W3C home > Mailing lists > Public > public-webappsec@w3.org > September 2014

Re: CSP reports on eval() and inline

From: Mike West <mkwst@google.com>
Date: Thu, 4 Sep 2014 17:24:34 +0200
Message-ID: <CAKXHy=f7dfvriL8Q92GuKfUaH9x8g0V7PH261PZ-=q=QKw4Djw@mail.gmail.com>
To: Pawel Krawczyk <pawel.krawczyk@hush.com>, Dan Veditz <dveditz@mozilla.com>, Brad Hill <bhill@paypal.com>
Cc: public-webappsec@w3.org
This seems pretty reasonable. My only concern is that existing parsers
wouldn't appreciate invalid URLs in the 'blocked-uri' field.

This might be small enough to sneak into CSP2 at the last minute. WDYT Dan,
Brad?

-mike
On Sep 4, 2014 2:12 PM, "Pawel Krawczyk" <pawel.krawczyk@hush.com> wrote:

> A small issue we have just discussed at GitHub
> https://github.com/w3c/webappsec/issues/52:
>
> CSP violation reports sent when browser blocks eval() and inline script
> are identical in their contents, which makes it difficult to determine what
> really caused them.
>
> In both cases the fields violated-directive will be set to script-scr and
> blocked-uri will be empty. So when I'm trying to analyse received reports
> I can't really say what I should allow - unsafe-eval or unsafe-inline.
> Sample fields extracted from such reports:
>
> "blocked-uri":""
>
> "violated-directive":"script-src 'none’"
> The solution might be either sending some kind of meaningful blocked-url value
> - such as self-eval or self-inline, or adding an additional field to the
> report, such as blocked-feature set to eval or inline respectively.
> Sample full report:
>
>
>    1. {"csp-report":{"document-uri":"http://webcookies.info/","referrer":"
>    ","violated-directive":"script-src 'none'","original-policy":"base-uri
>    http://webcookies.info; connect-src 'none'; font-src 'none';
>    form-action 'none'; frame-ancestors 'none'; child-src 'none'; default-src
>    'none'; frame-src 'none'; img-src 'none'; media-src 'none'; object-src
>    'none'; script-src 'none'; style-src 'none'; report-uri
>    http://new.cspbuilder.info:8080/report/9018643792216450862",
>    "blocked-uri":"","source-file":"
>    http://pagead2.googlesyndication.com","line-number":101,"column-number":236,"status-code":200}
>    }
>
>
>
> --
> Pawel Krawczyk
> pawel.krawczyk@hush.com +44 7879 180015
> CISSP, OWASP
>
>
>
>
Received on Thursday, 4 September 2014 15:25:03 UTC

This archive was generated by hypermail 2.3.1 : Monday, 23 October 2017 14:54:06 UTC