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禁止 Tomcat 上的 HTTP 方法区分大小写吗？

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禁止 Tomcat 上的 HTTP 方法区分大小写吗？

我已将以下内容放入我的应用程序的 web.xml 中，以尝试禁止 PUT、DELETE 等操作：

 <security-constraint>
 <web-resource-collection>
  <web-resource-name>restricted methods</web-resource-name>
  <url-pattern>/*</url-pattern>
  <http-method>DELETE</http-method>
  <http-method>PUT</http-method>
  <http-method>SEARCH</http-method>
  <http-method>COPY</http-method>
  <http-method>MOVE</http-method>
  <http-method>PROPFIND</http-method>
  <http-method>PROPPATCH</http-method>
  <http-method>MKCOL</http-method>
  <http-method>LOCK</http-method>
  <http-method>UNLOCK</http-method>
  <http-method>delete</http-method>
  <http-method>put</http-method>
  <http-method>search</http-method>
  <http-method>copy</http-method>
  <http-method>move</http-method>
  <http-method>propfind</http-method>
  <http-method>proppatch</http-method>
  <http-method>mkcol</http-method>
  <http-method>lock</http-method>
  <http-method>unlock</http-method>
 </web-resource-collection>
 <auth-constraint />
 </security-constraint>

好的，现在：

如果我使用的方法发出请求，DELETE我会得到 403 返回。

如果我使用的方法发出请求，delete我会得到 403 返回。

但

如果我使用的方法提出请求，DeLeTe我会得到 OK！

我怎样才能让它禁止这些不区分大小写？

编辑：我正在用 C# 程序测试它：

    private void button1_Click(object sender, EventArgs e)
    {
        textBox1.Text = "making request";
        System.Threading.Thread.Sleep(400);
        WebRequest req = WebRequest.Create("http://serverurl/Application/cache_test.jsp");
        req.Method = txtMethod.Text;
        try
        {
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

            textBox1.Text = "Status: " + resp.StatusCode;

            if (resp.StatusCode == System.Net.HttpStatusCode.OK)
            {
                WebHeaderCollection header = resp.Headers;
                using (System.IO.StreamReader reader = new System.IO.StreamReader(resp.GetResponseStream(), ASCIIEncoding.ASCII))
                {
                    //string responseText = reader.ReadToEnd();
                    textBox1.Text += "\r\n" + reader.ReadToEnd();
                }
            }
        }
        catch (Exception ex)
        {
            textBox1.Text = ex.Message;
        }
    }

txtMethod.Text是一个文本框，我在其中输入方法名称。当出现 403 时，会引发异常，该异常会被 catch 块捕获。

cache_test.jsp包含：

<%
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
response.setHeader("Pragma","no-cache");

out.print("Method used was: "+request.getMethod());
%>

答案1

无论 Tomcat 相对于 HTTP 标准的不正确行为如何，您都应该使用白名单来允许特定方法，而不是使用黑名单。

例如，以下白名单将阻止除以下方法之外的所有方法区分大小写 GET和HEAD。

<security-constraint>
    <web-resource-collection>
        <web-resource-name>restricted methods</web-resource-name>
        <url-pattern>/*</url-pattern>
        <http-method-omission>GET</http-method-omission>
        <http-method-omission>HEAD</http-method-omission>
    </web-resource-collection>
    <auth-constraint />
</security-constraint>

（注意：需要 Tomcat 7+。使用旧版本的用户必须研究其他解决方案，例如 servlet 过滤器。）

参考

答案2

好吧，在对一些在其 HTTP 回复中保存标头签名的随机服务器进行快速测试后Server: Apache-Coyotte，似乎您是对的，因为get / HTTP/1.1\r\nHost: <target_IP>\r\n\r\n每次使用简单的 netcat 连接发送都有效，而应该收到 400 HTTP 代码。

例如 ：

$ { echo -en "get / HTTP/1.1\r\nHost: <target_IP>:8080\r\n\r\n" ; } | nc <target_IP> 8080

01:14:58.095547 IP 192.168.1.3.57245 > <target_IP>.8080: Flags [P.], seq 1:42, ack 1, win 115, options [nop,nop,TS val 4294788321 ecr 0], length 41
E..]C.@[email protected].......
..D.....get / HTTP/1.1
Host: <target_IP>:8080

[...]

01:14:58.447946 IP <target_IP>.8080 > 192.168.1.3.57245: Flags [.], seq 1:1409, ack 43, win 65494, options [nop,nop,TS val 7981294 ecr 4294787971], length 1408
E...f...i.....p.............A..............
.y....C.HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=ISO-8859-1
Transfer-Encoding: chunked
Date: Tue, 27 Jan 2015 00:15:14 GMT

我必须说我在这里有点震惊，并且我不会惊讶地看到这种行为在这种情况下扩展到所有 HTTP/1.1 方法。

您应该填写错误报告他们的错误跟踪工具并发送邮件至相应的邮件列表因为这是对 RFC 2616 的严重违反（见下文），会产生严重后果。

5.1.1 方法

  The Method  token indicates the method to be performed on the
  resource identified by the Request-URI. The method is case-sensitive.

      Method         = "OPTIONS"                ; Section 9.2
                     | "GET"                    ; Section 9.3
                     | "HEAD"                   ; Section 9.4
                     | "POST"                   ; Section 9.5
                     | "PUT"                    ; Section 9.6
                     | "DELETE"                 ; Section 9.7
                     | "TRACE"                  ; Section 9.8
                     | "CONNECT"                ; Section 9.9
                     | extension-method
      extension-method = token

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