| 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 "proxusb.h" |
| 14 | #include "proxmark3.h" |
| 15 | #include "data.h" |
| 16 | #include "ui.h" |
| 17 | #include "cmdparser.h" |
| 18 | #include "cmdhflegic.h" |
| 19 | #include "cmdmain.h" |
| 20 | |
| 21 | static int CmdHelp(const char *Cmd); |
| 22 | |
| 23 | static command_t CommandTable[] = |
| 24 | { |
| 25 | {"help", CmdHelp, 1, "This help"}, |
| 26 | {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"}, |
| 27 | {"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"}, |
| 28 | {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"}, |
| 29 | {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"}, |
| 30 | {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"}, |
| 31 | {"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"}, |
| 32 | {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"}, |
| 33 | {NULL, NULL, 0, NULL} |
| 34 | }; |
| 35 | |
| 36 | int CmdHFLegic(const char *Cmd) |
| 37 | { |
| 38 | CmdsParse(CommandTable, Cmd); |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | int CmdHelp(const char *Cmd) |
| 43 | { |
| 44 | CmdsHelp(CommandTable); |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Output BigBuf and deobfuscate LEGIC RF tag data. |
| 50 | * This is based on information given in the talk held |
| 51 | * by Henryk Ploetz and Karsten Nohl at 26c3 |
| 52 | */ |
| 53 | int CmdLegicDecode(const char *Cmd) |
| 54 | { |
| 55 | int i, j, k, n; |
| 56 | int segment_len = 0; |
| 57 | int segment_flag = 0; |
| 58 | int stamp_len = 0; |
| 59 | int crc = 0; |
| 60 | int wrp = 0; |
| 61 | int wrc = 0; |
| 62 | uint8_t data_buf[1024]; // receiver buffer |
| 63 | char out_string[3076]; // just use big buffer - bad practice |
| 64 | char token_type[4]; |
| 65 | |
| 66 | // copy data from proxmark into buffer |
| 67 | GetFromBigBuf(data_buf,sizeof(data_buf),0); |
| 68 | WaitForResponse(CMD_ACK,NULL); |
| 69 | |
| 70 | // Output CDF System area (9 bytes) plus remaining header area (12 bytes) |
| 71 | |
| 72 | PrintAndLog("\nCDF: System Area"); |
| 73 | |
| 74 | PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x", |
| 75 | data_buf[0], |
| 76 | data_buf[1], |
| 77 | data_buf[2], |
| 78 | data_buf[3], |
| 79 | data_buf[4] |
| 80 | ); |
| 81 | |
| 82 | crc = data_buf[4]; |
| 83 | |
| 84 | switch (data_buf[5]&0x7f) { |
| 85 | case 0x00 ... 0x2f: |
| 86 | strncpy(token_type, "IAM",sizeof(token_type)); |
| 87 | break; |
| 88 | case 0x30 ... 0x6f: |
| 89 | strcpy(token_type, "SAM"); |
| 90 | break; |
| 91 | case 0x70 ... 0x7f: |
| 92 | strcpy(token_type, "GAM"); |
| 93 | break; |
| 94 | default: |
| 95 | strcpy(token_type, "???"); |
| 96 | break; |
| 97 | } |
| 98 | |
| 99 | stamp_len = 0xfc - data_buf[6]; |
| 100 | |
| 101 | PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u", |
| 102 | data_buf[5], |
| 103 | data_buf[6], |
| 104 | token_type, |
| 105 | (data_buf[5]&0x80)>>7, |
| 106 | stamp_len |
| 107 | ); |
| 108 | |
| 109 | PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x", |
| 110 | data_buf[7]&0x0f, |
| 111 | (data_buf[7]&0x70)>>4, |
| 112 | (data_buf[7]&0x80)>>7, |
| 113 | data_buf[7], |
| 114 | data_buf[8] |
| 115 | ); |
| 116 | |
| 117 | PrintAndLog("Remaining Header Area"); |
| 118 | |
| 119 | PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x", |
| 120 | data_buf[9], |
| 121 | data_buf[10], |
| 122 | data_buf[11], |
| 123 | data_buf[12], |
| 124 | data_buf[13], |
| 125 | data_buf[14], |
| 126 | data_buf[15], |
| 127 | data_buf[16], |
| 128 | data_buf[17], |
| 129 | data_buf[18], |
| 130 | data_buf[19], |
| 131 | data_buf[20], |
| 132 | data_buf[21] |
| 133 | ); |
| 134 | |
| 135 | PrintAndLog("\nADF: User Area"); |
| 136 | |
| 137 | i = 22; |
| 138 | for (n=0; n<64; n++) { |
| 139 | segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc); |
| 140 | segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4; |
| 141 | |
| 142 | wrp = (data_buf[i+2]^crc); |
| 143 | wrc = ((data_buf[i+3]^crc)&0x70)>>4; |
| 144 | |
| 145 | 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", |
| 146 | n, |
| 147 | data_buf[i]^crc, |
| 148 | data_buf[i+1]^crc, |
| 149 | data_buf[i+2]^crc, |
| 150 | data_buf[i+3]^crc, |
| 151 | segment_flag, |
| 152 | (segment_flag&0x4)>>2, |
| 153 | (segment_flag&0x8)>>3, |
| 154 | segment_len, |
| 155 | wrp, |
| 156 | wrc, |
| 157 | ((data_buf[i+3]^crc)&0x80)>>7, |
| 158 | (data_buf[i+4]^crc) |
| 159 | ); |
| 160 | |
| 161 | i+=5; |
| 162 | |
| 163 | if (wrc>0) { |
| 164 | PrintAndLog("WRC protected area:"); |
| 165 | for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
| 166 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); |
| 167 | out_string[j+2] = ' '; |
| 168 | }; |
| 169 | |
| 170 | out_string[j] = '\0'; |
| 171 | |
| 172 | PrintAndLog("%s", out_string); |
| 173 | } |
| 174 | |
| 175 | if (wrp>wrc) { |
| 176 | PrintAndLog("Remaining write protected area:"); |
| 177 | |
| 178 | for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
| 179 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); |
| 180 | out_string[j+2] = ' '; |
| 181 | }; |
| 182 | |
| 183 | out_string[j] = '\0'; |
| 184 | |
| 185 | PrintAndLog("%s", out_string); |
| 186 | if((wrp-wrc) == 8) { |
| 187 | sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc); |
| 188 | PrintAndLog("%s", out_string); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | PrintAndLog("Remaining segment payload:"); |
| 193 | for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
| 194 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); |
| 195 | out_string[j+2] = ' '; |
| 196 | }; |
| 197 | |
| 198 | out_string[j] = '\0'; |
| 199 | |
| 200 | PrintAndLog("%s", out_string); |
| 201 | |
| 202 | // end with last segment |
| 203 | if (segment_flag & 0x8) |
| 204 | return 0; |
| 205 | }; |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | int CmdLegicRFRead(const char *Cmd) |
| 210 | { |
| 211 | int byte_count=0,offset=0; |
| 212 | sscanf(Cmd, "%i %i", &offset, &byte_count); |
| 213 | if(byte_count == 0) byte_count = -1; |
| 214 | if(byte_count + offset > 1024) byte_count = 1024 - offset; |
| 215 | UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}}; |
| 216 | SendCommand(&c); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | int CmdLegicLoad(const char *Cmd) |
| 221 | { |
| 222 | FILE *f = fopen(Cmd, "r"); |
| 223 | if(!f) { |
| 224 | PrintAndLog("couldn't open '%s'", Cmd); |
| 225 | return -1; |
| 226 | } |
| 227 | char line[80]; int offset = 0; unsigned int data[8]; |
| 228 | while(fgets(line, sizeof(line), f)) { |
| 229 | int res = sscanf(line, "%x %x %x %x %x %x %x %x", |
| 230 | &data[0], &data[1], &data[2], &data[3], |
| 231 | &data[4], &data[5], &data[6], &data[7]); |
| 232 | if(res != 8) { |
| 233 | PrintAndLog("Error: could not read samples"); |
| 234 | fclose(f); |
| 235 | return -1; |
| 236 | } |
| 237 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}}; |
| 238 | int j; for(j = 0; j < 8; j++) { |
| 239 | c.d.asBytes[j] = data[j]; |
| 240 | } |
| 241 | SendCommand(&c); |
| 242 | WaitForResponse(CMD_ACK, NULL); |
| 243 | offset += 8; |
| 244 | } |
| 245 | fclose(f); |
| 246 | PrintAndLog("loaded %u samples", offset); |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | int CmdLegicSave(const char *Cmd) |
| 251 | { |
| 252 | int requested = 1024; |
| 253 | int offset = 0; |
| 254 | int delivered = 0; |
| 255 | char filename[1024]; |
| 256 | uint8_t got[1024]; |
| 257 | |
| 258 | sscanf(Cmd, " %s %i %i", filename, &requested, &offset); |
| 259 | |
| 260 | /* If no length given save entire legic read buffer */ |
| 261 | /* round up to nearest 8 bytes so the saved data can be used with legicload */ |
| 262 | if (requested == 0) { |
| 263 | requested = 1024; |
| 264 | } |
| 265 | if (requested % 8 != 0) { |
| 266 | int remainder = requested % 8; |
| 267 | requested = requested + 8 - remainder; |
| 268 | } |
| 269 | |
| 270 | if (offset + requested > sizeof(got)) { |
| 271 | PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024"); |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | FILE *f = fopen(filename, "w"); |
| 276 | if(!f) { |
| 277 | PrintAndLog("couldn't open '%s'", Cmd+1); |
| 278 | return -1; |
| 279 | } |
| 280 | |
| 281 | GetFromBigBuf(got,requested,offset); |
| 282 | WaitForResponse(CMD_ACK,NULL); |
| 283 | |
| 284 | for (int j = 0; j < requested; j += 8) { |
| 285 | fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n", |
| 286 | got[j+0], |
| 287 | got[j+1], |
| 288 | got[j+2], |
| 289 | got[j+3], |
| 290 | got[j+4], |
| 291 | got[j+5], |
| 292 | got[j+6], |
| 293 | got[j+7] |
| 294 | ); |
| 295 | delivered += 8; |
| 296 | if (delivered >= requested) |
| 297 | break; |
| 298 | } |
| 299 | |
| 300 | fclose(f); |
| 301 | PrintAndLog("saved %u samples", delivered); |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | int CmdLegicRfSim(const char *Cmd) |
| 306 | { |
| 307 | UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF}; |
| 308 | c.arg[0] = 6; |
| 309 | c.arg[1] = 3; |
| 310 | c.arg[2] = 0; |
| 311 | sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]); |
| 312 | SendCommand(&c); |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | int CmdLegicRfWrite(const char *Cmd) |
| 317 | { |
| 318 | UsbCommand c={CMD_WRITER_LEGIC_RF}; |
| 319 | int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]); |
| 320 | if(res != 2) { |
| 321 | PrintAndLog("Please specify the offset and length as two hex strings"); |
| 322 | return -1; |
| 323 | } |
| 324 | SendCommand(&c); |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | int CmdLegicRfFill(const char *Cmd) |
| 329 | { |
| 330 | UsbCommand cmd ={CMD_WRITER_LEGIC_RF}; |
| 331 | int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]); |
| 332 | if(res != 3) { |
| 333 | PrintAndLog("Please specify the offset, length and value as two hex strings"); |
| 334 | return -1; |
| 335 | } |
| 336 | |
| 337 | int i; |
| 338 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}}; |
| 339 | for(i = 0; i < 48; i++) { |
| 340 | c.d.asBytes[i] = cmd.arg[2]; |
| 341 | } |
| 342 | for(i = 0; i < 22; i++) { |
| 343 | c.arg[0] = i*48; |
| 344 | SendCommand(&c); |
| 345 | WaitForResponse(CMD_ACK,NULL); |
| 346 | } |
| 347 | SendCommand(&cmd); |
| 348 | return 0; |
| 349 | } |
| 350 | |