proxmark3/client/cmdlfkeri.c

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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 KERI tag commands
// PSK1, RF/128, RF/2, 64 bits long
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//-----------------------------------------------------------------------------
#include "cmdlfkeri.h"
#include <string.h>
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
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#include "commonutil.h" // ARRAYLEN
#include "cmdparser.h" // command_t
#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
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static int CmdHelp(const char *Cmd);
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static int usage_lf_keri_clone(void) {
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PrintAndLogEx(NORMAL, "clone a KERI tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "Usage: lf keri clone [h] <id> <Q5>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " <id> : Keri Internal ID");
PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf keri clone 112233");
return PM3_SUCCESS;
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}
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static int usage_lf_keri_sim(void) {
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PrintAndLogEx(NORMAL, "Enables simulation of KERI card with specified card number.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf keri sim [h] <id>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " <id> : Keri Internal ID");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf keri sim 112233");
return PM3_SUCCESS;
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}
static int CmdKeriDemod(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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if (PSKDemod("", false) != PM3_SUCCESS) {
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PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: PSK1 Demod failed");
return PM3_ESOFT;
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}
bool invert = false;
size_t size = DemodBufferLen;
int idx = detectKeri(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)
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PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: Size not correct: 64 != %zu", size);
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else
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: ans: %d", idx);
return PM3_ESOFT;
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}
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setDemodBuff(DemodBuffer, size, idx);
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setClockGrid(g_DemodClock, g_DemodStartIdx + (idx * g_DemodClock));
//got a good demod
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uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
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//get internal id
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uint32_t ID = bytebits_to_byte(DemodBuffer + 29, 32);
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ID &= 0x7FFFFFFF;
/*
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
*/
PrintAndLogEx(SUCCESS, "KERI Tag Found -- Internal ID: %u", ID);
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PrintAndLogEx(SUCCESS, "Raw: %08X%08X", raw1, raw2);
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if (invert) {
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PrintAndLogEx(INFO, "Had to Invert - probably KERI");
for (size_t i = 0; i < size; i++)
DemodBuffer[i] ^= 1;
CmdPrintDemodBuff("x");
}
return PM3_SUCCESS;
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}
static int CmdKeriRead(const char *Cmd) {
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lf_read(true, 10000);
return CmdKeriDemod(Cmd);
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}
static int CmdKeriClone(const char *Cmd) {
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uint32_t internalid = 0;
uint32_t blocks[3] = {
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T55x7_TESTMODE_DISABLED |
T55x7_X_MODE |
T55x7_MODULATION_PSK1 |
T55x7_PSKCF_RF_2 |
2 << T55x7_MAXBLOCK_SHIFT,
0,
0
};
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// dynamic bitrate used
blocks[0] |= 0xF << 18;
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char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_keri_clone();
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internalid = param_get32ex(Cmd, 0, 0, 10);
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//Q5
if (tolower(param_getchar(Cmd, 1)) == 'q') {
blocks[0] =
T5555_MODULATION_PSK1 |
T5555_SET_BITRATE(128) |
T5555_PSK_RF_2 |
2 << T5555_MAXBLOCK_SHIFT;
}
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// MSB is ONE
internalid |= 0x80000000;
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// 3 LSB is ONE
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uint64_t data = ((uint64_t)internalid << 3) + 7;
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PrintAndLogEx(INFO, "Preparing to clone KERI to T55x7 with Internal Id: %" PRIx32, internalid);
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blocks[1] = data >> 32;
blocks[2] = data & 0xFFFFFFFF;
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print_blocks(blocks, ARRAYLEN(blocks));
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return clone_t55xx_tag(blocks, ARRAYLEN(blocks));
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}
static int CmdKeriSim(const char *Cmd) {
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char cmdp = tolower(param_getchar(Cmd, 0));
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if (strlen(Cmd) == 0 || cmdp == 'h')
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return usage_lf_keri_sim();
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uint64_t internalid = param_get32ex(Cmd, 0, 0, 10);
internalid |= 0x80000000;
internalid <<= 3;
internalid += 7;
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uint8_t bs[64] = {0x00};
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// loop to bits
uint8_t j = 0;
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for (int8_t i = 63; i >= 0; --i) {
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bs[j++] = ((internalid >> i) & 1);
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}
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PrintAndLogEx(SUCCESS, "Simulating KERI - Internal Id: %" PRIu64, internalid);
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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));
PrintAndLogEx(INFO, "Simulating");
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clearCommandBuffer();
SendCommandNG(CMD_LF_PSK_SIMULATE, (uint8_t *)payload, sizeof(lf_psksim_t) + sizeof(bs));
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free(payload);
PacketResponseNG resp;
WaitForResponse(CMD_LF_PSK_SIMULATE, &resp);
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PrintAndLogEx(INFO, "Done");
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if (resp.status != PM3_EOPABORTED)
return resp.status;
return PM3_SUCCESS;
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}
static command_t CommandTable[] = {
{"help", CmdHelp, AlwaysAvailable, "This help"},
{"demod", CmdKeriDemod, AlwaysAvailable, "Demodulate an KERI tag from the GraphBuffer"},
{"read", CmdKeriRead, IfPm3Lf, "Attempt to read and extract tag data from the antenna"},
{"clone", CmdKeriClone, IfPm3Lf, "clone KERI to T55x7"},
{"sim", CmdKeriSim, IfPm3Lf, "simulate KERI tag"},
{NULL, NULL, NULL, NULL}
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};
static int CmdHelp(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
CmdsHelp(CommandTable);
return PM3_SUCCESS;
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}
int CmdLFKeri(const char *Cmd) {
clearCommandBuffer();
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return CmdsParse(CommandTable, Cmd);
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}
// 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) + 100) return -1;
size_t startIdx = 0;
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx)) {
// if didn't find preamble try again inverting
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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(DemodBuffer, preamble_i, sizeof(preamble_i), size, &startIdx))
return -2;
*invert ^= 1;
}
if (*size != 64) return -3; //wrong demoded size
return (int)startIdx;
}
int demodKeri(void) {
return CmdKeriDemod("");
}