Added support to use 'John the Ripper' hash format with hash-type 18200

OpenCL/m18200_a0-optimized.cl

@@ -25,6 +25,7 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 

OpenCL/m18200_a0-pure.cl

@@ -24,6 +24,7 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 

OpenCL/m18200_a1-optimized.cl

@@ -23,6 +23,7 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 

OpenCL/m18200_a1-pure.cl

@@ -22,6 +22,7 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 

OpenCL/m18200_a3-optimized.cl

@@ -23,6 +23,7 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 

OpenCL/m18200_a3-pure.cl

@@ -22,6 +22,7 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 

docs/changes.txt

@@ -18,6 +18,7 @@
 - Added support to building universal macOS binary on Apple Silicon
 - Added hex encoding format for --separator option
 - Added password candidates range to --status-json output
+- Added support to use 'John the Ripper' hash format with hash-type 18200
 
 ##
 ## Bugs

src/modules/module_18200.c

@@ -47,10 +47,11 @@ typedef struct krb5asrep
   u32 checksum[4];
   u32 edata2[5120];
   u32 edata2_len;
+  u32 format;
 
 } krb5asrep_t;
 
-static const char *SIGNATURE_KRB5ASREP = "$krb5asrep$23$";
+static const char *SIGNATURE_KRB5ASREP = "$krb5asrep$";
 
 char *module_jit_build_options (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra, MAYBE_UNUSED const hashes_t *hashes, MAYBE_UNUSED const hc_device_param_t *device_param)
 {
@@ -122,47 +123,130 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
                 | TOKEN_ATTR_VERIFY_SIGNATURE;
 
   /**
-   * $krb5asrep$23$user_principal_name:checksum$edata2
+   * hc
+   * format 1: $krb5asrep$23$user_principal_name:checksum$edata2
+   *
+   * jtr
+   * format 2: $krb5asrep$user_principal_name:checksum$edata2
    */
 
-  if (line_len < 16) return (PARSER_SALT_LENGTH);
+  if (line_len < (int) strlen (SIGNATURE_KRB5ASREP)) return (PARSER_SALT_LENGTH);
 
-  char *upn_info_start = (char *) line_buf + strlen (SIGNATURE_KRB5ASREP);
+  memset (krb5asrep, 0, sizeof (krb5asrep_t));
-  char *upn_info_stop  = strchr ((const char *) upn_info_start, ':');
 
-  if (upn_info_stop == NULL) return (PARSER_SEPARATOR_UNMATCHED);
+  size_t parse_off = 0;
 
-  upn_info_stop++; // we want the : char included
+  if (line_buf[token.len[0]] == '2' && line_buf[token.len[0] + 1] == '3' && line_buf[token.len[0] + 2] == '$')
+  {
+    // hashcat format
 
-  const int upn_info_len = upn_info_stop - upn_info_start;
+    krb5asrep->format = 1;
+
+    parse_off += 2;
+  }
+  else
+  {
+    // jtr format
+
+    krb5asrep->format = 2;
+  }
+
+  char *account_info_start = (char *) line_buf + strlen (SIGNATURE_KRB5ASREP) + parse_off;
+  char *account_info_stop  = strchr ((const char *) account_info_start, ':');
+
+  if (account_info_stop == NULL) return (PARSER_SEPARATOR_UNMATCHED);
+
+  account_info_stop++; // we want the : char included
+
+  const int account_info_len = account_info_stop - account_info_start;
 
   token.token_cnt  = 4;
 
-  token.len[1]     = upn_info_len;
+  if (krb5asrep->format == 1)
+  {
+    token.token_cnt++;
+
+    // etype
+
+    token.sep[1]     = '$';
+    token.len[1]     = 2;
+    token.attr[1]    = TOKEN_ATTR_FIXED_LENGTH
+                     | TOKEN_ATTR_VERIFY_DIGIT;
+
+    // user_principal_name
+
+    token.sep[2]     = ':';
+    token.len[2]     = account_info_len;
+    token.attr[2]    = TOKEN_ATTR_FIXED_LENGTH;
+
+    // checksum
+
+    token.sep[3]     = '$';
+    token.len_min[3] = 32;
+    token.len_max[3] = 32;
+    token.attr[3]    = TOKEN_ATTR_VERIFY_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
+  {
+    // user_principal_name
+
+    token.sep[1]     = ':';
+    token.len[1]     = account_info_len;
     token.attr[1]    = TOKEN_ATTR_FIXED_LENGTH;
 
+    // checksum
+
     token.sep[2]     = '$';
     token.len_min[2] = 32;
     token.len_max[2] = 32;
     token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH
                      | TOKEN_ATTR_VERIFY_HEX;
 
+    // edata2
+
     token.sep[3]     = '$';
     token.len_min[3] = 64;
     token.len_max[3] = 40960;
     token.attr[3]    = 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 *checksum_pos = token.buf[2];
+  u8 *checksum_pos = NULL;
+  u8 *data_pos = NULL;
 
-  const u8 *data_pos = token.buf[3];
+  int data_len = 0;
-  const int data_len = token.len[3];
+
+  if (krb5asrep->format == 1)
+  {
+    checksum_pos = (u8 *) token.buf[3];
+
+    data_pos = (u8 *) token.buf[4];
+    data_len = token.len[4];
+
+    memcpy (krb5asrep->account_info, token.buf[2], token.len[2]);
+  }
+  else
+  {
+    checksum_pos = (u8 *) token.buf[2];
+
+    data_pos = (u8 *) token.buf[3];
+    data_len = token.len[3];
 
     memcpy (krb5asrep->account_info, token.buf[1], token.len[1]);
+  }
 
   krb5asrep->checksum[0] = hex_to_u32 (checksum_pos +  0);
   krb5asrep->checksum[1] = hex_to_u32 (checksum_pos +  8);
@@ -213,7 +297,11 @@ int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
     sprintf (data + j, "%02x", ptr_edata2[i]);
   }
 
-  const int line_len = snprintf (line_buf, line_size, "%s%s%08x%08x%08x%08x$%s",
+  int line_len = 0;
+
+  if (krb5asrep->format == 1)
+  {
+    line_len = snprintf (line_buf, line_size, "%s23%s%08x%08x%08x%08x$%s",
       SIGNATURE_KRB5ASREP,
       (char *) krb5asrep->account_info,
       byte_swap_32 (krb5asrep->checksum[0]),
@@ -221,6 +309,18 @@ int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
       byte_swap_32 (krb5asrep->checksum[2]),
       byte_swap_32 (krb5asrep->checksum[3]),
       data);
+  }
+  else
+  {
+    line_len = snprintf (line_buf, line_size, "%s%s%08x%08x%08x%08x$%s",
+      SIGNATURE_KRB5ASREP,
+      (char *) krb5asrep->account_info,
+      byte_swap_32 (krb5asrep->checksum[0]),
+      byte_swap_32 (krb5asrep->checksum[1]),
+      byte_swap_32 (krb5asrep->checksum[2]),
+      byte_swap_32 (krb5asrep->checksum[3]),
+      data);
+  }
 
   return line_len;
 }