/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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/. */ /* * Utility routines for checking content load/process policy settings, * and routines helpful for content policy implementors. * * XXXbz it would be nice if some of this stuff could be out-of-lined in * nsContentUtils. That would work for almost all the callers... */ #ifndef __nsContentPolicyUtils_h__ #define __nsContentPolicyUtils_h__ #include "mozilla/BasePrincipal.h" #include "nsContentUtils.h" #include "nsIContentPolicy.h" #include "nsIContent.h" #include "nsIURI.h" #include "nsServiceManagerUtils.h" #include "nsStringFwd.h" #include "mozilla/dom/nsCSPService.h" // XXXtw sadly, this makes consumers of nsContentPolicyUtils depend on widget #include "mozilla/dom/Document.h" #include "nsPIDOMWindow.h" #define NS_CONTENTPOLICY_CONTRACTID "@mozilla.org/layout/content-policy;1" #define NS_CONTENTPOLICY_CATEGORY "content-policy" #define NS_CONTENTPOLICY_CID \ { \ 0x0e3afd3d, 0xeb60, 0x4c2b, { \ 0x96, 0x3b, 0x56, 0xd7, 0xc4, 0x39, 0xf1, 0x24 \ } \ } /** * Evaluates to true if val is ACCEPT. * * @param val the status returned from shouldProcess/shouldLoad */ #define NS_CP_ACCEPTED(val) ((val) == nsIContentPolicy::ACCEPT) /** * Evaluates to true if val is a REJECT_* status * * @param val the status returned from shouldProcess/shouldLoad */ #define NS_CP_REJECTED(val) ((val) != nsIContentPolicy::ACCEPT) // Offer convenient translations of constants -> const char* // convenience macro to reduce some repetative typing... // name is the name of a constant from this interface #define CASE_RETURN(name) \ case nsIContentPolicy::name: \ return #name /** * Returns a string corresponding to the name of the response constant, or * "" if an unknown response value is given. * * The return value is static and must not be freed. * * @param response the response code * @return the name of the given response code */ inline const char* NS_CP_ResponseName(int16_t response) { switch (response) { CASE_RETURN(REJECT_REQUEST); CASE_RETURN(REJECT_TYPE); CASE_RETURN(REJECT_SERVER); CASE_RETURN(REJECT_OTHER); CASE_RETURN(ACCEPT); default: return ""; } } /** * Returns a string corresponding to the name of the content type constant, or * "" if an unknown content type value is given. * * The return value is static and must not be freed. * * @param contentType the content type code * @return the name of the given content type code */ inline const char* NS_CP_ContentTypeName(nsContentPolicyType contentType) { switch (contentType) { CASE_RETURN(TYPE_OTHER); CASE_RETURN(TYPE_SCRIPT); CASE_RETURN(TYPE_IMAGE); CASE_RETURN(TYPE_STYLESHEET); CASE_RETURN(TYPE_OBJECT); CASE_RETURN(TYPE_DOCUMENT); CASE_RETURN(TYPE_SUBDOCUMENT); CASE_RETURN(TYPE_PING); CASE_RETURN(TYPE_XMLHTTPREQUEST); CASE_RETURN(TYPE_OBJECT_SUBREQUEST); CASE_RETURN(TYPE_DTD); CASE_RETURN(TYPE_FONT); CASE_RETURN(TYPE_MEDIA); CASE_RETURN(TYPE_WEBSOCKET); CASE_RETURN(TYPE_CSP_REPORT); CASE_RETURN(TYPE_XSLT); CASE_RETURN(TYPE_BEACON); CASE_RETURN(TYPE_FETCH); CASE_RETURN(TYPE_IMAGESET); CASE_RETURN(TYPE_WEB_MANIFEST); CASE_RETURN(TYPE_INTERNAL_SCRIPT); CASE_RETURN(TYPE_INTERNAL_WORKER); CASE_RETURN(TYPE_INTERNAL_SHARED_WORKER); CASE_RETURN(TYPE_INTERNAL_EMBED); CASE_RETURN(TYPE_INTERNAL_OBJECT); CASE_RETURN(TYPE_INTERNAL_FRAME); CASE_RETURN(TYPE_INTERNAL_IFRAME); CASE_RETURN(TYPE_INTERNAL_AUDIO); CASE_RETURN(TYPE_INTERNAL_VIDEO); CASE_RETURN(TYPE_INTERNAL_TRACK); CASE_RETURN(TYPE_INTERNAL_XMLHTTPREQUEST); CASE_RETURN(TYPE_INTERNAL_EVENTSOURCE); CASE_RETURN(TYPE_INTERNAL_SERVICE_WORKER); CASE_RETURN(TYPE_INTERNAL_SCRIPT_PRELOAD); CASE_RETURN(TYPE_INTERNAL_IMAGE); CASE_RETURN(TYPE_INTERNAL_IMAGE_PRELOAD); CASE_RETURN(TYPE_INTERNAL_IMAGE_FAVICON); CASE_RETURN(TYPE_INTERNAL_STYLESHEET); CASE_RETURN(TYPE_INTERNAL_STYLESHEET_PRELOAD); CASE_RETURN(TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS); CASE_RETURN(TYPE_SAVEAS_DOWNLOAD); CASE_RETURN(TYPE_SPECULATIVE); CASE_RETURN(TYPE_INTERNAL_MODULE); CASE_RETURN(TYPE_INTERNAL_MODULE_PRELOAD); CASE_RETURN(TYPE_INTERNAL_DTD); CASE_RETURN(TYPE_INTERNAL_FORCE_ALLOWED_DTD); CASE_RETURN(TYPE_INTERNAL_AUDIOWORKLET); CASE_RETURN(TYPE_INTERNAL_PAINTWORKLET); CASE_RETURN(TYPE_INTERNAL_FONT_PRELOAD); CASE_RETURN(TYPE_INTERNAL_CHROMEUTILS_COMPILED_SCRIPT); CASE_RETURN(TYPE_INTERNAL_FRAME_MESSAGEMANAGER_SCRIPT); CASE_RETURN(TYPE_INTERNAL_FETCH_PRELOAD); CASE_RETURN(TYPE_UA_FONT); CASE_RETURN(TYPE_PROXIED_WEBRTC_MEDIA); CASE_RETURN(TYPE_WEB_IDENTITY); case nsIContentPolicy::TYPE_INVALID: break; // Do not add default: so that compilers can catch the missing case. } return ""; } #undef CASE_RETURN inline const char* NS_CP_ContentTypeName(ExtContentPolicyType contentType) { return NS_CP_ContentTypeName(static_cast(contentType)); } /* Passes on parameters from its "caller"'s context. */ #define CHECK_CONTENT_POLICY(action) \ PR_BEGIN_MACRO \ nsCOMPtr policy = \ do_GetService(NS_CONTENTPOLICY_CONTRACTID); \ if (!policy) return NS_ERROR_FAILURE; \ \ return policy->action(contentLocation, loadInfo, mimeType, decision); \ PR_END_MACRO /* Passes on parameters from its "caller"'s context. */ #define CHECK_CONTENT_POLICY_WITH_SERVICE(action, _policy) \ PR_BEGIN_MACRO \ return _policy->action(contentLocation, loadInfo, mimeType, decision); \ PR_END_MACRO /** * Check whether we can short-circuit this check and bail out. If not, get the * origin URI to use. * * Note: requestOrigin is scoped outside the PR_BEGIN_MACRO/PR_END_MACRO on * purpose */ #define CHECK_PRINCIPAL_CSP_AND_DATA(action) \ PR_BEGIN_MACRO \ if (loadingPrincipal && loadingPrincipal->IsSystemPrincipal()) { \ /* We exempt most loads into any document with the system principal \ * from content policy (except CSP) checks, mostly as an optimization. \ * Which means that we need to apply this check to the loading principal, \ * not the principal that triggered the load. */ \ /* Check CSP for System Privileged pages */ \ CSPService::ConsultCSP(contentLocation, loadInfo, mimeType, decision); \ if (NS_CP_REJECTED(*decision)) { \ return NS_OK; \ } \ if (contentType != nsIContentPolicy::TYPE_DOCUMENT && \ contentType != nsIContentPolicy::TYPE_UA_FONT) { \ *decision = nsIContentPolicy::ACCEPT; \ nsCOMPtr n = do_QueryInterface(context); \ if (!n) { \ nsCOMPtr win = do_QueryInterface(context); \ n = win ? win->GetExtantDoc() : nullptr; \ } \ if (n) { \ mozilla::dom::Document* d = n->OwnerDoc(); \ if (d->IsLoadedAsData() || d->IsBeingUsedAsImage() || \ d->IsResourceDoc()) { \ nsCOMPtr dataPolicy = \ do_GetService("@mozilla.org/data-document-content-policy;1"); \ if (dataPolicy) { \ dataPolicy->action(contentLocation, loadInfo, mimeType, decision); \ } \ } \ } \ } \ return NS_OK; \ } \ PR_END_MACRO /** * Alias for calling ShouldLoad on the content policy service. Parameters are * the same as nsIContentPolicy::shouldLoad, except for the loadingPrincipal * and triggeringPrincipal parameters (which should be non-null if possible, * and have the same semantics as in nsLoadInfo), and the last parameter, * which can be used to pass in a pointer to a useful service if the caller * already has it. The origin URI to pass to shouldLoad will be the URI of * loadingPrincipal, unless loadingPrincipal is null (in which case a null * origin URI will be passed). */ inline nsresult NS_CheckContentLoadPolicy( nsIURI* contentLocation, nsILoadInfo* loadInfo, const nsACString& mimeType, int16_t* decision, nsIContentPolicy* policyService = nullptr) { nsIPrincipal* loadingPrincipal = loadInfo->GetLoadingPrincipal(); nsCOMPtr context = loadInfo->GetLoadingContext(); nsContentPolicyType contentType = loadInfo->InternalContentPolicyType(); CHECK_PRINCIPAL_CSP_AND_DATA(ShouldLoad); if (policyService) { CHECK_CONTENT_POLICY_WITH_SERVICE(ShouldLoad, policyService); } CHECK_CONTENT_POLICY(ShouldLoad); } /** * Alias for calling ShouldProcess on the content policy service. */ inline nsresult NS_CheckContentProcessPolicy( nsIURI* contentLocation, nsILoadInfo* loadInfo, const nsACString& mimeType, int16_t* decision, nsIContentPolicy* policyService = nullptr) { nsIPrincipal* loadingPrincipal = loadInfo->GetLoadingPrincipal(); nsCOMPtr context = loadInfo->GetLoadingContext(); nsContentPolicyType contentType = loadInfo->InternalContentPolicyType(); CHECK_PRINCIPAL_CSP_AND_DATA(ShouldProcess); if (policyService) { CHECK_CONTENT_POLICY_WITH_SERVICE(ShouldProcess, policyService); } CHECK_CONTENT_POLICY(ShouldProcess); } #undef CHECK_CONTENT_POLICY #undef CHECK_CONTENT_POLICY_WITH_SERVICE /** * Helper function to get an nsIDocShell given a context. * If the context is a document or window, the corresponding docshell will be * returned. * If the context is a non-document DOM node, the docshell of its ownerDocument * will be returned. * * @param aContext the context to find a docshell for (can be null) * * @return a WEAK pointer to the docshell, or nullptr if it could * not be obtained * * @note As of this writing, calls to nsIContentPolicy::Should{Load,Process} * for TYPE_DOCUMENT and TYPE_SUBDOCUMENT pass in an aContext that either * points to the frameElement of the window the load is happening in * (in which case NS_CP_GetDocShellFromContext will return the parent of the * docshell the load is happening in), or points to the window the load is * happening in (in which case NS_CP_GetDocShellFromContext will return * the docshell the load is happening in). It's up to callers to QI aContext * and handle things accordingly if they want the docshell the load is * happening in. These are somewhat odd semantics, and bug 466687 has been * filed to consider improving them. */ inline nsIDocShell* NS_CP_GetDocShellFromContext(nsISupports* aContext) { if (!aContext) { return nullptr; } nsCOMPtr window = do_QueryInterface(aContext); if (!window) { // Our context might be a document. nsCOMPtr doc = do_QueryInterface(aContext); if (!doc) { // we were not a document after all, get our ownerDocument, // hopefully nsCOMPtr content = do_QueryInterface(aContext); if (content) { doc = content->OwnerDoc(); } } if (doc) { if (doc->GetDisplayDocument()) { doc = doc->GetDisplayDocument(); } window = doc->GetWindow(); } } if (!window) { return nullptr; } return window->GetDocShell(); } #endif /* __nsContentPolicyUtils_h__ */