[#505] ir/container: Check key ownership during set eACL handling

Use NeoFS ID contract client to check if public key from notification event
is tied to the owner of the container for which the eACL is being changed.
Approve changes coming from the owner of the container only.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/innerring/processors/container/process_eacl.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/event/container"
 	"go.uber.org/zap"
 )
@@ -43,9 +44,40 @@ func (cp *Processor) checkSetEACL(e container.SetEACL) error {
 		return errors.New("invalid signature")
 	}
 
-	// TODO: check key ownership
+	// verify the identity of the container owner
+	return cp.checkEACLOwnership(table, key)
+}
 
+func (cp *Processor) checkEACLOwnership(binTable []byte, key *keys.PublicKey) error {
+	// unmarshal table
+	table := eacl.NewTable()
+
+	err := table.Unmarshal(binTable)
+	if err != nil {
+		return fmt.Errorf("invalid binary table: %w", err)
+	}
+
+	// receive owner of the related container
+	cnr, err := cp.cnrClient.Get(table.CID())
+	if err != nil {
+		return fmt.Errorf("could not receive the container: %w", err)
+	}
+
+	ownerID := cnr.OwnerID()
+
+	// check key ownership
+	ownerKeys, err := cp.idClient.AccountKeys(ownerID)
+	if err != nil {
+		return fmt.Errorf("could not received owner keys %s: %w", ownerID, err)
+	}
+
+	for _, ownerKey := range ownerKeys {
+		if ownerKey.Equal(key) {
 			return nil
+		}
+	}
+
+	return fmt.Errorf("key %s is not tied to the owner of the container", key)
 }
 
 func (cp *Processor) approveSetEACL(e container.SetEACL) {

pkg/innerring/processors/container/processor.go

@@ -8,6 +8,7 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/innerring/config"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client/container/wrapper"
+	neofsid "github.com/nspcc-dev/neofs-node/pkg/morph/client/neofsid/wrapper"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
 	containerEvent "github.com/nspcc-dev/neofs-node/pkg/morph/event/container"
 	"github.com/panjf2000/ants/v2"
@@ -29,6 +30,7 @@ type (
 		alphabetState     AlphabetState
 		feeProvider       *config.FeeConfig
 		cnrClient         *wrapper.Wrapper
+		idClient          *neofsid.ClientWrapper
 	}
 
 	// Params of the processor constructor.