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add a specific check function for static nonces (used in 'hf mf nested') (#911)
* add a specific check function for static nonces in 'hf mf nested' * uses a fixed nr_enc and does all the crypto operations on client * for all possible keys calculate par_enc and ar_enc and send them to device * CHANGELOG update
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pwpiwi
GitHub
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bedae7768c
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aa8ff592ae
7 changed files with 308 additions and 232 deletions
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@ -640,8 +640,7 @@ int valid_nonce(uint32_t Nt, uint32_t NtEnc, uint32_t Ks1, uint8_t *parity) {
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// Mifare Classic Cards" in Proceedings of the 22nd ACM SIGSAC Conference on
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// Computer and Communications Security, 2015
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//-----------------------------------------------------------------------------
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void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags, uint8_t *datain)
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{
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void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags, uint8_t *datain) {
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uint64_t ui64Key = 0;
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uint8_t uid[10];
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uint32_t cuid;
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@ -666,7 +665,6 @@ void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags,
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bool field_off = flags & 0x0004;
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LED_A_ON();
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LED_C_OFF();
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if (initialize) {
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iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
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@ -674,8 +672,6 @@ void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags,
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set_tracing(true);
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}
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LED_C_ON();
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uint16_t num_nonces = 0;
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bool have_uid = false;
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for (uint16_t i = 0; i <= USB_CMD_DATA_SIZE - 9; ) {
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@ -747,21 +743,18 @@ void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags,
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}
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LED_C_OFF();
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crypto1_destroy(pcs);
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if (field_off) {
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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LEDsoff();
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LED_D_OFF();
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}
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LED_B_ON();
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cmd_send(CMD_ACK, isOK, cuid, num_nonces, buf, sizeof(buf));
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LED_B_OFF();
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if (MF_DBGLEVEL >= 3) DbpString("AcquireEncryptedNonces finished");
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cmd_send(CMD_ACK, isOK, cuid, num_nonces, buf, sizeof(buf));
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LED_A_OFF();
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}
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@ -783,9 +776,10 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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uint16_t davg;
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static uint16_t dmin, dmax;
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uint8_t uid[10];
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uint32_t cuid, nt1, nt2, nttmp, nttest, ks1;
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uint32_t cuid, nt1, nt2_enc, nttmp, nttest, ks1;
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uint8_t par[1];
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uint32_t target_nt[2], target_ks[2];
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uint32_t fixed_nt = 0;
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uint8_t target_nt_duplicate_count = 0;
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uint8_t par_array[4];
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@ -812,7 +806,6 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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#define NESTED_MAX_TRIES 12
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uint16_t unsuccessfull_tries = 0;
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if (calibrate) { // for first call only. Otherwise reuse previous calibration
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LED_B_ON();
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WDT_HIT();
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davg = dmax = 0;
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@ -846,13 +839,14 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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rtr--;
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continue;
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};
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fixed_nt = nt1;
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if (delta_time) {
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auth2_time = auth1_time + delta_time;
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} else {
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auth2_time = 0;
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}
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if (mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_NESTED, &nt2, &auth2_time, NULL)) {
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if (mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_NESTED, &nt2_enc, &auth2_time, NULL)) {
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if (MF_DBGLEVEL >= 1) Dbprintf("Nested: Auth2 error");
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rtr--;
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continue;
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@ -861,7 +855,7 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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nttmp = prng_successor(nt1, 100); //NXP Mifare is typical around 840,but for some unlicensed/compatible mifare card this can be 160
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for (i = 101; i < 1200; i++) {
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nttmp = prng_successor(nttmp, 1);
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if (nttmp == nt2) break;
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if (nttmp == nt2_enc) break;
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}
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if (i != 1200) {
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@ -889,21 +883,17 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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dmin = davg - 2;
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dmax = davg + 2;
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LED_B_OFF();
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}
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// -------------------------------------------------------------------------------------------------
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LED_C_ON();
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// get crypted nonces for target sector
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for (i=0; i < 2 && !isOK; i++) { // look for exactly two different nonces
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for (i = 0; i < 2 && !isOK; i++) { // look for exactly two different nonces
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target_nt[i] = 0;
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while (target_nt[i] == 0 && !isOK) { // continue until we have an unambiguous nonce
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// prepare next select. No need to power down the card.
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if(mifare_classic_halt(pcs, cuid)) {
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if (mifare_classic_halt(pcs, cuid)) {
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if (MF_DBGLEVEL >= 1) Dbprintf("Nested: Halt error");
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continue;
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}
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@ -934,8 +924,8 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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continue;
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}
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nt2 = bytes_to_num(receivedAnswer, 4);
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if (MF_DBGLEVEL >= 3) Dbprintf("Nonce#%d: Testing nt1=%08x nt2enc=%08x nt2par=%02x", i+1, nt1, nt2, par[0]);
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nt2_enc = bytes_to_num(receivedAnswer, 4);
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if (MF_DBGLEVEL >= 3) Dbprintf("Nonce#%d: Testing nt1=%08x nt2enc=%08x nt2par=%02x", i+1, nt1, nt2_enc, par[0]);
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// Parity validity check
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for (j = 0; j < 4; j++) {
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@ -946,9 +936,9 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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nttest = prng_successor(nt1, dmin - 1);
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for (j = dmin; j < dmax + 1; j++) {
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nttest = prng_successor(nttest, 1);
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ks1 = nt2 ^ nttest;
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ks1 = nt2_enc ^ nttest;
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if (valid_nonce(nttest, nt2, ks1, par_array)){
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if (valid_nonce(nttest, nt2_enc, ks1, par_array)){
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if (ncount > 0) { // we are only interested in disambiguous nonces, try again
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if (MF_DBGLEVEL >= 3) Dbprintf("Nonce#%d: dismissed (ambigous), ntdist=%d", i+1, j);
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target_nt[i] = 0;
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@ -974,28 +964,25 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
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}
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}
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LED_C_OFF();
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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LED_D_OFF();
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// ----------------------------- crypto1 destroy
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crypto1_destroy(pcs);
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uint8_t buf[4 + 4 * 4 + 4];
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uint8_t buf[4 + 4 * 4 + 4 + 4];
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memcpy(buf, &cuid, 4);
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memcpy(buf+4, &target_nt[0], 4);
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memcpy(buf+8, &target_ks[0], 4);
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memcpy(buf+12, &target_nt[1], 4);
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memcpy(buf+16, &target_ks[1], 4);
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memcpy(buf+20, &authentication_timeout, 4);
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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memcpy(buf+24, &fixed_nt, 4);
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if (MF_DBGLEVEL >= 3) DbpString("NESTED FINISHED");
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LED_B_ON();
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cmd_send(CMD_ACK, isOK, 0, targetBlockNo + (targetKeyType * 0x100), buf, sizeof(buf));
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LED_B_OFF();
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LEDsoff();
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LED_A_OFF();
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}
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@ -1011,6 +998,7 @@ void MifareChkKeys(uint16_t arg0, uint32_t arg1, uint8_t arg2, uint8_t *datain)
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bool multisectorCheck = arg1 & 0x02;
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bool init = arg1 & 0x04;
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bool drop_field = arg1 & 0x08;
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bool fixed_nonce = arg1 & 0x10;
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uint32_t auth_timeout = arg1 >> 16;
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uint8_t keyCount = arg2;
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@ -1039,7 +1027,14 @@ void MifareChkKeys(uint16_t arg0, uint32_t arg1, uint8_t arg2, uint8_t *datain)
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} else {
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cmd_send(CMD_ACK, 0, res, 0, NULL, 0);
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}
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} else {
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} else if (fixed_nonce) {
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res = MifareChkBlockKeysFixedNonce(datain, keyCount, blockNo, keyType, &auth_timeout, OLD_MF_DBGLEVEL);
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if (res > 0) {
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cmd_send(CMD_ACK, 1, res, 0, NULL, 0); // key found
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} else {
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cmd_send(CMD_ACK, 0, res, 0, NULL, 0); // no key found or aborted
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}
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} else {
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res = MifareChkBlockKeys(datain, keyCount, blockNo, keyType, &auth_timeout, OLD_MF_DBGLEVEL);
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if (res > 0) {
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cmd_send(CMD_ACK, 1, res, 0, datain + (res - 1) * 6, 6);
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