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1 //-----------------------------------------------------------------------------
2 // Copyright (C) 2012 Roel Verdult
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 Hitag support
9 //-----------------------------------------------------------------------------
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include "data.h"
15 //#include "proxusb.h"
16 #include "proxmark3.h"
17 #include "ui.h"
18 #include "cmdparser.h"
19 #include "common.h"
20 #include "util.h"
21 #include "hitag2.h"
22 #include "sleep.h"
23 #include "cmdmain.h"
24
25 static int CmdHelp(const char *Cmd);
26
27 size_t nbytes(size_t nbits) {
28 return (nbits/8)+((nbits%8)>0);
29 }
30
31 int CmdLFHitagList(const char *Cmd)
32 {
33 uint8_t got[3000];
34 GetFromBigBuf(got,sizeof(got),0);
35 WaitForResponse(CMD_ACK,NULL);
36
37 PrintAndLog("recorded activity:");
38 PrintAndLog(" ETU :nbits: who bytes");
39 PrintAndLog("---------+-----+----+-----------");
40
41 int i = 0;
42 int prev = -1;
43
44 for (;;) {
45 if(i >= 1900) {
46 break;
47 }
48
49 bool isResponse;
50 int timestamp = *((uint32_t *)(got+i));
51 if (timestamp & 0x80000000) {
52 timestamp &= 0x7fffffff;
53 isResponse = 1;
54 } else {
55 isResponse = 0;
56 }
57
58 int parityBits = *((uint32_t *)(got+i+4));
59 // 4 bytes of additional information...
60 // maximum of 32 additional parity bit information
61 //
62 // TODO:
63 // at each quarter bit period we can send power level (16 levels)
64 // or each half bit period in 256 levels.
65
66 int bits = got[i+8];
67 int len = nbytes(got[i+8]);
68
69 if (len > 100) {
70 break;
71 }
72 if (i + len >= 1900) {
73 break;
74 }
75
76 uint8_t *frame = (got+i+9);
77
78 // Break and stick with current result if buffer was not completely full
79 if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
80
81 char line[1000] = "";
82 int j;
83 for (j = 0; j < len; j++) {
84 int oddparity = 0x01;
85 int k;
86
87 for (k=0;k<8;k++) {
88 oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
89 }
90
91 //if((parityBits >> (len - j - 1)) & 0x01) {
92 if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
93 sprintf(line+(j*4), "%02x! ", frame[j]);
94 }
95 else {
96 sprintf(line+(j*4), "%02x ", frame[j]);
97 }
98 }
99
100 PrintAndLog(" +%7d: %3d: %s %s",
101 (prev < 0 ? 0 : (timestamp - prev)),
102 bits,
103 (isResponse ? "TAG" : " "),
104 line);
105
106
107 // if (pf) {
108 // fprintf(pf," +%7d: %3d: %s %s\n",
109 // (prev < 0 ? 0 : (timestamp - prev)),
110 // bits,
111 // (isResponse ? "TAG" : " "),
112 // line);
113 // }
114
115 prev = timestamp;
116 i += (len + 9);
117 }
118
119
120 return 0;
121 }
122
123 int CmdLFHitagSnoop(const char *Cmd) {
124 UsbCommand c = {CMD_SNOOP_HITAG};
125 SendCommand(&c);
126 return 0;
127 }
128
129 int CmdLFHitagSim(const char *Cmd) {
130 UsbCommand c = {CMD_SIMULATE_HITAG};
131 char filename[256] = { 0x00 };
132 FILE* pf;
133 bool tag_mem_supplied;
134
135 param_getstr(Cmd,0,filename);
136
137 if (strlen(filename) > 0) {
138 if ((pf = fopen(filename,"rb+")) == NULL) {
139 PrintAndLog("Error: Could not open file [%s]",filename);
140 return 1;
141 }
142 tag_mem_supplied = true;
143 if (fread(c.d.asBytes,48,1,pf) == 0) {
144 PrintAndLog("Error: File reading error");
145 fclose(pf);
146 return 1;
147 }
148 fclose(pf);
149 } else {
150 tag_mem_supplied = false;
151 }
152
153 // Does the tag comes with memory
154 c.arg[0] = (uint32_t)tag_mem_supplied;
155
156 SendCommand(&c);
157 return 0;
158 }
159
160 int CmdLFHitagReader(const char *Cmd) {
161 // UsbCommand c = {CMD_READER_HITAG};
162
163 // param_get32ex(Cmd,1,0,16);
164 UsbCommand c = {CMD_READER_HITAG};//, {param_get32ex(Cmd,0,0,10),param_get32ex(Cmd,1,0,16),param_get32ex(Cmd,2,0,16),param_get32ex(Cmd,3,0,16)}};
165 hitag_data* htd = (hitag_data*)c.d.asBytes;
166 hitag_function htf = param_get32ex(Cmd,0,0,10);
167
168 switch (htf) {
169 case RHT2F_PASSWORD: {
170 num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
171 } break;
172 case RHT2F_AUTHENTICATE: {
173 num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
174 num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
175 } break;
176 case RHT2F_CRYPTO: {
177 num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
178 // num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
179 } break;
180 case RHT2F_TEST_AUTH_ATTEMPTS: {
181 // No additional parameters needed
182 } break;
183 default: {
184 PrintAndLog("Error: unkown reader function %d",htf);
185 PrintAndLog("Hitag reader functions");
186 PrintAndLog(" HitagS (0*)");
187 PrintAndLog(" Hitag1 (1*)");
188 PrintAndLog(" Hitag2 (2*)");
189 PrintAndLog(" 21 <password> (password mode)");
190 PrintAndLog(" 22 <nr> <ar> (authentication)");
191 PrintAndLog(" 23 <key> (authentication) key is in format: ISK high + ISK low");
192 PrintAndLog(" 25 (test recorded authentications)");
193 return 1;
194 } break;
195 }
196
197 // Copy the hitag2 function into the first argument
198 c.arg[0] = htf;
199
200 // Send the command to the proxmark
201 SendCommand(&c);
202
203 UsbCommand resp;
204 WaitForResponse(CMD_ACK,&resp);
205
206 // Check the return status, stored in the first argument
207 if (resp.arg[0] == false) return 1;
208
209 uint32_t id = bytes_to_num(resp.d.asBytes,4);
210 char filename[256];
211 FILE* pf = NULL;
212
213 sprintf(filename,"%08x_%04x.ht2",id,(rand() & 0xffff));
214 if ((pf = fopen(filename,"wb")) == NULL) {
215 PrintAndLog("Error: Could not open file [%s]",filename);
216 return 1;
217 }
218
219 // Write the 48 tag memory bytes to file and finalize
220 fwrite(resp.d.asBytes,1,48,pf);
221 fclose(pf);
222
223 PrintAndLog("Succesfully saved tag memory to [%s]",filename);
224
225 return 0;
226 }
227
228 static command_t CommandTableHitag[] =
229 {
230 {"help", CmdHelp, 1, "This help"},
231 {"list", CmdLFHitagList, 1, "List Hitag trace history"},
232 {"reader", CmdLFHitagReader, 1, "Act like a Hitag Reader"},
233 {"sim", CmdLFHitagSim, 1, "Simulate Hitag transponder"},
234 {"snoop", CmdLFHitagSnoop, 1, "Eavesdrop Hitag communication"},
235 {NULL, NULL, 0, NULL}
236 };
237
238 int CmdLFHitag(const char *Cmd)
239 {
240 CmdsParse(CommandTableHitag, Cmd);
241 return 0;
242 }
243
244 int CmdHelp(const char *Cmd)
245 {
246 CmdsHelp(CommandTableHitag);
247 return 0;
248 }
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