components/nacl/browser/nacl_process_host.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 COMPONENTS_NACL_BROWSER_NACL_PROCESS_HOST_H_
   6 #define COMPONENTS_NACL_BROWSER_NACL_PROCESS_HOST_H_
   7
   8 #include "build/build_config.h"
   9
  10 #include <vector>
  11
  12 #include "base/files/file.h"
  13 #include "base/files/file_path.h"
  14 #include "base/files/file_util_proxy.h"
  15 #include "base/memory/ref_counted.h"
  16 #include "base/memory/shared_memory.h"
  17 #include "base/memory/weak_ptr.h"
  18 #include "base/message_loop/message_loop.h"
  19 #include "base/process/process.h"
  20 #include "components/nacl/common/nacl_types.h"
  21 #include "content/public/browser/browser_child_process_host_delegate.h"
  22 #include "content/public/browser/browser_child_process_host_iterator.h"
  23 #include "ipc/ipc_channel_handle.h"
  24 #include "net/socket/socket_descriptor.h"
  25 #include "ppapi/shared_impl/ppapi_permissions.h"
  26 #include "url/gurl.h"
  27
  28 namespace content {
  29 class BrowserChildProcessHost;
  30 class BrowserPpapiHost;
  31 }
  32
  33 namespace IPC {
  34 class ChannelProxy;
  35 }
  36
  37 namespace nacl {
  38
  39 // NaClFileToken is a single-use nonce that the NaCl loader process can use
  40 // to query the browser process for trusted information about a file.  This
  41 // helps establish that the file is known by the browser to be immutable
  42 // and suitable for file-identity-based validation caching.  lo == 0 && hi
  43 // == 0 indicates the token is invalid and no additional information is
  44 // available.
  45 struct NaClFileToken {
  46   uint64_t lo;
  47   uint64_t hi;
  48 };
  49
  50 class NaClHostMessageFilter;
  51 void* AllocateAddressSpaceASLR(base::ProcessHandle process, size_t size);
  52
  53 // Represents the browser side of the browser <--> NaCl communication
  54 // channel. There will be one NaClProcessHost per NaCl process
  55 // The browser is responsible for starting the NaCl process
  56 // when requested by the renderer.
  57 // After that, most of the communication is directly between NaCl plugin
  58 // running in the renderer and NaCl processes.
  59 class NaClProcessHost : public content::BrowserChildProcessHostDelegate {
  60  public:
  61   // manifest_url: the URL of the manifest of the Native Client plugin being
  62   // executed.
  63   // nexe_file: A file that corresponds to the nexe module to be loaded.
  64   // nexe_token: A cache validation token for nexe_file.
  65   // prefetched_resource_files_info: An array of resource files prefetched.
  66   // permissions: PPAPI permissions, to control access to private APIs.
  67   // render_view_id: RenderView routing id, to control access to private APIs.
  68   // permission_bits: controls which interfaces the NaCl plugin can use.
  69   // uses_nonsfi_mode: whether the program should be loaded under non-SFI mode.
  70   // off_the_record: was the process launched from an incognito renderer?
  71   // process_type: the type of NaCl process.
  72   // profile_directory: is the path of current profile directory.
  73   NaClProcessHost(
  74       const GURL& manifest_url,
  75       base::File nexe_file,
  76       const NaClFileToken& nexe_token,
  77       const std::vector<NaClResourcePrefetchResult>& prefetched_resource_files,
  78       ppapi::PpapiPermissions permissions,
  79       int render_view_id,
  80       uint32 permission_bits,
  81       bool uses_nonsfi_mode,
  82       bool off_the_record,
  83       NaClAppProcessType process_type,
  84       const base::FilePath& profile_directory);
  85   ~NaClProcessHost() override;
  86
  87   void OnProcessCrashed(int exit_status) override;
  88
  89   // Do any minimal work that must be done at browser startup.
  90   static void EarlyStartup();
  91
  92   // Specifies throttling time in milliseconds for PpapiHostMsg_Keepalive IPCs.
  93   static void SetPpapiKeepAliveThrottleForTesting(unsigned milliseconds);
  94
  95   // Initialize the new NaCl process. Result is returned by sending ipc
  96   // message reply_msg.
  97   void Launch(NaClHostMessageFilter* nacl_host_message_filter,
  98               IPC::Message* reply_msg,
  99               const base::FilePath& manifest_path);
 100
 101   void OnChannelConnected(int32 peer_pid) override;
 102
 103 #if defined(OS_WIN)
 104   void OnProcessLaunchedByBroker(base::ProcessHandle handle);
 105   void OnDebugExceptionHandlerLaunchedByBroker(bool success);
 106 #endif
 107
 108   bool Send(IPC::Message* msg);
 109
 110   content::BrowserChildProcessHost* process() { return process_.get(); }
 111   content::BrowserPpapiHost* browser_ppapi_host() { return ppapi_host_.get(); }
 112
 113  private:
 114   class ScopedChannelHandle;
 115
 116   void LaunchNaClGdb();
 117
 118   // Mark the process as using a particular GDB debug stub port and notify
 119   // listeners (if the port is not kGdbDebugStubPortUnknown).
 120   void SetDebugStubPort(int port);
 121
 122 #if defined(OS_POSIX)
 123   // Create bound TCP socket in the browser process so that the NaCl GDB debug
 124   // stub can use it to accept incoming connections even when the Chrome sandbox
 125   // is enabled.
 126   net::SocketDescriptor GetDebugStubSocketHandle();
 127 #endif
 128
 129 #if defined(OS_WIN)
 130   // Called when the debug stub port has been selected.
 131   void OnDebugStubPortSelected(uint16_t debug_stub_port);
 132 #endif
 133
 134   bool LaunchSelLdr();
 135
 136   // BrowserChildProcessHostDelegate implementation:
 137   bool OnMessageReceived(const IPC::Message& msg) override;
 138   void OnProcessLaunched() override;
 139
 140   void OnResourcesReady();
 141
 142   // Enable the PPAPI proxy only for NaCl processes corresponding to a renderer.
 143   bool enable_ppapi_proxy() { return render_view_id_ != 0; }
 144
 145   // Sends the reply message to the renderer who is waiting for the plugin
 146   // to load. Returns true on success.
 147   void ReplyToRenderer(
 148       ScopedChannelHandle ppapi_channel_handle,
 149       ScopedChannelHandle trusted_channel_handle,
 150       ScopedChannelHandle manifest_service_channel_handle);
 151
 152   // Sends the reply with error message to the renderer.
 153   void SendErrorToRenderer(const std::string& error_message);
 154
 155   // Sends the reply message to the renderer. Either result or
 156   // error message must be empty.
 157   void SendMessageToRenderer(const NaClLaunchResult& result,
 158                              const std::string& error_message);
 159
 160   // Sends the message to the NaCl process to load the plugin. Returns true
 161   // on success.
 162   bool StartNaClExecution();
 163
 164   void StartNaClFileResolved(
 165       NaClStartParams params,
 166       const base::FilePath& file_path,
 167       base::File nexe_file);
 168
 169 #if defined(OS_LINUX)
 170   // Creates a pair of IPC::ChannelHandle. Returns true on success.
 171   static bool CreateChannelHandlePair(ScopedChannelHandle* channel_handle1,
 172                                       ScopedChannelHandle* channel_handle2);
 173 #endif
 174
 175   // Starts browser PPAPI proxy. Returns true on success.
 176   bool StartPPAPIProxy(ScopedChannelHandle channel_handle);
 177
 178   // Does post-process-launching tasks for starting the NaCl process once
 179   // we have a connection.
 180   //
 181   // Returns false on failure.
 182   bool StartWithLaunchedProcess();
 183
 184   // Message handlers for validation caching.
 185   void OnQueryKnownToValidate(const std::string& signature, bool* result);
 186   void OnSetKnownToValidate(const std::string& signature);
 187   void OnResolveFileToken(uint64 file_token_lo, uint64 file_token_hi);
 188   void FileResolved(uint64_t file_token_lo,
 189                     uint64_t file_token_hi,
 190                     const base::FilePath& file_path,
 191                     base::File file);
 192 #if defined(OS_WIN)
 193   // Message handler for Windows hardware exception handling.
 194   void OnAttachDebugExceptionHandler(const std::string& info,
 195                                      IPC::Message* reply_msg);
 196   bool AttachDebugExceptionHandler(const std::string& info,
 197                                    IPC::Message* reply_msg);
 198 #endif
 199
 200   // Called when the PPAPI IPC channels to the browser/renderer have been
 201   // created.
 202   void OnPpapiChannelsCreated(
 203       const IPC::ChannelHandle& ppapi_browser_channel_handle,
 204       const IPC::ChannelHandle& ppapi_renderer_channel_handle,
 205       const IPC::ChannelHandle& trusted_renderer_channel_handle,
 206       const IPC::ChannelHandle& manifest_service_channel_handle);
 207
 208   GURL manifest_url_;
 209   base::File nexe_file_;
 210   NaClFileToken nexe_token_;
 211   std::vector<NaClResourcePrefetchResult> prefetched_resource_files_;
 212
 213   ppapi::PpapiPermissions permissions_;
 214
 215 #if defined(OS_WIN)
 216   // This field becomes true when the broker successfully launched
 217   // the NaCl loader.
 218   bool process_launched_by_broker_;
 219 #endif
 220   // The NaClHostMessageFilter that requested this NaCl process.  We use
 221   // this for sending the reply once the process has started.
 222   scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter_;
 223
 224   // The reply message to send. We must always send this message when the
 225   // sub-process either succeeds or fails to unblock the renderer waiting for
 226   // the reply. NULL when there is no reply to send.
 227   IPC::Message* reply_msg_;
 228 #if defined(OS_WIN)
 229   bool debug_exception_handler_requested_;
 230   scoped_ptr<IPC::Message> attach_debug_exception_handler_reply_msg_;
 231 #endif
 232
 233   // The file path to the manifest is passed to nacl-gdb when it is used to
 234   // debug the NaCl loader.
 235   base::FilePath manifest_path_;
 236
 237   scoped_ptr<content::BrowserChildProcessHost> process_;
 238
 239   bool uses_nonsfi_mode_;
 240
 241   bool enable_debug_stub_;
 242   bool enable_crash_throttling_;
 243   bool off_the_record_;
 244   NaClAppProcessType process_type_;
 245
 246   const base::FilePath profile_directory_;
 247
 248   // Channel proxy to terminate the NaCl-Browser PPAPI channel.
 249   scoped_ptr<IPC::ChannelProxy> ipc_proxy_channel_;
 250   // Browser host for plugin process.
 251   scoped_ptr<content::BrowserPpapiHost> ppapi_host_;
 252
 253   int render_view_id_;
 254
 255   // Throttling time in milliseconds for PpapiHostMsg_Keepalive IPCs.
 256   static unsigned keepalive_throttle_interval_milliseconds_;
 257
 258   // Shared memory provided to the plugin and renderer for
 259   // reporting crash information.
 260   base::SharedMemory crash_info_shmem_;
 261
 262   base::File socket_for_renderer_;
 263   base::File socket_for_sel_ldr_;
 264
 265   base::WeakPtrFactory<NaClProcessHost> weak_factory_;
 266
 267   DISALLOW_COPY_AND_ASSIGN(NaClProcessHost);
 268 };
 269
 270 }  // namespace nacl
 271
 272 #endif  // COMPONENTS_NACL_BROWSER_NACL_PROCESS_HOST_H_