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472 lines
14 KiB
472 lines
14 KiB
/*
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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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"crypto/subtle"
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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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jwtgo "github.com/dgrijalva/jwt-go"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/auth"
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"github.com/minio/minio/pkg/hash"
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"github.com/minio/minio/pkg/iam/policy"
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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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authTypeSTS
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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.URL.Query()["Action"]; ok {
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return authTypeSTS
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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(ctx context.Context, 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 &&
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getRequestAuthType(r) == authTypeSigned && !skipContentSha256Cksum(r) {
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// We only support admin credentials to access admin APIs.
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var owner bool
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_, owner, s3Err = getReqAccessKeyV4(r, region)
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if s3Err != ErrNone {
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return s3Err
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}
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if !owner {
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return ErrAccessDenied
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}
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// we only support V4 (no presign) with auth body
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s3Err = isReqAuthenticated(ctx, 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(ctx, 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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// Fetch the security token set by the client.
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func getSessionToken(r *http.Request) (token string) {
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token = r.Header.Get("X-Amz-Security-Token")
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if token != "" {
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return token
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}
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return r.URL.Query().Get("X-Amz-Security-Token")
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}
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// Fetch claims in the security token returned by the client, doesn't return
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// errors - upon errors the returned claims map will be empty.
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func mustGetClaimsFromToken(r *http.Request) map[string]interface{} {
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claims, _ := getClaimsFromToken(r)
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return claims
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}
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// Fetch claims in the security token returned by the client.
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func getClaimsFromToken(r *http.Request) (map[string]interface{}, error) {
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claims := make(map[string]interface{})
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token := getSessionToken(r)
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if token == "" {
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return claims, nil
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}
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stsTokenCallback := func(jwtToken *jwtgo.Token) (interface{}, error) {
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// JWT token for x-amz-security-token is signed with admin
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// secret key, temporary credentials become invalid if
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// server admin credentials change. This is done to ensure
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// that clients cannot decode the token using the temp
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// secret keys and generate an entirely new claim by essentially
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// hijacking the policies. We need to make sure that this is
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// based an admin credential such that token cannot be decoded
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// on the client side and is treated like an opaque value.
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return []byte(globalServerConfig.GetCredential().SecretKey), nil
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}
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p := &jwtgo.Parser{
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ValidMethods: []string{
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jwtgo.SigningMethodHS256.Alg(),
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jwtgo.SigningMethodHS512.Alg(),
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},
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}
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jtoken, err := p.ParseWithClaims(token, jwtgo.MapClaims(claims), stsTokenCallback)
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if err != nil {
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return nil, err
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}
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if !jtoken.Valid {
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return nil, errAuthentication
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}
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v, ok := claims["accessKey"]
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if !ok {
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return nil, errInvalidAccessKeyID
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}
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if _, ok = v.(string); !ok {
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return nil, errInvalidAccessKeyID
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}
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return claims, nil
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}
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// Fetch claims in the security token returned by the client and validate the token.
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func checkClaimsFromToken(r *http.Request, cred auth.Credentials) (map[string]interface{}, APIErrorCode) {
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token := getSessionToken(r)
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if token != "" && cred.AccessKey == "" {
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return nil, ErrNoAccessKey
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}
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if subtle.ConstantTimeCompare([]byte(token), []byte(cred.SessionToken)) != 1 {
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return nil, ErrInvalidToken
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}
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claims, err := getClaimsFromToken(r)
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if err != nil {
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return nil, toAPIErrorCode(context.Background(), err)
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}
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return claims, ErrNone
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}
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// Check request auth type verifies the incoming http request
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// - validates the request signature
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// - validates the policy action if anonymous tests bucket policies if any,
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// for authenticated requests validates IAM policies.
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// returns APIErrorCode if any to be replied to the client.
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func checkRequestAuthType(ctx context.Context, r *http.Request, action policy.Action, bucketName, objectName string) (s3Err APIErrorCode) {
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var cred auth.Credentials
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var owner bool
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switch getRequestAuthType(r) {
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case authTypeUnknown, authTypeStreamingSigned:
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return ErrAccessDenied
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case authTypePresignedV2, authTypeSignedV2:
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if s3Err = isReqAuthenticatedV2(r); s3Err != ErrNone {
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return s3Err
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}
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cred, owner, s3Err = getReqAccessKeyV2(r)
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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 s3Err = isReqAuthenticated(ctx, r, region); s3Err != ErrNone {
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return s3Err
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}
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cred, owner, s3Err = getReqAccessKeyV4(r, region)
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}
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if s3Err != ErrNone {
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return s3Err
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}
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claims, s3Err := checkClaimsFromToken(r, cred)
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if s3Err != ErrNone {
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return s3Err
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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 cred.AccessKey == "" {
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if globalPolicySys.IsAllowed(policy.Args{
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AccountName: cred.AccessKey,
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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: false,
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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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if globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: cred.AccessKey,
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Action: iampolicy.Action(action),
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, "", cred.AccessKey),
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ObjectName: objectName,
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IsOwner: owner,
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Claims: claims,
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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(ctx context.Context, 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(ctx, 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 _, _, authErr := webRequestAuthenticate(r); authErr != nil {
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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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} else if aType == authTypeSTS {
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a.handler.ServeHTTP(w, r)
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return
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}
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writeErrorResponse(w, errorCodes.ToAPIErr(ErrSignatureVersionNotSupported), r.URL, guessIsBrowserReq(r))
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}
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// isPutAllowed - check if PUT operation is allowed on the resource, this
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// call verifies bucket policies and IAM policies, supports multi user
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// checks etc.
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func isPutAllowed(atype authType, bucketName, objectName string, r *http.Request) (s3Err APIErrorCode) {
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var cred auth.Credentials
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var owner bool
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switch atype {
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case authTypeUnknown:
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return ErrAccessDenied
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case authTypeSignedV2, authTypePresignedV2:
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cred, owner, s3Err = getReqAccessKeyV2(r)
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case authTypeStreamingSigned, authTypePresigned, authTypeSigned:
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region := globalServerConfig.GetRegion()
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cred, owner, s3Err = getReqAccessKeyV4(r, region)
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}
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if s3Err != ErrNone {
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return s3Err
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}
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claims, s3Err := checkClaimsFromToken(r, cred)
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if s3Err != ErrNone {
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return s3Err
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}
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if cred.AccessKey == "" {
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if globalPolicySys.IsAllowed(policy.Args{
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AccountName: cred.AccessKey,
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Action: policy.PutObjectAction,
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, "", ""),
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IsOwner: false,
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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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if globalIAMSys.IsAllowed(iampolicy.Args{
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AccountName: cred.AccessKey,
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Action: policy.PutObjectAction,
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BucketName: bucketName,
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ConditionValues: getConditionValues(r, "", cred.AccessKey),
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ObjectName: objectName,
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IsOwner: owner,
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Claims: claims,
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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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