feat(single-vm/aws): add VPC Flow Logs to close SECURITY-DEFAULTS gap#9
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dmchaledev wants to merge 1 commit into
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feat(single-vm/aws): add VPC Flow Logs to close SECURITY-DEFAULTS gap#9dmchaledev wants to merge 1 commit into
dmchaledev wants to merge 1 commit into
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SECURITY-DEFAULTS.md has long claimed VPC Flow Logs are enabled by default, but the single-vm/aws core module had no flow-log resources. This gap meant customers relying on the documented default had no flow logs at all. Adds the same pattern already present in unlimited-scale/aws: - aws_cloudwatch_log_group (30-day retention, optional CMK) - aws_iam_role + aws_iam_role_policy scoped to that log group - aws_flow_log targeting the caller-provided vpc_id Variable enable_flow_logs defaults to true (matching SECURITY-DEFAULTS.md). Wrappers asm-aws-single and sat-aws-single are updated to forward the variable and re-export the new flow_log_group_name output so the wrapper-forwarding CI gate passes. ha-hot-hot/aws has the same gap and is tracked separately. https://claude.ai/code/session_01B6D637ANdrxC826zTQmSYi
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Problem
SECURITY-DEFAULTS.mdhas always stated:But
modules/single-vm/awshad zero flow-log resources — noaws_flow_log, no CloudWatch log group, no IAM role. Customers reading the security documentation and deploying the single-vm tier had no flow logs at all, creating a silent compliance and forensics gap.unlimited-scale/awsalready ships the correct implementation. This PR ports that pattern tosingle-vm/awsand updates both product wrappers to keep thewrapper-forwardingCI gate green.Changes
modules/single-vm/aws/variables.tfenable_flow_logs(bool, defaulttrue)modules/single-vm/aws/main.tfaws_cloudwatch_log_group,aws_iam_role,aws_iam_role_policy,aws_flow_log— identical pattern tounlimited-scale/awsmodules/single-vm/aws/outputs.tfflow_log_group_nameoutputmodules/asm-aws-single/{variables,main,outputs}.tfenable_flow_logs, re-exportflow_log_group_namemodules/sat-aws-single/{variables,main,outputs}.tfNo new Checkov suppressions needed —
CKV_AWS_338(CW log retention < 1 year) andCKV_AWS_158(CW log group KMS when CMK is off) are already suppressed with documented rationale, and the#tfsec:ignore:aws-iam-no-policy-wildcardsinline annotation handles thelogs:DescribeLogGroups Resource = "*"requirement exactly as inunlimited-scale/aws.What this does NOT change
ha-hot-hot/awshas the same gap. That's a larger module with its own VPC and more surface area — tracked separately so this small, self-contained fix can ship now.single-vm/azureNSG flow log parity is a follow-on.enable_flow_logs = true(the new default) on a VPC that already has a flow log is additive — AWS supports multiple flow log configurations per VPC. Operators who want to opt out can setenable_flow_logs = false.Test plan
terraform validatepasses onmodules/single-vm/aws,asm-aws-single,sat-aws-singlewrapper-forwardingcheck passes (new variable is forwarded by both wrappers)tflintpassescheckovpasses (no new suppressions added)flow_log_group_nameoutput is non-empty afterterraform applyon a test VPChttps://claude.ai/code/session_01B6D637ANdrxC826zTQmSYi
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