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Allow ContainerProfiles to allowlist cluster-infrastructure egress and ingress by Service name (serviceRef), Service label selector (serviceSelector), or host entity (entity: "host"), instead of broad ipAddresses service CIDRs that blind R0011/R0012 to lateral movement.
Key Changes
Dependency Bump:
Bump github.com/kubescape/storage to v0.0.306 (which includes ServiceRefNamespace, ServiceRefName, ServiceSelector, and Entity on v1beta1.NetworkNeighbor).
New Package pkg/networkpeer:
resolve.go: Resolves peer specifications into concrete IP addresses, port/protocol allow tuples, and cluster FQDN DNS names (<name>.<namespace>.svc.cluster.local). Fails closed on unsupported expressions or empty selectors.
expand.go: Synthesizes resolved NetworkNeighbor entries from service/entity neighbors at projection time without mutating original profile definitions.
lister.go: Production InformerLister backed by Service, EndpointSlice, and Node informer listers. Includes TrimService and TrimEndpointSlice transformer functions to strip managed fields and annotations to minimize memory footprint.
Comprehensive test suite covering resolve truth tables, selector scoping, host gateway calculation, and informer caching performance benchmarks.
ContainerProfile Cache Integration:
UsesServiceResolution and ListerGen fields on CachedContainerProfile track whether a profile depends on the cluster view and which lister generation it was resolved against.
reconciler.go fast-skip checks ListerGen == c.listerGen() for service-resolving profiles, re-projecting when endpoints churn or informers fill asynchronously.
ProjectedContainerProfile.ResolvedGen participates in CEL function cache hashing in pkg/rulemanager/cel/libraries/cache/function_cache.go to invalidate memoized CEL results when cluster endpoints move.
Configuration & Informer Lifecycle:
Added EnableNetworkServiceResolution (networkServiceResolutionEnabled) to Config.
Informers in cmd/main.go are gated behind this flag and started in the background without blocking node-agent startup.
Testing
Unit tests: go test -v ./pkg/networkpeer/... ./pkg/objectcache/containerprofilecache/... ./pkg/rulemanager/cel/...
Full package test pass across the repository.
Summary by CodeRabbit
New Features
ContainerProfile network rules can now resolve Kubernetes Service references, Service and namespace selectors, and host entities into current IP addresses and DNS names.
Resolved network rules update as relevant cluster resources change. The feature is opt-in and disabled by default.
Documentation
Added configuration guidance, including the Kubernetes read permissions required to enable network service resolution.
…or ContainerProfile network rules
Enable ContainerProfiles to allowlist cluster-infrastructure egress/ingress
by Service name (serviceRef), Service label selector (serviceSelector), or host
entity instead of broad ipAddresses CIDRs.
- Bump github.com/kubescape/storage to v0.0.306
- Add pkg/networkpeer with Lister, Resolve, Expand, and InformerLister
- Gated behind EnableNetworkServiceResolution (default false) with SetTransform
memory optimizations stripping managedFields and annotations
- Expand serviceRef/serviceSelector/entity into concrete ClusterIP, EndpointSlice,
and cluster FQDN DNS names at ContainerProfile projection time
- Track lister generation on ContainerProfileCache and ProjectedContainerProfile
to re-project and invalidate CEL result caches when cluster endpoints churn
- Add comprehensive resolve, expand, lister, and benchmark unit test suites
The change adds optional Kubernetes-backed resolution for ContainerProfile network peers. It resolves Service references, Service selectors, and the host entity, then tracks cluster-view changes through profile reconciliation and CEL cache keys.
Changes
Network service resolution
Layer / File(s)
Summary
Peer resolution and informer lister pkg/networkpeer/*
Adds Service, EndpointSlice, and Node-backed peer resolution, neighbor expansion, validation, and generation tracking. Tests and benchmarks cover these paths and informer cache memory estimates.
Profile projection and cache freshness pkg/objectcache/containerprofilecache/*, pkg/objectcache/projection_types.go, pkg/rulemanager/cel/libraries/cache/*
Resolves service neighbors during projection. Records the source resource version and lister generation, uses generation changes during reconciliation, and includes both values in CEL cache keys.
Configuration and informer wiring pkg/config/config.go, cmd/main.go, docs/CONFIGURATION.md, go.mod
Adds the configuration option and conditionally starts Kubernetes informers and installs the lister. Documents the option and required permissions. Updates the storage dependency version.
Docstring coverage is 54.17% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 17 files. (2 skipped:…
Write docstrings for the functions missing them to satisfy the coverage threshold.
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The title clearly summarizes the main change: ServiceRef and EndpointSlice peer resolution for ContainerProfile network rules.
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Docstring coverage is 54.17% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 17 files. (2 skipped: 2 unsupported.)
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- Capture informer lister generation once prior to service neighbor resolution in reconciler to avoid races and inconsistencies
- Document networkServiceResolutionEnabled in docs/CONFIGURATION.md
- Test cache key generation using the production cache.HashForContainerProfile hasher
- Clarify ExpandServiceNeighbors doc comment regarding port preservation and address matching
Reject /31 and /32 IPv4 prefixes before containment checks
pkg/networkpeer/lister.go:190
The stated /31 fail-closed behavior is not implemented: for 10.0.0.0/31, 10.0.0.1 is still inside the CIDR, so this function returns it. Reject IPv4 prefix lengths of 31 or 32 explicitly before the containment check, matching this safety contract.
Generation changes bypass validator eligibility after unchanged responses
This generation check is bypassed when the conditional profile backend returns ErrProfileUnchanged: the branch at lines 453–466 returns before reaching this predicate. For a completed learned profile with a checksum, EndpointSlice/Service churn therefore keeps the old resolved addresses until the forced full-body fetch after 10 unchanged responses (about 10 minutes at the documented default refresh rate). Include the lister-generation condition in validatorEligible so a changed cluster view forces a body/rebuild, and cover that interaction with the conditional checksum client.
- Exclude explicitly unready EndpointSlice addresses and preserve Conditions.Ready in TrimEndpointSlice
- Reject /31 and /32 IPv4 prefix lengths in gatewayIP
- Include lister generation check in reconciler validatorEligible so cluster changes force full-body fetch and rebuild
- Add comprehensive tests for endpoint readiness, /31 gateway rejection, and conditional fetch invalidation
Reject ambiguous profiles with multiple target kinds
pkg/networkpeer/expand.go:109
This switch does not enforce the documented one-of contract: the storage fields can coexist, so an entry containing entity plus a service reference/selector silently resolves only the entity. In the host case that can suppress host traffic even though the profile is ambiguous, rather than failing closed. Count the three target kinds first and reject unless exactly one is present (and require both service-reference fields).
- Retain rawProfile on service-resolving cached entries to enable local in-memory reprojection on cluster churn without storage download amplification
- Enforce one-of target kind contract and complete ServiceRef validation in specFromNeighbor, failing closed on ambiguous or incomplete specs
- Add test coverage for local reprojection on ErrProfileUnchanged and multi-target peer rejection
The permission requirements omit the Node informer started by this feature. Kubernetes informers require list/watch, so granting only the documented Service and EndpointSlice permissions leaves entity: "host" unresolved. Document the Node requirement as well.
ResolvedGen only changes with informer events, so it does not invalidate cached CEL results when a user-authored profile changes its serviceRef/selector while the cluster view stays unchanged. As resolvedgen_test.go:43-45 notes, authored profiles carry no SyncChecksum; the rebuilt projection therefore keeps the same key and an old allow/deny result can survive for the configured cache TTL. Include a source/projected-content generation (for example the authored resource version or a projected-content hash) in this key as well.
Make informer allocation test opt-in or a benchmark
pkg/networkpeer/perf_bench_test.go:232
Despite the comment saying to run this with -run, naming it Test... makes every normal package test allocate thousands of informer objects and force several global GCs, while asserting nothing. Make it a benchmark/opt-in diagnostic so routine test runs do not pay this cost.
The cache key still omits the remote profile content checksum. SyncChecksum comes from helpersv1.SyncChecksumMetadataKey, while remote bodies are versioned by storage.ContainerProfileChecksumAnnotationKey; TestChecksumChangeRebuildsDespiteMatchingResourceVersion explicitly covers content/checksum changes with an unchanged or empty resourceVersion. After such a rebuild every component here can remain unchanged, so CEL may serve the old result until the LRU entry expires. Carry the backend checksum into ProjectedContainerProfile and include it in this key.
Avoid invalidating service-profile caches for unchanged cluster data.
The handlers bump InformerLister for every watched Service, EndpointSlice, and local Node event. refreshOneEntry then rebuilds every service-dependent profile when the generation changes. Resolved profiles can be deep-copied, and ResolvedGen changes even when the resolved addresses do not. Because ResolvedGen is part of the CEL cache key, these events can cause repeated allocations and CEL cache misses.
Filter updates by resolver-relevant fields, or retain the previous projection and generation when the effective resolved neighbor set is unchanged. A ResourceVersion comparison alone only filters same-version notifications. It does not filter a Node status update that writes a new object and receives a new version.
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Review comment at @cmd/main.go around lines 366 - 408:
Update the informer event handlers that call serviceLister.Bump so they
invalidate only when resolver-relevant data changes; do not rely on
ResourceVersion alone, since meaningful no-op updates can receive a new version.
Alternatively, retain the prior resolved-neighbor projection and generation when
the effective neighbor set is unchanged, so refreshOneEntry does not alter
ResolvedGen or trigger unnecessary CEL cache misses.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Nitpick comments:
Review comments at @cmd/main.go:
- Around line 366-408: Update the informer event handlers that call
serviceLister.Bump so they invalidate only when resolver-relevant data changes;
do not rely on ResourceVersion alone, since meaningful no-op updates can receive
a new version. Alternatively, retain the prior resolved-neighbor projection and
generation when the effective neighbor set is unchanged, so refreshOneEntry does
not alter ResolvedGen or trigger unnecessary CEL cache misses.
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…063)
- Stop inferring CNI gateway from PodCIDR network+1; scope host entity strictly to node addresses (NodeInternalIP and NodeExternalIP)
- Convert InformerCacheMemoryEstimate from unit test to benchmark to avoid heavy allocations on routine test runs
- Carry backend checksum into ProjectedContainerProfile and include it in HashForContainerProfile to invalidate CEL cache when remote profile bodies change
The disabled-by-default feature still retains the full raw profile whenever service fields are present, because this flag does not check whether a lister was installed. With networkServiceResolutionEnabled=false, generation can never advance and the raw body is never used, so this defeats the cache's compact-projection memory behavior without enabling resolution. Gate UsesServiceResolution (in both construction paths) on c.serviceLister != nil before retaining rawProfile.
Rebuild projections on transient profile fetch errors
Cluster-only updates are re-projected only when storage answers ErrProfileUnchanged. If the profile GET times out or the backend is unavailable, the error branch returns immediately, so EndpointSlice/Service changes remain stale even though rawProfile is available locally; this couples live peer resolution to storage availability. On a lister-generation mismatch, rebuild from the retained source on transient fetch errors as well (preserving whether it is the learned or authored source), then retry source refresh on the next tick.
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Description
Allow ContainerProfiles to allowlist cluster-infrastructure egress and ingress by Service name (
serviceRef), Service label selector (serviceSelector), or host entity (entity: "host"), instead of broadipAddressesservice CIDRs that blind R0011/R0012 to lateral movement.Key Changes
github.com/kubescape/storagetov0.0.306(which includesServiceRefNamespace,ServiceRefName,ServiceSelector, andEntityonv1beta1.NetworkNeighbor).pkg/networkpeer:resolve.go: Resolves peer specifications into concrete IP addresses, port/protocol allow tuples, and cluster FQDN DNS names (<name>.<namespace>.svc.cluster.local). Fails closed on unsupported expressions or empty selectors.expand.go: Synthesizes resolvedNetworkNeighborentries from service/entity neighbors at projection time without mutating original profile definitions.lister.go: ProductionInformerListerbacked by Service, EndpointSlice, and Node informer listers. IncludesTrimServiceandTrimEndpointSlicetransformer functions to strip managed fields and annotations to minimize memory footprint.UsesServiceResolutionandListerGenfields onCachedContainerProfiletrack whether a profile depends on the cluster view and which lister generation it was resolved against.reconciler.gofast-skip checksListerGen == c.listerGen()for service-resolving profiles, re-projecting when endpoints churn or informers fill asynchronously.ProjectedContainerProfile.ResolvedGenparticipates in CEL function cache hashing inpkg/rulemanager/cel/libraries/cache/function_cache.goto invalidate memoized CEL results when cluster endpoints move.EnableNetworkServiceResolution(networkServiceResolutionEnabled) toConfig.cmd/main.goare gated behind this flag and started in the background without blocking node-agent startup.Testing
go test -v ./pkg/networkpeer/... ./pkg/objectcache/containerprofilecache/... ./pkg/rulemanager/cel/...Summary by CodeRabbit