extensions/common/permissions/permissions_data.cc

   1 // Copyright (c) 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 "extensions/common/permissions/permissions_data.h"
   6
   7 #include "base/command_line.h"
   8 #include "content/public/common/url_constants.h"
   9 #include "extensions/common/constants.h"
  10 #include "extensions/common/error_utils.h"
  11 #include "extensions/common/extension.h"
  12 #include "extensions/common/extensions_client.h"
  13 #include "extensions/common/manifest.h"
  14 #include "extensions/common/manifest_constants.h"
  15 #include "extensions/common/manifest_handlers/permissions_parser.h"
  16 #include "extensions/common/permissions/permission_message_util.h"
  17 #include "extensions/common/switches.h"
  18 #include "extensions/common/url_pattern_set.h"
  19 #include "url/gurl.h"
  20 #include "url/url_constants.h"
  21
  22 namespace extensions {
  23
  24 namespace {
  25
  26 PermissionsData::PolicyDelegate* g_policy_delegate = NULL;
  27
  28 }  // namespace
  29
  30 PermissionsData::PermissionsData(const Extension* extension)
  31     : extension_id_(extension->id()), manifest_type_(extension->GetType()) {
  32   base::AutoLock auto_lock(runtime_lock_);
  33   scoped_refptr<const PermissionSet> required_permissions =
  34       PermissionsParser::GetRequiredPermissions(extension);
  35   active_permissions_unsafe_ =
  36       new PermissionSet(required_permissions->apis(),
  37                         required_permissions->manifest_permissions(),
  38                         required_permissions->explicit_hosts(),
  39                         required_permissions->scriptable_hosts());
  40   withheld_permissions_unsafe_ = new PermissionSet();
  41 }
  42
  43 PermissionsData::~PermissionsData() {
  44 }
  45
  46 // static
  47 void PermissionsData::SetPolicyDelegate(PolicyDelegate* delegate) {
  48   g_policy_delegate = delegate;
  49 }
  50
  51 // static
  52 bool PermissionsData::CanExecuteScriptEverywhere(const Extension* extension) {
  53   if (extension->location() == Manifest::COMPONENT)
  54     return true;
  55
  56   const ExtensionsClient::ScriptingWhitelist& whitelist =
  57       ExtensionsClient::Get()->GetScriptingWhitelist();
  58
  59   return std::find(whitelist.begin(), whitelist.end(), extension->id()) !=
  60          whitelist.end();
  61 }
  62
  63 // static
  64 bool PermissionsData::ScriptsMayRequireActionForExtension(
  65     const Extension* extension,
  66     const PermissionSet* permissions) {
  67   // An extension may require user action to execute scripts iff the extension
  68   // shows up in chrome:extensions (so the user can grant withheld permissions),
  69   // is not part of chrome or corporate policy, not on the scripting whitelist,
  70   // and requires enough permissions that we should withhold them.
  71   return extension->ShouldDisplayInExtensionSettings() &&
  72       !Manifest::IsPolicyLocation(extension->location()) &&
  73       !Manifest::IsComponentLocation(extension->location()) &&
  74       !CanExecuteScriptEverywhere(extension) &&
  75       permissions->ShouldWarnAllHosts();
  76 }
  77
  78 bool PermissionsData::ShouldSkipPermissionWarnings(
  79     const std::string& extension_id) {
  80   // See http://b/4946060 for more details.
  81   return extension_id == std::string("nckgahadagoaajjgafhacjanaoiihapd");
  82 }
  83
  84 // static
  85 bool PermissionsData::IsRestrictedUrl(const GURL& document_url,
  86                                       const GURL& top_frame_url,
  87                                       const Extension* extension,
  88                                       std::string* error) {
  89   if (extension && CanExecuteScriptEverywhere(extension))
  90     return false;
  91
  92   // Check if the scheme is valid for extensions. If not, return.
  93   if (!URLPattern::IsValidSchemeForExtensions(document_url.scheme()) &&
  94       document_url.spec() != url::kAboutBlankURL) {
  95     if (error) {
  96       *error = ErrorUtils::FormatErrorMessage(
  97                    manifest_errors::kCannotAccessPage,
  98                    document_url.spec());
  99     }
 100     return true;
 101   }
 102
 103   if (!ExtensionsClient::Get()->IsScriptableURL(document_url, error))
 104     return true;
 105
 106   bool allow_on_chrome_urls = base::CommandLine::ForCurrentProcess()->HasSwitch(
 107                                   switches::kExtensionsOnChromeURLs);
 108   if (document_url.SchemeIs(content::kChromeUIScheme) &&
 109       !allow_on_chrome_urls) {
 110     if (error)
 111       *error = manifest_errors::kCannotAccessChromeUrl;
 112     return true;
 113   }
 114
 115   if (extension && top_frame_url.SchemeIs(kExtensionScheme) &&
 116       top_frame_url.host() != extension->id() && !allow_on_chrome_urls) {
 117     if (error)
 118       *error = manifest_errors::kCannotAccessExtensionUrl;
 119     return true;
 120   }
 121
 122   return false;
 123 }
 124
 125 void PermissionsData::SetPermissions(
 126     const scoped_refptr<const PermissionSet>& active,
 127     const scoped_refptr<const PermissionSet>& withheld) const {
 128   base::AutoLock auto_lock(runtime_lock_);
 129   active_permissions_unsafe_ = active;
 130   withheld_permissions_unsafe_ = withheld;
 131 }
 132
 133 void PermissionsData::UpdateTabSpecificPermissions(
 134     int tab_id,
 135     scoped_refptr<const PermissionSet> permissions) const {
 136   base::AutoLock auto_lock(runtime_lock_);
 137   CHECK_GE(tab_id, 0);
 138   TabPermissionsMap::iterator iter = tab_specific_permissions_.find(tab_id);
 139   if (iter == tab_specific_permissions_.end())
 140     tab_specific_permissions_[tab_id] = permissions;
 141   else
 142     iter->second =
 143         PermissionSet::CreateUnion(iter->second.get(), permissions.get());
 144 }
 145
 146 void PermissionsData::ClearTabSpecificPermissions(int tab_id) const {
 147   base::AutoLock auto_lock(runtime_lock_);
 148   CHECK_GE(tab_id, 0);
 149   tab_specific_permissions_.erase(tab_id);
 150 }
 151
 152 bool PermissionsData::HasAPIPermission(APIPermission::ID permission) const {
 153   return active_permissions()->HasAPIPermission(permission);
 154 }
 155
 156 bool PermissionsData::HasAPIPermission(
 157     const std::string& permission_name) const {
 158   return active_permissions()->HasAPIPermission(permission_name);
 159 }
 160
 161 bool PermissionsData::HasAPIPermissionForTab(
 162     int tab_id,
 163     APIPermission::ID permission) const {
 164   if (HasAPIPermission(permission))
 165     return true;
 166
 167   scoped_refptr<const PermissionSet> tab_permissions =
 168       GetTabSpecificPermissions(tab_id);
 169
 170   // Place autolock below the HasAPIPermission() and
 171   // GetTabSpecificPermissions(), since each already acquires the lock.
 172   base::AutoLock auto_lock(runtime_lock_);
 173   return tab_permissions.get() && tab_permissions->HasAPIPermission(permission);
 174 }
 175
 176 bool PermissionsData::CheckAPIPermissionWithParam(
 177     APIPermission::ID permission,
 178     const APIPermission::CheckParam* param) const {
 179   return active_permissions()->CheckAPIPermissionWithParam(permission, param);
 180 }
 181
 182 URLPatternSet PermissionsData::GetEffectiveHostPermissions() const {
 183   base::AutoLock auto_lock(runtime_lock_);
 184   URLPatternSet effective_hosts = active_permissions_unsafe_->effective_hosts();
 185   for (const auto& val : tab_specific_permissions_)
 186     effective_hosts.AddPatterns(val.second->effective_hosts());
 187   return effective_hosts;
 188 }
 189
 190 bool PermissionsData::HasHostPermission(const GURL& url) const {
 191   return active_permissions()->HasExplicitAccessToOrigin(url);
 192 }
 193
 194 bool PermissionsData::HasEffectiveAccessToAllHosts() const {
 195   return active_permissions()->HasEffectiveAccessToAllHosts();
 196 }
 197
 198 PermissionMessageIDs PermissionsData::GetLegacyPermissionMessageIDs() const {
 199   if (ShouldSkipPermissionWarnings(extension_id_)) {
 200     return PermissionMessageIDs();
 201   } else {
 202     return PermissionMessageProvider::Get()->GetLegacyPermissionMessageIDs(
 203         active_permissions().get(), manifest_type_);
 204   }
 205 }
 206
 207 PermissionMessageStrings PermissionsData::GetPermissionMessageStrings() const {
 208   if (ShouldSkipPermissionWarnings(extension_id_))
 209     return PermissionMessageStrings();
 210   return PermissionMessageProvider::Get()->GetPermissionMessageStrings(
 211       active_permissions().get(), manifest_type_);
 212 }
 213
 214 CoalescedPermissionMessages PermissionsData::GetCoalescedPermissionMessages()
 215     const {
 216   return PermissionMessageProvider::Get()->GetCoalescedPermissionMessages(
 217       PermissionMessageProvider::Get()->GetAllPermissionIDs(
 218           active_permissions().get(), manifest_type_));
 219 }
 220
 221 bool PermissionsData::HasWithheldImpliedAllHosts() const {
 222   // Since we currently only withhold all_hosts, it's sufficient to check
 223   // that either set is not empty.
 224   return !withheld_permissions()->explicit_hosts().is_empty() ||
 225          !withheld_permissions()->scriptable_hosts().is_empty();
 226 }
 227
 228 bool PermissionsData::CanAccessPage(const Extension* extension,
 229                                     const GURL& document_url,
 230                                     const GURL& top_frame_url,
 231                                     int tab_id,
 232                                     int process_id,
 233                                     std::string* error) const {
 234   AccessType result = CanRunOnPage(extension,
 235                                    document_url,
 236                                    top_frame_url,
 237                                    tab_id,
 238                                    process_id,
 239                                    active_permissions()->explicit_hosts(),
 240                                    withheld_permissions()->explicit_hosts(),
 241                                    error);
 242   // TODO(rdevlin.cronin) Update callers so that they only need ACCESS_ALLOWED.
 243   return result == ACCESS_ALLOWED || result == ACCESS_WITHHELD;
 244 }
 245
 246 PermissionsData::AccessType PermissionsData::GetPageAccess(
 247     const Extension* extension,
 248     const GURL& document_url,
 249     const GURL& top_frame_url,
 250     int tab_id,
 251     int process_id,
 252     std::string* error) const {
 253   return CanRunOnPage(extension,
 254                       document_url,
 255                       top_frame_url,
 256                       tab_id,
 257                       process_id,
 258                       active_permissions()->explicit_hosts(),
 259                       withheld_permissions()->explicit_hosts(),
 260                       error);
 261 }
 262
 263 bool PermissionsData::CanRunContentScriptOnPage(const Extension* extension,
 264                                                 const GURL& document_url,
 265                                                 const GURL& top_frame_url,
 266                                                 int tab_id,
 267                                                 int process_id,
 268                                                 std::string* error) const {
 269   AccessType result = CanRunOnPage(extension,
 270                                    document_url,
 271                                    top_frame_url,
 272                                    tab_id,
 273                                    process_id,
 274                                    active_permissions()->scriptable_hosts(),
 275                                    withheld_permissions()->scriptable_hosts(),
 276                                    error);
 277   // TODO(rdevlin.cronin) Update callers so that they only need ACCESS_ALLOWED.
 278   return result == ACCESS_ALLOWED || result == ACCESS_WITHHELD;
 279 }
 280
 281 PermissionsData::AccessType PermissionsData::GetContentScriptAccess(
 282     const Extension* extension,
 283     const GURL& document_url,
 284     const GURL& top_frame_url,
 285     int tab_id,
 286     int process_id,
 287     std::string* error) const {
 288   return CanRunOnPage(extension,
 289                       document_url,
 290                       top_frame_url,
 291                       tab_id,
 292                       process_id,
 293                       active_permissions()->scriptable_hosts(),
 294                       withheld_permissions()->scriptable_hosts(),
 295                       error);
 296 }
 297
 298 bool PermissionsData::CanCaptureVisiblePage(int tab_id,
 299                                             std::string* error) const {
 300   const URLPattern all_urls(URLPattern::SCHEME_ALL,
 301                             URLPattern::kAllUrlsPattern);
 302
 303   if (active_permissions()->explicit_hosts().ContainsPattern(all_urls))
 304     return true;
 305
 306   if (tab_id >= 0) {
 307     scoped_refptr<const PermissionSet> tab_permissions =
 308         GetTabSpecificPermissions(tab_id);
 309     if (tab_permissions.get() &&
 310         tab_permissions->HasAPIPermission(APIPermission::kTab)) {
 311       return true;
 312     }
 313     if (error)
 314       *error = manifest_errors::kActiveTabPermissionNotGranted;
 315     return false;
 316   }
 317
 318   if (error)
 319     *error = manifest_errors::kAllURLOrActiveTabNeeded;
 320   return false;
 321 }
 322
 323 scoped_refptr<const PermissionSet> PermissionsData::GetTabSpecificPermissions(
 324     int tab_id) const {
 325   base::AutoLock auto_lock(runtime_lock_);
 326   CHECK_GE(tab_id, 0);
 327   TabPermissionsMap::const_iterator iter =
 328       tab_specific_permissions_.find(tab_id);
 329   return (iter != tab_specific_permissions_.end()) ? iter->second : NULL;
 330 }
 331
 332 bool PermissionsData::HasTabSpecificPermissionToExecuteScript(
 333     int tab_id,
 334     const GURL& url) const {
 335   if (tab_id >= 0) {
 336     scoped_refptr<const PermissionSet> tab_permissions =
 337         GetTabSpecificPermissions(tab_id);
 338     if (tab_permissions.get() &&
 339         tab_permissions->explicit_hosts().MatchesSecurityOrigin(url)) {
 340       return true;
 341     }
 342   }
 343   return false;
 344 }
 345
 346 PermissionsData::AccessType PermissionsData::CanRunOnPage(
 347     const Extension* extension,
 348     const GURL& document_url,
 349     const GURL& top_frame_url,
 350     int tab_id,
 351     int process_id,
 352     const URLPatternSet& permitted_url_patterns,
 353     const URLPatternSet& withheld_url_patterns,
 354     std::string* error) const {
 355   if (g_policy_delegate &&
 356       !g_policy_delegate->CanExecuteScriptOnPage(
 357           extension, document_url, top_frame_url, tab_id, process_id, error)) {
 358     return ACCESS_DENIED;
 359   }
 360
 361   if (IsRestrictedUrl(document_url, top_frame_url, extension, error))
 362     return ACCESS_DENIED;
 363
 364   if (HasTabSpecificPermissionToExecuteScript(tab_id, top_frame_url))
 365     return ACCESS_ALLOWED;
 366
 367   if (permitted_url_patterns.MatchesURL(document_url))
 368     return ACCESS_ALLOWED;
 369
 370   if (withheld_url_patterns.MatchesURL(document_url))
 371     return ACCESS_WITHHELD;
 372
 373   if (error) {
 374     *error = ErrorUtils::FormatErrorMessage(manifest_errors::kCannotAccessPage,
 375                                             document_url.spec());
 376   }
 377   return ACCESS_DENIED;
 378 }
 379
 380 }  // namespace extensions