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Merge pull request #3729 from MWR-CyberSec/add-aes-asrep-plugins

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Added plugins for AES128 and AES256 AS-REPs
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Jens Steube 2023-05-23 14:25:09 +02:00 committed by GitHub
commit 9433d0b61e
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6 changed files with 3419 additions and 0 deletions
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OpenCL/m33100-pure.cl Executable file
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/**
* 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"
static const u32 ATTACK_EXEC = ATTACK_EXEC_OUTSIDE_KERNEL;
static const u32 DGST_POS0 = 0;
static const u32 DGST_POS1 = 1;
static const u32 DGST_POS2 = 2;
static const u32 DGST_POS3 = 3;
static const u32 DGST_SIZE = DGST_SIZE_4_4;
static const u32 HASH_CATEGORY = HASH_CATEGORY_NETWORK_PROTOCOL;
static const char *HASH_NAME = "Kerberos 5, etype 17, AS-REP";
static const u64 KERN_TYPE = 33100;
static const u32 OPTI_TYPE = OPTI_TYPE_ZERO_BYTE
| OPTI_TYPE_NOT_ITERATED
| OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
static const u64 OPTS_TYPE = OPTS_TYPE_STOCK_MODULE
| OPTS_TYPE_PT_GENERATE_LE;
static const u32 SALT_TYPE = SALT_TYPE_EMBEDDED;
static const char *ST_PASS = "hashcat";
static const char *ST_HASH = "$krb5asrep$17$user$EXAMPLE.COM$a419c4030e555734b06c2629$c09a1421f96eb126c757a4b87830381f142477d9a85b2beb3093dbfd44f38ddb6016a479537fb7b36e046315869fe79187217971ff6a12c1e0a2df3f68045e03814b21f756d8981f781803d65e8572823c88979581d93cf7d768f2efced16f3719b8d1004d9e73d798de255383476bced47d1982f16be77d0feb55a1f44f58bd013fa4caee58ac614caf0f1cf9101ec9623c5b8c2a1491b73f134f074790088fdb360b5ebce0d32a8145ed00a81ddf77188e150b92d8e8ddd0285d27f1514253e5546e6bba864b362bb1e6483b26d08fa4cc268bfbefe0f690039bcc524b774599df3680c1c3431d891bfa99514a877f964e";
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; }
// Struct to store the hash structure - same fields as TGS-REP type 17
typedef struct krb5asrep_17
{
u32 user[128];
u32 domain[128];
u32 account_info[512];
u32 account_info_len;
u32 checksum[3];
u32 edata2[5120];
u32 edata2_len;
u32 format;
} krb5asrep_17_t;
typedef struct krb5asrep_17_tmp
{
u32 ipad[5];
u32 opad[5];
u32 dgst[16];
u32 out[16];
} krb5asrep_17_tmp_t;
static const char *SIGNATURE_KRB5ASREP = "$krb5asrep$17$";
u64 module_tmp_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 tmp_size = (const u64) sizeof (krb5asrep_17_tmp_t);
return tmp_size;
}
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 (krb5asrep_17_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;
krb5asrep_17_t *krb5asrep = (krb5asrep_17_t *) esalt_buf;
hc_token_t token;
memset (&token, 0, sizeof (hc_token_t));
token.signatures_cnt = 1;
token.signatures_buf[0] = SIGNATURE_KRB5ASREP;
token.len[0] = strlen (SIGNATURE_KRB5ASREP);
token.attr[0] = TOKEN_ATTR_FIXED_LENGTH
| TOKEN_ATTR_VERIFY_SIGNATURE;
/**
* Haschat
* format 1: $krb5asrep$18$user$realm$checksum$edata2
*
* JtR
* format 2: $krb5asrep$18$salt$edata2$checksum
*/
if (line_len < (int) strlen (SIGNATURE_KRB5ASREP)) return (PARSER_SALT_LENGTH);
memset (krb5asrep, 0, sizeof (krb5asrep_17_t));
/**
* JtR format has the checksum at the end, so can identify it based on the
* separator ('$') being at a fixed length from the end of the line. Checksum
* is 24 characters in length, so then there should be a '$' at line_len - 25
*/
if (line_buf[line_len - 25] == '$')
{
// JtR format
krb5asrep->format = 2;
}
else
{
// Hashcat format
krb5asrep->format = 1;
}
token.token_cnt = 4;
if (krb5asrep->format == 1)
{
token.token_cnt++;
// user
token.sep[1] = '$';
token.len_min[1] = 1;
token.len_max[1] = 512;
token.attr[1] = TOKEN_ATTR_VERIFY_LENGTH;
// realm
token.sep[2] = '$';
token.len_min[2] = 1;
token.len_max[2] = 512;
token.attr[2] = TOKEN_ATTR_VERIFY_LENGTH;
// checksum
token.sep[3] = '$';
// hmac-sha1 stripped to 12bytes
token.len[3] = 24;
token.attr[3] = TOKEN_ATTR_FIXED_LENGTH
| TOKEN_ATTR_VERIFY_HEX;
// edata2
token.sep[4] = '$';
token.len_min[4] = 64;
token.len_max[4] = 40960;
token.attr[4] = TOKEN_ATTR_VERIFY_LENGTH
| TOKEN_ATTR_VERIFY_HEX;
}
else
{
// salt
token.sep[1] = '$';
token.len_min[1] = 1;
token.len_max[1] = 512;
token.attr[1] = TOKEN_ATTR_VERIFY_LENGTH;
// edata2
token.sep[2] = '$';
token.len_min[2] = 64;
token.len_max[2] = 40960;
token.attr[2] = TOKEN_ATTR_VERIFY_LENGTH
| TOKEN_ATTR_VERIFY_HEX;
// checksum
token.sep[3] = '$';
// hmac-sha1 stripped to 12bytes
token.len[3] = 24;
token.attr[3] = TOKEN_ATTR_FIXED_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;
const u8 *domain_pos;
const u8 *salt_pos;
const u8 *checksum_pos;
const u8 *data_pos;
int user_len;
int domain_len;
int data_len;
int account_info_len;
if (krb5asrep->format == 1)
{
user_pos = token.buf[1];
user_len = token.len[1];
memcpy (krb5asrep->user, user_pos, user_len);
domain_pos = token.buf[2];
domain_len = token.len[2];
memcpy (krb5asrep->domain, domain_pos, domain_len);
checksum_pos = token.buf[3];
data_pos = token.buf[4];
data_len = token.len[4];
account_info_len = token.len[2] + token.len[1];
}
else
{
salt_pos = token.buf[1];
account_info_len = token.len[1];
memcpy (krb5asrep->account_info, salt_pos, account_info_len);
/**
* JtR format only has the final salt/account_info value (combination of
* user and domain), rather than separate "user" and "domain" values. Since
* user and domain won't be used for the JtR format, their values won't
* matter, so set them both to the same value as account_info.
*/
user_pos = token.buf[1];
user_len = token.len[1];
memcpy (krb5asrep->user, user_pos, user_len);
domain_pos = token.buf[1];
domain_len = token.len[1];
memcpy (krb5asrep->domain, domain_pos, domain_len);
data_pos = token.buf[2];
data_len = token.len[2];
checksum_pos = token.buf[3];
}
u8 *account_info_ptr = (u8 *) krb5asrep->account_info;
// Domain must be uppercase
u8 domain[128];
if (krb5asrep->format == 1)
{
memcpy (domain, domain_pos, domain_len);
uppercase (domain, domain_len);
memcpy (account_info_ptr, domain, domain_len);
memcpy (account_info_ptr + domain_len, user_pos, user_len);
}
krb5asrep->account_info_len = account_info_len;
// hmac-sha1 is reduced to 12 bytes
krb5asrep->checksum[0] = byte_swap_32 (hex_to_u32 (checksum_pos + 0));
krb5asrep->checksum[1] = byte_swap_32 (hex_to_u32 (checksum_pos + 8));
krb5asrep->checksum[2] = byte_swap_32 (hex_to_u32 (checksum_pos + 16));
u8 *edata_ptr = (u8 *) krb5asrep->edata2;
for (int i = 0; i < data_len; i += 2)
{
const u8 p0 = data_pos[i + 0];
const u8 p1 = data_pos[i + 1];
*edata_ptr++ = hex_convert (p1) << 0
| hex_convert (p0) << 4;
}
krb5asrep->edata2_len = data_len / 2;
salt->salt_buf[0] = krb5asrep->checksum[0];
salt->salt_buf[1] = krb5asrep->checksum[1];
salt->salt_buf[2] = krb5asrep->checksum[2];
salt->salt_len = 12;
salt->salt_iter = 4096 - 1;
digest[0] = krb5asrep->checksum[0];
digest[1] = krb5asrep->checksum[1];
digest[2] = krb5asrep->checksum[2];
digest[3] = 0;
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 krb5asrep_17_t *krb5asrep = (const krb5asrep_17_t *) esalt_buf;
char data[5120 * 4 * 2] = { 0 };
for (u32 i = 0, j = 0; i < krb5asrep->edata2_len; i += 1, j += 2)
{
u8 *ptr_edata2 = (u8 *) krb5asrep->edata2;
sprintf (data + j, "%02x", ptr_edata2[i]);
}
int line_len = 0;
if (krb5asrep->format == 1)
{
line_len = snprintf (line_buf, line_size, "%s%s$%s$%08x%08x%08x$%s",
SIGNATURE_KRB5ASREP,
(char *) krb5asrep->user,
(char *) krb5asrep->domain,
krb5asrep->checksum[0],
krb5asrep->checksum[1],
krb5asrep->checksum[2],
data);
}
else
{
line_len = snprintf (line_buf, line_size, "%s%s$%s$%08x%08x%08x",
SIGNATURE_KRB5ASREP,
(char *) krb5asrep->account_info,
data,
krb5asrep->checksum[0],
krb5asrep->checksum[1],
krb5asrep->checksum[2]);
}
return line_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_tmp_size;
module_ctx->module_unstable_warning = MODULE_DEFAULT;
module_ctx->module_warmup_disable = MODULE_DEFAULT;
}

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/**
* 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"
static const u32 ATTACK_EXEC = ATTACK_EXEC_OUTSIDE_KERNEL;
static const u32 DGST_POS0 = 0;
static const u32 DGST_POS1 = 1;
static const u32 DGST_POS2 = 2;
static const u32 DGST_POS3 = 3;
static const u32 DGST_SIZE = DGST_SIZE_4_4;
static const u32 HASH_CATEGORY = HASH_CATEGORY_NETWORK_PROTOCOL;
static const char *HASH_NAME = "Kerberos 5, etype 18, AS-REP";
static const u64 KERN_TYPE = 33200;
static const u32 OPTI_TYPE = OPTI_TYPE_ZERO_BYTE
| OPTI_TYPE_NOT_ITERATED
| OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
static const u64 OPTS_TYPE = OPTS_TYPE_STOCK_MODULE
| OPTS_TYPE_PT_GENERATE_LE;
static const u32 SALT_TYPE = SALT_TYPE_EMBEDDED;
static const char *ST_PASS = "hashcat";
static const char *ST_HASH = "$krb5asrep$18$user$EXAMPLE.COM$aa4c494f520b27873a4de8f7$ebc9976a77f62e8ccca02d43d68bafcc66a81fcbb44a336b00ce401982f32975a5f9bcdc752643252185866685b0a30aaf50e449e392a5994e6979f23aba25f7704c90b2efa03b703c3c2f9e3617cc588ed226d0417e7742d45407878fd946d046b4a9732b9a203cb857811714b009c195b7c96b9bccb7e48832b11a4e92ecf24c49e54de8d0d5d5351445b5126db90bb7eebc7861db1e61de1175824b0a45023a6fa06c2a9d3035fdcf863bea922648e3dc28b48e39b1dec0869e7fe4de399cb52dfcf2596599da54a4bb0169c72d9496de2e137a4594e0e8a69082fc558ac9ace65d32eae5e260a65ca3f2f5871aaeee7a3b090b50f39321d120c144421e0abe7d";
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; }
// Struct to store the hash structure - same fields as TGS-REP type 18
typedef struct krb5asrep_18
{
u32 user[128];
u32 domain[128];
u32 account_info[512];
u32 account_info_len;
u32 checksum[3];
u32 edata2[5120];
u32 edata2_len;
u32 format;
} krb5asrep_18_t;
typedef struct krb5asrep_18_tmp
{
u32 ipad[5];
u32 opad[5];
u32 dgst[16];
u32 out[16];
} krb5asrep_18_tmp_t;
static const char *SIGNATURE_KRB5ASREP = "$krb5asrep$18$";
u64 module_tmp_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 tmp_size = (const u64) sizeof (krb5asrep_18_tmp_t);
return tmp_size;
}
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 (krb5asrep_18_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;
krb5asrep_18_t *krb5asrep = (krb5asrep_18_t *) esalt_buf;
hc_token_t token;
memset (&token, 0, sizeof (hc_token_t));
token.signatures_cnt = 1;
token.signatures_buf[0] = SIGNATURE_KRB5ASREP;
token.len[0] = strlen (SIGNATURE_KRB5ASREP);
token.attr[0] = TOKEN_ATTR_FIXED_LENGTH
| TOKEN_ATTR_VERIFY_SIGNATURE;
/**
* Haschat
* format 1: $krb5asrep$18$user$realm$checksum$edata2
*
* JtR
* format 2: $krb5asrep$18$salt$edata2$checksum
*/
if (line_len < (int) strlen (SIGNATURE_KRB5ASREP)) return (PARSER_SALT_LENGTH);
memset (krb5asrep, 0, sizeof (krb5asrep_18_t));
/**
* JtR format has the checksum at the end, so can identify it based on the
* separator ('$') being at a fixed length from the end of the line. Checksum
* is 24 characters in length, so then there should be a '$' at line_len - 25
*/
if (line_buf[line_len - 25] == '$')
{
// JtR format
krb5asrep->format = 2;
}
else
{
// Hashcat format
krb5asrep->format = 1;
}
token.token_cnt = 4;
if (krb5asrep->format == 1)
{
token.token_cnt++;
// user
token.sep[1] = '$';
token.len_min[1] = 1;
token.len_max[1] = 512;
token.attr[1] = TOKEN_ATTR_VERIFY_LENGTH;
// realm
token.sep[2] = '$';
token.len_min[2] = 1;
token.len_max[2] = 512;
token.attr[2] = TOKEN_ATTR_VERIFY_LENGTH;
// checksum
token.sep[3] = '$';
// hmac-sha1 stripped to 12bytes
token.len[3] = 24;
token.attr[3] = TOKEN_ATTR_FIXED_LENGTH
| TOKEN_ATTR_VERIFY_HEX;
// edata2
token.sep[4] = '$';
token.len_min[4] = 64;
token.len_max[4] = 40960;
token.attr[4] = TOKEN_ATTR_VERIFY_LENGTH
| TOKEN_ATTR_VERIFY_HEX;
}
else
{
// salt
token.sep[1] = '$';
token.len_min[1] = 1;
token.len_max[1] = 512;
token.attr[1] = TOKEN_ATTR_VERIFY_LENGTH;
// edata2
token.sep[2] = '$';
token.len_min[2] = 64;
token.len_max[2] = 40960;
token.attr[2] = TOKEN_ATTR_VERIFY_LENGTH
| TOKEN_ATTR_VERIFY_HEX;
// checksum
token.sep[3] = '$';
// hmac-sha1 stripped to 12bytes
token.len[3] = 24;
token.attr[3] = TOKEN_ATTR_FIXED_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;
const u8 *domain_pos;
const u8 *salt_pos;
const u8 *checksum_pos;
const u8 *data_pos;
int user_len;
int domain_len;
int data_len;
int account_info_len;
if (krb5asrep->format == 1)
{
user_pos = token.buf[1];
user_len = token.len[1];
memcpy (krb5asrep->user, user_pos, user_len);
domain_pos = token.buf[2];
domain_len = token.len[2];
memcpy (krb5asrep->domain, domain_pos, domain_len);
checksum_pos = token.buf[3];
data_pos = token.buf[4];
data_len = token.len[4];
account_info_len = token.len[2] + token.len[1];
}
else
{
salt_pos = token.buf[1];
account_info_len = token.len[1];
memcpy (krb5asrep->account_info, salt_pos, account_info_len);
/**
* JtR format only has the final salt/account_info value (combination of
* user and domain), rather than separate "user" and "domain" values. Since
* user and domain won't be used for the JtR format, their values won't
* matter, so set them both to the same value as account_info.
*/
user_pos = token.buf[1];
user_len = token.len[1];
memcpy (krb5asrep->user, user_pos, user_len);
domain_pos = token.buf[1];
domain_len = token.len[1];
memcpy (krb5asrep->domain, domain_pos, domain_len);
data_pos = token.buf[2];
data_len = token.len[2];
checksum_pos = token.buf[3];
}
u8 *account_info_ptr = (u8 *) krb5asrep->account_info;
// Domain must be uppercase
u8 domain[128];
if (krb5asrep->format == 1)
{
memcpy (domain, domain_pos, domain_len);
uppercase (domain, domain_len);
memcpy (account_info_ptr, domain, domain_len);
memcpy (account_info_ptr + domain_len, user_pos, user_len);
}
krb5asrep->account_info_len = account_info_len;
// hmac-sha1 is reduced to 12 bytes
krb5asrep->checksum[0] = byte_swap_32 (hex_to_u32 (checksum_pos + 0));
krb5asrep->checksum[1] = byte_swap_32 (hex_to_u32 (checksum_pos + 8));
krb5asrep->checksum[2] = byte_swap_32 (hex_to_u32 (checksum_pos + 16));
u8 *edata_ptr = (u8 *) krb5asrep->edata2;
for (int i = 0; i < data_len; i += 2)
{
const u8 p0 = data_pos[i + 0];
const u8 p1 = data_pos[i + 1];
*edata_ptr++ = hex_convert (p1) << 0
| hex_convert (p0) << 4;
}
krb5asrep->edata2_len = data_len / 2;
salt->salt_buf[0] = krb5asrep->checksum[0];
salt->salt_buf[1] = krb5asrep->checksum[1];
salt->salt_buf[2] = krb5asrep->checksum[2];
salt->salt_len = 12;
salt->salt_iter = 4096 - 1;
digest[0] = krb5asrep->checksum[0];
digest[1] = krb5asrep->checksum[1];
digest[2] = krb5asrep->checksum[2];
digest[3] = 0;
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 krb5asrep_18_t *krb5asrep = (const krb5asrep_18_t *) esalt_buf;
char data[5120 * 4 * 2] = { 0 };
for (u32 i = 0, j = 0; i < krb5asrep->edata2_len; i += 1, j += 2)
{
u8 *ptr_edata2 = (u8 *) krb5asrep->edata2;
sprintf (data + j, "%02x", ptr_edata2[i]);
}
int line_len = 0;
if (krb5asrep->format == 1)
{
line_len = snprintf (line_buf, line_size, "%s%s$%s$%08x%08x%08x$%s",
SIGNATURE_KRB5ASREP,
(char *) krb5asrep->user,
(char *) krb5asrep->domain,
krb5asrep->checksum[0],
krb5asrep->checksum[1],
krb5asrep->checksum[2],
data);
}
else
{
line_len = snprintf (line_buf, line_size, "%s%s$%s$%08x%08x%08x",
SIGNATURE_KRB5ASREP,
(char *) krb5asrep->account_info,
data,
krb5asrep->checksum[0],
krb5asrep->checksum[1],
krb5asrep->checksum[2]);
}
return line_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_tmp_size;
module_ctx->module_unstable_warning = MODULE_DEFAULT;
module_ctx->module_warmup_disable = MODULE_DEFAULT;
}

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#!/usr/bin/env perl
##
## Author......: See docs/credits.txt
## License.....: MIT
##
use strict;
use warnings;
use Digest::SHA qw (hmac_sha1);
use Crypt::Mode::CBC;
use Crypt::PBKDF2;
sub byte2hex
{
my $input = shift;
return unpack ("H*", $input);
}
sub hex2byte
{
my $input = shift;
return pack ("H*", $input);
}
sub pad
{
my $n = shift;
my $size = shift;
return (~$n + 1) & ($size - 1);
}
sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
sub module_generate_hash
{
my $word = shift;
my $salt = shift;
my $user = shift // "user";
my $realm = shift // "example.com";
my $checksum = shift;
my $edata2 = shift;
my $mysalt = uc $realm;
$mysalt = $mysalt . $user;
# first we generate the 'seed'
my $iter = 4096;
my $pbkdf2 = Crypt::PBKDF2->new
(
hash_class => 'HMACSHA1',
iterations => $iter,
output_len => 16
);
my $b_seed = $pbkdf2->PBKDF2 ($mysalt, $word);
# we can precompute this
my $b_kerberos_nfolded = hex2byte ('6b65726265726f737b9b5b2b93132b93');
my $b_iv = hex2byte ('0' x 32);
# 'key_bytes' will be the AES key used to generate 'ki' (for final hmac-sha1)
# and 'ke' (AES key to decrypt/encrypt the ticket)
my $cbc = Crypt::Mode::CBC->new ('AES', 0);
my $b_key_bytes = $cbc->encrypt ($b_kerberos_nfolded, $b_seed, $b_iv);
# precomputed stuff
my $b_nfolded1 = hex2byte ('6b60b0582a6ba80d5aad56ab55406ad5');
my $b_nfolded2 = hex2byte ('be349a4d24be500eaf57abd5ea80757a');
my $b_ki = $cbc->encrypt ($b_nfolded1, $b_key_bytes, $b_iv);
my $b_ke = $cbc->encrypt ($b_nfolded2, $b_key_bytes, $b_iv);
my $cleartext_ticket = '7981df3081dca01b3019a003020111a1120410e2aa1c894df7'.
'23b7277eef29700bf760a11c301a3018a003020100a111180f32303233303333313132303'.
'434355aa20602041d9d970ba311180f32303337303931343032343830355aa40703050040'.
'c10000a511180f32303233303333313132303434355aa611180f323032333033333131323'.
'03434355aa711180f32303233303333313232303434355aa811180f323032333034303731'.
'32303434355aa90d1b0b4558414d504c452e434f4daa20301ea003020102a11730151b066'.
'b72627467741b0b6578616d706c652e636f6d';
if (defined $edata2)
{
my $len_last_block = length ($edata2) % 32;
my $tmp = $len_last_block + 32;
my $b_truncated_enc_ticket = hex2byte (substr $edata2, 0, -$tmp);
my $b_last_block = hex2byte (substr $edata2, -$len_last_block);
my $b_n_1_block = hex2byte (substr (substr ($edata2, -$tmp), 0, 32));
my $b_truncated_ticket_decrypted = $cbc->decrypt ($b_truncated_enc_ticket, $b_ke, $b_iv);
my $truncated_ticket_decrypted = byte2hex ($b_truncated_ticket_decrypted);
my $check_correct = ((substr ($truncated_ticket_decrypted, 16, 4) eq "7981" || substr ($truncated_ticket_decrypted, 16, 4) eq "7a81") && (substr ($truncated_ticket_decrypted, 22, 2) eq "30")) ||
((substr ($truncated_ticket_decrypted, 16, 2) eq "79" || substr ($truncated_ticket_decrypted, 16, 2) eq "7a") && (substr ($truncated_ticket_decrypted, 20, 2) eq "30")) ||
((substr ($truncated_ticket_decrypted, 16, 4) eq "7982" || substr ($truncated_ticket_decrypted, 16, 4) eq "7a82") && (substr ($truncated_ticket_decrypted, 24, 2) eq "30"));
if ($check_correct == 1)
{
my $b_n_2 = substr $b_truncated_enc_ticket, -16;
my $b_n_1_decrypted = $cbc->decrypt ($b_n_1_block, $b_ke, $b_iv);
my $b_last_plain = substr $b_n_1_decrypted, 0, $len_last_block / 2;
$b_last_plain = $b_last_plain ^ $b_last_block;
my $omitted = substr $b_n_1_decrypted, -(16 - $len_last_block / 2);
my $b_n_1 = $b_last_block . $omitted;
$b_n_1 = $cbc->decrypt ($b_n_1, $b_ke, $b_iv);
$b_n_1 = $b_n_1 ^ $b_n_2;
my $b_cleartext_ticket = $b_truncated_ticket_decrypted . $b_n_1 . $b_last_plain;
$cleartext_ticket = byte2hex ($b_cleartext_ticket);
}
else # validation failed
{
# fake/wrong ticket (otherwise if we just decrypt/encrypt we end
#up with false positives all the time)
$cleartext_ticket = "0" x (length ($cleartext_ticket) + 32);
}
}
if (defined $checksum)
{
$checksum = pack ("H*", $checksum);
}
else
{
if (!defined $edata2)
{
my $nonce = unpack ("H*", random_bytes (16));
$cleartext_ticket = $nonce . $cleartext_ticket;
}
# we have what is required to compute checksum
$checksum = hmac_sha1 (hex2byte ($cleartext_ticket), $b_ki);
$checksum = substr $checksum, 0, 12;
}
my $len_cleartext_last_block = length ($cleartext_ticket) % 32;
my $cleartext_last_block = substr $cleartext_ticket, -$len_cleartext_last_block;
my $padding = pad (length ($cleartext_ticket), 32);
my $b_cleartext_last_block_padded = hex2byte ($cleartext_last_block . '0' x $padding);
# we will encrypt until n-1 block (included)
my $truncated_cleartext_ticket = substr $cleartext_ticket, 0, -$len_cleartext_last_block;
my $b_truncated_enc_ticket = $cbc->encrypt (hex2byte ($truncated_cleartext_ticket), $b_ke, $b_iv);
my $b_enc_ticket_n_1_block= substr $b_truncated_enc_ticket, -16;
my $b_enc_last_block = substr $b_enc_ticket_n_1_block, 0, $len_cleartext_last_block / 2;
# we now craft the new n-1 block
my $tmp = $b_enc_ticket_n_1_block ^ $b_cleartext_last_block_padded;
$b_enc_ticket_n_1_block = $cbc->encrypt ($tmp, $b_ke, $b_iv);
$tmp = substr $b_truncated_enc_ticket, 0, -16;
$edata2 = $tmp . $b_enc_ticket_n_1_block . $b_enc_last_block;
my $tmp_hash = sprintf ('$krb5asrep$17$%s$%s$%s$%s', $user, $realm, unpack ("H*", $checksum), unpack ("H*", $edata2));
return $tmp_hash;
}
sub module_verify_hash
{
my $line = shift;
my ($hash, $word) = split (':', $line);
return unless defined $hash;
return unless defined $word;
my @data = split ('\$', $hash);
return unless scalar @data == 7;
shift @data;
my $signature = shift @data;
my $algorithm = shift @data;
my $user = shift @data;
my $realm = shift @data;
my $checksum = shift @data;
my $edata2 = shift @data;
return unless ($signature eq "krb5asrep");
return unless ($algorithm eq "17");
return unless (length ($checksum) == 24);
return unless (length ($edata2) >= 64);
my $word_packed = pack_if_HEX_notation ($word);
my $new_hash = module_generate_hash ($word_packed, undef, $user, $realm, $checksum, $edata2);
return ($new_hash, $word);
}
1;

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#!/usr/bin/env perl
##
## Author......: See docs/credits.txt
## License.....: MIT
##
use strict;
use warnings;
use Digest::SHA qw (hmac_sha1);
use Crypt::Mode::CBC;
use Crypt::PBKDF2;
sub byte2hex
{
my $input = shift;
return unpack ("H*", $input);
}
sub hex2byte
{
my $input = shift;
return pack ("H*", $input);
}
sub pad
{
my $n = shift;
my $size = shift;
return (~$n + 1) & ($size - 1);
}
sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
sub module_generate_hash
{
my $word = shift;
my $salt = shift;
my $user = shift // "user";
my $realm = shift // "example.com";
my $checksum = shift;
my $edata2 = shift;
my $mysalt = uc $realm;
$mysalt = $mysalt . $user;
# first we generate the 'seed'
my $iter = 4096;
my $pbkdf2 = Crypt::PBKDF2->new
(
hash_class => 'HMACSHA1',
iterations => $iter,
output_len => 32
);
my $b_seed = $pbkdf2->PBKDF2 ($mysalt, $word);
# we can precompute this
my $b_kerberos_nfolded = hex2byte ('6b65726265726f737b9b5b2b93132b93');
my $b_iv = hex2byte ('0' x 32);
# 'key_bytes' will be the AES key used to generate 'ki' (for final hmac-sha1)
# and 'ke' (AES key to decrypt/encrypt the ticket)
my $cbc = Crypt::Mode::CBC->new ('AES', 0);
my $b_key_bytes = $cbc->encrypt ($b_kerberos_nfolded, $b_seed, $b_iv);
$b_key_bytes = $b_key_bytes . $cbc->encrypt ($b_key_bytes, $b_seed, $b_iv);
# precomputed stuff
my $b_nfolded1 = hex2byte ('6b60b0582a6ba80d5aad56ab55406ad5');
my $b_nfolded2 = hex2byte ('be349a4d24be500eaf57abd5ea80757a');
my $b_ki = $cbc->encrypt ($b_nfolded1, $b_key_bytes, $b_iv);
$b_ki = $b_ki . $cbc->encrypt ($b_ki, $b_key_bytes, $b_iv);
my $b_ke = $cbc->encrypt ($b_nfolded2, $b_key_bytes, $b_iv);
$b_ke = $b_ke . $cbc->encrypt ($b_ke, $b_key_bytes, $b_iv);
my $cleartext_ticket = '7981ef3081eca02b3029a003020112a12204200e97d1626616'.
'6e06252cbec52003e0f6b4f0280deec6dc58cdbf39845d6f0e77a11c301a3018a00302010'.
'0a111180f32303233303331363135353732315aa20602045b66ac3ea311180f3230333730'.
'3931343032343830355aa40703050050c10000a511180f323032333033313631353537323'.
'15aa611180f32303233303331363135353732315aa711180f323032333033313730313537'.
'32315aa811180f32303233303331373135353732315aa90d1b0b4558414d504c452e434f4'.
'daa20301ea003020101a11730151b066b72627467741b0b4558414d504c452e434f4d';
if (defined $edata2)
{
my $len_last_block = length ($edata2) % 32;
my $tmp = $len_last_block + 32;
my $b_truncated_enc_ticket = hex2byte (substr $edata2, 0, -$tmp);
my $b_last_block = hex2byte (substr $edata2, -$len_last_block);
my $b_n_1_block = hex2byte (substr (substr ($edata2, -$tmp), 0, 32));
my $b_truncated_ticket_decrypted = $cbc->decrypt ($b_truncated_enc_ticket, $b_ke, $b_iv);
my $truncated_ticket_decrypted = byte2hex ($b_truncated_ticket_decrypted);
my $check_correct = ((substr ($truncated_ticket_decrypted, 16, 4) eq "7981" || substr ($truncated_ticket_decrypted, 16, 4) eq "7a81") && (substr ($truncated_ticket_decrypted, 22, 2) eq "30")) ||
((substr ($truncated_ticket_decrypted, 16, 2) eq "79" || substr ($truncated_ticket_decrypted, 16, 2) eq "7a") && (substr ($truncated_ticket_decrypted, 20, 2) eq "30")) ||
((substr ($truncated_ticket_decrypted, 16, 4) eq "7982" || substr ($truncated_ticket_decrypted, 16, 4) eq "7a82") && (substr ($truncated_ticket_decrypted, 24, 2) eq "30"));
if ($check_correct == 1)
{
my $b_n_2 = substr $b_truncated_enc_ticket, -16;
my $b_n_1_decrypted = $cbc->decrypt ($b_n_1_block, $b_ke, $b_iv);
my $b_last_plain = substr $b_n_1_decrypted, 0, $len_last_block / 2;
$b_last_plain = $b_last_plain ^ $b_last_block;
my $omitted = substr $b_n_1_decrypted, -(16 - $len_last_block / 2);
my $b_n_1 = $b_last_block . $omitted;
$b_n_1 = $cbc->decrypt ($b_n_1, $b_ke, $b_iv);
$b_n_1 = $b_n_1 ^ $b_n_2;
my $b_cleartext_ticket = $b_truncated_ticket_decrypted . $b_n_1 . $b_last_plain;
$cleartext_ticket = byte2hex ($b_cleartext_ticket);
}
else # validation failed
{
# fake/wrong ticket (otherwise if we just decrypt/encrypt we end
#up with false positives all the time)
$cleartext_ticket = "0" x (length ($cleartext_ticket) + 32);
}
}
if (defined $checksum)
{
$checksum = pack ("H*", $checksum);
}
else
{
if (!defined $edata2)
{
my $nonce = unpack ("H*", random_bytes (16));
$cleartext_ticket = $nonce . $cleartext_ticket;
}
# we have what is required to compute checksum
$checksum = hmac_sha1 (hex2byte ($cleartext_ticket), $b_ki);
$checksum = substr $checksum, 0, 12;
}
my $len_cleartext_last_block = length ($cleartext_ticket) % 32;
my $cleartext_last_block = substr $cleartext_ticket, -$len_cleartext_last_block;
my $padding = pad (length ($cleartext_ticket), 32);
my $b_cleartext_last_block_padded = hex2byte ($cleartext_last_block . '0' x $padding);
# we will encrypt until n-1 block (included)
my $truncated_cleartext_ticket = substr $cleartext_ticket, 0, -$len_cleartext_last_block;
my $b_truncated_enc_ticket = $cbc->encrypt (hex2byte ($truncated_cleartext_ticket), $b_ke, $b_iv);
my $b_enc_ticket_n_1_block= substr $b_truncated_enc_ticket, -16;
my $b_enc_last_block = substr $b_enc_ticket_n_1_block, 0, $len_cleartext_last_block / 2;
# we now craft the new n-1 block
my $tmp = $b_enc_ticket_n_1_block ^ $b_cleartext_last_block_padded;
$b_enc_ticket_n_1_block = $cbc->encrypt ($tmp, $b_ke, $b_iv);
$tmp = substr $b_truncated_enc_ticket, 0, -16;
$edata2 = $tmp . $b_enc_ticket_n_1_block . $b_enc_last_block;
my $tmp_hash = sprintf ('$krb5asrep$18$%s$%s$%s$%s', $user, $realm, unpack ("H*", $checksum), unpack ("H*", $edata2));
return $tmp_hash;
}
sub module_verify_hash
{
my $line = shift;
my ($hash, $word) = split (':', $line);
return unless defined $hash;
return unless defined $word;
my @data = split ('\$', $hash);
return unless scalar @data == 7;
shift @data;
my $signature = shift @data;
my $algorithm = shift @data;
my $user = shift @data;
my $realm = shift @data;
my $checksum = shift @data;
my $edata2 = shift @data;
return unless ($signature eq "krb5asrep");
return unless ($algorithm eq "18");
return unless (length ($checksum) == 24);
return unless (length ($edata2) >= 64);
my $word_packed = pack_if_HEX_notation ($word);
my $new_hash = module_generate_hash ($word_packed, undef, $user, $realm, $checksum, $edata2);
return ($new_hash, $word);
}
1;