Rule Format Version
From time to time, we make changes to the rules file format that are not backwards-compatible with older versions of Falco. Similarly, libsinsp and libscap may define new filtercheck fields, operators, etc. We want to denote that a given set of rules depends on the fields/operators from those libraries.
There are currently two optional fields in the falco rules file related to versioning:
|Used to track compatibility between rules content and the falco engine version.
|Used to track compatibility between rules content and plugin versions.
Falco Engine Versioning
falco executable and the
falco_engine C++ object now support returning a version number. The initial version is 2 (implying that prior versions were 1). We will increment this version whenever we make an incompatible change to the rules file format or add new fields, events or syntax elements to Falco. You can check the Falco engine version that your installation supports by running
Falco Rules File Versioning
The Falco rules files included with Falco include a new top-level object,
required_engine_version: N, that specifies the minimum engine version required to read this rules file. If not included, no version check is performed when reading the rules file. Here's an example:
# This rules file requires a falco with falco engine version 7.
- required_engine_version: 7
If a rules file has an
engine_version greater than the Falco engine version, the rules file is loaded and an error is returned.
Official Rules File Versioning
If you use the official rules distributed by the Falco organization, they are versioned in the repository along with the relevant changelog.
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