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add new actionner calico:networkpolicy (#173)
Signed-off-by: Thomas Labarussias <issif+github@gadz.org>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,183 @@ | ||
package networkpolicy | ||
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import ( | ||
"context" | ||
"encoding/json" | ||
"fmt" | ||
"strconv" | ||
"strings" | ||
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networkingv3 "github.com/projectcalico/api/pkg/apis/projectcalico/v3" | ||
"github.com/projectcalico/api/pkg/lib/numorstring" | ||
errorsv1 "k8s.io/apimachinery/pkg/api/errors" | ||
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
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calico "github.com/Falco-Talon/falco-talon/internal/calico/client" | ||
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"github.com/Falco-Talon/falco-talon/internal/events" | ||
kubernetes "github.com/Falco-Talon/falco-talon/internal/kubernetes/client" | ||
"github.com/Falco-Talon/falco-talon/internal/rules" | ||
"github.com/Falco-Talon/falco-talon/utils" | ||
) | ||
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func Action(_ *rules.Action, event *events.Event) (utils.LogLine, error) { | ||
podName := event.GetPodName() | ||
namespace := event.GetNamespaceName() | ||
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objects := map[string]string{ | ||
"pod": podName, | ||
"namespace": namespace, | ||
} | ||
k8sClient := kubernetes.GetClient() | ||
calicoClient := calico.GetClient() | ||
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pod, err := k8sClient.GetPod(podName, namespace) | ||
if err != nil { | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err.Error(), | ||
Status: "failure", | ||
}, | ||
err | ||
} | ||
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var owner string | ||
labels := make(map[string]string) | ||
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if len(pod.OwnerReferences) != 0 { | ||
switch pod.OwnerReferences[0].Kind { | ||
case "DaemonSet": | ||
u, err2 := k8sClient.GetDaemonsetFromPod(pod) | ||
if err2 != nil { | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err2.Error(), | ||
Status: "failure", | ||
}, | ||
err2 | ||
} | ||
owner = u.ObjectMeta.Name | ||
labels = u.Spec.Selector.MatchLabels | ||
case "StatefulSet": | ||
u, err2 := k8sClient.GetStatefulsetFromPod(pod) | ||
if err2 != nil { | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err2.Error(), | ||
Status: "failure", | ||
}, | ||
err2 | ||
} | ||
owner = u.ObjectMeta.Name | ||
labels = u.Spec.Selector.MatchLabels | ||
case "ReplicaSet": | ||
u, err2 := k8sClient.GetReplicasetFromPod(pod) | ||
if err2 != nil { | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err2.Error(), | ||
Status: "failure", | ||
}, | ||
err2 | ||
} | ||
owner = u.ObjectMeta.Name | ||
labels = u.Spec.Selector.MatchLabels | ||
} | ||
} else { | ||
owner = pod.ObjectMeta.Name | ||
labels = pod.ObjectMeta.Labels | ||
} | ||
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if owner == "" || len(labels) == 0 { | ||
err3 := fmt.Errorf("can't find the owner and/or labels for the pod '%v' in the namespace '%v'", podName, namespace) | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err3.Error(), | ||
Status: "failure", | ||
}, | ||
err3 | ||
} | ||
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delete(labels, "pod-template-hash") | ||
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payload := networkingv3.NetworkPolicy{ | ||
ObjectMeta: metav1.ObjectMeta{ | ||
Name: owner, | ||
Namespace: namespace, | ||
Labels: labels, | ||
}, | ||
Spec: networkingv3.NetworkPolicySpec{ | ||
Types: []networkingv3.PolicyType{networkingv3.PolicyTypeEgress}, | ||
}, | ||
} | ||
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var selector string | ||
for i, j := range labels { | ||
selector += fmt.Sprintf(`%v == "%v" &&`, i, j) | ||
} | ||
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payload.Spec.Selector = strings.TrimSuffix(selector, " &&") | ||
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r, err := createEgressRule(event) | ||
if err != nil { | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err.Error(), | ||
Status: "failure", | ||
}, | ||
err | ||
} | ||
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if r != nil { | ||
payload.Spec.Egress = []networkingv3.Rule{*r} | ||
} | ||
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j, _ := json.Marshal(payload) | ||
fmt.Println(string(j)) | ||
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var output string | ||
_, err = calicoClient.ProjectcalicoV3().NetworkPolicies(namespace).List(context.Background(), metav1.ListOptions{}) | ||
if errorsv1.IsNotFound(err) { | ||
_, err = calicoClient.ProjectcalicoV3().NetworkPolicies(namespace).Create(context.Background(), &payload, metav1.CreateOptions{}) | ||
output = fmt.Sprintf("the networkpolicy '%v' in the namespace '%v' has been created", owner, namespace) | ||
} else { | ||
_, err = calicoClient.ProjectcalicoV3().NetworkPolicies(namespace).Update(context.Background(), &payload, metav1.UpdateOptions{}) | ||
output = fmt.Sprintf("the networkpolicy '%v' in the namespace '%v' has been updated", owner, namespace) | ||
} | ||
if err != nil { | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Error: err.Error(), | ||
Status: "failure", | ||
}, | ||
err | ||
} | ||
objects["NetworkPolicy"] = owner | ||
return utils.LogLine{ | ||
Objects: objects, | ||
Output: output, | ||
Status: "success", | ||
}, | ||
nil | ||
} | ||
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func createEgressRule(event *events.Event) (*networkingv3.Rule, error) { | ||
port, err := strconv.ParseUint(event.GetRemotePort(), 0, 16) | ||
if err != nil { | ||
return nil, err | ||
} | ||
r := networkingv3.Rule{ | ||
Action: "Deny", | ||
Destination: networkingv3.EntityRule{ | ||
Nets: []string{event.GetRemoteIP()}, | ||
Ports: []numorstring.Port{ | ||
{ | ||
MinPort: uint16(port), | ||
MaxPort: uint16(port), | ||
}, | ||
}, | ||
}, | ||
} | ||
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return &r, nil | ||
} |
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