/**
 * Author......: See docs/credits.txt
 * License.....: MIT
 */

#include "common.h"
#include "types.h"
#include "modules.h"
#include "bitops.h"
#include "convert.h"
#include "shared.h"
#include "emu_inc_cipher_des.h"
#include "emu_inc_hash_md5.h"

static const u32   ATTACK_EXEC    = ATTACK_EXEC_INSIDE_KERNEL;
static const u32   DGST_POS0      = 0;
static const u32   DGST_POS1      = 3;
static const u32   DGST_POS2      = 2;
static const u32   DGST_POS3      = 1;
static const u32   DGST_SIZE      = DGST_SIZE_4_4;
static const u32   HASH_CATEGORY  = HASH_CATEGORY_NETWORK_PROTOCOL;
static const char *HASH_NAME      = "NetNTLMv2";
static const u64   KERN_TYPE      = 5600;
static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE;
static const u64   OPTS_TYPE      = OPTS_TYPE_STOCK_MODULE
                                  | OPTS_TYPE_PT_GENERATE_LE
                                  | OPTS_TYPE_PT_ADD80
                                  | OPTS_TYPE_PT_ADDBITS14
                                  | OPTS_TYPE_PT_UTF16LE;
static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
static const char *ST_PASS        = "hashcat";
static const char *ST_HASH        = "0UL5G37JOI0SX::6VB1IS0KA74:ebe1afa18b7fbfa6:aab8bf8675658dd2a939458a1077ba08:010100000000000031c8aa092510945398b9f7b7dde1a9fb00000000f7876f2b04b700";

typedef struct netntlm
{
  int user_len;
  int domain_len;
  int srvchall_len;
  int clichall_len;

  u32 userdomain_buf[64];
  u32 chall_buf[256];

} netntlm_t;

u32         module_attack_exec    (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ATTACK_EXEC;     }
u32         module_dgst_pos0      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS0;       }
u32         module_dgst_pos1      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS1;       }
u32         module_dgst_pos2      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS2;       }
u32         module_dgst_pos3      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS3;       }
u32         module_dgst_size      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_SIZE;       }
u32         module_hash_category  (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_CATEGORY;   }
const char *module_hash_name      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_NAME;       }
u64         module_kern_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return KERN_TYPE;       }
u32         module_opti_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTI_TYPE;       }
u64         module_opts_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTS_TYPE;       }
u32         module_salt_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return SALT_TYPE;       }
const char *module_st_hash        (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_HASH;         }
const char *module_st_pass        (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_PASS;         }

u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
  const u64 esalt_size = (const u64) sizeof (netntlm_t);

  return esalt_size;
}

int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED void *digest_buf, MAYBE_UNUSED salt_t *salt, MAYBE_UNUSED void *esalt_buf, MAYBE_UNUSED void *hook_salt_buf, MAYBE_UNUSED hashinfo_t *hash_info, const char *line_buf, MAYBE_UNUSED const int line_len)
{
  u32 *digest = (u32 *) digest_buf;

  netntlm_t *netntlm = (netntlm_t *) esalt_buf;

  hc_token_t token;

  memset (&token, 0, sizeof (hc_token_t));

  token.token_cnt  = 6;

  // username
  token.sep[0]     = ':';
  token.len_min[0] = 0;
  token.len_max[0] = 60;
  token.attr[0]    = TOKEN_ATTR_VERIFY_LENGTH;

  // unused
  token.sep[1]     = ':';
  token.len[1]     = 0;
  token.attr[1]    = TOKEN_ATTR_FIXED_LENGTH;

  // domain
  token.len_min[2] = 0;
  token.len_max[2] = 45;
  token.sep[2]     = ':';
  token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH;

  // lm response
  token.sep[3]     = ':';
  token.len[3]     = 16;
  token.attr[3]    = TOKEN_ATTR_FIXED_LENGTH
                   | TOKEN_ATTR_VERIFY_HEX;

  // ntlm response
  token.sep[4]     = ':';
  token.len[4]     = 32;
  token.attr[4]    = TOKEN_ATTR_FIXED_LENGTH
                   | TOKEN_ATTR_VERIFY_HEX;

  // challenge
  token.sep[5]     = ':';
  token.len_min[5] = 2;
  token.len_max[5] = 1024;
  token.attr[5]    = TOKEN_ATTR_VERIFY_LENGTH
                   | TOKEN_ATTR_VERIFY_HEX;

  const int rc_tokenizer = input_tokenizer ((const u8 *) line_buf, line_len, &token);

  if (rc_tokenizer != PARSER_OK) return (rc_tokenizer);

  const u8 *user_pos     = token.buf[0];
  const u8 *domain_pos   = token.buf[2];
  const u8 *srvchall_pos = token.buf[3];
  const u8 *hash_pos     = token.buf[4];
  const u8 *clichall_pos = token.buf[5];

  const int user_len     = token.len[0];
  const int domain_len   = token.len[2];
  const int srvchall_len = token.len[3];
  const int clichall_len = token.len[5];

  /**
   * store some data for later use
   */

  netntlm->user_len     = user_len     * 2;
  netntlm->domain_len   = domain_len   * 2;
  netntlm->srvchall_len = srvchall_len / 2;
  netntlm->clichall_len = clichall_len / 2;

  u8 *userdomain_ptr = (u8 *) netntlm->userdomain_buf;
  u8 *chall_ptr      = (u8 *) netntlm->chall_buf;

  /**
   * handle username and domainname
   */

  for (int i = 0; i < user_len; i++)
  {
    *userdomain_ptr++ = toupper (user_pos[i]);
    *userdomain_ptr++ = 0;
  }

  for (int i = 0; i < domain_len; i++)
  {
    *userdomain_ptr++ = domain_pos[i];
    *userdomain_ptr++ = 0;
  }

  *userdomain_ptr++ = 0x80;

  /**
   * handle server challenge encoding
   */

  for (int i = 0; i < srvchall_len; i += 2)
  {
    const u8 p0 = srvchall_pos[i + 0];
    const u8 p1 = srvchall_pos[i + 1];

    *chall_ptr++ = hex_convert (p1) << 0
                 | hex_convert (p0) << 4;
  }

  /**
   * handle client challenge encoding
   */

  for (int i = 0; i < clichall_len; i += 2)
  {
    const u8 p0 = clichall_pos[i + 0];
    const u8 p1 = clichall_pos[i + 1];

    *chall_ptr++ = hex_convert (p1) << 0
                 | hex_convert (p0) << 4;
  }

  *chall_ptr++ = 0x80;

  /**
   * handle hash itself
   */

  digest[0] = hex_to_u32 (hash_pos +  0);
  digest[1] = hex_to_u32 (hash_pos +  8);
  digest[2] = hex_to_u32 (hash_pos + 16);
  digest[3] = hex_to_u32 (hash_pos + 24);

  /**
   * reuse challenge data as salt_buf, its the buffer that is most likely unique
   */

  salt->salt_buf[0] = 0;
  salt->salt_buf[1] = 0;
  salt->salt_buf[2] = 0;
  salt->salt_buf[3] = 0;
  salt->salt_buf[4] = 0;
  salt->salt_buf[5] = 0;
  salt->salt_buf[6] = 0;
  salt->salt_buf[7] = 0;

  u32 *uptr;

  uptr = (u32 *) netntlm->userdomain_buf;

  for (u32 i = 0; i < 64; i += 16, uptr += 16)
  {
    md5_transform (uptr + 0, uptr + 4, uptr + 8, uptr + 12, salt->salt_buf);
  }

  uptr = (u32 *) netntlm->chall_buf;

  for (u32 i = 0; i < 256; i += 16, uptr += 16)
  {
    md5_transform (uptr + 0, uptr + 4, uptr + 8, uptr + 12, salt->salt_buf);
  }

  salt->salt_len = 16;

  return (PARSER_OK);
}

int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const void *digest_buf, MAYBE_UNUSED const salt_t *salt, MAYBE_UNUSED const void *esalt_buf, MAYBE_UNUSED const void *hook_salt_buf, MAYBE_UNUSED const hashinfo_t *hash_info, char *line_buf, MAYBE_UNUSED const int line_size)
{
  const u32 *digest = (const u32 *) digest_buf;

  const netntlm_t *netntlm = (const netntlm_t *) esalt_buf;

  // we can not change anything in the original buffer, otherwise destroying sorting
  // therefore create some local buffer

  u32 tmp[4];

  tmp[0] = digest[0];
  tmp[1] = digest[1];
  tmp[2] = digest[2];
  tmp[3] = digest[3];

  u8 *out_buf = (u8 *) line_buf;

  int out_len = 0;

  u8 *ptr;

  ptr = (u8 *) netntlm->userdomain_buf;

  for (int i = 0; i < netntlm->user_len; i += 2)
  {
    out_buf[out_len++] = ptr[i];
  }

  out_buf[out_len++] = ':';
  out_buf[out_len++] = ':';

  ptr += netntlm->user_len;

  for (int i = 0; i < netntlm->domain_len; i += 2)
  {
    out_buf[out_len++] = ptr[i];
  }

  out_buf[out_len++] = ':';

  ptr = (u8 *) netntlm->chall_buf;

  for (int i = 0; i < netntlm->srvchall_len; i++)
  {
    u8_to_hex (ptr[i], out_buf + out_len); out_len += 2;
  }

  out_buf[out_len++] = ':';

  u32_to_hex (tmp[0], out_buf + out_len); out_len += 8;
  u32_to_hex (tmp[1], out_buf + out_len); out_len += 8;
  u32_to_hex (tmp[2], out_buf + out_len); out_len += 8;
  u32_to_hex (tmp[3], out_buf + out_len); out_len += 8;

  out_buf[out_len++] = ':';

  ptr += netntlm->srvchall_len;

  for (int i = 0; i < netntlm->clichall_len; i++)
  {
    u8_to_hex (ptr[i], out_buf + out_len); out_len += 2;
  }

  return out_len;
}

void module_init (module_ctx_t *module_ctx)
{
  module_ctx->module_context_size             = MODULE_CONTEXT_SIZE_CURRENT;
  module_ctx->module_interface_version        = MODULE_INTERFACE_VERSION_CURRENT;

  module_ctx->module_attack_exec              = module_attack_exec;
  module_ctx->module_benchmark_esalt          = MODULE_DEFAULT;
  module_ctx->module_benchmark_hook_salt      = MODULE_DEFAULT;
  module_ctx->module_benchmark_mask           = MODULE_DEFAULT;
  module_ctx->module_benchmark_charset        = MODULE_DEFAULT;
  module_ctx->module_benchmark_salt           = MODULE_DEFAULT;
  module_ctx->module_build_plain_postprocess  = MODULE_DEFAULT;
  module_ctx->module_deep_comp_kernel         = MODULE_DEFAULT;
  module_ctx->module_deprecated_notice        = MODULE_DEFAULT;
  module_ctx->module_dgst_pos0                = module_dgst_pos0;
  module_ctx->module_dgst_pos1                = module_dgst_pos1;
  module_ctx->module_dgst_pos2                = module_dgst_pos2;
  module_ctx->module_dgst_pos3                = module_dgst_pos3;
  module_ctx->module_dgst_size                = module_dgst_size;
  module_ctx->module_dictstat_disable         = MODULE_DEFAULT;
  module_ctx->module_esalt_size               = module_esalt_size;
  module_ctx->module_extra_buffer_size        = MODULE_DEFAULT;
  module_ctx->module_extra_tmp_size           = MODULE_DEFAULT;
  module_ctx->module_extra_tuningdb_block     = MODULE_DEFAULT;
  module_ctx->module_forced_outfile_format    = MODULE_DEFAULT;
  module_ctx->module_hash_binary_count        = MODULE_DEFAULT;
  module_ctx->module_hash_binary_parse        = MODULE_DEFAULT;
  module_ctx->module_hash_binary_save         = MODULE_DEFAULT;
  module_ctx->module_hash_decode_postprocess  = MODULE_DEFAULT;
  module_ctx->module_hash_decode_potfile      = MODULE_DEFAULT;
  module_ctx->module_hash_decode_zero_hash    = MODULE_DEFAULT;
  module_ctx->module_hash_decode              = module_hash_decode;
  module_ctx->module_hash_encode_status       = MODULE_DEFAULT;
  module_ctx->module_hash_encode_potfile      = MODULE_DEFAULT;
  module_ctx->module_hash_encode              = module_hash_encode;
  module_ctx->module_hash_init_selftest       = MODULE_DEFAULT;
  module_ctx->module_hash_mode                = MODULE_DEFAULT;
  module_ctx->module_hash_category            = module_hash_category;
  module_ctx->module_hash_name                = module_hash_name;
  module_ctx->module_hashes_count_min         = MODULE_DEFAULT;
  module_ctx->module_hashes_count_max         = MODULE_DEFAULT;
  module_ctx->module_hlfmt_disable            = MODULE_DEFAULT;
  module_ctx->module_hook_extra_param_size    = MODULE_DEFAULT;
  module_ctx->module_hook_extra_param_init    = MODULE_DEFAULT;
  module_ctx->module_hook_extra_param_term    = MODULE_DEFAULT;
  module_ctx->module_hook12                   = MODULE_DEFAULT;
  module_ctx->module_hook23                   = MODULE_DEFAULT;
  module_ctx->module_hook_salt_size           = MODULE_DEFAULT;
  module_ctx->module_hook_size                = MODULE_DEFAULT;
  module_ctx->module_jit_build_options        = MODULE_DEFAULT;
  module_ctx->module_jit_cache_disable        = MODULE_DEFAULT;
  module_ctx->module_kernel_accel_max         = MODULE_DEFAULT;
  module_ctx->module_kernel_accel_min         = MODULE_DEFAULT;
  module_ctx->module_kernel_loops_max         = MODULE_DEFAULT;
  module_ctx->module_kernel_loops_min         = MODULE_DEFAULT;
  module_ctx->module_kernel_threads_max       = MODULE_DEFAULT;
  module_ctx->module_kernel_threads_min       = MODULE_DEFAULT;
  module_ctx->module_kern_type                = module_kern_type;
  module_ctx->module_kern_type_dynamic        = MODULE_DEFAULT;
  module_ctx->module_opti_type                = module_opti_type;
  module_ctx->module_opts_type                = module_opts_type;
  module_ctx->module_outfile_check_disable    = MODULE_DEFAULT;
  module_ctx->module_outfile_check_nocomp     = MODULE_DEFAULT;
  module_ctx->module_potfile_custom_check     = MODULE_DEFAULT;
  module_ctx->module_potfile_disable          = MODULE_DEFAULT;
  module_ctx->module_potfile_keep_all_hashes  = MODULE_DEFAULT;
  module_ctx->module_pwdump_column            = MODULE_DEFAULT;
  module_ctx->module_pw_max                   = MODULE_DEFAULT;
  module_ctx->module_pw_min                   = MODULE_DEFAULT;
  module_ctx->module_salt_max                 = MODULE_DEFAULT;
  module_ctx->module_salt_min                 = MODULE_DEFAULT;
  module_ctx->module_salt_type                = module_salt_type;
  module_ctx->module_separator                = MODULE_DEFAULT;
  module_ctx->module_st_hash                  = module_st_hash;
  module_ctx->module_st_pass                  = module_st_pass;
  module_ctx->module_tmp_size                 = MODULE_DEFAULT;
  module_ctx->module_unstable_warning         = MODULE_DEFAULT;
  module_ctx->module_warmup_disable           = MODULE_DEFAULT;
}