nsContentSecurityUtils.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* A namespace class for static content security utilities. */

#ifndef nsContentSecurityUtils_h___

#define nsContentSecurityUtils_h___

#include <utility>

#include "mozilla/Maybe.h"

#include "nsStringFwd.h"

struct JSContext;

class nsIChannel;

class nsIHttpChannel;

class nsIPrincipal;

class NS_ConvertUTF8toUTF16;

namespace mozilla::dom {

class Document;

class Element;

}  // namespace mozilla::dom

using FilenameTypeAndDetails = std::pair<nsCString, mozilla::Maybe<nsCString>>;

class nsContentSecurityUtils {

 public:

  // CSPs upgrade-insecure-requests directive applies to same origin top level

  // navigations. Using the SOP would return false for the case when an https

  // page triggers and http page to load, even though that http page would be

  // upgraded to https later. Hence we have to use that custom function instead

  // of simply calling aTriggeringPrincipal->Equals(aResultPrincipal).

  static bool IsConsideredSameOriginForUIR(nsIPrincipal* aTriggeringPrincipal,

                                           nsIPrincipal* aResultPrincipal);

  static bool IsEvalAllowed(JSContext* cx, bool aIsSystemPrincipal,

                            const nsAString& aScript);

  static void NotifyEvalUsage(bool aIsSystemPrincipal,

                              const nsACString& aFileName, uint64_t aWindowID,

                              uint32_t aLineNumber, uint32_t aColumnNumber);

  // Helper function for various checks:

  // This function detects profiles with userChrome.js or extension signatures

  // disabled. We can't/won't enforce strong security for people with those

  // hacks. The function will cache its result.

  static void DetectJsHacks();

  // Helper function for detecting custom agent styles

  static void DetectCssHacks();

  // Helper function to query the HTTP Channel of a potential

  // multi-part channel. Mostly used for querying response headers

  static nsresult GetHttpChannelFromPotentialMultiPart(

      nsIChannel* aChannel, nsIHttpChannel** aHttpChannel);

  // Helper function which performs the following framing checks

  // * CSP frame-ancestors

  // * x-frame-options

  // If any of the two disallows framing, the channel will be cancelled.

  static void PerformCSPFrameAncestorAndXFOCheck(nsIChannel* aChannel);

  // Helper function which just checks if the channel violates any:

  // 1. CSP frame-ancestors properties

  // 2. x-frame-options

  static bool CheckCSPFrameAncestorAndXFO(nsIChannel* aChannel);

  // Implements https://w3c.github.io/webappsec-csp/#is-element-nonceable.

//

  // Returns an empty nonce for elements without a nonce OR when a potential

  // dangling markup attack was detected.

  static nsString GetIsElementNonceableNonce(

      const mozilla::dom::Element& aElement);

  // Helper function to Check if a Download is allowed;

  static long ClassifyDownload(nsIChannel* aChannel,

                               const nsAutoCString& aMimeTypeGuess);

  // Public only for testing

  static FilenameTypeAndDetails FilenameToFilenameType(

      const nsACString& fileName, bool collectAdditionalExtensionData);

  static char* SmartFormatCrashString(const char* str);

  static char* SmartFormatCrashString(char* str);

  static nsCString SmartFormatCrashString(const char* part1, const char* part2,

                                          const char* format_string);

  static nsCString SmartFormatCrashString(char* part1, char* part2,

                                          const char* format_string);

#if defined(DEBUG)

  static void AssertAboutPageHasCSP(mozilla::dom::Document* aDocument);

#endif

  static bool ValidateScriptFilename(JSContext* cx, const char* aFilename);

  // Helper Function to Post a message to the corresponding JS-Console

  static void LogMessageToConsole(nsIHttpChannel* aChannel, const char* aMsg);

};

#endif /* nsContentSecurityUtils_h___ */