CLI to allow easy aws role assumption.

Assuming roles in AWS via the CLI is clunky with the default tooling. You need to do something like this:

# Assume the role. Man that's a long string to have to paste on the CLI!
aws sts assume-role --role-arn arn:aws:iam::123456789012:role/xaccounts3access --role-session-name s3-access-example

# Now copy the secret key, access key, and token from the output and paste it:
export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_KEY=...
export AWS_SESSION_TOKEN=...

# Okay, NOW you can do stuff using the role....

Before doing this, you need to have the following environment variables exported:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• AWS_MFA_SERIAL -- you only need this if you require MFA for role assumption (which hopefully, you do).
• AWS_DEFAULT_REGION

I suggest putting these into a ~/.secrets file so you don't type this stuff out all the time.

Once this is done, you can do the following:

1. Create a ~/.aws_roles file. It's yaml, and it looks like this:

my_role: arn:aws:iam::123456789012:role/xaccounts3access
my_other_role: arn:aws:iam::2109876312412:otherrole/admin

2. Assume the role:

# You'll get prompted for your MFA token if necessary:
eval `aws-role -r my_role`

# Now do the things!
aws s3 ls # etc

3. Oh you want to login to the UI or print out a link? No problem!

# Uses "open" under the hood, only works on OSX:
aws-role -r my_role --ui

# Just print out the url instead of opening it:
aws-role -r my_role --url

gem install aws-role

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/sheax0r/aws-role.