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Adds dynamic client registration how-to guide
Closes gh-647
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‎docs/modules/ROOT/nav.adoc

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** xref:guides/how-to-userinfo.adoc[]
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** xref:guides/how-to-jpa.adoc[]
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** xref:guides/how-to-custom-claims-authorities.adoc[]
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** xref:guides/how-to-dynamic-client-registration.adoc[]

‎docs/modules/ROOT/pages/guides/how-to-dynamic-client-registration.adoc

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[[how-to-dynamic-client-registration]]
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= How-to: Register a client dynamically
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:index-link: ../how-to.html
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:docs-dir: ..
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This guide shows how to configure OpenID Connect Dynamic Client Registration 1.0 in Spring Authorization Server and
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walks through an example of how to register a client. Spring Authorization Server implements https://openid.net/specs/openid-connect-registration-1_0.html[OpenID Connect Dynamic Client Registration 1.0]
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specification, gaining the ability to dynamically register and retrieve OpenID clients.
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- xref:guides/how-to-dynamic-client-registration.adoc#enable[Enable Dynamic Client Registration in Spring Authorization Server]
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- xref:guides/how-to-dynamic-client-registration.adoc#configure-initial-client[Configure initial client]
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- xref:guides/how-to-dynamic-client-registration.adoc#fetch-initial-access-token[Fetch initial access token]
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- xref:guides/how-to-dynamic-client-registration.adoc#register-client[Register a client]
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- xref:guides/how-to-dynamic-client-registration.adoc#fetch-client[Fetch client]
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[[enable]]
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== Enable Dynamic Client Registration in Spring Authorization Server
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By default, dynamic client registration functionality is turned off in Spring Authorization Server.
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To enable, add the following configuration:
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[[sample.dcrAuthServerConfig]]
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[source,java]
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----
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include::{examples-dir}/main/java/sample/dcr/DcrConfiguration.java[]
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----
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<1> Add a `SecurityFilterChain` `@Bean` that registers an `OAuth2AuthorizationServerConfigurer`
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<2> In the configurer, apply OIDC client registration endpoint customizer with default values.
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This enables dynamic client registration functionality.
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Please refer to xref:protocol-endpoints.adoc#oidc-client-registration-endpoint[Client Registration Endpoint docs] for
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in-depth configuration details.
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[[configure-initial-client]]
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== Configure initial client
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An initial client is required in order to register new clients in the authorization server. The client must be configured
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with scopes `client.create` and optionally `client.read` for creating clients and reading clients, respectively.
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A programmatic example of such a client is below.
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[[sample.dcrRegisteredClientConfig]]
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[source,java]
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----
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include::{examples-dir}/main/java/sample/dcr/RegisteredClientConfiguration.java[]
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----
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<1> A `RegisteredClientRepository` `@Bean` is configured with a set of clients.
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<2> An initial client with client id `initial-client` is configured.
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<3> `client_credentials` grant type is set to fetch access tokens directly.
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<4> `client.create` scope is configured for the client to ensure they are able to create clients.
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<5> `client.read` scope is configured for the client to ensure they are able to fetch and read clients.
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<6> The initial client is saved into the data store.
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After configuring the above, run the authorization server in your preferred environment.
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[[fetch-initial-access-token]]
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== Fetch initial access token
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An initial access token is required to be able to create client registration requests. The token request must contain a
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request for scope `client.create` only.
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[source,console]
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----
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curl -X POST --location "https://authserver.example.org/oauth2/token" --http1.1 \
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-H "Authorization: Basic <base64-encoded-credentials>" \
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-H "Content-Type: application/x-www-form-urlencoded" \
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-d "grant_type=client_credentials&scope=client.create"
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----
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[WARNING]
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====
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If you provide more than one scope in the request, you will not be able to register a client. The client creation
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request requires an access token with a single scope of `client.create`
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====
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[TIP]
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====
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To obtain encoded credentials for the above request, `base64` encode the client credentials in the format of
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`<clientId>:<clientSecret>`. Below is an encoding operation for the example in this guide.
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[source,console]
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----
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echo -n "initial-app:secret" | base64
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----
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====
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[[register-client]]
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== Register a client
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With an access token obtained from the previous step, register a new client with the following request.
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[NOTE]
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The access token can only be used once. After a single registration request, the access token is invalidated.
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[source,console]
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----
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curl -X POST --location "https://authserver.example.org/connect/register" --http1.1 \
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-H "Content-Type: application/json" \
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-H "Accept: application/json" \
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-H "Authorization: Bearer <initial-access-token>" \
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-d "{
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\"client_name\": \"My Example\",
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\"grant_types\": [
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\"authorization_code\",
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\"client_credentials\",
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\"refresh_token\"
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],
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\"scope\": \"openid profile email\",
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\"redirect_uris\": [
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\"https://client.example.org/callback\",
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\"https://client.example.org/callback2\"
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],
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\"token_endpoint_auth_method\": \"client_secret_basic\",
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\"post_logout_redirect_uris\": [
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\"https://client.example.org/logout\"
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]
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}"
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----
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An example register client response may be as follows:
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[source,console]
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----
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HTTP/1.1 201
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...
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{
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"client_id": "Q_AQ0wUzbTXo-IE4rNJbU9Dv8BBex1zQrjDeJs0mDbM",
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"client_id_issued_at": 1690726915,
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"client_name": "My Example",
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"client_secret": "XleADJhomxA2Rmyom2hmpnS6_CDnyAFBI9JsGeC-XQ0QLa9p9JExXJABiYz7fOXA",
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"redirect_uris": [
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"https://client.example.org/callback",
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"https://client.example.org/callback2"
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],
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"post_logout_redirect_uris": [
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"https://client.example.org/logout"
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],
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"grant_types": [
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"refresh_token",
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"client_credentials",
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"authorization_code"
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],
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"response_types": [
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"code"
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],
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"scope": "openid profile email",
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"token_endpoint_auth_method": "client_secret_basic",
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"id_token_signed_response_alg": "RS256",
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"registration_client_uri": "https://authserver.example.org/connect/register?client_id=Q_AQ0wUzbTXo-IE4rNJbU9Dv8BBex1zQrjDeJs0mDbM",
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"registration_access_token": "<access-token>",
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"client_secret_expires_at": 0
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}
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----
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With the client registered, a `registration_access_token` and a `registration_client_uri` are provided to be able to
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read the created client in a follow up request. The next step is optional.
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[[fetch-client]]
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== Fetch client
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Using fields `registration_access_token` and `registration_client_uri` from the previous step's response, read the client
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with the following request:
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[source,console]
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----
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curl -X GET --location "<registration_client_uri>" \
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-H "Authorization: Bearer <registration_access_token>" \
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-H "Accept: application/json"
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----
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The response should contain the same information about the client as seen when the client was first registered, with
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the exception of `registration_access_token` field.

‎docs/src/main/java/sample/dcr/DcrConfiguration.java

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package sample.dcr;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.security.config.Customizer;
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import org.springframework.security.config.annotation.web.builders.HttpSecurity;
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import org.springframework.security.oauth2.server.authorization.config.annotation.web.configurers.OAuth2AuthorizationServerConfigurer;
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import org.springframework.security.web.SecurityFilterChain;
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@Configuration
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public class DcrConfiguration {
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@Bean // <1>
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public SecurityFilterChain authorizationServerSecurityFilterChain(HttpSecurity http) throws Exception {
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OAuth2AuthorizationServerConfigurer authorizationServerConfigurer =
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new OAuth2AuthorizationServerConfigurer();
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http.apply(authorizationServerConfigurer);
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authorizationServerConfigurer
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.oidc(oidc ->
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oidc.clientRegistrationEndpoint(Customizer.withDefaults()) // <2>
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);
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return http.build();
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}
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}

‎docs/src/main/java/sample/dcr/RegisteredClientConfiguration.java

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package sample.dcr;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.jdbc.core.JdbcTemplate;
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import org.springframework.security.oauth2.core.AuthorizationGrantType;
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import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
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import org.springframework.security.oauth2.server.authorization.client.JdbcRegisteredClientRepository;
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import org.springframework.security.oauth2.server.authorization.client.RegisteredClient;
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import org.springframework.security.oauth2.server.authorization.client.RegisteredClientRepository;
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import java.util.UUID;
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@Configuration
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public class RegisteredClientConfiguration {
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@Bean // <1>
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public RegisteredClientRepository registeredClientRepository(JdbcTemplate jdbcTemplate) {
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RegisteredClient initialClient = RegisteredClient.withId(UUID.randomUUID().toString())
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.clientId("initial-client") // <2>
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.clientSecret("{noop}secret")
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.clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_BASIC)
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.authorizationGrantType(AuthorizationGrantType.CLIENT_CREDENTIALS) // <3>
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.scope("client.create") // <4>
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.scope("client.read") // <5>
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.build();
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JdbcRegisteredClientRepository registeredClientRepository = new JdbcRegisteredClientRepository(jdbcTemplate);
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registeredClientRepository.save(initialClient); // <6>
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return registeredClientRepository;
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}
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}

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