bf15d3ce74
* NFC: Improved MFC emulation on some readers * NFC: Improved emulation on some readers (part 2): Some Android devices don't like this * NFC: Improved emulation on some readers (part 3): I knew that during the emulation timings are critical, but one log breaks all... * NFC: Improved emulation on some readers (part 4): Add fixes to Detect reader and refactor code * NFC: Improved emulation on some readers (part 5) * NFC: Improved emulation on some readers (part 6): GUI doesn't update without delay * NFC: Improved emulation on some readers (part 7): Reworked emulation flow, some bug fixes and improvements Co-authored-by: あく <alleteam@gmail.com> Co-authored-by: gornekich <n.gorbadey@gmail.com>
1621 lines
56 KiB
C
1621 lines
56 KiB
C
#include "mifare_classic.h"
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#include "nfca.h"
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#include "nfc_util.h"
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#include <furi_hal_rtc.h>
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// Algorithm from https://github.com/RfidResearchGroup/proxmark3.git
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#define TAG "MfClassic"
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#define MF_CLASSIC_ACK_CMD 0xAU
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#define MF_CLASSIC_NACK_BUF_VALID_CMD 0x0U
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#define MF_CLASSIC_NACK_BUF_INVALID_CMD 0x4U
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#define MF_CLASSIC_AUTH_KEY_A_CMD 0x60U
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#define MF_CLASSIC_AUTH_KEY_B_CMD 0x61U
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#define MF_CLASSIC_READ_BLOCK_CMD 0x30U
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#define MF_CLASSIC_WRITE_BLOCK_CMD 0xA0U
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#define MF_CLASSIC_TRANSFER_CMD 0xB0U
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#define MF_CLASSIC_DECREMENT_CMD 0xC0U
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#define MF_CLASSIC_INCREMENT_CMD 0xC1U
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#define MF_CLASSIC_RESTORE_CMD 0xC2U
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const char* mf_classic_get_type_str(MfClassicType type) {
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if(type == MfClassicTypeMini) {
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return "MIFARE Mini 0.3K";
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} else if(type == MfClassicType1k) {
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return "MIFARE Classic 1K";
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} else if(type == MfClassicType4k) {
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return "MIFARE Classic 4K";
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} else {
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return "Unknown";
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}
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}
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static uint8_t mf_classic_get_first_block_num_of_sector(uint8_t sector) {
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furi_assert(sector < 40);
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if(sector < 32) {
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return sector * 4;
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} else {
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return 32 * 4 + (sector - 32) * 16;
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}
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}
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uint8_t mf_classic_get_sector_trailer_block_num_by_sector(uint8_t sector) {
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furi_assert(sector < 40);
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if(sector < 32) {
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return sector * 4 + 3;
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} else {
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return 32 * 4 + (sector - 32) * 16 + 15;
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}
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}
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uint8_t mf_classic_get_sector_by_block(uint8_t block) {
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if(block < 128) {
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return (block | 0x03) / 4;
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} else {
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return 32 + ((block | 0xf) - 32 * 4) / 16;
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}
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}
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static uint8_t mf_classic_get_blocks_num_in_sector(uint8_t sector) {
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furi_assert(sector < 40);
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return sector < 32 ? 4 : 16;
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}
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uint8_t mf_classic_get_sector_trailer_num_by_block(uint8_t block) {
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if(block < 128) {
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return block | 0x03;
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} else {
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return block | 0x0f;
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}
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}
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bool mf_classic_is_sector_trailer(uint8_t block) {
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return block == mf_classic_get_sector_trailer_num_by_block(block);
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}
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MfClassicSectorTrailer*
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mf_classic_get_sector_trailer_by_sector(MfClassicData* data, uint8_t sector) {
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furi_assert(data);
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uint8_t sec_tr_block_num = mf_classic_get_sector_trailer_block_num_by_sector(sector);
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return (MfClassicSectorTrailer*)data->block[sec_tr_block_num].value;
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}
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uint8_t mf_classic_get_total_sectors_num(MfClassicType type) {
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if(type == MfClassicTypeMini) {
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return MF_MINI_TOTAL_SECTORS_NUM;
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} else if(type == MfClassicType1k) {
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return MF_CLASSIC_1K_TOTAL_SECTORS_NUM;
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} else if(type == MfClassicType4k) {
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return MF_CLASSIC_4K_TOTAL_SECTORS_NUM;
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} else {
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return 0;
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}
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}
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uint16_t mf_classic_get_total_block_num(MfClassicType type) {
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if(type == MfClassicTypeMini) {
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return 20;
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} else if(type == MfClassicType1k) {
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return 64;
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} else if(type == MfClassicType4k) {
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return 256;
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} else {
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return 0;
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}
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}
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bool mf_classic_is_block_read(MfClassicData* data, uint8_t block_num) {
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furi_assert(data);
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return (FURI_BIT(data->block_read_mask[block_num / 32], block_num % 32) == 1);
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}
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void mf_classic_set_block_read(MfClassicData* data, uint8_t block_num, MfClassicBlock* block_data) {
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furi_assert(data);
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if(mf_classic_is_sector_trailer(block_num)) {
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memcpy(&data->block[block_num].value[6], &block_data->value[6], 4);
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} else {
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memcpy(data->block[block_num].value, block_data->value, MF_CLASSIC_BLOCK_SIZE);
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}
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FURI_BIT_SET(data->block_read_mask[block_num / 32], block_num % 32);
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}
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bool mf_classic_is_sector_data_read(MfClassicData* data, uint8_t sector_num) {
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furi_assert(data);
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uint8_t first_block = mf_classic_get_first_block_num_of_sector(sector_num);
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uint8_t total_blocks = mf_classic_get_blocks_num_in_sector(sector_num);
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bool data_read = true;
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for(size_t i = first_block; i < first_block + total_blocks; i++) {
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data_read &= mf_classic_is_block_read(data, i);
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}
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return data_read;
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}
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void mf_classic_set_sector_data_not_read(MfClassicData* data) {
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furi_assert(data);
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memset(data->block_read_mask, 0, sizeof(data->block_read_mask));
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}
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bool mf_classic_is_key_found(MfClassicData* data, uint8_t sector_num, MfClassicKey key_type) {
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furi_assert(data);
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bool key_found = false;
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if(key_type == MfClassicKeyA) {
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key_found = (FURI_BIT(data->key_a_mask, sector_num) == 1);
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} else if(key_type == MfClassicKeyB) {
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key_found = (FURI_BIT(data->key_b_mask, sector_num) == 1);
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}
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return key_found;
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}
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void mf_classic_set_key_found(
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MfClassicData* data,
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uint8_t sector_num,
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MfClassicKey key_type,
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uint64_t key) {
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furi_assert(data);
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uint8_t key_arr[6] = {};
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MfClassicSectorTrailer* sec_trailer =
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mf_classic_get_sector_trailer_by_sector(data, sector_num);
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nfc_util_num2bytes(key, 6, key_arr);
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if(key_type == MfClassicKeyA) {
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memcpy(sec_trailer->key_a, key_arr, sizeof(sec_trailer->key_a));
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FURI_BIT_SET(data->key_a_mask, sector_num);
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} else if(key_type == MfClassicKeyB) {
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memcpy(sec_trailer->key_b, key_arr, sizeof(sec_trailer->key_b));
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FURI_BIT_SET(data->key_b_mask, sector_num);
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}
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}
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void mf_classic_set_key_not_found(MfClassicData* data, uint8_t sector_num, MfClassicKey key_type) {
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furi_assert(data);
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if(key_type == MfClassicKeyA) {
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FURI_BIT_CLEAR(data->key_a_mask, sector_num);
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} else if(key_type == MfClassicKeyB) {
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FURI_BIT_CLEAR(data->key_b_mask, sector_num);
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}
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}
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bool mf_classic_is_sector_read(MfClassicData* data, uint8_t sector_num) {
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furi_assert(data);
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bool sector_read = false;
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do {
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if(!mf_classic_is_key_found(data, sector_num, MfClassicKeyA)) break;
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if(!mf_classic_is_key_found(data, sector_num, MfClassicKeyB)) break;
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uint8_t start_block = mf_classic_get_first_block_num_of_sector(sector_num);
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uint8_t total_blocks = mf_classic_get_blocks_num_in_sector(sector_num);
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uint8_t block_read = true;
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for(size_t i = start_block; i < start_block + total_blocks; i++) {
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block_read = mf_classic_is_block_read(data, i);
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if(!block_read) break;
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}
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sector_read = block_read;
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} while(false);
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return sector_read;
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}
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void mf_classic_get_read_sectors_and_keys(
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MfClassicData* data,
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uint8_t* sectors_read,
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uint8_t* keys_found) {
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furi_assert(data);
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furi_assert(sectors_read);
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furi_assert(keys_found);
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*sectors_read = 0;
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*keys_found = 0;
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uint8_t sectors_total = mf_classic_get_total_sectors_num(data->type);
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for(size_t i = 0; i < sectors_total; i++) {
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if(mf_classic_is_key_found(data, i, MfClassicKeyA)) {
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*keys_found += 1;
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}
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if(mf_classic_is_key_found(data, i, MfClassicKeyB)) {
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*keys_found += 1;
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}
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uint8_t first_block = mf_classic_get_first_block_num_of_sector(i);
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uint8_t total_blocks_in_sec = mf_classic_get_blocks_num_in_sector(i);
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bool blocks_read = true;
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for(size_t j = first_block; j < first_block + total_blocks_in_sec; j++) {
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blocks_read = mf_classic_is_block_read(data, j);
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if(!blocks_read) break;
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}
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if(blocks_read) {
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*sectors_read += 1;
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}
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}
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}
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bool mf_classic_is_card_read(MfClassicData* data) {
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furi_assert(data);
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uint8_t sectors_total = mf_classic_get_total_sectors_num(data->type);
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uint8_t sectors_read = 0;
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uint8_t keys_found = 0;
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mf_classic_get_read_sectors_and_keys(data, §ors_read, &keys_found);
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bool card_read = (sectors_read == sectors_total) && (keys_found == sectors_total * 2);
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return card_read;
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}
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bool mf_classic_is_allowed_access_sector_trailer(
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MfClassicData* data,
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uint8_t block_num,
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MfClassicKey key,
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MfClassicAction action) {
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uint8_t* sector_trailer = data->block[block_num].value;
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uint8_t AC = ((sector_trailer[7] >> 5) & 0x04) | ((sector_trailer[8] >> 2) & 0x02) |
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((sector_trailer[8] >> 7) & 0x01);
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switch(action) {
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case MfClassicActionKeyARead: {
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return false;
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}
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case MfClassicActionKeyAWrite:
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case MfClassicActionKeyBWrite: {
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return (
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(key == MfClassicKeyA && (AC == 0x00 || AC == 0x01)) ||
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(key == MfClassicKeyB && (AC == 0x04 || AC == 0x03)));
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}
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case MfClassicActionKeyBRead: {
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return (key == MfClassicKeyA && (AC == 0x00 || AC == 0x02 || AC == 0x01));
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}
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case MfClassicActionACRead: {
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return (
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(key == MfClassicKeyA) ||
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(key == MfClassicKeyB && !(AC == 0x00 || AC == 0x02 || AC == 0x01)));
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}
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case MfClassicActionACWrite: {
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return (
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(key == MfClassicKeyA && (AC == 0x01)) ||
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(key == MfClassicKeyB && (AC == 0x03 || AC == 0x05)));
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}
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default:
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return false;
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}
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return true;
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}
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bool mf_classic_is_allowed_access_data_block(
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MfClassicData* data,
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uint8_t block_num,
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MfClassicKey key,
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MfClassicAction action) {
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uint8_t* sector_trailer =
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data->block[mf_classic_get_sector_trailer_num_by_block(block_num)].value;
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if(block_num == 0 && action == MfClassicActionDataWrite) {
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return false;
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}
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uint8_t sector_block;
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if(block_num <= 128) {
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sector_block = block_num & 0x03;
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} else {
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sector_block = (block_num & 0x0f) / 5;
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}
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uint8_t AC;
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switch(sector_block) {
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case 0x00: {
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AC = ((sector_trailer[7] >> 2) & 0x04) | ((sector_trailer[8] << 1) & 0x02) |
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((sector_trailer[8] >> 4) & 0x01);
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break;
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}
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case 0x01: {
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AC = ((sector_trailer[7] >> 3) & 0x04) | ((sector_trailer[8] >> 0) & 0x02) |
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((sector_trailer[8] >> 5) & 0x01);
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break;
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}
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case 0x02: {
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AC = ((sector_trailer[7] >> 4) & 0x04) | ((sector_trailer[8] >> 1) & 0x02) |
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((sector_trailer[8] >> 6) & 0x01);
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break;
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}
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default:
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return false;
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}
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switch(action) {
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case MfClassicActionDataRead: {
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return (
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(key == MfClassicKeyA && !(AC == 0x03 || AC == 0x05 || AC == 0x07)) ||
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(key == MfClassicKeyB && !(AC == 0x07)));
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}
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case MfClassicActionDataWrite: {
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return (
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(key == MfClassicKeyA && (AC == 0x00)) ||
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(key == MfClassicKeyB && (AC == 0x00 || AC == 0x04 || AC == 0x06 || AC == 0x03)));
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}
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case MfClassicActionDataInc: {
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return (
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(key == MfClassicKeyA && (AC == 0x00)) ||
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(key == MfClassicKeyB && (AC == 0x00 || AC == 0x06)));
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}
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case MfClassicActionDataDec: {
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return (
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(key == MfClassicKeyA && (AC == 0x00 || AC == 0x06 || AC == 0x01)) ||
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(key == MfClassicKeyB && (AC == 0x00 || AC == 0x06 || AC == 0x01)));
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}
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default:
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return false;
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}
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return false;
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}
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static bool mf_classic_is_allowed_access(
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MfClassicEmulator* emulator,
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uint8_t block_num,
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MfClassicKey key,
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MfClassicAction action) {
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if(mf_classic_is_sector_trailer(block_num)) {
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return mf_classic_is_allowed_access_sector_trailer(
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&emulator->data, block_num, key, action);
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} else {
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return mf_classic_is_allowed_access_data_block(&emulator->data, block_num, key, action);
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}
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}
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bool mf_classic_is_value_block(MfClassicData* data, uint8_t block_num) {
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// Check if key A can write, if it can, it's transport configuration, not data block
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return !mf_classic_is_allowed_access_data_block(
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data, block_num, MfClassicKeyA, MfClassicActionDataWrite) &&
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(mf_classic_is_allowed_access_data_block(
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data, block_num, MfClassicKeyB, MfClassicActionDataInc) ||
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mf_classic_is_allowed_access_data_block(
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data, block_num, MfClassicKeyB, MfClassicActionDataDec));
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}
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bool mf_classic_check_card_type(uint8_t ATQA0, uint8_t ATQA1, uint8_t SAK) {
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UNUSED(ATQA1);
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if((ATQA0 == 0x44 || ATQA0 == 0x04) && (SAK == 0x08 || SAK == 0x88 || SAK == 0x09)) {
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return true;
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} else if((ATQA0 == 0x01) && (ATQA1 == 0x0F) && (SAK == 0x01)) {
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//skylanders support
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return true;
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} else if((ATQA0 == 0x42 || ATQA0 == 0x02) && (SAK == 0x18)) {
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return true;
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} else {
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return false;
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}
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}
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MfClassicType mf_classic_get_classic_type(uint8_t ATQA0, uint8_t ATQA1, uint8_t SAK) {
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UNUSED(ATQA1);
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if((ATQA0 == 0x44 || ATQA0 == 0x04)) {
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if((SAK == 0x08 || SAK == 0x88)) {
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return MfClassicType1k;
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} else if(SAK == 0x09) {
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return MfClassicTypeMini;
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}
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} else if((ATQA0 == 0x01) && (ATQA1 == 0x0F) && (SAK == 0x01)) {
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//skylanders support
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return MfClassicType1k;
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} else if((ATQA0 == 0x42 || ATQA0 == 0x02) && (SAK == 0x18)) {
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return MfClassicType4k;
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}
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return MfClassicType1k;
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}
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void mf_classic_reader_add_sector(
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MfClassicReader* reader,
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uint8_t sector,
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uint64_t key_a,
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uint64_t key_b) {
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furi_assert(reader);
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furi_assert(sector < MF_CLASSIC_SECTORS_MAX);
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furi_assert((key_a != MF_CLASSIC_NO_KEY) || (key_b != MF_CLASSIC_NO_KEY));
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if(reader->sectors_to_read < MF_CLASSIC_SECTORS_MAX) {
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reader->sector_reader[reader->sectors_to_read].key_a = key_a;
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reader->sector_reader[reader->sectors_to_read].key_b = key_b;
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reader->sector_reader[reader->sectors_to_read].sector_num = sector;
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reader->sectors_to_read++;
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}
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}
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bool mf_classic_block_to_value(const uint8_t* block, int32_t* value, uint8_t* addr) {
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uint32_t v = *(uint32_t*)&block[0];
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uint32_t v_inv = *(uint32_t*)&block[4];
|
|
uint32_t v1 = *(uint32_t*)&block[8];
|
|
|
|
bool val_checks =
|
|
((v == v1) && (v == ~v_inv) && (block[12] == (~block[13] & 0xFF)) &&
|
|
(block[14] == (~block[15] & 0xFF)) && (block[12] == block[14]));
|
|
if(value) {
|
|
*value = (int32_t)v;
|
|
}
|
|
if(addr) {
|
|
*addr = block[12];
|
|
}
|
|
return val_checks;
|
|
}
|
|
|
|
void mf_classic_value_to_block(int32_t value, uint8_t addr, uint8_t* block) {
|
|
uint32_t v_inv = ~((uint32_t)value);
|
|
|
|
memcpy(block, &value, 4); //-V1086
|
|
memcpy(block + 4, &v_inv, 4); //-V1086
|
|
memcpy(block + 8, &value, 4); //-V1086
|
|
|
|
block[12] = addr;
|
|
block[13] = ~addr & 0xFF;
|
|
block[14] = addr;
|
|
block[15] = ~addr & 0xFF;
|
|
}
|
|
|
|
void mf_classic_auth_init_context(MfClassicAuthContext* auth_ctx, uint8_t sector) {
|
|
furi_assert(auth_ctx);
|
|
auth_ctx->sector = sector;
|
|
auth_ctx->key_a = MF_CLASSIC_NO_KEY;
|
|
auth_ctx->key_b = MF_CLASSIC_NO_KEY;
|
|
}
|
|
|
|
static bool mf_classic_auth(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
uint32_t block,
|
|
uint64_t key,
|
|
MfClassicKey key_type,
|
|
Crypto1* crypto,
|
|
bool skip_activate,
|
|
uint32_t cuid) {
|
|
bool auth_success = false;
|
|
memset(tx_rx->tx_data, 0, sizeof(tx_rx->tx_data));
|
|
memset(tx_rx->tx_parity, 0, sizeof(tx_rx->tx_parity));
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
|
|
|
|
do {
|
|
if(!skip_activate && !furi_hal_nfc_activate_nfca(200, &cuid)) break;
|
|
if(key_type == MfClassicKeyA) {
|
|
tx_rx->tx_data[0] = MF_CLASSIC_AUTH_KEY_A_CMD;
|
|
} else {
|
|
tx_rx->tx_data[0] = MF_CLASSIC_AUTH_KEY_B_CMD;
|
|
}
|
|
tx_rx->tx_data[1] = block;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRxNoCrc;
|
|
tx_rx->tx_bits = 2 * 8;
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 6)) break;
|
|
|
|
uint32_t nt = (uint32_t)nfc_util_bytes2num(tx_rx->rx_data, 4);
|
|
crypto1_init(crypto, key);
|
|
crypto1_word(crypto, nt ^ cuid, 0);
|
|
uint8_t nr[4] = {};
|
|
nfc_util_num2bytes(prng_successor(DWT->CYCCNT, 32), 4, nr);
|
|
for(uint8_t i = 0; i < 4; i++) {
|
|
tx_rx->tx_data[i] = crypto1_byte(crypto, nr[i], 0) ^ nr[i];
|
|
tx_rx->tx_parity[0] |=
|
|
(((crypto1_filter(crypto->odd) ^ nfc_util_odd_parity8(nr[i])) & 0x01) << (7 - i));
|
|
}
|
|
nt = prng_successor(nt, 32);
|
|
for(uint8_t i = 4; i < 8; i++) {
|
|
nt = prng_successor(nt, 8);
|
|
tx_rx->tx_data[i] = crypto1_byte(crypto, 0x00, 0) ^ (nt & 0xff);
|
|
tx_rx->tx_parity[0] |=
|
|
(((crypto1_filter(crypto->odd) ^ nfc_util_odd_parity8(nt & 0xff)) & 0x01)
|
|
<< (7 - i));
|
|
}
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
tx_rx->tx_bits = 8 * 8;
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 6)) break;
|
|
if(tx_rx->rx_bits == 32) {
|
|
crypto1_word(crypto, 0, 0);
|
|
auth_success = true;
|
|
}
|
|
} while(false);
|
|
|
|
return auth_success;
|
|
}
|
|
|
|
bool mf_classic_authenticate(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
uint8_t block_num,
|
|
uint64_t key,
|
|
MfClassicKey key_type) {
|
|
furi_assert(tx_rx);
|
|
|
|
Crypto1 crypto = {};
|
|
bool key_found = mf_classic_auth(tx_rx, block_num, key, key_type, &crypto, false, 0);
|
|
furi_hal_nfc_sleep();
|
|
return key_found;
|
|
}
|
|
|
|
bool mf_classic_authenticate_skip_activate(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
uint8_t block_num,
|
|
uint64_t key,
|
|
MfClassicKey key_type,
|
|
bool skip_activate,
|
|
uint32_t cuid) {
|
|
furi_assert(tx_rx);
|
|
|
|
Crypto1 crypto = {};
|
|
bool key_found =
|
|
mf_classic_auth(tx_rx, block_num, key, key_type, &crypto, skip_activate, cuid);
|
|
furi_hal_nfc_sleep();
|
|
return key_found;
|
|
}
|
|
|
|
bool mf_classic_auth_attempt(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
Crypto1* crypto,
|
|
MfClassicAuthContext* auth_ctx,
|
|
uint64_t key) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(auth_ctx);
|
|
bool found_key = false;
|
|
bool need_halt = (auth_ctx->key_a == MF_CLASSIC_NO_KEY) &&
|
|
(auth_ctx->key_b == MF_CLASSIC_NO_KEY);
|
|
|
|
if(auth_ctx->key_a == MF_CLASSIC_NO_KEY) {
|
|
// Try AUTH with key A
|
|
if(mf_classic_auth(
|
|
tx_rx,
|
|
mf_classic_get_sector_trailer_block_num_by_sector(auth_ctx->sector),
|
|
key,
|
|
MfClassicKeyA,
|
|
crypto,
|
|
false,
|
|
0)) {
|
|
auth_ctx->key_a = key;
|
|
found_key = true;
|
|
}
|
|
}
|
|
|
|
if(need_halt) {
|
|
furi_hal_nfc_sleep();
|
|
}
|
|
|
|
if(auth_ctx->key_b == MF_CLASSIC_NO_KEY) {
|
|
// Try AUTH with key B
|
|
if(mf_classic_auth(
|
|
tx_rx,
|
|
mf_classic_get_sector_trailer_block_num_by_sector(auth_ctx->sector),
|
|
key,
|
|
MfClassicKeyB,
|
|
crypto,
|
|
false,
|
|
0)) {
|
|
auth_ctx->key_b = key;
|
|
found_key = true;
|
|
}
|
|
}
|
|
|
|
return found_key;
|
|
}
|
|
|
|
bool mf_classic_read_block(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
Crypto1* crypto,
|
|
uint8_t block_num,
|
|
MfClassicBlock* block) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(crypto);
|
|
furi_assert(block);
|
|
|
|
bool read_block_success = false;
|
|
uint8_t plain_cmd[4] = {MF_CLASSIC_READ_BLOCK_CMD, block_num, 0x00, 0x00};
|
|
nfca_append_crc16(plain_cmd, 2);
|
|
|
|
crypto1_encrypt(
|
|
crypto, NULL, plain_cmd, sizeof(plain_cmd) * 8, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_bits = sizeof(plain_cmd) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
|
|
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
|
|
if(tx_rx->rx_bits == 8 * (MF_CLASSIC_BLOCK_SIZE + 2)) {
|
|
uint8_t block_received[MF_CLASSIC_BLOCK_SIZE + 2];
|
|
crypto1_decrypt(crypto, tx_rx->rx_data, tx_rx->rx_bits, block_received);
|
|
uint16_t crc_calc = nfca_get_crc16(block_received, MF_CLASSIC_BLOCK_SIZE);
|
|
uint16_t crc_received = (block_received[MF_CLASSIC_BLOCK_SIZE + 1] << 8) |
|
|
block_received[MF_CLASSIC_BLOCK_SIZE];
|
|
if(crc_received != crc_calc) {
|
|
FURI_LOG_E(
|
|
TAG,
|
|
"Incorrect CRC while reading block %d. Expected %04X, Received %04X",
|
|
block_num,
|
|
crc_received,
|
|
crc_calc);
|
|
} else {
|
|
memcpy(block->value, block_received, MF_CLASSIC_BLOCK_SIZE);
|
|
read_block_success = true;
|
|
}
|
|
}
|
|
}
|
|
return read_block_success;
|
|
}
|
|
|
|
void mf_classic_read_sector(FuriHalNfcTxRxContext* tx_rx, MfClassicData* data, uint8_t sec_num) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(data);
|
|
|
|
furi_hal_nfc_sleep();
|
|
bool key_a_found = mf_classic_is_key_found(data, sec_num, MfClassicKeyA);
|
|
bool key_b_found = mf_classic_is_key_found(data, sec_num, MfClassicKeyB);
|
|
uint8_t start_block = mf_classic_get_first_block_num_of_sector(sec_num);
|
|
uint8_t total_blocks = mf_classic_get_blocks_num_in_sector(sec_num);
|
|
MfClassicBlock block_tmp = {};
|
|
uint64_t key = 0;
|
|
MfClassicSectorTrailer* sec_tr = mf_classic_get_sector_trailer_by_sector(data, sec_num);
|
|
Crypto1 crypto = {};
|
|
|
|
uint8_t blocks_read = 0;
|
|
do {
|
|
if(!key_a_found) break;
|
|
FURI_LOG_D(TAG, "Try to read blocks with key A");
|
|
key = nfc_util_bytes2num(sec_tr->key_a, sizeof(sec_tr->key_a));
|
|
if(!mf_classic_auth(tx_rx, start_block, key, MfClassicKeyA, &crypto, false, 0)) {
|
|
mf_classic_set_key_not_found(data, sec_num, MfClassicKeyA);
|
|
FURI_LOG_D(TAG, "Key %dA not found in read", sec_num);
|
|
break;
|
|
}
|
|
|
|
for(size_t i = start_block; i < start_block + total_blocks; i++) {
|
|
if(!mf_classic_is_block_read(data, i)) {
|
|
if(mf_classic_read_block(tx_rx, &crypto, i, &block_tmp)) {
|
|
mf_classic_set_block_read(data, i, &block_tmp);
|
|
blocks_read++;
|
|
} else if(i > start_block) {
|
|
// Try to re-auth to read block in case prevous block was protected from read
|
|
furi_hal_nfc_sleep();
|
|
if(!mf_classic_auth(tx_rx, i, key, MfClassicKeyA, &crypto, false, 0)) {
|
|
mf_classic_set_key_not_found(data, sec_num, MfClassicKeyA);
|
|
FURI_LOG_D(TAG, "Key %dA not found in read", sec_num);
|
|
break;
|
|
}
|
|
if(mf_classic_read_block(tx_rx, &crypto, i, &block_tmp)) {
|
|
mf_classic_set_block_read(data, i, &block_tmp);
|
|
blocks_read++;
|
|
}
|
|
}
|
|
} else {
|
|
blocks_read++;
|
|
}
|
|
}
|
|
FURI_LOG_D(TAG, "Read %d blocks out of %d", blocks_read, total_blocks);
|
|
} while(false);
|
|
do {
|
|
if(blocks_read == total_blocks) break;
|
|
if(!key_b_found) break;
|
|
if(key_a_found) {
|
|
furi_hal_nfc_sleep();
|
|
}
|
|
FURI_LOG_D(TAG, "Try to read blocks with key B");
|
|
key = nfc_util_bytes2num(sec_tr->key_b, sizeof(sec_tr->key_b));
|
|
if(!mf_classic_auth(tx_rx, start_block, key, MfClassicKeyB, &crypto, false, 0)) {
|
|
mf_classic_set_key_not_found(data, sec_num, MfClassicKeyB);
|
|
FURI_LOG_D(TAG, "Key %dB not found in read", sec_num);
|
|
break;
|
|
}
|
|
|
|
for(size_t i = start_block; i < start_block + total_blocks; i++) {
|
|
if(!mf_classic_is_block_read(data, i)) {
|
|
if(mf_classic_read_block(tx_rx, &crypto, i, &block_tmp)) {
|
|
mf_classic_set_block_read(data, i, &block_tmp);
|
|
blocks_read++;
|
|
} else if(i > start_block) {
|
|
// Try to re-auth to read block in case prevous block was protected from read
|
|
furi_hal_nfc_sleep();
|
|
if(!mf_classic_auth(tx_rx, i, key, MfClassicKeyB, &crypto, false, 0)) {
|
|
mf_classic_set_key_not_found(data, sec_num, MfClassicKeyB);
|
|
FURI_LOG_D(TAG, "Key %dB not found in read", sec_num);
|
|
break;
|
|
}
|
|
if(mf_classic_read_block(tx_rx, &crypto, i, &block_tmp)) {
|
|
mf_classic_set_block_read(data, i, &block_tmp);
|
|
blocks_read++;
|
|
}
|
|
}
|
|
} else {
|
|
blocks_read++;
|
|
}
|
|
}
|
|
FURI_LOG_D(TAG, "Read %d blocks out of %d", blocks_read, total_blocks);
|
|
} while(false);
|
|
}
|
|
|
|
static bool mf_classic_read_sector_with_reader(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
Crypto1* crypto,
|
|
MfClassicSectorReader* sector_reader,
|
|
MfClassicSector* sector) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(sector_reader);
|
|
furi_assert(sector);
|
|
|
|
uint64_t key;
|
|
MfClassicKey key_type;
|
|
uint8_t first_block;
|
|
bool sector_read = false;
|
|
|
|
furi_hal_nfc_sleep();
|
|
do {
|
|
// Activate card
|
|
first_block = mf_classic_get_first_block_num_of_sector(sector_reader->sector_num);
|
|
if(sector_reader->key_a != MF_CLASSIC_NO_KEY) {
|
|
key = sector_reader->key_a;
|
|
key_type = MfClassicKeyA;
|
|
} else if(sector_reader->key_b != MF_CLASSIC_NO_KEY) {
|
|
key = sector_reader->key_b;
|
|
key_type = MfClassicKeyB;
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
// Auth to first block in sector
|
|
if(!mf_classic_auth(tx_rx, first_block, key, key_type, crypto, false, 0)) {
|
|
// Set key to MF_CLASSIC_NO_KEY to prevent further attempts
|
|
if(key_type == MfClassicKeyA) {
|
|
sector_reader->key_a = MF_CLASSIC_NO_KEY;
|
|
} else {
|
|
sector_reader->key_b = MF_CLASSIC_NO_KEY;
|
|
}
|
|
break;
|
|
}
|
|
sector->total_blocks = mf_classic_get_blocks_num_in_sector(sector_reader->sector_num);
|
|
|
|
// Read blocks
|
|
for(uint8_t i = 0; i < sector->total_blocks; i++) {
|
|
if(mf_classic_read_block(tx_rx, crypto, first_block + i, §or->block[i])) continue;
|
|
if(i == 0) continue;
|
|
// Try to auth to read next block in case previous is locked
|
|
furi_hal_nfc_sleep();
|
|
if(!mf_classic_auth(tx_rx, first_block + i, key, key_type, crypto, false, 0)) continue;
|
|
mf_classic_read_block(tx_rx, crypto, first_block + i, §or->block[i]);
|
|
}
|
|
// Save sector keys in last block
|
|
if(sector_reader->key_a != MF_CLASSIC_NO_KEY) {
|
|
nfc_util_num2bytes(
|
|
sector_reader->key_a, 6, §or->block[sector->total_blocks - 1].value[0]);
|
|
}
|
|
if(sector_reader->key_b != MF_CLASSIC_NO_KEY) {
|
|
nfc_util_num2bytes(
|
|
sector_reader->key_b, 6, §or->block[sector->total_blocks - 1].value[10]);
|
|
}
|
|
|
|
sector_read = true;
|
|
} while(false);
|
|
|
|
return sector_read;
|
|
}
|
|
|
|
uint8_t mf_classic_read_card(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
MfClassicReader* reader,
|
|
MfClassicData* data) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(reader);
|
|
furi_assert(data);
|
|
|
|
uint8_t sectors_read = 0;
|
|
data->type = reader->type;
|
|
data->key_a_mask = 0;
|
|
data->key_b_mask = 0;
|
|
MfClassicSector temp_sector = {};
|
|
for(uint8_t i = 0; i < reader->sectors_to_read; i++) {
|
|
if(mf_classic_read_sector_with_reader(
|
|
tx_rx, &reader->crypto, &reader->sector_reader[i], &temp_sector)) {
|
|
uint8_t first_block =
|
|
mf_classic_get_first_block_num_of_sector(reader->sector_reader[i].sector_num);
|
|
for(uint8_t j = 0; j < temp_sector.total_blocks; j++) {
|
|
mf_classic_set_block_read(data, first_block + j, &temp_sector.block[j]);
|
|
}
|
|
if(reader->sector_reader[i].key_a != MF_CLASSIC_NO_KEY) {
|
|
mf_classic_set_key_found(
|
|
data,
|
|
reader->sector_reader[i].sector_num,
|
|
MfClassicKeyA,
|
|
reader->sector_reader[i].key_a);
|
|
}
|
|
if(reader->sector_reader[i].key_b != MF_CLASSIC_NO_KEY) {
|
|
mf_classic_set_key_found(
|
|
data,
|
|
reader->sector_reader[i].sector_num,
|
|
MfClassicKeyB,
|
|
reader->sector_reader[i].key_b);
|
|
}
|
|
sectors_read++;
|
|
}
|
|
}
|
|
|
|
return sectors_read;
|
|
}
|
|
|
|
uint8_t mf_classic_update_card(FuriHalNfcTxRxContext* tx_rx, MfClassicData* data) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(data);
|
|
|
|
uint8_t total_sectors = mf_classic_get_total_sectors_num(data->type);
|
|
|
|
for(size_t i = 0; i < total_sectors; i++) {
|
|
mf_classic_read_sector(tx_rx, data, i);
|
|
}
|
|
uint8_t sectors_read = 0;
|
|
uint8_t keys_found = 0;
|
|
mf_classic_get_read_sectors_and_keys(data, §ors_read, &keys_found);
|
|
FURI_LOG_D(TAG, "Read %d sectors and %d keys", sectors_read, keys_found);
|
|
|
|
return sectors_read;
|
|
}
|
|
|
|
bool mf_classic_emulator(
|
|
MfClassicEmulator* emulator,
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
bool is_reader_analyzer) {
|
|
furi_assert(emulator);
|
|
furi_assert(tx_rx);
|
|
uint8_t plain_data[MF_CLASSIC_MAX_DATA_SIZE];
|
|
MfClassicKey access_key = MfClassicKeyA;
|
|
bool need_reset = false;
|
|
bool need_nack = false;
|
|
bool is_encrypted = false;
|
|
uint8_t sector = 0;
|
|
|
|
// Used for decrement and increment - copy to block on transfer
|
|
uint8_t transfer_buf[MF_CLASSIC_BLOCK_SIZE];
|
|
bool transfer_buf_valid = false;
|
|
|
|
// Process commands
|
|
while(!need_reset && !need_nack) { //-V654
|
|
memset(plain_data, 0, MF_CLASSIC_MAX_DATA_SIZE);
|
|
if(!is_encrypted) {
|
|
crypto1_reset(&emulator->crypto);
|
|
memcpy(plain_data, tx_rx->rx_data, tx_rx->rx_bits / 8);
|
|
} else {
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) {
|
|
FURI_LOG_D(
|
|
TAG,
|
|
"Error in tx rx. Tx: %d bits, Rx: %d bits",
|
|
tx_rx->tx_bits,
|
|
tx_rx->rx_bits);
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
crypto1_decrypt(&emulator->crypto, tx_rx->rx_data, tx_rx->rx_bits, plain_data);
|
|
}
|
|
|
|
// After increment, decrement or restore the only allowed command is transfer
|
|
uint8_t cmd = plain_data[0];
|
|
if(transfer_buf_valid && cmd != MF_CLASSIC_TRANSFER_CMD) {
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
if(cmd == NFCA_CMD_HALT && plain_data[1] == 0x00) {
|
|
FURI_LOG_T(TAG, "Halt received");
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
if(cmd == NFCA_CMD_RATS) {
|
|
// Mifare Classic doesn't support ATS, NACK it and start listening again
|
|
FURI_LOG_T(TAG, "RATS received");
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
if(cmd == MF_CLASSIC_AUTH_KEY_A_CMD || cmd == MF_CLASSIC_AUTH_KEY_B_CMD) {
|
|
uint8_t block = plain_data[1];
|
|
uint64_t key = 0;
|
|
uint8_t sector_trailer_block = mf_classic_get_sector_trailer_num_by_block(block);
|
|
sector = mf_classic_get_sector_by_block(block);
|
|
MfClassicSectorTrailer* sector_trailer =
|
|
(MfClassicSectorTrailer*)emulator->data.block[sector_trailer_block].value;
|
|
if(cmd == MF_CLASSIC_AUTH_KEY_A_CMD) {
|
|
if(mf_classic_is_key_found(
|
|
&emulator->data, mf_classic_get_sector_by_block(block), MfClassicKeyA) ||
|
|
is_reader_analyzer) {
|
|
key = nfc_util_bytes2num(sector_trailer->key_a, 6);
|
|
access_key = MfClassicKeyA;
|
|
} else {
|
|
FURI_LOG_D(TAG, "Key not known");
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
} else {
|
|
if(mf_classic_is_key_found(
|
|
&emulator->data, mf_classic_get_sector_by_block(block), MfClassicKeyB) ||
|
|
is_reader_analyzer) {
|
|
key = nfc_util_bytes2num(sector_trailer->key_b, 6);
|
|
access_key = MfClassicKeyB;
|
|
} else {
|
|
FURI_LOG_D(TAG, "Key not known");
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint32_t nonce = prng_successor(DWT->CYCCNT, 32) ^ 0xAA;
|
|
uint8_t nt[4];
|
|
uint8_t nt_keystream[4];
|
|
nfc_util_num2bytes(nonce, 4, nt);
|
|
nfc_util_num2bytes(nonce ^ emulator->cuid, 4, nt_keystream);
|
|
crypto1_init(&emulator->crypto, key);
|
|
if(!is_encrypted) {
|
|
crypto1_word(&emulator->crypto, emulator->cuid ^ nonce, 0);
|
|
memcpy(tx_rx->tx_data, nt, sizeof(nt));
|
|
tx_rx->tx_parity[0] = 0;
|
|
nfc_util_odd_parity(tx_rx->tx_data, tx_rx->tx_parity, sizeof(nt));
|
|
tx_rx->tx_bits = sizeof(nt) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
} else {
|
|
crypto1_encrypt(
|
|
&emulator->crypto,
|
|
nt_keystream,
|
|
nt,
|
|
sizeof(nt) * 8,
|
|
tx_rx->tx_data,
|
|
tx_rx->tx_parity);
|
|
tx_rx->tx_bits = sizeof(nt) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
}
|
|
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 500)) {
|
|
FURI_LOG_E(TAG, "Error in NT exchange");
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
if(tx_rx->rx_bits != 64) {
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
uint32_t nr = nfc_util_bytes2num(tx_rx->rx_data, 4);
|
|
uint32_t ar = nfc_util_bytes2num(&tx_rx->rx_data[4], 4);
|
|
|
|
crypto1_word(&emulator->crypto, nr, 1);
|
|
uint32_t cardRr = ar ^ crypto1_word(&emulator->crypto, 0, 0);
|
|
if(cardRr != prng_successor(nonce, 64)) {
|
|
FURI_LOG_T(
|
|
TAG,
|
|
"Wrong AUTH on block %u! %08lX != %08lX",
|
|
block,
|
|
cardRr,
|
|
prng_successor(nonce, 64));
|
|
// Don't send NACK, as the tag doesn't send it
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
uint32_t ans = prng_successor(nonce, 96);
|
|
uint8_t response[4] = {};
|
|
nfc_util_num2bytes(ans, 4, response);
|
|
crypto1_encrypt(
|
|
&emulator->crypto,
|
|
NULL,
|
|
response,
|
|
sizeof(response) * 8,
|
|
tx_rx->tx_data,
|
|
tx_rx->tx_parity);
|
|
tx_rx->tx_bits = sizeof(response) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
|
|
is_encrypted = true;
|
|
continue;
|
|
}
|
|
|
|
if(!is_encrypted) {
|
|
FURI_LOG_T(TAG, "Invalid command before auth session established: %02X", cmd);
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
// Mifare Classic commands always have block number after command
|
|
uint8_t block = plain_data[1];
|
|
if(mf_classic_get_sector_by_block(block) != sector) {
|
|
// Don't allow access to sectors other than authorized
|
|
FURI_LOG_T(
|
|
TAG,
|
|
"Trying to access block %u from not authorized sector (command: %02X)",
|
|
block,
|
|
cmd);
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
switch(cmd) {
|
|
case MF_CLASSIC_READ_BLOCK_CMD: {
|
|
uint8_t block_data[MF_CLASSIC_BLOCK_SIZE + 2] = {};
|
|
memcpy(block_data, emulator->data.block[block].value, MF_CLASSIC_BLOCK_SIZE);
|
|
if(mf_classic_is_sector_trailer(block)) {
|
|
if(!mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionKeyARead)) {
|
|
memset(block_data, 0, 6); //-V1086
|
|
}
|
|
if(!mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionKeyBRead)) {
|
|
memset(&block_data[10], 0, 6);
|
|
}
|
|
if(!mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionACRead)) {
|
|
memset(&block_data[6], 0, 4);
|
|
}
|
|
} else if(
|
|
!mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionDataRead) ||
|
|
!mf_classic_is_block_read(&emulator->data, block)) {
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
nfca_append_crc16(block_data, 16);
|
|
|
|
crypto1_encrypt(
|
|
&emulator->crypto,
|
|
NULL,
|
|
block_data,
|
|
sizeof(block_data) * 8,
|
|
tx_rx->tx_data,
|
|
tx_rx->tx_parity);
|
|
tx_rx->tx_bits = (MF_CLASSIC_BLOCK_SIZE + 2) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
break;
|
|
}
|
|
|
|
case MF_CLASSIC_WRITE_BLOCK_CMD: {
|
|
// Send ACK
|
|
uint8_t ack = MF_CLASSIC_ACK_CMD;
|
|
crypto1_encrypt(&emulator->crypto, NULL, &ack, 4, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
tx_rx->tx_bits = 4;
|
|
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) {
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
if(tx_rx->rx_bits != (MF_CLASSIC_BLOCK_SIZE + 2) * 8) {
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
crypto1_decrypt(&emulator->crypto, tx_rx->rx_data, tx_rx->rx_bits, plain_data);
|
|
uint8_t block_data[MF_CLASSIC_BLOCK_SIZE] = {};
|
|
memcpy(block_data, emulator->data.block[block].value, MF_CLASSIC_BLOCK_SIZE);
|
|
|
|
if(!mf_classic_is_block_read(&emulator->data, block)) {
|
|
// Don't allow writing to the block for which we haven't read data yet
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
if(mf_classic_is_sector_trailer(block)) {
|
|
if(mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionKeyAWrite)) {
|
|
memcpy(block_data, plain_data, 6); //-V1086
|
|
}
|
|
if(mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionKeyBWrite)) {
|
|
memcpy(&block_data[10], &plain_data[10], 6);
|
|
}
|
|
if(mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionACWrite)) {
|
|
memcpy(&block_data[6], &plain_data[6], 4);
|
|
}
|
|
} else {
|
|
if(mf_classic_is_allowed_access(
|
|
emulator, block, access_key, MfClassicActionDataWrite)) {
|
|
memcpy(block_data, plain_data, MF_CLASSIC_BLOCK_SIZE);
|
|
} else {
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(memcmp(block_data, emulator->data.block[block].value, MF_CLASSIC_BLOCK_SIZE) != 0) {
|
|
memcpy(emulator->data.block[block].value, block_data, MF_CLASSIC_BLOCK_SIZE);
|
|
emulator->data_changed = true;
|
|
}
|
|
|
|
// Send ACK
|
|
ack = MF_CLASSIC_ACK_CMD;
|
|
crypto1_encrypt(&emulator->crypto, NULL, &ack, 4, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
tx_rx->tx_bits = 4;
|
|
break;
|
|
}
|
|
|
|
case MF_CLASSIC_DECREMENT_CMD:
|
|
case MF_CLASSIC_INCREMENT_CMD:
|
|
case MF_CLASSIC_RESTORE_CMD: {
|
|
MfClassicAction action = (cmd == MF_CLASSIC_INCREMENT_CMD) ? MfClassicActionDataInc :
|
|
MfClassicActionDataDec;
|
|
|
|
if(!mf_classic_is_allowed_access(emulator, block, access_key, action)) {
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
int32_t prev_value;
|
|
uint8_t addr;
|
|
if(!mf_classic_block_to_value(emulator->data.block[block].value, &prev_value, &addr)) {
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
|
|
// Send ACK
|
|
uint8_t ack = MF_CLASSIC_ACK_CMD;
|
|
crypto1_encrypt(&emulator->crypto, NULL, &ack, 4, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
tx_rx->tx_bits = 4;
|
|
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) {
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
if(tx_rx->rx_bits != (sizeof(int32_t) + 2) * 8) {
|
|
need_reset = true;
|
|
break;
|
|
}
|
|
|
|
crypto1_decrypt(&emulator->crypto, tx_rx->rx_data, tx_rx->rx_bits, plain_data);
|
|
int32_t value = *(int32_t*)&plain_data[0];
|
|
if(value < 0) {
|
|
value = -value;
|
|
}
|
|
if(cmd == MF_CLASSIC_DECREMENT_CMD) {
|
|
value = -value;
|
|
} else if(cmd == MF_CLASSIC_RESTORE_CMD) {
|
|
value = 0;
|
|
}
|
|
|
|
mf_classic_value_to_block(prev_value + value, addr, transfer_buf);
|
|
transfer_buf_valid = true;
|
|
// Commands do not ACK
|
|
tx_rx->tx_bits = 0;
|
|
break;
|
|
}
|
|
|
|
case MF_CLASSIC_TRANSFER_CMD: {
|
|
if(!mf_classic_is_allowed_access(emulator, block, access_key, MfClassicActionDataDec)) {
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
if(memcmp(transfer_buf, emulator->data.block[block].value, MF_CLASSIC_BLOCK_SIZE) !=
|
|
0) {
|
|
memcpy(emulator->data.block[block].value, transfer_buf, MF_CLASSIC_BLOCK_SIZE);
|
|
emulator->data_changed = true;
|
|
}
|
|
transfer_buf_valid = false;
|
|
|
|
uint8_t ack = MF_CLASSIC_ACK_CMD;
|
|
crypto1_encrypt(&emulator->crypto, NULL, &ack, 4, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
tx_rx->tx_bits = 4;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
FURI_LOG_T(TAG, "Unknown command: %02X", cmd);
|
|
need_nack = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(need_nack && !need_reset) {
|
|
// Send NACK
|
|
uint8_t nack = transfer_buf_valid ? MF_CLASSIC_NACK_BUF_VALID_CMD :
|
|
MF_CLASSIC_NACK_BUF_INVALID_CMD;
|
|
if(is_encrypted) {
|
|
crypto1_encrypt(&emulator->crypto, NULL, &nack, 4, tx_rx->tx_data, tx_rx->tx_parity);
|
|
} else {
|
|
tx_rx->tx_data[0] = nack;
|
|
}
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
|
|
tx_rx->tx_bits = 4;
|
|
furi_hal_nfc_tx_rx(tx_rx, 300);
|
|
need_reset = true;
|
|
}
|
|
|
|
return !need_reset;
|
|
}
|
|
|
|
void mf_classic_halt(FuriHalNfcTxRxContext* tx_rx, Crypto1* crypto) {
|
|
furi_assert(tx_rx);
|
|
|
|
uint8_t plain_data[4] = {NFCA_CMD_HALT, 0x00, 0x00, 0x00};
|
|
|
|
nfca_append_crc16(plain_data, 2);
|
|
if(crypto) {
|
|
crypto1_encrypt(
|
|
crypto, NULL, plain_data, sizeof(plain_data) * 8, tx_rx->tx_data, tx_rx->tx_parity);
|
|
} else {
|
|
memcpy(tx_rx->tx_data, plain_data, sizeof(plain_data));
|
|
nfc_util_odd_parity(tx_rx->tx_data, tx_rx->tx_parity, sizeof(plain_data));
|
|
}
|
|
|
|
tx_rx->tx_bits = sizeof(plain_data) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
furi_hal_nfc_tx_rx(tx_rx, 50);
|
|
}
|
|
|
|
bool mf_classic_write_block(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
Crypto1* crypto,
|
|
uint8_t block_num,
|
|
MfClassicBlock* src_block) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(crypto);
|
|
furi_assert(src_block);
|
|
|
|
bool write_success = false;
|
|
uint8_t plain_data[MF_CLASSIC_BLOCK_SIZE + 2] = {};
|
|
uint8_t resp;
|
|
|
|
do {
|
|
// Send write command
|
|
plain_data[0] = MF_CLASSIC_WRITE_BLOCK_CMD;
|
|
plain_data[1] = block_num;
|
|
nfca_append_crc16(plain_data, 2);
|
|
crypto1_encrypt(crypto, NULL, plain_data, 4 * 8, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_bits = 4 * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
|
|
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
|
|
if(tx_rx->rx_bits == 4) {
|
|
crypto1_decrypt(crypto, tx_rx->rx_data, 4, &resp);
|
|
if(resp != 0x0A) {
|
|
FURI_LOG_D(TAG, "NACK received on write cmd: %02X", resp);
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Not ACK received");
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Failed to send write cmd");
|
|
break;
|
|
}
|
|
|
|
// Send data
|
|
memcpy(plain_data, src_block->value, MF_CLASSIC_BLOCK_SIZE);
|
|
nfca_append_crc16(plain_data, MF_CLASSIC_BLOCK_SIZE);
|
|
crypto1_encrypt(
|
|
crypto,
|
|
NULL,
|
|
plain_data,
|
|
(MF_CLASSIC_BLOCK_SIZE + 2) * 8,
|
|
tx_rx->tx_data,
|
|
tx_rx->tx_parity);
|
|
tx_rx->tx_bits = (MF_CLASSIC_BLOCK_SIZE + 2) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
|
|
if(tx_rx->rx_bits == 4) {
|
|
crypto1_decrypt(crypto, tx_rx->rx_data, 4, &resp);
|
|
if(resp != MF_CLASSIC_ACK_CMD) {
|
|
FURI_LOG_D(TAG, "NACK received on sending data");
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Not ACK received");
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Failed to send data");
|
|
break;
|
|
}
|
|
|
|
write_success = true;
|
|
} while(false);
|
|
|
|
return write_success;
|
|
}
|
|
|
|
bool mf_classic_auth_write_block(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
MfClassicBlock* src_block,
|
|
uint8_t block_num,
|
|
MfClassicKey key_type,
|
|
uint64_t key) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(src_block);
|
|
|
|
Crypto1 crypto = {};
|
|
bool write_success = false;
|
|
|
|
do {
|
|
furi_hal_nfc_sleep();
|
|
if(!mf_classic_auth(tx_rx, block_num, key, key_type, &crypto, false, 0)) {
|
|
FURI_LOG_D(TAG, "Auth fail");
|
|
break;
|
|
}
|
|
|
|
if(!mf_classic_write_block(tx_rx, &crypto, block_num, src_block)) {
|
|
FURI_LOG_D(TAG, "Write fail");
|
|
break;
|
|
}
|
|
write_success = true;
|
|
|
|
mf_classic_halt(tx_rx, &crypto);
|
|
} while(false);
|
|
|
|
return write_success;
|
|
}
|
|
|
|
bool mf_classic_transfer(FuriHalNfcTxRxContext* tx_rx, Crypto1* crypto, uint8_t block_num) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(crypto);
|
|
|
|
// Send transfer command
|
|
uint8_t plain_data[4] = {MF_CLASSIC_TRANSFER_CMD, block_num, 0, 0};
|
|
uint8_t resp = 0;
|
|
bool transfer_success = false;
|
|
|
|
nfca_append_crc16(plain_data, 2);
|
|
crypto1_encrypt(
|
|
crypto, NULL, plain_data, sizeof(plain_data) * 8, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_bits = sizeof(plain_data) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
|
|
do {
|
|
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
|
|
if(tx_rx->rx_bits == 4) {
|
|
crypto1_decrypt(crypto, tx_rx->rx_data, 4, &resp);
|
|
if(resp != 0x0A) {
|
|
FURI_LOG_D(TAG, "NACK received on transfer cmd: %02X", resp);
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Not ACK received");
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Failed to send transfer cmd");
|
|
break;
|
|
}
|
|
|
|
transfer_success = true;
|
|
} while(false);
|
|
|
|
return transfer_success;
|
|
}
|
|
|
|
bool mf_classic_value_cmd(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
Crypto1* crypto,
|
|
uint8_t block_num,
|
|
uint8_t cmd,
|
|
int32_t d_value) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(crypto);
|
|
furi_assert(
|
|
cmd == MF_CLASSIC_INCREMENT_CMD || cmd == MF_CLASSIC_DECREMENT_CMD ||
|
|
cmd == MF_CLASSIC_RESTORE_CMD);
|
|
furi_assert(d_value >= 0);
|
|
|
|
uint8_t plain_data[sizeof(d_value) + 2] = {};
|
|
uint8_t resp = 0;
|
|
bool success = false;
|
|
|
|
do {
|
|
// Send cmd
|
|
plain_data[0] = cmd;
|
|
plain_data[1] = block_num;
|
|
nfca_append_crc16(plain_data, 2);
|
|
crypto1_encrypt(crypto, NULL, plain_data, 4 * 8, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_bits = 4 * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
|
|
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
|
|
if(tx_rx->rx_bits == 4) {
|
|
crypto1_decrypt(crypto, tx_rx->rx_data, 4, &resp);
|
|
if(resp != 0x0A) {
|
|
FURI_LOG_D(TAG, "NACK received on write cmd: %02X", resp);
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Not ACK received");
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Failed to send write cmd");
|
|
break;
|
|
}
|
|
|
|
// Send data
|
|
memcpy(plain_data, &d_value, sizeof(d_value));
|
|
nfca_append_crc16(plain_data, sizeof(d_value));
|
|
crypto1_encrypt(
|
|
crypto, NULL, plain_data, (sizeof(d_value) + 2) * 8, tx_rx->tx_data, tx_rx->tx_parity);
|
|
tx_rx->tx_bits = (sizeof(d_value) + 2) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeRaw;
|
|
// inc, dec, restore do not ACK, but they do NACK
|
|
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
|
|
if(tx_rx->rx_bits == 4) {
|
|
crypto1_decrypt(crypto, tx_rx->rx_data, 4, &resp);
|
|
if(resp != 0x0A) {
|
|
FURI_LOG_D(TAG, "NACK received on transfer cmd: %02X", resp);
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Not NACK received");
|
|
break;
|
|
}
|
|
}
|
|
|
|
success = true;
|
|
|
|
} while(false);
|
|
|
|
return success;
|
|
}
|
|
|
|
bool mf_classic_value_cmd_full(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
MfClassicBlock* src_block,
|
|
uint8_t block_num,
|
|
MfClassicKey key_type,
|
|
uint64_t key,
|
|
int32_t d_value) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(src_block);
|
|
|
|
Crypto1 crypto = {};
|
|
uint8_t cmd;
|
|
bool success = false;
|
|
|
|
if(d_value > 0) {
|
|
cmd = MF_CLASSIC_INCREMENT_CMD;
|
|
} else if(d_value < 0) {
|
|
cmd = MF_CLASSIC_DECREMENT_CMD;
|
|
d_value = -d_value;
|
|
} else {
|
|
cmd = MF_CLASSIC_RESTORE_CMD;
|
|
}
|
|
|
|
do {
|
|
furi_hal_nfc_sleep();
|
|
if(!mf_classic_auth(tx_rx, block_num, key, key_type, &crypto, false, 0)) {
|
|
FURI_LOG_D(TAG, "Value cmd auth fail");
|
|
break;
|
|
}
|
|
if(!mf_classic_value_cmd(tx_rx, &crypto, block_num, cmd, d_value)) {
|
|
FURI_LOG_D(TAG, "Value cmd inc/dec/res fail");
|
|
break;
|
|
}
|
|
|
|
if(!mf_classic_transfer(tx_rx, &crypto, block_num)) {
|
|
FURI_LOG_D(TAG, "Value cmd transfer fail");
|
|
break;
|
|
}
|
|
|
|
success = true;
|
|
|
|
// Send Halt
|
|
mf_classic_halt(tx_rx, &crypto);
|
|
} while(false);
|
|
|
|
return success;
|
|
}
|
|
|
|
bool mf_classic_write_sector(
|
|
FuriHalNfcTxRxContext* tx_rx,
|
|
MfClassicData* dest_data,
|
|
MfClassicData* src_data,
|
|
uint8_t sec_num) {
|
|
furi_assert(tx_rx);
|
|
furi_assert(dest_data);
|
|
furi_assert(src_data);
|
|
|
|
uint8_t first_block = mf_classic_get_first_block_num_of_sector(sec_num);
|
|
uint8_t total_blocks = mf_classic_get_blocks_num_in_sector(sec_num);
|
|
MfClassicSectorTrailer* sec_tr = mf_classic_get_sector_trailer_by_sector(dest_data, sec_num);
|
|
bool key_a_found = mf_classic_is_key_found(dest_data, sec_num, MfClassicKeyA);
|
|
bool key_b_found = mf_classic_is_key_found(dest_data, sec_num, MfClassicKeyB);
|
|
|
|
bool write_success = true;
|
|
for(size_t i = first_block; i < first_block + total_blocks; i++) {
|
|
// Compare blocks
|
|
if(memcmp(dest_data->block[i].value, src_data->block[i].value, MF_CLASSIC_BLOCK_SIZE) !=
|
|
0) {
|
|
if(mf_classic_is_value_block(dest_data, i)) {
|
|
bool key_a_inc_allowed = mf_classic_is_allowed_access_data_block(
|
|
dest_data, i, MfClassicKeyA, MfClassicActionDataInc);
|
|
bool key_b_inc_allowed = mf_classic_is_allowed_access_data_block(
|
|
dest_data, i, MfClassicKeyB, MfClassicActionDataInc);
|
|
bool key_a_dec_allowed = mf_classic_is_allowed_access_data_block(
|
|
dest_data, i, MfClassicKeyA, MfClassicActionDataDec);
|
|
bool key_b_dec_allowed = mf_classic_is_allowed_access_data_block(
|
|
dest_data, i, MfClassicKeyB, MfClassicActionDataDec);
|
|
|
|
int32_t src_value, dst_value;
|
|
|
|
mf_classic_block_to_value(src_data->block[i].value, &src_value, NULL);
|
|
mf_classic_block_to_value(dest_data->block[i].value, &dst_value, NULL);
|
|
|
|
int32_t diff = src_value - dst_value;
|
|
|
|
if(diff > 0) {
|
|
if(key_a_found && key_a_inc_allowed) {
|
|
FURI_LOG_I(TAG, "Incrementing block %d with key A by %ld", i, diff);
|
|
uint64_t key = nfc_util_bytes2num(sec_tr->key_a, 6);
|
|
if(!mf_classic_value_cmd_full(
|
|
tx_rx, &src_data->block[i], i, MfClassicKeyA, key, diff)) {
|
|
FURI_LOG_E(TAG, "Failed to increment block %d", i);
|
|
write_success = false;
|
|
break;
|
|
}
|
|
} else if(key_b_found && key_b_inc_allowed) {
|
|
FURI_LOG_I(TAG, "Incrementing block %d with key B by %ld", i, diff);
|
|
uint64_t key = nfc_util_bytes2num(sec_tr->key_b, 6);
|
|
if(!mf_classic_value_cmd_full(
|
|
tx_rx, &src_data->block[i], i, MfClassicKeyB, key, diff)) {
|
|
FURI_LOG_E(TAG, "Failed to increment block %d", i);
|
|
write_success = false;
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_E(TAG, "Failed to increment block %d", i);
|
|
}
|
|
} else if(diff < 0) {
|
|
if(key_a_found && key_a_dec_allowed) {
|
|
FURI_LOG_I(TAG, "Decrementing block %d with key A by %ld", i, -diff);
|
|
uint64_t key = nfc_util_bytes2num(sec_tr->key_a, 6);
|
|
if(!mf_classic_value_cmd_full(
|
|
tx_rx, &src_data->block[i], i, MfClassicKeyA, key, diff)) {
|
|
FURI_LOG_E(TAG, "Failed to decrement block %d", i);
|
|
write_success = false;
|
|
break;
|
|
}
|
|
} else if(key_b_found && key_b_dec_allowed) {
|
|
FURI_LOG_I(TAG, "Decrementing block %d with key B by %ld", i, diff);
|
|
uint64_t key = nfc_util_bytes2num(sec_tr->key_b, 6);
|
|
if(!mf_classic_value_cmd_full(
|
|
tx_rx, &src_data->block[i], i, MfClassicKeyB, key, diff)) {
|
|
FURI_LOG_E(TAG, "Failed to decrement block %d", i);
|
|
write_success = false;
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_E(TAG, "Failed to decrement block %d", i);
|
|
}
|
|
} else {
|
|
FURI_LOG_E(TAG, "Value block %d address changed, cannot write it", i);
|
|
}
|
|
} else {
|
|
bool key_a_write_allowed = mf_classic_is_allowed_access_data_block(
|
|
dest_data, i, MfClassicKeyA, MfClassicActionDataWrite);
|
|
bool key_b_write_allowed = mf_classic_is_allowed_access_data_block(
|
|
dest_data, i, MfClassicKeyB, MfClassicActionDataWrite);
|
|
|
|
if(key_a_found && key_a_write_allowed) {
|
|
FURI_LOG_I(TAG, "Writing block %d with key A", i);
|
|
uint64_t key = nfc_util_bytes2num(sec_tr->key_a, 6);
|
|
if(!mf_classic_auth_write_block(
|
|
tx_rx, &src_data->block[i], i, MfClassicKeyA, key)) {
|
|
FURI_LOG_E(TAG, "Failed to write block %d", i);
|
|
write_success = false;
|
|
break;
|
|
}
|
|
} else if(key_b_found && key_b_write_allowed) {
|
|
FURI_LOG_I(TAG, "Writing block %d with key A", i);
|
|
uint64_t key = nfc_util_bytes2num(sec_tr->key_b, 6);
|
|
if(!mf_classic_auth_write_block(
|
|
tx_rx, &src_data->block[i], i, MfClassicKeyB, key)) {
|
|
FURI_LOG_E(TAG, "Failed to write block %d", i);
|
|
write_success = false;
|
|
break;
|
|
}
|
|
} else {
|
|
FURI_LOG_E(TAG, "Failed to find key with write access");
|
|
write_success = false;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
FURI_LOG_D(TAG, "Blocks %d are equal", i);
|
|
}
|
|
}
|
|
|
|
return write_success;
|
|
}
|