Jan*_*sky 10 google-chrome content-security-policy
我不得不将CSP添加到具有内联样式的页面,并避免使用unsafe-inline我正在使用哈希.我添加哈希的技巧只是在Chrome中加载页面,查看错误消息并复制所有建议的哈希值(例如从中<suggested hash>获取Refused to apply inline style because it violates the following Content Security Policy directive: "style-src ...". Either the 'unsafe-inline' keyword, a hash ('<suggested hash>'), or... is required to enable inline execution.).
这解决了Firefox中的问题,但在Chrome中没有.奇怪的是,Chrome似乎并不尊重它本身产生的哈希值.这导致了一个有趣的情况,即Chrome列出包含哈希的策略,表示它不符合,然后建议我添加一个哈希,它在之前打印的策略中.
我的政策:
default-src 'none'; font-src 'self' data:; img-src 'self'; script-src 'self' 'report-sample'; style-src 'self' 'sha256-/3kWSXHts8LrwfemLzY9W0tOv5I4eLIhrf0pT8cU0WI=' 'sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=' 'sha256-OTeu7NEHDo6qutIWo0F2TmYrDhsKWCzrUgGoxxHGJ8o=' 'sha256-fviu5RwuBYFcCd5CDanhy6NCLufcwvCAbm061aSqhoQ=' 'sha256-wS7xf+bhXBr5EM064hQkAW0vX3ks5VoxbGn+KQC/Vhk=' 'sha256-cxL35Ug49Sl1zHMOdz/r0xinQ6BYGgClHdDCk2XPTzE='; object-src 'self'; connect-src 'self'
这会导致许多错误,例如:
Refused to apply inline style because it violates the following Content Security Policy directive: "style-src 'self' 'sha256-/3kWSXHts8LrwfemLzY9W0tOv5I4eLIhrf0pT8cU0WI=' 'sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=' 'sha256-OTeu7NEHDo6qutIWo0F2TmYrDhsKWCzrUgGoxxHGJ8o=' 'sha256-fviu5RwuBYFcCd5CDanhy6NCLufcwvCAbm061aSqhoQ=' 'sha256-wS7xf+bhXBr5EM064hQkAW0vX3ks5VoxbGn+KQC/Vhk=' 'sha256-cxL35Ug49Sl1zHMOdz/r0xinQ6BYGgClHdDCk2XPTzE='". Either the 'unsafe-inline' keyword, a hash ('sha256-/3kWSXHts8LrwfemLzY9W0tOv5I4eLIhrf0pT8cU0WI='), or a nonce ('nonce-...') is required to enable inline execution. 其中Chrome建议我添加一个已存在于策略中的哈希.
可能有一些特定于Chrome的问题,我很遗憾.任何想法可能是什么?
我假设您在样式属性中拥有内联样式(与内联<style>元素相对)。根据CSP规范,哈希应仅应用于内联<style>元素,而不应用于样式属性。
Chrome显示样式属性的错误消息非常混乱,但实际上符合规范(某些其他浏览器,例如Firefox和IE则不然)。您不能在Chrome的CSP中使用哈希码来允许内联样式属性。如果您绝对需要允许它们,则必须使用'unsafe-inline'。
CSP 3.0规范将可能包括使用扩展哈希码到样式属性的可能性['unsafe-hashed-attributes'][2]。不过,此功能目前仍处于“进行中”状态,并且似乎尚未在Chrome中实现。
例:
<?php
header("Content-Security-Policy: style-src 'self' 'sha256-U/AHSCAVB2ZhU2+kPeMhPfZyIE2wH4fhQ0ZtYjq9/JA=' 'sha256-l8V8xXSfpuv7xbN4e0tIS0v77DG2xfSC1rSpNZak/K8='");
header("Content-Type: text/html");
?>
<!DOCTYPE html>
<html>
<head>
<!-- Inline style - 'sha256-U/AHSCAVB2ZhU2+kPeMhPfZyIE2wH4fhQ0ZtYjq9/JA=' -->
<style>.redtext {color: red;}</style>
</head>
<body>
<div class="redtext">This should be red - style from <style> element.</div>
<!-- Inline style in attribute - 'sha256-l8V8xXSfpuv7xbN4e0tIS0v77DG2xfSC1rSpNZak/K8=' -->
<div style = "color: green;">This should not be green - style from attribute should be disallowed even though its hash is included in style-src in CSP.</div>
</body>
</html>
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