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From "Chetan Mehrotra (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache Sling > Solving the Authentication Handler Credential Validation Problem
Date Mon, 13 Jan 2014 05:32:00 GMT
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                                                            <a href="    https://cwiki.apache.org/confluence/display/~chetanm
" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Chetan
Mehrotra</a> edited the page:
                                                        </div> </td>
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                                                    <td valign="top" style="font-size:
13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height:
20px; margin: 0; padding: 0"> <a href="https://cwiki.apache.org/confluence/display/SLING/Solving+the+Authentication+Handler+Credential+Validation+Problem"
style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:page-icon"
alt="" style="border: 0; padding: 0 5px 0 0; text-align: left; vertical-align: middle" />
<strong style="font-size:16px;line-height:20px;vertical-align:top;">Solving the Authentication
Handler Credential Validation Problem</strong> </a> </h2> </td>
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                                                    <h1 id="SolvingtheAuthenticationHandlerCredentialValidationProblem-SolvingtheAuthenticationHandlerCredentialValidationProblem"
class="diff-block-context">Solving the Authentication Handler Credential Validation Problem</h1>
                                                    <table class="diff-macro diff-html-changed
diff-block-target" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px
1px;padding: 0 2px 2px;width: 100%;">
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                                                            <tr>
                                                                <th class="diff-macro-title"
style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="diff-html-changed" id="changed-diff-0" style="background-color:
#d6f0ff;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height:
20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/images/icons/macrobrowser/dropdown/excerpt.png"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Excerpt</span></th>
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                                                                <td class="diff-macro-properties"
style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding:
0; border: 1px solid #dddddd;; font-size: 13px">
                                                                    <table>
                                                                        <tbody>
                                                                            <tr>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"><span
class="diff-html-changed" style="background-color: #d6f0ff;">hidden</span></td>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"><span
class="diff-html-changed" style="background-color: #d6f0ff;">true</span></td>
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                                                                    </table> </td>
                                                            </tr>
                                                        </tbody>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-body"
style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<p style="font-size: 13px"> <span class="diff-html-changed" style="background-color:
#d6f0ff;">Define a mechanism to allow an Authentication Handler to validate the user's
identity and signal that to the </span><code style="font-size: 13px"><span
class="diff-html-changed" style="background-color: #d6f0ff;">ResourceResolverFactory</span></code><span
class="diff-html-changed" style="background-color: #d6f0ff;"> in the authentication information.(DRAFT)</span>
</p> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-block-context" style="font-size:
13px">Status: DRAFT<br /> Created: 27. September 2013<br /> Author: fmeschbe<br
/> JIRA: <a href="https://issues.apache.org/jira/browse/SLING-3179" class="external-link"
rel="nofollow" style="color: #326ca6; text-decoration: none">Implement solution to the
Authentication Handler Credential Validation Problem</a>, <a href="https://issues.apache.org/jira/browse/SLING-2762"
class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">AbstractSlingRepository#login
violates JCR spec</a> <br /> References: –<br /> Updated: –</p>
                                                    <p class="diff-block-target" style="font-size:
13px"> </p>
                                                    <table class="diff-macro bodyless diff-html-changed"
style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px
2px;width: 100%;margin: 5px 0; padding: 0; width: auto;">
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style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="diff-html-changed" id="changed-diff-1" style="background-color:
#d6f0ff;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height:
20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/images/icons/macrobrowser/dropdown/toc.png"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Table of Contents</span></th>
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style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding:
0; border: 1px solid #dddddd;; font-size: 13px">
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#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"><span
class="diff-html-changed" style="background-color: #d6f0ff;">minLevel</span></td>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"><span
class="diff-html-changed" style="background-color: #d6f0ff;">2</span></td>
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                                                    <p style="font-size: 13px"></p>
                                                    <h2 id="SolvingtheAuthenticationHandlerCredentialValidationProblem-Problem"
class="diff-block-context">Problem</h2>
                                                    <p class="diff-block-context" style="font-size:
13px">There does not currently exist a good and transparent way for an Authentication Handler
to signal to the <code style="font-size: 13px">ResourceResovlerFactory</code>,
that the identity of a user has been established and validated and that no further checks
are required. For example an SSO authentication handler will get the identity of a user provided
by the SSO handler or an OAuth 2 authentication handler proves the identity of the user by
with the help of the OAuth 2 provider.</p>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size:
13px">A new predefined property of the <code style="font-size: 13px">AuthenticationInfo</code>
map is defined which can be set by the authentication handler to indicate that the user's
identity has been verified and can be guaranteed:</p>
                                                    <table class="diff-macro diff-block-target"
style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px
2px;width: 100%;">
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style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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0; border: 1px solid #dddddd;; font-size: 13px">
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#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"></td>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
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style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>public interface ResourceResolverFactory {
    ....
    /**
     * Name of the authentication information property used to indicate that the
     * identity of the user indicated by the {@link #USER} property has already
     * been validated by other means such as OAuth2, OpenID or similar SSO
     * functionality. As a consequence password-less access to a
     * {@link ResourceResolver} should be granted.
     * &lt;p&gt;
     * The non-empty string value of this property identifies the party having
     * validated the user's identity. It may be used by implementations of this
     * and the {@link ResourceProviderFactory} interfaces in log messages.
     * &lt;p&gt;
     * The type of this property, if present, is &lt;code&gt;String&lt;/code&gt;.
     *
     * @since 2.4 (bundle version 2.5.0)
     */
    String IDENTIFIED = &quot;user.identified&quot;;
    ....
}
</pre> </td>
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                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size:
13px">The JCR Resource Provider will check for the property and create a <code style="font-size:
13px">Subject</code> used for establishing the session's owner:</p>
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style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px
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style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
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;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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0; border: 1px solid #dddddd;; font-size: 13px">
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#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"></td>
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#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
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<pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>if (authenticationInfo.get(&quot;user.identified&quot;) != null) {

    // pre-identified user access
    final String userName = (String) authenticationInfo.get(ResourceResolverFactory.USER);
    final String identifier = (String) authenticationInfo.get(&quot;user.identified&quot;);

    log.info(&quot;getResourceProviderInternal: Logging in user {} identified by {}&quot;,
userName, identifier);
    Session tmp = null;
    try {
        tmp = session = repository.loginAdministrative(workspace);
        Authorizable auth = ((JackrabbitSession) tmp).getUserManager().getAuthorizable(userName);
        Subject s = new Subject();
        s.getPrincipals().add(auth.getPrincipal());
        session = Subject.doAs(s, new PrivilegedExceptionAction&lt;Session&gt;() {
            public Session run() throws Exception {
                return repository.login(workspace);
            }
        });
    } catch (PrivilegedActionException pae) {
        throw pae.getCause();
    } finally {
        if (tmp != null) {
            tmp.logout();
        }
    }
}
</pre> </td>
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                                                        </tbody>
                                                    </table>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-target" style="font-size:
13px">One approach to mitigate this problem would be to leverage the <a href="/confluence/display/SLING/Solving+the+Authentication+Handler+Credential+Validation+Problem"
style="color: #326ca6; text-decoration: none"><code style="font-size: 13px"><span
class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">ServiceUserMapper</span></code></a><span
class="diff-html-changed" style="background-color: #d6f0ff;"> </span>service which
is also used in the context of the service authentication mechanism: a sub service name <code
style="font-size: 13px">user.identified</code> is defined and each consumer of this
mechanism must have a user mapping for this subservice to the mock user <code style="font-size:
13px">*</code>.</p>
                                                    <p class="diff-block-context" style="font-size:
13px">This way, the JCR Resource Provider sketched above would add this check:</p>
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style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px
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<pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>if (authenticationInfo.get(&quot;user.identified&quot;) != null) {

    if (!&quot;*&quot;.equals(serviceUserMapper.getServiceUserID(callingBundle, &quot;user.identified&quot;)))
{
        log.info(&quot;Missing privilege to use pre-authenticated login&quot;);
        throw new LoginException();
    }

    ...
}
</pre> </td>
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                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size:
13px">So the Abstract Sling Repository implementation of the <code style="font-size:
13px">login(String, String)</code> method must be fixed along these lines:</p>
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2px;width: 100%;">
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style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding:
0; border: 1px solid #dddddd;; font-size: 13px">
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                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"></td>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
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                                                                <td class="diff-macro-body"
style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>if (credentials == null) {
    if (Subject.getSubject(AccessController.getContext()) != null) {
        return getRepository().login(null, workspace);
    } else {
        // TODO: getAnonCredentials(this.anonUser) should not be used for anonymous access
        return getRepository().login(new GuestCredentials(), workspace);
    }
} else {
    return getRepository().login(credentials, workspace);
}
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