shoc-backend/infra/cdk/deploy-staging-stack.ts

import * as cdk from 'aws-cdk-lib';
import * as iam from 'aws-cdk-lib/aws-iam';
import { Construct } from 'constructs';

const ACCOUNT_ID = '396287094661';
const REGION = 'us-east-1';
const APPLICATION_NAME = 'shoc-backend';
const ENVIRONMENT_NAME = 'shoc-backend-staging';
const ENVIRONMENT_ID = 'e-6c9m4vb62z';
const ENVIRONMENT_STACK_NAME = `awseb-${ENVIRONMENT_ID}-stack`;
const REPO = 'Sea-Haven-Industries/shoc-backend';
const RUNTIME_ROLE_NAME = 'shoc-backend-staging';
const EXTERNAL_WEBHOOK_SECRET_ARN =
  'arn:aws:secretsmanager:us-east-1:011934824531:secret:workorder-ingest/shoc-webhook-hmac-puYTcB';
const EXTERNAL_WEBHOOK_KEY_ARN =
  'arn:aws:kms:us-east-1:011934824531:key/d10fd1f0-a61a-4405-8568-85e9fd11ba18';

export class DeployStagingStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props: cdk.StackProps = {}) {
    super(scope, id, props);

    const applicationArn = `arn:aws:elasticbeanstalk:${REGION}:${ACCOUNT_ID}:application/${APPLICATION_NAME}`;
    const environmentArn = `arn:aws:elasticbeanstalk:${REGION}:${ACCOUNT_ID}:environment/${APPLICATION_NAME}/${ENVIRONMENT_NAME}`;
    const oidcProviderArn = `arn:aws:iam::${ACCOUNT_ID}:oidc-provider/token.actions.githubusercontent.com`;

    const deployRole = new iam.Role(this, 'GithubDeployRole', {
      roleName: 'githubdeploy-shoc-backend-staging',
      description:
        'Least-privilege GitHub OIDC deploy role for shoc-backend staging. CDK-owned; application/environment/S3 are owned by Elastic Beanstalk.',
      assumedBy: new iam.FederatedPrincipal(
        oidcProviderArn,
        {
          StringEquals: {
            'token.actions.githubusercontent.com:aud': 'sts.amazonaws.com',
            'token.actions.githubusercontent.com:sub': `repo:${REPO}:environment:staging`,
          },
        },
        'sts:AssumeRoleWithWebIdentity',
      ),
    });

    deployRole.applyRemovalPolicy(cdk.RemovalPolicy.RETAIN);
    const cfnRole = deployRole.node.defaultChild as iam.CfnRole;
    cfnRole.cfnOptions.deletionPolicy = cdk.CfnDeletionPolicy.RETAIN;
    cfnRole.cfnOptions.updateReplacePolicy = cdk.CfnDeletionPolicy.RETAIN;

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: [
          'autoscaling:Describe*',
          'ec2:Describe*',
          'elasticbeanstalk:DescribeEnvironments',
          'elasticbeanstalk:DescribeApplicationVersions',
          'elasticbeanstalk:DescribeEvents',
          'elasticloadbalancing:Describe*',
        ],
        resources: ['*'],
      }),
    );

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: ['elasticbeanstalk:CreateApplicationVersion'],
        resources: [
          applicationArn,
          `arn:aws:elasticbeanstalk:${REGION}:${ACCOUNT_ID}:applicationversion/${APPLICATION_NAME}/*`,
        ],
      }),
    );

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: ['elasticbeanstalk:UpdateEnvironment'],
        resources: [environmentArn],
      }),
    );

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: [
          'cloudformation:DescribeStackEvents',
          'cloudformation:DescribeStackResource',
          'cloudformation:GetTemplate',
          'cloudformation:DescribeStackResources',
          'cloudformation:DescribeStacks',
          'cloudformation:ListStackResources',
          'cloudformation:CancelUpdateStack',
          'cloudformation:UpdateStack',
        ],
        resources: [
          `arn:aws:cloudformation:${REGION}:${ACCOUNT_ID}:stack/${ENVIRONMENT_STACK_NAME}/*`,
        ],
      }),
    );

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: [
          'autoscaling:PutNotificationConfiguration',
          'autoscaling:ResumeProcesses',
          'autoscaling:SuspendProcesses',
        ],
        resources: [
          `arn:aws:autoscaling:${REGION}:${ACCOUNT_ID}:autoScalingGroup:*:autoScalingGroupName/${ENVIRONMENT_STACK_NAME}-*`,
        ],
      }),
    );

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: ['s3:Delete*', 's3:Get*', 's3:Put*'],
        // AWS Support case 178526484500047 confirmed that UpdateEnvironment
        // reads, writes, versions, ACL-checks, and removes objects in both the
        // account bucket and AWS-owned Elastic Beanstalk service buckets.
        resources: ['arn:aws:s3:::elasticbeanstalk-*/*'],
      }),
    );

    deployRole.addToPolicy(
      new iam.PolicyStatement({
        effect: iam.Effect.ALLOW,
        actions: [
          's3:GetBucket*',
          's3:ListBucket',
          's3:PutBucketOwnershipControls',
          's3:PutBucketPolicy',
          's3:PutBucketPublicAccessBlock',
        ],
        // This is AWS Support's bucket-level UpdateEnvironment set, excluding
        // CreateBucket because the workflow deploys only to an existing
        // application/environment and disables bucket creation.
        resources: ['arn:aws:s3:::elasticbeanstalk-*'],
      }),
    );

    new cdk.CfnOutput(this, 'GithubDeployRoleArn', {
      value: deployRole.roleArn,
      description: 'ARN of the GitHub OIDC deploy role for shoc-backend staging.',
      exportName: 'shoc-backend-deploy-staging-role-arn',
    });

    // Identity-side grants on the existing Elastic Beanstalk runtime role so
    // the staging application can read the cross-account webhook secret and
    // decrypt it through Secrets Manager only. The secret and KMS key live in
    // the external account 011934824531; their resource policies are owned by
    // that account and are NOT modified or solved by this stack.
    const runtimeRole = iam.Role.fromRoleName(
      this,
      'RuntimeRole',
      RUNTIME_ROLE_NAME,
    );

    new iam.Policy(this, 'RuntimeRoleWebhookSecretPolicy', {
      policyName: 'shoc-backend-staging-webhook-secret-access',
      roles: [runtimeRole],
      statements: [
        new iam.PolicyStatement({
          effect: iam.Effect.ALLOW,
          actions: [
            'secretsmanager:GetSecretValue',
            'secretsmanager:DescribeSecret',
          ],
          resources: [EXTERNAL_WEBHOOK_SECRET_ARN],
        }),
        new iam.PolicyStatement({
          effect: iam.Effect.ALLOW,
          actions: ['kms:Decrypt'],
          resources: [EXTERNAL_WEBHOOK_KEY_ARN],
          conditions: {
            StringEquals: {
              'kms:ViaService': 'secretsmanager.us-east-1.amazonaws.com',
            },
          },
        }),
      ],
    });
  }
}