content/browser/child_process_security_policy_impl.h

   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 #ifndef CONTENT_BROWSER_CHILD_PROCESS_SECURITY_POLICY_IMPL_H_
   6 #define CONTENT_BROWSER_CHILD_PROCESS_SECURITY_POLICY_IMPL_H_
   7
   8
   9 #include <map>
  10 #include <set>
  11 #include <string>
  12
  13 #include "base/compiler_specific.h"
  14 #include "base/gtest_prod_util.h"
  15 #include "base/memory/singleton.h"
  16 #include "base/synchronization/lock.h"
  17 #include "content/public/browser/child_process_security_policy.h"
  18 #include "content/public/common/resource_type.h"
  19 #include "storage/common/fileapi/file_system_types.h"
  20
  21 class GURL;
  22
  23 namespace base {
  24 class FilePath;
  25 }
  26
  27 namespace storage {
  28 class FileSystemURL;
  29 }
  30
  31 namespace content {
  32
  33 class CONTENT_EXPORT ChildProcessSecurityPolicyImpl
  34     : NON_EXPORTED_BASE(public ChildProcessSecurityPolicy) {
  35  public:
  36   // Object can only be created through GetInstance() so the constructor is
  37   // private.
  38   ~ChildProcessSecurityPolicyImpl() override;
  39
  40   static ChildProcessSecurityPolicyImpl* GetInstance();
  41
  42   // ChildProcessSecurityPolicy implementation.
  43   void RegisterWebSafeScheme(const std::string& scheme) override;
  44   bool IsWebSafeScheme(const std::string& scheme) override;
  45   void GrantReadFile(int child_id, const base::FilePath& file) override;
  46   void GrantCreateReadWriteFile(int child_id,
  47                                 const base::FilePath& file) override;
  48   void GrantCopyInto(int child_id, const base::FilePath& dir) override;
  49   void GrantDeleteFrom(int child_id, const base::FilePath& dir) override;
  50   void GrantReadFileSystem(int child_id,
  51                            const std::string& filesystem_id) override;
  52   void GrantWriteFileSystem(int child_id,
  53                             const std::string& filesystem_id) override;
  54   void GrantCreateFileForFileSystem(int child_id,
  55                                     const std::string& filesystem_id) override;
  56   void GrantCreateReadWriteFileSystem(
  57       int child_id,
  58       const std::string& filesystem_id) override;
  59   void GrantCopyIntoFileSystem(int child_id,
  60                                const std::string& filesystem_id) override;
  61   void GrantDeleteFromFileSystem(int child_id,
  62                                  const std::string& filesystem_id) override;
  63   void GrantScheme(int child_id, const std::string& scheme) override;
  64   bool CanReadFile(int child_id, const base::FilePath& file) override;
  65   bool CanCreateReadWriteFile(int child_id,
  66                               const base::FilePath& file) override;
  67   bool CanReadFileSystem(int child_id,
  68                          const std::string& filesystem_id) override;
  69   bool CanReadWriteFileSystem(int child_id,
  70                               const std::string& filesystem_id) override;
  71   bool CanCopyIntoFileSystem(int child_id,
  72                              const std::string& filesystem_id) override;
  73   bool CanDeleteFromFileSystem(int child_id,
  74                                const std::string& filesystem_id) override;
  75   bool HasWebUIBindings(int child_id) override;
  76
  77   // Pseudo schemes are treated differently than other schemes because they
  78   // cannot be requested like normal URLs.  There is no mechanism for revoking
  79   // pseudo schemes.
  80   void RegisterPseudoScheme(const std::string& scheme);
  81
  82   // Returns true iff |scheme| has been registered as pseudo scheme.
  83   bool IsPseudoScheme(const std::string& scheme);
  84
  85   // Upon creation, child processes should register themselves by calling this
  86   // this method exactly once.
  87   void Add(int child_id);
  88
  89   // Upon creation, worker thread child processes should register themselves by
  90   // calling this this method exactly once. Workers that are not shared will
  91   // inherit permissions from their parent renderer process identified with
  92   // |main_render_process_id|.
  93   void AddWorker(int worker_child_id, int main_render_process_id);
  94
  95   // Upon destruction, child processess should unregister themselves by caling
  96   // this method exactly once.
  97   void Remove(int child_id);
  98
  99   // Whenever the browser processes commands the child process to request a URL,
 100   // it should call this method to grant the child process the capability to
 101   // request the URL, along with permission to request all URLs of the same
 102   // scheme.
 103   void GrantRequestURL(int child_id, const GURL& url);
 104
 105   // Whenever the browser process drops a file icon on a tab, it should call
 106   // this method to grant the child process the capability to request this one
 107   // file:// URL, but not all urls of the file:// scheme.
 108   void GrantRequestSpecificFileURL(int child_id, const GURL& url);
 109
 110   // Revokes all permissions granted to the given file.
 111   void RevokeAllPermissionsForFile(int child_id, const base::FilePath& file);
 112
 113   // Grant the child process the ability to use Web UI Bindings.
 114   void GrantWebUIBindings(int child_id);
 115
 116   // Grant the child process the ability to read raw cookies.
 117   void GrantReadRawCookies(int child_id);
 118
 119   // Revoke read raw cookies permission.
 120   void RevokeReadRawCookies(int child_id);
 121
 122   // Grants permission to send system exclusive message to any MIDI devices.
 123   void GrantSendMidiSysExMessage(int child_id);
 124
 125   // Before servicing a child process's request for a URL, the browser should
 126   // call this method to determine whether the process has the capability to
 127   // request the URL.
 128   bool CanRequestURL(int child_id, const GURL& url);
 129
 130   // Returns true if the process is permitted to load pages from
 131   // the given origin in main frames or subframes.
 132   // Only might return false if --site-per-process flag is used.
 133   bool CanLoadPage(int child_id,
 134                    const GURL& url,
 135                    ResourceType resource_type);
 136
 137   // Explicit permissions checks for FileSystemURL specified files.
 138   bool CanReadFileSystemFile(int child_id, const storage::FileSystemURL& url);
 139   bool CanWriteFileSystemFile(int child_id, const storage::FileSystemURL& url);
 140   bool CanCreateFileSystemFile(int child_id, const storage::FileSystemURL& url);
 141   bool CanCreateReadWriteFileSystemFile(int child_id,
 142                                         const storage::FileSystemURL& url);
 143   bool CanCopyIntoFileSystemFile(int child_id,
 144                                  const storage::FileSystemURL& url);
 145   bool CanDeleteFileSystemFile(int child_id, const storage::FileSystemURL& url);
 146
 147   // Returns true if the specified child_id has been granted ReadRawCookies.
 148   bool CanReadRawCookies(int child_id);
 149
 150   // Returns true if the process is permitted to read and modify the cookies for
 151   // the given origin.  Does not affect cookies attached to or set by network
 152   // requests.
 153   // Only might return false if the very experimental
 154   // --enable-strict-site-isolation or --site-per-process flags are used.
 155   bool CanAccessCookiesForOrigin(int child_id, const GURL& gurl);
 156
 157   // Returns true if the process is permitted to attach cookies to (or have
 158   // cookies set by) network requests.
 159   // Only might return false if the very experimental
 160   // --enable-strict-site-isolation or --site-per-process flags are used.
 161   bool CanSendCookiesForOrigin(int child_id, const GURL& gurl);
 162
 163   // Sets the process as only permitted to use and see the cookies for the
 164   // given origin.
 165   // Only used if the very experimental --enable-strict-site-isolation or
 166   // --site-per-process flags are used.
 167   void LockToOrigin(int child_id, const GURL& gurl);
 168
 169   // Register FileSystem type and permission policy which should be used
 170   // for the type.  The |policy| must be a bitwise-or'd value of
 171   // storage::FilePermissionPolicy.
 172   void RegisterFileSystemPermissionPolicy(storage::FileSystemType type,
 173                                           int policy);
 174
 175   // Returns true if sending system exclusive messages is allowed.
 176   bool CanSendMidiSysExMessage(int child_id);
 177
 178  private:
 179   friend class ChildProcessSecurityPolicyInProcessBrowserTest;
 180   friend class ChildProcessSecurityPolicyTest;
 181   FRIEND_TEST_ALL_PREFIXES(ChildProcessSecurityPolicyInProcessBrowserTest,
 182                            NoLeak);
 183   FRIEND_TEST_ALL_PREFIXES(ChildProcessSecurityPolicyTest, FilePermissions);
 184
 185   class SecurityState;
 186
 187   typedef std::set<std::string> SchemeSet;
 188   typedef std::map<int, SecurityState*> SecurityStateMap;
 189   typedef std::map<int, int> WorkerToMainProcessMap;
 190   typedef std::map<storage::FileSystemType, int> FileSystemPermissionPolicyMap;
 191
 192   // Obtain an instance of ChildProcessSecurityPolicyImpl via GetInstance().
 193   ChildProcessSecurityPolicyImpl();
 194   friend struct DefaultSingletonTraits<ChildProcessSecurityPolicyImpl>;
 195
 196   // Adds child process during registration.
 197   void AddChild(int child_id);
 198
 199   // Determines if certain permissions were granted for a file to given child
 200   // process. |permissions| is an internally defined bit-set.
 201   bool ChildProcessHasPermissionsForFile(int child_id,
 202                                          const base::FilePath& file,
 203                                          int permissions);
 204
 205   // Grant a particular permission set for a file. |permissions| is an
 206   // internally defined bit-set.
 207   void GrantPermissionsForFile(int child_id,
 208                                const base::FilePath& file,
 209                                int permissions);
 210
 211   // Grants access permission to the given isolated file system
 212   // identified by |filesystem_id|.  See comments for
 213   // ChildProcessSecurityPolicy::GrantReadFileSystem() for more details.
 214   void GrantPermissionsForFileSystem(
 215       int child_id,
 216       const std::string& filesystem_id,
 217       int permission);
 218
 219   // Determines if certain permissions were granted for a file. |permissions|
 220   // is an internally defined bit-set. If |child_id| is a worker process,
 221   // this returns true if either the worker process or its parent renderer
 222   // has permissions for the file.
 223   bool HasPermissionsForFile(int child_id,
 224                              const base::FilePath& file,
 225                              int permissions);
 226
 227   // Determines if certain permissions were granted for a file in FileSystem
 228   // API. |permissions| is an internally defined bit-set.
 229   bool HasPermissionsForFileSystemFile(int child_id,
 230                                        const storage::FileSystemURL& url,
 231                                        int permissions);
 232
 233   // Determines if certain permissions were granted for a file system.
 234   // |permissions| is an internally defined bit-set.
 235   bool HasPermissionsForFileSystem(
 236       int child_id,
 237       const std::string& filesystem_id,
 238       int permission);
 239
 240   // You must acquire this lock before reading or writing any members of this
 241   // class.  You must not block while holding this lock.
 242   base::Lock lock_;
 243
 244   // These schemes are white-listed for all child processes.  This set is
 245   // protected by |lock_|.
 246   SchemeSet web_safe_schemes_;
 247
 248   // These schemes do not actually represent retrievable URLs.  For example,
 249   // the the URLs in the "about" scheme are aliases to other URLs.  This set is
 250   // protected by |lock_|.
 251   SchemeSet pseudo_schemes_;
 252
 253   // This map holds a SecurityState for each child process.  The key for the
 254   // map is the ID of the ChildProcessHost.  The SecurityState objects are
 255   // owned by this object and are protected by |lock_|.  References to them must
 256   // not escape this class.
 257   SecurityStateMap security_state_;
 258
 259   // This maps keeps the record of which js worker thread child process
 260   // corresponds to which main js thread child process.
 261   WorkerToMainProcessMap worker_map_;
 262
 263   FileSystemPermissionPolicyMap file_system_policy_map_;
 264
 265   DISALLOW_COPY_AND_ASSIGN(ChildProcessSecurityPolicyImpl);
 266 };
 267
 268 }  // namespace content
 269
 270 #endif  // CONTENT_BROWSER_CHILD_PROCESS_SECURITY_POLICY_IMPL_H_