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From conflue...@apache.org
Subject [CONF] Apache Sling: Authentication Initiation (page edited)
Date Thu, 23 Apr 2009 07:58:00 GMT
<html>
<head>
    <base href="http://cwiki.apache.org/confluence" />
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    <!--
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	font-family: Verdana, arial, sans-serif;
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	line-height: 16px;
	color: #000000;
	font-weight: normal;
}
#PageContent {
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/*
** when this stylesheet is used for the Tiny MCE Wysiwyg editor's edit area, we can't
** use an id=PageContent or class=wiki-content, so we must
** set the body style to that used for PageContent, and p to that used for wiki-content.
*/

body {
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ul, ol {
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pre {
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    margin-left: 15px;
    margin-bottom: 5px;
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    text-align: left;
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HR {
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}

A:link, A:visited, A:active, A:hover {
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h1 A:link, h1 A:visited, h1 A:active {
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h1 A:hover {
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}
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.spacenametitle a:visited {
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}*/

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h4.search {
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}
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}

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.navItemOver { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #003366;
cursor: hand; voice-family: '\'}\''; voice-family:inherit; cursor: pointer;}
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.navItemOver a:visited { color: #ffffff; background-color:#003366; text-decoration: none;
}
.navItemOver a:hover { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItem { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #3c78b5;
}
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.navItem a:visited { color: #ffffff; text-decoration: none; }

div.padded { padding: 4px; }
div.thickPadded { padding: 10px; }
h3.macrolibrariestitle {
    margin: 0px 0px 0px 0px;
}

div.centered { text-align: center; margin: 10px; }
div.centered table {margin: 0px auto; text-align: left; }

.tableview table {
    margin: 0;
}

.tableview th {
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    color: #003366;
    font-size: 12px;
    padding: 5px 0px 0px 5px;
    border-bottom: 2px solid #3c78b5;
}
.tableview td {
    text-align: left;
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    border-style: solid;
    margin: 0;
    padding: 4px 10px 4px 5px;
}

.grid {
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    border-collapse: collapse;
}
.grid th  {
    border: 1px solid #ccc;
    padding: 2px 4px 2px 4px;
    background: #f0f0f0;
    text-align: center;
}
.grid td  {
    border: 1px solid #ccc;
    padding: 3px 4px 3px 4px;
}
.gridHover {
	background-color: #f9f9f9;
}

td.infocell {
    background-color: #f0f0f0;
}
.label {
	font-weight: bold;
	color: #003366;
}

label {
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	color: #003366;
}

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}

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    border: 1px solid #c00;
    padding: 5px;
    margin: 5px;
}

.errorMessage {
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}

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	background-color: #dfd;
}

.successBox {
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    padding: 5px;
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}

blockquote {
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	padding-right: 10px;
	margin-left: 5px;
	margin-right: 0px;
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}

table.confluenceTable
{
    margin: 5px;
    border-collapse: collapse;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable td.confluenceTd
{
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    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

td.confluenceTd
{
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}

th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

DIV.small {
	font-size: 9px;
}

H1.pagename {
	margin-top: 0px;
}

IMG.inline  {}

.loginform {
    margin: 5px;
    border: 1px solid #ccc;
}

/* The text how the "This is a preview" comment should be shown. */
.previewnote { text-align: center;
                font-size: 11px;
                    color: red; }

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

/* How the system messages should be shown (DisplayMessage.jsp) */
.messagecontent { background: #E0E0E0; }

/* How the "This page has been modified..." -comment should be shown. */
.conflictnote { }

.createlink {
    color: maroon;
}
a.createlink {
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}
.templateparameter {
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    color: darkblue;
}

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	border-left: 4px solid darkred;
}
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}
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}
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}
.diffremovedchars {
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    text-decoration: line-through;
    font-weight:bolder;
}

.greybackground {
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}

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

.borderedGreyBox {
    border: 1px solid #cccccc;
    background-color: #f0f0f0;
    padding: 10px;
}

.greyboxfilled {
 	border: 1px solid #ddd;
    background: #f0f0f0;
    padding: 3px;
	margin: 1px 1px 10px 1px;
}

.navBackgroundBox {
    padding: 5px 5px 5px 5px;
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	font-weight: bold;
	font-family: Arial, sans-serif;
	color: white;
    background: #3c78b5;
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}

.previewBoxTop {
	background-color: #f0f0f0;
    border-width: 1px 1px 0px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 5px 0px 0px 0px;
    text-align: center;
}
.previewContent {
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	border-width: 0px 1px 0px 1px;
	border-style: solid;
	padding: 10px;
	margin: 0px;
}
.previewBoxBottom {
	background-color: #f0f0f0;
    border-width: 0px 1px 1px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 0px 0px 5px 0px;
    text-align: center;
}

.functionbox {
    background-color: #f0f0f0;
 	border: 1px solid #3c78b5;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

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

.search-highlight {
    background-color: #ffffcc;
}

/* 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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    border-bottom: 0px;
}

/* 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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    border-collapse: collapse;
}

.toolbar td  {
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    padding: 2px 2px 2px 2px;
    color: #ccc;
}

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

.commentblock {
    margin: 12px 0 12px 0;
}

/*
 * 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 {
    height: 12px;
    background-image: url("$req.contextPath/images/border/border_bottom.gif");
    background-repeat: repeat-x;
}

/*
 * 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 {
    font-weight: inherit;
}

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

.toolbar .label {
    display: none;
}

.toolbar .operations {
    display: block;
}

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

.toolbar .operations li {
    list-style: none;
    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/SLING">SLING</a>
:
            <a href="http://cwiki.apache.org/confluence/display/SLING/Authentication+Initiation">Authentication
Initiation</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/SLING/Authentication+Initiation">Authentication
Initiation</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~fmeschbe">Felix
Meschberger</a>
            <span class="smallfont">(Apr 23, 2009)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=115375&originalVersion=3&revisedVersion=4">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="AuthenticationInitiation-AuthenticationInitiation"></a>Authentication
Initiation</h1>



<p>Status: DRAFT<br/>
Created: 21. April 2009<br/>
Author: fmeschbe<br/>
JIRA: <span class="nobr"><a href="https://issues.apache.org/jira/browse/SLING-938"
title="Visit page outside Confluence" rel="nofollow">SLING-938<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span>, <span class="nobr"><a href="https://issues.apache.org/jira/browse/SLING-939"
title="Visit page outside Confluence" rel="nofollow">SLING-939<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span><br/>
References: <span class="nobr"><a href="http://www.mail-archive.com/sling-dev@incubator.apache.org/msg09620.html"
title="Visit page outside Confluence" rel="nofollow">Sling Dev: Refining the authentication
process<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7"
width="7" align="absmiddle" alt="" border="0"/></sup></a></span><br/>
Updated: -</p>


<div>
<ul>
  <li><a href='#AuthenticationInitiation-CurrentState'>Current State</a></li>
  <li><a href='#AuthenticationInitiation-NonGoals'>Non Goals</a>
<ul>
  <li><a href='#AuthenticationInitiation-Logout'>Logout</a></li>
  <li><a href='#AuthenticationInitiation-NonJCRcentricAuthenticationInfo'>Non-JCR-centric
AuthenticationInfo</a></li>
</ul></li>
  <li><a href='#AuthenticationInitiation-APIextension'>API extension</a></li>
  <li><a href='#AuthenticationInitiation-Generalizesling%3AauthRequestLogin'>Generalize
sling:authRequestLogin</a></li>
  <li><a href='#AuthenticationInitiation-HTTPBasicAuthenticationChanges'>HTTP
Basic Authentication Changes</a></li>
</ul></div>


<h2><a name="AuthenticationInitiation-CurrentState"></a>Current State</h2>

<p>Authentication processing is currently implemented using the following components:</p>

<ul>
	<li>The <tt>SlingAuthenticator</tt> class is managed by the <tt>SlingMainServlet</tt>
and is used as a backend for the OSGi <tt>HttpContext.handleSecurity</tt> method.</li>
	<li>The <tt>AuthenticationHandler</tt> interface is a service interface,
which may be used to extend authentication protocols. Currently Sling includes two implementations
of this interface for the standard HTTP Basic authentication and for OpenID authentication.</li>
	<li>To initiate a login one or more servlets or scripts have to be written, which create
requests suitable for authentication. For example the <tt>LoginServlet</tt> of
the <tt>org.apache.sling.httpauth</tt> bundle uses an HTML form and Ajax requests
to setup the HTTP BASIC authentication.</li>
	<li>The HTTP Basic authentication handler supports a <tt>sling:authRequestLogin</tt>
parameter to have a client request ask for authentication.</li>
</ul>


<p>This approach currently has two major issues:</p>

<ol>
	<li>Initiating authentication can only be done by the user requesting the login servlet
or script. For example to initiate HTTP Basic authentication using the <tt>org.apache.sling.httpauth</tt>
bundle, the user has to actively request the <tt>/system/sling/login.html</tt>
page.</li>
	<li>There is a conceptual break between login initiation (or form rendering) and authentication
handling.</li>
	<li>The <tt>sling:authRequestLogin</tt> parameter is only obeyed if HTTP
Basic authentication is used and the handler is deemed responsible for the request.</li>
</ol>



<p>To solve these issues, I suggest we add a new API, which may be used to force the
initiation of authentication from servlets or scripts. This new API would be implemented such,
that a <tt>AuthenticationHandler</tt> is selected based on some path (just like
for the actual authentication) and the <tt>AuthenticationHandler.requestAuthentication</tt>
method is called.</p>

<p>Currently the <tt>AuthenticationHandler.requestAuthentication</tt> method
is only called if an authentication request, which has been initiated from the client side
for example by submitting a form, failed and must be reissued. With the new approach, this
method may also be called to initiate authentication.</p>


<h2><a name="AuthenticationInitiation-NonGoals"></a>Non Goals</h2>

<h3><a name="AuthenticationInitiation-Logout"></a>Logout</h3>

<p>This concept is not about request "logout". To complement the authentication initiation
process to enable rendering authentication handler agnostic login buttons in some GUIs it
would likewise be interesting to provide a generic logout mechanism which allows rendering
a authentication handler agnostic logout button.</p>

<p>Currently, the only way to implement a "logout" is to initiate another authentication
process. This is of course the only way to "logout" when using plain HTTP Basic authentication.
For other authentication schemes like OpenID or Single Sign-On solutions, the situation may
be different and an actual "logou" mechanism may be existing.</p>


<h3><a name="AuthenticationInitiation-NonJCRcentricAuthenticationInfo"></a>Non-JCR-centric
AuthenticationInfo</h3>

<p>This concept is not about modifying the <tt>AuthenticationInfo</tt> class,
which is used by the <tt>AuthenticationHandler</tt> interface to give back the
login credentials for the authenticator to actually log in. This is rather the issue of the
general refactoring of the <a href="/confluence/display/SLING/Add+ResourceResolverFactory+Service+Interface"
title="Add ResourceResolverFactory Service Interface"><tt>ResourceResolver</tt>
access</a>.</p>



<h2><a name="AuthenticationInitiation-APIextension"></a>API extension</h2>

<p>A new <tt>Authenticator</tt> interface is defined and exported in the
<tt>org.apache.sling.engine</tt> bundle :</p>

<div class="code"><div class="codeHeader"><b>org.apache.sling.engine.auth.Authenticator</b></div><div
class="codeContent">
<pre class="code-java">/**
 * The &lt;code&gt;Authenticator&lt;/code&gt; <span class="code-keyword">interface</span>
defines the service <span class="code-keyword">interface</span> of the
 * authenticator used by the Sling engine. This service provides a method to
 * find an {@link AuthenticationHandler} and call its
 * {@link AuthenticationHandler#requestAuthentication(HttpServletRequest, HttpServletResponse)}
 * method.
 * &lt;p&gt;
 * This <span class="code-keyword">interface</span> is not intended to be implemented
by applications but may be
 * used to initiate the authentication process form a request processing servlet
 * or script.
 * 
 * @since 2.0.4
 */
<span class="code-keyword">public</span> <span class="code-keyword">interface</span>
Authenticator {

    /**
     * Finds an {@link AuthenticationHandler} <span class="code-keyword">for</span>
the given request and call its
     * {@link AuthenticationHandler#requestAuthentication(HttpServletRequest, HttpServletResponse)}
     * method to initiate an authentication process with the client.
     * &lt;p&gt;
     * This method must be called on an uncommitted response since the
     * implementation may want to reset the response to start the authentication
     * process with a clean response. If the response is already committed an
     * &lt;code&gt;IllegalStateException&lt;/code&gt; is thrown.
     * &lt;p&gt;
     * After <span class="code-keyword">this</span> method has finished, request
processing should be terminated
     * and the response be considered committed and finished.
     * 
     * @param request The object representing the client request.
     * @param response The object representing the response to the client.
     * @<span class="code-keyword">throws</span> IllegalStateException If the
response has already been committed.
     */
    <span class="code-keyword">public</span> void requestAuthentication(HttpServletRequest
request,
            HttpServletResponse response);

}</pre>
</div></div>

<p>This interface is implemented by the <tt>SlingAuthenticator</tt> class
which is also registered under this service interface. The <tt>SlingAuthenticator</tt>
implementation in fact already has an implementation of this method, which finds an <tt>AuthenticationHandler</tt>
for the request and calls its <tt>requestAuthentication</tt> method.</p>


<h2><a name="AuthenticationInitiation-Generalizesling%3AauthRequestLogin"></a>Generalize
sling:authRequestLogin</h2>

<p>The request parameter <tt>sling:authRequestLogin</tt> should be generalized
and supported by the <tt>SlingAuthenticator</tt>: If none of the registered authentication
handlers is able to extract credentials this parameter should cause the authenticator to call
<tt>Authenticator.requestAuthentication</tt> method to initiate a login process.</p>


<h2><a name="AuthenticationInitiation-HTTPBasicAuthenticationChanges"></a>HTTP
Basic Authentication Changes</h2>

<p>The implementation of the HTTP Basic Authentication bundle <tt>org.apache.sling.httpauth</tt>
is modified as follows:</p>

<ul>
	<li>The <tt>AuthorizationHeaderAuthenticationHandler</tt> is modified to
render the login form when the <tt>requestAuthentication</tt> method is called.</li>
	<li>The <tt>LoginServlet</tt> is modified to just call the <tt>Authenticator.requestAuthentication</tt>
method instead of rendering the form itself.</li>
</ul>
</div>


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