git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfguard.c

   1 //-----------------------------------------------------------------------------
   2 //
   3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   4 // at your option, any later version. See the LICENSE.txt file for the text of
   5 // the license.
   6 //-----------------------------------------------------------------------------
   7 // Low frequency Farpoint / Pyramid tag commands
   8 //-----------------------------------------------------------------------------
   9
  10 #include "cmdlfguard.h"
  11 static int CmdHelp(const char *Cmd);
  12
  13 int usage_lf_guard_clone(void){
  14         PrintAndLog("clone a Guardall tag to a T55x7 tag.");
  15         PrintAndLog("The facility-code is 8-bit and the card number is 16-bit.  Larger values are truncated. ");
  16         PrintAndLog("Currently work only on 26bit");
  17         PrintAndLog("");
  18         PrintAndLog("Usage: lf guard clone <Facility-Code> <Card-Number>");
  19         PrintAndLog("Options :");
  20         PrintAndLog("  <Facility-Code> :  8-bit value facility code");
  21         PrintAndLog("  <Card Number>   : 16-bit value card number");
  22         PrintAndLog("");
  23         PrintAndLog("Sample  : lf guard clone 123 11223");
  24         return 0;
  25 }
  26
  27 int usage_lf_guard_sim(void) {
  28         PrintAndLog("Enables simulation of Guardall card with specified card number.");
  29         PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
  30         PrintAndLog("The facility-code is 8-bit and the card number is 16-bit.  Larger values are truncated.");
  31         PrintAndLog("Currently work only on 26bit");
  32         PrintAndLog("");
  33         PrintAndLog("Usage:  lf guard sim <Card-Number>");
  34         PrintAndLog("Options :");
  35         PrintAndLog("  <Facility-Code> :  8-bit value facility code");
  36         PrintAndLog("  <Card Number>   : 16-bit value card number");
  37         PrintAndLog("");
  38         PrintAndLog("Sample  : lf guard sim 123 11223");
  39         return 0;
  40 }
  41
  42 // Works for 26bits.
  43 int GetGuardBits(uint32_t fc, uint32_t cn, uint8_t *guardBits) {
  44
  45         // Intializes random number generator
  46         time_t t;
  47         srand((unsigned) time(&t));
  48         //uint8_t xorKey = rand() % 0xFF;
  49         uint8_t xorKey = 0x66;
  50         uint8_t i;
  51         uint8_t pre[96];
  52         memset(pre, 0x00, sizeof(pre));
  53
  54         // Get 26 wiegand from FacilityCode, CardNumber
  55         uint8_t wiegand[24];
  56         memset(wiegand, 0x00, sizeof(wiegand));
  57         num_to_bytebits(fc, 8, wiegand);
  58         num_to_bytebits(cn, 16, wiegand+8);
  59
  60         // add wiegand parity bits (dest, source, len)
  61         wiegand_add_parity(pre, wiegand, 24);
  62
  63         // lets start. 12bytes of data to be produced.
  64         uint8_t rawbytes[12];
  65         memset(rawbytes, 0x00, sizeof(rawbytes));
  66
  67         // xor key
  68         rawbytes[0] = xorKey;
  69
  70         // add format length (decimal)
  71         // len | hex | bin
  72         //  26 | 1A  | 0001 1010
  73         rawbytes[1] = (26 << 2);
  74         //  36 | 24  | 0010 0100
  75         //rawbytes[1] = (36 << 2);
  76         //  40 | 28  | 0010 1000
  77         //rawbytes[1] = (40 << 2);
  78
  79         // 2bit checksum, unknown today,
  80         // these two bits are the last ones of rawbyte[1], hence the LSHIFT above.
  81         rawbytes[2] = 1;
  82         rawbytes[3] = 0;
  83
  84         // add wiegand to rawbytes
  85         for (i = 0; i < 4; ++i)
  86                 rawbytes[i+4] = bytebits_to_byte( pre + (i*8), 8);
  87
  88         if (g_debugMode) printf(" WIE | %s\n", sprint_hex(rawbytes, sizeof(rawbytes)));
  89
  90         // XOR (only works on wiegand stuff)
  91         for (i = 1; i < 12; ++i)
  92                 rawbytes[i] ^= xorKey ;
  93
  94         if (g_debugMode) printf(" XOR | %s \n", sprint_hex(rawbytes, sizeof(rawbytes)));
  95
  96         // convert rawbytes to bits in pre
  97         for (i = 0; i < 12; ++i)
  98                 num_to_bytebitsLSBF( rawbytes[i], 8, pre + (i*8));
  99
 100         if (g_debugMode) printf("\n Raw | %s \n", sprint_hex(rawbytes, sizeof(rawbytes)));
 101         if (g_debugMode) printf(" Raw | %s\n", sprint_bin(pre, 64) );
 102
 103         // add spacer bit 0 every 4 bits, starting with index 0,
 104         // 12 bytes, 24 nibbles.  24+1 extra bites. 3bytes.  ie 9bytes | 1byte xorkey, 8bytes rawdata (64bits, should be enough for a 40bit wiegand)
 105         addParity(pre, guardBits+6, 64, 5, 3);
 106
 107         // preamble
 108         guardBits[0] = 1;
 109         guardBits[1] = 1;
 110         guardBits[2] = 1;
 111         guardBits[3] = 1;
 112         guardBits[4] = 1;
 113         guardBits[5] = 0;
 114
 115         if (g_debugMode) printf(" FIN | %s\n", sprint_bin(guardBits, 96) );
 116         return 1;
 117 }
 118
 119 int CmdGuardRead(const char *Cmd) {
 120         CmdLFRead("s");
 121         getSamples("12000", TRUE);
 122         return CmdG_Prox_II_Demod("");
 123 }
 124
 125 int CmdGuardClone(const char *Cmd) {
 126
 127         char cmdp = param_getchar(Cmd, 0);
 128         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_guard_clone();
 129
 130         uint32_t facilitycode=0, cardnumber=0, fc = 0, cn = 0;
 131         uint8_t i;
 132         uint8_t bs[96];
 133         memset(bs, 0x00, sizeof(bs));
 134
 135         //GuardProxII - compat mode, ASK/Biphase,  data rate 64, 3 data blocks
 136         uint32_t blocks[5] = {T55x7_MODULATION_BIPHASE | T55x7_BITRATE_RF_64 | 3<<T55x7_MAXBLOCK_SHIFT, 0, 0, 0, 0};
 137
 138 //      if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
 139         //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
 140 //              blocks[0] = T5555_MODULATION_FSK2 | 50<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT;
 141
 142         if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_guard_clone();
 143
 144         facilitycode = (fc & 0x000000FF);
 145         cardnumber = (cn & 0x0000FFFF);
 146
 147         if ( !GetGuardBits(facilitycode, cardnumber, bs)) {
 148                 PrintAndLog("Error with tag bitstream generation.");
 149                 return 1;
 150         }
 151
 152         blocks[1] = bytebits_to_byte(bs,32);
 153         blocks[2] = bytebits_to_byte(bs+32,32);
 154         blocks[3] = bytebits_to_byte(bs+64,32);
 155
 156         PrintAndLog("Preparing to clone Guardall to T55x7 with Facility Code: %u, Card Number: %u", facilitycode, cardnumber);
 157         PrintAndLog("Blk | Data ");
 158         PrintAndLog("----+------------");
 159         for ( i = 0; i<4; ++i )
 160                 PrintAndLog(" %02d | 0x%08x", i, blocks[i]);
 161
 162         UsbCommand resp;
 163         UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
 164
 165         for ( i = 0; i<4; ++i ) {
 166                 c.arg[0] = blocks[i];
 167                 c.arg[1] = i;
 168                 clearCommandBuffer();
 169                 SendCommand(&c);
 170                 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
 171                         PrintAndLog("Error occurred, device did not respond during write operation.");
 172                         return -1;
 173                 }
 174         }
 175     return 0;
 176 }
 177
 178 int CmdGuardSim(const char *Cmd) {
 179
 180         char cmdp = param_getchar(Cmd, 0);
 181         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_guard_sim();
 182
 183         uint32_t facilitycode = 0, cardnumber = 0, fc = 0, cn = 0;
 184         uint8_t clock = 64, encoding = 2, separator = 0, invert = 0;
 185
 186         uint8_t bs[96];
 187         memset(bs, 0x00, sizeof(bs));
 188
 189         if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_guard_sim();
 190
 191         facilitycode = (fc & 0x000000FF);
 192         cardnumber = (cn & 0x0000FFFF);
 193
 194         if ( !GetGuardBits(facilitycode, cardnumber, bs)) {
 195                 PrintAndLog("Error with tag bitstream generation.");
 196                 return 1;
 197         }
 198
 199         PrintAndLog("Simulating Guardall - Facility Code: %u, CardNumber: %u", facilitycode, cardnumber );
 200
 201         // Guard uses:  clk: 64, invert: 0, encoding: 2 (ASK Biphase)
 202         uint64_t arg1, arg2;
 203         arg1 = (clock << 8) | encoding;
 204         arg2 = (invert << 8) | separator;
 205
 206         uint8_t rawbytes[12];
 207         size_t size = sizeof(rawbytes);
 208         for (uint8_t i=0; i < size; ++i){
 209                 rawbytes[i] =  bytebits_to_byte( bs + (i*8), 8);
 210         }
 211
 212         UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 213         memcpy(c.d.asBytes, rawbytes, size );
 214         clearCommandBuffer();
 215         SendCommand(&c);
 216         return 0;
 217 }
 218
 219 static command_t CommandTable[] = {
 220     {"help",    CmdHelp,                1, "This help"},
 221         {"read",        CmdGuardRead,  0, "Attempt to read and extract tag data"},
 222         {"clone",       CmdGuardClone, 0, "<Facility-Code> <Card Number>  clone Guardall tag"},
 223         {"sim",         CmdGuardSim,   0, "<Facility-Code> <Card Number>  simulate Guardall tag"},
 224     {NULL, NULL, 0, NULL}
 225 };
 226
 227 int CmdLFGuard(const char *Cmd) {
 228         clearCommandBuffer();
 229     CmdsParse(CommandTable, Cmd);
 230     return 0;
 231 }
 232
 233 int CmdHelp(const char *Cmd) {
 234     CmdsHelp(CommandTable);
 235     return 0;
 236 }