Require manifests for native messaging hosts.

chrome/browser/extensions/api/messaging/native_process_launcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/messaging/native_process_launcher.h"
 
 #include "base/basictypes.h"
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
+#include "base/string_split.h"
 #include "base/threading/sequenced_worker_pool.h"
+#include "chrome/browser/extensions/api/messaging/native_messaging_host_manifest.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
 
 namespace extensions {
 
 namespace {
 
 const char kNativeHostsDirectoryName[] = "native_hosts";
 
+scoped_ptr<NativeMessagingHostManifest> LoadHostManifestFromCommandLine(
+    const std::string& native_host_name) {
+  const std::string& value =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kNativeMessagingHosts);
+  if (value.empty())
+    return scoped_ptr<NativeMessagingHostManifest>(NULL);
+
+  std::vector<std::string> hosts;
+  base::SplitString(value, ',', &hosts);

[Matt Perry, 2013/02/16 02:00:51]

note this means that you can't have commas or equals in the native host name or
path. seems fine, but you should document that at least.

[Sergey Ulanov, 2013/02/20 00:05:36]

Current design doc says that these names should be in the alphabet [a-z0-9._],
i.e. commas in the name are not allowed. I've added checks for it in this CL.
This code doesn't work for the case when comma is in the path, but I don't think
we need to worry about it given that this switch is just for testing.

+  for (size_t i = 0; i < hosts.size(); ++i) {
+    std::vector<std::string> key_and_value;
+    base::SplitString(hosts[i], '=', &key_and_value);
+    if (key_and_value.size() != 2)
+      continue;
+    if (key_and_value[0] == native_host_name) {
+      std::string error_message;
+      scoped_ptr<NativeMessagingHostManifest> result =
+          NativeMessagingHostManifest::Load(
+              FilePath::FromUTF8Unsafe(key_and_value[1]),
+              &error_message);
+      if (!result) {
+        LOG(ERROR) << "Failed to load Native Messaging Host manifest "
+                   << key_and_value[1] << " " << error_message;
+      }
+      return result.Pass();
+    }
+  }
+
+  return scoped_ptr<NativeMessagingHostManifest>(NULL);
+}
+
+
 // Default implementation on NativeProcessLauncher interface.
 class NativeProcessLauncherImpl : public NativeProcessLauncher {
  public:
   NativeProcessLauncherImpl();
   virtual ~NativeProcessLauncherImpl();
 
-  virtual void Launch(const std::string& native_host_name,
+  virtual void Launch(const std::string& origin,
+                      const std::string& native_host_name,
                       LaunchedCallback callback) const OVERRIDE;
 
  private:
   class Core : public base::RefCountedThreadSafe<Core> {
    public:
     Core();
-    void Launch(const std::string& native_host_name,
+    void Launch(const std::string& origin,
+                const std::string& native_host_name,
                 LaunchedCallback callback);
     void Detach();
    private:
     friend class base::RefCountedThreadSafe<Core>;
     virtual ~Core();
 
-    void DoLaunchOnThreadPool(const std::string& native_host_name,
+    void DoLaunchOnThreadPool(const std::string& origin,
+                              const std::string& native_host_name,
                               LaunchedCallback callback);
     void CallCallbackOnIOThread(LaunchedCallback callback,
                                 base::ProcessHandle native_process_handle,
                                 base::PlatformFile read_file,
                                 base::PlatformFile write_file);
 
     bool detached_;
 
     DISALLOW_COPY_AND_ASSIGN(Core);
   };
@@ skipping 10 matching lines @@
 NativeProcessLauncherImpl::Core::~Core() {
   DCHECK(detached_);
 }
 
 void NativeProcessLauncherImpl::Core::Detach() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
   detached_ = true;
 }
 
 void NativeProcessLauncherImpl::Core::Launch(
+    const std::string& origin,
     const std::string& native_host_name,
     LaunchedCallback callback) {
   content::BrowserThread::PostBlockingPoolTask(
       FROM_HERE, base::Bind(&Core::DoLaunchOnThreadPool, this,
-                            native_host_name, callback));
+                            origin, native_host_name, callback));
 }
 
 void NativeProcessLauncherImpl::Core::DoLaunchOnThreadPool(
+    const std::string& origin,
     const std::string& native_host_name,
     LaunchedCallback callback) {
   DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
 
-  base::FilePath native_host_program;
-  base::FilePath native_host_registry;
-  CHECK(PathService::Get(chrome::DIR_USER_DATA, &native_host_registry));
-  native_host_registry =
-      native_host_registry.AppendASCII(kNativeHostsDirectoryName);
-  native_host_program = native_host_registry.AppendASCII(native_host_name);
+  std::string error_message;
+  scoped_ptr<NativeMessagingHostManifest> manifest;
 
-  // Make sure that the client is not trying to invoke something outside of the
-  // proper directory. Eg. '../../dangerous_something.exe'.
-  if (!file_util::ContainsPath(native_host_registry, native_host_program)) {
-    LOG(ERROR) << "Could not find native host: " << native_host_name;
+  // First try loading the host from the location specified in the command line.
+  manifest = LoadHostManifestFromCommandLine(native_host_name);
+
+  // If the manifest location wasn't specified in the command line then load it
+  // from the default location.
+  if (!manifest)
+    manifest = FindAndLoadManifest(native_host_name, &error_message);
+
+  if (manifest && manifest->name() != native_host_name) {
+    error_message = "Invalid name specified in the manifest.";

[Matt Perry, 2013/02/16 02:00:51]

"Name specified in the manifest does not match"?

[Sergey Ulanov, 2013/02/20 00:05:36]

Done.

+    manifest.reset();
+  }
+
+  if (!manifest) {
+    // TODO(sergeyu): Report the error to the application.
+    LOG(ERROR) << "Failed to load manifest for native messaging host "
+               << native_host_name << ": " << error_message;
     content::BrowserThread::PostTask(
         content::BrowserThread::IO, FROM_HERE,
         base::Bind(&NativeProcessLauncherImpl::Core::CallCallbackOnIOThread,
                    this, callback, base::kNullProcessHandle,
                    base::kInvalidPlatformFileValue,
                    base::kInvalidPlatformFileValue));
     return;
   }
 
+  if (!manifest->IsAllowedOrigin(origin)) {
+    // Not an allowed origin
+    content::BrowserThread::PostTask(
+        content::BrowserThread::IO, FROM_HERE,
+        base::Bind(&NativeProcessLauncherImpl::Core::CallCallbackOnIOThread,
+                   this, callback, base::kNullProcessHandle,
+                   base::kInvalidPlatformFileValue,
+                   base::kInvalidPlatformFileValue));
+    return;
+  }
+
+  FilePath native_host_program = manifest->path();
+
   base::ProcessHandle native_process_handle;
   base::PlatformFile read_file;
   base::PlatformFile write_file;
   if (!NativeProcessLauncher::LaunchNativeProcess(
           native_host_program, &native_process_handle,
           &read_file, &write_file)) {
     native_process_handle = base::kNullProcessHandle;
   }
 
   content::BrowserThread::PostTask(
@@ skipping 24 matching lines @@
 }
 
 NativeProcessLauncherImpl::NativeProcessLauncherImpl()
   : core_(new Core()) {
 }
 
 NativeProcessLauncherImpl::~NativeProcessLauncherImpl() {
   core_->Detach();
 }
 
-void NativeProcessLauncherImpl::Launch(const std::string& native_host_name,
+void NativeProcessLauncherImpl::Launch(const std::string& origin,
+                                       const std::string& native_host_name,
                                        LaunchedCallback callback) const {
-  core_->Launch(native_host_name, callback);
+  core_->Launch(origin, native_host_name, callback);
 }
 
 }  // namespace
 
 // static
 scoped_ptr<NativeProcessLauncher> NativeProcessLauncher::CreateDefault() {
   return scoped_ptr<NativeProcessLauncher>(new NativeProcessLauncherImpl());
 }
 
 }  // namespace extensions