X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f397b5cc874ac7d658173199d92c30f3f717a300..refs/pull/524/head:/client/mifarehost.c diff --git a/client/mifarehost.c b/client/mifarehost.c index aab1ae33..67277b59 100644 --- a/client/mifarehost.c +++ b/client/mifarehost.c @@ -1,197 +1,974 @@ -// Merlok, 2011 +// Merlok, 2011, 2012 // people from mifare@nethemba.com, 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. //----------------------------------------------------------------------------- -// High frequency ISO14443A commands +// mifare commands //----------------------------------------------------------------------------- +#include "mifarehost.h" + #include #include -#include "mifarehost.h" +#include +#include + +#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 -int compar_int(const void * a, const void * b) { - return (*(uint64_t*)b - *(uint64_t*)a); + +static int compare_uint64(const void *a, const void *b) { + // didn't work: (the result is truncated to 32 bits) + //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 return -1; } -// Compare countKeys structure -int compar_special_int(const void * a, const void * b) { - return (((countKeys *)b)->count - ((countKeys *)a)->count); + +// 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; } -countKeys * uniqsort(uint64_t * possibleKeys, uint32_t size) { - int i, j = 0; - int count = 0; - countKeys *our_counts; - - qsort(possibleKeys, size, sizeof (uint64_t), compar_int); - - our_counts = calloc(size, sizeof(countKeys)); - if (our_counts == NULL) { - PrintAndLog("Memory allocation error for our_counts"); - return NULL; + +// 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; + } } - - for (i = 0; i < size; i++) { - if (possibleKeys[i+1] == possibleKeys[i]) { - count++; + + 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 { - our_counts[j].key = possibleKeys[i]; - our_counts[j].count = count; - j++; - count=0; + 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; + } } } - qsort(our_counts, j, sizeof(countKeys), compar_special_int); - return (our_counts); + return foundAKey ? 0 : 3; +} + +// Compare 16 Bits out of cryptostate +int Compare16Bits(const void * a, const void * b) { + if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0; + else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1; + else return -1; +} + +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; + uint32_t keyType; + uint32_t nt; + uint32_t ks1; + } StateList_t; + + +// wrapper function for multi-threaded lfsr_recovery32 +void* nested_worker_thread(void *arg) +{ + struct Crypto1State *p1; + StateList_t *statelist = arg; + + 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 * resultKeys) +int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate) { - int i, m, len; - uint8_t isEOF; + uint16_t i; uint32_t uid; - fnVector * vector = NULL; - countKeys *ck; - int lenVector = 0; - UsbCommand * resp = NULL; - - memset(resultKeys, 0x00, 16 * 6); + UsbCommand resp; + + StateList_t statelists[2]; + struct Crypto1State *p1, *p2, *p3, *p4; // flush queue - while (WaitForResponseTimeout(CMD_ACK, 500) != NULL) ; - - UsbCommand c = {CMD_MIFARE_NESTED, {blockNo, keyType, trgBlockNo + trgKeyType * 0x100}}; + 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); + SendCommand(&c); - PrintAndLog("\n"); + if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) { + return -1; + } - // wait cycle - while (true) { - printf("."); - if (ukbhit()) { - getchar(); - printf("\naborted via keyboard!\n"); - break; - } + if (resp.arg[0]) { + return resp.arg[0]; // error during nested + } - resp = WaitForResponseTimeout(CMD_ACK, 1500); + 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); - if (resp != NULL) { - isEOF = resp->arg[0] & 0xff; + 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); + } - if (isEOF) break; - - len = resp->arg[1] & 0xff; - if (len == 0) continue; - - memcpy(&uid, resp->d.asBytes, 4); - PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, resp->arg[2] & 0xff, (resp->arg[2] >> 8) & 0xff); - vector = (fnVector *) realloc((void *)vector, (lenVector + len) * sizeof(fnVector) + 200); - if (vector == NULL) { - PrintAndLog("Memory allocation error for fnVector. len: %d bytes: %d", lenVector + len, (lenVector + len) * sizeof(fnVector)); - break; + // 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].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].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].tail.sltail) { + *p3 = *p1; + lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0); + p3++; + p1++; } - - for (i = 0; i < len; i++) { - vector[lenVector + i].blockNo = resp->arg[2] & 0xff; - vector[lenVector + i].keyType = (resp->arg[2] >> 8) & 0xff; - vector[lenVector + i].uid = uid; - - memcpy(&vector[lenVector + i].nt, (void *)(resp->d.asBytes + 8 + i * 8 + 0), 4); - memcpy(&vector[lenVector + i].ks1, (void *)(resp->d.asBytes + 8 + i * 8 + 4), 4); + savestate = *p2; + while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) { + *p4 = *p2; + lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0); + p4++; + p2++; } + } + else { + while (Compare16Bits(p1, p2) == -1) p1++; + while (Compare16Bits(p1, p2) == 1) p2++; + } + } + *(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].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); - lenVector += len; + 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].head.slhead + i, &key64); + num_to_bytes(key64, 6, keyBlock); + key64 = 0; + if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) { + num_to_bytes(key64, 6, resultKey); + break; } } - - if (!lenVector) { - PrintAndLog("Got 0 keys from proxmark."); + + free(statelists[0].head.slhead); + free(statelists[1].head.slhead); + + return 0; +} + +// EMULATOR + +int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) { + UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}}; + SendCommand(&c); + + UsbCommand resp; + if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1; + memcpy(data, resp.d.asBytes, blocksCount * 16); + return 0; +} + +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); + SendCommand(&c); + return 0; +} + +// "MAGIC" CARD + +int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { + uint8_t isOK = 0; + + UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}}; + SendCommand(&c); + + UsbCommand resp; + if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { + isOK = resp.arg[0] & 0xff; + memcpy(data, resp.d.asBytes, 16); + if (!isOK) return 2; + } else { + PrintAndLog("Command execute timeout"); return 1; } - printf("------------------------------------------------------------------\n"); - - // calc keys - struct Crypto1State* revstate = NULL; - struct Crypto1State* revstate_start = NULL; - uint64_t lfsr; - int kcount = 0; - pKeys *pk; + return 0; +} + +int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) { + + 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)) { + isOK = resp.arg[0] & 0xff; + 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; - if ((pk = (void *) malloc(sizeof(pKeys))) == NULL) return 1; - memset(pk, 0x00, sizeof(pKeys)); + 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; + } - for (m = 0; m < lenVector; m++) { - // And finally recover the first 32 bits of the key - revstate = lfsr_recovery32(vector[m].ks1, vector[m].nt ^ vector[m].uid); - if (revstate_start == NULL) revstate_start = revstate; + 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; + } - while ((revstate->odd != 0x0) || (revstate->even != 0x0)) { - lfsr_rollback_word(revstate, vector[m].nt ^ vector[m].uid, 0); - crypto1_get_lfsr(revstate, &lfsr); + return 0; +} - // Allocate a new space for keys - if (((kcount % MEM_CHUNK) == 0) || (kcount >= pk->size)) { - pk->size += MEM_CHUNK; -//fprintf(stdout, "New chunk by %d, sizeof %d\n", kcount, pk->size * sizeof(uint64_t)); - pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t)); - if (pk->possibleKeys == NULL) { - PrintAndLog("Memory allocation error for pk->possibleKeys"); - return 1; - } - } - pk->possibleKeys[kcount] = lfsr; - kcount++; - revstate++; +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[FILE_PATH_SIZE] = {0x00}; +static uint8_t traceCard[4096] = {0x00}; +static char traceFileName[FILE_PATH_SIZE] = {0x00}; +static int traceState = TRACE_IDLE; +static uint8_t traceCurBlock = 0; +static uint8_t traceCurKey = 0; + +struct Crypto1State *traceCrypto1 = NULL; + +struct Crypto1State *revstate; +uint64_t lfsr; +uint32_t ks2; +uint32_t ks3; + +uint32_t uid; // serial number +uint32_t nt; // tag challenge +uint32_t nr_enc; // encrypted reader challenge +uint32_t ar_enc; // encrypted reader response +uint32_t at_enc; // encrypted tag response + +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++) + if (traceCard[blockN * 16 + i] != 0) return 0; + + return 1; +} + +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] = {0x00}; + uint8_t buf8[64] = {0x00}; + int i, blockNum; + + 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."); + 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; } - free(revstate_start); - revstate_start = NULL; + for (i = 0; i < 32; i += 2) + sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]); + + memcpy(traceCard + blockNum * 16, buf8, 16); + blockNum++; } - - // Truncate - if (kcount != 0) { - pk->size = --kcount; - if ((pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t))) == NULL) { - PrintAndLog("Memory allocation error for pk->possibleKeys"); + fclose(f); + + return 0; +} + +int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) { + + if (traceCrypto1) + crypto1_destroy(traceCrypto1); + + traceCrypto1 = NULL; + + 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; +} + +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]; + } else { + 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, bool wantSaveToEmlFile) { + uint8_t data[64]; + + if (traceState == TRACE_ERROR) return 1; + if (len > 64) { + 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); + } + + switch (traceState) { + case TRACE_IDLE: + // check packet crc16! + if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) { + PrintAndLog("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; + traceCurBlock = data[1]; + traceCurKey = data[0] == 60 ? 1:0; + return 0; + } + + // READ + if ((len ==4) && ((data[0] == 0x30))) { + traceState = TRACE_READ_DATA; + traceCurBlock = data[1]; + return 0; + } + + // WRITE + if ((len ==4) && ((data[0] == 0xA0))) { + traceState = TRACE_WRITE_OK; + traceCurBlock = data[1]; + return 0; + } + + // HALT + if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) { + traceState = TRACE_ERROR; // do not decrypt the next commands + return 0; + } + + return 0; + break; + + case TRACE_READ_DATA: + if (len == 18) { + traceState = TRACE_IDLE; + + if (isBlockTrailer(traceCurBlock)) { + memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4); + } else { + memcpy(traceCard + traceCurBlock * 16, data, 16); + } + if (wantSaveToEmlFile) saveTraceCard(); + return 0; + } else { + traceState = TRACE_ERROR; + return 1; + } + break; + + case TRACE_WRITE_OK: + if ((len == 1) && (data[0] == 0x0a)) { + traceState = TRACE_WRITE_DATA; + + return 0; + } else { + traceState = TRACE_ERROR; + return 1; + } + break; + + case TRACE_WRITE_DATA: + if (len == 18) { + traceState = TRACE_IDLE; + + memcpy(traceCard + traceCurBlock * 16, data, 16); + if (wantSaveToEmlFile) saveTraceCard(); + return 0; + } else { + traceState = TRACE_ERROR; return 1; - } + } + break; + + case TRACE_AUTH1: + if (len == 4) { + traceState = TRACE_AUTH2; + nt = bytes_to_num(data, 4); + return 0; + } else { + traceState = TRACE_ERROR; + return 1; + } + break; + + 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); + return 0; + } else { + traceState = TRACE_ERROR; + return 1; + } + break; + + case TRACE_AUTH_OK: + 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); + + crypto1_get_lfsr(revstate, &lfsr); + printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF)); + 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 { + num_to_bytes(lfsr, 6, traceCard + blockShift); + } + if (wantSaveToEmlFile) saveTraceCard(); + + 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 + 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; + return 1; + } + break; + + default: + traceState = TRACE_ERROR; + return 1; } - PrintAndLog("Total keys count:%d", kcount); - ck = uniqsort(pk->possibleKeys, pk->size); + return 0; +} + +// DECODING - // fill key array - for (i = 0; i < 16 ; i++) { - num_to_bytes(ck[i].key, 6, (uint8_t*)(resultKeys + i * 6)); +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); - // finalize - free(pk->possibleKeys); - free(pk); - free(ck); - free(vector); + mf_crypto1_decrypt(traceCrypto1, data, len, 0); + PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) ); + crypto1_destroy(traceCrypto1); return 0; } -int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){ - *key = 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; - UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}}; - memcpy(c.d.asBytes, keyBlock, 6 * keycnt); + dist = malloc(2 << 16); + if(!dist) + return -1; - SendCommand(&c); + // 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); +} - UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 3000); +/* 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){ - if (resp == NULL) return 1; - if ((resp->arg[0] & 0xff) != 0x01) return 2; - *key = bytes_to_num(resp->d.asBytes, 6); - return 0; + 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); }