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unleashed-firmware/lib/nfc_protocols/mifare_desfire.c
Kevin Wallace 4b45746b8e
Fix MiFare DESFire GetKeySettings response parsing (#1267) 
Only the bottom nybble of buf[1] is the key ID; the top nybble contains flags.
Notably, the top bit is set for AES mode on EV1+ cards, and ORCA cards in the
Seattle area were just upgraded to include an app that uses AES.

Prior to this, cards with flags set could be read and saved just fine, but
loading them would fail due to missing keys.  After this, tags saved with the
old version will load fine, and when re-saved will have the flags separated
out into a new field.

Co-authored-by: Kevin Wallace <git+flipperzero@kevin.wallace.seattle.wa.us>
Co-authored-by: gornekich <n.gorbadey@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>
2022-05-24 17:05:46 +03:00

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#include "mifare_desfire.h"
#include <furi.h>
#include <furi_hal_nfc.h>
void mf_df_clear(MifareDesfireData* data) {
free(data->free_memory);
if(data->master_key_settings) {
MifareDesfireKeyVersion* key_version = data->master_key_settings->key_version_head;
while(key_version) {
MifareDesfireKeyVersion* next_key_version = key_version->next;
free(key_version);
key_version = next_key_version;
}
}
free(data->master_key_settings);
MifareDesfireApplication* app = data->app_head;
while(app) {
MifareDesfireApplication* next_app = app->next;
if(app->key_settings) {
MifareDesfireKeyVersion* key_version = app->key_settings->key_version_head;
while(key_version) {
MifareDesfireKeyVersion* next_key_version = key_version->next;
free(key_version);
key_version = next_key_version;
}
}
free(app->key_settings);
MifareDesfireFile* file = app->file_head;
while(file) {
MifareDesfireFile* next_file = file->next;
free(file->contents);
free(file);
file = next_file;
}
free(app);
app = next_app;
}
data->free_memory = NULL;
data->master_key_settings = NULL;
data->app_head = NULL;
}
void mf_df_cat_data(MifareDesfireData* data, string_t out) {
mf_df_cat_card_info(data, out);
for(MifareDesfireApplication* app = data->app_head; app; app = app->next) {
mf_df_cat_application(app, out);
}
}
void mf_df_cat_card_info(MifareDesfireData* data, string_t out) {
mf_df_cat_version(&data->version, out);
if(data->free_memory) {
mf_df_cat_free_mem(data->free_memory, out);
}
if(data->master_key_settings) {
mf_df_cat_key_settings(data->master_key_settings, out);
}
}
void mf_df_cat_version(MifareDesfireVersion* version, string_t out) {
string_cat_printf(
out,
"%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
version->uid[0],
version->uid[1],
version->uid[2],
version->uid[3],
version->uid[4],
version->uid[5],
version->uid[6]);
string_cat_printf(
out,
"hw %02x type %02x sub %02x\n"
" maj %02x min %02x\n"
" size %02x proto %02x\n",
version->hw_vendor,
version->hw_type,
version->hw_subtype,
version->hw_major,
version->hw_minor,
version->hw_storage,
version->hw_proto);
string_cat_printf(
out,
"sw %02x type %02x sub %02x\n"
" maj %02x min %02x\n"
" size %02x proto %02x\n",
version->sw_vendor,
version->sw_type,
version->sw_subtype,
version->sw_major,
version->sw_minor,
version->sw_storage,
version->sw_proto);
string_cat_printf(
out,
"batch %02x:%02x:%02x:%02x:%02x\n"
"week %d year %d\n",
version->batch[0],
version->batch[1],
version->batch[2],
version->batch[3],
version->batch[4],
version->prod_week,
version->prod_year);
}
void mf_df_cat_free_mem(MifareDesfireFreeMemory* free_mem, string_t out) {
string_cat_printf(out, "freeMem %d\n", free_mem->bytes);
}
void mf_df_cat_key_settings(MifareDesfireKeySettings* ks, string_t out) {
string_cat_printf(out, "changeKeyID %d\n", ks->change_key_id);
string_cat_printf(out, "configChangeable %d\n", ks->config_changeable);
string_cat_printf(out, "freeCreateDelete %d\n", ks->free_create_delete);
string_cat_printf(out, "freeDirectoryList %d\n", ks->free_directory_list);
string_cat_printf(out, "masterChangeable %d\n", ks->master_key_changeable);
if(ks->flags) {
string_cat_printf(out, "flags %d\n", ks->flags);
}
string_cat_printf(out, "maxKeys %d\n", ks->max_keys);
for(MifareDesfireKeyVersion* kv = ks->key_version_head; kv; kv = kv->next) {
string_cat_printf(out, "key %d version %d\n", kv->id, kv->version);
}
}
void mf_df_cat_application_info(MifareDesfireApplication* app, string_t out) {
string_cat_printf(out, "Application %02x%02x%02x\n", app->id[0], app->id[1], app->id[2]);
if(app->key_settings) {
mf_df_cat_key_settings(app->key_settings, out);
}
}
void mf_df_cat_application(MifareDesfireApplication* app, string_t out) {
mf_df_cat_application_info(app, out);
for(MifareDesfireFile* file = app->file_head; file; file = file->next) {
mf_df_cat_file(file, out);
}
}
void mf_df_cat_file(MifareDesfireFile* file, string_t out) {
char* type = "unknown";
switch(file->type) {
case MifareDesfireFileTypeStandard:
type = "standard";
break;
case MifareDesfireFileTypeBackup:
type = "backup";
break;
case MifareDesfireFileTypeValue:
type = "value";
break;
case MifareDesfireFileTypeLinearRecord:
type = "linear";
break;
case MifareDesfireFileTypeCyclicRecord:
type = "cyclic";
break;
}
char* comm = "unknown";
switch(file->comm) {
case MifareDesfireFileCommunicationSettingsPlaintext:
comm = "plain";
break;
case MifareDesfireFileCommunicationSettingsAuthenticated:
comm = "auth";
break;
case MifareDesfireFileCommunicationSettingsEnciphered:
comm = "enciphered";
break;
}
string_cat_printf(out, "File %d\n", file->id);
string_cat_printf(out, "%s %s\n", type, comm);
string_cat_printf(
out,
"r %d w %d rw %d c %d\n",
file->access_rights >> 12 & 0xF,
file->access_rights >> 8 & 0xF,
file->access_rights >> 4 & 0xF,
file->access_rights & 0xF);
uint16_t size = 0;
uint16_t num = 1;
switch(file->type) {
case MifareDesfireFileTypeStandard:
case MifareDesfireFileTypeBackup:
size = file->settings.data.size;
string_cat_printf(out, "size %d\n", size);
break;
case MifareDesfireFileTypeValue:
size = 4;
string_cat_printf(
out, "lo %d hi %d\n", file->settings.value.lo_limit, file->settings.value.hi_limit);
string_cat_printf(
out,
"limit %d enabled %d\n",
file->settings.value.limited_credit_value,
file->settings.value.limited_credit_enabled);
break;
case MifareDesfireFileTypeLinearRecord:
case MifareDesfireFileTypeCyclicRecord:
size = file->settings.record.size;
num = file->settings.record.cur;
string_cat_printf(out, "size %d\n", size);
string_cat_printf(out, "num %d max %d\n", num, file->settings.record.max);
break;
}
uint8_t* data = file->contents;
if(data) {
for(int rec = 0; rec < num; rec++) {
for(int ch = 0; ch < size; ch++) {
string_cat_printf(out, "%02x", data[rec * size + ch]);
}
string_cat_printf(out, " \n");
}
}
}
bool mf_df_check_card_type(uint8_t ATQA0, uint8_t ATQA1, uint8_t SAK) {
return ATQA0 == 0x44 && ATQA1 == 0x03 && SAK == 0x20;
}
uint16_t mf_df_prepare_get_version(uint8_t* dest) {
dest[0] = MF_DF_GET_VERSION;
return 1;
}
bool mf_df_parse_get_version_response(uint8_t* buf, uint16_t len, MifareDesfireVersion* out) {
if(len < 1 || *buf) {
return false;
}
len--;
buf++;
if(len < sizeof(MifareDesfireVersion)) {
return false;
}
memcpy(out, buf, sizeof(MifareDesfireVersion));
return true;
}
uint16_t mf_df_prepare_get_free_memory(uint8_t* dest) {
dest[0] = MF_DF_GET_FREE_MEMORY;
return 1;
}
bool mf_df_parse_get_free_memory_response(uint8_t* buf, uint16_t len, MifareDesfireFreeMemory* out) {
if(len < 1 || *buf) {
return false;
}
len--;
buf++;
if(len != 3) {
return false;
}
out->bytes = buf[0] | (buf[1] << 8) | (buf[2] << 16);
return true;
}
uint16_t mf_df_prepare_get_key_settings(uint8_t* dest) {
dest[0] = MF_DF_GET_KEY_SETTINGS;
return 1;
}
bool mf_df_parse_get_key_settings_response(
uint8_t* buf,
uint16_t len,
MifareDesfireKeySettings* out) {
if(len < 1 || *buf) {
return false;
}
len--;
buf++;
if(len < 2) {
return false;
}
out->change_key_id = buf[0] >> 4;
out->config_changeable = (buf[0] & 0x8) != 0;
out->free_create_delete = (buf[0] & 0x4) != 0;
out->free_directory_list = (buf[0] & 0x2) != 0;
out->master_key_changeable = (buf[0] & 0x1) != 0;
out->flags = buf[1] >> 4;
out->max_keys = buf[1] & 0xF;
return true;
}
uint16_t mf_df_prepare_get_key_version(uint8_t* dest, uint8_t key_id) {
dest[0] = MF_DF_GET_KEY_VERSION;
dest[1] = key_id;
return 2;
}
bool mf_df_parse_get_key_version_response(uint8_t* buf, uint16_t len, MifareDesfireKeyVersion* out) {
if(len != 2 || *buf) {
return false;
}
out->version = buf[1];
return true;
}
uint16_t mf_df_prepare_get_application_ids(uint8_t* dest) {
dest[0] = MF_DF_GET_APPLICATION_IDS;
return 1;
}
bool mf_df_parse_get_application_ids_response(
uint8_t* buf,
uint16_t len,
MifareDesfireApplication** app_head) {
if(len < 1 || *buf) {
return false;
}
len--;
buf++;
if(len % 3 != 0) {
return false;
}
while(len) {
MifareDesfireApplication* app = malloc(sizeof(MifareDesfireApplication));
memset(app, 0, sizeof(MifareDesfireApplication));
memcpy(app->id, buf, 3);
len -= 3;
buf += 3;
*app_head = app;
app_head = &app->next;
}
return true;
}
uint16_t mf_df_prepare_select_application(uint8_t* dest, uint8_t id[3]) {
dest[0] = MF_DF_SELECT_APPLICATION;
dest[1] = id[0];
dest[2] = id[1];
dest[3] = id[2];
return 4;
}
bool mf_df_parse_select_application_response(uint8_t* buf, uint16_t len) {
return len == 1 && !*buf;
}
uint16_t mf_df_prepare_get_file_ids(uint8_t* dest) {
dest[0] = MF_DF_GET_FILE_IDS;
return 1;
}
bool mf_df_parse_get_file_ids_response(uint8_t* buf, uint16_t len, MifareDesfireFile** file_head) {
if(len < 1 || *buf) {
return false;
}
len--;
buf++;
while(len) {
MifareDesfireFile* file = malloc(sizeof(MifareDesfireFile));
memset(file, 0, sizeof(MifareDesfireFile));
file->id = *buf;
len--;
buf++;
*file_head = file;
file_head = &file->next;
}
return true;
}
uint16_t mf_df_prepare_get_file_settings(uint8_t* dest, uint8_t file_id) {
dest[0] = MF_DF_GET_FILE_SETTINGS;
dest[1] = file_id;
return 2;
}
bool mf_df_parse_get_file_settings_response(uint8_t* buf, uint16_t len, MifareDesfireFile* out) {
if(len < 5 || *buf) {
return false;
}
len--;
buf++;
out->type = buf[0];
out->comm = buf[1];
out->access_rights = buf[2] | (buf[3] << 8);
switch(out->type) {
case MifareDesfireFileTypeStandard:
case MifareDesfireFileTypeBackup:
if(len != 7) {
return false;
}
out->settings.data.size = buf[4] | (buf[5] << 8) | (buf[6] << 16);
break;
case MifareDesfireFileTypeValue:
if(len != 17) {
return false;
}
out->settings.value.lo_limit = buf[4] | (buf[5] << 8) | (buf[6] << 16) | (buf[7] << 24);
out->settings.value.hi_limit = buf[8] | (buf[9] << 8) | (buf[10] << 16) | (buf[11] << 24);
out->settings.value.limited_credit_value = buf[12] | (buf[13] << 8) | (buf[14] << 16) |
(buf[15] << 24);
out->settings.value.limited_credit_enabled = buf[16];
break;
case MifareDesfireFileTypeLinearRecord:
case MifareDesfireFileTypeCyclicRecord:
if(len != 13) {
return false;
}
out->settings.record.size = buf[4] | (buf[5] << 8) | (buf[6] << 16);
out->settings.record.max = buf[7] | (buf[8] << 8) | (buf[9] << 16);
out->settings.record.cur = buf[10] | (buf[11] << 8) | (buf[12] << 16);
break;
default:
return false;
}
return true;
}
uint16_t mf_df_prepare_read_data(uint8_t* dest, uint8_t file_id, uint32_t offset, uint32_t len) {
dest[0] = MF_DF_READ_DATA;
dest[1] = file_id;
dest[2] = offset;
dest[3] = offset >> 8;
dest[4] = offset >> 16;
dest[5] = len;
dest[6] = len >> 8;
dest[7] = len >> 16;
return 8;
}
uint16_t mf_df_prepare_get_value(uint8_t* dest, uint8_t file_id) {
dest[0] = MF_DF_GET_VALUE;
dest[1] = file_id;
return 2;
}
uint16_t
mf_df_prepare_read_records(uint8_t* dest, uint8_t file_id, uint32_t offset, uint32_t len) {
dest[0] = MF_DF_READ_RECORDS;
dest[1] = file_id;
dest[2] = offset;
dest[3] = offset >> 8;
dest[4] = offset >> 16;
dest[5] = len;
dest[6] = len >> 8;
dest[7] = len >> 16;
return 8;
}
bool mf_df_parse_read_data_response(uint8_t* buf, uint16_t len, MifareDesfireFile* out) {
if(len < 1 || *buf) {
return false;
}
len--;
buf++;
out->contents = malloc(len);
memcpy(out->contents, buf, len);
return true;
}
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