mirror of
https://github.com/minio/minio.git
synced 2024-12-30 09:03:22 -05:00
587 lines
17 KiB
Go
587 lines
17 KiB
Go
// 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 lock
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"encoding/xml"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"net/textproto"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/beevik/ntp"
|
|
"github.com/minio/minio/internal/amztime"
|
|
xhttp "github.com/minio/minio/internal/http"
|
|
|
|
"github.com/minio/minio/internal/logger"
|
|
"github.com/minio/pkg/env"
|
|
)
|
|
|
|
// Enabled indicates object locking is enabled
|
|
const Enabled = "Enabled"
|
|
|
|
// RetMode - object retention mode.
|
|
type RetMode string
|
|
|
|
const (
|
|
// RetGovernance - governance mode.
|
|
RetGovernance RetMode = "GOVERNANCE"
|
|
|
|
// RetCompliance - compliance mode.
|
|
RetCompliance RetMode = "COMPLIANCE"
|
|
)
|
|
|
|
// Valid - returns if retention mode is valid
|
|
func (r RetMode) Valid() bool {
|
|
switch r {
|
|
case RetGovernance, RetCompliance:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func parseRetMode(modeStr string) (mode RetMode) {
|
|
switch strings.ToUpper(modeStr) {
|
|
case "GOVERNANCE":
|
|
mode = RetGovernance
|
|
case "COMPLIANCE":
|
|
mode = RetCompliance
|
|
}
|
|
return mode
|
|
}
|
|
|
|
// LegalHoldStatus - object legal hold status.
|
|
type LegalHoldStatus string
|
|
|
|
const (
|
|
// LegalHoldOn - legal hold is on.
|
|
LegalHoldOn LegalHoldStatus = "ON"
|
|
|
|
// LegalHoldOff - legal hold is off.
|
|
LegalHoldOff LegalHoldStatus = "OFF"
|
|
)
|
|
|
|
// Valid - returns true if legal hold status has valid values
|
|
func (l LegalHoldStatus) Valid() bool {
|
|
switch l {
|
|
case LegalHoldOn, LegalHoldOff:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func parseLegalHoldStatus(holdStr string) (st LegalHoldStatus) {
|
|
switch strings.ToUpper(holdStr) {
|
|
case "ON":
|
|
st = LegalHoldOn
|
|
case "OFF":
|
|
st = LegalHoldOff
|
|
}
|
|
return st
|
|
}
|
|
|
|
// Bypass retention governance header.
|
|
const (
|
|
AmzObjectLockBypassRetGovernance = "X-Amz-Bypass-Governance-Retention"
|
|
AmzObjectLockRetainUntilDate = "X-Amz-Object-Lock-Retain-Until-Date"
|
|
AmzObjectLockMode = "X-Amz-Object-Lock-Mode"
|
|
AmzObjectLockLegalHold = "X-Amz-Object-Lock-Legal-Hold"
|
|
)
|
|
|
|
var (
|
|
// ErrMalformedBucketObjectConfig -indicates that the bucket object lock config is malformed
|
|
ErrMalformedBucketObjectConfig = errors.New("invalid bucket object lock config")
|
|
// ErrInvalidRetentionDate - indicates that retention date needs to be in ISO 8601 format
|
|
ErrInvalidRetentionDate = errors.New("date must be provided in ISO 8601 format")
|
|
// ErrPastObjectLockRetainDate - indicates that retention date must be in the future
|
|
ErrPastObjectLockRetainDate = errors.New("the retain until date must be in the future")
|
|
// ErrUnknownWORMModeDirective - indicates that the retention mode is invalid
|
|
ErrUnknownWORMModeDirective = errors.New("unknown WORM mode directive")
|
|
// ErrObjectLockMissingContentMD5 - indicates missing Content-MD5 header for put object requests with locking
|
|
ErrObjectLockMissingContentMD5 = errors.New("content-MD5 HTTP header is required for Put Object requests with Object Lock parameters")
|
|
// ErrObjectLockInvalidHeaders indicates that object lock headers are missing
|
|
ErrObjectLockInvalidHeaders = errors.New("x-amz-object-lock-retain-until-date and x-amz-object-lock-mode must both be supplied")
|
|
// ErrMalformedXML - generic error indicating malformed XML
|
|
ErrMalformedXML = errors.New("the XML you provided was not well-formed or did not validate against our published schema")
|
|
)
|
|
|
|
const (
|
|
ntpServerEnv = "MINIO_NTP_SERVER"
|
|
)
|
|
|
|
var ntpServer = env.Get(ntpServerEnv, "")
|
|
|
|
// UTCNowNTP - is similar in functionality to UTCNow()
|
|
// but only used when we do not wish to rely on system
|
|
// time.
|
|
func UTCNowNTP() (time.Time, error) {
|
|
// ntp server is disabled
|
|
if ntpServer == "" {
|
|
return time.Now().UTC(), nil
|
|
}
|
|
return ntp.Time(ntpServer)
|
|
}
|
|
|
|
// Retention - bucket level retention configuration.
|
|
type Retention struct {
|
|
Mode RetMode
|
|
Validity time.Duration
|
|
LockEnabled bool
|
|
}
|
|
|
|
// Retain - check whether given date is retainable by validity time.
|
|
func (r Retention) Retain(created time.Time) bool {
|
|
t, err := UTCNowNTP()
|
|
if err != nil {
|
|
logger.LogIf(context.Background(), err)
|
|
// Retain
|
|
return true
|
|
}
|
|
return created.Add(r.Validity).After(t)
|
|
}
|
|
|
|
// DefaultRetention - default retention configuration.
|
|
type DefaultRetention struct {
|
|
XMLName xml.Name `xml:"DefaultRetention"`
|
|
Mode RetMode `xml:"Mode"`
|
|
Days *uint64 `xml:"Days"`
|
|
Years *uint64 `xml:"Years"`
|
|
}
|
|
|
|
// Maximum support retention days and years supported by AWS S3.
|
|
const (
|
|
// This tested by using `mc lock` command
|
|
maximumRetentionDays = 36500
|
|
maximumRetentionYears = 100
|
|
)
|
|
|
|
// UnmarshalXML - decodes XML data.
|
|
func (dr *DefaultRetention) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
|
|
// Make subtype to avoid recursive UnmarshalXML().
|
|
type defaultRetention DefaultRetention
|
|
retention := defaultRetention{}
|
|
|
|
if err := d.DecodeElement(&retention, &start); err != nil {
|
|
return err
|
|
}
|
|
|
|
switch retention.Mode {
|
|
case RetGovernance, RetCompliance:
|
|
default:
|
|
return fmt.Errorf("unknown retention mode %v", retention.Mode)
|
|
}
|
|
|
|
if retention.Days == nil && retention.Years == nil {
|
|
return fmt.Errorf("either Days or Years must be specified")
|
|
}
|
|
|
|
if retention.Days != nil && retention.Years != nil {
|
|
return fmt.Errorf("either Days or Years must be specified, not both")
|
|
}
|
|
|
|
//nolint:gocritic
|
|
if retention.Days != nil {
|
|
if *retention.Days == 0 {
|
|
return fmt.Errorf("Default retention period must be a positive integer value for 'Days'")
|
|
}
|
|
if *retention.Days > maximumRetentionDays {
|
|
return fmt.Errorf("Default retention period too large for 'Days' %d", *retention.Days)
|
|
}
|
|
} else if *retention.Years == 0 {
|
|
return fmt.Errorf("Default retention period must be a positive integer value for 'Years'")
|
|
} else if *retention.Years > maximumRetentionYears {
|
|
return fmt.Errorf("Default retention period too large for 'Years' %d", *retention.Years)
|
|
}
|
|
|
|
*dr = DefaultRetention(retention)
|
|
|
|
return nil
|
|
}
|
|
|
|
// Config - object lock configuration specified in
|
|
// https://docs.aws.amazon.com/AmazonS3/latest/API/Type_API_ObjectLockConfiguration.html
|
|
type Config struct {
|
|
XMLNS string `xml:"xmlns,attr,omitempty"`
|
|
XMLName xml.Name `xml:"ObjectLockConfiguration"`
|
|
ObjectLockEnabled string `xml:"ObjectLockEnabled"`
|
|
Rule *struct {
|
|
DefaultRetention DefaultRetention `xml:"DefaultRetention"`
|
|
} `xml:"Rule,omitempty"`
|
|
}
|
|
|
|
// UnmarshalXML - decodes XML data.
|
|
func (config *Config) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
|
|
// Make subtype to avoid recursive UnmarshalXML().
|
|
type objectLockConfig Config
|
|
parsedConfig := objectLockConfig{}
|
|
|
|
if err := d.DecodeElement(&parsedConfig, &start); err != nil {
|
|
return err
|
|
}
|
|
|
|
if parsedConfig.ObjectLockEnabled != Enabled {
|
|
return fmt.Errorf("only 'Enabled' value is allowed to ObjectLockEnabled element")
|
|
}
|
|
|
|
*config = Config(parsedConfig)
|
|
return nil
|
|
}
|
|
|
|
// ToRetention - convert to Retention type.
|
|
func (config *Config) ToRetention() Retention {
|
|
r := Retention{
|
|
LockEnabled: config.ObjectLockEnabled == Enabled,
|
|
}
|
|
if config.Rule != nil {
|
|
r.Mode = config.Rule.DefaultRetention.Mode
|
|
|
|
t, err := UTCNowNTP()
|
|
if err != nil {
|
|
logger.LogIf(context.Background(), err)
|
|
// Do not change any configuration
|
|
// upon NTP failure.
|
|
return r
|
|
}
|
|
|
|
if config.Rule.DefaultRetention.Days != nil {
|
|
r.Validity = t.AddDate(0, 0, int(*config.Rule.DefaultRetention.Days)).Sub(t)
|
|
} else {
|
|
r.Validity = t.AddDate(int(*config.Rule.DefaultRetention.Years), 0, 0).Sub(t)
|
|
}
|
|
}
|
|
|
|
return r
|
|
}
|
|
|
|
// Maximum 4KiB size per object lock config.
|
|
const maxObjectLockConfigSize = 1 << 12
|
|
|
|
// ParseObjectLockConfig parses ObjectLockConfig from xml
|
|
func ParseObjectLockConfig(reader io.Reader) (*Config, error) {
|
|
config := Config{}
|
|
if err := xml.NewDecoder(io.LimitReader(reader, maxObjectLockConfigSize)).Decode(&config); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &config, nil
|
|
}
|
|
|
|
// NewObjectLockConfig returns a initialized lock.Config struct
|
|
func NewObjectLockConfig() *Config {
|
|
return &Config{
|
|
ObjectLockEnabled: Enabled,
|
|
}
|
|
}
|
|
|
|
// RetentionDate is a embedded type containing time.Time to unmarshal
|
|
// Date in Retention
|
|
type RetentionDate struct {
|
|
time.Time
|
|
}
|
|
|
|
// UnmarshalXML parses date from Retention and validates date format
|
|
func (rDate *RetentionDate) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
|
|
var dateStr string
|
|
err := d.DecodeElement(&dateStr, &startElement)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// While AWS documentation mentions that the date specified
|
|
// must be present in ISO 8601 format, in reality they allow
|
|
// users to provide RFC 3339 compliant dates.
|
|
retDate, err := amztime.ISO8601Parse(dateStr)
|
|
if err != nil {
|
|
return ErrInvalidRetentionDate
|
|
}
|
|
|
|
*rDate = RetentionDate{retDate}
|
|
return nil
|
|
}
|
|
|
|
// MarshalXML encodes expiration date if it is non-zero and encodes
|
|
// empty string otherwise
|
|
func (rDate RetentionDate) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
|
|
if rDate.IsZero() {
|
|
return nil
|
|
}
|
|
return e.EncodeElement(amztime.ISO8601Format(rDate.Time), startElement)
|
|
}
|
|
|
|
// ObjectRetention specified in
|
|
// https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectRetention.html
|
|
type ObjectRetention struct {
|
|
XMLNS string `xml:"xmlns,attr,omitempty"`
|
|
XMLName xml.Name `xml:"Retention"`
|
|
Mode RetMode `xml:"Mode,omitempty"`
|
|
RetainUntilDate RetentionDate `xml:"RetainUntilDate,omitempty"`
|
|
}
|
|
|
|
// Maximum 4KiB size per object retention config.
|
|
const maxObjectRetentionSize = 1 << 12
|
|
|
|
// ParseObjectRetention constructs ObjectRetention struct from xml input
|
|
func ParseObjectRetention(reader io.Reader) (*ObjectRetention, error) {
|
|
ret := ObjectRetention{}
|
|
if err := xml.NewDecoder(io.LimitReader(reader, maxObjectRetentionSize)).Decode(&ret); err != nil {
|
|
return nil, err
|
|
}
|
|
if ret.Mode != "" && !ret.Mode.Valid() {
|
|
return &ret, ErrUnknownWORMModeDirective
|
|
}
|
|
|
|
if ret.Mode.Valid() && ret.RetainUntilDate.IsZero() {
|
|
return &ret, ErrMalformedXML
|
|
}
|
|
|
|
if !ret.Mode.Valid() && !ret.RetainUntilDate.IsZero() {
|
|
return &ret, ErrMalformedXML
|
|
}
|
|
|
|
t, err := UTCNowNTP()
|
|
if err != nil {
|
|
logger.LogIf(context.Background(), err)
|
|
return &ret, ErrPastObjectLockRetainDate
|
|
}
|
|
|
|
if !ret.RetainUntilDate.IsZero() && ret.RetainUntilDate.Before(t) {
|
|
return &ret, ErrPastObjectLockRetainDate
|
|
}
|
|
|
|
return &ret, nil
|
|
}
|
|
|
|
// IsObjectLockRetentionRequested returns true if object lock retention headers are set.
|
|
func IsObjectLockRetentionRequested(h http.Header) bool {
|
|
if _, ok := h[AmzObjectLockMode]; ok {
|
|
return true
|
|
}
|
|
if _, ok := h[AmzObjectLockRetainUntilDate]; ok {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// IsObjectLockLegalHoldRequested returns true if object lock legal hold header is set.
|
|
func IsObjectLockLegalHoldRequested(h http.Header) bool {
|
|
_, ok := h[AmzObjectLockLegalHold]
|
|
return ok
|
|
}
|
|
|
|
// IsObjectLockGovernanceBypassSet returns true if object lock governance bypass header is set.
|
|
func IsObjectLockGovernanceBypassSet(h http.Header) bool {
|
|
return strings.EqualFold(h.Get(AmzObjectLockBypassRetGovernance), "true")
|
|
}
|
|
|
|
// IsObjectLockRequested returns true if legal hold or object lock retention headers are requested.
|
|
func IsObjectLockRequested(h http.Header) bool {
|
|
return IsObjectLockLegalHoldRequested(h) || IsObjectLockRetentionRequested(h)
|
|
}
|
|
|
|
// ParseObjectLockRetentionHeaders parses http headers to extract retention mode and retention date
|
|
func ParseObjectLockRetentionHeaders(h http.Header) (rmode RetMode, r RetentionDate, err error) {
|
|
retMode := h.Get(AmzObjectLockMode)
|
|
dateStr := h.Get(AmzObjectLockRetainUntilDate)
|
|
if len(retMode) == 0 || len(dateStr) == 0 {
|
|
return rmode, r, ErrObjectLockInvalidHeaders
|
|
}
|
|
|
|
rmode = parseRetMode(retMode)
|
|
if !rmode.Valid() {
|
|
return rmode, r, ErrUnknownWORMModeDirective
|
|
}
|
|
|
|
var retDate time.Time
|
|
// While AWS documentation mentions that the date specified
|
|
// must be present in ISO 8601 format, in reality they allow
|
|
// users to provide RFC 3339 compliant dates.
|
|
retDate, err = amztime.ISO8601Parse(dateStr)
|
|
if err != nil {
|
|
return rmode, r, ErrInvalidRetentionDate
|
|
}
|
|
_, replReq := h[textproto.CanonicalMIMEHeaderKey(xhttp.MinIOSourceReplicationRequest)]
|
|
|
|
t, err := UTCNowNTP()
|
|
if err != nil {
|
|
logger.LogIf(context.Background(), err)
|
|
return rmode, r, ErrPastObjectLockRetainDate
|
|
}
|
|
|
|
if retDate.Before(t) && !replReq {
|
|
return rmode, r, ErrPastObjectLockRetainDate
|
|
}
|
|
|
|
return rmode, RetentionDate{retDate}, nil
|
|
}
|
|
|
|
// GetObjectRetentionMeta constructs ObjectRetention from metadata
|
|
func GetObjectRetentionMeta(meta map[string]string) ObjectRetention {
|
|
var mode RetMode
|
|
var retainTill RetentionDate
|
|
|
|
var modeStr, tillStr string
|
|
ok := false
|
|
|
|
modeStr, ok = meta[strings.ToLower(AmzObjectLockMode)]
|
|
if !ok {
|
|
modeStr, ok = meta[AmzObjectLockMode]
|
|
}
|
|
if ok {
|
|
mode = parseRetMode(modeStr)
|
|
} else {
|
|
return ObjectRetention{}
|
|
}
|
|
|
|
tillStr, ok = meta[strings.ToLower(AmzObjectLockRetainUntilDate)]
|
|
if !ok {
|
|
tillStr, ok = meta[AmzObjectLockRetainUntilDate]
|
|
}
|
|
if ok {
|
|
if t, e := amztime.ISO8601Parse(tillStr); e == nil {
|
|
retainTill = RetentionDate{t.UTC()}
|
|
}
|
|
}
|
|
return ObjectRetention{XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/", Mode: mode, RetainUntilDate: retainTill}
|
|
}
|
|
|
|
// GetObjectLegalHoldMeta constructs ObjectLegalHold from metadata
|
|
func GetObjectLegalHoldMeta(meta map[string]string) ObjectLegalHold {
|
|
holdStr, ok := meta[strings.ToLower(AmzObjectLockLegalHold)]
|
|
if !ok {
|
|
holdStr, ok = meta[AmzObjectLockLegalHold]
|
|
}
|
|
if ok {
|
|
return ObjectLegalHold{XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/", Status: parseLegalHoldStatus(holdStr)}
|
|
}
|
|
return ObjectLegalHold{}
|
|
}
|
|
|
|
// ParseObjectLockLegalHoldHeaders parses request headers to construct ObjectLegalHold
|
|
func ParseObjectLockLegalHoldHeaders(h http.Header) (lhold ObjectLegalHold, err error) {
|
|
holdStatus, ok := h[AmzObjectLockLegalHold]
|
|
if ok {
|
|
lh := parseLegalHoldStatus(holdStatus[0])
|
|
if !lh.Valid() {
|
|
return lhold, ErrUnknownWORMModeDirective
|
|
}
|
|
lhold = ObjectLegalHold{XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/", Status: lh}
|
|
}
|
|
return lhold, nil
|
|
}
|
|
|
|
// ObjectLegalHold specified in
|
|
// https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectLegalHold.html
|
|
type ObjectLegalHold struct {
|
|
XMLNS string `xml:"xmlns,attr,omitempty"`
|
|
XMLName xml.Name `xml:"LegalHold"`
|
|
Status LegalHoldStatus `xml:"Status,omitempty"`
|
|
}
|
|
|
|
// UnmarshalXML - decodes XML data.
|
|
func (l *ObjectLegalHold) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
|
|
switch start.Name.Local {
|
|
case "LegalHold", "ObjectLockLegalHold":
|
|
default:
|
|
return xml.UnmarshalError(fmt.Sprintf("expected element type <LegalHold>/<ObjectLockLegalHold> but have <%s>",
|
|
start.Name.Local))
|
|
}
|
|
for {
|
|
// Read tokens from the XML document in a stream.
|
|
t, err := d.Token()
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
return err
|
|
}
|
|
|
|
if se, ok := t.(xml.StartElement); ok {
|
|
switch se.Name.Local {
|
|
case "Status":
|
|
var st LegalHoldStatus
|
|
if err = d.DecodeElement(&st, &se); err != nil {
|
|
return err
|
|
}
|
|
l.Status = st
|
|
default:
|
|
return xml.UnmarshalError(fmt.Sprintf("expected element type <Status> but have <%s>", se.Name.Local))
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// IsEmpty returns true if struct is empty
|
|
func (l *ObjectLegalHold) IsEmpty() bool {
|
|
return !l.Status.Valid()
|
|
}
|
|
|
|
// ParseObjectLegalHold decodes the XML into ObjectLegalHold
|
|
func ParseObjectLegalHold(reader io.Reader) (hold *ObjectLegalHold, err error) {
|
|
buf, err := io.ReadAll(io.LimitReader(reader, maxObjectLockConfigSize))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
hold = &ObjectLegalHold{}
|
|
if err = xml.NewDecoder(bytes.NewReader(buf)).Decode(hold); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if !hold.Status.Valid() {
|
|
return nil, ErrMalformedXML
|
|
}
|
|
return
|
|
}
|
|
|
|
// FilterObjectLockMetadata filters object lock metadata if s3:GetObjectRetention permission is denied or if isCopy flag set.
|
|
func FilterObjectLockMetadata(metadata map[string]string, filterRetention, filterLegalHold bool) 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)
|
|
}
|
|
legalHold := GetObjectLegalHoldMeta(metadata)
|
|
if !legalHold.Status.Valid() || filterLegalHold {
|
|
delKey(AmzObjectLockLegalHold)
|
|
}
|
|
|
|
ret := GetObjectRetentionMeta(metadata)
|
|
if !ret.Mode.Valid() || filterRetention {
|
|
delKey(AmzObjectLockMode)
|
|
delKey(AmzObjectLockRetainUntilDate)
|
|
return dst
|
|
}
|
|
return dst
|
|
}
|