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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> | |
902cb3c0 | 13 | #include "proxmark3.h" |
41dab153 | 14 | #include "data.h" |
15 | #include "ui.h" | |
7fe9b0b7 | 16 | #include "cmdparser.h" |
17 | #include "cmdhflegic.h" | |
669c1b80 | 18 | #include "cmdmain.h" |
31d1caa5 | 19 | #include "util.h" |
7fe9b0b7 | 20 | static int CmdHelp(const char *Cmd); |
21 | ||
7fe9b0b7 | 22 | static command_t CommandTable[] = |
23 | { | |
24 | {"help", CmdHelp, 1, "This help"}, | |
669c1b80 | 25 | {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"}, |
41dab153 | 26 | {"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"}, |
3612a8a8 | 27 | {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"}, |
28 | {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"}, | |
29 | {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"}, | |
30 | {"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"}, | |
31 | {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"}, | |
7fe9b0b7 | 32 | {NULL, NULL, 0, NULL} |
33 | }; | |
34 | ||
35 | int CmdHFLegic(const char *Cmd) | |
36 | { | |
37 | CmdsParse(CommandTable, Cmd); | |
38 | return 0; | |
39 | } | |
40 | ||
41 | int CmdHelp(const char *Cmd) | |
42 | { | |
43 | CmdsHelp(CommandTable); | |
44 | return 0; | |
45 | } | |
669c1b80 | 46 | |
47 | /* | |
48 | * Output BigBuf and deobfuscate LEGIC RF tag data. | |
49 | * This is based on information given in the talk held | |
50 | * by Henryk Ploetz and Karsten Nohl at 26c3 | |
669c1b80 | 51 | */ |
52 | int CmdLegicDecode(const char *Cmd) | |
53 | { | |
4961e292 | 54 | int i, j, k, n; |
669c1b80 | 55 | int segment_len = 0; |
56 | int segment_flag = 0; | |
57 | int stamp_len = 0; | |
58 | int crc = 0; | |
59 | int wrp = 0; | |
60 | int wrc = 0; | |
4961e292 | 61 | uint8_t data_buf[1024]; // receiver buffer |
669c1b80 | 62 | char out_string[3076]; // just use big buffer - bad practice |
63 | char token_type[4]; | |
669c1b80 | 64 | |
65 | // copy data from proxmark into buffer | |
4961e292 | 66 | GetFromBigBuf(data_buf,sizeof(data_buf),0); |
67 | WaitForResponse(CMD_ACK,NULL); | |
669c1b80 | 68 | |
69 | // Output CDF System area (9 bytes) plus remaining header area (12 bytes) | |
70 | ||
71 | PrintAndLog("\nCDF: System Area"); | |
72 | ||
73 | PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x", | |
74 | data_buf[0], | |
75 | data_buf[1], | |
76 | data_buf[2], | |
77 | data_buf[3], | |
78 | data_buf[4] | |
79 | ); | |
80 | ||
81 | crc = data_buf[4]; | |
82 | ||
83 | switch (data_buf[5]&0x7f) { | |
84 | case 0x00 ... 0x2f: | |
85 | strncpy(token_type, "IAM",sizeof(token_type)); | |
86 | break; | |
87 | case 0x30 ... 0x6f: | |
88 | strcpy(token_type, "SAM"); | |
89 | break; | |
90 | case 0x70 ... 0x7f: | |
91 | strcpy(token_type, "GAM"); | |
92 | break; | |
93 | default: | |
94 | strcpy(token_type, "???"); | |
95 | break; | |
96 | } | |
97 | ||
98 | stamp_len = 0xfc - data_buf[6]; | |
99 | ||
100 | PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u", | |
101 | data_buf[5], | |
102 | data_buf[6], | |
103 | token_type, | |
104 | (data_buf[5]&0x80)>>7, | |
105 | stamp_len | |
106 | ); | |
107 | ||
108 | PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x", | |
109 | data_buf[7]&0x0f, | |
110 | (data_buf[7]&0x70)>>4, | |
111 | (data_buf[7]&0x80)>>7, | |
112 | data_buf[7], | |
113 | data_buf[8] | |
114 | ); | |
115 | ||
116 | PrintAndLog("Remaining Header Area"); | |
117 | ||
118 | PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x", | |
119 | data_buf[9], | |
120 | data_buf[10], | |
121 | data_buf[11], | |
122 | data_buf[12], | |
123 | data_buf[13], | |
124 | data_buf[14], | |
125 | data_buf[15], | |
126 | data_buf[16], | |
127 | data_buf[17], | |
128 | data_buf[18], | |
129 | data_buf[19], | |
130 | data_buf[20], | |
131 | data_buf[21] | |
132 | ); | |
133 | ||
134 | PrintAndLog("\nADF: User Area"); | |
135 | ||
41dab153 | 136 | i = 22; |
669c1b80 | 137 | for (n=0; n<64; n++) { |
138 | segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc); | |
139 | segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4; | |
140 | ||
141 | wrp = (data_buf[i+2]^crc); | |
142 | wrc = ((data_buf[i+3]^crc)&0x70)>>4; | |
143 | ||
144 | 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", | |
145 | n, | |
146 | data_buf[i]^crc, | |
147 | data_buf[i+1]^crc, | |
148 | data_buf[i+2]^crc, | |
149 | data_buf[i+3]^crc, | |
150 | segment_flag, | |
151 | (segment_flag&0x4)>>2, | |
152 | (segment_flag&0x8)>>3, | |
153 | segment_len, | |
154 | wrp, | |
155 | wrc, | |
156 | ((data_buf[i+3]^crc)&0x80)>>7, | |
157 | (data_buf[i+4]^crc) | |
158 | ); | |
159 | ||
160 | i+=5; | |
161 | ||
162 | if (wrc>0) { | |
163 | PrintAndLog("WRC protected area:"); | |
31332265 | 164 | for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
669c1b80 | 165 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); |
166 | out_string[j+2] = ' '; | |
167 | }; | |
168 | ||
169 | out_string[j] = '\0'; | |
170 | ||
171 | PrintAndLog("%s", out_string); | |
172 | } | |
173 | ||
174 | if (wrp>wrc) { | |
175 | PrintAndLog("Remaining write protected area:"); | |
176 | ||
31332265 | 177 | for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
669c1b80 | 178 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); |
179 | out_string[j+2] = ' '; | |
180 | }; | |
181 | ||
182 | out_string[j] = '\0'; | |
183 | ||
184 | PrintAndLog("%s", out_string); | |
185 | if((wrp-wrc) == 8) { | |
186 | sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc); | |
187 | PrintAndLog("%s", out_string); | |
188 | } | |
189 | } | |
190 | ||
191 | PrintAndLog("Remaining segment payload:"); | |
31332265 | 192 | for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) { |
669c1b80 | 193 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); |
194 | out_string[j+2] = ' '; | |
195 | }; | |
196 | ||
197 | out_string[j] = '\0'; | |
198 | ||
199 | PrintAndLog("%s", out_string); | |
200 | ||
201 | // end with last segment | |
202 | if (segment_flag & 0x8) | |
203 | return 0; | |
204 | }; | |
205 | return 0; | |
206 | } | |
41dab153 | 207 | |
208 | int CmdLegicRFRead(const char *Cmd) | |
209 | { | |
210 | int byte_count=0,offset=0; | |
211 | sscanf(Cmd, "%i %i", &offset, &byte_count); | |
a2b1414f | 212 | if(byte_count == 0) byte_count = -1; |
213 | if(byte_count + offset > 1024) byte_count = 1024 - offset; | |
41dab153 | 214 | UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}}; |
215 | SendCommand(&c); | |
216 | return 0; | |
217 | } | |
3612a8a8 | 218 | |
219 | int CmdLegicLoad(const char *Cmd) | |
220 | { | |
b915fda3 | 221 | char filename[FILE_PATH_SIZE] = {0x00}; |
222 | int len = 0; | |
223 | ||
224 | if (param_getchar(Cmd, 0) == 'h' || param_getchar(Cmd, 0)== 0x00) { | |
225 | PrintAndLog("It loads datasamples from the file `filename`"); | |
226 | PrintAndLog("Usage: hf legic load <file name>"); | |
227 | PrintAndLog(" sample: hf legic load filename"); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | len = strlen(Cmd); | |
232 | if (len > FILE_PATH_SIZE) { | |
233 | PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE); | |
234 | return 0; | |
235 | } | |
236 | memcpy(filename, Cmd, len); | |
237 | ||
238 | FILE *f = fopen(filename, "r"); | |
3612a8a8 | 239 | if(!f) { |
240 | PrintAndLog("couldn't open '%s'", Cmd); | |
241 | return -1; | |
242 | } | |
243 | char line[80]; int offset = 0; unsigned int data[8]; | |
244 | while(fgets(line, sizeof(line), f)) { | |
245 | int res = sscanf(line, "%x %x %x %x %x %x %x %x", | |
246 | &data[0], &data[1], &data[2], &data[3], | |
247 | &data[4], &data[5], &data[6], &data[7]); | |
248 | if(res != 8) { | |
249 | PrintAndLog("Error: could not read samples"); | |
250 | fclose(f); | |
251 | return -1; | |
252 | } | |
253 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}}; | |
254 | int j; for(j = 0; j < 8; j++) { | |
255 | c.d.asBytes[j] = data[j]; | |
256 | } | |
257 | SendCommand(&c); | |
902cb3c0 | 258 | WaitForResponse(CMD_ACK, NULL); |
3612a8a8 | 259 | offset += 8; |
260 | } | |
261 | fclose(f); | |
262 | PrintAndLog("loaded %u samples", offset); | |
263 | return 0; | |
264 | } | |
265 | ||
266 | int CmdLegicSave(const char *Cmd) | |
267 | { | |
3612a8a8 | 268 | int requested = 1024; |
269 | int offset = 0; | |
4961e292 | 270 | int delivered = 0; |
b915fda3 | 271 | char filename[FILE_PATH_SIZE]; |
4961e292 | 272 | uint8_t got[1024]; |
273 | ||
3612a8a8 | 274 | sscanf(Cmd, " %s %i %i", filename, &requested, &offset); |
3612a8a8 | 275 | |
4961e292 | 276 | /* If no length given save entire legic read buffer */ |
277 | /* round up to nearest 8 bytes so the saved data can be used with legicload */ | |
3612a8a8 | 278 | if (requested == 0) { |
4961e292 | 279 | requested = 1024; |
3612a8a8 | 280 | } |
4961e292 | 281 | if (requested % 8 != 0) { |
282 | int remainder = requested % 8; | |
283 | requested = requested + 8 - remainder; | |
284 | } | |
4961e292 | 285 | if (offset + requested > sizeof(got)) { |
286 | PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024"); | |
287 | return 0; | |
288 | } | |
289 | ||
3612a8a8 | 290 | FILE *f = fopen(filename, "w"); |
291 | if(!f) { | |
292 | PrintAndLog("couldn't open '%s'", Cmd+1); | |
293 | return -1; | |
294 | } | |
295 | ||
4961e292 | 296 | GetFromBigBuf(got,requested,offset); |
297 | WaitForResponse(CMD_ACK,NULL); | |
298 | ||
299 | for (int j = 0; j < requested; j += 8) { | |
300 | fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
301 | got[j+0], | |
302 | got[j+1], | |
303 | got[j+2], | |
304 | got[j+3], | |
305 | got[j+4], | |
306 | got[j+5], | |
307 | got[j+6], | |
308 | got[j+7] | |
309 | ); | |
310 | delivered += 8; | |
3612a8a8 | 311 | if (delivered >= requested) |
312 | break; | |
313 | } | |
314 | ||
315 | fclose(f); | |
316 | PrintAndLog("saved %u samples", delivered); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | int CmdLegicRfSim(const char *Cmd) | |
321 | { | |
322 | UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF}; | |
323 | c.arg[0] = 6; | |
324 | c.arg[1] = 3; | |
325 | c.arg[2] = 0; | |
1a07fd51 | 326 | sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]); |
3612a8a8 | 327 | SendCommand(&c); |
328 | return 0; | |
329 | } | |
330 | ||
331 | int CmdLegicRfWrite(const char *Cmd) | |
332 | { | |
333 | UsbCommand c={CMD_WRITER_LEGIC_RF}; | |
125a98a1 | 334 | int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]); |
3612a8a8 | 335 | if(res != 2) { |
336 | PrintAndLog("Please specify the offset and length as two hex strings"); | |
337 | return -1; | |
338 | } | |
339 | SendCommand(&c); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | int CmdLegicRfFill(const char *Cmd) | |
344 | { | |
345 | UsbCommand cmd ={CMD_WRITER_LEGIC_RF}; | |
1a07fd51 | 346 | int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]); |
3612a8a8 | 347 | if(res != 3) { |
348 | PrintAndLog("Please specify the offset, length and value as two hex strings"); | |
349 | return -1; | |
350 | } | |
351 | ||
352 | int i; | |
353 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}}; | |
354 | for(i = 0; i < 48; i++) { | |
355 | c.d.asBytes[i] = cmd.arg[2]; | |
356 | } | |
357 | for(i = 0; i < 22; i++) { | |
358 | c.arg[0] = i*48; | |
359 | SendCommand(&c); | |
902cb3c0 | 360 | WaitForResponse(CMD_ACK,NULL); |
3612a8a8 | 361 | } |
362 | SendCommand(&cmd); | |
363 | return 0; | |
364 | } | |
365 |