text: /*
   * NETLMv2_fmt.c -- LMv2 Challenge/Response
   *
   * Written by JoMo-Kun <jmk at foofus.net> in 2008
   * and placed in the public domain.
   *
   * Performance fixes, OMP and utf-8 support by magnum 2010-2011
   *
   * This algorithm is designed for performing brute-force cracking of the LMv2
   * challenge/response sets exchanged during network-based authentication
   * attempts [1]. The captured challenge/response set from these attempts
   * should be stored using the following format:
   *
   * USERNAME::DOMAIN:SERVER CHALLENGE:LMv2 RESPONSE:CLIENT CHALLENGE
   *
   * For example:
   * Administrator::WORKGROUP:1122334455667788:6759A5A7EFB25452911DE7DE8296A0D8:F503236B200A5B3A
   *
   * It should be noted that a LMv2 authentication response is not same as a LM
   * password hash, which can be extracted using tools such as FgDump [2]. In
   * fact, a NTLM hash and not a LM hash is used within the LMv2 algorithm. LMv2
   * challenge/response authentication typically takes place when the GPO
   * "Network Security: LAN Manager authentication level" is configured to a setting
   * that enforces the use of NTLMv2, such as "Send NTLMv2 response only\refuse
   * LM & NTLM."
   *
   * LMv2 responses can be gathered via normal network capture or via tools which
   * perform layer 2 attacks, such as Ettercap [3] and Cain [4]. The responses can
   * also be harvested using a modified Samba service [5] in conjunction with
   * some trickery to convince the user to connect to it. I leave what that
   * trickery may actually be as an exercise for the reader (HINT: Karma, NMB
   * broadcasts, IE, Outlook, social engineering, ...).
   *
   * [1] http://davenport.sourceforge.net/ntlm.html#theLmv2Response
   * [2] http://www.foofus.net/~fizzgig/fgdump/
   * [3] http://ettercap.sourceforge.net/
   * [4] http://www.oxid.it/cain.html
   * [5] http://www.foofus.net/jmk/smbchallenge.html
   *
   */
  
  #if FMT_EXTERNS_H
  extern struct fmt_main fmt_NETLMv2;
  #elif FMT_REGISTERS_H
  john_register_one(&fmt_NETLMv2);
  #else
  
  #include <string.h>
  #ifdef _OPENMP
  #include <omp.h>
  #endif
  
  #include "arch.h"
  #include "misc.h"
  #include "common.h"
  #include "formats.h"
  #include "options.h"
  #include "unicode.h"
  #include "stdint.h"
  
  #include "md5.h"
  #include "hmacmd5.h"
  #include "byteorder.h"
  #include "memdbg.h"
  
  #ifndef uchar
  #define uchar unsigned char
  #endif
  
  #define FORMAT_LABEL         "netlmv2"
  #define FORMAT_NAME          "LMv2 C/R"
  #define ALGORITHM_NAME       "MD4 HMAC-MD5 32/" ARCH_BITS_STR
  #define BENCHMARK_COMMENT    ""
  #define BENCHMARK_LENGTH     0
  #define PLAINTEXT_LENGTH     125 /* lmcons.h - PWLEN (256) ? 127 ? */
  #define USERNAME_LENGTH      60 /* lmcons.h - UNLEN (256) / LM20_UNLEN (20) */
  #define DOMAIN_LENGTH        45 /* lmcons.h - CNLEN / DNLEN */
  #define BINARY_SIZE          16
  #define BINARY_ALIGN         4
  #define CHALLENGE_LENGTH     32
  #define SALT_SIZE            16 + 1 + 2 * (USERNAME_LENGTH + DOMAIN_LENGTH) + 1
  #define SALT_ALIGN           4
  #define CIPHERTEXT_LENGTH    32
  #define TOTAL_LENGTH         12 + USERNAME_LENGTH + DOMAIN_LENGTH + CHALLENGE_LENGTH + CIPHERTEXT_LENGTH
  
  // these may be altered in init() if running OMP
  #define MIN_KEYS_PER_CRYPT	1
  #define MAX_KEYS_PER_CRYPT	1
  #ifndef OMP_SCALE
  #define OMP_SCALE		1536
  #endif
  
  static struct fmt_tests tests[] = {
    {"", "1337adminPASS",         {"FOODOM\\Administrator", "", "",       "1122334455667788", "6F64C5C1E35F68DD80388C0F00F34406", "F0F3FF27037AA69F"} },
    {"$NETLMv2$ADMINISTRATORFOODOM$1122334455667788$6F64C5C1E35F68DD80388C0F00F34406$F0F3FF27037AA69F", "1337adminPASS"},
    {"$NETLMv2$USER1$1122334455667788$B1D163EA5881504F3963DC50FCDC26C1$EB4D9E8138149E20", "foobar"},
    // repeat in exactly the same format that is used in john.pot (lower case hex)
    {"$NETLMv2$USER1$1122334455667788$b1d163ea5881504f3963dc50fcdc26c1$eb4d9e8138149e20", "foobar"},
    {"$NETLMv2$ATEST$1122334455667788$83B59F1536D3321DBF1FAEC14ADB1675$A1E7281FE8C10E53", "SomeFancyP4$$w0rdHere"},
    {"", "1337adminPASS",         {"administrator",         "", "FOODOM", "1122334455667788", "6F64C5C1E35F68DD80388C0F00F34406", "F0F3FF27037AA69F"} },
    {"", "foobar",                {"user1",                 "", "",       "1122334455667788", "B1D163EA5881504F3963DC50FCDC26C1", "EB4D9E8138149E20"} },
    {"", "SomeFancyP4$$w0rdHere", {"aTest",                 "", "",       "1122334455667788", "83B59F1536D3321DBF1FAEC14ADB1675", "A1E7281FE8C10E53"} },
    {NULL}
  };
  
  static uchar (*saved_plain)[PLAINTEXT_LENGTH + 1];
  static int (*saved_len);
  static uchar (*output)[BINARY_SIZE];
  static HMACMD5Context (*saved_ctx);
  static int keys_prepared;
  static unsigned char *challenge;
  
  static void init(struct fmt_main *self)
  {
  #ifdef _OPENMP
  	int omp_t = omp_get_max_threads();
  	self->params.min_keys_per_crypt *= omp_t;
  	omp_t *= OMP_SCALE;
  	self->params.max_keys_per_crypt *= omp_t;
  #endif
  	saved_plain = mem_calloc(self->params.max_keys_per_crypt,
  	                         sizeof(*saved_plain));
  	saved_len = mem_calloc(self->params.max_keys_per_crypt,
  	                       sizeof(*saved_len));
  	output = mem_calloc(self->params.max_keys_per_crypt, sizeof(*output));
  	saved_ctx = mem_calloc(self->params.max_keys_per_crypt,
  	                       sizeof(*saved_ctx));
  }
  
  static void done(void)
  {
  	MEM_FREE(saved_ctx);
  	MEM_FREE(output);
  	MEM_FREE(saved_len);
  	MEM_FREE(saved_plain);
  }
  
  static int valid(char *ciphertext, struct fmt_main *self)
  {
    char *pos, *pos2;
  
    if (ciphertext == NULL) return 0;
    else if (strncmp(ciphertext, "$NETLMv2$", 9)!=0) return 0;
  
    pos = &ciphertext[9];
  
    /* Validate Username and Domain Length */
    for (pos2 = pos; *pos2 != '$'; pos2++)
      if ((unsigned char)*pos2 < 0x20)
        return 0;
  
    if ( !(*pos2 && (pos2 - pos <= USERNAME_LENGTH + DOMAIN_LENGTH)) )
      return 0;
  
    /* Validate Server Challenge Length */
    pos2++; pos = pos2;
    for (; *pos2 != '$'; pos2++)
      if (atoi16[ARCH_INDEX(*pos2)] == 0x7F)
        return 0;
  
    if ( !(*pos2 && (pos2 - pos == CHALLENGE_LENGTH / 2)) )
      return 0;
  
    /* Validate LMv2 Response Length */
    pos2++; pos = pos2;
    for (; *pos2 != '$'; pos2++)
      if (atoi16[ARCH_INDEX(*pos2)] == 0x7F)
        return 0;
  
    if ( !(*pos2 && (pos2 - pos == CIPHERTEXT_LENGTH)) )
      return 0;
  
    /* Validate Client Challenge Length */
    pos2++; pos = pos2;
    for (; atoi16[ARCH_INDEX(*pos2)] != 0x7F; pos2++);
    if (pos2 - pos != CHALLENGE_LENGTH / 2)
      return 0;
    if (pos2[0] != '\0')
      return 0;
  
    return 1;
  }
  
  static char *prepare(char *split_fields[10], struct fmt_main *self)
  {
  	char *srv_challenge = split_fields[3];
  	char *nethashv2     = split_fields[4];
  	char *cli_challenge = split_fields[5];
  	char *login = split_fields[0];
  	char *uid = split_fields[2];
  	char *identity = NULL, *tmp;
  
  	if (!strncmp(split_fields[1], "$NETLMv2$", 9))
  		return split_fields[1];
  	if (!split_fields[0]||!split_fields[2]||!split_fields[3]||!split_fields[4]||!split_fields[5])
  		return split_fields[1];
  
  	/* DOMAIN\USER: -or- USER::DOMAIN: */
  	if ((tmp = strstr(login, "\\")) != NULL) {
  		identity = (char *) mem_alloc(strlen(login)*2 + 1);
  		strcpy(identity, tmp + 1);
  
  		/* Upper-Case Username - Not Domain */
  		enc_strupper(identity);
  
  		strncat(identity, login, tmp - login);
  	}
  	else {
  		identity = (char *) mem_alloc(strlen(login)*2 + strlen(uid) + 1);
  		strcpy(identity, login);
  
  		enc_strupper(identity);
  
  		strcat(identity, uid);
  	}
  	tmp = (char *) mem_alloc(9 + strlen(identity) + 1 + strlen(srv_challenge) + 1 + strlen(nethashv2) + 1 + strlen(cli_challenge) + 1);
  	sprintf(tmp, "$NETLMv2$%s$%s$%s$%s", identity, srv_challenge, nethashv2, cli_challenge);
  	MEM_FREE(identity);
  
  	if (valid(tmp, self)) {
  		char *cp = str_alloc_copy(tmp);
  		MEM_FREE(tmp);
  		return cp;
  	}
  	MEM_FREE(tmp);
  	return split_fields[1];
  }
  
  
  static char *split(char *ciphertext, int index, struct fmt_main *self)
  {
    static char out[TOTAL_LENGTH + 1];
    char *pos = NULL;
    int identity_length = 0;
  
    /* Calculate identity length */
    for (pos = ciphertext + 9; *pos != '$'; pos++);
    identity_length = pos - (ciphertext + 9);
  
    memset(out, 0, TOTAL_LENGTH + 1);
    memcpy(out, ciphertext, strlen(ciphertext));
    strlwr(&out[10 + identity_length]); /* Exclude: $NETLMv2$USERDOMAIN$ */
  
    return out;
  }
  
  static void *get_binary(char *ciphertext)
  {
    static uchar *binary;
    char *pos = NULL;
    int i, identity_length;
  
    if (!binary) binary = mem_alloc_tiny(BINARY_SIZE, MEM_ALIGN_WORD);
  
    for (pos = ciphertext + 9; *pos != '$'; pos++);
    identity_length = pos - (ciphertext + 9);
  
    ciphertext += 9 + identity_length + 1 + CHALLENGE_LENGTH / 2 + 1;
    for (i=0; i<BINARY_SIZE; i++)
    {
      binary[i] = (atoi16[ARCH_INDEX(ciphertext[i*2])])<<4;
      binary[i] |= (atoi16[ARCH_INDEX(ciphertext[i*2+1])]);
    }
  
    return binary;
  }
  
  /* Calculate the LMv2 response for the given challenge, using the
     specified authentication identity (username and domain), password
     and client nonce.
  */
  static int crypt_all(int *pcount, struct db_salt *salt)
  {
  	const int count = *pcount;
  	int i = 0;
  
  #ifdef _OPENMP
  #pragma omp parallel for
  	for(i = 0; i < count; i++)
  #endif
  	{
  		unsigned char ntlm_v2_hash[16];
  		HMACMD5Context ctx; // can't be moved above the OMP pragma
  
  		if (!keys_prepared) {
  			int len;
  			unsigned char ntlm[16];
  			/* Generate 16-byte NTLM hash */
  			len = E_md4hash(saved_plain[i], saved_len[i], ntlm);
  
  			// We do key setup of the next HMAC_MD5 here (once per salt)
  			hmac_md5_init_K16(ntlm, &saved_ctx[i]);
  
  			if (len <= 0)
  				saved_plain[i][-len] = 0; // match truncation
  		}
  
  		/* HMAC-MD5(Username + Domain, NTLM Hash) */
  		memcpy(&ctx, &saved_ctx[i], sizeof(ctx));
  		hmac_md5_update(&challenge[17], (int)challenge[16], &ctx);
  		hmac_md5_final(ntlm_v2_hash, &ctx);
  
  		/* Generate 16-byte non-client nonce portion of LMv2 Response */
  		/* HMAC-MD5(Challenge + Nonce, NTLMv2 Hash) + Nonce */
  		hmac_md5(ntlm_v2_hash, challenge, 16, (unsigned char*)output[i]);
  	}
  	keys_prepared = 1;
  
  	return count;
  }
  
  static int cmp_all(void *binary, int count)
  {
  	int index;
  	for(index=0; index<count; index++)
  		if (!memcmp(output[index], binary, BINARY_SIZE))
  			return 1;
  	return 0;
  }
  
  static int cmp_one(void *binary, int index)
  {
  	return !memcmp(output[index], binary, BINARY_SIZE);
  }
  
  static int cmp_exact(char *source, int index)
  {
  	return !memcmp(output[index], get_binary(source), BINARY_SIZE);
  }
  
  /* We're essentially using three salts, but we're going to pack it into a single blob for now.
     |Client Challenge (8 Bytes)|Server Challenge (8 Bytes)|Unicode(Username (<=20).Domain (<=15))
  */
  static void *get_salt(char *ciphertext)
  {
    static unsigned char *binary_salt;
    unsigned char identity[USERNAME_LENGTH + DOMAIN_LENGTH + 1];
    UTF16 identity_ucs2[USERNAME_LENGTH + DOMAIN_LENGTH + 1];
    int i, identity_length;
    int identity_ucs2_length;
    char *pos = NULL;
  
    if (!binary_salt) binary_salt = mem_alloc_tiny(SALT_SIZE, MEM_ALIGN_WORD);
  
    memset(binary_salt, 0, SALT_SIZE);
    /* Calculate identity length */
    for (pos = ciphertext + 9; *pos != '$'; pos++);
    identity_length = pos - (ciphertext + 9);
  
    /* Convert identity (username + domain) string to NT unicode */
    strnzcpy((char *)identity, ciphertext + 9, sizeof(identity));
    identity_ucs2_length = enc_to_utf16((UTF16 *)identity_ucs2, USERNAME_LENGTH + DOMAIN_LENGTH, (UTF8 *)identity, identity_length) * sizeof(int16_t);
  
    if (identity_ucs2_length < 0) // Truncated at Unicode conversion.
  	  identity_ucs2_length = strlen16((UTF16 *)identity_ucs2) * sizeof(int16_t);
  
    binary_salt[16] = (unsigned char)identity_ucs2_length;
    memcpy(&binary_salt[17], (char *)identity_ucs2, identity_ucs2_length);
  
    /* Set server challenge */
    ciphertext += 10 + identity_length;
  
    for (i = 0; i < 8; i++)
      binary_salt[i] = (atoi16[ARCH_INDEX(ciphertext[i*2])] << 4) + atoi16[ARCH_INDEX(ciphertext[i*2+1])];
  
    /* Set client challenge */
    ciphertext += 2 + CHALLENGE_LENGTH / 2 + CIPHERTEXT_LENGTH;
  
    for (i = 0; i < 8; ++i)
      binary_salt[i + 8] = (atoi16[ARCH_INDEX(ciphertext[i*2])] << 4) + atoi16[ARCH_INDEX(ciphertext[i*2+1])];
  
    /* Return a concatenation of the server and client challenges and the identity value */
    return (void*)binary_salt;
  }
  
  static void set_salt(void *salt)
  {
  	challenge = salt;
  }
  
  static void set_key(char *key, int index)
  {
  	saved_len[index] = strlen(key);
  	memcpy((char *)saved_plain[index], key, saved_len[index] + 1);
  	keys_prepared = 0;
  }
  
  static char *get_key(int index)
  {
    return (char *)saved_plain[index];
  }
  
  static int salt_hash(void *salt)
  {
  	// Hash the client challenge (in case server salt was spoofed)
  	return (*(ARCH_WORD_32 *)salt+8) & (SALT_HASH_SIZE - 1);
  }
  
  static int get_hash_0(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_0;
  }
  
  static int get_hash_1(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_1;
  }
  
  static int get_hash_2(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_2;
  }
  
  static int get_hash_3(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_3;
  }
  
  static int get_hash_4(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_4;
  }
  
  static int get_hash_5(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_5;
  }
  
  static int get_hash_6(int index)
  {
  	return *(ARCH_WORD_32 *)output[index] & PH_MASK_6;
  }
  
  struct fmt_main fmt_NETLMv2 = {
  	{
  		FORMAT_LABEL,
  		FORMAT_NAME,
  		ALGORITHM_NAME,
  		BENCHMARK_COMMENT,
  		BENCHMARK_LENGTH,
  		0,
  		PLAINTEXT_LENGTH,
  		BINARY_SIZE,
  		BINARY_ALIGN,
  		SALT_SIZE,
  		SALT_ALIGN,
  		MIN_KEYS_PER_CRYPT,
  		MAX_KEYS_PER_CRYPT,
  		FMT_CASE | FMT_8_BIT | FMT_SPLIT_UNIFIES_CASE | FMT_OMP | FMT_UNICODE | FMT_UTF8,
  		{ NULL },
  		tests
  	}, {
  		init,
  		done,
  		fmt_default_reset,
  		prepare,
  		valid,
  		split,
  		get_binary,
  		get_salt,
  		{ NULL },
  		fmt_default_source,
  		{
  			fmt_default_binary_hash_0,
  			fmt_default_binary_hash_1,
  			fmt_default_binary_hash_2,
  			fmt_default_binary_hash_3,
  			fmt_default_binary_hash_4,
  			fmt_default_binary_hash_5,
  			fmt_default_binary_hash_6
  		},
  		salt_hash,
  		NULL,
  		set_salt,
  		set_key,
  		get_key,
  		fmt_default_clear_keys,
  		crypt_all,
  		{
  			get_hash_0,
  			get_hash_1,
  			get_hash_2,
  			get_hash_3,
  			get_hash_4,
  			get_hash_5,
  			get_hash_6
  		},
  		cmp_all,
  		cmp_one,
  		cmp_exact
  	}
  };
  
  #endif /* plugin stanza */
  