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class="sidemenu sidemenu-off"> <div class="social-widget"> </div>  <div id="searchform-wrap"> <form method="get" id="searchform" action="/"> <div class="oauth-search"> <i class="icon-clear-search">X</i> <input type="text" name="s" id="s" value="" /> </div> </form> </div>  <nav id="main-nav-wrap" itemscope="itemscope" itemtype="https://schema.org/SiteNavigationElement"> <ul id="main-nav" class="main-nav clearfix"><li class="page_item page-item-6 page_item_has_children current_page_ancestor"><a href="/">OAuth.com</a> <ul class='children'> <li class="page_item page-item-2"><a href="/oauth2-servers/background/">Background</a></li> <li class="page_item page-item-914"><a href="/oauth2-servers/getting-ready/" data-section="1">Getting Ready</a></li> <li class="page_item page-item-896 page_item_has_children"><a href="/oauth2-servers/accessing-data/" data-section="2">Accessing Data in an OAuth Server</a> <ul class='children'> <li class="page_item page-item-898"><a href="/oauth2-servers/accessing-data/create-an-application/" data-section="2.1">Create an Application</a></li> <li class="page_item page-item-903"><a href="/oauth2-servers/accessing-data/setting-up-the-environment/" data-section="2.2">Setting up the Environment</a></li> <li class="page_item page-item-907"><a href="/oauth2-servers/accessing-data/authorization-request/" data-section="2.3">Authorization Request</a></li> <li class="page_item page-item-910"><a href="/oauth2-servers/accessing-data/obtaining-an-access-token/" data-section="2.4">Obtaining an Access Token</a></li> <li class="page_item page-item-912"><a href="/oauth2-servers/accessing-data/making-api-requests/" data-section="4.5">Making API Requests</a></li> </ul> </li> <li class="page_item page-item-28 page_item_has_children"><a href="/oauth2-servers/signing-in-with-google/" data-section="3">Signing in with Google</a> <ul class='children'> <li class="page_item page-item-883"><a href="/oauth2-servers/signing-in-with-google/create-an-application/" data-section="3.1">Create an Application</a></li> <li class="page_item page-item-886"><a href="/oauth2-servers/signing-in-with-google/setting-up-the-environment/" data-section="3.2">Setting up the Environment</a></li> <li class="page_item page-item-888"><a href="/oauth2-servers/signing-in-with-google/authorization-request/" data-section="3.3">Authorization Request</a></li> <li class="page_item page-item-891"><a href="/oauth2-servers/signing-in-with-google/getting-an-id-token/" data-section="3.4">Getting an ID Token</a></li> <li class="page_item page-item-893"><a href="/oauth2-servers/signing-in-with-google/verifying-the-user-info/" data-section="3.5">Verifying the User Info</a></li> </ul> </li> <li class="page_item page-item-95 page_item_has_children"><a href="/oauth2-servers/server-side-apps/" data-section="4">Server-Side Apps</a> <ul class='children'> <li class="page_item page-item-865"><a href="/oauth2-servers/server-side-apps/authorization-code/" data-section="4.1">Authorization Code Grant</a></li> <li class="page_item page-item-869"><a href="/oauth2-servers/server-side-apps/example-flow/" data-section="4.2">Example Flow</a></li> <li class="page_item page-item-872"><a href="/oauth2-servers/server-side-apps/possible-errors/" data-section="4.3">Possible Errors</a></li> <li class="page_item page-item-874"><a href="/oauth2-servers/server-side-apps/user-experience/" data-section="4.4">User Experience and Security Considerations</a></li> </ul> </li> <li class="page_item page-item-36 page_item_has_children"><a href="/oauth2-servers/single-page-apps/" data-section="5">Single-Page Apps</a> <ul class='children'> <li class="page_item page-item-856"><a href="/oauth2-servers/single-page-apps/authorization/" data-section="5.1">Authorization</a></li> <li class="page_item page-item-850"><a href="/oauth2-servers/single-page-apps/example-flow/" data-section="5.2">Example Flow</a></li> <li class="page_item page-item-847"><a href="/oauth2-servers/single-page-apps/implicit-flow/" data-section="5.3">Implicit Flow for Single-Page Apps</a></li> <li class="page_item page-item-854"><a href="/oauth2-servers/single-page-apps/security-considerations/" data-section="5.4">Security Considerations for Single-Page Apps</a></li> </ul> </li> <li class="page_item page-item-33 page_item_has_children"><a href="/oauth2-servers/mobile-and-native-apps/" data-section="6">Mobile and Native Apps</a> <ul class='children'> <li class="page_item page-item-838"><a href="/oauth2-servers/mobile-and-native-apps/authorization/" data-section="6.1">Authorization</a></li> <li class="page_item page-item-841"><a href="/oauth2-servers/mobile-and-native-apps/security-considerations/" data-section="6.2">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-138 page_item_has_children"><a href="/oauth2-servers/making-authenticated-requests/" data-section="7">Making Authenticated Requests</a> <ul class='children'> <li class="page_item page-item-833"><a href="/oauth2-servers/making-authenticated-requests/refreshing-an-access-token/" data-section="7.1">Refresh Tokens</a></li> </ul> </li> <li class="page_item page-item-140 page_item_has_children"><a href="/oauth2-servers/client-registration/" data-section="8">Client Registration</a> <ul class='children'> <li class="page_item page-item-142"><a href="/oauth2-servers/client-registration/registering-new-application/" data-section="8.1">Registering a New Application</a></li> <li class="page_item page-item-144"><a href="/oauth2-servers/client-registration/client-id-secret/" data-section="8.2">The Client ID and Secret</a></li> <li class="page_item page-item-146"><a href="/oauth2-servers/client-registration/deleting-applications-revoking-secrets/" data-section="8.3">Deleting Applications and Revoking Secrets</a></li> </ul> </li> <li class="page_item page-item-148 page_item_has_children"><a href="/oauth2-servers/authorization/" data-section="9">Authorization</a> <ul class='children'> <li class="page_item page-item-161"><a href="/oauth2-servers/authorization/the-authorization-request/" data-section="9.1">The Authorization Request</a></li> <li class="page_item page-item-164"><a href="/oauth2-servers/authorization/requiring-user-login/" data-section="9.2">Requiring User Login</a></li> <li class="page_item page-item-166"><a href="/oauth2-servers/authorization/the-authorization-interface/" data-section="9.3">The Authorization Interface</a></li> <li class="page_item page-item-168"><a href="/oauth2-servers/authorization/the-authorization-response/" data-section="9.4">The Authorization Response</a></li> <li class="page_item page-item-170"><a href="/oauth2-servers/authorization/security-considerations/" data-section="9.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-174 page_item_has_children"><a href="/oauth2-servers/scope/" data-section="10">Scope</a> <ul class='children'> <li class="page_item page-item-177"><a href="/oauth2-servers/scope/defining-scopes/" data-section="10.1">Defining Scopes</a></li> <li class="page_item page-item-179"><a href="/oauth2-servers/scope/user-interface/" data-section="10.2">User Interface</a></li> <li class="page_item page-item-181"><a href="/oauth2-servers/scope/checkboxes/" data-section="10.3">Checkboxes</a></li> </ul> </li> <li class="page_item page-item-184 page_item_has_children current_page_ancestor current_page_parent"><a href="/oauth2-servers/redirect-uris/" data-section="11">Redirect URLs</a> <ul class='children'> <li class="page_item page-item-186"><a href="/oauth2-servers/redirect-uris/redirect-uri-registration/" data-section="11.1">Redirect URL Registration</a></li> <li class="page_item page-item-188"><a href="/oauth2-servers/redirect-uris/redirect-uris-native-apps/" data-section="11.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-190 current_page_item"><a href="/oauth2-servers/redirect-uris/redirect-uri-validation/" data-section="11.3">Redirect URL Validation</a></li> </ul> </li> <li class="page_item page-item-194 page_item_has_children"><a href="/oauth2-servers/access-tokens/" data-section="12">Access Tokens</a> <ul class='children'> <li class="page_item page-item-196"><a href="/oauth2-servers/access-tokens/authorization-code-request/" data-section="12.1">Authorization Code Request</a></li> <li class="page_item page-item-198"><a href="/oauth2-servers/access-tokens/password-grant/" data-section="12.2">Password Grant</a></li> <li class="page_item page-item-200"><a href="/oauth2-servers/access-tokens/client-credentials/" data-section="12.3">Client Credentials</a></li> <li class="page_item page-item-202"><a href="/oauth2-servers/access-tokens/access-token-response/" data-section="12.4">Access Token Response</a></li> <li class="page_item page-item-204"><a href="/oauth2-servers/access-tokens/self-encoded-access-tokens/" data-section="12.5">Self-Encoded Access Tokens</a></li> <li class="page_item page-item-206"><a href="/oauth2-servers/access-tokens/access-token-lifetime/" data-section="12.6">Access Token Lifetime</a></li> <li class="page_item page-item-208"><a href="/oauth2-servers/access-tokens/refreshing-access-tokens/" data-section="12.7">Refreshing Access Tokens</a></li> </ul> </li> <li class="page_item page-item-210 page_item_has_children"><a href="/oauth2-servers/listing-authorizations/" data-section="13">Listing Authorizations</a> <ul class='children'> <li class="page_item page-item-212"><a href="/oauth2-servers/listing-authorizations/revoking-access/" data-section="13.1">Revoking Access</a></li> </ul> </li> <li class="page_item page-item-216"><a href="/oauth2-servers/the-resource-server/" data-section="14">The Resource Server</a></li> <li class="page_item page-item-608 page_item_has_children"><a href="/oauth2-servers/oauth-native-apps/" data-section="15">OAuth for Native Apps</a> <ul class='children'> <li class="page_item page-item-614"><a href="/oauth2-servers/oauth-native-apps/use-system-browser/" data-section="15.1">Use a System Browser</a></li> <li class="page_item page-item-620"><a href="/oauth2-servers/oauth-native-apps/redirect-urls-for-native-apps/" data-section="15.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-626"><a href="/oauth2-servers/oauth-native-apps/pkce/" data-section="15.3">PKCE Extension</a></li> <li class="page_item page-item-627"><a href="/oauth2-servers/oauth-native-apps/checklist-server-support-native-apps/" data-section="15.4">Checklist for Server Support for Native Apps</a></li> </ul> </li> <li class="page_item page-item-640 page_item_has_children"><a href="/oauth2-servers/device-flow/" data-section="16">OAuth for Browserless and Input-Constrained Devices</a> <ul class='children'> <li class="page_item page-item-643"><a href="/oauth2-servers/device-flow/user-flow/" data-section="16.1">User Flow</a></li> <li class="page_item page-item-656"><a href="/oauth2-servers/device-flow/authorization-request/" data-section="16.2">Authorization Request</a></li> <li class="page_item page-item-660"><a href="/oauth2-servers/device-flow/token-request/" data-section="16.3">Token Request</a></li> <li class="page_item page-item-662"><a href="/oauth2-servers/device-flow/authorization-server-requirements/" data-section="16.4">Authorization Server Requirements</a></li> <li class="page_item page-item-666"><a href="/oauth2-servers/device-flow/security-considerations/" data-section="16.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-668 page_item_has_children"><a href="/oauth2-servers/pkce/" data-section="17">Protecting Apps with PKCE</a> <ul class='children'> <li class="page_item page-item-670"><a href="/oauth2-servers/pkce/authorization-request/" data-section="17.1">Authorization Request</a></li> <li class="page_item page-item-673"><a href="/oauth2-servers/pkce/authorization-code-exchange/" data-section="17.2">Authorization Code Exchange</a></li> </ul> </li> <li class="page_item page-item-214"><a href="/oauth2-servers/token-introspection-endpoint/" data-section="18">Token Introspection Endpoint</a></li> <li class="page_item page-item-220"><a href="/oauth2-servers/creating-documentation/" data-section="19">Creating Documentation</a></li> <li class="page_item page-item-108"><a href="/oauth2-servers/definitions/" data-section="20">Terminology Reference</a></li> <li class="page_item page-item-136 page_item_has_children"><a href="/oauth2-servers/differences-between-oauth-1-2/" data-section="21">Differences Between OAuth 1 and 2</a> <ul class='children'> <li class="page_item page-item-225"><a href="/oauth2-servers/differences-between-oauth-1-2/authentication-and-signatures/" data-section="21.1">Authentication and Signatures</a></li> <li class="page_item page-item-227"><a href="/oauth2-servers/differences-between-oauth-1-2/user-experience-alternative-token-issuance-options/" data-section="21.2">User Experience and Alternative Token Issuance Options</a></li> <li class="page_item page-item-229"><a href="/oauth2-servers/differences-between-oauth-1-2/performance-at-scale/" data-section="21.3">Performance at Scale</a></li> <li class="page_item page-item-231"><a href="/oauth2-servers/differences-between-oauth-1-2/bearer-tokens/" data-section="21.4">Bearer Tokens</a></li> <li class="page_item page-item-233"><a href="/oauth2-servers/differences-between-oauth-1-2/short-lived-tokens-long-lived-authorizations/" data-section="21.5">Short-lived tokens with Long-lived authorizations</a></li> <li class="page_item page-item-235"><a href="/oauth2-servers/differences-between-oauth-1-2/separation-of-roles/" data-section="21.6">Separation of Roles</a></li> </ul> </li> <li class="page_item page-item-676 page_item_has_children"><a href="/oauth2-servers/openid-connect/" data-section="22">OpenID Connect</a> <ul class='children'> <li class="page_item page-item-678"><a href="/oauth2-servers/openid-connect/authorization-vs-authentication/" data-section="22.1">Authorization vs Authentication</a></li> <li class="page_item page-item-680"><a href="/oauth2-servers/openid-connect/building-an-authentication-framework/" data-section="22.2">Building an Authentication Framework</a></li> <li class="page_item page-item-682"><a href="/oauth2-servers/openid-connect/id-tokens/" data-section="22.3">ID Tokens</a></li> <li class="page_item page-item-684"><a href="/oauth2-servers/openid-connect/summary/" data-section="22.4">Summary</a></li> </ul> </li> <li class="page_item page-item-686 page_item_has_children"><a href="/oauth2-servers/indieauth/" data-section="23">IndieAuth</a> <ul class='children'> <li class="page_item page-item-738"><a href="/oauth2-servers/indieauth/discovery/" data-section="23.1">Discovery</a></li> <li class="page_item page-item-688"><a href="/oauth2-servers/indieauth/sign-in/" data-section="23.2">IndieAuth Sign-In Workflow</a></li> <li class="page_item page-item-690"><a href="/oauth2-servers/indieauth/authorization/" data-section="23.3">IndieAuth Authorization Workflow</a></li> </ul> </li> <li class="page_item page-item-693"><a href="/oauth2-servers/map-oauth-2-0-specs/" data-section="24">Map of OAuth 2.0 Specs</a></li> <li class="page_item page-item-697"><a href="/oauth2-servers/tools-and-libraries/" data-section="25">Tools and Libraries</a></li> <li class="page_item page-item-715"><a href="/oauth2-servers/appendix/">Appendix</a></li> </ul> </li> </ul>  </nav>   <a id="menu-icon-close" href="#"> <?xml version="1.0" encoding="UTF-8"?> <svg width="15px" height="15px" viewBox="0 0 15 15" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">  <title>Close</title> <desc>Created with Sketch.</desc> <defs></defs> <g id="Design" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd"> <g id="OAuth---Table-of-Contents-Menu" transform="translate(-1292.000000, -30.000000)" fill-rule="nonzero" fill="#333333"> <g id="ToC-Menu-Open" transform="translate(993.000000, -16.000000)"> <g id="Close" transform="translate(299.000000, 46.000000)"> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape" transform="translate(7.430420, 7.430420) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape-Copy" transform="translate(7.430420, 7.430420) scale(-1, 1) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> </g> </g> </g> </g> </svg> </a> </div>  </header>  </div>  <div id="body" class="clearfix">  <div id="valprop"> <header class="valprop-content"> <h1 class="page-title"> Redirect URL Validation </h1> </header> <span class="section-number">11.3</span> </div>   <div id="layout" class="pagewidth-narrow clearfix">  <div id="content" class="clearfix"> <div id="page-190" class="type-page">  <time datetime="2016-08-17"></time> <h1 class="page-title"> </h1>  <div class="page-content entry-content"> <p>There are three cases when you’ll need to validate redirect URLs.</p> <ul> <li>When the developer registers the redirect URL as part of creating an application</li> <li>In the authorization request (both authorization code and implicit grant types)</li> <li>When the application exchanges an authorization code for an access token</li> </ul> <h3 id="registration">Redirect URL Registration</h3> <p>As discussed in <a href="/oauth2-servers/client-registration/registering-new-application/">Creating an Application</a>, the service should allow developers to register one or more redirect URLs when creating the application. The only restriction on the redirect URL is that it cannot contain a fragment component. The service must allow developers to register redirect URLs with custom URL schemes, in order to support <a href="/oauth2-servers/redirect-uris/redirect-uris-native-apps/">native applications</a> on some platforms.</p> <h3 id="authorization-request">Authorization Request</h3> <p>When the application starts the OAuth flow, it will <a href="/oauth2-servers/authorization/the-authorization-request/">direct the user</a> to your service’s authorization endpoint. The request will have several parameters in the URL, including a redirect URL.</p> <p>At this point, the authorization server must validate the redirect URL to ensure the URL in the request matches one of the registered URLs for the application. The request will also have a <code>client_id</code> parameter, so the service should look up the redirect URLs based on that. It is entirely possible for an attacker to craft an authorization request with one app’s client ID and the attacker’s redirect URL, which is why registration is required.</p> <p>The service should look for an exact match of the URL, and avoid matching on only part of the specific URL. (The client can use the state parameter if it needs to <a href="/oauth2-servers/redirect-uris/redirect-uri-registration/#per-request">customize each request</a>.) Simple string matching is sufficient since the redirect URL can’t be customized per request. All the server needs to do is check that the redirect URL in the request matches one of the redirect URLs the developer entered when registering their application.</p> <p>If the redirect URL is not one of the registered redirect URLs, then the server must immediately show an error indicating such, and not redirect the user. This avoids having your authorization server be used as an <a href="https://oauth.net/advisories/2014-1-covert-redirect/">open redirector</a>.</p> <h3 id="granting-access-tokens">Granting Access Tokens</h3> <p>The token endpoint will get a request to <a href="/oauth2-servers/access-tokens/authorization-code-request/">exchange an authorization code for an access token</a>. This request will contain a redirect URL as well as the authorization code. As an added measure of security, the server should verify that the redirect URL in this request matches exactly the redirect URL that was included in the initial authorization request for this authorization code. If the redirect URL does not match, the server rejects the request with an error.</p> <div id="themify_builder_content-190" data-postid="190" class="themify_builder_content themify_builder_content-190 themify_builder tb_generate_css" style="visibility:hidden;opacity:0;"> </div>    </div>  </div> </div>  <nav id="page"> <div class="alignleft"> <a href="/oauth2-servers/redirect-uris/redirect-uris-native-apps/"><span>Previous Chapter</span>Redirect URLs for Native Apps</a> </div> <div class="alignright"> <a href="/oauth2-servers/access-tokens/"><span>Next Chapter</span>Access Tokens</a> </div> </nav> </div>  </div>  <div id="footerwrap" > <footer id="footer" class="pagewidth clearfix" itemscope="itemscope" itemtype="https://schema.org/WPFooter"> <div class="Row u-Flex u-Stretch"> <div class="no-hassle Column--6 Column--medium-12"> <h3>Want to implement OAuth 2.0 without the hassle?</h3> <p>We've built API access management as a service that is secure, scalable, and always on, so you can 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