Added iClass eavesdrop support for Proxmark3

client/cmdhficlass.c

@@ -0,0 +1,191 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>, Hagen Fritsch
+// Copyright (C) 2011 Gerhard de Koning Gans
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// High frequency iClass commands
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "iso14443crc.h" // Can also be used for iClass, using 0xE012 as CRC-type
+#include "data.h"
+#include "proxusb.h"
+#include "ui.h"
+#include "cmdparser.h"
+#include "cmdhficlass.h"
+#include "common.h"
+
+static int CmdHelp(const char *Cmd);
+
+int CmdHFiClassList(const char *Cmd)
+{
+  uint8_t got[1920];
+  GetFromBigBuf(got, sizeof(got));
+
+  PrintAndLog("recorded activity:");
+  PrintAndLog(" ETU     :rssi: who bytes");
+  PrintAndLog("---------+----+----+-----------");
+
+  int i = 0;
+  int prev = -1;
+
+  for (;;) {
+    if(i >= 1900) {
+      break;
+    }
+
+    bool isResponse;
+    int timestamp = *((uint32_t *)(got+i));
+    if (timestamp & 0x80000000) {
+      timestamp &= 0x7fffffff;
+      isResponse = 1;
+    } else {
+      isResponse = 0;
+    }
+
+    int metric = 0;
+    int parityBits = *((uint32_t *)(got+i+4));
+    // 4 bytes of additional information...
+    // maximum of 32 additional parity bit information
+    //
+    // TODO:
+    // at each quarter bit period we can send power level (16 levels)
+    // or each half bit period in 256 levels.
+
+
+    int len = got[i+8];
+
+    if (len > 100) {
+      break;
+    }
+    if (i + len >= 1900) {
+      break;
+    }
+
+    uint8_t *frame = (got+i+9);
+
+    // Break and stick with current result if buffer was not completely full
+    if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
+
+    char line[1000] = "";
+    int j;
+    for (j = 0; j < len; j++) {
+      int oddparity = 0x01;
+      int k;
+
+      for (k=0;k<8;k++) {
+        oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
+      }
+
+      //if((parityBits >> (len - j - 1)) & 0x01) {
+      if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
+        sprintf(line+(j*4), "%02x!  ", frame[j]);
+      }
+      else {
+        sprintf(line+(j*4), "%02x   ", frame[j]);
+      }
+    }
+
+    char *crc;
+    crc = "";
+    if (len > 2) {
+      uint8_t b1, b2;
+      for (j = 0; j < (len - 1); j++) {
+        // gives problems... search for the reason..
+        /*if(frame[j] == 0xAA) {
+          switch(frame[j+1]) {
+            case 0x01:
+              crc = "[1] Two drops close after each other";
+            break;
+            case 0x02:
+              crc = "[2] Potential SOC with a drop in second half of bitperiod";
+              break;
+            case 0x03:
+              crc = "[3] Segment Z after segment X is not possible";
+              break;
+            case 0x04:
+              crc = "[4] Parity bit of a fully received byte was wrong";
+              break;
+            default:
+              crc = "[?] Unknown error";
+              break;
+          }
+          break;
+        }*/
+      }
+
+      if (strlen(crc)==0) {
+	if(!isResponse && len == 4) {
+		// Rough guess that this is a command from the reader
+		// For iClass the command byte is not part of the CRC
+	        ComputeCrc14443(CRC_ICLASS, &frame[1], len-3, &b1, &b2);
+	}
+	else {
+		// For other data.. CRC might not be applicable (UPDATE commands etc.)
+	        ComputeCrc14443(CRC_ICLASS, frame, len-2, &b1, &b2);
+	}
+	//printf("%1x %1x",(unsigned)b1,(unsigned)b2);
+        if (b1 != frame[len-2] || b2 != frame[len-1]) {
+          crc = (isResponse & (len < 8)) ? "" : " !crc";
+        } else {
+          crc = "";
+        }
+      }
+    } else {
+      crc = ""; // SHORT
+    }
+
+    char metricString[100];
+    if (isResponse) {
+      sprintf(metricString, "%3d", metric);
+    } else {
+      strcpy(metricString, "   ");
+    }
+
+    PrintAndLog(" +%7d: %s: %s %s %s",
+      (prev < 0 ? 0 : (timestamp - prev)),
+      metricString,
+      (isResponse ? "TAG" : "   "), line, crc);
+
+    prev = timestamp;
+    i += (len + 9);
+  }
+  return 0;
+}
+
+/*void iso14a_set_timeout(uint32_t timeout) {
+	UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_SET_TIMEOUT, 0, timeout}};
+	SendCommand(&c);
+}*/
+
+int CmdHFiClassSnoop(const char *Cmd)
+{
+  UsbCommand c = {CMD_SNOOP_ICLASS};
+  SendCommand(&c);
+  return 0;
+}
+
+static command_t CommandTable[] = 
+{
+  {"help",    CmdHelp,        1, "This help"},
+  {"list",    CmdHFiClassList,   0, "List iClass history"},
+  {"snoop",   CmdHFiClassSnoop,  0, "Eavesdrop iClass communication"},
+  {NULL, NULL, 0, NULL}
+};
+
+int CmdHFiClass(const char *Cmd)
+{
+  CmdsParse(CommandTable, Cmd);
+  return 0;
+}
+
+int CmdHelp(const char *Cmd)
+{
+  CmdsHelp(CommandTable);
+  return 0;
+}