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Google Cloud IDS ログを収集する

このドキュメントでは、Google Security Operations への Google Cloud テレメトリーの取り込みを有効にして Google Cloud DNS ログを収集する方法と、Google Cloud DNS ログのログフィールドが Google Security Operations の統合データモデル（UDM）フィールドにマッピングする方法について説明します。

詳細については、Google Security Operations　へのデータの取り込みの概要をご覧ください。

一般的なデプロイは、Google Security Operations への取り込みが有効になっている Google Cloud IDS ログで構成されています。お客様のデプロイはそれぞれこの表現とは異なる可能性があり、より複雑になることがあります。

デプロイには次のコンポーネントが含まれます。

Google Cloud: ログの収集元となる Google Cloud のサービスとプロダクト。
Google Cloud IDS のログ: Google Security Operations への取り込みが有効になっている Google Cloud IDS のログ。
Google Security Operations: Google Security Operations が Google Cloud IDS のログを保持して分析します。

取り込みラベルによって、未加工のログデータを構造化 UDM 形式に正規化するパーサーが識別されます。このドキュメントの情報は、取り込みラベル GCP_IDS が付加されたパーサーに適用されます。

準備

デプロイアーキテクチャ内のすべてのシステムが、UTC タイムゾーンに構成されていることを確認します。

Google Cloud IDS ログを取り込むように Google Cloud を構成する

Google Cloud IDS ログを Google Security Operations に取り込むには、 Google Cloud のログを Google Security Operations に取り込むのページの手順に沿って操作します。

Google Cloud IDS ログを取り込むときに問題が発生した場合は、Google Security Operations サポートにお問い合わせください。

サポートされている Google Cloud IDS ログ形式

Google Cloud IDS パーサーは JSON 形式のログをサポートしています。

サポートされている Google Cloud IDS サンプルログ

JSON:

{
  "insertId": "5cb7ac422679042bcd8f0a84700c23c0-1@a1",
  "jsonPayload": {
    "alert_severity": "INFORMATIONAL",
    "alert_time": "2021-09-08T12:10:19Z",
    "application": "ssl",
    "category": "protocol-anomaly",
    "destination_ip_address": "198.51.100.0",
    "destination_port": "443",
    "details": "This signature detects suspicious and non-RFC compliant SSL traffic on port 443. This could be associated with applications sending non SSL traffic using port 443 or indicate possible malicious activity.",
    "direction": "client-to-server",
    "ip_protocol": "tcp",
    "name": "Non-RFC Compliant SSL Traffic on Port 443",
    "network": "abcd-prod-pod111-shared",
    "repeat_count": "1",
    "session_id": "1457377",
    "source_ip_address": "198.51.100.0",
    "source_port": "62543",
    "threat_id": "56112",
    "type": "vulnerability",
    "uri_or_filename": ""
  },
  "logName": "projects/abcd-prod-mnop-pod555-infra/logs/ids.googleapis.com%2Fthreat",
  "receiveTimestamp": "2021-09-08T12:10:23.953458826Z",
  "resource": {
    "labels": {
      "id": "abcd-prod-mnop-pod555-cloudidsendpoint-info",
      "location": "us-central1-a",
      "resource_container": "projects/158110290042"
    },
    "type": "ids.googleapis.com/Endpoint"
  },
  "timestamp": "2021-09-08T12:10:19Z"
}

フィールドマッピングリファレンス

フィールドマッピングリファレンス: GCP_IDS

次の表に、GCP_IDS ログタイプのログフィールドと、対応する UDM フィールドを示します。

Log field	UDM mapping	Logic
`insertId`	`metadata.product_log_id`
`jsonPayload.alert_severity`	`security_result.severity`
`jsonPayload.alert_time`	`metadata.event_timestamp`
`jsonPayload.application`	`principal.application`	If the `jsonPayload.direction` log field value is equal to `server-to-client`, then the `jsonPayload.application` log field is mapped to the `principal.application` UDM field.
`jsonPayload.application`	`target.application`	If the `jsonPayload.direction` log field value is equal to `client-to-server` or the `logName` log field value matches the regular expression pattern `traffic`, then the `jsonPayload.application` log field is mapped to the `target.application` UDM field.
`jsonPayload.category`	`security_result.category_details`
`jsonPayload.cves`	`extensions.vulns.vulnerabilities.cve_id`	If the `jsonPayload.cves` log field value is not empty, then the `jsonPayload.cves` log field is mapped to the `extensions.vulns.vulnerabilities.cve_id` UDM field.
`jsonPayload.destination_ip_address`	`target.ip`
`jsonPayload.destination_port`	`target.port`
`jsonPayload.details`	`extensions.vulns.vulnerabilities.description`	If the `jsonPayload.cves` log field value is not empty, then the `jsonPayload.details` log field is mapped to the `extensions.vulns.vulnerabilities.description` UDM field.
`jsonPayload.direction`	`network.direction`	If the `jsonPayload.direction` log field value is equal to `client-to-server`, then the `network.direction` UDM field is set to `OUTBOUND`. Else, if the `jsonPayload.direction` log field value is equal to `server-to-client`, then the `network.direction` UDM field is set to `INBOUND`.
`jsonPayload.elapsed_time`	`network.session_duration.seconds`
`jsonPayload.ip_protocol`	`network.ip_protocol`	If the `jsonPayload.ip_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.ip_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.ip_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.ip_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.ip_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.ip_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.ip_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.ip_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.ip_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.ip_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.ip_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.name`	`security_result.threat_name`
`jsonPayload.network`	`target.resource.name`	If the `jsonPayload.direction` log field value is equal to `client-to-server` or the `logName` log field value matches the regular expression pattern `traffic`, then the `jsonPayload.network` log field is mapped to the `target.resource.name` UDM field.
`jsonPayload.network`	`principal.resource.name`	If the `jsonPayload.direction` log field value is equal to `server-to-client`, then the `jsonPayload.network` log field is mapped to the `principal.resource.name` UDM field.
	`target.resource.resource_type`	If the `jsonPayload.direction` log field value is equal to `client-to-server` or the `logName` log field value matches the regular expression pattern `traffic`, then the `target.resource.resource_type` UDM field is set to `VPC_NETWORK`.
	`principal.resource.resource_type`	If the `jsonPayload.direction` log field value is equal to `server-to-client`, then the `principal.resource.resource_type` UDM field is set to `VPC_NETWORK`.
`jsonPayload.repeat_count`	`security_result.detection_fields[repeat_count]`
`jsonPayload.session_id`	`network.session_id`
`jsonPayload.source_ip_address`	`principal.ip`
`jsonPayload.source_port`	`principal.port`
`jsonPayload.start_time`	`about.labels[start_time]` (deprecated)
`jsonPayload.start_time`	`additional.fields[start_time]`
`jsonPayload.threat_id`	`security_result.threat_id`
`jsonPayload.total_bytes`	`about.labels[total_bytes]` (deprecated)
`jsonPayload.total_bytes`	`additional.fields[total_bytes]`
`jsonPayload.total_packets`	`about.labels[total_packets]` (deprecated)
`jsonPayload.total_packets`	`additional.fields[total_packets]`
`jsonPayload.type`	`security_result.detection_fields[type]`
`jsonPayload.uri_or_filename`	`target.file.full_path`
`logName`	`security_result.category_details`
`receiveTimestamp`	`metadata.collected_timestamp`
`resource.labels.id`	`observer.resource.product_object_id`
`resource.labels.location`	`observer.location.name`
`resource.labels.resource_container`	`observer.resource.name`
`resource.type`	`observer.resource.resource_subtype`
`timestamp`	`metadata.event_timestamp`	If the `logName` log field value matches the regular expression pattern `traffic`, then the `timestamp` log field is mapped to the `metadata.event_timestamp` UDM field.
	`observer.resource.resource_type`	The `observer.resource.resource_type` UDM field is set to `CLOUD_PROJECT`.
	`observer.resource.attribute.cloud.environment`	The `observer.resource.attribute.cloud.environment` UDM field is set to `GOOGLE_CLOUD_PLATFORM`.
	`security_result.category`	If the `jsonPayload.category` log field value is equal to `dos`, then the `security_result.category` UDM field is set to `NETWORK_DENIAL_OF_SERVICE`. Else, if the `jsonPayload.category` log field value is equal to `info-leak`, then the `security_result.category` UDM field is set to `NETWORK_SUSPICIOUS`. Else, if the `jsonPayload.category` log field value is equal to `protocol-anomaly`, then the `security_result.category` UDM field is set to `NETWORK_MALICIOUS`. Else, if the `jsonPayload.category` log field value contains one of the following values, then the `security_result.category` UDM field is set to `SOFTWARE_MALICIOUS`. `backdoor` `spyware` `trojan`
	`extensions.vulns.vulnerabilities.vendor`	if the `jsonPayload.cves` log field value is not empty, then the `extensions.vulns.vulnerabilities.vendor` UDM field is set to `GCP_IDS`.
	`metadata.product_name`	The `metadata.product_name` UDM field is set to `GCP_IDS`.
	`metadata.vendor_name`	The `metadata.vendor_name` UDM field is set to `Google Cloud Platform`.
	`metadata.event_type`	If the `jsonPayload.cves` log field value is not empty, then the `metadata.event_type` UDM field is set to `SCAN_VULN_NETWROK`. Else, if the `jsonPayload.source_ip_address` log field value is not empty, then the `metadata.event_type` UDM field is set to `SCAN_NETWORK`. Else, the `metadata.event_type` UDM field is set to `GENERIC_EVENT`.

次のステップ

Google Security Operations へのデータの取り込み

さらにサポートが必要な場合 コミュニティメンバーや Google SecOps のプロフェッショナルから回答を得ることができます。