mirror of
https://github.com/minio/minio.git
synced 2024-12-26 07:05:55 -05:00
300 lines
9.1 KiB
Go
300 lines
9.1 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015-2018 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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"context"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/hash"
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"github.com/minio/minio/pkg/policy"
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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") &&
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r.Method == http.MethodPost
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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 &&
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r.Method == http.MethodPut
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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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// checkAdminRequestAuthType checks whether the request is a valid signature V2 or V4 request.
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// It does not accept presigned or JWT or anonymous requests.
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func checkAdminRequestAuthType(r *http.Request, region string) APIErrorCode {
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s3Err := ErrAccessDenied
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if _, ok := r.Header["X-Amz-Content-Sha256"]; ok && getRequestAuthType(r) == authTypeSigned && !skipContentSha256Cksum(r) { // we only support V4 (no presign) with auth. body
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s3Err = isReqAuthenticated(r, region)
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}
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if s3Err != ErrNone {
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reqInfo := (&logger.ReqInfo{}).AppendTags("requestHeaders", dumpRequest(r))
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ctx := logger.SetReqInfo(context.Background(), reqInfo)
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logger.LogIf(ctx, errors.New(getAPIError(s3Err).Description))
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}
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return s3Err
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}
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func checkRequestAuthType(ctx context.Context, r *http.Request, action policy.Action, bucketName, objectName string) APIErrorCode {
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isOwner := true
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accountName := globalServerConfig.GetCredential().AccessKey
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switch getRequestAuthType(r) {
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case authTypeUnknown:
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return ErrAccessDenied
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case authTypePresignedV2, authTypeSignedV2:
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if errorCode := isReqAuthenticatedV2(r); errorCode != ErrNone {
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return errorCode
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}
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case authTypeSigned, authTypePresigned:
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region := globalServerConfig.GetRegion()
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switch action {
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case policy.GetBucketLocationAction, policy.ListAllMyBucketsAction:
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region = ""
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}
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if errorCode := isReqAuthenticated(r, region); errorCode != ErrNone {
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return errorCode
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}
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default:
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isOwner = false
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accountName = ""
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}
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// LocationConstraint is valid only for CreateBucketAction.
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var locationConstraint string
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if action == policy.CreateBucketAction {
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// To extract region from XML in request body, get copy of request body.
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payload, err := ioutil.ReadAll(io.LimitReader(r.Body, maxLocationConstraintSize))
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if err != nil {
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logger.LogIf(ctx, err)
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return ErrMalformedXML
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}
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// Populate payload to extract location constraint.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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var s3Error APIErrorCode
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locationConstraint, s3Error = parseLocationConstraint(r)
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if s3Error != ErrNone {
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return s3Error
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}
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// Populate payload again to handle it in HTTP handler.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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}
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if globalPolicySys.IsAllowed(policy.Args{
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AccountName: accountName,
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Action: action,
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, locationConstraint),
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IsOwner: isOwner,
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ObjectName: objectName,
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}) {
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return ErrNone
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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 '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, region string) (s3Error APIErrorCode) {
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sha256sum := getContentSha256Cksum(r)
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switch {
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case isRequestSignatureV4(r):
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return doesSignatureMatch(sha256sum, r, region)
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case isRequestPresignedSignatureV4(r):
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return doesPresignedSignatureMatch(sha256sum, r, region)
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default:
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return ErrAccessDenied
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}
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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 errCode := reqSignatureV4Verify(r, region); errCode != ErrNone {
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return errCode
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}
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var (
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err error
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contentMD5, contentSHA256 []byte
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)
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// Extract 'Content-Md5' if present.
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if _, ok := r.Header["Content-Md5"]; ok {
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contentMD5, err = base64.StdEncoding.Strict().DecodeString(r.Header.Get("Content-Md5"))
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if err != nil || len(contentMD5) == 0 {
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return ErrInvalidDigest
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}
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}
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// Extract either 'X-Amz-Content-Sha256' header or 'X-Amz-Content-Sha256' query parameter (if V4 presigned)
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// Do not verify 'X-Amz-Content-Sha256' if skipSHA256.
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if skipSHA256 := skipContentSha256Cksum(r); !skipSHA256 && isRequestPresignedSignatureV4(r) {
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if sha256Sum, ok := r.URL.Query()["X-Amz-Content-Sha256"]; ok && len(sha256Sum) > 0 {
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contentSHA256, err = hex.DecodeString(sha256Sum[0])
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if err != nil {
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return ErrContentSHA256Mismatch
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}
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}
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} else if _, ok := r.Header["X-Amz-Content-Sha256"]; !skipSHA256 && ok {
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contentSHA256, err = hex.DecodeString(r.Header.Get("X-Amz-Content-Sha256"))
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if err != nil || len(contentSHA256) == 0 {
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return ErrContentSHA256Mismatch
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}
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}
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// Verify 'Content-Md5' and/or 'X-Amz-Content-Sha256' if present.
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// The verification happens implicit during reading.
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reader, err := hash.NewReader(r.Body, -1, hex.EncodeToString(contentMD5), hex.EncodeToString(contentSHA256), -1)
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if err != nil {
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return toAPIErrorCode(err)
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}
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r.Body = ioutil.NopCloser(reader)
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return ErrNone
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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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