Github user dmuntima commented on a diff in the pull request:
https://github.com/apache/qpid-dispatch/pull/255#discussion_r171513534
--- Diff: doc/new-book/configuration-security.adoc ---
@@ -412,3 +414,356 @@ listener {
For more information about these attributes, see
xref:adding_sasl_authentication_to_incoming_connection[].
--
+
+== Authorizing Access to Messaging Resources
+
+You can restrict the number of user connections, and control access to
AMQP messaging resources by configuring _policies_.
+
+=== Types of Policies
+
+You can configure two different types of policies: _global policies_ and
_vhost policies_.
+
+Global policies::
+Settings for the router. A global policy defines the maximum number of
incoming user connections for the router (across all vhost policies), and
defines how the router should use vhost policies.
+
+Vhost policies::
+Connection and AMQP resource limits for a messaging endpoint (called an
AMQP virtual host, or _vhost_). A vhost policy defines what a client can access
on a messaging endpoint over a particular connection.
++
+[NOTE]
+====
+A vhost is typically the name of the host to which the client connection
is directed. For example, if a client application opens a connection to the
`amqp://mybroker.example.com:5672/queue01` URL, the vhost would be
`mybroker.example.com`.
+====
+
+The resource limits defined in global and vhost policies are applied to
user connections only. The limits do not affect inter-router connections or
router connections that are outbound to waypoints.
+
+=== How {RouterName} Applies Policies
+
+When a client connects to a router, the router determines whether to
permit the connection based on the global and vhost policies, and the following
properties of the connection:
+
+* The host to which the connection is directed (the vhost)
+* The connection's authenticated user name
+* The host from which the client is connecting (the remote host)
+
+If the connection is permitted, then the router applies a vhost policy
that matches the vhost to which the connection is directed. The vhost policy
limits are enforced for the lifetime of the connection.
+
+=== Configuring Global Policies
+
+You can set the incoming connection limit for the router and define how it
should use vhost policies by configuring a global policy.
+
+.Procedure
+
+* In the router configuration file, add a `policy` section.
++
+--
+[options="nowrap",subs="+quotes"]
+----
+policy = {
+ maxConnections: 10000 // <1>
+ enableVhostPolicy: true // <2>
+ policyDir: /etc/qpid-dispatch/policies/ // <3>
+ defaultVhost: $default // <4>
+}
+----
+<1> The maximum number of concurrent client connections allowed for this
router. This limit is always enforced, even if no other policy settings have
been defined. The limit is applied to all incoming connections regardless of
remote host, authenticated user, or targeted vhost. The default value is
`65535`.
+
+<2> Enables the router to enforce the connection denials and resource
limits defined in the configured vhost policies. The default is `false`, which
means that the router will not enforce any vhost policies.
++
+[NOTE]
+====
+Setting `enableVhostPolicy` to `false` improves the router's performance.
+====
+
+<3> The absolute path to a directory that holds vhost policy definition
files in JSON format (`*.json`). The router processes all of the vhost policies
in each JSON file that is in this directory. For more information, see
xref:configuring-vhost-policies-json[].
+
+<4> The name of the default vhost policy, which is applied to any
connection for which a vhost policy has not been configured. The default is
`$default`. If `defaultVhost` is not defined, then default vhost processing is
disabled.
+--
+
+=== Configuring Vhost Policies
+
+You configure vhost policies to define the connection limits and AMQP
resource limits for a messaging endpoint.
+
+A vhost policy consists of the following:
+
+* Connection limits
++
+These limits control the number of users that can be connected to the
vhost simultaneously.
+
+* User groups
++
+A user group defines the messaging resources that the group members are
permitted to access. Each user group defines the following:
+
+** A set of users that can connect to the vhost (the group members)
+** The remote hosts from which the group members may connect to the router
network
+** The AMQP resources that the group members are permitted to access on
the vhost
+
+You can configure vhost policies directly in the router configuration
file, or create them as JSON files.
--- End diff --
Add links to the text "router configuration file" and " create them as JSON
files" for the respective sections.
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