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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "SharedSSLState.h"
#include "nsClientAuthRemember.h"
#include "nsComponentManagerUtils.h"
#include "nsICertOverrideService.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "nsThreadUtils.h"
#include "nsCRT.h"
#include "nsServiceManagerUtils.h"
#include "PSMRunnable.h"
#include "PublicSSL.h"
#include "ssl.h"
#include "nsNetCID.h"
#include "mozilla/Atomics.h"
#include "mozilla/Unused.h"
using mozilla::psm::SyncRunnableBase;
using mozilla::Atomic;
using mozilla::Unused;
namespace {
static Atomic<bool> sCertOverrideSvcExists(false);
class MainThreadClearer : public SyncRunnableBase
{
public:
MainThreadClearer() : mShouldClearSessionCache(false) {}
void RunOnTargetThread() {
// In some cases it's possible to cause PSM/NSS to initialize while XPCOM shutdown
// is in progress. We want to avoid this, since they do not handle the situation well,
// hence the flags to avoid instantiating the services if they don't already exist.
bool certOverrideSvcExists = sCertOverrideSvcExists.exchange(false);
if (certOverrideSvcExists) {
sCertOverrideSvcExists = true;
nsCOMPtr<nsICertOverrideService> icos = do_GetService(NS_CERTOVERRIDE_CONTRACTID);
if (icos) {
icos->ClearValidityOverride(
NS_LITERAL_CSTRING("all:temporary-certificates"),
0);
}
}
// This needs to be checked on the main thread to avoid racing with NSS
// initialization.
mShouldClearSessionCache = mozilla::psm::PrivateSSLState() &&
mozilla::psm::PrivateSSLState()->SocketCreated();
}
bool mShouldClearSessionCache;
};
} // namespace
namespace mozilla {
void ClearPrivateSSLState()
{
// This only works if it is called on the socket transport
// service thread immediately after closing all private SSL
// connections.
#ifdef DEBUG
nsresult rv;
nsCOMPtr<nsIEventTarget> sts
= do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv);
MOZ_ASSERT(NS_SUCCEEDED(rv));
bool onSTSThread;
rv = sts->IsOnCurrentThread(&onSTSThread);
MOZ_ASSERT(NS_SUCCEEDED(rv) && onSTSThread);
#endif
RefPtr<MainThreadClearer> runnable = new MainThreadClearer;
runnable->DispatchToMainThreadAndWait();
// If NSS isn't initialized, this throws an assertion. We guard it by checking if
// the session cache might even have anything worth clearing.
if (runnable->mShouldClearSessionCache) {
SSL_ClearSessionCache();
}
}
namespace psm {
namespace {
class PrivateBrowsingObserver : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
explicit PrivateBrowsingObserver(SharedSSLState* aOwner) : mOwner(aOwner) {}
protected:
virtual ~PrivateBrowsingObserver() {}
private:
SharedSSLState* mOwner;
};
SharedSSLState* gPublicState;
SharedSSLState* gPrivateState;
} // namespace
NS_IMPL_ISUPPORTS(PrivateBrowsingObserver, nsIObserver)
NS_IMETHODIMP
PrivateBrowsingObserver::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *aData)
{
if (!nsCRT::strcmp(aTopic, "last-pb-context-exited")) {
mOwner->ResetStoredData();
}
return NS_OK;
}
SharedSSLState::SharedSSLState()
: mClientAuthRemember(new nsClientAuthRememberService)
, mMutex("SharedSSLState::mMutex")
, mSocketCreated(false)
, mOCSPStaplingEnabled(false)
, mOCSPMustStapleEnabled(false)
{
mIOLayerHelpers.Init();
mClientAuthRemember->Init();
}
SharedSSLState::~SharedSSLState()
{
}
void
SharedSSLState::NotePrivateBrowsingStatus()
{
MOZ_ASSERT(NS_IsMainThread(), "Not on main thread");
mObserver = new PrivateBrowsingObserver(this);
nsCOMPtr<nsIObserverService> obsSvc = mozilla::services::GetObserverService();
obsSvc->AddObserver(mObserver, "last-pb-context-exited", false);
}
void
SharedSSLState::ResetStoredData()
{
MOZ_ASSERT(NS_IsMainThread(), "Not on main thread");
mClientAuthRemember->ClearRememberedDecisions();
mIOLayerHelpers.clearStoredData();
}
void
SharedSSLState::NoteSocketCreated()
{
MutexAutoLock lock(mMutex);
mSocketCreated = true;
}
bool
SharedSSLState::SocketCreated()
{
MutexAutoLock lock(mMutex);
return mSocketCreated;
}
/*static*/ void
SharedSSLState::GlobalInit()
{
MOZ_ASSERT(NS_IsMainThread(), "Not on main thread");
gPublicState = new SharedSSLState();
gPrivateState = new SharedSSLState();
gPrivateState->NotePrivateBrowsingStatus();
}
/*static*/ void
SharedSSLState::GlobalCleanup()
{
MOZ_ASSERT(NS_IsMainThread(), "Not on main thread");
if (gPrivateState) {
gPrivateState->Cleanup();
delete gPrivateState;
gPrivateState = nullptr;
}
if (gPublicState) {
gPublicState->Cleanup();
delete gPublicState;
gPublicState = nullptr;
}
}
/*static*/ void
SharedSSLState::NoteCertOverrideServiceInstantiated()
{
sCertOverrideSvcExists = true;
}
void
SharedSSLState::Cleanup()
{
mIOLayerHelpers.Cleanup();
}
SharedSSLState*
PublicSSLState()
{
return gPublicState;
}
SharedSSLState*
PrivateSSLState()
{
return gPrivateState;
}
} // namespace psm
} // namespace mozilla
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