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proxmark3/client/src/cmdlfkeri.c
Philippe Teuwen 30aa7aa7d1 Adapting license headers, WIP
2022-01-08 00:40:52 +01:00

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//-----------------------------------------------------------------------------
// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// See LICENSE.txt for the text of the license.
//-----------------------------------------------------------------------------
// Low frequency KERI tag commands
// PSK1, RF/128, RF/2, 64 bits long
//-----------------------------------------------------------------------------
#include "cmdlfkeri.h"
#include <string.h>
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
#include "commonutil.h" // ARRAYLEN
#include "cmdparser.h" // command_t
#include "cliparser.h"
#include "comms.h"
#include "ui.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "protocols.h" // for T55xx config register definitions
#include "lfdemod.h" // preamble test
#include "cmdlft55xx.h" // verifywrite
#include "cmdlfem4x05.h" //
static int CmdHelp(const char *Cmd);
typedef enum {Scramble = 0, Descramble = 1} KeriMSScramble_t;
static int CmdKeriMSScramble(KeriMSScramble_t Action, uint32_t *FC, uint32_t *ID, uint32_t *CardID) {
// 255 = Not used/Unknown other values are the bit offset in the ID/FC values
const uint8_t CardToID [] = { 255, 255, 255, 255, 13, 12, 20, 5, 16, 6, 21, 17, 8, 255, 0, 7,
10, 15, 255, 11, 4, 1, 255, 18, 255, 19, 2, 14, 3, 9, 255, 255
};
const uint8_t CardToFC [] = { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 255, 255,
255, 255, 2, 255, 255, 255, 3, 255, 4, 255, 255, 255, 255, 255, 1, 255
};
uint8_t card_idx; // 0 - 31
if (Action == Descramble) {
*FC = 0;
*ID = 0;
for (card_idx = 0; card_idx < 32; card_idx++) {
// Get Bit State
bool BitState = (*CardID >> card_idx) & 1;
// Card ID
if (CardToID[card_idx] < 32) {
*ID = *ID | (BitState << CardToID[card_idx]);
}
// Card FC
if (CardToFC[card_idx] < 32) {
*FC = *FC | (BitState << CardToFC[card_idx]);
}
}
}
if (Action == Scramble) {
*CardID = 0; // set to 0
for (card_idx = 0; card_idx < 32; card_idx++) {
// Card ID
if (CardToID[card_idx] < 32) {
if ((*ID & (1U << CardToID[card_idx])) > 0)
*CardID |= (1U << card_idx);
}
// Card FC
if (CardToFC[card_idx] < 32) {
if ((*FC & (1U << CardToFC[card_idx])) > 0)
*CardID |= (1U << card_idx);
}
}
// Fixed bits and parity/check bits
/*
Add Parity and Fixed bits
Bit 3 - Note Used/Fixed 1 - TBC
Bit 31 - 1 Fixed Not in check/parity
Bit 0,1 - 2 Bit Parity
*/
*CardID |= (1 << 3);
// Check/Parity Bits
int parity = 1;
for (card_idx = 4; card_idx <= 31; card_idx += 2) {
parity ^= ((*CardID >> card_idx) & 11);
}
*CardID = *CardID | parity;
// Bit 31 was fixed but not in check/parity bits
*CardID |= 1UL << 31;
PrintAndLogEx(SUCCESS, "Scrambled MS - FC: " _GREEN_("%d") " Card: " _GREEN_("%d") ", Raw: E0000000%08X", *FC, *ID, *CardID);
}
return PM3_SUCCESS;
}
int demodKeri(bool verbose) {
(void) verbose; // unused so far
if (PSKDemod(0, 0, 100, false) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: PSK1 Demod failed");
return PM3_ESOFT;
}
bool invert = false;
size_t size = g_DemodBufferLen;
int idx = detectKeri(g_DemodBuffer, &size, &invert);
if (idx < 0) {
if (idx == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: too few bits found");
else if (idx == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: preamble not found");
else if (idx == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: Size not correct: 64 != %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: ans: %d", idx);
return PM3_ESOFT;
}
setDemodBuff(g_DemodBuffer, size, idx);
setClockGrid(g_DemodClock, g_DemodStartIdx + (idx * g_DemodClock));
/*
000000000000000000000000000001XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX111
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^1###############################^^^
Preamble block 29 bits of ZEROS
32 bit Internal ID (First bit always 1)
3 bit of 1s in the end
How this is decoded to Facility ID, Card number is unknown
Facility ID = 0-31 (indicates 5 bits)
Card number = up to 10 digits
Might be a hash of FC & CN to generate Internal ID
*/
/*
Descramble Data.
*/
uint32_t fc = 0;
uint32_t cardid = 0;
//got a good demod
uint32_t raw1 = bytebits_to_byte(g_DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(g_DemodBuffer + 32, 32);
if (invert) {
PrintAndLogEx(INFO, "Had to Invert - probably KERI");
for (size_t i = 0; i < size; i++)
g_DemodBuffer[i] ^= 1;
raw1 = bytebits_to_byte(g_DemodBuffer, 32);
raw2 = bytebits_to_byte(g_DemodBuffer + 32, 32);
CmdPrintDemodBuff("-x");
}
//get internal id
// uint32_t ID = bytebits_to_byte(g_DemodBuffer + 29, 32);
// Due to the 3 sync bits being at the start of the capture
// We can take the last 32bits as the internal ID.
uint32_t ID = raw2;
ID &= 0x7FFFFFFF;
PrintAndLogEx(SUCCESS, "KERI - Internal ID: " _GREEN_("%u") ", Raw: %08X%08X", ID, raw1, raw2);
// Just need to the low 32 bits without the 111 trailer
CmdKeriMSScramble(Descramble, &fc, &cardid, &raw2);
PrintAndLogEx(SUCCESS, "Descrambled MS - FC: " _GREEN_("%d") " Card: " _GREEN_("%d"), fc, cardid);
return PM3_SUCCESS;
}
static int CmdKeriDemod(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf keri demod",
"Try to find KERI preamble, if found decode / descramble data",
"lf keri demod"
);
void *argtable[] = {
arg_param_begin,
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
CLIParserFree(ctx);
return demodKeri(true);
}
static int CmdKeriReader(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf keri reader",
"read a keri tag",
"lf keri 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, 10000);
demodKeri(!cm);
} while (cm && !kbd_enter_pressed());
return PM3_SUCCESS;
}
static int CmdKeriClone(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf keri clone",
"clone a KERI tag to a T55x7, Q5/T5555 or EM4305/4469 tag",
"lf keri clone -t i --cn 12345 -> Internal ID\n"
"lf keri clone -t m --fc 6 --cn 12345 -> MS ID\n");
void *argtable[] = {
arg_param_begin,
arg_str0("t", "type", "<m|i>", "Type m - MS, i - Internal ID"),
arg_int0(NULL, "fc", "<dec>", "Facility Code"),
arg_int1(NULL, "cn", "<dec>", "KERI card ID"),
arg_lit0(NULL, "q5", "specify writing to Q5/T5555 tag"),
arg_lit0(NULL, "em", "specify writing to EM4305/4469 tag"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint8_t keritype[2] = {'i'}; // default to internalid
int typeLen = sizeof(keritype);
CLIGetStrWithReturn(ctx, 1, keritype, &typeLen);
uint32_t fc = arg_get_int_def(ctx, 2, 0);
uint32_t cid = arg_get_int_def(ctx, 3, 0);
bool q5 = arg_get_lit(ctx, 4);
bool em = arg_get_lit(ctx, 5);
CLIParserFree(ctx);
if (q5 && em) {
PrintAndLogEx(FAILED, "Can't specify both Q5 and EM4305 at the same time");
return PM3_EINVARG;
}
// Setup card data/build internal id
uint32_t internalid = 0;
switch (keritype[0]) {
case 'i' : // Internal ID
// MSB is ONE
internalid = cid | 0x80000000;
break;
case 'm' : // MS
CmdKeriMSScramble(Scramble, &fc, &cid, &internalid);
break;
default :
PrintAndLogEx(ERR, "Invalid type");
return PM3_EINVARG;
}
uint32_t blocks[3];
blocks[0] = T55x7_TESTMODE_DISABLED | T55x7_X_MODE | T55x7_MODULATION_PSK1 | T55x7_PSKCF_RF_2 | 2 << T55x7_MAXBLOCK_SHIFT;
// dynamic bitrate used
blocks[0] |= 0xF << 18;
char cardtype[16] = {"T55x7"};
if (q5) {
blocks[0] = T5555_FIXED | T5555_MODULATION_PSK1 | T5555_SET_BITRATE(32) | T5555_PSK_RF_2 | 2 << T5555_MAXBLOCK_SHIFT;
snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
}
if (em) {
blocks[0] = EM4305_KERI_CONFIG_BLOCK;
snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
}
// Prepare and write to card
// 3 LSB is ONE
uint64_t data = ((uint64_t)internalid << 3) + 7;
PrintAndLogEx(INFO, "Preparing to clone KERI to " _YELLOW_("%s") " with Internal Id " _YELLOW_("%" PRIx32), cardtype, internalid);
blocks[1] = data >> 32;
blocks[2] = data & 0xFFFFFFFF;
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 keri read`") " to verify");
return res;
}
static int CmdKeriSim(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf keri sim",
"Enables simulation of KERI card with internal ID.\n"
"You supply a KERI card id and it will converted to a KERI internal ID.",
"lf keri sim --cn 112233"
);
void *argtable[] = {
arg_param_begin,
arg_u64_1(NULL, "id", "<dec>", "KERI card ID"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint64_t internalid = arg_get_u64_def(ctx, 1, 0);
CLIParserFree(ctx);
internalid |= 0x80000000;
internalid <<= 3;
internalid += 7;
uint8_t bs[64] = {0x00};
// loop to bits
uint8_t j = 0;
for (int8_t i = 63; i >= 0; --i) {
bs[j++] = ((internalid >> i) & 1);
}
PrintAndLogEx(SUCCESS, "Simulating KERI - Internal Id " _YELLOW_("%" PRIu64), internalid);
lf_psksim_t *payload = calloc(1, sizeof(lf_psksim_t) + sizeof(bs));
payload->carrier = 2;
payload->invert = 0;
payload->clock = 32;
memcpy(payload->data, bs, sizeof(bs));
clearCommandBuffer();
SendCommandNG(CMD_LF_PSK_SIMULATE, (uint8_t *)payload, sizeof(lf_psksim_t) + sizeof(bs));
free(payload);
PacketResponseNG resp;
WaitForResponse(CMD_LF_PSK_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", CmdKeriDemod, AlwaysAvailable, "demodulate an KERI tag from the GraphBuffer"},
{"reader", CmdKeriReader, IfPm3Lf, "attempt to read and extract tag data"},
{"clone", CmdKeriClone, IfPm3Lf, "clone KERI tag to T55x7 or Q5/T5555"},
{"sim", CmdKeriSim, IfPm3Lf, "simulate KERI 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 CmdLFKeri(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
// find KERI preamble in already demoded data
int detectKeri(uint8_t *dest, size_t *size, bool *invert) {
uint8_t preamble[] = {1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
// sanity check.
if (*size < sizeof(preamble)) return -1;
size_t startIdx = 0;
size_t found_size = *size;
if (!preambleSearch(dest, preamble, sizeof(preamble), &found_size, &startIdx)) {
found_size = *size;
// if didn't find preamble try again inverting
uint8_t preamble_i[] = {0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
if (!preambleSearch(g_DemodBuffer, preamble_i, sizeof(preamble_i), &found_size, &startIdx))
return -2;
*invert ^= 1;
}
if (found_size < 64) return -3; //wrong demoded size
*size = found_size;
return (int)startIdx;
}
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