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289 lines
11 KiB
C++
289 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Utility routines for checking content load/process policy settings,
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* and routines helpful for content policy implementors.
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*
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* XXXbz it would be nice if some of this stuff could be out-of-lined in
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* nsContentUtils. That would work for almost all the callers...
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*/
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#ifndef __nsContentPolicyUtils_h__
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#define __nsContentPolicyUtils_h__
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#include "nsIContentPolicy.h"
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#include "nsIServiceManager.h"
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#include "nsIContent.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsIPrincipal.h"
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//XXXtw sadly, this makes consumers of nsContentPolicyUtils depend on widget
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#include "nsIDocument.h"
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#include "nsPIDOMWindow.h"
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class nsACString;
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#define NS_CONTENTPOLICY_CONTRACTID "@mozilla.org/layout/content-policy;1"
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#define NS_CONTENTPOLICY_CATEGORY "content-policy"
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#define NS_CONTENTPOLICY_CID \
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{0x0e3afd3d, 0xeb60, 0x4c2b, \
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{ 0x96, 0x3b, 0x56, 0xd7, 0xc4, 0x39, 0xf1, 0x24 }}
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/**
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* Evaluates to true if val is ACCEPT.
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*
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* @param val the status returned from shouldProcess/shouldLoad
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*/
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#define NS_CP_ACCEPTED(val) ((val) == nsIContentPolicy::ACCEPT)
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/**
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* Evaluates to true if val is a REJECT_* status
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*
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* @param val the status returned from shouldProcess/shouldLoad
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*/
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#define NS_CP_REJECTED(val) ((val) != nsIContentPolicy::ACCEPT)
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// Offer convenient translations of constants -> const char*
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// convenience macro to reduce some repetative typing...
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// name is the name of a constant from this interface
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#define CASE_RETURN(name) \
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case nsIContentPolicy:: name : \
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return #name
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#ifdef PR_LOGGING
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/**
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* Returns a string corresponding to the name of the response constant, or
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* "<Unknown Response>" if an unknown response value is given.
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*
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* The return value is static and must not be freed.
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*
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* @param response the response code
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* @return the name of the given response code
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*/
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inline const char *
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NS_CP_ResponseName(int16_t response)
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{
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switch (response) {
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CASE_RETURN( REJECT_REQUEST );
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CASE_RETURN( REJECT_TYPE );
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CASE_RETURN( REJECT_SERVER );
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CASE_RETURN( REJECT_OTHER );
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CASE_RETURN( ACCEPT );
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default:
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return "<Unknown Response>";
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}
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}
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/**
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* Returns a string corresponding to the name of the content type constant, or
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* "<Unknown Type>" if an unknown content type value is given.
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*
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* The return value is static and must not be freed.
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*
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* @param contentType the content type code
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* @return the name of the given content type code
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*/
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inline const char *
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NS_CP_ContentTypeName(uint32_t contentType)
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{
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switch (contentType) {
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CASE_RETURN( TYPE_OTHER );
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CASE_RETURN( TYPE_SCRIPT );
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CASE_RETURN( TYPE_IMAGE );
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CASE_RETURN( TYPE_STYLESHEET );
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CASE_RETURN( TYPE_OBJECT );
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CASE_RETURN( TYPE_DOCUMENT );
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CASE_RETURN( TYPE_SUBDOCUMENT );
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CASE_RETURN( TYPE_REFRESH );
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CASE_RETURN( TYPE_XBL );
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CASE_RETURN( TYPE_PING );
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CASE_RETURN( TYPE_XMLHTTPREQUEST );
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CASE_RETURN( TYPE_OBJECT_SUBREQUEST );
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CASE_RETURN( TYPE_DTD );
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CASE_RETURN( TYPE_FONT );
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CASE_RETURN( TYPE_MEDIA );
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CASE_RETURN( TYPE_WEBSOCKET );
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CASE_RETURN( TYPE_CSP_REPORT );
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default:
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return "<Unknown Type>";
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}
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}
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#endif // defined(PR_LOGGING)
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#undef CASE_RETURN
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/* Passes on parameters from its "caller"'s context. */
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#define CHECK_CONTENT_POLICY(action) \
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PR_BEGIN_MACRO \
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nsCOMPtr<nsIContentPolicy> policy = \
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do_GetService(NS_CONTENTPOLICY_CONTRACTID); \
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if (!policy) \
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return NS_ERROR_FAILURE; \
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\
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return policy-> action (contentType, contentLocation, requestOrigin, \
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context, mimeType, extra, originPrincipal, \
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decision); \
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PR_END_MACRO
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/* Passes on parameters from its "caller"'s context. */
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#define CHECK_CONTENT_POLICY_WITH_SERVICE(action, _policy) \
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PR_BEGIN_MACRO \
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return _policy-> action (contentType, contentLocation, requestOrigin, \
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context, mimeType, extra, originPrincipal, \
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decision); \
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PR_END_MACRO
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/**
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* Check whether we can short-circuit this check and bail out. If not, get the
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* origin URI to use.
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*
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* Note: requestOrigin is scoped outside the PR_BEGIN_MACRO/PR_END_MACRO on
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* purpose */
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#define CHECK_PRINCIPAL \
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nsCOMPtr<nsIURI> requestOrigin; \
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PR_BEGIN_MACRO \
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if (originPrincipal) { \
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nsCOMPtr<nsIScriptSecurityManager> secMan = aSecMan; \
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if (!secMan) { \
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secMan = do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID); \
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} \
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if (secMan) { \
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bool isSystem; \
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nsresult rv = secMan->IsSystemPrincipal(originPrincipal, \
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&isSystem); \
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NS_ENSURE_SUCCESS(rv, rv); \
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if (isSystem) { \
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*decision = nsIContentPolicy::ACCEPT; \
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return NS_OK; \
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} \
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} \
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nsresult rv = originPrincipal->GetURI(getter_AddRefs(requestOrigin)); \
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NS_ENSURE_SUCCESS(rv, rv); \
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} \
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PR_END_MACRO
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/**
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* Alias for calling ShouldLoad on the content policy service. Parameters are
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* the same as nsIContentPolicy::shouldLoad, except for the originPrincipal
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* parameter, which should be non-null if possible, and the last two
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* parameters, which can be used to pass in pointer to some useful services if
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* the caller already has them. The origin URI to pass to shouldLoad will be
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* the URI of originPrincipal, unless originPrincipal is null (in which case a
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* null origin URI will be passed).
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*/
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inline nsresult
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NS_CheckContentLoadPolicy(uint32_t contentType,
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nsIURI *contentLocation,
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nsIPrincipal *originPrincipal,
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nsISupports *context,
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const nsACString &mimeType,
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nsISupports *extra,
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int16_t *decision,
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nsIContentPolicy *policyService = nullptr,
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nsIScriptSecurityManager* aSecMan = nullptr)
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{
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CHECK_PRINCIPAL;
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if (policyService) {
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CHECK_CONTENT_POLICY_WITH_SERVICE(ShouldLoad, policyService);
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}
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CHECK_CONTENT_POLICY(ShouldLoad);
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}
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/**
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* Alias for calling ShouldProcess on the content policy service. Parameters
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* are the same as nsIContentPolicy::shouldLoad, except for the originPrincipal
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* parameter, which should be non-null if possible, and the last two
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* parameters, which can be used to pass in pointer to some useful services if
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* the caller already has them. The origin URI to pass to shouldLoad will be
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* the URI of originPrincipal, unless originPrincipal is null (in which case a
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* null origin URI will be passed).
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*/
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inline nsresult
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NS_CheckContentProcessPolicy(uint32_t contentType,
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nsIURI *contentLocation,
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nsIPrincipal *originPrincipal,
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nsISupports *context,
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const nsACString &mimeType,
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nsISupports *extra,
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int16_t *decision,
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nsIContentPolicy *policyService = nullptr,
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nsIScriptSecurityManager* aSecMan = nullptr)
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{
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CHECK_PRINCIPAL;
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if (policyService) {
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CHECK_CONTENT_POLICY_WITH_SERVICE(ShouldProcess, policyService);
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}
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CHECK_CONTENT_POLICY(ShouldProcess);
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}
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#undef CHECK_CONTENT_POLICY
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#undef CHECK_CONTENT_POLICY_WITH_SERVICE
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/**
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* Helper function to get an nsIDocShell given a context.
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* If the context is a document or window, the corresponding docshell will be
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* returned.
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* If the context is a non-document DOM node, the docshell of its ownerDocument
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* will be returned.
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*
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* @param aContext the context to find a docshell for (can be null)
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*
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* @return a WEAK pointer to the docshell, or nullptr if it could
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* not be obtained
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*
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* @note As of this writing, calls to nsIContentPolicy::Should{Load,Process}
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* for TYPE_DOCUMENT and TYPE_SUBDOCUMENT pass in an aContext that either
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* points to the frameElement of the window the load is happening in
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* (in which case NS_CP_GetDocShellFromContext will return the parent of the
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* docshell the load is happening in), or points to the window the load is
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* happening in (in which case NS_CP_GetDocShellFromContext will return
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* the docshell the load is happening in). It's up to callers to QI aContext
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* and handle things accordingly if they want the docshell the load is
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* happening in. These are somewhat odd semantics, and bug 466687 has been
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* filed to consider improving them.
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*/
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inline nsIDocShell*
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NS_CP_GetDocShellFromContext(nsISupports *aContext)
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{
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if (!aContext) {
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return nullptr;
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}
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nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aContext);
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if (!window) {
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// our context might be a document (which also QIs to nsIDOMNode), so
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// try that first
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nsCOMPtr<nsIDocument> doc = do_QueryInterface(aContext);
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if (!doc) {
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// we were not a document after all, get our ownerDocument,
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// hopefully
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nsCOMPtr<nsIContent> content = do_QueryInterface(aContext);
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if (content) {
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doc = content->OwnerDoc();
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}
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}
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if (doc) {
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if (doc->GetDisplayDocument()) {
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doc = doc->GetDisplayDocument();
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}
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window = doc->GetWindow();
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}
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}
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if (!window) {
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return nullptr;
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}
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return window->GetDocShell();
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}
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#endif /* __nsContentPolicyUtils_h__ */
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