This is to ensure proper compatibility with AWS S3, handle special cases where - Content-Md5 is set to empty - Content-Md5 is set to invalid
269 lines
7.7 KiB
Go
269 lines
7.7 KiB
Go
/*
|
|
* 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 cmd
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/base64"
|
|
"encoding/hex"
|
|
"errors"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/minio/minio/pkg/handlers"
|
|
)
|
|
|
|
// Verify if request has JWT.
|
|
func isRequestJWT(r *http.Request) bool {
|
|
return strings.HasPrefix(r.Header.Get("Authorization"), jwtAlgorithm)
|
|
}
|
|
|
|
// Verify if request has AWS Signature Version '4'.
|
|
func isRequestSignatureV4(r *http.Request) bool {
|
|
return strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm)
|
|
}
|
|
|
|
// Verify if request has AWS Signature Version '2'.
|
|
func isRequestSignatureV2(r *http.Request) bool {
|
|
return (!strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm) &&
|
|
strings.HasPrefix(r.Header.Get("Authorization"), signV2Algorithm))
|
|
}
|
|
|
|
// Verify if request has AWS PreSign Version '4'.
|
|
func isRequestPresignedSignatureV4(r *http.Request) bool {
|
|
_, ok := r.URL.Query()["X-Amz-Credential"]
|
|
return ok
|
|
}
|
|
|
|
// Verify request has AWS PreSign Version '2'.
|
|
func isRequestPresignedSignatureV2(r *http.Request) bool {
|
|
_, ok := r.URL.Query()["AWSAccessKeyId"]
|
|
return ok
|
|
}
|
|
|
|
// Verify if request has AWS Post policy Signature Version '4'.
|
|
func isRequestPostPolicySignatureV4(r *http.Request) bool {
|
|
return strings.Contains(r.Header.Get("Content-Type"), "multipart/form-data") &&
|
|
r.Method == http.MethodPost
|
|
}
|
|
|
|
// Verify if the request has AWS Streaming Signature Version '4'. This is only valid for 'PUT' operation.
|
|
func isRequestSignStreamingV4(r *http.Request) bool {
|
|
return r.Header.Get("x-amz-content-sha256") == streamingContentSHA256 &&
|
|
r.Method == http.MethodPut
|
|
}
|
|
|
|
// Authorization type.
|
|
type authType int
|
|
|
|
// List of all supported auth types.
|
|
const (
|
|
authTypeUnknown authType = iota
|
|
authTypeAnonymous
|
|
authTypePresigned
|
|
authTypePresignedV2
|
|
authTypePostPolicy
|
|
authTypeStreamingSigned
|
|
authTypeSigned
|
|
authTypeSignedV2
|
|
authTypeJWT
|
|
)
|
|
|
|
// Get request authentication type.
|
|
func getRequestAuthType(r *http.Request) authType {
|
|
if isRequestSignatureV2(r) {
|
|
return authTypeSignedV2
|
|
} else if isRequestPresignedSignatureV2(r) {
|
|
return authTypePresignedV2
|
|
} else if isRequestSignStreamingV4(r) {
|
|
return authTypeStreamingSigned
|
|
} else if isRequestSignatureV4(r) {
|
|
return authTypeSigned
|
|
} else if isRequestPresignedSignatureV4(r) {
|
|
return authTypePresigned
|
|
} else if isRequestJWT(r) {
|
|
return authTypeJWT
|
|
} else if isRequestPostPolicySignatureV4(r) {
|
|
return authTypePostPolicy
|
|
} else if _, ok := r.Header["Authorization"]; !ok {
|
|
return authTypeAnonymous
|
|
}
|
|
return authTypeUnknown
|
|
}
|
|
|
|
// checkAdminRequestAuthType checks whether the request is a valid signature V2 or V4 request.
|
|
// It does not accept presigned or JWT or anonymous requests.
|
|
func checkAdminRequestAuthType(r *http.Request, region string) APIErrorCode {
|
|
s3Err := ErrAccessDenied
|
|
if getRequestAuthType(r) == authTypeSigned { // we only support V4 (no presign)
|
|
s3Err = isReqAuthenticated(r, region)
|
|
}
|
|
if s3Err != ErrNone {
|
|
errorIf(errors.New(getAPIError(s3Err).Description), "%s", dumpRequest(r))
|
|
}
|
|
return s3Err
|
|
}
|
|
|
|
func checkRequestAuthType(r *http.Request, bucket, policyAction, region string) APIErrorCode {
|
|
reqAuthType := getRequestAuthType(r)
|
|
|
|
switch reqAuthType {
|
|
case authTypePresignedV2, authTypeSignedV2:
|
|
// Signature V2 validation.
|
|
return isReqAuthenticatedV2(r)
|
|
case authTypeSigned, authTypePresigned:
|
|
return isReqAuthenticated(r, region)
|
|
}
|
|
|
|
if reqAuthType == authTypeAnonymous && policyAction != "" {
|
|
// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
|
|
resource, err := getResource(r.URL.Path, r.Host, globalDomainName)
|
|
if err != nil {
|
|
return ErrInternalError
|
|
}
|
|
return enforceBucketPolicy(bucket, policyAction, resource,
|
|
r.Referer(), handlers.GetSourceIP(r), r.URL.Query())
|
|
}
|
|
|
|
// By default return ErrAccessDenied
|
|
return ErrAccessDenied
|
|
}
|
|
|
|
// Verify if request has valid AWS Signature Version '2'.
|
|
func isReqAuthenticatedV2(r *http.Request) (s3Error APIErrorCode) {
|
|
if isRequestSignatureV2(r) {
|
|
return doesSignV2Match(r)
|
|
}
|
|
return doesPresignV2SignatureMatch(r)
|
|
}
|
|
|
|
func reqSignatureV4Verify(r *http.Request, region string) (s3Error APIErrorCode) {
|
|
sha256sum := getContentSha256Cksum(r)
|
|
switch {
|
|
case isRequestSignatureV4(r):
|
|
return doesSignatureMatch(sha256sum, r, region)
|
|
case isRequestPresignedSignatureV4(r):
|
|
return doesPresignedSignatureMatch(sha256sum, r, region)
|
|
default:
|
|
return ErrAccessDenied
|
|
}
|
|
}
|
|
|
|
// Verify if request has valid AWS Signature Version '4'.
|
|
func isReqAuthenticated(r *http.Request, region string) (s3Error APIErrorCode) {
|
|
if r == nil {
|
|
return ErrInternalError
|
|
}
|
|
|
|
if errCode := reqSignatureV4Verify(r, region); errCode != ErrNone {
|
|
return errCode
|
|
}
|
|
|
|
payload, err := ioutil.ReadAll(r.Body)
|
|
if err != nil {
|
|
errorIf(err, "Unable to read request body for signature verification")
|
|
return ErrInternalError
|
|
}
|
|
|
|
// Populate back the payload.
|
|
r.Body = ioutil.NopCloser(bytes.NewReader(payload))
|
|
|
|
// Verify Content-Md5, if payload is set.
|
|
if clntMD5B64, ok := r.Header["Content-Md5"]; ok {
|
|
if clntMD5B64[0] == "" {
|
|
return ErrInvalidDigest
|
|
}
|
|
md5Sum, err := base64.StdEncoding.Strict().DecodeString(clntMD5B64[0])
|
|
if err != nil {
|
|
return ErrInvalidDigest
|
|
}
|
|
if !bytes.Equal(md5Sum, getMD5Sum(payload)) {
|
|
return ErrBadDigest
|
|
}
|
|
}
|
|
|
|
if skipContentSha256Cksum(r) {
|
|
return ErrNone
|
|
}
|
|
|
|
// Verify that X-Amz-Content-Sha256 Header == sha256(payload)
|
|
// If X-Amz-Content-Sha256 header is not sent then we don't calculate/verify sha256(payload)
|
|
sumHex, ok := r.Header["X-Amz-Content-Sha256"]
|
|
if isRequestPresignedSignatureV4(r) {
|
|
sumHex, ok = r.URL.Query()["X-Amz-Content-Sha256"]
|
|
}
|
|
if ok {
|
|
if sumHex[0] == "" {
|
|
return ErrContentSHA256Mismatch
|
|
}
|
|
sum, err := hex.DecodeString(sumHex[0])
|
|
if err != nil {
|
|
return ErrContentSHA256Mismatch
|
|
}
|
|
if !bytes.Equal(sum, getSHA256Sum(payload)) {
|
|
return ErrContentSHA256Mismatch
|
|
}
|
|
}
|
|
return ErrNone
|
|
}
|
|
|
|
// authHandler - handles all the incoming authorization headers and validates them if possible.
|
|
type authHandler struct {
|
|
handler http.Handler
|
|
}
|
|
|
|
// setAuthHandler to validate authorization header for the incoming request.
|
|
func setAuthHandler(h http.Handler) http.Handler {
|
|
return authHandler{h}
|
|
}
|
|
|
|
// List of all support S3 auth types.
|
|
var supportedS3AuthTypes = map[authType]struct{}{
|
|
authTypeAnonymous: {},
|
|
authTypePresigned: {},
|
|
authTypePresignedV2: {},
|
|
authTypeSigned: {},
|
|
authTypeSignedV2: {},
|
|
authTypePostPolicy: {},
|
|
authTypeStreamingSigned: {},
|
|
}
|
|
|
|
// Validate if the authType is valid and supported.
|
|
func isSupportedS3AuthType(aType authType) bool {
|
|
_, ok := supportedS3AuthTypes[aType]
|
|
return ok
|
|
}
|
|
|
|
// handler for validating incoming authorization headers.
|
|
func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
aType := getRequestAuthType(r)
|
|
if isSupportedS3AuthType(aType) {
|
|
// Let top level caller validate for anonymous and known signed requests.
|
|
a.handler.ServeHTTP(w, r)
|
|
return
|
|
} else if aType == authTypeJWT {
|
|
// Validate Authorization header if its valid for JWT request.
|
|
if !isHTTPRequestValid(r) {
|
|
w.WriteHeader(http.StatusUnauthorized)
|
|
return
|
|
}
|
|
a.handler.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
writeErrorResponse(w, ErrSignatureVersionNotSupported, r.URL)
|
|
}
|