"Access is denied (user is not anonymous)" with spring-security-oauth2 - spring-security

Question

I'm new to Spring Security and Oauth, and I'm trying to set up a simple example protecting the access to resources in path "/api" with Oauth2. I'm using spring-security-oauth2-1.0.0.RC2. After some time dealing with configuration, I'm able to get tokens, but when I try to send requests to "/api" resources, I'm facing two questions:
Initially, I'm sending authorization header with "OAuth2" prefix, but spring-security-oauth2 seems to need headers with "Bearer" prefix in the tokens to find them. What's the difference between these tokens?
After Spring validated the token, I'm getting a security error: "ExceptionTranslationFilter - Access is denied (user is not anonymous)" and I'm stuck with this problem. Since I'm using InMemory token store, I have to login each time to authorize client, then I'm getting this error. Here is the spring configuration:
<http pattern="/api/**" create-session="never" entry-point-ref="oauthAuthenticationEntryPoint"
access-decision-manager-ref="accessDecisionManager" xmlns="http://www.springframework.org/schema/security">
<anonymous enabled="false" />
<intercept-url pattern="/api/**" access="ROLE_CLIENT,SCOPE_READ" />
<custom-filter ref="resourceServerFilter" before="PRE_AUTH_FILTER" />
<access-denied-handler ref="oauthAccessDeniedHandler" />
</http>
<http disable-url-rewriting="true" xmlns="http://www.springframework.org/schema/security">
<intercept-url pattern="/oauth/**" access="ROLE_USER" />
<!--intercept-url pattern="/**" access="IS_AUTHENTICATED_ANONYMOUSLY" /-->
<form-login/>
<logout logout-success-url="/index.jsp" logout-url="/logout" />
</http>
<bean id="oauthAuthenticationEntryPoint" class="org.springframework.security.oauth2.provider.error.OAuth2AuthenticationEntryPoint">
<property name="realmName" value="O2Server" />
</bean>
<bean id="oauthAccessDeniedHandler" class="org.springframework.security.oauth2.provider.error.OAuth2AccessDeniedHandler" />
<bean id="clientCredentialsTokenEndpointFilter" class="org.springframework.security.oauth2.provider.client.ClientCredentialsTokenEndpointFilter">
<property name="authenticationManager" ref="clientAuthenticationManager" />
</bean>
<bean id="accessDecisionManager" class="org.springframework.security.access.vote.UnanimousBased" xmlns="http://www.springframework.org/schema/beans">
<constructor-arg>
<list>
<bean class="org.springframework.security.oauth2.provider.vote.ScopeVoter" />
<bean class="org.springframework.security.access.vote.RoleVoter" />
<bean class="org.springframework.security.access.vote.AuthenticatedVoter" />
</list>
</constructor-arg>
</bean>
<authentication-manager id="clientAuthenticationManager" xmlns="http://www.springframework.org/schema/security">
<authentication-provider user-service-ref="clientDetailsUserService" />
</authentication-manager>
<authentication-manager alias="authenticationManager" xmlns="http://www.springframework.org/schema/security">
<authentication-provider>
<user-service>
<user name="test" password="test" authorities="ROLE_USER" />
</user-service>
</authentication-provider>
</authentication-manager>
<bean id="clientDetailsUserService" class="org.springframework.security.oauth2.provider.client.ClientDetailsUserDetailsService">
<constructor-arg ref="clientDetails" />
</bean>
<bean id="tokenStore" class="org.springframework.security.oauth2.provider.token.InMemoryTokenStore" />
<bean id="tokenServices" class="org.springframework.security.oauth2.provider.token.DefaultTokenServices">
<property name="tokenStore" ref="tokenStore" />
<property name="supportRefreshToken" value="true" />
<property name="clientDetailsService" ref="clientDetails"/>
</bean>
<bean id="userApprovalHandler" class="org.o2server.security.O2ServerUserApprovalHandler">
<property name="tokenServices" ref="tokenServices" />
</bean>
<oauth:authorization-server client-details-service-ref="clientDetails" token-services-ref="tokenServices" user-approval-handler-ref="userApprovalHandler">
<oauth:authorization-code />
<oauth:implicit />
<oauth:refresh-token />
<oauth:client-credentials />
<oauth:password />
</oauth:authorization-server>
<oauth:resource-server id="resourceServerFilter" resource-id="O2Server" token-services-ref="tokenServices" />
<oauth:client-details-service id="clientDetails">
<oauth:client client-id="O2Client" resource-ids="O2Server" authorized-grant-types="authorization_code,refresh_token,implicit"
authorities="ROLE_CLIENT" scope="read,write" secret="secret" />
</oauth:client-details-service>
<oauth:web-expression-handler id="oauthWebExpressionHandler" />
This is the log from the server:
11:58:30.366 [DEBUG] FilterSecurityInterceptor - Secure object: FilterInvocation: URL: /api/user/; Attributes: [ROLE_CLIENT, SCOPE_READ]
11:58:30.366 [DEBUG] FilterSecurityInterceptor - Previously Authenticated: org.springframework.security.oauth2.provider.OAuth2Authentication#48a94464: Principal: org.springframework.security.core.userdetails.User#346448: Username: paul; Password: [PROTECTED]; Enabled: true; AccountNonExpired: true; credentialsNonExpired: true; AccountNonLocked: true; Granted Authorities: ROLE_USER; Credentials: [PROTECTED]; Authenticated: true; Details: org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails#43794494; Granted Authorities: ROLE_USER
11:58:30.366 [DEBUG] UnanimousBased - Voter: org.springframework.security.oauth2.provider.vote.ScopeVoter#4e857327, returned: 0
11:58:30.366 [DEBUG] UnanimousBased - Voter: org.springframework.security.access.vote.RoleVoter#1b4b2db7, returned: -1
11:58:30.367 [DEBUG] ExceptionTranslationFilter - Access is denied (user is not anonymous); delegating to AccessDeniedHandler <org.springframework.security.access.AccessDeniedException: Access is denied>org.springframework.security.access.AccessDeniedException: Access is denied
at org.springframework.security.access.vote.UnanimousBased.decide(UnanimousBased.java:90)
Please, could you give me some advice?
Thank you in advance.

Answer 1

I have never used oauth plugin but from reading debug output I can say that RoleVoter returned -1, which means access was denied by DecisionVoter. I see that you granted only ROLE_USER to principal which is trying to access url /api/user/, which is secured by [ROLE_CLIENT, SCOPE_READ] and that's the reason why access was denied.
Either grant ROLE_CLIENT and SCOPE_READ to principal or change <intercept-url pattern="/api/**" access="ROLE_CLIENT,SCOPE_READ" />.

Answer 2

As Xaerxess said, you should change your intercept-url access property to ROLE_USER.
<intercept-url pattern="/api/**" access="ROLE_CLIENT,SCOPE_READ" />
to
<intercept-url pattern="/api/**" access="ROLE_USER,SCOPE_READ" />
The access property controls the role of the user (which the client acts on behalf of).
The documentation of the authorities (ROLE_CLIENT) property of tag <oauth:client> states:
Authorities that are granted to the client (comma-separated). Distinct
from the authorities granted to the user on behalf of whom the client
is acting.
Also, according to user Dave Syer:
If you didn't change Tonr, it is not acting as a client, it is acting
on behalf of a user (who will not have the required ROLE_CLIENT), so
it is expected that you would get a 403. If you want to make an
assertion about the request from tonr being from a client with a
specific role (without changing the app) you can use an expression,
e.g. "oauthClientHasRole('ROLE_CLIENT') and hasScope('trust')".
Source:
http://forum.springsource.org/showthread.php?125468-confusing-between-ROLE_USER-ROLE_CLIENT