mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-11-09 15:00:07 +00:00
af1b89d1d4
Since libvirt.h was split into multiple files and similarly docs/libvirt-libvirt.html, docs/hvsupport.html have bad hyperlinks. The same happens for all the html.in files that used <code class='docref'> tag, because page.xsl has no idea where to point the link that's found. Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
101 lines
3.9 KiB
XML
101 lines
3.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<body>
|
|
<h1>Client access control</h1>
|
|
<p>
|
|
Libvirt's client access control framework allows administrators
|
|
to setup fine grained permission rules across client users,
|
|
managed objects and API operations. This allows client connections
|
|
to be locked down to a minimal set of privileges.
|
|
</p>
|
|
|
|
<ul id="toc"></ul>
|
|
|
|
<h2><a name="intro">Access control introduction</a></h2>
|
|
|
|
<p>
|
|
In a default configuration, the libvirtd daemon has three levels
|
|
of access control. All connections start off in an unauthenticated
|
|
state, where the only API operations allowed are those required
|
|
to complete authentication. After successful authentication, a
|
|
connection either has full, unrestricted access to all libvirt
|
|
API calls, or is locked down to only "read only" operations,
|
|
according to what socket a client connection originated on.
|
|
</p>
|
|
|
|
<p>
|
|
The access control framework allows authenticated connections to
|
|
have fine grained permission rules to be defined by the administrator.
|
|
Every API call in libvirt has a set of permissions that will
|
|
be validated against the object being used. For example, the
|
|
<code>virDomainSetSchedulerParametersFlags</code> method will
|
|
check whether the client user has the <code>write</code>
|
|
permission on the <code>domain</code> object instance passed
|
|
in as a parameter. Further permissions will also be checked
|
|
if certain flags are set in the API call. In addition to
|
|
checks on the object passed in to an API call, some methods
|
|
will filter their results. For example the <code>virConnectListAllDomains</code>
|
|
method will check the <code>search_domains</code> on the <code>connect</code>
|
|
object, but will also filter the returned <code>domain</code>
|
|
objects to only those on which the client user has the
|
|
<code>getattr</code> permission.
|
|
</p>
|
|
|
|
<h2><a name="drivers">Access control drivers</a></h2>
|
|
|
|
<p>
|
|
The access control framework is designed as a pluggable
|
|
system to enable future integration with arbitrary access
|
|
control technologies. By default, the <code>none</code>
|
|
driver is used, which does no access control checks at
|
|
all. At this time, libvirt ships with support for using
|
|
<a href="http://www.freedesktop.org/wiki/Software/polkit/">polkit</a> as a real access
|
|
control driver. To learn how to use the polkit access
|
|
driver consult <a href="aclpolkit.html">the configuration
|
|
docs</a>.
|
|
</p>
|
|
|
|
<p>
|
|
The access driver is configured in the <code>libvirtd.conf</code>
|
|
configuration file, using the <code>access_drivers</code>
|
|
parameter. This parameter accepts an array of access control
|
|
driver names. If more than one access driver is requested,
|
|
then all must succeed in order for access to be granted.
|
|
To enable 'polkit' as the driver:
|
|
</p>
|
|
|
|
<pre>
|
|
# augtool -s set '/files/etc/libvirt/libvirtd.conf/access_drivers[1]' polkit
|
|
</pre>
|
|
|
|
<p>
|
|
And to reset back to the default (no-op) driver
|
|
</p>
|
|
|
|
|
|
<pre>
|
|
# augtool -s rm /files/etc/libvirt/libvirtd.conf/access_drivers
|
|
</pre>
|
|
|
|
<p>
|
|
<strong>Note:</strong> changes to libvirtd.conf require that
|
|
the libvirtd daemon be restarted.
|
|
</p>
|
|
|
|
<h2><a name="perms">Objects and permissions</a></h2>
|
|
|
|
<p>
|
|
Libvirt applies access control to all the main object
|
|
types in its API. Each object type, in turn, has a set
|
|
of permissions defined. To determine what permissions
|
|
are checked for specific API call, consult the
|
|
<a href="html/index.html">API reference manual</a>
|
|
documentation for the API in question.
|
|
</p>
|
|
|
|
<div id="include" filename="aclperms.htmlinc"/>
|
|
|
|
</body>
|
|
</html>
|