components/autofill/content/renderer/password_generation_agent.cc

   1 // Copyright 2013 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/autofill/content/renderer/password_generation_agent.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "components/autofill/content/common/autofill_messages.h"
  11 #include "components/autofill/content/renderer/form_autofill_util.h"
  12 #include "components/autofill/content/renderer/password_autofill_agent.h"
  13 #include "components/autofill/content/renderer/password_form_conversion_utils.h"
  14 #include "components/autofill/core/common/autofill_switches.h"
  15 #include "components/autofill/core/common/form_data.h"
  16 #include "components/autofill/core/common/password_form.h"
  17 #include "components/autofill/core/common/password_generation_util.h"
  18 #include "content/public/renderer/render_frame.h"
  19 #include "content/public/renderer/render_view.h"
  20 #include "google_apis/gaia/gaia_urls.h"
  21 #include "third_party/WebKit/public/platform/WebVector.h"
  22 #include "third_party/WebKit/public/web/WebDocument.h"
  23 #include "third_party/WebKit/public/web/WebFormElement.h"
  24 #include "third_party/WebKit/public/web/WebInputElement.h"
  25 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  26 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
  27 #include "third_party/WebKit/public/web/WebView.h"
  28 #include "ui/gfx/geometry/rect.h"
  29
  30 namespace autofill {
  31
  32 namespace {
  33
  34 // Returns true if we think that this form is for account creation. |passwords|
  35 // is filled with the password field(s) in the form.
  36 bool GetAccountCreationPasswordFields(
  37     const blink::WebFormElement& form,
  38     std::vector<blink::WebInputElement>* passwords) {
  39   // Grab all of the passwords for the form.
  40   blink::WebVector<blink::WebFormControlElement> control_elements;
  41   form.getFormControlElements(control_elements);
  42
  43   size_t num_input_elements = 0;
  44   for (size_t i = 0; i < control_elements.size(); i++) {
  45     blink::WebInputElement* input_element =
  46         toWebInputElement(&control_elements[i]);
  47     if (input_element && input_element->isTextField()) {
  48       num_input_elements++;
  49       if (input_element->isPasswordField())
  50         passwords->push_back(*input_element);
  51     }
  52   }
  53
  54   // This may be too lenient, but we assume that any form with at least three
  55   // input elements where at least one of them is a password is an account
  56   // creation form.
  57   if (!passwords->empty() && num_input_elements >= 3) {
  58     // We trim |passwords| because occasionally there are forms where the
  59     // security question answers are put in password fields and we don't want
  60     // to fill those.
  61     if (passwords->size() > 2)
  62       passwords->resize(2);
  63
  64     return true;
  65   }
  66
  67   return false;
  68 }
  69
  70 bool ContainsURL(const std::vector<GURL>& urls, const GURL& url) {
  71   return std::find(urls.begin(), urls.end(), url) != urls.end();
  72 }
  73
  74 bool ContainsForm(const std::vector<FormData>& forms,
  75                   const PasswordForm& form) {
  76   for (const auto& form_it : forms) {
  77     if (form_it.SameFormAs(form.form_data))
  78       return true;
  79   }
  80   return false;
  81 }
  82
  83 void CopyElementValueToOtherInputElements(
  84     const blink::WebInputElement* element,
  85     std::vector<blink::WebInputElement>* elements) {
  86   for (std::vector<blink::WebInputElement>::iterator it = elements->begin();
  87        it != elements->end(); ++it) {
  88     if (*element != *it) {
  89       it->setValue(element->value(), true /* sendEvents */);
  90     }
  91   }
  92 }
  93
  94 bool AutocompleteAttributesSetForGeneration(const PasswordForm& form) {
  95   return form.username_marked_by_site && form.new_password_marked_by_site;
  96 }
  97
  98 }  // namespace
  99
 100 PasswordGenerationAgent::AccountCreationFormData::AccountCreationFormData(
 101     linked_ptr<PasswordForm> password_form,
 102     std::vector<blink::WebInputElement> passwords)
 103     : form(password_form),
 104       password_elements(passwords) {}
 105
 106 PasswordGenerationAgent::AccountCreationFormData::~AccountCreationFormData() {}
 107
 108 PasswordGenerationAgent::PasswordGenerationAgent(
 109     content::RenderFrame* render_frame,
 110     PasswordAutofillAgent* password_agent)
 111     : content::RenderFrameObserver(render_frame),
 112       password_is_generated_(false),
 113       password_edited_(false),
 114       generation_popup_shown_(false),
 115       editing_popup_shown_(false),
 116       enabled_(password_generation::IsPasswordGenerationEnabled()),
 117       password_agent_(password_agent) {
 118   VLOG(2) << "Password Generation is " << (enabled_ ? "Enabled" : "Disabled");
 119 }
 120 PasswordGenerationAgent::~PasswordGenerationAgent() {}
 121
 122 void PasswordGenerationAgent::DidFinishDocumentLoad() {
 123   // Update stats for main frame navigation.
 124   if (!render_frame()->GetWebFrame()->parent()) {
 125     // In every navigation, the IPC message sent by the password autofill
 126     // manager to query whether the current form is blacklisted or not happens
 127     // when the document load finishes, so we need to clear previous states
 128     // here before we hear back from the browser. We only clear this state on
 129     // main frame load as we don't want subframe loads to clear state that we
 130     // have received from the main frame. Note that we assume there is only one
 131     // account creation form, but there could be multiple password forms in
 132     // each frame.
 133     not_blacklisted_password_form_origins_.clear();
 134     generation_enabled_forms_.clear();
 135     generation_element_.reset();
 136     possible_account_creation_forms_.clear();
 137
 138     // Log statistics after navigation so that we only log once per page.
 139     if (generation_form_data_ &&
 140         generation_form_data_->password_elements.empty()) {
 141       password_generation::LogPasswordGenerationEvent(
 142           password_generation::NO_SIGN_UP_DETECTED);
 143     } else {
 144       password_generation::LogPasswordGenerationEvent(
 145           password_generation::SIGN_UP_DETECTED);
 146     }
 147     generation_form_data_.reset();
 148     password_is_generated_ = false;
 149     if (password_edited_) {
 150       password_generation::LogPasswordGenerationEvent(
 151           password_generation::PASSWORD_EDITED);
 152     }
 153     password_edited_ = false;
 154
 155     if (generation_popup_shown_) {
 156       password_generation::LogPasswordGenerationEvent(
 157           password_generation::GENERATION_POPUP_SHOWN);
 158     }
 159     generation_popup_shown_ = false;
 160
 161     if (editing_popup_shown_) {
 162       password_generation::LogPasswordGenerationEvent(
 163           password_generation::EDITING_POPUP_SHOWN);
 164     }
 165     editing_popup_shown_ = false;
 166   }
 167
 168   FindPossibleGenerationForm();
 169 }
 170
 171 void PasswordGenerationAgent::OnDynamicFormsSeen() {
 172   FindPossibleGenerationForm();
 173 }
 174
 175 void PasswordGenerationAgent::FindPossibleGenerationForm() {
 176   if (!enabled_)
 177     return;
 178
 179   // We don't want to generate passwords if the browser won't store or sync
 180   // them.
 181   if (!ShouldAnalyzeDocument())
 182     return;
 183
 184   // If we have already found a signup form for this page, no need to continue.
 185   if (generation_form_data_)
 186     return;
 187
 188   blink::WebVector<blink::WebFormElement> forms;
 189   render_frame()->GetWebFrame()->document().forms(forms);
 190   for (size_t i = 0; i < forms.size(); ++i) {
 191     if (forms[i].isNull())
 192       continue;
 193
 194     // If we can't get a valid PasswordForm, we skip this form because the
 195     // the password won't get saved even if we generate it.
 196     scoped_ptr<PasswordForm> password_form(
 197         CreatePasswordFormFromWebForm(forms[i], nullptr, nullptr));
 198     if (!password_form.get()) {
 199       VLOG(2) << "Skipping form as it would not be saved";
 200       continue;
 201     }
 202
 203     // Do not generate password for GAIA since it is used to retrieve the
 204     // generated paswords.
 205     GURL realm(password_form->signon_realm);
 206     if (realm == GaiaUrls::GetInstance()->gaia_login_form_realm())
 207       continue;
 208
 209     std::vector<blink::WebInputElement> passwords;
 210     if (GetAccountCreationPasswordFields(forms[i], &passwords)) {
 211       AccountCreationFormData ac_form_data(
 212           make_linked_ptr(password_form.release()), passwords);
 213       possible_account_creation_forms_.push_back(ac_form_data);
 214     }
 215   }
 216
 217   if (!possible_account_creation_forms_.empty()) {
 218     VLOG(2) << possible_account_creation_forms_.size()
 219             << " possible account creation forms deteceted";
 220     DetermineGenerationElement();
 221   }
 222 }
 223
 224 bool PasswordGenerationAgent::ShouldAnalyzeDocument() const {
 225   // Make sure that this security origin is allowed to use password manager.
 226   // Generating a password that can't be saved is a bad idea.
 227   blink::WebSecurityOrigin origin =
 228       render_frame()->GetWebFrame()->document().securityOrigin();
 229   if (!origin.canAccessPasswordManager()) {
 230     VLOG(1) << "No PasswordManager access";
 231     return false;
 232   }
 233
 234   return true;
 235 }
 236
 237 bool PasswordGenerationAgent::OnMessageReceived(const IPC::Message& message) {
 238   bool handled = true;
 239   IPC_BEGIN_MESSAGE_MAP(PasswordGenerationAgent, message)
 240     IPC_MESSAGE_HANDLER(AutofillMsg_FormNotBlacklisted,
 241                         OnFormNotBlacklisted)
 242     IPC_MESSAGE_HANDLER(AutofillMsg_GeneratedPasswordAccepted,
 243                         OnPasswordAccepted)
 244     IPC_MESSAGE_HANDLER(AutofillMsg_AccountCreationFormsDetected,
 245                         OnAccountCreationFormsDetected)
 246     IPC_MESSAGE_UNHANDLED(handled = false)
 247   IPC_END_MESSAGE_MAP()
 248   return handled;
 249 }
 250
 251 void PasswordGenerationAgent::OnFormNotBlacklisted(const PasswordForm& form) {
 252   not_blacklisted_password_form_origins_.push_back(form.origin);
 253   DetermineGenerationElement();
 254 }
 255
 256 void PasswordGenerationAgent::OnPasswordAccepted(
 257     const base::string16& password) {
 258   password_is_generated_ = true;
 259   password_generation::LogPasswordGenerationEvent(
 260       password_generation::PASSWORD_ACCEPTED);
 261   for (auto& password_element : generation_form_data_->password_elements) {
 262     password_element.setValue(password, true /* sendEvents */);
 263     password_element.setAutofilled(true);
 264     // Needed to notify password_autofill_agent that the content of the field
 265     // has changed. Without this we will overwrite the generated
 266     // password with an Autofilled password when saving.
 267     // https://crbug.com/493455
 268     password_agent_->UpdateStateForTextChange(password_element);
 269     // Advance focus to the next input field. We assume password fields in
 270     // an account creation form are always adjacent.
 271     render_frame()->GetRenderView()->GetWebView()->advanceFocus(false);
 272   }
 273 }
 274
 275 void PasswordGenerationAgent::OnAccountCreationFormsDetected(
 276     const std::vector<FormData>& forms) {
 277   generation_enabled_forms_.insert(
 278       generation_enabled_forms_.end(), forms.begin(), forms.end());
 279   DetermineGenerationElement();
 280 }
 281
 282 void PasswordGenerationAgent::DetermineGenerationElement() {
 283   if (generation_form_data_) {
 284     VLOG(2) << "Account creation form already found";
 285     return;
 286   }
 287
 288   // Make sure local heuristics have identified a possible account creation
 289   // form.
 290   if (possible_account_creation_forms_.empty()) {
 291     VLOG(2) << "Local hueristics have not detected a possible account "
 292              << "creation form";
 293     return;
 294   }
 295
 296   // Note that no messages will be sent if this feature is disabled
 297   // (e.g. password saving is disabled).
 298   for (auto& possible_form_data : possible_account_creation_forms_) {
 299     PasswordForm* possible_password_form = possible_form_data.form.get();
 300     if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 301             switches::kLocalHeuristicsOnlyForPasswordGeneration)) {
 302       VLOG(2) << "Bypassing additional checks.";
 303     } else if (!ContainsURL(not_blacklisted_password_form_origins_,
 304                             possible_password_form->origin)) {
 305       VLOG(2) << "Have not received confirmation that password form isn't "
 306                << "blacklisted";
 307       continue;
 308     } else if (!ContainsForm(generation_enabled_forms_,
 309                              *possible_password_form)) {
 310       if (AutocompleteAttributesSetForGeneration(*possible_password_form)) {
 311         VLOG(2) << "Ignoring lack of Autofill signal due to Autocomplete "
 312                 << "attributes";
 313         password_generation::LogPasswordGenerationEvent(
 314             password_generation::AUTOCOMPLETE_ATTRIBUTES_ENABLED_GENERATION);
 315       } else {
 316         VLOG(2) << "Have not received confirmation from Autofill that form is "
 317                 << "used for account creation";
 318         continue;
 319       }
 320     }
 321
 322     VLOG(2) << "Password generation eligible form found";
 323     generation_form_data_.reset(
 324         new AccountCreationFormData(possible_form_data.form,
 325                                     possible_form_data.password_elements));
 326     generation_element_ = generation_form_data_->password_elements[0];
 327     generation_element_.setAttribute("aria-autocomplete", "list");
 328     password_generation::LogPasswordGenerationEvent(
 329         password_generation::GENERATION_AVAILABLE);
 330     possible_account_creation_forms_.clear();
 331     Send(new AutofillHostMsg_GenerationAvailableForForm(
 332         routing_id(),
 333         *generation_form_data_->form));
 334     return;
 335   }
 336 }
 337
 338 bool PasswordGenerationAgent::FocusedNodeHasChanged(
 339     const blink::WebNode& node) {
 340   if (!generation_element_.isNull())
 341     generation_element_.setShouldRevealPassword(false);
 342
 343   if (node.isNull() || !node.isElementNode())
 344     return false;
 345
 346   const blink::WebElement web_element = node.toConst<blink::WebElement>();
 347   if (!web_element.document().frame())
 348     return false;
 349
 350   const blink::WebInputElement* element = toWebInputElement(&web_element);
 351   if (!element || *element != generation_element_)
 352     return false;
 353
 354   if (password_is_generated_) {
 355     generation_element_.setShouldRevealPassword(true);
 356     ShowEditingPopup();
 357     return true;
 358   }
 359
 360   // Assume that if the password field has less than kMaximumOfferSize
 361   // characters then the user is not finished typing their password and display
 362   // the password suggestion.
 363   if (!element->isReadOnly() &&
 364       element->isEnabled() &&
 365       element->value().length() <= kMaximumOfferSize) {
 366     ShowGenerationPopup();
 367     return true;
 368   }
 369
 370   return false;
 371 }
 372
 373 bool PasswordGenerationAgent::TextDidChangeInTextField(
 374     const blink::WebInputElement& element) {
 375   if (element != generation_element_)
 376     return false;
 377
 378   if (element.value().isEmpty()) {
 379     if (password_is_generated_) {
 380       // User generated a password and then deleted it.
 381       password_generation::LogPasswordGenerationEvent(
 382           password_generation::PASSWORD_DELETED);
 383       CopyElementValueToOtherInputElements(&element,
 384           &generation_form_data_->password_elements);
 385       Send(new AutofillHostMsg_PasswordNoLongerGenerated(
 386           routing_id(),
 387           *generation_form_data_->form));
 388     }
 389
 390     // Do not treat the password as generated, either here or in the browser.
 391     password_is_generated_ = false;
 392     generation_element_.setShouldRevealPassword(false);
 393
 394     // Offer generation again.
 395     ShowGenerationPopup();
 396   } else if (password_is_generated_) {
 397     password_edited_ = true;
 398     // Mirror edits to any confirmation password fields.
 399     CopyElementValueToOtherInputElements(&element,
 400         &generation_form_data_->password_elements);
 401   } else if (element.value().length() > kMaximumOfferSize) {
 402     // User has rejected the feature and has started typing a password.
 403     HidePopup();
 404   } else {
 405     // Password isn't generated and there are fewer than kMaximumOfferSize
 406     // characters typed, so keep offering the password. Note this function
 407     // will just keep the previous popup if one is already showing.
 408     ShowGenerationPopup();
 409   }
 410
 411   return true;
 412 }
 413
 414 void PasswordGenerationAgent::ShowGenerationPopup() {
 415   gfx::RectF bounding_box_scaled = GetScaledBoundingBox(
 416       render_frame()->GetRenderView()->GetWebView()->pageScaleFactor(),
 417       &generation_element_);
 418
 419   Send(new AutofillHostMsg_ShowPasswordGenerationPopup(
 420       routing_id(),
 421       bounding_box_scaled,
 422       generation_element_.maxLength(),
 423       *generation_form_data_->form));
 424
 425   generation_popup_shown_ = true;
 426 }
 427
 428 void PasswordGenerationAgent::ShowEditingPopup() {
 429   gfx::RectF bounding_box_scaled = GetScaledBoundingBox(
 430       render_frame()->GetRenderView()->GetWebView()->pageScaleFactor(),
 431       &generation_element_);
 432
 433   Send(new AutofillHostMsg_ShowPasswordEditingPopup(
 434       routing_id(),
 435       bounding_box_scaled,
 436       *generation_form_data_->form));
 437
 438   editing_popup_shown_ = true;
 439 }
 440
 441 void PasswordGenerationAgent::HidePopup() {
 442   Send(new AutofillHostMsg_HidePasswordGenerationPopup(routing_id()));
 443 }
 444
 445 }  // namespace autofill