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/stl_util.h"
  12 #include "base/strings/string_util.h"
  13 #include "content/browser/plugin_process_host.h"
  14 #include "content/browser/site_instance_impl.h"
  15 #include "content/public/browser/child_process_data.h"
  16 #include "content/public/browser/content_browser_client.h"
  17 #include "content/public/browser/render_process_host.h"
  18 #include "content/public/common/bindings_policy.h"
  19 #include "content/public/common/content_switches.h"
  20 #include "content/public/common/url_constants.h"
  21 #include "net/base/filename_util.h"
  22 #include "net/url_request/url_request.h"
  23 #include "url/gurl.h"
  24 #include "webkit/browser/fileapi/file_permission_policy.h"
  25 #include "webkit/browser/fileapi/file_system_url.h"
  26 #include "webkit/browser/fileapi/isolated_context.h"
  27 #include "webkit/common/fileapi/file_system_util.h"
  28
  29 namespace content {
  30
  31 namespace {
  32
  33 // Used internally only. These bit positions have no relationship to any
  34 // underlying OS and can be changed to accommodate finer-grained permissions.
  35 enum ChildProcessSecurityPermissions {
  36   READ_FILE_PERMISSION             = 1 << 0,
  37   WRITE_FILE_PERMISSION            = 1 << 1,
  38   CREATE_NEW_FILE_PERMISSION       = 1 << 2,
  39   CREATE_OVERWRITE_FILE_PERMISSION = 1 << 3,
  40   DELETE_FILE_PERMISSION           = 1 << 4,
  41
  42   // Used by Media Galleries API
  43   COPY_INTO_FILE_PERMISSION        = 1 << 5,
  44 };
  45
  46 // Used internally only. Bitmasks that are actually used by the Grant* and Can*
  47 // methods. These contain one or more ChildProcessSecurityPermissions.
  48 enum ChildProcessSecurityGrants {
  49   READ_FILE_GRANT              = READ_FILE_PERMISSION,
  50   WRITE_FILE_GRANT             = WRITE_FILE_PERMISSION,
  51
  52   CREATE_NEW_FILE_GRANT        = CREATE_NEW_FILE_PERMISSION |
  53                                  COPY_INTO_FILE_PERMISSION,
  54
  55   CREATE_READ_WRITE_FILE_GRANT = CREATE_NEW_FILE_PERMISSION |
  56                                  CREATE_OVERWRITE_FILE_PERMISSION |
  57                                  READ_FILE_PERMISSION |
  58                                  WRITE_FILE_PERMISSION |
  59                                  COPY_INTO_FILE_PERMISSION |
  60                                  DELETE_FILE_PERMISSION,
  61
  62   COPY_INTO_FILE_GRANT         = COPY_INTO_FILE_PERMISSION,
  63   DELETE_FILE_GRANT            = DELETE_FILE_PERMISSION,
  64 };
  65
  66 }  // namespace
  67
  68 // The SecurityState class is used to maintain per-child process security state
  69 // information.
  70 class ChildProcessSecurityPolicyImpl::SecurityState {
  71  public:
  72   SecurityState()
  73     : enabled_bindings_(0),
  74       can_read_raw_cookies_(false),
  75       can_send_midi_sysex_(false) { }
  76
  77   ~SecurityState() {
  78     scheme_policy_.clear();
  79     fileapi::IsolatedContext* isolated_context =
  80         fileapi::IsolatedContext::GetInstance();
  81     for (FileSystemMap::iterator iter = filesystem_permissions_.begin();
  82          iter != filesystem_permissions_.end();
  83          ++iter) {
  84       isolated_context->RemoveReference(iter->first);
  85     }
  86     UMA_HISTOGRAM_COUNTS("ChildProcessSecurityPolicy.PerChildFilePermissions",
  87                          file_permissions_.size());
  88   }
  89
  90   // Grant permission to request URLs with the specified scheme.
  91   void GrantScheme(const std::string& scheme) {
  92     scheme_policy_[scheme] = true;
  93   }
  94
  95   // Revoke permission to request URLs with the specified scheme.
  96   void RevokeScheme(const std::string& scheme) {
  97     scheme_policy_[scheme] = false;
  98   }
  99
 100   // Grant certain permissions to a file.
 101   void GrantPermissionsForFile(const base::FilePath& file, int permissions) {
 102     base::FilePath stripped = file.StripTrailingSeparators();
 103     file_permissions_[stripped] |= permissions;
 104     UMA_HISTOGRAM_COUNTS("ChildProcessSecurityPolicy.FilePermissionPathLength",
 105                          stripped.value().size());
 106   }
 107
 108   // Grant navigation to a file but not the file:// scheme in general.
 109   void GrantRequestOfSpecificFile(const base::FilePath &file) {
 110     request_file_set_.insert(file.StripTrailingSeparators());
 111   }
 112
 113   // Revokes all permissions granted to a file.
 114   void RevokeAllPermissionsForFile(const base::FilePath& file) {
 115     base::FilePath stripped = file.StripTrailingSeparators();
 116     file_permissions_.erase(stripped);
 117     request_file_set_.erase(stripped);
 118   }
 119
 120   // Grant certain permissions to a file.
 121   void GrantPermissionsForFileSystem(const std::string& filesystem_id,
 122                                      int permissions) {
 123     if (!ContainsKey(filesystem_permissions_, filesystem_id))
 124       fileapi::IsolatedContext::GetInstance()->AddReference(filesystem_id);
 125     filesystem_permissions_[filesystem_id] |= permissions;
 126   }
 127
 128   bool HasPermissionsForFileSystem(const std::string& filesystem_id,
 129                                    int permissions) {
 130     FileSystemMap::const_iterator it =
 131         filesystem_permissions_.find(filesystem_id);
 132     if (it == filesystem_permissions_.end())
 133       return false;
 134     return (it->second & permissions) == permissions;
 135   }
 136
 137 #if defined(OS_ANDROID)
 138   // Determine if the certain permissions have been granted to a content URI.
 139   bool HasPermissionsForContentUri(const base::FilePath& file,
 140                                    int permissions) {
 141     DCHECK(!file.empty());
 142     DCHECK(file.IsContentUri());
 143     if (!permissions)
 144       return false;
 145     base::FilePath file_path = file.StripTrailingSeparators();
 146     FileMap::const_iterator it = file_permissions_.find(file_path);
 147     if (it != file_permissions_.end())
 148       return (it->second & permissions) == permissions;
 149     return false;
 150   }
 151 #endif
 152
 153   void GrantBindings(int bindings) {
 154     enabled_bindings_ |= bindings;
 155   }
 156
 157   void GrantReadRawCookies() {
 158     can_read_raw_cookies_ = true;
 159   }
 160
 161   void RevokeReadRawCookies() {
 162     can_read_raw_cookies_ = false;
 163   }
 164
 165   void GrantPermissionForMidiSysEx() {
 166     can_send_midi_sysex_ = true;
 167   }
 168
 169   // Determine whether permission has been granted to request |url|.
 170   bool CanRequestURL(const GURL& url) {
 171     // Having permission to a scheme implies permssion to all of its URLs.
 172     SchemeMap::const_iterator judgment(scheme_policy_.find(url.scheme()));
 173     if (judgment != scheme_policy_.end())
 174       return judgment->second;
 175
 176     // file:// URLs are more granular.  The child may have been given
 177     // permission to a specific file but not the file:// scheme in general.
 178     if (url.SchemeIs(url::kFileScheme)) {
 179       base::FilePath path;
 180       if (net::FileURLToFilePath(url, &path))
 181         return ContainsKey(request_file_set_, path);
 182     }
 183
 184     return false;  // Unmentioned schemes are disallowed.
 185   }
 186
 187   // Determine if the certain permissions have been granted to a file.
 188   bool HasPermissionsForFile(const base::FilePath& file, int permissions) {
 189 #if defined(OS_ANDROID)
 190     if (file.IsContentUri())
 191       return HasPermissionsForContentUri(file, permissions);
 192 #endif
 193     if (!permissions || file.empty() || !file.IsAbsolute())
 194       return false;
 195     base::FilePath current_path = file.StripTrailingSeparators();
 196     base::FilePath last_path;
 197     int skip = 0;
 198     while (current_path != last_path) {
 199       base::FilePath base_name = current_path.BaseName();
 200       if (base_name.value() == base::FilePath::kParentDirectory) {
 201         ++skip;
 202       } else if (skip > 0) {
 203         if (base_name.value() != base::FilePath::kCurrentDirectory)
 204           --skip;
 205       } else {
 206         FileMap::const_iterator it = file_permissions_.find(current_path);
 207         if (it != file_permissions_.end())
 208           return (it->second & permissions) == permissions;
 209       }
 210       last_path = current_path;
 211       current_path = current_path.DirName();
 212     }
 213
 214     return false;
 215   }
 216
 217   bool CanLoadPage(const GURL& gurl) {
 218     if (origin_lock_.is_empty())
 219       return true;
 220
 221     // TODO(creis): We must pass the valid browser_context to convert hosted
 222     // apps URLs.  Currently, hosted apps cannot be loaded in this mode.
 223     // See http://crbug.com/160576.
 224     GURL site_gurl = SiteInstanceImpl::GetSiteForURL(NULL, gurl);
 225     return origin_lock_ == site_gurl;
 226   }
 227
 228   bool CanAccessCookiesForOrigin(const GURL& gurl) {
 229     if (origin_lock_.is_empty())
 230       return true;
 231     // TODO(creis): We must pass the valid browser_context to convert hosted
 232     // apps URLs.  Currently, hosted apps cannot set cookies in this mode.
 233     // See http://crbug.com/160576.
 234     GURL site_gurl = SiteInstanceImpl::GetSiteForURL(NULL, gurl);
 235     return origin_lock_ == site_gurl;
 236   }
 237
 238   bool CanSendCookiesForOrigin(const GURL& gurl) {
 239     // We only block cross-site cookies on network requests if the
 240     // --enable-strict-site-isolation flag is passed.  This is expected to break
 241     // compatibility with many sites.  The similar --site-per-process flag only
 242     // blocks JavaScript access to cross-site cookies (in
 243     // CanAccessCookiesForOrigin).
 244     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 245     if (!command_line.HasSwitch(switches::kEnableStrictSiteIsolation))
 246       return true;
 247
 248     if (origin_lock_.is_empty())
 249       return true;
 250     // TODO(creis): We must pass the valid browser_context to convert hosted
 251     // apps URLs.  Currently, hosted apps cannot set cookies in this mode.
 252     // See http://crbug.com/160576.
 253     GURL site_gurl = SiteInstanceImpl::GetSiteForURL(NULL, gurl);
 254     return origin_lock_ == site_gurl;
 255   }
 256
 257   void LockToOrigin(const GURL& gurl) {
 258     origin_lock_ = gurl;
 259   }
 260
 261   bool has_web_ui_bindings() const {
 262     return enabled_bindings_ & BINDINGS_POLICY_WEB_UI;
 263   }
 264
 265   bool can_read_raw_cookies() const {
 266     return can_read_raw_cookies_;
 267   }
 268
 269   bool can_send_midi_sysex() const {
 270     return can_send_midi_sysex_;
 271   }
 272
 273  private:
 274   typedef std::map<std::string, bool> SchemeMap;
 275
 276   typedef int FilePermissionFlags;  // bit-set of base::File::Flags
 277   typedef std::map<base::FilePath, FilePermissionFlags> FileMap;
 278   typedef std::map<std::string, FilePermissionFlags> FileSystemMap;
 279   typedef std::set<base::FilePath> FileSet;
 280
 281   // Maps URL schemes to whether permission has been granted or revoked:
 282   //   |true| means the scheme has been granted.
 283   //   |false| means the scheme has been revoked.
 284   // If a scheme is not present in the map, then it has never been granted
 285   // or revoked.
 286   SchemeMap scheme_policy_;
 287
 288   // The set of files the child process is permited to upload to the web.
 289   FileMap file_permissions_;
 290
 291   // The set of files the child process is permitted to load.
 292   FileSet request_file_set_;
 293
 294   int enabled_bindings_;
 295
 296   bool can_read_raw_cookies_;
 297
 298   bool can_send_midi_sysex_;
 299
 300   GURL origin_lock_;
 301
 302   // The set of isolated filesystems the child process is permitted to access.
 303   FileSystemMap filesystem_permissions_;
 304
 305   DISALLOW_COPY_AND_ASSIGN(SecurityState);
 306 };
 307
 308 ChildProcessSecurityPolicyImpl::ChildProcessSecurityPolicyImpl() {
 309   // We know about these schemes and believe them to be safe.
 310   RegisterWebSafeScheme(url::kHttpScheme);
 311   RegisterWebSafeScheme(url::kHttpsScheme);
 312   RegisterWebSafeScheme(url::kFtpScheme);
 313   RegisterWebSafeScheme(url::kDataScheme);
 314   RegisterWebSafeScheme("feed");
 315   RegisterWebSafeScheme(url::kBlobScheme);
 316   RegisterWebSafeScheme(url::kFileSystemScheme);
 317
 318   // We know about the following pseudo schemes and treat them specially.
 319   RegisterPseudoScheme(url::kAboutScheme);
 320   RegisterPseudoScheme(url::kJavaScriptScheme);
 321   RegisterPseudoScheme(kViewSourceScheme);
 322 }
 323
 324 ChildProcessSecurityPolicyImpl::~ChildProcessSecurityPolicyImpl() {
 325   web_safe_schemes_.clear();
 326   pseudo_schemes_.clear();
 327   STLDeleteContainerPairSecondPointers(security_state_.begin(),
 328                                        security_state_.end());
 329   security_state_.clear();
 330 }
 331
 332 // static
 333 ChildProcessSecurityPolicy* ChildProcessSecurityPolicy::GetInstance() {
 334   return ChildProcessSecurityPolicyImpl::GetInstance();
 335 }
 336
 337 ChildProcessSecurityPolicyImpl* ChildProcessSecurityPolicyImpl::GetInstance() {
 338   return Singleton<ChildProcessSecurityPolicyImpl>::get();
 339 }
 340
 341 void ChildProcessSecurityPolicyImpl::Add(int child_id) {
 342   base::AutoLock lock(lock_);
 343   AddChild(child_id);
 344 }
 345
 346 void ChildProcessSecurityPolicyImpl::AddWorker(int child_id,
 347                                                int main_render_process_id) {
 348   base::AutoLock lock(lock_);
 349   AddChild(child_id);
 350   worker_map_[child_id] = main_render_process_id;
 351 }
 352
 353 void ChildProcessSecurityPolicyImpl::Remove(int child_id) {
 354   base::AutoLock lock(lock_);
 355   SecurityStateMap::iterator it = security_state_.find(child_id);
 356   if (it == security_state_.end())
 357     return;  // May be called multiple times.
 358
 359   delete it->second;
 360   security_state_.erase(it);
 361   worker_map_.erase(child_id);
 362 }
 363
 364 void ChildProcessSecurityPolicyImpl::RegisterWebSafeScheme(
 365     const std::string& scheme) {
 366   base::AutoLock lock(lock_);
 367   DCHECK_EQ(0U, web_safe_schemes_.count(scheme)) << "Add schemes at most once.";
 368   DCHECK_EQ(0U, pseudo_schemes_.count(scheme))
 369       << "Web-safe implies not pseudo.";
 370
 371   web_safe_schemes_.insert(scheme);
 372 }
 373
 374 bool ChildProcessSecurityPolicyImpl::IsWebSafeScheme(
 375     const std::string& scheme) {
 376   base::AutoLock lock(lock_);
 377
 378   return ContainsKey(web_safe_schemes_, scheme);
 379 }
 380
 381 void ChildProcessSecurityPolicyImpl::RegisterPseudoScheme(
 382     const std::string& scheme) {
 383   base::AutoLock lock(lock_);
 384   DCHECK_EQ(0U, pseudo_schemes_.count(scheme)) << "Add schemes at most once.";
 385   DCHECK_EQ(0U, web_safe_schemes_.count(scheme))
 386       << "Pseudo implies not web-safe.";
 387
 388   pseudo_schemes_.insert(scheme);
 389 }
 390
 391 bool ChildProcessSecurityPolicyImpl::IsPseudoScheme(
 392     const std::string& scheme) {
 393   base::AutoLock lock(lock_);
 394
 395   return ContainsKey(pseudo_schemes_, scheme);
 396 }
 397
 398 void ChildProcessSecurityPolicyImpl::GrantRequestURL(
 399     int child_id, const GURL& url) {
 400
 401   if (!url.is_valid())
 402     return;  // Can't grant the capability to request invalid URLs.
 403
 404   if (IsWebSafeScheme(url.scheme()))
 405     return;  // The scheme has already been whitelisted for every child process.
 406
 407   if (IsPseudoScheme(url.scheme())) {
 408     // The view-source scheme is a special case of a pseudo-URL that eventually
 409     // results in requesting its embedded URL.
 410     if (url.SchemeIs(kViewSourceScheme)) {
 411       // URLs with the view-source scheme typically look like:
 412       //   view-source:http://www.google.com/a
 413       // In order to request these URLs, the child_id needs to be able to
 414       // request the embedded URL.
 415       GrantRequestURL(child_id, GURL(url.GetContent()));
 416     }
 417
 418     return;  // Can't grant the capability to request pseudo schemes.
 419   }
 420
 421   {
 422     base::AutoLock lock(lock_);
 423     SecurityStateMap::iterator state = security_state_.find(child_id);
 424     if (state == security_state_.end())
 425       return;
 426
 427     // When the child process has been commanded to request this scheme,
 428     // we grant it the capability to request all URLs of that scheme.
 429     state->second->GrantScheme(url.scheme());
 430   }
 431 }
 432
 433 void ChildProcessSecurityPolicyImpl::GrantRequestSpecificFileURL(
 434     int child_id,
 435     const GURL& url) {
 436   if (!url.SchemeIs(url::kFileScheme))
 437     return;
 438
 439   {
 440     base::AutoLock lock(lock_);
 441     SecurityStateMap::iterator state = security_state_.find(child_id);
 442     if (state == security_state_.end())
 443       return;
 444
 445     // When the child process has been commanded to request a file:// URL,
 446     // then we grant it the capability for that URL only.
 447     base::FilePath path;
 448     if (net::FileURLToFilePath(url, &path))
 449       state->second->GrantRequestOfSpecificFile(path);
 450   }
 451 }
 452
 453 void ChildProcessSecurityPolicyImpl::GrantReadFile(int child_id,
 454                                                    const base::FilePath& file) {
 455   GrantPermissionsForFile(child_id, file, READ_FILE_GRANT);
 456 }
 457
 458 void ChildProcessSecurityPolicyImpl::GrantCreateReadWriteFile(
 459     int child_id, const base::FilePath& file) {
 460   GrantPermissionsForFile(child_id, file, CREATE_READ_WRITE_FILE_GRANT);
 461 }
 462
 463 void ChildProcessSecurityPolicyImpl::GrantCopyInto(int child_id,
 464                                                    const base::FilePath& dir) {
 465   GrantPermissionsForFile(child_id, dir, COPY_INTO_FILE_GRANT);
 466 }
 467
 468 void ChildProcessSecurityPolicyImpl::GrantDeleteFrom(
 469     int child_id, const base::FilePath& dir) {
 470   GrantPermissionsForFile(child_id, dir, DELETE_FILE_GRANT);
 471 }
 472
 473 void ChildProcessSecurityPolicyImpl::GrantPermissionsForFile(
 474     int child_id, const base::FilePath& file, int permissions) {
 475   base::AutoLock lock(lock_);
 476
 477   SecurityStateMap::iterator state = security_state_.find(child_id);
 478   if (state == security_state_.end())
 479     return;
 480
 481   state->second->GrantPermissionsForFile(file, permissions);
 482 }
 483
 484 void ChildProcessSecurityPolicyImpl::RevokeAllPermissionsForFile(
 485     int child_id, const base::FilePath& file) {
 486   base::AutoLock lock(lock_);
 487
 488   SecurityStateMap::iterator state = security_state_.find(child_id);
 489   if (state == security_state_.end())
 490     return;
 491
 492   state->second->RevokeAllPermissionsForFile(file);
 493 }
 494
 495 void ChildProcessSecurityPolicyImpl::GrantReadFileSystem(
 496     int child_id, const std::string& filesystem_id) {
 497   GrantPermissionsForFileSystem(child_id, filesystem_id, READ_FILE_GRANT);
 498 }
 499
 500 void ChildProcessSecurityPolicyImpl::GrantWriteFileSystem(
 501     int child_id, const std::string& filesystem_id) {
 502   GrantPermissionsForFileSystem(child_id, filesystem_id, WRITE_FILE_GRANT);
 503 }
 504
 505 void ChildProcessSecurityPolicyImpl::GrantCreateFileForFileSystem(
 506     int child_id, const std::string& filesystem_id) {
 507   GrantPermissionsForFileSystem(child_id, filesystem_id, CREATE_NEW_FILE_GRANT);
 508 }
 509
 510 void ChildProcessSecurityPolicyImpl::GrantCreateReadWriteFileSystem(
 511     int child_id, const std::string& filesystem_id) {
 512   GrantPermissionsForFileSystem(
 513       child_id, filesystem_id, CREATE_READ_WRITE_FILE_GRANT);
 514 }
 515
 516 void ChildProcessSecurityPolicyImpl::GrantCopyIntoFileSystem(
 517     int child_id, const std::string& filesystem_id) {
 518   GrantPermissionsForFileSystem(child_id, filesystem_id, COPY_INTO_FILE_GRANT);
 519 }
 520
 521 void ChildProcessSecurityPolicyImpl::GrantDeleteFromFileSystem(
 522     int child_id, const std::string& filesystem_id) {
 523   GrantPermissionsForFileSystem(child_id, filesystem_id, DELETE_FILE_GRANT);
 524 }
 525
 526 void ChildProcessSecurityPolicyImpl::GrantSendMidiSysExMessage(int child_id) {
 527   base::AutoLock lock(lock_);
 528
 529   SecurityStateMap::iterator state = security_state_.find(child_id);
 530   if (state == security_state_.end())
 531     return;
 532
 533   state->second->GrantPermissionForMidiSysEx();
 534 }
 535
 536 void ChildProcessSecurityPolicyImpl::GrantScheme(int child_id,
 537                                                  const std::string& scheme) {
 538   base::AutoLock lock(lock_);
 539
 540   SecurityStateMap::iterator state = security_state_.find(child_id);
 541   if (state == security_state_.end())
 542     return;
 543
 544   state->second->GrantScheme(scheme);
 545 }
 546
 547 void ChildProcessSecurityPolicyImpl::GrantWebUIBindings(int child_id) {
 548   base::AutoLock lock(lock_);
 549
 550   SecurityStateMap::iterator state = security_state_.find(child_id);
 551   if (state == security_state_.end())
 552     return;
 553
 554   state->second->GrantBindings(BINDINGS_POLICY_WEB_UI);
 555
 556   // Web UI bindings need the ability to request chrome: URLs.
 557   state->second->GrantScheme(kChromeUIScheme);
 558
 559   // Web UI pages can contain links to file:// URLs.
 560   state->second->GrantScheme(url::kFileScheme);
 561 }
 562
 563 void ChildProcessSecurityPolicyImpl::GrantReadRawCookies(int child_id) {
 564   base::AutoLock lock(lock_);
 565
 566   SecurityStateMap::iterator state = security_state_.find(child_id);
 567   if (state == security_state_.end())
 568     return;
 569
 570   state->second->GrantReadRawCookies();
 571 }
 572
 573 void ChildProcessSecurityPolicyImpl::RevokeReadRawCookies(int child_id) {
 574   base::AutoLock lock(lock_);
 575
 576   SecurityStateMap::iterator state = security_state_.find(child_id);
 577   if (state == security_state_.end())
 578     return;
 579
 580   state->second->RevokeReadRawCookies();
 581 }
 582
 583 bool ChildProcessSecurityPolicyImpl::CanLoadPage(
 584     int child_id,
 585     const GURL& url,
 586     ResourceType::Type resource_type) {
 587   // If --site-per-process flag is passed, we should enforce
 588   // stronger security restrictions on page navigation.
 589   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess) &&
 590       ResourceType::IsFrame(resource_type)) {
 591     // TODO(nasko): Do the proper check for site-per-process, once
 592     // out-of-process iframes is ready to go.
 593     return true;
 594   }
 595   return true;
 596 }
 597
 598 bool ChildProcessSecurityPolicyImpl::CanRequestURL(
 599     int child_id, const GURL& url) {
 600   if (!url.is_valid())
 601     return false;  // Can't request invalid URLs.
 602
 603   if (IsWebSafeScheme(url.scheme()))
 604     return true;  // The scheme has been white-listed for every child process.
 605
 606   if (IsPseudoScheme(url.scheme())) {
 607     // There are a number of special cases for pseudo schemes.
 608
 609     if (url.SchemeIs(kViewSourceScheme)) {
 610       // A view-source URL is allowed if the child process is permitted to
 611       // request the embedded URL. Careful to avoid pointless recursion.
 612       GURL child_url(url.GetContent());
 613       if (child_url.SchemeIs(kViewSourceScheme) &&
 614           url.SchemeIs(kViewSourceScheme))
 615           return false;
 616
 617       return CanRequestURL(child_id, child_url);
 618     }
 619
 620     if (LowerCaseEqualsASCII(url.spec(), url::kAboutBlankURL))
 621       return true;  // Every child process can request <about:blank>.
 622
 623     // URLs like <about:memory> and <about:crash> shouldn't be requestable by
 624     // any child process.  Also, this case covers <javascript:...>, which should
 625     // be handled internally by the process and not kicked up to the browser.
 626     return false;
 627   }
 628
 629   if (!GetContentClient()->browser()->IsHandledURL(url) &&
 630       !net::URLRequest::IsHandledURL(url)) {
 631     return true;  // This URL request is destined for ShellExecute.
 632   }
 633
 634   {
 635     base::AutoLock lock(lock_);
 636
 637     SecurityStateMap::iterator state = security_state_.find(child_id);
 638     if (state == security_state_.end())
 639       return false;
 640
 641     // Otherwise, we consult the child process's security state to see if it is
 642     // allowed to request the URL.
 643     return state->second->CanRequestURL(url);
 644   }
 645 }
 646
 647 bool ChildProcessSecurityPolicyImpl::CanReadFile(int child_id,
 648                                                  const base::FilePath& file) {
 649   return HasPermissionsForFile(child_id, file, READ_FILE_GRANT);
 650 }
 651
 652 bool ChildProcessSecurityPolicyImpl::CanCreateReadWriteFile(
 653     int child_id,
 654     const base::FilePath& file) {
 655   return HasPermissionsForFile(child_id, file, CREATE_READ_WRITE_FILE_GRANT);
 656 }
 657
 658 bool ChildProcessSecurityPolicyImpl::CanReadFileSystem(
 659     int child_id, const std::string& filesystem_id) {
 660   return HasPermissionsForFileSystem(child_id, filesystem_id, READ_FILE_GRANT);
 661 }
 662
 663 bool ChildProcessSecurityPolicyImpl::CanReadWriteFileSystem(
 664     int child_id, const std::string& filesystem_id) {
 665   return HasPermissionsForFileSystem(child_id, filesystem_id,
 666                                      READ_FILE_GRANT | WRITE_FILE_GRANT);
 667 }
 668
 669 bool ChildProcessSecurityPolicyImpl::CanCopyIntoFileSystem(
 670     int child_id, const std::string& filesystem_id) {
 671   return HasPermissionsForFileSystem(child_id, filesystem_id,
 672                                      COPY_INTO_FILE_GRANT);
 673 }
 674
 675 bool ChildProcessSecurityPolicyImpl::CanDeleteFromFileSystem(
 676     int child_id, const std::string& filesystem_id) {
 677   return HasPermissionsForFileSystem(child_id, filesystem_id,
 678                                      DELETE_FILE_GRANT);
 679 }
 680
 681 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFile(
 682     int child_id, const base::FilePath& file, int permissions) {
 683   base::AutoLock lock(lock_);
 684   bool result = ChildProcessHasPermissionsForFile(child_id, file, permissions);
 685   if (!result) {
 686     // If this is a worker thread that has no access to a given file,
 687     // let's check that its renderer process has access to that file instead.
 688     WorkerToMainProcessMap::iterator iter = worker_map_.find(child_id);
 689     if (iter != worker_map_.end() && iter->second != 0) {
 690       result = ChildProcessHasPermissionsForFile(iter->second,
 691                                                  file,
 692                                                  permissions);
 693     }
 694   }
 695   return result;
 696 }
 697
 698 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFileSystemFile(
 699     int child_id, const fileapi::FileSystemURL& url, int permissions) {
 700   if (!url.is_valid())
 701     return false;
 702
 703   if (url.path().ReferencesParent())
 704     return false;
 705
 706   // Any write access is disallowed on the root path.
 707   if (fileapi::VirtualPath::IsRootPath(url.path()) &&
 708       (permissions & ~READ_FILE_GRANT)) {
 709     return false;
 710   }
 711
 712   if (url.mount_type() == fileapi::kFileSystemTypeIsolated) {
 713     // When Isolated filesystems is overlayed on top of another filesystem,
 714     // its per-filesystem permission overrides the underlying filesystem
 715     // permissions).
 716     return HasPermissionsForFileSystem(
 717         child_id, url.mount_filesystem_id(), permissions);
 718   }
 719
 720   FileSystemPermissionPolicyMap::iterator found =
 721       file_system_policy_map_.find(url.type());
 722   if (found == file_system_policy_map_.end())
 723     return false;
 724
 725   if ((found->second & fileapi::FILE_PERMISSION_READ_ONLY) &&
 726       permissions & ~READ_FILE_GRANT) {
 727     return false;
 728   }
 729
 730   if (found->second & fileapi::FILE_PERMISSION_USE_FILE_PERMISSION)
 731     return HasPermissionsForFile(child_id, url.path(), permissions);
 732
 733   if (found->second & fileapi::FILE_PERMISSION_SANDBOX)
 734     return true;
 735
 736   return false;
 737 }
 738
 739 bool ChildProcessSecurityPolicyImpl::CanReadFileSystemFile(
 740     int child_id,
 741     const fileapi::FileSystemURL& url) {
 742   return HasPermissionsForFileSystemFile(child_id, url, READ_FILE_GRANT);
 743 }
 744
 745 bool ChildProcessSecurityPolicyImpl::CanWriteFileSystemFile(
 746     int child_id,
 747     const fileapi::FileSystemURL& url) {
 748   return HasPermissionsForFileSystemFile(child_id, url, WRITE_FILE_GRANT);
 749 }
 750
 751 bool ChildProcessSecurityPolicyImpl::CanCreateFileSystemFile(
 752     int child_id,
 753     const fileapi::FileSystemURL& url) {
 754   return HasPermissionsForFileSystemFile(child_id, url, CREATE_NEW_FILE_GRANT);
 755 }
 756
 757 bool ChildProcessSecurityPolicyImpl::CanCreateReadWriteFileSystemFile(
 758     int child_id,
 759     const fileapi::FileSystemURL& url) {
 760   return HasPermissionsForFileSystemFile(child_id, url,
 761                                          CREATE_READ_WRITE_FILE_GRANT);
 762 }
 763
 764 bool ChildProcessSecurityPolicyImpl::CanCopyIntoFileSystemFile(
 765     int child_id,
 766     const fileapi::FileSystemURL& url) {
 767   return HasPermissionsForFileSystemFile(child_id, url, COPY_INTO_FILE_GRANT);
 768 }
 769
 770 bool ChildProcessSecurityPolicyImpl::CanDeleteFileSystemFile(
 771     int child_id,
 772     const fileapi::FileSystemURL& url) {
 773   return HasPermissionsForFileSystemFile(child_id, url, DELETE_FILE_GRANT);
 774 }
 775
 776 bool ChildProcessSecurityPolicyImpl::HasWebUIBindings(int child_id) {
 777   base::AutoLock lock(lock_);
 778
 779   SecurityStateMap::iterator state = security_state_.find(child_id);
 780   if (state == security_state_.end())
 781     return false;
 782
 783   return state->second->has_web_ui_bindings();
 784 }
 785
 786 bool ChildProcessSecurityPolicyImpl::CanReadRawCookies(int child_id) {
 787   base::AutoLock lock(lock_);
 788
 789   SecurityStateMap::iterator state = security_state_.find(child_id);
 790   if (state == security_state_.end())
 791     return false;
 792
 793   return state->second->can_read_raw_cookies();
 794 }
 795
 796 void ChildProcessSecurityPolicyImpl::AddChild(int child_id) {
 797   if (security_state_.count(child_id) != 0) {
 798     NOTREACHED() << "Add child process at most once.";
 799     return;
 800   }
 801
 802   security_state_[child_id] = new SecurityState();
 803 }
 804
 805 bool ChildProcessSecurityPolicyImpl::ChildProcessHasPermissionsForFile(
 806     int child_id, const base::FilePath& file, int permissions) {
 807   SecurityStateMap::iterator state = security_state_.find(child_id);
 808   if (state == security_state_.end())
 809     return false;
 810   return state->second->HasPermissionsForFile(file, permissions);
 811 }
 812
 813 bool ChildProcessSecurityPolicyImpl::CanAccessCookiesForOrigin(
 814     int child_id, const GURL& gurl) {
 815   base::AutoLock lock(lock_);
 816   SecurityStateMap::iterator state = security_state_.find(child_id);
 817   if (state == security_state_.end())
 818     return false;
 819   return state->second->CanAccessCookiesForOrigin(gurl);
 820 }
 821
 822 bool ChildProcessSecurityPolicyImpl::CanSendCookiesForOrigin(int child_id,
 823                                                              const GURL& gurl) {
 824   for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
 825     if (iter.GetData().id == child_id) {
 826       if (iter.GetData().process_type == PROCESS_TYPE_PLUGIN) {
 827         // NPAPI plugin processes are unsandboxed and so are trusted. Plugins
 828         // can make request to any origin.
 829         return true;
 830       }
 831       break;
 832     }
 833   }
 834
 835   base::AutoLock lock(lock_);
 836   SecurityStateMap::iterator state = security_state_.find(child_id);
 837   if (state == security_state_.end())
 838     return false;
 839   return state->second->CanSendCookiesForOrigin(gurl);
 840 }
 841
 842 void ChildProcessSecurityPolicyImpl::LockToOrigin(int child_id,
 843                                                   const GURL& gurl) {
 844   // "gurl" can be currently empty in some cases, such as file://blah.
 845   DCHECK(SiteInstanceImpl::GetSiteForURL(NULL, gurl) == gurl);
 846   base::AutoLock lock(lock_);
 847   SecurityStateMap::iterator state = security_state_.find(child_id);
 848   DCHECK(state != security_state_.end());
 849   state->second->LockToOrigin(gurl);
 850 }
 851
 852 void ChildProcessSecurityPolicyImpl::GrantPermissionsForFileSystem(
 853     int child_id,
 854     const std::string& filesystem_id,
 855     int permission) {
 856   base::AutoLock lock(lock_);
 857
 858   SecurityStateMap::iterator state = security_state_.find(child_id);
 859   if (state == security_state_.end())
 860     return;
 861   state->second->GrantPermissionsForFileSystem(filesystem_id, permission);
 862 }
 863
 864 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFileSystem(
 865     int child_id,
 866     const std::string& filesystem_id,
 867     int permission) {
 868   base::AutoLock lock(lock_);
 869
 870   SecurityStateMap::iterator state = security_state_.find(child_id);
 871   if (state == security_state_.end())
 872     return false;
 873   return state->second->HasPermissionsForFileSystem(filesystem_id, permission);
 874 }
 875
 876 void ChildProcessSecurityPolicyImpl::RegisterFileSystemPermissionPolicy(
 877     fileapi::FileSystemType type,
 878     int policy) {
 879   base::AutoLock lock(lock_);
 880   file_system_policy_map_[type] = policy;
 881 }
 882
 883 bool ChildProcessSecurityPolicyImpl::CanSendMidiSysExMessage(int child_id) {
 884   base::AutoLock lock(lock_);
 885
 886   SecurityStateMap::iterator state = security_state_.find(child_id);
 887   if (state == security_state_.end())
 888     return false;
 889
 890   return state->second->can_send_midi_sysex();
 891 }
 892
 893 }  // namespace content