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Utilities to upgrade STIX and CybOX content to 2.0

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cti-stix-elevator

NOTE: This is an OASIS TC Open Repository. See the Governance section for more information.

The stix2-elevator is a software tool for converting STIX 1.x XML to STIX 2.0 JSON. Due to the differences between STIX 1.x and STIX 2.0, this conversion is best-effort only, and stix2-elevator cannot convert from STIX 2.0 JSON back to STIX 1.x XML. During the conversion, stix2- elevator provides information on the assumptions it needs to make to produce valid STIX 2.0 JSON, and what information was not able to be converted.

The stix2-elevator is a work-in-progress. It should be used to explore how existing STIX 1.x would potentially be represented in STIX 2.0. Using the current version of the elevator will provide insight to issues that might need to be mitigated to convert your STIX 1.x content.

It should not be used in a production environment, and should not be considered final.

STIX 1.x Composite Indicator Expressions and CybOX 2.x Composite Observable Expressions allow a level of flexibility not present in STIX 2 patterns. These composite expressions can frequently have ambiguous interpretations, so STIX 2 Indicators created by the stix2-elevator from STIX 1.x Indicators containing composite expressions should be inspected to ensure the STIX 2 Indicator has the intended meaning.

Please enter any comments on how to improve it into the issue tracker.

Requirements

  • Python 2.7, or 3.4+

  • python-stix and its dependencies

    Note

    Make sure to use either the latest version of python-stix 1.1.1.x or 1.2.0.x, depending on whether you want to support STIX 1.1.1 or STIX 1.2.

  • python-stix2 >= 0.5.1

  • stix2-validator >= 0.4.0 and its dependencies

  • pycountry >= 1.20

  • stixmarx >= 1.0.3

Installation

Install with pip:

$ pip install stix2-elevator

This will install all necessary dependencies, including the latest version of python-stix.

If you need to support older STIX 1.1.1 content, install python-stix 1.1.1.x first:

$ pip install 'stix<1.2'
$ pip install stix2-elevator

You can also install the stix2-elevator from GitHub to get the latest (unstable) version:

$ pip install git+https://github.com/oasis-open/cti-stix-elevator.git

Usage

It is recommended that you insure that the input STIX 1.x file is valid before submitting it to the elevator. Use the stix-validator.

As A Script

The elevator comes with a bundled script which you can use to elevate STIX 1.1.1 - 1.2.1 content to STIX 2.0 content:

$ stix2_elevator
usage: stix2_elevator [-h] [--incidents] [--no-squirrel-gaps]
          [--package-created-by-id PACKAGE_CREATED_BY_ID]
          [--default-timestamp DEFAULT_TIMESTAMP]
          [--validator-args VALIDATOR_ARGS] [-e ENABLE] [-d DISABLE] [-s]
          [--message-log-directory MESSAGE_LOG_DIRECTORY]
          [--log-level {DEBUG,INFO,WARN,ERROR,CRITICAL}]
          [-m MARKINGS_ALLOWED] [-p {no_policy,strict_policy}]
          file

stix2-elevator v1.1.0

The stix2-elevator is a work-in-progress. It should be used to explore how existing STIX 1.x would potentially be represented in STIX 2.0. Using the current version of the stix2-elevator will provide insight to issues that might need to be mitigated to convert your STIX 1.x content.

positional arguments:
file The input STIX 1.x document to be elevated.
optional arguments:
-h, --help show this help message and exit
--incidents Incidents will be included in the conversion.
--no-squirrel-gaps
 Do not include STIX 1.x content that cannot be represented directly in STIX 2.0 using the description property.
--infrastructure
 Infrastructure will be included in the conversion.
--package-created-by-id PACKAGE_CREATED_BY_ID
 Use provided identifier for “created_by_ref” properties. Example: –package-created-by-id “identity –1234abcd-1a12-12a3-0ab4-1234abcd5678”
--default-timestamp DEFAULT_TIMESTAMP
 Use provided timestamp for properties that require a timestamp. Example: –default-timestamp “2016-11-15T13:10:35.053000Z”
--validator-args VALIDATOR_ARGS
 Arguments to pass to stix-validator. Default: –strict-types Example: stix2_elevator.py <file> –validator-args=”-v –strict-types -d 212”
-e ENABLE, --enable ENABLE
 A comma-separated list of the stix2-elevator messages to enable. If the –disable option is not used, no other messages will be shown. Example: stix2_elevator.py <file> –enable 250
-d DISABLE, --disable DISABLE
 A comma-separated list of the stix2-elevator messages to disable. Example: stix2_elevator.py <file> –disable 212,220
-s, --silent If this flag is set, all stix2-elevator messages will be disabled.
--message-log-directory MESSAGE_LOG_DIRECTORY
 If this flag is set, all stix2-elevator messages will be saved to file. The name of the file will be the input file with extension .log in the specified directory. Note, make sure the directory already exists. Example: stix2_elevator.py <file> –message- log-directory “..logs”
–log-level {DEBUG,INFO,WARN,ERROR,CRITICAL}
The logging output level.
-m MARKINGS_ALLOWED, --markings-allowed MARKINGS_ALLOWED
 Avoid error exit, if these markings are in the content, but not supported by the elevator. Specify as a comma-separated listExample: stix2_elevator.py < file > –markings-allowed “ISAMarkingsAssertion,ISAMarkings”
-p {no_policy,strict_policy}, –policy {no_policy,strict_policy}
The policy to deal with errors

Refer to elevator_log_messages.rst for all stix2-elevator messages. Use the associated code number to –enable or –disable a message. By default, the stix2-elevator displays all messages. Note: disabling the message does not disable the functionality.

As A Library

You can also use this library to integrate STIX elevation into your own tools. You can elevate a STIX 1.x file:

from stix2elevator import elevate_file
from stix2elevator.options import initialize_options

intialize_options()
results = elevate_file("stix_file.xml")
print(results)

Additionally, a similar method exists to accept a string as an argument:

from stix2elevator import elevate_string
from stix2elevator.options import initialize_options

intialize_options()
results = elevate_string("...")
print(results)

To set options, use set_option_value, found in options.py

Governance

This GitHub public repository ( https://github.com/oasis-open/cti-stix-elevator ) was proposed and approved [bis] by the OASIS Cyber Threat Intelligence (CTI) TC as an OASIS TC Open Repository to support development of open source resources related to Technical Committee work.

While this TC Open Repository remains associated with the sponsor TC, its development priorities, leadership, intellectual property terms, participation rules, and other matters of governance are separate and distinct from the OASIS TC Process and related policies.

All contributions made to this TC Open Repository are subject to open source license terms expressed in the BSD-3-Clause License. That license was selected as the declared “Applicable License” when the TC Open Repository was created.

As documented in “Public Participation Invited”, contributions to this OASIS TC Open Repository are invited from all parties, whether affiliated with OASIS or not. Participants must have a GitHub account, but no fees or OASIS membership obligations are required. Participation is expected to be consistent with the OASIS TC Open Repository Guidelines and Procedures, the open source LICENSE designated for this particular repository, and the requirement for an Individual Contributor License Agreement that governs intellectual property.

Maintainers

TC Open Repository Maintainers are responsible for oversight of this project’s community development activities, including evaluation of GitHub pull requests and preserving open source principles of openness and fairness. Maintainers are recognized and trusted experts who serve to implement community goals and consensus design preferences.

Initially, the associated TC members have designated one or more persons to serve as Maintainer(s); subsequently, participating community members may select additional or substitute Maintainers, per consensus agreements.

Current Maintainers of this TC Open Repository

Feedback

Questions or comments about this TC Open Repository’s activities should be composed as GitHub issues or comments. If use of an issue/comment is not possible or appropriate, questions may be directed by email to the Maintainer(s) listed above. Please send general questions about TC Open Repository participation to OASIS Staff at repository-admin@oasis-open.org and any specific CLA-related questions to repository-cla@oasis-open.org.

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