How to access secured backend services when using Spring Integration with CAS? - spring-security

Question

I am seeking solutions to migrate current holistic system into microservices architecture. I want to use Spring Integration and Spring Security to integrate and secure the services. According to my understanding, to secure backend services is more like Single Sign On (SSO). I use Jasig CAS 4.2.7 (seems working fine with Spring Security) to authenticate users centrally, Spring Integration 4.2.11.RELEASE and Spring Security 4.0.4.RELEASE.
I have created a Maven project with two modules named web and service which are both web application. I deploy the three war files on same local Tomcat (version 7.0.36) and just add jimi and bob into CAS properties file to ensure them passing the authentication of CAS. When I try to access URL http://localhost:8080/prototype-integration-security-web/user, I got authenticated into front-end application but access forbidden on backend services.
The POM file looks as below.
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>prototype.integration.security</groupId>
<artifactId>prototype-integration-security</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<name>prototype-integration-security</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<warName>${project.name}</warName>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-http</artifactId>
<version>4.2.11.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>4.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.2.7.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jcl</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-security</artifactId>
<version>4.2.11.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>4.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-cas</artifactId>
<version>4.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.6.4</version>
</dependency>
</dependencies>
<modules>
<module>prototype-integration-security-web</module>
<module>prototype-integration-security-service</module>
</modules>
</project>
The deployment description files web.xml of two modules look same except the display name as following.
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="IntegrationSecurityWeb" version="3.0">
<display-name>Integration Security Web Prototype</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
In the Spring application context configuration file of web module, dispatcher-servlet.xml looks as below.
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:security="http://www.springframework.org/schema/security"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-http="http://www.springframework.org/schema/integration/http"
xmlns:int-security="http://www.springframework.org/schema/integration/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security.xsd
http://www.springframework.org/schema/integration
http://www.springframework.org/schema/integration/spring-integration-4.2.xsd
http://www.springframework.org/schema/integration/http
http://www.springframework.org/schema/integration/http/spring-integration-http-4.2.xsd
http://www.springframework.org/schema/integration/security
http://www.springframework.org/schema/integration/security/spring-integration-security-4.2.xsd">
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<constructor-arg>
<bean class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory">
<constructor-arg>
<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetClass" value="org.apache.http.impl.client.HttpClients"/>
<property name="targetMethod" value="createMinimal"/>
</bean>
</constructor-arg>
</bean>
</constructor-arg>
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
<bean class="org.springframework.http.converter.FormHttpMessageConverter">
</bean>
</list>
</property>
</bean>
<bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties">
<property name="service" value="http://localhost:8080/prototype-integration-security-web/login/cas" />
<property name="sendRenew" value="false" />
</bean>
<!-- Access voters -->
<bean id="accessDecisionManager" class="org.springframework.security.access.vote.AffirmativeBased">
<constructor-arg name="decisionVoters">
<list>
<bean class="org.springframework.security.access.vote.RoleHierarchyVoter">
<constructor-arg>
<bean class="org.springframework.security.access.hierarchicalroles.RoleHierarchyImpl">
<property name="hierarchy">
<value>
ROLE_ADMIN > ROLE_USER
</value>
</property>
</bean>
</constructor-arg>
</bean>
<bean class="org.springframework.security.access.vote.AuthenticatedVoter" />
</list>
</constructor-arg>
</bean>
<bean id="casEntryPoint" class="org.springframework.security.cas.web.CasAuthenticationEntryPoint">
<property name="loginUrl" value="https://localhost:8443/cas/login" />
<property name="serviceProperties" ref="serviceProperties" />
</bean>
<bean id="casFilter" class="org.springframework.security.cas.web.CasAuthenticationFilter">
<property name="authenticationManager" ref="authenticationManager" />
</bean>
<!-- This filter handles a Single Logout Request from the CAS Server -->
<bean id="singleLogoutFilter" class="org.jasig.cas.client.session.SingleSignOutFilter" />
<!-- This filter redirects to the CAS Server to signal Single Logout should be performed -->
<bean id="requestSingleLogoutFilter" class="org.springframework.security.web.authentication.logout.LogoutFilter">
<constructor-arg value="http://localhost:8080/cas/logout" />
<constructor-arg>
<bean class="org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler" />
</constructor-arg>
<property name="filterProcessesUrl" value="/logout/cas" />
</bean>
<security:http entry-point-ref="casEntryPoint" access-decision-manager-ref="accessDecisionManager" use-expressions="false">
<security:intercept-url pattern="/admin/**" access="ROLE_ADMIN" />
<security:intercept-url pattern="/**" access="ROLE_USER" />
<security:form-login />
<security:logout />
<security:custom-filter before="LOGOUT_FILTER" ref="requestSingleLogoutFilter"/>
<security:custom-filter before="CAS_FILTER" ref="singleLogoutFilter"/>
<security:custom-filter position="CAS_FILTER" ref="casFilter" />
</security:http>
<security:user-service id="userService">
<security:user name="jimi" password="jimi" authorities="ROLE_ADMIN" />
<security:user name="bob" password="bob" authorities="ROLE_USER" />
</security:user-service>
<bean id="casAuthenticationProvider" class="org.springframework.security.cas.authentication.CasAuthenticationProvider">
<property name="authenticationUserDetailsService">
<bean class="org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper">
<constructor-arg index="0" ref="userService" />
</bean>
</property>
<property name="serviceProperties" ref="serviceProperties" />
<property name="ticketValidator">
<bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator">
<constructor-arg index="0" value="https://localhost:8443/cas" />
</bean>
</property>
<property name="key" value="localCAS" />
</bean>
<security:authentication-manager alias="authenticationManager">
<security:authentication-provider ref="casAuthenticationProvider" />
</security:authentication-manager>
<int:channel-interceptor order="99">
<bean class="org.springframework.integration.security.channel.SecurityContextPropagationChannelInterceptor"/>
</int:channel-interceptor>
<task:executor id="pool" pool-size="5"/>
<int:poller id="poller" default="true" fixed-rate="1000"/>
<int-security:secured-channels>
<int-security:access-policy pattern="user*" send-access="ROLE_USER" />
<int-security:access-policy pattern="admin*" send-access="ROLE_ADMIN" />
</int-security:secured-channels>
<int-http:inbound-channel-adapter path="/user*" supported-methods="GET, POST" channel="userRequestChannel" />
<int:channel id="userRequestChannel">
<int:queue/>
</int:channel>
<int-http:outbound-channel-adapter url="http://localhost:8080/prototype-integration-security-service/query?ticket={ticket}"
http-method="GET"
rest-template="restTemplate"
channel="userRequestChannel">
<int-http:uri-variable name="ticket" expression="T(org.springframework.security.core.context.SecurityContextHolder).context.authentication.credentials"/>
</int-http:outbound-channel-adapter>
<int-http:inbound-channel-adapter path="/admin/callback*"
supported-methods="GET, POST"
channel="adminRequestChannel" />
<int:channel id="adminRequestChannel">
<int:queue/>
</int:channel>
<int:logging-channel-adapter id="logging" channel="adminRequestChannel" level="DEBUG" />
</beans>
In the context configuration file of service module, dispatcher-servlet.xml looks as following.
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:security="http://www.springframework.org/schema/security"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-http="http://www.springframework.org/schema/integration/http"
xmlns:int-security="http://www.springframework.org/schema/integration/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security.xsd
http://www.springframework.org/schema/integration
http://www.springframework.org/schema/integration/spring-integration-4.2.xsd
http://www.springframework.org/schema/integration/http
http://www.springframework.org/schema/integration/http/spring-integration-http-4.2.xsd
http://www.springframework.org/schema/integration/security
http://www.springframework.org/schema/integration/security/spring-integration-security-4.2.xsd">
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<constructor-arg>
<bean class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory">
<constructor-arg>
<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetClass" value="org.apache.http.impl.client.HttpClients"/>
<property name="targetMethod" value="createMinimal"/>
</bean>
</constructor-arg>
</bean>
</constructor-arg>
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
<bean class="org.springframework.http.converter.FormHttpMessageConverter">
</bean>
</list>
</property>
</bean>
<bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties">
<property name="service" value="http://localhost:8080/prototype-integration-security-service/login/cas" />
<property name="sendRenew" value="false" />
</bean>
<!-- Access voters -->
<bean id="accessDecisionManager" class="org.springframework.security.access.vote.AffirmativeBased">
<constructor-arg name="decisionVoters">
<list>
<bean class="org.springframework.security.access.vote.RoleHierarchyVoter">
<constructor-arg>
<bean class="org.springframework.security.access.hierarchicalroles.RoleHierarchyImpl">
<property name="hierarchy">
<value>
ROLE_ADMIN > ROLE_USER
</value>
</property>
</bean>
</constructor-arg>
</bean>
<bean class="org.springframework.security.access.vote.AuthenticatedVoter" />
<!-- <bean class="org.springframework.security.web.access.expression.WebExpressionVoter" /> -->
</list>
</constructor-arg>
</bean>
<bean id="casEntryPoint" class="org.springframework.security.cas.web.CasAuthenticationEntryPoint">
<property name="loginUrl" value="https://localhost:8443/cas/login" />
<property name="serviceProperties" ref="serviceProperties" />
</bean>
<bean id="casFilter" class="org.springframework.security.cas.web.CasAuthenticationFilter">
<property name="authenticationManager" ref="authenticationManager" />
</bean>
<!-- This filter handles a Single Logout Request from the CAS Server -->
<bean id="singleLogoutFilter" class="org.jasig.cas.client.session.SingleSignOutFilter" />
<!-- This filter redirects to the CAS Server to signal Single Logout should be performed -->
<bean id="requestSingleLogoutFilter" class="org.springframework.security.web.authentication.logout.LogoutFilter">
<constructor-arg value="https://localhost:8443/cas/logout" />
<constructor-arg>
<bean class="org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler" />
</constructor-arg>
<property name="filterProcessesUrl" value="/logout/cas" />
</bean>
<security:http entry-point-ref="casEntryPoint" access-decision-manager-ref="accessDecisionManager" use-expressions="false">
<security:intercept-url pattern="/**" access="ROLE_ADMIN"/>
<security:form-login />
<security:logout />
<security:custom-filter before="LOGOUT_FILTER" ref="requestSingleLogoutFilter"/>
<security:custom-filter before="CAS_FILTER" ref="singleLogoutFilter"/>
<security:custom-filter position="CAS_FILTER" ref="casFilter" />
</security:http>
<security:user-service id="userService">
<security:user name="jimi" password="jimi" authorities="ROLE_ADMIN" />
<security:user name="bob" password="bob" authorities="ROLE_USER" />
</security:user-service>
<bean id="casAuthenticationProvider" class="org.springframework.security.cas.authentication.CasAuthenticationProvider">
<property name="authenticationUserDetailsService">
<bean class="org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper">
<constructor-arg index="0" ref="userService" />
</bean>
</property>
<property name="serviceProperties" ref="serviceProperties" />
<property name="ticketValidator">
<bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator">
<constructor-arg index="0" value="https://localhost:8443/cas" />
</bean>
</property>
<property name="key" value="localCAS" />
</bean>
<security:authentication-manager alias="authenticationManager">
<security:authentication-provider ref="casAuthenticationProvider" />
</security:authentication-manager>
<int:channel-interceptor order="99">
<bean class="org.springframework.integration.security.channel.SecurityContextPropagationChannelInterceptor"/>
</int:channel-interceptor>
<task:executor id="pool" pool-size="5"/>
<int:poller id="poller" default="true" fixed-rate="1000"/>
<int-security:secured-channels>
<int-security:access-policy pattern=".*" send-access="ROLE_ADMIN" />
</int-security:secured-channels>
<int-http:inbound-channel-adapter path="/query*" supported-methods="GET, POST" channel="requestChannel" />
<int:channel id="requestChannel">
<int:queue/>
</int:channel>
<int-http:outbound-channel-adapter url="http://localhost:8080/prototype-integration-security-web/admin/callback?ticket={ticket}"
http-method="GET"
rest-template="restTemplate"
channel="requestChannel">
<int-http:uri-variable name="ticket" expression="T(org.springframework.security.core.context.SecurityContextHolder).context.authentication.credentials" />
</int-http:outbound-channel-adapter>
</beans>
No additional code is required, this is why I am fond of Spring Integration. Did I do anything wrong or miss some configurations? Please share your ideas, opinions and suggestions. Thanks in advance.

Answer 1

I have never used CAS before, but looks like you don't share how you get headers.serviceTicket.
I think you idea to propagate ticket via URL param is good, but first of all we have to extract it from the incoming URL:
Upon successful login, CAS will redirect the user’s browser back to the original service. It will also include a ticket parameter, which is an opaque string representing the "service ticket". Continuing our earlier example, the URL the browser is redirected to might be https://server3.company.com/webapp/login/cas?ticket=ST-0-ER94xMJmn6pha35CQRoZ.
http://docs.spring.io/spring-security/site/docs/4.2.0.RELEASE/reference/htmlsingle/#cas
For this purpose we can do like this:
<int-http:inbound-channel-adapter path="/user*" supported-methods="GET, POST" channel="userRequestChannel">
<int-http:header name="serviceTicket" expression="#requestParams.ticket"/>
</int-http:inbound-channel-adapter>
Otherwise, please, share exception on the matter and try to trace network traffic to determine a gap.
UPDATE
According to the description on that Spring Security page for CAS we have:
... The principal will be equal to CasAuthenticationFilter.CAS_STATEFUL_IDENTIFIER, whilst the credentials will be the service ticket opaque value...
So, looks like we don't need to worry about request param in the <int-http:inbound-channel-adapter> and just rely on the SecurityContext in the <int-http:outbound-gateway>:
<int-http:uri-variable name="ticket"
expression="T(org.springframework.security.core.context.SecurityContextHolder).context.authentication.credentials"/>