// getStringToSign a string based on selected query values.
func (s Signature) getStringToSign(canonicalRequest string, t time.Time) string {
stringToSign := signV4Algorithm + "\n" + t.Format(iso8601Format) + "\n"
stringToSign = stringToSign + s.getScope(t) + "\n"
canonicalRequestBytes := sha256.Sum256([]byte(canonicalRequest))
stringToSign = stringToSign + hex.EncodeToString(canonicalRequestBytes[:])
return stringToSign
}
// getStringToSign a string based on selected query values
func (r Signature) getStringToSign(canonicalRequest string, t time.Time) string {
stringToSign := authHeaderPrefix + "\n" + t.Format(iso8601Format) + "\n"
stringToSign = stringToSign + r.getScope(t) + "\n"
canonicalRequestBytes := sha256.Sum256([]byte(canonicalRequest))
stringToSign = stringToSign + hex.EncodeToString(canonicalRequestBytes[:])
return stringToSign
}
// MakeBucket - create bucket in cache
func (xl API) MakeBucket(bucketName, acl string, location io.Reader, signature *signV4.Signature) *probe.Error {
xl.lock.Lock()
defer xl.lock.Unlock()
// do not have to parse location constraint, using this just for signature verification
locationSum := "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
if location != nil {
locationConstraintBytes, err := ioutil.ReadAll(location)
if err != nil {
return probe.NewError(InternalError{})
}
locationConstraintHashBytes := sha256.Sum256(locationConstraintBytes)
locationSum = hex.EncodeToString(locationConstraintHashBytes[:])
}
if signature != nil {
ok, err := signature.DoesSignatureMatch(locationSum)
if err != nil {
return err.Trace()
}
if !ok {
return probe.NewError(SignDoesNotMatch{})
}
}
if xl.storedBuckets.Stats().Items == totalBuckets {
return probe.NewError(TooManyBuckets{Bucket: bucketName})
}
if !IsValidBucket(bucketName) {
return probe.NewError(BucketNameInvalid{Bucket: bucketName})
}
if !IsValidBucketACL(acl) {
return probe.NewError(InvalidACL{ACL: acl})
}
if xl.storedBuckets.Exists(bucketName) {
return probe.NewError(BucketExists{Bucket: bucketName})
}
if strings.TrimSpace(acl) == "" {
// default is private
acl = "private"
}
if len(xl.config.NodeDiskMap) > 0 {
if err := xl.makeBucket(bucketName, BucketACL(acl)); err != nil {
return err.Trace()
}
}
var newBucket = storedBucket{}
newBucket.objectMetadata = make(map[string]ObjectMetadata)
newBucket.multiPartSession = make(map[string]MultiPartSession)
newBucket.partMetadata = make(map[string]map[int]PartMetadata)
newBucket.bucketMetadata = BucketMetadata{}
newBucket.bucketMetadata.Name = bucketName
newBucket.bucketMetadata.Created = time.Now().UTC()
newBucket.bucketMetadata.ACL = BucketACL(acl)
xl.storedBuckets.Set(bucketName, newBucket)
return nil
}
func (xl API) completeMultipartUploadV2(bucket, key, uploadID string, data io.Reader, signature *signV4.Signature) (io.Reader, *probe.Error) {
if !IsValidBucket(bucket) {
return nil, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
if !IsValidObjectName(key) {
return nil, probe.NewError(ObjectNameInvalid{Object: key})
}
// TODO: multipart support for xl is broken, since we haven't finalized the format in which
// it can be stored, disabling this for now until we get the underlying layout stable.
//
// if len(xl.config.NodeDiskMap) > 0 {
// xl.lock.Unlock()
// return xl.completeMultipartUpload(bucket, key, uploadID, data, signature)
// }
if !xl.storedBuckets.Exists(bucket) {
return nil, probe.NewError(BucketNotFound{Bucket: bucket})
}
storedBucket := xl.storedBuckets.Get(bucket).(storedBucket)
// Verify upload id
if storedBucket.multiPartSession[key].UploadID != uploadID {
return nil, probe.NewError(InvalidUploadID{UploadID: uploadID})
}
partBytes, err := ioutil.ReadAll(data)
if err != nil {
return nil, probe.NewError(err)
}
if signature != nil {
partHashBytes := sha256.Sum256(partBytes)
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(partHashBytes[:]))
if err != nil {
return nil, err.Trace()
}
if !ok {
return nil, probe.NewError(signV4.SigDoesNotMatch{})
}
}
parts := &CompleteMultipartUpload{}
if err := xml.Unmarshal(partBytes, parts); err != nil {
return nil, probe.NewError(MalformedXML{})
}
if !sort.IsSorted(completedParts(parts.Part)) {
return nil, probe.NewError(InvalidPartOrder{})
}
fullObjectReader, fullObjectWriter := io.Pipe()
go xl.mergeMultipart(parts, uploadID, fullObjectWriter)
return fullObjectReader, nil
}
// getHashedPayload get the hexadecimal value of the SHA256 hash of the request payload
func (r *request) getHashedPayload() string {
hash := func() string {
switch {
case r.body == nil:
return hex.EncodeToString(sha256.Sum256([]byte{}))
default:
sum256Bytes, _ := sha256.Sum(r.body)
return hex.EncodeToString(sum256Bytes)
}
}
hashedPayload := hash()
r.calculatedReq.Header.Set("x-amz-content-sha256", hashedPayload)
return hashedPayload
}
func (s rpcSignatureHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var signature *rpcSignature
if isRequestSignatureRPC(r) {
// Init signature V4 verification
var err *probe.Error
signature, err = initSignatureRPC(r)
if err != nil {
switch err.ToGoError() {
case errInvalidRegion:
errorIf(err.Trace(), "Unknown region in authorization header.", nil)
writeErrorResponse(w, r, AuthorizationHeaderMalformed, r.URL.Path)
return
case errAccessKeyIDInvalid:
errorIf(err.Trace(), "Invalid access key id.", nil)
writeErrorResponse(w, r, InvalidAccessKeyID, r.URL.Path)
return
default:
errorIf(err.Trace(), "Initializing signature v4 failed.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
}
buffer := new(bytes.Buffer)
if _, err := io.Copy(buffer, r.Body); err != nil {
errorIf(probe.NewError(err), "Unable to read payload from request body.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
value := sha256.Sum256(buffer.Bytes())
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(value[:]))
if err != nil {
errorIf(err.Trace(), "Unable to verify signature.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, SignatureDoesNotMatch, r.URL.Path)
return
}
// Copy the buffer back into request body to be read by the RPC service callers
r.Body = ioutil.NopCloser(buffer)
s.handler.ServeHTTP(w, r)
} else {
writeErrorResponse(w, r, AccessDenied, r.URL.Path)
}
}
// CompleteMultipartUpload - complete a multipart upload and persist the data
func (donut API) CompleteMultipartUpload(bucket, key, uploadID string, data io.Reader, signature *Signature) (ObjectMetadata, error) {
donut.lock.Lock()
if !IsValidBucket(bucket) {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(BucketNameInvalid{Bucket: bucket}, nil)
}
if !IsValidObjectName(key) {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(ObjectNameInvalid{Object: key}, nil)
}
if !donut.storedBuckets.Exists(bucket) {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(BucketNotFound{Bucket: bucket}, nil)
}
storedBucket := donut.storedBuckets.Get(bucket).(storedBucket)
// Verify upload id
if storedBucket.multiPartSession[key].uploadID != uploadID {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(InvalidUploadID{UploadID: uploadID}, nil)
}
partBytes, err := ioutil.ReadAll(data)
if err != nil {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(err, nil)
}
if signature != nil {
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(sha256.Sum256(partBytes)[:]))
if err != nil {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(err, nil)
}
if !ok {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(SignatureDoesNotMatch{}, nil)
}
}
parts := &CompleteMultipartUpload{}
if err := xml.Unmarshal(partBytes, parts); err != nil {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(MalformedXML{}, nil)
}
if !sort.IsSorted(completedParts(parts.Part)) {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(InvalidPartOrder{}, nil)
}
var size int64
var fullObject bytes.Buffer
for i := 1; i <= len(parts.Part); i++ {
recvMD5 := parts.Part[i-1].ETag
object, ok := donut.multiPartObjects[uploadID].Get(parts.Part[i-1].PartNumber)
if ok == false {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(errors.New("missing part: "+strconv.Itoa(i)), nil)
}
size += int64(len(object))
calcMD5Bytes := md5.Sum(object)
// complete multi part request header md5sum per part is hex encoded
recvMD5Bytes, err := hex.DecodeString(strings.Trim(recvMD5, "\""))
if err != nil {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(InvalidDigest{Md5: recvMD5}, nil)
}
if !bytes.Equal(recvMD5Bytes, calcMD5Bytes[:]) {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(BadDigest{}, nil)
}
_, err = io.Copy(&fullObject, bytes.NewBuffer(object))
if err != nil {
donut.lock.Unlock()
return ObjectMetadata{}, iodine.New(err, nil)
}
object = nil
go debug.FreeOSMemory()
}
md5sumSlice := md5.Sum(fullObject.Bytes())
// this is needed for final verification inside CreateObject, do not convert this to hex
md5sum := base64.StdEncoding.EncodeToString(md5sumSlice[:])
donut.lock.Unlock()
objectMetadata, err := donut.CreateObject(bucket, key, md5sum, size, &fullObject, nil, nil)
if err != nil {
// No need to call internal cleanup functions here, caller will call AbortMultipartUpload()
// which would in-turn cleanup properly in accordance with S3 Spec
return ObjectMetadata{}, iodine.New(err, nil)
}
fullObject.Reset()
donut.lock.Lock()
donut.cleanupMultipartSession(bucket, key, uploadID)
donut.lock.Unlock()
return objectMetadata, nil
}
// completeMultipartUpload complete an incomplete multipart upload
func (xl API) completeMultipartUpload(bucket, object, uploadID string, data io.Reader, signature *signV4.Signature) (ObjectMetadata, *probe.Error) {
if bucket == "" || strings.TrimSpace(bucket) == "" {
return ObjectMetadata{}, probe.NewError(InvalidArgument{})
}
if object == "" || strings.TrimSpace(object) == "" {
return ObjectMetadata{}, probe.NewError(InvalidArgument{})
}
if err := xl.listXLBuckets(); err != nil {
return ObjectMetadata{}, err.Trace()
}
if _, ok := xl.buckets[bucket]; !ok {
return ObjectMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
allBuckets, err := xl.getXLBucketMetadata()
if err != nil {
return ObjectMetadata{}, err.Trace()
}
bucketMetadata := allBuckets.Buckets[bucket]
if _, ok := bucketMetadata.Multiparts[object]; !ok {
return ObjectMetadata{}, probe.NewError(InvalidUploadID{UploadID: uploadID})
}
if bucketMetadata.Multiparts[object].UploadID != uploadID {
return ObjectMetadata{}, probe.NewError(InvalidUploadID{UploadID: uploadID})
}
var partBytes []byte
{
var err error
partBytes, err = ioutil.ReadAll(data)
if err != nil {
return ObjectMetadata{}, probe.NewError(err)
}
}
if signature != nil {
partHashBytes := sha256.Sum256(partBytes)
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(partHashBytes[:]))
if err != nil {
return ObjectMetadata{}, err.Trace()
}
if !ok {
return ObjectMetadata{}, probe.NewError(signV4.SigDoesNotMatch{})
}
}
parts := &CompleteMultipartUpload{}
if err := xml.Unmarshal(partBytes, parts); err != nil {
return ObjectMetadata{}, probe.NewError(MalformedXML{})
}
if !sort.IsSorted(completedParts(parts.Part)) {
return ObjectMetadata{}, probe.NewError(InvalidPartOrder{})
}
for _, part := range parts.Part {
if strings.Trim(part.ETag, "\"") != bucketMetadata.Multiparts[object].Parts[strconv.Itoa(part.PartNumber)].ETag {
return ObjectMetadata{}, probe.NewError(InvalidPart{})
}
}
var finalETagBytes []byte
var finalSize int64
totalParts := strconv.Itoa(bucketMetadata.Multiparts[object].TotalParts)
for _, part := range bucketMetadata.Multiparts[object].Parts {
partETagBytes, err := hex.DecodeString(part.ETag)
if err != nil {
return ObjectMetadata{}, probe.NewError(err)
}
finalETagBytes = append(finalETagBytes, partETagBytes...)
finalSize += part.Size
}
finalETag := hex.EncodeToString(finalETagBytes)
objMetadata := ObjectMetadata{}
objMetadata.MD5Sum = finalETag + "-" + totalParts
objMetadata.Object = object
objMetadata.Bucket = bucket
objMetadata.Size = finalSize
objMetadata.Created = bucketMetadata.Multiparts[object].Parts[totalParts].LastModified
return objMetadata, nil
}
// completeMultipartUpload complete an incomplete multipart upload
func (donut API) completeMultipartUpload(bucket, object, uploadID string, data io.Reader, signature *Signature) (ObjectMetadata, error) {
errParams := map[string]string{
"bucket": bucket,
"object": object,
"uploadID": uploadID,
}
if bucket == "" || strings.TrimSpace(bucket) == "" {
return ObjectMetadata{}, iodine.New(InvalidArgument{}, errParams)
}
if object == "" || strings.TrimSpace(object) == "" {
return ObjectMetadata{}, iodine.New(InvalidArgument{}, errParams)
}
if err := donut.listDonutBuckets(); err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if _, ok := donut.buckets[bucket]; !ok {
return ObjectMetadata{}, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
}
allBuckets, err := donut.getDonutBucketMetadata()
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
bucketMetadata := allBuckets.Buckets[bucket]
if _, ok := bucketMetadata.Multiparts[object]; !ok {
return ObjectMetadata{}, iodine.New(InvalidUploadID{UploadID: uploadID}, errParams)
}
if bucketMetadata.Multiparts[object].UploadID != uploadID {
return ObjectMetadata{}, iodine.New(InvalidUploadID{UploadID: uploadID}, errParams)
}
partBytes, err := ioutil.ReadAll(data)
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if signature != nil {
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(sha256.Sum256(partBytes)[:]))
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if !ok {
return ObjectMetadata{}, iodine.New(SignatureDoesNotMatch{}, errParams)
}
}
parts := &CompleteMultipartUpload{}
if err := xml.Unmarshal(partBytes, parts); err != nil {
return ObjectMetadata{}, iodine.New(MalformedXML{}, errParams)
}
if !sort.IsSorted(completedParts(parts.Part)) {
return ObjectMetadata{}, iodine.New(InvalidPartOrder{}, errParams)
}
for _, part := range parts.Part {
if part.ETag != bucketMetadata.Multiparts[object].Parts[strconv.Itoa(part.PartNumber)].ETag {
return ObjectMetadata{}, iodine.New(InvalidPart{}, errParams)
}
}
var finalETagBytes []byte
var finalSize int64
totalParts := strconv.Itoa(bucketMetadata.Multiparts[object].TotalParts)
for _, part := range bucketMetadata.Multiparts[object].Parts {
partETagBytes, err := hex.DecodeString(part.ETag)
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
finalETagBytes = append(finalETagBytes, partETagBytes...)
finalSize += part.Size
}
finalETag := hex.EncodeToString(finalETagBytes)
objMetadata := ObjectMetadata{}
objMetadata.MD5Sum = finalETag + "-" + totalParts
objMetadata.Object = object
objMetadata.Bucket = bucket
objMetadata.Size = finalSize
objMetadata.Created = bucketMetadata.Multiparts[object].Parts[totalParts].LastModified
return objMetadata, nil
}
func (s signatureHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var signature *signv4.Signature
if isRequestSignatureV4(r) {
// For PUT and POST requests with payload, send the call upwards for verification.
// Or PUT and POST requests without payload, verify here.
if (r.Body == nil && (r.Method == "PUT" || r.Method == "POST")) || (r.Method != "PUT" && r.Method != "POST") {
// Init signature V4 verification
var err *probe.Error
signature, err = initSignatureV4(r)
if err != nil {
switch err.ToGoError() {
case errInvalidRegion:
errorIf(err.Trace(), "Unknown region in authorization header.", nil)
writeErrorResponse(w, r, AuthorizationHeaderMalformed, r.URL.Path)
return
case errAccessKeyIDInvalid:
errorIf(err.Trace(), "Invalid access key id.", nil)
writeErrorResponse(w, r, InvalidAccessKeyID, r.URL.Path)
return
default:
errorIf(err.Trace(), "Initializing signature v4 failed.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
}
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(sha256.Sum256([]byte(""))))
if err != nil {
errorIf(err.Trace(), "Unable to verify signature.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, SignatureDoesNotMatch, r.URL.Path)
return
}
}
s.handler.ServeHTTP(w, r)
return
}
if isRequestPresignedSignatureV4(r) {
var err *probe.Error
signature, err = initPresignedSignatureV4(r)
if err != nil {
switch err.ToGoError() {
case errAccessKeyIDInvalid:
errorIf(err.Trace(), "Invalid access key id requested.", nil)
writeErrorResponse(w, r, InvalidAccessKeyID, r.URL.Path)
return
default:
errorIf(err.Trace(), "Initializing signature v4 failed.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
}
ok, err := signature.DoesPresignedSignatureMatch()
if err != nil {
errorIf(err.Trace(), "Unable to verify signature.", nil)
writeErrorResponse(w, r, InternalError, r.URL.Path)
return
}
if !ok {
writeErrorResponse(w, r, SignatureDoesNotMatch, r.URL.Path)
return
}
s.handler.ServeHTTP(w, r)
}
writeErrorResponse(w, r, AccessDenied, r.URL.Path)
}
// getStringToSign a string based on selected query values
func (r *request) getStringToSign(canonicalRequest string, t time.Time) string {
stringToSign := authHeader + "\n" + t.Format(iso8601Format) + "\n"
stringToSign = stringToSign + r.getScope(t) + "\n"
stringToSign = stringToSign + hex.EncodeToString(sha256.Sum256([]byte(canonicalRequest)))
return stringToSign
}