mirror of
https://github.com/Sea-Haven-Industries/seahaven-org-baseline.git
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3ba90ddc40
- H-1: 15 CIS Section 4 metric filters (4.1-4.15) on the CloudTrail log group, each alarming to a new SSE SNS topic seahaven-cis-alarms (email to adam). ALARM-only actions per Sea Haven preference. 4.16 = Security Hub (Day 1). - H-14: VPC flow logs (ALL traffic) on all 5 VPCs → hardened S3 bucket. Delivery bucket policy cross-reviewed; kept the AWS-required s3:x-amz-acl condition + logs:*:* source-ARN (cross-reviewer wrongly flagged these; verified against AWS flow-logs-s3-permissions docs), dropped the unneeded s3:ListBucket. - M-13: SES configuration set seahaven-email-events capturing bounce/complaint/ reject to CloudWatch for reputation visibility. L-4 (log retention) and L-5 (alarm action) applied via CLI, documented in README.
108 lines
3.7 KiB
TypeScript
108 lines
3.7 KiB
TypeScript
import * as cdk from "aws-cdk-lib";
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import * as s3 from "aws-cdk-lib/aws-s3";
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import * as iam from "aws-cdk-lib/aws-iam";
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import * as ec2 from "aws-cdk-lib/aws-ec2";
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import { Construct } from "constructs";
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/**
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* VPC flow logs for every VPC, delivered to a hardened S3 bucket (audit H-14,
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* CIS 3.9/5.6). S3 destination (not CloudWatch Logs) for cost — query
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* forensically via Athena. ALL traffic (accept + reject).
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*
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* S3 delivery needs no IAM role; instead the bucket policy grants the
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* `delivery.logs.amazonaws.com` service principal write access, scoped to this
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* account. That bucket policy is the Day 2 cross-review item.
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*/
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// All 5 VPCs in 328440206208 / us-east-1 (4 custom + default), audit Agent 7.
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const VPC_IDS = [
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"vpc-061d66990b6a4d1fb",
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"vpc-0542a9e934b417d23",
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"vpc-062d200c68bd4ca0e",
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"vpc-0d3d4b67bd0cf8a68",
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"vpc-02c10a89d66f6f9b8",
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];
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export class FlowLogs extends Construct {
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constructor(scope: Construct, id: string) {
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super(scope, id);
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const stack = cdk.Stack.of(this);
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const bucket = new s3.Bucket(this, "FlowLogsBucket", {
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bucketName: `seahaven-vpc-flow-logs-${stack.account}`,
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encryption: s3.BucketEncryption.S3_MANAGED,
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blockPublicAccess: s3.BlockPublicAccess.BLOCK_ALL,
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enforceSSL: true,
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versioned: false,
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lifecycleRules: [
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{
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id: "transition-and-expire",
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transitions: [
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{
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storageClass: s3.StorageClass.GLACIER,
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transitionAfter: cdk.Duration.days(90),
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},
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],
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expiration: cdk.Duration.days(365),
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abortIncompleteMultipartUploadAfter: cdk.Duration.days(7),
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},
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],
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removalPolicy: cdk.RemovalPolicy.RETAIN,
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});
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// Log-delivery service permissions (scoped to this account) — the standard
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// VPC-flow-logs-to-S3 bucket policy.
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bucket.addToResourcePolicy(
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new iam.PolicyStatement({
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sid: "AWSLogDeliveryWrite",
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effect: iam.Effect.ALLOW,
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principals: [new iam.ServicePrincipal("delivery.logs.amazonaws.com")],
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actions: ["s3:PutObject"],
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resources: [bucket.arnForObjects(`AWSLogs/${stack.account}/*`)],
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conditions: {
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StringEquals: {
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"s3:x-amz-acl": "bucket-owner-full-control",
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"aws:SourceAccount": stack.account,
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},
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ArnLike: {
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"aws:SourceArn": `arn:${stack.partition}:logs:${stack.region}:${stack.account}:*`,
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},
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},
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})
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);
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bucket.addToResourcePolicy(
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new iam.PolicyStatement({
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sid: "AWSLogDeliveryAclCheck",
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effect: iam.Effect.ALLOW,
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principals: [new iam.ServicePrincipal("delivery.logs.amazonaws.com")],
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// AWS's documented flow-logs-to-S3 policy uses GetBucketAcl only
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// (verified against flow-logs-s3-permissions.html); ListBucket is not
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// needed and would be over-permissioned.
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actions: ["s3:GetBucketAcl"],
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resources: [bucket.bucketArn],
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conditions: {
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StringEquals: { "aws:SourceAccount": stack.account },
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ArnLike: {
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"aws:SourceArn": `arn:${stack.partition}:logs:${stack.region}:${stack.account}:*`,
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},
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},
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})
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);
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VPC_IDS.forEach((vpcId, i) => {
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const flowLog = new ec2.CfnFlowLog(this, `FlowLog${i}`, {
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resourceId: vpcId,
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resourceType: "VPC",
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trafficType: "ALL",
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logDestinationType: "s3",
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logDestination: bucket.bucketArn,
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maxAggregationInterval: 600,
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tags: [{ key: "Name", value: `flow-log-${vpcId}` }],
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});
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flowLog.node.addDependency(bucket.policy!);
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});
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new cdk.CfnOutput(this, "FlowLogsBucketName", { value: bucket.bucketName });
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}
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}
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