aws-assume

Generate temporary credentials for AWS IAM assumed roles.

Very usefull when working with tools like Serverless and Apex for deploying your Lambda code.

The temporary credentials are sent to stdout and can be evaled to use them as environment variables in Bash commands.

Usage

$ aws-assume <profile>

Installation

As part of your Node project

npm install aws-assume --save

Usage as a standalone CLI script

# package.json
...
    "scripts": {
        "deploy": "eval \"`aws-assume` apex deploy\""
    }
...

Usage as a module

import {assumeRole, getProfile, awsConfig} from 'aws-assume'
import AWS from 'aws-sdk'

...
// aws-assume exposes the AWS SDK global configuration object
// so you can customize details such as proxies, loggers and retry options
awsConfig.update({
    httpOptions: { 
        agent: myProxy
    }
});

assumeRole(getProfile())
.then(credentials => {
    AWS.config.credentials = credentials
    // ...
})

Install globally

npm install -g aws-assume
eval "`aws-assume <profile>` npm run deploy"

The AWS profile is selected by the first criteria of these that matches:

1. passing a string after the aws-assume command
2. AWS_PROFILE environment variable
3. default as the default

If you choose to use AWS_PROFILE make sure that you are passing the environment variable to the (sub)shell that calls aws-assume.

For example:

export AWS_PROFILE && eval \"aws-assume apex deploy\"

Requirements

You must have an AWS profile setup in your ~/.aws/credentials file similar to the following:

[default]
aws_access_key_id = ABCDEFG
aws_secret_access_key = abcdefg

You should also have a role based configuration in your ~/.aws/config file:

[profile default]
output = json
region = us-east-1
role_arn = arn:aws:iam::1234567890:role/DesiredRoleName
source_profile = default

Credits

This project is heavely based on aws-auth-helper but without the MFA part and some small variations.

License

The MIT License (MIT)

Copyright (c) 2016 Jonathan Brumley

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.