X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/9492e0b0986a557afe1c85f08fd02a7fb979f536..refs/pull/478/head:/client/mifarehost.c diff --git a/client/mifarehost.c b/client/mifarehost.c index 03951e2d..67277b59 100644 --- a/client/mifarehost.c +++ b/client/mifarehost.c @@ -8,25 +8,265 @@ // mifare commands //----------------------------------------------------------------------------- +#include "mifarehost.h" + #include -#include +#include #include #include -#include "mifarehost.h" -#include "proxmark3.h" -// MIFARE -int compar_int(const void * a, const void * b) { +#include "crapto1/crapto1.h" +#include "proxmark3.h" +#include "usb_cmd.h" +#include "cmdmain.h" +#include "ui.h" +#include "util.h" +#include "iso14443crc.h" + +#include "mifare.h" + +// mifare tracer flags used in mfTraceDecode() +#define TRACE_IDLE 0x00 +#define TRACE_AUTH1 0x01 +#define TRACE_AUTH2 0x02 +#define TRACE_AUTH_OK 0x03 +#define TRACE_READ_DATA 0x04 +#define TRACE_WRITE_OK 0x05 +#define TRACE_WRITE_DATA 0x06 +#define TRACE_ERROR 0xFF + + +static int compare_uint64(const void *a, const void *b) { // didn't work: (the result is truncated to 32 bits) - //return (*(uint64_t*)b - *(uint64_t*)a); + //return (*(int64_t*)b - *(int64_t*)a); // better: if (*(uint64_t*)b == *(uint64_t*)a) return 0; - else if (*(uint64_t*)b > *(uint64_t*)a) return 1; + else if (*(uint64_t*)b < *(uint64_t*)a) return 1; else return -1; } +// create the intersection (common members) of two sorted lists. Lists are terminated by -1. Result will be in list1. Number of elements is returned. +static uint32_t intersection(uint64_t *list1, uint64_t *list2) +{ + if (list1 == NULL || list2 == NULL) { + return 0; + } + uint64_t *p1, *p2, *p3; + p1 = p3 = list1; + p2 = list2; + + while ( *p1 != -1 && *p2 != -1 ) { + if (compare_uint64(p1, p2) == 0) { + *p3++ = *p1++; + p2++; + } + else { + while (compare_uint64(p1, p2) < 0) ++p1; + while (compare_uint64(p1, p2) > 0) ++p2; + } + } + *p3 = -1; + return p3 - list1; +} + + +// Darkside attack (hf mf mifare) +static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t **keys) { + struct Crypto1State *states; + uint32_t i, pos, rr; //nr_diff; + uint8_t bt, ks3x[8], par[8][8]; + uint64_t key_recovered; + static uint64_t *keylist; + rr = 0; + + // Reset the last three significant bits of the reader nonce + nr &= 0xffffff1f; + + for (pos=0; pos<8; pos++) { + ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f; + bt = (par_info >> (pos*8)) & 0xff; + for (i=0; i<8; i++) { + par[7-pos][i] = (bt >> i) & 0x01; + } + } + + states = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0)); + + if (states == NULL) { + *keys = NULL; + return 0; + } + + keylist = (uint64_t*)states; + + for (i = 0; keylist[i]; i++) { + lfsr_rollback_word(states+i, uid^nt, 0); + crypto1_get_lfsr(states+i, &key_recovered); + keylist[i] = key_recovered; + } + keylist[i] = -1; + + *keys = keylist; + return i; +} + + +int mfDarkside(uint64_t *key) +{ + uint32_t uid = 0; + uint32_t nt = 0, nr = 0; + uint64_t par_list = 0, ks_list = 0; + uint64_t *keylist = NULL, *last_keylist = NULL; + uint32_t keycount = 0; + int16_t isOK = 0; + + UsbCommand c = {CMD_READER_MIFARE, {true, 0, 0}}; + + // message + printf("-------------------------------------------------------------------------\n"); + printf("Executing command. Expected execution time: 25sec on average\n"); + printf("Press button on the proxmark3 device to abort both proxmark3 and client.\n"); + printf("-------------------------------------------------------------------------\n"); + + + while (true) { + clearCommandBuffer(); + SendCommand(&c); + + //flush queue + while (ukbhit()) { + int c = getchar(); (void) c; + } + + // wait cycle + while (true) { + printf("."); + fflush(stdout); + if (ukbhit()) { + return -5; + break; + } + + UsbCommand resp; + if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) { + isOK = resp.arg[0]; + if (isOK < 0) { + return isOK; + } + uid = (uint32_t)bytes_to_num(resp.d.asBytes + 0, 4); + nt = (uint32_t)bytes_to_num(resp.d.asBytes + 4, 4); + par_list = bytes_to_num(resp.d.asBytes + 8, 8); + ks_list = bytes_to_num(resp.d.asBytes + 16, 8); + nr = bytes_to_num(resp.d.asBytes + 24, 4); + break; + } + } + + if (par_list == 0 && c.arg[0] == true) { + PrintAndLog("Parity is all zero. Most likely this card sends NACK on every failed authentication."); + PrintAndLog("Attack will take a few seconds longer because we need two consecutive successful runs."); + } + c.arg[0] = false; + + keycount = nonce2key(uid, nt, nr, par_list, ks_list, &keylist); + + if (keycount == 0) { + PrintAndLog("Key not found (lfsr_common_prefix list is null). Nt=%08x", nt); + PrintAndLog("This is expected to happen in 25%% of all cases. Trying again with a different reader nonce..."); + continue; + } + + qsort(keylist, keycount, sizeof(*keylist), compare_uint64); + keycount = intersection(last_keylist, keylist); + if (keycount == 0) { + free(last_keylist); + last_keylist = keylist; + continue; + } + + if (keycount > 1) { + PrintAndLog("Found %u possible keys. Trying to authenticate with each of them ...\n", keycount); + } else { + PrintAndLog("Found a possible key. Trying to authenticate...\n"); + } + + *key = -1; + uint8_t keyBlock[USB_CMD_DATA_SIZE]; + int max_keys = USB_CMD_DATA_SIZE/6; + for (int i = 0; i < keycount; i += max_keys) { + int size = keycount - i > max_keys ? max_keys : keycount - i; + for (int j = 0; j < size; j++) { + if (last_keylist == NULL) { + num_to_bytes(keylist[i*max_keys + j], 6, keyBlock); + } else { + num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock); + } + } + if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) { + break; + } + } + + if (*key != -1) { + free(last_keylist); + free(keylist); + break; + } else { + PrintAndLog("Authentication failed. Trying again..."); + free(last_keylist); + last_keylist = keylist; + } + } + + return 0; +} + + +int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){ + + *key = -1; + + UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType & 0xff) << 8)), clear_trace, keycnt}}; + memcpy(c.d.asBytes, keyBlock, 6 * keycnt); + SendCommand(&c); + + UsbCommand resp; + if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1; + if ((resp.arg[0] & 0xff) != 0x01) return 2; + *key = bytes_to_num(resp.d.asBytes, 6); + return 0; +} + +int mfCheckKeysSec(uint8_t sectorCnt, uint8_t keyType, uint8_t timeout14a, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, sector_t * e_sector){ + + uint8_t keyPtr = 0; + + if (e_sector == NULL) + return -1; + + UsbCommand c = {CMD_MIFARE_CHKKEYS, {((sectorCnt & 0xff) | ((keyType & 0xff) << 8)), (clear_trace | 0x02)|((timeout14a & 0xff) << 8), keycnt}}; + memcpy(c.d.asBytes, keyBlock, 6 * keycnt); + SendCommand(&c); + + UsbCommand resp; + if (!WaitForResponseTimeoutW(CMD_ACK, &resp, MAX(3000, 1000 + 13 * sectorCnt * keycnt * (keyType == 2 ? 2 : 1)), false)) return 1; // timeout: 13 ms / fail auth + if ((resp.arg[0] & 0xff) != 0x01) return 2; + + bool foundAKey = false; + for(int sec = 0; sec < sectorCnt; sec++){ + for(int keyAB = 0; keyAB < 2; keyAB++){ + keyPtr = *(resp.d.asBytes + keyAB * 40 + sec); + if (keyPtr){ + e_sector[sec].foundKey[keyAB] = true; + e_sector[sec].Key[keyAB] = bytes_to_num(keyBlock + (keyPtr - 1) * 6, 6); + foundAKey = true; + } + } + } + return foundAKey ? 0 : 3; +} // Compare 16 Bits out of cryptostate int Compare16Bits(const void * a, const void * b) { @@ -35,17 +275,16 @@ int Compare16Bits(const void * a, const void * b) { else return -1; } - -typedef +typedef struct { union { struct Crypto1State *slhead; uint64_t *keyhead; - }; + } head; union { struct Crypto1State *sltail; uint64_t *keytail; - }; + } tail; uint32_t len; uint32_t uid; uint32_t blockNo; @@ -61,88 +300,82 @@ void* nested_worker_thread(void *arg) struct Crypto1State *p1; StateList_t *statelist = arg; - statelist->slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid); - for (p1 = statelist->slhead; *(uint64_t *)p1 != 0; p1++); - statelist->len = p1 - statelist->slhead; - statelist->sltail = --p1; - qsort(statelist->slhead, statelist->len, sizeof(uint64_t), Compare16Bits); - - return statelist->slhead; -} - - + statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid); + for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++); + statelist->len = p1 - statelist->head.slhead; + statelist->tail.sltail = --p1; + qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits); + return statelist->head.slhead; +} -int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) +int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate) { - uint16_t i, len; + uint16_t i; uint32_t uid; UsbCommand resp; - StateList_t statelists[2]; struct Crypto1State *p1, *p2, *p3, *p4; - + // flush queue - WaitForResponseTimeout(CMD_ACK,NULL,100); - + WaitForResponseTimeout(CMD_ACK, NULL, 100); + UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}}; memcpy(c.d.asBytes, key, 6); SendCommand(&c); - if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { - len = resp.arg[1]; - if (len == 2) { - memcpy(&uid, resp.d.asBytes, 4); - PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8); - - for (i = 0; i < 2; i++) { - statelists[i].blockNo = resp.arg[2] & 0xff; - statelists[i].keyType = (resp.arg[2] >> 8) & 0xff; - statelists[i].uid = uid; - - memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4); - memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4); - } - } - else { - PrintAndLog("Got 0 keys from proxmark."); - return 1; - } + if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) { + return -1; } - + + if (resp.arg[0]) { + return resp.arg[0]; // error during nested + } + + memcpy(&uid, resp.d.asBytes, 4); + PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8); + + for (i = 0; i < 2; i++) { + statelists[i].blockNo = resp.arg[2] & 0xff; + statelists[i].keyType = (resp.arg[2] >> 8) & 0xff; + statelists[i].uid = uid; + memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4); + memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4); + } + // calc keys - + pthread_t thread_id[2]; - + // create and run worker threads for (i = 0; i < 2; i++) { pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]); } - + // wait for threads to terminate: for (i = 0; i < 2; i++) { - pthread_join(thread_id[i], (void*)&statelists[i].slhead); + pthread_join(thread_id[i], (void*)&statelists[i].head.slhead); } // the first 16 Bits of the cryptostate already contain part of our key. // Create the intersection of the two lists based on these 16 Bits and // roll back the cryptostate - p1 = p3 = statelists[0].slhead; - p2 = p4 = statelists[1].slhead; - while (p1 <= statelists[0].sltail && p2 <= statelists[1].sltail) { + p1 = p3 = statelists[0].head.slhead; + p2 = p4 = statelists[1].head.slhead; + while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) { if (Compare16Bits(p1, p2) == 0) { struct Crypto1State savestate, *savep = &savestate; savestate = *p1; - while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].sltail) { + while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) { *p3 = *p1; lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0); p3++; p1++; } savestate = *p2; - while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].sltail) { + while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) { *p4 = *p2; lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0); p4++; @@ -154,66 +387,36 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo while (Compare16Bits(p1, p2) == 1) p2++; } } - p3->even = 0; p3->odd = 0; - p4->even = 0; p4->odd = 0; - statelists[0].len = p3 - statelists[0].slhead; - statelists[1].len = p4 - statelists[1].slhead; - statelists[0].sltail=--p3; - statelists[1].sltail=--p4; + *(uint64_t*)p3 = -1; + *(uint64_t*)p4 = -1; + statelists[0].len = p3 - statelists[0].head.slhead; + statelists[1].len = p4 - statelists[1].head.slhead; + statelists[0].tail.sltail=--p3; + statelists[1].tail.sltail=--p4; // the statelists now contain possible keys. The key we are searching for must be in the // intersection of both lists. Create the intersection: - qsort(statelists[0].keyhead, statelists[0].len, sizeof(uint64_t), compar_int); - qsort(statelists[1].keyhead, statelists[1].len, sizeof(uint64_t), compar_int); - - uint64_t *p5, *p6, *p7; - p5 = p7 = statelists[0].keyhead; - p6 = statelists[1].keyhead; - while (p5 <= statelists[0].keytail && p6 <= statelists[1].keytail) { - if (compar_int(p5, p6) == 0) { - *p7++ = *p5++; - p6++; - } - else { - while (compar_int(p5, p6) == -1) p5++; - while (compar_int(p5, p6) == 1) p6++; - } - } - statelists[0].len = p7 - statelists[0].keyhead; - statelists[0].keytail=--p7; + qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compare_uint64); + qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compare_uint64); + statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead); memset(resultKey, 0, 6); // The list may still contain several key candidates. Test each of them with mfCheckKeys for (i = 0; i < statelists[0].len; i++) { uint8_t keyBlock[6]; uint64_t key64; - crypto1_get_lfsr(statelists[0].slhead + i, &key64); + crypto1_get_lfsr(statelists[0].head.slhead + i, &key64); num_to_bytes(key64, 6, keyBlock); key64 = 0; - if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, 1, keyBlock, &key64)) { + if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) { num_to_bytes(key64, 6, resultKey); break; } } - - free(statelists[0].slhead); - free(statelists[1].slhead); - - return 0; -} - -int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){ - *key = 0; - - UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}}; - memcpy(c.d.asBytes, keyBlock, 6 * keycnt); - SendCommand(&c); + free(statelists[0].head.slhead); + free(statelists[1].head.slhead); - UsbCommand resp; - if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1; - if ((resp.arg[0] & 0xff) != 0x01) return 2; - *key = bytes_to_num(resp.d.asBytes, 6); return 0; } @@ -231,37 +434,23 @@ int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) { int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) { UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}}; - memcpy(c.d.asBytes, data, blocksCount * 16); + memcpy(c.d.asBytes, data, blocksCount * 16); SendCommand(&c); return 0; } // "MAGIC" CARD -int mfCSetUID(uint8_t *uid, uint8_t *oldUID, int wantWipe) { - uint8_t block0[16]; - memset(block0, 0, 16); - memcpy(block0, uid, 4); - block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC - // mifare classic SAK(byte 5) and ATQA(byte 6 and 7) - block0[5] = 0x88; - block0[6] = 0x04; - block0[7] = 0x00; - - return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER); -} - -int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint8_t params) { +int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { uint8_t isOK = 0; - UsbCommand c = {CMD_MIFARE_EML_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}}; - memcpy(c.d.asBytes, data, 16); + UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}}; SendCommand(&c); - UsbCommand resp; + UsbCommand resp; if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { isOK = resp.arg[0] & 0xff; - if (uid != NULL) memcpy(uid, resp.d.asBytes, 4); + memcpy(data, resp.d.asBytes, 16); if (!isOK) return 2; } else { PrintAndLog("Command execute timeout"); @@ -270,33 +459,113 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint return 0; } -int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { - uint8_t isOK = 0; +int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) { - UsbCommand c = {CMD_MIFARE_EML_CGETBLOCK, {params, 0, blockNo}}; + uint8_t isOK = 0; + UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}}; + memcpy(c.d.asBytes, data, 16); SendCommand(&c); - UsbCommand resp; - if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { + UsbCommand resp; + if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) { isOK = resp.arg[0] & 0xff; - memcpy(data, resp.d.asBytes, 16); - if (!isOK) return 2; + if (uid != NULL) + memcpy(uid, resp.d.asBytes, 4); + if (!isOK) + return 2; } else { PrintAndLog("Command execute timeout"); return 1; } + + return 0; +} + +int mfCWipe(uint32_t numSectors, bool gen1b, bool wantWipe, bool wantFill) { + uint8_t isOK = 0; + uint8_t cmdParams = wantWipe + wantFill * 0x02 + gen1b * 0x04; + UsbCommand c = {CMD_MIFARE_CWIPE, {numSectors, cmdParams, 0}}; + SendCommand(&c); + + UsbCommand resp; + WaitForResponse(CMD_ACK,&resp); + isOK = resp.arg[0] & 0xff; + + return isOK; +} + +int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID) { + uint8_t oldblock0[16] = {0x00}; + uint8_t block0[16] = {0x00}; + int gen = 0, res; + + gen = mfCIdentify(); + + /* generation 1a magic card by default */ + uint8_t cmdParams = CSETBLOCK_SINGLE_OPER; + if (gen == 2) { + /* generation 1b magic card */ + cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B; + } + + res = mfCGetBlock(0, oldblock0, cmdParams); + + if (res == 0) { + memcpy(block0, oldblock0, 16); + PrintAndLog("old block 0: %s", sprint_hex(block0,16)); + } else { + PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0."); + } + + // fill in the new values + // UID + memcpy(block0, uid, 4); + // Mifare UID BCC + block0[4] = block0[0] ^ block0[1] ^ block0[2] ^ block0[3]; + // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed) + if (sak != NULL) + block0[5] = sak[0]; + if (atqa != NULL) { + block0[6] = atqa[1]; + block0[7] = atqa[0]; + } + PrintAndLog("new block 0: %s", sprint_hex(block0, 16)); + + res = mfCSetBlock(0, block0, oldUID, false, cmdParams); + if (res) { + PrintAndLog("Can't set block 0. Error: %d", res); + return res; + } + return 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; + switch( isGeneration ){ + case 1: PrintAndLog("Chinese magic backdoor commands (GEN 1a) detected"); break; + case 2: PrintAndLog("Chinese magic backdoor command (GEN 1b) detected"); break; + default: PrintAndLog("No chinese magic backdoor command detected"); break; + } + + return (int) isGeneration; +} + + // SNIFFER // constants static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00}; // variables -char logHexFileName[200] = {0x00}; +char logHexFileName[FILE_PATH_SIZE] = {0x00}; static uint8_t traceCard[4096] = {0x00}; -static char traceFileName[20]; +static char traceFileName[FILE_PATH_SIZE] = {0x00}; static int traceState = TRACE_IDLE; static uint8_t traceCurBlock = 0; static uint8_t traceCurKey = 0; @@ -310,19 +579,16 @@ uint32_t ks3; uint32_t uid; // serial number uint32_t nt; // tag challenge -uint32_t nt_par; uint32_t nr_enc; // encrypted reader challenge uint32_t ar_enc; // encrypted reader response -uint32_t nr_ar_par; uint32_t at_enc; // encrypted tag response -uint32_t at_par; int isTraceCardEmpty(void) { return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0)); } int isBlockEmpty(int blockN) { - for (int i = 0; i < 16; i++) + for (int i = 0; i < 16; i++) if (traceCard[blockN * 16 + i] != 0) return 0; return 1; @@ -332,31 +598,55 @@ int isBlockTrailer(int blockN) { return ((blockN & 0x03) == 0x03); } +int saveTraceCard(void) { + FILE * f; + + if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0; + + f = fopen(traceFileName, "w+"); + if ( !f ) return 1; + + 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"); + } + fclose(f); + return 0; +} + int loadTraceCard(uint8_t *tuid) { FILE * f; - char buf[64]; - uint8_t buf8[64]; + char buf[64] = {0x00}; + uint8_t buf8[64] = {0x00}; int i, blockNum; - - if (!isTraceCardEmpty()) saveTraceCard(); + + if (!isTraceCardEmpty()) + saveTraceCard(); + memset(traceCard, 0x00, 4096); memcpy(traceCard, tuid + 3, 4); + FillFileNameByUID(traceFileName, tuid, ".eml", 7); f = fopen(traceFileName, "r"); if (!f) return 1; - + blockNum = 0; + while(!feof(f)){ + memset(buf, 0, sizeof(buf)); if (fgets(buf, sizeof(buf), f) == NULL) { - PrintAndLog("File reading error."); + PrintAndLog("File reading error."); + fclose(f); return 2; - } + } if (strlen(buf) < 32){ if (feof(f)) break; PrintAndLog("File content error. Block data must include 32 HEX symbols"); + fclose(f); return 2; } for (i = 0; i < 32; i += 2) @@ -371,34 +661,22 @@ int loadTraceCard(uint8_t *tuid) { return 0; } -int saveTraceCard(void) { - FILE * f; - - if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0; - - f = fopen(traceFileName, "w+"); - 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"); - } - fclose(f); - - return 0; -} - int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) { - if (traceCrypto1) crypto1_destroy(traceCrypto1); + if (traceCrypto1) + crypto1_destroy(traceCrypto1); + traceCrypto1 = NULL; - if (wantSaveToEmlFile) loadTraceCard(tuid); + if (wantSaveToEmlFile) + loadTraceCard(tuid); + traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3]; traceCard[5] = sak; memcpy(&traceCard[6], atqa, 2); traceCurBlock = 0; uid = bytes_to_num(tuid + 3, 4); - + traceState = TRACE_IDLE; return 0; @@ -407,7 +685,7 @@ int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFil void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){ uint8_t bt = 0; int i; - + if (len != 1) { for (i = 0; i < len; i++) data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i]; @@ -415,14 +693,14 @@ void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool i bt = 0; for (i = 0; i < 4; i++) bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i; - + data[0] = bt; } return; } -int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEmlFile) { +int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { uint8_t data[64]; if (traceState == TRACE_ERROR) return 1; @@ -430,24 +708,24 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm traceState = TRACE_ERROR; return 1; } - + memcpy(data, data_src, len); if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) { mf_crypto1_decrypt(traceCrypto1, data, len, 0); PrintAndLog("dec> %s", sprint_hex(data, len)); - AddLogHex(logHexFileName, "dec> ", data, len); + AddLogHex(logHexFileName, "dec> ", data, len); } - + switch (traceState) { - case TRACE_IDLE: + case TRACE_IDLE: // check packet crc16! if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) { PrintAndLog("dec> CRC ERROR!!!"); - AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); + AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); traceState = TRACE_ERROR; // do not decrypt the next commands return 1; } - + // AUTHENTICATION if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) { traceState = TRACE_AUTH1; @@ -475,11 +753,11 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm traceState = TRACE_ERROR; // do not decrypt the next commands return 0; } - + return 0; break; - - case TRACE_READ_DATA: + + case TRACE_READ_DATA: if (len == 18) { traceState = TRACE_IDLE; @@ -496,8 +774,8 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm } break; - case TRACE_WRITE_OK: - if ((len == 1) && (data[0] = 0x0a)) { + case TRACE_WRITE_OK: + if ((len == 1) && (data[0] == 0x0a)) { traceState = TRACE_WRITE_DATA; return 0; @@ -507,7 +785,7 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm } break; - case TRACE_WRITE_DATA: + case TRACE_WRITE_DATA: if (len == 18) { traceState = TRACE_IDLE; @@ -520,12 +798,10 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm } break; - case TRACE_AUTH1: + case TRACE_AUTH1: if (len == 4) { traceState = TRACE_AUTH2; - nt = bytes_to_num(data, 4); - nt_par = parity; return 0; } else { traceState = TRACE_ERROR; @@ -533,13 +809,12 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm } break; - case TRACE_AUTH2: + case TRACE_AUTH2: if (len == 8) { traceState = TRACE_AUTH_OK; nr_enc = bytes_to_num(data, 4); ar_enc = bytes_to_num(data + 4, 4); - nr_ar_par = parity; return 0; } else { traceState = TRACE_ERROR; @@ -547,38 +822,28 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm } break; - case TRACE_AUTH_OK: + case TRACE_AUTH_OK: if (len ==4) { traceState = TRACE_IDLE; at_enc = bytes_to_num(data, 4); - at_par = parity; - + // decode key here) - if (!traceCrypto1) { - 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); - }else{ - 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); - } + 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); - + AddLogUint64(logHexFileName, "key> ", lfsr); + int blockShift = ((traceCurBlock & 0xFC) + 3) * 16; if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4); - + if (traceCurKey) { num_to_bytes(lfsr, 6, traceCard + blockShift + 10); } else { @@ -589,10 +854,10 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm if (traceCrypto1) { crypto1_destroy(traceCrypto1); } - + // set cryptosystem state traceCrypto1 = lfsr_recovery64(ks2, ks3); - + // nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt; /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr @@ -600,7 +865,7 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm crypto1_word(traceCrypto1, ar, 1); crypto1_word(traceCrypto1, 0, 0); crypto1_word(traceCrypto1, 0, 0);*/ - + return 0; } else { traceState = TRACE_ERROR; @@ -608,10 +873,102 @@ int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEm } break; - default: + default: traceState = TRACE_ERROR; return 1; } return 0; } + +// DECODING + +int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){ + /* + uint32_t nt; // tag challenge + uint32_t ar_enc; // encrypted reader response + uint32_t at_enc; // encrypted tag response + */ + if (traceCrypto1) { + crypto1_destroy(traceCrypto1); + } + ks2 = ar_enc ^ prng_successor(nt, 64); + ks3 = at_enc ^ prng_successor(nt, 96); + traceCrypto1 = lfsr_recovery64(ks2, ks3); + + mf_crypto1_decrypt(traceCrypto1, data, len, 0); + + PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) ); + crypto1_destroy(traceCrypto1); + 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); +}