package registry import ( "bytes" "crypto/sha256" // this is required for some certificates _ "crypto/sha512" "encoding/hex" "encoding/json" "fmt" "io" "io/ioutil" "net/http" "net/http/cookiejar" "net/url" "strconv" "strings" "time" log "github.com/Sirupsen/logrus" "github.com/docker/docker/pkg/httputils" "github.com/docker/docker/pkg/tarsum" "github.com/docker/docker/utils" ) type Session struct { authConfig *AuthConfig reqFactory *utils.HTTPRequestFactory indexEndpoint *Endpoint jar *cookiejar.Jar timeout TimeoutType } func NewSession(authConfig *AuthConfig, factory *utils.HTTPRequestFactory, endpoint *Endpoint, timeout bool) (r *Session, err error) { r = &Session{ authConfig: authConfig, indexEndpoint: endpoint, } if timeout { r.timeout = ReceiveTimeout } r.jar, err = cookiejar.New(nil) if err != nil { return nil, err } // If we're working with a standalone private registry over HTTPS, send Basic Auth headers // alongside our requests. if r.indexEndpoint.VersionString(1) != IndexServerAddress() && r.indexEndpoint.URL.Scheme == "https" { info, err := r.indexEndpoint.Ping() if err != nil { return nil, err } if info.Standalone { log.Debugf("Endpoint %s is eligible for private registry registry. Enabling decorator.", r.indexEndpoint.String()) dec := utils.NewHTTPAuthDecorator(authConfig.Username, authConfig.Password) factory.AddDecorator(dec) } } r.reqFactory = factory return r, nil } func (r *Session) doRequest(req *http.Request) (*http.Response, *http.Client, error) { return doRequest(req, r.jar, r.timeout, r.indexEndpoint.secure) } // Retrieve the history of a given image from the Registry. // Return a list of the parent's json (requested image included) func (r *Session) GetRemoteHistory(imgID, registry string, token []string) ([]string, error) { req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/ancestry", nil) if err != nil { return nil, err } setTokenAuth(req, token) res, _, err := r.doRequest(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode != 200 { if res.StatusCode == 401 { return nil, errLoginRequired } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Server error: %d trying to fetch remote history for %s", res.StatusCode, imgID), res) } jsonString, err := ioutil.ReadAll(res.Body) if err != nil { return nil, fmt.Errorf("Error while reading the http response: %s", err) } log.Debugf("Ancestry: %s", jsonString) history := new([]string) if err := json.Unmarshal(jsonString, history); err != nil { return nil, err } return *history, nil } // Check if an image exists in the Registry // TODO: This method should return the errors instead of masking them and returning false func (r *Session) LookupRemoteImage(imgID, registry string, token []string) bool { req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil) if err != nil { log.Errorf("Error in LookupRemoteImage %s", err) return false } setTokenAuth(req, token) res, _, err := r.doRequest(req) if err != nil { log.Errorf("Error in LookupRemoteImage %s", err) return false } res.Body.Close() return res.StatusCode == 200 } // Retrieve an image from the Registry. func (r *Session) GetRemoteImageJSON(imgID, registry string, token []string) ([]byte, int, error) { // Get the JSON req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil) if err != nil { return nil, -1, fmt.Errorf("Failed to download json: %s", err) } setTokenAuth(req, token) res, _, err := r.doRequest(req) if err != nil { return nil, -1, fmt.Errorf("Failed to download json: %s", err) } defer res.Body.Close() if res.StatusCode != 200 { return nil, -1, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res) } // if the size header is not present, then set it to '-1' imageSize := -1 if hdr := res.Header.Get("X-Docker-Size"); hdr != "" { imageSize, err = strconv.Atoi(hdr) if err != nil { return nil, -1, err } } jsonString, err := ioutil.ReadAll(res.Body) if err != nil { return nil, -1, fmt.Errorf("Failed to parse downloaded json: %s (%s)", err, jsonString) } return jsonString, imageSize, nil } func (r *Session) GetRemoteImageLayer(imgID, registry string, token []string, imgSize int64) (io.ReadCloser, error) { var ( retries = 5 statusCode = 0 client *http.Client res *http.Response imageURL = fmt.Sprintf("%simages/%s/layer", registry, imgID) ) req, err := r.reqFactory.NewRequest("GET", imageURL, nil) if err != nil { return nil, fmt.Errorf("Error while getting from the server: %s\n", err) } setTokenAuth(req, token) for i := 1; i <= retries; i++ { statusCode = 0 res, client, err = r.doRequest(req) if err != nil { log.Debugf("Error contacting registry: %s", err) if res != nil { if res.Body != nil { res.Body.Close() } statusCode = res.StatusCode } if i == retries { return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)", statusCode, imgID) } time.Sleep(time.Duration(i) * 5 * time.Second) continue } break } if res.StatusCode != 200 { res.Body.Close() return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)", res.StatusCode, imgID) } if res.Header.Get("Accept-Ranges") == "bytes" && imgSize > 0 { log.Debugf("server supports resume") return httputils.ResumableRequestReaderWithInitialResponse(client, req, 5, imgSize, res), nil } log.Debugf("server doesn't support resume") return res.Body, nil } func (r *Session) GetRemoteTags(registries []string, repository string, token []string) (map[string]string, error) { if strings.Count(repository, "/") == 0 { // This will be removed once the Registry supports auto-resolution on // the "library" namespace repository = "library/" + repository } for _, host := range registries { endpoint := fmt.Sprintf("%srepositories/%s/tags", host, repository) req, err := r.reqFactory.NewRequest("GET", endpoint, nil) if err != nil { return nil, err } setTokenAuth(req, token) res, _, err := r.doRequest(req) if err != nil { return nil, err } log.Debugf("Got status code %d from %s", res.StatusCode, endpoint) defer res.Body.Close() if res.StatusCode != 200 && res.StatusCode != 404 { continue } else if res.StatusCode == 404 { return nil, fmt.Errorf("Repository not found") } result := make(map[string]string) if err := json.NewDecoder(res.Body).Decode(&result); err != nil { return nil, err } return result, nil } return nil, fmt.Errorf("Could not reach any registry endpoint") } func buildEndpointsList(headers []string, indexEp string) ([]string, error) { var endpoints []string parsedURL, err := url.Parse(indexEp) if err != nil { return nil, err } var urlScheme = parsedURL.Scheme // The Registry's URL scheme has to match the Index' for _, ep := range headers { epList := strings.Split(ep, ",") for _, epListElement := range epList { endpoints = append( endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, strings.TrimSpace(epListElement))) } } return endpoints, nil } func (r *Session) GetRepositoryData(remote string) (*RepositoryData, error) { repositoryTarget := fmt.Sprintf("%srepositories/%s/images", r.indexEndpoint.VersionString(1), remote) log.Debugf("[registry] Calling GET %s", repositoryTarget) req, err := r.reqFactory.NewRequest("GET", repositoryTarget, nil) if err != nil { return nil, err } if r.authConfig != nil && len(r.authConfig.Username) > 0 { req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) } req.Header.Set("X-Docker-Token", "true") res, _, err := r.doRequest(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode == 401 { return nil, errLoginRequired } // TODO: Right now we're ignoring checksums in the response body. // In the future, we need to use them to check image validity. if res.StatusCode != 200 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code: %d", res.StatusCode), res) } var tokens []string if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] } var endpoints []string if res.Header.Get("X-Docker-Endpoints") != "" { endpoints, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], r.indexEndpoint.VersionString(1)) if err != nil { return nil, err } } else { // Assume the endpoint is on the same host endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", r.indexEndpoint.URL.Scheme, req.URL.Host)) } remoteChecksums := []*ImgData{} if err := json.NewDecoder(res.Body).Decode(&remoteChecksums); err != nil { return nil, err } // Forge a better object from the retrieved data imgsData := make(map[string]*ImgData) for _, elem := range remoteChecksums { imgsData[elem.ID] = elem } return &RepositoryData{ ImgList: imgsData, Endpoints: endpoints, Tokens: tokens, }, nil } func (r *Session) PushImageChecksumRegistry(imgData *ImgData, registry string, token []string) error { log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/checksum") req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/checksum", nil) if err != nil { return err } setTokenAuth(req, token) req.Header.Set("X-Docker-Checksum", imgData.Checksum) req.Header.Set("X-Docker-Checksum-Payload", imgData.ChecksumPayload) res, _, err := r.doRequest(req) if err != nil { return fmt.Errorf("Failed to upload metadata: %s", err) } defer res.Body.Close() if len(res.Cookies()) > 0 { r.jar.SetCookies(req.URL, res.Cookies()) } if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return fmt.Errorf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err) } var jsonBody map[string]string if err := json.Unmarshal(errBody, &jsonBody); err != nil { errBody = []byte(err.Error()) } else if jsonBody["error"] == "Image already exists" { return ErrAlreadyExists } return fmt.Errorf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody) } return nil } // Push a local image to the registry func (r *Session) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error { log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/json") req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/json", bytes.NewReader(jsonRaw)) if err != nil { return err } req.Header.Add("Content-type", "application/json") setTokenAuth(req, token) res, _, err := r.doRequest(req) if err != nil { return fmt.Errorf("Failed to upload metadata: %s", err) } defer res.Body.Close() if res.StatusCode == 401 && strings.HasPrefix(registry, "http://") { return utils.NewHTTPRequestError("HTTP code 401, Docker will not send auth headers over HTTP.", res) } if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res) } var jsonBody map[string]string if err := json.Unmarshal(errBody, &jsonBody); err != nil { errBody = []byte(err.Error()) } else if jsonBody["error"] == "Image already exists" { return ErrAlreadyExists } return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody), res) } return nil } func (r *Session) PushImageLayerRegistry(imgID string, layer io.Reader, registry string, token []string, jsonRaw []byte) (checksum string, checksumPayload string, err error) { log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgID+"/layer") tarsumLayer, err := tarsum.NewTarSum(layer, false, tarsum.Version0) if err != nil { return "", "", err } h := sha256.New() h.Write(jsonRaw) h.Write([]byte{'\n'}) checksumLayer := io.TeeReader(tarsumLayer, h) req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgID+"/layer", checksumLayer) if err != nil { return "", "", err } req.Header.Add("Content-Type", "application/octet-stream") req.ContentLength = -1 req.TransferEncoding = []string{"chunked"} setTokenAuth(req, token) res, _, err := r.doRequest(req) if err != nil { return "", "", fmt.Errorf("Failed to upload layer: %s", err) } if rc, ok := layer.(io.Closer); ok { if err := rc.Close(); err != nil { return "", "", err } } defer res.Body.Close() if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return "", "", utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res) } return "", "", utils.NewHTTPRequestError(fmt.Sprintf("Received HTTP code %d while uploading layer: %s", res.StatusCode, errBody), res) } checksumPayload = "sha256:" + hex.EncodeToString(h.Sum(nil)) return tarsumLayer.Sum(jsonRaw), checksumPayload, nil } // push a tag on the registry. // Remote has the format '/ func (r *Session) PushRegistryTag(remote, revision, tag, registry string, token []string) error { // "jsonify" the string revision = "\"" + revision + "\"" path := fmt.Sprintf("repositories/%s/tags/%s", remote, tag) req, err := r.reqFactory.NewRequest("PUT", registry+path, strings.NewReader(revision)) if err != nil { return err } req.Header.Add("Content-type", "application/json") setTokenAuth(req, token) req.ContentLength = int64(len(revision)) res, _, err := r.doRequest(req) if err != nil { return err } res.Body.Close() if res.StatusCode != 200 && res.StatusCode != 201 { return utils.NewHTTPRequestError(fmt.Sprintf("Internal server error: %d trying to push tag %s on %s", res.StatusCode, tag, remote), res) } return nil } func (r *Session) PushImageJSONIndex(remote string, imgList []*ImgData, validate bool, regs []string) (*RepositoryData, error) { cleanImgList := []*ImgData{} if validate { for _, elem := range imgList { if elem.Checksum != "" { cleanImgList = append(cleanImgList, elem) } } } else { cleanImgList = imgList } imgListJSON, err := json.Marshal(cleanImgList) if err != nil { return nil, err } var suffix string if validate { suffix = "images" } u := fmt.Sprintf("%srepositories/%s/%s", r.indexEndpoint.VersionString(1), remote, suffix) log.Debugf("[registry] PUT %s", u) log.Debugf("Image list pushed to index:\n%s", imgListJSON) headers := map[string][]string{ "Content-type": {"application/json"}, "X-Docker-Token": {"true"}, } if validate { headers["X-Docker-Endpoints"] = regs } // Redirect if necessary var res *http.Response for { if res, err = r.putImageRequest(u, headers, imgListJSON); err != nil { return nil, err } if !shouldRedirect(res) { break } res.Body.Close() u = res.Header.Get("Location") log.Debugf("Redirected to %s", u) } defer res.Body.Close() var tokens, endpoints []string if !validate { if res.StatusCode != 200 && res.StatusCode != 201 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push repository %s: %s", res.StatusCode, remote, errBody), res) } if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] log.Debugf("Auth token: %v", tokens) } else { return nil, fmt.Errorf("Index response didn't contain an access token") } if res.Header.Get("X-Docker-Endpoints") != "" { endpoints, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], r.indexEndpoint.VersionString(1)) if err != nil { return nil, err } } else { return nil, fmt.Errorf("Index response didn't contain any endpoints") } } if validate { if res.StatusCode != 204 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push checksums %s: %s", res.StatusCode, remote, errBody), res) } } return &RepositoryData{ Tokens: tokens, Endpoints: endpoints, }, nil } func (r *Session) putImageRequest(u string, headers map[string][]string, body []byte) (*http.Response, error) { req, err := r.reqFactory.NewRequest("PUT", u, bytes.NewReader(body)) if err != nil { return nil, err } req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) req.ContentLength = int64(len(body)) for k, v := range headers { req.Header[k] = v } response, _, err := r.doRequest(req) if err != nil { return nil, err } return response, nil } func shouldRedirect(response *http.Response) bool { return response.StatusCode >= 300 && response.StatusCode < 400 } func (r *Session) SearchRepositories(term string) (*SearchResults, error) { log.Debugf("Index server: %s", r.indexEndpoint) u := r.indexEndpoint.VersionString(1) + "search?q=" + url.QueryEscape(term) req, err := r.reqFactory.NewRequest("GET", u, nil) if err != nil { return nil, err } if r.authConfig != nil && len(r.authConfig.Username) > 0 { req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) } req.Header.Set("X-Docker-Token", "true") res, _, err := r.doRequest(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode != 200 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("Unexepected status code %d", res.StatusCode), res) } result := new(SearchResults) err = json.NewDecoder(res.Body).Decode(result) return result, err } func (r *Session) GetAuthConfig(withPasswd bool) *AuthConfig { password := "" if withPasswd { password = r.authConfig.Password } return &AuthConfig{ Username: r.authConfig.Username, Password: password, Email: r.authConfig.Email, } } func setTokenAuth(req *http.Request, token []string) { if req.Header.Get("Authorization") == "" { // Don't override req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) } }