RfidResearchGroup/proxmark3
1
1
Fork 0
mirror of https://github.com/RfidResearchGroup/proxmark3.git synced 2024-09-20 23:36:31 +08:00
Code Issues Packages Projects Releases Wiki Activity
proxmark3/client/mifarehost.c
iceman1001 29c15b3480 cHG.. missing
2018-01-29 13:48:18 +01:00

974 lines
28 KiB
C
Raw Blame History

// 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.
//-----------------------------------------------------------------------------
// mifare commands
//-----------------------------------------------------------------------------
#include "mifarehost.h"
int mfDarkside(uint8_t blockno, uint8_t key_type, 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, blockno, key_type}};
// message
printf("----------------------------------------------------------------------------\n");
printf("Executing command. Expected execution time: 25sec on average\n");
printf("Press pm3-button on the proxmark3 device to abort both proxmark3 and client.\n");
printf("----------------------------------------------------------------------------\n");
while (true) {
clearCommandBuffer();
SendCommand(&c);
//flush queue
while (ukbhit()) {
int gc = getchar(); (void)gc;
}
// wait cycle
while (true) {
printf(".");
fflush(stdout);
if (ukbhit()) {
int gc = getchar(); (void)gc;
return -5;
break;
}
UsbCommand resp;
if (WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
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 = (uint32_t)bytes_to_num(resp.d.asBytes + 24, 4);
break;
}
}
printf("\n");
if (par_list == 0 && c.arg[0] == true) {
PrintAndLog("Parity is all zero. Most likely this card sends NACK on every 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;
}
// only parity zero attack
if (par_list == 0 ) {
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 candidate keys. Trying to verify with authentication...\n", keycount);
} else {
PrintAndLog("Found a candidate key. Trying to verify it with authentication...\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(blockno, key_type - 0x60, false, size, keyBlock, key)) {
break;
}
}
if (*key != -1) {
free(last_keylist);
free(keylist);
break;
} else {
PrintAndLog("Test authentication failed. Restarting darkside attack");
free(last_keylist);
last_keylist = keylist;
c.arg[0] = true;
}
}
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 | (keyType << 8)), clear_trace, keycnt}};
memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
clearCommandBuffer();
SendCommand(&c);
UsbCommand resp;
if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)) return 1;
if ((resp.arg[0] & 0xff) != 0x01) return 2;
*key = bytes_to_num(resp.d.asBytes, 6);
return 0;
}
// Sends chunks of keys to device.
// 0 == ok all keys found
// 1 ==
// 2 == Time-out, aborting
int mfCheckKeys_fast( uint8_t sectorsCnt, uint8_t firstChunk, uint8_t lastChunk, uint8_t strategy,
uint32_t size, uint8_t *keyBlock, sector_t *e_sector) {
uint64_t t2 = msclock();
uint32_t timeout = 0;
// send keychunk
UsbCommand c = {CMD_MIFARE_CHKKEYS_FAST, { (sectorsCnt | (firstChunk << 8) | (lastChunk << 12) ), strategy, size}};
memcpy(c.d.asBytes, keyBlock, 6 * size);
clearCommandBuffer();
SendCommand(&c);
UsbCommand resp;
while ( !WaitForResponseTimeout(CMD_ACK, &resp, 2000) ) {
timeout++;
printf(".");
fflush(stdout);
// max timeout for one chunk of 85keys, 60*3sec = 180seconds
// s70 with 40*2 keys to check, 80*85 = 6800 auth.
// takes about 97s, still some margin before abort
if (timeout > 180) {
PrintAndLog("\nNo response from Proxmark. Aborting...");
return 2;
}
}
t2 = msclock() - t2;
// time to convert the returned data.
uint8_t curr_keys = resp.arg[0];
PrintAndLog("\n[-] Chunk: %.1fs | found %u/%u keys (%u)", (float)(t2/1000.0), curr_keys, (sectorsCnt<<1), size);
// all keys?
if ( curr_keys == sectorsCnt*2 || lastChunk ) {
// success array. each byte is status of key
uint8_t arr[80];
uint64_t foo = bytes_to_num(resp.d.asBytes+480, 8);
for (uint8_t i = 0; i < 64; ++i) {
arr[i] = (foo >> i) & 0x1;
}
foo = bytes_to_num(resp.d.asBytes+488, 2);
for (uint8_t i = 0; i < 16; ++i) {
arr[i+64] = (foo >> i) & 0x1;
}
// initialize storage for found keys
icesector_t *tmp = NULL;
tmp = calloc(sectorsCnt, sizeof(icesector_t));
if (tmp == NULL)
return 1;
memcpy(tmp, resp.d.asBytes, sectorsCnt * sizeof(icesector_t) );
for ( int i = 0; i < sectorsCnt; i++) {
// key A
if ( !e_sector[i].foundKey[0] ) {
e_sector[i].Key[0] = bytes_to_num( tmp[i].keyA, 6);
e_sector[i].foundKey[0] = arr[ (i*2) ];
}
// key B
if ( !e_sector[i].foundKey[1] ) {
e_sector[i].Key[1] = bytes_to_num( tmp[i].keyB, 6);
e_sector[i].foundKey[1] = arr[ (i*2) + 1 ];
}
}
free(tmp);
if ( curr_keys == sectorsCnt*2 )
return 0;
if ( lastChunk )
return 1;
}
return 1;
}
// PM3 imp of J-Run mf_key_brute (part 2)
// ref: https://github.com/J-Run/mf_key_brute
int mfKeyBrute(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint64_t *resultkey){
#define KEYS_IN_BLOCK 85
#define KEYBLOCK_SIZE 510
#define CANDIDATE_SIZE 0xFFFF * 6
uint8_t found = false;
uint64_t key64 = 0;
uint8_t candidates[CANDIDATE_SIZE] = {0x00};
uint8_t keyBlock[KEYBLOCK_SIZE] = {0x00};
memset(candidates, 0, sizeof(candidates));
memset(keyBlock, 0, sizeof(keyBlock));
// Generate all possible keys for the first two unknown bytes.
for (uint16_t i = 0; i < 0xFFFF; ++i) {
uint32_t j = i * 6;
candidates[0 + j] = i >> 8;
candidates[1 + j] = i;
candidates[2 + j] = key[2];
candidates[3 + j] = key[3];
candidates[4 + j] = key[4];
candidates[5 + j] = key[5];
}
uint32_t counter, i;
for ( i = 0, counter = 1; i < CANDIDATE_SIZE; i += KEYBLOCK_SIZE, ++counter){
key64 = 0;
// copy candidatekeys to test key block
memcpy(keyBlock, candidates + i, KEYBLOCK_SIZE);
// check a block of generated candidate keys.
if (!mfCheckKeys(blockNo, keyType, true, KEYS_IN_BLOCK, keyBlock, &key64)) {
*resultkey = key64;
found = true;
break;
}
// progress
if ( counter % 20 == 0 )
PrintAndLog("tried : %s.. \t %u keys", sprint_hex(candidates + i, 6), counter * KEYS_IN_BLOCK );
}
return found;
}
// 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;
if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;
return -1;
}
// 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 * resultKey, bool calibrate) {
uint16_t i;
uint32_t uid;
UsbCommand resp;
StateList_t statelists[2];
struct Crypto1State *p1, *p2, *p3, *p4;
UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};
memcpy(c.d.asBytes, key, 6);
clearCommandBuffer();
SendCommand(&c);
if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) return -1;
// error during nested
if (resp.arg[0]) return resp.arg[0];
memcpy(&uid, resp.d.asBytes, 4);
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].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++;
}
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
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);
// Create the intersection
statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead);
//statelists[0].tail.keytail = --p7;
uint32_t numOfCandidates = statelists[0].len;
if ( numOfCandidates == 0 ) goto out;
memset(resultKey, 0, 6);
uint64_t key64 = 0;
// The list may still contain several key candidates. Test each of them with mfCheckKeys
// uint32_t max_keys = keycnt > (USB_CMD_DATA_SIZE/6) ? (USB_CMD_DATA_SIZE/6) : keycnt;
uint8_t keyBlock[USB_CMD_DATA_SIZE] = {0x00};
// ugly assumption that we have less than 85 candidate keys.
for (i = 0; i < numOfCandidates; ++i){
crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);
num_to_bytes(key64, 6, keyBlock + i * 6);
}
if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, numOfCandidates, keyBlock, &key64)) {
free(statelists[0].head.slhead);
free(statelists[1].head.slhead);
num_to_bytes(key64, 6, resultKey);
PrintAndLog("UID: %08x target block:%3u key type: %c -- Found key [%012" PRIx64 "]",
uid,
(uint16_t)resp.arg[2] & 0xff,
(resp.arg[2] >> 8) ? 'B' : 'A',
key64
);
return -5;
}
out:
PrintAndLog("UID: %08x target block:%3u key type: %c",
uid,
(uint16_t)resp.arg[2] & 0xff,
(resp.arg[2] >> 8) ? 'B' : 'A'
);
free(statelists[0].head.slhead);
free(statelists[1].head.slhead);
return -4;
}
// EMULATOR
int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
clearCommandBuffer();
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) {
return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);
}
int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {
UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};
memcpy(c.d.asBytes, data, blocksCount * blockBtWidth);
clearCommandBuffer();
SendCommand(&c);
return 0;
}
// "MAGIC" CARD
int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {
uint8_t params = MAGIC_SINGLE;
uint8_t block0[16];
memset(block0, 0x00, sizeof(block0));
int old = mfCGetBlock(0, block0, params);
if (old == 0)
PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));
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));
if ( wipecard ) params |= MAGIC_WIPE;
if ( oldUID == NULL) params |= MAGIC_UID;
return mfCSetBlock(0, block0, oldUID, params);
}
int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {
uint8_t isOK = 0;
UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};
memcpy(c.d.asBytes, data, 16);
clearCommandBuffer();
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 mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
uint8_t isOK = 0;
UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}};
clearCommandBuffer();
SendCommand(&c);
UsbCommand resp;
if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {
isOK = resp.arg[0] & 0xff;
if (!isOK)
return 2;
memcpy(data, resp.d.asBytes, 16);
} else {
PrintAndLog("Command execute timeout");
return 1;
}
return 0;
}
// SNIFFER
// [iceman] so many global variables....
// 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 = NULL;
uint64_t key = 0;
uint32_t ks2 = 0;
uint32_t ks3 = 0;
uint32_t cuid = 0; // uid part used for crypto1.
uint32_t nt = 0; // tag challenge
uint32_t nr_enc = 0; // encrypted reader challenge
uint32_t ar_enc = 0; // encrypted reader response
uint32_t at_enc = 0; // 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 loadTraceCard(uint8_t *tuid, uint8_t uidlen) {
FILE * f;
char buf[64] = {0x00};
uint8_t buf8[64] = {0x00};
int i, blockNum;
uint32_t tmp;
if (!isTraceCardEmpty())
saveTraceCard();
memset(traceCard, 0x00, 4096);
memcpy(traceCard, tuid, uidlen);
FillFileNameByUID(traceFileName, tuid, ".eml", uidlen);
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("[-] No trace file found or reading error.");
if (f) {
fclose(f);
}
return 2;
}
if (strlen(buf) < 32){
if (feof(f)) break;
PrintAndLog("[-] File content error. Block data must include 32 HEX symbols");
if (f) {
fclose(f);
}
return 2;
}
for (i = 0; i < 32; i += 2) {
sscanf(&buf[i], "%02X", &tmp);
buf8[i / 2] = tmp & 0xFF;
}
memcpy(traceCard + blockNum * 16, buf8, 16);
blockNum++;
}
if (f) {
fclose(f);
}
return 0;
}
int saveTraceCard(void) {
if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
FILE * f;
f = fopen(traceFileName, "w+");
if ( !f ) return 1;
// given 4096 tracecard size, these loop will only match a 1024, 1kb card memory
// 4086/16 == 256blocks.
for (uint16_t i = 0; i < 256; i++) { // blocks
for (uint8_t j = 0; j < 16; j++) // bytes
fprintf(f, "%02X", *(traceCard + i * 16 + j));
// no extra line in the end
if ( i < 255 )
fprintf(f,"\n");
}
fflush(f);
fclose(f);
return 0;
}
//
int mfTraceInit(uint8_t *tuid, uint8_t uidlen, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
if (traceCrypto1)
crypto1_destroy(traceCrypto1);
traceCrypto1 = NULL;
if (wantSaveToEmlFile)
loadTraceCard(tuid, uidlen);
traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
traceCard[5] = sak;
memcpy(&traceCard[6], atqa, 2);
traceCurBlock = 0;
cuid = bytes_to_num(tuid + (uidlen-4), 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;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 0)) << 0;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 1)) << 1;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 2)) << 2;
bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 3)) << 3;
data[0] = bt;
}
}
int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
if (traceState == TRACE_ERROR)
return 1;
if (len > 255) {
traceState = TRACE_ERROR;
return 1;
}
uint8_t data[255];
memset(data, 0x00, sizeof(data));
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] == MIFARE_AUTH_KEYA) || (data[0] == MIFARE_AUTH_KEYB))) {
traceState = TRACE_AUTH1;
traceCurBlock = data[1];
traceCurKey = data[0] == 60 ? 1:0;
return 0;
}
// READ
if ((len == 4) && ((data[0] == ISO14443A_CMD_READBLOCK))) {
traceState = TRACE_READ_DATA;
traceCurBlock = data[1];
return 0;
}
// WRITE
if ((len == 4) && ((data[0] == ISO14443A_CMD_WRITEBLOCK))) {
traceState = TRACE_WRITE_OK;
traceCurBlock = data[1];
return 0;
}
// HALT
if ((len == 4) && ((data[0] == ISO14443A_CMD_HALT) && (data[1] == 0x00))) {
traceState = TRACE_ERROR; // do not decrypt the next commands
return 0;
}
return 0;
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);
// mfkey64 recover key.
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, cuid ^ nt, 0);
crypto1_get_lfsr(revstate, &key);
PrintAndLog("Found Key: [%012" PRIx64 "]", key);
//if ( tryMfk64(cuid, nt, nr_enc, ar_enc, at_enc, &key) )
AddLogUint64(logHexFileName, "Found Key: ", key);
int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
if (isBlockEmpty((traceCurBlock & 0xFC) + 3))
memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
// keytype A/B
if (traceCurKey)
num_to_bytes(key, 6, traceCard + blockShift + 10);
else
num_to_bytes(key, 6, traceCard + blockShift);
if (wantSaveToEmlFile)
saveTraceCard();
if (traceCrypto1)
crypto1_destroy(traceCrypto1);
// set cryptosystem state
traceCrypto1 = lfsr_recovery64(ks2, ks3);
} else {
printf("[!] nested key recovery not implemented!\n");
at_enc = bytes_to_num(data, 4);
crypto1_destroy(traceCrypto1);
traceState = TRACE_ERROR;
}
break;
default:
traceState = TRACE_ERROR;
return 1;
}
return 0;
}
int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){
PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data, len) );
struct Crypto1State *s;
ks2 = ar_enc ^ prng_successor(nt, 64);
ks3 = at_enc ^ prng_successor(nt, 96);
s = lfsr_recovery64(ks2, ks3);
mf_crypto1_decrypt(s, data, len, false);
PrintAndLog("Decrypted data: [%s]", sprint_hex(data, len) );
crypto1_destroy(s);
return 0;
}
/* 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)
*/
bool detect_classic_prng(void){
UsbCommand resp, respA;
uint8_t cmd[] = {MIFARE_AUTH_KEYA, 0x00};
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 false;
}
// if select tag failed.
if ( resp.arg[0] == 0 ) {
printf("Error: selecting tag failed, can't detect prng\n");
return false;
}
if (!WaitForResponseTimeout(CMD_ACK, &respA, 2500)) {
PrintAndLog("PRNG data: Reply timeout.");
return false;
}
// check respA
if (respA.arg[0] != 4) {
PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]);
return false;
}
uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);
return validate_prng_nonce(nonce);
}
/* Detect Mifare Classic NACK bug
returns:
0 = error during test / aborted
1 = has nack bug
2 = has not nack bug
3 = always leak nacks (clones)
*/
int detect_classic_nackbug(bool verbose){
UsbCommand c = {CMD_MIFARE_NACK_DETECT, {0, 0, 0}};
clearCommandBuffer();
SendCommand(&c);
UsbCommand resp;
if ( verbose )
printf("Press pm3-button on the proxmark3 device to abort both proxmark3 and client.\n");
// for nice animation
bool term = !isatty(STDIN_FILENO);
char star[] = {'-', '\\', '|', '/'};
uint8_t staridx = 0;
while (true) {
if (term) {
printf(".");
} else {
printf("\e[s%c\e[u", star[ (staridx++ % 4) ]);
}
fflush(stdout);
if (ukbhit()) {
int gc = getchar(); (void)gc;
return -1;
break;
}
if (WaitForResponseTimeout(CMD_ACK, &resp, 500)) {
int32_t ok = resp.arg[0];
uint32_t nacks = resp.arg[1];
uint32_t auths = resp.arg[2];
PrintAndLog("");
if ( verbose ) {
PrintAndLog("Num of auth requests : %u", auths);
PrintAndLog("Num of received NACK : %u", nacks);
}
switch( ok ) {
case 99 : PrintAndLog("Button pressed. Aborted."); return 0;
case 96 :
case 98 : {
if (verbose)
PrintAndLog("Card random number generator is not predictable.");
PrintAndLog("Detection failed");
return 2;
}
case 97 : {
if (verbose) {
PrintAndLog("Card random number generator seems to be based on the well-known generating polynomial");
PrintAndLog("with 16 effective bits only, but shows unexpected behavior, try again.");
return 0;
}
}
case 2 : PrintAndLog("Always leak NACK detected"); return 3;
case 1 : PrintAndLog("NACK bug detected"); return 1;
case 0 : PrintAndLog("No NACK bug detected"); return 2;
default : PrintAndLog(" errorcode from device [%i]", ok); return 0;
}
break;
}
}
return 0;
}
/* try to see if card responses to "chinese magic backdoor" commands. */
void detect_classic_magic(void) {
uint8_t isGeneration = 0;
UsbCommand resp;
UsbCommand c = {CMD_MIFARE_CIDENT, {0, 0, 0}};
clearCommandBuffer();
SendCommand(&c);
if (WaitForResponseTimeout(CMD_ACK, &resp, 1500))
isGeneration = resp.arg[0] & 0xff;
switch( isGeneration ){
case 1: PrintAndLog("Answers to magic commands (GEN 1a): YES"); break;
case 2: PrintAndLog("Answers to magic commands (GEN 1b): YES"); break;
//case 4: PrintAndLog("Answers to magic commands (GEN 2): YES"); break;
default: PrintAndLog("Answers to magic commands: NO"); break;
}
}
Reference in a new issue View git blame Copy permalink