627 lines
19 KiB
Go
627 lines
19 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2016, 2017 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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"context"
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"encoding/xml"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strings"
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"sync"
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"time"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/env"
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)
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// RetentionMode - object retention mode.
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type RetentionMode string
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const (
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// Governance - governance mode.
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Governance RetentionMode = "GOVERNANCE"
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// Compliance - compliance mode.
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Compliance RetentionMode = "COMPLIANCE"
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// Invalid - invalid retention mode.
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Invalid RetentionMode = ""
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)
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func parseRetentionMode(modeStr string) (mode RetentionMode) {
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switch strings.ToUpper(modeStr) {
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case "GOVERNANCE":
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mode = Governance
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case "COMPLIANCE":
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mode = Compliance
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default:
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mode = Invalid
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}
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return mode
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}
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var (
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errMalformedBucketObjectConfig = errors.New("Invalid bucket object lock config")
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errInvalidRetentionDate = errors.New("Date must be provided in ISO 8601 format")
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errPastObjectLockRetainDate = errors.New("the retain until date must be in the future")
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errUnknownWORMModeDirective = errors.New("unknown WORM mode directive")
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errObjectLockMissingContentMD5 = errors.New("Content-MD5 HTTP header is required for Put Object requests with Object Lock parameters")
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errObjectLockInvalidHeaders = errors.New("x-amz-object-lock-retain-until-date and x-amz-object-lock-mode must both be supplied")
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)
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const (
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ntpServerEnv = "MINIO_NTP_SERVER"
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)
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var (
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ntpServer = env.Get(ntpServerEnv, "")
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)
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// Retention - bucket level retention configuration.
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type Retention struct {
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Mode RetentionMode
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Validity time.Duration
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}
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// IsEmpty - returns whether retention is empty or not.
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func (r Retention) IsEmpty() bool {
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return r.Mode == "" || r.Validity == 0
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}
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// Retain - check whether given date is retainable by validity time.
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func (r Retention) Retain(created time.Time) bool {
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t, err := UTCNowNTP()
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if err != nil {
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logger.LogIf(context.Background(), err)
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// Retain
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return true
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}
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return globalWORMEnabled || created.Add(r.Validity).After(t)
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}
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// BucketObjectLockConfig - map of bucket and retention configuration.
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type BucketObjectLockConfig struct {
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sync.RWMutex
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retentionMap map[string]Retention
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}
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// Set - set retention configuration.
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func (config *BucketObjectLockConfig) Set(bucketName string, retention Retention) {
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config.Lock()
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config.retentionMap[bucketName] = retention
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config.Unlock()
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}
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// Get - Get retention configuration.
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func (config *BucketObjectLockConfig) Get(bucketName string) (r Retention, ok bool) {
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config.RLock()
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defer config.RUnlock()
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r, ok = config.retentionMap[bucketName]
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return r, ok
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}
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// Remove - removes retention configuration.
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func (config *BucketObjectLockConfig) Remove(bucketName string) {
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config.Lock()
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delete(config.retentionMap, bucketName)
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config.Unlock()
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}
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func newBucketObjectLockConfig() *BucketObjectLockConfig {
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return &BucketObjectLockConfig{
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retentionMap: map[string]Retention{},
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}
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}
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// DefaultRetention - default retention configuration.
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type DefaultRetention struct {
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XMLName xml.Name `xml:"DefaultRetention"`
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Mode RetentionMode `xml:"Mode"`
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Days *uint64 `xml:"Days"`
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Years *uint64 `xml:"Years"`
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}
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// Maximum support retention days and years supported by AWS S3.
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const (
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// This tested by using `mc lock` command
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maximumRetentionDays = 36500
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maximumRetentionYears = 100
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)
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// UnmarshalXML - decodes XML data.
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func (dr *DefaultRetention) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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// Make subtype to avoid recursive UnmarshalXML().
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type defaultRetention DefaultRetention
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retention := defaultRetention{}
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if err := d.DecodeElement(&retention, &start); err != nil {
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return err
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}
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switch string(retention.Mode) {
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case "GOVERNANCE", "COMPLIANCE":
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default:
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return fmt.Errorf("unknown retention mode %v", retention.Mode)
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}
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if retention.Days == nil && retention.Years == nil {
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return fmt.Errorf("either Days or Years must be specified")
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}
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if retention.Days != nil && retention.Years != nil {
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return fmt.Errorf("either Days or Years must be specified, not both")
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}
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if retention.Days != nil {
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if *retention.Days == 0 {
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return fmt.Errorf("Default retention period must be a positive integer value for 'Days'")
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}
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if *retention.Days > maximumRetentionDays {
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return fmt.Errorf("Default retention period too large for 'Days' %d", *retention.Days)
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}
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} else if *retention.Years == 0 {
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return fmt.Errorf("Default retention period must be a positive integer value for 'Years'")
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} else if *retention.Years > maximumRetentionYears {
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return fmt.Errorf("Default retention period too large for 'Years' %d", *retention.Years)
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}
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*dr = DefaultRetention(retention)
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return nil
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}
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// ObjectLockConfig - object lock configuration specified in
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// https://docs.aws.amazon.com/AmazonS3/latest/API/Type_API_ObjectLockConfiguration.html
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type ObjectLockConfig struct {
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XMLNS string `xml:"xmlns,attr,omitempty"`
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XMLName xml.Name `xml:"ObjectLockConfiguration"`
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ObjectLockEnabled string `xml:"ObjectLockEnabled"`
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Rule *struct {
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DefaultRetention DefaultRetention `xml:"DefaultRetention"`
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} `xml:"Rule,omitempty"`
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}
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// UnmarshalXML - decodes XML data.
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func (config *ObjectLockConfig) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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// Make subtype to avoid recursive UnmarshalXML().
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type objectLockConfig ObjectLockConfig
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parsedConfig := objectLockConfig{}
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if err := d.DecodeElement(&parsedConfig, &start); err != nil {
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return err
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}
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if parsedConfig.ObjectLockEnabled != "Enabled" {
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return fmt.Errorf("only 'Enabled' value is allowd to ObjectLockEnabled element")
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}
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*config = ObjectLockConfig(parsedConfig)
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return nil
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}
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// ToRetention - convert to Retention type.
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func (config *ObjectLockConfig) ToRetention() (r Retention) {
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if config.Rule != nil {
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r.Mode = config.Rule.DefaultRetention.Mode
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t, err := UTCNowNTP()
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if err != nil {
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logger.LogIf(context.Background(), err)
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// Do not change any configuration
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// upon NTP failure.
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return r
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}
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if config.Rule.DefaultRetention.Days != nil {
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r.Validity = t.AddDate(0, 0, int(*config.Rule.DefaultRetention.Days)).Sub(t)
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} else {
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r.Validity = t.AddDate(int(*config.Rule.DefaultRetention.Years), 0, 0).Sub(t)
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}
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}
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return r
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}
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func parseObjectLockConfig(reader io.Reader) (*ObjectLockConfig, error) {
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config := ObjectLockConfig{}
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if err := xml.NewDecoder(reader).Decode(&config); err != nil {
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return nil, err
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}
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return &config, nil
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}
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func newObjectLockConfig() *ObjectLockConfig {
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return &ObjectLockConfig{
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ObjectLockEnabled: "Enabled",
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}
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}
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// RetentionDate is a embedded type containing time.Time to unmarshal
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// Date in Retention
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type RetentionDate struct {
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time.Time
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}
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// UnmarshalXML parses date from Expiration and validates date format
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func (rDate *RetentionDate) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
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var dateStr string
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err := d.DecodeElement(&dateStr, &startElement)
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if err != nil {
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return err
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}
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// While AWS documentation mentions that the date specified
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// must be present in ISO 8601 format, in reality they allow
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// users to provide RFC 3339 compliant dates.
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retDate, err := time.Parse(time.RFC3339, dateStr)
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if err != nil {
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return errInvalidRetentionDate
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}
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*rDate = RetentionDate{retDate}
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return nil
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}
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// MarshalXML encodes expiration date if it is non-zero and encodes
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// empty string otherwise
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func (rDate *RetentionDate) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
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if *rDate == (RetentionDate{time.Time{}}) {
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return nil
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}
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return e.EncodeElement(rDate.Format(time.RFC3339), startElement)
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}
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// ObjectRetention specified in
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// https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectRetention.html
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type ObjectRetention struct {
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XMLNS string `xml:"xmlns,attr,omitempty"`
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XMLName xml.Name `xml:"Retention"`
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Mode RetentionMode `xml:"Mode,omitempty"`
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RetainUntilDate RetentionDate `xml:"RetainUntilDate,omitempty"`
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}
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func parseObjectRetention(reader io.Reader) (*ObjectRetention, error) {
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ret := ObjectRetention{}
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if err := xml.NewDecoder(reader).Decode(&ret); err != nil {
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return nil, err
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}
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if ret.Mode != Compliance && ret.Mode != Governance {
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return &ret, errUnknownWORMModeDirective
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}
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t, err := UTCNowNTP()
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if err != nil {
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logger.LogIf(context.Background(), err)
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return &ret, errPastObjectLockRetainDate
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}
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if ret.RetainUntilDate.Before(t) {
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return &ret, errPastObjectLockRetainDate
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}
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return &ret, nil
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}
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func isObjectLockRetentionRequested(h http.Header) bool {
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if _, ok := h[xhttp.AmzObjectLockMode]; ok {
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return true
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}
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if _, ok := h[xhttp.AmzObjectLockRetainUntilDate]; ok {
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return true
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}
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return false
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}
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func isObjectLockLegalHoldRequested(h http.Header) bool {
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_, ok := h[xhttp.AmzObjectLockLegalHold]
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return ok
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}
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func isObjectLockGovernanceBypassSet(h http.Header) bool {
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v, ok := h[xhttp.AmzObjectLockBypassGovernance]
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if !ok {
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return false
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}
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val := strings.Join(v, "")
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return strings.ToLower(val) == "true"
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}
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func isObjectLockRequested(h http.Header) bool {
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return isObjectLockLegalHoldRequested(h) || isObjectLockRetentionRequested(h)
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}
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func parseObjectLockRetentionHeaders(h http.Header) (rmode RetentionMode, r RetentionDate, err error) {
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retMode, ok := h[xhttp.AmzObjectLockMode]
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if ok {
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rmode = parseRetentionMode(strings.Join(retMode, ""))
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if rmode == Invalid {
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return rmode, r, errUnknownWORMModeDirective
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}
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}
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var retDate time.Time
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dateStr, ok := h[xhttp.AmzObjectLockRetainUntilDate]
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if ok {
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// While AWS documentation mentions that the date specified
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// must be present in ISO 8601 format, in reality they allow
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// users to provide RFC 3339 compliant dates.
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retDate, err = time.Parse(time.RFC3339, strings.Join(dateStr, ""))
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if err != nil {
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return rmode, r, errInvalidRetentionDate
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}
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t, err := UTCNowNTP()
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if err != nil {
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logger.LogIf(context.Background(), err)
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return rmode, r, errPastObjectLockRetainDate
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}
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if retDate.Before(t) {
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return rmode, r, errPastObjectLockRetainDate
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}
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}
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if len(retMode) == 0 || len(dateStr) == 0 {
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return rmode, r, errObjectLockInvalidHeaders
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}
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return rmode, RetentionDate{retDate}, nil
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}
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func getObjectRetentionMeta(meta map[string]string) ObjectRetention {
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var mode RetentionMode
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var retainTill RetentionDate
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if modeStr, ok := meta[strings.ToLower(xhttp.AmzObjectLockMode)]; ok {
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mode = parseRetentionMode(modeStr)
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}
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if tillStr, ok := meta[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)]; ok {
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if t, e := time.Parse(time.RFC3339, tillStr); e == nil {
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retainTill = RetentionDate{t.UTC()}
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}
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}
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return ObjectRetention{Mode: mode, RetainUntilDate: retainTill}
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}
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// enforceRetentionBypassForDelete enforces whether an existing object under governance can be deleted
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// with governance bypass headers set in the request.
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// Objects under site wide WORM can never be overwritten.
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// For objects in "Governance" mode, overwrite is allowed if a) object retention date is past OR
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// governance bypass headers are set and user has governance bypass permissions.
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// Objects in "Compliance" mode can be overwritten only if retention date is past.
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func enforceRetentionBypassForDelete(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, govBypassPerm APIErrorCode) (oi ObjectInfo, s3Err APIErrorCode) {
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if globalWORMEnabled {
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return oi, ErrObjectLocked
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}
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var err error
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var opts ObjectOptions
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opts, err = getOpts(ctx, r, bucket, object)
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if err != nil {
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return oi, toAPIErrorCode(ctx, err)
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}
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oi, err = getObjectInfoFn(ctx, bucket, object, opts)
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if err != nil {
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// ignore case where object no longer exists
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if toAPIError(ctx, err).Code == "NoSuchKey" {
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oi.UserDefined = map[string]string{}
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return oi, ErrNone
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}
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return oi, toAPIErrorCode(ctx, err)
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}
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ret := getObjectRetentionMeta(oi.UserDefined)
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// Here bucket does not support object lock
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if ret.Mode == Invalid {
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return oi, ErrNone
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}
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if ret.Mode != Compliance && ret.Mode != Governance {
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return oi, ErrUnknownWORMModeDirective
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}
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t, err := UTCNowNTP()
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if err != nil {
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logger.LogIf(ctx, err)
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return oi, ErrObjectLocked
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}
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if ret.RetainUntilDate.Before(t) {
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return oi, ErrNone
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}
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if isObjectLockGovernanceBypassSet(r.Header) && ret.Mode == Governance && govBypassPerm == ErrNone {
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return oi, ErrNone
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}
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return oi, ErrObjectLocked
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}
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// enforceRetentionBypassForPut enforces whether an existing object under governance can be overwritten
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// with governance bypass headers set in the request.
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// Objects under site wide WORM cannot be overwritten.
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// For objects in "Governance" mode, overwrite is allowed if a) object retention date is past OR
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// governance bypass headers are set and user has governance bypass permissions.
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// Objects in compliance mode can be overwritten only if retention date is being extended. No mode change is permitted.
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func enforceRetentionBypassForPut(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, govBypassPerm APIErrorCode, objRetention *ObjectRetention) (oi ObjectInfo, s3Err APIErrorCode) {
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if globalWORMEnabled {
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return oi, ErrObjectLocked
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}
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var err error
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var opts ObjectOptions
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opts, err = getOpts(ctx, r, bucket, object)
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if err != nil {
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return oi, toAPIErrorCode(ctx, err)
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}
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oi, err = getObjectInfoFn(ctx, bucket, object, opts)
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if err != nil {
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// ignore case where object no longer exists
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if toAPIError(ctx, err).Code == "NoSuchKey" {
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oi.UserDefined = map[string]string{}
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return oi, ErrNone
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}
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return oi, toAPIErrorCode(ctx, err)
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}
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ret := getObjectRetentionMeta(oi.UserDefined)
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// no retention metadata on object
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if ret.Mode == Invalid {
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_, isWORMBucket := isWORMEnabled(bucket)
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if !isWORMBucket {
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return oi, ErrInvalidBucketObjectLockConfiguration
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}
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return oi, ErrNone
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}
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t, err := UTCNowNTP()
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if err != nil {
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logger.LogIf(ctx, err)
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return oi, ErrObjectLocked
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}
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if ret.Mode == Compliance {
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// Compliance retention mode cannot be changed and retention period cannot be shortened as per
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// https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock-overview.html#object-lock-retention-modes
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if objRetention.Mode != Compliance || objRetention.RetainUntilDate.Before(ret.RetainUntilDate.Time) {
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return oi, ErrObjectLocked
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}
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if objRetention.RetainUntilDate.Before(t) {
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return oi, ErrInvalidRetentionDate
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}
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return oi, ErrNone
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}
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if ret.Mode == Governance {
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if !isObjectLockGovernanceBypassSet(r.Header) {
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if objRetention.RetainUntilDate.Before(t) {
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return oi, ErrInvalidRetentionDate
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}
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if objRetention.RetainUntilDate.Before((ret.RetainUntilDate.Time)) {
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return oi, ErrObjectLocked
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}
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return oi, ErrNone
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}
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return oi, govBypassPerm
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}
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return oi, ErrNone
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}
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// checkPutObjectRetentionAllowed enforces object retention policy for requests with WORM headers
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// See https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock-managing.html for the spec.
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// For non-existing objects with object retention headers set, this method returns ErrNone if bucket has
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// locking enabled and user has requisite permissions (s3:PutObjectRetention)
|
|
// If object exists on object store and site wide WORM enabled - this method
|
|
// returns an error. For objects in "Governance" mode, overwrite is allowed if the retention date has expired.
|
|
// For objects in "Compliance" mode, retention date cannot be shortened, and mode cannot be altered.
|
|
func checkPutObjectRetentionAllowed(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, retentionPermErr APIErrorCode) (RetentionMode, RetentionDate, APIErrorCode) {
|
|
var mode RetentionMode
|
|
var retainDate RetentionDate
|
|
|
|
retention, isWORMBucket := isWORMEnabled(bucket)
|
|
|
|
retentionRequested := isObjectLockRequested(r.Header)
|
|
|
|
var objExists bool
|
|
opts, err := getOpts(ctx, r, bucket, object)
|
|
if err != nil {
|
|
return mode, retainDate, toAPIErrorCode(ctx, err)
|
|
}
|
|
if objInfo, err := getObjectInfoFn(ctx, bucket, object, opts); err == nil {
|
|
objExists = true
|
|
r := getObjectRetentionMeta(objInfo.UserDefined)
|
|
if globalWORMEnabled || r.Mode == Compliance {
|
|
return mode, retainDate, ErrObjectLocked
|
|
}
|
|
mode = r.Mode
|
|
retainDate = r.RetainUntilDate
|
|
}
|
|
if retentionRequested {
|
|
if !isWORMBucket {
|
|
return mode, retainDate, ErrInvalidBucketObjectLockConfiguration
|
|
}
|
|
rMode, rDate, err := parseObjectLockRetentionHeaders(r.Header)
|
|
if err != nil {
|
|
return mode, retainDate, toAPIErrorCode(ctx, err)
|
|
}
|
|
// AWS S3 just creates a new version of object when an object is being overwritten.
|
|
t, err := UTCNowNTP()
|
|
if err != nil {
|
|
logger.LogIf(ctx, err)
|
|
return mode, retainDate, ErrObjectLocked
|
|
}
|
|
if objExists && retainDate.After(t) {
|
|
return mode, retainDate, ErrObjectLocked
|
|
}
|
|
if rMode == Invalid {
|
|
return mode, retainDate, toAPIErrorCode(ctx, errObjectLockInvalidHeaders)
|
|
}
|
|
if retentionPermErr != ErrNone {
|
|
return mode, retainDate, retentionPermErr
|
|
}
|
|
return rMode, rDate, ErrNone
|
|
}
|
|
|
|
if !retentionRequested && isWORMBucket {
|
|
if retention.IsEmpty() && (mode == Compliance || mode == Governance) {
|
|
return mode, retainDate, ErrObjectLocked
|
|
}
|
|
if retentionPermErr != ErrNone {
|
|
return mode, retainDate, retentionPermErr
|
|
}
|
|
t, err := UTCNowNTP()
|
|
if err != nil {
|
|
logger.LogIf(ctx, err)
|
|
return mode, retainDate, ErrObjectLocked
|
|
}
|
|
// AWS S3 just creates a new version of object when an object is being overwritten.
|
|
if objExists && retainDate.After(t) {
|
|
return mode, retainDate, ErrObjectLocked
|
|
}
|
|
// inherit retention from bucket configuration
|
|
return retention.Mode, RetentionDate{t.Add(retention.Validity)}, ErrNone
|
|
}
|
|
return mode, retainDate, ErrNone
|
|
}
|
|
|
|
// filter object lock metadata if s3:GetObjectRetention permission is denied or if isCopy flag set.
|
|
func filterObjectLockMetadata(ctx context.Context, r *http.Request, bucket, object string, metadata map[string]string, isCopy bool, getRetPerms APIErrorCode) map[string]string {
|
|
// Copy on write
|
|
dst := metadata
|
|
var copied bool
|
|
delKey := func(key string) {
|
|
if _, ok := metadata[key]; !ok {
|
|
return
|
|
}
|
|
if !copied {
|
|
dst = make(map[string]string, len(metadata))
|
|
for k, v := range metadata {
|
|
dst[k] = v
|
|
}
|
|
copied = true
|
|
}
|
|
delete(dst, key)
|
|
}
|
|
ret := getObjectRetentionMeta(metadata)
|
|
if ret.Mode == Invalid || isCopy {
|
|
delKey(xhttp.AmzObjectLockMode)
|
|
delKey(xhttp.AmzObjectLockRetainUntilDate)
|
|
return metadata
|
|
}
|
|
if getRetPerms == ErrNone {
|
|
return dst
|
|
}
|
|
delKey(xhttp.AmzObjectLockMode)
|
|
delKey(xhttp.AmzObjectLockRetainUntilDate)
|
|
return dst
|
|
}
|