[#259] Support contract based policies

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

CHANGELOG.md

@@ -20,6 +20,7 @@ This document outlines major changes between releases.
 - Support control api to manage policies. See `control` config section (#258)
 - Add `namespace` label to billing metrics (#271)
 - Support policy-engine (#257)
+- Support `policy` contract (#259)
 
 ### Changed
 - Generalise config param `use_default_xmlns_for_complete_multipart` to `use_default_xmlns` so that use default xmlns for all requests (#221)

api/cache/policy.go

@@ -0,0 +1,72 @@
+package cache
+
+import (
+	"fmt"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
+	"github.com/bluele/gcache"
+	"go.uber.org/zap"
+)
+
+// MorphPolicyCache provides lru cache for listing policies stored in policy contract.
+type MorphPolicyCache struct {
+	cache  gcache.Cache
+	logger *zap.Logger
+}
+
+type MorphPolicyCacheKey struct {
+	Target engine.Target
+	Name   chain.Name
+}
+
+const (
+	// DefaultMorphPolicyCacheSize is a default maximum number of entries in cache.
+	DefaultMorphPolicyCacheSize = 1e4
+	// DefaultMorphPolicyCacheLifetime is a default lifetime of entries in cache.
+	DefaultMorphPolicyCacheLifetime = time.Minute
+)
+
+// DefaultMorphPolicyConfig returns new default cache expiration values.
+func DefaultMorphPolicyConfig(logger *zap.Logger) *Config {
+	return &Config{
+		Size:     DefaultMorphPolicyCacheSize,
+		Lifetime: DefaultMorphPolicyCacheLifetime,
+		Logger:   logger,
+	}
+}
+
+// NewMorphPolicyCache creates an object of MorphPolicyCache.
+func NewMorphPolicyCache(config *Config) *MorphPolicyCache {
+	gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
+	return &MorphPolicyCache{cache: gc, logger: config.Logger}
+}
+
+// Get returns a cached object. Returns nil if value is missing.
+func (o *MorphPolicyCache) Get(key MorphPolicyCacheKey) []*chain.Chain {
+	entry, err := o.cache.Get(key)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.([]*chain.Chain)
+	if !ok {
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
+			zap.String("expected", fmt.Sprintf("%T", result)))
+		return nil
+	}
+
+	return result
+}
+
+// Put puts an object to cache.
+func (o *MorphPolicyCache) Put(key MorphPolicyCacheKey, list []*chain.Chain) error {
+	return o.cache.Set(key, list)
+}
+
+// Delete deletes an object from cache.
+func (o *MorphPolicyCache) Delete(key MorphPolicyCacheKey) bool {
+	return o.cache.Remove(key)
+}

api/middleware/policy.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	apiErr "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/policy"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
@@ -51,7 +52,7 @@ func policyCheck(storage engine.ChainRouter, settings PolicySettings, domains []
 
 	reqInfo := GetReqInfo(r.Context())
 	target := engine.NewRequestTargetWithNamespace(settings.ResolveNamespaceAlias(reqInfo.Namespace))
-	st, found, err := storage.IsAllowed(chain.Ingress, target, req)
+	st, found, err := storage.IsAllowed(policy.S3ChainName, target, req)
 	if err != nil {
 		return 0, err
 	}

api/router_test.go

@@ -13,6 +13,7 @@ import (
 
 	apiErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	s3middleware "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/policy"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
@@ -164,7 +165,7 @@ func TestPolicyChecker(t *testing.T) {
 		}},
 	}
 
-	err := chiRouter.cfg.PolicyStorage.MorphRuleChainStorage().AddMorphRuleChain(chain.Ingress, engine.NamespaceTarget(namespace), ruleChain)
+	err := chiRouter.cfg.PolicyStorage.MorphRuleChainStorage().AddMorphRuleChain(policy.S3ChainName, engine.NamespaceTarget(namespace), ruleChain)
 	require.NoError(t, err)
 
 	// check we can access 'bucket' in default namespace

cmd/s3-gw/app.go

@@ -30,6 +30,8 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/resolver"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/frostfsid"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/policy"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/policy/contract"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/services"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
@@ -144,6 +146,7 @@ func newApp(ctx context.Context, log *Logger, v *viper.Viper) *App {
 func (a *App) init(ctx context.Context) {
 	a.setRuntimeParameters()
 	a.initAPI(ctx)
+	a.initPolicyStorage(ctx)
 	a.initControlAPI()
 	a.initMetrics()
 	a.initFrostfsID(ctx)
@@ -271,10 +274,10 @@ func (s *appSettings) DefaultPlacementPolicy(namespace string) netmap.PlacementP
 
 func (s *appSettings) PlacementPolicy(namespace, constraint string) (netmap.PlacementPolicy, bool) {
 	s.mu.RLock()
-	policy, ok := s.namespaces[namespace].LocationConstraints[constraint]
+	placementPolicy, ok := s.namespaces[namespace].LocationConstraints[constraint]
 	s.mu.RUnlock()
 
-	return policy, ok
+	return placementPolicy, ok
 }
 
 func (s *appSettings) CopiesNumbers(namespace, constraint string) ([]uint32, bool) {
@@ -417,12 +420,10 @@ func (a *App) initAPI(ctx context.Context) {
 }
 
 func (a *App) initControlAPI() {
-	a.policyStorage = inmemory.NewInMemoryLocalOverrides()
-
 	svc := controlSvc.New(
 		controlSvc.WithSettings(a.settings),
 		controlSvc.WithLogger(a.log),
-		controlSvc.WithChainStorage(a.policyStorage),
+		controlSvc.WithChainStorage(a.policyStorage.LocalStorage()),
 	)
 
 	a.controlAPI = grpc.NewServer()
@@ -451,6 +452,30 @@ func (a *App) initFrostfsID(ctx context.Context) {
 	}
 }
 
+func (a *App) initPolicyStorage(ctx context.Context) {
+	if !a.cfg.GetBool(cfgPolicyEnabled) {
+		a.policyStorage = inmemory.NewInMemoryLocalOverrides()
+		return
+	}
+
+	policyClient, err := contract.New(ctx, contract.Config{
+		RPCAddress: a.cfg.GetString(cfgRPCEndpoint),
+		Contract:   a.cfg.GetString(cfgPolicyContract),
+		Key:        a.key,
+	})
+	if err != nil {
+		a.log.Fatal(logs.InitPolicyContractFailed, zap.Error(err))
+	}
+
+	cachedMorph := policy.NewCachedMorph(policy.CachedMorphConfig{
+		Morph: policyClient,
+		Cache: cache.NewMorphPolicyCache(getMorphPolicyCacheConfig(a.cfg, a.log)),
+		Log:   a.log,
+	})
+
+	a.policyStorage = policy.NewStorage(cachedMorph)
+}
+
 func (a *App) initResolver() {
 	var err error
 	a.bucketResolver, err = resolver.NewBucketResolver(a.getResolverOrder(), a.getResolverConfig())
@@ -919,6 +944,15 @@ func getAccessBoxCacheConfig(v *viper.Viper, l *zap.Logger) *cache.Config {
 	return cacheCfg
 }
 
+func getMorphPolicyCacheConfig(v *viper.Viper, l *zap.Logger) *cache.Config {
+	cacheCfg := cache.DefaultMorphPolicyConfig(l)
+
+	cacheCfg.Lifetime = fetchCacheLifetime(v, l, cfgMorphPolicyCacheLifetime, cacheCfg.Lifetime)
+	cacheCfg.Size = fetchCacheSize(v, l, cfgMorphPolicyCacheSize, cacheCfg.Size)
+
+	return cacheCfg
+}
+
 func (a *App) initHandler() {
 	var err error
 	a.api, err = handler.New(a.log, a.obj, a.nc, a.settings)

cmd/s3-gw/app_settings.go

@@ -108,6 +108,8 @@ const ( // Settings.
 	cfgAccessBoxCacheSize         = "cache.accessbox.size"
 	cfgAccessControlCacheLifetime = "cache.accesscontrol.lifetime"
 	cfgAccessControlCacheSize     = "cache.accesscontrol.size"
+	cfgMorphPolicyCacheLifetime   = "cache.morph_policy.lifetime"
+	cfgMorphPolicyCacheSize       = "cache.morph_policy.size"
 
 	// NATS.
 	cfgEnableNATS             = "nats.enabled"
@@ -207,6 +209,10 @@ const ( // Settings.
 	cfgFrostfsIDEnabled  = "frostfsid.enabled"
 	cfgFrostfsIDContract = "frostfsid.contract"
 
+	// Policy.
+	cfgPolicyEnabled  = "policy.enabled"
+	cfgPolicyContract = "policy.contract"
+
 	// envPrefix is an environment variables prefix used for configuration.
 	envPrefix = "S3_GW"
 )
@@ -689,6 +695,10 @@ func newSettings() *viper.Viper {
 	v.SetDefault(cfgFrostfsIDContract, "frostfsid.frostfs")
 	v.SetDefault(cfgFrostfsIDEnabled, true)
 
+	// policy
+	v.SetDefault(cfgPolicyContract, "policy.frostfs")
+	v.SetDefault(cfgPolicyEnabled, true)
+
 	// resolve
 	v.SetDefault(cfgResolveNamespaceHeader, defaultNamespaceHeader)
 

config/config.env

@@ -97,6 +97,9 @@ S3_GW_CACHE_ACCESSBOX_SIZE=100
 # Cache which stores owner to cache operation mapping
 S3_GW_CACHE_ACCESSCONTROL_LIFETIME=1m
 S3_GW_CACHE_ACCESSCONTROL_SIZE=100000
+# Cache which stores list of policy chains
+S3_GW_CACHE_MORPH_POLICY_LIFETIME=1m
+S3_GW_CACHE_MORPH_POLICY_SIZE=10000
 
 # NATS
 S3_GW_NATS_ENABLED=true
@@ -195,6 +198,12 @@ S3_GW_FROSTFSID_ENABLED=true
 # FrostfsID contract hash (LE) or name in NNS.
 S3_GW_FROSTFSID_CONTRACT=frostfsid.frostfs
 
+# Policy contract configuration. To enable this functionality the `rpc_endpoint` param must be also set.
+# Enables using policies from Policy contract.
+S3_GW_POLICY_ENABLED=true
+# Policy contract hash (LE) or name in NNS.
+S3_GW_POLICY_CONTRACT=policy.frostfs
+
 # Namespaces configuration
 S3_GW_NAMESPACES_CONFIG=namespaces.json
 

config/config.yaml

@@ -120,6 +120,10 @@ cache:
   accesscontrol:
     lifetime: 1m
     size: 100000
+  # Cache which stores list of policy chains
+  morph_policy:
+    lifetime: 1m
+    size: 10000
 
 nats:
   enabled: true
@@ -229,5 +233,12 @@ frostfsid:
   # FrostfsID contract hash (LE) or name in NNS.
   contract: frostfsid.frostfs
 
+# Policy contract configuration. To enable this functionality the `rpc_endpoint` param must be also set.
+policy:
+  # Enables using policies from Policy contract.
+  enabled: true
+  # Policy contract hash (LE) or name in NNS.
+  contract: policy.frostfs
+
 namespaces:
   config: namespaces.json

docs/configuration.md

@@ -190,6 +190,7 @@ There are some custom types used for brevity:
 | `features`         | [Features configuration](#features-section)                    |
 | `web`              | [Web server configuration](#web-section)                       |
 | `frostfsid`        | [FrostfsID configuration](#frostfsid-section)                  |
+| `policy`           | [Policy contract configuration](#policy-section)               |
 | `namespaces`       | [Namespaces configuration](#namespaces-section)                |
 
 ### General section
@@ -409,6 +410,9 @@ cache:
   accesscontrol:
     lifetime: 1m
     size: 100000
+  morph_policy:
+    lifetime: 30s
+    size: 10000
 ```
 
 | Parameter       | Type                              | Default value                     | Description                                                                            |
@@ -420,6 +424,7 @@ cache:
 | `system`        | [Cache config](#cache-subsection) | `lifetime: 5m`<br>`size: 10000`   | Cache for system objects in a bucket: bucket settings, notification configuration etc. |
 | `accessbox`     | [Cache config](#cache-subsection) | `lifetime: 10m`<br>`size: 100`    | Cache which stores access box with tokens by its address.                              |
 | `accesscontrol` | [Cache config](#cache-subsection) | `lifetime: 1m`<br>`size: 100000`  | Cache which stores owner to cache operation mapping.                                   |
+| `morph_policy`  | [Cache config](#cache-subsection) | `lifetime: 1m`<br>`size: 10000`   | Cache which stores list of policy chains.                                              |
 
 #### `cache` subsection
 
@@ -641,6 +646,21 @@ frostfsid:
 | `enabled`  | `bool`   | no            | true              | Enables check that allow requests only users that is registered in FrostfsID contract. |
 | `contract` | `string` | no            | frostfsid.frostfs | FrostfsID contract hash (LE) or name in NNS.                                           |
 
+# `policy` section
+
+Policy contract configuration. To enable this functionality the `rpc_endpoint` param must be also set.
+
+```yaml
+policy:
+  enabled: false
+  contract: policy.frostfs
+```
+
+| Parameter  | Type     | SIGHUP reload | Default value  | Description                                                       |
+|------------|----------|---------------|----------------|-------------------------------------------------------------------|
+| `enabled`  | `bool`   | no            | true           | Enables using policies from Policy contract to check permissions. |
+| `contract` | `string` | no            | policy.frostfs | Policy contract hash (LE) or name in NNS.                         |
+
 # `namespaces` section
 
 Namespaces configuration.

go.mod

@@ -4,7 +4,7 @@ go 1.20
 
 require (
 	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20231121085847-241a9f1ad0a4
-	git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231109143925-dd5919348da9
+	git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231129062201-a1b61d394958
 	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6
 	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20231107114540-ab75edd70939
 	git.frostfs.info/TrueCloudLab/policy-engine v0.0.0-20231205092054-2d4a9fc6dcb3

go.sum

@@ -38,8 +38,8 @@ cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3f
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20231121085847-241a9f1ad0a4 h1:wjLfZ3WCt7qNGsQv+Jl0TXnmtg0uVk/jToKPFTBc/jo=
 git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20231121085847-241a9f1ad0a4/go.mod h1:uY0AYmCznjZdghDnAk7THFIe1Vlg531IxUcus7ZfUJI=
-git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231109143925-dd5919348da9 h1:o14uxW6CLyweCdptexXn0ox0zGegdXc8lx8XauJ+b24=
+git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231129062201-a1b61d394958 h1:X9yPizADIhD3K/gdKVCthlAnf9aQ3UJJGnZgIwwixRQ=
-git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231109143925-dd5919348da9/go.mod h1:rQWdsG18NaiFvkJpMguJev913KD/yleHaniRBkUyt0o=
+git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231129062201-a1b61d394958/go.mod h1:rQWdsG18NaiFvkJpMguJev913KD/yleHaniRBkUyt0o=
 git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0 h1:FxqFDhQYYgpe41qsIHVOcdzSVCB8JNSfPG7Uk4r2oSk=
 git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0/go.mod h1:RUIKZATQLJ+TaYQa60X2fTDwfuhMfm8Ar60bQ5fr+vU=
 git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6 h1:aGQ6QaAnTerQ5Dq5b2/f9DUQtSqPkZZ/bkMx/HKuLCo=

internal/frostfs/frostfsid/frostfsid.go

@@ -8,11 +8,9 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-contract/frostfsid/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
-	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/util"
-	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/ns"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
-	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/wallet"
 )
 
@@ -39,7 +37,7 @@ var (
 
 // New creates new FrostfsID contract wrapper that implements auth.FrostFSID interface.
 func New(ctx context.Context, cfg Config) (*FrostFSID, error) {
-	contractHash, err := fetchContractHash(cfg)
+	contractHash, err := util.ResolveContractHash(cfg.Contract, cfg.RPCAddress)
 	if err != nil {
 		return nil, fmt.Errorf("resolve frostfs contract hash: %w", err)
 	}
@@ -79,25 +77,3 @@ func (f *FrostFSID) RegisterPublicKey(key *keys.PublicKey) error {
 
 	return nil
 }
-
-func fetchContractHash(cfg Config) (util.Uint160, error) {
-	if hash, err := util.Uint160DecodeStringLE(cfg.Contract); err == nil {
-		return hash, nil
-	}
-
-	splitName := strings.Split(cfg.Contract, ".")
-	if len(splitName) != 2 {
-		return util.Uint160{}, fmt.Errorf("invalid contract name: '%s'", cfg.Contract)
-	}
-
-	var domain container.Domain
-	domain.SetName(splitName[0])
-	domain.SetZone(splitName[1])
-
-	var nns ns.NNS
-	if err := nns.Dial(cfg.RPCAddress); err != nil {
-		return util.Uint160{}, fmt.Errorf("dial nns %s: %w", cfg.RPCAddress, err)
-	}
-
-	return nns.ResolveContractHash(domain)
-}

internal/frostfs/policy/cached_morph.go

@@ -0,0 +1,60 @@
+package policy
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
+	"go.uber.org/zap"
+)
+
+type CachedMorph struct {
+	morph engine.MorphRuleChainStorage
+	cache *cache.MorphPolicyCache
+	log   *zap.Logger
+}
+
+type CachedMorphConfig struct {
+	Morph engine.MorphRuleChainStorage
+	Cache *cache.MorphPolicyCache
+	Log   *zap.Logger
+}
+
+var _ engine.MorphRuleChainStorage = (*CachedMorph)(nil)
+
+func NewCachedMorph(config CachedMorphConfig) *CachedMorph {
+	return &CachedMorph{
+		morph: config.Morph,
+		cache: config.Cache,
+		log:   config.Log,
+	}
+}
+
+func (c *CachedMorph) AddMorphRuleChain(name chain.Name, target engine.Target, policyChain *chain.Chain) error {
+	c.cache.Delete(cache.MorphPolicyCacheKey{Target: target, Name: name})
+	return c.morph.AddMorphRuleChain(name, target, policyChain)
+}
+
+func (c *CachedMorph) RemoveMorphRuleChain(name chain.Name, target engine.Target, chainID chain.ID) error {
+	c.cache.Delete(cache.MorphPolicyCacheKey{Target: target, Name: name})
+	return c.morph.RemoveMorphRuleChain(name, target, chainID)
+}
+
+func (c *CachedMorph) ListMorphRuleChains(name chain.Name, target engine.Target) ([]*chain.Chain, error) {
+	key := cache.MorphPolicyCacheKey{Target: target, Name: name}
+	list := c.cache.Get(key)
+	if list != nil {
+		return list, nil
+	}
+
+	list, err := c.morph.ListMorphRuleChains(name, target)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = c.cache.Put(key, list); err != nil {
+		c.log.Warn(logs.CouldntCacheListPolicyChains)
+	}
+
+	return list, nil
+}

internal/frostfs/policy/contract/contract.go

@@ -0,0 +1,112 @@
+package contract
+
+import (
+	"context"
+	"fmt"
+	"math/big"
+
+	policycontract "git.frostfs.info/TrueCloudLab/frostfs-contract/policy"
+	policyclient "git.frostfs.info/TrueCloudLab/frostfs-contract/rpcclient/policy"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/util"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
+	"github.com/nspcc-dev/neo-go/pkg/wallet"
+)
+
+type Client struct {
+	actor          *actor.Actor
+	policyContract *policyclient.Contract
+}
+
+type Config struct {
+	// RPCAddress is an endpoint to connect to neo rpc.
+	RPCAddress string
+
+	// Contract is hash of contract or its name in NNS.
+	Contract string
+
+	// Key is used to interact with policy contract.
+	// If this is nil than random key will be generated.
+	Key *keys.PrivateKey
+}
+
+var _ engine.MorphRuleChainStorage = (*Client)(nil)
+
+// New creates new Policy contract wrapper.
+func New(ctx context.Context, cfg Config) (*Client, error) {
+	contractHash, err := util.ResolveContractHash(cfg.Contract, cfg.RPCAddress)
+	if err != nil {
+		return nil, fmt.Errorf("resolve frostfs contract hash: %w", err)
+	}
+
+	key := cfg.Key
+	if key == nil {
+		if key, err = keys.NewPrivateKey(); err != nil {
+			return nil, fmt.Errorf("generate anon private key for policy: %w", err)
+		}
+	}
+
+	rpcCli, err := rpcclient.New(ctx, cfg.RPCAddress, rpcclient.Options{})
+	if err != nil {
+		return nil, fmt.Errorf("create policy rpc client: %w", err)
+	}
+
+	acc := wallet.NewAccountFromPrivateKey(key)
+	act, err := actor.NewSimple(rpcCli, acc)
+	if err != nil {
+		return nil, fmt.Errorf("create new actor: %w", err)
+	}
+
+	return &Client{
+		actor:          act,
+		policyContract: policyclient.New(act, contractHash),
+	}, nil
+}
+
+func (c *Client) AddMorphRuleChain(name chain.Name, target engine.Target, policyChain *chain.Chain) error {
+	chainName := append([]byte(name), []byte(policyChain.ID)...)
+	_, err := c.actor.Wait(c.policyContract.AddChain(getKind(target), target.Name, chainName, policyChain.Bytes()))
+	return err
+}
+
+func (c *Client) RemoveMorphRuleChain(name chain.Name, target engine.Target, chainID chain.ID) error {
+	chainName := append([]byte(name), []byte(chainID)...)
+	_, err := c.actor.Wait(c.policyContract.RemoveChain(getKind(target), target.Name, chainName))
+	return err
+}
+
+func (c *Client) ListMorphRuleChains(name chain.Name, target engine.Target) ([]*chain.Chain, error) {
+	items, err := c.policyContract.ListChainsByPrefix(getKind(target), target.Name, []byte(name))
+	if err != nil {
+		return nil, err
+	}
+
+	res := make([]*chain.Chain, len(items))
+	for i, item := range items {
+		data, err := item.TryBytes()
+		if err != nil {
+			return nil, err
+		}
+
+		var policyChain chain.Chain
+		if err = policyChain.DecodeBytes(data); err != nil {
+			return nil, err
+		}
+
+		res[i] = &policyChain
+	}
+
+	return res, nil
+}
+
+func getKind(target engine.Target) *big.Int {
+	var kind int64 = policycontract.Container
+	if target.Type != engine.Container {
+		kind = policycontract.Namespace
+	}
+
+	return big.NewInt(kind)
+}

internal/frostfs/policy/storage.go

@@ -0,0 +1,42 @@
+package policy
+
+import (
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine/inmemory"
+	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/resource"
+)
+
+const S3ChainName chain.Name = "s3"
+
+type Storage struct {
+	router engine.ChainRouter
+
+	morph engine.MorphRuleChainStorage
+
+	local engine.LocalOverrideStorage
+}
+
+var _ engine.LocalOverrideEngine = (*Storage)(nil)
+
+func NewStorage(morph engine.MorphRuleChainStorage) *Storage {
+	local := inmemory.NewInmemoryLocalStorage()
+
+	return &Storage{
+		router: engine.NewDefaultChainRouterWithLocalOverrides(morph, local),
+		morph:  morph,
+		local:  local,
+	}
+}
+
+func (s Storage) IsAllowed(name chain.Name, target engine.RequestTarget, r resource.Request) (status chain.Status, found bool, err error) {
+	return s.router.IsAllowed(name, target, r)
+}
+
+func (s Storage) MorphRuleChainStorage() engine.MorphRuleChainStorage {
+	return s.morph
+}
+
+func (s Storage) LocalStorage() engine.LocalOverrideStorage {
+	return s.local
+}

internal/frostfs/util/util.go

@@ -0,0 +1,33 @@
+package util
+
+import (
+	"fmt"
+	"strings"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/ns"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+)
+
+// ResolveContractHash determine contract hash by resolving NNS name.
+func ResolveContractHash(contractHash, rpcAddress string) (util.Uint160, error) {
+	if hash, err := util.Uint160DecodeStringLE(contractHash); err == nil {
+		return hash, nil
+	}
+
+	splitName := strings.Split(contractHash, ".")
+	if len(splitName) != 2 {
+		return util.Uint160{}, fmt.Errorf("invalid contract name: '%s'", contractHash)
+	}
+
+	var domain container.Domain
+	domain.SetName(splitName[0])
+	domain.SetZone(splitName[1])
+
+	var nns ns.NNS
+	if err := nns.Dial(rpcAddress); err != nil {
+		return util.Uint160{}, fmt.Errorf("dial nns %s: %w", rpcAddress, err)
+	}
+
+	return nns.ResolveContractHash(domain)
+}

internal/logs/logs.go

@@ -99,6 +99,7 @@ const (
 	CouldntCacheBucketSettings                           = "couldn't cache bucket settings"                                                                    // Warn in ../../api/layer/cache.go
 	CouldntCacheCors                                     = "couldn't cache cors"                                                                               // Warn in ../../api/layer/cache.go
 	CouldntCacheNotificationConfiguration                = "couldn't cache notification configuration"                                                         // Warn in ../../api/layer/cache.go
+	CouldntCacheListPolicyChains                         = "couldn't cache list policy chains"                                                                 // Warn in ../../api/layer/cache.go
 	RequestEnd                                           = "request end"                                                                                       // Info in ../../api/middleware/response.go
 	CouldntReceiveAccessBoxForGateKeyRandomKeyWillBeUsed = "couldn't receive access box for gate key, random key will be used"                                 // Debug in ../../api/middleware/auth.go
 	FailedToPassAuthentication                           = "failed to pass authentication"                                                                     // Error in ../../api/middleware/auth.go
@@ -128,6 +129,7 @@ const (
 	AnonRequestSkipFrostfsIDValidation                   = "anon request, skip FrostfsID validation"                                                           // Debug in ../../api/middleware/auth.go
 	FrostfsIDValidationFailed                            = "FrostfsID validation failed"                                                                       // Error in ../../api/middleware/auth.go
 	InitFrostfsIDContractFailed                          = "init frostfsid contract failed"                                                                    // Fatal in ../../cmd/s3-gw/app.go
+	InitPolicyContractFailed                             = "init policy contract failed"                                                                       // Fatal in ../../cmd/s3-gw/app.go
 	ControlAPIHealthcheck                                = "healthcheck request"
 	ControlAPIPutPolicies                                = "put policies request"
 	ControlAPIRemovePolicies                             = "remove policies request"

pkg/service/control/server/server.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/policy"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/pkg/service/control"
 	frostfscrypto "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/crypto"
@@ -43,14 +44,14 @@ type cfg struct {
 
 	settings Settings
 
-	chainStorage engine.LocalOverrideEngine
+	chainStorage engine.LocalOverrideStorage
 }
 
 func defaultCfg() *cfg {
 	return &cfg{
 		log:          zap.NewNop(),
 		settings:     defaultSettings{},
-		chainStorage: inmemory.NewInMemoryLocalOverrides(),
+		chainStorage: inmemory.NewInmemoryLocalStorage(),
 	}
 }
 
@@ -84,7 +85,7 @@ func WithLogger(log *zap.Logger) Option {
 }
 
 // WithChainStorage returns option to set logger.
-func WithChainStorage(chainStorage engine.LocalOverrideEngine) Option {
+func WithChainStorage(chainStorage engine.LocalOverrideStorage) Option {
 	return func(c *cfg) {
 		c.chainStorage = chainStorage
 	}
@@ -141,7 +142,7 @@ func (s *Server) putPolicy(data *control.PutPoliciesRequest_ChainData) error {
 	}
 
 	ns := s.settings.ResolveNamespaceAlias(data.GetNamespace())
-	if _, err := s.chainStorage.LocalStorage().AddOverride(chain.Ingress, engine.NamespaceTarget(ns), &overrideChain); err != nil {
+	if _, err := s.chainStorage.AddOverride(policy.S3ChainName, engine.NamespaceTarget(ns), &overrideChain); err != nil {
 		return status.Error(codes.Internal, err.Error())
 	}
 
@@ -170,7 +171,7 @@ func (s *Server) RemovePolicies(_ context.Context, req *control.RemovePoliciesRe
 
 func (s *Server) removePolicy(info *control.RemovePoliciesRequest_ChainInfo) error {
 	ns := s.settings.ResolveNamespaceAlias(info.GetNamespace())
-	err := s.chainStorage.LocalStorage().RemoveOverride(chain.Ingress, engine.NamespaceTarget(ns), chain.ID(info.GetChainID()))
+	err := s.chainStorage.RemoveOverride(policy.S3ChainName, engine.NamespaceTarget(ns), chain.ID(info.GetChainID()))
 	if err != nil {
 		if isNotFoundError(err) {
 			return status.Error(codes.NotFound, err.Error())
@@ -193,7 +194,7 @@ func (s *Server) GetPolicy(_ context.Context, req *control.GetPolicyRequest) (*c
 	}
 
 	ns := s.settings.ResolveNamespaceAlias(req.GetBody().GetNamespace())
-	overrideChain, err := s.chainStorage.LocalStorage().GetOverride(chain.Ingress, engine.NamespaceTarget(ns), chain.ID(req.GetBody().GetChainID()))
+	overrideChain, err := s.chainStorage.GetOverride(policy.S3ChainName, engine.NamespaceTarget(ns), chain.ID(req.GetBody().GetChainID()))
 	if err != nil {
 		return nil, status.Error(codes.InvalidArgument, err.Error())
 	}
@@ -214,7 +215,7 @@ func (s *Server) ListPolicies(_ context.Context, req *control.ListPoliciesReques
 	}
 
 	ns := s.settings.ResolveNamespaceAlias(req.GetBody().GetNamespace())
-	chains, err := s.chainStorage.LocalStorage().ListOverrides(chain.Ingress, engine.NamespaceTarget(ns))
+	chains, err := s.chainStorage.ListOverrides(policy.S3ChainName, engine.NamespaceTarget(ns))
 	if err != nil {
 		return nil, status.Error(codes.InvalidArgument, err.Error())
 	}