X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/ed6f29f31736440f04743a62bfa0e1917044275e..6e49717b5e025b6ac7139b00f2f39d3b22b424a1:/armsrc/mifaresim.c diff --git a/armsrc/mifaresim.c b/armsrc/mifaresim.c new file mode 100644 index 00000000..91f45efd --- /dev/null +++ b/armsrc/mifaresim.c @@ -0,0 +1,620 @@ +//----------------------------------------------------------------------------- +// Merlok - June 2011, 2012 +// Gerhard de Koning Gans - May 2008 +// Hagen Fritsch - June 2010 +// +// 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. +//----------------------------------------------------------------------------- +// Mifare Classic Card Simulation +//----------------------------------------------------------------------------- + +#include "mifaresim.h" +#include "iso14443a.h" +#include "iso14443crc.h" +#include "crapto1/crapto1.h" +#include "BigBuf.h" +#include "string.h" +#include "mifareutil.h" +#include "fpgaloader.h" +#include "proxmark3.h" +#include "usb_cdc.h" +#include "cmd.h" +#include "protocols.h" +#include "apps.h" + +//mifare emulator states +#define MFEMUL_NOFIELD 0 +#define MFEMUL_IDLE 1 +#define MFEMUL_SELECT1 2 +#define MFEMUL_SELECT2 3 +#define MFEMUL_SELECT3 4 +#define MFEMUL_AUTH1 5 +#define MFEMUL_AUTH2 6 +#define MFEMUL_WORK 7 +#define MFEMUL_WRITEBL2 8 +#define MFEMUL_INTREG_INC 9 +#define MFEMUL_INTREG_DEC 10 +#define MFEMUL_INTREG_REST 11 +#define MFEMUL_HALTED 12 + +#define cardSTATE_TO_IDLE() { cardSTATE = MFEMUL_IDLE; LED_B_OFF(); LED_C_OFF(); } + + + +static void MifareSimInit(uint8_t flags, uint8_t *datain, tag_response_info_t **responses, uint32_t *cuid, uint8_t *uid_len) { + + #define TAG_RESPONSE_COUNT 5 // number of precompiled responses + static uint8_t rATQA[] = {0x04, 0x00}; // indicate Mifare classic 1k 4Byte UID + static uint8_t rUIDBCC1[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 1st cascade level + static uint8_t rUIDBCC2[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 2nd cascade level + static uint8_t rSAKfinal[]= {0x08, 0xb6, 0xdd}; // mifare 1k indicated + static uint8_t rSAK1[] = {0x04, 0xda, 0x17}; // indicate UID not finished + + *uid_len = 4; + // UID can be set from emulator memory or incoming data and can be 4 or 7 bytes long + if (flags & FLAG_4B_UID_IN_DATA) { // get UID from datain + memcpy(rUIDBCC1, datain, 4); + } else if (flags & FLAG_7B_UID_IN_DATA) { + rUIDBCC1[0] = 0x88; + memcpy(rUIDBCC1+1, datain, 3); + memcpy(rUIDBCC2, datain+3, 4); + *uid_len = 7; + } else { + uint8_t probable_atqa; + emlGetMemBt(&probable_atqa, 7, 1); // get UID from emul memory - weak guess at length + if (probable_atqa == 0x00) { // ---------- 4BUID + emlGetMemBt(rUIDBCC1, 0, 4); + } else { // ---------- 7BUID + rUIDBCC1[0] = 0x88; + emlGetMemBt(rUIDBCC1+1, 0, 3); + emlGetMemBt(rUIDBCC2, 3, 4); + *uid_len = 7; + } + } + + switch (*uid_len) { + case 4: + *cuid = bytes_to_num(rUIDBCC1, 4); + rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; + if (MF_DBGLEVEL >= 2) { + Dbprintf("4B UID: %02x%02x%02x%02x", + rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3] ); + } + break; + case 7: + rATQA[0] |= 0x40; + *cuid = bytes_to_num(rUIDBCC2, 4); + rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; + rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; + if (MF_DBGLEVEL >= 2) { + Dbprintf("7B UID: %02x %02x %02x %02x %02x %02x %02x", + rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3], rUIDBCC2[0], rUIDBCC2[1], rUIDBCC2[2], rUIDBCC2[3] ); + } + break; + default: + break; + } + + static tag_response_info_t responses_init[TAG_RESPONSE_COUNT] = { + { .response = rATQA, .response_n = sizeof(rATQA) }, // Answer to request - respond with card type + { .response = rUIDBCC1, .response_n = sizeof(rUIDBCC1) }, // Anticollision cascade1 - respond with first part of uid + { .response = rUIDBCC2, .response_n = sizeof(rUIDBCC2) }, // Anticollision cascade2 - respond with 2nd part of uid + { .response = rSAKfinal, .response_n = sizeof(rSAKfinal) }, // Acknowledge select - last cascade + { .response = rSAK1, .response_n = sizeof(rSAK1) } // Acknowledge select - previous cascades + }; + + // Prepare ("precompile") the responses of the anticollision phase. There will be not enough time to do this at the moment the reader sends its REQA or SELECT + // There are 7 predefined responses with a total of 18 bytes data to transmit. Coded responses need one byte per bit to transfer (data, parity, start, stop, correction) + // 18 * 8 data bits, 18 * 1 parity bits, 5 start bits, 5 stop bits, 5 correction bits -> need 177 bytes buffer + #define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 177 // number of bytes required for precompiled responses + + uint8_t *free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE); + size_t free_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE; + for (size_t i = 0; i < TAG_RESPONSE_COUNT; i++) { + prepare_allocated_tag_modulation(&responses_init[i], &free_buffer_pointer, &free_buffer_size); + } + + *responses = responses_init; + + // indices into responses array: + #define ATQA 0 + #define UIDBCC1 1 + #define UIDBCC2 2 + #define SAKfinal 3 + #define SAK1 4 + +} + + +static bool HasValidCRC(uint8_t *receivedCmd, uint16_t receivedCmd_len) { + uint8_t CRC_byte_1, CRC_byte_2; + ComputeCrc14443(CRC_14443_A, receivedCmd, receivedCmd_len-2, &CRC_byte_1, &CRC_byte_2); + return (receivedCmd[receivedCmd_len-2] == CRC_byte_1 && receivedCmd[receivedCmd_len-1] == CRC_byte_2); +} + + +/** + *MIFARE 1K simulate. + * + *@param flags : + * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK + * FLAG_4B_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that + * FLAG_7B_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that + * FLAG_10B_UID_IN_DATA - use 10-byte UID in the data-section not finished + * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later + * FLAG_RANDOM_NONCE - means we should generate some pseudo-random nonce data (only allows moebius attack) + *@param exitAfterNReads, exit simulation after n blocks have been read, 0 is infinite ... + * (unless reader attack mode enabled then it runs util it gets enough nonces to recover all keys attmpted) + */ +void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) +{ + tag_response_info_t *responses; + uint8_t uid_len = 4; + uint32_t cuid = 0; + uint8_t cardWRBL = 0; + uint8_t cardAUTHSC = 0; + uint8_t cardAUTHKEY = 0xff; // no authentication + uint32_t cardRr = 0; + //uint32_t rn_enc = 0; + uint32_t ans = 0; + uint32_t cardINTREG = 0; + uint8_t cardINTBLOCK = 0; + struct Crypto1State mpcs = {0, 0}; + struct Crypto1State *pcs; + pcs = &mpcs; + uint32_t numReads = 0;//Counts numer of times reader reads a block + uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE]; + uint8_t receivedCmd_dec[MAX_MIFARE_FRAME_SIZE]; + uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE]; + uint16_t receivedCmd_len; + uint8_t response[MAX_MIFARE_FRAME_SIZE]; + uint8_t response_par[MAX_MIFARE_PARITY_SIZE]; + + uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04}; + uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00}; + + //Here, we collect UID,sector,keytype,NT,AR,NR,NT2,AR2,NR2 + // This will be used in the reader-only attack. + + //allow collecting up to 7 sets of nonces to allow recovery of up to 7 keys + #define ATTACK_KEY_COUNT 7 // keep same as define in cmdhfmf.c -> readerAttack() (Cannot be more than 7) + nonces_t ar_nr_resp[ATTACK_KEY_COUNT*2]; //*2 for 2 separate attack types (nml, moebius) 36 * 7 * 2 bytes = 504 bytes + memset(ar_nr_resp, 0x00, sizeof(ar_nr_resp)); + + uint8_t ar_nr_collected[ATTACK_KEY_COUNT*2]; //*2 for 2nd attack type (moebius) + memset(ar_nr_collected, 0x00, sizeof(ar_nr_collected)); + uint8_t nonce1_count = 0; + uint8_t nonce2_count = 0; + uint8_t moebius_n_count = 0; + bool gettingMoebius = false; + uint8_t mM = 0; //moebius_modifier for collection storage + + // Authenticate response - nonce + uint32_t nonce; + if (flags & FLAG_RANDOM_NONCE) { + nonce = prand(); + } else { + nonce = bytes_to_num(rAUTH_NT, 4); + } + + // free eventually allocated BigBuf memory but keep Emulator Memory + BigBuf_free_keep_EM(); + + MifareSimInit(flags, datain, &responses, &cuid, &uid_len); + + // We need to listen to the high-frequency, peak-detected path. + iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); + + // clear trace + clear_trace(); + set_tracing(true); + ResetSspClk(); + + bool finished = false; + bool button_pushed = BUTTON_PRESS(); + int cardSTATE = MFEMUL_NOFIELD; + + while (!button_pushed && !finished && !usb_poll_validate_length()) { + WDT_HIT(); + + // find reader field + if (cardSTATE == MFEMUL_NOFIELD) { + int vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10; + if (vHf > MF_MINFIELDV) { + LED_A_ON(); + cardSTATE_TO_IDLE(); + } + button_pushed = BUTTON_PRESS(); + continue; + } + + //Now, get data + int res = EmGetCmd(receivedCmd, &receivedCmd_len, receivedCmd_par); + + if (res == 2) { //Field is off! + LEDsoff(); + cardSTATE = MFEMUL_NOFIELD; + continue; + } else if (res == 1) { // button pressed + button_pushed = true; + break; + } + + // WUPA in HALTED state or REQA or WUPA in any other state + if (receivedCmd_len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) { + EmSendPrecompiledCmd(&responses[ATQA], (receivedCmd[0] == ISO14443A_CMD_WUPA)); + + // init crypto block + crypto1_destroy(pcs); + cardAUTHKEY = 0xff; + if (flags & FLAG_RANDOM_NONCE) { + nonce = prand(); + } + LED_B_OFF(); + LED_C_OFF(); + cardSTATE = MFEMUL_SELECT1; + continue; + } + + switch (cardSTATE) { + case MFEMUL_NOFIELD: + case MFEMUL_HALTED: + case MFEMUL_IDLE:{ + break; + } + case MFEMUL_SELECT1:{ + // select all - 0x93 0x20 + if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x20)) { + if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL CL1 received"); + EmSendPrecompiledCmd(&responses[UIDBCC1], false); + break; + } + // select card - 0x93 0x70 ... + if (receivedCmd_len == 9 && + (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], responses[UIDBCC1].response, 4) == 0)) { + if (MF_DBGLEVEL >= 4) Dbprintf("SELECT CL1 %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); + if (uid_len == 4) { + EmSendPrecompiledCmd(&responses[SAKfinal], false); + LED_B_ON(); + cardSTATE = MFEMUL_WORK; + break; + } else if (uid_len == 7) { + EmSendPrecompiledCmd(&responses[SAK1], false); + cardSTATE = MFEMUL_SELECT2; + break; + } + } + cardSTATE_TO_IDLE(); + break; + } + case MFEMUL_SELECT2:{ + // select all cl2 - 0x95 0x20 + if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x20)) { + if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL CL2 received"); + EmSendPrecompiledCmd(&responses[UIDBCC2], false); + break; + } + // select cl2 card - 0x95 0x70 xxxxxxxxxxxx + if (receivedCmd_len == 9 && + (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], responses[UIDBCC2].response, 4) == 0)) { + if (uid_len == 7) { + if (MF_DBGLEVEL >= 4) Dbprintf("SELECT CL2 %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); + EmSendPrecompiledCmd(&responses[SAKfinal], false); + LED_B_ON(); + cardSTATE = MFEMUL_WORK; + break; + } + } + cardSTATE_TO_IDLE(); + break; + } + case MFEMUL_WORK:{ + if (receivedCmd_len != 4) { // all commands must have exactly 4 bytes + break; + } + bool encrypted_data = (cardAUTHKEY != 0xFF) ; + if (encrypted_data) { + // decrypt seqence + mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec); + } else { + memcpy(receivedCmd_dec, receivedCmd, receivedCmd_len); + } + if (!HasValidCRC(receivedCmd_dec, receivedCmd_len)) { // all commands must have a valid CRC + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + break; + } + if (receivedCmd_dec[0] == MIFARE_AUTH_KEYA || receivedCmd_dec[0] == MIFARE_AUTH_KEYB) { + // if authenticating to a block that shouldn't exist - as long as we are not doing the reader attack + if (receivedCmd_dec[1] >= 16 * 4 && !(flags & FLAG_NR_AR_ATTACK)) { + //is this the correct response to an auth on a out of range block? marshmellow + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]); + break; + } + cardAUTHSC = receivedCmd_dec[1] / 4; // received block num + cardAUTHKEY = receivedCmd_dec[0] & 0x01; + crypto1_destroy(pcs);//Added by martin + crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); + if (!encrypted_data) { // first authentication + if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd_dec[1], receivedCmd_dec[1], cardAUTHKEY); + crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state + num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce + } else { // nested authentication + if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d", receivedCmd_dec[1], receivedCmd_dec[1], cardAUTHKEY); + ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); + num_to_bytes(ans, 4, rAUTH_AT); + } + EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); + cardSTATE = MFEMUL_AUTH1; + break; + } + if (!encrypted_data) { // all other commands must be encrypted (authenticated) + break; + } + if(receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK + || receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK + || receivedCmd_dec[0] == MIFARE_CMD_INC + || receivedCmd_dec[0] == MIFARE_CMD_DEC + || receivedCmd_dec[0] == MIFARE_CMD_RESTORE + || receivedCmd_dec[0] == MIFARE_CMD_TRANSFER) { + if (receivedCmd_dec[1] >= 16 * 4) { + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]); + break; + } + if (receivedCmd_dec[1] / 4 != cardAUTHSC) { + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd_dec[0],receivedCmd_dec[1],cardAUTHSC); + break; + } + } + if (receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK) { + if (MF_DBGLEVEL >= 4) { + Dbprintf("Reader reading block %d (0x%02x)",receivedCmd_dec[1],receivedCmd_dec[1]); + } + emlGetMem(response, receivedCmd_dec[1], 1); + AppendCrc14443a(response, 16); + mf_crypto1_encrypt(pcs, response, 18, response_par); + EmSendCmdPar(response, 18, response_par); + numReads++; + if(exitAfterNReads > 0 && numReads == exitAfterNReads) { + Dbprintf("%d reads done, exiting", numReads); + finished = true; + } + break; + } + if (receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK) { + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd_dec[1],receivedCmd_dec[1]); + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); + cardWRBL = receivedCmd_dec[1]; + cardSTATE = MFEMUL_WRITEBL2; + break; + } + if (receivedCmd_dec[0] == MIFARE_CMD_INC || receivedCmd_dec[0] == MIFARE_CMD_DEC || receivedCmd_dec[0] == MIFARE_CMD_RESTORE) { + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]); + if (emlCheckValBl(receivedCmd_dec[1])) { + if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking"); + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + break; + } + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); + cardWRBL = receivedCmd_dec[1]; + if (receivedCmd_dec[0] == MIFARE_CMD_INC) + cardSTATE = MFEMUL_INTREG_INC; + if (receivedCmd_dec[0] == MIFARE_CMD_DEC) + cardSTATE = MFEMUL_INTREG_DEC; + if (receivedCmd_dec[0] == MIFARE_CMD_RESTORE) + cardSTATE = MFEMUL_INTREG_REST; + break; + } + if (receivedCmd_dec[0] == MIFARE_CMD_TRANSFER) { + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]); + if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd_dec[1])) + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + else + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); + break; + } + // halt + if (receivedCmd_dec[0] == ISO14443A_CMD_HALT && receivedCmd_dec[1] == 0x00) { + if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED."); + LED_B_OFF(); + LED_C_OFF(); + cardSTATE = MFEMUL_HALTED; + break; + } + // command not allowed + if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking"); + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + break; + } + case MFEMUL_AUTH1:{ + if (receivedCmd_len != 8) { + cardSTATE_TO_IDLE(); + break; + } + + uint32_t nr = bytes_to_num(receivedCmd, 4); + uint32_t ar = bytes_to_num(&receivedCmd[4], 4); + + // Collect AR/NR per keytype & sector + if(flags & 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 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 + if (ar_nr_resp[ar_nr_collected[i+mM]].ar != ar) { + // Avoid duplicates... probably not necessary, ar should vary. + if (ar_nr_collected[i+mM]==0) { + // first nonce collect + ar_nr_resp[i+mM].cuid = cuid; + ar_nr_resp[i+mM].sector = cardAUTHSC; + ar_nr_resp[i+mM].keytype = cardAUTHKEY; + ar_nr_resp[i+mM].nonce = nonce; + ar_nr_resp[i+mM].nr = nr; + ar_nr_resp[i+mM].ar = ar; + nonce1_count++; + // add this nonce to first moebius nonce + ar_nr_resp[i+ATTACK_KEY_COUNT].cuid = cuid; + ar_nr_resp[i+ATTACK_KEY_COUNT].sector = cardAUTHSC; + ar_nr_resp[i+ATTACK_KEY_COUNT].keytype = cardAUTHKEY; + ar_nr_resp[i+ATTACK_KEY_COUNT].nonce = nonce; + ar_nr_resp[i+ATTACK_KEY_COUNT].nr = nr; + ar_nr_resp[i+ATTACK_KEY_COUNT].ar = ar; + ar_nr_collected[i+ATTACK_KEY_COUNT]++; + } else { // second nonce collect (std and moebius) + ar_nr_resp[i+mM].nonce2 = nonce; + ar_nr_resp[i+mM].nr2 = nr; + ar_nr_resp[i+mM].ar2 = ar; + if (!gettingMoebius) { + nonce2_count++; + // check if this was the last second nonce we need for std attack + if ( nonce2_count == nonce1_count ) { + // done collecting std test switch to moebius + // first finish incrementing last sample + ar_nr_collected[i+mM]++; + // switch to moebius collection + gettingMoebius = true; + mM = ATTACK_KEY_COUNT; + if (flags & FLAG_RANDOM_NONCE) { + nonce = prand(); + } else { + nonce = nonce*7; + } + break; + } + } else { + moebius_n_count++; + // if we've collected all the nonces we need - finish. + if (nonce1_count == moebius_n_count) finished = true; + } + } + ar_nr_collected[i+mM]++; + } + } + // we found right spot for this nonce stop looking + break; + } + } + } + + // --- crypto + crypto1_word(pcs, nr , 1); + cardRr = ar ^ crypto1_word(pcs, 0, 0); + + // test if auth OK + if (cardRr != prng_successor(nonce, 64)){ + if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x", + cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', + cardRr, prng_successor(nonce, 64)); + // Shouldn't we respond anything here? + // Right now, we don't nack or anything, which causes the + // reader to do a WUPA after a while. /Martin + // -- which is the correct response. /piwi + cardAUTHKEY = 0xff; // not authenticated + cardSTATE_TO_IDLE(); + break; + } + ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0); + num_to_bytes(ans, 4, rAUTH_AT); + EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); + if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED for sector %d with key %c.", cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B'); + LED_C_ON(); + cardSTATE = MFEMUL_WORK; + break; + } + case MFEMUL_WRITEBL2:{ + if (receivedCmd_len == 18) { + mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec); + if (HasValidCRC(receivedCmd_dec, receivedCmd_len)) { + emlSetMem(receivedCmd_dec, cardWRBL, 1); + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); + cardSTATE = MFEMUL_WORK; + break; + } + } + cardSTATE_TO_IDLE(); + break; + } + case MFEMUL_INTREG_INC:{ + if (receivedCmd_len == 6) { + mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t*)&ans); + if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + cardSTATE_TO_IDLE(); + break; + } + cardINTREG = cardINTREG + ans; + } + cardSTATE = MFEMUL_WORK; + break; + } + case MFEMUL_INTREG_DEC:{ + if (receivedCmd_len == 6) { + mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t*)&ans); + if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + cardSTATE_TO_IDLE(); + break; + } + } + cardINTREG = cardINTREG - ans; + cardSTATE = MFEMUL_WORK; + break; + } + case MFEMUL_INTREG_REST:{ + mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t*)&ans); + if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); + cardSTATE_TO_IDLE(); + break; + } + cardSTATE = MFEMUL_WORK; + break; + } + } + button_pushed = BUTTON_PRESS(); + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); + + 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= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", get_tracing(), BigBuf_get_traceLen()); + + if(flags & FLAG_INTERACTIVE) { // Interactive mode flag, means we need to send ACK + //Send the collected ar_nr in the response + cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,button_pushed,0,&ar_nr_resp,sizeof(ar_nr_resp)); + } +}