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