fix: support object-remaining-retention-days policy condition (#9259)

This PR also tries to simplify the approach taken in
object-locking implementation by preferential treatment
given towards full validation.

This in-turn has fixed couple of bugs related to
how policy should have been honored when ByPassGovernance
is provided.

Simplifies code a bit, but also duplicates code intentionally
for clarity due to complex nature of object locking
implementation.

buildscripts/gateway-tests.sh

@@ -46,7 +46,10 @@ function main()
     gw_pid="$(start_minio_gateway_s3)"
 
     SERVER_ENDPOINT=127.0.0.1:24240 ENABLE_HTTPS=0 ACCESS_KEY=minio \
-                   SECRET_KEY=minio123 MINT_MODE="full" /mint/entrypoint.sh
+                   SECRET_KEY=minio123 MINT_MODE="full" /mint/entrypoint.sh \
+                   aws-sdk-go aws-sdk-java aws-sdk-php aws-sdk-ruby awscli \
+                   healthcheck mc minio-dotnet minio-java minio-js \
+                   minio-py s3cmd s3select security
     rv=$?
 
     kill "$sr_pid"

cmd/auth-handler.go

@@ -26,12 +26,15 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"strconv"
 	"strings"
+	"time"
 
 	xhttp "github.com/minio/minio/cmd/http"
 	xjwt "github.com/minio/minio/cmd/jwt"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/auth"
+	objectlock "github.com/minio/minio/pkg/bucket/object/lock"
 	"github.com/minio/minio/pkg/bucket/policy"
 	"github.com/minio/minio/pkg/hash"
 	iampolicy "github.com/minio/minio/pkg/iam/policy"
@@ -464,6 +467,106 @@ func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrSignatureVersionNotSupported), r.URL, guessIsBrowserReq(r))
 }
 
+func validateSignature(atype authType, r *http.Request) (auth.Credentials, bool, map[string]interface{}, APIErrorCode) {
+	var cred auth.Credentials
+	var owner bool
+	var s3Err APIErrorCode
+	switch atype {
+	case authTypeUnknown, authTypeStreamingSigned:
+		return cred, owner, nil, ErrSignatureVersionNotSupported
+	case authTypeSignedV2, authTypePresignedV2:
+		if s3Err = isReqAuthenticatedV2(r); s3Err != ErrNone {
+			return cred, owner, nil, s3Err
+		}
+		cred, owner, s3Err = getReqAccessKeyV2(r)
+	case authTypePresigned, authTypeSigned:
+		region := globalServerRegion
+		if s3Err = isReqAuthenticated(GlobalContext, r, region, serviceS3); s3Err != ErrNone {
+			return cred, owner, nil, s3Err
+		}
+		cred, owner, s3Err = getReqAccessKeyV4(r, region, serviceS3)
+	}
+	if s3Err != ErrNone {
+		return cred, owner, nil, s3Err
+	}
+
+	claims, s3Err := checkClaimsFromToken(r, cred)
+	if s3Err != ErrNone {
+		return cred, owner, nil, s3Err
+	}
+
+	return cred, owner, claims, ErrNone
+}
+
+func isPutRetentionAllowed(bucketName, objectName string, retDays int, retDate time.Time, retMode objectlock.RetMode, byPassSet bool, r *http.Request, cred auth.Credentials, owner bool, claims map[string]interface{}) (s3Err APIErrorCode) {
+	var retSet bool
+	if cred.AccessKey == "" {
+		conditions := getConditionValues(r, "", "", nil)
+		conditions["object-lock-mode"] = []string{string(retMode)}
+		conditions["object-lock-retain-until-date"] = []string{retDate.Format(time.RFC3339)}
+		if retDays > 0 {
+			conditions["object-lock-remaining-retention-days"] = []string{strconv.Itoa(retDays)}
+		}
+		if retMode == objectlock.RetGovernance && byPassSet {
+			byPassSet = globalPolicySys.IsAllowed(policy.Args{
+				AccountName:     cred.AccessKey,
+				Action:          policy.Action(policy.BypassGovernanceRetentionAction),
+				BucketName:      bucketName,
+				ConditionValues: conditions,
+				IsOwner:         false,
+				ObjectName:      objectName,
+			})
+		}
+		if globalPolicySys.IsAllowed(policy.Args{
+			AccountName:     cred.AccessKey,
+			Action:          policy.Action(policy.PutObjectRetentionAction),
+			BucketName:      bucketName,
+			ConditionValues: conditions,
+			IsOwner:         false,
+			ObjectName:      objectName,
+		}) {
+			retSet = true
+		}
+		if byPassSet || retSet {
+			return ErrNone
+		}
+		return ErrAccessDenied
+	}
+
+	conditions := getConditionValues(r, "", cred.AccessKey, claims)
+	conditions["object-lock-mode"] = []string{string(retMode)}
+	conditions["object-lock-retain-until-date"] = []string{retDate.Format(time.RFC3339)}
+	if retDays > 0 {
+		conditions["object-lock-remaining-retention-days"] = []string{strconv.Itoa(retDays)}
+	}
+	if retMode == objectlock.RetGovernance && byPassSet {
+		byPassSet = globalIAMSys.IsAllowed(iampolicy.Args{
+			AccountName:     cred.AccessKey,
+			Action:          policy.BypassGovernanceRetentionAction,
+			BucketName:      bucketName,
+			ObjectName:      objectName,
+			ConditionValues: conditions,
+			IsOwner:         owner,
+			Claims:          claims,
+		})
+	}
+	if globalIAMSys.IsAllowed(iampolicy.Args{
+		AccountName:     cred.AccessKey,
+		Action:          policy.PutObjectRetentionAction,
+		BucketName:      bucketName,
+		ConditionValues: conditions,
+		ObjectName:      objectName,
+		IsOwner:         owner,
+		Claims:          claims,
+	}) {
+		retSet = true
+	}
+	if byPassSet || retSet {
+		return ErrNone
+	}
+	return ErrAccessDenied
+}
+
 // isPutActionAllowed - check if PUT operation is allowed on the resource, this
 // call verifies bucket policies and IAM policies, supports multi user
 // checks etc.

cmd/bucket-handlers.go

@@ -399,11 +399,14 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 			}
 			continue
 		}
-		govBypassPerms := checkRequestAuthType(ctx, r, policy.BypassGovernanceRetentionAction, bucket, object.ObjectName)
+
-		if _, err := enforceRetentionBypassForDelete(ctx, r, bucket, object.ObjectName, getObjectInfoFn, govBypassPerms); err != ErrNone {
+		if _, ok := globalBucketObjectLockConfig.Get(bucket); ok {
-			dErrs[index] = err
+			if err := enforceRetentionBypassForDelete(ctx, r, bucket, object.ObjectName, getObjectInfoFn); err != ErrNone {
-			continue
+				dErrs[index] = err
+				continue
+			}
 		}
+
 		// Avoid duplicate objects, we use map to filter them out.
 		if _, ok := objectsToDelete[object.ObjectName]; !ok {
 			objectsToDelete[object.ObjectName] = index

cmd/disk-cache.go

@@ -239,7 +239,7 @@ func (c *cacheObjects) GetObjectNInfo(ctx context.Context, bucket, object string
 	// skip cache for objects with locks
 	objRetention := objectlock.GetObjectRetentionMeta(objInfo.UserDefined)
 	legalHold := objectlock.GetObjectLegalHoldMeta(objInfo.UserDefined)
-	if objRetention.Mode != objectlock.Invalid || legalHold.Status != "" {
+	if objRetention.Mode.Valid() || legalHold.Status.Valid() {
 		c.cacheStats.incMiss()
 		return c.GetObjectNInfoFn(ctx, bucket, object, rs, h, lockType, opts)
 	}
@@ -614,7 +614,7 @@ func (c *cacheObjects) PutObject(ctx context.Context, bucket, object string, r *
 	// skip cache for objects with locks
 	objRetention := objectlock.GetObjectRetentionMeta(opts.UserDefined)
 	legalHold := objectlock.GetObjectLegalHoldMeta(opts.UserDefined)
-	if objRetention.Mode != objectlock.Invalid || legalHold.Status != "" {
+	if objRetention.Mode.Valid() || legalHold.Status.Valid() {
 		dcache.Delete(ctx, bucket, object)
 		return putObjectFn(ctx, bucket, object, r, opts)
 	}

cmd/object-handlers.go

@@ -1017,27 +1017,29 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
 		srcInfo.UserDefined[xhttp.AmzObjectTagging] = tags
 	}
 
+	srcInfo.UserDefined = objectlock.FilterObjectLockMetadata(srcInfo.UserDefined, true, true)
+	retPerms := isPutActionAllowed(getRequestAuthType(r), dstBucket, dstObject, r, iampolicy.PutObjectRetentionAction)
+	holdPerms := isPutActionAllowed(getRequestAuthType(r), dstBucket, dstObject, r, iampolicy.PutObjectLegalHoldAction)
+
 	getObjectInfo := objectAPI.GetObjectInfo
 	if api.CacheAPI() != nil {
 		getObjectInfo = api.CacheAPI().GetObjectInfo
 	}
-	srcInfo.UserDefined = objectlock.FilterObjectLockMetadata(srcInfo.UserDefined, true, true)
-	retPerms := isPutActionAllowed(getRequestAuthType(r), dstBucket, dstObject, r, iampolicy.PutObjectRetentionAction)
-	holdPerms := isPutActionAllowed(getRequestAuthType(r), dstBucket, dstObject, r, iampolicy.PutObjectLegalHoldAction)
 
 	// apply default bucket configuration/governance headers for dest side.
 	retentionMode, retentionDate, legalHold, s3Err := checkPutObjectLockAllowed(ctx, r, dstBucket, dstObject, getObjectInfo, retPerms, holdPerms)
-	if s3Err == ErrNone && retentionMode != "" {
+	if s3Err == ErrNone && retentionMode.Valid() {
 		srcInfo.UserDefined[xhttp.AmzObjectLockMode] = string(retentionMode)
 		srcInfo.UserDefined[xhttp.AmzObjectLockRetainUntilDate] = retentionDate.UTC().Format(time.RFC3339)
 	}
-	if s3Err == ErrNone && legalHold.Status != "" {
+	if s3Err == ErrNone && legalHold.Status.Valid() {
 		srcInfo.UserDefined[xhttp.AmzObjectLockLegalHold] = string(legalHold.Status)
 	}
 	if s3Err != ErrNone {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
 		return
 	}
+
 	// Store the preserved compression metadata.
 	for k, v := range compressMetadata {
 		srcInfo.UserDefined[k] = v
@@ -1327,20 +1329,25 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 		writeErrorResponseHeadersOnly(w, toAPIError(ctx, err))
 		return
 	}
-	getObjectInfo := objectAPI.GetObjectInfo
+
 	if api.CacheAPI() != nil {
-		getObjectInfo = api.CacheAPI().GetObjectInfo
 		putObject = api.CacheAPI().PutObject
 	}
-	retPerms := isPutActionAllowed(rAuthType, bucket, object, r, iampolicy.PutObjectRetentionAction)
+
+	retPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectRetentionAction)
 	holdPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectLegalHoldAction)
 
+	getObjectInfo := objectAPI.GetObjectInfo
+	if api.CacheAPI() != nil {
+		getObjectInfo = api.CacheAPI().GetObjectInfo
+	}
+
 	retentionMode, retentionDate, legalHold, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, getObjectInfo, retPerms, holdPerms)
-	if s3Err == ErrNone && retentionMode != "" {
+	if s3Err == ErrNone && retentionMode.Valid() {
 		metadata[strings.ToLower(xhttp.AmzObjectLockMode)] = string(retentionMode)
 		metadata[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = retentionDate.UTC().Format(time.RFC3339)
 	}
-	if s3Err == ErrNone && legalHold.Status != "" {
+	if s3Err == ErrNone && legalHold.Status.Valid() {
 		metadata[strings.ToLower(xhttp.AmzObjectLockLegalHold)] = string(legalHold.Status)
 	}
 	if s3Err != ErrNone {
@@ -1471,6 +1478,14 @@ func (api objectAPIHandlers) NewMultipartUploadHandler(w http.ResponseWriter, r
 		return
 	}
 
+	// Deny if WORM is enabled
+	if globalWORMEnabled {
+		if _, err := objectAPI.GetObjectInfo(ctx, bucket, object, opts); err == nil {
+			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL, guessIsBrowserReq(r))
+			return
+		}
+	}
+
 	// Validate storage class metadata if present
 	if sc := r.Header.Get(xhttp.AmzStorageClass); sc != "" {
 		if !storageclass.IsValid(sc) {
@@ -1499,21 +1514,28 @@ func (api objectAPIHandlers) NewMultipartUploadHandler(w http.ResponseWriter, r
 		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
 		return
 	}
+
 	retPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectRetentionAction)
 	holdPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectLegalHoldAction)
 
-	retentionMode, retentionDate, legalHold, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, objectAPI.GetObjectInfo, retPerms, holdPerms)
+	getObjectInfo := objectAPI.GetObjectInfo
-	if s3Err == ErrNone && retentionMode != "" {
+	if api.CacheAPI() != nil {
+		getObjectInfo = api.CacheAPI().GetObjectInfo
+	}
+
+	retentionMode, retentionDate, legalHold, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, getObjectInfo, retPerms, holdPerms)
+	if s3Err == ErrNone && retentionMode.Valid() {
 		metadata[strings.ToLower(xhttp.AmzObjectLockMode)] = string(retentionMode)
 		metadata[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = retentionDate.UTC().Format(time.RFC3339)
 	}
-	if s3Err == ErrNone && legalHold.Status != "" {
+	if s3Err == ErrNone && legalHold.Status.Valid() {
 		metadata[strings.ToLower(xhttp.AmzObjectLockLegalHold)] = string(legalHold.Status)
 	}
 	if s3Err != ErrNone {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
 		return
 	}
+
 	// We need to preserve the encryption headers set in EncryptRequest,
 	// so we do not want to override them, copy them instead.
 	for k, v := range encMetadata {
@@ -2339,22 +2361,6 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 		return
 	}
 
-	// Reject retention or governance headers if set, CompleteMultipartUpload spec
-	// does not use these headers, and should not be passed down to checkPutObjectLockAllowed
-	if objectlock.IsObjectLockRequested(r.Header) || objectlock.IsObjectLockGovernanceBypassSet(r.Header) {
-		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL, guessIsBrowserReq(r))
-		return
-	}
-
-	// Enforce object lock governance in case a competing upload finalized first.
-	retPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectRetentionAction)
-	holdPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectLegalHoldAction)
-
-	if _, _, _, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, objectAPI.GetObjectInfo, retPerms, holdPerms); s3Err != ErrNone {
-		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
-		return
-	}
-
 	// Get upload id.
 	uploadID, _, _, _, s3Error := getObjectResources(r.URL.Query())
 	if s3Error != ErrNone {
@@ -2375,6 +2381,36 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidPartOrder), r.URL, guessIsBrowserReq(r))
 		return
 	}
+
+	// Reject retention or governance headers if set, CompleteMultipartUpload spec
+	// does not use these headers, and should not be passed down to checkPutObjectLockAllowed
+	if objectlock.IsObjectLockRequested(r.Header) || objectlock.IsObjectLockGovernanceBypassSet(r.Header) {
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL, guessIsBrowserReq(r))
+		return
+	}
+
+	// Deny if global WORM is enabled
+	if globalWORMEnabled {
+		opts, err := getOpts(ctx, r, bucket, object)
+		if err != nil {
+			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
+			return
+		}
+		if _, err := objectAPI.GetObjectInfo(ctx, bucket, object, opts); err == nil {
+			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL, guessIsBrowserReq(r))
+			return
+		}
+	}
+
+	// Enforce object lock governance in case a competing upload finalized first.
+	retPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectRetentionAction)
+	holdPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, iampolicy.PutObjectLegalHoldAction)
+
+	if _, _, _, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, objectAPI.GetObjectInfo, retPerms, holdPerms); s3Err != ErrNone {
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
+		return
+	}
+
 	var objectEncryptionKey []byte
 	var opts ObjectOptions
 	var isEncrypted, ssec bool
@@ -2546,12 +2582,6 @@ func (api objectAPIHandlers) DeleteObjectHandler(w http.ResponseWriter, r *http.
 		getObjectInfo = api.CacheAPI().GetObjectInfo
 	}
 
-	govBypassPerms := checkRequestAuthType(ctx, r, policy.BypassGovernanceRetentionAction, bucket, object)
-	if _, err := enforceRetentionBypassForDelete(ctx, r, bucket, object, getObjectInfo, govBypassPerms); err != ErrNone {
-		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(err), r.URL, guessIsBrowserReq(r))
-		return
-	}
-
 	if globalDNSConfig != nil {
 		_, err := globalDNSConfig.Get(bucket)
 		if err != nil {
@@ -2560,16 +2590,41 @@ func (api objectAPIHandlers) DeleteObjectHandler(w http.ResponseWriter, r *http.
 		}
 	}
 
-	// http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectDELETE.html
+	// Deny if global WORM is enabled
-	if err := deleteObject(ctx, objectAPI, api.CacheAPI(), bucket, object, r); err != nil {
+	if globalWORMEnabled {
-		switch err.(type) {
+		opts, err := getOpts(ctx, r, bucket, object)
-		case BucketNotFound:
+		if err != nil {
-			// When bucket doesn't exist specially handle it.
 			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
 			return
 		}
-		// Ignore delete object errors while replying to client, since we are suppposed to reply only 204.
+		if _, err := objectAPI.GetObjectInfo(ctx, bucket, object, opts); err == nil {
+			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMethodNotAllowed), r.URL, guessIsBrowserReq(r))
+			return
+		}
 	}
+
+	apiErr := ErrNone
+	if _, ok := globalBucketObjectLockConfig.Get(bucket); ok {
+		apiErr = enforceRetentionBypassForDelete(ctx, r, bucket, object, getObjectInfo)
+		if apiErr != ErrNone && apiErr != ErrNoSuchKey {
+			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(apiErr), r.URL, guessIsBrowserReq(r))
+			return
+		}
+	}
+
+	if apiErr == ErrNone {
+		// http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectDELETE.html
+		if err := deleteObject(ctx, objectAPI, api.CacheAPI(), bucket, object, r); err != nil {
+			switch err.(type) {
+			case BucketNotFound:
+				// When bucket doesn't exist specially handle it.
+				writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
+				return
+			}
+			// Ignore delete object errors while replying to client, since we are suppposed to reply only 204.
+		}
+	}
+
 	writeSuccessNoContent(w)
 }
 
@@ -2695,6 +2750,11 @@ func (api objectAPIHandlers) GetObjectLegalHoldHandler(w http.ResponseWriter, r
 		getObjectInfo = api.CacheAPI().GetObjectInfo
 	}
 
+	if _, ok := globalBucketObjectLockConfig.Get(bucket); !ok {
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidBucketObjectLockConfiguration), r.URL, guessIsBrowserReq(r))
+		return
+	}
+
 	opts, err := getOpts(ctx, r, bucket, object)
 	if err != nil {
 		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
@@ -2707,15 +2767,12 @@ func (api objectAPIHandlers) GetObjectLegalHoldHandler(w http.ResponseWriter, r
 		return
 	}
 
-	if _, ok := globalBucketObjectLockConfig.Get(bucket); !ok {
-		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidBucketObjectLockConfiguration), r.URL, guessIsBrowserReq(r))
-		return
-	}
 	legalHold := objectlock.GetObjectLegalHoldMeta(objInfo.UserDefined)
 	if legalHold.IsEmpty() {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNoSuchObjectLockConfiguration), r.URL, guessIsBrowserReq(r))
 		return
 	}
+
 	writeSuccessResponseXML(w, encodeResponse(legalHold))
 	// Notify object legal hold accessed via a GET request.
 	sendEvent(eventArgs{
@@ -2753,8 +2810,9 @@ func (api objectAPIHandlers) PutObjectRetentionHandler(w http.ResponseWriter, r
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL, guessIsBrowserReq(r))
 		return
 	}
-	// Check permissions to perform this governance operation
+
-	if s3Err := checkRequestAuthType(ctx, r, policy.PutObjectRetentionAction, bucket, object); s3Err != ErrNone {
+	cred, owner, claims, s3Err := validateSignature(getRequestAuthType(r), r)
+	if s3Err != ErrNone {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
 		return
 	}
@@ -2763,11 +2821,17 @@ func (api objectAPIHandlers) PutObjectRetentionHandler(w http.ResponseWriter, r
 		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
 		return
 	}
+
 	if !hasContentMD5(r.Header) {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingContentMD5), r.URL, guessIsBrowserReq(r))
 		return
 	}
 
+	if globalWORMEnabled {
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrObjectLocked), r.URL, guessIsBrowserReq(r))
+		return
+	}
+
 	if _, ok := globalBucketObjectLockConfig.Get(bucket); !ok {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidBucketObjectLockConfiguration), r.URL, guessIsBrowserReq(r))
 		return
@@ -2780,13 +2844,13 @@ func (api objectAPIHandlers) PutObjectRetentionHandler(w http.ResponseWriter, r
 		writeErrorResponse(ctx, w, apiErr, r.URL, guessIsBrowserReq(r))
 		return
 	}
+
 	getObjectInfo := objectAPI.GetObjectInfo
 	if api.CacheAPI() != nil {
 		getObjectInfo = api.CacheAPI().GetObjectInfo
 	}
 
-	govBypassPerms := isPutActionAllowed(getRequestAuthType(r), bucket, object, r, policy.BypassGovernanceRetentionAction)
+	objInfo, s3Err := enforceRetentionBypassForPut(ctx, r, bucket, object, getObjectInfo, objRetention, cred, owner, claims)
-	objInfo, s3Err := enforceRetentionBypassForPut(ctx, r, bucket, object, getObjectInfo, govBypassPerms, objRetention)
 	if s3Err != ErrNone {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
 		return
@@ -2794,7 +2858,7 @@ func (api objectAPIHandlers) PutObjectRetentionHandler(w http.ResponseWriter, r
 
 	objInfo.UserDefined[strings.ToLower(xhttp.AmzObjectLockMode)] = string(objRetention.Mode)
 	objInfo.UserDefined[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = objRetention.RetainUntilDate.UTC().Format(time.RFC3339)
-	objInfo.metadataOnly = true
+	objInfo.metadataOnly = true // Perform only metadata updates.
 	if _, err = objectAPI.CopyObject(ctx, bucket, object, bucket, object, objInfo, ObjectOptions{}, ObjectOptions{}); err != nil {
 		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
 		return

cmd/object-lock.go

@@ -20,62 +20,164 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"math"
 	"net/http"
 	"path"
 
 	"github.com/minio/minio/cmd/logger"
+	"github.com/minio/minio/pkg/auth"
 	objectlock "github.com/minio/minio/pkg/bucket/object/lock"
+	"github.com/minio/minio/pkg/bucket/policy"
 )
 
+// Similar to enforceRetentionBypassForDelete but for WebUI
+func enforceRetentionBypassForDeleteWeb(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn) APIErrorCode {
+	opts, err := getOpts(ctx, r, bucket, object)
+	if err != nil {
+		return toAPIErrorCode(ctx, err)
+	}
+
+	oi, err := getObjectInfoFn(ctx, bucket, object, opts)
+	if err != nil {
+		return toAPIErrorCode(ctx, err)
+	}
+
+	lhold := objectlock.GetObjectLegalHoldMeta(oi.UserDefined)
+	if lhold.Status.Valid() && lhold.Status == objectlock.LegalHoldOn {
+		return ErrObjectLocked
+	}
+
+	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
+	if ret.Mode.Valid() {
+		switch ret.Mode {
+		case objectlock.RetCompliance:
+			// In compliance mode, a protected object version can't be overwritten
+			// or deleted by any user, including the root user in your AWS account.
+			// When an object is locked in compliance mode, its retention mode can't
+			// be changed, and its retention period can't be shortened. Compliance mode
+			// ensures that an object version can't be overwritten or deleted for the
+			// duration of the retention period.
+			t, err := objectlock.UTCNowNTP()
+			if err != nil {
+				logger.LogIf(ctx, err)
+				return ErrObjectLocked
+			}
+
+			if !ret.RetainUntilDate.Before(t) {
+				return ErrObjectLocked
+			}
+			return ErrNone
+		case objectlock.RetGovernance:
+			// In governance mode, users can't overwrite or delete an object
+			// version or alter its lock settings unless they have special
+			// permissions. With governance mode, you protect objects against
+			// being deleted by most users, but you can still grant some users
+			// permission to alter the retention settings or delete the object
+			// if necessary. You can also use governance mode to test retention-period
+			// settings before creating a compliance-mode retention period.
+			// To override or remove governance-mode retention settings, a
+			// user must have the s3:BypassGovernanceRetention permission
+			// and must explicitly include x-amz-bypass-governance-retention:true
+			// as a request header with any request that requires overriding
+			// governance mode.
+			byPassSet := objectlock.IsObjectLockGovernanceBypassSet(r.Header)
+			if !byPassSet {
+				t, err := objectlock.UTCNowNTP()
+				if err != nil {
+					logger.LogIf(ctx, err)
+					return ErrObjectLocked
+				}
+
+				if !ret.RetainUntilDate.Before(t) {
+					return ErrObjectLocked
+				}
+				return ErrNone
+			}
+		}
+	}
+	return ErrNone
+}
+
 // enforceRetentionBypassForDelete enforces whether an existing object under governance can be deleted
 // with governance bypass headers set in the request.
 // Objects under site wide WORM can never be overwritten.
 // For objects in "Governance" mode, overwrite is allowed if a) object retention date is past OR
 // governance bypass headers are set and user has governance bypass permissions.
 // Objects in "Compliance" mode can be overwritten only if retention date is past.
-func enforceRetentionBypassForDelete(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, govBypassPerm APIErrorCode) (oi ObjectInfo, s3Err APIErrorCode) {
+func enforceRetentionBypassForDelete(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn) APIErrorCode {
-	if globalWORMEnabled {
+	opts, err := getOpts(ctx, r, bucket, object)
-		return oi, ErrObjectLocked
-	}
-	var err error
-	var opts ObjectOptions
-	opts, err = getOpts(ctx, r, bucket, object)
 	if err != nil {
-		return oi, toAPIErrorCode(ctx, err)
+		return toAPIErrorCode(ctx, err)
 	}
-	oi, err = getObjectInfoFn(ctx, bucket, object, opts)
+
+	oi, err := getObjectInfoFn(ctx, bucket, object, opts)
 	if err != nil {
-		// ignore case where object no longer exists
+		return toAPIErrorCode(ctx, err)
-		if toAPIError(ctx, err).Code == "NoSuchKey" {
-			oi.UserDefined = map[string]string{}
-			return oi, ErrNone
-		}
-		return oi, toAPIErrorCode(ctx, err)
 	}
-	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
+
 	lhold := objectlock.GetObjectLegalHoldMeta(oi.UserDefined)
-	if lhold.Status == objectlock.ON {
+	if lhold.Status.Valid() && lhold.Status == objectlock.LegalHoldOn {
-		return oi, ErrObjectLocked
+		return ErrObjectLocked
-	}
-	// Here bucket does not support object lock
-	if ret.Mode == objectlock.Invalid {
-		return oi, ErrNone
 	}
-	if ret.Mode != objectlock.Compliance && ret.Mode != objectlock.Governance {
+
-		return oi, ErrUnknownWORMModeDirective
+	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
-	}
+	if ret.Mode.Valid() {
-	t, err := objectlock.UTCNowNTP()
+		switch ret.Mode {
-	if err != nil {
+		case objectlock.RetCompliance:
-		logger.LogIf(ctx, err)
+			// In compliance mode, a protected object version can't be overwritten
-		return oi, ErrObjectLocked
+			// or deleted by any user, including the root user in your AWS account.
-	}
+			// When an object is locked in compliance mode, its retention mode can't
-	if ret.RetainUntilDate.Before(t) {
+			// be changed, and its retention period can't be shortened. Compliance mode
-		return oi, ErrNone
+			// ensures that an object version can't be overwritten or deleted for the
-	}
+			// duration of the retention period.
-	if objectlock.IsObjectLockGovernanceBypassSet(r.Header) && ret.Mode == objectlock.Governance && govBypassPerm == ErrNone {
+			t, err := objectlock.UTCNowNTP()
-		return oi, ErrNone
+			if err != nil {
+				logger.LogIf(ctx, err)
+				return ErrObjectLocked
+			}
+
+			if !ret.RetainUntilDate.Before(t) {
+				return ErrObjectLocked
+			}
+			return ErrNone
+		case objectlock.RetGovernance:
+			// In governance mode, users can't overwrite or delete an object
+			// version or alter its lock settings unless they have special
+			// permissions. With governance mode, you protect objects against
+			// being deleted by most users, but you can still grant some users
+			// permission to alter the retention settings or delete the object
+			// if necessary. You can also use governance mode to test retention-period
+			// settings before creating a compliance-mode retention period.
+			// To override or remove governance-mode retention settings, a
+			// user must have the s3:BypassGovernanceRetention permission
+			// and must explicitly include x-amz-bypass-governance-retention:true
+			// as a request header with any request that requires overriding
+			// governance mode.
+			//
+			byPassSet := objectlock.IsObjectLockGovernanceBypassSet(r.Header)
+			if !byPassSet {
+				t, err := objectlock.UTCNowNTP()
+				if err != nil {
+					logger.LogIf(ctx, err)
+					return ErrObjectLocked
+				}
+
+				if !ret.RetainUntilDate.Before(t) {
+					return ErrObjectLocked
+				}
+				return ErrNone
+			}
+			// https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock-overview.html#object-lock-retention-modes
+			// If you try to delete objects protected by governance mode and have s3:BypassGovernanceRetention
+			// or s3:GetBucketObjectLockConfiguration permissions, the operation will succeed.
+			govBypassPerms1 := checkRequestAuthType(ctx, r, policy.BypassGovernanceRetentionAction, bucket, object)
+			govBypassPerms2 := checkRequestAuthType(ctx, r, policy.GetBucketObjectLockConfigurationAction, bucket, object)
+			if govBypassPerms1 != ErrNone && govBypassPerms2 != ErrNone {
+				return ErrAccessDenied
+			}
+		}
 	}
-	return oi, ErrObjectLocked
+	return ErrNone
 }
 
 // enforceRetentionBypassForPut enforces whether an existing object under governance can be overwritten
@@ -84,66 +186,68 @@ func enforceRetentionBypassForDelete(ctx context.Context, r *http.Request, bucke
 // For objects in "Governance" mode, overwrite is allowed if a) object retention date is past OR
 // governance bypass headers are set and user has governance bypass permissions.
 // Objects in compliance mode can be overwritten only if retention date is being extended. No mode change is permitted.
-func enforceRetentionBypassForPut(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, govBypassPerm APIErrorCode, objRetention *objectlock.ObjectRetention) (oi ObjectInfo, s3Err APIErrorCode) {
+func enforceRetentionBypassForPut(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, objRetention *objectlock.ObjectRetention, cred auth.Credentials, owner bool, claims map[string]interface{}) (ObjectInfo, APIErrorCode) {
-	if globalWORMEnabled {
+	byPassSet := objectlock.IsObjectLockGovernanceBypassSet(r.Header)
-		return oi, ErrObjectLocked
+	opts, err := getOpts(ctx, r, bucket, object)
-	}
-
-	var err error
-	var opts ObjectOptions
-	opts, err = getOpts(ctx, r, bucket, object)
 	if err != nil {
-		return oi, toAPIErrorCode(ctx, err)
+		return ObjectInfo{}, toAPIErrorCode(ctx, err)
 	}
-	oi, err = getObjectInfoFn(ctx, bucket, object, opts)
+
+	oi, err := getObjectInfoFn(ctx, bucket, object, opts)
 	if err != nil {
-		// ignore case where object no longer exists
-		if toAPIError(ctx, err).Code == "NoSuchKey" {
-			oi.UserDefined = map[string]string{}
-			return oi, ErrNone
-		}
 		return oi, toAPIErrorCode(ctx, err)
 	}
 
-	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
-	// no retention metadata on object
-	if ret.Mode == objectlock.Invalid {
-		if _, isWORMBucket := globalBucketObjectLockConfig.Get(bucket); !isWORMBucket {
-			return oi, ErrInvalidBucketObjectLockConfiguration
-		}
-		return oi, ErrNone
-	}
 	t, err := objectlock.UTCNowNTP()
 	if err != nil {
 		logger.LogIf(ctx, err)
 		return oi, ErrObjectLocked
 	}
 
-	if ret.Mode == objectlock.Compliance {
+	// Pass in relative days from current time, to additionally to verify "object-lock-remaining-retention-days" policy if any.
-		// Compliance retention mode cannot be changed and retention period cannot be shortened as per
+	days := int(math.Ceil(math.Abs(objRetention.RetainUntilDate.Sub(t).Hours()) / 24))
-		// https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock-overview.html#object-lock-retention-modes
+
-		if objRetention.Mode != objectlock.Compliance || objRetention.RetainUntilDate.Before(ret.RetainUntilDate.Time) {
+	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
-			return oi, ErrObjectLocked
+	if ret.Mode.Valid() {
-		}
+		// Retention has expired you may change whatever you like.
-		if objRetention.RetainUntilDate.Before(t) {
+		if ret.RetainUntilDate.Before(t) {
-			return oi, ErrInvalidRetentionDate
+			perm := isPutRetentionAllowed(bucket, object,
+				days, objRetention.RetainUntilDate.Time,
+				objRetention.Mode, byPassSet, r, cred,
+				owner, claims)
+			return oi, perm
 		}
-		return oi, ErrNone
-	}
 
-	if ret.Mode == objectlock.Governance {
+		switch ret.Mode {
-		if !objectlock.IsObjectLockGovernanceBypassSet(r.Header) {
+		case objectlock.RetGovernance:
-			if objRetention.RetainUntilDate.Before(t) {
+			govPerm := isPutRetentionAllowed(bucket, object, days,
-				return oi, ErrInvalidRetentionDate
+				objRetention.RetainUntilDate.Time, objRetention.Mode,
+				byPassSet, r, cred, owner, claims)
+			// Governance mode retention period cannot be shortened, if x-amz-bypass-governance is not set.
+			if !byPassSet {
+				if objRetention.Mode != objectlock.RetGovernance || objRetention.RetainUntilDate.Before((ret.RetainUntilDate.Time)) {
+					return oi, ErrObjectLocked
+				}
 			}
-			if objRetention.RetainUntilDate.Before((ret.RetainUntilDate.Time)) {
+			return oi, govPerm
+		case objectlock.RetCompliance:
+			// Compliance retention mode cannot be changed or shortened.
+			// https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock-overview.html#object-lock-retention-modes
+			if objRetention.Mode != objectlock.RetCompliance || objRetention.RetainUntilDate.Before((ret.RetainUntilDate.Time)) {
 				return oi, ErrObjectLocked
 			}
-			return oi, ErrNone
+			compliancePerm := isPutRetentionAllowed(bucket, object,
+				days, objRetention.RetainUntilDate.Time, objRetention.Mode,
+				false, r, cred, owner, claims)
+			return oi, compliancePerm
 		}
-		return oi, govBypassPerm
+		return oi, ErrNone
-	}
+	} // No pre-existing retention metadata present.
-	return oi, ErrNone
+
+	perm := isPutRetentionAllowed(bucket, object,
+		days, objRetention.RetainUntilDate.Time,
+		objRetention.Mode, byPassSet, r, cred, owner, claims)
+	return oi, perm
 }
 
 // checkPutObjectLockAllowed enforces object retention policy and legal hold policy
@@ -156,16 +260,23 @@ func enforceRetentionBypassForPut(ctx context.Context, r *http.Request, bucket,
 // For objects in "Compliance" mode, retention date cannot be shortened, and mode cannot be altered.
 // For objects with legal hold header set, the s3:PutObjectLegalHold permission is expected to be set
 // Both legal hold and retention can be applied independently on an object
-func checkPutObjectLockAllowed(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, retentionPermErr, legalHoldPermErr APIErrorCode) (objectlock.Mode, objectlock.RetentionDate, objectlock.ObjectLegalHold, APIErrorCode) {
+func checkPutObjectLockAllowed(ctx context.Context, r *http.Request, bucket, object string, getObjectInfoFn GetObjectInfoFn, retentionPermErr, legalHoldPermErr APIErrorCode) (objectlock.RetMode, objectlock.RetentionDate, objectlock.ObjectLegalHold, APIErrorCode) {
-	var mode objectlock.Mode
+	var mode objectlock.RetMode
 	var retainDate objectlock.RetentionDate
 	var legalHold objectlock.ObjectLegalHold
 
-	retentionCfg, isWORMBucket := globalBucketObjectLockConfig.Get(bucket)
-
 	retentionRequested := objectlock.IsObjectLockRetentionRequested(r.Header)
 	legalHoldRequested := objectlock.IsObjectLockLegalHoldRequested(r.Header)
 
+	retentionCfg, isWORMBucket := globalBucketObjectLockConfig.Get(bucket)
+	if !isWORMBucket {
+		if legalHoldRequested || retentionRequested {
+			return mode, retainDate, legalHold, ErrInvalidBucketObjectLockConfiguration
+		}
+		// If this not a WORM enabled bucket, we should return right here.
+		return mode, retainDate, legalHold, ErrNone
+	}
+
 	var objExists bool
 	opts, err := getOpts(ctx, r, bucket, object)
 	if err != nil {
@@ -177,33 +288,30 @@ func checkPutObjectLockAllowed(ctx context.Context, r *http.Request, bucket, obj
 		logger.LogIf(ctx, err)
 		return mode, retainDate, legalHold, ErrObjectLocked
 	}
+
 	if objInfo, err := getObjectInfoFn(ctx, bucket, object, opts); err == nil {
 		objExists = true
 		r := objectlock.GetObjectRetentionMeta(objInfo.UserDefined)
-		if globalWORMEnabled || ((r.Mode == objectlock.Compliance) && r.RetainUntilDate.After(t)) {
+		if globalWORMEnabled || ((r.Mode == objectlock.RetCompliance) && r.RetainUntilDate.After(t)) {
 			return mode, retainDate, legalHold, ErrObjectLocked
 		}
 		mode = r.Mode
 		retainDate = r.RetainUntilDate
 		legalHold = objectlock.GetObjectLegalHoldMeta(objInfo.UserDefined)
 		// Disallow overwriting an object on legal hold
-		if legalHold.Status == "ON" {
+		if legalHold.Status == objectlock.LegalHoldOn {
 			return mode, retainDate, legalHold, ErrObjectLocked
 		}
 	}
+
 	if legalHoldRequested {
-		if !isWORMBucket {
-			return mode, retainDate, legalHold, ErrInvalidBucketObjectLockConfiguration
-		}
 		var lerr error
 		if legalHold, lerr = objectlock.ParseObjectLockLegalHoldHeaders(r.Header); lerr != nil {
 			return mode, retainDate, legalHold, toAPIErrorCode(ctx, err)
 		}
 	}
+
 	if retentionRequested {
-		if !isWORMBucket {
-			return mode, retainDate, legalHold, ErrInvalidBucketObjectLockConfiguration
-		}
 		legalHold, err := objectlock.ParseObjectLockLegalHoldHeaders(r.Header)
 		if err != nil {
 			return mode, retainDate, legalHold, toAPIErrorCode(ctx, err)
@@ -215,9 +323,6 @@ func checkPutObjectLockAllowed(ctx context.Context, r *http.Request, bucket, obj
 		if objExists && retainDate.After(t) {
 			return mode, retainDate, legalHold, ErrObjectLocked
 		}
-		if rMode == objectlock.Invalid {
-			return mode, retainDate, legalHold, toAPIErrorCode(ctx, objectlock.ErrObjectLockInvalidHeaders)
-		}
 		if retentionPermErr != ErrNone {
 			return mode, retainDate, legalHold, retentionPermErr
 		}
@@ -241,7 +346,7 @@ func checkPutObjectLockAllowed(ctx context.Context, r *http.Request, bucket, obj
 			// inherit retention from bucket configuration
 			return retentionCfg.Mode, objectlock.RetentionDate{Time: t.Add(retentionCfg.Validity)}, legalHold, ErrNone
 		}
-		return objectlock.Mode(""), objectlock.RetentionDate{}, legalHold, ErrNone
+		return "", objectlock.RetentionDate{}, legalHold, ErrNone
 	}
 	return mode, retainDate, legalHold, ErrNone
 }

cmd/policy.go

@@ -20,10 +20,10 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
-	"fmt"
 	"net/http"
 	"net/url"
 	"path"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -146,7 +146,7 @@ func NewPolicySys() *PolicySys {
 	}
 }
 
-func getConditionValues(request *http.Request, locationConstraint string, username string, claims map[string]interface{}) map[string][]string {
+func getConditionValues(r *http.Request, lc string, username string, claims map[string]interface{}) map[string][]string {
 	currTime := UTCNow()
 
 	principalType := "Anonymous"
@@ -156,22 +156,21 @@ func getConditionValues(request *http.Request, locationConstraint string, userna
 
 	args := map[string][]string{
 		"CurrentTime":     {currTime.Format(time.RFC3339)},
-		"EpochTime":       {fmt.Sprintf("%d", currTime.Unix())},
+		"EpochTime":       {strconv.FormatInt(currTime.Unix(), 10)},
+		"SecureTransport": {strconv.FormatBool(r.TLS != nil)},
+		"SourceIp":        {handlers.GetSourceIP(r)},
+		"UserAgent":       {r.UserAgent()},
+		"Referer":         {r.Referer()},
 		"principaltype":   {principalType},
-		"SecureTransport": {fmt.Sprintf("%t", request.TLS != nil)},
-		"SourceIp":        {handlers.GetSourceIP(request)},
-		"UserAgent":       {request.UserAgent()},
-		"Referer":         {request.Referer()},
 		"userid":          {username},
 		"username":        {username},
 	}
 
-	if locationConstraint != "" {
+	if lc != "" {
-		args["LocationConstraint"] = []string{locationConstraint}
+		args["LocationConstraint"] = []string{lc}
 	}
 
-	// TODO: support object-lock-remaining-retention-days
+	cloneHeader := r.Header.Clone()
-	cloneHeader := request.Header.Clone()
 
 	for _, objLock := range []string{
 		xhttp.AmzObjectLockMode,
@@ -193,7 +192,7 @@ func getConditionValues(request *http.Request, locationConstraint string, userna
 	}
 
 	var cloneURLValues = url.Values{}
-	for k, v := range request.URL.Query() {
+	for k, v := range r.URL.Query() {
 		cloneURLValues[k] = v
 	}
 

cmd/web-handlers.go

@@ -588,11 +588,17 @@ func (web *webAPIHandlers) RemoveObject(r *http.Request, args *RemoveObjectArgs,
 	if objectAPI == nil {
 		return toJSONError(ctx, errServerNotInitialized)
 	}
-	listObjects := objectAPI.ListObjects
+
 	getObjectInfo := objectAPI.GetObjectInfo
 	if web.CacheAPI() != nil {
 		getObjectInfo = web.CacheAPI().GetObjectInfo
 	}
+
+	deleteObjects := objectAPI.DeleteObjects
+	if web.CacheAPI() != nil {
+		deleteObjects = web.CacheAPI().DeleteObjects
+	}
+
 	claims, owner, authErr := webRequestAuthenticate(r)
 	if authErr != nil {
 		if authErr == errNoAuthToken {
@@ -688,6 +694,17 @@ next:
 				}) {
 					govBypassPerms = ErrNone
 				}
+				if globalIAMSys.IsAllowed(iampolicy.Args{
+					AccountName:     claims.AccessKey,
+					Action:          iampolicy.GetBucketObjectLockConfigurationAction,
+					BucketName:      args.BucketName,
+					ConditionValues: getConditionValues(r, "", claims.AccessKey, claims.Map()),
+					IsOwner:         owner,
+					ObjectName:      objectName,
+					Claims:          claims.Map(),
+				}) {
+					govBypassPerms = ErrNone
+				}
 			}
 			if authErr == errNoAuthToken {
 				// Check if object is allowed to be deleted anonymously
@@ -711,12 +728,44 @@ next:
 				}) {
 					govBypassPerms = ErrNone
 				}
+
+				// Check if object is allowed to be deleted anonymously
+				if globalPolicySys.IsAllowed(policy.Args{
+					Action:          policy.GetBucketObjectLockConfigurationAction,
+					BucketName:      args.BucketName,
+					ConditionValues: getConditionValues(r, "", "", nil),
+					IsOwner:         false,
+					ObjectName:      objectName,
+				}) {
+					govBypassPerms = ErrNone
+				}
 			}
-			if _, err := enforceRetentionBypassForDelete(ctx, r, args.BucketName, objectName, getObjectInfo, govBypassPerms); err != ErrNone {
+			if govBypassPerms != ErrNone {
 				return toJSONError(ctx, errAccessDenied)
 			}
-			if err = deleteObject(ctx, objectAPI, web.CacheAPI(), args.BucketName, objectName, r); err != nil {
+
-				break next
+			apiErr := ErrNone
+			// Deny if global WORM is enabled
+			if globalWORMEnabled {
+				opts, err := getOpts(ctx, r, args.BucketName, objectName)
+				if err != nil {
+					apiErr = toAPIErrorCode(ctx, err)
+				} else {
+					if _, err := getObjectInfo(ctx, args.BucketName, objectName, opts); err == nil {
+						apiErr = ErrMethodNotAllowed
+					}
+				}
+			}
+			if _, ok := globalBucketObjectLockConfig.Get(args.BucketName); ok && (apiErr == ErrNone) {
+				apiErr = enforceRetentionBypassForDeleteWeb(ctx, r, args.BucketName, objectName, getObjectInfo)
+				if apiErr != ErrNone && apiErr != ErrNoSuchKey {
+					return toJSONError(ctx, errAccessDenied)
+				}
+			}
+			if apiErr == ErrNone {
+				if err = deleteObject(ctx, objectAPI, web.CacheAPI(), args.BucketName, objectName, r); err != nil {
+					break next
+				}
 			}
 			continue
 		}
@@ -746,23 +795,34 @@ next:
 			}
 		}
 
-		// For directories, list the contents recursively and remove.
+		// Allocate new results channel to receive ObjectInfo.
-		marker := ""
+		objInfoCh := make(chan ObjectInfo)
+
+		// Walk through all objects
+		if err = objectAPI.Walk(ctx, args.BucketName, objectName, objInfoCh); err != nil {
+			break next
+		}
+
 		for {
-			var lo ListObjectsInfo
+			var objects []string
-			lo, err = listObjects(ctx, args.BucketName, objectName, marker, "", maxObjectList)
+			for obj := range objInfoCh {
-			if err != nil {
+				if len(objects) == maxObjectList {
-				break next
+					// Reached maximum delete requests, attempt a delete for now.
-			}
+					break
-			marker = lo.NextMarker
-			for _, obj := range lo.Objects {
-				err = deleteObject(ctx, objectAPI, web.CacheAPI(), args.BucketName, obj.Name, r)
-				if err != nil {
-					break next
 				}
+				objects = append(objects, obj.Name)
+			}
+
+			// Nothing to do.
+			if len(objects) == 0 {
+				break next
 			}
-			if !lo.IsTruncated {
+
-				break
+			// Deletes a list of objects.
+			_, err = deleteObjects(ctx, args.BucketName, objects)
+			if err != nil {
+				logger.LogIf(ctx, err)
+				break next
 			}
 		}
 	}
@@ -1097,27 +1157,30 @@ func (web *webAPIHandlers) Upload(w http.ResponseWriter, r *http.Request) {
 	// Ensure that metadata does not contain sensitive information
 	crypto.RemoveSensitiveEntries(metadata)
 
+	retentionRequested := objectlock.IsObjectLockRetentionRequested(r.Header)
+	legalHoldRequested := objectlock.IsObjectLockLegalHoldRequested(r.Header)
+
+	putObject := objectAPI.PutObject
 	getObjectInfo := objectAPI.GetObjectInfo
 	if web.CacheAPI() != nil {
+		putObject = web.CacheAPI().PutObject
 		getObjectInfo = web.CacheAPI().GetObjectInfo
 	}
-	// enforce object retention rules
-	retentionMode, retentionDate, legalHold, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, getObjectInfo, retPerms, holdPerms)
-	if s3Err == ErrNone && retentionMode != "" {
-		opts.UserDefined[xhttp.AmzObjectLockMode] = string(retentionMode)
-		opts.UserDefined[xhttp.AmzObjectLockRetainUntilDate] = retentionDate.UTC().Format(time.RFC3339)
-	}
-	if s3Err == ErrNone && legalHold.Status != "" {
-		opts.UserDefined[xhttp.AmzObjectLockLegalHold] = string(legalHold.Status)
-	}
-	if s3Err != ErrNone {
-		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
-		return
-	}
 
-	putObject := objectAPI.PutObject
+	if retentionRequested || legalHoldRequested {
-	if web.CacheAPI() != nil {
+		// enforce object retention rules
-		putObject = web.CacheAPI().PutObject
+		retentionMode, retentionDate, legalHold, s3Err := checkPutObjectLockAllowed(ctx, r, bucket, object, getObjectInfo, retPerms, holdPerms)
+		if s3Err == ErrNone && retentionMode != "" {
+			opts.UserDefined[xhttp.AmzObjectLockMode] = string(retentionMode)
+			opts.UserDefined[xhttp.AmzObjectLockRetainUntilDate] = retentionDate.UTC().Format(time.RFC3339)
+		}
+		if s3Err == ErrNone && legalHold.Status != "" {
+			opts.UserDefined[xhttp.AmzObjectLockLegalHold] = string(legalHold.Status)
+		}
+		if s3Err != ErrNone {
+			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL, guessIsBrowserReq(r))
+			return
+		}
 	}
 
 	objInfo, err := putObject(context.Background(), bucket, object, pReader, opts)
@@ -1462,13 +1525,12 @@ func (web *webAPIHandlers) DownloadZip(w http.ResponseWriter, r *http.Request) {
 		writeWebErrorResponse(w, errInvalidBucketName)
 		return
 	}
+
 	getObjectNInfo := objectAPI.GetObjectNInfo
 	if web.CacheAPI() != nil {
 		getObjectNInfo = web.CacheAPI().GetObjectNInfo
 	}
 
-	listObjects := objectAPI.ListObjects
-
 	archive := zip.NewWriter(w)
 	defer archive.Close()
 
@@ -1541,29 +1603,24 @@ func (web *webAPIHandlers) DownloadZip(w http.ResponseWriter, r *http.Request) {
 			// If not a directory, compress the file and write it to response.
 			err := zipit(pathJoin(args.Prefix, object))
 			if err != nil {
+				logger.LogIf(ctx, err)
 				return
 			}
 			continue
 		}
 
-		// For directories, list the contents recursively and write the objects as compressed
+		objInfoCh := make(chan ObjectInfo)
-		// date to the response writer.
+
-		marker := ""
+		// Walk through all objects
-		for {
+		if err := objectAPI.Walk(ctx, args.BucketName, pathJoin(args.Prefix, object), objInfoCh); err != nil {
-			lo, err := listObjects(ctx, args.BucketName, pathJoin(args.Prefix, object), marker, "",
+			logger.LogIf(ctx, err)
-				maxObjectList)
+			continue
-			if err != nil {
+		}
-				return
+
-			}
+		for obj := range objInfoCh {
-			marker = lo.NextMarker
+			if err := zipit(obj.Name); err != nil {
-			for _, obj := range lo.Objects {
+				logger.LogIf(ctx, err)
-				err = zipit(obj.Name)
+				continue
-				if err != nil {
-					return
-				}
-			}
-			if !lo.IsTruncated {
-				break
 			}
 		}
 	}

pkg/bucket/object/lock/lock.go

@@ -28,33 +28,36 @@ import (
 	"time"
 
 	"github.com/beevik/ntp"
-	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/env"
 )
 
-// Mode - object retention mode.
+// RetMode - object retention mode.
-type Mode string
+type RetMode string
 
 const (
-	// Governance - governance mode.
+	// RetGovernance - governance mode.
-	Governance Mode = "GOVERNANCE"
+	RetGovernance RetMode = "GOVERNANCE"
 
-	// Compliance - compliance mode.
+	// RetCompliance - compliance mode.
-	Compliance Mode = "COMPLIANCE"
+	RetCompliance RetMode = "COMPLIANCE"
-
-	// Invalid - invalid retention mode.
-	Invalid Mode = ""
 )
 
-func parseMode(modeStr string) (mode Mode) {
+// 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 = Governance
+		mode = RetGovernance
 	case "COMPLIANCE":
-		mode = Compliance
+		mode = RetCompliance
-	default:
-		mode = Invalid
 	}
 	return mode
 }
@@ -63,23 +66,40 @@ func parseMode(modeStr string) (mode Mode) {
 type LegalHoldStatus string
 
 const (
-	// ON -legal hold is on.
+	// LegalHoldOn - legal hold is on.
-	ON LegalHoldStatus = "ON"
+	LegalHoldOn LegalHoldStatus = "ON"
 
-	// OFF -legal hold is off.
+	// LegalHoldOff - legal hold is off.
-	OFF LegalHoldStatus = "OFF"
+	LegalHoldOff LegalHoldStatus = "OFF"
 )
 
-func parseLegalHoldStatus(holdStr string) LegalHoldStatus {
+// 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":
-		return ON
+		st = LegalHoldOn
 	case "OFF":
-		return OFF
+		st = LegalHoldOff
 	}
-	return LegalHoldStatus("")
+	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")
@@ -118,13 +138,13 @@ func UTCNowNTP() (time.Time, error) {
 
 // Retention - bucket level retention configuration.
 type Retention struct {
-	Mode     Mode
+	Mode     RetMode
 	Validity time.Duration
 }
 
 // IsEmpty - returns whether retention is empty or not.
 func (r Retention) IsEmpty() bool {
-	return r.Mode == "" || r.Validity == 0
+	return !r.Mode.Valid() || r.Validity == 0
 }
 
 // Retain - check whether given date is retainable by validity time.
@@ -176,7 +196,7 @@ func NewBucketObjectLockConfig() *BucketObjectLockConfig {
 // DefaultRetention - default retention configuration.
 type DefaultRetention struct {
 	XMLName xml.Name `xml:"DefaultRetention"`
-	Mode    Mode     `xml:"Mode"`
+	Mode    RetMode  `xml:"Mode"`
 	Days    *uint64  `xml:"Days"`
 	Years   *uint64  `xml:"Years"`
 }
@@ -198,8 +218,8 @@ func (dr *DefaultRetention) UnmarshalXML(d *xml.Decoder, start xml.StartElement)
 		return err
 	}
 
-	switch string(retention.Mode) {
+	switch retention.Mode {
-	case "GOVERNANCE", "COMPLIANCE":
+	case RetGovernance, RetCompliance:
 	default:
 		return fmt.Errorf("unknown retention mode %v", retention.Mode)
 	}
@@ -282,10 +302,13 @@ func (config *Config) ToRetention() (r Retention) {
 	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(reader).Decode(&config); err != nil {
+	if err := xml.NewDecoder(io.LimitReader(reader, maxObjectLockConfigSize)).Decode(&config); err != nil {
 		return nil, err
 	}
 
@@ -338,17 +361,20 @@ func (rDate *RetentionDate) MarshalXML(e *xml.Encoder, startElement xml.StartEle
 type ObjectRetention struct {
 	XMLNS           string        `xml:"xmlns,attr,omitempty"`
 	XMLName         xml.Name      `xml:"Retention"`
-	Mode            Mode          `xml:"Mode,omitempty"`
+	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(reader).Decode(&ret); err != nil {
+	if err := xml.NewDecoder(io.LimitReader(reader, maxObjectRetentionSize)).Decode(&ret); err != nil {
 		return nil, err
 	}
-	if ret.Mode != Compliance && ret.Mode != Governance {
+	if !ret.Mode.Valid() {
 		return &ret, ErrUnknownWORMModeDirective
 	}
 
@@ -367,10 +393,10 @@ func ParseObjectRetention(reader io.Reader) (*ObjectRetention, error) {
 
 // IsObjectLockRetentionRequested returns true if object lock retention headers are set.
 func IsObjectLockRetentionRequested(h http.Header) bool {
-	if _, ok := h[xhttp.AmzObjectLockMode]; ok {
+	if _, ok := h[AmzObjectLockMode]; ok {
 		return true
 	}
-	if _, ok := h[xhttp.AmzObjectLockRetainUntilDate]; ok {
+	if _, ok := h[AmzObjectLockRetainUntilDate]; ok {
 		return true
 	}
 	return false
@@ -378,13 +404,13 @@ func IsObjectLockRetentionRequested(h http.Header) bool {
 
 // IsObjectLockLegalHoldRequested returns true if object lock legal hold header is set.
 func IsObjectLockLegalHoldRequested(h http.Header) bool {
-	_, ok := h[xhttp.AmzObjectLockLegalHold]
+	_, ok := h[AmzObjectLockLegalHold]
 	return ok
 }
 
 // IsObjectLockGovernanceBypassSet returns true if object lock governance bypass header is set.
 func IsObjectLockGovernanceBypassSet(h http.Header) bool {
-	return strings.ToLower(h.Get(xhttp.AmzObjectLockBypassGovernance)) == "true"
+	return strings.ToLower(h.Get(AmzObjectLockBypassRetGovernance)) == "true"
 }
 
 // IsObjectLockRequested returns true if legal hold or object lock retention headers are requested.
@@ -393,14 +419,15 @@ func IsObjectLockRequested(h http.Header) bool {
 }
 
 // ParseObjectLockRetentionHeaders parses http headers to extract retention mode and retention date
-func ParseObjectLockRetentionHeaders(h http.Header) (rmode Mode, r RetentionDate, err error) {
+func ParseObjectLockRetentionHeaders(h http.Header) (rmode RetMode, r RetentionDate, err error) {
-	retMode := h.Get(xhttp.AmzObjectLockMode)
+	retMode := h.Get(AmzObjectLockMode)
-	dateStr := h.Get(xhttp.AmzObjectLockRetainUntilDate)
+	dateStr := h.Get(AmzObjectLockRetainUntilDate)
 	if len(retMode) == 0 || len(dateStr) == 0 {
 		return rmode, r, ErrObjectLockInvalidHeaders
 	}
-	rmode = parseMode(retMode)
+
-	if rmode == Invalid {
+	rmode = parseRetMode(retMode)
+	if !rmode.Valid() {
 		return rmode, r, ErrUnknownWORMModeDirective
 	}
 
@@ -429,13 +456,13 @@ func ParseObjectLockRetentionHeaders(h http.Header) (rmode Mode, r RetentionDate
 
 // GetObjectRetentionMeta constructs ObjectRetention from metadata
 func GetObjectRetentionMeta(meta map[string]string) ObjectRetention {
-	var mode Mode
+	var mode RetMode
 	var retainTill RetentionDate
 
-	if modeStr, ok := meta[strings.ToLower(xhttp.AmzObjectLockMode)]; ok {
+	if modeStr, ok := meta[strings.ToLower(AmzObjectLockMode)]; ok {
-		mode = parseMode(modeStr)
+		mode = parseRetMode(modeStr)
 	}
-	if tillStr, ok := meta[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)]; ok {
+	if tillStr, ok := meta[strings.ToLower(AmzObjectLockRetainUntilDate)]; ok {
 		if t, e := time.Parse(time.RFC3339, tillStr); e == nil {
 			retainTill = RetentionDate{t.UTC()}
 		}
@@ -445,8 +472,7 @@ func GetObjectRetentionMeta(meta map[string]string) ObjectRetention {
 
 // GetObjectLegalHoldMeta constructs ObjectLegalHold from metadata
 func GetObjectLegalHoldMeta(meta map[string]string) ObjectLegalHold {
-
+	holdStr, ok := meta[strings.ToLower(AmzObjectLockLegalHold)]
-	holdStr, ok := meta[strings.ToLower(xhttp.AmzObjectLockLegalHold)]
 	if ok {
 		return ObjectLegalHold{XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/", Status: parseLegalHoldStatus(holdStr)}
 	}
@@ -455,13 +481,13 @@ func GetObjectLegalHoldMeta(meta map[string]string) ObjectLegalHold {
 
 // ParseObjectLockLegalHoldHeaders parses request headers to construct ObjectLegalHold
 func ParseObjectLockLegalHoldHeaders(h http.Header) (lhold ObjectLegalHold, err error) {
-	holdStatus, ok := h[xhttp.AmzObjectLockLegalHold]
+	holdStatus, ok := h[AmzObjectLockLegalHold]
 	if ok {
-		lh := parseLegalHoldStatus(strings.Join(holdStatus, ""))
+		lh := parseLegalHoldStatus(holdStatus[0])
-		if lh != ON && lh != OFF {
+		if !lh.Valid() {
 			return lhold, ErrUnknownWORMModeDirective
 		}
-		lhold = ObjectLegalHold{Status: lh}
+		lhold = ObjectLegalHold{XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/", Status: lh}
 	}
 	return lhold, nil
 
@@ -477,16 +503,17 @@ type ObjectLegalHold struct {
 
 // IsEmpty returns true if struct is empty
 func (l *ObjectLegalHold) IsEmpty() bool {
-	return l.Status != ON && l.Status != OFF
+	return !l.Status.Valid()
 }
 
 // ParseObjectLegalHold decodes the XML into ObjectLegalHold
 func ParseObjectLegalHold(reader io.Reader) (hold *ObjectLegalHold, err error) {
-	if err = xml.NewDecoder(reader).Decode(&hold); err != nil {
+	hold = &ObjectLegalHold{}
+	if err = xml.NewDecoder(reader).Decode(hold); err != nil {
 		return
 	}
 
-	if hold.Status != ON && hold.Status != OFF {
+	if !hold.Status.Valid() {
 		return nil, ErrMalformedXML
 	}
 	return
@@ -511,15 +538,14 @@ func FilterObjectLockMetadata(metadata map[string]string, filterRetention, filte
 		delete(dst, key)
 	}
 	legalHold := GetObjectLegalHoldMeta(metadata)
-	if legalHold.Status == "" || filterLegalHold {
+	if !legalHold.Status.Valid() || filterLegalHold {
-		delKey(xhttp.AmzObjectLockLegalHold)
+		delKey(AmzObjectLockLegalHold)
 	}
 
 	ret := GetObjectRetentionMeta(metadata)
-
+	if !ret.Mode.Valid() || filterRetention {
-	if ret.Mode == Invalid || filterRetention {
+		delKey(AmzObjectLockMode)
-		delKey(xhttp.AmzObjectLockMode)
+		delKey(AmzObjectLockRetainUntilDate)
-		delKey(xhttp.AmzObjectLockRetainUntilDate)
 		return dst
 	}
 	return dst

pkg/bucket/object/lock/lock_test.go

@@ -31,25 +31,25 @@ import (
 func TestParseMode(t *testing.T) {
 	testCases := []struct {
 		value        string
-		expectedMode Mode
+		expectedMode RetMode
 	}{
 		{
 			value:        "governance",
-			expectedMode: Governance,
+			expectedMode: RetGovernance,
 		},
 		{
 			value:        "complIAnce",
-			expectedMode: Compliance,
+			expectedMode: RetCompliance,
 		},
 		{
 			value:        "gce",
-			expectedMode: Invalid,
+			expectedMode: "",
 		},
 	}
 
 	for _, tc := range testCases {
-		if parseMode(tc.value) != tc.expectedMode {
+		if parseRetMode(tc.value) != tc.expectedMode {
-			t.Errorf("Expected Mode %s, got %s", tc.expectedMode, parseMode(tc.value))
+			t.Errorf("Expected Mode %s, got %s", tc.expectedMode, parseRetMode(tc.value))
 		}
 	}
 }
@@ -60,11 +60,11 @@ func TestParseLegalHoldStatus(t *testing.T) {
 	}{
 		{
 			value:          "ON",
-			expectedStatus: ON,
+			expectedStatus: LegalHoldOn,
 		},
 		{
 			value:          "Off",
-			expectedStatus: OFF,
+			expectedStatus: LegalHoldOff,
 		},
 		{
 			value:          "x",
@@ -98,32 +98,32 @@ func TestUnmarshalDefaultRetention(t *testing.T) {
 			expectErr:   true,
 		},
 		{
-			value:       DefaultRetention{Mode: "GOVERNANCE"},
+			value:       DefaultRetention{Mode: RetGovernance},
 			expectedErr: fmt.Errorf("either Days or Years must be specified"),
 			expectErr:   true,
 		},
 		{
-			value:       DefaultRetention{Mode: "GOVERNANCE", Days: &days},
+			value:       DefaultRetention{Mode: RetGovernance, Days: &days},
 			expectedErr: nil,
 			expectErr:   false,
 		},
 		{
-			value:       DefaultRetention{Mode: "GOVERNANCE", Years: &years},
+			value:       DefaultRetention{Mode: RetGovernance, Years: &years},
 			expectedErr: nil,
 			expectErr:   false,
 		},
 		{
-			value:       DefaultRetention{Mode: "GOVERNANCE", Days: &days, Years: &years},
+			value:       DefaultRetention{Mode: RetGovernance, Days: &days, Years: &years},
 			expectedErr: fmt.Errorf("either Days or Years must be specified, not both"),
 			expectErr:   true,
 		},
 		{
-			value:       DefaultRetention{Mode: "GOVERNANCE", Days: &zerodays},
+			value:       DefaultRetention{Mode: RetGovernance, Days: &zerodays},
 			expectedErr: fmt.Errorf("Default retention period must be a positive integer value for 'Days'"),
 			expectErr:   true,
 		},
 		{
-			value:       DefaultRetention{Mode: "GOVERNANCE", Days: &invalidDays},
+			value:       DefaultRetention{Mode: RetGovernance, Days: &invalidDays},
 			expectedErr: fmt.Errorf("Default retention period too large for 'Days' %d", invalidDays),
 			expectErr:   true,
 		},
@@ -234,20 +234,20 @@ func TestIsObjectLockRequested(t *testing.T) {
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockLegalHold: []string{""},
+				AmzObjectLockLegalHold: []string{""},
 			},
 			expectedVal: true,
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockRetainUntilDate: []string{""},
+				AmzObjectLockRetainUntilDate: []string{""},
-				xhttp.AmzObjectLockMode:            []string{""},
+				AmzObjectLockMode:            []string{""},
 			},
 			expectedVal: true,
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockBypassGovernance: []string{""},
+				AmzObjectLockBypassRetGovernance: []string{""},
 			},
 			expectedVal: false,
 		},
@@ -275,26 +275,26 @@ func TestIsObjectLockGovernanceBypassSet(t *testing.T) {
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockLegalHold: []string{""},
+				AmzObjectLockLegalHold: []string{""},
 			},
 			expectedVal: false,
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockRetainUntilDate: []string{""},
+				AmzObjectLockRetainUntilDate: []string{""},
-				xhttp.AmzObjectLockMode:            []string{""},
+				AmzObjectLockMode:            []string{""},
 			},
 			expectedVal: false,
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockBypassGovernance: []string{""},
+				AmzObjectLockBypassRetGovernance: []string{""},
 			},
 			expectedVal: false,
 		},
 		{
 			header: http.Header{
-				xhttp.AmzObjectLockBypassGovernance: []string{"true"},
+				AmzObjectLockBypassRetGovernance: []string{"true"},
 			},
 			expectedVal: true,
 		},
@@ -394,7 +394,7 @@ func TestGetObjectRetentionMeta(t *testing.T) {
 			metadata: map[string]string{
 				"x-amz-object-lock-mode": "governance",
 			},
-			expected: ObjectRetention{Mode: Governance},
+			expected: ObjectRetention{Mode: RetGovernance},
 		},
 		{
 			metadata: map[string]string{
@@ -427,13 +427,13 @@ func TestGetObjectLegalHoldMeta(t *testing.T) {
 			metadata: map[string]string{
 				"x-amz-object-lock-legal-hold": "on",
 			},
-			expected: ObjectLegalHold{Status: ON},
+			expected: ObjectLegalHold{Status: LegalHoldOn},
 		},
 		{
 			metadata: map[string]string{
 				"x-amz-object-lock-legal-hold": "off",
 			},
-			expected: ObjectLegalHold{Status: OFF},
+			expected: ObjectLegalHold{Status: LegalHoldOff},
 		},
 		{
 			metadata: map[string]string{

pkg/bucket/policy/action.go

@@ -263,12 +263,14 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 			condition.S3ObjectLockMode,
 			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
+
+	// https://docs.aws.amazon.com/AmazonS3/latest/dev/list_amazons3.html
+	// LockLegalHold is not supported with PutObjectRetentionAction
 	PutObjectRetentionAction: condition.NewKeySet(
 		append([]condition.Key{
 			condition.S3ObjectLockRemainingRetentionDays,
 			condition.S3ObjectLockRetainUntilDate,
 			condition.S3ObjectLockMode,
-			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
 
 	GetObjectRetentionAction: condition.NewKeySet(condition.CommonKeys...),
@@ -277,6 +279,8 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
 	GetObjectLegalHoldAction: condition.NewKeySet(condition.CommonKeys...),
+
+	// https://docs.aws.amazon.com/AmazonS3/latest/dev/list_amazons3.html
 	BypassGovernanceRetentionAction: condition.NewKeySet(
 		append([]condition.Key{
 			condition.S3ObjectLockRemainingRetentionDays,
@@ -284,6 +288,7 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 			condition.S3ObjectLockMode,
 			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
+
 	GetBucketObjectLockConfigurationAction: condition.NewKeySet(condition.CommonKeys...),
 	PutBucketObjectLockConfigurationAction: condition.NewKeySet(condition.CommonKeys...),
 	PutObjectTaggingAction:                 condition.NewKeySet(condition.CommonKeys...),

pkg/bucket/policy/condition/stringequalsfunc.go

@@ -112,7 +112,6 @@ func valuesToStringSlice(n name, values ValueSet) ([]string, error) {
 	valueStrings := []string{}
 
 	for value := range values {
-		// FIXME: if AWS supports non-string values, we would need to support it.
 		s, err := value.GetString()
 		if err != nil {
 			return nil, fmt.Errorf("value must be a string for %v condition", n)

pkg/iam/policy/action.go

@@ -301,12 +301,13 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
 
+	// https://docs.aws.amazon.com/AmazonS3/latest/dev/list_amazons3.html
+	// LockLegalHold is not supported with PutObjectRetentionAction
 	PutObjectRetentionAction: condition.NewKeySet(
 		append([]condition.Key{
 			condition.S3ObjectLockRemainingRetentionDays,
 			condition.S3ObjectLockRetainUntilDate,
 			condition.S3ObjectLockMode,
-			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
 
 	GetObjectRetentionAction: condition.NewKeySet(condition.CommonKeys...),
@@ -315,6 +316,8 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
 	GetObjectLegalHoldAction: condition.NewKeySet(condition.CommonKeys...),
+
+	// https://docs.aws.amazon.com/AmazonS3/latest/dev/list_amazons3.html
 	BypassGovernanceRetentionAction: condition.NewKeySet(
 		append([]condition.Key{
 			condition.S3ObjectLockRemainingRetentionDays,
@@ -322,6 +325,7 @@ var actionConditionKeyMap = map[Action]condition.KeySet{
 			condition.S3ObjectLockMode,
 			condition.S3ObjectLockLegalHold,
 		}, condition.CommonKeys...)...),
+
 	GetBucketObjectLockConfigurationAction: condition.NewKeySet(condition.CommonKeys...),
 	PutBucketObjectLockConfigurationAction: condition.NewKeySet(condition.CommonKeys...),
 	PutObjectTaggingAction:                 condition.NewKeySet(condition.CommonKeys...),