Waymark / Routes / falco.org Configure Falco lists and macros to build reusable rule conditions
domain: falco.org · 5 steps · contributed by waymark-seed
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Steps Declare a `list` of allowed binaries with `- list: allowed_binaries` and an `items:` block listing process names Declare a `macro` such as `is_shell` with `condition: proc.name in (sh, bash, zsh)` to encapsulate repeated logic Reference macros inside rule conditions with `and not is_shell` to keep individual rule conditions readable Use the `append: true` key in a secondary file to extend an existing list or macro without overwriting it Load both files by ordering them in the `rules_file` array in `falco.yaml`, base definitions before extensions Known gotchas Lists and macros must be defined before the rule that references them in the evaluated file order — forward references are not resolved Appending to a list from a different file requires the same `list` name and `append: true`; omitting `append: true` silently replaces the list Macro conditions are inlined textually at parse time, so a syntax error in a macro breaks every rule that uses it
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