Jwtear

A modular command-line tool to parse, create and manipulate JSON Web Token(JWT) tokens for security testing purposes.

Features

Complete modularity.
- All commands are plugins.
- Easy to add new plugins.
- Support JWS and JWE tokens.
Easy interface for plugins. (follow the template example)
Flexible
token generation based on production-class libraries (e.g. json-jwt, jwe).

Available plugins

Parse: parses jwt tokens.
jws: manipulate and generate JWS tokens.
jwe: manipulate and generate JWE tokens.
bruteforce: brutefocing JWS signing key
wiki: contains offline information about JWT, attacks ideas, references.

Installation

install it yourself as:

$ gem install jwtear

Usage

Show the main menu

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NAME
    jwtear - Parse, create and manipulate JWT tokens.

SYNOPSIS
    jwtear [global options] command [command options] [arguments...]

GLOBAL OPTIONS
    -v, --version - Check current and latest version
    -h, --help    - Show this help message

COMMANDS
    help            - Shows a list of commands or help for one command
    bruteforce, bfs - plugin to offline bruteforce and crack token's signature.
    jws, s          - Generate signature-based JWT (JWS) token.
    jwe, e          - Generate encryption-based JWT (JWE) token.
    parse           - Parse JWT token (accepts JWS and JWE formats).
    wiki, w         - A JWT wiki for hackers.

Show a subcommand help, use -h COMMAND

$jwtear -h jws

NAME
    jws - Generate signature-based JWT (JWS) token.

SYNOPSIS
    jwtear [global options] jws [command options] 

DESCRIPTION
    Generate JWS and JWE tokens. 

COMMAND OPTIONS
    -h, --header=JSON               - JWT header (JSON format). eg. {"typ":"JWT","alg":"HS256"}. Run 'jwtear gen -l' for supported algorithms. (required, default: none)
    -p, --payload=JSON              - JWT payload (JSON format). eg. {"login":"admin"} (required, default: none)
    -k, --key=PASSWORD|PUB_KEY_FILE - Key as a password string or a file public key. eg. P@ssw0rd  | eg. public_key.pem (default: none)

Use a plugin

plugins are defined as subcommands. Each subcommand may have one or more argument and/or switches.

$ jwtear parse -t eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.J8SS8VKlI2yV47C4BtfYukWPx_2welF34Mz7l-MNmkE
$ jwtear jws -h '{"alg":"HS256","typ":"JWT"}' -p '{"user":"admin"}' -k p@ss0rd123
$ jwtear jwe -header '{"enc":"A192GCM","typ":"JWT"}' --payload '{"user":"admin"}' --key public.pem 
$ jwtear bruteforce -v -t eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyIjpudWxsfQ.Tr0VvdP6rVBGBGuI_luxGCOaz6BbhC6IxRTlKOW8UjM -l ~/tmp/pass.list

Add plugin

To add a new plugin, create a new ruby file under plugins directory with the following structure

module JWTear
  module CLI
    extend GLI::App
    extend JWTear::Helpers::Extensions::Print
    extend JWTear::Helpers::Utils

    desc "Plugin short description"
    long_desc "Plugin long description"
    command [:template, :pt] do |c|
      c.action do |global, options, arguments|
        print_h1 "Plugin template"
        print_good "Hi, I'm a template."
        template = TemplatePlugin.new
      end
    end
  end

  module Plugin
    class TemplatePlugin
      include JWTear::Helpers::Extensions::Print
      include JWTear::Helpers::Utils

      def initialize
        check_dependencies
        # ..code...
      end
     
      # ..code...
    end
  end
end

Instead of including all dependencies for each plugin into jwtear, you can add these dependencies as a hash to check_dependencies method which will require the library and throw a gentle error to the user to install any missing gems.

The hash key is the gem name to install, the hash value is the require string

deps = {'async-io' => 'async/ip'}
check_dependencies(deps)

Once the missing dependencies are installed by the user, the check_dependencies will require them once the plugin class initiated.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/jwtear.

Fork it ( https://github.com/KINGSABRI/jwtear/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create a new Pull Request

Areas to contribute

contribution by reporting bugs.
contribution by perfecting the current code.
contribution by adding new plugins.
contribution by enhancing the jwtear wiki.
contribution by requesting features and/or plugins.

License

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

jwtear

Runtime