apache shiro：如何使用 spring applicationcontext 设置 authenticationStrategy？

Question

我一直在努力在基于 Spring 的 Web 应用程序中使用 shiro 1.2.1 进行 authenticationStrategy 设置。我有2个领域。一种针对database 进行身份验证，另一种针对ldap 进行身份验证。两个realms 工作正常，只是我想要一个FirstSuccessfulStrategy，但似乎两个领域仍在被调用。这是我的安全应用程序上下文：

<bean id="passwordService" class="org.apache.shiro.authc.credential.DefaultPasswordService">
    <property name="hashService" ref="hashService" />

</bean>

<bean id="hashService" class="org.apache.shiro.crypto.hash.DefaultHashService">
    <property name="hashAlgorithmName" value="SHA-512" />
    <property name="hashIterations" value="500000" />
</bean>


<bean id="SaltedSha512JPARealm" class="bla.bla.webapp.security.SaltedSha512JPARealm">
    <property name="credentialsMatcher">
        <bean class="org.apache.shiro.authc.credential.PasswordMatcher">
            <property name="passwordService" ref="passwordService"/>
        </bean>
    </property>

</bean>


<bean id="ldapContextFactory" class="org.apache.shiro.realm.ldap.JndiLdapContextFactory">
    <property name="url" value="${user.ldap.connection.url}"/>
    <property name="authenticationMechanism" value="${user.ldap.connection.auth_mecanism}"/>
</bean>

<bean id="ldapRealm" class="bla.bla.webapp.security.LDAPRealm">
    <property name="userDnTemplate" value="${user.ldap.connection.userDnTemplate}"/>
    <property name="contextFactory" ref="ldapContextFactory" />

</bean>

<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager" depends-on="roleRepository,roleRightRepository,rightRepository,userRepository">

    <property name="realms">
        <list>
            <ref local="ldapRealm"/>
            <ref local="SaltedSha512JPARealm"/>
        </list>
    </property>
    <property name="authenticator.authenticationStrategy">
        <bean class="org.apache.shiro.authc.pam.FirstSuccessfulStrategy"/>
    </property>

</bean>

有什么我做得不好的地方吗？

Answer 1

FirstSuccessfulStrategy 表示您的身份验证器将尝试您的所有领域来对用户进行身份验证，直到第一次成功。您的领域已按顺序配置：ldapRealm、SaltedSha512JPARealm。因此，如果lapRealm 失败，验证器将尝试第二个。要解决这个问题，您可以尝试将最成功或最快的领域配置为第一，例如您可以将您的领域顺序更改为SaltedSha512JPARealm、ldapRealm：

<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager" depends-on="roleRepository,roleRightRepository,rightRepository,userRepository">

    <property name="realms">
        <list>
            <ref local="SaltedSha512JPARealm"/>
            <ref local="ldapRealm"/>
        </list>
    </property>
    <property name="authenticator.authenticationStrategy">
        <bean class="org.apache.shiro.authc.pam.FirstSuccessfulStrategy"/>
    </property>

</bean>

但是你应该明白，对于这个配置，如果SaltedSha512JPARealm会失败，验证器会尝试ldapRealm。

或者您可以尝试为该领域使用不​​同的令牌类。但它只有在您对它们每个都有不同的身份验证入口点时才有效。

UPD

似乎ModularRealmAuthenticator 的设计使其始终尝试通过所有领域对用户进行身份验证。 FirstSuccessfulStrategy 只能影响认证结果。它将首先返回成功的AuthenticationInfo。要实现您的目标，您需要覆盖 ModularRealmAuthenticator#doMultiRealmAuthentication 方法。它可能看起来像这样：

protected AuthenticationInfo doMultiRealmAuthentication(Collection<Realm> realms, AuthenticationToken token) {
    AuthenticationStrategy strategy = getAuthenticationStrategy();
    AuthenticationInfo aggregate = strategy.beforeAllAttempts(realms, token);
    if (log.isTraceEnabled()) {
        log.trace("Iterating through {} realms for PAM authentication", realms.size());
    }
    for (Realm realm : realms) {
        aggregate = strategy.beforeAttempt(realm, token, aggregate);
        if (realm.supports(token)) {
            log.trace("Attempting to authenticate token [{}] using realm [{}]", token, realm);
            AuthenticationInfo info = null;
            Throwable t = null;
            try {
                info = realm.getAuthenticationInfo(token);
            } catch (Throwable throwable) {
                t = throwable;
                if (log.isDebugEnabled()) {
                    String msg = "Realm [" + realm + "] threw an exception during a multi-realm authentication attempt:";
                    log.debug(msg, t);
                }
            }
            aggregate = strategy.afterAttempt(realm, token, info, aggregate, t);
            // dirty dirty hack
            if (aggregate != null && !CollectionUtils.isEmpty(aggregate.getPrincipals())) {
                return aggregate;
            }
            // end dirty dirty hack
        } else {
            log.debug("Realm [{}] does not support token {}.  Skipping realm.", realm, token);
        }
    }
    aggregate = strategy.afterAllAttempts(token, aggregate);
    return aggregate;
}

Answer 2

<property name="authenticator.authenticationStrategy">
    <bean class="org.apache.shiro.authc.pam.FirstSuccessfulStrategy"/>
</property>

上面的定义是错误的。定义如下

<property name="authenticator.authenticationStrategy" ref="authcStrategy"/>

并分别定义下面的bean定义

<bean id="authcStrategy"     class="org.apache.shiro.authc.pam.FirstSuccessfulStrategy"/>

然后它会按预期工作