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Group based permissions - Authentication and Authorization Service

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Prefer using OpenID Connect over SAML </a> </li> <li class="md-nav__item"> <a href="#2-avoid-saving-the-id-token-as-a-cookie" class="md-nav__link"> 2. Avoid saving the ID Token as a cookie </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../sso-registration/" class="md-nav__link"> Registering your application to SSO </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_7" type="checkbox" id="__nav_3_7" > <label class="md-nav__link" for="__nav_3_7"> SAML <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="SAML" data-md-level="2"> <label class="md-nav__title" for="__nav_3_7"> <span class="md-nav__icon md-icon"></span> SAML </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../user-documentation/saml/saml/" class="md-nav__link"> About </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/saml/config/" class="md-nav__link"> Configuration </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/saml/shibboleth-integration/" class="md-nav__link"> Shibboleth integration </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/saml/shibboleth-migration/" class="md-nav__link"> Shibboleth migration from the old SSO </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_8" type="checkbox" id="__nav_3_8" > <label class="md-nav__link" for="__nav_3_8"> OIDC <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="OIDC" data-md-level="2"> <label class="md-nav__title" for="__nav_3_8"> <span class="md-nav__icon md-icon"></span> OIDC </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../user-documentation/oidc/oidc/" class="md-nav__link"> About </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/token-requests/" class="md-nav__link"> Token Requests </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/scopes/" class="md-nav__link"> Scopes </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/config/" class="md-nav__link"> OIDC configuration and usage </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/apache/" class="md-nav__link"> Apache configuration </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/securing-apis/" class="md-nav__link"> Securing APIs </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/api-access/" class="md-nav__link"> API Access </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/exchange-for-api/" class="md-nav__link"> Token Exchange </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/device-code/" class="md-nav__link"> Device Code </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/oidc/libraries/" class="md-nav__link"> Suggested libraries </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../examples/" class="md-nav__link"> Examples </a> </li> <li class="md-nav__item"> <a href="../qa-environment/" class="md-nav__link"> QA Environment </a> </li> <li class="md-nav__item"> <a href="../command-line-tools/" class="md-nav__link"> Command line tools </a> </li> <li class="md-nav__item"> <a href="../../user-documentation/faqs/" class="md-nav__link"> FAQs </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_4" type="checkbox" id="__nav_4" > <label class="md-nav__link" for="__nav_4"> Group Management System <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Group Management System" data-md-level="1"> <label class="md-nav__title" for="__nav_4"> <span class="md-nav__icon md-icon"></span> Group Management System </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../roadmap/group-missing-features/" class="md-nav__link"> Missing features </a> </li> <li class="md-nav__item"> <a href="../../groups/special-groups/" class="md-nav__link"> Special groups </a> </li> <li class="md-nav__item"> <a href="../../groups/dynamic-guidance/" class="md-nav__link"> Dynamic groups </a> </li> <li class="md-nav__item"> <a href="../../groups/csv/" class="md-nav__link"> CSV </a> </li> <li class="md-nav__item"> <a href="../../groups/e-groups-to-gms-sync-scenario/" class="md-nav__link"> E-Groups to GMS transition </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5" type="checkbox" id="__nav_5" > <label class="md-nav__link" for="__nav_5"> Resources lifecycle and eligibility <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Resources lifecycle and eligibility" data-md-level="1"> <label class="md-nav__title" for="__nav_5"> <span class="md-nav__icon md-icon"></span> Resources lifecycle and eligibility </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../resources/resources/" class="md-nav__link"> Introduction </a> </li> <li class="md-nav__item"> <a href="../../resources/resource-lifecycle-integration/" class="md-nav__link"> Integration </a> </li> <li class="md-nav__item"> <a href="../../resources/resource-states/" class="md-nav__link"> Resource States </a> </li> <li class="md-nav__item"> <a href="../../resources/push-rest-api/" class="md-nav__link"> Resources REST API (push) </a> </li> <li class="md-nav__item"> <a href="../../resources/policies/" class="md-nav__link"> Custom Resource Policies </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" > <label class="md-nav__link" for="__nav_6"> Documents <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Documents" data-md-level="1"> <label class="md-nav__title" for="__nav_6"> <span class="md-nav__icon md-icon"></span> Documents </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../documents/why-keycloak/" class="md-nav__link"> Why Keycloak </a> </li> <li class="md-nav__item"> <a href="../../documents/presentations/" class="md-nav__link"> Presentations </a> </li> <li class="md-nav__item"> <a href="../../documents/our-contributions/" class="md-nav__link"> Our contributions to Keycloak </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" > <label class="md-nav__link" for="__nav_7"> Services <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Services" data-md-level="1"> <label class="md-nav__title" for="__nav_7"> <span class="md-nav__icon md-icon"></span> Services </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../services/" class="md-nav__link"> Overview </a> </li> <li class="md-nav__item"> <a href="../../services/instances/" class="md-nav__link"> Links to instances </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7_3" type="checkbox" id="__nav_7_3" > <label class="md-nav__link" for="__nav_7_3"> Authorization Service API <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Authorization Service API" data-md-level="2"> <label class="md-nav__title" for="__nav_7_3"> <span class="md-nav__icon md-icon"></span> Authorization Service API </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../authzsvc/overview/" class="md-nav__link"> Overview </a> </li> <li class="md-nav__item"> <a href="../../authzsvc/managed-applications/" class="md-nav__link"> Managing applications for other users </a> </li> <li class="md-nav__item"> <a href="../../authzsvc/roles/" class="md-nav__link"> Role definitions </a> </li> <li class="md-nav__item"> <a href="../../authzsvc/model/" class="md-nav__link"> Model (attributes) </a> </li> <li class="md-nav__item"> <a href="../../authzsvc/examples/" class="md-nav__link"> Examples </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_8" type="checkbox" id="__nav_8" > <label class="md-nav__link" for="__nav_8"> Help <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Help" data-md-level="1"> <label class="md-nav__title" for="__nav_8"> <span class="md-nav__icon md-icon"></span> Help </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../trouble-shooting/edugain-authentication/" class="md-nav__link"> eduGAIN Authentication </a> </li> <li class="md-nav__item"> <a href="../../trouble-shooting/2fa-tips/" class="md-nav__link"> 2FA Tips </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../../privacy-notice/" class="md-nav__link"> Privacy notice </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_10" type="checkbox" id="__nav_10" > <label class="md-nav__link" for="__nav_10"> Migration notes <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" aria-label="Migration notes" data-md-level="1"> <label class="md-nav__title" for="__nav_10"> <span class="md-nav__icon md-icon"></span> Migration notes </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../migrations/keycloak24/" class="md-nav__link"> Keycloak 24 </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../../contact/" class="md-nav__link"> Contact </a> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner"> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#the-groups-field" class="md-nav__link"> The groups field </a> </li> <li class="md-nav__item"> <a href="#recommendations" class="md-nav__link"> Recommendations </a> <nav class="md-nav" aria-label="Recommendations"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#1-prefer-using-openid-connect-over-saml" class="md-nav__link"> 1. Prefer using OpenID Connect over SAML </a> </li> <li class="md-nav__item"> <a href="#2-avoid-saving-the-id-token-as-a-cookie" class="md-nav__link"> 2. Avoid saving the ID Token as a cookie </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset"> <a href="https://gitlab.cern.ch/authzsvc/docs/authzsvc-docs/-/blob/master/docs/applications/group-based-permissions.md" title="Edit this page" class="md-content__button md-icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25Z"/></svg> </a> <h1 id="group-based-permissions">Group based permissions</h1> <div class="admonition warning"> <p class="admonition-title">Warning</p> <p>This document should never be followed as the default way of defining application permissions. For most cases we recommend using the default <a href="../role-based-permissions/">role based permissions</a>, which doesn't have any privacy implications and doesn't need an official approval for setting it up.</p> </div> <p>Most applications can be defined with a well defined set of roles (e.g. <em>user</em>, <em>administrator</em>, <em>help-desk</em>), but this approach could be very limited for other applications with more fine-grained permissions. For example, an application containing wiki pages could need to define <em>read</em>, <em>edit</em> and <em>administrate</em> permissions for each page. With the role-based approach, each page would have to be a separate application with roles such as <em>reader</em>, <em>editor</em> and <em>administrator</em> for them. If this wiki contains just a few pages it is possible to set this up, but if we expect thousands of pages that can be dynamically created we can see that it wouldn't scale easily.</p> <p>We accept that, only in those cases, the application needs to get the group memberships of its users to manage their access rights according to the application's own permissions scheme. We will configure your application registration so that your application will be able to get these groups easily by reading them from the authentication response or OpenID Connect token.</p> <p>In order to set up group based permissions, these are the steps that you will have to follow:</p> <ol> <li>Create a Service Now request using the following form: <a href="https://cern.service-now.com/service-portal?id=sc_cat_item&amp;name=access-groupinfo-sso&amp;fe=authentication">Request Form</a>.</li> <li>Once the request is approved, configure your application to read the <code>groups</code> claim or field.</li> </ol> <h2 id="the-groups-field">The <code>groups</code> field</h2> <ul> <li> <p>OpenID Connect: It will be included in the <strong>ID Token</strong> (not the Access Token) and the UserInfo endpoint in the <code>groups</code> claim. Remember that the application has to use OpenID Connect (not just OAuth2) in order to include the ID Token in the response, i.e. it has to include the <code>openid</code> scope.</p> </li> <li> <p>SAML: It will be included in your authentication response as a multivalued attribute.</p> </li> </ul> <div class="highlight"><pre><span></span><code> &lt;saml:Attribute FriendlyName=&quot;Group&quot; Name=&quot;http://schemas.xmlsoap.org/claims/Group&quot; NameFormat=&quot;urn:oasis:names:tc:SAML:2.0:attrname-format:uri&quot;&gt; &lt;saml:AttributeValue xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot; xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot; xsi:type=&quot;xs:string&quot;&gt;my-group &lt;/saml:AttributeValue&gt; &lt;/saml:Attribute&gt; </code></pre></div> <h2 id="recommendations">Recommendations</h2> <p>Some users are members of a very large number of groups, making the token or authentication response size much larger than the usual size. Your application should handle tokens in a different way accordingly.</p> <h3 id="1-prefer-using-openid-connect-over-saml">1. Prefer using OpenID Connect over SAML</h3> <p>SAML responses are limited to the HTTP header size limit, which is about 8KB. This limit can be easily reached with users that contain over 1000 groups. In OpenID Connect the token is always sent in the HTTP body, which has no size limit.</p> <h3 id="2-avoid-saving-the-id-token-as-a-cookie">2. Avoid saving the ID Token as a cookie</h3> <p>When using OpenID Connect, a common solution for keeping the user session is saving the ID Token or Access Token as a cookie. The ID Token will very likely be too large for the maximum size of a cookie, which could be as low as 4096 bytes depending on the web browser. Instead of that, you can save the Access Token or generate your own application session cookies.</p> </article> </div> </div> </main> <footer class="md-footer"> <nav class="md-footer__inner md-grid" aria-label="Footer" > <a href="../role-based-permissions/" class="md-footer__link md-footer__link--prev" aria-label="Previous: Role based permissions (recommended)" rel="prev"> <div class="md-footer__button md-icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class="md-footer__title"> <div class="md-ellipsis"> <span class="md-footer__direction"> Previous </span> Role based permissions (recommended) </div> </div> </a> <a href="../sso-registration/" class="md-footer__link md-footer__link--next" aria-label="Next: Registering your application to SSO" rel="next"> <div class="md-footer__title"> <div class="md-ellipsis"> <span class="md-footer__direction"> Next </span> Registering your application to SSO </div> </div> <div class="md-footer__button md-icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class="md-copyright"> Made with <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> Material for MkDocs </a> </div> </div> </div> </footer> </div> <div class="md-dialog" data-md-component="dialog"> <div class="md-dialog__inner md-typeset"></div> </div> <script id="__config" type="application/json">{"base": "../..", "features": [], "search": "../../assets/javascripts/workers/search.5bf1dace.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version.title": "Select version"}}</script> <script src="../../assets/javascripts/bundle.37e9125f.min.js"></script> </body> </html>

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