Spring Security：将具有角色的OAuth2声明映射到安全的资源服务器端点

Question

我正在使用Spring Boot设置资源服务器，并使用Spring Security提供的OAuth2保护端点。因此，我使用的是Spring Boot 2.1.8.RELEASE，例如使用Spring Security 5.1.6.RELEASE。

作为授权服务器，我正在使用Keycloak。身份验证，颁发访问令牌和对资源服务器中的令牌进行验证之间的所有过程均正常运行。这是一个已发行和已解码令牌的示例（其中一些部分被删减）：

{
  "jti": "5df54cac-8b06-4d36-b642-186bbd647fbf",
  "exp": 1570048999,
  "aud": [
    "myservice",
    "account"
  ],
  "azp": "myservice",
  "realm_access": {
    "roles": [
      "offline_access",
      "uma_authorization"
    ]
  },
  "resource_access": {
    "myservice": {
      "roles": [
        "ROLE_user",
        "ROLE_admin"
      ]
    },
    "account": {
      "roles": [
        "manage-account",
        "manage-account-links",
        "view-profile"
      ]
    }
  },
  "scope": "openid email offline_access microprofile-jwt profile address phone",
}

我如何配置Spring Security以使用访问令牌中的信息为不同的端点提供条件授权？

最终我想编写一个像这样的控制器：

@RestController
public class Controller {

    @Secured("ROLE_user")
    @GetMapping("userinfo")
    public String userinfo() {
        return "not too sensitive action";
    }

    @Secured("ROLE_admin")
    @GetMapping("administration")
    public String administration() {
        return "TOOOO sensitive action";
    }
}

Answer 1

经过一番混乱之后，我找到了一个实现自定义jwtAuthenticationConverter的解决方案，该解决方案可以将特定于资源的角色附加到授权机构集合中。

    http.oauth2ResourceServer()
                .jwt()
                .jwtAuthenticationConverter(new JwtAuthenticationConverter()
                {
                    @Override
                    protected Collection<GrantedAuthority> extractAuthorities(final Jwt jwt)
                    {
                        Collection<GrantedAuthority> authorities = super.extractAuthorities(jwt);
                        Map<String, Object> resourceAccess = jwt.getClaim("resource_access");
                        Map<String, Object> resource = null;
                        Collection<String> resourceRoles = null;
                        if (resourceAccess != null &&
                            (resource = (Map<String, Object>) resourceAccess.get("my-resource-id")) !=
                            null && (resourceRoles = (Collection<String>) resource.get("roles")) != null)
                            authorities.addAll(resourceRoles.stream()
                                                            .map(x -> new SimpleGrantedAuthority("ROLE_" + x))
                                                            .collect(Collectors.toSet()));
                        return authorities;
                    }
                });

其中my-resource-id既是resource_access声明中显示的资源标识符，又是ResourceServerSecurityConfigurer中与API关联的值。

注意extractAuthorities实际上已被弃用，因此应采用成熟的转换器来实现更面向未来的解决方案

    import org.springframework.core.convert.converter.Converter;
    import org.springframework.security.authentication.AbstractAuthenticationToken;
    import org.springframework.security.core.GrantedAuthority;
    import org.springframework.security.core.authority.SimpleGrantedAuthority;
    import org.springframework.security.oauth2.jwt.Jwt;
    import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationToken;
    import org.springframework.security.oauth2.server.resource.authentication.JwtGrantedAuthoritiesConverter;

    import java.util.Collection;
    import java.util.Collections;
    import java.util.Map;
    import java.util.stream.Collectors;
    import java.util.stream.Stream;

    public class CustomJwtAuthenticationConverter implements Converter<Jwt, AbstractAuthenticationToken>
    {
        private static Collection<? extends GrantedAuthority> extractResourceRoles(final Jwt jwt, final String resourceId)
        {
            Map<String, Object> resourceAccess = jwt.getClaim("resource_access");
            Map<String, Object> resource;
            Collection<String> resourceRoles;
            if (resourceAccess != null && (resource = (Map<String, Object>) resourceAccess.get(resourceId)) != null &&
                (resourceRoles = (Collection<String>) resource.get("roles")) != null)
                return resourceRoles.stream()
                                    .map(x -> new SimpleGrantedAuthority("ROLE_" + x))
                                    .collect(Collectors.toSet());
            return Collections.emptySet();
        }

        private final JwtGrantedAuthoritiesConverter defaultGrantedAuthoritiesConverter = new JwtGrantedAuthoritiesConverter();

        private final String resourceId;

        public CustomJwtAuthenticationConverter(String resourceId)
        {
            this.resourceId = resourceId;
        }

        @Override
        public AbstractAuthenticationToken convert(final Jwt source)
        {
            Collection<GrantedAuthority> authorities = Stream.concat(defaultGrantedAuthoritiesConverter.convert(source)
                                                                                                       .stream(),
                                                                     extractResourceRoles(source, resourceId).stream())
                                                             .collect(Collectors.toSet());
            return new JwtAuthenticationToken(source, authorities);
        }
    }

[我已经使用Spring Boot 2.1.9.RELEASE，Spring Security 5.2.0.RELEASE和官方Keycloak 7.0.0 Docker镜像测试了这两种解决方案。

一般来说，我想无论实际的授权服务器（即IdentityServer4，Keycloak ...），这似乎都是将声明转换为Spring Security授予的适当位置。