chrome/common/safe_browsing/zip_analyzer.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 "chrome/common/safe_browsing/zip_analyzer.h"
   6
   7 #include "base/logging.h"
   8 #include "chrome/common/safe_browsing/download_protection_util.h"
   9 #include "third_party/zlib/google/zip_reader.h"
  10
  11 namespace safe_browsing {
  12 namespace zip_analyzer {
  13
  14 void AnalyzeZipFile(base::PlatformFile zip_file, Results* results) {
  15   zip::ZipReader reader;
  16   if (!reader.OpenFromPlatformFile(zip_file)) {
  17     VLOG(1) << "Failed to open zip file";
  18     return;
  19   }
  20
  21   bool advanced = true;
  22   for (; reader.HasMore(); advanced = reader.AdvanceToNextEntry()) {
  23     if (!advanced) {
  24       VLOG(1) << "Could not advance to next entry, aborting zip scan.";
  25       return;
  26     }
  27     if (!reader.OpenCurrentEntryInZip()) {
  28       VLOG(1) << "Failed to open current entry in zip file";
  29       continue;
  30     }
  31     const base::FilePath& file = reader.current_entry_info()->file_path();
  32     if (download_protection_util::IsBinaryFile(file)) {
  33       // Don't consider an archived archive to be executable, but record
  34       // a histogram.
  35       if (download_protection_util::IsArchiveFile(file)) {
  36         results->has_archive = true;
  37       } else {
  38         VLOG(2) << "Downloaded a zipped executable: " << file.value();
  39         results->has_executable = true;
  40         break;
  41       }
  42     } else {
  43       VLOG(3) << "Ignoring non-binary file: " << file.value();
  44     }
  45   }
  46   results->success = true;
  47 }
  48
  49 }  // namespace zip_analyzer
  50 }  // namespace safe_browsing