我有两个网站，比如说example.com和anotherexample.net。
在anotherexample.net/page.html上，我有一个IFRAME SRC=“http://example.com/someform.asp”。IFRAME显示一个表单供用户填写并提交到http://example.com/process.asp。当我在它自己的浏览器窗口中打开表单(“someform.asp”)时，一切正常。
然而，当我在ie6或ie7中加载someform.asp作为IFRAME时，example.com的cookie没有保存。在Firefox中，这个问题不会出现。
出于测试目的，我在http://newmoon.wz.cz/test/page.php上创建了一个类似的设置。
example.com使用基于cookie的会话(对此我无能为力)，因此如果没有cookie, process.asp将无法执行。我如何迫使IE保存这些cookie ?
嗅探HTTP流量的结果:在GET /someform.asp响应中，有一个有效的每会话Set-Cookie报头(例如Set-Cookie: ASPKSJIUIUGF=JKHJUHVGFYTTYFY)，但在POST /process.asp请求中，根本没有Cookie报头。
Edit3:一些AJAX+服务器端脚本显然能够避开这个问题，但这看起来非常像一个bug，而且它还打开了一组全新的安全漏洞。我不希望我的应用程序使用漏洞+安全漏洞的组合只是因为它很容易。
编辑:P3P政策是根本原因，详细解释如下。
我花了一天的大部分时间研究P3P的事情，我觉得有必要分享我的发现。
我注意到P3P概念已经非常过时了，似乎只有IE (Internet Explorer)才真正使用/实施。
最简单的解释是:IE希望您在使用cookie时定义P3P报头。
这是一个很好的想法，幸运的是，大多数时候不提供这个报头不会引起任何问题(请阅读浏览器警告)。除非您的网站/web应用程序是使用(i)框架加载到其他网站。这就是IE成为***的巨大痛苦之处。除非设置了P3P报头，否则它将不允许您设置cookie。
了解到这一点，我想找到以下两个问题的答案:
谁在乎呢?换句话说，如果我把“土豆”这个词放在标题中，我会被起诉吗?
其他公司怎么做?
我的发现是:
没人在乎。我找不到任何一份文件表明这项技术有任何法律效力。在我的研究中，我没有发现世界上任何一个国家通过法律禁止在P3P标题中使用“Potato”这个词
谷歌和Facebook都在他们的P3P报头字段中放了一个链接，指向一个页面，描述为什么他们没有P3P报头。
这个概念诞生于2002年，让我困惑的是，这个过时的、法律上未实现的概念仍然被强加在IE的开发人员身上。
如果此报头没有任何法律后果，则应忽略此报头(或者在控制台中生成警告或通知)。不执行!我现在被迫在我的代码中放入一行(并向客户端发送一个报头)，它完全不做任何事情。
简而言之，为了让IE满意，在PHP代码中添加以下代码行(其他语言应该看起来类似)
header('P3P: CP="Potato"');
问题解决了，IE对这个土豆很满意。
这终于为我工作了(经过大量的忙乱和使用ibm策略生成器生成了一些策略)。您可以在这里下载策略生成器:http://www.softpedia.com/get/Security/Security-Related/P3P-Policy-Editor.shtml
我再也不能从IBM官方网站下载生成器了。
我在我的Web-App的根文件夹中创建了这些文件
/index.php
/w3c/policy.html (Human readable format)
/w3c/p3p.xml
/w3c/policy.p3p
Index.php:只发送一个额外的头文件:
header('P3P: policyref="/w3c/p3p.xml", CP="ALL DSP NID CURa ADMa DEVa HISa OTPa OUR NOR NAV DEM"');
p3p.xml的内容
<META>
<POLICY-REFERENCES>
<POLICY-REF about="/w3c/policy.p3p#App">
<INCLUDE>/</INCLUDE>
<COOKIE-INCLUDE/>
</POLICY-REF>
</POLICY-REFERENCES>
</META>
policy.html文件的内容
<html>
<head>
<STYLE type="text/css">
title { color: #3333FF}
</STYLE>
<title>Privacy Statement for YOUR COMPANY NAME</title>
</head>
<body>
<h1 class="title">Privacy Policy</h1>
<!-- "About Us" section of privacy policy -->
<h2>About Us</h2>
<p>This is a privacy policy for YOUR COMPANY NAME.
Our homepage on the Web is located at <a href="YOURWEBSITE">
YOURWEBSITE</a>.
The full text of our privacy policy is available on the Web at
<a href="ABSOLUTE URL OF THIS FILE">
ABSOLUTE URL OF THIS FILE</a>
This policy does not tell users where they can go to exercise their opt-in or opt-out options.
<p>We invite you to contact us if you have questions about this policy.
You may contact us by mail at the following address:
<pre>FIRSTNAME LASTNAME
YOUR ADDRESS HERE
</pre>
<p>You may contact us by e-mail at
<a href="mailto:info@YOURMAIL.de">
info@YOURMAIL.eu</a>.
You may call us at TELEPHONENUMBER.
<!-- "Privacy Seals" section of privacy policy -->
<h2>Dispute Resolution and Privacy Seals</h2>
<p>We have the following privacy seals and/or dispute resolution mechanisms.
If you think we have not followed our privacy policy in some way, they can help you resolve your concern.
<ul>
<li>
<b>Dispute</b>:
Contact us for further information
</ul>
<!-- "Additional information" section of privacy policy -->
<h2>Additional Information</h2>
<p>
This policy is valid for 1 day from the time that it is loaded by a client.
</p>
<!-- "Data Collection" section of privacy policy -->
<h2>Data Collection</h2>
<p>P3P policies declare the data they collect in groups (also referred to as "statements").
This policy contains 1 data group.
<hr width="50%" align="center">
<h3>Group "App control data"</h3>
<p>We collect the following information:
<ul>
<li>HTTP cookies</li>
</ul>
<p>This data will be used for the following purposes:</p>
<ul>
<li>Completion and support of the current activity.</li>
<li>Web site and system administration.</li>
<li>Research and development.</li>
<li>Historical preservation.</li>
<li>Other purposes<p>Control Flow of the application</p></li>
</ul>
<p>This data will be used by ourselves and our agents.
<p>The data in this group has been marked as non-identifiable. This means that there is no
reasonable way for the site to identify the individual person this data was collected from.
<p>The following explanation is provided for why this data is collected:</p>
<blockquote>This cookie data is only used to control the application within an iframe (e.g. a Facebook App)</blockquote>
<!-- "Use of Cookies" section of privacy policy -->
<hr width="50%" align="center">
<h2>Cookies</h2>
<p>Cookies are a technology which can be used to provide you with tailored information from a Web site. A cookie is an element of data that a Web site can send to your browser, which may then store it on your system. You can set your browser to notify you when you receive a cookie, giving you the chance to decide whether to accept it.
<p>Our site makes use of cookies.
Cookies are used for the following purposes:
<ul>
<li>Site administration
<li>Completing the user's current activity
<li>Research and development
<li>Other
(Control Flow of the application)
</ul>
<!-- "Compact Policy Explanation" section of privacy policy -->
<hr width="50%" align="center">
<h2>Compact Policy Summary</h2>
<p>The compact policy which corresponds to this policy is:
<pre>
CP="ALL DSP NID CURa ADMa DEVa HISa OTPa OUR NOR NAV"
</pre>
<p>The following table explains the meaning of each field in the compact policy.
<center><table width="80%" border="1" cols="2">
<tr><td align="center" valign="top" width="20%"><b>Field</b></td><td align="center" valign="top" width="80%"><b>Meaning</b></td></tr>
<tr><td align="left" valign="top" width="20%"><tt>CP=</tt></td>
<td align="left" valign="top" width="80%">This is the compact policy header; it indicates that what follows is a P3P compact policy.</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>ALL</tt></td>
<td align="left" valign="top" width="80%">
Access to all collected information is available.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>DSP</tt></td>
<td align="left" valign="top" width="80%">
The policy contains at least one dispute-resolution mechanism.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>NID</tt></td>
<td align="left" valign="top" width="80%">
The information collected is not personally identifiable.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>CURa</tt></td>
<td align="left" valign="top" width="80%">
The data is used for completion of the current activity.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>ADMa</tt></td>
<td align="left" valign="top" width="80%">
The data is used for site administration.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>DEVa</tt></td>
<td align="left" valign="top" width="80%">
The data is used for research and development.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>HISa</tt></td>
<td align="left" valign="top" width="80%">
The data is used for historical archival purposes.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>OTPa</tt></td>
<td align="left" valign="top" width="80%">
The data is used for other purposes.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>OUR</tt></td>
<td align="left" valign="top" width="80%">
The data is given to ourselves and our agents.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>NOR</tt></td>
<td align="left" valign="top" width="80%">
The data is not kept beyond the current transaction.
</td></tr>
<tr><td align="left" valign="top" width="20%"><tt>NAV</tt></td>
<td align="left" valign="top" width="80%">
Navigation and clickstream data is collected.
</td></tr>
</table></center>
<p>The compact policy is sent by the Web server along with the cookies it describes.
For more information, see the P3P deployment guide at <a href="http://www.w3.org/TR/p3pdeployment">http://www.w3.org/TR/p3pdeployment</a>.
<!-- "Policy Evaluation" section of privacy policy -->
<hr width="50%" align="center">
<h2>Policy Evaluation</h2>
<p>Microsoft Internet Explorer 6 will evaluate this policy's compact policy whenever it is used with a cookie.
The actions IE will take depend on what privacy level the user has selected in their browser (Low, Medium, Medium High, or High; the default is Medium.
In addition, IE will examine whether the cookie's policy is considered satisfactory or unsatisfactory, whether the cookie is a session cookie or a persistent cookie, and whether the cookie is used in a first-party or third-party context.
This section will attempt to evaluate this policy's compact policy against Microsoft's stated behavior for IE6.
<p><b>Note:</b> this evaluation is currently experimental and should not be considered a substitute for testing with a real Web browser.
<p><b>Satisfactory policy</b>: this compact policy is considered <em>satisfactory</em> according to the rules defined by Internet Explorer 6.
IE6 will accept cookies accompanied by this policy under the High, Medium High, Medium, Low, and Accept All Cookies settings.
</body></html>
policy.p3p的内容
<?xml version="1.0"?>
<POLICIES xmlns="http://www.w3.org/2002/01/P3Pv1">
<!-- Generated by IBM P3P Policy Editor version Beta 1.12 built 2/27/04 1:19 PM -->
<!-- Expiry information for this policy -->
<EXPIRY max-age="86400"/>
<POLICY
name="App"
discuri="ABSOLUTE URL TO policy.html"
xml:lang="de">
<!-- Description of the entity making this policy statement. -->
<ENTITY>
<DATA-GROUP>
<DATA ref="#business.name">COMPANY NAME</DATA>
<DATA ref="#business.contact-info.online.email">info@YOURMAIL.eu</DATA>
<DATA ref="#business.contact-info.online.uri">YOURWEBSITE</DATA>
<DATA ref="#business.contact-info.telecom.telephone.number">YOURPHONENUMBER</DATA>
<DATA ref="#business.contact-info.postal.organization">FIRSTNAME LASTNAME</DATA>
<DATA ref="#business.contact-info.postal.street">STREET</DATA>
<DATA ref="#business.contact-info.postal.city">CITY</DATA>
<DATA ref="#business.contact-info.postal.stateprov">STAGE</DATA>
<DATA ref="#business.contact-info.postal.postalcode">POSTALCODE</DATA>
<DATA ref="#business.contact-info.postal.country">Germany</DATA>
</DATA-GROUP>
</ENTITY>
<!-- Disclosure -->
<ACCESS><all/></ACCESS>
<!-- Disputes -->
<DISPUTES-GROUP>
<DISPUTES resolution-type="service" service="YOURWEBSITE CONTACT FORM" short-description="Dispute">
<LONG-DESCRIPTION>Contact us for further information</LONG-DESCRIPTION>
<!-- No remedies specified -->
</DISPUTES>
</DISPUTES-GROUP>
<!-- Statement for group "App control data" -->
<STATEMENT>
<EXTENSION optional="yes">
<GROUP-INFO xmlns="http://www.software.ibm.com/P3P/editor/extension-1.0.html" name="App control data"/>
</EXTENSION>
<!-- Consequence -->
<CONSEQUENCE>
This cookie data is only used to control the application within an iframe (e.g. a Facebook App)</CONSEQUENCE>
<!-- Data in this statement is marked as being non-identifiable -->
<NON-IDENTIFIABLE/>
<!-- Use (purpose) -->
<PURPOSE><admin/><current/><develop/><historical/><other-purpose>Control Flow of the application</other-purpose></PURPOSE>
<!-- Recipients -->
<RECIPIENT><ours/></RECIPIENT>
<!-- Retention -->
<RETENTION><no-retention/></RETENTION>
<!-- Base dataschema elements. -->
<DATA-GROUP>
<DATA ref="#dynamic.cookies"><CATEGORIES><navigation/></CATEGORIES></DATA>
</DATA-GROUP>
</STATEMENT>
<!-- End of policy -->
</POLICY>
</POLICIES>
