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 base::CommandLine& command_line =
 245         *base::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 base::File::Flags
 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(url::kHttpScheme);
 312   RegisterWebSafeScheme(url::kHttpsScheme);
 313   RegisterWebSafeScheme(url::kFtpScheme);
 314   RegisterWebSafeScheme(url::kDataScheme);
 315   RegisterWebSafeScheme("feed");
 316   RegisterWebSafeScheme(url::kBlobScheme);
 317   RegisterWebSafeScheme(url::kFileSystemScheme);
 318
 319   // We know about the following pseudo schemes and treat them specially.
 320   RegisterPseudoScheme(url::kAboutScheme);
 321   RegisterPseudoScheme(url::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(url::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::GrantCopyInto(int child_id,
 465                                                    const base::FilePath& dir) {
 466   GrantPermissionsForFile(child_id, dir, COPY_INTO_FILE_GRANT);
 467 }
 468
 469 void ChildProcessSecurityPolicyImpl::GrantDeleteFrom(
 470     int child_id, const base::FilePath& dir) {
 471   GrantPermissionsForFile(child_id, dir, DELETE_FILE_GRANT);
 472 }
 473
 474 void ChildProcessSecurityPolicyImpl::GrantPermissionsForFile(
 475     int child_id, const base::FilePath& file, int permissions) {
 476   base::AutoLock lock(lock_);
 477
 478   SecurityStateMap::iterator state = security_state_.find(child_id);
 479   if (state == security_state_.end())
 480     return;
 481
 482   state->second->GrantPermissionsForFile(file, permissions);
 483 }
 484
 485 void ChildProcessSecurityPolicyImpl::RevokeAllPermissionsForFile(
 486     int child_id, const base::FilePath& file) {
 487   base::AutoLock lock(lock_);
 488
 489   SecurityStateMap::iterator state = security_state_.find(child_id);
 490   if (state == security_state_.end())
 491     return;
 492
 493   state->second->RevokeAllPermissionsForFile(file);
 494 }
 495
 496 void ChildProcessSecurityPolicyImpl::GrantReadFileSystem(
 497     int child_id, const std::string& filesystem_id) {
 498   GrantPermissionsForFileSystem(child_id, filesystem_id, READ_FILE_GRANT);
 499 }
 500
 501 void ChildProcessSecurityPolicyImpl::GrantWriteFileSystem(
 502     int child_id, const std::string& filesystem_id) {
 503   GrantPermissionsForFileSystem(child_id, filesystem_id, WRITE_FILE_GRANT);
 504 }
 505
 506 void ChildProcessSecurityPolicyImpl::GrantCreateFileForFileSystem(
 507     int child_id, const std::string& filesystem_id) {
 508   GrantPermissionsForFileSystem(child_id, filesystem_id, CREATE_NEW_FILE_GRANT);
 509 }
 510
 511 void ChildProcessSecurityPolicyImpl::GrantCreateReadWriteFileSystem(
 512     int child_id, const std::string& filesystem_id) {
 513   GrantPermissionsForFileSystem(
 514       child_id, filesystem_id, CREATE_READ_WRITE_FILE_GRANT);
 515 }
 516
 517 void ChildProcessSecurityPolicyImpl::GrantCopyIntoFileSystem(
 518     int child_id, const std::string& filesystem_id) {
 519   GrantPermissionsForFileSystem(child_id, filesystem_id, COPY_INTO_FILE_GRANT);
 520 }
 521
 522 void ChildProcessSecurityPolicyImpl::GrantDeleteFromFileSystem(
 523     int child_id, const std::string& filesystem_id) {
 524   GrantPermissionsForFileSystem(child_id, filesystem_id, DELETE_FILE_GRANT);
 525 }
 526
 527 void ChildProcessSecurityPolicyImpl::GrantSendMidiSysExMessage(int child_id) {
 528   base::AutoLock lock(lock_);
 529
 530   SecurityStateMap::iterator state = security_state_.find(child_id);
 531   if (state == security_state_.end())
 532     return;
 533
 534   state->second->GrantPermissionForMidiSysEx();
 535 }
 536
 537 void ChildProcessSecurityPolicyImpl::GrantScheme(int child_id,
 538                                                  const std::string& scheme) {
 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->GrantScheme(scheme);
 546 }
 547
 548 void ChildProcessSecurityPolicyImpl::GrantWebUIBindings(int child_id) {
 549   base::AutoLock lock(lock_);
 550
 551   SecurityStateMap::iterator state = security_state_.find(child_id);
 552   if (state == security_state_.end())
 553     return;
 554
 555   state->second->GrantBindings(BINDINGS_POLICY_WEB_UI);
 556
 557   // Web UI bindings need the ability to request chrome: URLs.
 558   state->second->GrantScheme(kChromeUIScheme);
 559
 560   // Web UI pages can contain links to file:// URLs.
 561   state->second->GrantScheme(url::kFileScheme);
 562 }
 563
 564 void ChildProcessSecurityPolicyImpl::GrantReadRawCookies(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->GrantReadRawCookies();
 572 }
 573
 574 void ChildProcessSecurityPolicyImpl::RevokeReadRawCookies(int child_id) {
 575   base::AutoLock lock(lock_);
 576
 577   SecurityStateMap::iterator state = security_state_.find(child_id);
 578   if (state == security_state_.end())
 579     return;
 580
 581   state->second->RevokeReadRawCookies();
 582 }
 583
 584 bool ChildProcessSecurityPolicyImpl::CanLoadPage(int child_id,
 585                                                  const GURL& url,
 586                                                  ResourceType resource_type) {
 587   // If --site-per-process flag is passed, we should enforce
 588   // stronger security restrictions on page navigation.
 589   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 590           switches::kSitePerProcess) &&
 591       IsResourceTypeFrame(resource_type)) {
 592     // TODO(nasko): Do the proper check for site-per-process, once
 593     // out-of-process iframes is ready to go.
 594     return true;
 595   }
 596   return true;
 597 }
 598
 599 bool ChildProcessSecurityPolicyImpl::CanRequestURL(
 600     int child_id, const GURL& url) {
 601   if (!url.is_valid())
 602     return false;  // Can't request invalid URLs.
 603
 604   if (IsWebSafeScheme(url.scheme()))
 605     return true;  // The scheme has been white-listed for every child process.
 606
 607   if (IsPseudoScheme(url.scheme())) {
 608     // There are a number of special cases for pseudo schemes.
 609
 610     if (url.SchemeIs(kViewSourceScheme)) {
 611       // A view-source URL is allowed if the child process is permitted to
 612       // request the embedded URL. Careful to avoid pointless recursion.
 613       GURL child_url(url.GetContent());
 614       if (child_url.SchemeIs(kViewSourceScheme) &&
 615           url.SchemeIs(kViewSourceScheme))
 616           return false;
 617
 618       return CanRequestURL(child_id, child_url);
 619     }
 620
 621     if (LowerCaseEqualsASCII(url.spec(), url::kAboutBlankURL))
 622       return true;  // Every child process can request <about:blank>.
 623
 624     // URLs like <about:memory> and <about:crash> shouldn't be requestable by
 625     // any child process.  Also, this case covers <javascript:...>, which should
 626     // be handled internally by the process and not kicked up to the browser.
 627     return false;
 628   }
 629
 630   if (!GetContentClient()->browser()->IsHandledURL(url) &&
 631       !net::URLRequest::IsHandledURL(url)) {
 632     return true;  // This URL request is destined for ShellExecute.
 633   }
 634
 635   {
 636     base::AutoLock lock(lock_);
 637
 638     SecurityStateMap::iterator state = security_state_.find(child_id);
 639     if (state == security_state_.end())
 640       return false;
 641
 642     // Otherwise, we consult the child process's security state to see if it is
 643     // allowed to request the URL.
 644     return state->second->CanRequestURL(url);
 645   }
 646 }
 647
 648 bool ChildProcessSecurityPolicyImpl::CanReadFile(int child_id,
 649                                                  const base::FilePath& file) {
 650   return HasPermissionsForFile(child_id, file, READ_FILE_GRANT);
 651 }
 652
 653 bool ChildProcessSecurityPolicyImpl::CanCreateReadWriteFile(
 654     int child_id,
 655     const base::FilePath& file) {
 656   return HasPermissionsForFile(child_id, file, CREATE_READ_WRITE_FILE_GRANT);
 657 }
 658
 659 bool ChildProcessSecurityPolicyImpl::CanReadFileSystem(
 660     int child_id, const std::string& filesystem_id) {
 661   return HasPermissionsForFileSystem(child_id, filesystem_id, READ_FILE_GRANT);
 662 }
 663
 664 bool ChildProcessSecurityPolicyImpl::CanReadWriteFileSystem(
 665     int child_id, const std::string& filesystem_id) {
 666   return HasPermissionsForFileSystem(child_id, filesystem_id,
 667                                      READ_FILE_GRANT | WRITE_FILE_GRANT);
 668 }
 669
 670 bool ChildProcessSecurityPolicyImpl::CanCopyIntoFileSystem(
 671     int child_id, const std::string& filesystem_id) {
 672   return HasPermissionsForFileSystem(child_id, filesystem_id,
 673                                      COPY_INTO_FILE_GRANT);
 674 }
 675
 676 bool ChildProcessSecurityPolicyImpl::CanDeleteFromFileSystem(
 677     int child_id, const std::string& filesystem_id) {
 678   return HasPermissionsForFileSystem(child_id, filesystem_id,
 679                                      DELETE_FILE_GRANT);
 680 }
 681
 682 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFile(
 683     int child_id, const base::FilePath& file, int permissions) {
 684   base::AutoLock lock(lock_);
 685   bool result = ChildProcessHasPermissionsForFile(child_id, file, permissions);
 686   if (!result) {
 687     // If this is a worker thread that has no access to a given file,
 688     // let's check that its renderer process has access to that file instead.
 689     WorkerToMainProcessMap::iterator iter = worker_map_.find(child_id);
 690     if (iter != worker_map_.end() && iter->second != 0) {
 691       result = ChildProcessHasPermissionsForFile(iter->second,
 692                                                  file,
 693                                                  permissions);
 694     }
 695   }
 696   return result;
 697 }
 698
 699 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFileSystemFile(
 700     int child_id, const fileapi::FileSystemURL& url, int permissions) {
 701   if (!url.is_valid())
 702     return false;
 703
 704   if (url.path().ReferencesParent())
 705     return false;
 706
 707   // Any write access is disallowed on the root path.
 708   if (fileapi::VirtualPath::IsRootPath(url.path()) &&
 709       (permissions & ~READ_FILE_GRANT)) {
 710     return false;
 711   }
 712
 713   if (url.mount_type() == fileapi::kFileSystemTypeIsolated) {
 714     // When Isolated filesystems is overlayed on top of another filesystem,
 715     // its per-filesystem permission overrides the underlying filesystem
 716     // permissions).
 717     return HasPermissionsForFileSystem(
 718         child_id, url.mount_filesystem_id(), permissions);
 719   }
 720
 721   FileSystemPermissionPolicyMap::iterator found =
 722       file_system_policy_map_.find(url.type());
 723   if (found == file_system_policy_map_.end())
 724     return false;
 725
 726   if ((found->second & fileapi::FILE_PERMISSION_READ_ONLY) &&
 727       permissions & ~READ_FILE_GRANT) {
 728     return false;
 729   }
 730
 731   if (found->second & fileapi::FILE_PERMISSION_USE_FILE_PERMISSION)
 732     return HasPermissionsForFile(child_id, url.path(), permissions);
 733
 734   if (found->second & fileapi::FILE_PERMISSION_SANDBOX)
 735     return true;
 736
 737   return false;
 738 }
 739
 740 bool ChildProcessSecurityPolicyImpl::CanReadFileSystemFile(
 741     int child_id,
 742     const fileapi::FileSystemURL& url) {
 743   return HasPermissionsForFileSystemFile(child_id, url, READ_FILE_GRANT);
 744 }
 745
 746 bool ChildProcessSecurityPolicyImpl::CanWriteFileSystemFile(
 747     int child_id,
 748     const fileapi::FileSystemURL& url) {
 749   return HasPermissionsForFileSystemFile(child_id, url, WRITE_FILE_GRANT);
 750 }
 751
 752 bool ChildProcessSecurityPolicyImpl::CanCreateFileSystemFile(
 753     int child_id,
 754     const fileapi::FileSystemURL& url) {
 755   return HasPermissionsForFileSystemFile(child_id, url, CREATE_NEW_FILE_GRANT);
 756 }
 757
 758 bool ChildProcessSecurityPolicyImpl::CanCreateReadWriteFileSystemFile(
 759     int child_id,
 760     const fileapi::FileSystemURL& url) {
 761   return HasPermissionsForFileSystemFile(child_id, url,
 762                                          CREATE_READ_WRITE_FILE_GRANT);
 763 }
 764
 765 bool ChildProcessSecurityPolicyImpl::CanCopyIntoFileSystemFile(
 766     int child_id,
 767     const fileapi::FileSystemURL& url) {
 768   return HasPermissionsForFileSystemFile(child_id, url, COPY_INTO_FILE_GRANT);
 769 }
 770
 771 bool ChildProcessSecurityPolicyImpl::CanDeleteFileSystemFile(
 772     int child_id,
 773     const fileapi::FileSystemURL& url) {
 774   return HasPermissionsForFileSystemFile(child_id, url, DELETE_FILE_GRANT);
 775 }
 776
 777 bool ChildProcessSecurityPolicyImpl::HasWebUIBindings(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->has_web_ui_bindings();
 785 }
 786
 787 bool ChildProcessSecurityPolicyImpl::CanReadRawCookies(int child_id) {
 788   base::AutoLock lock(lock_);
 789
 790   SecurityStateMap::iterator state = security_state_.find(child_id);
 791   if (state == security_state_.end())
 792     return false;
 793
 794   return state->second->can_read_raw_cookies();
 795 }
 796
 797 void ChildProcessSecurityPolicyImpl::AddChild(int child_id) {
 798   if (security_state_.count(child_id) != 0) {
 799     NOTREACHED() << "Add child process at most once.";
 800     return;
 801   }
 802
 803   security_state_[child_id] = new SecurityState();
 804 }
 805
 806 bool ChildProcessSecurityPolicyImpl::ChildProcessHasPermissionsForFile(
 807     int child_id, const base::FilePath& file, int permissions) {
 808   SecurityStateMap::iterator state = security_state_.find(child_id);
 809   if (state == security_state_.end())
 810     return false;
 811   return state->second->HasPermissionsForFile(file, permissions);
 812 }
 813
 814 bool ChildProcessSecurityPolicyImpl::CanAccessCookiesForOrigin(
 815     int child_id, const GURL& gurl) {
 816   base::AutoLock lock(lock_);
 817   SecurityStateMap::iterator state = security_state_.find(child_id);
 818   if (state == security_state_.end())
 819     return false;
 820   return state->second->CanAccessCookiesForOrigin(gurl);
 821 }
 822
 823 bool ChildProcessSecurityPolicyImpl::CanSendCookiesForOrigin(int child_id,
 824                                                              const GURL& gurl) {
 825   for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
 826     if (iter.GetData().id == child_id) {
 827       if (iter.GetData().process_type == PROCESS_TYPE_PLUGIN) {
 828         // NPAPI plugin processes are unsandboxed and so are trusted. Plugins
 829         // can make request to any origin.
 830         return true;
 831       }
 832       break;
 833     }
 834   }
 835
 836   base::AutoLock lock(lock_);
 837   SecurityStateMap::iterator state = security_state_.find(child_id);
 838   if (state == security_state_.end())
 839     return false;
 840   return state->second->CanSendCookiesForOrigin(gurl);
 841 }
 842
 843 void ChildProcessSecurityPolicyImpl::LockToOrigin(int child_id,
 844                                                   const GURL& gurl) {
 845   // "gurl" can be currently empty in some cases, such as file://blah.
 846   DCHECK(SiteInstanceImpl::GetSiteForURL(NULL, gurl) == gurl);
 847   base::AutoLock lock(lock_);
 848   SecurityStateMap::iterator state = security_state_.find(child_id);
 849   DCHECK(state != security_state_.end());
 850   state->second->LockToOrigin(gurl);
 851 }
 852
 853 void ChildProcessSecurityPolicyImpl::GrantPermissionsForFileSystem(
 854     int child_id,
 855     const std::string& filesystem_id,
 856     int permission) {
 857   base::AutoLock lock(lock_);
 858
 859   SecurityStateMap::iterator state = security_state_.find(child_id);
 860   if (state == security_state_.end())
 861     return;
 862   state->second->GrantPermissionsForFileSystem(filesystem_id, permission);
 863 }
 864
 865 bool ChildProcessSecurityPolicyImpl::HasPermissionsForFileSystem(
 866     int child_id,
 867     const std::string& filesystem_id,
 868     int permission) {
 869   base::AutoLock lock(lock_);
 870
 871   SecurityStateMap::iterator state = security_state_.find(child_id);
 872   if (state == security_state_.end())
 873     return false;
 874   return state->second->HasPermissionsForFileSystem(filesystem_id, permission);
 875 }
 876
 877 void ChildProcessSecurityPolicyImpl::RegisterFileSystemPermissionPolicy(
 878     fileapi::FileSystemType type,
 879     int policy) {
 880   base::AutoLock lock(lock_);
 881   file_system_policy_map_[type] = policy;
 882 }
 883
 884 bool ChildProcessSecurityPolicyImpl::CanSendMidiSysExMessage(int child_id) {
 885   base::AutoLock lock(lock_);
 886
 887   SecurityStateMap::iterator state = security_state_.find(child_id);
 888   if (state == security_state_.end())
 889     return false;
 890
 891   return state->second->can_send_midi_sysex();
 892 }
 893
 894 }  // namespace content