X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/61972abbdd0a03832cae7d5ae58548fed11e619e..f1f1aceabab9e21e98a415c0db57b09931cc9c84:/armsrc/iso14443a.c?ds=sidebyside diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index a7102168..0431876e 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -141,16 +141,40 @@ const uint8_t OddByteParity[256] = { 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1 }; + void iso14a_set_trigger(bool enable) { trigger = enable; } - void iso14a_set_timeout(uint32_t timeout) { iso14a_timeout = timeout; + if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", iso14a_timeout, iso14a_timeout / 106); } + +void iso14a_set_ATS_timeout(uint8_t *ats) { + + uint8_t tb1; + uint8_t fwi; + uint32_t fwt; + + if (ats[0] > 1) { // there is a format byte T0 + if ((ats[1] & 0x20) == 0x20) { // there is an interface byte TB(1) + if ((ats[1] & 0x10) == 0x10) { // there is an interface byte TA(1) preceding TB(1) + tb1 = ats[3]; + } else { + tb1 = ats[2]; + } + fwi = (tb1 & 0xf0) >> 4; // frame waiting indicator (FWI) + fwt = 256 * 16 * (1 << fwi); // frame waiting time (FWT) in 1/fc + + iso14a_set_timeout(fwt/(8*16)); + } + } +} + + //----------------------------------------------------------------------------- // Generate the parity value for a byte sequence // @@ -527,12 +551,8 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { LEDsoff(); - // We won't start recording the frames that we acquire until we trigger; - // a good trigger condition to get started is probably when we see a - // response from the tag. - // triggered == FALSE -- to wait first for card - bool triggered = !(param & 0x03); - + iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); + // Allocate memory from BigBuf for some buffers // free all previous allocations first BigBuf_free(); @@ -559,8 +579,6 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { bool TagIsActive = FALSE; bool ReaderIsActive = FALSE; - iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); - // Set up the demodulator for tag -> reader responses. DemodInit(receivedResponse, receivedResponsePar); @@ -570,6 +588,12 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { // Setup and start DMA. FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); + // We won't start recording the frames that we acquire until we trigger; + // a good trigger condition to get started is probably when we see a + // response from the tag. + // triggered == FALSE -- to wait first for card + bool triggered = !(param & 0x03); + // And now we loop, receiving samples. for(uint32_t rsamples = 0; TRUE; ) { @@ -1002,6 +1026,9 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) .modulation_n = 0 }; + // We need to listen to the high-frequency, peak-detected path. + iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); + BigBuf_free_keep_EM(); // allocate buffers: @@ -1030,16 +1057,12 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) int happened2 = 0; int cmdsRecvd = 0; - // We need to listen to the high-frequency, peak-detected path. - iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); - cmdsRecvd = 0; tag_response_info_t* p_response; LED_A_ON(); for(;;) { // Clean receive command buffer - if(!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) { DbpString("Button press"); break; @@ -1600,7 +1623,7 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receive if(ManchesterDecoding(b, offset, 0)) { NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD); return TRUE; - } else if (c++ > iso14a_timeout) { + } else if (c++ > iso14a_timeout && Demod.state == DEMOD_UNSYNCD) { return FALSE; } } @@ -1798,6 +1821,10 @@ int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, u // reset the PCB block number iso14_pcb_blocknum = 0; + + // set default timeout based on ATS + iso14a_set_ATS_timeout(resp); + return 1; } @@ -1862,8 +1889,9 @@ void ReaderIso14443a(UsbCommand *c) { iso14a_command_t param = c->arg[0]; uint8_t *cmd = c->d.asBytes; - size_t len = c->arg[1]; - size_t lenbits = c->arg[2]; + size_t len = c->arg[1] & 0xffff; + size_t lenbits = c->arg[1] >> 16; + uint32_t timeout = c->arg[2]; uint32_t arg0 = 0; byte_t buf[USB_CMD_DATA_SIZE]; uint8_t par[MAX_PARITY_SIZE]; @@ -1888,7 +1916,7 @@ void ReaderIso14443a(UsbCommand *c) } if(param & ISO14A_SET_TIMEOUT) { - iso14a_set_timeout(c->arg[2]); + iso14a_set_timeout(timeout); } if(param & ISO14A_APDU) { @@ -1942,7 +1970,7 @@ int32_t dist_nt(uint32_t nt1, uint32_t nt2) { nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i; nttmp2 = prng_successor(nttmp2, 1); - if (nttmp2 == nt1) return -i; + if (nttmp2 == nt1) return -i; } return(-99999); // either nt1 or nt2 are invalid nonces @@ -1965,6 +1993,10 @@ void ReaderMifare(bool first_try) uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE]; uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE]; + if (first_try) { + iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); + } + // free eventually allocated BigBuf memory. We want all for tracing. BigBuf_free(); @@ -1984,6 +2016,7 @@ 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; static uint32_t sync_cycles; int catch_up_cycles = 0; @@ -1993,9 +2026,8 @@ void ReaderMifare(bool first_try) if (first_try) { mf_nr_ar3 = 0; - iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); 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; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the tag nonces). nt_attacked = 0; nt = 0; par[0] = 0; @@ -2011,33 +2043,44 @@ void ReaderMifare(bool first_try) LED_B_OFF(); LED_C_OFF(); - + + #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 16 + uint16_t unexpected_random = 0; + uint16_t sync_tries = 0; + int16_t debug_info_nr = -1; + uint32_t debug_info[MAX_SYNC_TRIES]; + for(uint16_t i = 0; TRUE; i++) { + LED_C_ON(); WDT_HIT(); // Test if the action was cancelled if(BUTTON_PRESS()) { + isOK = -1; break; } - LED_C_ON(); - if(!iso14443a_select_card(uid, NULL, &cuid)) { if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card"); continue; } - sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; - catch_up_cycles = 0; + 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) { + 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 { + ReaderTransmit(mf_auth, sizeof(mf_auth), NULL); + } // Receive the (4 Byte) "random" nonce if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) { @@ -2055,13 +2098,32 @@ void ReaderMifare(bool first_try) int nt_distance = dist_nt(previous_nt, nt); if (nt_distance == 0) { nt_attacked = nt; - } - else { - if (nt_distance == -99999) { // invalid nonce received, try again - continue; + } else { + if (nt_distance == -99999) { // invalid nonce received + unexpected_random++; + if (!nt_attacked && unexpected_random > MAX_UNEXPECTED_RANDOM) { + isOK = -3; // Card has an unpredictable PRNG. Give up + break; + } else { + continue; // continue trying... + } + } + if (++sync_tries > MAX_SYNC_TRIES) { + if (sync_tries > 2 * MAX_SYNC_TRIES) { + 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[++debug_info_nr] = nt_distance; + continue; + } } 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_cycles <= 0) { + sync_cycles += PRNG_SEQUENCE_LENGTH; + } + if (MF_DBGLEVEL >= 3) { + Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles); + } continue; } } @@ -2120,6 +2182,10 @@ void ReaderMifare(bool first_try) if (nt_diff == 0 && first_try) { par[0]++; + if (par[0] == 0x00) { // tried all 256 possible parities without success. Card doesn't send NACK. + isOK = -2; + break; + } } else { par[0] = ((par[0] & 0x1F) + 1) | par_low; } @@ -2128,6 +2194,14 @@ void ReaderMifare(bool first_try) mf_nr_ar[3] &= 0x1F; + + if (isOK == -4) { + if (MF_DBGLEVEL >= 3) { + for(uint16_t i = 0; i < MAX_SYNC_TRIES; i++) { + Dbprintf("collected debug info[%d] = %d\n", i, debug_info[i]); + } + } + } byte_t buf[28]; memcpy(buf + 0, uid, 4); @@ -2136,7 +2210,7 @@ void ReaderMifare(bool first_try) memcpy(buf + 16, ks_list, 8); memcpy(buf + 24, mf_nr_ar, 4); - cmd_send(CMD_ACK,isOK,0,0,buf,28); + cmd_send(CMD_ACK, isOK, 0, 0, buf, 28); // Thats it... FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); @@ -2197,13 +2271,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0}; uint8_t ar_nr_collected = 0; - // free eventually allocated BigBuf memory but keep Emulator Memory - BigBuf_free_keep_EM(); - - // clear trace - clear_trace(); - set_tracing(TRUE); - // Authenticate response - nonce uint32_t nonce = bytes_to_num(rAUTH_NT, 4); @@ -2241,13 +2308,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (_7BUID) { rATQA[0] = 0x44; rUIDBCC1[0] = 0x88; + rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; } - // We need to listen to the high-frequency, peak-detected path. - iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); - - if (MF_DBGLEVEL >= 1) { if (!_7BUID) { Dbprintf("4B UID: %02x%02x%02x%02x", @@ -2259,6 +2323,17 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } } + // We need to listen to the high-frequency, peak-detected path. + iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); + + // free eventually allocated BigBuf memory but keep Emulator Memory + BigBuf_free_keep_EM(); + + // clear trace + clear_trace(); + set_tracing(TRUE); + + bool finished = FALSE; while (!BUTTON_PRESS() && !finished) { WDT_HIT(); @@ -2480,13 +2555,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * || receivedCmd[0] == 0xB0) { // transfer if (receivedCmd[1] >= 16 * 4) { EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); - if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]); + if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]); break; } if (receivedCmd[1] / 4 != cardAUTHSC) { EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); - if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC); + if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC); break; } } @@ -2677,10 +2752,8 @@ void RAMFUNC SniffMifare(uint8_t param) { uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE]; uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE]; - // As we receive stuff, we copy it from receivedCmd or receivedResponse - // into trace, along with its length and other annotations. - //uint8_t *trace = (uint8_t *)BigBuf; - + iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); + // free eventually allocated BigBuf memory BigBuf_free(); // allocate the DMA buffer, used to stream samples from the FPGA @@ -2692,8 +2765,6 @@ void RAMFUNC SniffMifare(uint8_t param) { bool ReaderIsActive = FALSE; bool TagIsActive = FALSE; - iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); - // Set up the demodulator for tag -> reader responses. DemodInit(receivedResponse, receivedResponsePar);