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77 lines
3.2 KiB
ReStructuredText
77 lines
3.2 KiB
ReStructuredText
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=====================
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Client access control
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=====================
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Libvirt's client access control framework allows administrators to setup fine
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grained permission rules across client users, managed objects and API
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operations. This allows client connections to be locked down to a minimal set of
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privileges.
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.. contents::
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Access control introduction
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---------------------------
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In a default configuration, the libvirtd daemon has three levels of access
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control. All connections start off in an unauthenticated state, where the only
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API operations allowed are those required to complete authentication. After
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successful authentication, a connection either has full, unrestricted access to
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all libvirt API calls, or is locked down to only "read only" (see 'Anonymous' in
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the table below) operations, according to what socket a client connection
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originated on.
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The access control framework allows authenticated connections to have fine
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grained permission rules to be defined by the administrator. Every API call in
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libvirt has a set of permissions that will be validated against the object being
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used. For example, the ``virDomainSetSchedulerParametersFlags`` method will
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check whether the client user has the ``write`` permission on the ``domain``
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object instance passed in as a parameter. Further permissions will also be
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checked if certain flags are set in the API call. In addition to checks on the
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object passed in to an API call, some methods will filter their results. For
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example the ``virConnectListAllDomains`` method will check the
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``search_domains`` on the ``connect`` object, but will also filter the returned
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``domain`` objects to only those on which the client user has the ``getattr``
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permission.
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Access control drivers
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----------------------
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The access control framework is designed as a pluggable system to enable future
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integration with arbitrary access control technologies. By default, the ``none``
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driver is used, which does no access control checks at all. At this time,
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libvirt ships with support for using
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`polkit <https://www.freedesktop.org/wiki/Software/polkit/>`__ as a real access
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control driver. To learn how to use the polkit access driver consult `the
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configuration docs <aclpolkit.html>`__.
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The access driver is configured in the ``libvirtd.conf`` configuration file,
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using the ``access_drivers`` parameter. This parameter accepts an array of
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access control driver names. If more than one access driver is requested, then
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all must succeed in order for access to be granted. To enable 'polkit' as the
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driver:
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::
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# augtool -s set '/files/etc/libvirt/libvirtd.conf/access_drivers[1]' polkit
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And to reset back to the default (no-op) driver
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::
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# augtool -s rm /files/etc/libvirt/libvirtd.conf/access_drivers
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**Note:** changes to libvirtd.conf require that the libvirtd daemon be
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restarted.
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Objects and permissions
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-----------------------
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Libvirt applies access control to all the main object types in its API. Each
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object type, in turn, has a set of permissions defined. To determine what
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permissions are checked for specific API call, consult the `API reference
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manual <html/index.html>`__ documentation for the API in question.
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.. raw:: html
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<div id="include" filename="aclperms.htmlinc"/>
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