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nsScriptSecurityManager.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=4 et sw=4 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 "nsScriptSecurityManager.h"
#include "mozilla/ArrayUtils.h"
#include "xpcprivate.h"
#include "XPCWrapper.h"
#include "nsIAppsService.h"
#include "nsILoadContext.h"
#include "nsIServiceManager.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScriptContext.h"
#include "nsIURL.h"
#include "nsINestedURI.h"
#include "nspr.h"
#include "nsJSPrincipals.h"
#include "mozilla/BasePrincipal.h"
#include "nsSystemPrincipal.h"
#include "nsPrincipal.h"
#include "nsNullPrincipal.h"
#include "DomainPolicy.h"
#include "nsXPIDLString.h"
#include "nsCRT.h"
#include "nsCRTGlue.h"
#include "nsError.h"
#include "nsDOMCID.h"
#include "nsIXPConnect.h"
#include "nsTextFormatter.h"
#include "nsIStringBundle.h"
#include "nsNetUtil.h"
#include "nsIEffectiveTLDService.h"
#include "nsIProperties.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIFile.h"
#include "nsIFileURL.h"
#include "nsIZipReader.h"
#include "nsIXPConnect.h"
#include "nsIScriptGlobalObject.h"
#include "nsPIDOMWindow.h"
#include "nsIDocShell.h"
#include "nsIPrompt.h"
#include "nsIWindowWatcher.h"
#include "nsIConsoleService.h"
#include "nsIJSRuntimeService.h"
#include "nsIObserverService.h"
#include "nsIContent.h"
#include "nsAutoPtr.h"
#include "nsDOMJSUtils.h"
#include "nsAboutProtocolUtils.h"
#include "nsIClassInfo.h"
#include "nsIURIFixup.h"
#include "nsCDefaultURIFixup.h"
#include "nsIChromeRegistry.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "mozIApplication.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/BindingUtils.h"
#include <stdint.h>
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/StaticPtr.h"
#include "nsContentUtils.h"
#include "nsJSUtils.h"
#include "nsILoadInfo.h"
// This should be probably defined on some other place... but I couldn't find it
#define WEBAPPS_PERM_NAME "webapps-manage"
using namespace mozilla;
using namespace mozilla::dom;
nsIIOService *nsScriptSecurityManager::sIOService = nullptr;
nsIStringBundle *nsScriptSecurityManager::sStrBundle = nullptr;
JSRuntime *nsScriptSecurityManager::sRuntime = 0;
bool nsScriptSecurityManager::sStrictFileOriginPolicy = true;
///////////////////////////
// Convenience Functions //
///////////////////////////
class nsAutoInPrincipalDomainOriginSetter {
public:
nsAutoInPrincipalDomainOriginSetter() {
++sInPrincipalDomainOrigin;
}
~nsAutoInPrincipalDomainOriginSetter() {
--sInPrincipalDomainOrigin;
}
static uint32_t sInPrincipalDomainOrigin;
};
uint32_t nsAutoInPrincipalDomainOriginSetter::sInPrincipalDomainOrigin;
static
nsresult
GetOriginFromURI(nsIURI* aURI, nsACString& aOrigin)
{
if (nsAutoInPrincipalDomainOriginSetter::sInPrincipalDomainOrigin > 1) {
// Allow a single recursive call to GetPrincipalDomainOrigin, since that
// might be happening on a different principal from the first call. But
// after that, cut off the recursion; it just indicates that something
// we're doing in this method causes us to reenter a security check here.
return NS_ERROR_NOT_AVAILABLE;
}
nsAutoInPrincipalDomainOriginSetter autoSetter;
nsCOMPtr<nsIURI> uri = NS_GetInnermostURI(aURI);
NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED);
nsAutoCString hostPort;
nsresult rv = uri->GetHostPort(hostPort);
if (NS_SUCCEEDED(rv)) {
nsAutoCString scheme;
rv = uri->GetScheme(scheme);
NS_ENSURE_SUCCESS(rv, rv);
aOrigin = scheme + NS_LITERAL_CSTRING("://") + hostPort;
}
else {
// Some URIs (e.g., nsSimpleURI) don't support host. Just
// get the full spec.
rv = uri->GetSpec(aOrigin);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
static
nsresult
GetPrincipalDomainOrigin(nsIPrincipal* aPrincipal,
nsACString& aOrigin)
{
nsCOMPtr<nsIURI> uri;
aPrincipal->GetDomain(getter_AddRefs(uri));
if (!uri) {
aPrincipal->GetURI(getter_AddRefs(uri));
}
NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED);
return GetOriginFromURI(uri, aOrigin);
}
inline void SetPendingException(JSContext *cx, const char *aMsg)
{
JS_ReportError(cx, "%s", aMsg);
}
inline void SetPendingException(JSContext *cx, const char16_t *aMsg)
{
JS_ReportError(cx, "%hs", aMsg);
}
// Helper class to get stuff from the ClassInfo and not waste extra time with
// virtual method calls for things it has already gotten
class ClassInfoData
{
public:
ClassInfoData(nsIClassInfo *aClassInfo, const char *aName)
: mClassInfo(aClassInfo),
mName(const_cast<char *>(aName)),
mDidGetFlags(false),
mMustFreeName(false)
{
}
~ClassInfoData()
{
if (mMustFreeName)
free(mName);
}
uint32_t GetFlags()
{
if (!mDidGetFlags) {
if (mClassInfo) {
nsresult rv = mClassInfo->GetFlags(&mFlags);
if (NS_FAILED(rv)) {
mFlags = 0;
}
} else {
mFlags = 0;
}
mDidGetFlags = true;
}
return mFlags;
}
bool IsDOMClass()
{
return !!(GetFlags() & nsIClassInfo::DOM_OBJECT);
}
const char* GetName()
{
if (!mName) {
if (mClassInfo) {
mClassInfo->GetClassDescription(&mName);
}
if (mName) {
mMustFreeName = true;
} else {
mName = const_cast<char *>("UnnamedClass");
}
}
return mName;
}
private:
nsIClassInfo *mClassInfo; // WEAK
uint32_t mFlags;
char *mName;
bool mDidGetFlags;
bool mMustFreeName;
};
JSContext *
nsScriptSecurityManager::GetCurrentJSContext()
{
// Get JSContext from stack.
return nsXPConnect::XPConnect()->GetCurrentJSContext();
}
JSContext *
nsScriptSecurityManager::GetSafeJSContext()
{
// Get JSContext from stack.
return nsXPConnect::XPConnect()->GetSafeJSContext();
}
/* static */
bool
nsScriptSecurityManager::SecurityCompareURIs(nsIURI* aSourceURI,
nsIURI* aTargetURI)
{
return NS_SecurityCompareURIs(aSourceURI, aTargetURI, sStrictFileOriginPolicy);
}
// SecurityHashURI is consistent with SecurityCompareURIs because NS_SecurityHashURI
// is consistent with NS_SecurityCompareURIs. See nsNetUtil.h.
uint32_t
nsScriptSecurityManager::SecurityHashURI(nsIURI* aURI)
{
return NS_SecurityHashURI(aURI);
}
uint16_t
nsScriptSecurityManager::AppStatusForPrincipal(nsIPrincipal *aPrin)
{
uint32_t appId = aPrin->GetAppId();
bool inMozBrowser = aPrin->GetIsInBrowserElement();
NS_WARN_IF_FALSE(appId != nsIScriptSecurityManager::UNKNOWN_APP_ID,
"Asking for app status on a principal with an unknown app id");
// Installed apps have a valid app id (not NO_APP_ID or UNKNOWN_APP_ID)
// and they are not inside a mozbrowser.
if (appId == nsIScriptSecurityManager::NO_APP_ID ||
appId == nsIScriptSecurityManager::UNKNOWN_APP_ID || inMozBrowser)
{
return nsIPrincipal::APP_STATUS_NOT_INSTALLED;
}
nsCOMPtr<nsIAppsService> appsService = do_GetService(APPS_SERVICE_CONTRACTID);
NS_ENSURE_TRUE(appsService, nsIPrincipal::APP_STATUS_NOT_INSTALLED);
nsCOMPtr<mozIApplication> app;
appsService->GetAppByLocalId(appId, getter_AddRefs(app));
NS_ENSURE_TRUE(app, nsIPrincipal::APP_STATUS_NOT_INSTALLED);
uint16_t status = nsIPrincipal::APP_STATUS_INSTALLED;
NS_ENSURE_SUCCESS(app->GetAppStatus(&status),
nsIPrincipal::APP_STATUS_NOT_INSTALLED);
nsString appOrigin;
NS_ENSURE_SUCCESS(app->GetOrigin(appOrigin),
nsIPrincipal::APP_STATUS_NOT_INSTALLED);
nsCOMPtr<nsIURI> appURI;
NS_ENSURE_SUCCESS(NS_NewURI(getter_AddRefs(appURI), appOrigin),
nsIPrincipal::APP_STATUS_NOT_INSTALLED);
// The app could contain a cross-origin iframe - make sure that the content
// is actually same-origin with the app.
MOZ_ASSERT(inMozBrowser == false, "Checked this above");
OriginAttributes attrs(appId, false);
nsCOMPtr<nsIPrincipal> appPrin = BasePrincipal::CreateCodebasePrincipal(appURI, attrs);
NS_ENSURE_TRUE(appPrin, nsIPrincipal::APP_STATUS_NOT_INSTALLED);
return aPrin->Equals(appPrin) ? status
: nsIPrincipal::APP_STATUS_NOT_INSTALLED;
}
/*
* GetChannelResultPrincipal will return the principal that the resource
* returned by this channel will use. For example, if the resource is in
* a sandbox, it will return the nullprincipal. If the resource is forced
* to inherit principal, it will return the principal of its parent. If
* the load doesn't require sandboxing or inheriting, it will return the same
* principal as GetChannelURIPrincipal. Namely the principal of the URI
* that is being loaded.
*/
NS_IMETHODIMP
nsScriptSecurityManager::GetChannelResultPrincipal(nsIChannel* aChannel,
nsIPrincipal** aPrincipal)
{
NS_PRECONDITION(aChannel, "Must have channel!");
nsCOMPtr<nsISupports> owner;
aChannel->GetOwner(getter_AddRefs(owner));
if (owner) {
CallQueryInterface(owner, aPrincipal);
if (*aPrincipal) {
return NS_OK;
}
}
// Check whether we have an nsILoadInfo that says what we should do.
nsCOMPtr<nsILoadInfo> loadInfo;
aChannel->GetLoadInfo(getter_AddRefs(loadInfo));
if (loadInfo) {
if (loadInfo->GetLoadingSandboxed()) {
nsRefPtr<nsNullPrincipal> prin =
nsNullPrincipal::CreateWithInheritedAttributes(loadInfo->LoadingPrincipal());
NS_ENSURE_TRUE(prin, NS_ERROR_FAILURE);
prin.forget(aPrincipal);
return NS_OK;
}
if (loadInfo->GetForceInheritPrincipal()) {
NS_ADDREF(*aPrincipal = loadInfo->TriggeringPrincipal());
return NS_OK;
}
}
return GetChannelURIPrincipal(aChannel, aPrincipal);
}
/* The principal of the URI that this channel is loading. This is never
* affected by things like sandboxed loads, or loads where we forcefully
* inherit the principal. Think of this as the principal of the server
* which this channel is loading from. Most callers should use
* GetChannelResultPrincipal instead of GetChannelURIPrincipal. Only
* call GetChannelURIPrincipal if you are sure that you want the
* principal that matches the uri, even in cases when the load is
* sandboxed or when the load could be a blob or data uri (i.e even when
* you encounter loads that may or may not be sandboxed and loads
* that may or may not inherit)."
*/
NS_IMETHODIMP
nsScriptSecurityManager::GetChannelURIPrincipal(nsIChannel* aChannel,
nsIPrincipal** aPrincipal)
{
NS_PRECONDITION(aChannel, "Must have channel!");
// Get the principal from the URI. Make sure this does the same thing
// as nsDocument::Reset and XULDocument::StartDocumentLoad.
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsILoadContext> loadContext;
NS_QueryNotificationCallbacks(aChannel, loadContext);
if (loadContext) {
return GetLoadContextCodebasePrincipal(uri, loadContext, aPrincipal);
}
OriginAttributes attrs(UNKNOWN_APP_ID, false);
nsCOMPtr<nsIPrincipal> prin = BasePrincipal::CreateCodebasePrincipal(uri, attrs);
prin.forget(aPrincipal);
return *aPrincipal ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsScriptSecurityManager::IsSystemPrincipal(nsIPrincipal* aPrincipal,
bool* aIsSystem)
{
*aIsSystem = (aPrincipal == mSystemPrincipal);
return NS_OK;
}
/////////////////////////////
// nsScriptSecurityManager //
/////////////////////////////
////////////////////////////////////
// Methods implementing ISupports //
////////////////////////////////////
NS_IMPL_ISUPPORTS(nsScriptSecurityManager,
nsIScriptSecurityManager,
nsIChannelEventSink,
nsIObserver)
///////////////////////////////////////////////////
// Methods implementing nsIScriptSecurityManager //
///////////////////////////////////////////////////
///////////////// Security Checks /////////////////
bool
nsScriptSecurityManager::ContentSecurityPolicyPermitsJSAction(JSContext *cx)
{
MOZ_ASSERT(cx == nsContentUtils::GetCurrentJSContext());
nsCOMPtr<nsIPrincipal> subjectPrincipal = nsContentUtils::SubjectPrincipal();
nsCOMPtr<nsIContentSecurityPolicy> csp;
nsresult rv = subjectPrincipal->GetCsp(getter_AddRefs(csp));
NS_ASSERTION(NS_SUCCEEDED(rv), "CSP: Failed to get CSP from principal.");
// don't do anything unless there's a CSP
if (!csp)
return true;
bool evalOK = true;
bool reportViolation = false;
rv = csp->GetAllowsEval(&reportViolation, &evalOK);
if (NS_FAILED(rv))
{
NS_WARNING("CSP: failed to get allowsEval");
return true; // fail open to not break sites.
}
if (reportViolation) {
nsAutoString fileName;
unsigned lineNum = 0;
NS_NAMED_LITERAL_STRING(scriptSample, "call to eval() or related function blocked by CSP");
JS::AutoFilename scriptFilename;
if (JS::DescribeScriptedCaller(cx, &scriptFilename, &lineNum)) {
if (const char *file = scriptFilename.get()) {
CopyUTF8toUTF16(nsDependentCString(file), fileName);
}
}
csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_EVAL,
fileName,
scriptSample,
lineNum,
EmptyString(),
EmptyString());
}
return evalOK;
}
// static
bool
nsScriptSecurityManager::JSPrincipalsSubsume(JSPrincipals *first,
JSPrincipals *second)
{
return nsJSPrincipals::get(first)->Subsumes(nsJSPrincipals::get(second));
}
NS_IMETHODIMP
nsScriptSecurityManager::CheckSameOriginURI(nsIURI* aSourceURI,
nsIURI* aTargetURI,
bool reportError)
{
if (!SecurityCompareURIs(aSourceURI, aTargetURI))
{
if (reportError) {
ReportError(nullptr, NS_LITERAL_STRING("CheckSameOriginError"),
aSourceURI, aTargetURI);
}
return NS_ERROR_DOM_BAD_URI;
}
return NS_OK;
}
/*static*/ uint32_t
nsScriptSecurityManager::HashPrincipalByOrigin(nsIPrincipal* aPrincipal)
{
nsCOMPtr<nsIURI> uri;
aPrincipal->GetDomain(getter_AddRefs(uri));
if (!uri)
aPrincipal->GetURI(getter_AddRefs(uri));
return SecurityHashURI(uri);
}
NS_IMETHODIMP
nsScriptSecurityManager::CheckLoadURIFromScript(JSContext *cx, nsIURI *aURI)
{
// Get principal of currently executing script.
MOZ_ASSERT(cx == nsContentUtils::GetCurrentJSContext());
nsIPrincipal* principal = nsContentUtils::SubjectPrincipal();
nsresult rv = CheckLoadURIWithPrincipal(principal, aURI,
nsIScriptSecurityManager::STANDARD);
if (NS_SUCCEEDED(rv)) {
// OK to load
return NS_OK;
}
// See if we're attempting to load a file: URI. If so, let a
// UniversalXPConnect capability trump the above check.
bool isFile = false;
bool isRes = false;
if (NS_FAILED(aURI->SchemeIs("file", &isFile)) ||
NS_FAILED(aURI->SchemeIs("resource", &isRes)))
return NS_ERROR_FAILURE;
if (isFile || isRes)
{
if (nsContentUtils::IsCallerChrome())
return NS_OK;
}
// Report error.
nsAutoCString spec;
if (NS_FAILED(aURI->GetAsciiSpec(spec)))
return NS_ERROR_FAILURE;
nsAutoCString msg("Access to '");
msg.Append(spec);
msg.AppendLiteral("' from script denied");
SetPendingException(cx, msg.get());
return NS_ERROR_DOM_BAD_URI;
}
/**
* Helper method to handle cases where a flag passed to
* CheckLoadURIWithPrincipal means denying loading if the given URI has certain
* nsIProtocolHandler flags set.
* @return if success, access is allowed. Otherwise, deny access
*/
static nsresult
DenyAccessIfURIHasFlags(nsIURI* aURI, uint32_t aURIFlags)
{
NS_PRECONDITION(aURI, "Must have URI!");
bool uriHasFlags;
nsresult rv =
NS_URIChainHasFlags(aURI, aURIFlags, &uriHasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (uriHasFlags) {
return NS_ERROR_DOM_BAD_URI;
}
return NS_OK;
}
static bool
EqualOrSubdomain(nsIURI* aProbeArg, nsIURI* aBase)
{
// Make a clone of the incoming URI, because we're going to mutate it.
nsCOMPtr<nsIURI> probe;
nsresult rv = aProbeArg->Clone(getter_AddRefs(probe));
NS_ENSURE_SUCCESS(rv, false);
nsCOMPtr<nsIEffectiveTLDService> tldService = do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);
NS_ENSURE_TRUE(tldService, false);
while (true) {
if (nsScriptSecurityManager::SecurityCompareURIs(probe, aBase)) {
return true;
}
nsAutoCString host, newHost;
nsresult rv = probe->GetHost(host);
NS_ENSURE_SUCCESS(rv, false);
rv = tldService->GetNextSubDomain(host, newHost);
if (rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
return false;
}
NS_ENSURE_SUCCESS(rv, false);
rv = probe->SetHost(newHost);
NS_ENSURE_SUCCESS(rv, false);
}
}
NS_IMETHODIMP
nsScriptSecurityManager::CheckLoadURIWithPrincipal(nsIPrincipal* aPrincipal,
nsIURI *aTargetURI,
uint32_t aFlags)
{
NS_PRECONDITION(aPrincipal, "CheckLoadURIWithPrincipal must have a principal");
// If someone passes a flag that we don't understand, we should
// fail, because they may need a security check that we don't
// provide.
NS_ENSURE_FALSE(aFlags & ~(nsIScriptSecurityManager::LOAD_IS_AUTOMATIC_DOCUMENT_REPLACEMENT |
nsIScriptSecurityManager::ALLOW_CHROME |
nsIScriptSecurityManager::DISALLOW_SCRIPT |
nsIScriptSecurityManager::DISALLOW_INHERIT_PRINCIPAL |
nsIScriptSecurityManager::DONT_REPORT_ERRORS),
NS_ERROR_UNEXPECTED);
NS_ENSURE_ARG_POINTER(aPrincipal);
NS_ENSURE_ARG_POINTER(aTargetURI);
// If DISALLOW_INHERIT_PRINCIPAL is set, we prevent loading of URIs which
// would do such inheriting. That would be URIs that do not have their own
// security context. We do this even for the system principal.
if (aFlags & nsIScriptSecurityManager::DISALLOW_INHERIT_PRINCIPAL) {
nsresult rv =
DenyAccessIfURIHasFlags(aTargetURI,
nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT);
NS_ENSURE_SUCCESS(rv, rv);
}
if (aPrincipal == mSystemPrincipal) {
// Allow access
return NS_OK;
}
nsCOMPtr<nsIURI> sourceURI;
aPrincipal->GetURI(getter_AddRefs(sourceURI));
if (!sourceURI) {
nsCOMPtr<nsIExpandedPrincipal> expanded = do_QueryInterface(aPrincipal);
if (expanded) {
nsTArray< nsCOMPtr<nsIPrincipal> > *whiteList;
expanded->GetWhiteList(&whiteList);
for (uint32_t i = 0; i < whiteList->Length(); ++i) {
nsresult rv = CheckLoadURIWithPrincipal((*whiteList)[i],
aTargetURI,
aFlags);
if (NS_SUCCEEDED(rv)) {
// Allow access if it succeeded with one of the white listed principals
return NS_OK;
}
}
// None of our whitelisted principals worked.
return NS_ERROR_DOM_BAD_URI;
}
NS_ERROR("Non-system principals or expanded principal passed to CheckLoadURIWithPrincipal "
"must have a URI!");
return NS_ERROR_UNEXPECTED;
}
// Automatic loads are not allowed from certain protocols.
if (aFlags & nsIScriptSecurityManager::LOAD_IS_AUTOMATIC_DOCUMENT_REPLACEMENT) {
nsresult rv =
DenyAccessIfURIHasFlags(sourceURI,
nsIProtocolHandler::URI_FORBIDS_AUTOMATIC_DOCUMENT_REPLACEMENT);
NS_ENSURE_SUCCESS(rv, rv);
}
// If either URI is a nested URI, get the base URI
nsCOMPtr<nsIURI> sourceBaseURI = NS_GetInnermostURI(sourceURI);
nsCOMPtr<nsIURI> targetBaseURI = NS_GetInnermostURI(aTargetURI);
//-- get the target scheme
nsAutoCString targetScheme;
nsresult rv = targetBaseURI->GetScheme(targetScheme);
if (NS_FAILED(rv)) return rv;
//-- Some callers do not allow loading javascript:
if ((aFlags & nsIScriptSecurityManager::DISALLOW_SCRIPT) &&
targetScheme.EqualsLiteral("javascript"))
{
return NS_ERROR_DOM_BAD_URI;
}
NS_NAMED_LITERAL_STRING(errorTag, "CheckLoadURIError");
bool reportErrors = !(aFlags & nsIScriptSecurityManager::DONT_REPORT_ERRORS);
// Check for uris that are only loadable by principals that subsume them
bool hasFlags;
rv = NS_URIChainHasFlags(targetBaseURI,
nsIProtocolHandler::URI_LOADABLE_BY_SUBSUMERS,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) {
return aPrincipal->CheckMayLoad(targetBaseURI, true, false);
}
//-- get the source scheme
nsAutoCString sourceScheme;
rv = sourceBaseURI->GetScheme(sourceScheme);
if (NS_FAILED(rv)) return rv;
if (sourceScheme.LowerCaseEqualsLiteral(NS_NULLPRINCIPAL_SCHEME)) {
// A null principal can target its own URI.
if (sourceURI == aTargetURI) {
return NS_OK;
}
}
else if (targetScheme.Equals(sourceScheme,
nsCaseInsensitiveCStringComparator()))
{
// every scheme can access another URI from the same scheme,
// as long as they don't represent null principals...
// Or they don't require an special permission to do so
// See bug#773886
bool hasFlags;
rv = NS_URIChainHasFlags(targetBaseURI,
nsIProtocolHandler::URI_CROSS_ORIGIN_NEEDS_WEBAPPS_PERM,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) {
// Let apps load the whitelisted theme resources even if they don't
// have the webapps-manage permission but have the themeable one.
// Resources from the theme origin are also allowed to load from
// the theme origin (eg. stylesheets using images from the theme).
auto themeOrigin = Preferences::GetCString("b2g.theme.origin");
if (themeOrigin) {
nsAutoCString targetOrigin;
nsPrincipal::GetOriginForURI(targetBaseURI, targetOrigin);
if (targetOrigin.Equals(themeOrigin)) {
nsAutoCString pOrigin;
aPrincipal->GetOrigin(pOrigin);
return nsContentUtils::IsExactSitePermAllow(aPrincipal, "themeable") ||
pOrigin.Equals(themeOrigin)
? NS_OK : NS_ERROR_DOM_BAD_URI;
}
}
// In this case, we allow opening only if the source and target URIS
// are on the same domain, or the opening URI has the webapps
// permision granted
if (!SecurityCompareURIs(sourceBaseURI, targetBaseURI) &&
!nsContentUtils::IsExactSitePermAllow(aPrincipal, WEBAPPS_PERM_NAME)) {
return NS_ERROR_DOM_BAD_URI;
}
}
return NS_OK;
}
// If the schemes don't match, the policy is specified by the protocol
// flags on the target URI. Note that the order of policy checks here is
// very important! We start from most restrictive and work our way down.
// Note that since we're working with the innermost URI, we can just use
// the methods that work on chains of nested URIs and they will only look
// at the flags for our one URI.
// Check for system target URI
rv = DenyAccessIfURIHasFlags(targetBaseURI,
nsIProtocolHandler::URI_DANGEROUS_TO_LOAD);
if (NS_FAILED(rv)) {
// Deny access, since the origin principal is not system
if (reportErrors) {
ReportError(nullptr, errorTag, sourceURI, aTargetURI);
}
return rv;
}
// Check for chrome target URI
rv = NS_URIChainHasFlags(targetBaseURI,
nsIProtocolHandler::URI_IS_UI_RESOURCE,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) {
if (aFlags & nsIScriptSecurityManager::ALLOW_CHROME) {
// For now, don't change behavior for resource:// or moz-icon:// and
// just allow them.
if (!targetScheme.EqualsLiteral("chrome")) {
return NS_OK;
}
// Allow a URI_IS_UI_RESOURCE source to link to a URI_IS_UI_RESOURCE
// target if ALLOW_CHROME is set.
//
// ALLOW_CHROME is a flag that we pass on all loads _except_ docshell
// loads (since docshell loads run the loaded content with its origin
// principal). So we're effectively allowing resource://, chrome://,
// and moz-icon:// source URIs to load resource://, chrome://, and
// moz-icon:// files, so long as they're not loading it as a document.
bool sourceIsUIResource;
rv = NS_URIChainHasFlags(sourceBaseURI,
nsIProtocolHandler::URI_IS_UI_RESOURCE,
&sourceIsUIResource);
NS_ENSURE_SUCCESS(rv, rv);
if (sourceIsUIResource) {
return NS_OK;
}
// Allow the load only if the chrome package is whitelisted.
nsCOMPtr<nsIXULChromeRegistry> reg(do_GetService(
NS_CHROMEREGISTRY_CONTRACTID));
if (reg) {
bool accessAllowed = false;
reg->AllowContentToAccess(targetBaseURI, &accessAllowed);
if (accessAllowed) {
return NS_OK;
}
}
}
// Special-case the hidden window: it's allowed to load
// URI_IS_UI_RESOURCE no matter what. Bug 1145470 tracks removing this.
nsAutoCString sourceSpec;
if (NS_SUCCEEDED(sourceBaseURI->GetSpec(sourceSpec)) &&
sourceSpec.EqualsLiteral("resource://gre-resources/hiddenWindow.html")) {
return NS_OK;
}
if (reportErrors) {
ReportError(nullptr, errorTag, sourceURI, aTargetURI);
}
return NS_ERROR_DOM_BAD_URI;
}
// Check for target URI pointing to a file
rv = NS_URIChainHasFlags(targetBaseURI,
nsIProtocolHandler::URI_IS_LOCAL_FILE,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) {
// Allow domains that were whitelisted in the prefs. In 99.9% of cases,
// this array is empty.
for (size_t i = 0; i < mFileURIWhitelist.Length(); ++i) {
if (EqualOrSubdomain(sourceURI, mFileURIWhitelist[i])) {
return NS_OK;
}
}
// resource: and chrome: are equivalent, securitywise
// That's bogus!! Fix this. But watch out for
// the view-source stylesheet?
bool sourceIsChrome;
rv = NS_URIChainHasFlags(sourceURI,
nsIProtocolHandler::URI_IS_UI_RESOURCE,
&sourceIsChrome);
NS_ENSURE_SUCCESS(rv, rv);
if (sourceIsChrome) {
return NS_OK;
}
if (reportErrors) {
ReportError(nullptr, errorTag, sourceURI, aTargetURI);
}
return NS_ERROR_DOM_BAD_URI;
}
// OK, everyone is allowed to load this, since unflagged handlers are
// deprecated but treated as URI_LOADABLE_BY_ANYONE. But check whether we
// need to warn. At some point we'll want to make this warning into an
// error and treat unflagged handlers as URI_DANGEROUS_TO_LOAD.
rv = NS_URIChainHasFlags(targetBaseURI,
nsIProtocolHandler::URI_LOADABLE_BY_ANYONE,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (!hasFlags) {
nsXPIDLString message;
NS_ConvertASCIItoUTF16 ucsTargetScheme(targetScheme);
const char16_t* formatStrings[] = { ucsTargetScheme.get() };
rv = sStrBundle->
FormatStringFromName(MOZ_UTF16("ProtocolFlagError"),
formatStrings,
ArrayLength(formatStrings),
getter_Copies(message));
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIConsoleService> console(
do_GetService("@mozilla.org/consoleservice;1"));
NS_ENSURE_TRUE(console, NS_ERROR_FAILURE);
console->LogStringMessage(message.get());
}
}
return NS_OK;
}
nsresult
nsScriptSecurityManager::ReportError(JSContext* cx, const nsAString& messageTag,
nsIURI* aSource, nsIURI* aTarget)
{
nsresult rv;
NS_ENSURE_TRUE(aSource && aTarget, NS_ERROR_NULL_POINTER);
// Get the source URL spec
nsAutoCString sourceSpec;
rv = aSource->GetAsciiSpec(sourceSpec);
NS_ENSURE_SUCCESS(rv, rv);
// Get the target URL spec
nsAutoCString targetSpec;
rv = aTarget->GetAsciiSpec(targetSpec);
NS_ENSURE_SUCCESS(rv, rv);
// Localize the error message
nsXPIDLString message;
NS_ConvertASCIItoUTF16 ucsSourceSpec(sourceSpec);
NS_ConvertASCIItoUTF16 ucsTargetSpec(targetSpec);
const char16_t *formatStrings[] = { ucsSourceSpec.get(), ucsTargetSpec.get() };
rv = sStrBundle->FormatStringFromName(PromiseFlatString(messageTag).get(),
formatStrings,
ArrayLength(formatStrings),
getter_Copies(message));
NS_ENSURE_SUCCESS(rv, rv);
// If a JS context was passed in, set a JS exception.
// Otherwise, print the error message directly to the JS console
// and to standard output
if (cx)
{
SetPendingException(cx, message.get());
}
else // Print directly to the console
{
nsCOMPtr<nsIConsoleService> console(
do_GetService("@mozilla.org/consoleservice;1"));
NS_ENSURE_TRUE(console, NS_ERROR_FAILURE);
console->LogStringMessage(message.get());
}
return NS_OK;
}
NS_IMETHODIMP
nsScriptSecurityManager::CheckLoadURIStrWithPrincipal(nsIPrincipal* aPrincipal,
const nsACString& aTargetURIStr,
uint32_t aFlags)
{
nsresult rv;
nsCOMPtr<nsIURI> target;
rv = NS_NewURI(getter_AddRefs(target), aTargetURIStr,
nullptr, nullptr, sIOService);
NS_ENSURE_SUCCESS(rv, rv);
rv = CheckLoadURIWithPrincipal(aPrincipal, target, aFlags);
if (rv == NS_ERROR_DOM_BAD_URI) {
// Don't warn because NS_ERROR_DOM_BAD_URI is one of the expected
// return values.
return rv;
}
NS_ENSURE_SUCCESS(rv, rv);
// Now start testing fixup -- since aTargetURIStr is a string, not
// an nsIURI, we may well end up fixing it up before loading.
// Note: This needs to stay in sync with the nsIURIFixup api.
nsCOMPtr<nsIURIFixup> fixup = do_GetService(NS_URIFIXUP_CONTRACTID);
if (!fixup) {
return rv;
}
uint32_t flags[] = {
nsIURIFixup::FIXUP_FLAG_NONE,
nsIURIFixup::FIXUP_FLAG_FIX_SCHEME_TYPOS,
nsIURIFixup::FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP,
nsIURIFixup::FIXUP_FLAGS_MAKE_ALTERNATE_URI,
nsIURIFixup::FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP |
nsIURIFixup::FIXUP_FLAGS_MAKE_ALTERNATE_URI
};
for (uint32_t i = 0; i < ArrayLength(flags); ++i) {
rv = fixup->CreateFixupURI(aTargetURIStr, flags[i], nullptr,
getter_AddRefs(target));
NS_ENSURE_SUCCESS(rv, rv);
rv = CheckLoadURIWithPrincipal(aPrincipal, target, aFlags);
if (rv == NS_ERROR_DOM_BAD_URI) {
// Don't warn because NS_ERROR_DOM_BAD_URI is one of the expected
// return values.
return rv;
}
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
bool
nsScriptSecurityManager::ScriptAllowed(JSObject *aGlobal)
{
MOZ_ASSERT(aGlobal);
MOZ_ASSERT(JS_IsGlobalObject(aGlobal) || js::IsOuterObject(aGlobal));
// Check the bits on the compartment private.
return xpc::Scriptability::Get(aGlobal).Allowed();
}
///////////////// Principals ///////////////////////
NS_IMETHODIMP
nsScriptSecurityManager::GetSystemPrincipal(nsIPrincipal **result)
{
NS_ADDREF(*result = mSystemPrincipal);
return NS_OK;
}
NS_IMETHODIMP
nsScriptSecurityManager::GetSimpleCodebasePrincipal(nsIURI* aURI,
nsIPrincipal** aPrincipal)
{
OriginAttributes attrs(UNKNOWN_APP_ID, false);
nsCOMPtr<nsIPrincipal> prin = BasePrincipal::CreateCodebasePrincipal(aURI, attrs);
prin.forget(aPrincipal);
return *aPrincipal ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsScriptSecurityManager::GetNoAppCodebasePrincipal(nsIURI* aURI,
nsIPrincipal** aPrincipal)
{
OriginAttributes attrs(NO_APP_ID, false);
nsCOMPtr<nsIPrincipal> prin = BasePrincipal::CreateCodebasePrincipal(aURI, attrs);
prin.forget(aPrincipal);
return *aPrincipal ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsScriptSecurityManager::GetCodebasePrincipal(nsIURI* aURI,
nsIPrincipal** aPrincipal)
{