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feat(agent): run the service at MCS level s0:c1023 on SELinux systems - #208
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The packaged unit sets SELinuxContext= with a leading "-", so the agent keeps its unconfined service domain but gets a category of its own. The label changes nothing by itself: on the targeted policy MCS binds only container domains for file access. It lets an SELinux policy single the agent process out, for example with a constraint that refuses signals from senders at a lower level, without a module per node. Where the policy lacks the type systemd ignores the failure, and the directive is skipped where SELinux is disabled. Document the category in the hardening guide and on the SELinux policy type page.
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The packaged unit sets SELinuxContext= with a leading "-", so the agent keeps its unconfined service domain but gets a category of its own. The label changes nothing by itself: on the targeted policy MCS binds only container domains for file access. It lets an SELinux policy single the agent process out, for example with a constraint that refuses signals from senders at a lower level, without a module per node. Where the policy lacks the type systemd ignores the failure, and the directive is skipped where SELinux is disabled.
Document the category in the hardening guide and on the SELinux policy type page.