OWASP Threat Dragon

Threat modelling is widely regarded as a powerful way to build security into the design of applications early in a secure development lifecycle. At its best, it is especially good for

• Ensuring defence-in-depth
• Establishing consistent security design patterns across an application
• Flushing out security requirements and user stories

OWASP Threat Dragon provides a free, open-source, threat modelling application for teams implementing the STRIDE approach. It can also be used for categorising threats using LINDDUN and CIA. The key areas of focus for the tool is:

• Great UX - using Threat Dragon should be simple, engaging and fun
• A powerful threat/mitigation rule engine - this lowers the barrier to entry for teams and allow non-specialists to contribute
• Integration points with other development lifecycle tools - when implemented this will ensure that models slot easily into the development lifecycle and remain relevant as the project evolves

Testers

Easy user experience is one of the key goals for the project and to get that right it needs more users! If you would like to try the tool out, the released versions are on the web application github.

The desktop variant has installers for Linux, Windows and MacOS which be downloaded from the desktop project github.

To help you get started, take a look at the documentaion area.

If you are still having problems, let us know and we will be pleased to help ([email protected] and [email protected]). All feedback is very welcome, so either email us or add an issue on the GitHub repo.

Coding

Coding help of any kind is always welcome. The project builds easily (let us know if you have any problems) so getting up and running should be simple. There are some developer notes in the core threat dragon repo to help get started with this project.

Threat rule engine

If you are not into javascript, you can still help! We want to create a powerful threat generation rule engine to enhance the one that is in place for the early releases. If you can contribute in this area by defining rules, that would be great.

FAQs

• What browsers can be used for Threat Dragon?

• Hold on…isn’t this the same as Mozilla’s SeaSponge?

• Why do the earlier releases come from Mike Goodwin’s repo, not the OWASP repo?

• Why do I get ‘developer can not be verified’ errors after installing on MacOS?

• Can I run Threat Dragon from a command line?

Mike Goodwin’s initial Vision for the project:

The overall vision for the project is to implement a tool that removes as many barriers as possible for organisations wanting to embed threat modelling into their development lifecycle. Barriers I have seen are:

• Lack of cross platform tooling: Tool needs to be x-platform
• Poor UX in existing tools, productivity is poor: Great UX is a must
• Steep learning curve for adopting teams: Tool to build in expert knowledge to help the team get started
• Models are ignored: Integration with other lifecycle tools is key

Initial high level plan:

Milestone 1: Alpha release - Basic threat modelling experience

• Architecture review of the existing prototype with refinement/change where required - complete: Confirmed JointJs works fine, Storage model changed and addition of Electon based desktop variant. Nools rule engine (no longer supported) replaced by json-rules-engine. Shifted from Grunt/Bower to NPM/Browserify
• Secure design review and implementation of findings
• Development of tests (unit and manual) - complete: Codecov report
• Draft end user documentation - complete: GitHub pages
• “Publicity drive” to sign up alpha/beta users and generate feedback Some progress on this. The desktop app has had 13k downloads - unclear how many people are actually using it. The GH repo for the desktop version has 79 stars. The web version gets about 94 unique visitors per day on average and the GH repo has 229 stars.

Milestone 2: Beta release - Threat/mitigation rule engine

• Refinement of UX based on feedback from the alpha release
• (Some) feature enhancements based on feedback from the alpha release Implemented some feature requests (e.g. snap-to-grid) and fixed issues reports (e.g. save bugs) by users
• Implementation of a rule engine for generation of threats/mitigations
• Updated tests and end-user documentation

Milestone 3: Release 1

• Key refinements, bug fixes and new features based on feedback from the beta release
• Complete end user documentation
• Penetration test

Milestone 4 - Dev lifecycle integration

• Detailed scope to be defined, but in general the vision is to support hooks into issue tracking and requirements management tool so that threats/mitigations can be tracked through to implementation and test

Timeframes

This is hard to estimate as it could change a lot if there were other developers involved. Based on my current velocity with just me, I would say release 1 could be complete in 1 year (optimistically).

Technology

The technical architecture is javascript from top to bottom. In the client the key libraries are Angular for the MVC architecture and JointJS for the diagramming. JointJS has a log of great features, but is not a perfect fit for Angular. This needs a review. In the prototype, all storage is done on the client using browser local storage.

Following an architecture review the following key changes were made:

• A new Electron based, installable desktop variant was introduced using the local file system for model storage
• The web variant was changed to use GitHub for model storage - other source control systems will follow (e.g. BitBucket)
• Seperation of common code into a new NPM package, shared between the web and desktop variants
• The Nools rule engine will be replaced since it is no longer maintained

Challenges

• Getting enough usage of the alpha and beta to get the UX and rule engine right
• Finding a sustainable way to host it, especially to support deeper GitHub/BitBucket/Etc. integration

Minimum Viable Product

1. Application source code for a threat modeling tool
2. End user documentation for the tool
3. An online hosted version of the tool
4. An installable, cross-platform desktop version of the tool

Releases