Update nfc-mfclassic.c

Adding support for extended Magic cards:
 - DirectWrite cards
 - One Time Write cards

Direct Write cards support modification of B0 directly, without any unlock codes. When we are attempting to detect if a card is 'magic', we will attempt to modify B0 directly as an initial check.

One Time Write cards support modification of B0 directly, one time only. They do not respond to magic commands, but have a fixed UID coming out of the factory. We now detect this UID, and if so, deem the card 'magic'.

utils/nfc-mfclassic.c

@@ -10,6 +10,7 @@
  * See AUTHORS file for a more comprehensive list of contributors.
  * Additional contributors of this file:
  * Copyright (C) 2011-2013 Adam Laurie
+ * Copyright (C) 2018-2019 Danielle Bruneo 
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -70,7 +71,9 @@ static bool bForceKeyFile;
 static bool bTolerateFailures;
 static bool bFormatCard;
 static bool magic2 = false;
+static bool magic3 = false;
 static bool unlocked = false;
+static bool bForceSizeMismatch;
 static uint8_t uiBlocks;
 static uint8_t keys[] = {
   0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
@@ -208,10 +211,18 @@ authenticate(uint32_t uiBlock)
     // Try to authenticate for the current sector
     if (nfc_initiator_mifare_cmd(pnd, mc, uiBlock, &mp))
       return true;
-  }
 
+  } else if (magic3) {
+    //If it's a One Time Write card, we're gonna authenticate with the default keys
+    memcpy(mp.mpa.abtKey, default_key, sizeof(default_key));
+
+
+    // Try to authenticate for the current sector
+    if (nfc_initiator_mifare_cmd(pnd, mc, uiBlock, &mp)) {
+      return true;    
+    }
   // If formatting or not using key file, try to guess the right key
-  if (bFormatCard || !bUseKeyFile) {
+  } else if (bFormatCard || !bUseKeyFile) {
     for (size_t key_index = 0; key_index < num_keys; key_index++) {
       memcpy(mp.mpa.abtKey, keys + (key_index * 6), 6);
       if (nfc_initiator_mifare_cmd(pnd, mc, uiBlock, &mp)) {
@@ -351,12 +362,19 @@ read_card(int read_unlocked)
       if (nfc_initiator_mifare_cmd(pnd, MC_READ, iBlock, &mp)) {
         if (read_unlocked) {
           memcpy(mtDump.amb[iBlock].mbd.abtData, mp.mpd.abtData, sizeof(mtDump.amb[iBlock].mbd.abtData));
+        } else {
+          //If we're using a One Time Write ('Magic 3') Badge - we'll use default keys + ACL
+          if (magic3) {
+            memcpy(mtDump.amb[iBlock].mbt.abtKeyA, default_key, sizeof(default_key));
+            memcpy(mtDump.amb[iBlock].mbt.abtAccessBits, mp.mpt.abtAccessBits, sizeof(mtDump.amb[iBlock].mbt.abtAccessBits));
+            memcpy(mtDump.amb[iBlock].mbt.abtKeyB, default_key, sizeof(default_key));
           } else {
             // Copy the keys over from our key dump and store the retrieved access bits
             memcpy(mtDump.amb[iBlock].mbt.abtKeyA, mtKeys.amb[iBlock].mbt.abtKeyA, sizeof(mtDump.amb[iBlock].mbt.abtKeyA));
             memcpy(mtDump.amb[iBlock].mbt.abtAccessBits, mp.mpt.abtAccessBits, sizeof(mtDump.amb[iBlock].mbt.abtAccessBits));
             memcpy(mtDump.amb[iBlock].mbt.abtKeyB, mtKeys.amb[iBlock].mbt.abtKeyB, sizeof(mtDump.amb[iBlock].mbt.abtKeyB));
           }
+        }
       } else {
         printf("!\nfailed to read trailer block 0x%02x\n", iBlock);
         bFailure = true;
@@ -392,6 +410,7 @@ write_card(int write_block_zero)
   bool bFailure = false;
   uint32_t uiWriteBlocks = 0;
 
+  //Determine if we have to unlock the card
   if (write_block_zero) {
     //If the user is attempting an unlocked write, but has a direct-write type magic card, they don't
     //need to use the W mode. We'll trigger a warning and let them proceed.
@@ -407,8 +426,8 @@ write_card(int write_block_zero)
   }
 
   printf("Writing %d blocks |", uiBlocks + 1);
-  // Write the card from begin to end;
+  // Completely write the card, end to start, but skipping block 0
-  for (uiBlock = 0; uiBlock <= uiBlocks; uiBlock++) {
+  for (uiBlock = 4; uiBlock <= uiBlocks; uiBlock++) {
     // Authenticate everytime we reach the first sector of a new block
     if (is_first_block(uiBlock)) {
       if (bFailure) {
@@ -423,7 +442,11 @@ write_card(int write_block_zero)
       fflush(stdout);
 
       // Try to authenticate for the current sector
-      if (!write_block_zero && !authenticate(uiBlock) && !bTolerateFailures) {
+      // If we are are writing to a chinese magic card, we've already unlocked
+      // If we're writing to a One Time Write card, we need to authenticate
+      // If we're writing something else, we'll need to authenticate
+      if ((write_block_zero && magic3) || !write_block_zero) {
+        if (!authenticate(uiBlock) && !bTolerateFailures) {
           printf("!\nError: authentication failed for block %02x\n", uiBlock);
           return false;
         }
@@ -452,6 +475,74 @@ write_card(int write_block_zero)
         if (uiBlock == 0 && !write_block_zero && !magic2)
           continue;
 
+        // Make sure a earlier write did not fail
+        if (!bFailure) {
+          // Try to write the data block
+          if (bFormatCard && uiBlock)
+
+            memset(mp.mpd.abtData, 0x00, sizeof(mp.mpd.abtData));
+          else
+            memcpy(mp.mpd.abtData, mtDump.amb[uiBlock].mbd.abtData, sizeof(mp.mpd.abtData));
+          // do not write a block 0 with incorrect BCC - card will be made invalid!
+          if (uiBlock == 0) {
+            if ((mp.mpd.abtData[0] ^ mp.mpd.abtData[1] ^ mp.mpd.abtData[2] ^ mp.mpd.abtData[3] ^ mp.mpd.abtData[4]) != 0x00 && !magic2) {
+              printf("!\nError: incorrect BCC in MFD file!\n");
+              printf("Expecting BCC=%02X\n", mp.mpd.abtData[0] ^ mp.mpd.abtData[1] ^ mp.mpd.abtData[2] ^ mp.mpd.abtData[3]);
+              return false;
+            }
+          }
+          if (!nfc_initiator_mifare_cmd(pnd, MC_WRITE, uiBlock, &mp)) {
+            bFailure = true;
+            printf("Failure to write to data block %i\n", uiBlock);
+          }
+          
+        } else {
+          printf("Failure during write process.\n");
+        }
+      }
+    }
+    // Show if the write went well for each block
+    print_success_or_failure(bFailure, &uiWriteBlocks);
+    if ((! bTolerateFailures) && bFailure)
+      return false;
+  }
+
+  //Write Block 0 if necessary
+  if (write_block_zero || magic2 || magic3) {
+    for (uiBlock = 0; uiBlock < 4; uiBlock++) {
+
+        // The first block 0x00 is read only, skip this
+      if (uiBlock == 0) {
+          //If the card is not magic, we're gonna skip over
+        if (write_block_zero || magic2 || magic3) {
+            //NOP
+        } else {
+          continue;
+        }
+      } 
+
+      if (is_first_block(uiBlock)) {
+        if (bFailure) {
+            // When a failure occured we need to redo the anti-collision
+          if (nfc_initiator_select_passive_target(pnd, nmMifare, NULL, 0, &nt) <= 0) {
+            printf("!\nError: tag was removed\n");
+            return false;
+          }
+          bFailure = false;
+        }
+
+        fflush(stdout);    
+          // Try to authenticate for the current sector
+          // If we are are writing to a chinese magic card, we've already unlocked
+          // If we're writing to a One Time Write, we need to authenticate
+          // If we're writing something else, we'll need to authenticate
+        if ((write_block_zero && magic3) || !write_block_zero) {
+          if (!authenticate(uiBlock) && !bTolerateFailures) {
+            printf("!\nError: authentication failed for block %02x\n", uiBlock);
+            return false;
+          } 
+        } 
+      }
 
           // Make sure a earlier write did not fail
       if (!bFailure) {
@@ -468,15 +559,24 @@ write_card(int write_block_zero)
             return false;
           }
         }
-        if (!nfc_initiator_mifare_cmd(pnd, MC_WRITE, uiBlock, &mp))
+        if (!nfc_initiator_mifare_cmd(pnd, MC_WRITE, uiBlock, &mp)) {
           bFailure = true;
+          printf("Failure to write to data block %i\n", uiBlock);
         }
+        
+      } else {
+        printf("Failure during write process.\n");
       }
+
           // Show if the write went well for each block
       print_success_or_failure(bFailure, &uiWriteBlocks);
-    if ((!bTolerateFailures) && bFailure)
+      if ((! bTolerateFailures) && bFailure)
         return false;    
+
     }
+
+  }
+
   printf("|\n");
   printf("Done, %d of %d blocks written.\n", uiWriteBlocks, uiBlocks + 1);
   fflush(stdout);
@@ -505,6 +605,7 @@ print_usage(const char *pcProgramName)
   printf("  <dump.mfd>    - MiFare Dump (MFD) used to write (card to MFD) or (MFD to card)\n");
   printf("  <keys.mfd>    - MiFare Dump (MFD) that contain the keys (optional)\n");
   printf("  f             - Force using the keyfile even if UID does not match (optional)\n");
+
   printf("Examples: \n\n");
   printf("  Read card to file, using key A:\n\n");
   printf("    %s r a u mycard.mfd\n\n", pcProgramName);
@@ -519,6 +620,54 @@ print_usage(const char *pcProgramName)
   printf("    %s r a U01ab23cd mycard.mfd\n\n", pcProgramName);
 }
 
+
+bool is_directwrite(){
+  printf("Checking if Badge is DirectWrite...\n");
+
+  // Set default keys
+  memcpy(mtDump.amb[0].mbt.abtKeyA, default_key, sizeof(default_key));
+  memcpy(mtDump.amb[0].mbt.abtAccessBits, default_acl, sizeof(mp.mpt.abtAccessBits));
+  memcpy(mtDump.amb[0].mbt.abtKeyB, default_key, sizeof(default_key));
+
+  // Temporarly override bUseKeyFile
+  bool orig_bUseKeyFile=bUseKeyFile;
+  bUseKeyFile=false;
+  // Try to authenticate for the current sector
+  if (!authenticate(0)) {
+    printf("!\nError: authentication failed for block 0x%02x\n", 0);
+    bUseKeyFile=orig_bUseKeyFile;
+    return false;
+  }
+  // restore bUseKeyFile
+  bUseKeyFile=orig_bUseKeyFile;
+
+  // Try to read block 0
+  uint8_t original_b0[16];
+  if (nfc_initiator_mifare_cmd(pnd, MC_READ, 0, &mp)) {
+    memcpy(original_b0, mp.mpd.abtData, sizeof(mp.mpd.abtData));
+    printf(" Original Block 0: ");
+    for(int i=0;i<16;i++){
+      printf("%02x", original_b0[i]);
+    }
+    printf("\n");
+    printf(" Original UID: %02x%02x%02x%02x\n",
+       original_b0[0], original_b0[1], original_b0[2], original_b0[3]);
+  } else {
+    printf("!\nError: unable to read block 0x%02x\n", 0);
+    return false;
+  }
+
+  printf(" Attempt to write Block 0 ...\n");
+  memcpy(mp.mpd.abtData, original_b0, sizeof(original_b0));
+  if (!nfc_initiator_mifare_cmd(pnd, MC_WRITE, 0, &mp)) {
+    printf("Failure to write to data block %i\n", 0);
+    return false;
+  }
+  printf(" Block 0 written successfully\n");
+
+  return true;
+}
+
 int
 main(int argc, const char *argv[])
 {
@@ -697,6 +846,26 @@ main(int argc, const char *argv[])
   }
   printf("Guessing size: seems to be a %lu-byte card\n", (uiBlocks + 1) * sizeof(mifare_classic_block));
 
+  //If size is 4k check for direct-write card
+  if (uiBlocks == 0xff) {
+    if (is_directwrite()){
+        printf("Card is DirectWrite\n");
+        magic3=true;
+        unlock=0;
+      } else {
+        printf("Card is not DirectWrite\n");
+      }
+  }
+
+  //Check to see if we have a One Time Write badge (magic3)
+  if (pbtUID[0] == 0xaa && pbtUID[1] == 0x55 &&
+    pbtUID[2] == 0xc3 && pbtUID[3] == 0x96) {
+    printf("Card appears to be a One Time Write Card..\n");
+    magic3 = true;
+    unlock = 0;
+  }
+
+
   if (bUseKeyFile) {
     FILE *pfKeys = fopen(argv[5], "rb");
     if (pfKeys == NULL) {