Jwtear - Modular Command-Line Tool To Parse, Create And Manipulate JWT Tokens For Hackers

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:

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. [email protected] | 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 [email protected]
$ 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.