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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 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 "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::Atomic;
using mozilla::Unused;
using mozilla::psm::SyncRunnableBase;
namespace {
static Atomic<bool> sCertOverrideSvcExists(false);
class MainThreadClearer : public SyncRunnableBase {
public:
MainThreadClearer() : mShouldClearSessionCache(false) {}
void RunOnTargetThread() override {
// 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("all:temporary-certificates"_ns, 0,
OriginAttributes());
}
}
// 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) {
nsNSSComponent::DoClearSSLExternalAndInternalSessionCache();
}
}
namespace psm {
namespace {
class PrivateBrowsingObserver : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
explicit PrivateBrowsingObserver(SharedSSLState* aOwner) : mOwner(aOwner) {}
protected:
virtual ~PrivateBrowsingObserver() = default;
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(uint32_t aTlsFlags)
: mIOLayerHelpers(aTlsFlags),
mMutex("SharedSSLState::mMutex"),
mSocketCreated(false),
mOCSPStaplingEnabled(false),
mOCSPMustStapleEnabled(false),
mSignedCertTimestampsEnabled(false) {
mIOLayerHelpers.Init();
}
SharedSSLState::~SharedSSLState() = default;
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");
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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