password_store_x.cc revision cedac228d2dd51db4b79ea1e72c7f249408ee061 
1// Copyright (c) 2012 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 "chrome/browser/password_manager/password_store_x.h"
6
7#include <algorithm>
8#include <map>
9#include <vector>
10
11#include "base/bind.h"
12#include "base/logging.h"
13#include "base/prefs/pref_service.h"
14#include "base/stl_util.h"
15#include "chrome/browser/chrome_notification_types.h"
16#include "components/password_manager/core/browser/password_store_change.h"
17#include "components/password_manager/core/common/password_manager_pref_names.h"
18#include "components/pref_registry/pref_registry_syncable.h"
19#include "content/public/browser/browser_thread.h"
20#include "content/public/browser/notification_service.h"
21
22using autofill::PasswordForm;
23using content::BrowserThread;
24using password_manager::PasswordStoreChange;
25using password_manager::PasswordStoreChangeList;
26using password_manager::PasswordStoreDefault;
27using std::vector;
28
29namespace {
30
31bool AddLoginToBackend(const scoped_ptr<PasswordStoreX::NativeBackend>& backend,
32                       const PasswordForm& form,
33                       PasswordStoreChangeList* changes) {
34  *changes = backend->AddLogin(form);
35  return (!changes->empty() &&
36          changes->back().type() == PasswordStoreChange::ADD);
37}
38
39}  // namespace
40
41PasswordStoreX::PasswordStoreX(
42    scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner,
43    scoped_refptr<base::SingleThreadTaskRunner> db_thread_runner,
44    password_manager::LoginDatabase* login_db,
45    NativeBackend* backend)
46    : PasswordStoreDefault(main_thread_runner, db_thread_runner, login_db),
47      backend_(backend),
48      migration_checked_(!backend),
49      allow_fallback_(false) {}
50
51PasswordStoreX::~PasswordStoreX() {}
52
53PasswordStoreChangeList PasswordStoreX::AddLoginImpl(const PasswordForm& form) {
54  CheckMigration();
55  PasswordStoreChangeList changes;
56  if (use_native_backend() && AddLoginToBackend(backend_, form, &changes)) {
57    allow_fallback_ = false;
58  } else if (allow_default_store()) {
59    changes = PasswordStoreDefault::AddLoginImpl(form);
60  }
61  return changes;
62}
63
64PasswordStoreChangeList PasswordStoreX::UpdateLoginImpl(
65    const PasswordForm& form) {
66  CheckMigration();
67  PasswordStoreChangeList changes;
68  if (use_native_backend() && backend_->UpdateLogin(form, &changes)) {
69    allow_fallback_ = false;
70  } else if (allow_default_store()) {
71    changes = PasswordStoreDefault::UpdateLoginImpl(form);
72  }
73  return changes;
74}
75
76PasswordStoreChangeList PasswordStoreX::RemoveLoginImpl(
77    const PasswordForm& form) {
78  CheckMigration();
79  PasswordStoreChangeList changes;
80  if (use_native_backend() && backend_->RemoveLogin(form)) {
81    changes.push_back(PasswordStoreChange(PasswordStoreChange::REMOVE, form));
82    allow_fallback_ = false;
83  } else if (allow_default_store()) {
84    changes = PasswordStoreDefault::RemoveLoginImpl(form);
85  }
86  return changes;
87}
88
89PasswordStoreChangeList PasswordStoreX::RemoveLoginsCreatedBetweenImpl(
90    const base::Time& delete_begin,
91    const base::Time& delete_end) {
92  CheckMigration();
93  vector<PasswordForm*> forms;
94  PasswordStoreChangeList changes;
95  if (use_native_backend() &&
96      backend_->GetLoginsCreatedBetween(delete_begin, delete_end, &forms) &&
97      backend_->RemoveLoginsCreatedBetween(delete_begin, delete_end)) {
98    for (vector<PasswordForm*>::const_iterator it = forms.begin();
99         it != forms.end(); ++it) {
100      changes.push_back(PasswordStoreChange(PasswordStoreChange::REMOVE,
101                                            **it));
102    }
103    LogStatsForBulkDeletion(changes.size());
104    allow_fallback_ = false;
105  } else if (allow_default_store()) {
106    changes = PasswordStoreDefault::RemoveLoginsCreatedBetweenImpl(delete_begin,
107                                                                   delete_end);
108  }
109  STLDeleteElements(&forms);
110  return changes;
111}
112
113namespace {
114struct LoginLessThan {
115  bool operator()(const PasswordForm* a, const PasswordForm* b) {
116    return a->origin < b->origin;
117  }
118};
119}  // anonymous namespace
120
121void PasswordStoreX::SortLoginsByOrigin(NativeBackend::PasswordFormList* list) {
122  // In login_database.cc, the query has ORDER BY origin_url. Simulate that.
123  std::sort(list->begin(), list->end(), LoginLessThan());
124}
125
126void PasswordStoreX::GetLoginsImpl(
127    const autofill::PasswordForm& form,
128    AuthorizationPromptPolicy prompt_policy,
129    const ConsumerCallbackRunner& callback_runner) {
130  CheckMigration();
131  std::vector<autofill::PasswordForm*> matched_forms;
132  if (use_native_backend() && backend_->GetLogins(form, &matched_forms)) {
133    SortLoginsByOrigin(&matched_forms);
134    // The native backend may succeed and return no data even while locked, if
135    // the query did not match anything stored. So we continue to allow fallback
136    // until we perform a write operation, or until a read returns actual data.
137    if (matched_forms.size() > 0)
138      allow_fallback_ = false;
139  } else if (allow_default_store()) {
140    DCHECK(matched_forms.empty());
141    PasswordStoreDefault::GetLoginsImpl(form, prompt_policy, callback_runner);
142    return;
143  }
144  // The consumer will be left hanging unless we reply.
145  callback_runner.Run(matched_forms);
146}
147
148void PasswordStoreX::GetAutofillableLoginsImpl(GetLoginsRequest* request) {
149  CheckMigration();
150  if (use_native_backend() &&
151      backend_->GetAutofillableLogins(request->result())) {
152    SortLoginsByOrigin(request->result());
153    // See GetLoginsImpl() for why we disallow fallback conditionally here.
154    if (request->result()->size() > 0)
155      allow_fallback_ = false;
156  } else if (allow_default_store()) {
157    PasswordStoreDefault::GetAutofillableLoginsImpl(request);
158    return;
159  }
160  // The consumer will be left hanging unless we reply.
161  ForwardLoginsResult(request);
162}
163
164void PasswordStoreX::GetBlacklistLoginsImpl(GetLoginsRequest* request) {
165  CheckMigration();
166  if (use_native_backend() &&
167      backend_->GetBlacklistLogins(request->result())) {
168    SortLoginsByOrigin(request->result());
169    // See GetLoginsImpl() for why we disallow fallback conditionally here.
170    if (request->result()->size() > 0)
171      allow_fallback_ = false;
172  } else if (allow_default_store()) {
173    PasswordStoreDefault::GetBlacklistLoginsImpl(request);
174    return;
175  }
176  // The consumer will be left hanging unless we reply.
177  ForwardLoginsResult(request);
178}
179
180bool PasswordStoreX::FillAutofillableLogins(vector<PasswordForm*>* forms) {
181  CheckMigration();
182  if (use_native_backend() && backend_->GetAutofillableLogins(forms)) {
183    // See GetLoginsImpl() for why we disallow fallback conditionally here.
184    if (forms->size() > 0)
185      allow_fallback_ = false;
186    return true;
187  }
188  if (allow_default_store())
189    return PasswordStoreDefault::FillAutofillableLogins(forms);
190  return false;
191}
192
193bool PasswordStoreX::FillBlacklistLogins(vector<PasswordForm*>* forms) {
194  CheckMigration();
195  if (use_native_backend() && backend_->GetBlacklistLogins(forms)) {
196    // See GetLoginsImpl() for why we disallow fallback conditionally here.
197    if (forms->size() > 0)
198      allow_fallback_ = false;
199    return true;
200  }
201  if (allow_default_store())
202    return PasswordStoreDefault::FillBlacklistLogins(forms);
203  return false;
204}
205
206void PasswordStoreX::CheckMigration() {
207  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
208  if (migration_checked_ || !backend_.get())
209    return;
210  migration_checked_ = true;
211  ssize_t migrated = MigrateLogins();
212  if (migrated > 0) {
213    VLOG(1) << "Migrated " << migrated << " passwords to native store.";
214  } else if (migrated == 0) {
215    // As long as we are able to migrate some passwords, we know the native
216    // store is working. But if there is nothing to migrate, the "migration"
217    // can succeed even when the native store would fail. In this case we
218    // allow a later fallback to the default store. Once any later operation
219    // succeeds on the native store, we will no longer allow fallback.
220    allow_fallback_ = true;
221  } else {
222    LOG(WARNING) << "Native password store migration failed! " <<
223                 "Falling back on default (unencrypted) store.";
224    backend_.reset(NULL);
225  }
226}
227
228bool PasswordStoreX::allow_default_store() {
229  if (allow_fallback_) {
230    LOG(WARNING) << "Native password store failed! " <<
231                 "Falling back on default (unencrypted) store.";
232    backend_.reset(NULL);
233    // Don't warn again. We'll use the default store because backend_ is NULL.
234    allow_fallback_ = false;
235  }
236  return !backend_.get();
237}
238
239ssize_t PasswordStoreX::MigrateLogins() {
240  DCHECK(backend_.get());
241  vector<PasswordForm*> forms;
242  bool ok = PasswordStoreDefault::FillAutofillableLogins(&forms) &&
243      PasswordStoreDefault::FillBlacklistLogins(&forms);
244  if (ok) {
245    // We add all the passwords (and blacklist entries) to the native backend
246    // before attempting to remove any from the login database, to make sure we
247    // don't somehow end up with some of the passwords in one store and some in
248    // another. We'll always have at least one intact store this way.
249    for (size_t i = 0; i < forms.size(); ++i) {
250      PasswordStoreChangeList changes;
251      if (!AddLoginToBackend(backend_, *forms[i], &changes)) {
252        ok = false;
253        break;
254      }
255    }
256    if (ok) {
257      for (size_t i = 0; i < forms.size(); ++i) {
258        // If even one of these calls to RemoveLoginImpl() succeeds, then we
259        // should prefer the native backend to the now-incomplete login
260        // database. Thus we want to return a success status even in the case
261        // where some fail. The only real problem with this is that we might
262        // leave passwords in the login database and never come back to clean
263        // them out if any of these calls do fail.
264        PasswordStoreDefault::RemoveLoginImpl(*forms[i]);
265      }
266      // Finally, delete the database file itself. We remove the passwords from
267      // it before deleting the file just in case there is some problem deleting
268      // the file (e.g. directory is not writable, but file is), which would
269      // otherwise cause passwords to re-migrate next (or maybe every) time.
270      DeleteAndRecreateDatabaseFile();
271    }
272  }
273  ssize_t result = ok ? forms.size() : -1;
274  STLDeleteElements(&forms);
275  return result;
276}
277