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ADD: @micolous random nonce, adjusted to fit in. Icemanfork only uses Moebius attack, so no need for an extra parameter in client.

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ref: https://github.com/Proxmark/proxmark3/pull/209
This commit is contained in:
iceman1001 2017-01-26 14:21:51 +01:00
commit bf5d7992ce
8 changed files with 90 additions and 28 deletions
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60
armsrc/iso14443a.c
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@ -849,6 +849,8 @@ bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
//-----------------------------------------------------------------------------
void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
#define ATTACK_KEY_COUNT 8 // keep same as define in cmdhfmf.c -> readerAttack()
uint8_t sak = 0;
uint32_t cuid = 0;
uint32_t nonce = 0;
@ -866,7 +868,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
uint8_t cardAUTHSC = 0;
uint8_t cardAUTHKEY = 0xff; // no authentication
// allow collecting up to 8 sets of nonces to allow recovery of up to 8 keys
#define ATTACK_KEY_COUNT 8 // keep same as define in cmdhfmf.c -> readerAttack()
nonces_t ar_nr_resp[ATTACK_KEY_COUNT*2]; // for 2 separate attack types (nml, moebius)
memset(ar_nr_resp, 0x00, sizeof(ar_nr_resp));
@ -972,16 +974,17 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
response3a[0] = sak & 0xFB;
ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
uint8_t response5[] = { 0x01, 0x01, 0x01, 0x01 }; // Very random tag nonce
// Tag NONCE.
uint8_t response5[4];
nonce = prand();
num_to_bytes(nonce, 4, response5);
uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS:
// Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present,
// TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1
// TB(1) = not present. Defaults: FWI = 4 (FWT = 256 * 16 * 2^4 * 1/fc = 4833us), SFGI = 0 (SFG = 256 * 16 * 2^0 * 1/fc = 302us)
// TC(1) = 0x02: CID supported, NAD not supported
ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]);
// the randon nonce
nonce = bytes_to_num(response5, 4);
// Prepare GET_VERSION (different for UL EV-1 / NTAG)
// uint8_t response7_EV1[] = {0x00, 0x04, 0x03, 0x01, 0x01, 0x00, 0x0b, 0x03, 0xfd, 0xf7}; //EV1 48bytes VERSION.
@ -1058,7 +1061,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
}
// incease nonce at every command recieved
nonce++;
nonce = prand();
num_to_bytes(nonce, 4, response5);
p_response = NULL;
@ -1173,8 +1176,16 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
// Collect AR/NR per keytype & sector
if ( (flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK ) {
for (uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
if ( ar_nr_collected[i+mM]==0 || ((cardAUTHSC == ar_nr_resp[i+mM].sector) && (cardAUTHKEY == ar_nr_resp[i+mM].keytype) && (ar_nr_collected[i+mM] > 0)) ) {
if ( ar_nr_collected[i+mM] == 0 || (
(cardAUTHSC == ar_nr_resp[i+mM].sector) &&
(cardAUTHKEY == ar_nr_resp[i+mM].keytype) &&
(ar_nr_collected[i+mM] > 0)
)
) {
// if first auth for sector, or matches sector and keytype of previous auth
if (ar_nr_collected[i+mM] < 2) {
// if we haven't already collected 2 nonces for this sector
@ -1360,7 +1371,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
BigBuf_free_keep_EM();
LED_A_OFF();
if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1) {
if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1) {
for ( uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
if (ar_nr_collected[i] == 2) {
Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i<ATTACK_KEY_COUNT/2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
@ -2472,10 +2483,14 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
uint8_t rUIDBCC3[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
uint8_t rAUTH_NT[] = {0x01, 0x01, 0x01, 0x01}; // very random nonce
// TAG Nonce - Authenticate response
uint8_t rAUTH_NT[4];
uint32_t nonce = prand();
num_to_bytes(nonce, 4, rAUTH_NT);
// uint8_t rAUTH_NT[] = {0x55, 0x41, 0x49, 0x92};// nonce from nested? why this?
uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
// Here, we collect CUID, NT, NR, AR, CUID2, NT2, NR2, AR2
// This can be used in a reader-only attack.
nonces_t ar_nr_resp[ATTACK_KEY_COUNT*2]; // for 2 separate attack types (nml, moebius)
@ -2490,9 +2505,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
uint8_t mM = 0; // moebius_modifier for collection storage
bool doBufResetNext = false;
// Authenticate response - nonce
uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
// -- Determine the UID
// Can be set from emulator memory or incoming data
// Length: 4,7,or 10 bytes
@ -2628,7 +2640,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
crypto1_destroy(pcs);
cardAUTHKEY = 0xff;
LEDsoff();
nonce++;
nonce = prand();
continue;
}
@ -2743,7 +2755,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
}
for (uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
if ( ar_nr_collected[i+mM]==0 || ((cardAUTHSC == ar_nr_resp[i+mM].sector) && (cardAUTHKEY == ar_nr_resp[i+mM].keytype) && (ar_nr_collected[i+mM] > 0)) ) {
if ( ar_nr_collected[i+mM] == 0 || (
(cardAUTHSC == ar_nr_resp[i+mM].sector) &&
(cardAUTHKEY == ar_nr_resp[i+mM].keytype) &&
(ar_nr_collected[i+mM] > 0)
)
) {
// if first auth for sector, or matches sector and keytype of previous auth
if (ar_nr_collected[i+mM] < 2) {
@ -2788,7 +2806,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
// if we've collected all the nonces we need - finish.
if (nonce1_count == moebius_n_count) {
cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,0,0,&ar_nr_resp,sizeof(ar_nr_resp));
cmd_send(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, 0, 0, &ar_nr_resp, sizeof(ar_nr_resp));
nonce1_count = 0;
nonce2_count = 0;
moebius_n_count = 0;
@ -3058,13 +3076,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
// Interactive mode flag, means we need to send ACK
/*
if((flags & FLAG_INTERACTIVE) == FLAG_INTERACTIVE) {
if((flags & FLAG_INTERACTIVE) == FLAG_INTERACTIVE && flags & FLAG_NR_AR_ATTACK == FLAG_NR_AR_ATTACK) {
// May just aswell send the collected ar_nr in the response aswell
uint8_t len = ar_nr_collected * 4 * 4;
cmd_send(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, len, 0, &ar_nr_responses, len);
}
*/
*/
if( ((flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK ) && MF_DBGLEVEL >= 1 ) {
for ( uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
if (ar_nr_collected[i] == 2) {
@ -3093,10 +3111,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
);
}
}
}
}
if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
if (MF_DBGLEVEL >= 1)
Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();