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1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "components/os_crypt/keychain_password_mac.h"
6
7#import <Security/Security.h>
8
9#include "base/base64.h"
10#include "base/mac/mac_logging.h"
11#include "base/rand_util.h"
12#include "crypto/apple_keychain.h"
13
14using crypto::AppleKeychain;
15
16namespace {
17
18// Generates a random password and adds it to the Keychain.  The added password
19// is returned from the function.  If an error occurs, an empty password is
20// returned.
21std::string AddRandomPasswordToKeychain(const AppleKeychain& keychain,
22                                        const std::string& service_name,
23                                        const std::string& account_name) {
24  // Generate a password with 128 bits of randomness.
25  const int kBytes = 128 / 8;
26  std::string password;
27  base::Base64Encode(base::RandBytesAsString(kBytes), &password);
28  void* password_data =
29      const_cast<void*>(static_cast<const void*>(password.data()));
30
31  OSStatus error = keychain.AddGenericPassword(NULL,
32                                               service_name.size(),
33                                               service_name.data(),
34                                               account_name.size(),
35                                               account_name.data(),
36                                               password.size(),
37                                               password_data,
38                                               NULL);
39
40  if (error != noErr) {
41    OSSTATUS_DLOG(ERROR, error) << "Keychain add failed";
42    return std::string();
43  }
44
45  return password;
46}
47
48}  // namespace
49
50std::string KeychainPassword::GetPassword() const {
51  // These two strings ARE indeed user facing.  But they are used to access
52  // the encryption keyword.  So as to not lose encrypted data when system
53  // locale changes we DO NOT LOCALIZE.
54#if defined(OFFICIAL_BUILD)
55  const std::string service_name = "Chrome Safe Storage";
56  const std::string account_name = "Chrome";
57#else
58  const std::string service_name = "Chromium Safe Storage";
59  const std::string account_name = "Chromium";
60#endif
61
62  UInt32 password_length = 0;
63  void* password_data = NULL;
64  OSStatus error = keychain_.FindGenericPassword(NULL,
65                                                 service_name.size(),
66                                                 service_name.data(),
67                                                 account_name.size(),
68                                                 account_name.data(),
69                                                 &password_length,
70                                                 &password_data,
71                                                 NULL);
72
73  if (error == noErr) {
74    std::string password =
75        std::string(static_cast<char*>(password_data), password_length);
76    keychain_.ItemFreeContent(NULL, password_data);
77    return password;
78  } else if (error == errSecItemNotFound) {
79    return AddRandomPasswordToKeychain(keychain_, service_name, account_name);
80  } else {
81    OSSTATUS_DLOG(ERROR, error) << "Keychain lookup failed";
82    return std::string();
83  }
84}
85