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# LOM policy evaluations =======================================================
# Controls: LOM-001 through LOM-009
package controls.aws.lom
import data.common.exemptions as exemptions
import data.common.outputs as outputs
# Scope guard ------------------------------------------------------------------
_config_in_scope if {
some _, rc in input.resource_changes
rc.type in {"aws_config_configuration_recorder", "aws_config_delivery_channel"}
}
# LOM-001 — CloudTrail must be multi-region and capture all management events --
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-001"
some _, rc in input.resource_changes
rc.type == "aws_cloudtrail"
rc.change.actions[_] in ["create", "update"]
not _cloudtrail_compliant(rc.change.after)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("CloudTrail trail '%s' is not multi-region or does not capture all management events", [rc.name]),
)
}
_cloudtrail_compliant(after) if {
after.is_multi_region_trail == true
after.include_global_service_events == true
some sel in after.event_selector
sel.read_write_type == "All"
sel.include_management_events == true
}
# LOM-002 — CloudTrail log file integrity validation must be enabled -----------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-002"
some _, rc in input.resource_changes
rc.type == "aws_cloudtrail"
rc.change.actions[_] in ["create", "update"]
rc.change.after.enable_log_file_validation != true
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("CloudTrail trail '%s' does not have log file validation enabled", [rc.name]),
)
}
# LOM-003 — CloudTrail logs must be encrypted with a CMK ----------------------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-003"
some _, rc in input.resource_changes
rc.type == "aws_cloudtrail"
rc.change.actions[_] in ["create", "update"]
not _has_kms_key(rc.change.after.kms_key_id)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("CloudTrail trail '%s' is not encrypted with a KMS CMK", [rc.name]),
)
}
# LOM-004 — CloudWatch Log Groups must be encrypted with a CMK ----------------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-004"
some _, rc in input.resource_changes
rc.type == "aws_cloudwatch_log_group"
rc.change.actions[_] in ["create", "update"]
not _has_kms_key(rc.change.after.kms_key_id)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("CloudWatch Log Group '%s' is not encrypted with a KMS CMK", [rc.name]),
)
}
# LOM-005 — CloudWatch Log Groups must define an explicit retention period -----
# HCA minimum retention: 365 days
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-005"
some _, rc in input.resource_changes
rc.type == "aws_cloudwatch_log_group"
rc.change.actions[_] in ["create", "update"]
not _retention_compliant(rc.change.after.retention_in_days)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("CloudWatch Log Group '%s' does not have a retention period of at least 365 days", [rc.name]),
)
}
_retention_compliant(days) if {
days != null
days >= 365
}
# LOM-006 — VPC Flow Logs must be enabled for every VPC -----------------------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-006"
some _, rc in input.resource_changes
rc.type == "aws_vpc"
rc.change.actions[_] in ["create", "update"]
not _flow_log_exists_by_name(rc.name)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("VPC '%s' has no flow log configured", [rc.name]),
)
}
_flow_log_exists_by_name(vpc_name) if {
some r in _all_configuration_resources
r.type == "aws_flow_log"
some ref in r.expressions.vpc_id.references
ref == concat(".", ["aws_vpc", vpc_name])
}
_all_configuration_resources contains r if {
some r in input.configuration.root_module.resources
}
_all_configuration_resources contains r if {
some _, mc in input.configuration.root_module.module_calls
some r in mc.module.resources
}
# LOM-007 — ALB/NLB must have access logging enabled --------------------------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-007"
some _, rc in input.resource_changes
rc.type == "aws_lb"
rc.change.actions[_] in ["create", "update"]
not _access_logging_enabled(rc.change.after)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("Load balancer '%s' does not have access logging enabled", [rc.name]),
)
}
_access_logging_enabled(after) if {
some log in after.access_logs
log.enabled == true
log.bucket != null
log.bucket != ""
}
# LOM-008 — RDS DB instances must export engine logs to CloudWatch -------------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-008"
some _, rc in input.resource_changes
rc.type == "aws_db_instance"
rc.change.actions[_] in ["create", "update"]
not _has_log_exports(rc.change.after)
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
sprintf("RDS instance '%s' has no CloudWatch log exports configured", [rc.name]),
)
}
_has_log_exports(after) if {
count(after.enabled_cloudwatch_logs_exports) > 0
}
# LOM-009 — AWS Config recorder and delivery channel must be defined ----------
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-009"
_config_in_scope
not _config_recorder_exists
not _config_delivery_channel_exists
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
"No aws_config_configuration_recorder or aws_config_delivery_channel found in plan",
)
}
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-009"
_config_in_scope
_config_recorder_exists
not _config_delivery_channel_exists
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
"aws_config_configuration_recorder exists but aws_config_delivery_channel is missing",
)
}
deny contains msg if {
policy_id := "ICP-TF-AWS-LOM-009"
_config_in_scope
not _config_recorder_exists
_config_delivery_channel_exists
meta := data.policies[policy_id]
meta.status == "active"
not exemptions.policy_exemption(policy_id)
not exemptions.severity_exemption(meta.severity)
msg := outputs.violation(
policy_id, meta,
"aws_config_delivery_channel exists but aws_config_configuration_recorder is missing",
)
}
_config_recorder_exists if {
some _, rc in input.resource_changes
rc.type == "aws_config_configuration_recorder"
rc.change.actions[_] in ["create", "update"]
}
_config_delivery_channel_exists if {
some _, rc in input.resource_changes
rc.type == "aws_config_delivery_channel"
rc.change.actions[_] in ["create", "update"]
}
# Helpers ----------------------------------------------------------------------
_has_kms_key(key) if {
key != null
key != ""
}
|
