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proxmark3/client/src/cmdlfvisa2000.c
iceman1001 ae853ede79 reader - textual
2020-12-01 11:26:54 +01:00

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//-----------------------------------------------------------------------------
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Low frequency visa 2000 tag commands
// by iceman
// ASK/Manchester, RF/64, STT, 96 bits (complete)
//-----------------------------------------------------------------------------
#include "cmdlfvisa2000.h"
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdio.h>
#include "commonutil.h" // ARRAYLEN
#include "common.h"
#include "cmdparser.h" // command_t
#include "comms.h"
#include "ui.h"
#include "graph.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "protocols.h" // for T55xx config register definitions
#include "lfdemod.h" // parityTest
#include "cmdlft55xx.h" // write verify
#include "cmdlfem4x05.h" //
#include "cliparser.h"
#ifndef VISA2k_BL0CK1
#define VISA2k_BL0CK1 0x56495332
#endif
static int CmdHelp(const char *Cmd);
static uint8_t visa_chksum(uint32_t id) {
uint8_t sum = 0;
for (uint8_t i = 0; i < 32; i += 4)
sum ^= (id >> i) & 0xF;
return sum & 0xF;
}
static uint8_t visa_parity(uint32_t id) {
// 4bit parity LUT
uint8_t par_lut[] = {
0, 1, 1, 0
, 1, 0, 0, 1
, 1, 0, 0, 1
, 0, 1, 1, 0
};
uint8_t par = 0;
par |= par_lut[(id >> 28) & 0xF ] << 7;
par |= par_lut[(id >> 24) & 0xF ] << 6;
par |= par_lut[(id >> 20) & 0xF ] << 5;
par |= par_lut[(id >> 16) & 0xF ] << 4;
par |= par_lut[(id >> 12) & 0xF ] << 3;
par |= par_lut[(id >> 8) & 0xF ] << 2;
par |= par_lut[(id >> 4) & 0xF ] << 1;
par |= par_lut[(id & 0xF) ];
return par;
}
/**
*
* 56495332 00096ebd 00000077 —> tag id 618173
* aaaaaaaa iiiiiiii -----ppc
*
* a = fixed value ascii 'VIS2'
* i = card id
* p = even parity bit for each nibble in card id.
* c = checksum (xor of card id)
*
**/
//see ASKDemod for what args are accepted
int demodVisa2k(bool verbose) {
(void) verbose; // unused so far
save_restoreGB(GRAPH_SAVE);
//CmdAskEdgeDetect("");
//ASK / Manchester
bool st = true;
if (ASKDemod_ext(64, 0, 0, 0, false, false, false, 1, &st) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
save_restoreGB(GRAPH_RESTORE);
return PM3_ESOFT;
}
size_t size = DemodBufferLen;
int ans = detectVisa2k(DemodBuffer, &size);
if (ans < 0) {
if (ans == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: too few bits found");
else if (ans == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: preamble not found");
else if (ans == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: Size not correct: %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: ans: %d", ans);
save_restoreGB(GRAPH_RESTORE);
return PM3_ESOFT;
}
setDemodBuff(DemodBuffer, 96, ans);
setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
uint32_t raw3 = bytebits_to_byte(DemodBuffer + 64, 32);
// chksum
uint8_t calc = visa_chksum(raw2);
uint8_t chk = raw3 & 0xF;
// test checksums
if (chk != calc) {
PrintAndLogEx(DEBUG, "DEBUG: error: Visa2000 checksum (%s) %x - %x\n", _RED_("fail"), chk, calc);
save_restoreGB(GRAPH_RESTORE);
return PM3_ESOFT;
}
// parity
uint8_t calc_par = visa_parity(raw2);
uint8_t chk_par = (raw3 & 0xFF0) >> 4;
if (calc_par != chk_par) {
PrintAndLogEx(DEBUG, "DEBUG: error: Visa2000 parity (%s) %x - %x\n", _RED_("fail"), chk_par, calc_par);
save_restoreGB(GRAPH_RESTORE);
return PM3_ESOFT;
}
PrintAndLogEx(SUCCESS, "Visa2000 - Card " _GREEN_("%u") ", Raw: %08X%08X%08X", raw2, raw1, raw2, raw3);
return PM3_SUCCESS;
}
static int CmdVisa2kDemod(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf visa2000 demod",
"Try to find visa2000 preamble, if found decode / descramble data",
"lf visa2000 demod"
);
void *argtable[] = {
arg_param_begin,
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
CLIParserFree(ctx);
return demodVisa2k(true);
}
// 64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
static int CmdVisa2kReader(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf visa2000 reader",
"read a visa2000 tag",
"lf visa2000 reader -@ -> continuous reader mode"
);
void *argtable[] = {
arg_param_begin,
arg_lit0("@", NULL, "optional - continuous reader mode"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
bool cm = arg_get_lit(ctx, 1);
CLIParserFree(ctx);
if (cm) {
PrintAndLogEx(INFO, "Press " _GREEN_("<Enter>") " to exit");
}
do {
lf_read(false, 20000);
demodVisa2k(!cm);
} while (cm && !kbd_enter_pressed());
return PM3_SUCCESS;
}
static int CmdVisa2kClone(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf visa2000 clone",
"clone a Visa2000 tag to a T55x7, Q5/T5555 or EM4305/4469 tag.",
"lf visa2000 clone --cn 112233\n"
"lf visa2000 clone --cn 112233 --q5 -> encode for Q5/T5555 tag\n"
"lf visa2000 clone --cn 112233 --em -> encode for EM4305/4469"
);
void *argtable[] = {
arg_param_begin,
arg_u64_1(NULL, "cn", "<dec>", "Visa2k card ID"),
arg_lit0(NULL, "q5", "optional - specify writing to Q5/T5555 tag"),
arg_lit0(NULL, "em", "optional - specify writing to EM4305/4469 tag"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint32_t id = arg_get_u32_def(ctx, 1, 0);
bool q5 = arg_get_lit(ctx, 2);
bool em = arg_get_lit(ctx, 3);
CLIParserFree(ctx);
if (q5 && em) {
PrintAndLogEx(FAILED, "Can't specify both Q5 and EM4305 at the same time");
return PM3_EINVARG;
}
uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, VISA2k_BL0CK1, 0};
char cardtype[16] = {"T55x7"};
// Q5
if (q5) {
blocks[0] = T5555_FIXED | T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(64) | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
}
// EM4305
if (em) {
blocks[0] = EM4305_VISA2000_CONFIG_BLOCK;
snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
}
blocks[2] = id;
blocks[3] = (visa_parity(id) << 4) | visa_chksum(id);
PrintAndLogEx(INFO, "Preparing to clone Visa2000 to " _YELLOW_("%s") " with CardId: " _GREEN_("%"PRIu32), cardtype, id);
print_blocks(blocks, ARRAYLEN(blocks));
int res;
if (em) {
res = em4x05_clone_tag(blocks, ARRAYLEN(blocks), 0, false);
} else {
res = clone_t55xx_tag(blocks, ARRAYLEN(blocks));
}
PrintAndLogEx(SUCCESS, "Done");
PrintAndLogEx(HINT, "Hint: try " _YELLOW_("`lf visa2000 reader`") " to verify");
return res;
}
static int CmdVisa2kSim(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf visa2000 sim",
"Enables simulation of visa2k card with specified card number.\n"
"Simulation runs until the button is pressed or another USB command is issued.\n",
"lf visa2000 sim --cn 1337"
);
void *argtable[] = {
arg_param_begin,
arg_u64_1(NULL, "cn", "<dec>", "Visa2k card ID"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint32_t id = arg_get_u32_def(ctx, 1, 0);
CLIParserFree(ctx);
PrintAndLogEx(SUCCESS, "Simulating Visa2000 - CardId:" _YELLOW_("%u"), id);
uint32_t blocks[3] = { VISA2k_BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
uint8_t bs[96];
for (int i = 0; i < 3; ++i)
num_to_bytebits(blocks[i], 32, bs + i * 32);
lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + sizeof(bs));
payload->encoding = 1;
payload->invert = 0;
payload->separator = 1;
payload->clock = 64;
memcpy(payload->data, bs, sizeof(bs));
clearCommandBuffer();
SendCommandNG(CMD_LF_ASK_SIMULATE, (uint8_t *)payload, sizeof(lf_asksim_t) + sizeof(bs));
free(payload);
PacketResponseNG resp;
WaitForResponse(CMD_LF_ASK_SIMULATE, &resp);
PrintAndLogEx(INFO, "Done");
if (resp.status != PM3_EOPABORTED)
return resp.status;
return PM3_SUCCESS;
}
static command_t CommandTable[] = {
{"help", CmdHelp, AlwaysAvailable, "This help"},
{"demod", CmdVisa2kDemod, AlwaysAvailable, "demodulate an VISA2000 tag from the GraphBuffer"},
{"reader", CmdVisa2kReader, IfPm3Lf, "attempt to read and extract tag data from the antenna"},
{"clone", CmdVisa2kClone, IfPm3Lf, "clone Visa2000 tag to T55x7 or Q5/T5555"},
{"sim", CmdVisa2kSim, IfPm3Lf, "simulate Visa2000 tag"},
{NULL, NULL, NULL, NULL}
};
static int CmdHelp(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
CmdsHelp(CommandTable);
return PM3_SUCCESS;
}
int CmdLFVisa2k(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
// by iceman
// find Visa2000 preamble in already demoded data
int detectVisa2k(uint8_t *dest, size_t *size) {
if (*size < 96) return -1; //make sure buffer has data
size_t startIdx = 0;
uint8_t preamble[] = {0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0};
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
return -2; //preamble not found
if (*size != 96) return -3; //wrong demoded size
//return start position
return (int)startIdx;
}
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