From 04c7b97db5a7a157e9b6c771d3267bc592387da7 Mon Sep 17 00:00:00 2001 From: Anurag Rajawat Date: Tue, 23 Jan 2024 17:18:35 +0530 Subject: [PATCH] feat: Add Network Policy adapter Signed-off-by: Anurag Rajawat --- pkg/adapter/idpool/idpool.go | 30 ++- .../nimbus-kubearmor/manager/kspmanager.go | 2 +- .../nimbus-kubearmor/processor/kspbuilder.go | 2 +- pkg/adapter/nimbus-netpol/.dockerignore | 1 + pkg/adapter/nimbus-netpol/Dockerfile | 34 +++ pkg/adapter/nimbus-netpol/Makefile | 36 +++ pkg/adapter/nimbus-netpol/go.mod | 70 ++++++ pkg/adapter/nimbus-netpol/go.sum | 216 ++++++++++++++++++ pkg/adapter/nimbus-netpol/main.go | 45 ++++ .../nimbus-netpol/manager/netpols_manager.go | 117 ++++++++++ .../nimbus-netpol/processor/netpol_builder.go | 93 ++++++++ 11 files changed, 639 insertions(+), 7 deletions(-) create mode 100644 pkg/adapter/nimbus-netpol/.dockerignore create mode 100644 pkg/adapter/nimbus-netpol/Dockerfile create mode 100644 pkg/adapter/nimbus-netpol/Makefile create mode 100644 pkg/adapter/nimbus-netpol/go.mod create mode 100644 pkg/adapter/nimbus-netpol/go.sum create mode 100644 pkg/adapter/nimbus-netpol/main.go create mode 100644 pkg/adapter/nimbus-netpol/manager/netpols_manager.go create mode 100644 pkg/adapter/nimbus-netpol/processor/netpol_builder.go diff --git a/pkg/adapter/idpool/idpool.go b/pkg/adapter/idpool/idpool.go index eacfe0ca..355ef92e 100644 --- a/pkg/adapter/idpool/idpool.go +++ b/pkg/adapter/idpool/idpool.go @@ -1,9 +1,13 @@ // SPDX-License-Identifier: Apache-2.0 // Copyright 2023 Authors of Nimbus -// Package idpool manages a pool of IDs for use by KubeArmor. +// Package idpool manages a pool of IDs for use by adapters. package idpool +import ( + "strings" +) + const ( SwDeploymentTools = "swDeploymentTools" UnAuthorizedSaTokenAccess = "unAuthorizedSaTokenAccess" @@ -16,12 +20,28 @@ const ( // KaIds are IDs supported by KubeArmor. var KaIds = []string{ - SwDeploymentTools, UnAuthorizedSaTokenAccess, + SwDeploymentTools, UnAuthorizedSaTokenAccess, DNSManipulation, +} + +// NetPolIDs are IDs supported by Network Policy adapter. +var NetPolIDs = []string{ + DNSManipulation, +} + +// IsIdSupportedBy determines whether a given ID is supported by a security engine. +func IsIdSupportedBy(id, securityEngine string) bool { + switch strings.ToLower(securityEngine) { + case "kubearmor": + return in(id, KaIds) + case "netpol": + return in(id, NetPolIDs) + default: + return false + } } -// IsIdSupported determines whether a given ID is supported by KubeArmor. -func IsIdSupported(id string) bool { - for _, currId := range KaIds { +func in(id string, securityEngineIds []string) bool { + for _, currId := range securityEngineIds { if currId == id { return true } diff --git a/pkg/adapter/nimbus-kubearmor/manager/kspmanager.go b/pkg/adapter/nimbus-kubearmor/manager/kspmanager.go index cd4d38db..cda9c017 100644 --- a/pkg/adapter/nimbus-kubearmor/manager/kspmanager.go +++ b/pkg/adapter/nimbus-kubearmor/manager/kspmanager.go @@ -99,7 +99,7 @@ func createKsp(ctx context.Context, npName, npNamespace string) { // Check if all strict mode intents are implemented by the adapter. allStrictIntentsImplemented := true for _, rule := range np.Spec.NimbusRules { - if rule.Rule.Mode == "strict" && !idpool.IsIdSupported(rule.ID) { + if rule.Rule.Mode == "strict" && !idpool.IsIdSupportedBy(rule.ID, "kubearmor") { allStrictIntentsImplemented = false logger.Info("The adapter does not support the strict mode intent", "ID", rule.ID) break diff --git a/pkg/adapter/nimbus-kubearmor/processor/kspbuilder.go b/pkg/adapter/nimbus-kubearmor/processor/kspbuilder.go index bcf53cc7..6a905c2a 100644 --- a/pkg/adapter/nimbus-kubearmor/processor/kspbuilder.go +++ b/pkg/adapter/nimbus-kubearmor/processor/kspbuilder.go @@ -21,7 +21,7 @@ func BuildKspsFrom(logger logr.Logger, np *v1.NimbusPolicy) []kubearmorv1.KubeAr var ksps []kubearmorv1.KubeArmorPolicy for _, nimbusRule := range np.Spec.NimbusRules { id := nimbusRule.ID - if idpool.IsIdSupported(id) { + if idpool.IsIdSupportedBy(id, "kubearmor") { ksp := buildKspFor(id) ksp.Name = np.Name + "-" + strings.ToLower(id) ksp.Namespace = np.Namespace diff --git a/pkg/adapter/nimbus-netpol/.dockerignore b/pkg/adapter/nimbus-netpol/.dockerignore new file mode 100644 index 00000000..e660fd93 --- /dev/null +++ b/pkg/adapter/nimbus-netpol/.dockerignore @@ -0,0 +1 @@ +bin/ diff --git a/pkg/adapter/nimbus-netpol/Dockerfile b/pkg/adapter/nimbus-netpol/Dockerfile new file mode 100644 index 00000000..8aefda73 --- /dev/null +++ b/pkg/adapter/nimbus-netpol/Dockerfile @@ -0,0 +1,34 @@ +# SPDX-License-Identifier: Apache-2.0 +# Copyright 2023 Authors of Nimbus + +# Build the nimbus-netpol binary +FROM golang:1.21 as builder +ARG TARGETOS +ARG TARGETARCH + +WORKDIR /workspace +# Copy the Go Modules manifests +COPY go.mod go.mod +COPY go.sum go.sum +# cache deps before building and copying source so that we don't need to re-download as much +# and so that source changes don't invalidate our downloaded layer +RUN go mod download + +# Copy the go source +COPY main.go main.go +COPY manager/ manager/ +COPY processor/ processor/ + +# Build +# the GOARCH has not a default value to allow the binary be built according to the host where the command +# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO +# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore, +# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform. +RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -ldflags="-w" -a -o nimbus-netpol main.go + +FROM gcr.io/distroless/static:nonroot +WORKDIR / +COPY --from=builder /workspace/nimbus-netpol . +USER 65532:65532 + +ENTRYPOINT ["/nimbus-netpol"] diff --git a/pkg/adapter/nimbus-netpol/Makefile b/pkg/adapter/nimbus-netpol/Makefile new file mode 100644 index 00000000..ce45b051 --- /dev/null +++ b/pkg/adapter/nimbus-netpol/Makefile @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: Apache-2.0 +# Copyright 2023 Authors of Nimbus + +# Image URL to use all building/pushing image targets +IMG ?= 5gsec/nimbus-cni +# Image Tag to use all building/pushing image targets +TAG ?= v0.1 + +CONTAINER_TOOL ?= docker +BINARY ?= bin/nimbus-netpol + +build: + @go build -ldflags="-w" -o ${BINARY} main.go + +run: build + @./${BINARY} + +.PHONY: docker-build +docker-build: + $(CONTAINER_TOOL) build -t ${IMG}:${TAG} -t ${IMG}:latest --build-arg VERSION=${TAG} . + +.PHONY: docker-push +docker-push: + $(CONTAINER_TOOL) push ${IMG}:${TAG} + $(CONTAINER_TOOL) push ${IMG}:latest + +PLATFORMS ?= linux/arm64,linux/amd64,linux/s390x,linux/ppc64le +.PHONY: docker-buildx +docker-buildx: + # copy existing Dockerfile and insert --platform=${BUILDPLATFORM} into Dockerfile.cross, and preserve the original Dockerfile + sed -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross + - $(CONTAINER_TOOL) buildx create --name project-v3-builder + $(CONTAINER_TOOL) buildx use project-v3-builder + - $(CONTAINER_TOOL) buildx build --push --platform=$(PLATFORMS) --build-arg VERSION=${TAG} --tag ${IMG}:${TAG} -f Dockerfile.cross . || { $(CONTAINER_TOOL) buildx rm project-v3-builder; rm Dockerfile.cross; exit 1; } + - $(CONTAINER_TOOL) buildx rm project-v3-builder + rm Dockerfile.cross diff --git a/pkg/adapter/nimbus-netpol/go.mod b/pkg/adapter/nimbus-netpol/go.mod new file mode 100644 index 00000000..6b20e3ef --- /dev/null +++ b/pkg/adapter/nimbus-netpol/go.mod @@ -0,0 +1,70 @@ +module github.com/5GSEC/nimbus/pkg/adapter/nimbus-netpol + +go 1.21 + +require ( + github.com/5GSEC/nimbus v0.0.0-20240123095101-3e46af24d848 + github.com/go-logr/logr v1.4.1 + k8s.io/api v0.29.0 + k8s.io/apimachinery v0.29.0 + sigs.k8s.io/controller-runtime v0.17.0 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/evanphx/json-patch v5.6.0+incompatible // indirect + github.com/evanphx/json-patch/v5 v5.8.0 // indirect + github.com/fsnotify/fsnotify v1.7.0 // indirect + github.com/go-logr/zapr v1.3.0 // indirect + github.com/go-openapi/jsonpointer v0.20.0 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.4 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.6.0 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.5.0 // indirect + github.com/imdario/mergo v0.3.16 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.18.0 // indirect + github.com/prometheus/client_model v0.5.0 // indirect + github.com/prometheus/common v0.45.0 // indirect + github.com/prometheus/procfs v0.12.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + go.uber.org/multierr v1.11.0 // indirect + go.uber.org/zap v1.26.0 // indirect + golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1 // indirect + golang.org/x/net v0.19.0 // indirect + golang.org/x/oauth2 v0.12.0 // indirect + golang.org/x/sys v0.16.0 // indirect + golang.org/x/term v0.15.0 // indirect + golang.org/x/text v0.14.0 // indirect + golang.org/x/time v0.3.0 // indirect + gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect + google.golang.org/appengine v1.6.8 // indirect + google.golang.org/protobuf v1.31.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/apiextensions-apiserver v0.29.0 // indirect + k8s.io/client-go v0.29.0 // indirect + k8s.io/component-base v0.29.0 // indirect + k8s.io/klog/v2 v2.110.1 // indirect + k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00 // indirect + k8s.io/utils v0.0.0-20230726121419-3b25d923346b // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect +) diff --git a/pkg/adapter/nimbus-netpol/go.sum b/pkg/adapter/nimbus-netpol/go.sum new file mode 100644 index 00000000..1b68656a --- /dev/null +++ b/pkg/adapter/nimbus-netpol/go.sum @@ -0,0 +1,216 @@ +github.com/5GSEC/nimbus v0.0.0-20240123095101-3e46af24d848 h1:f1WIOKlRxjcBXQBPohwASiZ4uLWqkzwJCu7mHlro/Eo= +github.com/5GSEC/nimbus v0.0.0-20240123095101-3e46af24d848/go.mod h1:e7IDCzHjsO5/Q+eNSNP7vR8wLPORVo4Ded2xjr2k4pk= +github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= +github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44= 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h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0= +sigs.k8s.io/controller-runtime v0.17.0 h1:fjJQf8Ukya+VjogLO6/bNX9HE6Y2xpsO5+fyS26ur/s= +sigs.k8s.io/controller-runtime v0.17.0/go.mod h1:+MngTvIQQQhfXtwfdGw/UOQ/aIaqsYywfCINOtwMO/s= +sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo= +sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0= +sigs.k8s.io/structured-merge-diff/v4 v4.4.1 h1:150L+0vs/8DA78h1u02ooW1/fFq/Lwr+sGiqlzvrtq4= +sigs.k8s.io/structured-merge-diff/v4 v4.4.1/go.mod h1:N8hJocpFajUSSeSJ9bOZ77VzejKZaXsTtZo4/u7Io08= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/pkg/adapter/nimbus-netpol/main.go b/pkg/adapter/nimbus-netpol/main.go new file mode 100644 index 00000000..2d860e2d --- /dev/null +++ b/pkg/adapter/nimbus-netpol/main.go @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: Apache-2.0 +// Copyright 2023 Authors of Nimbus + +package main + +import ( + "context" + "os" + "os/signal" + "syscall" + + ctrl "sigs.k8s.io/controller-runtime" + "sigs.k8s.io/controller-runtime/pkg/log/zap" + + "github.com/5GSEC/nimbus/pkg/adapter/nimbus-netpol/manager" + "github.com/5GSEC/nimbus/pkg/adapter/watcher" +) + +func main() { + ctrl.SetLogger(zap.New()) + logger := ctrl.Log + + ctx, cancelFunc := context.WithCancel(context.Background()) + ctrl.LoggerInto(ctx, logger) + + nimbusPolicyCh := make(chan [2]string) + nimbusPolicyToDeleteCh := make(chan [2]string) + go watcher.WatchNimbusPolicies(ctx, nimbusPolicyCh, nimbusPolicyToDeleteCh) + + clusterNpChan := make(chan string) + clusterNpToDeleteChan := make(chan string) + go watcher.WatchClusterNimbusPolicies(ctx, clusterNpChan, clusterNpToDeleteChan) + + go func() { + termChan := make(chan os.Signal) + signal.Notify(termChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT) + <-termChan + logger.Info("Shutdown signal received, waiting for all workers to finish") + cancelFunc() + logger.Info("All workers finished, shutting down") + }() + + logger.Info("Network Policy adapter started") + manager.ManageNetPols(ctx, nimbusPolicyCh, nimbusPolicyToDeleteCh, clusterNpChan, clusterNpToDeleteChan) +} diff --git a/pkg/adapter/nimbus-netpol/manager/netpols_manager.go b/pkg/adapter/nimbus-netpol/manager/netpols_manager.go new file mode 100644 index 00000000..07630206 --- /dev/null +++ b/pkg/adapter/nimbus-netpol/manager/netpols_manager.go @@ -0,0 +1,117 @@ +package manager + +import ( + "context" + "fmt" + + netv1 "k8s.io/api/networking/v1" + "k8s.io/apimachinery/pkg/api/errors" + "k8s.io/apimachinery/pkg/runtime" + "k8s.io/apimachinery/pkg/types" + utilruntime "k8s.io/apimachinery/pkg/util/runtime" + ctrl "sigs.k8s.io/controller-runtime" + "sigs.k8s.io/controller-runtime/pkg/client" + "sigs.k8s.io/controller-runtime/pkg/log" + + v1 "github.com/5GSEC/nimbus/api/v1" + "github.com/5GSEC/nimbus/pkg/adapter/k8s" + "github.com/5GSEC/nimbus/pkg/adapter/nimbus-netpol/processor" +) + +var ( + scheme = runtime.NewScheme() + np v1.NimbusPolicy + k8sClient client.Client + err error +) + +func init() { + utilruntime.Must(v1.AddToScheme(scheme)) + utilruntime.Must(netv1.AddToScheme(scheme)) + + k8sClient, err = k8s.New(scheme) + if err != nil { + fmt.Println(err) + return + } +} + +func ManageNetPols(ctx context.Context, nimbusPolicyCh chan [2]string, nimbusPolicyToDeleteCh chan [2]string, clusterNpChan chan string, clusterNpToDeleteChan chan string) { + for { + select { + case _ = <-ctx.Done(): + close(nimbusPolicyCh) + close(nimbusPolicyToDeleteCh) + close(clusterNpChan) + close(clusterNpToDeleteChan) + return + case createdNp := <-nimbusPolicyCh: + createNetworkPolicy(ctx, createdNp[0], createdNp[1]) + case deletedNp := <-nimbusPolicyToDeleteCh: + deleteNetworkPolicy(ctx, deletedNp[0], deletedNp[1]) + case _ = <-clusterNpChan: // Fixme: Create netpol based on ClusterNP + fmt.Println("No-op for ClusterNimbusPolicy") + case _ = <-clusterNpToDeleteChan: // Fixme: Delete netpol based on ClusterNP + fmt.Println("No-op for ClusterNimbusPolicy") + } + } +} + +func createNetworkPolicy(ctx context.Context, npName, npNamespace string) { + logger := log.FromContext(ctx) + if err := k8sClient.Get(ctx, types.NamespacedName{Name: npName, Namespace: npNamespace}, &np); err != nil { + logger.Error(err, "failed to get NimbusPolicy", "NimbusPolicy.Name", npName[0], "NimbusPolicy.Namespace", npName[1]) + return + } + + netPols := processor.BuildNetPolsFrom(logger, np) + // Iterate using a separate index variable to avoid aliasing + for idx := range netPols { + netpol := netPols[idx] + + // Set NimbusPolicy as the owner of the network policy + if err := ctrl.SetControllerReference(&np, &netpol, scheme); err != nil { + logger.Error(err, "failed to set OwnerReference on NetworkPolicy", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + return + } + + var existingNetpol netv1.NetworkPolicy + err := k8sClient.Get(ctx, types.NamespacedName{Name: netpol.Name, Namespace: netpol.Namespace}, &existingNetpol) + if err != nil && !errors.IsNotFound(err) { + logger.Error(err, "failed to get existing NetworkPolicy", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + return + } + if errors.IsNotFound(err) { + if err = k8sClient.Create(ctx, &netpol); err != nil { + logger.Error(err, "failed to create NetworkPolicy", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + return + } + logger.Info("NetworkPolicy created", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + } else { + netpol.ObjectMeta.ResourceVersion = existingNetpol.ObjectMeta.ResourceVersion + if err = k8sClient.Update(ctx, &netpol); err != nil { + logger.Error(err, "failed to configure existing NetworkPolicy", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + return + } + logger.Info("NetworkPolicy configured", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + } + } +} + +func deleteNetworkPolicy(ctx context.Context, npName, npNamespace string) { + logger := log.FromContext(ctx) + netPols := processor.BuildNetPolsFrom(logger, np) + for idx := range netPols { + netpol := netPols[idx] + var existingNetpol netv1.NetworkPolicy + err := k8sClient.Get(ctx, types.NamespacedName{Name: npName, Namespace: npNamespace}, &existingNetpol) + if err != nil { + if errors.IsNotFound(err) { + logger.Info("NetworkPolicy already deleted, no action needed", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + } else { + logger.Error(err, "failed to get existing NetworkPolicy", "NetworkPolicy.Name", netpol.Name, "NetworkPolicy.Namespace", netpol.Namespace) + continue + } + } + } +} diff --git a/pkg/adapter/nimbus-netpol/processor/netpol_builder.go b/pkg/adapter/nimbus-netpol/processor/netpol_builder.go new file mode 100644 index 00000000..66142663 --- /dev/null +++ b/pkg/adapter/nimbus-netpol/processor/netpol_builder.go @@ -0,0 +1,93 @@ +package processor + +import ( + "strings" + + "github.com/go-logr/logr" + corev1 "k8s.io/api/core/v1" + netv1 "k8s.io/api/networking/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/util/intstr" + + v1 "github.com/5GSEC/nimbus/api/v1" + "github.com/5GSEC/nimbus/pkg/adapter/idpool" +) + +func BuildNetPolsFrom(logger logr.Logger, np v1.NimbusPolicy) []netv1.NetworkPolicy { + // Build netpols based on given IDs + var netpols []netv1.NetworkPolicy + for _, nimbusRule := range np.Spec.NimbusRules { + id := nimbusRule.ID + if idpool.IsIdSupportedBy(id, "netpol") { + netpol := buildNetPolFor(id) + netpol.Name = np.Name + "-" + strings.ToLower(id) + netpol.Namespace = np.Namespace + netpol.Spec.PodSelector.MatchLabels = np.Spec.Selector.MatchLabels + addManagedByAnnotation(&netpol) + netpols = append(netpols, netpol) + } else { + logger.Info("Network Policy adapter does not support this ID", "ID", id, + "NimbusPolicy.Name", np.Name, "NimbusPolicy.Namespace", np.Namespace) + } + } + return netpols +} + +func buildNetPolFor(id string) netv1.NetworkPolicy { + switch id { + case idpool.DNSManipulation: + return dnsManipulationNetpol() + default: + return netv1.NetworkPolicy{} + } +} + +func dnsManipulationNetpol() netv1.NetworkPolicy { + udpProtocol := corev1.ProtocolUDP + tcpProtocol := corev1.ProtocolTCP + dnsPort := &intstr.IntOrString{ + Type: 0, + IntVal: 53, + } + + return netv1.NetworkPolicy{ + Spec: netv1.NetworkPolicySpec{ + Egress: []netv1.NetworkPolicyEgressRule{ + { + To: []netv1.NetworkPolicyPeer{ + { + PodSelector: &metav1.LabelSelector{ + MatchLabels: map[string]string{ + "k8s-app": "kube-dns", + }, + }, + NamespaceSelector: &metav1.LabelSelector{ + MatchLabels: map[string]string{ + "kubernetes.io/metadata.name": "kube-system", + }, + }, + }, + }, + Ports: []netv1.NetworkPolicyPort{ + { + Protocol: &udpProtocol, + Port: dnsPort, + }, + { + Protocol: &tcpProtocol, + Port: dnsPort, + }, + }, + }, + }, + PolicyTypes: []netv1.PolicyType{ + netv1.PolicyTypeEgress, + }, + }, + } +} + +func addManagedByAnnotation(netpol *netv1.NetworkPolicy) { + netpol.Annotations = make(map[string]string) + netpol.Annotations["app.kubernetes.io/managed-by"] = "nimbus-netpol" +}