X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/bb04ef216debb8e5996dfe7acddf6af4413cb69a..b35e04a7c6a8b6c99fcdc8f45e387437cbae4f08:/armsrc/mifaresim.c diff --git a/armsrc/mifaresim.c b/armsrc/mifaresim.c index 91f45efd..1fdf99d6 100644 --- a/armsrc/mifaresim.c +++ b/armsrc/mifaresim.c @@ -41,6 +41,132 @@ #define cardSTATE_TO_IDLE() { cardSTATE = MFEMUL_IDLE; LED_B_OFF(); LED_C_OFF(); } +#define AC_DATA_READ 0 +#define AC_DATA_WRITE 1 +#define AC_DATA_INC 2 +#define AC_DATA_DEC_TRANS_REST 3 +#define AC_KEYA_READ 0 +#define AC_KEYA_WRITE 1 +#define AC_KEYB_READ 2 +#define AC_KEYB_WRITE 3 +#define AC_AC_READ 4 +#define AC_AC_WRITE 5 + +#define AUTHKEYA 0 +#define AUTHKEYB 1 +#define AUTHKEYNONE 0xff + + +static bool IsTrailerAccessAllowed(uint8_t blockNo, uint8_t keytype, uint8_t action) { + uint8_t sector_trailer[16]; + emlGetMem(sector_trailer, blockNo, 1); + uint8_t AC = ((sector_trailer[7] >> 5) & 0x04) + | ((sector_trailer[8] >> 2) & 0x02) + | ((sector_trailer[8] >> 7) & 0x01); + switch (action) { + case AC_KEYA_READ: { + return false; + break; + } + case AC_KEYA_WRITE: { + return ((keytype == AUTHKEYA && (AC == 0x00 || AC == 0x01)) + || (keytype == AUTHKEYB && (AC == 0x04 || AC == 0x03))); + break; + } + case AC_KEYB_READ: { + return (keytype == AUTHKEYA && (AC == 0x00 || AC == 0x02 || AC == 0x01)); + break; + } + case AC_KEYB_WRITE: { + return ((keytype == AUTHKEYA && (AC == 0x00 || AC == 0x04)) + || (keytype == AUTHKEYB && (AC == 0x04 || AC == 0x03))); + break; + } + case AC_AC_READ: { + return ((keytype == AUTHKEYA) + || (keytype == AUTHKEYB && !(AC == 0x00 || AC == 0x02 || AC == 0x01))); + break; + } + case AC_AC_WRITE: { + return ((keytype == AUTHKEYA && (AC == 0x01)) + || (keytype == AUTHKEYB && (AC == 0x03 || AC == 0x05))); + break; + } + default: return false; + } +} + + +static bool IsDataAccessAllowed(uint8_t blockNo, uint8_t keytype, uint8_t action) +{ + uint8_t sector_trailer[16]; + emlGetMem(sector_trailer, SectorTrailer(blockNo), 1); + + uint8_t sector_block; + if (blockNo < 32*4) { + sector_block = blockNo & 0x03; + } else { + sector_block = (blockNo & 0x0f) / 5; + } + + uint8_t AC; + switch (sector_block) { + case 0x00: { + AC = ((sector_trailer[7] >> 2) & 0x04) + | ((sector_trailer[8] << 1) & 0x02) + | ((sector_trailer[8] >> 4) & 0x01); + break; + } + case 0x01: { + AC = ((sector_trailer[7] >> 3) & 0x04) + | ((sector_trailer[8] >> 0) & 0x02) + | ((sector_trailer[8] >> 5) & 0x01); + break; + } + case 0x02: { + AC = ((sector_trailer[7] >> 4) & 0x04) + | ((sector_trailer[8] >> 1) & 0x02) + | ((sector_trailer[8] >> 6) & 0x01); + break; + } + default: + return false; + } + + switch (action) { + case AC_DATA_READ: { + return ((keytype == AUTHKEYA && !(AC == 0x03 || AC == 0x05 || AC == 0x07)) + || (keytype == AUTHKEYB && !(AC == 0x07))); + break; + } + case AC_DATA_WRITE: { + return ((keytype == AUTHKEYA && (AC == 0x00)) + || (keytype == AUTHKEYB && (AC == 0x00 || AC == 0x04 || AC == 0x06 || AC == 0x03))); + break; + } + case AC_DATA_INC: { + return ((keytype == AUTHKEYA && (AC == 0x00)) + || (keytype == AUTHKEYB && (AC == 0x00 || AC == 0x06))); + break; + } + case AC_DATA_DEC_TRANS_REST: { + return ((keytype == AUTHKEYA && (AC == 0x00 || AC == 0x06 || AC == 0x01)) + || (keytype == AUTHKEYB && (AC == 0x00 || AC == 0x06 || AC == 0x01))); + break; + } + } + + return false; +} + + +static bool IsAccessAllowed(uint8_t blockNo, uint8_t keytype, uint8_t action) { + if (IsSectorTrailer(blockNo)) { + return IsTrailerAccessAllowed(blockNo, keytype, action); + } else { + return IsDataAccessAllowed(blockNo, keytype, action); + } +} static void MifareSimInit(uint8_t flags, uint8_t *datain, tag_response_info_t **responses, uint32_t *cuid, uint8_t *uid_len) { @@ -155,7 +281,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint32_t cuid = 0; uint8_t cardWRBL = 0; uint8_t cardAUTHSC = 0; - uint8_t cardAUTHKEY = 0xff; // no authentication + uint8_t cardAUTHKEY = AUTHKEYNONE; // no authentication uint32_t cardRr = 0; //uint32_t rn_enc = 0; uint32_t ans = 0; @@ -244,11 +370,11 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // WUPA in HALTED state or REQA or WUPA in any other state if (receivedCmd_len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) { - EmSendPrecompiledCmd(&responses[ATQA], (receivedCmd[0] == ISO14443A_CMD_WUPA)); + EmSendPrecompiledCmd(&responses[ATQA]); // init crypto block crypto1_destroy(pcs); - cardAUTHKEY = 0xff; + cardAUTHKEY = AUTHKEYNONE; if (flags & FLAG_RANDOM_NONCE) { nonce = prand(); } @@ -268,7 +394,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // select all - 0x93 0x20 if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x20)) { if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL CL1 received"); - EmSendPrecompiledCmd(&responses[UIDBCC1], false); + EmSendPrecompiledCmd(&responses[UIDBCC1]); break; } // select card - 0x93 0x70 ... @@ -276,12 +402,12 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], responses[UIDBCC1].response, 4) == 0)) { if (MF_DBGLEVEL >= 4) Dbprintf("SELECT CL1 %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); if (uid_len == 4) { - EmSendPrecompiledCmd(&responses[SAKfinal], false); + EmSendPrecompiledCmd(&responses[SAKfinal]); LED_B_ON(); cardSTATE = MFEMUL_WORK; break; } else if (uid_len == 7) { - EmSendPrecompiledCmd(&responses[SAK1], false); + EmSendPrecompiledCmd(&responses[SAK1]); cardSTATE = MFEMUL_SELECT2; break; } @@ -293,7 +419,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // select all cl2 - 0x95 0x20 if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x20)) { if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL CL2 received"); - EmSendPrecompiledCmd(&responses[UIDBCC2], false); + EmSendPrecompiledCmd(&responses[UIDBCC2]); break; } // select cl2 card - 0x95 0x70 xxxxxxxxxxxx @@ -301,7 +427,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], responses[UIDBCC2].response, 4) == 0)) { if (uid_len == 7) { if (MF_DBGLEVEL >= 4) Dbprintf("SELECT CL2 %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); - EmSendPrecompiledCmd(&responses[SAKfinal], false); + EmSendPrecompiledCmd(&responses[SAKfinal]); LED_B_ON(); cardSTATE = MFEMUL_WORK; break; @@ -314,7 +440,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (receivedCmd_len != 4) { // all commands must have exactly 4 bytes break; } - bool encrypted_data = (cardAUTHKEY != 0xFF) ; + bool encrypted_data = (cardAUTHKEY != AUTHKEYNONE) ; if (encrypted_data) { // decrypt seqence mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec); @@ -371,10 +497,24 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } } if (receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK) { + uint8_t blockNo = receivedCmd_dec[1]; if (MF_DBGLEVEL >= 4) { - Dbprintf("Reader reading block %d (0x%02x)",receivedCmd_dec[1],receivedCmd_dec[1]); + Dbprintf("Reader reading block %d (0x%02x)", blockNo, blockNo); + } + emlGetMem(response, blockNo, 1); + if (IsSectorTrailer(blockNo)) { + memset(response, 0x00, 6); // keyA can never be read + if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_KEYB_READ)) { + memset(response+10, 0x00, 6); // keyB cannot be read + } + if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_AC_READ)) { + memset(response+6, 0x00, 4); // AC bits cannot be read + } + } else { + if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_DATA_READ)) { + memset(response, 0x00, 16); // datablock cannot be read + } } - emlGetMem(response, receivedCmd_dec[1], 1); AppendCrc14443a(response, 16); mf_crypto1_encrypt(pcs, response, 18, response_par); EmSendCmdPar(response, 18, response_par); @@ -386,21 +526,23 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } if (receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK) { - if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd_dec[1],receivedCmd_dec[1]); + uint8_t blockNo = receivedCmd_dec[1]; + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)", blockNo, blockNo); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); - cardWRBL = receivedCmd_dec[1]; + cardWRBL = blockNo; cardSTATE = MFEMUL_WRITEBL2; break; } if (receivedCmd_dec[0] == MIFARE_CMD_INC || receivedCmd_dec[0] == MIFARE_CMD_DEC || receivedCmd_dec[0] == MIFARE_CMD_RESTORE) { - if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]); - if (emlCheckValBl(receivedCmd_dec[1])) { + uint8_t blockNo = receivedCmd_dec[1]; + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd_dec[0], blockNo, blockNo); + if (emlCheckValBl(blockNo)) { if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking"); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); break; } EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); - cardWRBL = receivedCmd_dec[1]; + cardWRBL = blockNo; if (receivedCmd_dec[0] == MIFARE_CMD_INC) cardSTATE = MFEMUL_INTREG_INC; if (receivedCmd_dec[0] == MIFARE_CMD_DEC) @@ -410,7 +552,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } if (receivedCmd_dec[0] == MIFARE_CMD_TRANSFER) { - if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]); + uint8_t blockNo = receivedCmd_dec[1]; + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd_dec[0], blockNo, blockNo); if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd_dec[1])) EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); else @@ -508,20 +651,20 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // test if auth OK if (cardRr != prng_successor(nonce, 64)){ if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x", - cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', + cardAUTHSC, cardAUTHKEY == AUTHKEYA ? 'A' : 'B', cardRr, prng_successor(nonce, 64)); // Shouldn't we respond anything here? // Right now, we don't nack or anything, which causes the // reader to do a WUPA after a while. /Martin // -- which is the correct response. /piwi - cardAUTHKEY = 0xff; // not authenticated + cardAUTHKEY = AUTHKEYNONE; // not authenticated cardSTATE_TO_IDLE(); break; } ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0); num_to_bytes(ans, 4, rAUTH_AT); EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); - if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED for sector %d with key %c.", cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B'); + if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED for sector %d with key %c.", cardAUTHSC, cardAUTHKEY == AUTHKEYA ? 'A' : 'B'); LED_C_ON(); cardSTATE = MFEMUL_WORK; break; @@ -530,8 +673,24 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (receivedCmd_len == 18) { mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec); if (HasValidCRC(receivedCmd_dec, receivedCmd_len)) { + if (IsSectorTrailer(cardWRBL)) { + emlGetMem(response, cardWRBL, 1); + if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_KEYA_WRITE)) { + memcpy(receivedCmd_dec, response, 6); // don't change KeyA + } + if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_KEYB_WRITE)) { + memcpy(receivedCmd_dec+10, response+10, 6); // don't change KeyA + } + if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_AC_WRITE)) { + memcpy(receivedCmd_dec+6, response+6, 4); // don't change AC bits + } + } else { + if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_DATA_WRITE)) { + memcpy(receivedCmd_dec, response, 16); // don't change anything + } + } emlSetMem(receivedCmd_dec, cardWRBL, 1); - EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); + EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); // always ACK? cardSTATE = MFEMUL_WORK; break; }