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Advanced Configuration
The OAuth 2.0 Authorization Framework defines the Protocol Endpoints as follows:
The authorization process utilizes two authorization server endpoints (HTTP resources):
-
Authorization Endpoint: Used by the client to obtain authorization from the resource owner via user-agent redirection.
-
Token Endpoint: Used by the client to exchange an authorization grant for an access token, typically with client authentication.
As well as one client endpoint:
-
Redirection Endpoint: Used by the authorization server to return responses containing authorization credentials to the client via the resource owner user-agent.
The OpenID Connect Core 1.0 specification defines the UserInfo Endpoint as follows:
The UserInfo Endpoint is an OAuth 2.0 Protected Resource that returns claims about the authenticated end-user. To obtain the requested claims about the end-user, the client makes a request to the UserInfo Endpoint by using an access token obtained through OpenID Connect Authentication. These claims are normally represented by a JSON object that contains a collection of name-value pairs for the claims.
ServerHttpSecurity.oauth2Login()
provides a number of configuration options for customizing OAuth 2.0 Login.
The following code shows the complete configuration options available for the oauth2Login()
DSL:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http) {
http
.oauth2Login(oauth2 -> oauth2
.authenticationConverter(this.authenticationConverter())
.authenticationMatcher(this.authenticationMatcher())
.authenticationManager(this.authenticationManager())
.authenticationSuccessHandler(this.authenticationSuccessHandler())
.authenticationFailureHandler(this.authenticationFailureHandler())
.clientRegistrationRepository(this.clientRegistrationRepository())
.authorizedClientRepository(this.authorizedClientRepository())
.authorizedClientService(this.authorizedClientService())
.authorizationRequestResolver(this.authorizationRequestResolver())
.authorizationRequestRepository(this.authorizationRequestRepository())
.securityContextRepository(this.securityContextRepository())
);
return http.build();
}
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
oauth2Login {
authenticationConverter = authenticationConverter()
authenticationMatcher = authenticationMatcher()
authenticationManager = authenticationManager()
authenticationSuccessHandler = authenticationSuccessHandler()
authenticationFailureHandler = authenticationFailureHandler()
clientRegistrationRepository = clientRegistrationRepository()
authorizedClientRepository = authorizedClientRepository()
authorizedClientService = authorizedClientService()
authorizationRequestResolver = authorizationRequestResolver()
authorizationRequestRepository = authorizationRequestRepository()
securityContextRepository = securityContextRepository()
}
}
return http.build()
}
}
The following sections go into more detail on each of the configuration options available:
OAuth 2.0 Login Page
By default, the OAuth 2.0 Login Page is auto-generated by the LoginPageGeneratingWebFilter
.
The default login page shows each configured OAuth Client with its ClientRegistration.clientName
as a link, which is capable of initiating the Authorization Request (or OAuth 2.0 Login).
In order for LoginPageGeneratingWebFilter to show links for configured OAuth Clients, the registered ReactiveClientRegistrationRepository needs to also implement Iterable<ClientRegistration> .
See InMemoryReactiveClientRegistrationRepository for reference.
|
The link’s destination for each OAuth Client defaults to the following:
"/oauth2/authorization/{registrationId}"
The following line shows an example:
<a href="/oauth2/authorization/google">Google</a>
To override the default login page, configure the exceptionHandling().authenticationEntryPoint()
and (optionally) oauth2Login().authorizationRequestResolver()
.
The following listing shows an example:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
http
.exceptionHandling(exceptionHandling -> exceptionHandling
.authenticationEntryPoint(new RedirectServerAuthenticationEntryPoint("/login/oauth2"))
)
.oauth2Login(oauth2 -> oauth2
.authorizationRequestResolver(this.authorizationRequestResolver())
);
return http.build();
}
private ServerOAuth2AuthorizationRequestResolver authorizationRequestResolver() {
ServerWebExchangeMatcher authorizationRequestMatcher =
new PathPatternParserServerWebExchangeMatcher(
"/login/oauth2/authorization/{registrationId}");
return new DefaultServerOAuth2AuthorizationRequestResolver(
this.clientRegistrationRepository(), authorizationRequestMatcher);
}
...
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
exceptionHandling {
authenticationEntryPoint = RedirectServerAuthenticationEntryPoint("/login/oauth2")
}
oauth2Login {
authorizationRequestResolver = authorizationRequestResolver()
}
}
return http.build()
}
private fun authorizationRequestResolver(): ServerOAuth2AuthorizationRequestResolver {
val authorizationRequestMatcher: ServerWebExchangeMatcher = PathPatternParserServerWebExchangeMatcher(
"/login/oauth2/authorization/{registrationId}"
)
return DefaultServerOAuth2AuthorizationRequestResolver(
clientRegistrationRepository(), authorizationRequestMatcher
)
}
...
}
You need to provide a @Controller with a @RequestMapping("/login/oauth2") that is capable of rendering the custom login page.
|
As noted earlier, configuring The following line shows an example:
|
Redirection Endpoint
The Redirection Endpoint is used by the Authorization Server for returning the Authorization Response (which contains the authorization credentials) to the client via the Resource Owner user-agent.
OAuth 2.0 Login leverages the Authorization Code Grant. Therefore, the authorization credential is the authorization code. |
The default Authorization Response redirection endpoint is /login/oauth2/code/{registrationId}
.
If you would like to customize the Authorization Response redirection endpoint, configure it as shown in the following example:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
http
.oauth2Login(oauth2 -> oauth2
.authenticationMatcher(new PathPatternParserServerWebExchangeMatcher("/login/oauth2/callback/{registrationId}"))
);
return http.build();
}
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
oauth2Login {
authenticationMatcher = PathPatternParserServerWebExchangeMatcher("/login/oauth2/callback/{registrationId}")
}
}
return http.build()
}
}
You also need to ensure the The following listing shows an example:
|
UserInfo Endpoint
The UserInfo Endpoint includes a number of configuration options, as described in the following sub-sections:
Mapping User Authorities
After the user successfully authenticates with the OAuth 2.0 Provider, the OAuth2User.getAuthorities()
(or OidcUser.getAuthorities()
) contains a list of granted authorities populated from OAuth2UserRequest.getAccessToken().getScopes()
and prefixed with SCOPE_
.
These granted authorities may be mapped to a new set of GrantedAuthority
instances, which will be supplied to OAuth2AuthenticationToken
when completing the authentication.
OAuth2AuthenticationToken.getAuthorities() is used for authorizing requests, such as in hasRole('USER') or hasRole('ADMIN') .
|
There are a couple of options to choose from when mapping user authorities:
Using a GrantedAuthoritiesMapper
The GrantedAuthoritiesMapper
is given a list of granted authorities which contains a special authority of type OAuth2UserAuthority
and the authority string OAUTH2_USER
(or OidcUserAuthority
and the authority string OIDC_USER
).
Register a GrantedAuthoritiesMapper
@Bean
to have it automatically applied to the configuration, as shown in the following example:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
http
...
.oauth2Login(withDefaults());
return http.build();
}
@Bean
public GrantedAuthoritiesMapper userAuthoritiesMapper() {
return (authorities) -> {
Set<GrantedAuthority> mappedAuthorities = new HashSet<>();
authorities.forEach(authority -> {
if (OidcUserAuthority.class.isInstance(authority)) {
OidcUserAuthority oidcUserAuthority = (OidcUserAuthority)authority;
OidcIdToken idToken = oidcUserAuthority.getIdToken();
OidcUserInfo userInfo = oidcUserAuthority.getUserInfo();
// Map the claims found in idToken and/or userInfo
// to one or more GrantedAuthority's and add it to mappedAuthorities
} else if (OAuth2UserAuthority.class.isInstance(authority)) {
OAuth2UserAuthority oauth2UserAuthority = (OAuth2UserAuthority)authority;
Map<String, Object> userAttributes = oauth2UserAuthority.getAttributes();
// Map the attributes found in userAttributes
// to one or more GrantedAuthority's and add it to mappedAuthorities
}
});
return mappedAuthorities;
};
}
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
oauth2Login { }
}
return http.build()
}
@Bean
fun userAuthoritiesMapper(): GrantedAuthoritiesMapper = GrantedAuthoritiesMapper { authorities: Collection<GrantedAuthority> ->
val mappedAuthorities = emptySet<GrantedAuthority>()
authorities.forEach { authority ->
if (authority is OidcUserAuthority) {
val idToken = authority.idToken
val userInfo = authority.userInfo
// Map the claims found in idToken and/or userInfo
// to one or more GrantedAuthority's and add it to mappedAuthorities
} else if (authority is OAuth2UserAuthority) {
val userAttributes = authority.attributes
// Map the attributes found in userAttributes
// to one or more GrantedAuthority's and add it to mappedAuthorities
}
}
mappedAuthorities
}
}
Delegation-based strategy with ReactiveOAuth2UserService
This strategy is advanced compared to using a GrantedAuthoritiesMapper
, however, it’s also more flexible as it gives you access to the OAuth2UserRequest
and OAuth2User
(when using an OAuth 2.0 UserService) or OidcUserRequest
and OidcUser
(when using an OpenID Connect 1.0 UserService).
The OAuth2UserRequest
(and OidcUserRequest
) provides you access to the associated OAuth2AccessToken
, which is very useful in the cases where the delegator needs to fetch authority information from a protected resource before it can map the custom authorities for the user.
The following example shows how to implement and configure a delegation-based strategy using an OpenID Connect 1.0 UserService:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
http
...
.oauth2Login(withDefaults());
return http.build();
}
@Bean
public ReactiveOAuth2UserService<OidcUserRequest, OidcUser> oidcUserService() {
final OidcReactiveOAuth2UserService delegate = new OidcReactiveOAuth2UserService();
return (userRequest) -> {
// Delegate to the default implementation for loading a user
return delegate.loadUser(userRequest)
.flatMap((oidcUser) -> {
OAuth2AccessToken accessToken = userRequest.getAccessToken();
Set<GrantedAuthority> mappedAuthorities = new HashSet<>();
// TODO
// 1) Fetch the authority information from the protected resource using accessToken
// 2) Map the authority information to one or more GrantedAuthority's and add it to mappedAuthorities
// 3) Create a copy of oidcUser but use the mappedAuthorities instead
ProviderDetails providerDetails = userRequest.getClientRegistration().getProviderDetails();
String userNameAttributeName = providerDetails.getUserInfoEndpoint().getUserNameAttributeName();
if (StringUtils.hasText(userNameAttributeName)) {
oidcUser = new DefaultOidcUser(mappedAuthorities, oidcUser.getIdToken(), oidcUser.getUserInfo(), userNameAttributeName);
} else {
oidcUser = new DefaultOidcUser(mappedAuthorities, oidcUser.getIdToken(), oidcUser.getUserInfo());
}
return Mono.just(oidcUser);
});
};
}
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
oauth2Login { }
}
return http.build()
}
@Bean
fun oidcUserService(): ReactiveOAuth2UserService<OidcUserRequest, OidcUser> {
val delegate = OidcReactiveOAuth2UserService()
return ReactiveOAuth2UserService { userRequest ->
// Delegate to the default implementation for loading a user
delegate.loadUser(userRequest)
.flatMap { oidcUser ->
val accessToken = userRequest.accessToken
val mappedAuthorities = mutableSetOf<GrantedAuthority>()
// TODO
// 1) Fetch the authority information from the protected resource using accessToken
// 2) Map the authority information to one or more GrantedAuthority's and add it to mappedAuthorities
// 3) Create a copy of oidcUser but use the mappedAuthorities instead
val providerDetails = userRequest.getClientRegistration().getProviderDetails()
val userNameAttributeName = providerDetails.getUserInfoEndpoint().getUserNameAttributeName()
val mappedOidcUser = if (StringUtils.hasText(userNameAttributeName)) {
DefaultOidcUser(mappedAuthorities, oidcUser.idToken, oidcUser.userInfo, userNameAttributeName)
} else {
DefaultOidcUser(mappedAuthorities, oidcUser.idToken, oidcUser.userInfo)
}
Mono.just(mappedOidcUser)
}
}
}
}
OAuth 2.0 UserService
DefaultReactiveOAuth2UserService
is an implementation of a ReactiveOAuth2UserService
that supports standard OAuth 2.0 Provider’s.
ReactiveOAuth2UserService obtains the user attributes of the end-user (the resource owner) from the UserInfo Endpoint (by using the access token granted to the client during the authorization flow) and returns an AuthenticatedPrincipal in the form of an OAuth2User .
|
DefaultReactiveOAuth2UserService
uses a WebClient
when requesting the user attributes at the UserInfo Endpoint.
If you need to customize the pre-processing of the UserInfo Request and/or the post-handling of the UserInfo Response, you will need to provide DefaultReactiveOAuth2UserService.setWebClient()
with a custom configured WebClient
.
Whether you customize DefaultReactiveOAuth2UserService
or provide your own implementation of ReactiveOAuth2UserService
, you’ll need to configure it as shown in the following example:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
http
...
.oauth2Login(withDefaults());
return http.build();
}
@Bean
public ReactiveOAuth2UserService<OAuth2UserRequest, OAuth2User> oauth2UserService() {
...
}
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
oauth2Login { }
}
return http.build()
}
@Bean
fun oauth2UserService(): ReactiveOAuth2UserService<OAuth2UserRequest, OAuth2User> {
// ...
}
}
OpenID Connect 1.0 UserService
OidcReactiveOAuth2UserService
is an implementation of a ReactiveOAuth2UserService
that supports OpenID Connect 1.0 Provider’s.
The OidcReactiveOAuth2UserService
leverages the DefaultReactiveOAuth2UserService
when requesting the user attributes at the UserInfo Endpoint.
If you need to customize the pre-processing of the UserInfo Request and/or the post-handling of the UserInfo Response, you will need to provide OidcReactiveOAuth2UserService.setOauth2UserService()
with a custom configured ReactiveOAuth2UserService
.
Whether you customize OidcReactiveOAuth2UserService
or provide your own implementation of ReactiveOAuth2UserService
for OpenID Connect 1.0 Provider’s, you’ll need to configure it as shown in the following example:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
public class OAuth2LoginSecurityConfig {
@Bean
public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
http
...
.oauth2Login(withDefaults());
return http.build();
}
@Bean
public ReactiveOAuth2UserService<OidcUserRequest, OidcUser> oidcUserService() {
...
}
}
@Configuration
@EnableWebFluxSecurity
class OAuth2LoginSecurityConfig {
@Bean
fun securityWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
http {
oauth2Login { }
}
return http.build()
}
@Bean
fun oidcUserService(): ReactiveOAuth2UserService<OidcUserRequest, OidcUser> {
// ...
}
}
ID Token Signature Verification
OpenID Connect 1.0 Authentication introduces the ID Token, which is a security token that contains Claims about the Authentication of an End-User by an Authorization Server when used by a Client.
The ID Token is represented as a JSON Web Token (JWT) and MUST be signed using JSON Web Signature (JWS).
The ReactiveOidcIdTokenDecoderFactory
provides a ReactiveJwtDecoder
used for OidcIdToken
signature verification. The default algorithm is RS256
but may be different when assigned during client registration.
For these cases, a resolver may be configured to return the expected JWS algorithm assigned for a specific client.
The JWS algorithm resolver is a Function
that accepts a ClientRegistration
and returns the expected JwsAlgorithm
for the client, eg. SignatureAlgorithm.RS256
or MacAlgorithm.HS256
The following code shows how to configure the OidcIdTokenDecoderFactory
@Bean
to default to MacAlgorithm.HS256
for all ClientRegistration
:
-
Java
-
Kotlin
@Bean
public ReactiveJwtDecoderFactory<ClientRegistration> idTokenDecoderFactory() {
ReactiveOidcIdTokenDecoderFactory idTokenDecoderFactory = new ReactiveOidcIdTokenDecoderFactory();
idTokenDecoderFactory.setJwsAlgorithmResolver(clientRegistration -> MacAlgorithm.HS256);
return idTokenDecoderFactory;
}
@Bean
fun idTokenDecoderFactory(): ReactiveJwtDecoderFactory<ClientRegistration> {
val idTokenDecoderFactory = ReactiveOidcIdTokenDecoderFactory()
idTokenDecoderFactory.setJwsAlgorithmResolver { MacAlgorithm.HS256 }
return idTokenDecoderFactory
}
For MAC based algorithms such as HS256 , HS384 or HS512 , the client-secret corresponding to the client-id is used as the symmetric key for signature verification.
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If more than one ClientRegistration is configured for OpenID Connect 1.0 Authentication, the JWS algorithm resolver may evaluate the provided ClientRegistration to determine which algorithm to return.
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Then, you can proceed to configure logout.