/* * Minio Cloud Storage, (C) 2015, 2016, 2017 Minio, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package cmd import ( "encoding/base64" "encoding/xml" "io" "net" "net/http" "net/url" "path" "path/filepath" "reflect" "strings" "sync" mux "github.com/gorilla/mux" "github.com/minio/minio-go/pkg/policy" "github.com/minio/minio-go/pkg/set" "github.com/minio/minio/pkg/errors" "github.com/minio/minio/pkg/hash" ) // http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html // Enforces bucket policies for a bucket for a given tatusaction. func enforceBucketPolicy(bucket, action, resource, referer, sourceIP string, queryParams url.Values) (s3Error APIErrorCode) { // Verify if bucket actually exists objAPI := newObjectLayerFn() if err := checkBucketExist(bucket, objAPI); err != nil { err = errors.Cause(err) switch err.(type) { case BucketNameInvalid: // Return error for invalid bucket name. return ErrInvalidBucketName case BucketNotFound: // For no bucket found we return NoSuchBucket instead. return ErrNoSuchBucket } errorIf(err, "Unable to read bucket policy.") // Return internal error for any other errors so that we can investigate. return ErrInternalError } // Fetch bucket policy, if policy is not set return access denied. p, err := objAPI.GetBucketPolicy(bucket) if err != nil { return ErrAccessDenied } if reflect.DeepEqual(p, emptyBucketPolicy) { return ErrAccessDenied } // Construct resource in 'arn:aws:s3:::examplebucket/object' format. arn := bucketARNPrefix + strings.TrimSuffix(strings.TrimPrefix(resource, "/"), "/") // Get conditions for policy verification. conditionKeyMap := make(policy.ConditionKeyMap) for queryParam := range queryParams { conditionKeyMap[queryParam] = set.CreateStringSet(queryParams.Get(queryParam)) } // Add request referer to conditionKeyMap if present. if referer != "" { conditionKeyMap["referer"] = set.CreateStringSet(referer) } // Add request source Ip to conditionKeyMap. conditionKeyMap["ip"] = set.CreateStringSet(sourceIP) // Validate action, resource and conditions with current policy statements. if !bucketPolicyEvalStatements(action, arn, conditionKeyMap, p.Statements) { return ErrAccessDenied } return ErrNone } // Check if the action is allowed on the bucket/prefix. func isBucketActionAllowed(action, bucket, prefix string, objectAPI ObjectLayer) bool { bp, err := objectAPI.GetBucketPolicy(bucket) if err != nil { return false } if reflect.DeepEqual(bp, emptyBucketPolicy) { return false } resource := bucketARNPrefix + path.Join(bucket, prefix) var conditionKeyMap map[string]set.StringSet // Validate action, resource and conditions with current policy statements. return bucketPolicyEvalStatements(action, resource, conditionKeyMap, bp.Statements) } // GetBucketLocationHandler - GET Bucket location. // ------------------------- // This operation returns bucket location. func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) bucket := vars["bucket"] objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } s3Error := checkRequestAuthType(r, bucket, "s3:GetBucketLocation", globalMinioDefaultRegion) if s3Error == ErrInvalidRegion { // Clients like boto3 send getBucketLocation() call signed with region that is configured. s3Error = checkRequestAuthType(r, "", "s3:GetBucketLocation", globalServerConfig.GetRegion()) } if s3Error != ErrNone { writeErrorResponse(w, s3Error, r.URL) return } bucketLock := globalNSMutex.NewNSLock(bucket, "") if err := bucketLock.GetRLock(globalObjectTimeout); err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } defer bucketLock.RUnlock() if _, err := objectAPI.GetBucketInfo(bucket); err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } // Generate response. encodedSuccessResponse := encodeResponse(LocationResponse{}) // Get current region. region := globalServerConfig.GetRegion() if region != globalMinioDefaultRegion { encodedSuccessResponse = encodeResponse(LocationResponse{ Location: region, }) } // Write success response. writeSuccessResponseXML(w, encodedSuccessResponse) } // ListMultipartUploadsHandler - GET Bucket (List Multipart uploads) // ------------------------- // This operation lists in-progress multipart uploads. An in-progress // multipart upload is a multipart upload that has been initiated, // using the Initiate Multipart Upload request, but has not yet been // completed or aborted. This operation returns at most 1,000 multipart // uploads in the response. // func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) bucket := vars["bucket"] objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } if s3Error := checkRequestAuthType(r, bucket, "s3:ListBucketMultipartUploads", globalServerConfig.GetRegion()); s3Error != ErrNone { writeErrorResponse(w, s3Error, r.URL) return } prefix, keyMarker, uploadIDMarker, delimiter, maxUploads, _ := getBucketMultipartResources(r.URL.Query()) if maxUploads < 0 { writeErrorResponse(w, ErrInvalidMaxUploads, r.URL) return } if keyMarker != "" { // Marker not common with prefix is not implemented. if !hasPrefix(keyMarker, prefix) { writeErrorResponse(w, ErrNotImplemented, r.URL) return } } listMultipartsInfo, err := objectAPI.ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads) if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } // generate response response := generateListMultipartUploadsResponse(bucket, listMultipartsInfo) encodedSuccessResponse := encodeResponse(response) // write success response. writeSuccessResponseXML(w, encodedSuccessResponse) } // ListBucketsHandler - GET Service. // ----------- // This implementation of the GET operation returns a list of all buckets // owned by the authenticated sender of the request. func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.Request) { objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } // ListBuckets does not have any bucket action. s3Error := checkRequestAuthType(r, "", "", globalMinioDefaultRegion) if s3Error == ErrInvalidRegion { // Clients like boto3 send listBuckets() call signed with region that is configured. s3Error = checkRequestAuthType(r, "", "", globalServerConfig.GetRegion()) } if s3Error != ErrNone { writeErrorResponse(w, s3Error, r.URL) return } // Invoke the list buckets. bucketsInfo, err := objectAPI.ListBuckets() if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } // Generate response. response := generateListBucketsResponse(bucketsInfo) encodedSuccessResponse := encodeResponse(response) // Write response. writeSuccessResponseXML(w, encodedSuccessResponse) } // DeleteMultipleObjectsHandler - deletes multiple objects. func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) bucket := vars["bucket"] objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } var authError APIErrorCode if authError = checkRequestAuthType(r, bucket, "s3:DeleteObject", globalServerConfig.GetRegion()); authError != ErrNone { // In the event access is denied, a 200 response should still be returned // http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html if authError != ErrAccessDenied { writeErrorResponse(w, authError, r.URL) return } } // Content-Length is required and should be non-zero // http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html if r.ContentLength <= 0 { writeErrorResponse(w, ErrMissingContentLength, r.URL) return } // Content-Md5 is requied should be set // http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html if _, ok := r.Header["Content-Md5"]; !ok { writeErrorResponse(w, ErrMissingContentMD5, r.URL) return } // Allocate incoming content length bytes. deleteXMLBytes := make([]byte, r.ContentLength) // Read incoming body XML bytes. if _, err := io.ReadFull(r.Body, deleteXMLBytes); err != nil { errorIf(err, "Unable to read HTTP body.") writeErrorResponse(w, ErrInternalError, r.URL) return } // Unmarshal list of keys to be deleted. deleteObjects := &DeleteObjectsRequest{} if err := xml.Unmarshal(deleteXMLBytes, deleteObjects); err != nil { errorIf(err, "Unable to unmarshal delete objects request XML.") writeErrorResponse(w, ErrMalformedXML, r.URL) return } var wg = &sync.WaitGroup{} // Allocate a new wait group. var dErrs = make([]error, len(deleteObjects.Objects)) // Delete all requested objects in parallel. for index, object := range deleteObjects.Objects { wg.Add(1) go func(i int, obj ObjectIdentifier) { defer wg.Done() // If the request is denied access, each item // should be marked as 'AccessDenied' if authError == ErrAccessDenied { dErrs[i] = PrefixAccessDenied{ Bucket: bucket, Object: obj.ObjectName, } return } dErr := objectAPI.DeleteObject(bucket, obj.ObjectName) if dErr != nil { dErrs[i] = dErr } }(index, object) } wg.Wait() // Collect deleted objects and errors if any. var deletedObjects []ObjectIdentifier var deleteErrors []DeleteError for index, err := range dErrs { object := deleteObjects.Objects[index] // Success deleted objects are collected separately. if err == nil { deletedObjects = append(deletedObjects, object) continue } if _, ok := errors.Cause(err).(ObjectNotFound); ok { // If the object is not found it should be // accounted as deleted as per S3 spec. deletedObjects = append(deletedObjects, object) continue } // Error during delete should be collected separately. deleteErrors = append(deleteErrors, DeleteError{ Code: errorCodeResponse[toAPIErrorCode(err)].Code, Message: errorCodeResponse[toAPIErrorCode(err)].Description, Key: object.ObjectName, }) } // Generate response response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors) encodedSuccessResponse := encodeResponse(response) // Write success response. writeSuccessResponseXML(w, encodedSuccessResponse) // Get host and port from Request.RemoteAddr failing which // fill them with empty strings. host, port, err := net.SplitHostPort(r.RemoteAddr) if err != nil { host, port = "", "" } // Notify deleted event for objects. for _, dobj := range deletedObjects { eventNotify(eventData{ Type: ObjectRemovedDelete, Bucket: bucket, ObjInfo: ObjectInfo{ Name: dobj.ObjectName, }, ReqParams: extractReqParams(r), UserAgent: r.UserAgent(), Host: host, Port: port, }) } } // PutBucketHandler - PUT Bucket // ---------- // This implementation of the PUT operation creates a new bucket for authenticated request func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Request) { objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } // PutBucket does not have any bucket action. s3Error := checkRequestAuthType(r, "", "", globalServerConfig.GetRegion()) if s3Error != ErrNone { writeErrorResponse(w, s3Error, r.URL) return } vars := mux.Vars(r) bucket := vars["bucket"] // Parse incoming location constraint. location, s3Error := parseLocationConstraint(r) if s3Error != ErrNone { writeErrorResponse(w, s3Error, r.URL) return } // Validate if location sent by the client is valid, reject // requests which do not follow valid region requirements. if !isValidLocation(location) { writeErrorResponse(w, ErrInvalidRegion, r.URL) return } bucketLock := globalNSMutex.NewNSLock(bucket, "") if err := bucketLock.GetLock(globalObjectTimeout); err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } defer bucketLock.Unlock() // Proceed to creating a bucket. err := objectAPI.MakeBucketWithLocation(bucket, "") if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } // Make sure to add Location information here only for bucket w.Header().Set("Location", getLocation(r)) writeSuccessResponseHeadersOnly(w) } // PostPolicyBucketHandler - POST policy // ---------- // This implementation of the POST operation handles object creation with a specified // signature policy in multipart/form-data func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *http.Request) { objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } bucket := mux.Vars(r)["bucket"] // Require Content-Length to be set in the request size := r.ContentLength if size < 0 { writeErrorResponse(w, ErrMissingContentLength, r.URL) return } resource, err := getResource(r.URL.Path, r.Host, globalDomainName) if err != nil { writeErrorResponse(w, ErrInvalidRequest, r.URL) return } // Make sure that the URL does not contain object name. if bucket != filepath.Clean(resource[1:]) { writeErrorResponse(w, ErrMethodNotAllowed, r.URL) return } // Here the parameter is the size of the form data that should // be loaded in memory, the remaining being put in temporary files. reader, err := r.MultipartReader() if err != nil { errorIf(err, "Unable to initialize multipart reader.") writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL) return } // Read multipart data and save in memory and in the disk if needed form, err := reader.ReadForm(maxFormMemory) if err != nil { errorIf(err, "Unable to initialize multipart reader.") writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL) return } // Remove all tmp files creating during multipart upload defer form.RemoveAll() // Extract all form fields fileBody, fileName, fileSize, formValues, err := extractPostPolicyFormValues(form) if err != nil { errorIf(err, "Unable to parse form values.") writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL) return } // Check if file is provided, error out otherwise. if fileBody == nil { writeErrorResponse(w, ErrPOSTFileRequired, r.URL) return } // Close multipart file defer fileBody.Close() formValues.Set("Bucket", bucket) if fileName != "" && strings.Contains(formValues.Get("Key"), "${filename}") { // S3 feature to replace ${filename} found in Key form field // by the filename attribute passed in multipart formValues.Set("Key", strings.Replace(formValues.Get("Key"), "${filename}", fileName, -1)) } object := formValues.Get("Key") successRedirect := formValues.Get("success_action_redirect") successStatus := formValues.Get("success_action_status") var redirectURL *url.URL if successRedirect != "" { redirectURL, err = url.Parse(successRedirect) if err != nil { writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL) return } } // Verify policy signature. apiErr := doesPolicySignatureMatch(formValues) if apiErr != ErrNone { writeErrorResponse(w, apiErr, r.URL) return } policyBytes, err := base64.StdEncoding.DecodeString(formValues.Get("Policy")) if err != nil { writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL) return } postPolicyForm, err := parsePostPolicyForm(string(policyBytes)) if err != nil { writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL) return } // Make sure formValues adhere to policy restrictions. if apiErr = checkPostPolicy(formValues, postPolicyForm); apiErr != ErrNone { writeErrorResponse(w, apiErr, r.URL) return } // Ensure that the object size is within expected range, also the file size // should not exceed the maximum single Put size (5 GiB) lengthRange := postPolicyForm.Conditions.ContentLengthRange if lengthRange.Valid { if fileSize < lengthRange.Min { writeErrorResponse(w, toAPIErrorCode(errDataTooSmall), r.URL) return } if fileSize > lengthRange.Max || isMaxObjectSize(fileSize) { writeErrorResponse(w, toAPIErrorCode(errDataTooLarge), r.URL) return } } // Extract metadata to be saved from received Form. metadata, err := extractMetadataFromHeader(formValues) if err != nil { errorIf(err, "found invalid http request header") writeErrorResponse(w, ErrInternalError, r.URL) return } hashReader, err := hash.NewReader(fileBody, fileSize, "", "") if err != nil { errorIf(err, "Unable to initialize hashReader.") writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } if objectAPI.IsEncryptionSupported() { if hasSSECustomerHeader(formValues) && !hasSuffix(object, slashSeparator) { // handle SSE-C requests var reader io.Reader var key []byte key, err = ParseSSECustomerHeader(formValues) if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } reader, err = newEncryptReader(hashReader, key, metadata) if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } info := ObjectInfo{Size: fileSize} hashReader, err = hash.NewReader(reader, info.EncryptedSize(), "", "") // do not try to verify encrypted content if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } } } objInfo, err := objectAPI.PutObject(bucket, object, hashReader, metadata) if err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } location := getObjectLocation(r, globalDomainName, bucket, object) w.Header().Set("ETag", `"`+objInfo.ETag+`"`) w.Header().Set("Location", location) // Get host and port from Request.RemoteAddr. host, port, err := net.SplitHostPort(r.RemoteAddr) if err != nil { host, port = "", "" } // Notify object created event. defer eventNotify(eventData{ Type: ObjectCreatedPost, Bucket: objInfo.Bucket, ObjInfo: objInfo, ReqParams: extractReqParams(r), UserAgent: r.UserAgent(), Host: host, Port: port, }) if successRedirect != "" { // Replace raw query params.. redirectURL.RawQuery = getRedirectPostRawQuery(objInfo) writeRedirectSeeOther(w, redirectURL.String()) return } // Decide what http response to send depending on success_action_status parameter switch successStatus { case "201": resp := encodeResponse(PostResponse{ Bucket: objInfo.Bucket, Key: objInfo.Name, ETag: `"` + objInfo.ETag + `"`, Location: location, }) writeResponse(w, http.StatusCreated, resp, "application/xml") case "200": writeSuccessResponseHeadersOnly(w) default: writeSuccessNoContent(w) } } // HeadBucketHandler - HEAD Bucket // ---------- // This operation is useful to determine if a bucket exists. // The operation returns a 200 OK if the bucket exists and you // have permission to access it. Otherwise, the operation might // return responses such as 404 Not Found and 403 Forbidden. func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) bucket := vars["bucket"] objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponseHeadersOnly(w, ErrServerNotInitialized) return } if s3Error := checkRequestAuthType(r, bucket, "s3:ListBucket", globalServerConfig.GetRegion()); s3Error != ErrNone { writeErrorResponseHeadersOnly(w, s3Error) return } if _, err := objectAPI.GetBucketInfo(bucket); err != nil { writeErrorResponseHeadersOnly(w, toAPIErrorCode(err)) return } writeSuccessResponseHeadersOnly(w) } // DeleteBucketHandler - Delete bucket func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) { objectAPI := api.ObjectAPI() if objectAPI == nil { writeErrorResponse(w, ErrServerNotInitialized, r.URL) return } // DeleteBucket does not have any bucket action. if s3Error := checkRequestAuthType(r, "", "", globalServerConfig.GetRegion()); s3Error != ErrNone { writeErrorResponse(w, s3Error, r.URL) return } vars := mux.Vars(r) bucket := vars["bucket"] // Attempt to delete bucket. if err := objectAPI.DeleteBucket(bucket); err != nil { writeErrorResponse(w, toAPIErrorCode(err), r.URL) return } // Write success response. writeSuccessNoContent(w) }