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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 "NSSKeyStore.h"
#include "mozilla/AbstractThread.h"
#include "mozilla/Base64.h"
#include "mozilla/Logging.h"
#include "mozilla/SyncRunnable.h"
#include "nsIThread.h"
#include "nsNSSComponent.h"
#include "nsPK11TokenDB.h"
#include "nsXULAppAPI.h"
/* Implementing OSKeyStore when there is no platform specific one.
* This key store instead puts the keys into the NSS DB.
*/
using namespace mozilla;
using mozilla::SyncRunnable;
LazyLogModule gNSSKeyStoreLog("nsskeystore");
NSSKeyStore::NSSKeyStore() {
MOZ_ASSERT(XRE_IsParentProcess());
if (!XRE_IsParentProcess()) {
// This shouldn't happen as this is only initialised when creating the
// OSKeyStore, which is ParentProcessOnly.
return;
}
Unused << EnsureNSSInitializedChromeOrContent();
Unused << InitToken();
}
NSSKeyStore::~NSSKeyStore() = default;
nsresult NSSKeyStore::InitToken() {
if (!mSlot) {
mSlot = UniquePK11SlotInfo(PK11_GetInternalKeySlot());
if (!mSlot) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug,
("Error getting internal key slot"));
return NS_ERROR_NOT_AVAILABLE;
}
}
return NS_OK;
}
nsresult NSSKeyStoreMainThreadLock(PK11SlotInfo* aSlot) {
nsCOMPtr<nsIPK11Token> token = new nsPK11Token(aSlot);
return token->LogoutSimple();
}
nsresult NSSKeyStore::Lock() {
NS_ENSURE_STATE(mSlot);
if (!NS_IsMainThread()) {
nsCOMPtr<nsIThread> mainThread;
nsresult rv = NS_GetMainThread(getter_AddRefs(mainThread));
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
// Forward to the main thread synchronously.
SyncRunnable::DispatchToThread(
mainThread, NS_NewRunnableFunction("NSSKeyStoreMainThreadLock",
[slot = mSlot.get()]() {
NSSKeyStoreMainThreadLock(slot);
}));
return NS_OK;
}
return NSSKeyStoreMainThreadLock(mSlot.get());
}
nsresult NSSKeyStoreMainThreadUnlock(PK11SlotInfo* aSlot) {
nsCOMPtr<nsIPK11Token> token = new nsPK11Token(aSlot);
return NS_FAILED(token->Login(false /* force */)) ? NS_ERROR_FAILURE : NS_OK;
}
nsresult NSSKeyStore::Unlock() {
NS_ENSURE_STATE(mSlot);
if (!NS_IsMainThread()) {
nsCOMPtr<nsIThread> mainThread;
nsresult rv = NS_GetMainThread(getter_AddRefs(mainThread));
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
// Forward to the main thread synchronously.
nsresult result = NS_ERROR_FAILURE;
SyncRunnable::DispatchToThread(
mainThread,
NS_NewRunnableFunction("NSSKeyStoreMainThreadUnlock",
[slot = mSlot.get(), result = &result]() {
*result = NSSKeyStoreMainThreadUnlock(slot);
}));
return result;
}
return NSSKeyStoreMainThreadUnlock(mSlot.get());
}
nsresult NSSKeyStore::StoreSecret(const nsACString& aSecret,
const nsACString& aLabel) {
NS_ENSURE_STATE(mSlot);
if (NS_FAILED(Unlock())) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error unlocking NSS key db"));
return NS_ERROR_FAILURE;
}
// It is possible for multiple keys to have the same nickname in NSS. To
// prevent the problem of not knowing which key to use in the future, simply
// delete all keys with this nickname before storing a new one.
nsresult rv = DeleteSecret(aLabel);
if (NS_FAILED(rv)) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug,
("DeleteSecret before StoreSecret failed"));
return rv;
}
uint8_t* p = BitwiseCast<uint8_t*, const char*>(aSecret.BeginReading());
UniqueSECItem key(SECITEM_AllocItem(nullptr, nullptr, aSecret.Length()));
if (!key) {
return NS_ERROR_OUT_OF_MEMORY;
}
key->type = siBuffer;
memcpy(key->data, p, aSecret.Length());
key->len = aSecret.Length();
UniquePK11SymKey symKey(
PK11_ImportSymKey(mSlot.get(), CKM_AES_GCM, PK11_OriginUnwrap,
CKA_DECRYPT | CKA_ENCRYPT, key.get(), nullptr));
if (!symKey) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error creating NSS SymKey"));
return NS_ERROR_FAILURE;
}
UniquePK11SymKey storedKey(
PK11_ConvertSessionSymKeyToTokenSymKey(symKey.get(), nullptr));
if (!storedKey) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug,
("Error storing NSS SymKey in DB"));
return NS_ERROR_FAILURE;
}
SECStatus srv =
PK11_SetSymKeyNickname(storedKey.get(), PromiseFlatCString(aLabel).get());
if (srv != SECSuccess) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error naming NSS SymKey"));
(void)PK11_DeleteTokenSymKey(storedKey.get());
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult NSSKeyStore::DeleteSecret(const nsACString& aLabel) {
NS_ENSURE_STATE(mSlot);
if (NS_FAILED(Unlock())) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error unlocking NSS key db"));
return NS_ERROR_FAILURE;
}
UniquePK11SymKey symKey(PK11_ListFixedKeysInSlot(
mSlot.get(), const_cast<char*>(PromiseFlatCString(aLabel).get()),
nullptr));
if (!symKey) {
// Couldn't find the key or something is wrong. Be nice.
return NS_OK;
}
for (PK11SymKey* tmp = symKey.get(); tmp; tmp = PK11_GetNextSymKey(tmp)) {
SECStatus srv = PK11_DeleteTokenSymKey(tmp);
if (srv != SECSuccess) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error deleting NSS SymKey"));
return NS_ERROR_FAILURE;
}
}
return NS_OK;
}
bool NSSKeyStore::SecretAvailable(const nsACString& aLabel) {
if (!mSlot) {
return false;
}
if (NS_FAILED(Unlock())) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error unlocking NSS key db"));
return false;
}
UniquePK11SymKey symKey(PK11_ListFixedKeysInSlot(
mSlot.get(), const_cast<char*>(PromiseFlatCString(aLabel).get()),
nullptr));
if (!symKey) {
return false;
}
return true;
}
nsresult NSSKeyStore::EncryptDecrypt(const nsACString& aLabel,
const std::vector<uint8_t>& inBytes,
std::vector<uint8_t>& outBytes,
bool encrypt) {
NS_ENSURE_STATE(mSlot);
if (NS_FAILED(Unlock())) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug, ("Error unlocking NSS key db"));
return NS_ERROR_FAILURE;
}
UniquePK11SymKey symKey(PK11_ListFixedKeysInSlot(
mSlot.get(), const_cast<char*>(PromiseFlatCString(aLabel).get()),
nullptr));
if (!symKey) {
MOZ_LOG(gNSSKeyStoreLog, LogLevel::Debug,
("Error finding key for given label"));
return NS_ERROR_FAILURE;
}
return DoCipher(symKey, inBytes, outBytes, encrypt);
}
// Because NSSKeyStore overrides AbstractOSKeyStore's EncryptDecrypt and
// SecretAvailable functions, this isn't necessary.
nsresult NSSKeyStore::RetrieveSecret(const nsACString& aLabel,
/* out */ nsACString& aSecret) {
return NS_ERROR_NOT_IMPLEMENTED;
}
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