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* Add AWS Backup with offsite vault (audit C-7)
The account had zero AWS Backup vaults/plans, so 22 of 23 data stores
had no immutable, cross-region recovery path (audit finding C-7). One
ransomware event or rogue delete would erase primary plus same-region
snapshots/PITR.
Phase 1 ("critical data first") protects the seven highest-risk stores
with no offsite leg today (2 RDS, 2 DynamoDB, 3 S3) via a daily plan in
a new us-east-1 vault, copied cross-region into a governance-locked
us-west-2 vault. Governance (not compliance) mode first so the plan can
be validated before committing to irreversible immutability.
The backup service role is backup-only (no restore policies) to stay
least-privilege; restores get a separate audited path later. Resources
are selected by explicit ARN to avoid drifting the stacks that own them.
Deploys via the shared cdk deploy --all alongside the C-1 CloudTrail
stack. See the README pre-deploy gates (S3 versioning, database-1
unencrypted copy smoke-test, DynamoDB PITR) before the first run.
* Grant AWS Backup service use of vault CMKs
The L2 BackupVault does not grant the backup service principal use of a
customer-managed key; the synthesized key policy only delegated to
account IAM. Cross-region copy of encrypted RDS/EBS recovery points uses
KMS grants on the destination key, so without an explicit grant those
copy jobs fail — and silently, since the account has no CloudTrail yet.
Add backup.amazonaws.com crypto + CreateGrant statements to both vault
keys, scoped by aws:SourceAccount (cross-review BLOCK 2; mirrors the
discipline used on the C-1 CloudTrail key). Same class of bug the C-1
cross-review caught on the CloudTrail CMK.
87 lines
3.6 KiB
TypeScript
87 lines
3.6 KiB
TypeScript
import * as cdk from "aws-cdk-lib";
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import * as kms from "aws-cdk-lib/aws-kms";
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import * as iam from "aws-cdk-lib/aws-iam";
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import * as backup from "aws-cdk-lib/aws-backup";
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import { Construct } from "constructs";
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/**
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* Offsite AWS Backup vault for Sea Haven (account 328440206208), in us-west-2.
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*
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* This is the Copy3 / offsite leg of the 3-2-1 strategy and the only immutable
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* recovery path in the account. The primary plan (see backup-stack.ts, us-east-1)
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* copies recovery points here cross-region. Closes audit finding C-7 together
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* with backup-stack.
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*
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* Vault Lock is GOVERNANCE mode for now (minRetention only, no `changeableFor`):
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* recovery points cannot be silently deleted, but a principal with explicit
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* `backup:DeleteRecoveryPoint` / `backup:DeleteBackupVaultLockConfiguration`
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* permission can still intervene while we validate the plan. Graduate to
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* COMPLIANCE mode later by adding `changeableFor` (irreversible after the
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* cooling-off window) — a one-line change + redeploy.
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*/
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export class BackupOffsiteStack extends cdk.Stack {
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constructor(scope: Construct, id: string, props?: cdk.StackProps) {
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super(scope, id, props);
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// CMK encrypting offsite recovery points (rotation on; RETAIN so a stack
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// teardown never strands/destroys the only immutable copy).
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const vaultKey = new kms.Key(this, "OffsiteVaultKey", {
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alias: "backup-offsite-vault",
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description: "Encrypts offsite AWS Backup recovery points (us-west-2)",
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enableKeyRotation: true,
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removalPolicy: cdk.RemovalPolicy.RETAIN,
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});
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// The L2 BackupVault does NOT grant the backup service use of a customer
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// CMK — without this, cross-region COPY jobs of encrypted RDS/EBS recovery
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// points fail (and silently, with no CloudTrail). Grant backup.amazonaws.com
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// the minimum KMS actions on this destination key, incl. CreateGrant.
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vaultKey.addToResourcePolicy(
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new iam.PolicyStatement({
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sid: "AllowAwsBackupUseOfTheKey",
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principals: [new iam.ServicePrincipal("backup.amazonaws.com")],
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// Action set matches AWS's documented Backup vault-key policy; scoped
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// to this account so only this account's Backup service can use it.
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actions: [
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"kms:Decrypt",
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"kms:GenerateDataKey",
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"kms:GenerateDataKeyWithoutPlaintext",
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"kms:ReEncrypt*",
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"kms:DescribeKey",
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],
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resources: ["*"],
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conditions: { StringEquals: { "aws:SourceAccount": this.account } },
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})
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);
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vaultKey.addToResourcePolicy(
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new iam.PolicyStatement({
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sid: "AllowAwsBackupCreateGrant",
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principals: [new iam.ServicePrincipal("backup.amazonaws.com")],
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actions: ["kms:CreateGrant"],
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resources: ["*"],
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conditions: {
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Bool: { "kms:GrantIsForAWSResource": "true" },
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StringEquals: { "aws:SourceAccount": this.account },
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},
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})
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);
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new backup.BackupVault(this, "OffsiteVault", {
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backupVaultName: "seahaven-offsite",
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encryptionKey: vaultKey,
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removalPolicy: cdk.RemovalPolicy.RETAIN,
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// Governance-mode Vault Lock: no `changeableFor`, so it stays adjustable.
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lockConfiguration: {
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minRetention: cdk.Duration.days(30),
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},
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});
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cdk.Tags.of(this).add("Project", "account-baseline");
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cdk.Tags.of(this).add("Owner", "adam@seahavenind.com");
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cdk.Tags.of(this).add("Environment", "prod");
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cdk.Tags.of(this).add("ManagedBy", "cdk");
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new cdk.CfnOutput(this, "OffsiteVaultName", { value: "seahaven-offsite" });
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new cdk.CfnOutput(this, "OffsiteVaultKmsKeyArn", { value: vaultKey.keyArn });
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}
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}
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