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acl.go
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acl.go
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package acl
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
acl "github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-api-go/pkg/owner"
"github.com/nspcc-dev/neofs-api-go/util/signature"
bearer "github.com/nspcc-dev/neofs-api-go/v2/acl"
"github.com/nspcc-dev/neofs-api-go/v2/object"
"github.com/nspcc-dev/neofs-api-go/v2/refs"
"github.com/nspcc-dev/neofs-api-go/v2/session"
v2signature "github.com/nspcc-dev/neofs-api-go/v2/signature"
core "github.com/nspcc-dev/neofs-node/pkg/core/container"
"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
"github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl"
eaclV2 "github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl/v2"
)
type (
// Service checks basic ACL rules.
Service struct {
*cfg
}
putStreamBasicChecker struct {
source *Service
next objectSvc.PutObjectStream
*eACLCfg
}
getStreamBasicChecker struct {
objectSvc.GetObjectStream
info requestInfo
*eACLCfg
}
rangeStreamBasicChecker struct {
objectSvc.GetObjectRangeStream
info requestInfo
*eACLCfg
}
searchStreamBasicChecker struct {
objectSvc.SearchStream
info requestInfo
*eACLCfg
}
requestInfo struct {
basicACL basicACLHelper
requestRole acl.Role
isInnerRing bool
operation acl.Operation // put, get, head, etc.
cnrOwner *owner.ID // container owner
cid *cid.ID
oid *objectSDK.ID
senderKey []byte
bearer *bearer.BearerToken // bearer token of request
srcRequest interface{}
}
)
// Option represents Service constructor option.
type Option func(*cfg)
type cfg struct {
containers core.Source
sender SenderClassifier
next objectSvc.ServiceServer
*eACLCfg
}
type eACLCfg struct {
eACLOpts []eacl.Option
eACL *eacl.Validator
localStorage *engine.StorageEngine
state netmap.State
}
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 &cfg{
eACLCfg: new(eACLCfg),
}
}
// New is a constructor for object ACL checking service.
func New(opts ...Option) Service {
cfg := defaultCfg()
for i := range opts {
opts[i](cfg)
}
cfg.eACL = eacl.NewValidator(cfg.eACLOpts...)
return Service{
cfg: cfg,
}
}
func (b Service) Get(request *object.GetRequest, stream objectSvc.GetObjectStream) error {
cid, err := getContainerIDFromRequest(request)
if err != nil {
return err
}
sTok := originalSessionToken(request.GetMetaHeader())
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: sTok,
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := b.findRequestInfo(req, cid, acl.OperationGet)
if err != nil {
return err
}
reqInfo.oid = getObjectIDFromRequestBody(request.GetBody())
useObjectIDFromSession(&reqInfo, sTok)
if !basicACLCheck(reqInfo) {
return basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
return eACLErr(reqInfo)
}
return b.next.Get(request, &getStreamBasicChecker{
GetObjectStream: stream,
info: reqInfo,
eACLCfg: b.eACLCfg,
})
}
func (b Service) Put(ctx context.Context) (objectSvc.PutObjectStream, error) {
streamer, err := b.next.Put(ctx)
return putStreamBasicChecker{
source: &b,
next: streamer,
eACLCfg: b.eACLCfg,
}, err
}
func (b Service) Head(
ctx context.Context,
request *object.HeadRequest) (*object.HeadResponse, error) {
cid, err := getContainerIDFromRequest(request)
if err != nil {
return nil, err
}
sTok := originalSessionToken(request.GetMetaHeader())
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: sTok,
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := b.findRequestInfo(req, cid, acl.OperationHead)
if err != nil {
return nil, err
}
reqInfo.oid = getObjectIDFromRequestBody(request.GetBody())
useObjectIDFromSession(&reqInfo, sTok)
if !basicACLCheck(reqInfo) {
return nil, basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
return nil, eACLErr(reqInfo)
}
resp, err := b.next.Head(ctx, request)
if err == nil {
if !eACLCheck(resp, reqInfo, b.eACLCfg) {
err = eACLErr(reqInfo)
}
}
return resp, err
}
func (b Service) Search(request *object.SearchRequest, stream objectSvc.SearchStream) error {
var id *cid.ID
id, err := getContainerIDFromRequest(request)
if err != nil {
return err
}
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: originalSessionToken(request.GetMetaHeader()),
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := b.findRequestInfo(req, id, acl.OperationSearch)
if err != nil {
return err
}
reqInfo.oid = getObjectIDFromRequestBody(request.GetBody())
if !basicACLCheck(reqInfo) {
return basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
return eACLErr(reqInfo)
}
return b.next.Search(request, &searchStreamBasicChecker{
SearchStream: stream,
info: reqInfo,
eACLCfg: b.eACLCfg,
})
}
func (b Service) Delete(
ctx context.Context,
request *object.DeleteRequest) (*object.DeleteResponse, error) {
cid, err := getContainerIDFromRequest(request)
if err != nil {
return nil, err
}
sTok := originalSessionToken(request.GetMetaHeader())
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: sTok,
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := b.findRequestInfo(req, cid, acl.OperationDelete)
if err != nil {
return nil, err
}
reqInfo.oid = getObjectIDFromRequestBody(request.GetBody())
useObjectIDFromSession(&reqInfo, sTok)
if !basicACLCheck(reqInfo) {
return nil, basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
return nil, eACLErr(reqInfo)
}
return b.next.Delete(ctx, request)
}
func (b Service) GetRange(request *object.GetRangeRequest, stream objectSvc.GetObjectRangeStream) error {
cid, err := getContainerIDFromRequest(request)
if err != nil {
return err
}
sTok := originalSessionToken(request.GetMetaHeader())
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: sTok,
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := b.findRequestInfo(req, cid, acl.OperationRange)
if err != nil {
return err
}
reqInfo.oid = getObjectIDFromRequestBody(request.GetBody())
useObjectIDFromSession(&reqInfo, sTok)
if !basicACLCheck(reqInfo) {
return basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
return eACLErr(reqInfo)
}
return b.next.GetRange(request, &rangeStreamBasicChecker{
GetObjectRangeStream: stream,
info: reqInfo,
eACLCfg: b.eACLCfg,
})
}
func (b Service) GetRangeHash(
ctx context.Context,
request *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
cid, err := getContainerIDFromRequest(request)
if err != nil {
return nil, err
}
sTok := originalSessionToken(request.GetMetaHeader())
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: sTok,
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := b.findRequestInfo(req, cid, acl.OperationRangeHash)
if err != nil {
return nil, err
}
reqInfo.oid = getObjectIDFromRequestBody(request.GetBody())
useObjectIDFromSession(&reqInfo, sTok)
if !basicACLCheck(reqInfo) {
return nil, basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
return nil, eACLErr(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
}
sTok := part.GetHeader().GetSessionToken()
req := metaWithToken{
vheader: request.GetVerificationHeader(),
token: sTok,
bearer: originalBearerToken(request.GetMetaHeader()),
src: request,
}
reqInfo, err := p.source.findRequestInfo(req, cid, acl.OperationPut)
if err != nil {
return err
}
reqInfo.oid = getObjectIDFromRequestBody(part)
useObjectIDFromSession(&reqInfo, sTok)
if !basicACLCheck(reqInfo) || !stickyBitCheck(reqInfo, ownerID) {
return basicACLErr(reqInfo)
} else if !eACLCheck(request, reqInfo, p.eACLCfg) {
return eACLErr(reqInfo)
}
}
return p.next.Send(request)
}
func (p putStreamBasicChecker) CloseAndRecv() (*object.PutResponse, error) {
return p.next.CloseAndRecv()
}
func (g *getStreamBasicChecker) Send(resp *object.GetResponse) error {
if _, ok := resp.GetBody().GetObjectPart().(*object.GetObjectPartInit); ok {
if !eACLCheck(resp, g.info, g.eACLCfg) {
return eACLErr(g.info)
}
}
return g.GetObjectStream.Send(resp)
}
func (g *rangeStreamBasicChecker) Send(resp *object.GetRangeResponse) error {
if !eACLCheck(resp, g.info, g.eACLCfg) {
return eACLErr(g.info)
}
return g.GetObjectRangeStream.Send(resp)
}
func (g *searchStreamBasicChecker) Send(resp *object.SearchResponse) error {
if !eACLCheck(resp, g.info, g.eACLCfg) {
return eACLErr(g.info)
}
return g.SearchStream.Send(resp)
}
func (b Service) findRequestInfo(
req metaWithToken,
cid *cid.ID,
op acl.Operation) (info requestInfo, err error) {
cnr, err := b.containers.Get(cid) // fetch actual container
if err != nil || cnr.OwnerID() == nil {
return info, ErrUnknownContainer
}
// find request role and key
role, isIR, key, err := b.sender.Classify(req, cid, cnr)
if err != nil {
return info, err
}
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.BasicACL())
info.requestRole = role
info.isInnerRing = isIR
info.operation = verb
info.cnrOwner = cnr.OwnerID()
info.cid = cid
// it is assumed that at the moment the key will be valid,
// otherwise the request would not pass validation
info.senderKey = key
// add bearer token if it is present in request
info.bearer = req.bearer
info.srcRequest = req.src
return info, nil
}
func getContainerIDFromRequest(req interface{}) (id *cid.ID, err error) {
switch v := req.(type) {
case *object.GetRequest:
return cid.NewFromV2(v.GetBody().GetAddress().GetContainerID()), nil
case *object.PutRequest:
objPart := v.GetBody().GetObjectPart()
if part, ok := objPart.(*object.PutObjectPartInit); ok {
return cid.NewFromV2(part.GetHeader().GetContainerID()), nil
}
return nil, errors.New("can't get cid in chunk")
case *object.HeadRequest:
return cid.NewFromV2(v.GetBody().GetAddress().GetContainerID()), nil
case *object.SearchRequest:
return cid.NewFromV2(v.GetBody().GetContainerID()), nil
case *object.DeleteRequest:
return cid.NewFromV2(v.GetBody().GetAddress().GetContainerID()), nil
case *object.GetRangeRequest:
return cid.NewFromV2(v.GetBody().GetAddress().GetContainerID()), nil
case *object.GetRangeHashRequest:
return cid.NewFromV2(v.GetBody().GetAddress().GetContainerID()), nil
default:
return nil, errors.New("unknown request type")
}
}
func useObjectIDFromSession(req *requestInfo, token *session.SessionToken) {
if token == nil {
return
}
objCtx, ok := token.GetBody().GetContext().(*session.ObjectSessionContext)
if !ok {
return
}
req.oid = objectSDK.NewIDFromV2(
objCtx.GetAddress().GetObjectID(),
)
}
func getObjectIDFromRequestBody(body interface{}) *objectSDK.ID {
switch v := body.(type) {
default:
return nil
case interface {
GetObjectID() *refs.ObjectID
}:
return objectSDK.NewIDFromV2(v.GetObjectID())
case interface {
GetAddress() *refs.Address
}:
return objectSDK.NewIDFromV2(v.GetAddress().GetObjectID())
}
}
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
}
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
}
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
if info.isInnerRing {
checkFn = info.basicACL.InnerRingAllowed
}
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 || len(info.senderKey) == 0 {
return false
}
if !info.basicACL.Sticky() {
return true
}
requestSenderKey := unmarshalPublicKey(info.senderKey)
return isOwnerFromKey(owner, requestSenderKey)
}
func eACLCheck(msg interface{}, reqInfo requestInfo, cfg *eACLCfg) bool {
if reqInfo.basicACL.Final() {
return true
}
// if bearer token is not allowed, then ignore it
if !reqInfo.basicACL.BearerAllowed(reqInfo.operation) {
reqInfo.bearer = nil
}
// if bearer token is not present, isValidBearer returns true
if !isValidBearer(reqInfo, cfg.state) {
return false
}
hdrSrcOpts := make([]eaclV2.Option, 0, 3)
addr := objectSDK.NewAddress()
addr.SetContainerID(reqInfo.cid)
addr.SetObjectID(reqInfo.oid)
hdrSrcOpts = append(hdrSrcOpts,
eaclV2.WithLocalObjectStorage(cfg.localStorage),
eaclV2.WithAddress(addr.ToV2()),
)
if req, ok := msg.(eaclV2.Request); ok {
hdrSrcOpts = append(hdrSrcOpts, eaclV2.WithServiceRequest(req))
} else {
hdrSrcOpts = append(hdrSrcOpts,
eaclV2.WithServiceResponse(
msg.(eaclV2.Response),
reqInfo.srcRequest.(eaclV2.Request),
),
)
}
action := cfg.eACL.CalculateAction(new(eacl.ValidationUnit).
WithRole(reqInfo.requestRole).
WithOperation(reqInfo.operation).
WithContainerID(reqInfo.cid).
WithSenderKey(reqInfo.senderKey).
WithHeaderSource(
eaclV2.NewMessageHeaderSource(hdrSrcOpts...),
).
WithBearerToken(reqInfo.bearer),
)
return action == acl.ActionAllow
}
// 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",
}
}
func eACLErr(info requestInfo) error {
return &accessErr{
requestInfo: info,
failedCheckTyp: "extended ACL",
}
}
// isValidBearer returns true if bearer token correctly signed by authorized
// entity. This method might be define on whole ACL service because it will
// require to fetch current epoch to check lifetime.
func isValidBearer(reqInfo requestInfo, st netmap.State) bool {
token := reqInfo.bearer
// 0. Check if bearer token is present in reqInfo. It might be non nil
// empty structure.
if token == nil || (token.GetBody() == nil && token.GetSignature() == nil) {
return true
}
// 1. First check token lifetime. Simplest verification.
if !isValidLifetime(token.GetBody().GetLifetime(), st.CurrentEpoch()) {
return false
}
// 2. Then check if bearer token is signed correctly.
signWrapper := v2signature.StableMarshalerWrapper{SM: token.GetBody()}
if err := signature.VerifyDataWithSource(signWrapper, func() (key, sig []byte) {
tokenSignature := token.GetSignature()
return tokenSignature.GetKey(), tokenSignature.GetSign()
}); err != nil {
return false // invalid signature
}
// 3. Then check if container owner signed this token.
tokenIssuerKey := unmarshalPublicKey(token.GetSignature().GetKey())
if !isOwnerFromKey(reqInfo.cnrOwner, tokenIssuerKey) {
// todo: in this case we can issue all owner keys from neofs.id and check once again
return false
}
// 4. Then check if request sender has rights to use this token.
tokenOwnerField := owner.NewIDFromV2(token.GetBody().GetOwnerID())
if tokenOwnerField != nil { // see bearer token owner field description
requestSenderKey := unmarshalPublicKey(reqInfo.senderKey)
if !isOwnerFromKey(tokenOwnerField, requestSenderKey) {
// todo: in this case we can issue all owner keys from neofs.id and check once again
return false
}
}
return true
}
func isValidLifetime(lifetime *bearer.TokenLifetime, epoch uint64) bool {
// The "exp" (expiration time) claim identifies the expiration time on
// or after which the JWT MUST NOT be accepted for processing.
// The "nbf" (not before) claim identifies the time before which the JWT
// MUST NOT be accepted for processing
// RFC 7519 sections 4.1.4, 4.1.5
return epoch >= lifetime.GetNbf() && epoch <= lifetime.GetExp()
}
func isOwnerFromKey(id *owner.ID, key *keys.PublicKey) bool {
if id == nil || key == nil {
return false
}
wallet, err := owner.NEO3WalletFromPublicKey((*ecdsa.PublicKey)(key))
if err != nil {
return false
}
return id.Equal(owner.NewIDFromNeo3Wallet(wallet))
}
// originalBearerToken goes down to original request meta header and fetches
// bearer token from there.
func originalBearerToken(header *session.RequestMetaHeader) *bearer.BearerToken {
for header.GetOrigin() != nil {
header = header.GetOrigin()
}
return header.GetBearerToken()
}
// originalSessionToken goes down to original request meta header and fetches
// session token from there.
func originalSessionToken(header *session.RequestMetaHeader) *session.SessionToken {
for header.GetOrigin() != nil {
header = header.GetOrigin()
}
return header.GetSessionToken()
}