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Copy pathconfig-encrypted.go
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301 lines (260 loc) · 8.03 KB
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/*
* MinIO Cloud Storage, (C) 2019 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"
"fmt"
"time"
"unicode/utf8"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/auth"
"github.com/minio/minio/pkg/madmin"
etcd "go.etcd.io/etcd/v3/clientv3"
)
func handleEncryptedConfigBackend(objAPI ObjectLayer) error {
encrypted, err := checkBackendEncrypted(objAPI)
if err != nil {
return fmt.Errorf("Unable to encrypt config %w", err)
}
if encrypted {
// backend is encrypted, but credentials are not specified
// we shall fail right here. if not proceed forward.
if !globalConfigEncrypted || !globalActiveCred.IsValid() {
return config.ErrMissingCredentialsBackendEncrypted(nil)
}
} else {
// backend is not yet encrypted, check if encryption of
// backend is requested if not return nil and proceed
// forward.
if !globalConfigEncrypted {
return nil
}
if !globalActiveCred.IsValid() {
return config.ErrMissingCredentialsBackendEncrypted(nil)
}
}
// Migrate IAM configuration
if err = migrateConfigPrefixToEncrypted(objAPI, globalOldCred, encrypted); err != nil {
return fmt.Errorf("Unable to migrate all config at .minio.sys/config/: %w", err)
}
return nil
}
const (
backendEncryptedFile = "backend-encrypted"
)
var (
backendEncryptedMigrationIncomplete = []byte("incomplete")
backendEncryptedMigrationComplete = []byte("encrypted")
)
func checkBackendEtcdEncrypted(ctx context.Context, client *etcd.Client) (bool, error) {
data, err := readKeyEtcd(ctx, client, backendEncryptedFile)
if err != nil && err != errConfigNotFound {
return false, err
}
return err == nil && bytes.Equal(data, backendEncryptedMigrationComplete), nil
}
func checkBackendEncrypted(objAPI ObjectLayer) (bool, error) {
data, err := readConfig(GlobalContext, objAPI, backendEncryptedFile)
if err != nil && err != errConfigNotFound {
return false, err
}
return err == nil && bytes.Equal(data, backendEncryptedMigrationComplete), nil
}
// decryptData - decrypts input data with more that one credentials,
func decryptData(edata []byte, creds ...auth.Credentials) ([]byte, error) {
var err error
var data []byte
for _, cred := range creds {
data, err = madmin.DecryptData(cred.String(), bytes.NewReader(edata))
if err != nil {
if err == madmin.ErrMaliciousData {
continue
}
return nil, err
}
break
}
return data, err
}
func migrateIAMConfigsEtcdToEncrypted(ctx context.Context, client *etcd.Client) error {
encrypted, err := checkBackendEtcdEncrypted(ctx, client)
if err != nil {
return err
}
if encrypted {
// backend is encrypted, but credentials are not specified
// we shall fail right here. if not proceed forward.
if !globalConfigEncrypted || !globalActiveCred.IsValid() {
return config.ErrMissingCredentialsBackendEncrypted(nil)
}
} else {
// backend is not yet encrypted, check if encryption of
// backend is requested if not return nil and proceed
// forward.
if !globalConfigEncrypted {
return nil
}
if !globalActiveCred.IsValid() {
return errInvalidArgument
}
}
if encrypted {
// No key rotation requested, and backend is
// already encrypted. We proceed without migration.
if !globalOldCred.IsValid() {
return nil
}
// No real reason to rotate if old and new creds are same.
if globalOldCred.Equal(globalActiveCred) {
return nil
}
logger.Info("Attempting rotation of encrypted IAM users and policies on etcd with newly supplied credentials")
} else {
logger.Info("Attempting encryption of all IAM users and policies on etcd")
}
listCtx, cancel := context.WithTimeout(ctx, 1*time.Minute)
defer cancel()
r, err := client.Get(listCtx, minioConfigPrefix, etcd.WithPrefix(), etcd.WithKeysOnly())
if err != nil {
return err
}
if err = saveKeyEtcd(ctx, client, backendEncryptedFile, backendEncryptedMigrationIncomplete); err != nil {
return err
}
for _, kv := range r.Kvs {
var (
cdata []byte
cencdata []byte
)
cdata, err = readKeyEtcd(ctx, client, string(kv.Key))
if err != nil {
switch err {
case errConfigNotFound:
// Perhaps not present or someone deleted it.
continue
}
return err
}
var data []byte
// Is rotating of creds requested?
if globalOldCred.IsValid() {
data, err = decryptData(cdata, globalOldCred, globalActiveCred)
if err != nil {
if err == madmin.ErrMaliciousData {
return config.ErrInvalidRotatingCredentialsBackendEncrypted(nil)
}
return err
}
} else {
data = cdata
}
if !utf8.Valid(data) {
_, err = decryptData(data, globalActiveCred)
if err == nil {
// Config is already encrypted with right keys
continue
}
return fmt.Errorf("Decrypting config failed %w, possibly credentials are incorrect", err)
}
cencdata, err = madmin.EncryptData(globalActiveCred.String(), data)
if err != nil {
return err
}
if err = saveKeyEtcd(ctx, client, string(kv.Key), cencdata); err != nil {
return err
}
}
if encrypted && globalActiveCred.IsValid() && globalOldCred.IsValid() {
logger.Info("Rotation complete, please make sure to unset MINIO_ACCESS_KEY_OLD and MINIO_SECRET_KEY_OLD envs")
}
return saveKeyEtcd(ctx, client, backendEncryptedFile, backendEncryptedMigrationComplete)
}
func migrateConfigPrefixToEncrypted(objAPI ObjectLayer, activeCredOld auth.Credentials, encrypted bool) error {
if encrypted {
// No key rotation requested, and backend is
// already encrypted. We proceed without migration.
if !activeCredOld.IsValid() {
return nil
}
// No real reason to rotate if old and new creds are same.
if activeCredOld.Equal(globalActiveCred) {
return nil
}
logger.Info("Attempting rotation of encrypted config, IAM users and policies on MinIO with newly supplied credentials")
} else {
logger.Info("Attempting encryption of all config, IAM users and policies on MinIO backend")
}
err := saveConfig(GlobalContext, objAPI, backendEncryptedFile, backendEncryptedMigrationIncomplete)
if err != nil {
return err
}
var marker string
for {
res, err := objAPI.ListObjects(GlobalContext, minioMetaBucket,
minioConfigPrefix, marker, "", maxObjectList)
if err != nil {
return err
}
for _, obj := range res.Objects {
var (
cdata []byte
cencdata []byte
)
cdata, err = readConfig(GlobalContext, objAPI, obj.Name)
if err != nil {
return err
}
var data []byte
// Is rotating of creds requested?
if activeCredOld.IsValid() {
data, err = decryptData(cdata, activeCredOld, globalActiveCred)
if err != nil {
if err == madmin.ErrMaliciousData {
return config.ErrInvalidRotatingCredentialsBackendEncrypted(nil)
}
return err
}
} else {
data = cdata
}
if !utf8.Valid(data) {
_, err = decryptData(data, globalActiveCred)
if err == nil {
// Config is already encrypted with right keys
continue
}
return fmt.Errorf("Decrypting config failed %w, possibly credentials are incorrect", err)
}
cencdata, err = madmin.EncryptData(globalActiveCred.String(), data)
if err != nil {
return err
}
if err = saveConfig(GlobalContext, objAPI, obj.Name, cencdata); err != nil {
return err
}
}
if !res.IsTruncated {
break
}
marker = res.NextMarker
}
if encrypted && globalActiveCred.IsValid() && activeCredOld.IsValid() {
logger.Info("Rotation complete, please make sure to unset MINIO_ACCESS_KEY_OLD and MINIO_SECRET_KEY_OLD envs")
}
return saveConfig(GlobalContext, objAPI, backendEncryptedFile, backendEncryptedMigrationComplete)
}