README.md

aws-lambda-secretsmanager module

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All classes are under active development and subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

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Reference Documentation:	https://docs.aws.amazon.com/solutions/latest/constructs/

Language	Package
Python	aws_solutions_constructs.aws_lambda_secretsmanager
Typescript	@aws-solutions-constructs/aws-lambda-secretsmanager
Java	software.amazon.awsconstructs.services.lambdasecretsmanager

This AWS Solutions Construct implements the AWS Lambda function and AWS Secrets Manager secret with the least privileged permissions.

Here is a minimal deployable pattern definition in Typescript:

const { LambdaToSecretsmanagerProps,  LambdaToSecretsmanager } from '@aws-solutions-constructs/aws-lambda-secretsmanager';

const props: LambdaToSecretsmanagerProps = {
    lambdaFunctionProps: {
      runtime: lambda.Runtime.NODEJS_14_X,
      // This assumes a handler function in lib/lambda/index.js
      code: lambda.Code.fromAsset(`${__dirname}/lambda`),
      handler: 'index.handler'
    },
};

new LambdaToSecretsmanager(this, 'test-lambda-secretsmanager-stack', props);

Initializer

new LambdaToSecretsmanager(scope: Construct, id: string, props: LambdaToSecretsmanagerProps);

Parameters

• scope Construct
• id string
• props LambdaToSecretsmanagerProps

Pattern Construct Props

Name	Type	Description
existingLambdaObj?	lambda.Function	Existing instance of Lambda Function object, if this is set then the lambdaFunctionProps is ignored.
lambdaFunctionProps?	lambda.FunctionProps	User provided props to override the default props for the Lambda function.
secretProps?	secretsmanager.SecretProps	Optional user provided props to override the default props for Secrets Manager
existingSecretObj?	secretsmanager.Secret	Existing instance of Secrets Manager Secret object, If this is set then the secretProps is ignored
grantWriteAccess?	boolean	Optional write access to the Secret for the Lambda function (Read-Only by default)
secretEnvironmentVariableName?	string	Optional Name for the Secrets Manager secret environment variable set for the Lambda function.
existingVpc?	ec2.IVpc	An optional, existing VPC into which this pattern should be deployed. When deployed in a VPC, the Lambda function will use ENIs in the VPC to access network resources and an Interface Endpoint will be created in the VPC for AWS Secrets Manager. If an existing VPC is provided, the deployVpc property cannot be true. This uses ec2.IVpc to allow clients to supply VPCs that exist outside the stack using the ec2.Vpc.fromLookup() method.
vpcProps?	ec2.VpcProps	Optional user-provided properties to override the default properties for the new VPC. enableDnsHostnames, enableDnsSupport, natGateways and subnetConfiguration are set by the pattern, so any values for those properties supplied here will be overrriden. If deployVpc is not true then this property will be ignored.
deployVpc?	boolean	Whether to create a new VPC based on vpcProps into which to deploy this pattern. Setting this to true will deploy the minimal, most private VPC to run the pattern: One isolated subnet in each Availability Zone used by the CDK program enableDnsHostnames and enableDnsSupport will both be set to true If this property is true then existingVpc cannot be specified. Defaults to false.

Pattern Properties

Name	Type	Description
lambdaFunction	lambda.Function	Returns an instance of lambda.Function created by the construct
secret	secretsmanager.Secret	Returns an instance of secretsmanager.Secret created by the construct
vpc?	ec2.IVpc	Returns an interface on the VPC used by the pattern (if any). This may be a VPC created by the pattern or the VPC supplied to the pattern constructor.

Default settings

Out of the box implementation of the Construct without any override will set the following defaults:

AWS Lambda Function

• Configure limited privilege access IAM role for Lambda function
• Enable reusing connections with Keep-Alive for NodeJs Lambda function
• Enable X-Ray Tracing
• Set Environment Variables
  • (default) SECRET_ARN containing the ARN of the secret as return by CDK secretArn property.
  • AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)

Amazon SecretsManager Secret

• Enable read-only access for the associated AWS Lambda Function
• Enable server-side encryption using a default KMS key for the account and region
• Creates a new Secret
  • (default) random name
  • (default) random value
• Retain the Secret when deleting the CloudFormation stack

Architecture

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