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// 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(GOOGLE_CHROME_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();
}
}
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