X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/0db6ed9a7177295a48e8595066a56808bf4b939f..a826cb0df1dd2cd11facd5ab8fe0618422fa0054:/armsrc/iso14443a.c diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 862594e9..06b6d32f 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -718,6 +718,8 @@ void RAMFUNC SniffIso14443a(uint8_t param) { Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len); Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]); + + set_tracing(FALSE); } //----------------------------------------------------------------------------- @@ -937,7 +939,6 @@ bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) { //----------------------------------------------------------------------------- void SimulateIso14443aTag(int tagType, int flags, byte_t* data) { - //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2 // This can be used in a reader-only attack. // (it can also be retrieved via 'hf 14a list', but hey... @@ -947,10 +948,10 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) uint8_t sak; // PACK response to PWD AUTH for EV1/NTAG - uint8_t response8[4]; + uint8_t response8[4] = {0,0,0,0}; // The first response contains the ATQA (note: bytes are transmitted in reverse order). - uint8_t response1[2]; + uint8_t response1[2] = {0,0}; switch (tagType) { case 1: { // MIFARE Classic @@ -1047,7 +1048,7 @@ 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 + uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce 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 @@ -1151,9 +1152,9 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ uint8_t block = receivedCmd[1]; if ( tagType == 7 ) { - uint8_t start = 4 * block; + uint16_t start = 4 * block; - if ( block < 4 ) { + /*if ( block < 4 ) { //NTAG 215 uint8_t blockdata[50] = { data[0],data[1],data[2], 0x88 ^ data[0] ^ data[1] ^ data[2], @@ -1167,12 +1168,12 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) 0x00,0x00}; AppendCrc14443a(blockdata+start, 16); EmSendCmdEx( blockdata+start, MAX_MIFARE_FRAME_SIZE, false); - } else { + } else {*/ uint8_t emdata[MAX_MIFARE_FRAME_SIZE]; emlGetMemBt( emdata, start, 16); AppendCrc14443a(emdata, 16); EmSendCmdEx(emdata, sizeof(emdata), false); - } + //} p_response = NULL; } else { @@ -1299,7 +1300,8 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) if ( tagType == 7 ) { p_response = &responses[8]; // PACK response uint32_t pwd = bytes_to_num(receivedCmd+1,4); - Dbprintf("Auth attempt: %08x", pwd); + + if ( MF_DBGLEVEL >= 3) Dbprintf("Auth attempt: %08x", pwd); } } else { @@ -1414,12 +1416,15 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) } FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + set_tracing(FALSE); BigBuf_free_keep_EM(); LED_A_OFF(); - Dbprintf("-[ Wake ups after halt [%d]", happened); - Dbprintf("-[ Messages after halt [%d]", happened2); - Dbprintf("-[ Num of received cmd [%d]", cmdsRecvd); + if (MF_DBGLEVEL >= 4){ + Dbprintf("-[ Wake ups after halt [%d]", happened); + Dbprintf("-[ Messages after halt [%d]", happened2); + Dbprintf("-[ Num of received cmd [%d]", cmdsRecvd); + } } @@ -1430,7 +1435,7 @@ void PrepareDelayedTransfer(uint16_t delay) uint8_t bitmask = 0; uint8_t bits_to_shift = 0; uint8_t bits_shifted = 0; - + delay &= 0x07; if (delay) { for (uint16_t i = 0; i < delay; i++) { @@ -2177,6 +2182,7 @@ void ReaderIso14443a(UsbCommand *c) } FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + set_tracing(FALSE); LEDsoff(); } @@ -2194,7 +2200,7 @@ int32_t dist_nt(uint32_t nt1, uint32_t nt2) { nttmp1 = nt1; nttmp2 = nt2; - for (i = 1; i < 32768; i++) { + for (i = 1; i < 0xFFFF; i++) { nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i; nttmp2 = prng_successor(nttmp2, 1); @@ -2244,19 +2250,20 @@ void ReaderMifare(bool first_try) byte_t par_list[8] = {0x00}; byte_t ks_list[8] = {0x00}; + #define PRNG_SEQUENCE_LENGTH (1 << 16); static uint32_t sync_time = 0; - static uint32_t sync_cycles = 0; + static int32_t sync_cycles = 0; int catch_up_cycles = 0; int last_catch_up = 0; + uint16_t elapsed_prng_sequences; uint16_t consecutive_resyncs = 0; int isOK = 0; if (first_try) { mf_nr_ar3 = 0; sync_time = GetCountSspClk() & 0xfffffff8; - sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). + sync_cycles = PRNG_SEQUENCE_LENGTH; //65536; //0x10000 // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). nt_attacked = 0; - nt = 0; par[0] = 0; } else { @@ -2271,8 +2278,17 @@ void ReaderMifare(bool first_try) LED_C_OFF(); - #define DARKSIDE_MAX_TRIES 32 // number of tries to sync on PRNG cycle. Then give up. - uint16_t unsuccessfull_tries = 0; + #define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up. + #define MAX_SYNC_TRIES 32 + #define NUM_DEBUG_INFOS 8 // per strategy + #define MAX_STRATEGY 3 + uint16_t unexpected_random = 0; + uint16_t sync_tries = 0; + int16_t debug_info_nr = -1; + uint16_t strategy = 0; + int32_t debug_info[MAX_STRATEGY][NUM_DEBUG_INFOS]; + uint32_t select_time; + uint32_t halt_time; for(uint16_t i = 0; TRUE; i++) { @@ -2285,21 +2301,60 @@ void ReaderMifare(bool first_try) break; } + if (strategy == 2) { + // test with additional hlt command + halt_time = 0; + int len = mifare_sendcmd_short(NULL, false, 0x50, 0x00, receivedAnswer, receivedAnswerPar, &halt_time); + if (len && MF_DBGLEVEL >= 3) { + Dbprintf("Unexpected response of %d bytes to hlt command (additional debugging).", len); + } + } + + if (strategy == 3) { + // test with FPGA power off/on + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(200); + iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); + SpinDelay(100); + } + if(!iso14443a_select_card(uid, NULL, &cuid)) { if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card"); continue; } + select_time = GetCountSspClk(); - sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; - catch_up_cycles = 0; + elapsed_prng_sequences = 1; + if (debug_info_nr == -1) { + sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; + catch_up_cycles = 0; - // if we missed the sync time already, advance to the next nonce repeat - while(GetCountSspClk() > sync_time) { - sync_time = (sync_time & 0xfffffff8) + sync_cycles; - } + // if we missed the sync time already, advance to the next nonce repeat + while(GetCountSspClk() > sync_time) { + elapsed_prng_sequences++; + sync_time = (sync_time & 0xfffffff8) + sync_cycles; + } - // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) - ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); + // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) + ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); + } else { + // collect some information on tag nonces for debugging: + #define DEBUG_FIXED_SYNC_CYCLES PRNG_SEQUENCE_LENGTH + if (strategy == 0) { + // nonce distances at fixed time after card select: + sync_time = select_time + DEBUG_FIXED_SYNC_CYCLES; + } else if (strategy == 1) { + // nonce distances at fixed time between authentications: + sync_time = sync_time + DEBUG_FIXED_SYNC_CYCLES; + } else if (strategy == 2) { + // nonce distances at fixed time after halt: + sync_time = halt_time + DEBUG_FIXED_SYNC_CYCLES; + } else { + // nonce_distances at fixed time after power on + sync_time = DEBUG_FIXED_SYNC_CYCLES; + } + ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); + } // Receive the (4 Byte) "random" nonce if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) { @@ -2317,19 +2372,37 @@ void ReaderMifare(bool first_try) int nt_distance = dist_nt(previous_nt, nt); if (nt_distance == 0) { nt_attacked = nt; - } - else { + } else { if (nt_distance == -99999) { // invalid nonce received - unsuccessfull_tries++; - if (!nt_attacked && unsuccessfull_tries > DARKSIDE_MAX_TRIES) { + unexpected_random++; + if (unexpected_random > MAX_UNEXPECTED_RANDOM) { isOK = -3; // Card has an unpredictable PRNG. Give up break; } else { continue; // continue trying... } } - sync_cycles = (sync_cycles - nt_distance); - if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles); + if (++sync_tries > MAX_SYNC_TRIES) { + if (strategy > MAX_STRATEGY || MF_DBGLEVEL < 3) { + isOK = -4; // Card's PRNG runs at an unexpected frequency or resets unexpectedly + break; + } else { // continue for a while, just to collect some debug info + debug_info[strategy][debug_info_nr] = nt_distance; + debug_info_nr++; + if (debug_info_nr == NUM_DEBUG_INFOS) { + strategy++; + debug_info_nr = 0; + } + continue; + } + } + sync_cycles = (sync_cycles - nt_distance/elapsed_prng_sequences); + if (sync_cycles <= 0) { + sync_cycles += PRNG_SEQUENCE_LENGTH; + } + if (MF_DBGLEVEL >= 3) { + Dbprintf("calibrating in cycle %d. nt_distance=%d, elapsed_prng_sequences=%d, new sync_cycles: %d\n", i, nt_distance, elapsed_prng_sequences, sync_cycles); + } continue; } } @@ -2340,6 +2413,7 @@ void ReaderMifare(bool first_try) catch_up_cycles = 0; continue; } + catch_up_cycles /= elapsed_prng_sequences; if (catch_up_cycles == last_catch_up) { consecutive_resyncs++; } @@ -2353,6 +2427,9 @@ void ReaderMifare(bool first_try) else { sync_cycles = sync_cycles + catch_up_cycles; if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles); + last_catch_up = 0; + catch_up_cycles = 0; + consecutive_resyncs = 0; } continue; } @@ -2360,12 +2437,10 @@ void ReaderMifare(bool first_try) consecutive_resyncs = 0; // Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding - if (ReaderReceive(receivedAnswer, receivedAnswerPar)) - { + if (ReaderReceive(receivedAnswer, receivedAnswerPar)) { catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer - if (nt_diff == 0) - { + if (nt_diff == 0) { par_low = par[0] & 0xE0; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change } @@ -2401,8 +2476,17 @@ void ReaderMifare(bool first_try) mf_nr_ar[3] &= 0x1F; - byte_t buf[28] = {0x00}; + if (isOK == -4) { + if (MF_DBGLEVEL >= 3) { + for (uint16_t i = 0; i <= MAX_STRATEGY; i++) { + for(uint16_t j = 0; j < NUM_DEBUG_INFOS; j++) { + Dbprintf("collected debug info[%d][%d] = %d", i, j, debug_info[i][j]); + } + } + } + } + byte_t buf[28]; memcpy(buf + 0, uid, 4); num_to_bytes(nt, 4, buf + 4); memcpy(buf + 8, par_list, 8); @@ -2418,8 +2502,7 @@ void ReaderMifare(bool first_try) set_tracing(FALSE); } - - /* +/** *MIFARE 1K simulate. * *@param flags : @@ -2949,6 +3032,8 @@ 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()); + + set_tracing(FALSE); } @@ -3107,4 +3192,5 @@ void RAMFUNC SniffMifare(uint8_t param) { MfSniffEnd(); LEDsoff(); Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len); + set_tracing(FALSE); }