![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to fat.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [truecrypt] / truecrypt / common|
Return to fat.c CVS log | Up to [truecrypt] / truecrypt / common |
1.1.1.10 root 1: /*
1.1.1.12 root 2: Legal Notice: Some portions of the source code contained in this file were
3: derived from the source code of Encryption for the Masses 2.02a, which is
4: Copyright (c) 1998-2000 Paul Le Roux and which is governed by the 'License
5: Agreement for Encryption for the Masses'. Modifications and additions to
1.1.1.18 root 6: the original source code (contained in this file) and all other portions
1.1.1.19 root 7: of this file are Copyright (c) 2003-2010 TrueCrypt Developers Association
8: and are governed by the TrueCrypt License 3.0 the full text of which is
1.1.1.18 root 9: contained in the file License.txt included in TrueCrypt binary and source
10: code distribution packages. */
1.1.1.10 root 11:
12: #include <stdlib.h>
13: #include <string.h>
14: #include <time.h>
1.1.1.6 root 15:
16: #include "Tcdefs.h"
17:
18: #include "Crypto.h"
1.1.1.10 root 19: #include "Common/Endian.h"
1.1.1.6 root 20: #include "Format.h"
21: #include "Fat.h"
22: #include "Progress.h"
1.1.1.8 root 23: #include "Random.h"
1.1.1.19 root 24: #include "Volumes.h"
1.1 root 25:
26: void
27: GetFatParams (fatparams * ft)
28: {
1.1.1.19 root 29: uint64 volumeSize = (uint64) ft->num_sectors * ft->sector_size;
1.1.1.10 root 30: unsigned int fatsecs;
1.1.1.19 root 31:
1.1.1.5 root 32: if(ft->cluster_size == 0) // 'Default' cluster size
1.1 root 33: {
1.1.1.19 root 34: uint32 clusterSize;
35:
36: // Determine optimal cluster size to minimize FAT size (mounting delay), maximize number of files, keep 4 KB alignment, etc.
37: if (volumeSize >= 2 * BYTES_PER_TB)
38: clusterSize = 256 * BYTES_PER_KB;
39: else if (volumeSize >= 512 * BYTES_PER_GB)
40: clusterSize = 128 * BYTES_PER_KB;
41: else if (volumeSize >= 128 * BYTES_PER_GB)
42: clusterSize = 64 * BYTES_PER_KB;
43: else if (volumeSize >= 64 * BYTES_PER_GB)
44: clusterSize = 32 * BYTES_PER_KB;
45: else if (volumeSize >= 32 * BYTES_PER_GB)
46: clusterSize = 16 * BYTES_PER_KB;
47: else if (volumeSize >= 16 * BYTES_PER_GB)
48: clusterSize = 8 * BYTES_PER_KB;
49: else if (volumeSize >= 512 * BYTES_PER_MB)
50: clusterSize = 4 * BYTES_PER_KB;
51: else if (volumeSize >= 256 * BYTES_PER_MB)
52: clusterSize = 2 * BYTES_PER_KB;
53: else if (volumeSize >= 1 * BYTES_PER_MB)
54: clusterSize = 1 * BYTES_PER_KB;
1.1 root 55: else
1.1.1.19 root 56: clusterSize = 512;
57:
58: ft->cluster_size = clusterSize / ft->sector_size;
59:
60: if (ft->cluster_size == 0)
1.1 root 61: ft->cluster_size = 1;
1.1.1.19 root 62:
63: if (ft->cluster_size * ft->sector_size > TC_MAX_FAT_CLUSTER_SIZE)
64: ft->cluster_size = TC_MAX_FAT_CLUSTER_SIZE / ft->sector_size;
65:
66: if (ft->cluster_size > 128)
67: ft->cluster_size = 128;
1.1 root 68: }
69:
1.1.1.19 root 70: if (volumeSize <= TC_MAX_FAT_CLUSTER_SIZE * 4)
71: ft->cluster_size = 1;
72:
1.1 root 73: // Geometry always set to SECTORS/1/1
74: ft->secs_track = 1;
75: ft->heads = 1;
76:
77: ft->dir_entries = 512;
78: ft->fats = 2;
79: ft->media = 0xf8;
1.1.1.11 root 80: ft->hidden = 0;
1.1 root 81:
82: ft->size_root_dir = ft->dir_entries * 32;
83:
1.1.1.6 root 84: // FAT12
1.1 root 85: ft->size_fat = 12;
1.1.1.6 root 86: ft->reserved = 2;
1.1.1.19 root 87: fatsecs = ft->num_sectors - (ft->size_root_dir + ft->sector_size - 1) / ft->sector_size - ft->reserved;
1.1.1.20! root 88: ft->cluster_count = (int) (((__int64) fatsecs * ft->sector_size) / (ft->cluster_size * ft->sector_size));
1.1.1.19 root 89: ft->fat_length = (((ft->cluster_count * 3 + 1) >> 1) + ft->sector_size - 1) / ft->sector_size;
1.1 root 90:
1.1.1.6 root 91: if (ft->cluster_count >= 4085) // FAT16
1.1 root 92: {
93: ft->size_fat = 16;
1.1.1.11 root 94: ft->reserved = 2;
1.1.1.19 root 95: fatsecs = ft->num_sectors - (ft->size_root_dir + ft->sector_size - 1) / ft->sector_size - ft->reserved;
1.1.1.20! root 96: ft->cluster_count = (int) (((__int64) fatsecs * ft->sector_size) / (ft->cluster_size * ft->sector_size));
1.1.1.19 root 97: ft->fat_length = (ft->cluster_count * 2 + ft->sector_size - 1) / ft->sector_size;
1.1 root 98: }
1.1.1.6 root 99:
100: if(ft->cluster_count >= 65525) // FAT32
1.1 root 101: {
102: ft->size_fat = 32;
1.1.1.19 root 103: ft->reserved = 32 - 1;
104:
105: do
106: {
107: ft->reserved++;
108:
109: fatsecs = ft->num_sectors - ft->reserved;
110: ft->size_root_dir = ft->cluster_size * ft->sector_size;
1.1.1.20! root 111: ft->cluster_count = (int) (((__int64) fatsecs * ft->sector_size) / (ft->cluster_size * ft->sector_size));
1.1.1.19 root 112: ft->fat_length = (ft->cluster_count * 4 + ft->sector_size - 1) / ft->sector_size;
113:
114: // Align data area on TC_MAX_VOLUME_SECTOR_SIZE
115:
116: } while (ft->sector_size == TC_SECTOR_SIZE_LEGACY
117: && (ft->reserved * ft->sector_size + ft->fat_length * ft->fats * ft->sector_size) % TC_MAX_VOLUME_SECTOR_SIZE != 0);
1.1 root 118: }
119:
1.1.1.20! root 120: ft->cluster_count -= ft->fat_length * ft->fats / ft->cluster_size;
! 121:
1.1 root 122: if (ft->num_sectors >= 65536 || ft->size_fat == 32)
123: {
124: ft->sectors = 0;
125: ft->total_sect = ft->num_sectors;
126: }
127: else
128: {
1.1.1.17 root 129: ft->sectors = (uint16) ft->num_sectors;
1.1 root 130: ft->total_sect = 0;
131: }
132: }
133:
134: void
135: PutBoot (fatparams * ft, unsigned char *boot)
136: {
137: int cnt = 0;
138:
139: boot[cnt++] = 0xeb; /* boot jump */
140: boot[cnt++] = 0x3c;
141: boot[cnt++] = 0x90;
1.1.1.6 root 142: memcpy (boot + cnt, "MSDOS5.0", 8); /* system id */
1.1 root 143: cnt += 8;
1.1.1.10 root 144: *(__int16 *)(boot + cnt) = LE16(ft->sector_size); /* bytes per sector */
1.1 root 145: cnt += 2;
1.1.1.10 root 146: boot[cnt++] = (__int8) ft->cluster_size; /* sectors per cluster */
147: *(__int16 *)(boot + cnt) = LE16(ft->reserved); /* reserved sectors */
1.1.1.6 root 148: cnt += 2;
1.1.1.10 root 149: boot[cnt++] = (__int8) ft->fats; /* 2 fats */
1.1 root 150:
151: if(ft->size_fat == 32)
152: {
153: boot[cnt++] = 0x00;
154: boot[cnt++] = 0x00;
155: }
156: else
157: {
1.1.1.10 root 158: *(__int16 *)(boot + cnt) = LE16(ft->dir_entries); /* 512 root entries */
1.1 root 159: cnt += 2;
160: }
161:
1.1.1.10 root 162: *(__int16 *)(boot + cnt) = LE16(ft->sectors); /* # sectors */
1.1 root 163: cnt += 2;
1.1.1.10 root 164: boot[cnt++] = (__int8) ft->media; /* media byte */
1.1 root 165:
166: if(ft->size_fat == 32)
167: {
168: boot[cnt++] = 0x00;
169: boot[cnt++] = 0x00;
170: }
171: else
172: {
1.1.1.17 root 173: *(__int16 *)(boot + cnt) = LE16((uint16) ft->fat_length); /* fat size */
1.1 root 174: cnt += 2;
175: }
176:
1.1.1.10 root 177: *(__int16 *)(boot + cnt) = LE16(ft->secs_track); /* # sectors per track */
1.1 root 178: cnt += 2;
1.1.1.10 root 179: *(__int16 *)(boot + cnt) = LE16(ft->heads); /* # heads */
1.1 root 180: cnt += 2;
1.1.1.10 root 181: *(__int32 *)(boot + cnt) = LE32(ft->hidden); /* # hidden sectors */
1.1.1.6 root 182: cnt += 4;
1.1.1.10 root 183: *(__int32 *)(boot + cnt) = LE32(ft->total_sect); /* # huge sectors */
1.1 root 184: cnt += 4;
185:
186: if(ft->size_fat == 32)
187: {
1.1.1.10 root 188: *(__int32 *)(boot + cnt) = LE32(ft->fat_length); cnt += 4; /* fat size 32 */
1.1.1.6 root 189: boot[cnt++] = 0x00; /* ExtFlags */
1.1 root 190: boot[cnt++] = 0x00;
191: boot[cnt++] = 0x00; /* FSVer */
192: boot[cnt++] = 0x00;
193: boot[cnt++] = 0x02; /* RootClus */
194: boot[cnt++] = 0x00;
195: boot[cnt++] = 0x00;
196: boot[cnt++] = 0x00;
197: boot[cnt++] = 0x01; /* FSInfo */
198: boot[cnt++] = 0x00;
199: boot[cnt++] = 0x06; /* BkBootSec */
200: boot[cnt++] = 0x00;
201: memset(boot+cnt, 0, 12); cnt+=12; /* Reserved */
202: }
203:
1.1.1.6 root 204: boot[cnt++] = 0x00; /* drive number */ // FIXED 80 > 00
1.1 root 205: boot[cnt++] = 0x00; /* reserved */
206: boot[cnt++] = 0x29; /* boot sig */
1.1.1.13 root 207:
1.1.1.19 root 208: memcpy (boot + cnt, ft->volume_id, 4); /* vol id */
1.1 root 209: cnt += 4;
1.1.1.13 root 210:
1.1.1.6 root 211: memcpy (boot + cnt, ft->volume_name, 11); /* vol title */
1.1 root 212: cnt += 11;
213:
214: switch(ft->size_fat) /* filesystem type */
215: {
216: case 12: memcpy (boot + cnt, "FAT12 ", 8); break;
217: case 16: memcpy (boot + cnt, "FAT16 ", 8); break;
218: case 32: memcpy (boot + cnt, "FAT32 ", 8); break;
219: }
220: cnt += 8;
221:
222: memset (boot + cnt, 0, ft->size_fat==32 ? 420:448); /* boot code */
223: cnt += ft->size_fat==32 ? 420:448;
224: boot[cnt++] = 0x55;
225: boot[cnt++] = 0xaa; /* boot sig */
226: }
227:
1.1.1.10 root 228:
1.1 root 229: /* FAT32 FSInfo */
1.1.1.17 root 230: static void PutFSInfo (unsigned char *sector, fatparams *ft)
1.1 root 231: {
1.1.1.19 root 232: memset (sector, 0, ft->sector_size);
1.1.1.6 root 233: sector[3]=0x41; /* LeadSig */
234: sector[2]=0x61;
235: sector[1]=0x52;
236: sector[0]=0x52;
237: sector[484+3]=0x61; /* StrucSig */
238: sector[484+2]=0x41;
239: sector[484+1]=0x72;
240: sector[484+0]=0x72;
1.1.1.13 root 241:
242: // Free cluster count
1.1.1.19 root 243: *(uint32 *)(sector + 488) = LE32 (ft->cluster_count - ft->size_root_dir / ft->sector_size / ft->cluster_size);
1.1.1.13 root 244:
1.1.1.17 root 245: // Next free cluster
246: *(uint32 *)(sector + 492) = LE32 (2);
247:
1.1.1.6 root 248: sector[508+3]=0xaa; /* TrailSig */
249: sector[508+2]=0x55;
250: sector[508+1]=0x00;
251: sector[508+0]=0x00;
1.1 root 252: }
253:
254:
255: int
1.1.1.8 root 256: FormatFat (unsigned __int64 startSector, fatparams * ft, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat)
1.1 root 257: {
258: int write_buf_cnt = 0;
1.1.1.19 root 259: char sector[TC_MAX_VOLUME_SECTOR_SIZE], *write_buf;
1.1.1.4 root 260: unsigned __int64 nSecNo = startSector;
1.1 root 261: int x, n;
1.1.1.6 root 262: int retVal;
1.1.1.12 root 263: char temporaryKey[MASTER_KEYDATA_SIZE];
1.1 root 264:
1.1.1.8 root 265: LARGE_INTEGER startOffset;
266: LARGE_INTEGER newOffset;
267:
1.1.1.4 root 268: // Seek to start sector
1.1.1.19 root 269: startOffset.QuadPart = startSector * ft->sector_size;
1.1.1.6 root 270: if (!SetFilePointerEx ((HANDLE) dev, startOffset, &newOffset, FILE_BEGIN)
271: || newOffset.QuadPart != startOffset.QuadPart)
1.1.1.4 root 272: {
273: return ERR_VOL_SEEKING;
274: }
1.1 root 275:
1.1.1.4 root 276: /* Write the data area */
1.1 root 277:
1.1.1.17 root 278: write_buf = (char *)TCalloc (FormatWriteBufferSize);
1.1.1.15 root 279: if (!write_buf)
280: return ERR_OUTOFMEMORY;
281:
1.1.1.19 root 282: memset (sector, 0, ft->sector_size);
283:
284: RandgetBytes (ft->volume_id, sizeof (ft->volume_id), FALSE);
1.1 root 285:
286: PutBoot (ft, (unsigned char *) sector);
1.1.1.6 root 287: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 288: cryptoInfo) == FALSE)
1.1 root 289: goto fail;
290:
291: /* fat32 boot area */
292: if (ft->size_fat == 32)
293: {
294: /* fsinfo */
1.1.1.13 root 295: PutFSInfo((unsigned char *) sector, ft);
1.1.1.6 root 296: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 297: cryptoInfo) == FALSE)
1.1 root 298: goto fail;
299:
300: /* reserved */
1.1.1.4 root 301: while (nSecNo - startSector < 6)
1.1 root 302: {
1.1.1.19 root 303: memset (sector, 0, ft->sector_size);
1.1 root 304: sector[508+3]=0xaa; /* TrailSig */
305: sector[508+2]=0x55;
1.1.1.6 root 306: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 307: cryptoInfo) == FALSE)
1.1 root 308: goto fail;
309: }
310:
311: /* bootsector backup */
1.1.1.19 root 312: memset (sector, 0, ft->sector_size);
1.1 root 313: PutBoot (ft, (unsigned char *) sector);
1.1.1.6 root 314: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 315: cryptoInfo) == FALSE)
1.1 root 316: goto fail;
317:
1.1.1.13 root 318: PutFSInfo((unsigned char *) sector, ft);
1.1.1.6 root 319: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 320: cryptoInfo) == FALSE)
1.1 root 321: goto fail;
1.1.1.6 root 322: }
1.1 root 323:
1.1.1.6 root 324: /* reserved */
1.1.1.8 root 325: while (nSecNo - startSector < (unsigned int)ft->reserved)
1.1.1.6 root 326: {
1.1.1.19 root 327: memset (sector, 0, ft->sector_size);
1.1.1.6 root 328: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 329: cryptoInfo) == FALSE)
1.1.1.6 root 330: goto fail;
1.1 root 331: }
332:
333: /* write fat */
334: for (x = 1; x <= ft->fats; x++)
335: {
336: for (n = 0; n < ft->fat_length; n++)
337: {
1.1.1.19 root 338: memset (sector, 0, ft->sector_size);
1.1 root 339:
340: if (n == 0)
341: {
342: unsigned char fat_sig[12];
343: if (ft->size_fat == 32)
344: {
345: fat_sig[0] = (unsigned char) ft->media;
346: fat_sig[1] = fat_sig[2] = 0xff;
347: fat_sig[3] = 0x0f;
348: fat_sig[4] = fat_sig[5] = fat_sig[6] = 0xff;
349: fat_sig[7] = 0x0f;
350: fat_sig[8] = fat_sig[9] = fat_sig[10] = 0xff;
351: fat_sig[11] = 0x0f;
352: memcpy (sector, fat_sig, 12);
353: }
354: else if (ft->size_fat == 16)
355: {
356: fat_sig[0] = (unsigned char) ft->media;
357: fat_sig[1] = 0xff;
358: fat_sig[2] = 0xff;
359: fat_sig[3] = 0xff;
360: memcpy (sector, fat_sig, 4);
361: }
362: else if (ft->size_fat == 12)
363: {
364: fat_sig[0] = (unsigned char) ft->media;
365: fat_sig[1] = 0xff;
366: fat_sig[2] = 0xff;
367: fat_sig[3] = 0x00;
368: memcpy (sector, fat_sig, 4);
369: }
370: }
371:
1.1.1.6 root 372: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 373: cryptoInfo) == FALSE)
1.1 root 374: goto fail;
375: }
376: }
377:
378:
379: /* write rootdir */
1.1.1.19 root 380: for (x = 0; x < ft->size_root_dir / ft->sector_size; x++)
1.1 root 381: {
1.1.1.19 root 382: memset (sector, 0, ft->sector_size);
1.1.1.6 root 383: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 384: cryptoInfo) == FALSE)
1.1 root 385: goto fail;
386:
387: }
388:
1.1.1.7 root 389: /* Fill the rest of the data area with random data */
1.1.1.4 root 390:
1.1 root 391: if(!quickFormat)
392: {
1.1.1.13 root 393: if (!FlushFormatWriteBuffer (dev, write_buf, &write_buf_cnt, &nSecNo, cryptoInfo))
394: goto fail;
395:
1.1.1.7 root 396: /* Generate a random temporary key set to be used for "dummy" encryption that will fill
397: the free disk space (data area) with random data. This is necessary for plausible
398: deniability of hidden volumes (and also reduces the amount of predictable plaintext
399: within the volume). */
1.1 root 400:
1.1.1.9 root 401: // Temporary master key
402: if (!RandgetBytes (temporaryKey, EAGetKeySize (cryptoInfo->ea), FALSE))
403: goto fail;
1.1.1.12 root 404:
405: // Temporary secondary key (XTS mode)
406: if (!RandgetBytes (cryptoInfo->k2, sizeof cryptoInfo->k2, FALSE))
1.1.1.9 root 407: goto fail;
1.1.1.6 root 408:
1.1.1.7 root 409: retVal = EAInit (cryptoInfo->ea, temporaryKey, cryptoInfo->ks);
1.1.1.12 root 410: if (retVal != ERR_SUCCESS)
1.1.1.7 root 411: {
412: burn (temporaryKey, sizeof(temporaryKey));
1.1.1.6 root 413: return retVal;
1.1.1.7 root 414: }
415: if (!EAInitMode (cryptoInfo))
416: {
417: burn (temporaryKey, sizeof(temporaryKey));
418: return ERR_MODE_INIT_FAILED;
419: }
1.1 root 420:
1.1.1.19 root 421: x = ft->num_sectors - ft->reserved - ft->size_root_dir / ft->sector_size - ft->fat_length * 2;
1.1 root 422: while (x--)
423: {
1.1.1.6 root 424: if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
1.1.1.8 root 425: cryptoInfo) == FALSE)
1.1 root 426: goto fail;
427: }
1.1.1.19 root 428: UpdateProgressBar (nSecNo * ft->sector_size);
1.1 root 429: }
1.1.1.3 root 430: else
1.1.1.19 root 431: UpdateProgressBar ((uint64) ft->num_sectors * ft->sector_size);
1.1.1.8 root 432:
1.1.1.13 root 433: if (!FlushFormatWriteBuffer (dev, write_buf, &write_buf_cnt, &nSecNo, cryptoInfo))
1.1 root 434: goto fail;
435:
436: TCfree (write_buf);
1.1.1.7 root 437: burn (temporaryKey, sizeof(temporaryKey));
1.1 root 438: return 0;
439:
1.1.1.7 root 440: fail:
1.1 root 441:
442: TCfree (write_buf);
1.1.1.7 root 443: burn (temporaryKey, sizeof(temporaryKey));
1.1 root 444: return ERR_OS_ERROR;
445: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.