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unleashed-firmware/lib/nfc_protocols/mifare_ultralight.c
Yukai Li 0d5d4c8688
RFC: NTAG I2C support (#1227) 
* nfc: Add NTAG I2C (Plus) 1K/2K read support
* nfc: Add rudimentary NTAG I2C emulation
* nfc: Closer NTAG I2C emulation plus debug logging
* nfc: Fix NTAG I2C sector select emulation
* nfc: Add security for NTAG I2C
* nfc: Send NAK correctly for MFUL reads
* nfc: Better emulate NTAG I2C SECTOR_SELECT behavior
* nfc: Fix non-I2C Ultralight read
  Per datasheet, max sector for SECTOR_SELECT is 0xfe, so 0xff is OK
  as uninit value
* nfc: Only read sig for NTAG if supported
  Attempting to read signature breaks immediate call to sector select on
  NTAG I2C original for some reason, so don't read signature if the
  command is not supported

Co-authored-by: gornekich <n.gorbadey@gmail.com>
2022-05-26 15:55:29 +03:00

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#include <limits.h>
#include "mifare_ultralight.h"
#include <furi.h>
#include <m-string.h>
#define TAG "MfUltralight"
bool mf_ul_check_card_type(uint8_t ATQA0, uint8_t ATQA1, uint8_t SAK) {
if((ATQA0 == 0x44) && (ATQA1 == 0x00) && (SAK == 0x00)) {
return true;
}
return false;
}
static void mf_ul_set_default_version(MfUltralightReader* reader, MfUltralightData* data) {
data->type = MfUltralightTypeUnknown;
reader->pages_to_read = 16;
reader->support_fast_read = false;
reader->support_tearing_flags = false;
reader->support_counters = false;
reader->support_signature = false;
}
bool mf_ultralight_read_version(
FuriHalNfcTxRxContext* tx_rx,
MfUltralightReader* reader,
MfUltralightData* data) {
bool version_read = false;
do {
FURI_LOG_D(TAG, "Reading version");
tx_rx->tx_data[0] = MF_UL_GET_VERSION_CMD;
tx_rx->tx_bits = 8;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(!furi_hal_nfc_tx_rx(tx_rx, 50)) {
FURI_LOG_D(TAG, "Failed reading version");
mf_ul_set_default_version(reader, data);
furi_hal_nfc_sleep();
furi_hal_nfc_activate_nfca(300, NULL);
break;
}
MfUltralightVersion* version = (MfUltralightVersion*)tx_rx->rx_data;
data->version = *version;
if(version->storage_size == 0x0B || version->storage_size == 0x00) {
data->type = MfUltralightTypeUL11;
reader->pages_to_read = 20;
reader->support_fast_read = true;
reader->support_tearing_flags = true;
reader->support_counters = true;
reader->support_signature = true;
} else if(version->storage_size == 0x0E) {
data->type = MfUltralightTypeUL21;
reader->pages_to_read = 41;
reader->support_fast_read = true;
reader->support_tearing_flags = true;
reader->support_counters = true;
reader->support_signature = true;
} else if(version->storage_size == 0x0F) {
data->type = MfUltralightTypeNTAG213;
reader->pages_to_read = 45;
reader->support_fast_read = true;
reader->support_tearing_flags = false;
reader->support_counters = false;
reader->support_signature = true;
} else if(version->storage_size == 0x11) {
data->type = MfUltralightTypeNTAG215;
reader->pages_to_read = 135;
reader->support_fast_read = true;
reader->support_tearing_flags = false;
reader->support_counters = false;
reader->support_signature = true;
} else if(version->prod_subtype == 5 && version->prod_ver_major == 2) {
// NTAG I2C
bool known = false;
if(version->prod_ver_minor == 1) {
if(version->storage_size == 0x13) {
data->type = MfUltralightTypeNTAGI2C1K;
reader->pages_to_read = 231;
reader->support_signature = false;
known = true;
} else if(version->storage_size == 0x15) {
data->type = MfUltralightTypeNTAGI2C2K;
reader->pages_to_read = 485;
reader->support_signature = false;
known = true;
}
} else if(version->prod_ver_minor == 2) {
if(version->storage_size == 0x13) {
data->type = MfUltralightTypeNTAGI2CPlus1K;
reader->pages_to_read = 236;
reader->support_signature = true;
known = true;
} else if(version->storage_size == 0x15) {
data->type = MfUltralightTypeNTAGI2CPlus2K;
reader->pages_to_read = 492;
reader->support_signature = true;
known = true;
}
}
if(known) {
reader->support_fast_read = true;
reader->support_tearing_flags = false;
reader->support_counters = false;
} else {
mf_ul_set_default_version(reader, data);
}
} else if(version->storage_size == 0x13) {
data->type = MfUltralightTypeNTAG216;
reader->pages_to_read = 231;
reader->support_fast_read = true;
reader->support_tearing_flags = false;
reader->support_counters = false;
reader->support_signature = true;
} else {
mf_ul_set_default_version(reader, data);
break;
}
version_read = true;
} while(false);
return version_read;
}
static int16_t mf_ultralight_ntag_i2c_addr_lin_to_tag_1k(
int16_t linear_address,
uint8_t* sector,
int16_t* valid_pages) {
// 0 - 226: sector 0
// 227 - 228: config registers
// 229 - 230: session registers
if(linear_address > 230) {
*valid_pages = 0;
return -1;
} else if(linear_address >= 229) {
*sector = 3;
*valid_pages = 2 - (linear_address - 229);
return linear_address - 229 + 248;
} else if(linear_address >= 227) {
*sector = 0;
*valid_pages = 2 - (linear_address - 227);
return linear_address - 227 + 232;
} else {
*sector = 0;
*valid_pages = 227 - linear_address;
return linear_address;
}
}
static int16_t mf_ultralight_ntag_i2c_addr_lin_to_tag_2k(
int16_t linear_address,
uint8_t* sector,
int16_t* valid_pages) {
// 0 - 255: sector 0
// 256 - 480: sector 1
// 481 - 482: config registers
// 483 - 484: session registers
if(linear_address > 484) {
*valid_pages = 0;
return -1;
} else if(linear_address >= 483) {
*sector = 3;
*valid_pages = 2 - (linear_address - 483);
return linear_address - 483 + 248;
} else if(linear_address >= 481) {
*sector = 1;
*valid_pages = 2 - (linear_address - 481);
return linear_address - 481 + 232;
} else if(linear_address >= 256) {
*sector = 1;
*valid_pages = 225 - (linear_address - 256);
return linear_address - 256;
} else {
*sector = 0;
*valid_pages = 256 - linear_address;
return linear_address;
}
}
static int16_t mf_ultralight_ntag_i2c_addr_lin_to_tag_plus_1k(
int16_t linear_address,
uint8_t* sector,
int16_t* valid_pages) {
// 0 - 233: sector 0 + registers
// 234 - 235: session registers
if(linear_address > 235) {
*valid_pages = 0;
return -1;
} else if(linear_address >= 234) {
*sector = 0;
*valid_pages = 2 - (linear_address - 234);
return linear_address - 234 + 236;
} else {
*sector = 0;
*valid_pages = 234 - linear_address;
return linear_address;
}
}
static int16_t mf_ultralight_ntag_i2c_addr_lin_to_tag_plus_2k(
int16_t linear_address,
uint8_t* sector,
int16_t* valid_pages) {
// 0 - 233: sector 0 + registers
// 234 - 235: session registers
// 236 - 491: sector 1
if(linear_address > 491) {
*valid_pages = 0;
return -1;
} else if(linear_address >= 236) {
*sector = 1;
*valid_pages = 256 - (linear_address - 236);
return linear_address - 236;
} else if(linear_address >= 234) {
*sector = 0;
*valid_pages = 2 - (linear_address - 234);
return linear_address - 234 + 236;
} else {
*sector = 0;
*valid_pages = 234 - linear_address;
return linear_address;
}
}
static int16_t mf_ultralight_ntag_i2c_addr_lin_to_tag(
MfUltralightData* data,
MfUltralightReader* reader,
int16_t linear_address,
uint8_t* sector,
int16_t* valid_pages) {
switch(data->type) {
case MfUltralightTypeNTAGI2C1K:
return mf_ultralight_ntag_i2c_addr_lin_to_tag_1k(linear_address, sector, valid_pages);
case MfUltralightTypeNTAGI2C2K:
return mf_ultralight_ntag_i2c_addr_lin_to_tag_2k(linear_address, sector, valid_pages);
case MfUltralightTypeNTAGI2CPlus1K:
return mf_ultralight_ntag_i2c_addr_lin_to_tag_plus_1k(linear_address, sector, valid_pages);
case MfUltralightTypeNTAGI2CPlus2K:
return mf_ultralight_ntag_i2c_addr_lin_to_tag_plus_2k(linear_address, sector, valid_pages);
default:
*sector = 0xff;
*valid_pages = reader->pages_to_read - linear_address;
return linear_address;
}
}
static int16_t
mf_ultralight_ntag_i2c_addr_tag_to_lin_1k(uint8_t page, uint8_t sector, uint16_t* valid_pages) {
bool valid = false;
int16_t translated_page;
if(sector == 0) {
if(page <= 226) {
*valid_pages = 227 - page;
translated_page = page;
valid = true;
} else if(page >= 232 && page <= 233) {
*valid_pages = 2 - (page - 232);
translated_page = page - 232 + 227;
valid = true;
}
} else if(sector == 3) {
if(page >= 248 && page <= 249) {
*valid_pages = 2 - (page - 248);
translated_page = page - 248 + 229;
valid = true;
}
}
if(!valid) {
*valid_pages = 0;
translated_page = -1;
}
return translated_page;
}
static int16_t
mf_ultralight_ntag_i2c_addr_tag_to_lin_2k(uint8_t page, uint8_t sector, uint16_t* valid_pages) {
bool valid = false;
int16_t translated_page;
if(sector == 0) {
*valid_pages = 256 - page;
translated_page = page;
valid = true;
} else if(sector == 1) {
if(page <= 224) {
*valid_pages = 225 - page;
translated_page = 256 + page;
valid = true;
} else if(page >= 232 && page <= 233) {
*valid_pages = 2 - (page - 232);
translated_page = page - 232 + 481;
valid = true;
}
} else if(sector == 3) {
if(page >= 248 && page <= 249) {
*valid_pages = 2 - (page - 248);
translated_page = page - 248 + 483;
valid = true;
}
}
if(!valid) {
*valid_pages = 0;
translated_page = -1;
}
return translated_page;
}
static int16_t mf_ultralight_ntag_i2c_addr_tag_to_lin_plus_1k(
uint8_t page,
uint8_t sector,
uint16_t* valid_pages) {
bool valid = false;
int16_t translated_page;
if(sector == 0) {
if(page <= 233) {
*valid_pages = 234 - page;
translated_page = page;
valid = true;
} else if(page >= 236 && page <= 237) {
*valid_pages = 2 - (page - 236);
translated_page = page - 236 + 234;
valid = true;
}
} else if(sector == 3) {
if(page >= 248 && page <= 249) {
*valid_pages = 2 - (page - 248);
translated_page = page - 248 + 234;
valid = true;
}
}
if(!valid) {
*valid_pages = 0;
translated_page = -1;
}
return translated_page;
}
static int16_t mf_ultralight_ntag_i2c_addr_tag_to_lin_plus_2k(
uint8_t page,
uint8_t sector,
uint16_t* valid_pages) {
bool valid = false;
int16_t translated_page;
if(sector == 0) {
if(page <= 233) {
*valid_pages = 234 - page;
translated_page = page;
valid = true;
} else if(page >= 236 && page <= 237) {
*valid_pages = 2 - (page - 236);
translated_page = page - 236 + 234;
valid = true;
}
} else if(sector == 1) {
*valid_pages = 256 - page;
translated_page = page + 236;
valid = true;
} else if(sector == 3) {
if(page >= 248 && page <= 249) {
*valid_pages = 2 - (page - 248);
translated_page = page - 248 + 234;
valid = true;
}
}
if(!valid) {
*valid_pages = 0;
translated_page = -1;
}
return translated_page;
}
static int16_t mf_ultralight_ntag_i2c_addr_tag_to_lin(
MfUltralightData* data,
uint8_t page,
uint8_t sector,
uint16_t* valid_pages) {
switch(data->type) {
case MfUltralightTypeNTAGI2C1K:
return mf_ultralight_ntag_i2c_addr_tag_to_lin_1k(page, sector, valid_pages);
case MfUltralightTypeNTAGI2C2K:
return mf_ultralight_ntag_i2c_addr_tag_to_lin_2k(page, sector, valid_pages);
case MfUltralightTypeNTAGI2CPlus1K:
return mf_ultralight_ntag_i2c_addr_tag_to_lin_plus_1k(page, sector, valid_pages);
case MfUltralightTypeNTAGI2CPlus2K:
return mf_ultralight_ntag_i2c_addr_tag_to_lin_plus_2k(page, sector, valid_pages);
default:
*valid_pages = data->data_size / 4 - page;
return page;
}
}
static bool mf_ultralight_sector_select(FuriHalNfcTxRxContext* tx_rx, uint8_t sector) {
FURI_LOG_D(TAG, "Selecting sector %u", sector);
tx_rx->tx_data[0] = MF_UL_SECTOR_SELECT;
tx_rx->tx_data[1] = 0xff;
tx_rx->tx_bits = 16;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(!furi_hal_nfc_tx_rx(tx_rx, 50)) {
FURI_LOG_D(TAG, "Failed to issue sector select command");
return false;
}
tx_rx->tx_data[0] = sector;
tx_rx->tx_data[1] = 0x00;
tx_rx->tx_data[2] = 0x00;
tx_rx->tx_data[3] = 0x00;
tx_rx->tx_bits = 32;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
// This is NOT a typo! The tag ACKs by not sending a response within 1ms.
if(furi_hal_nfc_tx_rx(tx_rx, 20)) {
// TODO: what gets returned when an actual NAK is received?
FURI_LOG_D(TAG, "Sector %u select NAK'd", sector);
return false;
}
return true;
}
bool mf_ultralight_read_pages(
FuriHalNfcTxRxContext* tx_rx,
MfUltralightReader* reader,
MfUltralightData* data) {
uint8_t pages_read_cnt = 0;
uint8_t curr_sector_index = 0xff;
reader->pages_read = 0;
for(size_t i = 0; i < reader->pages_to_read; i += pages_read_cnt) {
uint8_t tag_sector;
int16_t valid_pages;
int16_t tag_page = mf_ultralight_ntag_i2c_addr_lin_to_tag(
data, reader, (int16_t)i, &tag_sector, &valid_pages);
furi_assert(tag_page != -1);
if(curr_sector_index != tag_sector) {
if(!mf_ultralight_sector_select(tx_rx, tag_sector)) return false;
curr_sector_index = tag_sector;
}
FURI_LOG_D(TAG, "Reading pages %d - %d", i, i + (valid_pages > 4 ? 4 : valid_pages) - 1);
tx_rx->tx_data[0] = MF_UL_READ_CMD;
tx_rx->tx_data[1] = tag_page;
tx_rx->tx_bits = 16;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(!furi_hal_nfc_tx_rx(tx_rx, 50)) {
FURI_LOG_D(
TAG,
"Failed to read pages %d - %d",
i,
i + (valid_pages > 4 ? 4 : valid_pages) - 1);
break;
}
if(valid_pages > 4) {
pages_read_cnt = 4;
} else {
pages_read_cnt = valid_pages;
}
reader->pages_read += pages_read_cnt;
data->data_size = reader->pages_read * 4;
memcpy(&data->data[i * 4], tx_rx->rx_data, pages_read_cnt * 4);
}
return reader->pages_read == reader->pages_to_read;
}
bool mf_ultralight_fast_read_pages(
FuriHalNfcTxRxContext* tx_rx,
MfUltralightReader* reader,
MfUltralightData* data) {
uint8_t curr_sector_index = 0xff;
reader->pages_read = 0;
while(reader->pages_read < reader->pages_to_read) {
uint8_t tag_sector;
int16_t valid_pages;
int16_t tag_page = mf_ultralight_ntag_i2c_addr_lin_to_tag(
data, reader, reader->pages_read, &tag_sector, &valid_pages);
furi_assert(tag_page != -1);
if(curr_sector_index != tag_sector) {
if(!mf_ultralight_sector_select(tx_rx, tag_sector)) return false;
curr_sector_index = tag_sector;
}
FURI_LOG_D(
TAG, "Reading pages %d - %d", reader->pages_read, reader->pages_read + valid_pages - 1);
tx_rx->tx_data[0] = MF_UL_FAST_READ_CMD;
tx_rx->tx_data[1] = tag_page;
tx_rx->tx_data[2] = valid_pages - 1;
tx_rx->tx_bits = 24;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
memcpy(&data->data[reader->pages_read * 4], tx_rx->rx_data, valid_pages * 4);
reader->pages_read += valid_pages;
data->data_size = reader->pages_read * 4;
} else {
FURI_LOG_D(
TAG,
"Failed to read pages %d - %d",
reader->pages_read,
reader->pages_read + valid_pages - 1);
break;
}
}
return reader->pages_read == reader->pages_to_read;
}
bool mf_ultralight_read_signature(FuriHalNfcTxRxContext* tx_rx, MfUltralightData* data) {
bool signature_read = false;
FURI_LOG_D(TAG, "Reading signature");
tx_rx->tx_data[0] = MF_UL_READ_SIG;
tx_rx->tx_data[1] = 0;
tx_rx->tx_bits = 16;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(furi_hal_nfc_tx_rx(tx_rx, 50)) {
memcpy(data->signature, tx_rx->rx_data, sizeof(data->signature));
signature_read = true;
} else {
FURI_LOG_D(TAG, "Failed redaing signature");
}
return signature_read;
}
bool mf_ultralight_read_counters(FuriHalNfcTxRxContext* tx_rx, MfUltralightData* data) {
uint8_t counter_read = 0;
FURI_LOG_D(TAG, "Reading counters");
for(size_t i = 0; i < 3; i++) {
tx_rx->tx_data[0] = MF_UL_READ_CNT;
tx_rx->rx_data[1] = i;
tx_rx->tx_bits = 16;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(!furi_hal_nfc_tx_rx(tx_rx, 50)) {
FURI_LOG_D(TAG, "Failed to read %d counter", i);
break;
}
data->counter[i] = (tx_rx->rx_data[2] << 16) | (tx_rx->rx_data[1] << 8) |
tx_rx->rx_data[0];
counter_read++;
}
return counter_read == 2;
}
bool mf_ultralight_read_tearing_flags(FuriHalNfcTxRxContext* tx_rx, MfUltralightData* data) {
uint8_t flag_read = 0;
FURI_LOG_D(TAG, "Reading tearing flags");
for(size_t i = 0; i < 3; i++) {
tx_rx->tx_data[0] = MF_UL_CHECK_TEARING;
tx_rx->rx_data[1] = i;
tx_rx->tx_bits = 16;
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
if(!furi_hal_nfc_tx_rx(tx_rx, 50)) {
FURI_LOG_D(TAG, "Failed to read %d tearing flag", i);
break;
}
data->tearing[i] = tx_rx->rx_data[0];
flag_read++;
}
return flag_read == 2;
}
bool mf_ul_read_card(
FuriHalNfcTxRxContext* tx_rx,
MfUltralightReader* reader,
MfUltralightData* data) {
furi_assert(tx_rx);
furi_assert(reader);
furi_assert(data);
bool card_read = false;
// Read Mifare Ultralight version
if(mf_ultralight_read_version(tx_rx, reader, data)) {
if(reader->support_signature) {
// Read Signature
mf_ultralight_read_signature(tx_rx, data);
}
}
if(reader->support_counters) {
mf_ultralight_read_counters(tx_rx, data);
}
if(reader->support_tearing_flags) {
mf_ultralight_read_tearing_flags(tx_rx, data);
}
card_read = mf_ultralight_read_pages(tx_rx, reader, data);
return card_read;
}
// TODO rework
static void mf_ul_protect_auth_data_on_read_command(
uint8_t* tx_buff,
uint8_t start_page,
uint8_t end_page,
MfUltralightEmulator* emulator) {
if(emulator->data.type >= MfUltralightTypeNTAG213) {
uint8_t pwd_page = (emulator->data.data_size / 4) - 2;
uint8_t pack_page = pwd_page + 1;
if((start_page <= pwd_page) && (end_page >= pwd_page)) {
memset(&tx_buff[(pwd_page - start_page) * 4], 0, 4);
}
if((start_page <= pack_page) && (end_page >= pack_page)) {
memset(&tx_buff[(pack_page - start_page) * 4], 0, 2);
}
}
}
static void mf_ul_protect_auth_data_on_read_command_i2c(
uint8_t* tx_buff,
uint8_t start_page,
uint8_t end_page,
MfUltralightEmulator* emulator) {
if(emulator->data.type >= MfUltralightTypeNTAGI2CPlus1K) {
// Blank out PWD and PACK
if(start_page <= 229 && end_page >= 229) {
uint16_t offset = (229 - start_page) * 4;
uint8_t count = 4;
if(end_page >= 230) count += 2;
memset(&tx_buff[offset], 0, count);
}
// Handle AUTH0 for sector 0
if(!emulator->auth_success) {
uint8_t access = emulator->data.data[228 * 4];
if(access & 0x80) {
uint8_t auth0 = emulator->data.data[227 * 4 + 3];
if(auth0 < end_page) {
// start_page is always < auth0; otherwise is NAK'd already
uint8_t page_offset = auth0 - start_page;
uint8_t page_count = end_page - auth0;
memset(&tx_buff[page_offset * 4], 0, page_count * 4);
}
}
}
}
}
static void mf_ul_ntag_i2c_fill_cross_area_read(
uint8_t* tx_buff,
uint8_t start_page,
uint8_t end_page,
MfUltralightEmulator* emulator) {
// For copying config or session registers in fast read
int16_t tx_page_offset;
int16_t data_page_offset;
uint8_t page_length;
bool apply = false;
MfUltralightType type = emulator->data.type;
if(emulator->curr_sector == 0) {
if(type == MfUltralightTypeNTAGI2C1K) {
if(start_page <= 233 && end_page >= 232) {
tx_page_offset = start_page - 232;
data_page_offset = 227;
page_length = 2;
apply = true;
}
} else if(type == MfUltralightTypeNTAGI2CPlus1K || type == MfUltralightTypeNTAGI2CPlus2K) {
if(start_page <= 237 && end_page >= 236) {
tx_page_offset = start_page - 236;
data_page_offset = 234;
page_length = 2;
apply = true;
}
}
} else if(emulator->curr_sector == 1) {
if(type == MfUltralightTypeNTAGI2C2K) {
if(start_page <= 233 && end_page >= 232) {
tx_page_offset = start_page - 232;
data_page_offset = 483;
page_length = 2;
apply = true;
}
}
}
if(apply) {
while(tx_page_offset < 0 && page_length > 0) {
++tx_page_offset;
++data_page_offset;
--page_length;
}
memcpy(
&tx_buff[tx_page_offset * 4],
&emulator->data.data[data_page_offset * 4],
page_length * 4);
}
}
static bool mf_ul_ntag_i2c_plus_check_auth(
MfUltralightEmulator* emulator,
uint8_t start_page,
bool is_write) {
if(!emulator->auth_success) {
uint8_t access = emulator->data.data[228 * 4];
// Check NFC_PROT
if(emulator->curr_sector == 0 && ((access & 0x80) || is_write)) {
uint8_t auth0 = emulator->data.data[227 * 4 + 3];
if(start_page >= auth0) return false;
} else if(emulator->curr_sector == 1) {
// We don't have to specifically check for type because this is done
// by address translator
uint8_t pt_i2c = emulator->data.data[231 * 4];
// Check 2K_PROT
if(pt_i2c & 0x08) return false;
}
}
if(emulator->curr_sector == 1) {
// Check NFC_DIS_SEC1
uint8_t access = emulator->data.data[228 * 4];
if(access & 0x20) return false;
}
return true;
}
void mf_ul_prepare_emulation(MfUltralightEmulator* emulator, MfUltralightData* data) {
FURI_LOG_D(TAG, "Prepare emulation");
emulator->data = *data;
emulator->auth_data = NULL;
emulator->data_changed = false;
emulator->comp_write_cmd_started = false;
emulator->sector_select_cmd_started = false;
emulator->ntag_i2c_plus_sector3_lockout = false;
if(data->type == MfUltralightTypeUnknown) {
emulator->support_fast_read = false;
} else if(data->type == MfUltralightTypeUL11) {
emulator->support_fast_read = true;
} else if(data->type == MfUltralightTypeUL21) {
emulator->support_fast_read = true;
} else if(data->type == MfUltralightTypeNTAG213) {
emulator->support_fast_read = true;
} else if(data->type == MfUltralightTypeNTAG215) {
emulator->support_fast_read = true;
} else if(data->type == MfUltralightTypeNTAG216) {
emulator->support_fast_read = true;
} else if(data->type >= MfUltralightTypeNTAGI2C1K) {
emulator->support_fast_read = true;
}
if(data->type >= MfUltralightTypeNTAG213 && data->type < MfUltralightTypeNTAGI2C1K) {
uint16_t pwd_page = (data->data_size / 4) - 2;
emulator->auth_data = (MfUltralightAuth*)&data->data[pwd_page * 4];
} else if(data->type >= MfUltralightTypeNTAGI2CPlus1K) {
emulator->auth_data = (MfUltralightAuth*)&data->data[229 * 4];
}
}
bool mf_ul_prepare_emulation_response(
uint8_t* buff_rx,
uint16_t buff_rx_len,
uint8_t* buff_tx,
uint16_t* buff_tx_len,
uint32_t* data_type,
void* context) {
furi_assert(context);
MfUltralightEmulator* emulator = context;
uint8_t cmd = buff_rx[0];
uint16_t page_num = emulator->data.data_size / 4;
uint16_t tx_bytes = 0;
uint16_t tx_bits = 0;
bool command_parsed = false;
bool send_ack = false;
bool respond_nothing = false;
#ifdef FURI_DEBUG
string_t debug_buf;
string_init(debug_buf);
for(int i = 0; i < (buff_rx_len + 7) / 8; ++i) {
string_cat_printf(debug_buf, "%02x ", buff_rx[i]);
}
string_strim(debug_buf);
FURI_LOG_T(TAG, "Emu RX (%d): %s", buff_rx_len, string_get_cstr(debug_buf));
string_reset(debug_buf);
#endif
// Check composite commands
if(emulator->comp_write_cmd_started) {
// Compatibility write is the only one composit command
if(buff_rx_len == 16) {
memcpy(&emulator->data.data[emulator->comp_write_page_addr * 4], buff_rx, 4);
emulator->data_changed = true;
// Send ACK message
buff_tx[0] = 0x0A;
tx_bits = 4;
*data_type = FURI_HAL_NFC_TXRX_RAW;
command_parsed = true;
}
emulator->comp_write_cmd_started = false;
} else if(emulator->sector_select_cmd_started) {
if(buff_rx[0] <= 0xFE) {
emulator->curr_sector = buff_rx[0] > 3 ? 0 : buff_rx[0];
emulator->ntag_i2c_plus_sector3_lockout = false;
command_parsed = true;
respond_nothing = true;
FURI_LOG_D(TAG, "Changing sector to %d", emulator->curr_sector);
}
emulator->sector_select_cmd_started = false;
} else if(cmd == MF_UL_GET_VERSION_CMD) {
if(emulator->data.type != MfUltralightTypeUnknown) {
tx_bytes = sizeof(emulator->data.version);
memcpy(buff_tx, &emulator->data.version, tx_bytes);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
} else if(cmd == MF_UL_READ_CMD) {
int16_t start_page = buff_rx[1];
tx_bytes = 16;
if(emulator->data.type < MfUltralightTypeNTAGI2C1K) {
if(start_page < page_num) {
if(start_page + 4 > page_num) {
// Handle roll-over mechanism
uint8_t end_pages_num = page_num - start_page;
memcpy(buff_tx, &emulator->data.data[start_page * 4], end_pages_num * 4);
memcpy(
&buff_tx[end_pages_num * 4], emulator->data.data, (4 - end_pages_num) * 4);
} else {
memcpy(buff_tx, &emulator->data.data[start_page * 4], tx_bytes);
}
mf_ul_protect_auth_data_on_read_command(
buff_tx, start_page, (start_page + 4), emulator);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
} else {
uint16_t valid_pages;
start_page = mf_ultralight_ntag_i2c_addr_tag_to_lin(
&emulator->data, start_page, emulator->curr_sector, &valid_pages);
if(start_page != -1) {
if(emulator->data.type < MfUltralightTypeNTAGI2CPlus1K ||
mf_ul_ntag_i2c_plus_check_auth(emulator, buff_rx[1], false)) {
if(emulator->data.type >= MfUltralightTypeNTAGI2CPlus1K &&
emulator->curr_sector == 3 && valid_pages == 1) {
// Rewind back a sector to match behavior on a real tag
--start_page;
++valid_pages;
}
uint16_t copy_count = (valid_pages > 4 ? 4 : valid_pages) * 4;
FURI_LOG_D(
TAG,
"NTAG I2C Emu: page valid, %02x:%02x -> %d, %d",
emulator->curr_sector,
buff_rx[1],
start_page,
valid_pages);
memcpy(buff_tx, &emulator->data.data[start_page * 4], copy_count);
// For NTAG I2C, there's no roll-over; remainder is filled by null bytes
if(copy_count < tx_bytes)
memset(&buff_tx[copy_count], 0, tx_bytes - copy_count);
// Special case: NTAG I2C Plus sector 0 page 233 read crosses into page 236
if(start_page == 233)
memcpy(&buff_tx[12], &emulator->data.data[(start_page + 1) * 4], 4);
mf_ul_protect_auth_data_on_read_command_i2c(
buff_tx, start_page, start_page + copy_count / 4 - 1, emulator);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
} else {
FURI_LOG_D(
TAG,
"NTAG I2C Emu: page invalid, %02x:%02x",
emulator->curr_sector,
buff_rx[1]);
if(emulator->data.type >= MfUltralightTypeNTAGI2CPlus1K &&
emulator->curr_sector == 3 && !emulator->ntag_i2c_plus_sector3_lockout) {
// NTAG I2C Plus has a weird behavior where if you read sector 3
// at an invalid address, it responds with zeroes then locks
// the read out, while if you read the mirrored session registers,
// it returns both session registers on either pages
memset(buff_tx, 0, tx_bytes);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
emulator->ntag_i2c_plus_sector3_lockout = true;
}
}
}
if(!command_parsed) tx_bytes = 0;
} else if(cmd == MF_UL_FAST_READ_CMD) {
if(emulator->support_fast_read) {
int16_t start_page = buff_rx[1];
uint8_t end_page = buff_rx[2];
if(start_page <= end_page) {
tx_bytes = ((end_page + 1) - start_page) * 4;
if(emulator->data.type < MfUltralightTypeNTAGI2C1K) {
if((start_page < page_num) && (end_page < page_num)) {
memcpy(buff_tx, &emulator->data.data[start_page * 4], tx_bytes);
mf_ul_protect_auth_data_on_read_command(
buff_tx, start_page, end_page, emulator);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
} else {
uint16_t valid_pages;
start_page = mf_ultralight_ntag_i2c_addr_tag_to_lin(
&emulator->data, start_page, emulator->curr_sector, &valid_pages);
if(start_page != -1) {
if(emulator->data.type < MfUltralightTypeNTAGI2CPlus1K ||
mf_ul_ntag_i2c_plus_check_auth(emulator, buff_rx[1], false)) {
uint16_t copy_count = (valid_pages > 4 ? 4 : valid_pages) * 4;
memcpy(buff_tx, &emulator->data.data[start_page * 4], copy_count);
if(copy_count < tx_bytes)
memset(&buff_tx[copy_count], 0, tx_bytes - copy_count);
mf_ul_ntag_i2c_fill_cross_area_read(
buff_tx, buff_rx[1], buff_rx[2], emulator);
mf_ul_protect_auth_data_on_read_command_i2c(
buff_tx, start_page, start_page + copy_count / 4 - 1, emulator);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
}
}
if(!command_parsed) tx_bytes = 0;
}
}
} else if(cmd == MF_UL_WRITE) {
int16_t write_page = buff_rx[1];
if(write_page > 1) {
uint16_t valid_pages;
write_page = mf_ultralight_ntag_i2c_addr_tag_to_lin(
&emulator->data, write_page, emulator->curr_sector, &valid_pages);
if(write_page != -1 &&
(emulator->data.type >= MfUltralightTypeNTAGI2C1K || (write_page < page_num - 2))) {
if(emulator->data.type < MfUltralightTypeNTAGI2CPlus1K ||
mf_ul_ntag_i2c_plus_check_auth(emulator, buff_rx[1], true)) {
memcpy(&emulator->data.data[write_page * 4], &buff_rx[2], 4);
emulator->data_changed = true;
send_ack = true;
command_parsed = true;
}
}
}
} else if(cmd == MF_UL_FAST_WRITE) {
if(emulator->data.type >= MfUltralightTypeNTAGI2CPlus1K) {
if(buff_rx[1] == 0xF0 && buff_rx[2] == 0xFF) {
// TODO: update when SRAM emulation implemented
send_ack = true;
command_parsed = true;
}
}
} else if(cmd == MF_UL_COMP_WRITE) {
if(emulator->data.type < MfUltralightTypeNTAGI2C1K) {
uint8_t write_page = buff_rx[1];
if((write_page > 1) && (write_page < page_num - 2)) {
emulator->comp_write_cmd_started = true;
emulator->comp_write_page_addr = write_page;
// ACK
buff_tx[0] = 0x0A;
tx_bits = 4;
*data_type = FURI_HAL_NFC_TXRX_RAW;
command_parsed = true;
}
}
} else if(cmd == MF_UL_READ_CNT) {
if(emulator->data.type < MfUltralightTypeNTAGI2C1K) {
uint8_t cnt_num = buff_rx[1];
if(cnt_num < 3) {
buff_tx[0] = emulator->data.counter[cnt_num] >> 16;
buff_tx[1] = emulator->data.counter[cnt_num] >> 8;
buff_tx[2] = emulator->data.counter[cnt_num];
tx_bytes = 3;
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
}
} else if(cmd == MF_UL_INC_CNT) {
if(emulator->data.type < MfUltralightTypeNTAGI2C1K) {
uint8_t cnt_num = buff_rx[1];
uint32_t inc = (buff_rx[2] | (buff_rx[3] << 8) | (buff_rx[4] << 16));
if((cnt_num < 3) && (emulator->data.counter[cnt_num] + inc < 0x00FFFFFF)) {
emulator->data.counter[cnt_num] += inc;
emulator->data_changed = true;
// ACK
buff_tx[0] = 0x0A;
tx_bits = 4;
*data_type = FURI_HAL_NFC_TXRX_RAW;
command_parsed = true;
}
}
} else if(cmd == MF_UL_AUTH) {
if(emulator->data.type >= MfUltralightTypeNTAG213 &&
emulator->data.type != MfUltralightTypeNTAGI2C1K &&
emulator->data.type != MfUltralightTypeNTAGI2C2K) {
if(memcmp(&buff_rx[1], emulator->auth_data->pwd, 4) == 0) {
buff_tx[0] = emulator->auth_data->pack.raw[0];
buff_tx[1] = emulator->auth_data->pack.raw[1];
tx_bytes = 2;
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
emulator->auth_success = true;
command_parsed = true;
} else if(!emulator->auth_data->pack.value) {
buff_tx[0] = 0x80;
buff_tx[1] = 0x80;
tx_bytes = 2;
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
}
} else if(cmd == MF_UL_READ_SIG) {
if(emulator->data.type != MfUltralightTypeNTAGI2C1K &&
emulator->data.type != MfUltralightTypeNTAGI2C2K) {
// Check 2nd byte = 0x00 - RFU
if(buff_rx[1] == 0x00) {
tx_bytes = sizeof(emulator->data.signature);
memcpy(buff_tx, emulator->data.signature, tx_bytes);
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
}
} else if(cmd == MF_UL_CHECK_TEARING) {
if(emulator->data.type < MfUltralightTypeNTAGI2C1K) {
uint8_t cnt_num = buff_rx[1];
if(cnt_num < 3) {
buff_tx[0] = emulator->data.tearing[cnt_num];
tx_bytes = 1;
*data_type = FURI_HAL_NFC_TXRX_DEFAULT;
command_parsed = true;
}
}
} else if(cmd == MF_UL_HALT_START) {
tx_bits = 0;
emulator->curr_sector = 0;
emulator->ntag_i2c_plus_sector3_lockout = false;
emulator->auth_success = false;
command_parsed = true;
FURI_LOG_D(TAG, "Received HLTA");
} else if(cmd == MF_UL_SECTOR_SELECT) {
if(emulator->data.type >= MfUltralightTypeNTAGI2C1K) {
if(buff_rx[1] == 0xFF) {
// Send ACK
emulator->sector_select_cmd_started = true;
send_ack = true;
command_parsed = true;
}
}
}
if(!command_parsed) {
// Send NACK
buff_tx[0] = 0x00;
tx_bits = 4;
*data_type = FURI_HAL_NFC_TX_RAW_RX_DEFAULT;
} else if(send_ack) {
buff_tx[0] = 0x0A;
tx_bits = 4;
*data_type = FURI_HAL_NFC_TX_RAW_RX_DEFAULT;
}
if(respond_nothing) {
*buff_tx_len = UINT16_MAX;
*data_type = FURI_HAL_NFC_TX_RAW_RX_DEFAULT;
} else {
// Return tx buffer size in bits
if(tx_bytes) {
tx_bits = tx_bytes * 8;
}
*buff_tx_len = tx_bits;
}
#ifdef FURI_DEBUG
if(*buff_tx_len == UINT16_MAX) {
FURI_LOG_T(TAG, "Emu TX: no reply");
} else if(*buff_tx_len > 0) {
int count = (*buff_tx_len + 7) / 8;
for(int i = 0; i < count; ++i) {
string_cat_printf(debug_buf, "%02x ", buff_tx[i]);
}
string_strim(debug_buf);
FURI_LOG_T(TAG, "Emu TX (%d): %s", *buff_tx_len, string_get_cstr(debug_buf));
string_clear(debug_buf);
} else {
FURI_LOG_T(TAG, "Emu TX: HALT");
}
#endif
return tx_bits > 0;
}
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