mirror of
https://github.com/minio/minio
synced 2024-09-06 00:37:25 +00:00
![Krishnan Parthasarathi](/assets/img/avatar_default.png)
This change implements bucket policy enhancements required to restrict access based on HTTP referer. See https://docs.aws.amazon.com/AmazonS3/latest/dev/example-bucket-policies.html#example-bucket-policies-use-case-4 for more information. Fixes #3540
237 lines
7 KiB
Go
237 lines
7 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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"io/ioutil"
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"net/http"
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"strings"
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)
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// Verify if the request http Header "x-amz-content-sha256" == "UNSIGNED-PAYLOAD"
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func isRequestUnsignedPayload(r *http.Request) bool {
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return r.Header.Get("x-amz-content-sha256") == unsignedPayload
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}
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// Verify if request has JWT.
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func isRequestJWT(r *http.Request) bool {
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return strings.HasPrefix(r.Header.Get("Authorization"), jwtAlgorithm)
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}
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// Verify if request has AWS Signature Version '4'.
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func isRequestSignatureV4(r *http.Request) bool {
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return strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm)
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}
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// Verify if request has AWS Signature Version '2'.
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func isRequestSignatureV2(r *http.Request) bool {
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return (!strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm) &&
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strings.HasPrefix(r.Header.Get("Authorization"), signV2Algorithm))
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}
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// Verify if request has AWS PreSign Version '4'.
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func isRequestPresignedSignatureV4(r *http.Request) bool {
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_, ok := r.URL.Query()["X-Amz-Credential"]
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return ok
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}
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// Verify request has AWS PreSign Version '2'.
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func isRequestPresignedSignatureV2(r *http.Request) bool {
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_, ok := r.URL.Query()["AWSAccessKeyId"]
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return ok
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}
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// Verify if request has AWS Post policy Signature Version '4'.
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func isRequestPostPolicySignatureV4(r *http.Request) bool {
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return strings.Contains(r.Header.Get("Content-Type"), "multipart/form-data") && r.Method == httpPOST
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}
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// Verify if the request has AWS Streaming Signature Version '4'. This is only valid for 'PUT' operation.
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func isRequestSignStreamingV4(r *http.Request) bool {
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return r.Header.Get("x-amz-content-sha256") == streamingContentSHA256 && r.Method == httpPUT
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}
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// Authorization type.
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type authType int
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// List of all supported auth types.
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const (
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authTypeUnknown authType = iota
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authTypeAnonymous
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authTypePresigned
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authTypePresignedV2
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authTypePostPolicy
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authTypeStreamingSigned
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authTypeSigned
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authTypeSignedV2
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authTypeJWT
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)
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// Get request authentication type.
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func getRequestAuthType(r *http.Request) authType {
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if isRequestSignatureV2(r) {
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return authTypeSignedV2
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} else if isRequestPresignedSignatureV2(r) {
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return authTypePresignedV2
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} else if isRequestSignStreamingV4(r) {
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return authTypeStreamingSigned
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} else if isRequestSignatureV4(r) {
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return authTypeSigned
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} else if isRequestPresignedSignatureV4(r) {
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return authTypePresigned
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} else if isRequestJWT(r) {
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return authTypeJWT
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} else if isRequestPostPolicySignatureV4(r) {
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return authTypePostPolicy
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} else if _, ok := r.Header["Authorization"]; !ok {
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return authTypeAnonymous
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}
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return authTypeUnknown
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}
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func checkRequestAuthType(r *http.Request, bucket, policyAction, region string) APIErrorCode {
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reqAuthType := getRequestAuthType(r)
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switch reqAuthType {
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case authTypePresignedV2, authTypeSignedV2:
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// Signature V2 validation.
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s3Error := isReqAuthenticatedV2(r)
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if s3Error != ErrNone {
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errorIf(errSignatureMismatch, dumpRequest(r))
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}
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return s3Error
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case authTypeSigned, authTypePresigned:
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s3Error := isReqAuthenticated(r, region)
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if s3Error != ErrNone {
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errorIf(errSignatureMismatch, dumpRequest(r))
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}
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return s3Error
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}
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if reqAuthType == authTypeAnonymous && policyAction != "" {
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
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return enforceBucketPolicy(bucket, policyAction, r.URL.Path,
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r.Referer(), r.URL.Query())
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}
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// By default return ErrAccessDenied
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return ErrAccessDenied
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}
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// Verify if request has valid AWS Signature Version '2'.
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func isReqAuthenticatedV2(r *http.Request) (s3Error APIErrorCode) {
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if isRequestSignatureV2(r) {
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return doesSignV2Match(r)
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}
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return doesPresignV2SignatureMatch(r)
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}
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func reqSignatureV4Verify(r *http.Request) (s3Error APIErrorCode) {
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sha256sum := r.Header.Get("X-Amz-Content-Sha256")
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// Skips calculating sha256 on the payload on server,
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// if client requested for it.
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if skipContentSha256Cksum(r) {
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sha256sum = unsignedPayload
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}
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if isRequestSignatureV4(r) {
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return doesSignatureMatch(sha256sum, r, serverConfig.GetRegion())
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} else if isRequestPresignedSignatureV4(r) {
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return doesPresignedSignatureMatch(sha256sum, r, serverConfig.GetRegion())
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}
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return ErrAccessDenied
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}
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// Verify if request has valid AWS Signature Version '4'.
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func isReqAuthenticated(r *http.Request, region string) (s3Error APIErrorCode) {
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if r == nil {
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return ErrInternalError
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}
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payload, err := ioutil.ReadAll(r.Body)
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if err != nil {
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errorIf(err, "Unable to read request body for signature verification")
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return ErrInternalError
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}
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// Verify Content-Md5, if payload is set.
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if r.Header.Get("Content-Md5") != "" {
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if r.Header.Get("Content-Md5") != getMD5HashBase64(payload) {
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return ErrBadDigest
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}
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}
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// Populate back the payload.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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// Skips calculating sha256 on the payload on server, if client requested for it.
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var sha256sum string
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if skipContentSha256Cksum(r) {
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sha256sum = unsignedPayload
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} else {
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sha256sum = getSHA256Hash(payload)
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}
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if isRequestSignatureV4(r) {
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return doesSignatureMatch(sha256sum, r, region)
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} else if isRequestPresignedSignatureV4(r) {
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return doesPresignedSignatureMatch(sha256sum, r, region)
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}
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return ErrAccessDenied
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}
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// authHandler - handles all the incoming authorization headers and validates them if possible.
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type authHandler struct {
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handler http.Handler
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}
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// setAuthHandler to validate authorization header for the incoming request.
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func setAuthHandler(h http.Handler) http.Handler {
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return authHandler{h}
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}
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// List of all support S3 auth types.
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var supportedS3AuthTypes = map[authType]struct{}{
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authTypeAnonymous: {},
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authTypePresigned: {},
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authTypePresignedV2: {},
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authTypeSigned: {},
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authTypeSignedV2: {},
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authTypePostPolicy: {},
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authTypeStreamingSigned: {},
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}
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// Validate if the authType is valid and supported.
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func isSupportedS3AuthType(aType authType) bool {
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_, ok := supportedS3AuthTypes[aType]
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return ok
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}
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// handler for validating incoming authorization headers.
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func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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aType := getRequestAuthType(r)
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if isSupportedS3AuthType(aType) {
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// Let top level caller validate for anonymous and known signed requests.
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a.handler.ServeHTTP(w, r)
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return
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} else if aType == authTypeJWT {
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// Validate Authorization header if its valid for JWT request.
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if !isHTTPRequestValid(r) {
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w.WriteHeader(http.StatusUnauthorized)
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return
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}
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a.handler.ServeHTTP(w, r)
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return
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}
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writeErrorResponse(w, ErrSignatureVersionNotSupported, r.URL)
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}
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