ShellStrike

A simple ruby gem to automatically identify valid SSH credentials for a server using custom username and password dictionaries.

This gem is intended to be used for educational purposes, and was written to assist with quickly identifying credential combinations for poorly documented internal servers. This gem is intended to be used against servers that you are authorised to 'attack' and the developer takes no responsibility for any issues which may arise due to misuse of this gem.

Add this line to your application's Gemfile:

gem 'shell_strike'

And then execute:

$ bundle

Or install it yourself as:

$ gem install shell_strike

Create a new instance of ShellStrike, passing in an array of ShellStrike::Host objects, an array of usernames and an array of passwords. i.e.

hosts = [
  ShellStrike::Host.new('192.168.1.100'),
  ShellStrike::Host.new('192.168.1.101')
]

usernames = ['admin', 'root']
passwords = ['password', 'letmein']

shell_strike = ShellStrike.new(hosts, usernames, passwords)

shell_strike.identify_credentials!

Access identified credentials using shell_strike.identified_credentials.

ShellStrike includes numerous events which users can consume on each instance of ShellStrike, like this:

 shell_strike = ShellStrike.new(...)
 shell_strike.on(:credentials_identified) do |host, username, password|
  puts "Success! #{username} / #{password} can be used to login to #{host}."
 end
 
 shell_strike.identify_credentials!

The following events are available:

• :credentials_identified => Triggered when valid credentials have been identified. Yields blocks supplied by listeners with three arguments: (1) The host object, (2) the valid username, and (3) the valid password.
• :credentials_failed => Triggered when credential validation fails. Yields blocks supplied by listeners with three arguments: (1) The host object, (2) the invalid username, and (3) the invalid password.

• Add support for user-defineable SSH arguments such as KexAlgorithms and key-based auth.

After checking out the repo, run bin/setup to install dependencies. 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/xtrasimplicity/shell_strike. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the ShellStrike project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.