forked from electron/electron
/
electron_api_safe_storage.cc
138 lines (116 loc) · 4.34 KB
/
electron_api_safe_storage.cc
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// Copyright (c) 2021 Slack Technologies, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/browser/api/electron_api_safe_storage.h"
#include <string>
#include <vector>
#include "components/os_crypt/os_crypt.h"
#include "shell/browser/browser.h"
#include "shell/common/gin_converters/base_converter.h"
#include "shell/common/gin_converters/callback_converter.h"
#include "shell/common/gin_helper/dictionary.h"
#include "shell/common/node_includes.h"
#include "shell/common/platform_util.h"
namespace electron {
namespace safestorage {
static const char* kEncryptionVersionPrefixV10 = "v10";
static const char* kEncryptionVersionPrefixV11 = "v11";
#if DCHECK_IS_ON()
static bool electron_crypto_ready = false;
void SetElectronCryptoReady(bool ready) {
electron_crypto_ready = ready;
}
#endif
bool IsEncryptionAvailable() {
#if defined(OS_LINUX)
// Calling IsEncryptionAvailable() before the app is ready results in a crash
// on Linux.
// Refs: https://github.com/electron/electron/issues/32206.
if (!Browser::Get()->is_ready())
return false;
#endif
return OSCrypt::IsEncryptionAvailable();
}
v8::Local<v8::Value> EncryptString(v8::Isolate* isolate,
const std::string& plaintext) {
if (!IsEncryptionAvailable()) {
if (!Browser::Get()->is_ready()) {
gin_helper::ErrorThrower(isolate).ThrowError(
"safeStorage cannot be used before app is ready");
return v8::Local<v8::Value>();
}
gin_helper::ErrorThrower(isolate).ThrowError(
"Error while decrypting the ciphertext provided to "
"safeStorage.decryptString. "
"Encryption is not available.");
return v8::Local<v8::Value>();
}
std::string ciphertext;
bool encrypted = OSCrypt::EncryptString(plaintext, &ciphertext);
if (!encrypted) {
gin_helper::ErrorThrower(isolate).ThrowError(
"Error while encrypting the text provided to "
"safeStorage.encryptString.");
return v8::Local<v8::Value>();
}
return node::Buffer::Copy(isolate, ciphertext.c_str(), ciphertext.size())
.ToLocalChecked();
}
std::string DecryptString(v8::Isolate* isolate, v8::Local<v8::Value> buffer) {
if (!IsEncryptionAvailable()) {
if (!Browser::Get()->is_ready()) {
gin_helper::ErrorThrower(isolate).ThrowError(
"safeStorage cannot be used before app is ready");
return "";
}
gin_helper::ErrorThrower(isolate).ThrowError(
"Error while decrypting the ciphertext provided to "
"safeStorage.decryptString. "
"Decryption is not available.");
return "";
}
if (!node::Buffer::HasInstance(buffer)) {
gin_helper::ErrorThrower(isolate).ThrowError(
"Expected the first argument of decryptString() to be a buffer");
return "";
}
// ensures an error is thrown in Mac or Linux on
// decryption failure, rather than failing silently
const char* data = node::Buffer::Data(buffer);
auto size = node::Buffer::Length(buffer);
std::string ciphertext(data, size);
if (ciphertext.empty()) {
return "";
}
if (ciphertext.find(kEncryptionVersionPrefixV10) != 0 &&
ciphertext.find(kEncryptionVersionPrefixV11) != 0) {
gin_helper::ErrorThrower(isolate).ThrowError(
"Error while decrypting the ciphertext provided to "
"safeStorage.decryptString. "
"Ciphertext does not appear to be encrypted.");
return "";
}
std::string plaintext;
bool decrypted = OSCrypt::DecryptString(ciphertext, &plaintext);
if (!decrypted) {
gin_helper::ErrorThrower(isolate).ThrowError(
"Error while decrypting the ciphertext provided to "
"safeStorage.decryptString.");
return "";
}
return plaintext;
}
} // namespace safestorage
} // namespace electron
void Initialize(v8::Local<v8::Object> exports,
v8::Local<v8::Value> unused,
v8::Local<v8::Context> context,
void* priv) {
v8::Isolate* isolate = context->GetIsolate();
gin_helper::Dictionary dict(isolate, exports);
dict.SetMethod("isEncryptionAvailable",
&electron::safestorage::IsEncryptionAvailable);
dict.SetMethod("encryptString", &electron::safestorage::EncryptString);
dict.SetMethod("decryptString", &electron::safestorage::DecryptString);
}
NODE_LINKED_MODULE_CONTEXT_AWARE(electron_browser_safe_storage, Initialize)