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TrueCrypt/VeraCrypt cracking: Do an entropy check on the TC/VC header on start

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This commit is contained in:
jsteube 2018-07-31 16:18:45 +02:00
parent c1ebfe486f
commit bdec457951
7 changed files with 109 additions and 37 deletions
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1
docs/changes.txt
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@ -21,6 +21,7 @@
- OpenCL kernels: Removed the use of 'volatile' in inline assembly instructions where it is not needed
- OpenCL kernels: Switched array pointer types in function declarations in order to be compatible with OpenCL 2.0
- SIP cracking: Increased the nonce field to allow a salt of 1024 bytes
- TrueCrypt/VeraCrypt cracking: Do an entropy check on the TC/VC header on start
##
## Bugs

6
include/interface.h
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@ -19,6 +19,12 @@
static const char LM_ZERO_HASH[] = "aad3b435b51404ee";
static const char LM_MASKED_PLAIN[] = "[notfound]";
/**
* entropy check (truecrypt, veracrypt, ...)
*/
static const float MIN_SUFFICIENT_ENTROPY_FILE = 7.0f;
/**
* algo specific
*/

4
include/shared.h
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@ -13,6 +13,7 @@
#include <time.h>
#include <fcntl.h>
#include <ctype.h>
#include <math.h>
bool overflow_check_u32_add (const u32 a, const u32 b);
bool overflow_check_u32_mul (const u32 a, const u32 b);
@ -70,4 +71,7 @@ u64 round_up_multiple_64 (const u64 v, const u64 m);
void hc_strncat (u8 *dst, u8 *src, const size_t n);
int count_char (const u8 *buf, const int len, const u8 c);
float get_entropy (const u8 *buf, const int len);
#endif // _SHARED_H

75
include/types.h
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@ -448,43 +448,44 @@ typedef enum outfile_fmt
typedef enum parser_rc
{
PARSER_OK = 0,
PARSER_COMMENT = -1,
PARSER_GLOBAL_ZERO = -2,
PARSER_GLOBAL_LENGTH = -3,
PARSER_HASH_LENGTH = -4,
PARSER_HASH_VALUE = -5,
PARSER_SALT_LENGTH = -6,
PARSER_SALT_VALUE = -7,
PARSER_SALT_ITERATION = -8,
PARSER_SEPARATOR_UNMATCHED = -9,
PARSER_SIGNATURE_UNMATCHED = -10,
PARSER_HCCAPX_FILE_SIZE = -11,
PARSER_HCCAPX_EAPOL_LEN = -12,
PARSER_PSAFE2_FILE_SIZE = -13,
PARSER_PSAFE3_FILE_SIZE = -14,
PARSER_TC_FILE_SIZE = -15,
PARSER_VC_FILE_SIZE = -16,
PARSER_SIP_AUTH_DIRECTIVE = -17,
PARSER_HASH_FILE = -18,
PARSER_HASH_ENCODING = -19,
PARSER_SALT_ENCODING = -20,
PARSER_LUKS_FILE_SIZE = -21,
PARSER_LUKS_MAGIC = -22,
PARSER_LUKS_VERSION = -23,
PARSER_LUKS_CIPHER_TYPE = -24,
PARSER_LUKS_CIPHER_MODE = -25,
PARSER_LUKS_HASH_TYPE = -26,
PARSER_LUKS_KEY_SIZE = -27,
PARSER_LUKS_KEY_DISABLED = -28,
PARSER_LUKS_KEY_STRIPES = -29,
PARSER_LUKS_HASH_CIPHER = -30,
PARSER_HCCAPX_SIGNATURE = -31,
PARSER_HCCAPX_VERSION = -32,
PARSER_HCCAPX_MESSAGE_PAIR = -33,
PARSER_TOKEN_ENCODING = -34,
PARSER_TOKEN_LENGTH = -35,
PARSER_UNKNOWN_ERROR = -255
PARSER_OK = 0,
PARSER_COMMENT = -1,
PARSER_GLOBAL_ZERO = -2,
PARSER_GLOBAL_LENGTH = -3,
PARSER_HASH_LENGTH = -4,
PARSER_HASH_VALUE = -5,
PARSER_SALT_LENGTH = -6,
PARSER_SALT_VALUE = -7,
PARSER_SALT_ITERATION = -8,
PARSER_SEPARATOR_UNMATCHED = -9,
PARSER_SIGNATURE_UNMATCHED = -10,
PARSER_HCCAPX_FILE_SIZE = -11,
PARSER_HCCAPX_EAPOL_LEN = -12,
PARSER_PSAFE2_FILE_SIZE = -13,
PARSER_PSAFE3_FILE_SIZE = -14,
PARSER_TC_FILE_SIZE = -15,
PARSER_VC_FILE_SIZE = -16,
PARSER_SIP_AUTH_DIRECTIVE = -17,
PARSER_HASH_FILE = -18,
PARSER_HASH_ENCODING = -19,
PARSER_SALT_ENCODING = -20,
PARSER_LUKS_FILE_SIZE = -21,
PARSER_LUKS_MAGIC = -22,
PARSER_LUKS_VERSION = -23,
PARSER_LUKS_CIPHER_TYPE = -24,
PARSER_LUKS_CIPHER_MODE = -25,
PARSER_LUKS_HASH_TYPE = -26,
PARSER_LUKS_KEY_SIZE = -27,
PARSER_LUKS_KEY_DISABLED = -28,
PARSER_LUKS_KEY_STRIPES = -29,
PARSER_LUKS_HASH_CIPHER = -30,
PARSER_HCCAPX_SIGNATURE = -31,
PARSER_HCCAPX_VERSION = -32,
PARSER_HCCAPX_MESSAGE_PAIR = -33,
PARSER_TOKEN_ENCODING = -34,
PARSER_TOKEN_LENGTH = -35,
PARSER_INSUFFICIENT_ENTROPY = -36,
PARSER_UNKNOWN_ERROR = -255
} parser_rc_t;

4
src/Makefile
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@ -228,6 +228,7 @@ LFLAGS_NATIVE := $(LFLAGS)
LFLAGS_NATIVE += -lpthread
LFLAGS_NATIVE += -ldl
LFLAGS_NATIVE += -lrt
LFLAGS_NATIVE += -lm
endif # Linux
ifeq ($(UNAME),FreeBSD)
@ -236,6 +237,7 @@ CFLAGS_NATIVE := $(CFLAGS)
CFLAGS_NATIVE += -I$(OPENCL_HEADERS_KHRONOS)/
LFLAGS_NATIVE := $(LFLAGS)
LFLAGS_NATIVE += -lpthread
LFLAGS_NATIVE += -lm
endif
endif # FreeBSD
@ -300,9 +302,11 @@ CFLAGS_CROSS_WIN64 += -DWITH_HWMON
LFLAGS_CROSS_LINUX32 := $(LFLAGS)
LFLAGS_CROSS_LINUX32 += -lpthread
LFLAGS_CROSS_LINUX32 += -ldl
LFLAGS_CROSS_LINUX32 += -lm
LFLAGS_CROSS_LINUX64 := $(LFLAGS)
LFLAGS_CROSS_LINUX64 += -lpthread
LFLAGS_CROSS_LINUX64 += -ldl
LFLAGS_CROSS_LINUX64 += -lm
LFLAGS_CROSS_WIN32 := $(LFLAGS)
LFLAGS_CROSS_WIN32 += -Wl,--dynamicbase -Wl,--nxcompat
LFLAGS_CROSS_WIN32 += -lpsapi

26
src/interface.c
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@ -341,6 +341,7 @@ static const char *PA_032 = "Invalid hccapx version";
static const char *PA_033 = "Invalid hccapx message pair";
static const char *PA_034 = "Token encoding exception";
static const char *PA_035 = "Token length exception";
static const char *PA_036 = "Insufficient entropy exception";
static const char *PA_255 = "Unknown error";
static const char *HT_00000 = "MD5";
@ -6755,6 +6756,10 @@ int truecrypt_parse_hash_1k (u8 *input_buf, u32 input_len, hash_t *hash_buf, MAY
if (n != sizeof (buf)) return (PARSER_TC_FILE_SIZE);
const float entropy = get_entropy (buf, n);
if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);
memcpy (tc->salt_buf, buf, 64);
memcpy (tc->data_buf, buf + 64, 512 - 64);
@ -6794,6 +6799,10 @@ int truecrypt_parse_hash_2k (u8 *input_buf, u32 input_len, hash_t *hash_buf, MAY
if (n != sizeof (buf)) return (PARSER_TC_FILE_SIZE);
const float entropy = get_entropy (buf, n);
if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);
memcpy (tc->salt_buf, buf, 64);
memcpy (tc->data_buf, buf + 64, 512 - 64);
@ -6833,6 +6842,10 @@ int veracrypt_parse_hash_200000 (u8 *input_buf, u32 input_len, hash_t *hash_buf,
if (n != sizeof (buf)) return (PARSER_VC_FILE_SIZE);
const float entropy = get_entropy (buf, n);
if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);
memcpy (tc->salt_buf, buf, 64);
memcpy (tc->data_buf, buf + 64, 512 - 64);
@ -6872,6 +6885,10 @@ int veracrypt_parse_hash_500000 (u8 *input_buf, u32 input_len, hash_t *hash_buf,
if (n != sizeof (buf)) return (PARSER_VC_FILE_SIZE);
const float entropy = get_entropy (buf, n);
if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);
memcpy (tc->salt_buf, buf, 64);
memcpy (tc->data_buf, buf + 64, 512 - 64);
@ -6911,6 +6928,10 @@ int veracrypt_parse_hash_327661 (u8 *input_buf, u32 input_len, hash_t *hash_buf,
if (n != sizeof (buf)) return (PARSER_VC_FILE_SIZE);
const float entropy = get_entropy (buf, n);
if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);
memcpy (tc->salt_buf, buf, 64);
memcpy (tc->data_buf, buf + 64, 512 - 64);
@ -6950,6 +6971,10 @@ int veracrypt_parse_hash_655331 (u8 *input_buf, u32 input_len, hash_t *hash_buf,
if (n != sizeof (buf)) return (PARSER_VC_FILE_SIZE);
const float entropy = get_entropy (buf, n);
if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);
memcpy (tc->salt_buf, buf, 64);
memcpy (tc->data_buf, buf + 64, 512 - 64);
@ -18255,6 +18280,7 @@ const char *strparser (const u32 parser_status)
case PARSER_HCCAPX_MESSAGE_PAIR: return PA_033;
case PARSER_TOKEN_ENCODING: return PA_034;
case PARSER_TOKEN_LENGTH: return PA_035;
case PARSER_INSUFFICIENT_ENTROPY: return PA_036;
}
return PA_255;

30
src/shared.c
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@ -679,3 +679,33 @@ void hc_strncat (u8 *dst, u8 *src, const size_t n)
*dst_ptr = 0;
}
int count_char (const u8 *buf, const int len, const u8 c)
{
int r = 0;
for (int i = 0; i < len; i++)
{
if (buf[i] == c) r++;
}
return r;
}
float get_entropy (const u8 *buf, const int len)
{
float entropy = 0.0;
for (int c = 0; c < 256; c++)
{
const int r = count_char (buf, len, (const u8) c);
if (r == 0) continue;
float w = (float) r / len;
entropy += -w * log2 (w);
}
return entropy;
}