577 lines
13 KiB
Go
577 lines
13 KiB
Go
package acl
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import (
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"bytes"
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"context"
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"fmt"
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acl "github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
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"github.com/nspcc-dev/neofs-api-go/pkg/container"
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"github.com/nspcc-dev/neofs-api-go/pkg/owner"
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"github.com/nspcc-dev/neofs-api-go/v2/object"
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"github.com/nspcc-dev/neofs-api-go/v2/session"
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core "github.com/nspcc-dev/neofs-node/pkg/core/container"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/localstore"
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"github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl"
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eaclV2 "github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl/v2"
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"github.com/pkg/errors"
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)
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type (
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// Service checks basic ACL rules.
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Service struct {
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*cfg
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}
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putStreamBasicChecker struct {
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source *Service
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next object.PutObjectStreamer
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*eACLCfg
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}
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getStreamBasicChecker struct {
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next object.GetObjectStreamer
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info requestInfo
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*eACLCfg
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}
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searchStreamBasicChecker struct {
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object.SearchObjectStreamer
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}
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getRangeStreamBasicChecker struct {
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object.GetRangeObjectStreamer
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}
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requestInfo struct {
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basicACL basicACLHelper
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requestRole acl.Role
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operation acl.Operation // put, get, head, etc.
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owner *owner.ID // container owner
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cid *container.ID
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senderKey []byte
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}
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)
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// Option represents Service constructor option.
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type Option func(*cfg)
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type cfg struct {
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containers core.Source
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sender SenderClassifier
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next object.Service
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*eACLCfg
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}
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type eACLCfg struct {
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eACLOpts []eacl.Option
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eACL *eacl.Validator
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localStorage *localstore.Storage
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}
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type accessErr struct {
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requestInfo
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failedCheckTyp string
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}
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var (
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ErrMalformedRequest = errors.New("malformed request")
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ErrInternal = errors.New("internal error")
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ErrUnknownRole = errors.New("can't classify request sender")
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ErrUnknownContainer = errors.New("can't fetch container info")
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)
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func defaultCfg() *cfg {
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return &cfg{
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eACLCfg: new(eACLCfg),
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}
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}
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// New is a constructor for object ACL checking service.
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func New(opts ...Option) Service {
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cfg := defaultCfg()
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for i := range opts {
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opts[i](cfg)
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}
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cfg.eACL = eacl.NewValidator(cfg.eACLOpts...)
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return Service{
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cfg: cfg,
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}
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}
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func (b Service) Get(
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ctx context.Context,
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request *object.GetRequest) (object.GetObjectStreamer, error) {
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return nil, err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: request.GetMetaHeader().GetSessionToken(),
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}
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reqInfo, err := b.findRequestInfo(req, cid, acl.OperationGet)
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if err != nil {
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return nil, err
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}
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if !basicACLCheck(reqInfo) {
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return nil, basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
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return nil, eACLErr(reqInfo)
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}
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stream, err := b.next.Get(ctx, request)
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return getStreamBasicChecker{
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next: stream,
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info: reqInfo,
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eACLCfg: b.eACLCfg,
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}, err
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}
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func (b Service) Put(ctx context.Context) (object.PutObjectStreamer, error) {
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streamer, err := b.next.Put(ctx)
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return putStreamBasicChecker{
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source: &b,
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next: streamer,
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eACLCfg: b.eACLCfg,
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}, err
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}
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func (b Service) Head(
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ctx context.Context,
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request *object.HeadRequest) (*object.HeadResponse, error) {
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return nil, err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: request.GetMetaHeader().GetSessionToken(),
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}
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reqInfo, err := b.findRequestInfo(req, cid, acl.OperationHead)
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if err != nil {
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return nil, err
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}
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if !basicACLCheck(reqInfo) {
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return nil, basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
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return nil, eACLErr(reqInfo)
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}
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resp, err := b.next.Head(ctx, request)
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if err == nil {
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if !eACLCheck(resp, reqInfo, b.eACLCfg) {
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err = eACLErr(reqInfo)
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}
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}
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return resp, err
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}
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func (b Service) Search(
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ctx context.Context,
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request *object.SearchRequest) (object.SearchObjectStreamer, error) {
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var cid *container.ID
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return nil, err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: request.GetMetaHeader().GetSessionToken(),
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}
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reqInfo, err := b.findRequestInfo(req, cid, acl.OperationSearch)
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if err != nil {
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return nil, err
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}
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if !basicACLCheck(reqInfo) {
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return nil, basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
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return nil, eACLErr(reqInfo)
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}
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stream, err := b.next.Search(ctx, request)
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return searchStreamBasicChecker{stream}, err
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}
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func (b Service) Delete(
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ctx context.Context,
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request *object.DeleteRequest) (*object.DeleteResponse, error) {
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return nil, err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: request.GetMetaHeader().GetSessionToken(),
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}
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reqInfo, err := b.findRequestInfo(req, cid, acl.OperationDelete)
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if err != nil {
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return nil, err
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}
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if !basicACLCheck(reqInfo) {
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return nil, basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
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return nil, eACLErr(reqInfo)
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}
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return b.next.Delete(ctx, request)
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}
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func (b Service) GetRange(
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ctx context.Context,
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request *object.GetRangeRequest) (object.GetRangeObjectStreamer, error) {
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return nil, err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: request.GetMetaHeader().GetSessionToken(),
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}
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reqInfo, err := b.findRequestInfo(req, cid, acl.OperationRange)
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if err != nil {
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return nil, err
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}
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if !basicACLCheck(reqInfo) {
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return nil, basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
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return nil, eACLErr(reqInfo)
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}
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stream, err := b.next.GetRange(ctx, request)
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return getRangeStreamBasicChecker{stream}, err
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}
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func (b Service) GetRangeHash(
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ctx context.Context,
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request *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return nil, err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: request.GetMetaHeader().GetSessionToken(),
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}
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reqInfo, err := b.findRequestInfo(req, cid, acl.OperationRangeHash)
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if err != nil {
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return nil, err
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}
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if !basicACLCheck(reqInfo) {
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return nil, basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
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return nil, eACLErr(reqInfo)
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}
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return b.next.GetRangeHash(ctx, request)
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}
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func (p putStreamBasicChecker) Send(request *object.PutRequest) error {
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body := request.GetBody()
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if body == nil {
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return ErrMalformedRequest
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}
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part := body.GetObjectPart()
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if part, ok := part.(*object.PutObjectPartInit); ok {
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cid, err := getContainerIDFromRequest(request)
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if err != nil {
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return err
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}
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ownerID, err := getObjectOwnerFromMessage(request)
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if err != nil {
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return err
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}
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req := metaWithToken{
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vheader: request.GetVerificationHeader(),
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token: part.GetHeader().GetSessionToken(),
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}
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reqInfo, err := p.source.findRequestInfo(req, cid, acl.OperationPut)
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if err != nil {
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return err
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}
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if !basicACLCheck(reqInfo) || !stickyBitCheck(reqInfo, ownerID) {
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return basicACLErr(reqInfo)
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} else if !eACLCheck(request, reqInfo, p.eACLCfg) {
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return eACLErr(reqInfo)
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}
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}
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return p.next.Send(request)
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}
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func (p putStreamBasicChecker) CloseAndRecv() (*object.PutResponse, error) {
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return p.next.CloseAndRecv()
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}
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func (g getStreamBasicChecker) Recv() (*object.GetResponse, error) {
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resp, err := g.next.Recv()
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if err != nil {
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return resp, err
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}
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body := resp.GetBody()
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if body == nil {
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return resp, err
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}
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part := body.GetObjectPart()
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if _, ok := part.(*object.GetObjectPartInit); ok {
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ownerID, err := getObjectOwnerFromMessage(resp)
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if err != nil {
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return nil, err
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}
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if !stickyBitCheck(g.info, ownerID) {
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return nil, basicACLErr(g.info)
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} else if !eACLCheck(resp, g.info, g.eACLCfg) {
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return nil, eACLErr(g.info)
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}
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}
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return resp, err
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}
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func (b Service) findRequestInfo(
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req metaWithToken,
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cid *container.ID,
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op acl.Operation) (info requestInfo, err error) {
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// fetch actual container
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cnr, err := b.containers.Get(cid)
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if err != nil || cnr.GetOwnerID() == nil {
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return info, ErrUnknownContainer
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}
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// find request role and key
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role, key, err := b.sender.Classify(req, cid, cnr)
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if err != nil {
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return info, err
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}
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if role == acl.RoleUnknown {
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return info, ErrUnknownRole
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}
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// find verb from token if it is present
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verb := sourceVerbOfRequest(req, op)
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// todo: check verb sanity, if it was generated correctly. Do we need it ?
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info.basicACL = basicACLHelper(cnr.GetBasicACL())
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info.requestRole = role
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info.operation = verb
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info.owner = owner.NewIDFromV2(cnr.GetOwnerID())
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info.cid = cid
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// it is assumed that at the moment the key will be valid,
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// otherwise the request would not pass validation
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info.senderKey = key
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return info, nil
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}
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func getContainerIDFromRequest(req interface{}) (id *container.ID, err error) {
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switch v := req.(type) {
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case *object.GetRequest:
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return container.NewIDFromV2(v.GetBody().GetAddress().GetContainerID()), nil
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case *object.PutRequest:
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objPart := v.GetBody().GetObjectPart()
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if part, ok := objPart.(*object.PutObjectPartInit); ok {
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return container.NewIDFromV2(part.GetHeader().GetContainerID()), nil
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} else {
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return nil, errors.New("can't get cid in chunk")
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}
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case *object.HeadRequest:
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return container.NewIDFromV2(v.GetBody().GetAddress().GetContainerID()), nil
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case *object.SearchRequest:
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return container.NewIDFromV2(v.GetBody().GetContainerID()), nil
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case *object.DeleteRequest:
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return container.NewIDFromV2(v.GetBody().GetAddress().GetContainerID()), nil
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case *object.GetRangeRequest:
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return container.NewIDFromV2(v.GetBody().GetAddress().GetContainerID()), nil
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case *object.GetRangeHashRequest:
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return container.NewIDFromV2(v.GetBody().GetAddress().GetContainerID()), nil
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default:
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return nil, errors.New("unknown request type")
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}
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}
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func getObjectOwnerFromMessage(req interface{}) (id *owner.ID, err error) {
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switch v := req.(type) {
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case *object.PutRequest:
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objPart := v.GetBody().GetObjectPart()
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if part, ok := objPart.(*object.PutObjectPartInit); ok {
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return owner.NewIDFromV2(part.GetHeader().GetOwnerID()), nil
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} else {
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return nil, errors.New("can't get cid in chunk")
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}
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case *object.GetResponse:
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objPart := v.GetBody().GetObjectPart()
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if part, ok := objPart.(*object.GetObjectPartInit); ok {
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return owner.NewIDFromV2(part.GetHeader().GetOwnerID()), nil
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} else {
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return nil, errors.New("can't get cid in chunk")
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}
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default:
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return nil, errors.New("unsupported request type")
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}
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}
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// main check function for basic ACL
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func basicACLCheck(info requestInfo) bool {
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// check basic ACL permissions
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var checkFn func(acl.Operation) bool
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switch info.requestRole {
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case acl.RoleUser:
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checkFn = info.basicACL.UserAllowed
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case acl.RoleSystem:
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checkFn = info.basicACL.SystemAllowed
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case acl.RoleOthers:
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checkFn = info.basicACL.OthersAllowed
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default:
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// log there
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return false
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}
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return checkFn(info.operation)
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}
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func stickyBitCheck(info requestInfo, owner *owner.ID) bool {
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if owner == nil || info.owner == nil {
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return false
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}
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if !info.basicACL.Sticky() {
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return true
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}
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return bytes.Equal(owner.ToV2().GetValue(), info.owner.ToV2().GetValue())
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}
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func eACLCheck(msg interface{}, reqInfo requestInfo, cfg *eACLCfg) bool {
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if reqInfo.basicACL.Final() {
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return true
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}
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hdrSrcOpts := make([]eaclV2.Option, 0, 2)
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hdrSrcOpts = append(hdrSrcOpts, eaclV2.WithLocalObjectStorage(cfg.localStorage))
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if req, ok := msg.(eaclV2.Request); ok {
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hdrSrcOpts = append(hdrSrcOpts, eaclV2.WithServiceRequest(req))
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} else {
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hdrSrcOpts = append(hdrSrcOpts, eaclV2.WithServiceResponse(msg.(eaclV2.Response)))
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}
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action := cfg.eACL.CalculateAction(new(eacl.ValidationUnit).
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WithRole(reqInfo.requestRole).
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WithOperation(reqInfo.operation).
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WithContainerID(reqInfo.cid).
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WithSenderKey(reqInfo.senderKey).
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WithHeaderSource(
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eaclV2.NewMessageHeaderSource(hdrSrcOpts...),
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),
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)
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return action == acl.ActionAllow
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}
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// sourceVerbOfRequest looks for verb in session token and if it is not found,
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// returns reqVerb.
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func sourceVerbOfRequest(req metaWithToken, reqVerb acl.Operation) acl.Operation {
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if req.token != nil {
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switch v := req.token.GetBody().GetContext().(type) {
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case *session.ObjectSessionContext:
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return tokenVerbToOperation(v.GetVerb())
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default:
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// do nothing, return request verb
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}
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}
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return reqVerb
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}
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func tokenVerbToOperation(verb session.ObjectSessionVerb) acl.Operation {
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switch verb {
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case session.ObjectVerbGet:
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return acl.OperationGet
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case session.ObjectVerbPut:
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return acl.OperationPut
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case session.ObjectVerbHead:
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return acl.OperationHead
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case session.ObjectVerbSearch:
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return acl.OperationSearch
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case session.ObjectVerbDelete:
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return acl.OperationDelete
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case session.ObjectVerbRange:
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return acl.OperationRange
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case session.ObjectVerbRangeHash:
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return acl.OperationRangeHash
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default:
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return acl.OperationUnknown
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}
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}
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func (a *accessErr) Error() string {
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return fmt.Sprintf("access to operation %v is denied by %s check", a.operation, a.failedCheckTyp)
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}
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func basicACLErr(info requestInfo) error {
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return &accessErr{
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requestInfo: info,
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failedCheckTyp: "basic ACL",
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}
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|
}
|
|
|
|
func eACLErr(info requestInfo) error {
|
|
return &accessErr{
|
|
requestInfo: info,
|
|
failedCheckTyp: "extended ACL",
|
|
}
|
|
}
|