#include "nsContentSecurityManager.h" #include "nsIChannel.h" #include "nsIHttpChannelInternal.h" #include "nsIStreamListener.h" #include "nsILoadInfo.h" #include "nsContentUtils.h" #include "nsCORSListenerProxy.h" #include "nsIStreamListener.h" #include "nsIDocument.h" #include "nsMixedContentBlocker.h" #include "mozilla/dom/Element.h" NS_IMPL_ISUPPORTS(nsContentSecurityManager, nsIContentSecurityManager, nsIChannelEventSink) static nsresult ValidateSecurityFlags(nsILoadInfo* aLoadInfo) { nsSecurityFlags securityMode = aLoadInfo->GetSecurityMode(); if (securityMode != nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS && securityMode != nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED && securityMode != nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS && securityMode != nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL && securityMode != nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) { MOZ_ASSERT(false, "need one securityflag from nsILoadInfo to perform security checks"); return NS_ERROR_FAILURE; } // all good, found the right security flags return NS_OK; } static bool SchemeIs(nsIURI* aURI, const char* aScheme) { nsCOMPtr baseURI = NS_GetInnermostURI(aURI); NS_ENSURE_TRUE(baseURI, false); bool isScheme = false; return NS_SUCCEEDED(baseURI->SchemeIs(aScheme, &isScheme)) && isScheme; } static bool IsImageLoadInEditorAppType(nsILoadInfo* aLoadInfo) { // Editor apps get special treatment here, editors can load images // from anywhere. This allows editor to insert images from file:// // into documents that are being edited. nsContentPolicyType type = aLoadInfo->InternalContentPolicyType(); if (type != nsIContentPolicy::TYPE_INTERNAL_IMAGE && type != nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD && type != nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON && type != nsIContentPolicy::TYPE_IMAGESET) { return false; } uint32_t appType = nsIDocShell::APP_TYPE_UNKNOWN; nsINode* node = aLoadInfo->LoadingNode(); if (!node) { return false; } nsIDocument* doc = node->OwnerDoc(); if (!doc) { return false; } nsCOMPtr docShellTreeItem = doc->GetDocShell(); if (!docShellTreeItem) { return false; } nsCOMPtr root; docShellTreeItem->GetRootTreeItem(getter_AddRefs(root)); nsCOMPtr docShell(do_QueryInterface(root)); if (!docShell || NS_FAILED(docShell->GetAppType(&appType))) { appType = nsIDocShell::APP_TYPE_UNKNOWN; } return appType == nsIDocShell::APP_TYPE_EDITOR; } static nsresult DoCheckLoadURIChecks(nsIURI* aURI, nsILoadInfo* aLoadInfo) { // Bug 1228117: determine the correct security policy for DTD loads if (aLoadInfo->GetExternalContentPolicyType() == nsIContentPolicy::TYPE_DTD) { return NS_OK; } if (IsImageLoadInEditorAppType(aLoadInfo)) { return NS_OK; } uint32_t flags = nsIScriptSecurityManager::STANDARD; if (aLoadInfo->GetAllowChrome()) { flags |= nsIScriptSecurityManager::ALLOW_CHROME; } if (aLoadInfo->GetDisallowScript()) { flags |= nsIScriptSecurityManager::DISALLOW_SCRIPT; } // Only call CheckLoadURIWithPrincipal() using the TriggeringPrincipal and not // the LoadingPrincipal when SEC_ALLOW_CROSS_ORIGIN_* security flags are set, // to allow, e.g. user stylesheets to load chrome:// URIs. return nsContentUtils::GetSecurityManager()-> CheckLoadURIWithPrincipal(aLoadInfo->TriggeringPrincipal(), aURI, flags); } static bool URIHasFlags(nsIURI* aURI, uint32_t aURIFlags) { bool hasFlags; nsresult rv = NS_URIChainHasFlags(aURI, aURIFlags, &hasFlags); NS_ENSURE_SUCCESS(rv, false); return hasFlags; } static nsresult DoSOPChecks(nsIURI* aURI, nsILoadInfo* aLoadInfo, nsIChannel* aChannel) { if (aLoadInfo->GetAllowChrome() && (URIHasFlags(aURI, nsIProtocolHandler::URI_IS_UI_RESOURCE) || SchemeIs(aURI, "moz-safe-about"))) { // UI resources are allowed. return DoCheckLoadURIChecks(aURI, aLoadInfo); } NS_ENSURE_FALSE(NS_HasBeenCrossOrigin(aChannel, true), NS_ERROR_DOM_BAD_URI); return NS_OK; } static nsresult DoCORSChecks(nsIChannel* aChannel, nsILoadInfo* aLoadInfo, nsCOMPtr& aInAndOutListener) { MOZ_RELEASE_ASSERT(aInAndOutListener, "can not perform CORS checks without a listener"); // No need to set up CORS if TriggeringPrincipal is the SystemPrincipal. // For example, allow user stylesheets to load XBL from external files // without requiring CORS. if (nsContentUtils::IsSystemPrincipal(aLoadInfo->TriggeringPrincipal())) { return NS_OK; } nsIPrincipal* loadingPrincipal = aLoadInfo->LoadingPrincipal(); RefPtr corsListener = new nsCORSListenerProxy(aInAndOutListener, loadingPrincipal, aLoadInfo->GetCookiePolicy() == nsILoadInfo::SEC_COOKIES_INCLUDE); // XXX: @arg: DataURIHandling::Allow // lets use DataURIHandling::Allow for now and then decide on callsite basis. see also: // http://mxr.mozilla.org/mozilla-central/source/dom/security/nsCORSListenerProxy.h#33 nsresult rv = corsListener->Init(aChannel, DataURIHandling::Allow); NS_ENSURE_SUCCESS(rv, rv); aInAndOutListener = corsListener; return NS_OK; } static nsresult DoContentSecurityChecks(nsIChannel* aChannel, nsILoadInfo* aLoadInfo) { nsCOMPtr uri; nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri)); NS_ENSURE_SUCCESS(rv, rv); nsContentPolicyType contentPolicyType = aLoadInfo->GetExternalContentPolicyType(); nsContentPolicyType internalContentPolicyType = aLoadInfo->InternalContentPolicyType(); nsCString mimeTypeGuess; nsCOMPtr requestingContext = nullptr; #ifdef DEBUG // Don't enforce TYPE_DOCUMENT assertions for loads // initiated by javascript tests. bool skipContentTypeCheck = false; skipContentTypeCheck = Preferences::GetBool("network.loadinfo.skip_type_assertion"); #endif switch(contentPolicyType) { case nsIContentPolicy::TYPE_OTHER: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_SCRIPT: { mimeTypeGuess = NS_LITERAL_CSTRING("application/javascript"); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_IMAGE: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_STYLESHEET: { mimeTypeGuess = NS_LITERAL_CSTRING("text/css"); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_OBJECT: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_DOCUMENT: { MOZ_ASSERT(skipContentTypeCheck || false, "contentPolicyType not supported yet"); break; } case nsIContentPolicy::TYPE_SUBDOCUMENT: { mimeTypeGuess = NS_LITERAL_CSTRING("text/html"); requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE, "type_subdocument requires requestingContext of type Document"); break; } case nsIContentPolicy::TYPE_REFRESH: { MOZ_ASSERT(false, "contentPolicyType not supported yet"); break; } case nsIContentPolicy::TYPE_XBL: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_PING: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_XMLHTTPREQUEST: { // alias nsIContentPolicy::TYPE_DATAREQUEST: requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE, "type_xml requires requestingContext of type Document"); // We're checking for the external TYPE_XMLHTTPREQUEST here in case // an addon creates a request with that type. if (internalContentPolicyType == nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST || internalContentPolicyType == nsIContentPolicy::TYPE_XMLHTTPREQUEST) { mimeTypeGuess = EmptyCString(); } else { MOZ_ASSERT(internalContentPolicyType == nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE, "can not set mime type guess for unexpected internal type"); mimeTypeGuess = NS_LITERAL_CSTRING(TEXT_EVENT_STREAM); } break; } case nsIContentPolicy::TYPE_OBJECT_SUBREQUEST: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::ELEMENT_NODE, "type_subrequest requires requestingContext of type Element"); break; } case nsIContentPolicy::TYPE_DTD: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE, "type_dtd requires requestingContext of type Document"); break; } case nsIContentPolicy::TYPE_FONT: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_MEDIA: { if (internalContentPolicyType == nsIContentPolicy::TYPE_INTERNAL_TRACK) { mimeTypeGuess = NS_LITERAL_CSTRING("text/vtt"); } else { mimeTypeGuess = EmptyCString(); } requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::ELEMENT_NODE, "type_media requires requestingContext of type Element"); break; } case nsIContentPolicy::TYPE_WEBSOCKET: { // Websockets have to use the proxied URI: // ws:// instead of http:// for CSP checks nsCOMPtr httpChannelInternal = do_QueryInterface(aChannel); MOZ_ASSERT(httpChannelInternal); if (httpChannelInternal) { httpChannelInternal->GetProxyURI(getter_AddRefs(uri)); } mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_CSP_REPORT: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_XSLT: { mimeTypeGuess = NS_LITERAL_CSTRING("application/xml"); requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE, "type_xslt requires requestingContext of type Document"); break; } case nsIContentPolicy::TYPE_BEACON: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); MOZ_ASSERT(!requestingContext || requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE, "type_beacon requires requestingContext of type Document"); break; } case nsIContentPolicy::TYPE_FETCH: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_IMAGESET: { mimeTypeGuess = EmptyCString(); requestingContext = aLoadInfo->LoadingNode(); break; } case nsIContentPolicy::TYPE_WEB_MANIFEST: { mimeTypeGuess = NS_LITERAL_CSTRING("application/manifest+json"); requestingContext = aLoadInfo->LoadingNode(); break; } default: // nsIContentPolicy::TYPE_INVALID MOZ_ASSERT(false, "can not perform security check without a valid contentType"); } int16_t shouldLoad = nsIContentPolicy::ACCEPT; rv = NS_CheckContentLoadPolicy(internalContentPolicyType, uri, aLoadInfo->LoadingPrincipal(), requestingContext, mimeTypeGuess, nullptr, //extra, &shouldLoad, nsContentUtils::GetContentPolicy(), nsContentUtils::GetSecurityManager()); NS_ENSURE_SUCCESS(rv, rv); if (NS_CP_REJECTED(shouldLoad)) { return NS_ERROR_CONTENT_BLOCKED; } if (nsMixedContentBlocker::sSendHSTSPriming) { rv = nsMixedContentBlocker::MarkLoadInfoForPriming(uri, requestingContext, aLoadInfo); return rv; } return NS_OK; } /* * Based on the security flags provided in the loadInfo of the channel, * doContentSecurityCheck() performs the following content security checks * before opening the channel: * * (1) Same Origin Policy Check (if applicable) * (2) Allow Cross Origin but perform sanity checks whether a principal * is allowed to access the following URL. * (3) Perform CORS check (if applicable) * (4) ContentPolicy checks (Content-Security-Policy, Mixed Content, ...) * * @param aChannel * The channel to perform the security checks on. * @param aInAndOutListener * The streamListener that is passed to channel->AsyncOpen2() that is now potentially * wrappend within nsCORSListenerProxy() and becomes the corsListener that now needs * to be set as new streamListener on the channel. */ nsresult nsContentSecurityManager::doContentSecurityCheck(nsIChannel* aChannel, nsCOMPtr& aInAndOutListener) { NS_ENSURE_ARG(aChannel); nsCOMPtr loadInfo = aChannel->GetLoadInfo(); if (!loadInfo) { MOZ_ASSERT(false, "channel needs to have loadInfo to perform security checks"); return NS_ERROR_UNEXPECTED; } // if dealing with a redirected channel then we have already installed // streamlistener and redirect proxies and so we are done. if (loadInfo->GetInitialSecurityCheckDone()) { return NS_OK; } // make sure that only one of the five security flags is set in the loadinfo // e.g. do not require same origin and allow cross origin at the same time nsresult rv = ValidateSecurityFlags(loadInfo); NS_ENSURE_SUCCESS(rv, rv); // since aChannel was openend using asyncOpen2() we have to make sure // that redirects of that channel also get openend using asyncOpen2() // please note that some implementations of ::AsyncOpen2 might already // have set that flag to true (e.g. nsViewSourceChannel) in which case // we just set the flag again. loadInfo->SetEnforceSecurity(true); if (loadInfo->GetSecurityMode() == nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) { rv = DoCORSChecks(aChannel, loadInfo, aInAndOutListener); NS_ENSURE_SUCCESS(rv, rv); } rv = CheckChannel(aChannel); NS_ENSURE_SUCCESS(rv, rv); // Perform all ContentPolicy checks (MixedContent, CSP, ...) rv = DoContentSecurityChecks(aChannel, loadInfo); NS_ENSURE_SUCCESS(rv, rv); // now lets set the initalSecurityFlag for subsequent calls loadInfo->SetInitialSecurityCheckDone(true); // all security checks passed - lets allow the load return NS_OK; } NS_IMETHODIMP nsContentSecurityManager::AsyncOnChannelRedirect(nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aRedirFlags, nsIAsyncVerifyRedirectCallback *aCb) { nsCOMPtr loadInfo = aOldChannel->GetLoadInfo(); // Are we enforcing security using LoadInfo? if (loadInfo && loadInfo->GetEnforceSecurity()) { nsresult rv = CheckChannel(aNewChannel); if (NS_FAILED(rv)) { aOldChannel->Cancel(rv); return rv; } } // Also verify that the redirecting server is allowed to redirect to the // given URI nsCOMPtr oldPrincipal; nsContentUtils::GetSecurityManager()-> GetChannelResultPrincipal(aOldChannel, getter_AddRefs(oldPrincipal)); nsCOMPtr newURI; aNewChannel->GetURI(getter_AddRefs(newURI)); nsCOMPtr newOriginalURI; aNewChannel->GetOriginalURI(getter_AddRefs(newOriginalURI)); NS_ENSURE_STATE(oldPrincipal && newURI && newOriginalURI); const uint32_t flags = nsIScriptSecurityManager::LOAD_IS_AUTOMATIC_DOCUMENT_REPLACEMENT | nsIScriptSecurityManager::DISALLOW_SCRIPT; nsresult rv = nsContentUtils::GetSecurityManager()-> CheckLoadURIWithPrincipal(oldPrincipal, newURI, flags); if (NS_SUCCEEDED(rv) && newOriginalURI != newURI) { rv = nsContentUtils::GetSecurityManager()-> CheckLoadURIWithPrincipal(oldPrincipal, newOriginalURI, flags); } NS_ENSURE_SUCCESS(rv, rv); aCb->OnRedirectVerifyCallback(NS_OK); return NS_OK; } static void AddLoadFlags(nsIRequest *aRequest, nsLoadFlags aNewFlags) { nsLoadFlags flags; aRequest->GetLoadFlags(&flags); flags |= aNewFlags; aRequest->SetLoadFlags(flags); } /* * Check that this channel passes all security checks. Returns an error code * if this requesst should not be permitted. */ nsresult nsContentSecurityManager::CheckChannel(nsIChannel* aChannel) { nsCOMPtr loadInfo = aChannel->GetLoadInfo(); MOZ_ASSERT(loadInfo); nsCOMPtr uri; nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri)); NS_ENSURE_SUCCESS(rv, rv); // Handle cookie policies uint32_t cookiePolicy = loadInfo->GetCookiePolicy(); if (cookiePolicy == nsILoadInfo::SEC_COOKIES_SAME_ORIGIN) { // We shouldn't have the SEC_COOKIES_SAME_ORIGIN flag for top level loads MOZ_ASSERT(loadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_DOCUMENT); nsIPrincipal* loadingPrincipal = loadInfo->LoadingPrincipal(); // It doesn't matter what we pass for the third, data-inherits, argument. // Any protocol which inherits won't pay attention to cookies anyway. rv = loadingPrincipal->CheckMayLoad(uri, false, false); if (NS_FAILED(rv)) { AddLoadFlags(aChannel, nsIRequest::LOAD_ANONYMOUS); } } else if (cookiePolicy == nsILoadInfo::SEC_COOKIES_OMIT) { AddLoadFlags(aChannel, nsIRequest::LOAD_ANONYMOUS); } nsSecurityFlags securityMode = loadInfo->GetSecurityMode(); // CORS mode is handled by nsCORSListenerProxy if (securityMode == nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) { if (NS_HasBeenCrossOrigin(aChannel)) { loadInfo->MaybeIncreaseTainting(LoadTainting::CORS); } return NS_OK; } // Allow subresource loads if TriggeringPrincipal is the SystemPrincipal. // For example, allow user stylesheets to load XBL from external files. if (nsContentUtils::IsSystemPrincipal(loadInfo->TriggeringPrincipal()) && loadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_DOCUMENT && loadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_SUBDOCUMENT) { return NS_OK; } // if none of the REQUIRE_SAME_ORIGIN flags are set, then SOP does not apply if ((securityMode == nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS) || (securityMode == nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED)) { rv = DoSOPChecks(uri, loadInfo, aChannel); NS_ENSURE_SUCCESS(rv, rv); } if ((securityMode == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS) || (securityMode == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL)) { if (NS_HasBeenCrossOrigin(aChannel)) { loadInfo->MaybeIncreaseTainting(LoadTainting::Opaque); } // Please note that DoCheckLoadURIChecks should only be enforced for // cross origin requests. If the flag SEC_REQUIRE_CORS_DATA_INHERITS is set // within the loadInfo, then then CheckLoadURIWithPrincipal is performed // within nsCorsListenerProxy rv = DoCheckLoadURIChecks(uri, loadInfo); NS_ENSURE_SUCCESS(rv, rv); } return NS_OK; } // ==== nsIContentSecurityManager implementation ===== NS_IMETHODIMP nsContentSecurityManager::PerformSecurityCheck(nsIChannel* aChannel, nsIStreamListener* aStreamListener, nsIStreamListener** outStreamListener) { nsCOMPtr inAndOutListener = aStreamListener; nsresult rv = doContentSecurityCheck(aChannel, inAndOutListener); NS_ENSURE_SUCCESS(rv, rv); inAndOutListener.forget(outStreamListener); return NS_OK; } NS_IMETHODIMP nsContentSecurityManager::IsOriginPotentiallyTrustworthy(nsIPrincipal* aPrincipal, bool* aIsTrustWorthy) { MOZ_ASSERT(NS_IsMainThread()); NS_ENSURE_ARG_POINTER(aPrincipal); NS_ENSURE_ARG_POINTER(aIsTrustWorthy); if (aPrincipal->GetIsSystemPrincipal()) { *aIsTrustWorthy = true; return NS_OK; } // The following implements: // https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy *aIsTrustWorthy = false; if (aPrincipal->GetIsNullPrincipal()) { return NS_OK; } MOZ_ASSERT(aPrincipal->GetIsCodebasePrincipal(), "Nobody is expected to call us with an nsIExpandedPrincipal"); nsCOMPtr uri; aPrincipal->GetURI(getter_AddRefs(uri)); nsAutoCString scheme; nsresult rv = uri->GetScheme(scheme); if (NS_FAILED(rv)) { return NS_OK; } // Blobs are expected to inherit their principal so we don't expect to have // a codebase principal with scheme 'blob' here. We can't assert that though // since someone could mess with a non-blob URI to give it that scheme. NS_WARNING_ASSERTION(!scheme.EqualsLiteral("blob"), "IsOriginPotentiallyTrustworthy ignoring blob scheme"); // According to the specification, the user agent may choose to extend the // trust to other, vendor-specific URL schemes. We use this for "resource:", // which is technically a substituting protocol handler that is not limited to // local resource mapping, but in practice is never mapped remotely as this // would violate assumptions a lot of code makes. if (scheme.EqualsLiteral("https") || scheme.EqualsLiteral("file") || scheme.EqualsLiteral("resource") || scheme.EqualsLiteral("app") || scheme.EqualsLiteral("moz-extension") || scheme.EqualsLiteral("wss")) { *aIsTrustWorthy = true; return NS_OK; } nsAutoCString host; rv = uri->GetHost(host); if (NS_FAILED(rv)) { return NS_OK; } if (host.Equals("127.0.0.1") || host.Equals("localhost") || host.Equals("::1")) { *aIsTrustWorthy = true; return NS_OK; } // If a host is not considered secure according to the default algorithm, then // check to see if it has been whitelisted by the user. We only apply this // whitelist for network resources, i.e., those with scheme "http" or "ws". // The pref should contain a comma-separated list of hostnames. if (scheme.EqualsLiteral("http") || scheme.EqualsLiteral("ws")) { nsAdoptingCString whitelist = Preferences::GetCString("dom.securecontext.whitelist"); if (whitelist) { nsCCharSeparatedTokenizer tokenizer(whitelist, ','); while (tokenizer.hasMoreTokens()) { const nsCSubstring& allowedHost = tokenizer.nextToken(); if (host.Equals(allowedHost)) { *aIsTrustWorthy = true; return NS_OK; } } } } return NS_OK; }