content/browser/child_process_security_policy_impl.cc

   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 "content/browser/child_process_security_policy_impl.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/files/file_path.h"
   9 #include "base/logging.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/platform_file.h"
  12 #include "base/stl_util.h"
  13 #include "base/strings/string_util.h"
  14 #include "content/browser/plugin_process_host.h"
  15 #include "content/browser/site_instance_impl.h"
  16 #include "content/public/browser/child_process_data.h"
  17 #include "content/public/browser/content_browser_client.h"
  18 #include "content/public/browser/render_process_host.h"
  19 #include "content/public/common/bindings_policy.h"
  20 #include "content/public/common/content_switches.h"
  21 #include "content/public/common/url_constants.h"
  22 #include "net/base/net_util.h"
  23 #include "net/url_request/url_request.h"
  24 #include "url/gurl.h"
  25 #include "webkit/browser/fileapi/file_permission_policy.h"
  26 #include "webkit/browser/fileapi/file_system_url.h"
  27 #include "webkit/browser/fileapi/isolated_context.h"
  28 #include "webkit/common/fileapi/file_system_util.h"
  29
  30 namespace content {
  31
  32 namespace {
  33
  34 // Used internally only. These bit positions have no relationship to any
  35 // underlying OS and can be changed to accommodate finer-grained permissions.
  36 enum ChildProcessSecurityPermissions {
  37   READ_FILE_PERMISSION             = 1 << 0,
  38   WRITE_FILE_PERMISSION            = 1 << 1,
  39   CREATE_NEW_FILE_PERMISSION       = 1 << 2,
  40   CREATE_OVERWRITE_FILE_PERMISSION = 1 << 3,
  41   DELETE_FILE_PERMISSION           = 1 << 4,
  42
  43   // Used by Media Galleries API
  44   COPY_INTO_FILE_PERMISSION        = 1 << 5,
  45 };
  46
  47 // Used internally only. Bitmasks that are actually used by the Grant* and Can*
  48 // methods. These contain one or more ChildProcessSecurityPermissions.
  49 enum ChildProcessSecurityGrants {
  50   READ_FILE_GRANT              = READ_FILE_PERMISSION,
  51   WRITE_FILE_GRANT             = WRITE_FILE_PERMISSION,
  52
  53   CREATE_NEW_FILE_GRANT        = CREATE_NEW_FILE_PERMISSION |
  54                                  COPY_INTO_FILE_PERMISSION,
  55
  56   CREATE_READ_WRITE_FILE_GRANT = CREATE_NEW_FILE_PERMISSION |
  57                                  CREATE_OVERWRITE_FILE_PERMISSION |
  58                                  READ_FILE_PERMISSION |
  59                                  WRITE_FILE_PERMISSION |
  60                                  COPY_INTO_FILE_PERMISSION |
  61                                  DELETE_FILE_PERMISSION,
  62
  63   COPY_INTO_FILE_GRANT         = COPY_INTO_FILE_PERMISSION,
  64   DELETE_FILE_GRANT            = DELETE_FILE_PERMISSION,
  65 };
  66
  67 }  // namespace
  68
  69 // The SecurityState class is used to maintain per-child process security state
  70 // information.
  71 class ChildProcessSecurityPolicyImpl::SecurityState {
  72  public:
  73   SecurityState()
  74     : enabled_bindings_(0),
  75       can_read_raw_cookies_(false),
  76       can_send_midi_sysex_(false) { }
  77
  78   ~SecurityState() {
  79     scheme_policy_.clear();
  80     fileapi::IsolatedContext* isolated_context =
  81         fileapi::IsolatedContext::GetInstance();
  82     for (FileSystemMap::iterator iter = filesystem_permissions_.begin();
  83          iter != filesystem_permissions_.end();
  84          ++iter) {
  85       isolated_context->RemoveReference(iter->first);
  86     }
  87     UMA_HISTOGRAM_COUNTS("ChildProcessSecurityPolicy.PerChildFilePermissions",
  88                          file_permissions_.size());
  89   }
  90
  91   // Grant permission to request URLs with the specified scheme.
  92   void GrantScheme(const std::string& scheme) {
  93     scheme_policy_[scheme] = true;
  94   }
  95
  96   // Revoke permission to request URLs with the specified scheme.
  97   void RevokeScheme(const std::string& scheme) {
  98     scheme_policy_[scheme] = false;
  99   }
 100
 101   // Grant certain permissions to a file.
 102   void GrantPermissionsForFile(const base::FilePath& file, int permissions) {
 103     base::FilePath stripped = file.StripTrailingSeparators();
 104     file_permissions_[stripped] |= permissions;
 105     UMA_HISTOGRAM_COUNTS("ChildProcessSecurityPolicy.FilePermissionPathLength",
 106                          stripped.value().size());
 107   }
 108
 109   // Grant navigation to a file but not the file:// scheme in general.
 110   void GrantRequestOfSpecificFile(const base::FilePath &file) {
 111     request_file_set_.insert(file.StripTrailingSeparators());
 112   }
 113
 114   // Revokes all permissions granted to a file.
 115   void RevokeAllPermissionsForFile(const base::FilePath& file) {
 116     base::FilePath stripped = file.StripTrailingSeparators();
 117     file_permissions_.erase(stripped);
 118     request_file_set_.erase(stripped);
 119   }
 120
 121   // Grant certain permissions to a file.
 122   void GrantPermissionsForFileSystem(const std::string& filesystem_id,
 123                                      int permissions) {
 124     if (!ContainsKey(filesystem_permissions_, filesystem_id))
 125       fileapi::IsolatedContext::GetInstance()->AddReference(filesystem_id);
 126     filesystem_permissions_[filesystem_id] |= permissions;
 127   }
 128
 129   bool HasPermissionsForFileSystem(const std::string& filesystem_id,
 130                                    int permissions) {
 131     FileSystemMap::const_iterator it =
 132         filesystem_permissions_.find(filesystem_id);
 133     if (it == filesystem_permissions_.end())
 134       return false;
 135     return (it->second & permissions) == permissions;
 136   }
 137
 138 #if defined(OS_ANDROID)
 139   // Determine if the certain permissions have been granted to a content URI.
 140   bool HasPermissionsForContentUri(const base::FilePath& file,
 141                                    int permissions) {
 142     DCHECK(!file.empty());
 143     DCHECK(file.IsContentUri());
 144     if (!permissions)
 145       return false;
 146     base::FilePath file_path = file.StripTrailingSeparators();
 147     FileMap::const_iterator it = file_permissions_.find(file_path);
 148     if (it != file_permissions_.end())
 149       return (it->second & permissions) == permissions;
 150     return false;
 151   }
 152 #endif
 153
 154   void GrantBindings(int bindings) {
 155     enabled_bindings_ |= bindings;
 156   }
 157
 158   void GrantReadRawCookies() {
 159     can_read_raw_cookies_ = true;
 160   }
 161
 162   void RevokeReadRawCookies() {
 163     can_read_raw_cookies_ = false;
 164   }
 165
 166   void GrantPermissionForMidiSysEx() {
 167     can_send_midi_sysex_ = true;
 168   }
 169
 170   // Determine whether permission has been granted to request |url|.
 171   bool CanRequestURL(const GURL& url) {
 172     // Having permission to a scheme implies permssion to all of its URLs.
 173     SchemeMap::const_iterator judgment(scheme_policy_.find(url.scheme()));
 174     if (judgment != scheme_policy_.end())
 175       return judgment->second;
 176
 177     // file:// URLs are more granular.  The child may have been given
 178     // permission to a specific file but not the file:// scheme in general.
 179     if (url.SchemeIs(kFileScheme)) {
 180       base::FilePath path;
 181       if (net::FileURLToFilePath(url, &path))
 182         return ContainsKey(request_file_set_, path);
 183     }
 184
 185     return false;  // Unmentioned schemes are disallowed.
 186   }
 187
 188   // Determine if the certain permissions have been granted to a file.
 189   bool HasPermissionsForFile(const base::FilePath& file, int permissions) {
 190 #if defined(OS_ANDROID)
 191     if (file.IsContentUri())
 192       return HasPermissionsForContentUri(file, permissions);
 193 #endif
 194     if (!permissions || file.empty() || !file.IsAbsolute())
 195       return false;
 196     base::FilePath current_path = file.StripTrailingSeparators();
 197     base::FilePath last_path;
 198     int skip = 0;
 199     while (current_path != last_path) {
 200       base::FilePath base_name = current_path.BaseName();
 201       if (base_name.value() == base::FilePath::kParentDirectory) {
 202         ++skip;
 203       } else if (skip > 0) {
 204         if (base_name.value() != base::FilePath::kCurrentDirectory)
 205           --skip;
 206       } else {
 207         FileMap::const_iterator it = file_permissions_.find(current_path);
 208         if (it != file_permissions_.end())
 209           return (it->second & permissions) == permissions;
 210       }
 211       last_path = current_path;
 212       current_path = current_path.DirName();
 213     }
 214
 215     return false;
 216   }
 217
 218   bool CanLoadPage(const GURL& gurl) {
 219     if (origin_lock_.is_empty())
 220       return true;
 221
 222     // TODO(creis): We must pass the valid browser_context to convert hosted
 223     // apps URLs.  Currently, hosted apps cannot be loaded in this mode.
 224     // See http://crbug.com/160576.
 225     GURL site_gurl = SiteInstanceImpl::GetSiteForURL(NULL, gurl);
 226     return origin_lock_ == site_gurl;
 227   }
 228
 229   bool CanAccessCookiesForOrigin(const GURL& gurl) {
 230     if (origin_lock_.is_empty())
 231       return true;
 232     // TODO(creis): We must pass the valid browser_context to convert hosted
 233     // apps URLs.  Currently, hosted apps cannot set cookies in this mode.
 234     // See http://crbug.com/160576.
 235     GURL site_gurl = SiteInstanceImpl::GetSiteForURL(NULL, gurl);
 236     return origin_lock_ == site_gurl;
 237   }
 238
 239   bool CanSendCookiesForOrigin(const GURL& gurl) {
 240     // We only block cross-site cookies on network requests if the
 241     // --enable-strict-site-isolation flag is passed.  This is expected to break
 242     // compatibility with many sites.  The similar --site-per-process flag only
 243     // blocks JavaScript access to cross-site cookies (in
 244     // CanAccessCookiesForOrigin).
 245     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 246     if (!command_line.HasSwitch(switches::kEnableStrictSiteIsolation))
 247       return true;
 248
 249     if (origin_lock_.is_empty())
 250       return true;
 251     // TODO(creis): We must pass the valid browser_context to convert hosted
 252     // apps URLs.  Currently, hosted apps cannot set cookies in this mode.
 253     // See http://crbug.com/160576.
 254     GURL site_gurl = SiteInstanceImpl::GetSiteForURL(NULL, gurl);
 255     return origin_lock_ == site_gurl;
 256   }
 257
 258   void LockToOrigin(const GURL& gurl) {
 259     origin_lock_ = gurl;
 260   }
 261
 262   bool has_web_ui_bindings() const {
 263     return enabled_bindings_ & BINDINGS_POLICY_WEB_UI;
 264   }
 265
 266   bool can_read_raw_cookies() const {
 267     return can_read_raw_cookies_;
 268   }
 269
 270   bool can_send_midi_sysex() const {
 271     return can_send_midi_sysex_;
 272   }
 273
 274  private:
 275   typedef std::map<std::string, bool> SchemeMap;
 276
 277   typedef int FilePermissionFlags;  // bit-set of PlatformFileFlags
 278   typedef std::map<base::FilePath, FilePermissionFlags> FileMap;
 279   typedef std::map<std::string, FilePermissionFlags> FileSystemMap;
 280   typedef std::set<base::FilePath> FileSet;
 281
 282   // Maps URL schemes to whether permission has been granted or revoked:
 283   //   |true| means the scheme has been granted.
 284   //   |false| means the scheme has been revoked.
 285   // If a scheme is not present in the map, then it has never been granted
 286   // or revoked.
 287   SchemeMap scheme_policy_;
 288
 289   // The set of files the child process is permited to upload to the web.
 290   FileMap file_permissions_;
 291
 292   // The set of files the child process is permitted to load.
 293   FileSet request_file_set_;
 294
 295   int enabled_bindings_;
 296
 297   bool can_read_raw_cookies_;
 298
 299   bool can_send_midi_sysex_;
 300
 301   GURL origin_lock_;
 302
 303   // The set of isolated filesystems the child process is permitted to access.
 304   FileSystemMap filesystem_permissions_;
 305
 306   DISALLOW_COPY_AND_ASSIGN(SecurityState);
 307 };
 308
 309 ChildProcessSecurityPolicyImpl::ChildProcessSecurityPolicyImpl() {
 310   // We know about these schemes and believe them to be safe.
 311   RegisterWebSafeScheme(kHttpScheme);
 312   RegisterWebSafeScheme(kHttpsScheme);
 313   RegisterWebSafeScheme(kFtpScheme);
 314   RegisterWebSafeScheme(kDataScheme);
 315   RegisterWebSafeScheme("feed");
 316   RegisterWebSafeScheme(chrome::kBlobScheme);
 317   RegisterWebSafeScheme(kFileSystemScheme);
 318
 319   // We know about the following pseudo schemes and treat them specially.
 320   RegisterPseudoScheme(chrome::kAboutScheme);
 321   RegisterPseudoScheme(kJavaScriptScheme);
 322   RegisterPseudoScheme(kViewSourceScheme);
 323 }
 324
 325 ChildProcessSecurityPolicyImpl::~ChildProcessSecurityPolicyImpl() {
 326   web_safe_schemes_.clear();
 327   pseudo_schemes_.clear();
 328   STLDeleteContainerPairSecondPointers(security_state_.begin(),
 329                                        security_state_.end());
 330   security_state_.clear();
 331 }
 332
 333 // static
 334 ChildProcessSecurityPolicy* ChildProcessSecurityPolicy::GetInstance() {
 335   return ChildProcessSecurityPolicyImpl::GetInstance();
 336 }
 337
 338 ChildProcessSecurityPolicyImpl* ChildProcessSecurityPolicyImpl::GetInstance() {
 339   return Singleton<ChildProcessSecurityPolicyImpl>::get();
 340 }
 341
 342 void ChildProcessSecurityPolicyImpl::Add(int child_id) {
 343   base::AutoLock lock(lock_);
 344   AddChild(child_id);
 345 }
 346
 347 void ChildProcessSecurityPolicyImpl::AddWorker(int child_id,
 348                                                int main_render_process_id) {
 349   base::AutoLock lock(lock_);
 350   AddChild(child_id);
 351   worker_map_[child_id] = main_render_process_id;
 352 }
 353
 354 void ChildProcessSecurityPolicyImpl::Remove(int child_id) {
 355   base::AutoLock lock(lock_);
 356   SecurityStateMap::iterator it = security_state_.find(child_id);
 357   if (it == security_state_.end())
 358     return;  // May be called multiple times.
 359
 360   delete it->second;
 361   security_state_.erase(it);
 362   worker_map_.erase(child_id);
 363 }
 364
 365 void ChildProcessSecurityPolicyImpl::RegisterWebSafeScheme(
 366     const std::string& scheme) {
 367   base::AutoLock lock(lock_);
 368   DCHECK_EQ(0U, web_safe_schemes_.count(scheme)) << "Add schemes at most once.";
 369   DCHECK_EQ(0U, pseudo_schemes_.count(scheme))
 370       << "Web-safe implies not pseudo.";
 371
 372   web_safe_schemes_.insert(scheme);
 373 }
 374
 375 bool ChildProcessSecurityPolicyImpl::IsWebSafeScheme(
 376     const std::string& scheme) {
 377   base::AutoLock lock(lock_);
 378
 379   return ContainsKey(web_safe_schemes_, scheme);
 380 }
 381
 382 void ChildProcessSecurityPolicyImpl::RegisterPseudoScheme(
 383     const std::string& scheme) {
 384   base::AutoLock lock(lock_);
 385   DCHECK_EQ(0U, pseudo_schemes_.count(scheme)) << "Add schemes at most once.";
 386   DCHECK_EQ(0U, web_safe_schemes_.count(scheme))
 387       << "Pseudo implies not web-safe.";
 388
 389   pseudo_schemes_.insert(scheme);
 390 }
 391
 392 bool ChildProcessSecurityPolicyImpl::IsPseudoScheme(
 393     const std::string& scheme) {
 394   base::AutoLock lock(lock_);
 395
 396   return ContainsKey(pseudo_schemes_, scheme);
 397 }
 398
 399 void ChildProcessSecurityPolicyImpl::GrantRequestURL(
 400     int child_id, const GURL& url) {
 401
 402   if (!url.is_valid())
 403     return;  // Can't grant the capability to request invalid URLs.
 404
 405   if (IsWebSafeScheme(url.scheme()))
 406     return;  // The scheme has already been whitelisted for every child process.
 407
 408   if (IsPseudoScheme(url.scheme())) {
 409     // The view-source scheme is a special case of a pseudo-URL that eventually
 410     // results in requesting its embedded URL.
 411     if (url.SchemeIs(kViewSourceScheme)) {
 412       // URLs with the view-source scheme typically look like:
 413       //   view-source:http://www.google.com/a
 414       // In order to request these URLs, the child_id needs to be able to
 415       // request the embedded URL.
 416       GrantRequestURL(child_id, GURL(url.GetContent()));
 417     }
 418
 419     return;  // Can't grant the capability to request pseudo schemes.
 420   }
 421
 422   {
 423     base::AutoLock lock(lock_);
 424     SecurityStateMap::iterator state = security_state_.find(child_id);
 425     if (state == security_state_.end())
 426       return;
 427
 428     // When the child process has been commanded to request this scheme,
 429     // we grant it the capability to request all URLs of that scheme.
 430     state->second->GrantScheme(url.scheme());
 431   }
 432 }
 433
 434 void ChildProcessSecurityPolicyImpl::GrantRequestSpecificFileURL(
 435     int child_id,
 436     const GURL& url) {
 437   if (!url.SchemeIs(kFileScheme))
 438     return;
 439
 440   {
 441     base::AutoLock lock(lock_);
 442     SecurityStateMap::iterator state = security_state_.find(child_id);
 443     if (state == security_state_.end())
 444       return;
 445
 446     // When the child process has been commanded to request a file:// URL,
 447     // then we grant it the capability for that URL only.
 448     base::FilePath path;
 449     if (net::FileURLToFilePath(url, &path))
 450       state->second->GrantRequestOfSpecificFile(path);
 451   }
 452 }
 453
 454 void ChildProcessSecurityPolicyImpl::GrantReadFile(int child_id,
 455                                                    const base::FilePath& file) {
 456   GrantPermissionsForFile(child_id, file, READ_FILE_GRANT);
 457 }
 458
 459 void ChildProcessSecurityPolicyImpl::GrantCreateReadWriteFile(
 460     int child_id, const base::FilePath& file) {
 461   GrantPermissionsForFile(child_id, file, CREATE_READ_WRITE_FILE_GRANT);
 462 }
 463
 464 void ChildProcessSecurityPolicyImpl::GrantPermissionsForFile(
 465     int child_id, const base::FilePath& file, int permissions) {
 466   base::AutoLock lock(lock_);
 467
 468   SecurityStateMap::iterator state = security_state_.find(child_id);
 469   if (state == security_state_.end())
 470     return;
 471
 472   state->second->GrantPermissionsForFile(file, permissions);
 473 }
 474
 475 void ChildProcessSecurityPolicyImpl::RevokeAllPermissionsForFile(
 476     int child_id, const base::FilePath& file) {
 477   base::AutoLock lock(lock_);
 478
 479   SecurityStateMap::iterator state = security_state_.find(child_id);
 480   if (state == security_state_.end())
 481     return;
 482
 483   state->second->RevokeAllPermissionsForFile(file);
 484 }
 485
 486 void ChildProcessSecurityPolicyImpl::GrantReadFileSystem(
 487     int child_id, const std::string& filesystem_id) {
 488   GrantPermissionsForFileSystem(child_id, filesystem_id, READ_FILE_GRANT);
 489 }
 490
 491 void ChildProcessSecurityPolicyImpl::GrantWriteFileSystem(
 492     int child_id, const std::string& filesystem_id) {
 493   GrantPermissionsForFileSystem(child_id, filesystem_id, WRITE_FILE_GRANT);
 494 }
 495
 496 void ChildProcessSecurityPolicyImpl::GrantCreateFileForFileSystem(
 497     int child_id, const std::string& filesystem_id) {
 498   GrantPermissionsForFileSystem(child_id, filesystem_id, CREATE_NEW_FILE_GRANT);
 499 }
 500
 501 void ChildProcessSecurityPolicyImpl::GrantCreateReadWriteFileSystem(
 502     int child_id, const std::string& filesystem_id) {
 503   GrantPermissionsForFileSystem(
 504       child_id, filesystem_id, CREATE_READ_WRITE_FILE_GRANT);
 505 }
 506
 507 void ChildProcessSecurityPolicyImpl::GrantCopyIntoFileSystem(
 508     int child_id, const std::string& filesystem_id) {
 509   GrantPermissionsForFileSystem(child_id, filesystem_id, COPY_INTO_FILE_GRANT);
 510 }
 511
 512 void ChildProcessSecurityPolicyImpl::GrantDeleteFromFileSystem(
 513     int child_id, const std::string& filesystem_id) {
 514   GrantPermissionsForFileSystem(child_id, filesystem_id, DELETE_FILE_GRANT);
 515 }
 516
 517 void ChildProcessSecurityPolicyImpl::GrantSendMidiSysExMessage(int child_id) {
 518   base::AutoLock lock(lock_);
 519
 520   SecurityStateMap::iterator state = security_state_.find(child_id);
 521   if (state == security_state_.end())
 522     return;
 523
 524   state->second->GrantPermissionForMidiSysEx();
 525 }
 526
 527 void ChildProcessSecurityPolicyImpl::GrantScheme(int child_id,
 528                                                  const std::string& scheme) {
 529   base::AutoLock lock(lock_);
 530
 531   SecurityStateMap::iterator state = security_state_.find(child_id);
 532   if (state == security_state_.end())
 533     return;
 534
 535   state->second->GrantScheme(scheme);
 536 }
 537
 538 void ChildProcessSecurityPolicyImpl::GrantWebUIBindings(int child_id) {
 539   base::AutoLock lock(lock_);
 540
 541   SecurityStateMap::iterator state = security_state_.find(child_id);
 542   if (state == security_state_.end())
 543     return;
 544
 545   state->second->GrantBindings(BINDINGS_POLICY_WEB_UI);
 546
 547   // Web UI bindings need the ability to request chrome: URLs.
 548   state->second->GrantScheme(chrome::kChromeUIScheme);
 549
 550   // Web UI pages can contain links to file:// URLs.
 551   state->second->GrantScheme(kFileScheme);
 552 }
 553
 554 void ChildProcessSecurityPolicyImpl::GrantReadRawCookies(int child_id) {
 555   base::AutoLock lock(lock_);
 556
 557   SecurityStateMap::iterator state = security_state_.find(child_id);
 558   if (state == security_state_.end())
 559     return;
 560
 561   state->second->GrantReadRawCookies();
 562 }
 563
 564 void ChildProcessSecurityPolicyImpl::RevokeReadRawCookies(int child_id) {
 565   base::AutoLock lock(lock_);
 566
 567   SecurityStateMap::iterator state = security_state_.find(child_id);
 568   if (state == security_state_.end())
 569     return;
 570
 571   state->second->RevokeReadRawCookies();
 572 }
 573
 574 bool ChildProcessSecurityPolicyImpl::CanLoadPage(
 575     int child_id,
 576     const GURL& url,
 577     ResourceType::Type resource_type) {
 578   // If --site-per-process flag is passed, we should enforce
 579   // stronger security restrictions on page navigation.
 580   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess) &&
 581       ResourceType::IsFrame(resource_type)) {
 582     // TODO(nasko): Do the proper check for site-per-process, once
 583     // out-of-process iframes is ready to go.
 584     return true;
 585   }
 586   return true;
 587 }
 588
 589 bool ChildProcessSecurityPolicyImpl::CanRequestURL(
 590     int child_id, const GURL& url) {
 591   if (!url.is_valid())
 592     return false;  // Can't request invalid URLs.
 593
 594   if (IsWebSafeScheme(url.scheme()))
 595     return true;  // The scheme has been white-listed for every child process.
 596
 597   if (IsPseudoScheme(url.scheme())) {
 598     // There are a number of special cases for pseudo schemes.
 599
 600     if (url.SchemeIs(kViewSourceScheme)) {
 601       // A view-source URL is allowed if the child process is permitted to
 602       // request the embedded URL. Careful to avoid pointless recursion.
 603       GURL child_url(url.GetContent());
 604       if (child_url.SchemeIs(kViewSourceScheme) &&
 605           url.SchemeIs(kViewSourceScheme))
 606           return false;
 607
 608       return CanRequestURL(child_id, child_url);
 609     }
 610
 611     if (LowerCaseEqualsASCII(url.spec(), kAboutBlankURL))
 612       return true;  // Every child process can request <about:blank>.
 613
 614     // URLs like <about:memory> and <about:crash> shouldn't be requestable by
 615     // any child process.  Also, this case covers <javascript:...>, which should
 616     // be handled internally by the process and not kicked up to the browser.
 617     return false;
 618   }
 619
 620   if (!GetContentClient()->browser()->IsHandledURL(url) &&
 621       !net::URLRequest::IsHandledURL(url)) {
 622     return true;  // This URL request is destined for ShellExecute.
 623   }
 624
 625   {
 626     base::AutoLock lock(lock_);
 627
 628     SecurityStateMap::iterator state = security_state_.find(child_id);
 629     if (state == security_state_.end())
 630       return false;
 631
 632     // Otherwise, we consult the child process's security state to see if it is
 633     // allowed to request the URL.
 634     return state->second->CanRequestURL(url);
 635   }
 636 }
 637
 638 bool ChildProcessSecurityPolicyImpl::CanReadFile(int child_id,
 639                                                  const base::FilePath& file) {
 640   return HasPermissionsForFile(child_id, file, READ_FILE_GRANT);
 641 }
 642
 643 bool ChildProcessSecurityPolicyImpl::CanCreateReadWriteFile(
 644     int child_id,
 645     const base::FilePath& file) {
 646   return HasPermissionsForFile(child_id, file, CREATE_READ_WRITE_FILE_GRANT);
 647 }
 648
 649 bool ChildProcessSecurityPolicyImpl::CanReadFileSystem(
 650     int child_id, const std::string& filesystem_id) {
 651   return HasPermissionsForFileSystem(child_id, filesystem_id, READ_FILE_GRANT);
 652 }
 653
 654 bool ChildProcessSecurityPolicyImpl::CanReadWriteFileSystem(
 655     int child_id, const std::string& filesystem_id) {
 656   return HasPermissionsForFileSystem(child_id, filesystem_id,
 657                                      READ_FILE_GRANT | WRITE_FILE_GRANT);
 658 }
 659
 660 bool ChildProcessSecurityPolicyImpl::CanCopyIntoFileSystem(
 661     int child_id, const std::string& filesystem_id) {
 662   return HasPermissionsForFileSystem(child_id, filesystem_id,
 663                                      COPY_INTO_FILE_GRANT);
 664 }
 665
 666 bool ChildProcessSecurityPolicyImpl::CanDeleteFromFileSystem(
 667     int child_id, const std::string& filesystem_id) {
 668   return HasPermissionsForFileSystem(child_id, filesystem_id,
 669                                      DELETE_FILE_GRANT);
 670 }
 671
 672 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFile(
 673     int child_id, const base::FilePath& file, int permissions) {
 674   base::AutoLock lock(lock_);
 675   bool result = ChildProcessHasPermissionsForFile(child_id, file, permissions);
 676   if (!result) {
 677     // If this is a worker thread that has no access to a given file,
 678     // let's check that its renderer process has access to that file instead.
 679     WorkerToMainProcessMap::iterator iter = worker_map_.find(child_id);
 680     if (iter != worker_map_.end() && iter->second != 0) {
 681       result = ChildProcessHasPermissionsForFile(iter->second,
 682                                                  file,
 683                                                  permissions);
 684     }
 685   }
 686   return result;
 687 }
 688
 689 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFileSystemFile(
 690     int child_id, const fileapi::FileSystemURL& url, int permissions) {
 691   if (!url.is_valid())
 692     return false;
 693
 694   if (url.path().ReferencesParent())
 695     return false;
 696
 697   // Any write access is disallowed on the root path.
 698   if (fileapi::VirtualPath::IsRootPath(url.path()) &&
 699       (permissions & ~READ_FILE_GRANT)) {
 700     return false;
 701   }
 702
 703   if (url.mount_type() == fileapi::kFileSystemTypeIsolated) {
 704     // When Isolated filesystems is overlayed on top of another filesystem,
 705     // its per-filesystem permission overrides the underlying filesystem
 706     // permissions).
 707     return HasPermissionsForFileSystem(
 708         child_id, url.mount_filesystem_id(), permissions);
 709   }
 710
 711   FileSystemPermissionPolicyMap::iterator found =
 712       file_system_policy_map_.find(url.type());
 713   if (found == file_system_policy_map_.end())
 714     return false;
 715
 716   if ((found->second & fileapi::FILE_PERMISSION_READ_ONLY) &&
 717       permissions & ~READ_FILE_GRANT) {
 718     return false;
 719   }
 720
 721   if (found->second & fileapi::FILE_PERMISSION_USE_FILE_PERMISSION)
 722     return HasPermissionsForFile(child_id, url.path(), permissions);
 723
 724   if (found->second & fileapi::FILE_PERMISSION_SANDBOX)
 725     return true;
 726
 727   return false;
 728 }
 729
 730 bool ChildProcessSecurityPolicyImpl::CanReadFileSystemFile(
 731     int child_id,
 732     const fileapi::FileSystemURL& url) {
 733   return HasPermissionsForFileSystemFile(child_id, url, READ_FILE_GRANT);
 734 }
 735
 736 bool ChildProcessSecurityPolicyImpl::CanWriteFileSystemFile(
 737     int child_id,
 738     const fileapi::FileSystemURL& url) {
 739   return HasPermissionsForFileSystemFile(child_id, url, WRITE_FILE_GRANT);
 740 }
 741
 742 bool ChildProcessSecurityPolicyImpl::CanCreateFileSystemFile(
 743     int child_id,
 744     const fileapi::FileSystemURL& url) {
 745   return HasPermissionsForFileSystemFile(child_id, url, CREATE_NEW_FILE_GRANT);
 746 }
 747
 748 bool ChildProcessSecurityPolicyImpl::CanCreateReadWriteFileSystemFile(
 749     int child_id,
 750     const fileapi::FileSystemURL& url) {
 751   return HasPermissionsForFileSystemFile(child_id, url,
 752                                          CREATE_READ_WRITE_FILE_GRANT);
 753 }
 754
 755 bool ChildProcessSecurityPolicyImpl::CanCopyIntoFileSystemFile(
 756     int child_id,
 757     const fileapi::FileSystemURL& url) {
 758   return HasPermissionsForFileSystemFile(child_id, url, COPY_INTO_FILE_GRANT);
 759 }
 760
 761 bool ChildProcessSecurityPolicyImpl::CanDeleteFileSystemFile(
 762     int child_id,
 763     const fileapi::FileSystemURL& url) {
 764   return HasPermissionsForFileSystemFile(child_id, url, DELETE_FILE_GRANT);
 765 }
 766
 767 bool ChildProcessSecurityPolicyImpl::HasWebUIBindings(int child_id) {
 768   base::AutoLock lock(lock_);
 769
 770   SecurityStateMap::iterator state = security_state_.find(child_id);
 771   if (state == security_state_.end())
 772     return false;
 773
 774   return state->second->has_web_ui_bindings();
 775 }
 776
 777 bool ChildProcessSecurityPolicyImpl::CanReadRawCookies(int child_id) {
 778   base::AutoLock lock(lock_);
 779
 780   SecurityStateMap::iterator state = security_state_.find(child_id);
 781   if (state == security_state_.end())
 782     return false;
 783
 784   return state->second->can_read_raw_cookies();
 785 }
 786
 787 void ChildProcessSecurityPolicyImpl::AddChild(int child_id) {
 788   if (security_state_.count(child_id) != 0) {
 789     NOTREACHED() << "Add child process at most once.";
 790     return;
 791   }
 792
 793   security_state_[child_id] = new SecurityState();
 794 }
 795
 796 bool ChildProcessSecurityPolicyImpl::ChildProcessHasPermissionsForFile(
 797     int child_id, const base::FilePath& file, int permissions) {
 798   SecurityStateMap::iterator state = security_state_.find(child_id);
 799   if (state == security_state_.end())
 800     return false;
 801   return state->second->HasPermissionsForFile(file, permissions);
 802 }
 803
 804 bool ChildProcessSecurityPolicyImpl::CanAccessCookiesForOrigin(
 805     int child_id, const GURL& gurl) {
 806   base::AutoLock lock(lock_);
 807   SecurityStateMap::iterator state = security_state_.find(child_id);
 808   if (state == security_state_.end())
 809     return false;
 810   return state->second->CanAccessCookiesForOrigin(gurl);
 811 }
 812
 813 bool ChildProcessSecurityPolicyImpl::CanSendCookiesForOrigin(int child_id,
 814                                                              const GURL& gurl) {
 815   for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
 816     if (iter.GetData().id == child_id) {
 817       if (iter.GetData().process_type == PROCESS_TYPE_PLUGIN) {
 818         // NPAPI plugin processes are unsandboxed and so are trusted. Plugins
 819         // can make request to any origin.
 820         return true;
 821       }
 822       break;
 823     }
 824   }
 825
 826   base::AutoLock lock(lock_);
 827   SecurityStateMap::iterator state = security_state_.find(child_id);
 828   if (state == security_state_.end())
 829     return false;
 830   return state->second->CanSendCookiesForOrigin(gurl);
 831 }
 832
 833 void ChildProcessSecurityPolicyImpl::LockToOrigin(int child_id,
 834                                                   const GURL& gurl) {
 835   // "gurl" can be currently empty in some cases, such as file://blah.
 836   DCHECK(SiteInstanceImpl::GetSiteForURL(NULL, gurl) == gurl);
 837   base::AutoLock lock(lock_);
 838   SecurityStateMap::iterator state = security_state_.find(child_id);
 839   DCHECK(state != security_state_.end());
 840   state->second->LockToOrigin(gurl);
 841 }
 842
 843 void ChildProcessSecurityPolicyImpl::GrantPermissionsForFileSystem(
 844     int child_id,
 845     const std::string& filesystem_id,
 846     int permission) {
 847   base::AutoLock lock(lock_);
 848
 849   SecurityStateMap::iterator state = security_state_.find(child_id);
 850   if (state == security_state_.end())
 851     return;
 852   state->second->GrantPermissionsForFileSystem(filesystem_id, permission);
 853 }
 854
 855 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFileSystem(
 856     int child_id,
 857     const std::string& filesystem_id,
 858     int permission) {
 859   base::AutoLock lock(lock_);
 860
 861   SecurityStateMap::iterator state = security_state_.find(child_id);
 862   if (state == security_state_.end())
 863     return false;
 864   return state->second->HasPermissionsForFileSystem(filesystem_id, permission);
 865 }
 866
 867 void ChildProcessSecurityPolicyImpl::RegisterFileSystemPermissionPolicy(
 868     fileapi::FileSystemType type,
 869     int policy) {
 870   base::AutoLock lock(lock_);
 871   file_system_policy_map_[type] = policy;
 872 }
 873
 874 bool ChildProcessSecurityPolicyImpl::CanSendMidiSysExMessage(int child_id) {
 875   base::AutoLock lock(lock_);
 876
 877   SecurityStateMap::iterator state = security_state_.find(child_id);
 878   if (state == security_state_.end())
 879     return false;
 880
 881   return state->second->can_send_midi_sysex();
 882 }
 883
 884 }  // namespace content