收集 Cloud NAT 記錄

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本文說明如何啟用 Google Cloud 遙測資料擷取功能,以便收集 Cloud NAT 記錄,以及 Cloud NAT 記錄的記錄欄位如何對應至 Google Security Operations 統一資料模型 (UDM) 欄位。

詳情請參閱「將資料擷取至 Google Security Operations」。

一般部署作業會啟用 Cloud NAT 記錄,以便將記錄擷取至 Google Security Operations。每個客戶的部署作業可能會與此表示方式不同,也可能更複雜。

部署作業包含下列元件:

  • Google Cloud:您收集記錄的 Google Cloud 服務和產品。

  • Cloud NAT 記錄:已啟用可擷取至 Google Security Operations 的 Cloud NAT 記錄。

  • Google Security Operations:Google Security Operations 會保留並分析 Cloud NAT 的記錄。

擷取標籤會標示剖析器,將原始記錄資料正規化為具結構性的 UDM 格式。本文中的資訊適用於使用 GCP_CLOUD_NAT 攝入標籤的剖析器。

事前準備

  • 請確認部署架構中的所有系統都已設定為世界標準時間。

設定 Google Cloud 以擷取 Cloud NAT 記錄

如要進一步瞭解如何將記錄擷取至 Google Security Operations,請參閱「將記錄擷取至 Google Security Operations」一文。 Google Cloud

如果在擷取 Cloud NAT 記錄時遇到問題,請與 Google 安全作業支援團隊聯絡。

支援的 Cloud NAT 記錄格式

Cloud NAT 剖析器支援 JSON 格式的記錄。

支援的 Cloud NAT 記錄範例

  • JSON:

    {
      "insertId": "1q5ys57f36f47d",
      "jsonPayload": {
        "endpoint": {
          "region": "us-central1",
          "project_id": "chronical-0001",
          "vm_name": "vm-1",
          "zone": "us-central1-a"
        },
        "connection": {
          "src_port": 100,
          "nat_port": 101,
          "dest_port": 102,
          "dest_ip": "198.51.100.15",
          "src_ip": "198.51.100.10",
          "protocol": 6,
          "nat_ip": "198.51.100.30"
        },
        "destination": {
          "geo_location": {
            "continent": "America",
            "asn": 54113,
            "country": "usa"
          }
        },
        "allocation_status": "OK",
        "gateway_identifiers": {
          "router_name": "test-rw",
          "gateway_name": "test-nat-vm",
          "region": "us-central1"
        },
        "vpc": {
          "subnetwork_name": "my-subnet-nat",
          "vpc_name": "test-vpc-nat",
          "project_id": "chronical-0001"
        }
      },
      "resource": {
        "type": "nat_gateway",
        "labels": {
          "region": "us-central1",
          "router_id": "8792319260929386950",
          "project_id": "chronical-0001",
          "gateway_name": "test-nat-vm"
        }
      },
      "timestamp": "2023-10-13T05:40:32.217836735Z",
      "labels": {
        "nat.googleapis.com/network_name": "test-vpc-nat",
        "nat.googleapis.com/router_name": "test-rw",
        "nat.googleapis.com/nat_ip": "198.51.100.0",
        "nat.googleapis.com/instance_name": "vm-1",
        "nat.googleapis.com/instance_zone": "us-central1-a",
        "nat.googleapis.com/subnetwork_name": "my-subnet-nat"
      },
      "logName": "projects/chronical-0001/logs/compute.googleapis.com%2Fnat_flows",
      "receiveTimestamp": "2023-10-13T05:40:44.062385884Z"
    }
    

欄位對應參考資料

本節說明 Google Security Operations 剖析器如何將 Cloud NAT 欄位對應至 Google Security Operations 統一資料模型 (UDM) 欄位。

Log field UDM mapping Logic
metadata.event_type The metadata.event_type UDM field is set to NETWORK_CONNECTION.
metadata.product_name The metadata.product_name UDM field is set to GCP Cloud NAT.
metadata.vendor_name The metadata.vendor_name UDM field is set to Google Cloud Platform.
receiveTimestamp metadata.collected_timestamp
timestamp metadata.event_timestamp
logName security_result.category_details
insertId metadata.product_log_id
network.direction The network.direction UDM field is set to OUTBOUND.
network.ip_protocol If the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to ICMP.
  • 1
  • ICMP
  • ICMPV6
  • 58
  • 1.0
  • 58.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to IGMP.
  • 2
  • IGMP
  • 2.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to TCP.
  • 6
  • TCP
  • 6.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to UDP.
  • 17
  • UDP
  • 17.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to IP6IN4.
  • 41
  • IP6IN4
  • 41.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to GRE.
  • 47
  • GRE
  • 47.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to ESP.
  • 50
  • ESP
  • 50.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to EIGRP.
  • 88
  • EIGRP
  • 88.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to ETHERIP.
  • 97
  • ETHERIP
  • 97.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to PIM.
  • 103
  • PIM
  • 103.0
Else, if the jsonPayload.connection.protocol log field value contains one of the following values, then the network.ip_protocol UDM field is set to VRRP.
  • 112
  • VRRP
  • 112.0
jsonPayload.connection.src_ip principal.ip
jsonPayload.connection.src_port principal.port
jsonPayload.connection.nat_ip principal.nat_ip
jsonPayload.connection.nat_port principal.nat_port
jsonPayload.vpc.project_id intermediary.resource_ancestors.name If the jsonPayload.vpc.project_id log field value is not empty, then the //cloudresourcemanager.googleapis.com/projects/%{jsonPayload.vpc.project_id} log field is mapped to the intermediary.resource_ancestors.name UDM field.
intermediary.resource_ancestors.resource_type If the jsonPayload.vpc.project_id log field value is not empty, then the intermediary.resource_ancestors.resource_type UDM field is set to CLOUD_PROJECT.
intermediary.resource_ancestors.attribute.cloud.environment If the jsonPayload.vpc.project_id log field value is not empty, then the intermediary.resource_ancestors.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
jsonPayload.vpc.vpc_name intermediary.resource_ancestors.name
intermediary.resource_ancestors.resource_type If the jsonPayload.vpc.vpc_name log field value is not empty or the jsonPayload.vpc.subnetwork_name log field value is not empty, then the intermediary.resource_ancestors.resource_type UDM field is set to VPC_NETWORK.
intermediary.resource_ancestors.attribute.cloud.environment If the jsonPayload.vpc.vpc_name log field value is not empty or the jsonPayload.vpc.subnetwork_name log field value is not empty, then the intermediary.resource_ancestors.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
jsonPayload.vpc.subnetwork_name intermediary.resource_ancestors.attribute.labels [vpc_subnetwork_name]
jsonPayload.gateway_identifiers.gateway_name intermediary.resource.name
intermediary.resource.resource_type If the jsonPayload.gateway_identifiers.gateway_name log field value is not empty or the resource.type log field value is not empty or the resource.labels.region log field value is not empty or the jsonPayload.gateway_identifiers.router_name log field value is not empty or the resource.labels.router_id log field value is not empty, then the intermediary.resource.resource_type UDM field is set to BACKEND_SERVICE.
resource.type intermediary.resource.resource_subtype
jsonPayload.gateway_identifiers.region intermediary.location.name
intermediary.resource.attribute.cloud.environment If the jsonPayload.gateway_identifiers.gateway_name log field value is not empty or the resource.type log field value is not empty or the resource.labels.region log field value is not empty or the jsonPayload.gateway_identifiers.router_name log field value is not empty or the resource.labels.router_id log field value is not empty, then the intermediary.resource.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
resource.labels.region intermediary.resource.attribute.cloud.availability_zone
jsonPayload.gateway_identifiers.router_name intermediary.resource.attribute.labels [gateway_identifiers_router_name]
resource.labels.router_id intermediary.resource.attribute.labels [resource_labels_router_id]
jsonPayload.endpoint.project_id principal.resource_ancestors.name If the jsonPayload.endpoint.project_id log field value is not empty, then the //cloudresourcemanager.googleapis.com/projects/%{jsonPayload.endpoint.project_id} log field is mapped to the principal.resource_ancestors.name UDM field.
principal.resource_ancestors.resource_type If the jsonPayload.endpoint.project_id log field value is not empty, then the principal.resource_ancestors.resource_type UDM field is set to CLOUD_PROJECT.
principal.resource_ancestors.attribute.cloud.environment If the jsonPayload.endpoint.project_id log field value is not empty, then the principal.resource_ancestors.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
jsonPayload.endpoint.vm_name principal.hostname
jsonPayload.endpoint.vm_name principal.asset.hostname
jsonPayload.endpoint.vm_name principal.resource.name
principal.resource.resource_type If the jsonPayload.endpoint.vm_name log field value is not empty or the jsonPayload.endpoint.zone log field value is not empty, then the principal.resource.resource_type UDM field is set to VIRTUAL_MACHINE.
principal.resource.attribute.cloud.environment If the jsonPayload.endpoint.vm_name log field value is not empty or the jsonPayload.endpoint.zone log field value is not empty, then the principal.resource.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
jsonPayload.endpoint.zone principal.resource.attribute.cloud.availability_zone
jsonPayload.endpoint.region principal.location.name
jsonPayload.connection.dest_ip target.ip
jsonPayload.connection.dest_port target.port
jsonPayload.destination.geo_location.city target.location.city
jsonPayload.destination.geo_location.country target.location.country_or_region
jsonPayload.destination.geo_location.region target.location.name
jsonPayload.destination.geo_location.continent target.labels [destination_geo_location_continent] (deprecated)
jsonPayload.destination.geo_location.continent additional.fields [destination_geo_location_continent]
jsonPayload.destination.geo_location.asn network.asn
jsonPayload.destination.instance.project_id target.resource_ancestors.name If the jsonPayload.destination.instance.project_id log field value is not empty, then the //cloudresourcemanager.googleapis.com/projects/%{jsonPayload.destination.instance.project_id} log field is mapped to the target.resource_ancestors.name UDM field.
target.resource_ancestors.resource_type If the jsonPayload.destination.instance.project_id log field value is not empty, then the target.resource_ancestors.resource_type UDM field is set to CLOUD_PROJECT.
target.resource_ancestors.attribute.cloud.environment If the jsonPayload.destination.instance.project_id log field value is not empty, then the target.resource_ancestors.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
jsonPayload.destination.instance.vm_name target.hostname
jsonPayload.destination.instance.vm_name target.asset.hostname
jsonPayload.destination.instance.vm_name target.resource.name
target.resource.resource_type If the jsonPayload.destination.instance.vm_name log field value is not empty, then the target.resource_ancestors.resource_type UDM field is set to VIRTUAL_MACHINE.
target.resource.attribute.cloud.environment If the jsonPayload.destination.instance.vm_name log field value is not empty, then the target.resource.attribute.cloud.environment UDM field is set to GOOGLE_CLOUD_PLATFORM.
jsonPayload.destination.instance.zone target.resource.attribute.cloud.availability_zone
jsonPayload.destination.instance.region target.location.name If the jsonPayload.destination.geo_location.region log field value is empty, then the jsonPayload.destination.instance.region log field is mapped to the target.location.name UDM field.
security_result.action If the jsonPayload.allocation_status log field value is equal to OK, then the security_result.action UDM field is set to ALLOW.

Else, if the jsonPayload.allocation_status log field value is equal to DROPPED, then the security_result.action UDM field is set to BLOCK.
jsonPayload.allocation_status security_result.action_details
labels about.resource.attribute.labels
resource.labels.project_id about.resource.attribute.labels [resource_project_id] If the resource.labels.project_id log field value is not empty, then the //cloudresourcemanager.googleapis.com/projects/%{resource.labels.project_id} log field is mapped to the about.resource.attribute.labels.resource_project_id UDM field.
resource.labels.gateway_name about.resource.attribute.labels [resource_gateway_name]

後續步驟

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