[#770] object: Introduce ape chain checker for object svc

* Introduce Request type converted from RequestInfo type
  to implement policy-engine's Request interface
* Implement basic ape checker to check if a request is
  permitted to be performed
* Make put handlers use APE checker instead EACL

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

cmd/frostfs-node/object.go

@@ -426,6 +426,7 @@ func createACLServiceV2(c *cfg, splitSvc *objectService.TransportSplitter, irFet
 			c.cfgObject.eaclSource,
 			eaclSDK.NewValidator(),
 			ls),
+		acl.NewAPEChecker(c.log, c.cfgObject.apeChainSource),
 		c.cfgObject.cnrSource,
 		v2.WithLogger(c.log),
 	)

cmd/frostfs-node/policy_engine.go

@@ -1,12 +1,15 @@
 package main
 
 import (
+	"sync"
+
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	policyengine "git.frostfs.info/TrueCloudLab/policy-engine"
 )
 
 type apeChainSourceImpl struct {
+	mtx               sync.Mutex
 	localChainStorage map[cid.ID]policyengine.CachedChainStorage
 }
 
@@ -19,6 +22,9 @@ func NewAPESource() container.AccessPolicyEngineChainSource {
 var _ container.AccessPolicyEngineChainSource = (*apeChainSourceImpl)(nil)
 
 func (c *apeChainSourceImpl) GetChainSource(cid cid.ID) (policyengine.CachedChainStorage, error) {
+	c.mtx.Lock()
+	defer c.mtx.Unlock()
+
 	s, ok := c.localChainStorage[cid]
 	if ok {
 		return s, nil

pkg/services/object/acl/ape.go

@@ -0,0 +1,56 @@
+package acl
+
+import (
+	"errors"
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
+	v2 "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/acl/v2"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	policyengine "git.frostfs.info/TrueCloudLab/policy-engine"
+)
+
+var (
+	errAPEChainNoSource = errors.New("could not get ape chain source for the container")
+)
+
+type apeCheckerImpl struct {
+	log    *logger.Logger
+	apeSrc container.AccessPolicyEngineChainSource
+}
+
+func NewAPEChecker(log *logger.Logger, apeSrc container.AccessPolicyEngineChainSource) v2.APEChainChecker {
+	return &apeCheckerImpl{
+		log:    log,
+		apeSrc: apeSrc,
+	}
+}
+
+func (c *apeCheckerImpl) CheckIfRequestPermitted(reqInfo v2.RequestInfo) error {
+	cnr := reqInfo.ContainerID()
+
+	chainCache, err := c.apeSrc.GetChainSource(cnr)
+	if err != nil {
+		return errAPEChainNoSource
+	}
+
+	request := new(Request)
+	request.FromRequestInfo(reqInfo)
+
+	status, ruleFound := chainCache.IsAllowed(policyengine.Ingress, "", request)
+
+	if !ruleFound || status == policyengine.Allow {
+		return nil
+	}
+
+	return apeErr(reqInfo, status)
+}
+
+const accessDeniedAPEReasonFmt = "access to operation %s is denied by access policy engine: %s"
+
+func apeErr(req v2.RequestInfo, status policyengine.Status) error {
+	errAccessDenied := &apistatus.ObjectAccessDenied{}
+	errAccessDenied.WriteReason(fmt.Sprintf(accessDeniedAPEReasonFmt, req.Operation(), status.String()))
+	return errAccessDenied
+}

pkg/services/object/acl/ape_request.go

@@ -0,0 +1,105 @@
+package acl
+
+import (
+	"fmt"
+
+	v2 "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/acl/v2"
+	aclSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/acl"
+	policyengine "git.frostfs.info/TrueCloudLab/policy-engine"
+)
+
+type Request struct {
+	operation  string
+	resource   *resource
+	properties map[string]string
+}
+
+var _ policyengine.Request = (*Request)(nil)
+
+type resource struct {
+	name       string
+	properties map[string]string
+}
+
+var _ policyengine.Resource = (*resource)(nil)
+
+func (r *resource) Name() string {
+	return r.name
+}
+
+func (r *resource) Property(key string) string {
+	return r.properties[key]
+}
+
+// TODO (aarifullin): these stringified verbs, properties and namespaces
+// should be non-implementation-specific.
+func getResource(reqInfo v2.RequestInfo) *resource {
+	cid := reqInfo.ContainerID()
+	oid := "*"
+	if reqOID := reqInfo.ObjectID(); reqOID != nil {
+		oid = reqOID.EncodeToString()
+	}
+	name := fmt.Sprintf("native:::object/%s/%s",
+		cid,
+		oid)
+
+	return &resource{
+		name:       name,
+		properties: make(map[string]string),
+	}
+}
+
+func getProperties(_ v2.RequestInfo) map[string]string {
+	return map[string]string{
+		"Actor": "",
+	}
+}
+
+// TODO (aarifullin): these stringified verbs, properties and namespaces
+// should be non-implementation-specific.
+func getOperation(reqInfo v2.RequestInfo) string {
+	var verb string
+	switch op := reqInfo.Operation(); op {
+	case aclSDK.OpObjectGet:
+		verb = "GetObject"
+	case aclSDK.OpObjectHead:
+		verb = "HeadObject"
+	case aclSDK.OpObjectPut:
+		verb = "PutObject"
+	case aclSDK.OpObjectDelete:
+		verb = "DeleteObject"
+	case aclSDK.OpObjectSearch:
+		verb = "SearchObject"
+	case aclSDK.OpObjectRange:
+		verb = "RangeObject"
+	case aclSDK.OpObjectHash:
+		verb = "HashObject"
+	}
+
+	return "native:" + verb
+}
+
+func NewRequest() *Request {
+	return &Request{
+		resource:   new(resource),
+		properties: map[string]string{},
+	}
+}
+
+func (r *Request) FromRequestInfo(ri v2.RequestInfo) {
+	r.operation = getOperation(ri)
+	r.resource = getResource(ri)
+	r.properties = getProperties(ri)
+}
+
+func (r *Request) Operation() string {
+	return r.operation
+}
+
+func (r *Request) Property(key string) string {
+	return r.properties[key]
+}
+
+func (r *Request) Resource() policyengine.Resource {
+	return r.resource
+}

pkg/services/object/acl/v2/service.go

@@ -67,6 +67,10 @@ type cfg struct {
 
 	checker ACLChecker
 
+	// TODO(aarifullin): apeCheck is temporarily the part of
+	// acl service and must be standalone.
+	apeChecker APEChainChecker
+
 	irFetcher InnerRingFetcher
 
 	nm netmap.Source
@@ -79,6 +83,7 @@ func New(next object.ServiceServer,
 	nm netmap.Source,
 	irf InnerRingFetcher,
 	acl ACLChecker,
+	apeChecker APEChainChecker,
 	cs container.Source,
 	opts ...Option,
 ) Service {
@@ -88,6 +93,7 @@ func New(next object.ServiceServer,
 		nm:         nm,
 		irFetcher:  irf,
 		checker:    acl,
+		apeChecker: apeChecker,
 		containers: cs,
 	}
 
@@ -212,10 +218,8 @@ func (b Service) Head(
 
 	reqInfo.obj = obj
 
-	if !b.checker.CheckBasicACL(reqInfo) {
-		return nil, basicACLErr(reqInfo)
-	} else if err := b.checker.CheckEACL(request, reqInfo); err != nil {
-		return nil, eACLErr(reqInfo, err)
+	if err := b.apeChecker.CheckIfRequestPermitted(reqInfo); err != nil {
+		return nil, err
 	}
 
 	resp, err := b.next.Head(ctx, request)
@@ -560,10 +564,8 @@ func (p putStreamBasicChecker) Send(ctx context.Context, request *objectV2.PutRe
 
 		reqInfo.obj = obj
 
-		if !p.source.checker.CheckBasicACL(reqInfo) || !p.source.checker.StickyBitCheck(reqInfo, idOwner) {
-			return basicACLErr(reqInfo)
-		} else if err := p.source.checker.CheckEACL(request, reqInfo); err != nil {
-			return eACLErr(reqInfo, err)
+		if err := p.source.apeChecker.CheckIfRequestPermitted(reqInfo); err != nil {
+			return err
 		}
 	}
 

pkg/services/object/acl/v2/types.go

@@ -26,3 +26,9 @@ type InnerRingFetcher interface {
 	// the actual inner ring.
 	InnerRingKeys() ([][]byte, error)
 }
+
+// APEChainChecker is the interface that provides methods to
+// check if the access policy engine permits to perform the request.
+type APEChainChecker interface {
+	CheckIfRequestPermitted(RequestInfo) error
+}