[#449] tree: Allow reading requests signed by keys from allow list

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

cmd/frostfs-node/config/tree/config.go

@@ -1,9 +1,11 @@
 package treeconfig
 
 import (
+	"fmt"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 const (
@@ -71,3 +73,22 @@ func (c TreeConfig) ReplicationWorkerCount() int {
 func (c TreeConfig) SyncInterval() time.Duration {
 	return config.DurationSafe(c.cfg, "sync_interval")
 }
+
+// AuthorizedKeys parses and returns an array of "authorized_keys" config
+// parameter from "tree" section.
+//
+// Returns an empty list if not set.
+func (c TreeConfig) AuthorizedKeys() keys.PublicKeys {
+	authorizedKeysStr := config.StringSliceSafe(c.cfg, "authorized_keys")
+	authorizedKeys := make(keys.PublicKeys, 0, len(authorizedKeysStr))
+
+	for i := range authorizedKeysStr {
+		pub, err := keys.NewPublicKeyFromString(authorizedKeysStr[i])
+		if err != nil {
+			panic(fmt.Errorf("could not parse Tree authorized key %s: %w", authorizedKeysStr[i], err))
+		}
+
+		authorizedKeys = append(authorizedKeys, pub)
+	}
+	return authorizedKeys
+}

cmd/frostfs-node/tree.go

@@ -56,6 +56,7 @@ func initTreeService(c *cfg) {
 		tree.WithReplicationTimeout(treeConfig.ReplicationTimeout()),
 		tree.WithReplicationChannelCapacity(treeConfig.ReplicationChannelCapacity()),
 		tree.WithReplicationWorkerCount(treeConfig.ReplicationWorkerCount()),
+		tree.WithAuthorizedKeys(treeConfig.AuthorizedKeys()),
 		tree.WithMetrics(c.metricsCollector.TreeService()))
 
 	for _, srv := range c.cfgGRPC.servers {

pkg/services/tree/options.go

@@ -33,6 +33,7 @@ type cfg struct {
 	replicatorWorkerCount     int
 	replicatorTimeout         time.Duration
 	containerCacheSize        int
+	authorizedKeys            [][]byte
 
 	metrics MetricsRegister
 }
@@ -124,3 +125,14 @@ func WithMetrics(v MetricsRegister) Option {
 		c.metrics = v
 	}
 }
+
+// WithAuthorizedKeys returns option to add list of public
+// keys that have rights to use Tree service.
+func WithAuthorizedKeys(keys keys.PublicKeys) Option {
+	return func(c *cfg) {
+		c.authorizedKeys = nil
+		for _, key := range keys {
+			c.authorizedKeys = append(c.authorizedKeys, key.Bytes())
+		}
+	}
+}

pkg/services/tree/signature.go

@@ -51,6 +51,21 @@ func (s *Service) verifyClient(req message, cid cidSDK.ID, rawBearer []byte, op
 	if err != nil {
 		return err
 	}
+	if op == acl.OpObjectGet {
+		// verify if the request for a client operation
+		// was signed by a key from authorized list.
+		// Operation must be one of READ.
+		sign := req.GetSignature()
+		if sign == nil {
+			return errors.New("missing signature")
+		}
+		var key = sign.GetKey()
+		for i := range s.authorizedKeys {
+			if bytes.Equal(s.authorizedKeys[i], key) {
+				return nil
+			}
+		}
+	}
 
 	cnr, err := s.cnrSource.Get(cid)
 	if err != nil {