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gecko-dev/dom/security/nsContentSecurityManager.cpp

588 строки
20 KiB
C++
Исходник Ответственный История

#include "nsContentSecurityManager.h"
#include "nsIChannel.h"
#include "nsIStreamListener.h"
#include "nsILoadInfo.h"
#include "nsContentUtils.h"
#include "nsCORSListenerProxy.h"
#include "nsIStreamListener.h"
#include "mozilla/dom/Element.h"
NS_IMPL_ISUPPORTS(nsContentSecurityManager,
nsIContentSecurityManager,
nsIChannelEventSink)
static nsresult
ValidateSecurityFlags(nsILoadInfo* aLoadInfo)
{
nsSecurityFlags securityMode = aLoadInfo->GetSecurityMode();
if (securityMode != nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS &&
securityMode != nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED &&
securityMode != nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS &&
securityMode != nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL &&
securityMode != nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) {
MOZ_ASSERT(false, "need one securityflag from nsILoadInfo to perform security checks");
return NS_ERROR_FAILURE;
}
// all good, found the right security flags
return NS_OK;
}
static bool SchemeIs(nsIURI* aURI, const char* aScheme)
{
nsCOMPtr<nsIURI> baseURI = NS_GetInnermostURI(aURI);
NS_ENSURE_TRUE(baseURI, false);
bool isScheme = false;
return NS_SUCCEEDED(baseURI->SchemeIs(aScheme, &isScheme)) && isScheme;
}
static nsresult
DoCheckLoadURIChecks(nsIURI* aURI, nsILoadInfo* aLoadInfo)
{
// Bug 1228117: determine the correct security policy for DTD loads
if (aLoadInfo->GetExternalContentPolicyType() == nsIContentPolicy::TYPE_DTD) {
return NS_OK;
}
nsresult rv = NS_OK;
nsCOMPtr<nsIPrincipal> loadingPrincipal = aLoadInfo->LoadingPrincipal();
uint32_t flags = nsIScriptSecurityManager::STANDARD;
if (aLoadInfo->GetAllowChrome()) {
flags |= nsIScriptSecurityManager::ALLOW_CHROME;
}
// We don't have a loadingPrincipal for TYPE_DOCUMENT
if (aLoadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_DOCUMENT) {
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(loadingPrincipal,
aURI,
flags);
NS_ENSURE_SUCCESS(rv, rv);
}
// If the loadingPrincipal and the triggeringPrincipal are different, then make
// sure the triggeringPrincipal is allowed to access that URI.
nsCOMPtr<nsIPrincipal> triggeringPrincipal = aLoadInfo->TriggeringPrincipal();
if (loadingPrincipal != triggeringPrincipal) {
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(triggeringPrincipal,
aURI,
flags);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
static bool
URIHasFlags(nsIURI* aURI, uint32_t aURIFlags)
{
bool hasFlags;
nsresult rv = NS_URIChainHasFlags(aURI, aURIFlags, &hasFlags);
NS_ENSURE_SUCCESS(rv, false);
return hasFlags;
}
static nsresult
DoSOPChecks(nsIURI* aURI, nsILoadInfo* aLoadInfo, nsIChannel* aChannel)
{
if (aLoadInfo->GetAllowChrome() &&
(URIHasFlags(aURI, nsIProtocolHandler::URI_IS_UI_RESOURCE) ||
SchemeIs(aURI, "moz-safe-about"))) {
// UI resources are allowed.
return DoCheckLoadURIChecks(aURI, aLoadInfo);
}
NS_ENSURE_FALSE(NS_HasBeenCrossOrigin(aChannel, true),
NS_ERROR_DOM_BAD_URI);
return NS_OK;
}
static nsresult
DoCORSChecks(nsIChannel* aChannel, nsILoadInfo* aLoadInfo,
nsCOMPtr<nsIStreamListener>& aInAndOutListener)
{
MOZ_RELEASE_ASSERT(aInAndOutListener, "can not perform CORS checks without a listener");
// No need to set up CORS if TriggeringPrincipal is the SystemPrincipal.
// For example, allow user stylesheets to load XBL from external files
// without requiring CORS.
if (nsContentUtils::IsSystemPrincipal(aLoadInfo->TriggeringPrincipal())) {
return NS_OK;
}
nsIPrincipal* loadingPrincipal = aLoadInfo->LoadingPrincipal();
RefPtr<nsCORSListenerProxy> corsListener =
new nsCORSListenerProxy(aInAndOutListener,
loadingPrincipal,
aLoadInfo->GetCookiePolicy() ==
nsILoadInfo::SEC_COOKIES_INCLUDE);
// XXX: @arg: DataURIHandling::Allow
// lets use DataURIHandling::Allow for now and then decide on callsite basis. see also:
// http://mxr.mozilla.org/mozilla-central/source/dom/security/nsCORSListenerProxy.h#33
nsresult rv = corsListener->Init(aChannel, DataURIHandling::Allow);
NS_ENSURE_SUCCESS(rv, rv);
aInAndOutListener = corsListener;
return NS_OK;
}
static nsresult
DoContentSecurityChecks(nsIURI* aURI, nsILoadInfo* aLoadInfo)
{
nsContentPolicyType contentPolicyType =
aLoadInfo->GetExternalContentPolicyType();
nsContentPolicyType internalContentPolicyType =
aLoadInfo->InternalContentPolicyType();
nsCString mimeTypeGuess;
nsCOMPtr<nsINode> requestingContext = nullptr;
switch(contentPolicyType) {
case nsIContentPolicy::TYPE_OTHER: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_SCRIPT: {
mimeTypeGuess = NS_LITERAL_CSTRING("application/javascript");
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_IMAGE: {
MOZ_ASSERT(false, "contentPolicyType not supported yet");
break;
}
case nsIContentPolicy::TYPE_STYLESHEET: {
mimeTypeGuess = NS_LITERAL_CSTRING("text/css");
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_OBJECT:
case nsIContentPolicy::TYPE_DOCUMENT: {
MOZ_ASSERT(false, "contentPolicyType not supported yet");
break;
}
case nsIContentPolicy::TYPE_SUBDOCUMENT: {
mimeTypeGuess = NS_LITERAL_CSTRING("text/html");
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE,
"type_subdocument requires requestingContext of type Document");
break;
}
case nsIContentPolicy::TYPE_REFRESH: {
MOZ_ASSERT(false, "contentPolicyType not supported yet");
break;
}
case nsIContentPolicy::TYPE_XBL: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_PING: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_XMLHTTPREQUEST: {
// alias nsIContentPolicy::TYPE_DATAREQUEST:
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE,
"type_xml requires requestingContext of type Document");
// We're checking for the external TYPE_XMLHTTPREQUEST here in case
// an addon creates a request with that type.
if (internalContentPolicyType ==
nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST ||
internalContentPolicyType ==
nsIContentPolicy::TYPE_XMLHTTPREQUEST) {
mimeTypeGuess = EmptyCString();
}
else {
MOZ_ASSERT(internalContentPolicyType ==
nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE,
"can not set mime type guess for unexpected internal type");
mimeTypeGuess = NS_LITERAL_CSTRING(TEXT_EVENT_STREAM);
}
break;
}
case nsIContentPolicy::TYPE_OBJECT_SUBREQUEST: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::ELEMENT_NODE,
"type_subrequest requires requestingContext of type Element");
break;
}
case nsIContentPolicy::TYPE_DTD: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE,
"type_dtd requires requestingContext of type Document");
break;
}
case nsIContentPolicy::TYPE_FONT: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_MEDIA: {
if (internalContentPolicyType == nsIContentPolicy::TYPE_INTERNAL_TRACK) {
mimeTypeGuess = NS_LITERAL_CSTRING("text/vtt");
}
else {
mimeTypeGuess = EmptyCString();
}
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::ELEMENT_NODE,
"type_media requires requestingContext of type Element");
break;
}
case nsIContentPolicy::TYPE_WEBSOCKET: {
MOZ_ASSERT(false, "contentPolicyType not supported yet");
break;
}
case nsIContentPolicy::TYPE_CSP_REPORT: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_XSLT: {
mimeTypeGuess = NS_LITERAL_CSTRING("application/xml");
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE,
"type_xslt requires requestingContext of type Document");
break;
}
case nsIContentPolicy::TYPE_BEACON: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
MOZ_ASSERT(!requestingContext ||
requestingContext->NodeType() == nsIDOMNode::DOCUMENT_NODE,
"type_beacon requires requestingContext of type Document");
break;
}
case nsIContentPolicy::TYPE_FETCH: {
mimeTypeGuess = EmptyCString();
requestingContext = aLoadInfo->LoadingNode();
break;
}
case nsIContentPolicy::TYPE_IMAGESET: {
MOZ_ASSERT(false, "contentPolicyType not supported yet");
break;
}
case nsIContentPolicy::TYPE_WEB_MANIFEST: {
mimeTypeGuess = NS_LITERAL_CSTRING("application/manifest+json");
requestingContext = aLoadInfo->LoadingNode();
break;
}
default:
// nsIContentPolicy::TYPE_INVALID
MOZ_ASSERT(false, "can not perform security check without a valid contentType");
}
int16_t shouldLoad = nsIContentPolicy::ACCEPT;
nsresult rv = NS_CheckContentLoadPolicy(internalContentPolicyType,
aURI,
aLoadInfo->LoadingPrincipal(),
requestingContext,
mimeTypeGuess,
nullptr, //extra,
&shouldLoad,
nsContentUtils::GetContentPolicy(),
nsContentUtils::GetSecurityManager());
NS_ENSURE_SUCCESS(rv, rv);
if (NS_CP_REJECTED(shouldLoad)) {
return NS_ERROR_CONTENT_BLOCKED;
}
return NS_OK;
}
/*
* Based on the security flags provided in the loadInfo of the channel,
* doContentSecurityCheck() performs the following content security checks
* before opening the channel:
*
* (1) Same Origin Policy Check (if applicable)
* (2) Allow Cross Origin but perform sanity checks whether a principal
* is allowed to access the following URL.
* (3) Perform CORS check (if applicable)
* (4) ContentPolicy checks (Content-Security-Policy, Mixed Content, ...)
*
* @param aChannel
* The channel to perform the security checks on.
* @param aInAndOutListener
* The streamListener that is passed to channel->AsyncOpen2() that is now potentially
* wrappend within nsCORSListenerProxy() and becomes the corsListener that now needs
* to be set as new streamListener on the channel.
*/
nsresult
nsContentSecurityManager::doContentSecurityCheck(nsIChannel* aChannel,
nsCOMPtr<nsIStreamListener>& aInAndOutListener)
{
NS_ENSURE_ARG(aChannel);
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
if (!loadInfo) {
MOZ_ASSERT(false, "channel needs to have loadInfo to perform security checks");
return NS_ERROR_UNEXPECTED;
}
// if dealing with a redirected channel then we have already installed
// streamlistener and redirect proxies and so we are done.
if (loadInfo->GetInitialSecurityCheckDone()) {
return NS_OK;
}
// make sure that only one of the five security flags is set in the loadinfo
// e.g. do not require same origin and allow cross origin at the same time
nsresult rv = ValidateSecurityFlags(loadInfo);
NS_ENSURE_SUCCESS(rv, rv);
// since aChannel was openend using asyncOpen2() we have to make sure
// that redirects of that channel also get openend using asyncOpen2()
// please note that some implementations of ::AsyncOpen2 might already
// have set that flag to true (e.g. nsViewSourceChannel) in which case
// we just set the flag again.
rv = loadInfo->SetEnforceSecurity(true);
NS_ENSURE_SUCCESS(rv, rv);
if (loadInfo->GetSecurityMode() == nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) {
rv = DoCORSChecks(aChannel, loadInfo, aInAndOutListener);
NS_ENSURE_SUCCESS(rv, rv);
}
rv = CheckChannel(aChannel);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> finalChannelURI;
rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(finalChannelURI));
NS_ENSURE_SUCCESS(rv, rv);
// Perform all ContentPolicy checks (MixedContent, CSP, ...)
rv = DoContentSecurityChecks(finalChannelURI, loadInfo);
NS_ENSURE_SUCCESS(rv, rv);
// now lets set the initalSecurityFlag for subsequent calls
rv = loadInfo->SetInitialSecurityCheckDone(true);
NS_ENSURE_SUCCESS(rv, rv);
// all security checks passed - lets allow the load
return NS_OK;
}
NS_IMETHODIMP
nsContentSecurityManager::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
nsIChannel* aNewChannel,
uint32_t aRedirFlags,
nsIAsyncVerifyRedirectCallback *aCb)
{
nsCOMPtr<nsILoadInfo> loadInfo = aOldChannel->GetLoadInfo();
// Are we enforcing security using LoadInfo?
if (loadInfo && loadInfo->GetEnforceSecurity()) {
nsresult rv = CheckChannel(aNewChannel);
if (NS_FAILED(rv)) {
aOldChannel->Cancel(rv);
return rv;
}
}
// Also verify that the redirecting server is allowed to redirect to the
// given URI
nsCOMPtr<nsIPrincipal> oldPrincipal;
nsContentUtils::GetSecurityManager()->
GetChannelResultPrincipal(aOldChannel, getter_AddRefs(oldPrincipal));
nsCOMPtr<nsIURI> newURI;
aNewChannel->GetURI(getter_AddRefs(newURI));
nsCOMPtr<nsIURI> newOriginalURI;
aNewChannel->GetOriginalURI(getter_AddRefs(newOriginalURI));
NS_ENSURE_STATE(oldPrincipal && newURI && newOriginalURI);
const uint32_t flags =
nsIScriptSecurityManager::LOAD_IS_AUTOMATIC_DOCUMENT_REPLACEMENT |
nsIScriptSecurityManager::DISALLOW_SCRIPT;
nsresult rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(oldPrincipal, newURI, flags);
if (NS_SUCCEEDED(rv) && newOriginalURI != newURI) {
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(oldPrincipal, newOriginalURI, flags);
}
NS_ENSURE_SUCCESS(rv, rv);
aCb->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
static void
AddLoadFlags(nsIRequest *aRequest, nsLoadFlags aNewFlags)
{
nsLoadFlags flags;
aRequest->GetLoadFlags(&flags);
flags |= aNewFlags;
aRequest->SetLoadFlags(flags);
}
/*
* Check that this channel passes all security checks. Returns an error code
* if this requesst should not be permitted.
*/
nsresult
nsContentSecurityManager::CheckChannel(nsIChannel* aChannel)
{
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
MOZ_ASSERT(loadInfo);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
// Handle cookie policies
uint32_t cookiePolicy = loadInfo->GetCookiePolicy();
if (cookiePolicy == nsILoadInfo::SEC_COOKIES_SAME_ORIGIN) {
// We shouldn't have the SEC_COOKIES_SAME_ORIGIN flag for top level loads
MOZ_ASSERT(loadInfo->GetExternalContentPolicyType() !=
nsIContentPolicy::TYPE_DOCUMENT);
nsIPrincipal* loadingPrincipal = loadInfo->LoadingPrincipal();
// It doesn't matter what we pass for the third, data-inherits, argument.
// Any protocol which inherits won't pay attention to cookies anyway.
rv = loadingPrincipal->CheckMayLoad(uri, false, false);
if (NS_FAILED(rv)) {
AddLoadFlags(aChannel, nsIRequest::LOAD_ANONYMOUS);
}
}
else if (cookiePolicy == nsILoadInfo::SEC_COOKIES_OMIT) {
AddLoadFlags(aChannel, nsIRequest::LOAD_ANONYMOUS);
}
nsSecurityFlags securityMode = loadInfo->GetSecurityMode();
// CORS mode is handled by nsCORSListenerProxy
if (securityMode == nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) {
if (NS_HasBeenCrossOrigin(aChannel)) {
loadInfo->MaybeIncreaseTainting(LoadTainting::CORS);
}
return NS_OK;
}
// Allow subresource loads if TriggeringPrincipal is the SystemPrincipal.
// For example, allow user stylesheets to load XBL from external files.
if (nsContentUtils::IsSystemPrincipal(loadInfo->TriggeringPrincipal()) &&
loadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_DOCUMENT &&
loadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_SUBDOCUMENT) {
return NS_OK;
}
// if none of the REQUIRE_SAME_ORIGIN flags are set, then SOP does not apply
if ((securityMode == nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS) ||
(securityMode == nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED)) {
rv = DoSOPChecks(uri, loadInfo, aChannel);
NS_ENSURE_SUCCESS(rv, rv);
}
if ((securityMode == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS) ||
(securityMode == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL)) {
if (NS_HasBeenCrossOrigin(aChannel)) {
loadInfo->MaybeIncreaseTainting(LoadTainting::Opaque);
}
// Please note that DoCheckLoadURIChecks should only be enforced for
// cross origin requests. If the flag SEC_REQUIRE_CORS_DATA_INHERITS is set
// within the loadInfo, then then CheckLoadURIWithPrincipal is performed
// within nsCorsListenerProxy
rv = DoCheckLoadURIChecks(uri, loadInfo);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
// ==== nsIContentSecurityManager implementation =====
NS_IMETHODIMP
nsContentSecurityManager::PerformSecurityCheck(nsIChannel* aChannel,
nsIStreamListener* aStreamListener,
nsIStreamListener** outStreamListener)
{
nsCOMPtr<nsIStreamListener> inAndOutListener = aStreamListener;
nsresult rv = doContentSecurityCheck(aChannel, inAndOutListener);
NS_ENSURE_SUCCESS(rv, rv);
inAndOutListener.forget(outStreamListener);
return NS_OK;
}
NS_IMETHODIMP
nsContentSecurityManager::IsURIPotentiallyTrustworthy(nsIURI* aURI, bool* aIsTrustWorthy)
{
MOZ_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(aURI);
NS_ENSURE_ARG_POINTER(aIsTrustWorthy);
*aIsTrustWorthy = false;
nsAutoCString scheme;
nsresult rv = aURI->GetScheme(scheme);
if (NS_FAILED(rv)) {
return NS_OK;
}
// According to the specification, the user agent may choose to extend the
// trust to other, vendor-specific URL schemes. We use this for "resource:",
// which is technically a substituting protocol handler that is not limited to
// local resource mapping, but in practice is never mapped remotely as this
// would violate assumptions a lot of code makes.
if (scheme.EqualsLiteral("https") ||
scheme.EqualsLiteral("file") ||
scheme.EqualsLiteral("resource") ||
scheme.EqualsLiteral("app") ||
scheme.EqualsLiteral("wss")) {
*aIsTrustWorthy = true;
return NS_OK;
}
nsAutoCString host;
rv = aURI->GetHost(host);
if (NS_FAILED(rv)) {
return NS_OK;
}
if (host.Equals("127.0.0.1") ||
host.Equals("localhost") ||
host.Equals("::1")) {
*aIsTrustWorthy = true;
return NS_OK;
}
return NS_OK;
}
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