Initial account-baseline stack with CloudTrail (audit C-1)

Multi-region CloudTrail with log-file validation, a rotating KMS CMK, an Object-Lock'd S3 log bucket, and CloudWatch Logs delivery. First resident of the account-level security baseline; AWS Backup / 3-2-1 (C-7) lands alongside. IAM/KMS/S3 policies cross-reviewed; review caught a missing CloudTrail KMS grant, now added (SourceArn + encryption-context scoped).
2026-09-30 03:23:15 +00:00 · 2026-05-29 17:44:55 -04:00 · 2026-05-29 17:44:55 -04:00 · dc079edb93
commit dc079edb93
11 changed files with 1060 additions and 0 deletions
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@ -0,0 +1,18 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      minor-and-patch:
+        update-types:
+          - "minor"
+          - "patch"
+    ignore:
+      # aws-cdk-lib is pinned exactly (bundled transitive deps); bump deliberately.
+      - dependency-name: "aws-cdk-lib"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@ -0,0 +1,10 @@
+name: CI
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    uses: Sea-Haven-Industries/.github/.github/workflows/ci-typescript-cdk.yaml@main
+    with:
+      node-version: "24"
--- a/.github/workflows/deploy.yaml
+++ b/.github/workflows/deploy.yaml
@ -0,0 +1,20 @@
+name: Deploy
+on:
+  push:
+    branches: [main]
+
+permissions:
+  id-token: write
+  contents: read
+
+concurrency:
+  group: deploy
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    uses: Sea-Haven-Industries/.github/.github/workflows/cd-cdk.yaml@main
+    with:
+      node-version: "24"
+    secrets:
+      deploy-role-arn: ${{ secrets.AWS_DEPLOY_ROLE_ARN }}
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,6 @@
+node_modules/
+cdk.out/
+*.js
+*.d.ts
+*.js.map
+.env
--- a/README.md
+++ b/README.md
@ -0,0 +1,61 @@
+# seahaven-account-baseline
+
+Account-level security and governance baseline for Sea Haven Industries
+(AWS account **328440206208**, region **us-east-1**), managed as a single CDK
+TypeScript app. This is where account-wide detective controls live, so they are
+versioned, reviewed, and drift-checked like any other stack.
+
+## What it deploys
+
+### CloudTrail (audit finding C-1)
+
+| Resource | Logical ID | Notes |
+|---|---|---|
+| Multi-region trail | `Trail` (`seahaven-org-trail`) | Management events read+write, global service events, **log-file validation on** |
+| Log bucket | `TrailLogBucket` (`seahaven-cloudtrail-logs-328440206208`) | Private (Block Public Access all), SSE-KMS, versioned, **TLS-only**, **Object Lock GOVERNANCE 365d**, lifecycle (Glacier @90d, expire @365d), server access logging → `seahaven-s3-access-logs` |
+| KMS CMK | `TrailKey` (`alias/cloudtrail-logs`) | Encrypts log files; **automatic rotation enabled** |
+| CloudWatch Logs group | created by the L2 `Trail` | 365-day retention; this is the group the CIS Section 4 metric filters (H-1) attach to |
+
+**Data flow:** API activity across all regions → CloudTrail → (a) KMS-encrypted,
+Object-Locked S3 bucket for durable/tamper-resistant storage and (b) CloudWatch
+Logs for real-time querying and metric-filter alarms.
+
+**Compliance impact:** closes CIS 3.1 (multi-region trail), 3.2 (log-file
+validation), 3.4 (CloudWatch Logs integration), 3.6 (bucket access logging),
+3.7 (KMS CMK encryption), and 3.8 (CMK rotation). Unblocks CIS Section 4 /
+finding H-1 (metric filters + alarms now have a log group to target).
+
+### Design decisions
+
+- **Management events only.** Object-level S3/Lambda data events (CIS 3.10/3.11)
+  are deferred to control cost; revisit with targeted S3 *write* data events on
+  sensitive buckets (payments / accounting / kb) if needed.
+- **Object Lock GOVERNANCE, not COMPLIANCE.** Tamper-resistant but still
+  deletable by a principal holding `s3:BypassGovernanceRetention` — avoids the
+  irreversibility of COMPLIANCE mode. Revisit if a stricter posture is required.
+- **RETAIN** on the bucket and KMS key so a stack teardown never destroys the
+  audit trail.
+
+## Roadmap (same stack)
+
+Account-level detective controls with no current home, to be added here:
+AWS Config (H-2), GuardDuty (H-3), Security Hub (H-4), IAM Access Analyzer
+(M-5), Inspector2 (M-6).
+
+## Deploy
+
+CI/CD via the org reusable workflows (`ci-typescript-cdk.yaml`,
+`cd-cdk.yaml`); pushes to `main` deploy through the OIDC role in
+`secrets.AWS_DEPLOY_ROLE_ARN`. Local: `npm ci && npm run build && npx cdk diff`.
+
+```
+npx cdk deploy seahaven-account-baseline
+```
+
+## Verify
+
+```
+aws cloudtrail get-trail-status --name seahaven-org-trail        # IsLogging: true
+aws cloudtrail describe-trails --trail-name-list seahaven-org-trail
+aws cloudtrail validate-logs --trail-arn <arn> --start-time <t>  # digest integrity
+```
--- a/bin/app.ts
+++ b/bin/app.ts
@ -0,0 +1,11 @@
+#!/usr/bin/env node
+import "source-map-support/register";
+import * as cdk from "aws-cdk-lib";
+import { AccountBaselineStack } from "../lib/account-baseline-stack";
+
+const app = new cdk.App();
+
+new AccountBaselineStack(app, "account-baseline", {
+  stackName: "seahaven-account-baseline",
+  env: { account: "328440206208", region: "us-east-1" },
+});
--- a/cdk.json
+++ b/cdk.json
@ -0,0 +1,22 @@
+{
+  "app": "npx ts-node bin/app.ts",
+  "watch": {
+    "include": ["**"],
+    "exclude": [
+      "README.md",
+      "cdk*.json",
+      "**/*.d.ts",
+      "**/*.js",
+      "tsconfig.json",
+      "package*.json",
+      "node_modules",
+      "test",
+      "cdk.out"
+    ]
+  },
+  "context": {
+    "@aws-cdk/aws-lambda:recognizeLayerVersion": true,
+    "@aws-cdk/core:checkSecretUsage": true,
+    "@aws-cdk/core:target-partitions": ["aws"]
+  }
+}
--- a/lib/account-baseline-stack.ts
+++ b/lib/account-baseline-stack.ts
@ -0,0 +1,137 @@
+import * as cdk from "aws-cdk-lib";
+import * as s3 from "aws-cdk-lib/aws-s3";
+import * as kms from "aws-cdk-lib/aws-kms";
+import * as iam from "aws-cdk-lib/aws-iam";
+import * as logs from "aws-cdk-lib/aws-logs";
+import * as cloudtrail from "aws-cdk-lib/aws-cloudtrail";
+import { Construct } from "constructs";
+
+/**
+ * Account-level security baseline for Sea Haven (account 328440206208).
+ *
+ * First resident: a multi-region CloudTrail with log-file validation, KMS
+ * encryption, an Object-Lock'd S3 log bucket, and CloudWatch Logs delivery.
+ * Closes audit finding C-1 and CIS 3.1/3.2/3.4/3.6/3.7 (+3.8 via key rotation),
+ * and provides the CloudWatch Logs group that the CIS Section 4 metric filters
+ * (H-1) attach to.
+ *
+ * Future residents (same stack): AWS Config (H-2), GuardDuty (H-3),
+ * Security Hub (H-4), IAM Access Analyzer (M-5), Inspector2 (M-6).
+ */
+export class AccountBaselineStack extends cdk.Stack {
+  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
+    super(scope, id, props);
+
+    const trailName = "seahaven-org-trail";
+    // Static trail ARN (built from name, not trail.trailArn) so the key policy
+    // does not create a circular dependency with the Trail resource.
+    const trailArn = cdk.Arn.format(
+      { service: "cloudtrail", resource: "trail", resourceName: trailName },
+      this
+    );
+
+    // ── KMS CMK ── encrypts CloudTrail log files (CIS 3.7); rotation = CIS 3.8.
+    const trailKey = new kms.Key(this, "TrailKey", {
+      alias: "cloudtrail-logs",
+      description: "Encrypts CloudTrail log files for the account-wide trail",
+      enableKeyRotation: true,
+      removalPolicy: cdk.RemovalPolicy.RETAIN,
+    });
+
+    // The L2 Trail construct does NOT grant the CloudTrail service principal use
+    // of a customer-provided key, so delivery of encrypted logs would fail.
+    // Grant it explicitly, scoped to this account's trail via SourceArn and the
+    // CloudTrail encryption context. (Caught by cross-review 2026-05-29.)
+    trailKey.addToResourcePolicy(
+      new iam.PolicyStatement({
+        sid: "AllowCloudTrailEncrypt",
+        effect: iam.Effect.ALLOW,
+        principals: [new iam.ServicePrincipal("cloudtrail.amazonaws.com")],
+        actions: ["kms:GenerateDataKey*"],
+        resources: ["*"],
+        conditions: {
+          StringEquals: { "aws:SourceArn": trailArn },
+          StringLike: {
+            "kms:EncryptionContext:aws:cloudtrail:arn": `arn:${this.partition}:cloudtrail:*:${this.account}:trail/*`,
+          },
+        },
+      })
+    );
+    trailKey.addToResourcePolicy(
+      new iam.PolicyStatement({
+        sid: "AllowCloudTrailDescribeKey",
+        effect: iam.Effect.ALLOW,
+        principals: [new iam.ServicePrincipal("cloudtrail.amazonaws.com")],
+        actions: ["kms:DescribeKey"],
+        resources: ["*"],
+      })
+    );
+
+    // Central, pre-existing access-logs bucket (manually created, imported
+    // read-only) — receives S3 server access logs for the trail bucket (CIS 3.6).
+    const accessLogsBucket = s3.Bucket.fromBucketName(
+      this,
+      "AccessLogsBucket",
+      "seahaven-s3-access-logs"
+    );
+
+    // ── Hardened, tamper-resistant log bucket ──
+    // Private (BPA all on), KMS-encrypted, versioned, TLS-only, Object-Lock
+    // GOVERNANCE 365d so logs cannot be silently deleted/overwritten.
+    const logBucket = new s3.Bucket(this, "TrailLogBucket", {
+      bucketName: `seahaven-cloudtrail-logs-${this.account}`,
+      encryption: s3.BucketEncryption.KMS,
+      encryptionKey: trailKey,
+      bucketKeyEnabled: true,
+      blockPublicAccess: s3.BlockPublicAccess.BLOCK_ALL,
+      enforceSSL: true,
+      versioned: true,
+      objectLockEnabled: true,
+      objectLockDefaultRetention: s3.ObjectLockRetention.governance(
+        cdk.Duration.days(365)
+      ),
+      serverAccessLogsBucket: accessLogsBucket,
+      serverAccessLogsPrefix: "cloudtrail-bucket-access/",
+      lifecycleRules: [
+        {
+          id: "transition-and-expire",
+          transitions: [
+            {
+              storageClass: s3.StorageClass.GLACIER,
+              transitionAfter: cdk.Duration.days(90),
+            },
+          ],
+          expiration: cdk.Duration.days(365),
+          abortIncompleteMultipartUploadAfter: cdk.Duration.days(7),
+        },
+      ],
+      removalPolicy: cdk.RemovalPolicy.RETAIN,
+    });
+
+    // ── Multi-region trail ──
+    // Management events (read + write), log-file validation, global service
+    // events, delivered to the KMS-encrypted bucket and to CloudWatch Logs.
+    // Data events (CIS 3.10/3.11) intentionally deferred — management events
+    // only for now to control cost (see README).
+    const trail = new cloudtrail.Trail(this, "Trail", {
+      trailName,
+      bucket: logBucket,
+      encryptionKey: trailKey,
+      isMultiRegionTrail: true,
+      includeGlobalServiceEvents: true,
+      enableFileValidation: true,
+      sendToCloudWatchLogs: true,
+      cloudWatchLogsRetention: logs.RetentionDays.ONE_YEAR,
+      managementEvents: cloudtrail.ReadWriteType.ALL,
+    });
+
+    cdk.Tags.of(this).add("Project", "account-baseline");
+    cdk.Tags.of(this).add("Owner", "adam@seahavenind.com");
+    cdk.Tags.of(this).add("Environment", "prod");
+    cdk.Tags.of(this).add("ManagedBy", "cdk");
+
+    new cdk.CfnOutput(this, "TrailArn", { value: trail.trailArn });
+    new cdk.CfnOutput(this, "LogBucketName", { value: logBucket.bucketName });
+    new cdk.CfnOutput(this, "TrailKmsKeyArn", { value: trailKey.keyArn });
+  }
+}
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,724 @@
+{
+  "name": "seahaven-account-baseline",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "seahaven-account-baseline",
+      "version": "1.0.0",
+      "dependencies": {
+        "aws-cdk-lib": "2.253.1",
+        "constructs": "^10.0.0"
+      },
+      "bin": {
+        "app": "bin/app.js"
+      },
+      "devDependencies": {
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+        "@types/source-map-support": "^0.5.10",
+        "aws-cdk": "^2.252.0",
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+        "ts-node": "^10.9.2",
+        "typescript": "~5.7.0"
+      }
+    },
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+}
--- a/package.json
+++ b/package.json
@ -0,0 +1,26 @@
+{
+  "name": "seahaven-account-baseline",
+  "version": "1.0.0",
+  "bin": {
+    "app": "bin/app.js"
+  },
+  "scripts": {
+    "build": "tsc",
+    "cdk": "cdk",
+    "synth": "cdk synth",
+    "deploy": "cdk deploy",
+    "diff": "cdk diff"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "@types/source-map-support": "^0.5.10",
+    "aws-cdk": "^2.252.0",
+    "source-map-support": "^0.5.21",
+    "ts-node": "^10.9.2",
+    "typescript": "~5.7.0"
+  },
+  "dependencies": {
+    "aws-cdk-lib": "2.253.1",
+    "constructs": "^10.0.0"
+  }
+}
--- a/tsconfig.json
+++ b/tsconfig.json
@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "commonjs",
+    "lib": ["ES2022"],
+    "types": ["node"],
+    "declaration": true,
+    "strict": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "inlineSourceMap": true,
+    "inlineSources": true,
+    "experimentalDecorators": true,
+    "strictPropertyInitialization": false,
+    "outDir": "./cdk.out",
+    "rootDir": ".",
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "esModuleInterop": true
+  },
+  "exclude": ["node_modules", "cdk.out"]
+}