Support for recording registered LSPs

chrome/browser/safe_browsing/environment_data_collection_win.cc

 // Copyright 2014 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/safe_browsing/environment_data_collection_win.h"
 
+#include <windows.h>
+#include <set>
+
+#include "base/strings/string16.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/install_verification/win/module_info.h"
+#include "chrome/browser/install_verification/win/module_verification_common.h"
+#include "chrome/browser/net/service_providers_win.h"
+#include "chrome/browser/safe_browsing/path_sanitizer.h"
 #include "chrome/common/safe_browsing/csd.pb.h"
 
 namespace safe_browsing {
 
+namespace {
+
+// Helper function for expanding all environment variables in |path|.
+base::string16 ExpandEnvironmentVariables(const base::string16& path) {
+  static const DWORD kMaxBuffer = 32 * 1024;  // Max according to MSDN.
+  base::string16 path_expanded;
+  DWORD path_len = MAX_PATH;
+  do {
+    DWORD result = ExpandEnvironmentStrings(
+        path.c_str(), WriteInto(&path_expanded, path_len), path_len);
+    if (!result) {
+      // Failed to expand variables. Return the original string.
+      DPLOG(ERROR) << path;
+      break;
+    }
+    if (result <= path_len)
+      return path_expanded.substr(0, result - 1);
+    path_len = result;
+  } while (path_len < kMaxBuffer);
+
+  return path;
+}
+
+}  // namespace
+
+bool CollectDlls(ClientIncidentReport_EnvironmentData_Process* process) {
+  // Retrieve the module list.
+  std::set<ModuleInfo> loaded_modules;
+  if (!GetLoadedModules(&loaded_modules))
+    return false;
+
+  // Sanitize path of each module and add it to the incident report.
+  PathSanitizer path_sanitizer;
+  for (std::set<ModuleInfo>::const_iterator it = loaded_modules.begin();
+       it != loaded_modules.end();
+       ++it) {
+    base::string16 dll_path(it->name);
+    path_sanitizer.StripHomeDirectoryFromString(&dll_path);
+
+    ClientIncidentReport_EnvironmentData_Process_Dll* dll = process->add_dlls();
+    dll->set_path(base::WideToUTF8(dll_path));
+    dll->set_base_address(it->base_address);
+    dll->set_length(it->size);
+  }
+
+  return true;
+}
+
+void RecordLspFeatures(ClientIncidentReport_EnvironmentData_Process* process) {
+  WinsockLayeredServiceProviderList lsp_list;
+  GetWinsockLayeredServiceProviders(&lsp_list);
+
+  // For each LSP, we extract and sanitize the path.
+  PathSanitizer path_sanitizer;
+  std::set<base::string16> lsp_paths;
+  for (size_t i = 0; i < lsp_list.size(); ++i) {
+    base::string16 lsp_path = ExpandEnvironmentVariables(lsp_list[i].path);
+    path_sanitizer.StripHomeDirectoryFromString(&lsp_path);
+    lsp_paths.insert(lsp_path);
+  }
+
+  // Look for a match between LSPs and loaded dlls.
+  for (int i = 0; i < process->dlls_size(); ++i) {
+    if (lsp_paths.count(base::UTF8ToWide(process->dlls(i).path()))) {
+      process->mutable_dlls(i)->add_features(
+          ClientIncidentReport_EnvironmentData_Process_Dll_Feature_LSP);

[grt (UTC plus 2), 2014/06/10 20:57:53]

i think it looks a tad nicer to use the in-class constant in this case:
ClientIncidentReport_EnvironmentData_Process_Dll::LSP

[pmonette_google.com, 2014/06/10 21:39:04]

Done.

Cool! Wasn't aware that I could use the enum constant this way with protobuf.

+    }
+  }
+}
+
 void CollectPlatformProcessData(
     ClientIncidentReport_EnvironmentData_Process* process) {
-  // TODO(pmonette): collect dlls and lsps.
+  CollectDlls(process);
+  RecordLspFeatures(process);
 }
 
 }  // namespace safe_browsing