wimlib.net Git - wimlib/blob - src/win32_apply.c

   1 /*
   2  * win32_apply.c - Windows-specific code for applying files from a WIM image.
   3  */
   4
   5 /*
   6  * Copyright (C) 2013 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef __WIN32__
  25
  26 #ifdef HAVE_CONFIG_H
  27 #  include "config.h"
  28 #endif
  29
  30 #include "wimlib/win32_common.h"
  31
  32 #include "wimlib/apply.h"
  33 #include "wimlib/error.h"
  34 #include "wimlib/lookup_table.h"
  35
  36 #ifdef WITH_NTDLL
  37 #  include <winternl.h>
  38 #  include <ntstatus.h>
  39 NTSTATUS WINAPI
  40 NtSetSecurityObject(HANDLE Handle,
  41                     SECURITY_INFORMATION SecurityInformation,
  42                     PSECURITY_DESCRIPTOR SecurityDescriptor);
  43 #endif
  44
  45 static int
  46 win32_start_extract(const wchar_t *path, struct apply_ctx *ctx)
  47 {
  48         int ret;
  49         unsigned vol_flags;
  50         bool supports_SetFileShortName;
  51
  52         ret = win32_get_vol_flags(path, &vol_flags, &supports_SetFileShortName);
  53         if (ret)
  54                 return ret;
  55
  56         ctx->supported_features.archive_files = 1;
  57         ctx->supported_features.hidden_files = 1;
  58         ctx->supported_features.system_files = 1;
  59
  60         if (vol_flags & FILE_FILE_COMPRESSION)
  61                 ctx->supported_features.compressed_files = 1;
  62
  63         if (vol_flags & FILE_SUPPORTS_ENCRYPTION) {
  64                 ctx->supported_features.encrypted_files = 1;
  65                 ctx->supported_features.encrypted_directories = 1;
  66         }
  67
  68         ctx->supported_features.not_context_indexed_files = 1;
  69
  70         if (vol_flags & FILE_SUPPORTS_SPARSE_FILES)
  71                 ctx->supported_features.sparse_files = 1;
  72
  73         if (vol_flags & FILE_NAMED_STREAMS)
  74                 ctx->supported_features.named_data_streams = 1;
  75
  76         if (vol_flags & FILE_SUPPORTS_HARD_LINKS)
  77                 ctx->supported_features.hard_links = 1;
  78
  79         if (vol_flags & FILE_SUPPORTS_REPARSE_POINTS) {
  80                 ctx->supported_features.reparse_points = 1;
  81                 if (win32func_CreateSymbolicLinkW)
  82                         ctx->supported_features.symlink_reparse_points = 1;
  83         }
  84
  85         if (vol_flags & FILE_PERSISTENT_ACLS)
  86                 ctx->supported_features.security_descriptors = 1;
  87
  88         if (supports_SetFileShortName)
  89                 ctx->supported_features.short_names = 1;
  90         return 0;
  91 }
  92
  93 static int
  94 win32_create_file(const wchar_t *path, struct apply_ctx *ctx, u64 *cookie_ret)
  95 {
  96         HANDLE h;
  97
  98         h = CreateFile(path, 0, 0, NULL, CREATE_ALWAYS,
  99                        FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, NULL);
 100         if (h == INVALID_HANDLE_VALUE)
 101                 goto error;
 102         CloseHandle(h);
 103         return 0;
 104
 105 error:
 106         set_errno_from_GetLastError();
 107         return WIMLIB_ERR_OPEN;
 108 }
 109
 110 static int
 111 win32_create_directory(const wchar_t *path, struct apply_ctx *ctx,
 112                        u64 *cookie_ret)
 113 {
 114         if (!CreateDirectory(path, NULL))
 115                 if (GetLastError() != ERROR_ALREADY_EXISTS)
 116                         goto error;
 117         return 0;
 118
 119 error:
 120         set_errno_from_GetLastError();
 121         return WIMLIB_ERR_MKDIR;
 122 }
 123
 124 static int
 125 win32_create_hardlink(const wchar_t *oldpath, const wchar_t *newpath,
 126                       struct apply_ctx *ctx)
 127 {
 128         if (!CreateHardLink(newpath, oldpath, NULL)) {
 129                 if (GetLastError() != ERROR_ALREADY_EXISTS)
 130                         goto error;
 131                 if (!DeleteFile(newpath))
 132                         goto error;
 133                 if (!CreateHardLink(newpath, oldpath, NULL))
 134                         goto error;
 135         }
 136         return 0;
 137
 138 error:
 139         set_errno_from_GetLastError();
 140         return WIMLIB_ERR_LINK;
 141 }
 142
 143 static int
 144 win32_create_symlink(const wchar_t *oldpath, const wchar_t *newpath,
 145                      struct apply_ctx *ctx)
 146 {
 147         if (!(*win32func_CreateSymbolicLinkW)(newpath, oldpath, 0)) {
 148                 if (GetLastError() != ERROR_ALREADY_EXISTS)
 149                         goto error;
 150                 if (!DeleteFile(newpath))
 151                         goto error;
 152                 if (!(*win32func_CreateSymbolicLinkW)(newpath, oldpath, 0))
 153                         goto error;
 154         }
 155         return 0;
 156
 157 error:
 158         set_errno_from_GetLastError();
 159         return WIMLIB_ERR_LINK;
 160 }
 161
 162 static int
 163 win32_extract_wim_chunk(const void *buf, size_t len, void *arg)
 164 {
 165         HANDLE h = (HANDLE)arg;
 166         DWORD nbytes_written;
 167
 168         if (unlikely(!WriteFile(h, buf, len, &nbytes_written, NULL)))
 169                 goto error;
 170         if (unlikely(nbytes_written != len))
 171                 goto error;
 172         return 0;
 173
 174 error:
 175         set_errno_from_GetLastError();
 176         return WIMLIB_ERR_WRITE;
 177 }
 178
 179 static int
 180 win32_extract_stream(const wchar_t *path, const wchar_t *stream_name,
 181                      size_t stream_name_nchars,
 182                      struct wim_lookup_table_entry *lte, struct apply_ctx *ctx)
 183 {
 184         DWORD creationDisposition = OPEN_EXISTING;
 185         wchar_t *stream_path = (wchar_t*)path;
 186         HANDLE h;
 187         int ret;
 188
 189         if (stream_name_nchars) {
 190                 creationDisposition = CREATE_ALWAYS;
 191                 stream_path = alloca(sizeof(wchar_t) *
 192                                      (wcslen(path) + 1 +
 193                                       wcslen(stream_name) + 1));
 194                 swprintf(stream_path, L"%ls:%ls", path, stream_name);
 195         }
 196
 197         h = CreateFile(stream_path, FILE_WRITE_DATA, 0, NULL,
 198                        creationDisposition, FILE_FLAG_BACKUP_SEMANTICS |
 199                                             FILE_FLAG_OPEN_REPARSE_POINT,
 200                        NULL);
 201         if (h == INVALID_HANDLE_VALUE)
 202                 goto error;
 203
 204         ret = 0;
 205         if (!lte)
 206                 goto out_close_handle;
 207         ret = extract_wim_resource(lte, wim_resource_size(lte),
 208                                    win32_extract_wim_chunk, h);
 209 out_close_handle:
 210         if (!CloseHandle(h))
 211                 goto error;
 212         if (ret && !errno)
 213                 errno = -1;
 214         return ret;
 215
 216 error:
 217         set_errno_from_GetLastError();
 218         return WIMLIB_ERR_WRITE;
 219 }
 220
 221 static int
 222 win32_extract_unnamed_stream(file_spec_t file,
 223                              struct wim_lookup_table_entry *lte,
 224                              struct apply_ctx *ctx)
 225 {
 226         return win32_extract_stream(file.path, NULL, 0, lte, ctx);
 227 }
 228
 229 static int
 230 win32_extract_named_stream(file_spec_t file, const wchar_t *stream_name,
 231                            size_t stream_name_nchars,
 232                            struct wim_lookup_table_entry *lte, struct apply_ctx *ctx)
 233 {
 234         return win32_extract_stream(file.path, stream_name,
 235                                     stream_name_nchars, lte, ctx);
 236 }
 237
 238 struct win32_encrypted_extract_ctx {
 239         const struct wim_lookup_table_entry *lte;
 240         u64 offset;
 241 };
 242
 243 static DWORD WINAPI
 244 win32_encrypted_import_cb(unsigned char *data, void *_import_ctx,
 245                           unsigned long *len_p)
 246 {
 247         struct win32_encrypted_extract_ctx *import_ctx = _import_ctx;
 248         unsigned long len = *len_p;
 249         const struct wim_lookup_table_entry *lte = import_ctx->lte;
 250
 251         len = min(len, wim_resource_size(lte) - import_ctx->offset);
 252
 253         if (read_partial_wim_resource_into_buf(lte, len, import_ctx->offset, data))
 254                 return ERROR_READ_FAULT;
 255
 256         import_ctx->offset += len;
 257         *len_p = len;
 258         return ERROR_SUCCESS;
 259 }
 260
 261 static int
 262 win32_extract_encrypted_stream(const wchar_t *path,
 263                                struct wim_lookup_table_entry *lte,
 264                                struct apply_ctx *ctx)
 265 {
 266         void *file_ctx;
 267         DWORD err;
 268         int ret;
 269         struct win32_encrypted_extract_ctx extract_ctx;
 270
 271         err = OpenEncryptedFileRaw(path, CREATE_FOR_IMPORT, &file_ctx);
 272         if (err != ERROR_SUCCESS) {
 273                 set_errno_from_win32_error(err);
 274                 ret = WIMLIB_ERR_OPEN;
 275                 goto out;
 276         }
 277
 278         extract_ctx.lte = lte;
 279         extract_ctx.offset = 0;
 280         err = WriteEncryptedFileRaw(win32_encrypted_import_cb, &extract_ctx,
 281                                     file_ctx);
 282         if (err != ERROR_SUCCESS) {
 283                 set_errno_from_win32_error(err);
 284                 ret = WIMLIB_ERR_WRITE;
 285                 goto out_close;
 286         }
 287
 288         ret = 0;
 289 out_close:
 290         CloseEncryptedFileRaw(file_ctx);
 291 out:
 292         return ret;
 293 }
 294
 295 static BOOL
 296 win32_set_special_file_attributes(const wchar_t *path, u32 attributes)
 297 {
 298         HANDLE h;
 299         DWORD err;
 300         USHORT compression_format = COMPRESSION_FORMAT_DEFAULT;
 301         DWORD bytes_returned;
 302
 303         h = win32_open_existing_file(path, GENERIC_READ | GENERIC_WRITE);
 304         if (h == INVALID_HANDLE_VALUE)
 305                 goto error;
 306
 307         if (attributes & FILE_ATTRIBUTE_SPARSE_FILE)
 308                 if (!DeviceIoControl(h, FSCTL_SET_SPARSE,
 309                                      NULL, 0,
 310                                      NULL, 0,
 311                                      &bytes_returned, NULL))
 312                         goto error_close_handle;
 313
 314         if (attributes & FILE_ATTRIBUTE_COMPRESSED)
 315                 if (!DeviceIoControl(h, FSCTL_SET_COMPRESSION,
 316                                      &compression_format, sizeof(USHORT),
 317                                      NULL, 0,
 318                                      &bytes_returned, NULL))
 319                         goto error_close_handle;
 320
 321         if (!CloseHandle(h))
 322                 goto error;
 323
 324         if (attributes & FILE_ATTRIBUTE_ENCRYPTED)
 325                 if (!EncryptFile(path))
 326                         goto error;
 327
 328         return TRUE;
 329
 330 error_close_handle:
 331         err = GetLastError();
 332         CloseHandle(h);
 333         SetLastError(err);
 334 error:
 335         return FALSE;
 336 }
 337
 338 static int
 339 win32_set_file_attributes(const wchar_t *path, u32 attributes,
 340                           struct apply_ctx *ctx, unsigned pass)
 341 {
 342         u32 special_attributes =
 343                 FILE_ATTRIBUTE_REPARSE_POINT |
 344                 FILE_ATTRIBUTE_DIRECTORY |
 345                 FILE_ATTRIBUTE_SPARSE_FILE |
 346                 FILE_ATTRIBUTE_COMPRESSED |
 347                 FILE_ATTRIBUTE_ENCRYPTED;
 348         u32 actual_attributes;
 349
 350         /* Delay setting FILE_ATTRIBUTE_READONLY on the initial pass (when files
 351          * are created, but data not extracted); otherwise the system will
 352          * refuse access to the file even if the process has SeRestorePrivilege.
 353          */
 354         if (pass == 0)
 355                 attributes &= ~FILE_ATTRIBUTE_READONLY;
 356
 357         if (!SetFileAttributes(path, attributes & ~special_attributes))
 358                 goto error;
 359
 360         if (pass != 0)
 361                 return 0;
 362
 363         if (attributes & (FILE_ATTRIBUTE_SPARSE_FILE |
 364                           FILE_ATTRIBUTE_ENCRYPTED |
 365                           FILE_ATTRIBUTE_COMPRESSED))
 366                 if (!win32_set_special_file_attributes(path, attributes))
 367                         goto error;
 368
 369         /* If file is not supposed to be encrypted or compressed, remove
 370          * defaulted encrypted or compressed attributes (from creating file in
 371          * encrypted or compressed directory).  */
 372         actual_attributes = GetFileAttributes(path);
 373         if (actual_attributes == INVALID_FILE_ATTRIBUTES)
 374                 goto error;
 375
 376         if ((actual_attributes & FILE_ATTRIBUTE_ENCRYPTED) &&
 377             !(attributes & FILE_ATTRIBUTE_ENCRYPTED))
 378                 if (!DecryptFile(path, 0))
 379                         goto error;
 380         if ((actual_attributes & FILE_ATTRIBUTE_COMPRESSED) &&
 381             !(attributes & FILE_ATTRIBUTE_COMPRESSED))
 382         {
 383                 HANDLE h;
 384                 DWORD bytes_returned;
 385                 USHORT compression_format = COMPRESSION_FORMAT_NONE;
 386
 387                 h = win32_open_existing_file(path, GENERIC_READ | GENERIC_WRITE);
 388                 if (h == INVALID_HANDLE_VALUE)
 389                         goto error;
 390
 391                 if (!DeviceIoControl(h, FSCTL_SET_COMPRESSION,
 392                                      &compression_format, sizeof(USHORT),
 393                                      NULL, 0,
 394                                      &bytes_returned, NULL))
 395                 {
 396                         DWORD err = GetLastError();
 397                         CloseHandle(h);
 398                         SetLastError(err);
 399                         goto error;
 400                 }
 401
 402                 if (!CloseHandle(h))
 403                         goto error;
 404         }
 405
 406         return 0;
 407
 408 error:
 409         set_errno_from_GetLastError();
 410         return WIMLIB_ERR_SET_ATTRIBUTES;
 411 }
 412
 413 static int
 414 win32_set_reparse_data(const wchar_t *path, const u8 *rpbuf, u16 rpbuflen,
 415                        struct apply_ctx *ctx)
 416 {
 417         HANDLE h;
 418         DWORD err;
 419         DWORD bytes_returned;
 420
 421         h = win32_open_existing_file(path, GENERIC_WRITE);
 422         if (h == INVALID_HANDLE_VALUE)
 423                 goto error;
 424
 425         if (!DeviceIoControl(h, FSCTL_SET_REPARSE_POINT,
 426                              (void*)rpbuf, rpbuflen,
 427                              NULL, 0, &bytes_returned, NULL))
 428                 goto error_close_handle;
 429
 430         if (!CloseHandle(h))
 431                 goto error;
 432
 433         return 0;
 434
 435 error_close_handle:
 436         err = GetLastError();
 437         CloseHandle(h);
 438         SetLastError(err);
 439 error:
 440         set_errno_from_GetLastError();
 441         return WIMLIB_ERR_WRITE; /* XXX: need better error code */
 442 }
 443
 444 static int
 445 win32_set_short_name(const wchar_t *path, const wchar_t *short_name,
 446                      size_t short_name_nchars, struct apply_ctx *ctx)
 447 {
 448         HANDLE h;
 449         DWORD err;
 450
 451         h = win32_open_existing_file(path, GENERIC_WRITE | DELETE);
 452         if (h == INVALID_HANDLE_VALUE)
 453                 goto error;
 454
 455         if (short_name_nchars) {
 456                 if (!SetFileShortName(h, short_name))
 457                         goto error_close_handle;
 458         } else if (running_on_windows_7_or_later()) {
 459                 if (!SetFileShortName(h, L""))
 460                         goto error_close_handle;
 461         }
 462
 463         if (!CloseHandle(h))
 464                 goto error;
 465
 466         return 0;
 467
 468 error_close_handle:
 469         err = GetLastError();
 470         CloseHandle(h);
 471         SetLastError(err);
 472 error:
 473         set_errno_from_GetLastError();
 474         return WIMLIB_ERR_WRITE; /* XXX: need better error code */
 475 }
 476
 477 static DWORD
 478 do_win32_set_security_descriptor(HANDLE h, const wchar_t *path,
 479                                  SECURITY_INFORMATION info,
 480                                  PSECURITY_DESCRIPTOR desc)
 481 {
 482 #ifdef WITH_NTDLL
 483         return RtlNtStatusToDosError(NtSetSecurityObject(h, info, desc));
 484 #else
 485         if (SetFileSecurity(path, info, desc))
 486                 return ERROR_SUCCESS;
 487         else
 488                 return GetLastError();
 489 #endif
 490 }
 491
 492 static int
 493 win32_set_security_descriptor(const wchar_t *path, const u8 *desc,
 494                               size_t desc_size, struct apply_ctx *ctx)
 495 {
 496         SECURITY_INFORMATION info;
 497         HANDLE h;
 498         DWORD err;
 499         int ret;
 500
 501         info = OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
 502                DACL_SECURITY_INFORMATION  | SACL_SECURITY_INFORMATION;
 503         h = INVALID_HANDLE_VALUE;
 504
 505 #ifdef WITH_NTDLL
 506         h = win32_open_existing_file(path, MAXIMUM_ALLOWED);
 507         if (h == INVALID_HANDLE_VALUE) {
 508                 ERROR_WITH_ERRNO("Can't open %ls (%u)", path, GetLastError());
 509                 goto error;
 510         }
 511 #endif
 512
 513         for (;;) {
 514                 err = do_win32_set_security_descriptor(h, path, info,
 515                                                        (PSECURITY_DESCRIPTOR)desc);
 516                 if (err == ERROR_SUCCESS)
 517                         break;
 518                 if ((err == ERROR_PRIVILEGE_NOT_HELD ||
 519                      err == ERROR_ACCESS_DENIED) &&
 520                     !(ctx->extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_ACLS))
 521                 {
 522                         if (info & SACL_SECURITY_INFORMATION) {
 523                                 info &= ~SACL_SECURITY_INFORMATION;
 524                                 ctx->partial_security_descriptors++;
 525                                 continue;
 526                         }
 527                         if (info & DACL_SECURITY_INFORMATION) {
 528                                 info &= ~DACL_SECURITY_INFORMATION;
 529                                 continue;
 530                         }
 531                         if (info & OWNER_SECURITY_INFORMATION) {
 532                                 info &= ~OWNER_SECURITY_INFORMATION;
 533                                 continue;
 534                         }
 535                         ctx->partial_security_descriptors--;
 536                         ctx->no_security_descriptors++;
 537                         break;
 538                 }
 539                 goto error;
 540         }
 541         ret = 0;
 542 out_close:
 543 #ifdef WITH_NTDLL
 544         CloseHandle(h);
 545 #endif
 546         return ret;
 547
 548 error:
 549         set_errno_from_GetLastError();
 550         ret = WIMLIB_ERR_SET_SECURITY;
 551         goto out_close;
 552 }
 553
 554 static int
 555 win32_set_timestamps(const wchar_t *path, u64 creation_time,
 556                      u64 last_write_time, u64 last_access_time,
 557                      struct apply_ctx *ctx)
 558 {
 559         HANDLE h;
 560         DWORD err;
 561         FILETIME creationTime = {.dwLowDateTime = creation_time & 0xffffffff,
 562                                  .dwHighDateTime = creation_time >> 32};
 563         FILETIME lastAccessTime = {.dwLowDateTime = last_access_time & 0xffffffff,
 564                                   .dwHighDateTime = last_access_time >> 32};
 565         FILETIME lastWriteTime = {.dwLowDateTime = last_write_time & 0xffffffff,
 566                                   .dwHighDateTime = last_write_time >> 32};
 567
 568         h = win32_open_existing_file(path, FILE_WRITE_ATTRIBUTES);
 569         if (h == INVALID_HANDLE_VALUE)
 570                 goto error;
 571
 572         if (!SetFileTime(h, &creationTime, &lastAccessTime, &lastWriteTime))
 573                 goto error_close_handle;
 574
 575         if (!CloseHandle(h))
 576                 goto error;
 577
 578         return 0;
 579
 580 error_close_handle:
 581         err = GetLastError();
 582         CloseHandle(h);
 583         SetLastError(err);
 584 error:
 585         set_errno_from_GetLastError();
 586         return WIMLIB_ERR_SET_TIMESTAMPS;
 587 }
 588
 589 const struct apply_operations win32_apply_ops = {
 590         .name = L"Win32",
 591
 592         .target_is_root           = win32_path_is_root_of_drive,
 593         .start_extract            = win32_start_extract,
 594         .create_file              = win32_create_file,
 595         .create_directory         = win32_create_directory,
 596         .create_hardlink          = win32_create_hardlink,
 597         .create_symlink           = win32_create_symlink,
 598         .extract_unnamed_stream   = win32_extract_unnamed_stream,
 599         .extract_named_stream     = win32_extract_named_stream,
 600         .extract_encrypted_stream = win32_extract_encrypted_stream,
 601         .set_file_attributes      = win32_set_file_attributes,
 602         .set_reparse_data         = win32_set_reparse_data,
 603         .set_short_name           = win32_set_short_name,
 604         .set_security_descriptor  = win32_set_security_descriptor,
 605         .set_timestamps           = win32_set_timestamps,
 606
 607         .path_prefix = L"\\\\?\\",
 608         .path_prefix_nchars = 4,
 609         .path_separator = L'\\',
 610         .path_max = 32768,
 611
 612         .requires_realtarget_in_paths = 1,
 613         .realpath_works_on_nonexisting_files = 1,
 614         .root_directory_is_special = 1,
 615         .requires_final_set_attributes_pass = 1,
 616         .extract_encrypted_stream_creates_file = 1,
 617 };
 618
 619 #endif /* __WIN32__ */