package registry import ( "crypto/tls" "crypto/x509" "encoding/json" "errors" "fmt" "io/ioutil" "net" "net/http" "os" "path" "regexp" "strings" "time" "github.com/docker/docker/pkg/log" "github.com/docker/docker/utils" ) var ( ErrAlreadyExists = errors.New("Image already exists") ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")") errLoginRequired = errors.New("Authentication is required.") ) type TimeoutType uint32 const ( NoTimeout TimeoutType = iota ReceiveTimeout ConnectTimeout ) func newClient(jar http.CookieJar, roots *x509.CertPool, cert *tls.Certificate, timeout TimeoutType) *http.Client { tlsConfig := tls.Config{RootCAs: roots} if cert != nil { tlsConfig.Certificates = append(tlsConfig.Certificates, *cert) } httpTransport := &http.Transport{ DisableKeepAlives: true, Proxy: http.ProxyFromEnvironment, TLSClientConfig: &tlsConfig, } switch timeout { case ConnectTimeout: httpTransport.Dial = func(proto string, addr string) (net.Conn, error) { // Set the connect timeout to 5 seconds conn, err := net.DialTimeout(proto, addr, 5*time.Second) if err != nil { return nil, err } // Set the recv timeout to 10 seconds conn.SetDeadline(time.Now().Add(10 * time.Second)) return conn, nil } case ReceiveTimeout: httpTransport.Dial = func(proto string, addr string) (net.Conn, error) { conn, err := net.Dial(proto, addr) if err != nil { return nil, err } conn = utils.NewTimeoutConn(conn, 1*time.Minute) return conn, nil } } return &http.Client{ Transport: httpTransport, CheckRedirect: AddRequiredHeadersToRedirectedRequests, Jar: jar, } } func doRequest(req *http.Request, jar http.CookieJar, timeout TimeoutType) (*http.Response, *http.Client, error) { hasFile := func(files []os.FileInfo, name string) bool { for _, f := range files { if f.Name() == name { return true } } return false } hostDir := path.Join("/etc/docker/certs.d", req.URL.Host) fs, err := ioutil.ReadDir(hostDir) if err != nil && !os.IsNotExist(err) { return nil, nil, err } var ( pool *x509.CertPool certs []*tls.Certificate ) for _, f := range fs { if strings.HasSuffix(f.Name(), ".crt") { if pool == nil { pool = x509.NewCertPool() } data, err := ioutil.ReadFile(path.Join(hostDir, f.Name())) if err != nil { return nil, nil, err } pool.AppendCertsFromPEM(data) } if strings.HasSuffix(f.Name(), ".cert") { certName := f.Name() keyName := certName[:len(certName)-5] + ".key" if !hasFile(fs, keyName) { return nil, nil, fmt.Errorf("Missing key %s for certificate %s", keyName, certName) } cert, err := tls.LoadX509KeyPair(path.Join(hostDir, certName), path.Join(hostDir, keyName)) if err != nil { return nil, nil, err } certs = append(certs, &cert) } if strings.HasSuffix(f.Name(), ".key") { keyName := f.Name() certName := keyName[:len(keyName)-4] + ".cert" if !hasFile(fs, certName) { return nil, nil, fmt.Errorf("Missing certificate %s for key %s", certName, keyName) } } } if len(certs) == 0 { client := newClient(jar, pool, nil, timeout) res, err := client.Do(req) if err != nil { return nil, nil, err } return res, client, nil } for i, cert := range certs { client := newClient(jar, pool, cert, timeout) res, err := client.Do(req) // If this is the last cert, otherwise, continue to next cert if 403 or 5xx if i == len(certs)-1 || err == nil && res.StatusCode != 403 && res.StatusCode < 500 { return res, client, err } } return nil, nil, nil } func pingRegistryEndpoint(endpoint string) (RegistryInfo, error) { if endpoint == IndexServerAddress() { // Skip the check, we now this one is valid // (and we never want to fallback to http in case of error) return RegistryInfo{Standalone: false}, nil } req, err := http.NewRequest("GET", endpoint+"_ping", nil) if err != nil { return RegistryInfo{Standalone: false}, err } resp, _, err := doRequest(req, nil, ConnectTimeout) if err != nil { return RegistryInfo{Standalone: false}, err } defer resp.Body.Close() jsonString, err := ioutil.ReadAll(resp.Body) if err != nil { return RegistryInfo{Standalone: false}, fmt.Errorf("Error while reading the http response: %s", err) } // If the header is absent, we assume true for compatibility with earlier // versions of the registry. default to true info := RegistryInfo{ Standalone: true, } if err := json.Unmarshal(jsonString, &info); err != nil { log.Debugf("Error unmarshalling the _ping RegistryInfo: %s", err) // don't stop here. Just assume sane defaults } if hdr := resp.Header.Get("X-Docker-Registry-Version"); hdr != "" { log.Debugf("Registry version header: '%s'", hdr) info.Version = hdr } log.Debugf("RegistryInfo.Version: %q", info.Version) standalone := resp.Header.Get("X-Docker-Registry-Standalone") log.Debugf("Registry standalone header: '%s'", standalone) if !strings.EqualFold(standalone, "true") && standalone != "1" && len(standalone) > 0 { // there is a header set, and it is not "true" or "1", so assume fails info.Standalone = false } log.Debugf("RegistryInfo.Standalone: %q", info.Standalone) return info, nil } func validateRepositoryName(repositoryName string) error { var ( namespace string name string ) nameParts := strings.SplitN(repositoryName, "/", 2) if len(nameParts) < 2 { namespace = "library" name = nameParts[0] } else { namespace = nameParts[0] name = nameParts[1] } validNamespace := regexp.MustCompile(`^([a-z0-9_]{4,30})$`) if !validNamespace.MatchString(namespace) { return fmt.Errorf("Invalid namespace name (%s), only [a-z0-9_] are allowed, size between 4 and 30", namespace) } validRepo := regexp.MustCompile(`^([a-z0-9-_.]+)$`) if !validRepo.MatchString(name) { return fmt.Errorf("Invalid repository name (%s), only [a-z0-9-_.] are allowed", name) } return nil } // Resolves a repository name to a hostname + name func ResolveRepositoryName(reposName string) (string, string, error) { if strings.Contains(reposName, "://") { // It cannot contain a scheme! return "", "", ErrInvalidRepositoryName } nameParts := strings.SplitN(reposName, "/", 2) if len(nameParts) == 1 || (!strings.Contains(nameParts[0], ".") && !strings.Contains(nameParts[0], ":") && nameParts[0] != "localhost") { // This is a Docker Index repos (ex: samalba/hipache or ubuntu) err := validateRepositoryName(reposName) return IndexServerAddress(), reposName, err } hostname := nameParts[0] reposName = nameParts[1] if strings.Contains(hostname, "index.docker.io") { return "", "", fmt.Errorf("Invalid repository name, try \"%s\" instead", reposName) } if err := validateRepositoryName(reposName); err != nil { return "", "", err } return hostname, reposName, nil } // this method expands the registry name as used in the prefix of a repo // to a full url. if it already is a url, there will be no change. // The registry is pinged to test if it http or https func ExpandAndVerifyRegistryUrl(hostname string) (string, error) { if strings.HasPrefix(hostname, "http:") || strings.HasPrefix(hostname, "https:") { // if there is no slash after https:// (8 characters) then we have no path in the url if strings.LastIndex(hostname, "/") < 9 { // there is no path given. Expand with default path hostname = hostname + "/v1/" } if _, err := pingRegistryEndpoint(hostname); err != nil { return "", errors.New("Invalid Registry endpoint: " + err.Error()) } return hostname, nil } endpoint := fmt.Sprintf("https://%s/v1/", hostname) if _, err := pingRegistryEndpoint(endpoint); err != nil { log.Debugf("Registry %s does not work (%s), falling back to http", endpoint, err) endpoint = fmt.Sprintf("http://%s/v1/", hostname) if _, err = pingRegistryEndpoint(endpoint); err != nil { //TODO: triggering highland build can be done there without "failing" return "", errors.New("Invalid Registry endpoint: " + err.Error()) } } return endpoint, nil } func trustedLocation(req *http.Request) bool { var ( trusteds = []string{"docker.com", "docker.io"} hostname = strings.SplitN(req.Host, ":", 2)[0] ) if req.URL.Scheme != "https" { return false } for _, trusted := range trusteds { if hostname == trusted || strings.HasSuffix(hostname, "."+trusted) { return true } } return false } func AddRequiredHeadersToRedirectedRequests(req *http.Request, via []*http.Request) error { if via != nil && via[0] != nil { if trustedLocation(req) && trustedLocation(via[0]) { req.Header = via[0].Header return nil } for k, v := range via[0].Header { if k != "Authorization" { for _, vv := range v { req.Header.Add(k, vv) } } } } return nil }