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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // High frequency Legic commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include "proxmark3.h"
  14 #include "data.h"
  15 #include "ui.h"
  16 #include "cmdparser.h"
  17 #include "cmdhflegic.h"
  18 #include "cmdmain.h"
  19 #include "util.h"
  20 static int CmdHelp(const char *Cmd);
  21
  22 /*
  23  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  24  *   This is based on information given in the talk held
  25  *  by Henryk Ploetz and Karsten Nohl at 26c3
  26  */
  27 int CmdLegicDecode(const char *Cmd)
  28 {
  29         int i, j, k, n;
  30         int segment_len = 0;
  31         int segment_flag = 0;
  32         int stamp_len = 0;
  33         int crc = 0;
  34         int wrp = 0;
  35         int wrc = 0;
  36         uint8_t data_buf[3076]; // receiver buffer
  37         char out_string[3076]; // just use big buffer - bad practice
  38         char token_type[4];
  39
  40         // copy data from proxmark into buffer
  41         GetFromBigBuf(data_buf,sizeof(data_buf),0);
  42         WaitForResponse(CMD_ACK,NULL);
  43
  44         // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  45
  46         PrintAndLog("\nCDF: System Area");
  47
  48         PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  49                 data_buf[0],
  50                 data_buf[1],
  51                 data_buf[2],
  52                 data_buf[3],
  53                 data_buf[4]
  54         );
  55
  56         crc = data_buf[4];
  57
  58         switch (data_buf[5]&0x7f) {
  59                 case 0x00 ... 0x2f:
  60                         strncpy(token_type, "IAM",sizeof(token_type));
  61                         break;
  62                 case 0x30 ... 0x6f:
  63                         strcpy(token_type, "SAM");
  64                         break;
  65                 case 0x70 ... 0x7f:
  66                         strcpy(token_type, "GAM");
  67                         break;
  68                 default:
  69                         strcpy(token_type, "???");
  70                         break;
  71         }
  72
  73         stamp_len = 0xfc - data_buf[6];
  74
  75         PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
  76                 data_buf[5],
  77                 data_buf[6],
  78                 token_type,
  79                 (data_buf[5]&0x80)>>7,
  80                 stamp_len
  81         );
  82
  83         PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
  84                 data_buf[7]&0x0f,
  85                 (data_buf[7]&0x70)>>4,
  86                 (data_buf[7]&0x80)>>7,
  87                 data_buf[7],
  88                 data_buf[8]
  89         );
  90
  91         PrintAndLog("Remaining Header Area");
  92         PrintAndLog("%s", sprint_hex(data_buf+9, 13));
  93         PrintAndLog("\nADF: User Area");
  94
  95         i = 22;
  96         for ( n=0; n<64; n++ ) {
  97                 segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
  98                 segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
  99
 100                 wrp = (data_buf[i+2]^crc);
 101                 wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 102
 103                 PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x",
 104                         n,
 105                         data_buf[i]^crc,
 106                         data_buf[i+1]^crc,
 107                         data_buf[i+2]^crc,
 108                         data_buf[i+3]^crc,
 109                         segment_flag,
 110                         (segment_flag&0x4)>>2,
 111                         (segment_flag&0x8)>>3,
 112                         segment_len,
 113                         wrp,
 114                         wrc,
 115                         ((data_buf[i+3]^crc)&0x80)>>7,
 116                         (data_buf[i+4]^crc)
 117                 );
 118
 119                 i+=5;
 120
 121                 if ( wrc>0 ) {
 122                         PrintAndLog("WRC protected area:");
 123                         for ( k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 124                                 sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 125                                 out_string[j+2] = ' ';
 126                         }
 127
 128                         out_string[j] = '\0';
 129
 130                         PrintAndLog("%s", out_string);
 131                 }
 132
 133                 if ( wrp>wrc ) {
 134                         PrintAndLog("Remaining write protected area:");
 135
 136                         for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 137                                 sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 138                                 out_string[j+2] = ' ';
 139                         };
 140
 141                         out_string[j] = '\0';
 142
 143                         PrintAndLog("%s", out_string);
 144                         if( (wrp-wrc) == 8 ) {
 145                                 sprintf(out_string, "Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
 146                                 PrintAndLog("%s", out_string);
 147                         }
 148                 }
 149
 150                 PrintAndLog("Remaining segment payload:");
 151                 for ( k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 152                         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 153                         out_string[j+2] = ' ';
 154                 };
 155
 156                 out_string[j] = '\0';
 157
 158                 PrintAndLog("%s", out_string);
 159
 160                 // end with last segment
 161                 if (segment_flag & 0x8) return 0;
 162
 163         } // end for loop
 164         return 0;
 165 }
 166
 167 int CmdLegicRFRead(const char *Cmd) {
 168         int byte_count=0, offset=0;
 169         sscanf(Cmd, "%i %i", &offset, &byte_count);
 170         if(byte_count == 0) byte_count = -1;
 171         if(byte_count + offset > 1024) byte_count = 1024 - offset;
 172
 173         UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 174         clearCommandBuffer();
 175         SendCommand(&c);
 176         return 0;
 177 }
 178
 179 int CmdLegicLoad(const char *Cmd) {
 180         char filename[FILE_PATH_SIZE] = {0x00};
 181         int len = 0;
 182
 183         char cmdp = param_getchar(Cmd, 0);
 184         if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) {
 185                 PrintAndLog("It loads datasamples from the file `filename` to device memory");
 186                 PrintAndLog("Usage:  hf legic load <file name>");
 187                 PrintAndLog(" sample: hf legic load filename");
 188                 return 0;
 189         }
 190
 191         len = strlen(Cmd);
 192         if (len > FILE_PATH_SIZE) {
 193                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 194                 return 0;
 195         }
 196         memcpy(filename, Cmd, len);
 197
 198     FILE *f = fopen(filename, "r");
 199     if(!f) {
 200         PrintAndLog("couldn't open '%s'", Cmd);
 201         return -1;
 202     }
 203
 204     char line[80];
 205         int offset = 0;
 206         uint32_t data[8] = {0x00};
 207
 208     while ( fgets(line, sizeof(line), f) ) {
 209         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 210             &data[0], &data[1], &data[2], &data[3],
 211             &data[4], &data[5], &data[6], &data[7]);
 212
 213         if(res != 8) {
 214           PrintAndLog("Error: could not read samples");
 215           fclose(f);
 216           return -1;
 217         }
 218
 219         UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 220                 memcpy(c.d.asBytes, data, 8);
 221                 clearCommandBuffer();
 222         SendCommand(&c);
 223         WaitForResponse(CMD_ACK, NULL);
 224         offset += 8;
 225     }
 226     fclose(f);
 227     PrintAndLog("loaded %u samples", offset);
 228     return 0;
 229 }
 230
 231 int CmdLegicSave(const char *Cmd) {
 232         int requested = 1024;
 233         int offset = 0;
 234         int delivered = 0;
 235         char filename[FILE_PATH_SIZE];
 236         uint8_t got[1024] = {0x00};
 237
 238         sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 239
 240         /* If no length given save entire legic read buffer */
 241         /* round up to nearest 8 bytes so the saved data can be used with legicload */
 242         if (requested == 0)
 243                 requested = 1024;
 244
 245         if (requested % 8 != 0) {
 246                 int remainder = requested % 8;
 247                 requested = requested + 8 - remainder;
 248         }
 249
 250         if (offset + requested > sizeof(got)) {
 251                 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 252                 return 0;
 253         }
 254
 255         FILE *f = fopen(filename, "w");
 256         if(!f) {
 257                 PrintAndLog("couldn't open '%s'", Cmd+1);
 258                 return -1;
 259         }
 260
 261         GetFromBigBuf(got,requested,offset);
 262         WaitForResponse(CMD_ACK,NULL);
 263
 264         for (int j = 0; j < requested; j += 8) {
 265                 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 266                         got[j+0],
 267                         got[j+1],
 268                         got[j+2],
 269                         got[j+3],
 270                         got[j+4],
 271                         got[j+5],
 272                         got[j+6],
 273                         got[j+7]
 274                 );
 275                 delivered += 8;
 276                 if (delivered >= requested) break;
 277         }
 278
 279         fclose(f);
 280         PrintAndLog("saved %u samples", delivered);
 281         return 0;
 282 }
 283
 284 int CmdLegicRfSim(const char *Cmd) {
 285         UsbCommand c= {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
 286         sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 287         clearCommandBuffer();
 288         SendCommand(&c);
 289         return 0;
 290 }
 291
 292 int CmdLegicRfWrite(const char *Cmd) {
 293     UsbCommand c = {CMD_WRITER_LEGIC_RF};
 294     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 295         if(res != 2) {
 296                 PrintAndLog("Please specify the offset and length as two hex strings");
 297         return -1;
 298     }
 299         clearCommandBuffer();
 300     SendCommand(&c);
 301     return 0;
 302 }
 303
 304 int CmdLegicRfFill(const char *Cmd) {
 305     UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
 306     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 307     if(res != 3) {
 308         PrintAndLog("Please specify the offset, length and value as two hex strings");
 309         return -1;
 310     }
 311
 312     int i;
 313     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 314     for(i = 0; i < 48; i++) {
 315                 c.d.asBytes[i] = cmd.arg[2];
 316     }
 317
 318         for(i = 0; i < 22; i++) {
 319                 c.arg[0] = i*48;
 320                 SendCommand(&c);
 321                 WaitForResponse(CMD_ACK,NULL);
 322         }
 323         clearCommandBuffer();
 324     SendCommand(&cmd);
 325     return 0;
 326  }
 327
 328 static command_t CommandTable[] =  {
 329         {"help",        CmdHelp,        1, "This help"},
 330         {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
 331         {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
 332         {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
 333         {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
 334         {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
 335         {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
 336         {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
 337         {NULL, NULL, 0, NULL}
 338 };
 339
 340 int CmdHFLegic(const char *Cmd) {
 341         clearCommandBuffer();
 342         CmdsParse(CommandTable, Cmd);
 343         return 0;
 344 }
 345
 346 int CmdHelp(const char *Cmd) {
 347         CmdsHelp(CommandTable);
 348         return 0;
 349 }