前文

CSRF攻击和漏洞的参考文章：

http://www.cnblogs.com/hyddd/archive/2009/04/09/1432744.html

Laravel默认是开启了CSRF功能，需要关闭此功能有两种方法：

方法一

打开文件：app\Http\Kernel.php

把这行注释掉：

'App\Http\Middleware\VerifyCsrfToken'

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方法二

打开文件：app\Http\Middleware\VerifyCsrfToken.php

修改为：

<span style="color: #000000;">php namespace App\Http\Middleware;

</span><span style="color: #0000ff;">use</span><span style="color: #000000;"> Closure;
</span><span style="color: #0000ff;">use</span> Illuminate\Foundation\Http\Middleware\VerifyCsrfToken <span style="color: #0000ff;">as</span><span style="color: #000000;"> BaseVerifier;

</span><span style="color: #0000ff;">class</span> VerifyCsrfToken <span style="color: #0000ff;">extends</span><span style="color: #000000;"> BaseVerifier {

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> handle(<span style="color: #800080;">$request</span>, Closure <span style="color: #800080;">$next</span><span style="color: #000000;">)
    {
        </span><span style="color: #008000;">//</span><span style="color: #008000;"> 使用CSRF
        //return parent::handle($request, $next);
        // 禁用CSRF</span>
        <span style="color: #0000ff;">return</span> <span style="color: #800080;">$next</span>(<span style="color: #800080;">$request</span><span style="color: #000000;">);
    }

}</span>

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CSRF的使用有两种，一种是在HTML的代码中加入：

<span style="color: #0000ff;"><span style="color: #800000;">input </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="hidden"</span><span style="color: #ff0000;"> name</span><span style="color: #0000ff;">="_token"</span><span style="color: #ff0000;"> value</span><span style="color: #0000ff;">="{{ csrf_token() }}"</span> <span style="color: #0000ff;">/></span></span>

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另一种是使用cookie方式。

使用cookie方式，需要把app\Http\Middleware\VerifyCsrfToken.php修改为：

<span style="color: #000000;">php namespace App\Http\Middleware;

</span><span style="color: #0000ff;">use</span><span style="color: #000000;"> Closure;
</span><span style="color: #0000ff;">use</span> Illuminate\Foundation\Http\Middleware\VerifyCsrfToken <span style="color: #0000ff;">as</span><span style="color: #000000;"> BaseVerifier;

</span><span style="color: #0000ff;">class</span> VerifyCsrfToken <span style="color: #0000ff;">extends</span><span style="color: #000000;"> BaseVerifier {

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> handle(<span style="color: #800080;">$request</span>, Closure <span style="color: #800080;">$next</span><span style="color: #000000;">)
    {
        </span><span style="color: #0000ff;">return</span> parent::addCookieToResponse(<span style="color: #800080;">$request</span>, <span style="color: #800080;">$next</span>(<span style="color: #800080;">$request</span><span style="color: #000000;">));
    }

}</span>

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使用cookie方式的CSRF，可以不用在每个页面都加入这个input的hidden标签。

当然，也可以对指定的表单提交方式使用CSRF，如：

<span style="color: #000000;">php namespace App\Http\Middleware;

</span><span style="color: #0000ff;">use</span><span style="color: #000000;"> Closure;
</span><span style="color: #0000ff;">use</span> Illuminate\Foundation\Http\Middleware\VerifyCsrfToken <span style="color: #0000ff;">as</span><span style="color: #000000;"> BaseVerifier;

</span><span style="color: #0000ff;">class</span> VerifyCsrfToken <span style="color: #0000ff;">extends</span><span style="color: #000000;"> BaseVerifier {

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> handle(<span style="color: #800080;">$request</span>, Closure <span style="color: #800080;">$next</span><span style="color: #000000;">)
    {
        </span><span style="color: #008000;">//</span><span style="color: #008000;"> Add this:</span>
        <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$request</span>->method() == 'POST'<span style="color: #000000;">)
        {
            </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$next</span>(<span style="color: #800080;">$request</span><span style="color: #000000;">);
        }
        
        </span><span style="color: #0000ff;">if</span> (<span style="color: #800080;">$request</span>->method() == 'GET' || <span style="color: #800080;">$this</span>->tokensMatch(<span style="color: #800080;">$request</span><span style="color: #000000;">))
        {
            </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$next</span>(<span style="color: #800080;">$request</span><span style="color: #000000;">);
        }
        </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span><span style="color: #000000;"> TokenMismatchException;
    }

}</span>

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只对GET的方式提交使用CSRF，对POST方式提交表单禁用CSRF