Shell function for assuming roles in to AWS

Based on https://github.com/coinbase/assume-role with a few modifications:

• Reads GPG encrypted base credentials
• Base credentials do not need GetUser permissions
• ZSH auto completion
• Bash auto completion
• List of roles in accounts file for role auto completion
• Validates assumed role against sts:get-caller-identity

Assuming account1 is the account alias in ~/.aws/accounts and root is the role to be assumed.

aws-assume-role account1 root

AWS_ASSUME_ROLE_CACHE_TO_FILE

If set to true, the master session credentials will be written to file and will be reused for multiple terminal sessions.

1. jq - brew install jq
2. AWS CLI

cat <<CREDS | gpg -e -r GPG_KEY_ID > ~/.aws/credentials.gpg
export AWS_ACCESS_KEY_ID=.....
export AWS_SECRET_ACCESS_KEY=.....
CREDS

echo arn:aws:iam::ACCOUNT_ID:mfa/USERNAME > ~/.aws/mfadevice

Add . REPO_LOCATION/aws-assume-role

Create an accounts file at ~/.aws/accounts

{
    "account1": {
        "id": "1234567890",
        "roles": [
            "admin",
            "ro"
        ],
        "region": "us-west-2"
    },
    "account2": {
        "id": "2234567890",
        "roles": [
            "admin",
            "ro"
        ],
        "region": "us-east-1"
    }
}