signature: Region changes should be handled just like AWS. (#2805)

- PutBucket happens with 'us-east-1'.
- ListBuckets happens with any region.
- GetBucketLocation happens with 'us-east-1' and location is returned.

cmd/api-datatypes.go

@@ -28,7 +28,7 @@ type ObjectIdentifier struct {
 // createBucketConfiguration container for bucket configuration request from client.
 // Used for parsing the location from the request body for MakeBucketbucket.
 type createBucketLocationConfiguration struct {
-	XMLName  xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ CreateBucketConfiguration" json:"-"`
+	XMLName  xml.Name `xml:"CreateBucketConfiguration" json:"-"`
 	Location string   `xml:"LocationConstraint"`
 }
 

cmd/auth-handler.go

@@ -105,7 +105,7 @@ func sumMD5(data []byte) []byte {
 }
 
 // Verify if request has valid AWS Signature Version '4'.
-func isReqAuthenticated(r *http.Request) (s3Error APIErrorCode) {
+func isReqAuthenticated(r *http.Request, region string) (s3Error APIErrorCode) {
 	if r == nil {
 		return ErrInternalError
 	}
@@ -121,7 +121,6 @@ func isReqAuthenticated(r *http.Request) (s3Error APIErrorCode) {
 	}
 	// Populate back the payload.
 	r.Body = ioutil.NopCloser(bytes.NewReader(payload))
-	validateRegion := true // Validate region.
 	var sha256sum string
 	// Skips calculating sha256 on the payload on server,
 	// if client requested for it.
@@ -131,9 +130,9 @@ func isReqAuthenticated(r *http.Request) (s3Error APIErrorCode) {
 		sha256sum = hex.EncodeToString(sum256(payload))
 	}
 	if isRequestSignatureV4(r) {
-		return doesSignatureMatch(sha256sum, r, validateRegion)
+		return doesSignatureMatch(sha256sum, r, region)
 	} else if isRequestPresignedSignatureV4(r) {
-		return doesPresignedSignatureMatch(sha256sum, r, validateRegion)
+		return doesPresignedSignatureMatch(sha256sum, r, region)
 	}
 	return ErrAccessDenied
 }
@@ -145,13 +144,19 @@ func isReqAuthenticated(r *http.Request) (s3Error APIErrorCode) {
 // request headers and body are used to calculate the signature validating
 // the client signature present in request.
 func checkAuth(r *http.Request) APIErrorCode {
+	// Validates the request for both Presigned and Signed
+	return checkAuthWithRegion(r, serverConfig.GetRegion())
+}
+
+// checkAuthWithRegion - similar to checkAuth but takes a custom region.
+func checkAuthWithRegion(r *http.Request, region string) APIErrorCode {
+	// Validates the request for both Presigned and Signed.
 	aType := getRequestAuthType(r)
 	if aType != authTypePresigned && aType != authTypeSigned {
 		// For all unhandled auth types return error AccessDenied.
 		return ErrAccessDenied
 	}
-	// Validates the request for both Presigned and Signed.
-	return isReqAuthenticated(r)
+	return isReqAuthenticated(r, region)
 }
 
 // authHandler - handles all the incoming authorization headers and validates them if possible.

cmd/auth-handler_test.go

@@ -294,7 +294,7 @@ func TestIsReqAuthenticated(t *testing.T) {
 		if testCase.s3Error == ErrBadDigest {
 			testCase.req.Header.Set("Content-Md5", "garbage")
 		}
-		if s3Error := isReqAuthenticated(testCase.req); s3Error != testCase.s3Error {
+		if s3Error := isReqAuthenticated(testCase.req, serverConfig.GetRegion()); s3Error != testCase.s3Error {
 			t.Fatalf("Unexpected s3error returned wanted %d, got %d", testCase.s3Error, s3Error)
 		}
 	}

cmd/bucket-handlers-listobjects.go

@@ -82,7 +82,7 @@ func (api objectAPIHandlers) ListObjectsV2Handler(w http.ResponseWriter, r *http
 			return
 		}
 	case authTypeSigned, authTypePresigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -149,7 +149,7 @@ func (api objectAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *http
 			return
 		}
 	case authTypeSigned, authTypePresigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return

cmd/bucket-handlers.go

@@ -94,7 +94,7 @@ func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *
 			return
 		}
 	case authTypeSigned, authTypePresigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, "us-east-1"); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -150,7 +150,7 @@ func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter,
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -197,7 +197,8 @@ func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.R
 	}
 
 	// List buckets does not support bucket policies, no need to enforce it.
-	if s3Error := checkAuth(r); s3Error != ErrNone {
+	// Proceed to validate signature.
+	if s3Error := checkAuthWithRegion(r, ""); s3Error != ErrNone {
 		errorIf(errSignatureMismatch, dumpRequest(r))
 		writeErrorResponse(w, r, s3Error, r.URL.Path)
 		return
@@ -243,7 +244,7 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -357,7 +358,7 @@ func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Req
 	}
 
 	// PutBucket does not support policies, use checkAuth to validate signature.
-	if s3Error := checkAuth(r); s3Error != ErrNone {
+	if s3Error := checkAuthWithRegion(r, "us-east-1"); s3Error != ErrNone {
 		errorIf(errSignatureMismatch, dumpRequest(r))
 		writeErrorResponse(w, r, s3Error, r.URL.Path)
 		return
@@ -490,7 +491,7 @@ func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Re
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return

cmd/bucket-policy-handlers.go

@@ -140,7 +140,7 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
 		return
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -223,7 +223,7 @@ func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r
 		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
 		return
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -269,7 +269,7 @@ func (api objectAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *ht
 		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
 		return
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}

cmd/handler-utils.go

@@ -33,34 +33,28 @@ func isValidLocationConstraint(r *http.Request) (s3Error APIErrorCode) {
 	// If the request has no body with content-length set to 0,
 	// we do not have to validate location constraint. Bucket will
 	// be created at default region.
-	if r.ContentLength == 0 {
-		return ErrNone
-	}
 	locationConstraint := createBucketLocationConfiguration{}
-	if err := xmlDecoder(r.Body, &locationConstraint, r.ContentLength); err != nil {
-		if err == io.EOF && r.ContentLength == -1 {
-			// EOF is a valid condition here when ContentLength is -1.
-			return ErrNone
+	err := xmlDecoder(r.Body, &locationConstraint, r.ContentLength)
+	if err == nil || err == io.EOF {
+		// Successfully decoded, proceed to verify the region.
+		// Once region has been obtained we proceed to verify it.
+		incomingRegion := locationConstraint.Location
+		if incomingRegion == "" {
+			// Location constraint is empty for region "us-east-1",
+			// in accordance with protocol.
+			incomingRegion = "us-east-1"
 		}
-		errorIf(err, "Unable to xml decode location constraint")
-		// Treat all other failures as XML parsing errors.
-		return ErrMalformedXML
-	} // Successfully decoded, proceed to verify the region.
-
-	// Once region has been obtained we proceed to verify it.
-	incomingRegion := locationConstraint.Location
-	if incomingRegion == "" {
-		// Location constraint is empty for region "us-east-1",
-		// in accordance with protocol.
-		incomingRegion = "us-east-1"
-	}
-	// Return errInvalidRegion if location constraint does not match
-	// with configured region.
-	s3Error = ErrNone
-	if serverRegion != incomingRegion {
-		s3Error = ErrInvalidRegion
+		// Return errInvalidRegion if location constraint does not match
+		// with configured region.
+		s3Error = ErrNone
+		if serverRegion != incomingRegion {
+			s3Error = ErrInvalidRegion
+		}
+		return s3Error
 	}
-	return s3Error
+	errorIf(err, "Unable to xml decode location constraint")
+	// Treat all other failures as XML parsing errors.
+	return ErrMalformedXML
 }
 
 // Supported headers that needs to be extracted.

cmd/object-handlers.go

@@ -111,7 +111,7 @@ func (api objectAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Req
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -223,7 +223,7 @@ func (api objectAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.Re
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -280,7 +280,7 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -518,7 +518,7 @@ func (api objectAPIHandlers) NewMultipartUploadHandler(w http.ResponseWriter, r
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -667,7 +667,7 @@ func (api objectAPIHandlers) AbortMultipartUploadHandler(w http.ResponseWriter,
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -707,7 +707,7 @@ func (api objectAPIHandlers) ListObjectPartsHandler(w http.ResponseWriter, r *ht
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -765,7 +765,7 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
@@ -874,7 +874,7 @@ func (api objectAPIHandlers) DeleteObjectHandler(w http.ResponseWriter, r *http.
 			return
 		}
 	case authTypeSigned, authTypePresigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			errorIf(errSignatureMismatch, dumpRequest(r))
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return

cmd/signature-v4.go

@@ -194,13 +194,10 @@ func doesPolicySignatureMatch(formValues map[string]string) APIErrorCode {
 // doesPresignedSignatureMatch - Verify query headers with presigned signature
 //     - http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html
 // returns true if matches, false otherwise. if error is not nil then it is always false
-func doesPresignedSignatureMatch(hashedPayload string, r *http.Request, validateRegion bool) APIErrorCode {
+func doesPresignedSignatureMatch(hashedPayload string, r *http.Request, region string) APIErrorCode {
 	// Access credentials.
 	cred := serverConfig.GetCredential()
 
-	// Server region.
-	region := serverConfig.GetRegion()
-
 	// Copy request
 	req := *r
 
@@ -223,15 +220,13 @@ func doesPresignedSignatureMatch(hashedPayload string, r *http.Request, validate
 
 	// Verify if region is valid.
 	sRegion := pSignValues.Credential.scope.region
-	// Should validate region, only if region is set. Some operations
-	// do not need region validated for example GetBucketLocation.
-	if validateRegion {
-		if !isValidRegion(sRegion, region) {
-			return ErrInvalidRegion
-		}
-	} else {
+	// Should validate region, only if region is set.
+	if region == "" {
 		region = sRegion
 	}
+	if !isValidRegion(sRegion, region) {
+		return ErrInvalidRegion
+	}
 
 	// Extract all the signed headers along with its values.
 	extractedSignedHeaders, errCode := extractSignedHeaders(pSignValues.SignedHeaders, req.Header)
@@ -322,13 +317,10 @@ func doesPresignedSignatureMatch(hashedPayload string, r *http.Request, validate
 // doesSignatureMatch - Verify authorization header with calculated header in accordance with
 //     - http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
 // returns true if matches, false otherwise. if error is not nil then it is always false
-func doesSignatureMatch(hashedPayload string, r *http.Request, validateRegion bool) APIErrorCode {
+func doesSignatureMatch(hashedPayload string, r *http.Request, region string) APIErrorCode {
 	// Access credentials.
 	cred := serverConfig.GetCredential()
 
-	// Server region.
-	region := serverConfig.GetRegion()
-
 	// Copy request.
 	req := *r
 
@@ -372,14 +364,17 @@ func doesSignatureMatch(hashedPayload string, r *http.Request, validateRegion bo
 
 	// Verify if region is valid.
 	sRegion := signV4Values.Credential.scope.region
-	// Should validate region, only if region is set. Some operations
-	// do not need region validated for example GetBucketLocation.
-	if validateRegion {
-		if !isValidRegion(sRegion, region) {
-			return ErrInvalidRegion
-		}
+	// Region is set to be empty, we use whatever was sent by the
+	// request and proceed further. This is a work-around to address
+	// an important problem for ListBuckets() getting signed with
+	// different regions.
+	if region == "" {
+		region = sRegion
+	}
+	// Should validate region, only if region is set.
+	if !isValidRegion(sRegion, region) {
+		return ErrInvalidRegion
 	}
-	region = sRegion
 
 	// Extract date, if not present throw error.
 	var date string

cmd/signature-v4_test.go

@@ -106,15 +106,15 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 	credentialTemplate := "%s/%s/%s/s3/aws4_request"
 
 	testCases := []struct {
-		queryParams  map[string]string
-		headers      map[string]string
-		verifyRegion bool
-		expected     APIErrorCode
+		queryParams map[string]string
+		headers     map[string]string
+		region      string
+		expected    APIErrorCode
 	}{
 		// (0) Should error without a set URL query.
 		{
-			verifyRegion: false,
-			expected:     ErrInvalidQueryParams,
+			region:   "us-east-1",
+			expected: ErrInvalidQueryParams,
 		},
 		// (1) Should error on an invalid access key.
 		{
@@ -126,8 +126,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-SignedHeaders": "host;x-amz-content-sha256;x-amz-date",
 				"X-Amz-Credential":    fmt.Sprintf(credentialTemplate, "Z7IXGOO6BZ0REAN1Q26I", now.Format(yyyymmdd), "us-west-1"),
 			},
-			verifyRegion: false,
-			expected:     ErrInvalidAccessKeyID,
+			region:   "us-west-1",
+			expected: ErrInvalidAccessKeyID,
 		},
 		// (2) Should error when the payload sha256 doesn't match.
 		{
@@ -140,8 +140,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-Credential":     fmt.Sprintf(credentialTemplate, serverConfig.GetCredential().AccessKeyID, now.Format(yyyymmdd), "us-west-1"),
 				"X-Amz-Content-Sha256": "ThisIsNotThePayloadHash",
 			},
-			verifyRegion: false,
-			expected:     ErrContentSHA256Mismatch,
+			region:   "us-west-1",
+			expected: ErrContentSHA256Mismatch,
 		},
 		// (3) Should fail with an invalid region.
 		{
@@ -154,8 +154,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-Credential":     fmt.Sprintf(credentialTemplate, serverConfig.GetCredential().AccessKeyID, now.Format(yyyymmdd), "us-west-1"),
 				"X-Amz-Content-Sha256": payload,
 			},
-			verifyRegion: true,
-			expected:     ErrInvalidRegion,
+			region:   "us-east-1",
+			expected: ErrInvalidRegion,
 		},
 		// (4) Should NOT fail with an invalid region if it doesn't verify it.
 		{
@@ -168,8 +168,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-Credential":     fmt.Sprintf(credentialTemplate, serverConfig.GetCredential().AccessKeyID, now.Format(yyyymmdd), "us-west-1"),
 				"X-Amz-Content-Sha256": payload,
 			},
-			verifyRegion: false,
-			expected:     ErrUnsignedHeaders,
+			region:   "us-west-1",
+			expected: ErrUnsignedHeaders,
 		},
 		// (5) Should fail to extract headers if the host header is not signed.
 		{
@@ -182,8 +182,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-Credential":     fmt.Sprintf(credentialTemplate, serverConfig.GetCredential().AccessKeyID, now.Format(yyyymmdd), serverConfig.GetRegion()),
 				"X-Amz-Content-Sha256": payload,
 			},
-			verifyRegion: true,
-			expected:     ErrUnsignedHeaders,
+			region:   serverConfig.GetRegion(),
+			expected: ErrUnsignedHeaders,
 		},
 		// (6) Should give an expired request if it has expired.
 		{
@@ -200,8 +200,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-Date":           now.AddDate(0, 0, -2).Format(iso8601Format),
 				"X-Amz-Content-Sha256": payload,
 			},
-			verifyRegion: false,
-			expected:     ErrExpiredPresignRequest,
+			region:   serverConfig.GetRegion(),
+			expected: ErrExpiredPresignRequest,
 		},
 		// (7) Should error if the signature is incorrect.
 		{
@@ -218,8 +218,8 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 				"X-Amz-Date":           now.Format(iso8601Format),
 				"X-Amz-Content-Sha256": payload,
 			},
-			verifyRegion: false,
-			expected:     ErrSignatureDoesNotMatch,
+			region:   serverConfig.GetRegion(),
+			expected: ErrSignatureDoesNotMatch,
 		},
 	}
 
@@ -243,7 +243,7 @@ func TestDoesPresignedSignatureMatch(t *testing.T) {
 		}
 
 		// Check if it matches!
-		err := doesPresignedSignatureMatch(payload, req, testCase.verifyRegion)
+		err := doesPresignedSignatureMatch(payload, req, testCase.region)
 		if err != testCase.expected {
 			t.Errorf("(%d) expected to get %s, instead got %s", i, niceError(testCase.expected), niceError(err))
 		}

cmd/signature-verify-reader.go

@@ -19,10 +19,11 @@ package cmd
 import (
 	"encoding/hex"
 	"fmt"
-	"github.com/minio/sha256-simd"
 	"hash"
 	"io"
 	"net/http"
+
+	"github.com/minio/sha256-simd"
 )
 
 // signVerifyReader represents an io.Reader compatible interface which
@@ -49,7 +50,7 @@ func isSignVerify(reader io.Reader) bool {
 
 // Verify - verifies signature and returns error upon signature mismatch.
 func (v *signVerifyReader) Verify() error {
-	validateRegion := true // Defaults to validating region.
+	region := serverConfig.GetRegion()
 	shaPayloadHex := hex.EncodeToString(v.HashWriter.Sum(nil))
 	if skipContentSha256Cksum(v.Request) {
 		// Sets 'UNSIGNED-PAYLOAD' if client requested to not calculated sha256.
@@ -58,9 +59,9 @@ func (v *signVerifyReader) Verify() error {
 	// Signature verification block.
 	var s3Error APIErrorCode
 	if isRequestSignatureV4(v.Request) {
-		s3Error = doesSignatureMatch(shaPayloadHex, v.Request, validateRegion)
+		s3Error = doesSignatureMatch(shaPayloadHex, v.Request, region)
 	} else if isRequestPresignedSignatureV4(v.Request) {
-		s3Error = doesPresignedSignatureMatch(shaPayloadHex, v.Request, validateRegion)
+		s3Error = doesPresignedSignatureMatch(shaPayloadHex, v.Request, region)
 	} else {
 		// Couldn't figure out the request type, set the error as AccessDenied.
 		s3Error = ErrAccessDenied