forked from mirrors/gecko-dev
fa06a45b28
Before this change, the trusted URI schemes, based on a string whitelist, were: https, file, resource, app, moz-extension and wss. This change removes "app" from the list (since we don't implement it), and adds "about" to the list (because we control the delivery of that).
475 lines
15 KiB
C++
475 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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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#include "base/basictypes.h"
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#include "mozilla/ArrayUtils.h"
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#include "nsAboutProtocolHandler.h"
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#include "nsIURI.h"
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#include "nsIAboutModule.h"
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#include "nsString.h"
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#include "nsNetCID.h"
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#include "nsAboutProtocolUtils.h"
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#include "nsError.h"
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#include "nsNetUtil.h"
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#include "nsIObjectInputStream.h"
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#include "nsIObjectOutputStream.h"
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#include "nsAutoPtr.h"
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#include "nsIWritablePropertyBag2.h"
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#include "nsIChannel.h"
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#include "nsIScriptError.h"
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#include "nsIEnterprisePolicies.h"
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namespace mozilla {
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namespace net {
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static NS_DEFINE_CID(kSimpleURICID, NS_SIMPLEURI_CID);
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static NS_DEFINE_CID(kNestedAboutURICID, NS_NESTEDABOUTURI_CID);
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static bool IsSafeForUntrustedContent(nsIAboutModule *aModule, nsIURI *aURI) {
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uint32_t flags;
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nsresult rv = aModule->GetURIFlags(aURI, &flags);
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NS_ENSURE_SUCCESS(rv, false);
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return (flags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) != 0;
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}
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static bool IsSafeToLinkForUntrustedContent(nsIAboutModule *aModule, nsIURI *aURI) {
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uint32_t flags;
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nsresult rv = aModule->GetURIFlags(aURI, &flags);
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NS_ENSURE_SUCCESS(rv, false);
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return (flags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) && (flags & nsIAboutModule::MAKE_LINKABLE);
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}
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////////////////////////////////////////////////////////////////////////////////
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NS_IMPL_ISUPPORTS(nsAboutProtocolHandler, nsIProtocolHandler,
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nsIProtocolHandlerWithDynamicFlags, nsISupportsWeakReference)
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////////////////////////////////////////////////////////////////////////////////
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// nsIProtocolHandler methods:
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NS_IMETHODIMP
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nsAboutProtocolHandler::GetScheme(nsACString &result)
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{
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result.AssignLiteral("about");
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::GetDefaultPort(int32_t *result)
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{
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*result = -1; // no port for about: URLs
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::GetProtocolFlags(uint32_t *result)
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{
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*result = URI_NORELATIVE | URI_NOAUTH | URI_DANGEROUS_TO_LOAD | URI_SCHEME_NOT_SELF_LINKABLE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::GetFlagsForURI(nsIURI* aURI, uint32_t* aFlags)
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{
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// First use the default (which is "unsafe for content"):
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GetProtocolFlags(aFlags);
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// Now try to see if this URI overrides the default:
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nsCOMPtr<nsIAboutModule> aboutMod;
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nsresult rv = NS_GetAboutModule(aURI, getter_AddRefs(aboutMod));
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if (NS_FAILED(rv)) {
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// Swallow this and just tell the consumer the default:
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return NS_OK;
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}
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uint32_t aboutModuleFlags = 0;
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rv = aboutMod->GetURIFlags(aURI, &aboutModuleFlags);
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// This should never happen, so pass back the error:
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NS_ENSURE_SUCCESS(rv, rv);
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// Secure (https) pages can load safe about pages without becoming
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// mixed content.
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if (aboutModuleFlags & nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT) {
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*aFlags |= URI_IS_POTENTIALLY_TRUSTWORTHY;
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// about: pages can only be loaded by unprivileged principals
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// if they are marked as LINKABLE
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if (aboutModuleFlags & nsIAboutModule::MAKE_LINKABLE) {
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// Replace URI_DANGEROUS_TO_LOAD with URI_LOADABLE_BY_ANYONE.
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*aFlags &= ~URI_DANGEROUS_TO_LOAD;
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*aFlags |= URI_LOADABLE_BY_ANYONE;
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::NewURI(const nsACString &aSpec,
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const char *aCharset, // ignore charset info
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nsIURI *aBaseURI,
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nsIURI **result)
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{
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*result = nullptr;
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nsresult rv;
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// Use a simple URI to parse out some stuff first
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nsCOMPtr<nsIURI> url;
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rv = NS_MutateURI(new nsSimpleURI::Mutator())
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.SetSpec(aSpec)
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.Finalize(url);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// Unfortunately, people create random about: URIs that don't correspond to
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// about: modules... Since those URIs will never open a channel, might as
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// well consider them unsafe for better perf, and just in case.
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bool isSafe = false;
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nsCOMPtr<nsIAboutModule> aboutMod;
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rv = NS_GetAboutModule(url, getter_AddRefs(aboutMod));
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if (NS_SUCCEEDED(rv)) {
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isSafe = IsSafeToLinkForUntrustedContent(aboutMod, url);
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}
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if (isSafe) {
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// We need to indicate that this baby is safe. Use an inner URI that
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// no one but the security manager will see. Make sure to preserve our
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// path, in case someone decides to hardcode checks for particular
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// about: URIs somewhere.
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nsAutoCString spec;
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rv = url->GetPathQueryRef(spec);
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NS_ENSURE_SUCCESS(rv, rv);
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spec.InsertLiteral("moz-safe-about:", 0);
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nsCOMPtr<nsIURI> inner;
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rv = NS_NewURI(getter_AddRefs(inner), spec);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIURI> base(aBaseURI);
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rv = NS_MutateURI(new nsNestedAboutURI::Mutator())
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.Apply(NS_MutatorMethod(&nsINestedAboutURIMutator::InitWithBase,
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inner, base))
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.SetSpec(aSpec)
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.Finalize(url);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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url.swap(*result);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::NewChannel2(nsIURI* uri,
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nsILoadInfo* aLoadInfo,
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nsIChannel** result)
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{
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NS_ENSURE_ARG_POINTER(uri);
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// about:what you ask?
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nsCOMPtr<nsIAboutModule> aboutMod;
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nsresult rv = NS_GetAboutModule(uri, getter_AddRefs(aboutMod));
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bool aboutPageAllowed = true;
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nsAutoCString path;
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nsresult rv2 = NS_GetAboutModuleName(uri, path);
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if (NS_SUCCEEDED(rv2)) {
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if (path.EqualsLiteral("srcdoc")) {
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// about:srcdoc is meant to be unresolvable, yet is included in the
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// about lookup tables so that it can pass security checks when used in
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// a srcdoc iframe. To ensure that it stays unresolvable, we pretend
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// that it doesn't exist.
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rv = NS_ERROR_FACTORY_NOT_REGISTERED;
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} else {
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nsCOMPtr<nsIEnterprisePolicies> policyManager =
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do_GetService("@mozilla.org/browser/enterprisepolicies;1", &rv2);
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if (NS_SUCCEEDED(rv2)) {
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nsAutoCString normalizedURL;
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normalizedURL.AssignLiteral("about:");
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normalizedURL.Append(path);
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rv2 = policyManager->IsAllowed(normalizedURL, &aboutPageAllowed);
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if (NS_FAILED(rv2)) {
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aboutPageAllowed = false;
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}
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}
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}
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}
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if (NS_SUCCEEDED(rv)) {
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// The standard return case:
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rv = aboutMod->NewChannel(uri, aLoadInfo, result);
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if (NS_SUCCEEDED(rv)) {
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// Not all implementations of nsIAboutModule::NewChannel()
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// set the LoadInfo on the newly created channel yet, as
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// an interim solution we set the LoadInfo here if not
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// available on the channel. Bug 1087720
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nsCOMPtr<nsILoadInfo> loadInfo = (*result)->GetLoadInfo();
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if (aLoadInfo != loadInfo) {
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if (loadInfo) {
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NS_ASSERTION(false,
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"nsIAboutModule->newChannel(aURI, aLoadInfo) needs to set LoadInfo");
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const char16_t* params[] = {
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u"nsIAboutModule->newChannel(aURI)",
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u"nsIAboutModule->newChannel(aURI, aLoadInfo)"
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};
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nsContentUtils::ReportToConsole(
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nsIScriptError::warningFlag,
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NS_LITERAL_CSTRING("Security by Default"),
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nullptr, // aDocument
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nsContentUtils::eNECKO_PROPERTIES,
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"APIDeprecationWarning",
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params, mozilla::ArrayLength(params));
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}
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(*result)->SetLoadInfo(aLoadInfo);
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}
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// If this URI is safe for untrusted content, enforce that its
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// principal be based on the channel's originalURI by setting the
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// owner to null.
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// Note: this relies on aboutMod's newChannel implementation
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// having set the proper originalURI, which probably isn't ideal.
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if (IsSafeForUntrustedContent(aboutMod, uri)) {
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(*result)->SetOwner(nullptr);
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}
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RefPtr<nsNestedAboutURI> aboutURI;
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nsresult rv2 = uri->QueryInterface(kNestedAboutURICID,
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getter_AddRefs(aboutURI));
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if (NS_SUCCEEDED(rv2) && aboutURI->GetBaseURI()) {
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nsCOMPtr<nsIWritablePropertyBag2> writableBag =
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do_QueryInterface(*result);
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if (writableBag) {
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writableBag->
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SetPropertyAsInterface(NS_LITERAL_STRING("baseURI"),
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aboutURI->GetBaseURI());
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}
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}
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if (!aboutPageAllowed) {
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(*result)->Cancel(NS_ERROR_BLOCKED_BY_POLICY);
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}
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}
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return rv;
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}
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// mumble...
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if (rv == NS_ERROR_FACTORY_NOT_REGISTERED) {
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// This looks like an about: we don't know about. Convert
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// this to an invalid URI error.
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rv = NS_ERROR_MALFORMED_URI;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
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{
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return NewChannel2(uri, nullptr, result);
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}
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NS_IMETHODIMP
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nsAboutProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
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{
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// don't override anything.
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*_retval = false;
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Safe about protocol handler impl
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NS_IMPL_ISUPPORTS(nsSafeAboutProtocolHandler, nsIProtocolHandler, nsISupportsWeakReference)
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// nsIProtocolHandler methods:
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::GetScheme(nsACString &result)
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{
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result.AssignLiteral("moz-safe-about");
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::GetDefaultPort(int32_t *result)
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{
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*result = -1; // no port for moz-safe-about: URLs
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::GetProtocolFlags(uint32_t *result)
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{
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*result = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_ANYONE | URI_IS_POTENTIALLY_TRUSTWORTHY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::NewURI(const nsACString &aSpec,
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const char *aCharset, // ignore charset info
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nsIURI *aBaseURI,
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nsIURI **result)
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{
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nsresult rv = NS_MutateURI(new nsSimpleURI::Mutator())
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.SetSpec(aSpec)
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.Finalize(result);
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if (NS_FAILED(rv)) {
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return rv;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::NewChannel2(nsIURI* uri,
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nsILoadInfo* aLoadInfo,
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nsIChannel** result)
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{
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*result = nullptr;
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return NS_ERROR_NOT_AVAILABLE;
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}
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
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{
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*result = nullptr;
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return NS_ERROR_NOT_AVAILABLE;
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}
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NS_IMETHODIMP
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nsSafeAboutProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
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{
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// don't override anything.
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*_retval = false;
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return NS_OK;
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}
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////////////////////////////////////////////////////////////
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// nsNestedAboutURI implementation
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NS_INTERFACE_MAP_BEGIN(nsNestedAboutURI)
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if (aIID.Equals(kNestedAboutURICID))
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foundInterface = static_cast<nsIURI*>(this);
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else
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NS_INTERFACE_MAP_END_INHERITING(nsSimpleNestedURI)
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// nsISerializable
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NS_IMETHODIMP
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nsNestedAboutURI::Read(nsIObjectInputStream *aStream)
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{
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NS_NOTREACHED("Use nsIURIMutator.read() instead");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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nsresult
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nsNestedAboutURI::ReadPrivate(nsIObjectInputStream *aStream)
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{
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nsresult rv = nsSimpleNestedURI::ReadPrivate(aStream);
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if (NS_FAILED(rv)) return rv;
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bool haveBase;
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rv = aStream->ReadBoolean(&haveBase);
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if (NS_FAILED(rv)) return rv;
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if (haveBase) {
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nsCOMPtr<nsISupports> supports;
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rv = aStream->ReadObject(true, getter_AddRefs(supports));
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if (NS_FAILED(rv)) return rv;
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mBaseURI = do_QueryInterface(supports, &rv);
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if (NS_FAILED(rv)) return rv;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsNestedAboutURI::Write(nsIObjectOutputStream* aStream)
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{
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nsresult rv = nsSimpleNestedURI::Write(aStream);
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if (NS_FAILED(rv)) return rv;
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rv = aStream->WriteBoolean(mBaseURI != nullptr);
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if (NS_FAILED(rv)) return rv;
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if (mBaseURI) {
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// A previous iteration of this code wrote out mBaseURI as nsISupports
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// and then read it in as nsIURI, which is non-kosher when mBaseURI
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// implements more than just a single line of interfaces and the
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// canonical nsISupports* isn't the one a static_cast<> of mBaseURI
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// would produce. For backwards compatibility with existing
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// serializations we continue to write mBaseURI as nsISupports but
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// switch to reading it as nsISupports, with a post-read QI to get to
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// nsIURI.
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rv = aStream->WriteCompoundObject(mBaseURI, NS_GET_IID(nsISupports),
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true);
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if (NS_FAILED(rv)) return rv;
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}
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return NS_OK;
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}
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// nsSimpleURI
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/* virtual */ nsSimpleURI*
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nsNestedAboutURI::StartClone(nsSimpleURI::RefHandlingEnum aRefHandlingMode,
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const nsACString& aNewRef)
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{
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// Sadly, we can't make use of nsSimpleNestedURI::StartClone here.
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// However, this function is expected to exactly match that function,
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// aside from the "new ns***URI()" call.
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NS_ENSURE_TRUE(mInnerURI, nullptr);
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nsCOMPtr<nsIURI> innerClone;
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nsresult rv;
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if (aRefHandlingMode == eHonorRef) {
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rv = mInnerURI->Clone(getter_AddRefs(innerClone));
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} else if (aRefHandlingMode == eReplaceRef) {
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rv = mInnerURI->CloneWithNewRef(aNewRef, getter_AddRefs(innerClone));
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} else {
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rv = mInnerURI->CloneIgnoringRef(getter_AddRefs(innerClone));
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}
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if (NS_FAILED(rv)) {
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return nullptr;
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}
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nsNestedAboutURI* url = new nsNestedAboutURI(innerClone, mBaseURI);
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SetRefOnClone(url, aRefHandlingMode, aNewRef);
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return url;
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}
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// Queries this list of interfaces. If none match, it queries mURI.
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NS_IMPL_NSIURIMUTATOR_ISUPPORTS(nsNestedAboutURI::Mutator,
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nsIURISetters,
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nsIURIMutator,
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nsISerializable,
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nsINestedAboutURIMutator)
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NS_IMETHODIMP
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nsNestedAboutURI::Mutate(nsIURIMutator** aMutator)
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{
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RefPtr<nsNestedAboutURI::Mutator> mutator = new nsNestedAboutURI::Mutator();
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nsresult rv = mutator->InitFromURI(this);
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if (NS_FAILED(rv)) {
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return rv;
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}
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mutator.forget(aMutator);
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return NS_OK;
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}
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// nsIClassInfo
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NS_IMETHODIMP
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nsNestedAboutURI::GetClassIDNoAlloc(nsCID *aClassIDNoAlloc)
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{
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*aClassIDNoAlloc = kNestedAboutURICID;
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return NS_OK;
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}
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} // namespace net
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} // namespace mozilla
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