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a553f267 | 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 | ||
8e220a91 | 11 | #include <stdio.h> |
12 | #include <string.h> | |
43534cba | 13 | #include <inttypes.h> |
902cb3c0 | 14 | #include "proxmark3.h" |
41dab153 | 15 | #include "data.h" |
16 | #include "ui.h" | |
7fe9b0b7 | 17 | #include "cmdparser.h" |
18 | #include "cmdhflegic.h" | |
669c1b80 | 19 | #include "cmdmain.h" |
31d1caa5 | 20 | #include "util.h" |
7fe9b0b7 | 21 | static int CmdHelp(const char *Cmd); |
22 | ||
7fe9b0b7 | 23 | static command_t CommandTable[] = |
24 | { | |
25 | {"help", CmdHelp, 1, "This help"}, | |
669c1b80 | 26 | {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"}, |
41dab153 | 27 | {"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"}, |
3612a8a8 | 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"}, | |
7fe9b0b7 | 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 | } | |
669c1b80 | 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 | |
669c1b80 | 52 | */ |
53 | int CmdLegicDecode(const char *Cmd) | |
54 | { | |
4961e292 | 55 | int i, j, k, n; |
669c1b80 | 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; | |
bf824347 | 62 | uint8_t data_buf[1053]; // receiver buffer |
669c1b80 | 63 | char out_string[3076]; // just use big buffer - bad practice |
64 | char token_type[4]; | |
669c1b80 | 65 | |
66 | // copy data from proxmark into buffer | |
4961e292 | 67 | GetFromBigBuf(data_buf,sizeof(data_buf),0); |
68 | WaitForResponse(CMD_ACK,NULL); | |
669c1b80 | 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 | ||
41dab153 | 137 | i = 22; |
669c1b80 | 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:"); | |
31332265 | 165 | for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
669c1b80 | 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 | ||
31332265 | 178 | for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
669c1b80 | 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:"); | |
31332265 | 193 | for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
669c1b80 | 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 | } | |
41dab153 | 208 | |
209 | int CmdLegicRFRead(const char *Cmd) | |
210 | { | |
211 | int byte_count=0,offset=0; | |
212 | sscanf(Cmd, "%i %i", &offset, &byte_count); | |
a2b1414f | 213 | if(byte_count == 0) byte_count = -1; |
214 | if(byte_count + offset > 1024) byte_count = 1024 - offset; | |
41dab153 | 215 | UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}}; |
216 | SendCommand(&c); | |
217 | return 0; | |
218 | } | |
3612a8a8 | 219 | |
220 | int CmdLegicLoad(const char *Cmd) | |
221 | { | |
b915fda3 | 222 | char filename[FILE_PATH_SIZE] = {0x00}; |
223 | int len = 0; | |
224 | ||
225 | if (param_getchar(Cmd, 0) == 'h' || param_getchar(Cmd, 0)== 0x00) { | |
226 | PrintAndLog("It loads datasamples from the file `filename`"); | |
227 | PrintAndLog("Usage: hf legic load <file name>"); | |
228 | PrintAndLog(" sample: hf legic load filename"); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | len = strlen(Cmd); | |
233 | if (len > FILE_PATH_SIZE) { | |
234 | PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE); | |
235 | return 0; | |
236 | } | |
237 | memcpy(filename, Cmd, len); | |
238 | ||
239 | FILE *f = fopen(filename, "r"); | |
3612a8a8 | 240 | if(!f) { |
241 | PrintAndLog("couldn't open '%s'", Cmd); | |
242 | return -1; | |
243 | } | |
244 | char line[80]; int offset = 0; unsigned int data[8]; | |
245 | while(fgets(line, sizeof(line), f)) { | |
246 | int res = sscanf(line, "%x %x %x %x %x %x %x %x", | |
247 | &data[0], &data[1], &data[2], &data[3], | |
248 | &data[4], &data[5], &data[6], &data[7]); | |
249 | if(res != 8) { | |
250 | PrintAndLog("Error: could not read samples"); | |
251 | fclose(f); | |
252 | return -1; | |
253 | } | |
254 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}}; | |
255 | int j; for(j = 0; j < 8; j++) { | |
256 | c.d.asBytes[j] = data[j]; | |
257 | } | |
258 | SendCommand(&c); | |
902cb3c0 | 259 | WaitForResponse(CMD_ACK, NULL); |
3612a8a8 | 260 | offset += 8; |
261 | } | |
262 | fclose(f); | |
263 | PrintAndLog("loaded %u samples", offset); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | int CmdLegicSave(const char *Cmd) | |
268 | { | |
3612a8a8 | 269 | int requested = 1024; |
270 | int offset = 0; | |
4961e292 | 271 | int delivered = 0; |
b915fda3 | 272 | char filename[FILE_PATH_SIZE]; |
4961e292 | 273 | uint8_t got[1024]; |
274 | ||
3612a8a8 | 275 | sscanf(Cmd, " %s %i %i", filename, &requested, &offset); |
3612a8a8 | 276 | |
4961e292 | 277 | /* If no length given save entire legic read buffer */ |
278 | /* round up to nearest 8 bytes so the saved data can be used with legicload */ | |
3612a8a8 | 279 | if (requested == 0) { |
4961e292 | 280 | requested = 1024; |
3612a8a8 | 281 | } |
4961e292 | 282 | if (requested % 8 != 0) { |
283 | int remainder = requested % 8; | |
284 | requested = requested + 8 - remainder; | |
285 | } | |
4961e292 | 286 | if (offset + requested > sizeof(got)) { |
287 | PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024"); | |
288 | return 0; | |
289 | } | |
290 | ||
3612a8a8 | 291 | FILE *f = fopen(filename, "w"); |
292 | if(!f) { | |
293 | PrintAndLog("couldn't open '%s'", Cmd+1); | |
294 | return -1; | |
295 | } | |
296 | ||
4961e292 | 297 | GetFromBigBuf(got,requested,offset); |
298 | WaitForResponse(CMD_ACK,NULL); | |
299 | ||
300 | for (int j = 0; j < requested; j += 8) { | |
301 | fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
302 | got[j+0], | |
303 | got[j+1], | |
304 | got[j+2], | |
305 | got[j+3], | |
306 | got[j+4], | |
307 | got[j+5], | |
308 | got[j+6], | |
309 | got[j+7] | |
310 | ); | |
311 | delivered += 8; | |
3612a8a8 | 312 | if (delivered >= requested) |
313 | break; | |
314 | } | |
315 | ||
316 | fclose(f); | |
317 | PrintAndLog("saved %u samples", delivered); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | int CmdLegicRfSim(const char *Cmd) | |
322 | { | |
323 | UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF}; | |
324 | c.arg[0] = 6; | |
325 | c.arg[1] = 3; | |
326 | c.arg[2] = 0; | |
43534cba | 327 | sscanf(Cmd, " %" SCNi64 " %" SCNi64 " %" SCNi64, &c.arg[0], &c.arg[1], &c.arg[2]); |
3612a8a8 | 328 | SendCommand(&c); |
329 | return 0; | |
330 | } | |
331 | ||
332 | int CmdLegicRfWrite(const char *Cmd) | |
333 | { | |
334 | UsbCommand c={CMD_WRITER_LEGIC_RF}; | |
43534cba | 335 | int res = sscanf(Cmd, " 0x%" SCNx64 " 0x%" SCNx64, &c.arg[0], &c.arg[1]); |
3612a8a8 | 336 | if(res != 2) { |
337 | PrintAndLog("Please specify the offset and length as two hex strings"); | |
338 | return -1; | |
339 | } | |
340 | SendCommand(&c); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | int CmdLegicRfFill(const char *Cmd) | |
345 | { | |
346 | UsbCommand cmd ={CMD_WRITER_LEGIC_RF}; | |
43534cba | 347 | int res = sscanf(Cmd, " 0x%" SCNx64 " 0x%" SCNx64 " 0x%" SCNx64, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]); |
3612a8a8 | 348 | if(res != 3) { |
349 | PrintAndLog("Please specify the offset, length and value as two hex strings"); | |
350 | return -1; | |
351 | } | |
352 | ||
353 | int i; | |
354 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}}; | |
355 | for(i = 0; i < 48; i++) { | |
356 | c.d.asBytes[i] = cmd.arg[2]; | |
357 | } | |
358 | for(i = 0; i < 22; i++) { | |
359 | c.arg[0] = i*48; | |
360 | SendCommand(&c); | |
902cb3c0 | 361 | WaitForResponse(CMD_ACK,NULL); |
3612a8a8 | 362 | } |
363 | SendCommand(&cmd); | |
364 | return 0; | |
365 | } | |
366 |