minio/cmd/bucket-policy-handlers.go
Harshavardhana dba61867e8 Redirect browser requests returning AccessDenied (#6848)
Anonymous requests from S3 resources returning
AccessDenied should be auto redirected to browser
for login.
2018-11-26 12:15:12 -08:00

182 lines
5.3 KiB
Go

/*
* Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 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 (
"encoding/json"
"io"
"net/http"
humanize "github.com/dustin/go-humanize"
"github.com/gorilla/mux"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/policy"
)
const (
// As per AWS S3 specification, 20KiB policy JSON data is allowed.
maxBucketPolicySize = 20 * humanize.KiByte
// Policy configuration file.
bucketPolicyConfig = "policy.json"
)
// PutBucketPolicyHandler - This HTTP handler stores given bucket policy configuration as per
// https://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "PutBucketPolicy")
defer logger.AuditLog(w, r, "PutBucketPolicy", mustGetClaimsFromToken(r))
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL, guessIsBrowserReq(r))
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
if s3Error := checkRequestAuthType(ctx, r, policy.PutBucketPolicyAction, bucket, ""); s3Error != ErrNone {
writeErrorResponse(w, s3Error, r.URL, guessIsBrowserReq(r))
return
}
// Check if bucket exists.
if _, err := objAPI.GetBucketInfo(ctx, bucket); err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
// Error out if Content-Length is missing.
// PutBucketPolicy always needs Content-Length.
if r.ContentLength <= 0 {
writeErrorResponse(w, ErrMissingContentLength, r.URL, guessIsBrowserReq(r))
return
}
// Error out if Content-Length is beyond allowed size.
if r.ContentLength > maxBucketPolicySize {
writeErrorResponse(w, ErrEntityTooLarge, r.URL, guessIsBrowserReq(r))
return
}
bucketPolicy, err := policy.ParseConfig(io.LimitReader(r.Body, r.ContentLength), bucket)
if err != nil {
writeErrorResponse(w, ErrMalformedPolicy, r.URL, guessIsBrowserReq(r))
return
}
// Version in policy must not be empty
if bucketPolicy.Version == "" {
writeErrorResponse(w, ErrMalformedPolicy, r.URL, guessIsBrowserReq(r))
return
}
if err = objAPI.SetBucketPolicy(ctx, bucket, bucketPolicy); err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
globalPolicySys.Set(bucket, *bucketPolicy)
globalNotificationSys.SetBucketPolicy(ctx, bucket, bucketPolicy)
// Success.
writeSuccessNoContent(w)
}
// DeleteBucketPolicyHandler - This HTTP handler removes bucket policy configuration.
func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "DeleteBucketPolicy")
defer logger.AuditLog(w, r, "DeleteBucketPolicy", mustGetClaimsFromToken(r))
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL, guessIsBrowserReq(r))
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
if s3Error := checkRequestAuthType(ctx, r, policy.DeleteBucketPolicyAction, bucket, ""); s3Error != ErrNone {
writeErrorResponse(w, s3Error, r.URL, guessIsBrowserReq(r))
return
}
// Check if bucket exists.
if _, err := objAPI.GetBucketInfo(ctx, bucket); err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
if err := objAPI.DeleteBucketPolicy(ctx, bucket); err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
globalPolicySys.Remove(bucket)
globalNotificationSys.RemoveBucketPolicy(ctx, bucket)
// Success.
writeSuccessNoContent(w)
}
// GetBucketPolicyHandler - This HTTP handler returns bucket policy configuration.
func (api objectAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "GetBucketPolicy")
defer logger.AuditLog(w, r, "GetBucketPolicy", mustGetClaimsFromToken(r))
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL, guessIsBrowserReq(r))
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
if s3Error := checkRequestAuthType(ctx, r, policy.GetBucketPolicyAction, bucket, ""); s3Error != ErrNone {
writeErrorResponse(w, s3Error, r.URL, guessIsBrowserReq(r))
return
}
// Check if bucket exists.
if _, err := objAPI.GetBucketInfo(ctx, bucket); err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
// Read bucket access policy.
bucketPolicy, err := objAPI.GetBucketPolicy(ctx, bucket)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
policyData, err := json.Marshal(bucketPolicy)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
// Write to client.
w.Write(policyData)
}