STS

STS is a command-line application to obtain temporary credentials via the AWS (Amazon Web Services) Security Token Service.

It's intended to be a drop-in replacement for the functionality provided by the official awscli application: https://aws.amazon.com/cli/ .

Benefits

• Option to drop into a shell with the temporary credentials already set
• Automatically acquire MFA device serial (via IAM request and checking environment variables)
• Option to unset AWS environment variables first, so that subsequent calls for get-session-token etc. don't attempt to use existing temporary credentials
• Native binary available, so simpler installation with no dependencies

Known issues

• STS currently assumes you are using an MFA device, so always requests a token code. If MFA isn't activated, then hit <enter> to bypass 'Enter token value:' prompt.
• assume-role-with-saml not yet implemented
• assume-role-with-web-identity not yet implement
• minimal testing on Windows (support for auto-setting environment variables in Windows 10 introduced in 1.1.2)

Roadmap

• proper documentation
• bash/zsh completion

Installation

Download the latest release for your OS and architecture from: https://github.com/jonhadfield/sts/releases.

For example, on 64-bit Linux:

curl -L "https://github.com/jonhadfield/sts/releases/download/1.1.2/sts_linux_amd64" -o /usr/local/bin/sts ; chmod +x /usr/local/bin/sts

on MacOS:

curl -L "https://github.com/jonhadfield/sts/releases/download/1.1.2/sts_darwin_amd64" -o /usr/local/bin/sts ; chmod +x /usr/local/bin/sts

Example Usage

Note: In order to get temporary credentials, you must first provide your permanent credentials as detailed here.

Obtain temporary credentials for a user:

sts get-session-token --serial-number arn:aws:iam::123456789012:mfa/user --token-code 123456

Obtain temporary credentials for an assumed role:

sts assume-role --role-session-name myrolesession --role-arn arn:aws:iam::123456789012:role/myrole