gecko-dev/caps/ContentPrincipal.cpp

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Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=80: */
2012-05-21 15:12:37 +04:00
/* 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 "ContentPrincipal.h"
#include "mozIThirdPartyUtil.h"
#include "nsContentUtils.h"
#include "nscore.h"
#include "nsScriptSecurityManager.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "pratom.h"
#include "nsIURI.h"
#include "nsIURL.h"
#include "nsIStandardURL.h"
#include "nsIURIWithSpecialOrigin.h"
#include "nsIURIMutator.h"
#include "nsJSPrincipals.h"
#include "nsIEffectiveTLDService.h"
#include "nsIClassInfoImpl.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsIProtocolHandler.h"
#include "nsError.h"
#include "nsIContentSecurityPolicy.h"
#include "nsNetCID.h"
#include "js/Wrapper.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/nsCSPContext.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ExtensionPolicyService.h"
#include "mozilla/Preferences.h"
#include "mozilla/HashFunctions.h"
using namespace mozilla;
static inline ExtensionPolicyService&
EPS()
{
return ExtensionPolicyService::GetSingleton();
}
NS_IMPL_CLASSINFO(ContentPrincipal, nullptr, nsIClassInfo::MAIN_THREAD_ONLY,
NS_PRINCIPAL_CID)
NS_IMPL_QUERY_INTERFACE_CI(ContentPrincipal,
nsIPrincipal,
nsISerializable)
NS_IMPL_CI_INTERFACE_GETTER(ContentPrincipal,
nsIPrincipal,
nsISerializable)
ContentPrincipal::ContentPrincipal()
: BasePrincipal(eCodebasePrincipal)
{
}
ContentPrincipal::~ContentPrincipal()
{
// let's clear the principal within the csp to avoid a tangling pointer
if (mCSP) {
static_cast<nsCSPContext*>(mCSP.get())->clearLoadingPrincipal();
}
}
nsresult
ContentPrincipal::Init(nsIURI *aCodebase,
const OriginAttributes& aOriginAttributes,
const nsACString& aOriginNoSuffix)
{
NS_ENSURE_ARG(aCodebase);
// Assert that the URI we get here isn't any of the schemes that we know we
// should not get here. These schemes always either inherit their principal
// or fall back to a null principal. These are schemes which return
// URI_INHERITS_SECURITY_CONTEXT from their protocol handler's
// GetProtocolFlags function.
bool hasFlag;
Unused << hasFlag; // silence possible compiler warnings.
MOZ_DIAGNOSTIC_ASSERT(
NS_SUCCEEDED(NS_URIChainHasFlags(aCodebase,
nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT,
&hasFlag)) &&
!hasFlag);
mCodebase = aCodebase;
FinishInit(aOriginNoSuffix, aOriginAttributes);
return NS_OK;
}
nsresult
ContentPrincipal::GetScriptLocation(nsACString &aStr)
{
return mCodebase->GetSpec(aStr);
}
/* static */ nsresult
ContentPrincipal::GenerateOriginNoSuffixFromURI(nsIURI* aURI,
nsACString& aOriginNoSuffix)
{
if (!aURI) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIURI> origin = NS_GetInnermostURI(aURI);
if (!origin) {
return NS_ERROR_FAILURE;
}
MOZ_ASSERT(!NS_IsAboutBlank(origin),
"The inner URI for about:blank must be moz-safe-about:blank");
// Handle non-strict file:// uris.
if (!nsScriptSecurityManager::GetStrictFileOriginPolicy() &&
NS_URIIsLocalFile(origin)) {
// If strict file origin policy is not in effect, all local files are
// considered to be same-origin, so return a known dummy origin here.
aOriginNoSuffix.AssignLiteral("file://UNIVERSAL_FILE_URI_ORIGIN");
return NS_OK;
}
nsresult rv;
// NB: This is only compiled for Thunderbird/Suite.
#if IS_ORIGIN_IS_FULL_SPEC_DEFINED
bool fullSpec = false;
rv = NS_URIChainHasFlags(origin, nsIProtocolHandler::ORIGIN_IS_FULL_SPEC, &fullSpec);
NS_ENSURE_SUCCESS(rv, rv);
if (fullSpec) {
return origin->GetAsciiSpec(aOriginNoSuffix);
}
#endif
// We want the invariant that prinA.origin == prinB.origin i.f.f.
// prinA.equals(prinB). However, this requires that we impose certain constraints
// on the behavior and origin semantics of principals, and in particular, forbid
// creating origin strings for principals whose equality constraints are not
// expressible as strings (i.e. object equality). Moreover, we want to forbid URIs
// containing the magic "^" we use as a separating character for origin
// attributes.
//
// These constraints can generally be achieved by restricting .origin to
// nsIStandardURL-based URIs, but there are a few other URI schemes that we need
// to handle.
bool isBehaved;
if ((NS_SUCCEEDED(origin->SchemeIs("about", &isBehaved)) && isBehaved) ||
(NS_SUCCEEDED(origin->SchemeIs("moz-safe-about", &isBehaved)) && isBehaved &&
// We generally consider two about:foo origins to be same-origin, but
// about:blank is special since it can be generated from different sources.
// We check for moz-safe-about:blank since origin is an innermost URI.
!origin->GetSpecOrDefault().EqualsLiteral("moz-safe-about:blank")) ||
(NS_SUCCEEDED(origin->SchemeIs("indexeddb", &isBehaved)) && isBehaved)) {
rv = origin->GetAsciiSpec(aOriginNoSuffix);
NS_ENSURE_SUCCESS(rv, rv);
int32_t pos = aOriginNoSuffix.FindChar('?');
int32_t hashPos = aOriginNoSuffix.FindChar('#');
if (hashPos != kNotFound && (pos == kNotFound || hashPos < pos)) {
pos = hashPos;
}
if (pos != kNotFound) {
aOriginNoSuffix.Truncate(pos);
}
// These URIs could technically contain a '^', but they never should.
if (NS_WARN_IF(aOriginNoSuffix.FindChar('^', 0) != -1)) {
aOriginNoSuffix.Truncate();
return NS_ERROR_FAILURE;
}
return NS_OK;
}
// This URL can be a blobURL. In this case, we should use the 'parent'
// principal instead.
nsCOMPtr<nsIPrincipal> blobPrincipal;
if (dom::BlobURLProtocolHandler::GetBlobURLPrincipal(origin,
getter_AddRefs(blobPrincipal))) {
MOZ_ASSERT(blobPrincipal);
return blobPrincipal->GetOriginNoSuffix(aOriginNoSuffix);
}
// If we reached this branch, we can only create an origin if we have a
// nsIStandardURL. So, we query to a nsIStandardURL, and fail if we aren't
// an instance of an nsIStandardURL nsIStandardURLs have the good property
// of escaping the '^' character in their specs, which means that we can be
// sure that the caret character (which is reserved for delimiting the end
// of the spec, and the beginning of the origin attributes) is not present
// in the origin string
nsCOMPtr<nsIStandardURL> standardURL = do_QueryInterface(origin);
if (!standardURL) {
return NS_ERROR_FAILURE;
}
// See whether we have a useful hostPort. If we do, use that.
nsAutoCString hostPort;
bool isChrome = false;
rv = origin->SchemeIs("chrome", &isChrome);
NS_ENSURE_SUCCESS(rv, rv);
if (!isChrome) {
rv = origin->GetAsciiHostPort(hostPort);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!hostPort.IsEmpty()) {
rv = origin->GetScheme(aOriginNoSuffix);
NS_ENSURE_SUCCESS(rv, rv);
aOriginNoSuffix.AppendLiteral("://");
aOriginNoSuffix.Append(hostPort);
return NS_OK;
}
rv = aURI->GetAsciiSpec(aOriginNoSuffix);
NS_ENSURE_SUCCESS(rv, rv);
// The origin, when taken from the spec, should not contain the ref part of
// the URL.
int32_t pos = aOriginNoSuffix.FindChar('?');
int32_t hashPos = aOriginNoSuffix.FindChar('#');
if (hashPos != kNotFound && (pos == kNotFound || hashPos < pos)) {
pos = hashPos;
}
if (pos != kNotFound) {
aOriginNoSuffix.Truncate(pos);
}
return NS_OK;
}
bool
ContentPrincipal::SubsumesInternal(nsIPrincipal* aOther,
BasePrincipal::DocumentDomainConsideration aConsideration)
{
MOZ_ASSERT(aOther);
// For ContentPrincipal, Subsumes is equivalent to Equals.
if (aOther == this) {
return true;
}
// If either the subject or the object has changed its principal by
// explicitly setting document.domain then the other must also have
// done so in order to be considered the same origin. This prevents
// DNS spoofing based on document.domain (154930)
nsresult rv;
if (aConsideration == ConsiderDocumentDomain) {
// Get .domain on each principal.
nsCOMPtr<nsIURI> thisDomain, otherDomain;
GetDomain(getter_AddRefs(thisDomain));
aOther->GetDomain(getter_AddRefs(otherDomain));
// If either has .domain set, we have equality i.f.f. the domains match.
// Otherwise, we fall through to the non-document-domain-considering case.
if (thisDomain || otherDomain) {
bool isMatch =
nsScriptSecurityManager::SecurityCompareURIs(thisDomain, otherDomain);
#ifdef DEBUG
if (isMatch) {
nsAutoCString thisSiteOrigin, otherSiteOrigin;
MOZ_ALWAYS_SUCCEEDS(GetSiteOrigin(thisSiteOrigin));
MOZ_ALWAYS_SUCCEEDS(aOther->GetSiteOrigin(otherSiteOrigin));
MOZ_ASSERT(thisSiteOrigin == otherSiteOrigin,
"SubsumesConsideringDomain passed with mismatched siteOrigin!");
}
#endif
return isMatch;
}
}
nsCOMPtr<nsIURI> otherURI;
rv = aOther->GetURI(getter_AddRefs(otherURI));
NS_ENSURE_SUCCESS(rv, false);
// Compare codebases.
return nsScriptSecurityManager::SecurityCompareURIs(mCodebase, otherURI);
}
NS_IMETHODIMP
ContentPrincipal::GetURI(nsIURI** aURI)
{
NS_ADDREF(*aURI = mCodebase);
return NS_OK;
}
bool
ContentPrincipal::MayLoadInternal(nsIURI* aURI)
{
MOZ_ASSERT(aURI);
#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
nsCOMPtr<nsIURIWithSpecialOrigin> uriWithSpecialOrigin = do_QueryInterface(aURI);
if (uriWithSpecialOrigin) {
nsCOMPtr<nsIURI> origin;
nsresult rv = uriWithSpecialOrigin->GetOrigin(getter_AddRefs(origin));
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
MOZ_ASSERT(origin);
OriginAttributes attrs;
RefPtr<BasePrincipal> principal = BasePrincipal::CreateCodebasePrincipal(origin, attrs);
return nsIPrincipal::Subsumes(principal);
}
#endif
nsCOMPtr<nsIPrincipal> blobPrincipal;
if (dom::BlobURLProtocolHandler::GetBlobURLPrincipal(aURI,
getter_AddRefs(blobPrincipal))) {
MOZ_ASSERT(blobPrincipal);
return nsIPrincipal::Subsumes(blobPrincipal);
}
// If this principal is associated with an addon, check whether that addon
// has been given permission to load from this domain.
if (AddonAllowsLoad(aURI)) {
return true;
}
if (nsScriptSecurityManager::SecurityCompareURIs(mCodebase, aURI)) {
return true;
}
// If strict file origin policy is in effect, local files will always fail
// SecurityCompareURIs unless they are identical. Explicitly check file origin
// policy, in that case.
if (nsScriptSecurityManager::GetStrictFileOriginPolicy() &&
NS_URIIsLocalFile(aURI) &&
NS_RelaxStrictFileOriginPolicy(aURI, mCodebase)) {
return true;
}
return false;
}
NS_IMETHODIMP
ContentPrincipal::GetHashValue(uint32_t* aValue)
{
MOZ_ASSERT(mCodebase, "Need a codebase");
*aValue = nsScriptSecurityManager::HashPrincipalByOrigin(this);
return NS_OK;
}
NS_IMETHODIMP
ContentPrincipal::GetDomain(nsIURI** aDomain)
{
if (!mDomain) {
*aDomain = nullptr;
return NS_OK;
}
NS_ADDREF(*aDomain = mDomain);
return NS_OK;
}
NS_IMETHODIMP
ContentPrincipal::SetDomain(nsIURI* aDomain)
{
MOZ_ASSERT(aDomain);
mDomain = aDomain;
SetHasExplicitDomain();
// Recompute all wrappers between compartments using this principal and other
// non-chrome compartments.
AutoSafeJSContext cx;
JSPrincipals *principals = nsJSPrincipals::get(static_cast<nsIPrincipal*>(this));
bool success = js::RecomputeWrappers(cx, js::ContentCompartmentsOnly(),
js::CompartmentsWithPrincipals(principals));
NS_ENSURE_TRUE(success, NS_ERROR_FAILURE);
success = js::RecomputeWrappers(cx, js::CompartmentsWithPrincipals(principals),
js::ContentCompartmentsOnly());
NS_ENSURE_TRUE(success, NS_ERROR_FAILURE);
// Set the changed-document-domain flag on compartments containing realms
// using this principal.
auto cb = [](JSContext*, void*, JS::Handle<JS::Realm*> aRealm) {
JS::Compartment* comp = JS::GetCompartmentForRealm(aRealm);
xpc::SetCompartmentChangedDocumentDomain(comp);
};
JS::IterateRealmsWithPrincipals(cx, principals, nullptr, cb);
return NS_OK;
}
static nsresult
GetSpecialBaseDomain(const nsCOMPtr<nsIURI>& aCodebase,
bool* aHandled,
nsACString& aBaseDomain)
{
*aHandled = false;
// For a file URI, we return the file path.
if (NS_URIIsLocalFile(aCodebase)) {
nsCOMPtr<nsIURL> url = do_QueryInterface(aCodebase);
if (url) {
*aHandled = true;
return url->GetFilePath(aBaseDomain);
}
}
bool hasNoRelativeFlag;
nsresult rv = NS_URIChainHasFlags(aCodebase,
nsIProtocolHandler::URI_NORELATIVE,
&hasNoRelativeFlag);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (hasNoRelativeFlag) {
*aHandled = true;
return aCodebase->GetSpec(aBaseDomain);
}
return NS_OK;
}
NS_IMETHODIMP
ContentPrincipal::GetBaseDomain(nsACString& aBaseDomain)
{
// Handle some special URIs first.
bool handled;
nsresult rv = GetSpecialBaseDomain(mCodebase, &handled, aBaseDomain);
NS_ENSURE_SUCCESS(rv, rv);
if (handled) {
return NS_OK;
}
// For everything else, we ask the TLD service via the ThirdPartyUtil.
nsCOMPtr<mozIThirdPartyUtil> thirdPartyUtil =
do_GetService(THIRDPARTYUTIL_CONTRACTID);
if (!thirdPartyUtil) {
return NS_ERROR_FAILURE;
}
return thirdPartyUtil->GetBaseDomain(mCodebase, aBaseDomain);
}
NS_IMETHODIMP
ContentPrincipal::GetSiteOrigin(nsACString& aSiteOrigin)
{
// Handle some special URIs first.
nsAutoCString baseDomain;
bool handled;
nsresult rv = GetSpecialBaseDomain(mCodebase, &handled, baseDomain);
NS_ENSURE_SUCCESS(rv, rv);
if (handled) {
// This is a special URI ("file:", "about:", "view-source:", etc). Just
// return the origin.
return GetOrigin(aSiteOrigin);
}
// For everything else, we ask the TLD service. Note that, unlike in
// GetBaseDomain, we don't use ThirdPartyUtil.getBaseDomain because if the
// host is an IP address that returns the raw address and we can't use it with
// SetHost below because SetHost expects '[' and ']' around IPv6 addresses.
// See bug 1491728.
nsCOMPtr<nsIEffectiveTLDService> tldService =
do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);
if (!tldService) {
return NS_ERROR_FAILURE;
}
bool gotBaseDomain = false;
rv = tldService->GetBaseDomain(mCodebase, 0, baseDomain);
if (NS_SUCCEEDED(rv)) {
gotBaseDomain = true;
} else {
// If this is an IP address or something like "localhost", we just continue
// with gotBaseDomain = false.
if (rv != NS_ERROR_HOST_IS_IP_ADDRESS &&
rv != NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
return rv;
}
}
// NOTE: Calling `SetHostPort` with a portless domain is insufficient to clear
// the port, so an extra `SetPort` call has to be made.
nsCOMPtr<nsIURI> siteUri;
NS_MutateURI mutator(mCodebase);
mutator.SetUserPass(EmptyCString())
.SetPort(-1);
if (gotBaseDomain) {
mutator.SetHost(baseDomain);
}
rv = mutator.Finalize(siteUri);
MOZ_ASSERT(NS_SUCCEEDED(rv), "failed to create siteUri");
NS_ENSURE_SUCCESS(rv, rv);
rv = GenerateOriginNoSuffixFromURI(siteUri, aSiteOrigin);
MOZ_ASSERT(NS_SUCCEEDED(rv), "failed to create siteOriginNoSuffix");
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString suffix;
rv = GetOriginSuffix(suffix);
MOZ_ASSERT(NS_SUCCEEDED(rv), "failed to create suffix");
NS_ENSURE_SUCCESS(rv, rv);
aSiteOrigin.Append(suffix);
return NS_OK;
}
nsresult
ContentPrincipal::GetSiteIdentifier(SiteIdentifier& aSite)
{
nsCString siteOrigin;
nsresult rv = GetSiteOrigin(siteOrigin);
NS_ENSURE_SUCCESS(rv, rv);
RefPtr<BasePrincipal> principal = CreateCodebasePrincipal(siteOrigin);
if (!principal) {
NS_WARNING("could not instantiate codebase principal");
return NS_ERROR_FAILURE;
}
aSite.Init(principal);
return NS_OK;
}
WebExtensionPolicy*
ContentPrincipal::AddonPolicy()
{
if (!mAddon.isSome()) {
NS_ENSURE_TRUE(mCodebase, nullptr);
bool isMozExt;
if (NS_SUCCEEDED(mCodebase->SchemeIs("moz-extension", &isMozExt)) && isMozExt) {
mAddon.emplace(EPS().GetByURL(mCodebase.get()));
} else {
mAddon.emplace(nullptr);
}
}
return mAddon.value();
}
NS_IMETHODIMP
ContentPrincipal::GetAddonId(nsAString& aAddonId)
{
auto policy = AddonPolicy();
if (policy) {
policy->GetId(aAddonId);
} else {
aAddonId.Truncate();
}
return NS_OK;
}
NS_IMETHODIMP
ContentPrincipal::Read(nsIObjectInputStream* aStream)
{
nsCOMPtr<nsISupports> supports;
nsCOMPtr<nsIURI> codebase;
nsresult rv = NS_ReadOptionalObject(aStream, true, getter_AddRefs(supports));
if (NS_FAILED(rv)) {
return rv;
}
codebase = do_QueryInterface(supports);
// Enforce re-parsing about: URIs so that if they change, we continue to use
// their new principals correctly.
bool isAbout = false;
if (NS_SUCCEEDED(codebase->SchemeIs("about", &isAbout)) && isAbout) {
nsAutoCString spec;
codebase->GetSpec(spec);
NS_ENSURE_SUCCESS(NS_NewURI(getter_AddRefs(codebase), spec), NS_ERROR_FAILURE);
}
nsCOMPtr<nsIURI> domain;
rv = NS_ReadOptionalObject(aStream, true, getter_AddRefs(supports));
if (NS_FAILED(rv)) {
return rv;
}
domain = do_QueryInterface(supports);
nsAutoCString suffix;
rv = aStream->ReadCString(suffix);
NS_ENSURE_SUCCESS(rv, rv);
OriginAttributes attrs;
bool ok = attrs.PopulateFromSuffix(suffix);
NS_ENSURE_TRUE(ok, NS_ERROR_FAILURE);
rv = NS_ReadOptionalObject(aStream, true, getter_AddRefs(supports));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString originNoSuffix;
rv = GenerateOriginNoSuffixFromURI(codebase, originNoSuffix);
NS_ENSURE_SUCCESS(rv, rv);
rv = Init(codebase, attrs, originNoSuffix);
NS_ENSURE_SUCCESS(rv, rv);
mCSP = do_QueryInterface(supports, &rv);
// make sure setRequestContext is called after Init(),
// to make sure the principals URI been initalized.
if (mCSP) {
mCSP->SetRequestContext(nullptr, this);
}
// Note: we don't call SetDomain here because we don't need the wrapper
// recomputation code there (we just created this principal).
mDomain = domain;
if (mDomain) {
SetHasExplicitDomain();
}
return NS_OK;
}
NS_IMETHODIMP
ContentPrincipal::Write(nsIObjectOutputStream* aStream)
{
NS_ENSURE_STATE(mCodebase);
nsresult rv = NS_WriteOptionalCompoundObject(aStream, mCodebase, NS_GET_IID(nsIURI),
true);
if (NS_FAILED(rv)) {
return rv;
}
rv = NS_WriteOptionalCompoundObject(aStream, mDomain, NS_GET_IID(nsIURI),
true);
if (NS_FAILED(rv)) {
return rv;
}
nsAutoCString suffix;
OriginAttributesRef().CreateSuffix(suffix);
rv = aStream->WriteStringZ(suffix.get());
NS_ENSURE_SUCCESS(rv, rv);
rv = NS_WriteOptionalCompoundObject(aStream, mCSP,
NS_GET_IID(nsIContentSecurityPolicy),
true);
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}