X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/8bdb6043b09a32998a2ea16e8aa14bdc815ca7ca..refs/pull/548/head:/client/mifarehost.c?ds=sidebyside diff --git a/client/mifarehost.c b/client/mifarehost.c index ca5d97e1..d204bf12 100644 --- a/client/mifarehost.c +++ b/client/mifarehost.c @@ -540,35 +540,10 @@ int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID) { return 0; } -int mfCIdentify() -{ - UsbCommand c; -// UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_CONNECT | ISO14A_NO_DISCONNECT, 0, 0}}; -// SendCommand(&c); - - UsbCommand resp; -// WaitForResponse(CMD_ACK,&resp); - - // iso14a_card_select_t card; - // memcpy(&card, (iso14a_card_select_t *)resp.d.asBytes, sizeof(iso14a_card_select_t)); - - // uint64_t select_status = resp.arg[0]; // 0: couldn't read, 1: OK, with ATS, 2: OK, no ATS, 3: proprietary Anticollision - - // if(select_status != 0) { - // uint8_t rats[] = { 0xE0, 0x80 }; // FSDI=8 (FSD=256), CID=0 - // c.arg[0] = ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_DISCONNECT; - // c.arg[1] = 2; - // c.arg[2] = 0; - // memcpy(c.d.asBytes, rats, 2); - // SendCommand(&c); - // WaitForResponse(CMD_ACK,&resp); - // } - - c.cmd = CMD_MIFARE_CIDENT; - c.arg[0] = 0; - c.arg[1] = 0; - c.arg[2] = 0; +int mfCIdentify() { + UsbCommand c = {CMD_MIFARE_CIDENT, {0, 0, 0}}; SendCommand(&c); + UsbCommand resp; WaitForResponse(CMD_ACK,&resp); uint8_t isGeneration = resp.arg[0] & 0xff; @@ -578,13 +553,6 @@ int mfCIdentify() default: PrintAndLog("No chinese magic backdoor command detected"); break; } - // disconnect -// c.cmd = CMD_READER_ISO_14443a; -// c.arg[0] = 0; -// c.arg[1] = 0; -// c.arg[2] = 0; -// SendCommand(&c); - return (int) isGeneration; } @@ -641,7 +609,8 @@ int saveTraceCard(void) { for (int i = 0; i < 64; i++) { // blocks for (int j = 0; j < 16; j++) // bytes fprintf(f, "%02x", *(traceCard + i * 16 + j)); - fprintf(f,"\n"); + if (i < 63) + fprintf(f,"\n"); } fclose(f); return 0; @@ -858,20 +827,30 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { if (len ==4) { traceState = TRACE_IDLE; - at_enc = bytes_to_num(data, 4); - - // decode key here) - ks2 = ar_enc ^ prng_successor(nt, 64); - ks3 = at_enc ^ prng_successor(nt, 96); - revstate = lfsr_recovery64(ks2, ks3); - lfsr_rollback_word(revstate, 0, 0); - lfsr_rollback_word(revstate, 0, 0); - lfsr_rollback_word(revstate, nr_enc, 1); - lfsr_rollback_word(revstate, uid ^ nt, 0); + if (!traceCrypto1) { + at_enc = bytes_to_num(data, 4); + + // decode key here) + ks2 = ar_enc ^ prng_successor(nt, 64); + ks3 = at_enc ^ prng_successor(nt, 96); + revstate = lfsr_recovery64(ks2, ks3); + lfsr_rollback_word(revstate, 0, 0); + lfsr_rollback_word(revstate, 0, 0); + lfsr_rollback_word(revstate, nr_enc, 1); + lfsr_rollback_word(revstate, uid ^ nt, 0); + + crypto1_get_lfsr(revstate, &lfsr); + printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF)); + AddLogUint64(logHexFileName, "key> ", lfsr); + } else { + printf("key> nested not implemented!\n"); + at_enc = bytes_to_num(data, 4); + + crypto1_destroy(traceCrypto1); - crypto1_get_lfsr(revstate, &lfsr); - printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF)); - AddLogUint64(logHexFileName, "key> ", lfsr); + // not implemented + traceState = TRACE_ERROR; + } int blockShift = ((traceCurBlock & 0xFC) + 3) * 16; if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4); @@ -889,15 +868,6 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { // set cryptosystem state traceCrypto1 = lfsr_recovery64(ks2, ks3); - -// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt; - - /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr - crypto1_word(traceCrypto1, nt ^ uid, 0); - crypto1_word(traceCrypto1, ar, 1); - crypto1_word(traceCrypto1, 0, 0); - crypto1_word(traceCrypto1, 0, 0);*/ - return 0; } else { traceState = TRACE_ERROR; @@ -935,3 +905,72 @@ int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, return 0; } +/** validate_prng_nonce + * Determine if nonce is deterministic. ie: Suspectable to Darkside attack. + * returns + * true = weak prng + * false = hardend prng + */ +bool validate_prng_nonce(uint32_t nonce) { + uint16_t *dist = 0; + uint16_t x, i; + + dist = malloc(2 << 16); + if(!dist) + return -1; + + // init prng table: + for (x = i = 1; i; ++i) { + dist[(x & 0xff) << 8 | x >> 8] = i; + x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15; + } + + uint32_t res = (65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535; + + free(dist); + return (res == 16); +} + +/* Detect Tag Prng, +* function performs a partial AUTH, where it tries to authenticate against block0, key A, but only collects tag nonce. +* the tag nonce is check to see if it has a predictable PRNG. +* @returns +* TRUE if tag uses WEAK prng (ie Now the NACK bug also needs to be present for Darkside attack) +* FALSE is tag uses HARDEND prng (ie hardnested attack possible, with known key) +*/ +int DetectClassicPrng(void){ + + UsbCommand resp, respA; + uint8_t cmd[] = {0x60, 0x00}; // MIFARE_AUTH_KEYA + uint32_t flags = ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_RATS; + + UsbCommand c = {CMD_READER_ISO_14443a, {flags, sizeof(cmd), 0}}; + memcpy(c.d.asBytes, cmd, sizeof(cmd)); + + clearCommandBuffer(); + SendCommand(&c); + if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) { + PrintAndLog("PRNG UID: Reply timeout."); + return -1; + } + + // if select tag failed. + if (resp.arg[0] == 0) { + PrintAndLog("PRNG error: selecting tag failed, can't detect prng."); + return -1; + } + + if (!WaitForResponseTimeout(CMD_ACK, &respA, 5000)) { + PrintAndLog("PRNG data: Reply timeout."); + return -1; + } + + // check respA + if (respA.arg[0] != 4) { + PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]); + return -1; + } + + uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]); + return validate_prng_nonce(nonce); +}