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CHG: 'hf 14a antifuzz' - original implementation by @asfabw, reworked a bit - WORK IN PROGRESS -

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This commit is contained in:
iceman1001 2019-01-07 09:32:16 +01:00
commit 3ae871f534
3 changed files with 92 additions and 85 deletions
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146
armsrc/iso14443a.c
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@ -14,7 +14,10 @@
#define MAX_ISO14A_TIMEOUT 524288
static uint32_t iso14a_timeout;
uint8_t colpos = 0;
int rsamples = 0;
//int ReqCount;
//char CollisionIndicators[10*8];
uint8_t trigger = 0;
// the block number for the ISO14443-4 PCB
@ -103,6 +106,8 @@ static uint32_t LastProxToAirDuration;
// Sequence D: 11110000 modulation with subcarrier during first half
// Sequence E: 00001111 modulation with subcarrier during second half
// Sequence F: 00000000 no modulation with subcarrier
// Sequence COLL: 11111111 load modulation over the full bitlenght.
// Tricks the reader to think that multiple cards answer (at least one card with 1 and at least one card with 0).
// READER TO CARD - miller
// Sequence X: 00001100 drop after half a period
// Sequence Y: 00000000 no drop
@ -110,6 +115,7 @@ static uint32_t LastProxToAirDuration;
#define SEC_D 0xf0
#define SEC_E 0x0f
#define SEC_F 0x00
#define SEC_COLL 0xff
#define SEC_X 0x0c
#define SEC_Y 0x00
#define SEC_Z 0xc0
@ -643,7 +649,9 @@ void RAMFUNC SniffIso14443a(uint8_t param) {
//-----------------------------------------------------------------------------
// Prepare tag messages
//-----------------------------------------------------------------------------
static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity) {
static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity, bool collision) {
uint8_t localCol = 0;
ToSendReset();
// Correction bit, might be removed when not needed
@ -651,7 +659,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *par
ToSendStuffBit(0);
ToSendStuffBit(0);
ToSendStuffBit(0);
ToSendStuffBit(1); // 1
ToSendStuffBit(1); // <-----
ToSendStuffBit(0);
ToSendStuffBit(0);
ToSendStuffBit(0);
@ -665,12 +673,15 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *par
// Data bits
for(uint16_t j = 0; j < 8; j++) {
if(b & 1) {
if (collision && (localCol >= colpos)){
ToSend[++ToSendMax] = SEC_COLL;
} else if(b & 1) {
ToSend[++ToSendMax] = SEC_D;
} else {
ToSend[++ToSendMax] = SEC_E;
}
b >>= 1;
localCol++;
}
// Get the parity bit
@ -690,10 +701,13 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *par
ToSendMax++;
}
static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len) {
static void CodeIso14443aAsTagEx(const uint8_t *cmd, uint16_t len, bool collision) {
uint8_t par[MAX_PARITY_SIZE] = {0};
GetParity(cmd, len, par);
CodeIso14443aAsTagPar(cmd, len, par);
CodeIso14443aAsTagPar(cmd, len, par, collision);
}
static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len) {
CodeIso14443aAsTagEx(cmd, len, false);
}
static void Code4bitAnswerAsTag(uint8_t cmd) {
@ -1680,9 +1694,11 @@ int EmSend4bit(uint8_t resp){
par);
return res;
}
int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par){
CodeIso14443aAsTagPar(resp, respLen, par);
int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par) {
return EmSendCmdParEx(resp, respLen, par, false);
}
int EmSendCmdParEx(uint8_t *resp, uint16_t respLen, uint8_t *par, bool collision){
CodeIso14443aAsTagPar(resp, respLen, par, collision);
int res = EmSendCmd14443aRaw(ToSend, ToSendMax);
// do the tracing for the previous reader request and this tag answer:
EmLogTrace(Uart.output,
@ -1697,11 +1713,13 @@ int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par){
par);
return res;
}
int EmSendCmd(uint8_t *resp, uint16_t respLen){
return EmSendCmdEx(resp, respLen, false);
}
int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool collision){
uint8_t par[MAX_PARITY_SIZE] = {0x00};
GetParity(resp, respLen, par);
return EmSendCmdPar(resp, respLen, par);
return EmSendCmdParEx(resp, respLen, par, collision);
}
bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity,
@ -1805,45 +1823,21 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) {
// by fooling the reader there is a collision and forceing the reader to
// increase the uid bytes. The might be an overflow, DoS will occure.
void iso14443a_antifuzz(uint32_t flags){
/*
uint8_t uidlen = 4+1+1+2;
if (( flags & 2 ) == 2 )
uidlen = 7+1+1+2;
if (( flags & 4 ) == 4 )
uidlen = 10+1+1+2;
uint8_t *uid = BigBuf_malloc(uidlen);
// The first response contains the ATQA (note: bytes are transmitted in reverse order).
// Mifare Classic 1K
uint8_t atqa[] = {0x04, 0};
if ( (flags & 2) == 2 ) {
uid[0] = 0x88; // Cascade Tag marker
uid[1] = 0x01;
// Configure the ATQA accordingly
atqa[0] |= 0x40;
} else {
memcpy(response2, data, 4);
// Configure the ATQA accordingly
atqa[0] &= 0xBF;
}
// We need to listen to the high-frequency, peak-detected path.
iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
// allocate buffers:
uint8_t *received = BigBuf_malloc(MAX_FRAME_SIZE);
uint8_t *receivedPar = BigBuf_malloc(MAX_PARITY_SIZE);
uint16_t counter = 0;
int len = 0;
BigBuf_free();
BigBuf_free_keep_EM();
clear_trace();
set_tracing(true);
int len = 0;
// allocate buffers:
uint8_t *received = BigBuf_malloc(MAX_FRAME_SIZE);
uint8_t *receivedPar = BigBuf_malloc(MAX_PARITY_SIZE);
uint8_t *resp = BigBuf_malloc(8);
LED_A_ON();
for (;;) {
WDT_HIT();
@ -1853,47 +1847,47 @@ void iso14443a_antifuzz(uint32_t flags){
Dbprintf("Anti-fuzz stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
break;
}
p_response = NULL;
if ( received[0] == ISO14443A_CMD_WUPA || received[0] == ISO14443A_CMD_REQA) {
resp[0] = 0x04;
resp[1] = 0x00;
if ( (flags & FLAG_7B_UID_IN_DATA) == FLAG_7B_UID_IN_DATA ) {
resp[0] = 0x44;
}
EmSendCmd(resp, 2);
continue;
}
// look at the command now.
if (received[0] == ISO14443A_CMD_REQA) { // Received a REQUEST
p_response = &responses[0];
} else if (received[0] == ISO14443A_CMD_WUPA) { // Received a WAKEUP
p_response = &responses[0];
} else if (received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT) { // Received request for UID (cascade 1)
p_response = &responses[1];
} else if (received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2) { // Received request for UID (cascade 2)
p_response = &responses[2];
} else if (received[1] == 0x70 && received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT) { // Received a SELECT (cascade 1)
p_response = &responses[3];
} else if (received[1] == 0x70 && received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2) { // Received a SELECT (cascade 2)
p_response = &responses[4];
}
if (p_response != NULL) {
// Received request for UID (cascade 1)
if (received[1] >= 0x20 && received[1] <= 0x57 && received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT) {
resp[0] = 0x04;
resp[1] = 0x1C;
resp[2] = 0xE1;
resp[3] = 0xCE;
colpos = 0;
EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n);
// do the tracing for the previous reader request and this tag answer:
uint8_t par[MAX_PARITY_SIZE] = {0x00};
GetParity(p_response->response, p_response->response_n, par);
if ( (flags & FLAG_7B_UID_IN_DATA) == FLAG_7B_UID_IN_DATA ) {
resp[0] = 0x88;
colpos = 8;
}
EmLogTrace(Uart.output,
Uart.len,
Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG,
Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG,
Uart.parity,
p_response->response,
p_response->response_n,
LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG,
(LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG,
par);
EmSendCmdEx(resp, 4, true);
if (MF_DBGLEVEL >= 4) Dbprintf("ANTICOLL or SELECT %x", received[1]);
continue;
} else if (received[1] == 0x20 && received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2) { // Received request for UID (cascade 2)
if (MF_DBGLEVEL >= 4) Dbprintf("ANTICOLL or SELECT_2");
} else if (received[1] == 0x70 && received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT) { // Received a SELECT (cascade 1)
} else if (received[1] == 0x70 && received[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2) { // Received a SELECT (cascade 2)
} else {
Dbprintf("unknown command %x", received[0]);
}
counter++;
}
cmd_send(CMD_ACK,1,0,0,0,0);
switch_off();
Dbprintf("-[ UID until no response [%d]", counter);
*/
switch_off();
BigBuf_free_keep_EM();
}
static void iso14a_set_ATS_times(uint8_t *ats) {