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proxmark3/client/cmdlfkeri.c
iceman1001 5acd681f8f cppchecker - too many shifts
2020-03-24 13:11:50 +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 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 "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
static int CmdHelp(const char *Cmd);
static int usage_lf_keri_clone(void) {
PrintAndLogEx(NORMAL, "clone a KERI tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "Usage: lf keri clone [h] <id> <Q5>");
PrintAndLogEx(NORMAL, "Usage extended: lf keri clone [h] t <m|i> [f <fc>] c <cardid> [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)");
// New format
PrintAndLogEx(NORMAL, " <t> [m|i] : Type. m - MS, i - Internal ID");
PrintAndLogEx(NORMAL, " <f> <fc> : Facility Code");
PrintAndLogEx(NORMAL, " <c> <cn> : Card Number");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf keri clone 112233");
PrintAndLogEx(NORMAL, " lf keri clone type ms fc 6 cn 12345");
PrintAndLogEx(NORMAL, " lf keri clone t m f 6 c 12345");
return PM3_SUCCESS;
}
static int usage_lf_keri_sim(void) {
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;
}
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
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 };
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 CardIdx; // 0 - 31
bool BitState;
if (Action == Descramble) {
*FC = 0;
*ID = 0;
for (CardIdx = 0; CardIdx < 32; CardIdx++) {
// Get Bit State
BitState = (*CardID >> CardIdx) & 1;
// Card ID
if (CardToID[CardIdx] < 32) {
*ID = *ID | (BitState << CardToID[CardIdx]);
}
// Card FC
if (CardToFC[CardIdx] < 32) {
*FC = *FC | (BitState << CardToFC[CardIdx]);
}
}
}
if (Action == Scramble)
{
*CardID = 0; // set to 0
for (CardIdx = 0; CardIdx < 32; CardIdx++)
{
// Card ID
if (CardToID[CardIdx] < 32) {
if ((*ID & (1 << CardToID[CardIdx])) > 0)
*CardID |= (1 << CardIdx);
}
// Card FC
if (CardToFC[CardIdx] < 32) {
if ((*FC & (1 << CardToFC[CardIdx])) > 0)
*CardID |= (1 << CardIdx);
}
}
// 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 (CardIdx = 4; CardIdx <= 31; CardIdx += 2) {
Parity = Parity ^ ((*CardID >> CardIdx) & 11);
}
*CardID = *CardID | Parity;
// Bit 31 was fixed but not in check/parity bits
*CardID |= 1UL << 31;
PrintAndLogEx(SUCCESS, "Scrambled MS : FC %d - CN %d to RAW : E0000000%08X",*FC,*ID,*CardID);
}
return PM3_SUCCESS;
}
static int CmdKeriDemod(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
if (PSKDemod("", false) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: PSK1 Demod failed");
return PM3_ESOFT;
}
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)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: Size not correct: 64 != %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: ans: %d", idx);
return PM3_ESOFT;
}
setDemodBuff(DemodBuffer, size, idx);
setClockGrid(g_DemodClock, g_DemodStartIdx + (idx * g_DemodClock));
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
//get internal id
// uint32_t ID = bytebits_to_byte(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;
/*
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);
PrintAndLogEx(SUCCESS, "Raw: %08X%08X", raw1, raw2);
/*
Descramble Data.
*/
uint32_t fc = 0;
uint32_t cardid = 0;
// Just need to the low 32 bits without the 111 trailer
CmdKeriMSScramble (Descramble,&fc,&cardid,&raw2);
PrintAndLogEx (SUCCESS,"Descrambled MS : FC %d - CN %d\n",fc,cardid);
if (invert) {
PrintAndLogEx(INFO, "Had to Invert - probably KERI");
for (size_t i = 0; i < size; i++)
DemodBuffer[i] ^= 1;
CmdPrintDemodBuff("x");
}
return PM3_SUCCESS;
}
static int CmdKeriRead(const char *Cmd) {
lf_read(false, 10000);
return CmdKeriDemod(Cmd);
}
static int CmdKeriClone(const char *Cmd) {
uint8_t cmdidx = 0;
char keritype = 'i'; // default to internalid
uint32_t fc = 0;
uint32_t cid = 0;
uint32_t internalid = 0;
uint32_t blocks[3] = {
T55x7_TESTMODE_DISABLED |
T55x7_X_MODE |
T55x7_MODULATION_PSK1 |
T55x7_PSKCF_RF_2 |
2 << T55x7_MAXBLOCK_SHIFT,
0,
0
};
// dynamic bitrate used
blocks[0] |= 0xF << 18;
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_keri_clone();
// Assume old format for backwards compatibility and only parameter is the internal id
cid = param_get32ex(Cmd, 0, 0, 10);
// find other options
while (param_getchar(Cmd, cmdidx) != 0x00) { // && !errors) {
switch (tolower(param_getchar(Cmd, cmdidx))) {
case 'h': // help
return usage_lf_keri_clone();
case 't': // format type
keritype = tolower(param_getchar(Cmd,cmdidx+1));
cmdidx += 2;
break;
case 'f': // fc
fc = param_get32ex(Cmd,cmdidx+1,0,10);
cmdidx += 2;
break;
case 'c': // cardid
cid = param_get32ex(Cmd,cmdidx+1,0,10);
cmdidx += 2;
break;
case 'q': // q5
blocks[0] =
T5555_MODULATION_PSK1 |
T5555_SET_BITRATE(128) |
T5555_PSK_RF_2 |
2 << T5555_MAXBLOCK_SHIFT;
cmdidx++;
break;
default:
// Skip unknown
cmdidx++;
}
}
// this is managed in above code
// internalid = param_get32ex(Cmd, 0, 0, 10);
/*
// Q5 is caught in the while loop
//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;
}
*/
// Setup card data/build internal id
switch (keritype) {
case 'i' : // Internal ID
// MSB is ONE
internalid = cid | 0x80000000;
break;
case 'm' : // MS
CmdKeriMSScramble (Scramble,&fc,&cid,&internalid);
break;
}
// Prepare and write to card
// 3 LSB is ONE
uint64_t data = ((uint64_t)internalid << 3) + 7;
PrintAndLogEx(INFO, "Preparing to clone KERI to T55x7 with Internal Id: %" PRIx32, internalid);
blocks[1] = data >> 32;
blocks[2] = data & 0xFFFFFFFF;
print_blocks(blocks, ARRAYLEN(blocks));
int 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) {
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h')
return usage_lf_keri_sim();
uint64_t internalid = param_get32ex(Cmd, 0, 0, 10);
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: %" 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));
PrintAndLogEx(INFO, "Simulating");
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"},
{"read", CmdKeriRead, IfPm3Lf, "Attempt to read and extract tag data from the antenna"},
{"clone", CmdKeriClone, IfPm3Lf, "clone KERI tag to T55x7 (or to 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) + 100) return -1;
size_t startIdx = 0;
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx)) {
// 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(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("");
}
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