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diff --git a/dom/security/nsMixedContentBlocker.cpp b/dom/security/nsMixedContentBlocker.cpp
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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/. */
+
+#include "nsMixedContentBlocker.h"
+
+#include "nsContentPolicyUtils.h"
+#include "nsCSPContext.h"
+#include "nsThreadUtils.h"
+#include "nsINode.h"
+#include "nsCOMPtr.h"
+#include "nsDocShell.h"
+#include "nsIWebProgressListener.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/WindowContext.h"
+#include "mozilla/dom/Document.h"
+#include "nsIChannel.h"
+#include "nsIParentChannel.h"
+#include "mozilla/Preferences.h"
+#include "nsIScriptObjectPrincipal.h"
+#include "nsIProtocolHandler.h"
+#include "nsCharSeparatedTokenizer.h"
+#include "nsISecureBrowserUI.h"
+#include "nsIWebNavigation.h"
+#include "nsLoadGroup.h"
+#include "nsIScriptError.h"
+#include "nsIURI.h"
+#include "nsIChannelEventSink.h"
+#include "nsNetUtil.h"
+#include "nsAsyncRedirectVerifyHelper.h"
+#include "mozilla/LoadInfo.h"
+#include "nsISiteSecurityService.h"
+#include "prnetdb.h"
+#include "nsQueryObject.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/Logging.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/StaticPrefs_fission.h"
+#include "mozilla/StaticPrefs_security.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "mozilla/net/DNS.h"
+#include "mozilla/net/DocumentLoadListener.h"
+#include "mozilla/net/DocumentChannel.h"
+
+#include "mozilla/dom/nsHTTPSOnlyUtils.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+static mozilla::LazyLogModule sMCBLog("MCBLog");
+
+enum nsMixedContentBlockerMessageType { eBlocked = 0x00, eUserOverride = 0x01 };
+
+// Allowlist of hostnames that should be considered secure contexts even when
+// served over http:// or ws://
+nsCString* nsMixedContentBlocker::sSecurecontextAllowlist = nullptr;
+bool nsMixedContentBlocker::sSecurecontextAllowlistCached = false;
+
+enum MixedContentHSTSState {
+ MCB_HSTS_PASSIVE_NO_HSTS = 0,
+ MCB_HSTS_PASSIVE_WITH_HSTS = 1,
+ MCB_HSTS_ACTIVE_NO_HSTS = 2,
+ MCB_HSTS_ACTIVE_WITH_HSTS = 3
+};
+
+nsMixedContentBlocker::~nsMixedContentBlocker() = default;
+
+NS_IMPL_ISUPPORTS(nsMixedContentBlocker, nsIContentPolicy, nsIChannelEventSink)
+
+static void LogMixedContentMessage(
+ MixedContentTypes aClassification, nsIURI* aContentLocation,
+ uint64_t aInnerWindowID, nsMixedContentBlockerMessageType aMessageType,
+ nsIURI* aRequestingLocation,
+ const nsACString& aOverruleMessageLookUpKeyWithThis = ""_ns) {
+ nsAutoCString messageCategory;
+ uint32_t severityFlag;
+ nsAutoCString messageLookupKey;
+
+ if (aMessageType == eBlocked) {
+ severityFlag = nsIScriptError::errorFlag;
+ messageCategory.AssignLiteral("Mixed Content Blocker");
+ if (aClassification == eMixedDisplay) {
+ messageLookupKey.AssignLiteral("BlockMixedDisplayContent");
+ } else {
+ messageLookupKey.AssignLiteral("BlockMixedActiveContent");
+ }
+ } else {
+ severityFlag = nsIScriptError::warningFlag;
+ messageCategory.AssignLiteral("Mixed Content Message");
+ if (aClassification == eMixedDisplay) {
+ messageLookupKey.AssignLiteral("LoadingMixedDisplayContent2");
+ } else {
+ messageLookupKey.AssignLiteral("LoadingMixedActiveContent2");
+ }
+ }
+
+ // if the callee explicitly wants to use a special message for this
+ // console report, then we allow to overrule the default with the
+ // explicitly provided one here.
+ if (!aOverruleMessageLookUpKeyWithThis.IsEmpty()) {
+ messageLookupKey = aOverruleMessageLookUpKeyWithThis;
+ }
+
+ nsAutoString localizedMsg;
+ AutoTArray<nsString, 1> params;
+ CopyUTF8toUTF16(aContentLocation->GetSpecOrDefault(),
+ *params.AppendElement());
+ nsContentUtils::FormatLocalizedString(nsContentUtils::eSECURITY_PROPERTIES,
+ messageLookupKey.get(), params,
+ localizedMsg);
+
+ nsContentUtils::ReportToConsoleByWindowID(localizedMsg, severityFlag,
+ messageCategory, aInnerWindowID,
+ aRequestingLocation);
+}
+
+/* nsIChannelEventSink implementation
+ * This code is called when a request is redirected.
+ * We check the channel associated with the new uri is allowed to load
+ * in the current context
+ */
+NS_IMETHODIMP
+nsMixedContentBlocker::AsyncOnChannelRedirect(
+ nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aFlags,
+ nsIAsyncVerifyRedirectCallback* aCallback) {
+ mozilla::net::nsAsyncRedirectAutoCallback autoCallback(aCallback);
+
+ if (!aOldChannel) {
+ NS_ERROR("No channel when evaluating mixed content!");
+ return NS_ERROR_FAILURE;
+ }
+
+ // If we are in the parent process in e10s, we don't have access to the
+ // document node, and hence ShouldLoad will fail when we try to get
+ // the docShell. If that's the case, ignore mixed content checks
+ // on redirects in the parent. Let the child check for mixed content.
+ nsCOMPtr<nsIParentChannel> is_ipc_channel;
+ NS_QueryNotificationCallbacks(aNewChannel, is_ipc_channel);
+ RefPtr<net::DocumentLoadListener> docListener =
+ do_QueryObject(is_ipc_channel);
+ if (is_ipc_channel && !docListener) {
+ return NS_OK;
+ }
+
+ // Don't do these checks if we're switching from DocumentChannel
+ // to a real channel. In that case, we should already have done
+ // the checks in the parent process. AsyncOnChannelRedirect
+ // isn't called in the content process if we switch process,
+ // so checking here would just hide bugs in the process switch
+ // cases.
+ if (RefPtr<net::DocumentChannel> docChannel = do_QueryObject(aOldChannel)) {
+ return NS_OK;
+ }
+
+ nsresult rv;
+ nsCOMPtr<nsIURI> oldUri;
+ rv = aOldChannel->GetURI(getter_AddRefs(oldUri));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIURI> newUri;
+ rv = aNewChannel->GetURI(getter_AddRefs(newUri));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ // Get the loading Info from the old channel
+ nsCOMPtr<nsILoadInfo> loadInfo = aOldChannel->LoadInfo();
+ nsCOMPtr<nsIPrincipal> requestingPrincipal = loadInfo->GetLoadingPrincipal();
+
+ // Since we are calling shouldLoad() directly on redirects, we don't go
+ // through the code in nsContentPolicyUtils::NS_CheckContentLoadPolicy().
+ // Hence, we have to duplicate parts of it here.
+ if (requestingPrincipal) {
+ // We check to see if the loadingPrincipal is systemPrincipal and return
+ // early if it is
+ if (requestingPrincipal->IsSystemPrincipal()) {
+ return NS_OK;
+ }
+ }
+
+ int16_t decision = REJECT_REQUEST;
+ rv = ShouldLoad(newUri, loadInfo,
+ ""_ns, // aMimeGuess
+ &decision);
+ if (NS_FAILED(rv)) {
+ autoCallback.DontCallback();
+ aOldChannel->Cancel(NS_ERROR_DOM_BAD_URI);
+ return NS_BINDING_FAILED;
+ }
+
+ // If the channel is about to load mixed content, abort the channel
+ if (!NS_CP_ACCEPTED(decision)) {
+ autoCallback.DontCallback();
+ aOldChannel->Cancel(NS_ERROR_DOM_BAD_URI);
+ return NS_BINDING_FAILED;
+ }
+
+ return NS_OK;
+}
+
+/* This version of ShouldLoad() is non-static and called by the Content Policy
+ * API and AsyncOnChannelRedirect(). See nsIContentPolicy::ShouldLoad()
+ * for detailed description of the parameters.
+ */
+NS_IMETHODIMP
+nsMixedContentBlocker::ShouldLoad(nsIURI* aContentLocation,
+ nsILoadInfo* aLoadInfo,
+ const nsACString& aMimeGuess,
+ int16_t* aDecision) {
+ // We pass in false as the first parameter to ShouldLoad(), because the
+ // callers of this method don't know whether the load went through cached
+ // image redirects. This is handled by direct callers of the static
+ // ShouldLoad.
+ nsresult rv =
+ ShouldLoad(false, // aHadInsecureImageRedirect
+ aContentLocation, aLoadInfo, aMimeGuess, true, aDecision);
+
+ if (*aDecision == nsIContentPolicy::REJECT_REQUEST) {
+ NS_SetRequestBlockingReason(aLoadInfo,
+ nsILoadInfo::BLOCKING_REASON_MIXED_BLOCKED);
+ }
+
+ return rv;
+}
+
+bool nsMixedContentBlocker::IsPotentiallyTrustworthyLoopbackHost(
+ const nsACString& aAsciiHost) {
+ if (mozilla::net::IsLoopbackHostname(aAsciiHost)) {
+ return true;
+ }
+
+ using namespace mozilla::net;
+ NetAddr addr;
+ if (NS_FAILED(addr.InitFromString(aAsciiHost))) {
+ return false;
+ }
+
+ // Step 4 of
+ // https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy says
+ // we should only consider [::1]/128 as a potentially trustworthy IPv6
+ // address, whereas for IPv4 127.0.0.1/8 are considered as potentially
+ // trustworthy.
+ return addr.IsLoopBackAddressWithoutIPv6Mapping();
+}
+
+bool nsMixedContentBlocker::IsPotentiallyTrustworthyLoopbackURL(nsIURI* aURL) {
+ if (!aURL) {
+ return false;
+ }
+ nsAutoCString asciiHost;
+ nsresult rv = aURL->GetAsciiHost(asciiHost);
+ NS_ENSURE_SUCCESS(rv, false);
+ return IsPotentiallyTrustworthyLoopbackHost(asciiHost);
+}
+
+/* Maybe we have a .onion URL. Treat it as trustworthy as well if
+ * `dom.securecontext.allowlist_onions` is `true`.
+ */
+bool nsMixedContentBlocker::IsPotentiallyTrustworthyOnion(nsIURI* aURL) {
+ if (!StaticPrefs::dom_securecontext_allowlist_onions()) {
+ return false;
+ }
+
+ nsAutoCString host;
+ nsresult rv = aURL->GetHost(host);
+ NS_ENSURE_SUCCESS(rv, false);
+ return StringEndsWith(host, ".onion"_ns);
+}
+
+// static
+void nsMixedContentBlocker::OnPrefChange(const char* aPref, void* aClosure) {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(!strcmp(aPref, "dom.securecontext.allowlist"));
+ Preferences::GetCString("dom.securecontext.allowlist",
+ *sSecurecontextAllowlist);
+}
+
+// static
+void nsMixedContentBlocker::GetSecureContextAllowList(nsACString& aList) {
+ MOZ_ASSERT(NS_IsMainThread());
+ if (!sSecurecontextAllowlistCached) {
+ MOZ_ASSERT(!sSecurecontextAllowlist);
+ sSecurecontextAllowlistCached = true;
+ sSecurecontextAllowlist = new nsCString();
+ Preferences::RegisterCallbackAndCall(OnPrefChange,
+ "dom.securecontext.allowlist");
+ }
+ aList = *sSecurecontextAllowlist;
+}
+
+// static
+void nsMixedContentBlocker::Shutdown() {
+ if (sSecurecontextAllowlist) {
+ delete sSecurecontextAllowlist;
+ sSecurecontextAllowlist = nullptr;
+ }
+}
+
+bool nsMixedContentBlocker::IsPotentiallyTrustworthyOrigin(nsIURI* aURI) {
+ // The following implements:
+ // https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy
+
+ nsAutoCString scheme;
+ nsresult rv = aURI->GetScheme(scheme);
+ if (NS_FAILED(rv)) {
+ return false;
+ }
+
+ // Blobs are expected to inherit their principal so we don't expect to have
+ // a content 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.
+ // We use nsIProtocolHandler flags to determine which protocols we consider a
+ // priori authenticated.
+ bool aPrioriAuthenticated = false;
+ if (NS_FAILED(NS_URIChainHasFlags(
+ aURI, nsIProtocolHandler::URI_IS_POTENTIALLY_TRUSTWORTHY,
+ &aPrioriAuthenticated))) {
+ return false;
+ }
+
+ if (aPrioriAuthenticated) {
+ return true;
+ }
+
+ nsAutoCString host;
+ rv = aURI->GetHost(host);
+ if (NS_FAILED(rv)) {
+ return false;
+ }
+
+ if (IsPotentiallyTrustworthyLoopbackURL(aURI)) {
+ return true;
+ }
+
+ // If a host is not considered secure according to the default algorithm, then
+ // check to see if it has been allowlisted by the user. We only apply this
+ // allowlist 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")) {
+ return false;
+ }
+
+ nsAutoCString allowlist;
+ GetSecureContextAllowList(allowlist);
+ for (const nsACString& allowedHost :
+ nsCCharSeparatedTokenizer(allowlist, ',').ToRange()) {
+ if (host.Equals(allowedHost)) {
+ return true;
+ }
+ }
+
+ // Maybe we have a .onion URL. Treat it as trustworthy as well if
+ // `dom.securecontext.allowlist_onions` is `true`.
+ if (nsMixedContentBlocker::IsPotentiallyTrustworthyOnion(aURI)) {
+ return true;
+ }
+ return false;
+}
+
+/* static */
+bool nsMixedContentBlocker::IsUpgradableContentType(nsContentPolicyType aType) {
+ MOZ_ASSERT(NS_IsMainThread());
+ return (aType == nsIContentPolicy::TYPE_INTERNAL_IMAGE ||
+ aType == nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD ||
+ aType == nsIContentPolicy::TYPE_INTERNAL_AUDIO ||
+ aType == nsIContentPolicy::TYPE_INTERNAL_VIDEO);
+}
+
+/*
+ * Return the URI of the precusor principal or the URI of aPrincipal if there is
+ * no precursor URI.
+ */
+static already_AddRefed<nsIURI> GetPrincipalURIOrPrecursorPrincipalURI(
+ nsIPrincipal* aPrincipal) {
+ nsCOMPtr<nsIURI> precursorURI = nullptr;
+ if (aPrincipal->GetIsNullPrincipal()) {
+ nsCOMPtr<nsIPrincipal> precursorPrin = aPrincipal->GetPrecursorPrincipal();
+ precursorURI = precursorPrin ? precursorPrin->GetURI() : nullptr;
+ }
+
+ return precursorURI ? precursorURI.forget() : aPrincipal->GetURI();
+}
+
+/* Static version of ShouldLoad() that contains all the Mixed Content Blocker
+ * logic. Called from non-static ShouldLoad().
+ */
+nsresult nsMixedContentBlocker::ShouldLoad(bool aHadInsecureImageRedirect,
+ nsIURI* aContentLocation,
+ nsILoadInfo* aLoadInfo,
+ const nsACString& aMimeGuess,
+ bool aReportError,
+ int16_t* aDecision) {
+ // Asserting that we are on the main thread here and hence do not have to lock
+ // and unlock security.mixed_content.block_active_content and
+ // security.mixed_content.block_display_content before reading/writing to
+ // them.
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (MOZ_UNLIKELY(MOZ_LOG_TEST(sMCBLog, LogLevel::Verbose))) {
+ nsAutoCString asciiUrl;
+ aContentLocation->GetAsciiSpec(asciiUrl);
+ MOZ_LOG(sMCBLog, LogLevel::Verbose, ("shouldLoad:"));
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - contentLocation: %s", asciiUrl.get()));
+ }
+
+ nsContentPolicyType internalContentType =
+ aLoadInfo->InternalContentPolicyType();
+ nsCOMPtr<nsIPrincipal> loadingPrincipal = aLoadInfo->GetLoadingPrincipal();
+ nsCOMPtr<nsIPrincipal> triggeringPrincipal = aLoadInfo->TriggeringPrincipal();
+
+ if (MOZ_UNLIKELY(MOZ_LOG_TEST(sMCBLog, LogLevel::Verbose))) {
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - internalContentPolicyType: %s",
+ NS_CP_ContentTypeName(internalContentType)));
+
+ if (loadingPrincipal != nullptr) {
+ nsAutoCString loadingPrincipalAsciiUrl;
+ loadingPrincipal->GetAsciiSpec(loadingPrincipalAsciiUrl);
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - loadingPrincipal: %s", loadingPrincipalAsciiUrl.get()));
+ } else {
+ MOZ_LOG(sMCBLog, LogLevel::Verbose, (" - loadingPrincipal: (nullptr)"));
+ }
+
+ nsAutoCString triggeringPrincipalAsciiUrl;
+ triggeringPrincipal->GetAsciiSpec(triggeringPrincipalAsciiUrl);
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - triggeringPrincipal: %s", triggeringPrincipalAsciiUrl.get()));
+ }
+
+ RefPtr<WindowContext> requestingWindow =
+ WindowContext::GetById(aLoadInfo->GetInnerWindowID());
+
+ bool isPreload = nsContentUtils::IsPreloadType(internalContentType);
+
+ // The content policy type that we receive may be an internal type for
+ // scripts. Let's remember if we have seen a worker type, and reset it to the
+ // external type in all cases right now.
+ bool isWorkerType =
+ internalContentType == nsIContentPolicy::TYPE_INTERNAL_WORKER ||
+ internalContentType ==
+ nsIContentPolicy::TYPE_INTERNAL_WORKER_STATIC_MODULE ||
+ internalContentType == nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER ||
+ internalContentType == nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER;
+ ExtContentPolicyType contentType =
+ nsContentUtils::InternalContentPolicyTypeToExternal(internalContentType);
+
+ // Assume active (high risk) content and blocked by default
+ MixedContentTypes classification = eMixedScript;
+ // Make decision to block/reject by default
+ *aDecision = REJECT_REQUEST;
+
+ // Notes on non-obvious decisions:
+ //
+ // TYPE_DTD: A DTD can contain entity definitions that expand to scripts.
+ //
+ // TYPE_FONT: The TrueType hinting mechanism is basically a scripting
+ // language that gets interpreted by the operating system's font rasterizer.
+ // Mixed content web fonts are relatively uncommon, and we can can fall back
+ // to built-in fonts with minimal disruption in almost all cases.
+ //
+ // TYPE_OBJECT_SUBREQUEST could actually be either active content (e.g. a
+ // script that a plugin will execute) or display content (e.g. Flash video
+ // content). Until we have a way to determine active vs passive content
+ // from plugin requests (bug 836352), we will treat this as passive content.
+ // This is to prevent false positives from causing users to become
+ // desensitized to the mixed content blocker.
+ //
+ // TYPE_CSP_REPORT: High-risk because they directly leak information about
+ // the content of the page, and because blocking them does not have any
+ // negative effect on the page loading.
+ //
+ // TYPE_PING: Ping requests are POSTS, not GETs like images and media.
+ // Also, PING requests have no bearing on the rendering or operation of
+ // the page when used as designed, so even though they are lower risk than
+ // scripts, blocking them is basically risk-free as far as compatibility is
+ // concerned.
+ //
+ // TYPE_STYLESHEET: XSLT stylesheets can insert scripts. CSS positioning
+ // and other advanced CSS features can possibly be exploited to cause
+ // spoofing attacks (e.g. make a "grant permission" button look like a
+ // "refuse permission" button).
+ //
+ // TYPE_BEACON: Beacon requests are similar to TYPE_PING, and are blocked by
+ // default.
+ //
+ // TYPE_WEBSOCKET: The Websockets API requires browsers to
+ // reject mixed-content websockets: "If secure is false but the origin of
+ // the entry script has a scheme component that is itself a secure protocol,
+ // e.g. HTTPS, then throw a SecurityError exception." We already block mixed
+ // content websockets within the websockets implementation, so we don't need
+ // to do any blocking here, nor do we need to provide a way to undo or
+ // override the blocking. Websockets without TLS are very flaky anyway in the
+ // face of many HTTP-aware proxies. Compared to passive content, there is
+ // additional risk that the script using WebSockets will disclose sensitive
+ // information from the HTTPS page and/or eval (directly or indirectly)
+ // received data.
+ //
+ // TYPE_XMLHTTPREQUEST: XHR requires either same origin or CORS, so most
+ // mixed-content XHR will already be blocked by that check. This will also
+ // block HTTPS-to-HTTP XHR with CORS. The same security concerns mentioned
+ // above for WebSockets apply to XHR, and XHR should have the same security
+ // properties as WebSockets w.r.t. mixed content. XHR's handling of redirects
+ // amplifies these concerns.
+ //
+ // TYPE_PROXIED_WEBRTC_MEDIA: Ordinarily, webrtc uses low-level sockets for
+ // peer-to-peer media, which bypasses this code entirely. However, when a
+ // web proxy is being used, the TCP and TLS webrtc connections are routed
+ // through the web proxy (using HTTP CONNECT), which causes these connections
+ // to be checked. We just skip mixed content blocking in that case.
+
+ switch (contentType) {
+ // The top-level document cannot be mixed content by definition
+ case ExtContentPolicy::TYPE_DOCUMENT:
+ *aDecision = ACCEPT;
+ return NS_OK;
+ // Creating insecure websocket connections in a secure page is blocked
+ // already in the websocket constructor. We don't need to check the blocking
+ // here and we don't want to un-block
+ case ExtContentPolicy::TYPE_WEBSOCKET:
+ *aDecision = ACCEPT;
+ return NS_OK;
+
+ // TYPE_SAVEAS_DOWNLOAD: Save-link-as feature is used to download a
+ // resource
+ // without involving a docShell. This kind of loading must be
+ // allowed, if not disabled in the preferences.
+ // Creating insecure connections for a save-as link download is
+ // acceptable. This download is completely disconnected from the docShell,
+ // but still using the same loading principal.
+
+ case ExtContentPolicy::TYPE_SAVEAS_DOWNLOAD:
+ *aDecision = ACCEPT;
+ return NS_OK;
+ break;
+
+ // It does not make sense to subject webrtc media connections to mixed
+ // content blocking, since those connections are peer-to-peer and will
+ // therefore almost never match the origin.
+ case ExtContentPolicy::TYPE_PROXIED_WEBRTC_MEDIA:
+ *aDecision = ACCEPT;
+ return NS_OK;
+
+ // Static display content is considered moderate risk for mixed content so
+ // these will be blocked according to the mixed display preference
+ case ExtContentPolicy::TYPE_IMAGE:
+ case ExtContentPolicy::TYPE_MEDIA:
+ classification = eMixedDisplay;
+ break;
+ case ExtContentPolicy::TYPE_OBJECT_SUBREQUEST:
+ if (StaticPrefs::security_mixed_content_block_object_subrequest()) {
+ classification = eMixedScript;
+ } else {
+ classification = eMixedDisplay;
+ }
+ break;
+
+ // Active content (or content with a low value/risk-of-blocking ratio)
+ // that has been explicitly evaluated; listed here for documentation
+ // purposes and to avoid the assertion and warning for the default case.
+ case ExtContentPolicy::TYPE_BEACON:
+ case ExtContentPolicy::TYPE_CSP_REPORT:
+ case ExtContentPolicy::TYPE_DTD:
+ case ExtContentPolicy::TYPE_FETCH:
+ case ExtContentPolicy::TYPE_FONT:
+ case ExtContentPolicy::TYPE_UA_FONT:
+ case ExtContentPolicy::TYPE_IMAGESET:
+ case ExtContentPolicy::TYPE_OBJECT:
+ case ExtContentPolicy::TYPE_SCRIPT:
+ case ExtContentPolicy::TYPE_STYLESHEET:
+ case ExtContentPolicy::TYPE_SUBDOCUMENT:
+ case ExtContentPolicy::TYPE_PING:
+ case ExtContentPolicy::TYPE_WEB_MANIFEST:
+ case ExtContentPolicy::TYPE_XMLHTTPREQUEST:
+ case ExtContentPolicy::TYPE_XSLT:
+ case ExtContentPolicy::TYPE_OTHER:
+ case ExtContentPolicy::TYPE_SPECULATIVE:
+ break;
+
+ case ExtContentPolicy::TYPE_INVALID:
+ MOZ_ASSERT(false, "Mixed content of unknown type");
+ // Do not add default: so that compilers can catch the missing case.
+ }
+
+ // Make sure to get the URI the load started with. No need to check
+ // outer schemes because all the wrapping pseudo protocols inherit the
+ // security properties of the actual network request represented
+ // by the innerMost URL.
+ nsCOMPtr<nsIURI> innerContentLocation = NS_GetInnermostURI(aContentLocation);
+ if (!innerContentLocation) {
+ NS_ERROR("Can't get innerURI from aContentLocation");
+ *aDecision = REJECT_REQUEST;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected because the innermost "
+ "URI could not be "
+ "retrieved"));
+ return NS_OK;
+ }
+
+ // TYPE_IMAGE redirects are cached based on the original URI, not the final
+ // destination and hence cache hits for images may not have the correct
+ // innerContentLocation. Check if the cached hit went through an http
+ // redirect, and if it did, we can't treat this as a secure subresource.
+ if (!aHadInsecureImageRedirect &&
+ URISafeToBeLoadedInSecureContext(innerContentLocation)) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+
+ /*
+ * Most likely aLoadingPrincipal reflects the security context of the owning
+ * document for this mixed content check. There are cases where that is not
+ * true, hence we have to we process requests in the following order:
+ * 1) If the load is triggered by the SystemPrincipal, we allow the load.
+ * Content scripts from addon code do provide aTriggeringPrincipal, which
+ * is an ExpandedPrincipal. If encountered, we allow the load.
+ * 2) If aLoadingPrincipal does not yield to a requestingLocation, then we
+ * fall back to querying the requestingLocation from aTriggeringPrincipal.
+ * 3) If we still end up not having a requestingLocation, we reject the load.
+ */
+
+ // 1) Check if the load was triggered by the system (SystemPrincipal) or
+ // a content script from addons code (ExpandedPrincipal) in which case the
+ // load is not subject to mixed content blocking.
+ if (triggeringPrincipal) {
+ if (triggeringPrincipal->IsSystemPrincipal()) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+ nsCOMPtr<nsIExpandedPrincipal> expanded =
+ do_QueryInterface(triggeringPrincipal);
+ if (expanded) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+ }
+
+ // 2) If aLoadingPrincipal does not provide a requestingLocation, then
+ // we fall back to to querying the requestingLocation from
+ // aTriggeringPrincipal.
+ nsCOMPtr<nsIURI> requestingLocation;
+ auto* baseLoadingPrincipal = BasePrincipal::Cast(loadingPrincipal);
+ if (baseLoadingPrincipal) {
+ requestingLocation =
+ GetPrincipalURIOrPrecursorPrincipalURI(baseLoadingPrincipal);
+ }
+ if (!requestingLocation) {
+ auto* baseTriggeringPrincipal = BasePrincipal::Cast(triggeringPrincipal);
+ if (baseTriggeringPrincipal) {
+ requestingLocation =
+ GetPrincipalURIOrPrecursorPrincipalURI(baseTriggeringPrincipal);
+ }
+ }
+
+ // 3) Giving up. We still don't have a requesting location, therefore we can't
+ // tell if this is a mixed content load. Deny to be safe.
+ if (!requestingLocation) {
+ *aDecision = REJECT_REQUEST;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected because no requesting "
+ "location could be "
+ "gathered."));
+ return NS_OK;
+ }
+
+ // Check the parent scheme. If it is not an HTTPS page then mixed content
+ // restrictions do not apply.
+ nsCOMPtr<nsIURI> innerRequestingLocation =
+ NS_GetInnermostURI(requestingLocation);
+ if (!innerRequestingLocation) {
+ NS_ERROR("Can't get innerURI from requestingLocation");
+ *aDecision = REJECT_REQUEST;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected because the innermost "
+ "URI of the "
+ "requesting location could be gathered."));
+ return NS_OK;
+ }
+
+ bool parentIsHttps = innerRequestingLocation->SchemeIs("https");
+ if (!parentIsHttps) {
+ *aDecision = ACCEPT;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be allowed because the requesting "
+ "location is not using "
+ "HTTPS."));
+ return NS_OK;
+ }
+
+ // Disallow mixed content loads for workers, shared workers and service
+ // workers.
+ if (isWorkerType) {
+ // For workers, we can assume that we're mixed content at this point, since
+ // the parent is https, and the protocol associated with
+ // innerContentLocation doesn't map to the secure URI flags checked above.
+ // Assert this for sanity's sake
+#ifdef DEBUG
+ bool isHttpsScheme = innerContentLocation->SchemeIs("https");
+ MOZ_ASSERT(!isHttpsScheme);
+#endif
+ *aDecision = REJECT_REQUEST;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected, trying to load a worker "
+ "from an insecure origin."));
+ return NS_OK;
+ }
+
+ bool isHttpScheme = innerContentLocation->SchemeIs("http");
+ if (isHttpScheme && IsPotentiallyTrustworthyOrigin(innerContentLocation)) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+
+ // Check if https-only mode upgrades this later anyway
+ if (nsHTTPSOnlyUtils::IsSafeToAcceptCORSOrMixedContent(aLoadInfo)) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+
+ // The page might have set the CSP directive 'upgrade-insecure-requests'. In
+ // such a case allow the http: load to succeed with the promise that the
+ // channel will get upgraded to https before fetching any data from the
+ // netwerk. Please see: nsHttpChannel::Connect()
+ //
+ // Please note that the CSP directive 'upgrade-insecure-requests' only applies
+ // to http: and ws: (for websockets). Websockets are not subject to mixed
+ // content blocking since insecure websockets are not allowed within secure
+ // pages. Hence, we only have to check against http: here. Skip mixed content
+ // blocking if the subresource load uses http: and the CSP directive
+ // 'upgrade-insecure-requests' is present on the page.
+
+ // Carve-out: if we're in the parent and we're loading media, e.g. through
+ // webbrowserpersist, don't reject it if we can't find a docshell.
+ if (XRE_IsParentProcess() && !requestingWindow &&
+ (contentType == ExtContentPolicy::TYPE_IMAGE ||
+ contentType == ExtContentPolicy::TYPE_MEDIA)) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+ // Otherwise, we must have a window
+ NS_ENSURE_TRUE(requestingWindow, NS_OK);
+
+ if (isHttpScheme && aLoadInfo->GetUpgradeInsecureRequests()) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+
+ // Allow http: mixed content if we are choosing to upgrade them when the
+ // pref "security.mixed_content.upgrade_display_content" is true.
+ // This behaves like GetUpgradeInsecureRequests above in that the channel will
+ // be upgraded to https before fetching any data from the netwerk.
+ if (isHttpScheme) {
+ bool isUpgradableContentType =
+ IsUpgradableContentType(internalContentType) &&
+ StaticPrefs::security_mixed_content_upgrade_display_content();
+ if (isUpgradableContentType) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+ }
+
+ // The page might have set the CSP directive 'block-all-mixed-content' which
+ // should block not only active mixed content loads but in fact all mixed
+ // content loads, see https://www.w3.org/TR/mixed-content/#strict-checking
+ // Block all non secure loads in case the CSP directive is present. Please
+ // note that at this point we already know, based on |schemeSecure| that the
+ // load is not secure, so we can bail out early at this point.
+ if (aLoadInfo->GetBlockAllMixedContent()) {
+ // log a message to the console before returning.
+ nsAutoCString spec;
+ nsresult rv = aContentLocation->GetSpec(spec);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ AutoTArray<nsString, 1> params;
+ CopyUTF8toUTF16(spec, *params.AppendElement());
+
+ CSP_LogLocalizedStr("blockAllMixedContent", params,
+ u""_ns, // aSourceFile
+ u""_ns, // aScriptSample
+ 0, // aLineNumber
+ 0, // aColumnNumber
+ nsIScriptError::errorFlag, "blockAllMixedContent"_ns,
+ requestingWindow->Id(),
+ !!aLoadInfo->GetOriginAttributes().mPrivateBrowsingId);
+ *aDecision = REJECT_REQUEST;
+ MOZ_LOG(
+ sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected because the CSP directive "
+ "'block-all-mixed-content' was set while trying to load data from "
+ "a non-secure origin."));
+ return NS_OK;
+ }
+
+ // Determine if the rootDoc is https and if the user decided to allow Mixed
+ // Content
+ WindowContext* topWC = requestingWindow->TopWindowContext();
+ bool rootHasSecureConnection = topWC->GetIsSecure();
+ bool allowMixedContent = topWC->GetAllowMixedContent();
+
+ // When navigating an iframe, the iframe may be https
+ // but its parents may not be. Check the parents to see if any of them are
+ // https. If none of the parents are https, allow the load.
+ if (contentType == ExtContentPolicyType::TYPE_SUBDOCUMENT &&
+ !rootHasSecureConnection) {
+ bool httpsParentExists = false;
+
+ RefPtr<WindowContext> curWindow = requestingWindow;
+ while (!httpsParentExists && curWindow) {
+ httpsParentExists = curWindow->GetIsSecure();
+ curWindow = curWindow->GetParentWindowContext();
+ }
+
+ if (!httpsParentExists) {
+ *aDecision = nsIContentPolicy::ACCEPT;
+ return NS_OK;
+ }
+ }
+
+ OriginAttributes originAttributes;
+ if (loadingPrincipal) {
+ originAttributes = loadingPrincipal->OriginAttributesRef();
+ } else if (triggeringPrincipal) {
+ originAttributes = triggeringPrincipal->OriginAttributesRef();
+ }
+
+ // At this point we know that the request is mixed content, and the only
+ // question is whether we block it. Record telemetry at this point as to
+ // whether HSTS would have fixed things by making the content location
+ // into an HTTPS URL.
+ //
+ // Note that we count this for redirects as well as primary requests. This
+ // will cause some degree of double-counting, especially when mixed content
+ // is not blocked (e.g., for images). For more detail, see:
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=1198572#c19
+ //
+ // We do not count requests aHadInsecureImageRedirect=true, since these are
+ // just an artifact of the image caching system.
+ bool active = (classification == eMixedScript);
+ if (!aHadInsecureImageRedirect) {
+ if (XRE_IsParentProcess()) {
+ AccumulateMixedContentHSTS(innerContentLocation, active,
+ originAttributes);
+ } else {
+ // Ask the parent process to do the same call
+ mozilla::dom::ContentChild* cc =
+ mozilla::dom::ContentChild::GetSingleton();
+ if (cc) {
+ cc->SendAccumulateMixedContentHSTS(innerContentLocation, active,
+ originAttributes);
+ }
+ }
+ }
+
+ // set hasMixedContentObjectSubrequest on this object if necessary
+ if (contentType == ExtContentPolicyType::TYPE_OBJECT_SUBREQUEST &&
+ aReportError) {
+ if (!StaticPrefs::security_mixed_content_block_object_subrequest()) {
+ nsAutoCString messageLookUpKey(
+ "LoadingMixedDisplayObjectSubrequestDeprecation");
+
+ LogMixedContentMessage(classification, aContentLocation, topWC->Id(),
+ eUserOverride, requestingLocation,
+ messageLookUpKey);
+ }
+ }
+
+ uint32_t newState = 0;
+ // If the content is display content, and the pref says display content should
+ // be blocked, block it.
+ if (classification == eMixedDisplay) {
+ if (!StaticPrefs::security_mixed_content_block_display_content() ||
+ allowMixedContent) {
+ *aDecision = nsIContentPolicy::ACCEPT;
+ // User has overriden the pref and the root is not https;
+ // mixed display content was allowed on an https subframe.
+ newState |= nsIWebProgressListener::STATE_LOADED_MIXED_DISPLAY_CONTENT;
+ } else {
+ *aDecision = nsIContentPolicy::REJECT_REQUEST;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected because the content is "
+ "display "
+ "content (blocked by pref "
+ "security.mixed_content.block_display_content)."));
+ newState |= nsIWebProgressListener::STATE_BLOCKED_MIXED_DISPLAY_CONTENT;
+ }
+ } else {
+ MOZ_ASSERT(classification == eMixedScript);
+ // If the content is active content, and the pref says active content should
+ // be blocked, block it unless the user has choosen to override the pref
+ if (!StaticPrefs::security_mixed_content_block_active_content() ||
+ allowMixedContent) {
+ *aDecision = nsIContentPolicy::ACCEPT;
+ // User has already overriden the pref and the root is not https;
+ // mixed active content was allowed on an https subframe.
+ newState |= nsIWebProgressListener::STATE_LOADED_MIXED_ACTIVE_CONTENT;
+ } else {
+ // User has not overriden the pref by Disabling protection. Reject the
+ // request and update the security state.
+ *aDecision = nsIContentPolicy::REJECT_REQUEST;
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" -> decision: Request will be rejected because the content is "
+ "active "
+ "content (blocked by pref "
+ "security.mixed_content.block_active_content)."));
+ // The user has not overriden the pref, so make sure they still have an
+ // option by calling nativeDocShell which will invoke the doorhanger
+ newState |= nsIWebProgressListener::STATE_BLOCKED_MIXED_ACTIVE_CONTENT;
+ }
+ }
+
+ // To avoid duplicate errors on the console, we do not report blocked
+ // preloads to the console.
+ if (!isPreload && aReportError) {
+ LogMixedContentMessage(classification, aContentLocation, topWC->Id(),
+ (*aDecision == nsIContentPolicy::REJECT_REQUEST)
+ ? eBlocked
+ : eUserOverride,
+ requestingLocation);
+ }
+
+ // Notify the top WindowContext of the flags we've computed, and it
+ // will handle updating any relevant security UI.
+ topWC->AddSecurityState(newState);
+ return NS_OK;
+}
+
+bool nsMixedContentBlocker::URISafeToBeLoadedInSecureContext(nsIURI* aURI) {
+ /* Returns a bool if the URI can be loaded as a sub resource safely.
+ *
+ * Check Protocol Flags to determine if scheme is safe to load:
+ * URI_DOES_NOT_RETURN_DATA - e.g.
+ * "mailto"
+ * URI_IS_LOCAL_RESOURCE - e.g.
+ * "data",
+ * "resource",
+ * "moz-icon"
+ * URI_INHERITS_SECURITY_CONTEXT - e.g.
+ * "javascript"
+ * URI_IS_POTENTIALLY_TRUSTWORTHY - e.g.
+ * "https",
+ * "moz-safe-about"
+ *
+ */
+ bool schemeLocal = false;
+ bool schemeNoReturnData = false;
+ bool schemeInherits = false;
+ bool schemeSecure = false;
+ if (NS_FAILED(NS_URIChainHasFlags(
+ aURI, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE, &schemeLocal)) ||
+ NS_FAILED(NS_URIChainHasFlags(
+ aURI, nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA,
+ &schemeNoReturnData)) ||
+ NS_FAILED(NS_URIChainHasFlags(
+ aURI, nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT,
+ &schemeInherits)) ||
+ NS_FAILED(NS_URIChainHasFlags(
+ aURI, nsIProtocolHandler::URI_IS_POTENTIALLY_TRUSTWORTHY,
+ &schemeSecure))) {
+ return false;
+ }
+
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - URISafeToBeLoadedInSecureContext:"));
+ MOZ_LOG(sMCBLog, LogLevel::Verbose, (" - schemeLocal: %i", schemeLocal));
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - schemeNoReturnData: %i", schemeNoReturnData));
+ MOZ_LOG(sMCBLog, LogLevel::Verbose,
+ (" - schemeInherits: %i", schemeInherits));
+ MOZ_LOG(sMCBLog, LogLevel::Verbose, (" - schemeSecure: %i", schemeSecure));
+ return (schemeLocal || schemeNoReturnData || schemeInherits || schemeSecure);
+}
+
+NS_IMETHODIMP
+nsMixedContentBlocker::ShouldProcess(nsIURI* aContentLocation,
+ nsILoadInfo* aLoadInfo,
+ const nsACString& aMimeGuess,
+ int16_t* aDecision) {
+ if (!aContentLocation) {
+ // aContentLocation may be null when a plugin is loading without an
+ // associated URI resource
+ if (aLoadInfo->GetExternalContentPolicyType() ==
+ ExtContentPolicyType::TYPE_OBJECT) {
+ *aDecision = ACCEPT;
+ return NS_OK;
+ }
+
+ NS_SetRequestBlockingReason(aLoadInfo,
+ nsILoadInfo::BLOCKING_REASON_MIXED_BLOCKED);
+ *aDecision = REJECT_REQUEST;
+ return NS_ERROR_FAILURE;
+ }
+
+ return ShouldLoad(aContentLocation, aLoadInfo, aMimeGuess, aDecision);
+}
+
+// Record information on when HSTS would have made mixed content not mixed
+// content (regardless of whether it was actually blocked)
+void nsMixedContentBlocker::AccumulateMixedContentHSTS(
+ nsIURI* aURI, bool aActive, const OriginAttributes& aOriginAttributes) {
+ // This method must only be called in the parent, because
+ // nsSiteSecurityService is only available in the parent
+ if (!XRE_IsParentProcess()) {
+ MOZ_ASSERT(false);
+ return;
+ }
+
+ bool hsts;
+ nsresult rv;
+ nsCOMPtr<nsISiteSecurityService> sss =
+ do_GetService(NS_SSSERVICE_CONTRACTID, &rv);
+ if (NS_FAILED(rv)) {
+ return;
+ }
+ rv = sss->IsSecureURI(aURI, aOriginAttributes, &hsts);
+ if (NS_FAILED(rv)) {
+ return;
+ }
+
+ // states: would upgrade, would prime, hsts info cached
+ // active, passive
+ //
+ if (!aActive) {
+ if (!hsts) {
+ Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
+ MCB_HSTS_PASSIVE_NO_HSTS);
+ } else {
+ Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
+ MCB_HSTS_PASSIVE_WITH_HSTS);
+ }
+ } else {
+ if (!hsts) {
+ Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
+ MCB_HSTS_ACTIVE_NO_HSTS);
+ } else {
+ Telemetry::Accumulate(Telemetry::MIXED_CONTENT_HSTS,
+ MCB_HSTS_ACTIVE_WITH_HSTS);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 23:50:32 +0000