I am using a setup with Keycloak as Identity Provider, Spring Cloud Gateway as API Gateway and multiple Microservices.
I can receive a JWT via my Gateway (redirecting to Keycloak) via http://localhost:8050/auth/realms/dev/protocol/openid-connect/token
.
I can use the JWT to access a resource directly located at the Keycloak server (e.g. http://localhost:8080/auth/admin/realms/dev/users
).
But when I want to use the Gateway to relay me to the same resource (http://localhost:8050/auth/admin/realms/dev/users
) I get the Keycloak Login form as response.
My conclusion is that there must me a misconfiguration in my Spring Cloud Gateway application.
This is the Security Configuration in the Gateway:
@Configuration
@EnableWebFluxSecurity
@EnableReactiveMethodSecurity
public class SecurityConfiguration {
@Bean
public SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http, ReactiveClientRegistrationRepository clientRegistrationRepository) {
// Authenticate through configured OpenID Provider
http.oauth2Login();
// Also logout at the OpenID Connect provider
http.logout(logout -> logout.logoutSuccessHandler(
new OidcClientInitiatedServerLogoutSuccessHandler(clientRegistrationRepository)));
//Exclude /auth from authentication
http.authorizeExchange().pathMatchers("/auth/realms/ahearo/protocol/openid-connect/token").permitAll();
// Require authentication for all requests
http.authorizeExchange().anyExchange().authenticated();
// Allow showing /home within a frame
http.headers().frameOptions().mode(Mode.SAMEORIGIN);
// Disable CSRF in the gateway to prevent conflicts with proxied service CSRF
http.csrf().disable();
return http.build();
}
}
This is my application.yaml in the Gateway:
spring:
application:
name: gw-service
cloud:
gateway:
default-filters:
- TokenRelay
discovery:
locator:
lower-case-service-id: true
enabled: true
routes:
- id: auth
uri: http://localhost:8080
predicates:
- Path=/auth/**
security:
oauth2:
client:
registration:
keycloak:
client-id: 'api-gw'
client-secret: 'not-relevant-but-correct'
authorizationGrantType: authorization_code
redirect-uri: '{baseUrl}/login/oauth2/code/{registrationId}'
scope: openid,profile,email,resource.read
provider:
keycloak:
issuerUri: http://localhost:8080/auth/realms/dev
user-name-attribute: preferred_username
server:
port: 8050
eureka:
client:
service-url:
default-zone: http://localhost:8761/eureka
register-with-eureka: true
fetch-registry: true
How can I make the Gateway able to know that the user is authenticated (using the JWT) and not redirect me to the login page?
If you want to make requests to Spring Gateway with access token you need to make it a resource server. Add the following:
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
</dependency>
application.yml
security:
oauth2:
resourceserver:
jwt:
issuer-uri: https://.../auth/realms/...
SecurityConfiguration.java
@Bean
public SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http,
ReactiveClientRegistrationRepository clientRegistrationRepository) {
// Authenticate through configured OpenID Provider
http.oauth2Login();
// Also logout at the OpenID Connect provider
http.logout(logout -> logout.logoutSuccessHandler(
new OidcClientInitiatedServerLogoutSuccessHandler(clientRegistrationRepository)));
// Require authentication for all requests
http.authorizeExchange().anyExchange().authenticated();
http.oauth2ResourceServer().jwt();
// Allow showing /home within a frame
http.headers().frameOptions().mode(Mode.SAMEORIGIN);
// Disable CSRF in the gateway to prevent conflicts with proxied service CSRF
http.csrf().disable();
return http.build();
}
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