| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/os_crypt/keychain_password_mac.h" |
| |
| #import <Security/Security.h> |
| |
| #include "base/base64.h" |
| #include "base/mac/mac_logging.h" |
| #include "base/rand_util.h" |
| #include "crypto/apple_keychain.h" |
| |
| using crypto::AppleKeychain; |
| |
| namespace { |
| |
| // Generates a random password and adds it to the Keychain. The added password |
| // is returned from the function. If an error occurs, an empty password is |
| // returned. |
| std::string AddRandomPasswordToKeychain(const AppleKeychain& keychain, |
| const std::string& service_name, |
| const std::string& account_name) { |
| // Generate a password with 128 bits of randomness. |
| const int kBytes = 128 / 8; |
| std::string password; |
| base::Base64Encode(base::RandBytesAsString(kBytes), &password); |
| void* password_data = |
| const_cast<void*>(static_cast<const void*>(password.data())); |
| |
| OSStatus error = keychain.AddGenericPassword(NULL, |
| service_name.size(), |
| service_name.data(), |
| account_name.size(), |
| account_name.data(), |
| password.size(), |
| password_data, |
| NULL); |
| |
| if (error != noErr) { |
| OSSTATUS_DLOG(ERROR, error) << "Keychain add failed"; |
| return std::string(); |
| } |
| |
| return password; |
| } |
| |
| } // namespace |
| |
| std::string KeychainPassword::GetPassword() const { |
| // These two strings ARE indeed user facing. But they are used to access |
| // the encryption keyword. So as to not lose encrypted data when system |
| // locale changes we DO NOT LOCALIZE. |
| #if defined(OFFICIAL_BUILD) |
| const std::string service_name = "Chrome Safe Storage"; |
| const std::string account_name = "Chrome"; |
| #else |
| const std::string service_name = "Chromium Safe Storage"; |
| const std::string account_name = "Chromium"; |
| #endif |
| |
| UInt32 password_length = 0; |
| void* password_data = NULL; |
| OSStatus error = keychain_.FindGenericPassword(NULL, |
| service_name.size(), |
| service_name.data(), |
| account_name.size(), |
| account_name.data(), |
| &password_length, |
| &password_data, |
| NULL); |
| |
| if (error == noErr) { |
| std::string password = |
| std::string(static_cast<char*>(password_data), password_length); |
| keychain_.ItemFreeContent(NULL, password_data); |
| return password; |
| } else if (error == errSecItemNotFound) { |
| return AddRandomPasswordToKeychain(keychain_, service_name, account_name); |
| } else { |
| OSSTATUS_DLOG(ERROR, error) << "Keychain lookup failed"; |
| return std::string(); |
| } |
| } |