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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 | // Low frequency EM4x commands | |
9 | //----------------------------------------------------------------------------- | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <string.h> | |
13 | #include <inttypes.h> | |
14 | #include "proxmark3.h" | |
15 | #include "ui.h" | |
16 | #include "util.h" | |
17 | #include "graph.h" | |
18 | #include "cmdparser.h" | |
19 | #include "cmddata.h" | |
20 | #include "cmdlf.h" | |
21 | #include "cmdlfem4x.h" | |
22 | char *global_em410xId; | |
23 | ||
24 | static int CmdHelp(const char *Cmd); | |
25 | ||
26 | int CmdEMdemodASK(const char *Cmd) | |
27 | { | |
28 | char cmdp = param_getchar(Cmd, 0); | |
29 | int findone = (cmdp == '1') ? 1 : 0; | |
30 | UsbCommand c={CMD_EM410X_DEMOD}; | |
31 | c.arg[0]=findone; | |
32 | SendCommand(&c); | |
33 | return 0; | |
34 | } | |
35 | ||
36 | /* Read the ID of an EM410x tag. | |
37 | * Format: | |
38 | * 1111 1111 1 <-- standard non-repeatable header | |
39 | * XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID | |
40 | * .... | |
41 | * CCCC <-- each bit here is parity for the 10 bits above in corresponding column | |
42 | * 0 <-- stop bit, end of tag | |
43 | */ | |
44 | int CmdEM410xRead(const char *Cmd) | |
45 | { | |
46 | uint32_t hi=0; | |
47 | uint64_t lo=0; | |
48 | ||
49 | if(!AskEm410xDemod("", &hi, &lo)) return 0; | |
50 | PrintAndLog("EM410x pattern found: "); | |
51 | printEM410x(hi, lo); | |
52 | if (hi){ | |
53 | PrintAndLog ("EM410x XL pattern found"); | |
54 | return 0; | |
55 | } | |
56 | char id[11] = {0x00}; | |
57 | sprintf(id, "%010x", lo); | |
58 | global_em410xId = id; | |
59 | return 1; | |
60 | } | |
61 | ||
62 | // emulate an EM410X tag | |
63 | int CmdEM410xSim(const char *Cmd) | |
64 | { | |
65 | int i, n, j, binary[4], parity[4]; | |
66 | ||
67 | char cmdp = param_getchar(Cmd, 0); | |
68 | uint8_t uid[5] = {0x00}; | |
69 | ||
70 | if (cmdp == 'h' || cmdp == 'H') { | |
71 | PrintAndLog("Usage: lf em4x 410xsim <UID>"); | |
72 | PrintAndLog(""); | |
73 | PrintAndLog(" sample: lf em4x 410xsim 0F0368568B"); | |
74 | return 0; | |
75 | } | |
76 | ||
77 | if (param_gethex(Cmd, 0, uid, 10)) { | |
78 | PrintAndLog("UID must include 10 HEX symbols"); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X", uid[0],uid[1],uid[2],uid[3],uid[4]); | |
83 | PrintAndLog("Press pm3-button to about simulation"); | |
84 | ||
85 | /* clock is 64 in EM410x tags */ | |
86 | int clock = 64; | |
87 | ||
88 | /* clear our graph */ | |
89 | ClearGraph(0); | |
90 | ||
91 | /* write 9 start bits */ | |
92 | for (i = 0; i < 9; i++) | |
93 | AppendGraph(0, clock, 1); | |
94 | ||
95 | /* for each hex char */ | |
96 | parity[0] = parity[1] = parity[2] = parity[3] = 0; | |
97 | for (i = 0; i < 10; i++) | |
98 | { | |
99 | /* read each hex char */ | |
100 | sscanf(&Cmd[i], "%1x", &n); | |
101 | for (j = 3; j >= 0; j--, n/= 2) | |
102 | binary[j] = n % 2; | |
103 | ||
104 | /* append each bit */ | |
105 | AppendGraph(0, clock, binary[0]); | |
106 | AppendGraph(0, clock, binary[1]); | |
107 | AppendGraph(0, clock, binary[2]); | |
108 | AppendGraph(0, clock, binary[3]); | |
109 | ||
110 | /* append parity bit */ | |
111 | AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]); | |
112 | ||
113 | /* keep track of column parity */ | |
114 | parity[0] ^= binary[0]; | |
115 | parity[1] ^= binary[1]; | |
116 | parity[2] ^= binary[2]; | |
117 | parity[3] ^= binary[3]; | |
118 | } | |
119 | ||
120 | /* parity columns */ | |
121 | AppendGraph(0, clock, parity[0]); | |
122 | AppendGraph(0, clock, parity[1]); | |
123 | AppendGraph(0, clock, parity[2]); | |
124 | AppendGraph(0, clock, parity[3]); | |
125 | ||
126 | /* stop bit */ | |
127 | AppendGraph(1, clock, 0); | |
128 | ||
129 | CmdLFSim("0"); //240 start_gap. | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* Function is equivalent of lf read + data samples + em410xread | |
134 | * looped until an EM410x tag is detected | |
135 | * | |
136 | * Why is CmdSamples("16000")? | |
137 | * TBD: Auto-grow sample size based on detected sample rate. IE: If the | |
138 | * rate gets lower, then grow the number of samples | |
139 | * Changed by martin, 4000 x 4 = 16000, | |
140 | * see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235 | |
141 | ||
142 | */ | |
143 | int CmdEM410xWatch(const char *Cmd) | |
144 | { | |
145 | do { | |
146 | if (ukbhit()) { | |
147 | printf("\naborted via keyboard!\n"); | |
148 | break; | |
149 | } | |
150 | ||
151 | CmdLFRead(""); | |
152 | CmdSamples("6000"); | |
153 | } while (!CmdEM410xRead("")); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | int CmdEM410xWatchnSpoof(const char *Cmd) | |
159 | { | |
160 | CmdEM410xWatch(Cmd); | |
161 | PrintAndLog("# Replaying captured ID: %s",global_em410xId); | |
162 | CmdLFaskSim(""); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | /* Read the transmitted data of an EM4x50 tag | |
167 | * Format: | |
168 | * | |
169 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
170 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
171 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
172 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
173 | * CCCCCCCC <- column parity bits | |
174 | * 0 <- stop bit | |
175 | * LW <- Listen Window | |
176 | * | |
177 | * This pattern repeats for every block of data being transmitted. | |
178 | * Transmission starts with two Listen Windows (LW - a modulated | |
179 | * pattern of 320 cycles each (32/32/128/64/64)). | |
180 | * | |
181 | * Note that this data may or may not be the UID. It is whatever data | |
182 | * is stored in the blocks defined in the control word First and Last | |
183 | * Word Read values. UID is stored in block 32. | |
184 | */ | |
185 | int CmdEM4x50Read(const char *Cmd) | |
186 | { | |
187 | int i, j, startblock, skip, block, start, end, low, high; | |
188 | bool complete= false; | |
189 | int tmpbuff[MAX_GRAPH_TRACE_LEN / 64]; | |
190 | char tmp[6]; | |
191 | ||
192 | high= low= 0; | |
193 | memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64); | |
194 | ||
195 | /* first get high and low values */ | |
196 | for (i = 0; i < GraphTraceLen; i++) | |
197 | { | |
198 | if (GraphBuffer[i] > high) | |
199 | high = GraphBuffer[i]; | |
200 | else if (GraphBuffer[i] < low) | |
201 | low = GraphBuffer[i]; | |
202 | } | |
203 | ||
204 | /* populate a buffer with pulse lengths */ | |
205 | i= 0; | |
206 | j= 0; | |
207 | while (i < GraphTraceLen) | |
208 | { | |
209 | // measure from low to low | |
210 | while ((GraphBuffer[i] > low) && (i<GraphTraceLen)) | |
211 | ++i; | |
212 | start= i; | |
213 | while ((GraphBuffer[i] < high) && (i<GraphTraceLen)) | |
214 | ++i; | |
215 | while ((GraphBuffer[i] > low) && (i<GraphTraceLen)) | |
216 | ++i; | |
217 | if (j>=(MAX_GRAPH_TRACE_LEN/64)) { | |
218 | break; | |
219 | } | |
220 | tmpbuff[j++]= i - start; | |
221 | } | |
222 | ||
223 | /* look for data start - should be 2 pairs of LW (pulses of 192,128) */ | |
224 | start= -1; | |
225 | skip= 0; | |
226 | for (i= 0; i < j - 4 ; ++i) | |
227 | { | |
228 | skip += tmpbuff[i]; | |
229 | if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194) | |
230 | if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130) | |
231 | if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194) | |
232 | if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130) | |
233 | { | |
234 | start= i + 3; | |
235 | break; | |
236 | } | |
237 | } | |
238 | startblock= i + 3; | |
239 | ||
240 | /* skip over the remainder of the LW */ | |
241 | skip += tmpbuff[i+1]+tmpbuff[i+2]; | |
242 | while (skip < MAX_GRAPH_TRACE_LEN && GraphBuffer[skip] > low) | |
243 | ++skip; | |
244 | skip += 8; | |
245 | ||
246 | /* now do it again to find the end */ | |
247 | end= start; | |
248 | for (i += 3; i < j - 4 ; ++i) | |
249 | { | |
250 | end += tmpbuff[i]; | |
251 | if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194) | |
252 | if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130) | |
253 | if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194) | |
254 | if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130) | |
255 | { | |
256 | complete= true; | |
257 | break; | |
258 | } | |
259 | } | |
260 | ||
261 | if (start >= 0) | |
262 | PrintAndLog("Found data at sample: %i",skip); | |
263 | else | |
264 | { | |
265 | PrintAndLog("No data found!"); | |
266 | PrintAndLog("Try again with more samples."); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | if (!complete) | |
271 | { | |
272 | PrintAndLog("*** Warning!"); | |
273 | PrintAndLog("Partial data - no end found!"); | |
274 | PrintAndLog("Try again with more samples."); | |
275 | } | |
276 | ||
277 | /* get rid of leading crap */ | |
278 | sprintf(tmp,"%i",skip); | |
279 | CmdLtrim(tmp); | |
280 | ||
281 | /* now work through remaining buffer printing out data blocks */ | |
282 | block= 0; | |
283 | i= startblock; | |
284 | while (block < 6) | |
285 | { | |
286 | PrintAndLog("Block %i:", block); | |
287 | // mandemod routine needs to be split so we can call it for data | |
288 | // just print for now for debugging | |
289 | CmdManchesterDemod("i 64"); | |
290 | skip= 0; | |
291 | /* look for LW before start of next block */ | |
292 | for ( ; i < j - 4 ; ++i) | |
293 | { | |
294 | skip += tmpbuff[i]; | |
295 | if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194) | |
296 | if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130) | |
297 | break; | |
298 | } | |
299 | while (GraphBuffer[skip] > low) | |
300 | ++skip; | |
301 | skip += 8; | |
302 | sprintf(tmp,"%i",skip); | |
303 | CmdLtrim(tmp); | |
304 | start += skip; | |
305 | block++; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | int CmdEM410xWrite(const char *Cmd) | |
311 | { | |
312 | uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value | |
313 | int card = 0xFF; // invalid card value | |
314 | unsigned int clock = 0; // invalid clock value | |
315 | ||
316 | sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock); | |
317 | ||
318 | // Check ID | |
319 | if (id == 0xFFFFFFFFFFFFFFFF) { | |
320 | PrintAndLog("Error! ID is required.\n"); | |
321 | return 0; | |
322 | } | |
323 | if (id >= 0x10000000000) { | |
324 | PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n"); | |
325 | return 0; | |
326 | } | |
327 | ||
328 | // Check Card | |
329 | if (card == 0xFF) { | |
330 | PrintAndLog("Error! Card type required.\n"); | |
331 | return 0; | |
332 | } | |
333 | if (card < 0) { | |
334 | PrintAndLog("Error! Bad card type selected.\n"); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | // Check Clock | |
339 | if (card == 1) | |
340 | { | |
341 | // Default: 64 | |
342 | if (clock == 0) | |
343 | clock = 64; | |
344 | ||
345 | // Allowed clock rates: 16, 32 and 64 | |
346 | if ((clock != 16) && (clock != 32) && (clock != 64)) { | |
347 | PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock); | |
348 | return 0; | |
349 | } | |
350 | } | |
351 | else if (clock != 0) | |
352 | { | |
353 | PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n"); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | if (card == 1) { | |
358 | PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock); | |
359 | // NOTE: We really should pass the clock in as a separate argument, but to | |
360 | // provide for backwards-compatibility for older firmware, and to avoid | |
361 | // having to add another argument to CMD_EM410X_WRITE_TAG, we just store | |
362 | // the clock rate in bits 8-15 of the card value | |
363 | card = (card & 0xFF) | (((uint64_t)clock << 8) & 0xFF00); | |
364 | } | |
365 | else if (card == 0) | |
366 | PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock); | |
367 | else { | |
368 | PrintAndLog("Error! Bad card type selected.\n"); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}}; | |
373 | SendCommand(&c); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | int CmdReadWord(const char *Cmd) | |
379 | { | |
380 | int Word = -1; //default to invalid word | |
381 | UsbCommand c; | |
382 | ||
383 | sscanf(Cmd, "%d", &Word); | |
384 | ||
385 | if ( (Word > 15) | (Word < 0) ) { | |
386 | PrintAndLog("Word must be between 0 and 15"); | |
387 | return 1; | |
388 | } | |
389 | ||
390 | PrintAndLog("Reading word %d", Word); | |
391 | ||
392 | c.cmd = CMD_EM4X_READ_WORD; | |
393 | c.d.asBytes[0] = 0x0; //Normal mode | |
394 | c.arg[0] = 0; | |
395 | c.arg[1] = Word; | |
396 | c.arg[2] = 0; | |
397 | SendCommand(&c); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | int CmdReadWordPWD(const char *Cmd) | |
402 | { | |
403 | int Word = -1; //default to invalid word | |
404 | int Password = 0xFFFFFFFF; //default to blank password | |
405 | UsbCommand c; | |
406 | ||
407 | sscanf(Cmd, "%d %x", &Word, &Password); | |
408 | ||
409 | if ( (Word > 15) | (Word < 0) ) { | |
410 | PrintAndLog("Word must be between 0 and 15"); | |
411 | return 1; | |
412 | } | |
413 | ||
414 | PrintAndLog("Reading word %d with password %08X", Word, Password); | |
415 | ||
416 | c.cmd = CMD_EM4X_READ_WORD; | |
417 | c.d.asBytes[0] = 0x1; //Password mode | |
418 | c.arg[0] = 0; | |
419 | c.arg[1] = Word; | |
420 | c.arg[2] = Password; | |
421 | SendCommand(&c); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | int CmdWriteWord(const char *Cmd) | |
426 | { | |
427 | int Word = 16; //default to invalid block | |
428 | int Data = 0xFFFFFFFF; //default to blank data | |
429 | UsbCommand c; | |
430 | ||
431 | sscanf(Cmd, "%x %d", &Data, &Word); | |
432 | ||
433 | if (Word > 15) { | |
434 | PrintAndLog("Word must be between 0 and 15"); | |
435 | return 1; | |
436 | } | |
437 | ||
438 | PrintAndLog("Writing word %d with data %08X", Word, Data); | |
439 | ||
440 | c.cmd = CMD_EM4X_WRITE_WORD; | |
441 | c.d.asBytes[0] = 0x0; //Normal mode | |
442 | c.arg[0] = Data; | |
443 | c.arg[1] = Word; | |
444 | c.arg[2] = 0; | |
445 | SendCommand(&c); | |
446 | return 0; | |
447 | } | |
448 | ||
449 | int CmdWriteWordPWD(const char *Cmd) | |
450 | { | |
451 | int Word = 16; //default to invalid word | |
452 | int Data = 0xFFFFFFFF; //default to blank data | |
453 | int Password = 0xFFFFFFFF; //default to blank password | |
454 | UsbCommand c; | |
455 | ||
456 | sscanf(Cmd, "%x %d %x", &Data, &Word, &Password); | |
457 | ||
458 | if (Word > 15) { | |
459 | PrintAndLog("Word must be between 0 and 15"); | |
460 | return 1; | |
461 | } | |
462 | ||
463 | PrintAndLog("Writing word %d with data %08X and password %08X", Word, Data, Password); | |
464 | ||
465 | c.cmd = CMD_EM4X_WRITE_WORD; | |
466 | c.d.asBytes[0] = 0x1; //Password mode | |
467 | c.arg[0] = Data; | |
468 | c.arg[1] = Word; | |
469 | c.arg[2] = Password; | |
470 | SendCommand(&c); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static command_t CommandTable[] = | |
475 | { | |
476 | {"help", CmdHelp, 1, "This help"}, | |
477 | {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"}, | |
478 | {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag"}, | |
479 | {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"}, | |
480 | {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"}, | |
481 | {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" }, | |
482 | {"em410xwrite", CmdEM410xWrite, 1, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"}, | |
483 | {"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"}, | |
484 | {"readword", CmdReadWord, 1, "<Word> -- Read EM4xxx word data"}, | |
485 | {"readwordPWD", CmdReadWordPWD, 1, "<Word> <Password> -- Read EM4xxx word data in password mode"}, | |
486 | {"writeword", CmdWriteWord, 1, "<Data> <Word> -- Write EM4xxx word data"}, | |
487 | {"writewordPWD", CmdWriteWordPWD, 1, "<Data> <Word> <Password> -- Write EM4xxx word data in password mode"}, | |
488 | {NULL, NULL, 0, NULL} | |
489 | }; | |
490 | ||
491 | int CmdLFEM4X(const char *Cmd) | |
492 | { | |
493 | CmdsParse(CommandTable, Cmd); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | int CmdHelp(const char *Cmd) | |
498 | { | |
499 | CmdsHelp(CommandTable); | |
500 | return 0; | |
501 | } |