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proxmark3/client/src/cmdlfsecurakey.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 Securakey tag commands
// ASK/Manchester, RF/40, 96 bits long (unknown cs)
//-----------------------------------------------------------------------------
#include "cmdlfsecurakey.h"
#include <string.h> // memcpy
#include <ctype.h> // tolower
#include "commonutil.h" // ARRAYLEN
#include "cmdparser.h" // command_t
#include "comms.h"
#include "ui.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "lfdemod.h" // preamble test
#include "parity.h" // for wiegand parity test
#include "protocols.h" // t55xx defines
#include "cmdlft55xx.h" // clone..
#include "cliparser.h"
#include "cmdlfem4x05.h" // EM defines
static int CmdHelp(const char *Cmd);
//see ASKDemod for what args are accepted
int demodSecurakey(bool verbose) {
(void) verbose; // unused so far
//ASK / Manchester
bool st = false;
if (ASKDemod_ext(40, 0, 0, 0, false, false, false, 1, &st) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: ASK/Manchester Demod failed");
return PM3_ESOFT;
}
if (st)
return PM3_ESOFT;
size_t size = DemodBufferLen;
int ans = detectSecurakey(DemodBuffer, &size);
if (ans < 0) {
if (ans == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: too few bits found");
else if (ans == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: preamble not found");
else if (ans == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: Size not correct: %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: ans: %d", ans);
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);
// 26 bit format
// preamble ??bitlen reserved EPx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
// 0111111111 0 01011010 0 00000000 0 00000010 0 00110110 0 00111110 0 01100010 0 00001111 0 01100000 0 00000000 0 0000
// 32 bit format
// preamble ??bitlen reserved EPxxxxxxx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
// 0111111111 0 01100000 0 00000000 0 10000100 0 11001010 0 01011011 0 01010110 0 00010110 0 11100000 0 00000000 0 0000
// x = FC?
// y = card #
// standard wiegand parities.
// unknown checksum 11 bits? at the end
uint8_t bits_no_spacer[85];
memcpy(bits_no_spacer, DemodBuffer + 11, 85);
// remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
size = removeParity(bits_no_spacer, 0, 9, 3, 85);
if (size != 85 - 9) {
PrintAndLogEx(DEBUG, "DEBUG: Error removeParity: %zu", size);
return 0;
}
uint8_t bitLen = (uint8_t)bytebits_to_byte(bits_no_spacer + 2, 6);
uint32_t fc = 0, lWiegand = 0, rWiegand = 0;
if (bitLen > 40) { //securakey's max bitlen is 40 bits...
PrintAndLogEx(DEBUG, "DEBUG: Error bitLen too long: %u", bitLen);
return PM3_ESOFT;
}
// get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
lWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen, bitLen / 2);
rWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen + bitLen / 2, bitLen / 2);
// get FC
fc = bytebits_to_byte(bits_no_spacer + 49 - bitLen, bitLen - 2 - 16);
// test bitLen
if (bitLen != 26 && bitLen != 32)
PrintAndLogEx(NORMAL, "***unknown securakey bitLen - share with forum***");
uint32_t cardid = bytebits_to_byte(bits_no_spacer + 8 + 23, 16);
// test parities - evenparity32 looks to add an even parity returns 0 if already even...
bool parity = !evenparity32(lWiegand) && !oddparity32(rWiegand);
PrintAndLogEx(SUCCESS, "Securakey - len: " _GREEN_("%u") " FC: " _GREEN_("0x%X")" Card: " _GREEN_("%u") ", Raw: %08X%08X%08X", bitLen, fc, cardid, raw1, raw2, raw3);
if (bitLen <= 32)
PrintAndLogEx(SUCCESS, "Wiegand: " _GREEN_("%08X") " parity (%s)", (lWiegand << (bitLen / 2)) | rWiegand, parity ? _GREEN_("ok") : _RED_("fail"));
if (verbose) {
PrintAndLogEx(INFO, "\nHow the FC translates to printed FC is unknown");
PrintAndLogEx(INFO, "How the checksum is calculated is unknown");
PrintAndLogEx(INFO, "Help the community identify this format further\nby sharing your tag on the pm3 forum or discord");
}
return PM3_SUCCESS;
}
static int CmdSecurakeyDemod(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf securakey demod",
"Try to find Securakey preamble, if found decode / descramble data",
"lf securakey demod"
);
void *argtable[] = {
arg_param_begin,
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
CLIParserFree(ctx);
return demodSecurakey(true);
}
static int CmdSecurakeyReader(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf securakey reader",
"read a Securakey tag",
"lf securakey 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, 8000);
demodSecurakey(!cm);
} while (cm && !kbd_enter_pressed());
return PM3_SUCCESS;
}
static int CmdSecurakeyClone(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf securakey clone",
"clone a Securakey tag to a T55x7, Q5/T5555 or EM4305/4469 tag.",
"lf securakey clone --raw 7FCB400001ADEA5344300000\n"
"lf securakey clone --q5 --raw 7FCB400001ADEA5344300000 -> encode for Q5/T5555 tag\n"
"lf securakey clone --em --raw 7FCB400001ADEA5344300000 -> encode for EM4305/4469"
);
void *argtable[] = {
arg_param_begin,
arg_str1("r", "raw", "<hex>", "raw hex data. 12 bytes"),
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);
int raw_len = 0;
// skip first block, 3*4 = 12 bytes left
uint8_t raw[12] = {0};
CLIGetHexWithReturn(ctx, 1, raw, &raw_len);
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;
}
if (raw_len != 12) {
PrintAndLogEx(ERR, "Data must be 12 bytes (24 HEX characters) %d", raw_len);
return PM3_EINVARG;
}
uint32_t blocks[4];
for (uint8_t i = 1; i < ARRAYLEN(blocks); i++) {
blocks[i] = bytes_to_num(raw + ((i - 1) * 4), sizeof(uint32_t));
}
//Securakey - compat mode, ASK/Man, data rate 40, 3 data blocks
blocks[0] = T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_40 | 3 << T55x7_MAXBLOCK_SHIFT;
char cardtype[16] = {"T55x7"};
// Q5
if (q5) {
blocks[0] = T5555_FIXED | T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(40) | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
}
// EM4305
if (em) {
blocks[0] = EM4305_SECURAKEY_CONFIG_BLOCK;
snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
}
PrintAndLogEx(INFO, "Preparing to clone Securakey to " _YELLOW_("%s") " with raw hex", cardtype);
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 securakey reader`") " to verify");
return res;
}
static int CmdSecurakeySim(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf securakey sim",
"Enables simulation of secura card with specified card number.\n"
"Simulation runs until the button is pressed or another USB command is issued.",
"lf securakey sim --raw 7FCB400001ADEA5344300000"
);
void *argtable[] = {
arg_param_begin,
arg_str0("r", "raw", "<hex>", " raw hex data. 12 bytes"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
int raw_len = 0;
// skip first block, 3*4 = 12 bytes left
uint8_t raw[12] = {0};
CLIGetHexWithReturn(ctx, 1, raw, &raw_len);
CLIParserFree(ctx);
if (raw_len != 12) {
PrintAndLogEx(ERR, "Data must be 12 bytes (24 HEX characters) %d", raw_len);
return PM3_EINVARG;
}
PrintAndLogEx(SUCCESS, "Simulating SecuraKey - raw " _YELLOW_("%s"), sprint_hex_inrow(raw, sizeof(raw)));
uint8_t bs[sizeof(raw) * 8];
bytes_to_bytebits(raw, sizeof(raw), bs);
lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + sizeof(bs));
payload->encoding = 1;
payload->invert = 0;
payload->separator = 0;
payload->clock = 40;
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", CmdSecurakeyDemod, AlwaysAvailable, "Demodulate an Securakey tag from the GraphBuffer"},
{"reader", CmdSecurakeyReader, IfPm3Lf, "Attempt to read and extract tag data from the antenna"},
{"clone", CmdSecurakeyClone, IfPm3Lf, "clone Securakey tag to T55x7"},
{"sim", CmdSecurakeySim, IfPm3Lf, "simulate Securakey 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 CmdLFSecurakey(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
// by marshmellow
// find Securakey preamble in already demoded data
int detectSecurakey(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, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1};
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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