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minio/bucket-handlers.go

674 lines
21 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016 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 main
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/hex"
"encoding/xml"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"net/url"
"strings"
mux "github.com/gorilla/mux"
"github.com/minio/minio/pkg/crypto/sha256"
"github.com/minio/minio/pkg/fs"
"github.com/minio/minio/pkg/probe"
"github.com/minio/minio/pkg/s3/access"
"github.com/minio/minio/pkg/s3/signature4"
)
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
func enforceBucketPolicy(action string, bucket string, reqURL *url.URL) (s3Error APIErrorCode) {
// Read saved bucket policy.
policy, err := readBucketPolicy(bucket)
if err != nil {
errorIf(err.Trace(bucket), "GetBucketPolicy failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNotFound:
return ErrNoSuchBucket
case fs.BucketNameInvalid:
return ErrInvalidBucketName
default:
// For any other error just return AccessDenied.
return ErrAccessDenied
}
}
// Parse the saved policy.
accessPolicy, e := accesspolicy.Validate(policy)
if e != nil {
errorIf(probe.NewError(e), "Parse policy failed.", nil)
return ErrAccessDenied
}
// Construct resource in 'arn:aws:s3:::examplebucket' format.
resource := accesspolicy.AWSResourcePrefix + strings.TrimPrefix(reqURL.Path, "/")
// Get conditions for policy verification.
conditions := make(map[string]string)
for queryParam := range reqURL.Query() {
conditions[queryParam] = reqURL.Query().Get("queryParam")
}
// Validate action, resource and conditions with current policy statements.
if !bucketPolicyEvalStatements(action, resource, conditions, accessPolicy.Statements) {
return ErrAccessDenied
}
return ErrNone
}
// GetBucketLocationHandler - GET Bucket location.
// -------------------------
// This operation returns bucket location.
func (api storageAPI) GetBucketLocationHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
if s3Error := enforceBucketPolicy("s3:GetBucketLocation", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypeSigned, authTypePresigned:
if s3Error := isReqAuthenticated(api.Signature, r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
}
_, err := api.Filesystem.GetBucketInfo(bucket)
if err != nil {
errorIf(err.Trace(), "GetBucketInfo failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNotFound:
writeErrorResponse(w, r, ErrNoSuchBucket, r.URL.Path)
case fs.BucketNameInvalid:
writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
default:
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
return
}
// Generate response.
encodedSuccessResponse := encodeResponse(LocationResponse{})
if api.Region != "us-east-1" {
encodedSuccessResponse = encodeResponse(LocationResponse{
Location: api.Region,
})
}
setCommonHeaders(w) // write headers.
writeSuccessResponse(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 storageAPI) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
if s3Error := enforceBucketPolicy("s3:ListBucketMultipartUploads", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypePresigned, authTypeSigned:
if s3Error := isReqAuthenticated(api.Signature, r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
}
resources := getBucketMultipartResources(r.URL.Query())
if resources.MaxUploads < 0 {
writeErrorResponse(w, r, ErrInvalidMaxUploads, r.URL.Path)
return
}
if resources.MaxUploads == 0 {
resources.MaxUploads = maxObjectList
}
resources, err := api.Filesystem.ListMultipartUploads(bucket, resources)
if err != nil {
errorIf(err.Trace(), "ListMultipartUploads failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNotFound:
writeErrorResponse(w, r, ErrNoSuchBucket, r.URL.Path)
default:
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
return
}
// generate response
response := generateListMultipartUploadsResponse(bucket, resources)
encodedSuccessResponse := encodeResponse(response)
// write headers.
setCommonHeaders(w)
// write success response.
writeSuccessResponse(w, encodedSuccessResponse)
}
// ListObjectsHandler - GET Bucket (List Objects)
// -- -----------------------
// This implementation of the GET operation returns some or all (up to 1000)
// of the objects in a bucket. You can use the request parameters as selection
// criteria to return a subset of the objects in a bucket.
//
func (api storageAPI) ListObjectsHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
if s3Error := enforceBucketPolicy("s3:ListBucket", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypeSigned, authTypePresigned:
if s3Error := isReqAuthenticated(api.Signature, r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
}
// TODO handle encoding type.
prefix, marker, delimiter, maxkeys, _ := getBucketResources(r.URL.Query())
if maxkeys < 0 {
writeErrorResponse(w, r, ErrInvalidMaxKeys, r.URL.Path)
return
}
if maxkeys == 0 {
maxkeys = maxObjectList
}
listResp, err := api.Filesystem.ListObjects(bucket, prefix, marker, delimiter, maxkeys)
if err == nil {
// generate response
response := generateListObjectsResponse(bucket, prefix, marker, delimiter, maxkeys, listResp)
encodedSuccessResponse := encodeResponse(response)
// Write headers
setCommonHeaders(w)
// Write success response.
writeSuccessResponse(w, encodedSuccessResponse)
return
}
switch err.ToGoError().(type) {
case fs.BucketNameInvalid:
writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
case fs.BucketNotFound:
writeErrorResponse(w, r, ErrNoSuchBucket, r.URL.Path)
case fs.ObjectNotFound:
writeErrorResponse(w, r, ErrNoSuchKey, r.URL.Path)
case fs.ObjectNameInvalid:
writeErrorResponse(w, r, ErrNoSuchKey, r.URL.Path)
default:
errorIf(err.Trace(), "ListObjects failed.", nil)
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
}
// 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 storageAPI) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
// List buckets does not support bucket policies.
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeSigned, authTypePresigned:
if s3Error := isReqAuthenticated(api.Signature, r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
}
buckets, err := api.Filesystem.ListBuckets()
if err == nil {
// generate response
response := generateListBucketsResponse(buckets)
encodedSuccessResponse := encodeResponse(response)
// write headers
setCommonHeaders(w)
// write response
writeSuccessResponse(w, encodedSuccessResponse)
return
}
errorIf(err.Trace(), "ListBuckets failed.", nil)
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
// DeleteMultipleObjectsHandler - deletes multiple objects.
func (api storageAPI) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
// 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, r, ErrMissingContentLength, r.URL.Path)
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, r, ErrMissingContentMD5, r.URL.Path)
return
}
// Set http request for signature.
auth := api.Signature.SetHTTPRequestToVerify(r)
// Allocate incoming content length bytes.
deleteXMLBytes := make([]byte, r.ContentLength)
// Read incoming body XML bytes.
_, e := io.ReadFull(r.Body, deleteXMLBytes)
if e != nil {
errorIf(probe.NewError(e), "DeleteMultipleObjects failed.", nil)
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
return
}
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
if s3Error := enforceBucketPolicy("s3:DeleteObject", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypePresigned:
// Check if request is presigned.
ok, err := auth.DoesPresignedSignatureMatch()
if err != nil {
errorIf(err.Trace(r.URL.String()), "Presigned signature verification failed.", nil)
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
case authTypeSigned:
// Check if request is signed.
sha := sha256.New()
mdSh := md5.New()
sha.Write(deleteXMLBytes)
mdSh.Write(deleteXMLBytes)
ok, err := auth.DoesSignatureMatch(hex.EncodeToString(sha.Sum(nil)))
if err != nil {
errorIf(err.Trace(), "DeleteMultipleObjects failed.", nil)
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
// Verify content md5.
if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(mdSh.Sum(nil)) {
writeErrorResponse(w, r, ErrBadDigest, r.URL.Path)
return
}
}
// Unmarshal list of keys to be deleted.
deleteObjects := &DeleteObjectsRequest{}
if e := xml.Unmarshal(deleteXMLBytes, deleteObjects); e != nil {
writeErrorResponse(w, r, ErrMalformedXML, r.URL.Path)
return
}
var deleteErrors []DeleteError
var deletedObjects []ObjectIdentifier
// Loop through all the objects and delete them sequentially.
for _, object := range deleteObjects.Objects {
err := api.Filesystem.DeleteObject(bucket, object.ObjectName)
if err == nil {
deletedObjects = append(deletedObjects, ObjectIdentifier{
ObjectName: object.ObjectName,
})
} else {
errorIf(err.Trace(object.ObjectName), "DeleteObject failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNameInvalid:
deleteErrors = append(deleteErrors, DeleteError{
Code: errorCodeResponse[ErrInvalidBucketName].Code,
Message: errorCodeResponse[ErrInvalidBucketName].Description,
Key: object.ObjectName,
})
case fs.BucketNotFound:
deleteErrors = append(deleteErrors, DeleteError{
Code: errorCodeResponse[ErrNoSuchBucket].Code,
Message: errorCodeResponse[ErrNoSuchBucket].Description,
Key: object.ObjectName,
})
case fs.ObjectNotFound:
deleteErrors = append(deleteErrors, DeleteError{
Code: errorCodeResponse[ErrNoSuchKey].Code,
Message: errorCodeResponse[ErrNoSuchKey].Description,
Key: object.ObjectName,
})
case fs.ObjectNameInvalid:
deleteErrors = append(deleteErrors, DeleteError{
Code: errorCodeResponse[ErrNoSuchKey].Code,
Message: errorCodeResponse[ErrNoSuchKey].Description,
Key: object.ObjectName,
})
default:
deleteErrors = append(deleteErrors, DeleteError{
Code: errorCodeResponse[ErrInternalError].Code,
Message: errorCodeResponse[ErrInternalError].Description,
Key: object.ObjectName,
})
}
}
}
// Generate response
response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
encodedSuccessResponse := encodeResponse(response)
// Write headers
setCommonHeaders(w)
// Write success response.
writeSuccessResponse(w, encodedSuccessResponse)
}
// PutBucketHandler - PUT Bucket
// ----------
// This implementation of the PUT operation creates a new bucket for authenticated request
func (api storageAPI) PutBucketHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
// Set http request for signature.
auth := api.Signature.SetHTTPRequestToVerify(r)
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
if s3Error := enforceBucketPolicy("s3:CreateBucket", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypePresigned:
ok, err := auth.DoesPresignedSignatureMatch()
if err != nil {
errorIf(err.Trace(r.URL.String()), "Presigned signature verification failed.", nil)
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
case authTypeSigned:
// Verify signature for the incoming body if any.
locationBytes, e := ioutil.ReadAll(r.Body)
if e != nil {
errorIf(probe.NewError(e), "MakeBucket failed.", nil)
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
return
}
sh := sha256.New()
sh.Write(locationBytes)
ok, err := auth.DoesSignatureMatch(hex.EncodeToString(sh.Sum(nil)))
if err != nil {
errorIf(err.Trace(), "MakeBucket failed.", nil)
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
}
// Make bucket.
err := api.Filesystem.MakeBucket(bucket)
if err != nil {
errorIf(err.Trace(), "MakeBucket failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNameInvalid:
writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
case fs.BucketExists:
writeErrorResponse(w, r, ErrBucketAlreadyExists, r.URL.Path)
default:
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
return
}
// Make sure to add Location information here only for bucket
w.Header().Set("Location", getLocation(r))
writeSuccessResponse(w, nil)
}
func extractHTTPFormValues(reader *multipart.Reader) (io.Reader, map[string]string, *probe.Error) {
/// HTML Form values
formValues := make(map[string]string)
filePart := new(bytes.Buffer)
var e error
for e == nil {
var part *multipart.Part
part, e = reader.NextPart()
if part != nil {
if part.FileName() == "" {
buffer, e := ioutil.ReadAll(part)
if e != nil {
return nil, nil, probe.NewError(e)
}
formValues[http.CanonicalHeaderKey(part.FormName())] = string(buffer)
} else {
if _, e := io.Copy(filePart, part); e != nil {
return nil, nil, probe.NewError(e)
}
}
}
}
return filePart, formValues, nil
}
// PostPolicyBucketHandler - POST policy
// ----------
// This implementation of the POST operation handles object creation with a specified
// signature policy in multipart/form-data
func (api storageAPI) PostPolicyBucketHandler(w http.ResponseWriter, r *http.Request) {
// Here the parameter is the size of the form data that should
// be loaded in memory, the remaining being put in temporary
// files
reader, e := r.MultipartReader()
if e != nil {
errorIf(probe.NewError(e), "Unable to initialize multipart reader.", nil)
writeErrorResponse(w, r, ErrMalformedPOSTRequest, r.URL.Path)
return
}
fileBody, formValues, err := extractHTTPFormValues(reader)
if err != nil {
errorIf(err.Trace(), "Unable to parse form values.", nil)
writeErrorResponse(w, r, ErrMalformedPOSTRequest, r.URL.Path)
return
}
bucket := mux.Vars(r)["bucket"]
formValues["Bucket"] = bucket
object := formValues["Key"]
var ok bool
// Set http request for signature.
auth := api.Signature.SetHTTPRequestToVerify(r)
// Verify policy signature.
ok, err = auth.DoesPolicySignatureMatch(formValues)
if err != nil {
errorIf(err.Trace(), "Unable to verify signature.", nil)
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, ErrSignatureDoesNotMatch, r.URL.Path)
return
}
if err = signature4.ApplyPolicyCond(formValues); err != nil {
errorIf(err.Trace(), "Invalid request, policy doesn't match with the endpoint.", nil)
writeErrorResponse(w, r, ErrMalformedPOSTRequest, r.URL.Path)
return
}
objectInfo, err := api.Filesystem.CreateObject(bucket, object, "", -1, fileBody, nil)
if err != nil {
errorIf(err.Trace(), "CreateObject failed.", nil)
switch err.ToGoError().(type) {
case fs.RootPathFull:
writeErrorResponse(w, r, ErrRootPathFull, r.URL.Path)
case fs.BucketNotFound:
writeErrorResponse(w, r, ErrNoSuchBucket, r.URL.Path)
case fs.BucketNameInvalid:
writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
case fs.BadDigest:
writeErrorResponse(w, r, ErrBadDigest, r.URL.Path)
case fs.IncompleteBody:
writeErrorResponse(w, r, ErrIncompleteBody, r.URL.Path)
case fs.InvalidDigest:
writeErrorResponse(w, r, ErrInvalidDigest, r.URL.Path)
default:
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
return
}
if objectInfo.MD5Sum != "" {
w.Header().Set("ETag", "\""+objectInfo.MD5Sum+"\"")
}
writeSuccessResponse(w, nil)
}
// 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 storageAPI) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypePresigned, authTypeSigned:
if s3Error := isReqAuthenticated(api.Signature, r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
}
_, err := api.Filesystem.GetBucketInfo(bucket)
if err != nil {
errorIf(err.Trace(), "GetBucketInfo failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNotFound:
writeErrorResponse(w, r, ErrNoSuchBucket, r.URL.Path)
case fs.BucketNameInvalid:
writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
default:
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
return
}
writeSuccessResponse(w, nil)
}
// DeleteBucketHandler - Delete bucket
func (api storageAPI) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
bucket := vars["bucket"]
switch getRequestAuthType(r) {
default:
// For all unknown auth types return error.
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
if s3Error := enforceBucketPolicy("s3:DeleteBucket", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypePresigned, authTypeSigned:
if s3Error := isReqAuthenticated(api.Signature, r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
}
err := api.Filesystem.DeleteBucket(bucket)
if err != nil {
errorIf(err.Trace(), "DeleteBucket failed.", nil)
switch err.ToGoError().(type) {
case fs.BucketNotFound:
writeErrorResponse(w, r, ErrNoSuchBucket, r.URL.Path)
case fs.BucketNotEmpty:
writeErrorResponse(w, r, ErrBucketNotEmpty, r.URL.Path)
default:
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
}
return
}
// Delete bucket access policy, if present - ignore any errors.
removeBucketPolicy(bucket)
// Write success response.
writeSuccessNoContent(w)
}