content/browser/download/base_file_win.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 "content/browser/download/base_file.h"
   6
   7 #include <windows.h>
   8 #include <cguid.h>
   9 #include <objbase.h>
  10 #include <shellapi.h>
  11
  12 #include "base/files/file.h"
  13 #include "base/files/file_util.h"
  14 #include "base/guid.h"
  15 #include "base/metrics/histogram.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/threading/thread_restrictions.h"
  18 #include "content/browser/download/download_interrupt_reasons_impl.h"
  19 #include "content/browser/download/download_stats.h"
  20 #include "content/browser/safe_util_win.h"
  21 #include "content/public/browser/browser_thread.h"
  22
  23 namespace content {
  24 namespace {
  25
  26 const int kAllSpecialShFileOperationCodes[] = {
  27   // Should be kept in sync with the case statement below.
  28   ERROR_ACCESS_DENIED,
  29   ERROR_SHARING_VIOLATION,
  30   ERROR_INVALID_PARAMETER,
  31   0x71,
  32   0x72,
  33   0x73,
  34   0x74,
  35   0x75,
  36   0x76,
  37   0x78,
  38   0x79,
  39   0x7A,
  40   0x7C,
  41   0x7D,
  42   0x7E,
  43   0x80,
  44   0x81,
  45   0x82,
  46   0x83,
  47   0x84,
  48   0x85,
  49   0x86,
  50   0x87,
  51   0x88,
  52   0xB7,
  53   0x402,
  54   0x10000,
  55   0x10074,
  56 };
  57
  58 // Maps the result of a call to |SHFileOperation()| onto a
  59 // |DownloadInterruptReason|.
  60 //
  61 // These return codes are *old* (as in, DOS era), and specific to
  62 // |SHFileOperation()|.
  63 // They do not appear in any windows header.
  64 //
  65 // See http://msdn.microsoft.com/en-us/library/bb762164(VS.85).aspx.
  66 DownloadInterruptReason MapShFileOperationCodes(int code) {
  67   DownloadInterruptReason result = DOWNLOAD_INTERRUPT_REASON_NONE;
  68
  69   // Check these pre-Win32 error codes first, then check for matches
  70   // in Winerror.h.
  71   // This switch statement should be kept in sync with the list of codes
  72   // above.
  73   switch (code) {
  74     // Not a pre-Win32 error code; here so that this particular case shows up in
  75     // our histograms. Unfortunately, it is used not just to signal actual
  76     // ACCESS_DENIED errors, but many other errors as well. So we treat it as a
  77     // transient error.
  78     case ERROR_ACCESS_DENIED:  // Access is denied.
  79       result = DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR;
  80       break;
  81
  82     // This isn't documented but returned from SHFileOperation. Sharing
  83     // violations indicate that another process had the file open while we were
  84     // trying to rename. Anti-virus is believed to be the cause of this error in
  85     // the wild. Treated as a transient error on the assumption that the file
  86     // will be made available for renaming at a later time.
  87     case ERROR_SHARING_VIOLATION:
  88       result = DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR;
  89       break;
  90
  91     // This is also not a documented return value of SHFileOperation, but has
  92     // been observed in the wild. We are treating it as a transient error based
  93     // on the cases we have seen so far.  See http://crbug.com/368455.
  94     case ERROR_INVALID_PARAMETER:
  95       result = DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR;
  96       break;
  97
  98     // The source and destination files are the same file.
  99     // DE_SAMEFILE == 0x71
 100     case 0x71:
 101       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 102       break;
 103
 104     // The operation was canceled by the user, or silently canceled if the
 105     // appropriate flags were supplied to SHFileOperation.
 106     // DE_OPCANCELLED == 0x75
 107     case 0x75:
 108       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 109       break;
 110
 111     // Security settings denied access to the source.
 112     // DE_ACCESSDENIEDSRC == 0x78
 113     case 0x78:
 114       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 115       break;
 116
 117     // The source or destination path exceeded or would exceed MAX_PATH.
 118     // DE_PATHTOODEEP == 0x79
 119     case 0x79:
 120       result = DOWNLOAD_INTERRUPT_REASON_FILE_NAME_TOO_LONG;
 121       break;
 122
 123     // The path in the source or destination or both was invalid.
 124     // DE_INVALIDFILES == 0x7C
 125     case 0x7C:
 126       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 127       break;
 128
 129     // The destination path is an existing file.
 130     // DE_FLDDESTISFILE == 0x7E
 131     case 0x7E:
 132       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 133       break;
 134
 135     // The destination path is an existing folder.
 136     // DE_FILEDESTISFLD == 0x80
 137     case 0x80:
 138       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 139       break;
 140
 141     // The name of the file exceeds MAX_PATH.
 142     // DE_FILENAMETOOLONG == 0x81
 143     case 0x81:
 144       result = DOWNLOAD_INTERRUPT_REASON_FILE_NAME_TOO_LONG;
 145       break;
 146
 147     // The destination is a read-only CD-ROM, possibly unformatted.
 148     // DE_DEST_IS_CDROM == 0x82
 149     case 0x82:
 150       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 151       break;
 152
 153     // The destination is a read-only DVD, possibly unformatted.
 154     // DE_DEST_IS_DVD == 0x83
 155     case 0x83:
 156       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 157       break;
 158
 159     // The destination is a writable CD-ROM, possibly unformatted.
 160     // DE_DEST_IS_CDRECORD == 0x84
 161     case 0x84:
 162       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 163       break;
 164
 165     // The file involved in the operation is too large for the destination
 166     // media or file system.
 167     // DE_FILE_TOO_LARGE == 0x85
 168     case 0x85:
 169       result = DOWNLOAD_INTERRUPT_REASON_FILE_TOO_LARGE;
 170       break;
 171
 172     // The source is a read-only CD-ROM, possibly unformatted.
 173     // DE_SRC_IS_CDROM == 0x86
 174     case 0x86:
 175       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 176       break;
 177
 178     // The source is a read-only DVD, possibly unformatted.
 179     // DE_SRC_IS_DVD == 0x87
 180     case 0x87:
 181       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 182       break;
 183
 184     // The source is a writable CD-ROM, possibly unformatted.
 185     // DE_SRC_IS_CDRECORD == 0x88
 186     case 0x88:
 187       result = DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
 188       break;
 189
 190     // MAX_PATH was exceeded during the operation.
 191     // DE_ERROR_MAX == 0xB7
 192     case 0xB7:
 193       result = DOWNLOAD_INTERRUPT_REASON_FILE_NAME_TOO_LONG;
 194       break;
 195
 196     // An unspecified error occurred on the destination.
 197     // XE_ERRORONDEST == 0x10000
 198     case 0x10000:
 199       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 200       break;
 201
 202     // Multiple file paths were specified in the source buffer, but only one
 203     // destination file path.
 204     // DE_MANYSRC1DEST == 0x72
 205     case 0x72:
 206       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 207       break;
 208
 209     // Rename operation was specified but the destination path is
 210     // a different directory. Use the move operation instead.
 211     // DE_DIFFDIR == 0x73
 212     case 0x73:
 213       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 214       break;
 215
 216     // The source is a root directory, which cannot be moved or renamed.
 217     // DE_ROOTDIR == 0x74
 218     case 0x74:
 219       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 220       break;
 221
 222     // The destination is a subtree of the source.
 223     // DE_DESTSUBTREE == 0x76
 224     case 0x76:
 225       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 226       break;
 227
 228     // The operation involved multiple destination paths,
 229     // which can fail in the case of a move operation.
 230     // DE_MANYDEST == 0x7A
 231     case 0x7A:
 232       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 233       break;
 234
 235     // The source and destination have the same parent folder.
 236     // DE_DESTSAMETREE == 0x7D
 237     case 0x7D:
 238       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 239       break;
 240
 241     // An unknown error occurred.  This is typically due to an invalid path in
 242     // the source or destination.  This error does not occur on Windows Vista
 243     // and later.
 244     // DE_UNKNOWN_ERROR == 0x402
 245     case 0x402:
 246       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 247       break;
 248
 249     // Destination is a root directory and cannot be renamed.
 250     // DE_ROOTDIR | ERRORONDEST == 0x10074
 251     case 0x10074:
 252       result = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 253       break;
 254   }
 255
 256   // Narrow down on the reason we're getting some catch-all interrupt reasons.
 257   if (result == DOWNLOAD_INTERRUPT_REASON_FILE_FAILED) {
 258     UMA_HISTOGRAM_CUSTOM_ENUMERATION(
 259         "Download.MapWinShErrorFileFailed", code,
 260         base::CustomHistogram::ArrayToCustomRanges(
 261             kAllSpecialShFileOperationCodes,
 262             arraysize(kAllSpecialShFileOperationCodes)));
 263   }
 264
 265   if (result == DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED) {
 266     UMA_HISTOGRAM_CUSTOM_ENUMERATION(
 267         "Download.MapWinShErrorAccessDenied", code,
 268         base::CustomHistogram::ArrayToCustomRanges(
 269             kAllSpecialShFileOperationCodes,
 270             arraysize(kAllSpecialShFileOperationCodes)));
 271   }
 272
 273   if (result == DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR) {
 274     UMA_HISTOGRAM_CUSTOM_ENUMERATION(
 275         "Download.MapWinShErrorTransientError", code,
 276         base::CustomHistogram::ArrayToCustomRanges(
 277             kAllSpecialShFileOperationCodes,
 278             arraysize(kAllSpecialShFileOperationCodes)));
 279   }
 280
 281   if (result != DOWNLOAD_INTERRUPT_REASON_NONE)
 282     return result;
 283
 284   // If not one of the above codes, it should be a standard Windows error code.
 285   return ConvertFileErrorToInterruptReason(
 286       base::File::OSErrorToFileError(code));
 287 }
 288
 289 // Maps a return code from ScanAndSaveDownloadedFile() to a
 290 // DownloadInterruptReason. The return code in |result| is usually from the
 291 // final IAttachmentExecute::Save() call.
 292 DownloadInterruptReason MapScanAndSaveErrorCodeToInterruptReason(
 293     HRESULT result) {
 294   if (SUCCEEDED(result))
 295     return DOWNLOAD_INTERRUPT_REASON_NONE;
 296
 297   switch (result) {
 298     case INET_E_SECURITY_PROBLEM:       // 0x800c000e
 299       // This is returned if the download was blocked due to security
 300       // restrictions. E.g. if the source URL was in the Restricted Sites zone
 301       // and downloads are blocked on that zone, then the download would be
 302       // deleted and this error code is returned.
 303       return DOWNLOAD_INTERRUPT_REASON_FILE_BLOCKED;
 304
 305     case E_FAIL:                        // 0x80004005
 306       // Returned if an anti-virus product reports an infection in the
 307       // downloaded file during IAE::Save().
 308       return DOWNLOAD_INTERRUPT_REASON_FILE_VIRUS_INFECTED;
 309
 310     default:
 311       // Any other error that occurs during IAttachmentExecute::Save() likely
 312       // indicates a problem with the security check, but not necessarily the
 313       // download. See http://crbug.com/153212.
 314       return DOWNLOAD_INTERRUPT_REASON_FILE_SECURITY_CHECK_FAILED;
 315   }
 316 }
 317
 318 } // namespace
 319
 320 // Renames a file using the SHFileOperation API to ensure that the target file
 321 // gets the correct default security descriptor in the new path.
 322 // Returns a network error, or net::OK for success.
 323 DownloadInterruptReason BaseFile::MoveFileAndAdjustPermissions(
 324     const base::FilePath& new_path) {
 325   base::ThreadRestrictions::AssertIOAllowed();
 326
 327   // The parameters to SHFileOperation must be terminated with 2 NULL chars.
 328   base::FilePath::StringType source = full_path_.value();
 329   base::FilePath::StringType target = new_path.value();
 330
 331   source.append(1, L'\0');
 332   target.append(1, L'\0');
 333
 334   SHFILEOPSTRUCT move_info = {0};
 335   move_info.wFunc = FO_MOVE;
 336   move_info.pFrom = source.c_str();
 337   move_info.pTo = target.c_str();
 338   move_info.fFlags = FOF_SILENT | FOF_NOCONFIRMATION | FOF_NOERRORUI |
 339       FOF_NOCONFIRMMKDIR | FOF_NOCOPYSECURITYATTRIBS;
 340
 341   base::TimeTicks now = base::TimeTicks::Now();
 342   int result = SHFileOperation(&move_info);
 343   DownloadInterruptReason interrupt_reason = DOWNLOAD_INTERRUPT_REASON_NONE;
 344
 345   if (result == 0 && move_info.fAnyOperationsAborted)
 346     interrupt_reason = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
 347   else if (result != 0)
 348     interrupt_reason = MapShFileOperationCodes(result);
 349
 350   if (interrupt_reason != DOWNLOAD_INTERRUPT_REASON_NONE)
 351     return LogInterruptReason("SHFileOperation", result, interrupt_reason);
 352   return interrupt_reason;
 353 }
 354
 355 DownloadInterruptReason BaseFile::AnnotateWithSourceInformation() {
 356   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 357   DCHECK(!detached_);
 358
 359   bound_net_log_.BeginEvent(net::NetLog::TYPE_DOWNLOAD_FILE_ANNOTATED);
 360   DownloadInterruptReason result = DOWNLOAD_INTERRUPT_REASON_NONE;
 361   std::string braces_guid = "{" + client_guid_ + "}";
 362   GUID guid = GUID_NULL;
 363   if (base::IsValidGUID(client_guid_)) {
 364     HRESULT hr = CLSIDFromString(
 365         base::UTF8ToUTF16(braces_guid).c_str(), &guid);
 366     if (FAILED(hr))
 367       guid = GUID_NULL;
 368   }
 369
 370   HRESULT hr = AVScanFile(full_path_, source_url_.spec(), guid);
 371
 372   // If the download file is missing after the call, then treat this as an
 373   // interrupted download.
 374   //
 375   // If the ScanAndSaveDownloadedFile() call failed, but the downloaded file is
 376   // still around, then don't interrupt the download. Attachment Execution
 377   // Services deletes the submitted file if the downloaded file is blocked by
 378   // policy or if it was found to be infected.
 379   //
 380   // If the file is still there, then the error could be due to AES not being
 381   // available or some other error during the AES invocation. In either case,
 382   // we don't surface the error to the user.
 383   if (!base::PathExists(full_path_)) {
 384     DCHECK(FAILED(hr));
 385     result = MapScanAndSaveErrorCodeToInterruptReason(hr);
 386     if (result == DOWNLOAD_INTERRUPT_REASON_NONE) {
 387       RecordDownloadCount(FILE_MISSING_AFTER_SUCCESSFUL_SCAN_COUNT);
 388       result = DOWNLOAD_INTERRUPT_REASON_FILE_SECURITY_CHECK_FAILED;
 389     }
 390     LogInterruptReason("ScanAndSaveDownloadedFile", hr, result);
 391   }
 392   bound_net_log_.EndEvent(net::NetLog::TYPE_DOWNLOAD_FILE_ANNOTATED);
 393   return result;
 394 }
 395
 396 }  // namespace content