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Copy pathbucket-metadata.go
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455 lines (406 loc) · 14.1 KB
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"context"
"crypto/rand"
"encoding/binary"
"encoding/json"
"encoding/xml"
"errors"
"fmt"
"path"
"time"
"github.com/minio/madmin-go"
"github.com/minio/minio-go/v7/pkg/tags"
bucketsse "github.com/minio/minio/internal/bucket/encryption"
"github.com/minio/minio/internal/bucket/lifecycle"
objectlock "github.com/minio/minio/internal/bucket/object/lock"
"github.com/minio/minio/internal/bucket/replication"
"github.com/minio/minio/internal/bucket/versioning"
"github.com/minio/minio/internal/crypto"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/fips"
"github.com/minio/minio/internal/kms"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/bucket/policy"
"github.com/minio/sio"
)
const (
legacyBucketObjectLockEnabledConfigFile = "object-lock-enabled.json"
legacyBucketObjectLockEnabledConfig = `{"x-amz-bucket-object-lock-enabled":true}`
bucketMetadataFile = ".metadata.bin"
bucketMetadataFormat = 1
bucketMetadataVersion = 1
)
var (
enabledBucketObjectLockConfig = []byte(`<ObjectLockConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><ObjectLockEnabled>Enabled</ObjectLockEnabled></ObjectLockConfiguration>`)
enabledBucketVersioningConfig = []byte(`<VersioningConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Status>Enabled</Status></VersioningConfiguration>`)
)
//go:generate msgp -file $GOFILE
// BucketMetadata contains bucket metadata.
// When adding/removing fields, regenerate the marshal code using the go generate above.
// Only changing meaning of fields requires a version bump.
// bucketMetadataFormat refers to the format.
// bucketMetadataVersion can be used to track a rolling upgrade of a field.
type BucketMetadata struct {
Name string
Created time.Time
LockEnabled bool // legacy not used anymore.
PolicyConfigJSON []byte
NotificationConfigXML []byte
LifecycleConfigXML []byte
ObjectLockConfigXML []byte
VersioningConfigXML []byte
EncryptionConfigXML []byte
TaggingConfigXML []byte
QuotaConfigJSON []byte
ReplicationConfigXML []byte
BucketTargetsConfigJSON []byte
BucketTargetsConfigMetaJSON []byte
// Unexported fields. Must be updated atomically.
policyConfig *policy.Policy
notificationConfig *event.Config
lifecycleConfig *lifecycle.Lifecycle
objectLockConfig *objectlock.Config
versioningConfig *versioning.Versioning
sseConfig *bucketsse.BucketSSEConfig
taggingConfig *tags.Tags
quotaConfig *madmin.BucketQuota
replicationConfig *replication.Config
bucketTargetConfig *madmin.BucketTargets
bucketTargetConfigMeta map[string]string
}
// newBucketMetadata creates BucketMetadata with the supplied name and Created to Now.
func newBucketMetadata(name string) BucketMetadata {
return BucketMetadata{
Name: name,
Created: UTCNow(),
notificationConfig: &event.Config{
XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/",
},
quotaConfig: &madmin.BucketQuota{},
versioningConfig: &versioning.Versioning{
XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/",
},
bucketTargetConfig: &madmin.BucketTargets{},
bucketTargetConfigMeta: make(map[string]string),
}
}
// Load - loads the metadata of bucket by name from ObjectLayer api.
// If an error is returned the returned metadata will be default initialized.
func (b *BucketMetadata) Load(ctx context.Context, api ObjectLayer, name string) error {
if name == "" {
logger.LogIf(ctx, errors.New("bucket name cannot be empty"))
return errors.New("bucket name cannot be empty")
}
configFile := path.Join(bucketConfigPrefix, name, bucketMetadataFile)
data, err := readConfig(ctx, api, configFile)
if err != nil {
return err
}
if len(data) <= 4 {
return fmt.Errorf("loadBucketMetadata: no data")
}
// Read header
switch binary.LittleEndian.Uint16(data[0:2]) {
case bucketMetadataFormat:
default:
return fmt.Errorf("loadBucketMetadata: unknown format: %d", binary.LittleEndian.Uint16(data[0:2]))
}
switch binary.LittleEndian.Uint16(data[2:4]) {
case bucketMetadataVersion:
default:
return fmt.Errorf("loadBucketMetadata: unknown version: %d", binary.LittleEndian.Uint16(data[2:4]))
}
// OK, parse data.
_, err = b.UnmarshalMsg(data[4:])
b.Name = name // in-case parsing failed for some reason, make sure bucket name is not empty.
return err
}
// loadBucketMetadata loads and migrates to bucket metadata.
func loadBucketMetadata(ctx context.Context, objectAPI ObjectLayer, bucket string) (BucketMetadata, error) {
b := newBucketMetadata(bucket)
err := b.Load(ctx, objectAPI, b.Name)
if err != nil && !errors.Is(err, errConfigNotFound) {
return b, err
}
// Old bucket without bucket metadata. Hence we migrate existing settings.
if err := b.convertLegacyConfigs(ctx, objectAPI); err != nil {
return b, err
}
// migrate unencrypted remote targets
return b, b.migrateTargetConfig(ctx, objectAPI)
}
// parseAllConfigs will parse all configs and populate the private fields.
// The first error encountered is returned.
func (b *BucketMetadata) parseAllConfigs(ctx context.Context, objectAPI ObjectLayer) (err error) {
if len(b.PolicyConfigJSON) != 0 {
b.policyConfig, err = policy.ParseConfig(bytes.NewReader(b.PolicyConfigJSON), b.Name)
if err != nil {
return err
}
} else {
b.policyConfig = nil
}
if len(b.NotificationConfigXML) != 0 {
if err = xml.Unmarshal(b.NotificationConfigXML, b.notificationConfig); err != nil {
return err
}
}
if len(b.LifecycleConfigXML) != 0 {
b.lifecycleConfig, err = lifecycle.ParseLifecycleConfig(bytes.NewReader(b.LifecycleConfigXML))
if err != nil {
return err
}
} else {
b.lifecycleConfig = nil
}
if len(b.EncryptionConfigXML) != 0 {
b.sseConfig, err = bucketsse.ParseBucketSSEConfig(bytes.NewReader(b.EncryptionConfigXML))
if err != nil {
return err
}
} else {
b.sseConfig = nil
}
if len(b.TaggingConfigXML) != 0 {
b.taggingConfig, err = tags.ParseBucketXML(bytes.NewReader(b.TaggingConfigXML))
if err != nil {
return err
}
} else {
b.taggingConfig = nil
}
if bytes.Equal(b.ObjectLockConfigXML, enabledBucketObjectLockConfig) {
b.VersioningConfigXML = enabledBucketVersioningConfig
}
if len(b.ObjectLockConfigXML) != 0 {
b.objectLockConfig, err = objectlock.ParseObjectLockConfig(bytes.NewReader(b.ObjectLockConfigXML))
if err != nil {
return err
}
} else {
b.objectLockConfig = nil
}
if len(b.VersioningConfigXML) != 0 {
b.versioningConfig, err = versioning.ParseConfig(bytes.NewReader(b.VersioningConfigXML))
if err != nil {
return err
}
}
if len(b.QuotaConfigJSON) != 0 {
b.quotaConfig, err = parseBucketQuota(b.Name, b.QuotaConfigJSON)
if err != nil {
return err
}
}
if len(b.ReplicationConfigXML) != 0 {
b.replicationConfig, err = replication.ParseConfig(bytes.NewReader(b.ReplicationConfigXML))
if err != nil {
return err
}
} else {
b.replicationConfig = nil
}
if len(b.BucketTargetsConfigJSON) != 0 {
b.bucketTargetConfig, err = parseBucketTargetConfig(b.Name, b.BucketTargetsConfigJSON, b.BucketTargetsConfigMetaJSON)
if err != nil {
return err
}
} else {
b.bucketTargetConfig = &madmin.BucketTargets{}
}
return nil
}
func (b *BucketMetadata) convertLegacyConfigs(ctx context.Context, objectAPI ObjectLayer) error {
legacyConfigs := []string{
legacyBucketObjectLockEnabledConfigFile,
bucketPolicyConfig,
bucketNotificationConfig,
bucketLifecycleConfig,
bucketQuotaConfigFile,
bucketSSEConfig,
bucketTaggingConfig,
bucketReplicationConfig,
bucketTargetsFile,
objectLockConfig,
}
configs := make(map[string][]byte)
// Handle migration from lockEnabled to newer format.
if b.LockEnabled {
configs[objectLockConfig] = enabledBucketObjectLockConfig
b.LockEnabled = false // legacy value unset it
// we are only interested in b.ObjectLockConfigXML or objectLockConfig value
}
for _, legacyFile := range legacyConfigs {
configFile := path.Join(bucketConfigPrefix, b.Name, legacyFile)
configData, err := readConfig(ctx, objectAPI, configFile)
if err != nil {
switch err.(type) {
case ObjectExistsAsDirectory:
// in FS mode it possible that we have actual
// files in this folder with `.minio.sys/buckets/bucket/configFile`
continue
}
if errors.Is(err, errConfigNotFound) {
// legacy file config not found, proceed to look for new metadata.
continue
}
return err
}
configs[legacyFile] = configData
}
if len(configs) == 0 {
// nothing to update, return right away.
return b.parseAllConfigs(ctx, objectAPI)
}
for legacyFile, configData := range configs {
switch legacyFile {
case legacyBucketObjectLockEnabledConfigFile:
if string(configData) == legacyBucketObjectLockEnabledConfig {
b.ObjectLockConfigXML = enabledBucketObjectLockConfig
b.VersioningConfigXML = enabledBucketVersioningConfig
b.LockEnabled = false // legacy value unset it
// we are only interested in b.ObjectLockConfigXML
}
case bucketPolicyConfig:
b.PolicyConfigJSON = configData
case bucketNotificationConfig:
b.NotificationConfigXML = configData
case bucketLifecycleConfig:
b.LifecycleConfigXML = configData
case bucketSSEConfig:
b.EncryptionConfigXML = configData
case bucketTaggingConfig:
b.TaggingConfigXML = configData
case objectLockConfig:
b.ObjectLockConfigXML = configData
b.VersioningConfigXML = enabledBucketVersioningConfig
case bucketQuotaConfigFile:
b.QuotaConfigJSON = configData
case bucketReplicationConfig:
b.ReplicationConfigXML = configData
case bucketTargetsFile:
b.BucketTargetsConfigJSON = configData
}
}
if err := b.Save(ctx, objectAPI); err != nil {
return err
}
for legacyFile := range configs {
configFile := path.Join(bucketConfigPrefix, b.Name, legacyFile)
if err := deleteConfig(ctx, objectAPI, configFile); err != nil && !errors.Is(err, errConfigNotFound) {
logger.LogIf(ctx, err)
}
}
return nil
}
// Save config to supplied ObjectLayer api.
func (b *BucketMetadata) Save(ctx context.Context, api ObjectLayer) error {
if err := b.parseAllConfigs(ctx, api); err != nil {
return err
}
data := make([]byte, 4, b.Msgsize()+4)
// Initialize the header.
binary.LittleEndian.PutUint16(data[0:2], bucketMetadataFormat)
binary.LittleEndian.PutUint16(data[2:4], bucketMetadataVersion)
// Marshal the bucket metadata
data, err := b.MarshalMsg(data)
if err != nil {
return err
}
configFile := path.Join(bucketConfigPrefix, b.Name, bucketMetadataFile)
return saveConfig(ctx, api, configFile, data)
}
// deleteBucketMetadata deletes bucket metadata
// If config does not exist no error is returned.
func deleteBucketMetadata(ctx context.Context, obj objectDeleter, bucket string) error {
metadataFiles := []string{
dataUsageCacheName,
bucketMetadataFile,
}
for _, metaFile := range metadataFiles {
configFile := path.Join(bucketConfigPrefix, bucket, metaFile)
if err := deleteConfig(ctx, obj, configFile); err != nil && err != errConfigNotFound {
return err
}
}
return nil
}
// migrate config for remote targets by encrypting data if currently unencrypted and kms is configured.
func (b *BucketMetadata) migrateTargetConfig(ctx context.Context, objectAPI ObjectLayer) error {
var err error
// early return if no targets or already encrypted
if len(b.BucketTargetsConfigJSON) == 0 || GlobalKMS == nil || len(b.BucketTargetsConfigMetaJSON) != 0 {
return nil
}
encBytes, metaBytes, err := encryptBucketMetadata(b.Name, b.BucketTargetsConfigJSON, kms.Context{b.Name: b.Name, bucketTargetsFile: bucketTargetsFile})
if err != nil {
return err
}
b.BucketTargetsConfigJSON = encBytes
b.BucketTargetsConfigMetaJSON = metaBytes
return b.Save(ctx, objectAPI)
}
// encrypt bucket metadata if kms is configured.
func encryptBucketMetadata(bucket string, input []byte, kmsContext kms.Context) (output, metabytes []byte, err error) {
if GlobalKMS == nil {
output = input
return
}
metadata := make(map[string]string)
key, err := GlobalKMS.GenerateKey("", kmsContext)
if err != nil {
return
}
outbuf := bytes.NewBuffer(nil)
objectKey := crypto.GenerateKey(key.Plaintext, rand.Reader)
sealedKey := objectKey.Seal(key.Plaintext, crypto.GenerateIV(rand.Reader), crypto.S3.String(), bucket, "")
crypto.S3.CreateMetadata(metadata, key.KeyID, key.Ciphertext, sealedKey)
_, err = sio.Encrypt(outbuf, bytes.NewBuffer(input), sio.Config{Key: objectKey[:], MinVersion: sio.Version20, CipherSuites: fips.CipherSuitesDARE()})
if err != nil {
return output, metabytes, err
}
metabytes, err = json.Marshal(metadata)
if err != nil {
return
}
return outbuf.Bytes(), metabytes, nil
}
// decrypt bucket metadata if kms is configured.
func decryptBucketMetadata(input []byte, bucket string, meta map[string]string, kmsContext kms.Context) ([]byte, error) {
if GlobalKMS == nil {
return nil, errKMSNotConfigured
}
keyID, kmsKey, sealedKey, err := crypto.S3.ParseMetadata(meta)
if err != nil {
return nil, err
}
extKey, err := GlobalKMS.DecryptKey(keyID, kmsKey, kmsContext)
if err != nil {
return nil, err
}
var objectKey crypto.ObjectKey
if err = objectKey.Unseal(extKey, sealedKey, crypto.S3.String(), bucket, ""); err != nil {
return nil, err
}
outbuf := bytes.NewBuffer(nil)
_, err = sio.Decrypt(outbuf, bytes.NewBuffer(input), sio.Config{Key: objectKey[:], MinVersion: sio.Version20, CipherSuites: fips.CipherSuitesDARE()})
return outbuf.Bytes(), err
}