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Add edge for shared process namespace attacks (#112)
Add the edge attack for the Shared PS Namespace attack path. Renamed the file to SHARE_PS_NAMESPACE to be consitent with the k8s api. The links processing between each container is O(n^2) (n = container in a pod), which is required to make the number of hop correct (we can't just do A -> B -> C, we need to do A ->B, A->C, B->C). The tests adds a new pods so we have 2 distinct pods to make sure we aren't linking them together.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package edge | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/DataDog/KubeHound/pkg/kubehound/graph/adapter" | ||
| "github.com/DataDog/KubeHound/pkg/kubehound/graph/types" | ||
| "github.com/DataDog/KubeHound/pkg/kubehound/models/converter" | ||
| "github.com/DataDog/KubeHound/pkg/kubehound/storage/cache" | ||
| "github.com/DataDog/KubeHound/pkg/kubehound/storage/storedb" | ||
| "github.com/DataDog/KubeHound/pkg/kubehound/store/collections" | ||
| "go.mongodb.org/mongo-driver/bson" | ||
| "go.mongodb.org/mongo-driver/bson/primitive" | ||
| ) | ||
|
|
||
| func init() { | ||
| Register(&SharePSNamespace{}, RegisterDefault) | ||
| } | ||
|
|
||
| type SharePSNamespace struct { | ||
| BaseEdge | ||
| } | ||
|
|
||
| type sharedPsNamespaceGroup struct { | ||
| Containers []primitive.ObjectID `bson:"container_ids" json:"container_ids"` | ||
| } | ||
| type sharedPsNamespaceGroupPair struct { | ||
| ContainerA primitive.ObjectID `bson:"container_a_id" json:"container_a"` | ||
| ContainerB primitive.ObjectID `bson:"container_b_id" json:"container_b"` | ||
| } | ||
|
|
||
| func (e *SharePSNamespace) Label() string { | ||
| return "SHARE_PS_NAMESPACE" | ||
| } | ||
|
|
||
| func (e *SharePSNamespace) Name() string { | ||
| return "SharePSNamespace" | ||
| } | ||
|
|
||
| // Processor delegates the processing tasks to to the generic containerEscapeProcessor. | ||
| func (e *SharePSNamespace) Processor(ctx context.Context, oic *converter.ObjectIDConverter, entry any) (any, error) { | ||
| typed, ok := entry.(*sharedPsNamespaceGroupPair) | ||
| if !ok { | ||
| return nil, fmt.Errorf("invalid type passed to processor: %T", entry) | ||
| } | ||
|
|
||
| return adapter.GremlinEdgeProcessor(ctx, oic, e.Label(), typed.ContainerA, typed.ContainerB) | ||
| } | ||
|
|
||
| func (e *SharePSNamespace) Stream(ctx context.Context, store storedb.Provider, _ cache.CacheReader, | ||
| callback types.ProcessEntryCallback, complete types.CompleteQueryCallback) error { | ||
|
|
||
| coll := adapter.MongoDB(store).Collection(collections.PodName) | ||
| pipeline := bson.A{ | ||
| bson.D{{"$match", bson.D{{"k8.spec.shareprocessnamespace", true}}}}, | ||
| bson.D{ | ||
| {"$lookup", | ||
| bson.D{ | ||
| {"from", "containers"}, | ||
| {"localField", "_id"}, | ||
| {"foreignField", "pod_id"}, | ||
| {"as", "containers_with_shared_ns"}, | ||
| }, | ||
| }, | ||
| }, | ||
| bson.D{ | ||
| {"$project", | ||
| bson.D{ | ||
| {"_id", 1}, | ||
| {"containers_with_shared_ns", bson.D{{"_id", 1}}}, | ||
| }, | ||
| }, | ||
| }, | ||
| bson.D{ | ||
| {"$project", | ||
| bson.D{ | ||
| {"_id", 0}, | ||
| {"container_ids", "$containers_with_shared_ns._id"}, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| cur, err := coll.Aggregate(ctx, pipeline) | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
| defer cur.Close(ctx) | ||
|
|
||
| for cur.Next(ctx) { | ||
| var entry sharedPsNamespaceGroup | ||
| err := cur.Decode(&entry) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for _, containerSrc := range entry.Containers { | ||
| for _, containerDst := range entry.Containers { | ||
| // No need to create a link with itself | ||
| if containerSrc == containerDst { | ||
| continue | ||
| } | ||
| err = callback(ctx, &sharedPsNamespaceGroupPair{ | ||
| ContainerA: containerSrc, | ||
| ContainerB: containerDst, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return complete(ctx) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| # SHARE_PS_NAMESPACE edge | ||
| # There's 2 pods here so we can also test we don't mix both pods shared NS together. | ||
| apiVersion: v1 | ||
| kind: Pod | ||
| metadata: | ||
| name: sharedps-pod1 | ||
| labels: | ||
| app: kubehound-edge-test | ||
| spec: | ||
| shareProcessNamespace: true | ||
| containers: | ||
| - name: sharedps-pod1-a | ||
| image: ubuntu | ||
| command: [ "/bin/sh", "-c", "--" ] | ||
| args: [ "while true; do sleep 30; done;" ] | ||
| - name: sharedps-pod1-b | ||
| image: ubuntu | ||
| command: [ "/bin/sh", "-c", "--" ] | ||
| args: [ "while true; do sleep 30; done;" ] | ||
| - name: sharedps-pod1-c | ||
| image: ubuntu | ||
| command: [ "/bin/sh", "-c", "--" ] | ||
| args: [ "while true; do sleep 30; done;" ] | ||
| --- | ||
| apiVersion: v1 | ||
| kind: Pod | ||
| metadata: | ||
| name: sharedps-pod2 | ||
| labels: | ||
| app: kubehound-edge-test | ||
| spec: | ||
| shareProcessNamespace: true | ||
| containers: | ||
| - name: sharedps-pod2-a | ||
| image: ubuntu | ||
| command: [ "/bin/sh", "-c", "--" ] | ||
| args: [ "while true; do sleep 30; done;" ] | ||
| - name: sharedps-pod2-b | ||
| image: ubuntu | ||
| command: [ "/bin/sh", "-c", "--" ] | ||
| args: [ "while true; do sleep 30; done;" ] |
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