Collecter les journaux Cloud NAT

Ce document explique comment collecter des journaux Cloud NAT en activant l'ingestion de télémétrie de Google Cloud dans Google Security Operations et comment les champs de journaux des journaux Cloud NAT sont mappés avec les champs de modèle de données unifié (UDM, Unified Data Model) de Google Security Operations.

Pour en savoir plus, consultez Ingestion de données dans Google Security Operations.

Un déploiement type comprend des journaux Cloud NAT activés pour l'ingestion dans Google Security Operations. Chaque déploiement client peut différer de cette représentation et être plus complexe.

Le déploiement contient les composants suivants:

• Google Cloud: services et produits Google Cloud à partir desquels vous collectez des journaux.

• Journaux Cloud NAT: journaux Cloud NAT qui sont pour l'ingestion dans Google Security Operations.

• Google Security Operations: Google Security Operations conserve et analyse les journaux provenant de Cloud NAT.

Une étiquette d'ingestion identifie l'analyseur qui normalise les données de journaux brutes au format UDM structuré. Les informations contenues dans ce document s'appliquent à l'analyseur avec l'étiquette d'ingestion GCP_CLOUD_NAT.

Avant de commencer

• Assurez-vous que tous les systèmes de l'architecture de déploiement sont configurés dans le fuseau horaire UTC.

Configurer Google Cloud pour ingérer les journaux Cloud NAT

Pour en savoir plus sur l'ingestion de journaux dans Google Security Operations, consultez Ingérer des journaux Google Cloud dans Google Security Operations.

Si vous rencontrez des problèmes lors de l'ingestion de journaux Cloud NAT, contactez l'assistance Google Security Operations.

Documentation de référence sur le mappage de champs

Cette section explique comment l'analyseur Google Security Operations mappe les champs Cloud NAT aux champs de modèle de données unifié (UDM) Google Security Operations.

Obsolète:

Les champs labels suivants pour les noms UDM sont obsolètes: about.labels, intermediary.labels, observer.labels, principal.labels, src.labels, security_result.about.labels et target.labels. Pour les analyseurs existants, en plus de ces champs UDM, les champs de journaux sont également mappés avec les champs UDM de clé-valeur additional.fields. Pour les nouveaux analyseurs, les paramètres de clé/valeur des champs UDM additional.fields sont utilisés à la place des champs UDM labels obsolètes. Nous vous recommandons de mettre à jour les règles existantes afin qu'elles utilisent les paramètres de clé-valeur des champs UDM additional.fields plutôt que les champs UDM obsolètes labels.

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]

Étape suivante

• Ingestion de données dans Google Security Operations