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access control list

A list of rules saying which client may read or write which topics.

An access control list maps identities (usernames, client IDs or certificate names) to the operations they may perform on which resources; a broker's ACL grants publish and subscribe rights per topic pattern.

Examples

  • The greenhouse ACL file's line pattern write gh1/%u/telemetry/# lets every device publish telemetry only under its own branch, with %u replaced by its username.

  • A dashboard user gets topic read gh1/+/telemetry/# so it can read every bench's readings but publish nothing.

See also

authorization least privilege topic filter topic tree
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