michi 2003/08/14 16:16:52
Added: site/lenya/docs/concepts/accesscontrol
accesscontrollerresolvers.html
accesscontrollers.html accreditablemanagers.html
authenticators.html authorizers.html
policymanagers.html
Log:
Access Controller added
Revision Changes Path
1.1
cocoon-site/site/lenya/docs/concepts/accesscontrol/accesscontrollerresolvers.html
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<h1>Access Controller Resolvers</h1>
</td><td nowrap="nowrap" width="40" align="center"><a class="dida"
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<a name="N101C9"></a><a name="Introduction"></a>
<h3>Introduction</h3>
<div style="margin-left: 0 ; border: 2px">
<p>An AccessControllerResolver resolves the appropriate AccessController for a
URL.</p>
</div>
<a name="N101D3"></a><a name="Defining+the+Roles+in+lenya.roles"></a>
<h3>Defining the Roles in lenya.roles</h3>
<div style="margin-left: 0 ; border: 2px">
<p>To obtain an AccessControllerResolver, the AccessControllerResolverSelector is
used. A component which wants to obtain an AccessController asks the
selector for the <span class="codefrag">composable</span>
AccessControllerResolver.
The <span class="codefrag">composable</span> AccessControllerResolver
itself uses the
selector to obtain its child AccessControllerResolvers.
</p>
<pre class="code"><role
name="org.apache.lenya.cms.ac2.AccessControllerResolverSelector"
shorthand="access-controller-resolvers"
default-class="org.apache.avalon.excalibur.component.ExcaliburComponentSelector">
<hint shorthand="configurable"
class="org.apache.lenya.cms.ac2.ConfigurableAccessControllerResolver"/>
<hint shorthand="publication"
class="org.apache.lenya.cms.ac2.PublicationAccessControllerResolver"/>
<hint shorthand="composable"
class="org.apache.lenya.cms.ac2.ComposableAccessControllerResolver"/>
</role></pre>
</div>
<a name="N101E8"></a><a
name="Declaring+the+Access+Controller+Resolvers+in+cocoon.xconf"></a>
<h3>Declaring the Access Controller Resolvers in cocoon.xconf</h3>
<div style="margin-left: 0 ; border: 2px">
<pre class="code"><access-controller-resolvers>
<component-instance logger="lenya.ac.accesscontrollerresolver.publication"
class="org.apache.lenya.cms.ac2.PublicationAccessControllerResolver"
name="publication">
</component-instance>
<component-instance logger="lenya.ac.accesscontrollerresolver.global"
class="org.apache.lenya.cms.ac2.ConfigurableAccessControllerResolver"
name="global">
<access-controller type="global"/>
</component-instance>
<component-instance logger="lenya.ac.accesscontrollerresolver.composable"
class="org.apache.lenya.cms.ac2.ComposableAccessControllerResolver"
name="composable">
<resolver type="publication"/>
<resolver type="global"/>
</component-instance>
</access-controller-resolvers></pre>
</div>
<a name="N101F4"></a><a name="Publication+Access+Controller+Resolver"></a>
<h3>Publication Access Controller Resolver</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The PublicationAccessControllerResolver looks for a <span
class="codefrag">config/ac.xconf</span>
file inside the publication. If you want to use multiple
AccessControllers
within your Lenya installation, just declare them in the <span
class="codefrag">
cocoon-xconf.xsl</span> file and choose the type in the <span
class="codefrag">
config/ac.xconf</span> file:</p>
<pre class="code"><?xml version="1.0"?>
<access-controller type="publication-file">
<authorizer type="usecase">
<config-file
src="context:///lenya/pubs/default/config/ac/usecase-policies.xml"/>
</authorizer>
<accreditable-manager>
<parameter name="directory"
value="context:///lenya/pubs/default/config/ac/passwd"/>
</accreditable-manager>
</access-controller></pre>
<p>As you see here, you can put additional configuration code inside the
<span class="codefrag"><access-controller></span> element. This
allows you to use
the same AccessController type for multiple publications with different
configurations.</p>
</div>
<a name="N10212"></a><a name="Configurable+Access+Controller+Resolver"></a>
<h3>Configurable Access Controller Resolver</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The ConfigurableAccessControllerResolver can be configured with an
AccessController directly inside <span
class="codefrag">cocoon.xconf</span>:</p>
<pre class="code"><component-instance logger="lenya.ac.accesscontrollerresolver"
class="org.apache.lenya.cms.ac2.ConfigurableAccessControllerResolver"
name="global">
<access-controller type="global"/>
</component-instance> </pre>
</div>
<a name="N10224"></a><a name="Composable+Access+Controller+Resolver"></a>
<h3>Composable Access Controller Resolver</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The ComposableAccessControllerResolver is configured with a list of
AccessControllerResolvers. Each one of these resolvers is invoked
until one
is successful. If no resolver finds an AccessController, the
ComposableAccessControllerResolver returns <span
class="codefrag">null</span>.</p>
<pre class="code"><component-instance logger="lenya.ac.accesscontrollerresolver"
class="org.apache.lenya.cms.ac2.ComposableAccessControllerResolver"
name="composable">
<resolver type="publication"/>
<resolver type="global"/>
</component-instance></pre>
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<a href="policymanagers.html">Policy Managers</a>
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<h1>Access Controllers</h1>
</td><td nowrap="nowrap" width="40" align="center"><a class="dida"
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border="0"><br>
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<a name="N101C9"></a><a name="Introduction"></a>
<h3>Introduction</h3>
<div style="margin-left: 0 ; border: 2px">
<p>An access controller can be used to authenticate entities and to authorize
requests.</p>
</div>
<a name="N101D3"></a><a name="Defining+the+Role+in+lenya.roles"></a>
<h3>Defining the Role in lenya.roles</h3>
<div style="margin-left: 0 ; border: 2px">
<pre class="code"><role name="org.apache.lenya.cms.ac2.AccessController"
shorthand="access-controller"
default-class="org.apache.lenya.cms.ac2.BypassableAccessController"/></pre>
</div>
<a name="N101DF"></a><a name="Declaring+an+AccessController+in+cocoon.xconf"></a>
<h3>Declaring an AccessController in cocoon.xconf</h3>
<div style="margin-left: 0 ; border: 2px">
<p>
Each AccessController component needs a type that is attached to the
role attribute, separated with a slash (/). This allows you to choose
an
AccessController in your publication in combination with the
Publication<a
href="accesscontrollerresolvers.html">AccessControllerResolver</a>.
The following example shows the declaration of an AccessController with
the type <em>global</em>:
</p>
<pre class="code"><component logger="lenya.ac.accesscontroller.global"
class="org.apache.lenya.cms.ac2.BypassableAccessController"
role="org.apache.lenya.cms.ac2.AccessController/global">
...
</component></pre>
</div>
<a name="N101F5"></a><a name="Default+Access+Controller"></a>
<h3>Default Access Controller</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The DefaultAccessController combines an
<a href="authenticators.html">Authenticator</a>, a set of
<a href="authorizers.html">Authorizers</a>, an
<a href="accreditablemanagers.html">AccreditableManager</a>
and a
<a href="policymanagers.html">PolicyManager</a> to perform
these tasks.</p>
<a name="N1020E"></a><a
name="Declaring+an+DefaultAccessController+in+cocoon.xconf"></a>
<h4>Declaring an DefaultAccessController in cocoon.xconf</h4>
<div style="margin-left: 0 ; border: 2px">
<p>
The DefaultAccessController configuration includes the
configuration
of its sub-components, as you see in the following
example:
</p>
<pre class="code"><component logger="lenya.ac.accesscontroller.global"
class="org.apache.lenya.cms.ac2.DefaultAccessController"
role="org.apache.lenya.cms.ac2.AccessController/global">
<accreditable-manager type="file">
<parameter name="directory"
value="context:///lenya/config/ac/passwd"/>
</accreditable-manager>
<policy-manager type="file"/>
<authorizer type="policy"/>
<authorizer type="workflow"/>
<authorizer type="usecase"/>
</component></pre>
</div>
</div>
<a name="N1021E"></a><a name="Bypassable+Access+Controller"></a>
<h3>Bypassable Access Controller</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The BypassableAccessController is a DefaultAccessController that can be
bypassed for certain URL patterns. For URLs that match those patterns
(regular expressions), access is granted for free.</p>
<a name="N10227"></a><a
name="Declaring+an+DefaultAccessController+in+cocoon.xconf-N10224"></a>
<h4>Declaring an DefaultAccessController in cocoon.xconf</h4>
<div style="margin-left: 0 ; border: 2px">
<p>
In addition to the DefaultAccessController, the
BypassableAccessController
allows the definition of a regular expresssion for the
public URL
patterns:
</p>
<pre class="code"><component logger="lenya.ac.accesscontroller.global"
class="org.apache.lenya.cms.ac2.BypassableAccessController"
role="org.apache.lenya.cms.ac2.AccessController/global">
...
<public>.*[.]css|.*[.]jpg|.*[.]gif</public>
</component></pre>
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1.1
cocoon-site/site/lenya/docs/concepts/accesscontrol/accreditablemanagers.html
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</td><td nowrap="nowrap" width="40" align="center"><a class="dida"
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<a name="N101C9"></a><a name="Introduction"></a>
<h3>Introduction</h3>
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<p>An AccreditableManager combines a UserManager, a GroupManager, an
IPRangeManager and a RoleManager.</p>
</div>
<a name="N101D3"></a><a name="UserManager"></a>
<h3>UserManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>A UserManager manages users.</p>
</div>
<a name="N101DD"></a><a name="GroupManager"></a>
<h3>GroupManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>A GroupManager manages groups.</p>
</div>
<a name="N101E7"></a><a name="IPRangeManager"></a>
<h3>IPRangeManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>A IPRangeManager manages IP address rangess.</p>
</div>
<a name="N101F1"></a><a name="RoleManager"></a>
<h3>RoleManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>A RoleManager manages roles.</p>
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1.1
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<a name="N101C9"></a><a name="Introduction"></a>
<h3>Introduction</h3>
<div style="margin-left: 0 ; border: 2px">
<p>An authenticator is used to identify a client.</p>
</div>
<a name="N101D3"></a><a name="Declaring+the+Roles+in+lenya.roles"></a>
<h3>Declaring the Roles in lenya.roles</h3>
<div style="margin-left: 0 ; border: 2px">
<pre class="code"><role name="org.apache.lenya.cms.ac2.Authenticator"
shorthand="authenticator"
default-class="org.apache.lenya.cms.ac2.UserAuthenticator"/></pre>
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<a name="N101DF"></a><a name="UserAuthenticator"></a>
<h3>UserAuthenticator</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The UserAuthenticator uses the request parameters</p>
<ul>
<li>
<span class="codefrag">username</span> and</li>
<li>
<span class="codefrag">password</span>
</li>
</ul>
<p>to authenticate or reject a user.</p>
<pre class="code"><component logger="lenya.ac.authenticator"
class="org.apache.lenya.cms.ac2.UserAuthenticator"
role="org.apache.lenya.cms.ac2.Authenticator"/></pre>
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1.1
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<a name="N101C9"></a><a name="Introduction"></a>
<h3>Introduction</h3>
<div style="margin-left: 0 ; border: 2px">
<p>An authorizer checks if an identity is authorized to invoke a certain request.
The DelegatingAuthorizerAction tries to resolve an AccessController for the URL. If an
AccessController could be resolved, its Authorizer is used to authorize the request.
If no AccessController could be found, the access to the request is granted for
free.</p>
</div>
<a name="N101D3"></a><a name="PolicyAuthorizer"></a>
<h3>PolicyAuthorizer</h3>
<div style="margin-left: 0 ; border: 2px">
<p>A PolicyAuthorizer uses policies for authorizing.</p>
</div>
<a name="N101DD"></a><a name="UsecaseAuthorizer"></a>
<h3>UsecaseAuthorizer</h3>
<div style="margin-left: 0 ; border: 2px">
<p>This authorizer looks for the <span class="codefrag">lenya.usecase</span> request
parameter and checks the usecase policy file for the roles
that are
allowed to execute this usecase. The location of this file is
defined
using the <span class="codefrag"><config-file></span>
tag:</p>
<pre class="code"><authorizer type="usecase">
<config-file
src="context:///lenya/pubs/default/config/ac/usecase-policies.xml"/>
</authorizer></pre>
<p>The usecase policy file might look as follows:</p>
<pre class="code"><?xml version="1.0"?>
<usecases xmlns="http://apache.org/cocoon/lenya/ac/1.0">
<usecase id="create-workflow">
<role id="editor"/>
</usecase>
</usecases></pre>
</div>
<a name="N101FA"></a><a name="WorkflowAuthorizer"></a>
<h3>WorkflowAuthorizer</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The WorkflowAuthorizer is responsible for protecting workflow
transitions. Therefore it</p>
<ul>
<li>looks for the <span class="codefrag">lenya.event</span> request parameter,</li>
<li>determines the current state of the workflow instance, and</li>
<li>checks if the event may be invoked by one of the current roles in this
state.</li>
</ul>
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1.1
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<a name="N101C9"></a><a name="Introduction"></a>
<h3>Introduction</h3>
<div style="margin-left: 0 ; border: 2px">
<p>A PolicyManager is used to resolve the policy for a certain URL. Lenya ships with
the following PolicyManagers:</p>
</div>
<a name="N101D3"></a><a name="InheritingPolicyManager"></a>
<h3>InheritingPolicyManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>This PolicyManager merges the policies of all steps in the URL. For each
URL, a <em>url policy</em> and a <em>subtree policy</em> can
be defined.
The InheritingPolicyManager adds the credentials of</p>
<ul>
<li>the subtree policies for all parent directories of the requested page,</li>
<li>the subtree policy of the requested page, and</li>
<li>the url policy of the requested page.</li>
</ul>
<p>For instance, if the URL is <span class="codefrag">/lenya/news/index.html</span>,
the
following policies are merged:</p>
<ul>
<li>subtree policy of <span class="codefrag">/</span>
</li>
<li>subtree policy of <span class="codefrag">/lenya</span>
</li>
<li>subtree policy of <span class="codefrag">/lenya/news</span>
</li>
<li>subtree policy of <span class="codefrag">/lenya/news/index</span>
</li>
<li>url policy of <span class="codefrag">/lenya/news/index</span>
</li>
</ul>
</div>
<a name="N10211"></a><a name="FilePolicyManager"></a>
<h3>FilePolicyManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The FilePolicyManager is an InheritingPolicyManager. The policies are defined by
policy files that are arranged as a directory tree that reflects the URI space, e.g.:
</p>
<pre class="code">/subtree-policy.acml
/lenya/subtree-policy.acml
/lenya/news/index.html/subtree-policy.acml
/lenya/news/index.html/url-policy.acml</pre>
<p>If a certain policy file does not exist (like /lenya/news in the above example),
an empty policy is used instead.</p>
</div>
<a name="N10223"></a><a name="PublicationFilePolicyManager"></a>
<h3>PublicationFilePolicyManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>This PolicyManager does the same as the FilePolicyManager, except that
the current publication is determined and the policy files are
resolved
relatively to the <span
class="codefrag">publication/config/ac/policies</span> directory.</p>
</div>
<a name="N10230"></a><a name="SitemapPolicyManager"></a>
<h3>SitemapPolicyManager</h3>
<div style="margin-left: 0 ; border: 2px">
<p>The SitemapPolicyManager uses the policy sitemap to resolve the policy
for a certain URL.</p>
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