range ids { names[i] = tls.CipherSuiteName(id) } return names } // set ACME-server/DirectoryURL, if provided func setDirectoryURL(directoryurl string) *acme.Client { if len(directoryurl) > 0 { return &acme.Client{DirectoryURL: directoryurl} } return nil } // ListenAndServe runs the registry's HTTP server. func (registry *Registry) ListenAndServe() error { config := registry.config ln, err := listener.NewListener(config.HTTP.Net, config.HTTP.Addr) if err != nil { return err } if config.HTTP.TLS.Certificate != "" || config.HTTP.TLS.LetsEncrypt.CacheFile != "" { if config.HTTP.TLS.MinimumTLS == "" { config.HTTP.TLS.MinimumTLS = defaultTLSVersionStr } tlsMinVersion, ok := tlsVersions[config.HTTP.TLS.MinimumTLS] if !ok { return fmt.Errorf("unknown minimum TLS level '%s' specified for http.tls.minimumtls", config.HTTP.TLS.MinimumTLS) } dcontext.GetLogger(registry.app).Infof("restricting TLS version to %s or higher", config.HTTP.TLS.MinimumTLS) var tlsCipherSuites []uint16 // configuring cipher suites are no longer supported after the tls1.3. // (https://go.dev/blog/tls-cipher-suites) if tlsMinVersion > tls.VersionTLS12 { dcontext.GetLogger(registry.app).Warnf("restricting TLS cipher suites to empty. Because configuring cipher suites is no longer supported in %s", config.HTTP.TLS.MinimumTLS) } else { tlsCipherSuites, err = getCipherSuites(config.HTTP.TLS.CipherSuites) if err != nil { return err } dcontext.GetLogger(registry.app).Infof("restricting TLS cipher suites to: %s", strings.Join(getCipherSuiteNames(tlsCipherSuites), ",")) } tlsConf := &tls.Config{ ClientAuth: tls.NoClientCert, NextProtos: nextProtos(config), MinVersion: tlsMinVersion, CipherSuites: tlsCipherSuites, } if config.HTTP.TLS.LetsEncrypt.CacheFile != "" { if config.HTTP.TLS.Certificate != "" { return fmt.Errorf("cannot specify both certificate and Let's Encrypt") } m := &autocert.Manager{ HostPolicy: autocert.HostWhitelist(config.HTTP.TLS.LetsEncrypt.Hosts...), Cache: autocert.DirCache(config.HTTP.TLS.LetsEncrypt.CacheFile), Email: config.HTTP.TLS.LetsEncrypt.Email, Prompt: autocert.AcceptTOS, Client: setDirectoryURL(config.HTTP.TLS.LetsEncrypt.DirectoryURL), } tlsConf.GetCertificate = m.GetCertificate tlsConf.NextProtos = append(tlsConf.NextProtos, acme.ALPNProto) } else { tlsConf.Certificates = make([]tls.Certificate, 1) tlsConf.Certificates[0], err = tls.LoadX509KeyPair(config.HTTP.TLS.Certificate, config.HTTP.TLS.Key) if err != nil { return err } } if len(config.HTTP.TLS.ClientCAs) != 0 { pool := x509.NewCertPool() for _, ca := range config.HTTP.TLS.ClientCAs { caPem, err := os.ReadFile(ca) if err != nil { return err } if ok := pool.AppendCertsFromPEM(caPem); !ok { return fmt.Errorf("could not add CA to pool") } } for _, subj := range pool.Subjects() { //nolint:staticcheck // FIXME(thaJeztah): ignore SA1019: ac.(*accessController).rootCerts.Subjects has been deprecated since Go 1.18: if s was returned by SystemCertPool, Subjects will not include the system roots. (staticcheck) dcontext.GetLogger(registry.app).Debugf("CA Subject: %s", string(subj)) } tlsConf.ClientAuth = tls.RequireAndVerifyClientCert tlsConf.ClientCAs = pool } ln = tls.NewListener(ln, tlsConf) dcontext.GetLogger(registry.app).Infof("listening on %v, tls", ln.Addr()) } else { dcontext.GetLogger(registry.app).Infof("listening on %v", ln.Addr()) } if config.HTTP.DrainTimeout == 0 { return registry.server.Serve(ln) } // setup channel to get notified on SIGTERM signal signal.Notify(quit, syscall.SIGTERM) serveErr := make(chan error) // Start serving in goroutine and listen for stop signal in main thread go func() { serveErr <- registry.server.Serve(ln) }() select { case err := <-serveErr: return err case <-quit: dcontext.GetLogger(registry.app).Info("stopping server gracefully. Draining connections for ", config.HTTP.DrainTimeout) // shutdown the server with a grace period of configured timeout c, cancel := context.WithTimeout(context.Background(), config.HTTP.DrainTimeout) defer cancel() return registry.server.Shutdown(c) } } func configureDebugServer(config *configuration.Configuration) { if config.HTTP.Debug.Addr != "" { go func(addr string) { logrus.Infof("debug server listening %v", addr) if err := http.ListenAndServe(addr, nil); err != nil { logrus.Fatalf("error listening on debug interface: %v", err) } }(config.HTTP.Debug.Addr) configurePrometheus(config) } } func configurePrometheus(config *configuration.Configuration) { if config.HTTP.Debug.Prometheus.Enabled { path := config.HTTP.Debug.Prometheus.Path if path == "" { path = "/metrics" } logrus.Info("providing prometheus metrics on ", path) http.Handle(path, metrics.Handler()) } } // configureLogging prepares the context with a logger using the // configuration. func configureLogging(ctx context.Context, config *configuration.Configuration) (context.Context, error) { logrus.SetLevel(logLevel(config.Log.Level)) logrus.SetReportCaller(config.Log.ReportCaller) formatter := config.Log.Formatter if formatter == "" { formatter = defaultLogFormatter } switch formatter { case "json": logrus.SetFormatter(&logrus.JSONFormatter{ TimestampFormat: time.RFC3339Nano, DisableHTMLEscape: true, }) case "text": logrus.SetFormatter(&logrus.TextFormatter{ TimestampFormat: time.RFC3339Nano, }) case "logstash": logrus.SetFormatter(&logstash.LogstashFormatter{ Formatter: &logrus.JSONFormatter{TimestampFormat: time.RFC3339Nano}, }) default: return ctx, fmt.Errorf("unsupported logging formatter: %q", formatter) } logrus.Debugf("using %q logging formatter", formatter) if len(config.Log.Fields) > 0 { // build up the static fields, if present. var fields []interface{} for k := range config.Log.Fields { fields = append(fields, k) } ctx = dcontext.WithValues(ctx, config.Log.Fields) ctx = dcontext.WithLogger(ctx, dcontext.GetLogger(ctx, fields...)) } dcontext.SetDefaultLogger(dcontext.GetLogger(ctx)) return ctx, nil } func logLevel(level configuration.Loglevel) logrus.Level { l, err := logrus.ParseLevel(string(level)) if err != nil { l = logrus.InfoLevel logrus.Warnf("error parsing level %q: %v, using %q ", level, err, l) } return l } // panicHandler add an HTTP handler to web app. The handler recover the happening // panic. logrus.Panic transmits panic message to pre-config log hooks, which is // defined in config.yml. func panicHandler(handler http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { defer func() { if err := recover(); err != nil { logrus.Panic(fmt.Sprintf("%v", err)) } }() handler.ServeHTTP(w, r) }) } // alive simply wraps the handler with a route that always returns an http 200 // response when the path is matched. If the path is not matched, the request // is passed to the provided handler. There is no guarantee of anything but // that the server is up. Wrap with other handlers (such as health.Handler) // for greater affect. func alive(path string, handler http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if r.URL.Path == path { w.Header().Set("Cache-Control", "no-cache") w.WriteHeader(http.StatusOK) return } handler.ServeHTTP(w, r) }) } func resolveConfiguration(args []string) (*configuration.Configuration, error) { var configurationPath string if len(args) > 0 { configurationPath = args[0] } else if os.Getenv("REGISTRY_CONFIGURATION_PATH") != "" { configurationPath = os.Getenv("REGISTRY_CONFIGURATION_PATH") } if configurationPath == "" { return nil, fmt.Errorf("configuration path unspecified") } fp, err := os.Open(configurationPath) if err != nil { return nil, err } defer fp.Close() config, err := configuration.Parse(fp) if err != nil { return nil, fmt.Errorf("error parsing %s: %v", configurationPath, err) } return config, nil } func nextProtos(config *configuration.Configuration) []string { switch config.HTTP.HTTP2.Disabled { case true: return []string{"http/1.1"} default: return []string{"h2", "http/1.1"} } }