Content Security Policy. Vlastimil Zíma 24. listopadu 2017

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1 Content Security Policy Vlastimil Zíma 24. listopadu 2017

2 Content Security Policy Obrana před XSS apod. Vázaný na HTML stránku Level 2, ve vývoji Level 3

3 Jak to funguje HTML + CSP Prohlížeč eval() CSP

4 Základní direktivy script-src JS style-src CSS object-src <object> apod. img-src obrázky media-src audio, video apod. child-src frame-src <frame>, <iframe> worker-src Worker apod. font-src fonty connect-src AJAX apod. default-src

5 Hodnoty direktiv Speciální hodnoty 'self' 'none' * 'unsafe-inline' <style>, style=, <script>, on*= apod. 'unsafe-eval' eval, settimeout a setinterval Schémata https: data: Zdroje example.cz *.example.cz example.cz:8000 Výjimky pro inline 'nonce-vybrana-hodnota' 'sha256-base64-hodnota'

6 Hlášení report-uri Závislé na prohlížeči Zobrazují se v konzoli {"csp-report" : { "document-uri" : " "referrer" : "", "blocked-uri" : " "violated-directive" : "default-src 'self'", "original-policy" : "default-src 'self'; report-uri "status-code" : 200, "effective-directive" : "style-src", "source-file" : " "line-number" : 31, "column-number" : 21 }}

7 Kam s ním HTTP hlavička HTML meta Level 2+ Content-Security-Policy Content-Security-Policy-Report-Only X-Content-Security-Policy X-Content-Security-Policy-Report-Only

8 Jak na to 1 default-src 'none' 2 Otestovat 3 Opravit kód / CSP

9 Jak na to 1 default-src 'none' 2 Otestovat 3 Opravit kód / CSP eval, settimeout a setinterval <script>, on*= apod. <style>, style= apod. data: URI

10 Prokletí sociálních sítí Chybí návody Pokus-omyl

11 Prokletí sociálních sítí Chybí návody Pokus-omyl Twitter widget <meta name="twitter:widgets:csp" content="on" /> script-src style-src connect-src

12 Prokletí sociálních sítí Chybí návody Pokus-omyl Facebook +1 script-src

13 Prokletí sociálních sítí Chybí návody Pokus-omyl Google script-src mapy, překlady, CDN script-src Google+, mapy, recaptcha script-src recaptcha style-src fonty v mapách font-src fonty v mapách

14 Naše direktivy default-src 'self'; script-src 'self' 'unsafe-eval' 'unsafe-inline' style-src 'self' 'unsafe-inline' img-src * data:; media-src *; child-src *; frame-src *; worker-src 'none'; font-src 'self' connect-src 'self' report-uri

15 Naše direktivy default-src 'self'; script-src 'self' object-src 'none'; img-src * data:; media-src 'none'; child-src 'none'; frame-src 'none'; connect-src 'self' report-uri

16 Naše CSP HTTP server HTTP hlavičky

17 Statistiky zobrazení/den

18 Statistiky zobrazení/den hlášení/den

19 Statistiky zobrazení/den hlášení/den 70 % script-src se self URI "script-sample":"onfocusin attribute on DIV element"

20 Statistiky zobrazení/den hlášení/den 70 % script-src se self URI "script-sample":"onfocusin attribute on DIV element" 15 % prázdná URI "source-file":" "line-number":19, "column-number":26

21 Statistiky zobrazení/den hlášení/den 70 % script-src se self URI "script-sample":"onfocusin attribute on DIV element" 15 % prázdná URI "source-file":" "line-number":19, "column-number":26 10 % font-src se URI

22 Děkuji za pozornost Vlastimil Zíma

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