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minio/cmd/bucket-encryption.go

170 lines
5.0 KiB

/*
* MinIO Cloud Storage, (C) 2020 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"
"context"
"encoding/xml"
"errors"
"io"
"path"
"sync"
bucketsse "github.com/minio/minio/pkg/bucket/encryption"
)
// BucketSSEConfigSys - in-memory cache of bucket encryption config
type BucketSSEConfigSys struct {
sync.RWMutex
bucketSSEConfigMap map[string]bucketsse.BucketSSEConfig
}
// NewBucketSSEConfigSys - Creates an empty in-memory bucket encryption configuration cache
func NewBucketSSEConfigSys() *BucketSSEConfigSys {
return &BucketSSEConfigSys{
bucketSSEConfigMap: make(map[string]bucketsse.BucketSSEConfig),
}
}
// load - Loads the bucket encryption configuration for the given list of buckets
func (sys *BucketSSEConfigSys) load(buckets []BucketInfo, objAPI ObjectLayer) error {
for _, bucket := range buckets {
config, err := objAPI.GetBucketSSEConfig(GlobalContext, bucket.Name)
if err != nil {
if _, ok := err.(BucketSSEConfigNotFound); ok {
sys.Remove(bucket.Name)
}
continue
}
sys.Set(bucket.Name, *config)
}
return nil
}
// Init - Initializes in-memory bucket encryption config cache for the given list of buckets
func (sys *BucketSSEConfigSys) Init(buckets []BucketInfo, objAPI ObjectLayer) error {
if objAPI == nil {
return errServerNotInitialized
}
// We don't cache bucket encryption config in gateway mode, nothing to do.
if globalIsGateway {
return nil
}
// Load bucket encryption config cache once during boot.
return sys.load(buckets, objAPI)
}
// Get - gets bucket encryption config for the given bucket.
func (sys *BucketSSEConfigSys) Get(bucket string) (config bucketsse.BucketSSEConfig, ok bool) {
// We don't cache bucket encryption config in gateway mode.
if globalIsGateway {
objAPI := newObjectLayerWithoutSafeModeFn()
if objAPI == nil {
return
}
cfg, err := objAPI.GetBucketSSEConfig(GlobalContext, bucket)
if err != nil {
return
}
return *cfg, true
}
sys.Lock()
defer sys.Unlock()
config, ok = sys.bucketSSEConfigMap[bucket]
return
}
// Set - sets bucket encryption config to given bucket name.
func (sys *BucketSSEConfigSys) Set(bucket string, config bucketsse.BucketSSEConfig) {
// We don't cache bucket encryption config in gateway mode.
if globalIsGateway {
return
}
sys.Lock()
defer sys.Unlock()
sys.bucketSSEConfigMap[bucket] = config
}
// Remove - removes bucket encryption config for given bucket.
func (sys *BucketSSEConfigSys) Remove(bucket string) {
sys.Lock()
defer sys.Unlock()
delete(sys.bucketSSEConfigMap, bucket)
}
// saveBucketSSEConfig - save bucket encryption config for given bucket.
func saveBucketSSEConfig(ctx context.Context, objAPI ObjectLayer, bucket string, config *bucketsse.BucketSSEConfig) error {
data, err := xml.Marshal(config)
if err != nil {
return err
}
// Path to store bucket encryption config for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucket, bucketSSEConfig)
return saveConfig(ctx, objAPI, configFile, data)
}
// getBucketSSEConfig - get bucket encryption config for given bucket.
func getBucketSSEConfig(objAPI ObjectLayer, bucket string) (*bucketsse.BucketSSEConfig, error) {
// Path to bucket-encryption.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucket, bucketSSEConfig)
configData, err := readConfig(GlobalContext, objAPI, configFile)
if err != nil {
if err == errConfigNotFound {
err = BucketSSEConfigNotFound{Bucket: bucket}
}
return nil, err
}
return bucketsse.ParseBucketSSEConfig(bytes.NewReader(configData))
}
// removeBucketSSEConfig - removes bucket encryption config for given bucket.
func removeBucketSSEConfig(ctx context.Context, objAPI ObjectLayer, bucket string) error {
// Path to bucket-encryption.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucket, bucketSSEConfig)
if err := objAPI.DeleteObject(ctx, minioMetaBucket, configFile); err != nil {
if _, ok := err.(ObjectNotFound); ok {
return BucketSSEConfigNotFound{Bucket: bucket}
}
return err
}
return nil
}
// validateBucketSSEConfig parses bucket encryption configuration and validates if it is supported by MinIO.
func validateBucketSSEConfig(r io.Reader) (*bucketsse.BucketSSEConfig, error) {
encConfig, err := bucketsse.ParseBucketSSEConfig(r)
if err != nil {
return nil, err
}
if len(encConfig.Rules) == 1 && encConfig.Rules[0].DefaultEncryptionAction.Algorithm == bucketsse.AES256 {
return encConfig, nil
}
return nil, errors.New("Unsupported bucket encryption configuration")
}