X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/26ea310f0e5d5158ede05e0236e315b2b1cb5bdb..refs/pull/507/head:/client/mifarehost.c?ds=sidebyside

diff --git a/client/mifarehost.c b/client/mifarehost.c
index 3b524758..67277b59 100644
--- a/client/mifarehost.c
+++ b/client/mifarehost.c
@@ -228,17 +228,46 @@ int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t key
 
 	*key = -1;
 
-	UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};
+	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 (!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) {
 	if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;
@@ -418,7 +447,7 @@ int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
 	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;
 		memcpy(data, resp.d.asBytes, 16);
@@ -437,8 +466,8 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uin
 	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;
 		if (uid != NULL)
 			memcpy(uid, resp.d.asBytes, 4);
@@ -448,25 +477,40 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uin
 		PrintAndLog("Command execute timeout");
 		return 1;
 	}
+
 	return 0;
 }
 
-int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool wantWipe) {
+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 old, gen = 0;
+	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 */
-		old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B);
-	} else {
-		/* generation 1a magic card by default */
-		old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);
+		cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B;
 	}
+	
+	res = mfCGetBlock(0, oldblock0, cmdParams);
 
-	if (old == 0) {
+	if (res == 0) {
 		memcpy(block0, oldblock0, 16);
 		PrintAndLog("old block 0:  %s", sprint_hex(block0,16));
 	} else {
@@ -477,25 +521,42 @@ int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool w
 	// UID
 	memcpy(block0, uid, 4);
 	// Mifare UID BCC
-	block0[4] = block0[0]^block0[1]^block0[2]^block0[3];
+	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];
+	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));
+	PrintAndLog("new block 0:  %s", sprint_hex(block0, 16));
 
-	if (gen == 2) {
-		/* generation 1b magic card */
-		return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B);
-	} else {
-		/* generation 1a magic card by default */
-		return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
+	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
@@ -820,6 +881,8 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
 	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
@@ -840,49 +903,72 @@ int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data,
 	return 0;
 }
 
-int mfCIdentify()
-{
-	UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_CONNECT | ISO14A_NO_DISCONNECT, 0, 0}};
-	SendCommand(&c);
-
-	UsbCommand resp;
-	WaitForResponse(CMD_ACK,&resp);
-
-	iso14a_card_select_t card;
-	memcpy(&card, (iso14a_card_select_t *)resp.d.asBytes, sizeof(iso14a_card_select_t));
-
-	uint64_t select_status = resp.arg[0];		// 0: couldn't read, 1: OK, with ATS, 2: OK, no ATS, 3: proprietary Anticollision
+/** 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;
 
-	if(select_status != 0) {
-		uint8_t rats[] = { 0xE0, 0x80 }; // FSDI=8 (FSD=256), CID=0
-		c.arg[0] = ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_DISCONNECT;
-		c.arg[1] = 2;
-		c.arg[2] = 0;
-		memcpy(c.d.asBytes, rats, 2);
-		SendCommand(&c);
-		WaitForResponse(CMD_ACK,&resp);
+	// 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);
+}
 
-	c.cmd = CMD_MIFARE_CIDENT;
-	c.arg[0] = 0;
-	c.arg[1] = 0;
-	c.arg[2] = 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)
+*/
+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);
-	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;
+	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;
 	}
 
-	// disconnect
-	c.cmd = CMD_READER_ISO_14443a;
-	c.arg[0] = 0;
-	c.arg[1] = 0;
-	c.arg[2] = 0;
-	SendCommand(&c);
+	// check respA
+	if (respA.arg[0] != 4) {
+		PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]);
+		return -1;
+	}
 
-	return (int) isGeneration;
+	uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);
+	return validate_prng_nonce(nonce);
 }