{"id":16,"date":"2026-02-14T14:21:27","date_gmt":"2026-02-14T14:21:27","guid":{"rendered":"https:\/\/vlastolabs.com\/?p=16"},"modified":"2026-02-15T18:07:23","modified_gmt":"2026-02-15T18:07:23","slug":"keycloak-invite-registration-installation","status":"publish","type":"post","link":"https:\/\/vlastolabs.com\/?p=16","title":{"rendered":"Keycloak SPI Extension for Invitation-Only User Registration with Time-Limited Tokens (Keycloak 26+)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">From Open Registration to Invitation-Only: A Security Imperative<\/h2>\n\n\n\n<p><strong>Open self-registration is a security risk.<\/strong> While convenient for user acquisition, unrestricted registration opens the door to spam accounts, bot attacks, and abuse of free tiers-problems that plague many SaaS platforms.<\/p>\n\n\n\n<p><strong>Enterprise customers need better control.<\/strong> Invitation-only registration ensures that only authorized users can access your systems, while time-limited tokens prevent misuse and maintain security boundaries.<\/p>\n\n\n\n<p><strong>The Keycloak Invite Registration extension solves this.<\/strong> This custom SPI enforces invitation-only registration with secure, time-limited tokens. You maintain Keycloak&#8217;s powerful identity management while adding the security controls enterprise applications require.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step-by-Step Invitation Process Flow<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Token Request: Administrator or API client requests registration token for specific user<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>Token Generation: System creates cryptographically secure token with embedded metadata<\/li>\n\n\n\n<li>Storage: Token persists in database with expiration timestamp<\/li>\n\n\n\n<li>Distribution: Token sends to target user via secure channel (email, API response)<\/li>\n\n\n\n<li>Registration Attempt: User navigates to registration endpoint with token<\/li>\n\n\n\n<li>Validation: Authenticator SPI validates token authenticity and expiration<\/li>\n\n\n\n<li>User Creation: Valid tokens proceed with standard registration workflow<\/li>\n\n\n\n<li>Token Invalidation: Successfully used tokens become invalid for future use<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Installing the Keycloak Invite Registration Extension<\/h2>\n\n\n\n<p>A quick guide to set up invitation-only registration for your Keycloak instance.<\/p>\n\n\n\n<p>Prerequisites<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Keycloak 26.0.0 or higher<\/li>\n\n\n\n<li>Java 21 or higher<\/li>\n\n\n\n<li>Admin access to your Keycloak server<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Installation Steps<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Download the Extension<\/h3>\n\n\n\n<p>Visit the <a href=\"https:\/\/github.com\/VlastoLabs\/keycloak-invite-registration\/releases\">GitHub releases page<\/a> and download the latest <code>keycloak-invite-registration-*.jar<\/code> file.<\/p>\n\n\n\n<p>Alternatively, clone and build from source:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>git clone https:\/\/github.com\/VlastoLabs\/keycloak-invite-registration.git\ncd keycloak-invite-registration\nmvn clean install<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. Deploy to Keycloak<\/h3>\n\n\n\n<p>Copy the JAR file to your Keycloak providers directory:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cp keycloak-invite-registration-*.jar \/opt\/keycloak\/providers\/<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. Restart Keycloak<\/h3>\n\n\n\n<p>bash<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/path\/to\/keycloak\/bin\/kc.sh start<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4. Configure the Registration Flow<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Log into Keycloak Admin Console Navigate to <strong>Authentication \u2192 Flows<\/strong> <\/li>\n\n\n\n<li>Find the <strong>registration<\/strong> flow and click the <strong>\u22ee<\/strong> menu, then select <strong>Duplicate<\/strong> <\/li>\n\n\n\n<li>Name it (e.g., &#8220;Registration with Invite&#8221;) <\/li>\n\n\n\n<li>Click <strong>Add step<\/strong> and select <strong>&#8220;<strong>Registration Invite Gate<\/strong>&#8220;<\/strong> <\/li>\n\n\n\n<li>Drag and drop the &#8220;Invite Code Validation&#8221; step to place it <strong>above<\/strong> the &#8220;Registration User Profile Creation&#8221; step <\/li>\n\n\n\n<li>Set &#8220;<strong><strong>Registration Invite Gate<\/strong><\/strong>&#8221; execution to <strong>REQUIRED<\/strong><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"460\" src=\"https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1024x460.png\" alt=\"\" class=\"wp-image-19\" srcset=\"https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1024x460.png 1024w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-300x135.png 300w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-768x345.png 768w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1536x690.png 1536w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-2048x919.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Bind the New Flow<\/strong><\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Navigate to <strong>Authentication \u2192 Find your new flow <\/strong>(e.g., &#8220;Registration with Invite&#8221;) -&gt;  Click the <strong>\u22ee<\/strong> menu -&gt; Bind flow -&gt; Registration Flow<\/li>\n\n\n\n<li>Click <strong>Save<\/strong><\/li>\n<\/ol>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Configure the Login Theme<\/strong><\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Navigate to <strong>Realm Settings \u2192 Themes<\/strong><\/li>\n\n\n\n<li>Under <strong>Login theme<\/strong>, select <strong>&#8220;keycloak.withInviteCode&#8221;<\/strong><\/li>\n\n\n\n<li>Click <strong>Save<\/strong><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"345\" src=\"https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1-1024x345.png\" alt=\"\" class=\"wp-image-20\" srcset=\"https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1-1024x345.png 1024w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1-300x101.png 300w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1-768x259.png 768w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1-1536x518.png 1536w, https:\/\/vlastolabs.com\/wp-content\/uploads\/2026\/02\/image-1-2048x691.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><br>5. Usage<\/h3>\n\n\n\n<p>Generate invitation tokens via the REST API:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>curl -X POST \\\n  http:\/\/localhost:8080\/admin\/realms\/{realm}\/invites\/generate \\\n  -H 'Authorization: Bearer &lt;admin_token&gt;' \\\n  -H 'Content-Type: application\/json'<\/code><\/pre>\n\n\n\n<p><strong>Response:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{\n  \"token\": \"aab396f3-0e16-492e-b5ff-e15d90d7aa56\",\n  \"realm\": \"mycompany\",\n  \"message\": \"Invitation token generated successfully\",\n  \"expirationTime\": 1703123456789,\n  \"used\": false\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Build the Registration URL<\/h4>\n\n\n\n<p>Construct the registration URL with the `inviteCode` parameter:<br><code>https:\/\/auth.example.com\/realms\/{realm}\/protocol\/openid-connect\/registrations?client_id={client_id}&amp;scope=openid%20profile&amp;redirect_uri={redirect_uri}&amp;response_type=code&amp;inviteCode={token}<\/code><br><br><strong>Complete Example<\/strong>:<br><code>https:\/\/auth.example.com\/realms\/mycompany\/protocol\/openid-connect\/registrations?client_id=my-app&amp;scope=openid%20profile&amp;redirect_uri=https:\/\/app.example.com\/callback&amp;response_type=code&amp;inviteCode=aab396f3-0e16-492e-b5ff-e15d90d7aa56<\/code><\/p>\n\n\n\n<p><strong>URL Parameters:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>{realm}<\/code> &#8211; Your Keycloak realm name (e.g., <code>mycompany<\/code>)<\/li>\n\n\n\n<li><code>{client_id}<\/code> &#8211; Your OIDC client ID (e.g., <code>my-app<\/code>)<\/li>\n\n\n\n<li><code>{redirect_uri}<\/code> &#8211; URL-encoded redirect URI after registration (e.g., <code>https:\/\/app.example.com\/callback<\/code>)<\/li>\n\n\n\n<li><code>{token}<\/code> &#8211; The invitation token from step 1<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Send the Invitation<\/strong><\/h4>\n\n\n\n<p>Share the complete registration URL with your invitee via email or other secure channel. When they open the link, they&#8217;ll be directed to the registration form with the invitation token automatically validated.<\/p>\n\n\n\n<p><strong>Important Notes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tokens expire after 24 hours<\/li>\n\n\n\n<li>Each token can only be used once<\/li>\n\n\n\n<li>Users without a valid token cannot register<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>GitHub Repository<\/strong>: <a href=\"https:\/\/github.com\/VlastoLabs\/keycloak-invite-registration\">VlastoLabs\/keycloak-invite-registration<\/a><br><\/p>\n\n\n\n<p>If you are interested in partnering with us, need a tailored solution, or would like to help shape the future direction of our Keycloak extension, we would be glad to connect. Please reach out at <a>contact@vlastolabs.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>From Open Registration to Invitation-Only: A Security Imperative Open self-registration is a security risk. While convenient for user acquisition, unrestricted registration opens the door to spam accounts, bot attacks, and abuse of free tiers-problems that plague many SaaS platforms. Enterprise customers need better control. Invitation-only registration ensures that only authorized users can access your systems, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[11,7,13,14,6,10,9,12,8],"class_list":["post-16","post","type-post","status-publish","format-standard","hentry","category-keycloak","tag-access-control","tag-authentication","tag-invitation-only","tag-java","tag-keycloak","tag-keycloak-spi","tag-registration","tag-security","tag-user"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Keycloak Invite Registration: Installation Guide | VlastoLabs<\/title>\n<meta name=\"description\" content=\"Step-by-step guide to install and configure the Keycloak Invite Registration extension for secure, invitation-only user registration with time-limited tokens.\" 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