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1 //-----------------------------------------------------------------------------
2 //
3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
4 // at your option, any later version. See the LICENSE.txt file for the text of
5 // the license.
6 //-----------------------------------------------------------------------------
7 // Low frequency Presco tag commands
8 // ASK/Manchester, rf/32, 128 bits (complete)
9 //-----------------------------------------------------------------------------
10 #include <string.h>
11 #include <inttypes.h>
12 #include <stdio.h>
13 #include "cmdlfpresco.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 "cmdmain.h"
21 #include "cmdlf.h"
22 #include "protocols.h" // for T55xx config register definitions
23 #include "lfdemod.h" // parityTest
24
25 static int CmdHelp(const char *Cmd);
26
27 int usage_lf_presco_clone(void){
28 PrintAndLog("clone a Presco tag to a T55x7 tag.");
29 PrintAndLog("Usage: lf presco clone d <Card-ID> H <hex-ID> <Q5>");
30 PrintAndLog("Options :");
31 PrintAndLog(" d <Card-ID> : 9 digit presco card ID");
32 PrintAndLog(" H <hex-ID> : 8 digit hex card number");
33 PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
34 PrintAndLog("");
35 PrintAndLog("Sample : lf presco clone d 123456789");
36 return 0;
37 }
38
39 int usage_lf_presco_sim(void) {
40 PrintAndLog("Enables simulation of presco card with specified card number.");
41 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
42 PrintAndLog("Per presco format, the card number is 9 digit number and can contain *# chars. Larger values are truncated.");
43 PrintAndLog("");
44 PrintAndLog("Usage: lf presco sim d <Card-ID> or H <hex-ID>");
45 PrintAndLog("Options :");
46 PrintAndLog(" d <Card-ID> : 9 digit presco card number");
47 PrintAndLog(" H <hex-ID> : 8 digit hex card number");
48 PrintAndLog("");
49 PrintAndLog("Sample : lf presco sim d 123456789");
50 return 0;
51 }
52
53 // convert base 12 ID to sitecode & usercode & 8 bit other unknown code
54 int GetWiegandFromPresco(const char *Cmd, uint32_t *sitecode, uint32_t *usercode, uint32_t *fullcode, bool *Q5) {
55
56 uint8_t val = 0;
57 bool hex = false, errors = false;
58 uint8_t cmdp = 0;
59 char id[11];
60 int stringlen = 0;
61 while(param_getchar(Cmd, cmdp) != 0x00) {
62 switch(param_getchar(Cmd, cmdp)) {
63 case 'h':
64 return -1;
65 case 'H':
66 hex = true;
67 //get hex
68 *fullcode = param_get32ex(Cmd, cmdp+1, 0, 10);
69 cmdp+=2;
70 break;
71 case 'D':
72 case 'd':
73 //param get string int param_getstr(const char *line, int paramnum, char * str)
74 stringlen = param_getstr(Cmd, cmdp+1, id, sizeof(id));
75 if (stringlen < 2) return -1;
76 cmdp+=2;
77 break;
78 case 'Q':
79 case 'q':
80 *Q5 = true;
81 cmdp++;
82 break;
83 default:
84 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
85 errors = 1;
86 break;
87 }
88 if(errors) break;
89 }
90 // No args
91 if(cmdp == 0) errors = 1;
92
93 //Validations
94 if(errors || (stringlen == 0 && !hex) ) return -1;
95
96 if (!hex) {
97 for (int index =0; index < strlen(id); ++index) {
98 // Get value from number string.
99 if ( id[index] == '*' ) val = 10;
100 if ( id[index] == '#') val = 11;
101 if ( id[index] >= 0x30 && id[index] <= 0x39 )
102 val = id[index] - 0x30;
103
104 *fullcode += val;
105
106 // last digit is only added, not multipled.
107 if ( index < strlen(id)-1 )
108 *fullcode *= 12;
109 }
110 }
111
112 *usercode = *fullcode & 0x0000FFFF; //% 65566
113 *sitecode = (*fullcode >> 24) & 0x000000FF; // /= 16777216;
114 return 0;
115 }
116
117 // calc not certain - intended to get bitstream for programming / sim
118 int GetPrescoBits(uint32_t fullcode, uint8_t *prescoBits) {
119 num_to_bytebits(0x10D00000, 32, prescoBits);
120 num_to_bytebits(0x00000000, 32, prescoBits+32);
121 num_to_bytebits(0x00000000, 32, prescoBits+64);
122 num_to_bytebits(fullcode , 32, prescoBits+96);
123 return 1;
124 }
125
126 //see ASKDemod for what args are accepted
127 int CmdPrescoDemod(const char *Cmd) {
128 if (!ASKDemod(Cmd, false, false, 1)) {
129 if (g_debugMode) PrintAndLog("ASKDemod failed");
130 return 0;
131 }
132 size_t size = DemodBufferLen;
133 //call lfdemod.c demod for presco
134 int ans = PrescoDemod(DemodBuffer, &size);
135 if (ans < 0) {
136 if (g_debugMode) PrintAndLog("Error Presco_Demod %d", ans);
137 return 0;
138 }
139 //got a good demod
140 uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans, 32);
141 uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
142 uint32_t raw3 = bytebits_to_byte(DemodBuffer+ans+64, 32);
143 uint32_t raw4 = bytebits_to_byte(DemodBuffer+ans+96, 32);
144 uint32_t cardid = raw4;
145 PrintAndLog("Presco Tag Found: Card ID %08X", cardid);
146 PrintAndLog("Raw: %08X%08X%08X%08X", raw1,raw2,raw3,raw4);
147 setDemodBuf(DemodBuffer, 128, ans);
148 setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
149
150 uint32_t sitecode = 0, usercode = 0, fullcode = 0;
151 bool Q5=false;
152 char cmd[12] = {0};
153 sprintf(cmd, "H %08X", cardid);
154 GetWiegandFromPresco(cmd, &sitecode, &usercode, &fullcode, &Q5);
155 PrintAndLog("SiteCode %u, UserCode %u, FullCode, %08X", sitecode, usercode, fullcode);
156
157 return 1;
158 }
159
160 //see ASKDemod for what args are accepted
161 int CmdPrescoRead(const char *Cmd) {
162 // Presco Number: 123456789 --> Sitecode 30 | usercode 8665
163
164 // read lf silently
165 lf_read(true, 10000);
166 // demod and output Presco ID
167 return CmdPrescoDemod(Cmd);
168 }
169
170 // takes base 12 ID converts to hex
171 // Or takes 8 digit hex ID
172 int CmdPrescoClone(const char *Cmd) {
173
174 bool Q5 = false;
175 uint32_t sitecode=0, usercode=0, fullcode=0;
176 uint32_t blocks[5] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_32 | 4<<T55x7_MAXBLOCK_SHIFT | T55x7_ST_TERMINATOR, 0, 0, 0, 5};
177
178 // get wiegand from printed number.
179 if (GetWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == -1) return usage_lf_presco_clone();
180
181 if (Q5)
182 blocks[0] = T5555_MODULATION_MANCHESTER | ((32-2)>>1)<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT | T5555_ST_TERMINATOR;
183
184 if ((sitecode & 0xFF) != sitecode) {
185 sitecode &= 0xFF;
186 PrintAndLog("Facility-Code Truncated to 8-bits (Presco): %u", sitecode);
187 }
188
189 if ((usercode & 0xFFFF) != usercode) {
190 usercode &= 0xFFFF;
191 PrintAndLog("Card Number Truncated to 16-bits (Presco): %u", usercode);
192 }
193
194 blocks[1] = 0x10D00000; //preamble
195 blocks[2] = 0x00000000;
196 blocks[3] = 0x00000000;
197 blocks[4] = fullcode;
198
199 PrintAndLog("Preparing to clone Presco to T55x7 with SiteCode: %u, UserCode: %u, FullCode: %08x", sitecode, usercode, fullcode);
200 PrintAndLog("Blk | Data ");
201 PrintAndLog("----+------------");
202 PrintAndLog(" 00 | 0x%08x", blocks[0]);
203 PrintAndLog(" 01 | 0x%08x", blocks[1]);
204 PrintAndLog(" 02 | 0x%08x", blocks[2]);
205 PrintAndLog(" 03 | 0x%08x", blocks[3]);
206 PrintAndLog(" 04 | 0x%08x", blocks[4]);
207
208 UsbCommand resp;
209 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
210
211 for (int i=4; i>=0; i--) {
212 c.arg[0] = blocks[i];
213 c.arg[1] = i;
214 clearCommandBuffer();
215 SendCommand(&c);
216 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
217 PrintAndLog("Error occurred, device did not respond during write operation.");
218 return -1;
219 }
220 }
221 return 0;
222 }
223
224 // takes base 12 ID converts to hex
225 // Or takes 8 digit hex ID
226 int CmdPrescoSim(const char *Cmd) {
227 uint32_t sitecode=0, usercode=0, fullcode=0;
228 bool Q5=false;
229 // get wiegand from printed number.
230 if (GetWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == -1) return usage_lf_presco_sim();
231
232 uint8_t clk = 32, encoding = 1, separator = 1, invert = 0;
233 uint16_t arg1, arg2;
234 size_t size = 128;
235 arg1 = clk << 8 | encoding;
236 arg2 = invert << 8 | separator;
237
238 PrintAndLog("Simulating Presco - SiteCode: %u, UserCode: %u, FullCode: %08X",sitecode, usercode, fullcode);
239
240 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
241 GetPrescoBits(fullcode, c.d.asBytes);
242 clearCommandBuffer();
243 SendCommand(&c);
244 return 0;
245 }
246
247 static command_t CommandTable[] = {
248 {"help", CmdHelp, 1, "This help"},
249 {"read", CmdPrescoRead, 0, "Attempt to read and Extract tag data"},
250 {"clone", CmdPrescoClone, 0, "d <9 digit ID> or h <hex> [Q5] clone presco tag"},
251 {"sim", CmdPrescoSim, 0, "d <9 digit ID> or h <hex> simulate presco tag"},
252 {NULL, NULL, 0, NULL}
253 };
254
255 int CmdLFPresco(const char *Cmd) {
256 clearCommandBuffer();
257 CmdsParse(CommandTable, Cmd);
258 return 0;
259 }
260
261 int CmdHelp(const char *Cmd) {
262 CmdsHelp(CommandTable);
263 return 0;
264 }
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