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-rw-r--r--netwerk/protocol/about/nsAboutProtocolHandler.cpp414
1 files changed, 414 insertions, 0 deletions
diff --git a/netwerk/protocol/about/nsAboutProtocolHandler.cpp b/netwerk/protocol/about/nsAboutProtocolHandler.cpp
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index 0000000000..fe69c7ec02
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+++ b/netwerk/protocol/about/nsAboutProtocolHandler.cpp
@@ -0,0 +1,414 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#include "base/basictypes.h"
+#include "mozilla/ArrayUtils.h"
+
+#include "nsAboutProtocolHandler.h"
+#include "nsIURI.h"
+#include "nsIAboutModule.h"
+#include "nsContentUtils.h"
+#include "nsString.h"
+#include "nsNetCID.h"
+#include "nsAboutProtocolUtils.h"
+#include "nsError.h"
+#include "nsNetUtil.h"
+#include "nsIObjectInputStream.h"
+#include "nsIObjectOutputStream.h"
+#include "nsIWritablePropertyBag2.h"
+#include "nsIChannel.h"
+#include "nsIScriptError.h"
+#include "nsIClassInfoImpl.h"
+
+#include "mozilla/ipc/URIUtils.h"
+
+namespace mozilla {
+namespace net {
+
+static NS_DEFINE_CID(kNestedAboutURICID, NS_NESTEDABOUTURI_CID);
+
+static bool IsSafeForUntrustedContent(nsIAboutModule* aModule, nsIURI* aURI) {
+ uint32_t flags;
+ nsresult rv = aModule->GetURIFlags(aURI, &flags);
+ NS_ENSURE_SUCCESS(rv, false);
+
+ return (flags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) != 0;
+}
+
+static bool IsSafeToLinkForUntrustedContent(nsIURI* aURI) {
+ nsAutoCString path;
+ aURI->GetPathQueryRef(path);
+
+ int32_t f = path.FindChar('#');
+ if (f >= 0) {
+ path.SetLength(f);
+ }
+
+ f = path.FindChar('?');
+ if (f >= 0) {
+ path.SetLength(f);
+ }
+
+ ToLowerCase(path);
+
+ // The about modules for these URL types have the
+ // URI_SAFE_FOR_UNTRUSTED_CONTENT and MAKE_LINKABLE flags set.
+ return path.EqualsLiteral("blank") || path.EqualsLiteral("logo") ||
+ path.EqualsLiteral("srcdoc");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMPL_ISUPPORTS(nsAboutProtocolHandler, nsIProtocolHandler,
+ nsIProtocolHandlerWithDynamicFlags, nsISupportsWeakReference)
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIProtocolHandler methods:
+
+NS_IMETHODIMP
+nsAboutProtocolHandler::GetScheme(nsACString& result) {
+ result.AssignLiteral("about");
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAboutProtocolHandler::GetFlagsForURI(nsIURI* aURI, uint32_t* aFlags) {
+ // First use the default (which is "unsafe for content"):
+ *aFlags = URI_NORELATIVE | URI_NOAUTH | URI_DANGEROUS_TO_LOAD |
+ URI_SCHEME_NOT_SELF_LINKABLE;
+
+ // Now try to see if this URI overrides the default:
+ nsCOMPtr<nsIAboutModule> aboutMod;
+ nsresult rv = NS_GetAboutModule(aURI, getter_AddRefs(aboutMod));
+ if (NS_FAILED(rv)) {
+ // Swallow this and just tell the consumer the default:
+ return NS_OK;
+ }
+ uint32_t aboutModuleFlags = 0;
+ rv = aboutMod->GetURIFlags(aURI, &aboutModuleFlags);
+ // This should never happen, so pass back the error:
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ // Secure (https) pages can load safe about pages without becoming
+ // mixed content.
+ if (aboutModuleFlags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) {
+ *aFlags |= URI_IS_POTENTIALLY_TRUSTWORTHY;
+ // about: pages can only be loaded by unprivileged principals
+ // if they are marked as LINKABLE
+ if (aboutModuleFlags & nsIAboutModule::MAKE_LINKABLE) {
+ // Replace URI_DANGEROUS_TO_LOAD with URI_LOADABLE_BY_ANYONE.
+ *aFlags &= ~URI_DANGEROUS_TO_LOAD;
+ *aFlags |= URI_LOADABLE_BY_ANYONE;
+ }
+ }
+ return NS_OK;
+}
+
+// static
+nsresult nsAboutProtocolHandler::CreateNewURI(const nsACString& aSpec,
+ const char* aCharset,
+ nsIURI* aBaseURI,
+ nsIURI** aResult) {
+ *aResult = nullptr;
+ nsresult rv;
+
+ // Use a simple URI to parse out some stuff first
+ nsCOMPtr<nsIURI> url;
+ rv = NS_MutateURI(new nsSimpleURI::Mutator()).SetSpec(aSpec).Finalize(url);
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (IsSafeToLinkForUntrustedContent(url)) {
+ // We need to indicate that this baby is safe. Use an inner URI that
+ // no one but the security manager will see. Make sure to preserve our
+ // path, in case someone decides to hardcode checks for particular
+ // about: URIs somewhere.
+ nsAutoCString spec;
+ rv = url->GetPathQueryRef(spec);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ spec.InsertLiteral("moz-safe-about:", 0);
+
+ nsCOMPtr<nsIURI> inner;
+ rv = NS_NewURI(getter_AddRefs(inner), spec);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = NS_MutateURI(new nsNestedAboutURI::Mutator())
+ .Apply(&nsINestedAboutURIMutator::InitWithBase, inner, aBaseURI)
+ .SetSpec(aSpec)
+ .Finalize(url);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ url.swap(*aResult);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAboutProtocolHandler::NewChannel(nsIURI* uri, nsILoadInfo* aLoadInfo,
+ nsIChannel** result) {
+ NS_ENSURE_ARG_POINTER(uri);
+
+ // about:what you ask?
+ nsCOMPtr<nsIAboutModule> aboutMod;
+ nsresult rv = NS_GetAboutModule(uri, getter_AddRefs(aboutMod));
+
+ nsAutoCString path;
+ nsresult rv2 = NS_GetAboutModuleName(uri, path);
+ if (NS_SUCCEEDED(rv2) && path.EqualsLiteral("srcdoc")) {
+ // about:srcdoc is meant to be unresolvable, yet is included in the
+ // about lookup tables so that it can pass security checks when used in
+ // a srcdoc iframe. To ensure that it stays unresolvable, we pretend
+ // that it doesn't exist.
+ rv = NS_ERROR_FACTORY_NOT_REGISTERED;
+ }
+
+ if (NS_SUCCEEDED(rv)) {
+ // The standard return case:
+ rv = aboutMod->NewChannel(uri, aLoadInfo, result);
+ if (NS_SUCCEEDED(rv)) {
+ // Not all implementations of nsIAboutModule::NewChannel()
+ // set the LoadInfo on the newly created channel yet, as
+ // an interim solution we set the LoadInfo here if not
+ // available on the channel. Bug 1087720
+ nsCOMPtr<nsILoadInfo> loadInfo = (*result)->LoadInfo();
+ if (aLoadInfo != loadInfo) {
+ NS_ASSERTION(false,
+ "nsIAboutModule->newChannel(aURI, aLoadInfo) needs to "
+ "set LoadInfo");
+ AutoTArray<nsString, 2> params = {
+ u"nsIAboutModule->newChannel(aURI)"_ns,
+ u"nsIAboutModule->newChannel(aURI, aLoadInfo)"_ns};
+ nsContentUtils::ReportToConsole(
+ nsIScriptError::warningFlag, "Security by Default"_ns,
+ nullptr, // aDocument
+ nsContentUtils::eNECKO_PROPERTIES, "APIDeprecationWarning", params);
+ (*result)->SetLoadInfo(aLoadInfo);
+ }
+
+ // If this URI is safe for untrusted content, enforce that its
+ // principal be based on the channel's originalURI by setting the
+ // owner to null.
+ // Note: this relies on aboutMod's newChannel implementation
+ // having set the proper originalURI, which probably isn't ideal.
+ if (IsSafeForUntrustedContent(aboutMod, uri)) {
+ (*result)->SetOwner(nullptr);
+ }
+
+ RefPtr<nsNestedAboutURI> aboutURI;
+ nsresult rv2 =
+ uri->QueryInterface(kNestedAboutURICID, getter_AddRefs(aboutURI));
+ if (NS_SUCCEEDED(rv2) && aboutURI->GetBaseURI()) {
+ nsCOMPtr<nsIWritablePropertyBag2> writableBag =
+ do_QueryInterface(*result);
+ if (writableBag) {
+ writableBag->SetPropertyAsInterface(u"baseURI"_ns,
+ aboutURI->GetBaseURI());
+ }
+ }
+ }
+ return rv;
+ }
+
+ // mumble...
+
+ if (rv == NS_ERROR_FACTORY_NOT_REGISTERED) {
+ // This looks like an about: we don't know about. Convert
+ // this to an invalid URI error.
+ rv = NS_ERROR_MALFORMED_URI;
+ }
+
+ return rv;
+}
+
+NS_IMETHODIMP
+nsAboutProtocolHandler::AllowPort(int32_t port, const char* scheme,
+ bool* _retval) {
+ // don't override anything.
+ *_retval = false;
+ return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Safe about protocol handler impl
+
+NS_IMPL_ISUPPORTS(nsSafeAboutProtocolHandler, nsIProtocolHandler,
+ nsISupportsWeakReference)
+
+// nsIProtocolHandler methods:
+
+NS_IMETHODIMP
+nsSafeAboutProtocolHandler::GetScheme(nsACString& result) {
+ result.AssignLiteral("moz-safe-about");
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSafeAboutProtocolHandler::NewChannel(nsIURI* uri, nsILoadInfo* aLoadInfo,
+ nsIChannel** result) {
+ *result = nullptr;
+ return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsSafeAboutProtocolHandler::AllowPort(int32_t port, const char* scheme,
+ bool* _retval) {
+ // don't override anything.
+ *_retval = false;
+ return NS_OK;
+}
+
+////////////////////////////////////////////////////////////
+// nsNestedAboutURI implementation
+
+NS_IMPL_CLASSINFO(nsNestedAboutURI, nullptr, nsIClassInfo::THREADSAFE,
+ NS_NESTEDABOUTURI_CID);
+// Empty CI getter. We only need nsIClassInfo for Serialization
+NS_IMPL_CI_INTERFACE_GETTER0(nsNestedAboutURI)
+
+NS_INTERFACE_MAP_BEGIN(nsNestedAboutURI)
+ if (aIID.Equals(kNestedAboutURICID)) {
+ foundInterface = static_cast<nsIURI*>(this);
+ } else
+ NS_IMPL_QUERY_CLASSINFO(nsNestedAboutURI)
+NS_INTERFACE_MAP_END_INHERITING(nsSimpleNestedURI)
+
+// nsISerializable
+
+NS_IMETHODIMP
+nsNestedAboutURI::Read(nsIObjectInputStream* aStream) {
+ MOZ_ASSERT_UNREACHABLE("Use nsIURIMutator.read() instead");
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+nsresult nsNestedAboutURI::ReadPrivate(nsIObjectInputStream* aStream) {
+ nsresult rv = nsSimpleNestedURI::ReadPrivate(aStream);
+ if (NS_FAILED(rv)) return rv;
+
+ bool haveBase;
+ rv = aStream->ReadBoolean(&haveBase);
+ if (NS_FAILED(rv)) return rv;
+
+ if (haveBase) {
+ nsCOMPtr<nsISupports> supports;
+ rv = aStream->ReadObject(true, getter_AddRefs(supports));
+ if (NS_FAILED(rv)) return rv;
+
+ mBaseURI = do_QueryInterface(supports, &rv);
+ if (NS_FAILED(rv)) return rv;
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNestedAboutURI::Write(nsIObjectOutputStream* aStream) {
+ nsresult rv = nsSimpleNestedURI::Write(aStream);
+ if (NS_FAILED(rv)) return rv;
+
+ rv = aStream->WriteBoolean(mBaseURI != nullptr);
+ if (NS_FAILED(rv)) return rv;
+
+ if (mBaseURI) {
+ // A previous iteration of this code wrote out mBaseURI as nsISupports
+ // and then read it in as nsIURI, which is non-kosher when mBaseURI
+ // implements more than just a single line of interfaces and the
+ // canonical nsISupports* isn't the one a static_cast<> of mBaseURI
+ // would produce. For backwards compatibility with existing
+ // serializations we continue to write mBaseURI as nsISupports but
+ // switch to reading it as nsISupports, with a post-read QI to get to
+ // nsIURI.
+ rv = aStream->WriteCompoundObject(mBaseURI, NS_GET_IID(nsISupports), true);
+ if (NS_FAILED(rv)) return rv;
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP_(void)
+nsNestedAboutURI::Serialize(mozilla::ipc::URIParams& aParams) {
+ using namespace mozilla::ipc;
+
+ NestedAboutURIParams params;
+ URIParams nestedParams;
+
+ nsSimpleNestedURI::Serialize(nestedParams);
+ params.nestedParams() = nestedParams;
+
+ if (mBaseURI) {
+ SerializeURI(mBaseURI, params.baseURI());
+ }
+
+ aParams = params;
+}
+
+bool nsNestedAboutURI::Deserialize(const mozilla::ipc::URIParams& aParams) {
+ using namespace mozilla::ipc;
+
+ if (aParams.type() != URIParams::TNestedAboutURIParams) {
+ NS_ERROR("Received unknown parameters from the other process!");
+ return false;
+ }
+
+ const NestedAboutURIParams& params = aParams.get_NestedAboutURIParams();
+ if (!nsSimpleNestedURI::Deserialize(params.nestedParams())) {
+ return false;
+ }
+
+ mBaseURI = nullptr;
+ if (params.baseURI()) {
+ mBaseURI = DeserializeURI(*params.baseURI());
+ }
+ return true;
+}
+
+// nsSimpleURI
+/* virtual */ nsSimpleURI* nsNestedAboutURI::StartClone(
+ nsSimpleURI::RefHandlingEnum aRefHandlingMode, const nsACString& aNewRef) {
+ // Sadly, we can't make use of nsSimpleNestedURI::StartClone here.
+ // However, this function is expected to exactly match that function,
+ // aside from the "new ns***URI()" call.
+ NS_ENSURE_TRUE(mInnerURI, nullptr);
+
+ nsCOMPtr<nsIURI> innerClone;
+ nsresult rv = NS_OK;
+ if (aRefHandlingMode == eHonorRef) {
+ innerClone = mInnerURI;
+ } else if (aRefHandlingMode == eReplaceRef) {
+ rv = NS_GetURIWithNewRef(mInnerURI, aNewRef, getter_AddRefs(innerClone));
+ } else {
+ rv = NS_GetURIWithoutRef(mInnerURI, getter_AddRefs(innerClone));
+ }
+
+ if (NS_FAILED(rv)) {
+ return nullptr;
+ }
+
+ nsNestedAboutURI* url = new nsNestedAboutURI(innerClone, mBaseURI);
+ SetRefOnClone(url, aRefHandlingMode, aNewRef);
+
+ return url;
+}
+
+// Queries this list of interfaces. If none match, it queries mURI.
+NS_IMPL_NSIURIMUTATOR_ISUPPORTS(nsNestedAboutURI::Mutator, nsIURISetters,
+ nsIURIMutator, nsISerializable,
+ nsINestedAboutURIMutator)
+
+NS_IMETHODIMP
+nsNestedAboutURI::Mutate(nsIURIMutator** aMutator) {
+ RefPtr<nsNestedAboutURI::Mutator> mutator = new nsNestedAboutURI::Mutator();
+ nsresult rv = mutator->InitFromURI(this);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ mutator.forget(aMutator);
+ return NS_OK;
+}
+
+} // namespace net
+} // namespace mozilla