Trestle is an ensemble of tools that enable the creation, validation, and governance of documentation artifacts for compliance needs. It leverages NIST's OSCAL as a standard data format for interchange between tools and people, and provides an opinionated approach to OSCAL adoption.
Trestle is designed to operate as a CICD pipeline running on top of compliance artifacts in git, to provide transparency for the state of compliance across multiple stakeholders in an environment friendly to developers. Trestle passes the generated artifacts on to tools that orchestrate the enforcement, measurement, and reporting of compliance.
It also provides tooling to manage OSCAL documents in a more human-friendly manner. By splitting large OSCAL data structures into smaller and easier to edit sub-structures, creation and maintenance of these artifacts, or facsimilies in markdown, can follow normal git workflows including peer review via pull request, versioning, releases/tagging.
Trestle provides three separate but related functions in the compliance space:
Manage OSCAL documents to allow editing and manipulation while making sure the schemas are enforced
Transform documents from other formats to OSCAL
Provide support and governance to author compliance content as markdown and drawio.
Trestle provides tooling to help orchestrate the compliance process across a number of dimensions:
Help manage OSCAL documents in a more human-friendly manner by expanding the large OSCAL data structures into smaller and easier to edit sub-structures while making sure the schemas are enforced.
Transform documents from other formats to OSCAL
Provide governance for markdown documents and enforce consistency of format and content based on specified templates
Tooling manage authoring and governance of markdown and drawio files withn a repository.
Support within trestle to streamline management within a managed git environment.
An underlying object model that supports developers interacting with OSCAL artefacts.
Important Note:
The current version of trestle supports NIST OSCAL 1.0.2. There as a breaking change in OSCAL moving from
version 1.0.0 to 1.0.2 mainly due to prop becoming props in AssessmentResults. As a result, the current development
path of trestle requires OSCAL 1.0.2, but for those who require OSCAL 1.0.0 please use trestle version 0.37.x. That version
is stable but will not have any features added, and we encourage users to move to OSCAL 1.0.2 and trestle 1.0.0.
OSCAL version 1.0.0 files are still handled on import but any AssessmentResults must conform to the OSCAL 1.0.2 schema, with
props instead of prop. And all files created by trestle will be output as OSCAL version 1.0.2.
Why Trestle
Compliance suffers from being a complex topic that is hard to articulate simply. It involves complete and accurate execution of multiple procedures across many disciplines (e.g. IT, HR, management) with periodic verification and audit of those procedures against controls.
While it is possible to manage the description of controls and how an organisation implements them in ad hoc ways with general tools (spreadsheets, documents), this is hard to maintain for multiple accreditations and, in the IT domain at least, creates a barrier between the compliance efforts and the people doing daily work (DevOps staff).
Trestle aims to reduce or remove this barrier by bringing the maintenance of control descriptions into the DevOps domain. The goal is to have changes to the system (for example, updates to configuration management) easily related to the controls impacted, and to enable modification of those controls as required in concert with the system changes.
Trestle implicitly provides a core opinionated workflow driven by its pipeline steps to allow standardized interlocks with other compliance tooling platforms.
Machine readable compliance format
Compliance activities at scale, whether size of estate or number of accreditations, require automation to be successful and repeatable. OSCAL as a standard allows teams to bridge between the "Governance" layer and operational tools.
By building human managed artifacts into OSCAL, Trestle is not only able to validate the integrity of the artifacts that people generate - it also enables reuse and sharing of artifacts, and furthermore can provide suitable input into tools that automate operational compliance.
Supported OSCAL elements and extensions
trestle implicitly supports all OSCAL schemas for use within the object model. The development roadmap for trestle includes adding workflow around specific elements / objects that is opinionated.
trestle supports OSCAL version 1.0.0 only at this stage.
Supported file formats for OSCAL objects
OSCAL supports xml, json and yaml with their metaschema tooling. Trestle
natively supports only json and yaml formats at this time.
Future roadmap anticipates that support for xml import and upstream references will be enabled. However, it is expected
that full support will remain only for json and yaml.
Users needing to import XML OSCAL artifacts are recommended to look at NIST's XML to json conversion page here.
Python codebase, easy installation via pip
Trestle runs on almost all Python platforms (e.g. Linux, Mac, Windows), is available on PyPi and can be easily installed via pip. It is under active development and new releases are made available regularly.
To install run: pip install compliance-trestle
See Install trestle in a python virtual environment for the full installation guide.
Complete documentation and tutorials
Complete documentation, tutorials, and background on compliance can be found here.
Demos
A collection of demos utilizing trestle can be found in the related project compliance-trestle-demos.
Development status
Compliance trestle is currently stable and is based on NIST OSCAL version 1.0.2, with active development continuing.
Contributing to Trestle
Our project welcomes external contributions. Please consult contributing to get started.
License & Authors
If you would like to see the detailed LICENSE click here.
Consult contributors for a list of authors and maintainers for the core team.
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