VeraCrypt
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path: root/src/Boot/Windows/BootCommon.h
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/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file) 
 and all other portions of this file are Copyright (c) 2013-2015 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#ifndef TC_HEADER_Boot_BootCommon
#define TC_HEADER_Boot_BootCommon

#include "Common/Password.h"
#include "BootDefs.h"

// The user will be advised to upgrade the rescue disk if upgrading from the following or any previous version
#define TC_RESCUE_DISK_UPGRADE_NOTICE_MAX_VERSION 0x0113

#define TC_BOOT_LOADER_AREA_SIZE (TC_BOOT_LOADER_AREA_SECTOR_COUNT * TC_SECTOR_SIZE_BIOS)

#define TC_BOOT_VOLUME_HEADER_SECTOR (TC_BOOT_LOADER_AREA_SECTOR_COUNT - 1)
#define TC_BOOT_VOLUME_HEADER_SECTOR_OFFSET (TC_BOOT_VOLUME_HEADER_SECTOR * TC_SECTOR_SIZE_BIOS)

#define TC_CD_BOOTSECTOR_OFFSET 0xd000
#define TC_CD_BOOT_LOADER_SECTOR 26

#define TC_ORIG_BOOT_LOADER_BACKUP_SECTOR TC_BOOT_LOADER_AREA_SECTOR_COUNT
#define TC_ORIG_BOOT_LOADER_BACKUP_SECTOR_OFFSET (TC_ORIG_BOOT_LOADER_BACKUP_SECTOR * TC_SECTOR_SIZE_BIOS)

#define TC_BOOT_LOADER_BACKUP_RESCUE_DISK_SECTOR (TC_ORIG_BOOT_LOADER_BACKUP_SECTOR + TC_BOOT_LOADER_AREA_SECTOR_COUNT)
#define TC_BOOT_LOADER_BACKUP_RESCUE_DISK_SECTOR_OFFSET (TC_BOOT_LOADER_BACKUP_RESCUE_DISK_SECTOR * TC_SECTOR_SIZE_BIOS)

#define TC_MBR_SECTOR 0
#define TC_MAX_MBR_BOOT_CODE_SIZE 440

#define TC_MAX_EXTRA_BOOT_PARTITION_SIZE (512UL * 1024UL * 1024UL)


#pragma pack (1)

typedef struct
{
	byte Flags;
} BootSectorConfiguration;


// Modifying this value can introduce incompatibility with previous versions
#define TC_BOOT_LOADER_ARGS_OFFSET 0x10

typedef struct
{
	// Modifying this structure can introduce incompatibility with previous versions
	char Signature[8];
	uint16 BootLoaderVersion;
	uint16 CryptoInfoOffset;
	uint16 CryptoInfoLength;
	uint32 HeaderSaltCrc32;
	Password BootPassword;
	uint64 HiddenSystemPartitionStart;
	uint64 DecoySystemPartitionStart;
	uint32 Flags;
	uint32 BootDriveSignature;

	uint32 BootArgumentsCrc32;

} BootArguments;

// Modifying these values can introduce incompatibility with previous versions
#define TC_BOOT_ARGS_FLAG_EXTRA_BOOT_PARTITION				0x1

#pragma pack ()

// Boot arguments signature should not be defined as a static string
// Modifying these values can introduce incompatibility with previous versions
#define TC_SET_BOOT_ARGUMENTS_SIGNATURE(SG) do { SG[0]  = 'T';   SG[1]  = 'R';   SG[2]  = 'U';   SG[3]  = 'E';   SG[4]  = 0x11;   SG[5]  = 0x23;   SG[6]  = 0x45;   SG[7]  = 0x66; } while (FALSE)
#define TC_IS_BOOT_ARGUMENTS_SIGNATURE(SG)      (SG[0] == 'T' && SG[1] == 'R' && SG[2] == 'U' && SG[3] == 'E' && SG[4] == 0x11 && SG[5] == 0x23 && SG[6] == 0x45 && SG[7] == 0x66)


#endif // TC_HEADER_Boot_BootCommon
ors may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <stdlib.h> #include <string.h> #include "zipint.h" struct trad_pkware { zip_error_t error; zip_uint32_t key[3]; }; #define HEADERLEN 12 #define KEY0 305419896 #define KEY1 591751049 #define KEY2 878082192 static void decrypt(struct trad_pkware *, zip_uint8_t *, const zip_uint8_t *, zip_uint64_t, int); static int decrypt_header(zip_source_t *, struct trad_pkware *); static zip_int64_t pkware_decrypt(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t); static void pkware_free(struct trad_pkware *); zip_source_t * zip_source_pkware(zip_t *za, zip_source_t *src, zip_uint16_t em, int flags, const char *password) { struct trad_pkware *ctx; zip_source_t *s2; if (password == NULL || src == NULL || em != ZIP_EM_TRAD_PKWARE) { zip_error_set(&za->error, ZIP_ER_INVAL, 0); return NULL; } if (flags & ZIP_CODEC_ENCODE) { zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0); return NULL; } if ((ctx = (struct trad_pkware *)malloc(sizeof(*ctx))) == NULL) { zip_error_set(&za->error, ZIP_ER_MEMORY, 0); return NULL; } zip_error_init(&ctx->error); ctx->key[0] = KEY0; ctx->key[1] = KEY1; ctx->key[2] = KEY2; decrypt(ctx, NULL, (const zip_uint8_t *)password, strlen(password), 1); if ((s2 = zip_source_layered(za, src, pkware_decrypt, ctx)) == NULL) { pkware_free(ctx); return NULL; } return s2; } static void decrypt(struct trad_pkware *ctx, zip_uint8_t *out, const zip_uint8_t *in, zip_uint64_t len, int update_only) { zip_uint16_t tmp; zip_uint64_t i; Bytef b; for (i = 0; i < len; i++) { b = in[i]; if (!update_only) { /* decrypt next byte */ tmp = (zip_uint16_t)(ctx->key[2] | 2); tmp = (zip_uint16_t)(((zip_uint32_t)tmp * (tmp ^ 1)) >> 8); b ^= (Bytef)tmp; } /* store cleartext */ if (out) out[i] = b; /* update keys */ ctx->key[0] = (zip_uint32_t)crc32(ctx->key[0] ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL; ctx->key[1] = (ctx->key[1] + (ctx->key[0] & 0xff)) * 134775813 + 1; b = (Bytef)(ctx->key[1] >> 24); ctx->key[2] = (zip_uint32_t)crc32(ctx->key[2] ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL; } } static int decrypt_header(zip_source_t *src, struct trad_pkware *ctx) { zip_uint8_t header[HEADERLEN]; struct zip_stat st; zip_int64_t n; unsigned short dostime, dosdate; if ((n = zip_source_read(src, header, HEADERLEN)) < 0) { _zip_error_set_from_source(&ctx->error, src); return -1; } if (n != HEADERLEN) { zip_error_set(&ctx->error, ZIP_ER_EOF, 0); return -1; } decrypt(ctx, header, header, HEADERLEN, 0); if (zip_source_stat(src, &st) < 0) { /* stat failed, skip password validation */ return 0; } _zip_u2d_time(st.mtime, &dostime, &dosdate); if (header[HEADERLEN - 1] != st.crc >> 24 && header[HEADERLEN - 1] != dostime >> 8) { zip_error_set(&ctx->error, ZIP_ER_WRONGPASSWD, 0); return -1; } return 0; } static zip_int64_t pkware_decrypt(zip_source_t *src, void *ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd) { struct trad_pkware *ctx; zip_int64_t n; ctx = (struct trad_pkware *)ud; switch (cmd) { case ZIP_SOURCE_OPEN: if (decrypt_header(src, ctx) < 0) return -1; return 0; case ZIP_SOURCE_READ: if ((n = zip_source_read(src, data, len)) < 0) { _zip_error_set_from_source(&ctx->error, src); return -1; } decrypt((struct trad_pkware *)ud, (zip_uint8_t *)data, (zip_uint8_t *)data, (zip_uint64_t)n, 0); return n; case ZIP_SOURCE_CLOSE: return 0; case ZIP_SOURCE_STAT: { zip_stat_t *st; st = (zip_stat_t *)data; st->encryption_method = ZIP_EM_NONE; st->valid |= ZIP_STAT_ENCRYPTION_METHOD; /* TODO: deduce HEADERLEN from size for uncompressed */ if (st->valid & ZIP_STAT_COMP_SIZE) st->comp_size -= HEADERLEN; return 0; } case ZIP_SOURCE_SUPPORTS: return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, -1); case ZIP_SOURCE_ERROR: return zip_error_to_data(&ctx->error, data, len); case ZIP_SOURCE_FREE: pkware_free(ctx); return 0; default: zip_error_set(&ctx->error, ZIP_ER_INVAL, 0); return -1; } } static void pkware_free(struct trad_pkware *ctx) { free(ctx); }