lambda-secrets

secret solution for lambda functions using KMS

Installing

npm install --save lambda-secrets

Getting Started

Prereqs:

1. encrypt sensitive data using a KMS key
2. grant the lambda function's role access to decrypt using the KMS key
3. assign ciphertext as lambda function environment variables

import AWS from 'aws-sdk';
import Secrets from 'lambda-secrets';

// configure a kms client
const kms = new AWS.KMS();

// instantiate a new secret provider, passing in the configured kms client
const secrets = new Secrets(kms);

// add secrets to the provider
secrets.addSecret('api', process.env.SECRET_API);
secrets.addSecret('password', process.env.SECRET_PASSWORD);

export async function handler(e, ctx, done) {
  try {
    // initializ the secrets provider. note: this will only decrypt the secrets
    // on the first call. on subsequent executions, this is essentially a noop.
    await secrets.initialize();
    console.log(secrets.get('api'));
    console.log(secrets.get('password'));
    done();
  } catch(err) {
    console.error(err);
    done(err);
  }
}

API

Secrets(kms) -> secrets

instantiate a new secret provider instance

Arguments

| Name | Type | Description | | --- | --- | --- | | kms | Object | a configured KMS instance |

Example

import AWS from 'aws-sdk';
import Secrets from 'lambda-secrets';

// configure a kms client
const kms = new AWS.KMS();

// instantiate a new secret provider, passing in the configured kms client
const secrets = new Secrets(kms);

addSecret(name, ciphertext, [parse]) -> secrets

define a new secret configuration

Arguments

| Name | Type | Description | | --- | --- | --- | | name | String | the name at which the decrypted/parsed secret will be available | | ciphertext | String | the encrypted ciphertext from KMS | | [parse] | Function | an optional function used to parse the decrypted plaintext |

Example

secrets.addSecret('password', process.env.PASSWORD);
secrets.addSecret('port', process.env.PORT, x => parseInt(x));
secrets.addSecret('db', process.env.DB, x => JSON.parse(x));

get(path, defaultVal) -> *

instantiate a new secret provider instance

Arguments

| Name | Type | Description | | --- | --- | --- | | path | String or String[] | the name at which the decrypted/parsed secret will be available | | defaultVal | * | an optional default value to return if no result found at path |

Example

secrets.get('password');
secrets.get('port');
secrets.get('db.host');
secrets.get('db.port', 5432);

Testing

run the test suite

$ npm test

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

License

Copyright (c) 2017 Chris Ludden.
Licensed under the MIT License