如何在Spring LDAP中添加LDAP缓存？

Question

我想在本地缓存LDAP用户数据以允许更快的查询.Spring LDAP提供了这样的功能吗？我怎样才能做到这一点？

我使用Spring Security 3.1和Spring LDAP 1.3.1进行身份验证和授权.如果存在,使用内置机制为LDAP建立缓存会很好.

Spring LDAP配置:

的applicationContext-ldap.xml:

<?xml  version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/jee
        http://www.springframework.org/schema/jee/spring-jee.xsd
    ">

    <!-- Ldap -->
    <jee:jndi-lookup id="ldapUrl" jndi-name="appName/ldapUrl" expected-type="java.lang.String" />
    <jee:jndi-lookup id="ldapUser" jndi-name="appName/ldapUser" expected-type="java.lang.String" />
    <jee:jndi-lookup id="ldapPassword" jndi-name="appName/ldapPassword" expected-type="java.lang.String" />

    <!-- for authentication and search purpose -->
    <bean id="ldapContextSource" class="org.springframework.ldap.core.support.LdapContextSource">
        <property name="url" ref="ldapUrl" />
        <property name="userDn" ref="ldapUser" />
        <property name="password" ref="ldapPassword" />
        <property name="pooled" value="true" />
    </bean>

    <bean id="ldapTemplate" class="org.springframework.ldap.core.LdapTemplate">
        <property name="contextSource" ref="ldapContextSource" />
    </bean>

    <!-- for pagination search purpose  -->
    <bean id="dirContext" factory-bean="ldapContextSource" factory-method="getReadOnlyContext" scope="session"/>

    <bean id="singleLdapContextSource" class="org.springframework.ldap.core.support.SingleContextSource" scope="session">
        <constructor-arg ref="dirContext"/>
    </bean>

    <bean id="singleLdapTemplate" class="org.springframework.ldap.core.LdapTemplate" scope="session">
        <property name="contextSource" ref="singleLdapContextSource" />
    </bean>

</beans>

Spring安全配置:

弹簧security.xml文件:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:security="http://www.springframework.org/schema/security"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/security 
        http://www.springframework.org/schema/security/spring-security-3.1.xsd">

    <!-- This is where we configure Spring-Security  -->
    <security:http
        auto-config="true"
        use-expressions="true"
        access-denied-page="/auth/denied"
    >
        <security:intercept-url pattern="/login" access="permitAll"/>
        <security:intercept-url pattern="/app/admin" access="permitAll"/>
        <security:intercept-url pattern="/app/common" access="hasRole('User')"/>
        <security:intercept-url pattern="/viol/home" access="permitAll"/>
        <security:intercept-url pattern="/app/users" access="permitAll"/>
        <security:intercept-url pattern="/admin/edit/*" access="hasRole('Administrator')"/>

        <security:form-login
                login-page="/auth/login" 
                authentication-failure-url="/auth/loginFailure" 
                default-target-url="/auth/authorize"/>

        <security:logout 
                invalidate-session="true" 
                logout-success-url="/auth/login"
                logout-url="/logout"/>
    </security:http>

    <security:authentication-manager>
        <security:ldap-authentication-provider
            server-ref="ldapContextSource"
            user-search-filter="(sAMAccountName={0})"
            user-search-base="dc=myDomain,dc=com"
         />
    </security:authentication-manager>
</beans>

非常感谢您的帮助!

Answer 1

我不认为 Spring 提供现成的客户端 LDAP 缓存，因为在客户端缓存 LDAP 查询结果会带来安全风险。缓存肯定会在某些时候保存过时的数据，如果它是用户的电子邮件/家庭地址，这并不是一个大问题，但当涉及到角色分配和其他身份验证/授权相关数据时，情况会更糟。通过扩展服务器端，使其能够处理负载，您的情况会好得多。

话虽这么说，从 Spring 3.1 开始引入缓存非常容易，因为它提供了出色的支持。LdapContextSource在您的情况下，使用如下所示的自定义就足够了：

public class CachingLdapContextSource extends AbstractContextSource {

    @Override
    protected DirContext getDirContextInstance(Hashtable environment) 
        throws NamingException 
    {
        InitialLdapContext context = new InitialLdapContext(environment, null);
        return new CachingDirContextWrapper(context);
    }
}

包装类只是将所有DirContext方法委托给底层实现，并装饰要使用@Cacheable.

class CachingDirContextWrapper implements DirContext {

    private final DirContext delegate;

    CachingDirContextWrapper(DirContext delegate) {
        this.delegate = delegate;
    }

    @Override
    @Cacheable(value = "search")
    public NamingEnumeration<SearchResult> search(...)
    {
        return delegate.search(name, matchingAttributes, attributesToReturn);
    }

    ...
}

有关如何配置 Spring 使用的缓存存储的详细信息，请参阅官方文档和本教程。

但我再次强调，你最好不要这样做。