Rule fields
Understand what role each field in a rule plays
A Falco rule can contain the following keys:
Key | Required | Description | Default |
---|---|---|---|
rule | yes | A short, unique name for the rule. | |
condition | yes | A filtering expression that is applied against events to check whether they match the rule. | |
desc | yes | A longer description of what the rule detects. | |
output | yes | Specifies the message that should be output if a matching event occurs. See output. | |
priority | yes | A case-insensitive representation of the severity of the event. Should be one of the following: emergency , alert , critical , error , warning , notice , informational , debug . | |
exceptions | no | A set of exceptions that cause the rule to not generate an alert. | |
enabled | no | If set to false , a rule is neither loaded nor matched against any events. | true |
tags | no | A list of tags applied to the rule (more on this below). | |
warn_evttypes | no | If set to false , Falco suppresses warnings related to a rule not having an event type (more on this below). | true |
skip-if-unknown-filter | no | If set to true , if a rule conditions contains a filtercheck, e.g. fd.some_new_field , that is not known to this version of Falco, Falco silently accepts the rule but does not execute it; if set to false , Falco repots an error and exists when finding an unknown filtercheck. | false |
source | no | The event source for which this rule should be evaluated. Typical values are syscall , k8s_audit , or the source advertised by a source plugin. | syscall |
append | no | When set to true , it adds conditions and/or exceptions to a previously defined rule or macro instead of overseeding it. Not used when the goal is just to enable an already existing rule. In case of appending to a list, it adds new elements to it. |
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Last modified Aug 18, 2023: fix: remanents of relative links (e22d709)