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From conflue...@apache.org
Subject [CONF] Apache Directory Server v1.5: 1.2. Interceptors (page edited)
Date Fri, 05 Dec 2008 16:55:00 GMT
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table.confluenceTable th.confluenceTh
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DIV.small {
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H1.pagename {
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IMG.inline  {}

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/* How the preview content should be shown */
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.messagecontent { background: #E0E0E0; }

/* How the "This page has been modified..." -comment should be shown. */
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a.createlink {
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}
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}
.previewBoxBottom {
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    border-style: solid;
    border-color: #3c78b5;
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    margin: 0px 0px 5px 0px;
    text-align: center;
}

.functionbox {
    background-color: #f0f0f0;
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	padding: 3px;
	margin: 1px 1px 10px 1px;
}

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	padding: 3px;
	margin: 1px 1px 10px 1px;
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}

/* normal (white) background */
.rowNormal {
    background-color: #ffffff;
 }

/* alternate (pale yellow) background */
.rowAlternate {
    background-color: #f7f7f7;
}

/* used in the list attachments table */
.rowAlternateNoBottomColor {
    background-color: #f7f7f7;
}

.rowAlternateNoBottomNoColor {
}

.rowAlternateNoBottomColor td {
    border-bottom: 0px;
}

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}

/* row highlight (grey) background */
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}

TD.greenbar {FONT-SIZE: 2px; BACKGROUND: #00df00; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}
TD.redbar {FONT-SIZE: 2px; BACKGROUND: #df0000; BORDER: 1px solid #9c9c9c; PADDING: 0px; }
TD.darkredbar {FONT-SIZE: 2px; BACKGROUND: #af0000; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}

TR.testpassed {FONT-SIZE: 2px; BACKGROUND: #ddffdd; PADDING: 0px; }
TR.testfailed {FONT-SIZE: 2px; BACKGROUND: #ffdddd; PADDING: 0px; }

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}

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}

td.noformatting {
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    border-style: none;
    text-align: center;
	padding: 0px;
}

.commentblock {
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}

/*
 * Divs displaying the license information, if necessary.
 */
.license-eval, .license-none, .license-nonprofit {
    border-top: 1px solid #bbbbbb;
    text-align: center;
    font-size: 10px;
    font-family: Verdana, Arial, Helvetica, sans-serif;
}

.license-eval, .license-none {
    background-color: #ffcccc;
}

.license-eval b, .license-none b {
    color: #990000
}

.license-nonprofit {
    background-color: #ffffff;
}

/*
 * The shadow at the bottom of the page between the main content and the
 * "powered by" section.
 */
.bottomshadow {
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    background-image: url("$req.contextPath/images/border/border_bottom.gif");
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}

/*
 * Styling of the operations box
 */
.navmenu .operations li, .navmenu .operations ul {
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    margin-left: 0;
    padding-left: 0;
}

.navmenu .operations ul {
    margin-bottom: 9px;
}

.navmenu .label {
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}

/*
 * Styling of ops as a toolbar
 */
.toolbar div {
    display: none;
}

.toolbar .label {
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}

.toolbar .operations {
    display: block;
}

.toolbar .operations ul {
    display: inline;
    list-style: none;
    margin-left: 10px;
    padding-left: 0;
}

.toolbar .operations li {
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    display: inline;
}

/* list page navigational tabs */
#foldertab {
padding: 3px 0px 3px 8px;
margin-left: 0;
border-bottom: 1px solid #3c78b5;
font: bold 11px Verdana, sans-serif;
}

#foldertab li {
list-style: none;
margin: 0;
display: inline;
}

#foldertab li a {
padding: 3px 0.5em;
margin-left: 3px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
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<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/DIRxSRVx11">DIRxSRVx11</a>
:
            <a href="http://cwiki.apache.org/confluence/display/DIRxSRVx11/1.2.+Interceptors">1.2.
Interceptors</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/DIRxSRVx11/1.2.+Interceptors">1.2.
Interceptors</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~elecharny">Emmanuel
Lécharny</a>
            <span class="smallfont">(Dec 05, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=55218&originalVersion=4&revisedVersion=5">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><style type='text/css'>/*<![CDATA[*/
table.ScrollbarTable  {border: none;padding: 3px;width: 100%;padding: 3px;margin: 0px;background-color:
#f0f0f0}
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table.ScrollbarTable td.ScrollbarNextIcon {text-align: center;width: 16px;border: none;}

/*]]>*/</style><div class="Scrollbar"><table class='ScrollbarTable'><tr><td
class='ScrollbarPrevIcon'><a href="/confluence/display/DIRxSRVx11/1.1.+Architectural+Overview"><img
border='0' align='middle' src='/confluence/images/icons/back_16.gif' width='16' height='16'></a></td><td
width='33%' class='ScrollbarPrevName'><a href="/confluence/display/DIRxSRVx11/1.1.+Architectural+Overview">1.1.
Architectural Overview</a>&nbsp;</td><td width='33%' class='ScrollbarParent'><sup><a
href="/confluence/display/DIRxSRVx11/1.+Architecture"><img border='0' align='middle'
src='/confluence/images/icons/up_16.gif' width='8' height='8'></a></sup><a
href="/confluence/display/DIRxSRVx11/1.+Architecture">1. Architecture</a></td><td
width='33%' class='ScrollbarNextName'>&nbsp;<a href="/confluence/display/DIRxSRVx11/1.3.+The+Administrative+Model">1.3.
The Administrative Model</a></td><td class='ScrollbarNextIcon'><a href="/confluence/display/DIRxSRVx11/1.3.+The+Administrative+Model"><img
border='0' align='middle' src='/confluence/images/icons/forwd_16.gif' width='16' height='16'></a></td></tr></table></div>
<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Work
in progress</b><br />
<p>This site is in the process of being reviewed and updated.</p></td></tr></table>
<h1><a name="1.2.Interceptors-Whatisit%3F"></a>What is it?</h1>

<p>The mechanism is a means for injecting and isolating orthogonal services into calls
against the nexus. The nexus is the hub used to route calls to partitions to perform CRUD
operations upon entries. By injecting these services at this level, partition implementators
need not duplicate fuctionality. Services such as authentication, authorization, schema checking,
normalization, operational attribute maintenance and more are introduced using Interceptors.
By using interceptors, partition implementors need not be concerned with these aspects and
can focus on raw CRUD operations against their backing stores what ever they may be.</p>

<h1><a name="1.2.Interceptors-Howdoesitwork%3F"></a>How does it work?</h1>

<p>Before we talk more about interceptors we must quickly cover the JNDI provider implementation
since it is somewhat related.</p>

<h2><a name="1.2.Interceptors-JNDIImplementation"></a>JNDI Implementation</h2>

<p>The JNDI implementation is composed of a set of JNDI Context implementations, a ContextFactory
implementation and a set of helper classes.</p>
<ul>
	<li>DeadContext</li>
	<li>JavaLdapSupport</li>
	<li>ServerContext</li>
	<li>ServerDirContext</li>
	<li>ServerLdapContext</li>
	<li>AbstractContextFactory</li>
	<li>CoreContextFactory</li>
	<li>ServerDirObjectFactory</li>
	<li>ServerDirStateFactory</li>
</ul>


<p>Every JNDI Context implementation in the provider holds a dedicated reference to
a <b>nexus proxy</b> object. This proxy contains all the operations that the <b>nexus</b>
contains. The proxy object is at the heart of the mechanism. We will disuss it more after
covering the rest of the JNDI provider.</p>

<p>Calls made against JNDI Contexts take relative names as arguments. These names are
relative to the distinguished name of the JNDI Context. Within the Context implementations
these relative names are transformed into absolute distinguished names. The transformed names
are used to make calls against the proxy.</p>

<p>Additional processing may occur before or after a call is made by a context on its
proxy to manage JNDI provider specific functions. One such example is the handling of Java
objects for serialization and the use of object and state factories.</p>

<h2><a name="1.2.Interceptors-Thenexusproxyobject"></a>The nexus proxy object</h2>

<p>As mentioned above, each Context that is created has a nexus proxy. The proxy maintains
a handle on the context as well.</p>
<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr>
<td class="confluenceTd"  valign="top" width="50%">
<p>The primary job of the proxy is to inject Interceptor based services. It does so
by invoking a chain of Interceptors managed by the system. Interceptors mirror the methods
that are intercepted on the nexus interface. When an intercepted method is invoked on the
proxy, the proxy pushes an Invocation object on to the InvocationStack associated with the
current executing Thread. The proxy then calls the same method on a chain of Interceptors.
The results of the call are returned after the InvocationStack is popped.</p>

<p>The InvocationStack is used to track the calls being intercepted. Invocation objects
pushed onto the stack track the context making the call to the proxy, the name of the intercepted
call and its arguments. A stack is used because in the case of Triggers, stored procedures
may be invoked which operate against the DIT using JNDI. These JNDI calls will also be intercepted.
Their Invocation object will be stacked on top of the Invocation which raised the Trigger.
This way identities and context of operations can be tracked and used by the Trigger management
system to prevent runnaway cascades or to limit the cascade depth. There are other areas besides
just triggers where this stack will serve a purpose.</p>

<p>The InterceptorChain is a container of Interceptors which has the same or analogous
methods as do Interceptors. These are for the interceptable methods. A call against the chain
invokes the first Interceptor which then usually invokes the next interceptor in the chain.
An Interceptor need not call the next interceptor however. It can raise an exception before
making the call to the next interceptor or it can completely bypass the rest of the chain
by just returning before calling the next Interceptor. Interceptors can preprocess the arguments,
or perform other tasks before they invoke the next Interceptor. They can also catch exceptions
raised by other downstream interceptors and respond to them to handle errors. Finally they
can perform post processing operations on the results of returned values from downstream Interceptors.</p>

<p>One might ask when is the call made against the actual nexus. This happens using
a special Interceptor which resides at the end of the chain. It actually makes the call against
the nexus and returns the results.</p>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>


<p>Interceptors can be seen as Servlet Filters : they can be added, removed, bypassed
either by configuration or, for embeded servers, on the fly.&nbsp;</p>
</td></tr></table>
<p>&nbsp;</p></td>
<td class="confluenceTd"  valign="top" width="50%">
<p>The folllowing picture describe the Interceptors mechanisms :&nbsp;<br/>
<img src="/confluence/download/attachments/55218/Interceptors.png" align="absmiddle" border="0"
/><br/>
&nbsp;</p></td></tr></tbody></table>


<table cellpadding='5' width='85%' cellspacing='8px' class='warningMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/forbidden.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Warning</b><br
/>
<p>This page needs to be overworked</p></td></tr></table>

<h1><a name="1.2.Interceptors-Operationhandlingwithininterceptors"></a>Operation
handling within interceptors</h1>
<p>Each operation is associated with a method in each interceptors, even if it does
nothing else than calling the next interceptor.</p>

<p>The base idea is to allow pre and post actions to be executed before and after the
call of the next interceptors :<br clear="all" />
<img src="/confluence/download/attachments/55218/Interceptorschaining.png" align="absmiddle"
border="0" /></p>

<p>Each interceptor process the <b>pre</b> action, call the next interceptor,
wait for the response, execute the <b>post</b> action, and returns. We have to
implement this chain of interceptors in a way which allows us to add new interceptors, or
new <b>pre</b> or <b>post</b> actions, without having to modify the
existing code or mechanism.&nbsp;</p>

<p>&nbsp;</p>

<h1><a name="1.2.Interceptors-BindOperation"></a>Bind Operation</h1>

<p>The <b>Bind</b>&nbsp; operation call the interceptor chain in the
<b>PartitionNexusProxy</b> class, where we can found a <b>bind</b>
method :</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> void bind(
LdapDN bindDn, <span class="code-object">byte</span>[] credentials, List mechanisms,
<span class="code-object">String</span> saslAuthId, Collection bypass ) <span
class="code-keyword">throws</span> NamingException
    {    ...
            <span class="code-keyword">this</span>.configuration.getInterceptorChain().bind(
bindDn, credentials, mechanisms, saslAuthId );    ...</pre>
</div></div>
<p>this will call the first configured interceptor from a chain which is declared in
the configuration file <b>server.xml</b>. The first interceptor is the <b>NormalizationService</b>.</p>

<p>The information which are passed are :</p>
<ul>
	<li>The <b>DN</b> used to bind</li>
	<li>The password (credentials)</li>
	<li>The list of supported mechanisms&nbsp;</li>
	<li>The SASL authent<br/>
We will often use only the two first elements.</li>
</ul>


<h2><a name="1.2.Interceptors-Normalizationinterceptor"></a>Normalization
interceptor</h2>

<p>This interceptor will just normalize the <b>DN</b> used to bind. If the
<b>DN</b> is invalid, an exception will be thrown.</p>

<p>It is the first interceptor in the chain because as we will manupulate the <b>DN</b>
through all interceptors, it is important that we normalize it as soon as possible.</p>

<p>The normalized <b>DN</b> will be stored in an special form, usefull for
internal comparizons. This operation can be costly, but as the <b>DN</b> has already
been parsed, this is quite efficient.</p>

<p>We can call the next interceptor :</p>

<h2><a name="1.2.Interceptors-Authenticationinterceptor"></a>Authentication
interceptor</h2>

<p>We must check that this bind request is valid, that is the <b>DN</b>
and the associated password are known by the server. We have two cases :</p>
<ol>
	<li>The user have already been authenticated</li>
	<li>This is the first time this user try to bind</li>
</ol>


<blockquote>
<p>&nbsp;What we call <em>user</em> is the <b>DN</b> of
a known entry stored in the server.</p></blockquote>
<p>In the first case, we will have to search the password in the backend, and this will
be a <b>lookup</b> operation, which will be applied through another chain of interceptors.</p>

<p>Let's assume we are in the second case, because if we are in the first case, we will
have to ask the backend about the entry which <b>DN</b> is equal to the one we
received, to get its associated password, thus callaing a specific chain of interceptors (<b>FINAL_INTERCEPTOR</b>).</p>

<p>The password is compared using the given mechanism (which should be <b>simple</b>
on a new server), and if it matches, we create a <b><em>principal</em></b>
object which will be stored in the connection context for future usage.</p>

<p>We are done with the <b>bind</b> operation.</p>

<h1><a name="1.2.Interceptors-%26nbsp%3BAddoperation"></a>&nbsp;Add
operation</h1>

<p>An <b>add</b> operation is more complex. What we need to do is to check
if the current user has enough right to add an entry, and that the entry can be added.</p>

<p>A new entry is a composition of three elements :</p>
<ul>
	<li>A partition name</li>
	<li>A path from this partition</li>
	<li>An entry name</li>
</ul>


<p>For instance, when adding an entry which <b>DN</b> is <em>cn=acme,
ou=users, ou=system</em> , we will have :</p>
<ul>
	<li>Partition = "<em>ou=system</em>"</li>
	<li>Path = "<em>ou=users, ou=system"</em></li>
	<li>Entry name = "<em>cn=acme</em>"<br/>
The two first elements must exist in the base. We can't add an entry in an not existing partition,
and we can't add an entry which path is not existing.</li>
</ul>
</div>


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