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Как собирать события?
| How to collect events
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Поды runtime-audit-engine выводят все события в стандартный вывод.
Далее агенты log-shipper могут собирать их и отправлять в хранилище логов.
| Pods of runtime-audit-engine output all events to stdout.
Those events can then be collected by log-shipper-agents and sent to any supported destination.
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Пример конфигурации ClusterLoggingConfig для модуля log-shipper:
| Below is an example ClusterLoggingConfig configuration for the log-shipper module:
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yaml
apiVersion: deckhouse.io/v1alpha1
kind: ClusterLoggingConfig
metadata:
name: falco-events
spec:
destinationRefs:
- xxxx
kubernetesPods:
namespaceSelector:
matchNames:
- d8-runtime-audit-engine
labelFilter:
- operator: Regex
values: [”\{.*”] # to collect only JSON logs
field: “message”
type: KubernetesPods
| yaml
apiVersion: deckhouse.io/v1alpha1
kind: ClusterLoggingConfig
metadata:
name: falco-events
spec:
destinationRefs:
- xxxx
kubernetesPods:
namespaceSelector:
matchNames:
- d8-runtime-audit-engine
labelFilter:
- operator: Regex
values: [”\{.*”] # to collect only JSON logs
field: “message”
type: KubernetesPods
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Как оповещать о критических событиях?
| How to create an alert
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Prometheus автоматически собирает метрики о событиях.
Чтобы включить оповещения, добавьте в кластер правило CustomPrometheusRule.
| All metrics are automatically collected by Prometheus. Add a CustomPrometheusRule to enable alerts.
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Пример настройки такого правила:
| Example:
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yaml
apiVersion: deckhouse.io/v1
kind: CustomPrometheusRules
metadata:
name: falco-critical-alerts
spec:
groups:
- name: falco-critical-alerts
rules:
- alert: FalcoCriticalAlertsAreFiring
for: 1m
annotations:
description: |
There is a suspicious activity on a node {{ $labels.node }}.
Check you events journal for more details.
summary: Falco detects a critical security incident
expr: |
sum by (node) (rate(falco_events{priority=”Critical”}[5m]) > 0)
| yaml
apiVersion: deckhouse.io/v1
kind: CustomPrometheusRules
metadata:
name: falco-critical-alerts
spec:
groups:
- name: falco-critical-alerts
rules:
- alert: FalcoCriticalAlertsAreFiring
for: 1m
annotations:
description: |
There is a suspicious activity on a node {{ $labels.node }}.
Check you events journal for details.
summary: Falco detects a critical security incident
expr: |
sum by (node) (rate(falco_events{priority=”Critical”}[5m]) > 0)
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Алерты лучше всего работают в комбинации с хранилищами событий, такими как Elasticsearch или Loki. Их задача — оповестить пользователя о подозрительном поведении на узле.
После получения алерта рекомендуется «пойти» в хранилище и посмотреть на события, которые его вызвали.
| Alerts work best in combination with event storage, such as Elasticsearch or Loki. Alerts warn the user about suspicious activity on a node.
Once an alert is received, we recommend that you check event storage and examine the events that triggered it.
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Как применить правила для Falco, найденные в интернете?
| How to apply the Falco rules found on the Internet
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Структура правил Falco отличается от схемы CRD.
Это связано со сложностями при проверке правильности ресурсов в Kubernetes.
| The structure of native Falco rules is different from the CRD schema.
It is due to limitations of schema validation capabilities in Kubernetes.
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Скрипт для конвертации правил Falco в ресурсы FalcoAuditRules упрощает процесс миграции и позволять применять правила Falco в Deckhouse:
| The script for converting a Falco rules file into a FalcoAuditRules custom resource makes the process of migrating native Falco rules to Deckhouse more convenient:
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shell
git clone github.com/deckhouse/deckhouse
cd deckhouse/ee/modules/650-runtime-audit-engine/hack/fav-converter
go run main.go -input /path/to/falco/rule_example.yaml > ./my-rules-cr.yaml
| shell
git clone github.com/deckhouse/deckhouse
cd deckhouse/ee/modules/650-runtime-audit-engine/hack/fav-converter
go run main.go -input /path/to/falco/rule_example.yaml > ./my-rules-cr.yaml
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Пример результата работы скрипта:
| Example of a script output:
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yaml
| yaml
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/path/to/falco/rule_example.yaml
- rule: Linux Cgroup Container Escape Vulnerability (CVE-2022-0492)
desc: “This rule detects an attempt to exploit a container escape vulnerability in the Linux Kernel.”
condition: container.id != “” and proc.name = “unshare” and spawned_process and evt.args contains “mount” and evt.args contains “-o rdma” and evt.args contains “/release_agent”
output: “Detect Linux Cgroup Container Escape Vulnerability (CVE-2022-0492) (user=%user.loginname uid=%user.loginuid command=%proc.cmdline args=%proc.args)”
priority: CRITICAL
tags: [process, mitre_privilege_escalation]
| /path/to/falco/rule_example.yaml
- rule: Linux Cgroup Container Escape Vulnerability (CVE-2022-0492)
desc: “This rule detects an attempt to exploit a container escape vulnerability in the Linux Kernel.”
condition: container.id != “” and proc.name = “unshare” and spawned_process and evt.args contains “mount” and evt.args contains “-o rdma” and evt.args contains “/release_agent”
output: “Detect Linux Cgroup Container Escape Vulnerability (CVE-2022-0492) (user=%user.loginname uid=%user.loginuid command=%proc.cmdline args=%proc.args)”
priority: CRITICAL
tags: [process, mitre_privilege_escalation]
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yaml
| yaml
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./my-rules-cr.yaml
apiVersion: deckhouse.io/v1alpha1
kind: FalcoAuditRules
metadata:
name: rule-example
spec:
rules:
- macro:
name: spawned_process
condition: (evt.type in (execve, execveat) and evt.dir=<)
- rule:
name: Linux Cgroup Container Escape Vulnerability (CVE-2022-0492)
condition: container.id != “” and proc.name = “unshare” and spawned_process and evt.args contains “mount” and evt.args contains “-o rdma” and evt.args contains “/release_agent”
desc: This rule detects an attempt to exploit a container escape vulnerability in the Linux Kernel.
output: Detect Linux Cgroup Container Escape Vulnerability (CVE-2022-0492) (user=%user.loginname uid=%user.loginuid command=%proc.cmdline args=%proc.args)
priority: Critical
tags:
- process
- mitre_privilege_escalation
| ./my-rules-cr.yaml
apiVersion: deckhouse.io/v1alpha1
kind: FalcoAuditRules
metadata:
name: rule-example
spec:
rules:
- macro:
name: spawned_process
condition: (evt.type in (execve, execveat) and evt.dir=<)
- rule:
name: Linux Cgroup Container Escape Vulnerability (CVE-2022-0492)
condition: container.id != “” and proc.name = “unshare” and spawned_process and evt.args contains “mount” and evt.args contains “-o rdma” and evt.args contains “/release_agent”
desc: This rule detects an attempt to exploit a container escape vulnerability in the Linux Kernel.
output: Detect Linux Cgroup Container Escape Vulnerability (CVE-2022-0492) (user=%user.loginname uid=%user.loginuid command=%proc.cmdline args=%proc.args)
priority: Critical
tags:
- process
- mitre_privilege_escalation
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