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" |
7fe9b0b7 |
19 | |
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 | { |
221 | FILE *f = fopen(Cmd, "r"); |
222 | if(!f) { |
223 | PrintAndLog("couldn't open '%s'", Cmd); |
224 | return -1; |
225 | } |
226 | char line[80]; int offset = 0; unsigned int data[8]; |
227 | while(fgets(line, sizeof(line), f)) { |
228 | int res = sscanf(line, "%x %x %x %x %x %x %x %x", |
229 | &data[0], &data[1], &data[2], &data[3], |
230 | &data[4], &data[5], &data[6], &data[7]); |
231 | if(res != 8) { |
232 | PrintAndLog("Error: could not read samples"); |
233 | fclose(f); |
234 | return -1; |
235 | } |
236 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}}; |
237 | int j; for(j = 0; j < 8; j++) { |
238 | c.d.asBytes[j] = data[j]; |
239 | } |
240 | SendCommand(&c); |
902cb3c0 |
241 | WaitForResponse(CMD_ACK, NULL); |
3612a8a8 |
242 | offset += 8; |
243 | } |
244 | fclose(f); |
245 | PrintAndLog("loaded %u samples", offset); |
246 | return 0; |
247 | } |
248 | |
249 | int CmdLegicSave(const char *Cmd) |
250 | { |
3612a8a8 |
251 | int requested = 1024; |
252 | int offset = 0; |
4961e292 |
253 | int delivered = 0; |
3612a8a8 |
254 | char filename[1024]; |
4961e292 |
255 | uint8_t got[1024]; |
256 | |
3612a8a8 |
257 | sscanf(Cmd, " %s %i %i", filename, &requested, &offset); |
3612a8a8 |
258 | |
4961e292 |
259 | /* If no length given save entire legic read buffer */ |
260 | /* round up to nearest 8 bytes so the saved data can be used with legicload */ |
3612a8a8 |
261 | if (requested == 0) { |
4961e292 |
262 | requested = 1024; |
3612a8a8 |
263 | } |
4961e292 |
264 | if (requested % 8 != 0) { |
265 | int remainder = requested % 8; |
266 | requested = requested + 8 - remainder; |
267 | } |
4961e292 |
268 | if (offset + requested > sizeof(got)) { |
269 | PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024"); |
270 | return 0; |
271 | } |
272 | |
3612a8a8 |
273 | FILE *f = fopen(filename, "w"); |
274 | if(!f) { |
275 | PrintAndLog("couldn't open '%s'", Cmd+1); |
276 | return -1; |
277 | } |
278 | |
4961e292 |
279 | GetFromBigBuf(got,requested,offset); |
280 | WaitForResponse(CMD_ACK,NULL); |
281 | |
282 | for (int j = 0; j < requested; j += 8) { |
283 | fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n", |
284 | got[j+0], |
285 | got[j+1], |
286 | got[j+2], |
287 | got[j+3], |
288 | got[j+4], |
289 | got[j+5], |
290 | got[j+6], |
291 | got[j+7] |
292 | ); |
293 | delivered += 8; |
3612a8a8 |
294 | if (delivered >= requested) |
295 | break; |
296 | } |
297 | |
298 | fclose(f); |
299 | PrintAndLog("saved %u samples", delivered); |
300 | return 0; |
301 | } |
302 | |
303 | int CmdLegicRfSim(const char *Cmd) |
304 | { |
305 | UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF}; |
306 | c.arg[0] = 6; |
307 | c.arg[1] = 3; |
308 | c.arg[2] = 0; |
1a07fd51 |
309 | sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]); |
3612a8a8 |
310 | SendCommand(&c); |
311 | return 0; |
312 | } |
313 | |
314 | int CmdLegicRfWrite(const char *Cmd) |
315 | { |
316 | UsbCommand c={CMD_WRITER_LEGIC_RF}; |
125a98a1 |
317 | int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]); |
3612a8a8 |
318 | if(res != 2) { |
319 | PrintAndLog("Please specify the offset and length as two hex strings"); |
320 | return -1; |
321 | } |
322 | SendCommand(&c); |
323 | return 0; |
324 | } |
325 | |
326 | int CmdLegicRfFill(const char *Cmd) |
327 | { |
328 | UsbCommand cmd ={CMD_WRITER_LEGIC_RF}; |
1a07fd51 |
329 | int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]); |
3612a8a8 |
330 | if(res != 3) { |
331 | PrintAndLog("Please specify the offset, length and value as two hex strings"); |
332 | return -1; |
333 | } |
334 | |
335 | int i; |
336 | UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}}; |
337 | for(i = 0; i < 48; i++) { |
338 | c.d.asBytes[i] = cmd.arg[2]; |
339 | } |
340 | for(i = 0; i < 22; i++) { |
341 | c.arg[0] = i*48; |
342 | SendCommand(&c); |
902cb3c0 |
343 | WaitForResponse(CMD_ACK,NULL); |
3612a8a8 |
344 | } |
345 | SendCommand(&cmd); |
346 | return 0; |
347 | } |
348 | |