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Signed-off-by: Thomas Labarussias <issif+github@gadz.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,259 @@ | ||
| package sysdig | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/falcosecurity/falco-talon/internal/events" | ||
| k8sChecks "github.com/falcosecurity/falco-talon/internal/kubernetes/checks" | ||
| k8s "github.com/falcosecurity/falco-talon/internal/kubernetes/client" | ||
| "github.com/falcosecurity/falco-talon/internal/models" | ||
| "github.com/falcosecurity/falco-talon/internal/rules" | ||
| "github.com/falcosecurity/falco-talon/utils" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| ) | ||
|
|
||
| const ( | ||
| Name string = "sysdig" | ||
| Category string = "kubernetes" | ||
| Description string = "Capture the syscalls packets in a pod" | ||
| Source string = "syscalls" | ||
| Continue bool = false | ||
| UseContext bool = false | ||
| AllowOutput bool = false | ||
| RequireOutput bool = true | ||
| Permissions string = `apiVersion: rbac.authorization.k8s.io/v1 | ||
| kind: ClusterRole | ||
| metadata: | ||
| name: falco-talon | ||
| rules: | ||
| - apiGroups: | ||
| - "" | ||
| resources: | ||
| - pods | ||
| verbs: | ||
| - get | ||
| - list | ||
| - apiGroups: | ||
| - "" | ||
| resources: | ||
| - pods/exec | ||
| verbs: | ||
| - get | ||
| - create | ||
| ` | ||
| Example string = `- action: Create a syscall capture from a pod | ||
| actionner: kubernetes:sysdig | ||
| parameters: | ||
| duration: 10 | ||
| snaplen: 1024 | ||
| output: | ||
| target: aws:s3 | ||
| parameters: | ||
| bucket: my-bucket | ||
| prefix: /captures/ | ||
| ` | ||
| ) | ||
|
|
||
| var ( | ||
| RequiredOutputFields = []string{"k8s.ns.name", "k8s.pod.name"} | ||
| ) | ||
|
|
||
| type Parameters struct { | ||
| Image string `mapstructure:"image"` | ||
| Duration int `mapstructure:"duration" validate:"gte=0"` | ||
| BufferSize int `mapstructure:"buffer_size" validate:"gte=0"` | ||
| } | ||
|
|
||
| const ( | ||
| baseName string = "falco-talon-sysdig-" | ||
| defaultImage string = "sysdig/sysdig:latest" | ||
| defaultTTL int = 60 | ||
| defaultDuration int = 5 | ||
| defaultMaxDuration int = 30 | ||
| defaultBufferSize int = 2048 | ||
| ) | ||
|
|
||
| type Actionner struct{} | ||
|
|
||
| func Register() *Actionner { | ||
| return new(Actionner) | ||
| } | ||
|
|
||
| func (a Actionner) Init() error { | ||
| return k8s.Init() | ||
| } | ||
|
|
||
| func (a Actionner) Information() models.Information { | ||
| return models.Information{ | ||
| Name: Name, | ||
| FullName: Category + ":" + Name, | ||
| Category: Category, | ||
| Description: Description, | ||
| Source: Source, | ||
| RequiredOutputFields: RequiredOutputFields, | ||
| Permissions: Permissions, | ||
| Example: Example, | ||
| Continue: Continue, | ||
| AllowOutput: AllowOutput, | ||
| RequireOutput: RequireOutput, | ||
| } | ||
| } | ||
|
|
||
| func (a Actionner) Parameters() models.Parameters { | ||
| return Parameters{ | ||
| Duration: defaultDuration, | ||
| BufferSize: defaultBufferSize, | ||
| Image: defaultImage, | ||
| } | ||
| } | ||
|
|
||
| func (a Actionner) Checks(event *events.Event, _ *rules.Action) error { | ||
| return k8sChecks.CheckPodExist(event) | ||
| } | ||
|
|
||
| func (a Actionner) Run(event *events.Event, action *rules.Action) (utils.LogLine, *models.Data, error) { | ||
| podName := event.GetPodName() | ||
| namespace := event.GetNamespaceName() | ||
|
|
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| objects := map[string]string{ | ||
| "pod": podName, | ||
| "namespace": namespace, | ||
| } | ||
|
|
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| var parameters Parameters | ||
| err := utils.DecodeParams(action.GetParameters(), ¶meters) | ||
| if err != nil { | ||
| return utils.LogLine{ | ||
| Objects: nil, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
|
|
||
| if parameters.Duration == 0 { | ||
| parameters.Duration = defaultDuration | ||
| } | ||
|
|
||
| if parameters.Duration > 30 { | ||
| parameters.Duration = defaultMaxDuration | ||
| } | ||
|
|
||
| if parameters.Image == "" { | ||
| parameters.Image = defaultImage | ||
| } | ||
|
|
||
| client := k8s.GetClient() | ||
|
|
||
| pod, _ := client.GetPod(podName, namespace) | ||
| containers := k8s.GetContainers(pod) | ||
| if len(containers) == 0 { | ||
| err = fmt.Errorf("no container found") | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
|
|
||
| job, err := client.CreateJob("falco-talon-sysdig", namespace, parameters.Image, pod.Namespace, defaultTTL) | ||
| if err != nil { | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
|
|
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| objects["job"] = job | ||
|
|
||
| timeout := time.NewTimer(20 * time.Second) | ||
| ticker := time.NewTicker(300 * time.Millisecond) | ||
| defer timeout.Stop() | ||
| defer ticker.Stop() | ||
|
|
||
| var ready bool | ||
| var jPod, jContainer string | ||
| for !ready { | ||
| select { | ||
| case <-timeout.C: | ||
| err = fmt.Errorf("the job '%v' in the namespace '%v' for the sysdig capture is not ready", job, namespace) | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| case <-ticker.C: | ||
| p, err := client.ListPods(metav1.ListOptions{LabelSelector: "batch.kubernetes.io/job-name=" + job}) | ||
| if err != nil { | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
| if len(p.Items) > 0 { | ||
| if p.Items[0].Status.Phase == corev1.PodRunning && p.Items[0].Status.ContainerStatuses[0].Ready { | ||
| jPod = p.Items[0].Name | ||
| jContainer = p.Items[0].Spec.Containers[0].Name | ||
| ready = true | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| command := []string{"tee", "/tmp/talon-script.sh", "/dev/null"} | ||
| script := fmt.Sprintf("sysdig --modern-bpf --cri /host/run/containerd/containerd.sock -M %v -s %v -z -w /tmp/sysdig.scap.gz || [ $? -eq 0 ] && echo OK || exit 1\n", parameters.Duration, parameters.BufferSize) | ||
| // script := fmt.Sprintf("sysdig --modern-bpf --cri /host/run/containerd.sock --cri /host/run/docker.sock --cri /host/run/crio.sock -M %v -s %v -z -w /tmp/sysdig.scap.gz || [ $? -eq 1 ] && echo OK || exit 1\n", parameters.Duration, parameters.BufferSize) | ||
| _, err = client.Exec(namespace, jPod, jContainer, command, script) | ||
| if err != nil { | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
|
|
||
| command = []string{"sh", "/tmp/talon-script.sh"} | ||
| _, err = client.Exec(namespace, jPod, jContainer, command, "") | ||
| if err != nil { | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
|
|
||
| command = []string{"cat", "/tmp/sysdig.scap.gz"} | ||
| output, err := client.Exec(namespace, jPod, jContainer, command, "") | ||
| if err != nil { | ||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Error: err.Error(), | ||
| Status: utils.FailureStr, | ||
| }, nil, err | ||
| } | ||
|
|
||
| return utils.LogLine{ | ||
| Objects: objects, | ||
| Output: fmt.Sprintf("a sysdig capture '%v' has been created", "sysdig.scap.gz"), | ||
| Status: utils.SuccessStr, | ||
| }, &models.Data{Name: "sysdig.scap.gz", Objects: objects, Bytes: output.Bytes()}, nil | ||
| } | ||
|
|
||
| func (a Actionner) CheckParameters(action *rules.Action) error { | ||
| var parameters Parameters | ||
|
|
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| err := utils.DecodeParams(action.GetParameters(), ¶meters) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| err = utils.ValidateStruct(parameters) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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