mirror of
https://github.com/DarkFlippers/unleashed-firmware
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f6eb79e1e5
* Merge remote-tracking branch 'origin/dev' into dev * Add basic API interface (inspired by advanced plugins example), modify NfcSupportedCardsLoadContext to contain a pointer to a resolver * WIP: API resolver implemented / passed to plugin via context, still having resolution issues * Attempt to add constants to the nfc_app_api_table list * WIP: We're defining the constants directly in nfc_app_api.c to see if this fixes our woes, which it does not. * WIP: Remove furi_assert(false) (lmao) * Working implementation of Gallagher decoding via exposed plugin API * lib: api_hashtable: change log level for symbol not found message * nfc app: alloc composite resolver along with supported cards * nfc app: rework nfc api structure * nfc app: fix memory leakage in supported cards Co-authored-by: gornekich <n.gorbadey@gmail.com>
87 lines
No EOL
3.2 KiB
C
87 lines
No EOL
3.2 KiB
C
/* gallagher.c - NFC supported cards plugin for Gallagher access control cards (New Zealand).
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* Author: Nick Mooney (nick@mooney.nz)
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*
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* Reference: https://github.com/megabug/gallagher-research
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*/
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#include "nfc_supported_card_plugin.h"
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#include "../../api/gallagher/gallagher_util.h"
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#include <flipper_application/flipper_application.h>
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#include <nfc/protocols/mf_classic/mf_classic.h>
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#include <nfc/protocols/mf_classic/mf_classic_poller_sync.h>
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#include <nfc/helpers/nfc_util.h>
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static bool gallagher_parse(const NfcDevice* device, FuriString* parsed_data) {
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furi_assert(device);
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furi_assert(parsed_data);
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const MfClassicData* data = nfc_device_get_data(device, NfcProtocolMfClassic);
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if(!(data->type == MfClassicType1k || data->type == MfClassicType4k)) {
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return false;
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}
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// It's possible for a single tag to contain multiple credentials,
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// but this is currently unimplementecd.
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const uint8_t credential_sector_start_block_number =
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mf_classic_get_first_block_num_of_sector(GALLAGHER_CREDENTIAL_SECTOR);
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// Test 1: The first 8 bytes and the second 8 bytes should be bitwise inverses.
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const uint8_t* credential_block_start_ptr =
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&data->block[credential_sector_start_block_number].data[0];
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uint64_t cardholder_credential = nfc_util_bytes2num(credential_block_start_ptr, 8);
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uint64_t cardholder_credential_inverse = nfc_util_bytes2num(credential_block_start_ptr + 8, 8);
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// Due to endianness, this is testing the bytes in the wrong order,
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// but the result still should be correct.
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if(cardholder_credential != ~cardholder_credential_inverse) {
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return false;
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}
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// Test 2: The contents of the second block should be equal to the GALLAGHER_CARDAX_ASCII constant.
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const uint8_t* cardax_block_start_ptr =
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&data->block[credential_sector_start_block_number + 1].data[0];
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if(memcmp(cardax_block_start_ptr, GALLAGHER_CARDAX_ASCII, MF_CLASSIC_BLOCK_SIZE) != 0) {
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return false;
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}
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// Deobfuscate the credential data
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GallagherCredential credential;
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gallagher_deobfuscate_and_parse_credential(&credential, credential_block_start_ptr);
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char display_region = 'A';
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// Per https://github.com/megabug/gallagher-research/blob/master/formats/cardholder/cardholder.md,
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// regions are generally A-P.
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if(credential.region < 16) {
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display_region = display_region + (char)credential.region;
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} else {
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display_region = '?';
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}
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furi_string_cat_printf(
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parsed_data,
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"\e#Gallagher NZ\nFacility %c%u\nCard %lu (IL %u)",
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display_region,
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credential.facility,
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credential.card,
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credential.issue);
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return true;
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}
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static const NfcSupportedCardsPlugin gallagher_plugin = {
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.protocol = NfcProtocolMfClassic,
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.verify = NULL,
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.read = NULL,
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.parse = gallagher_parse,
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};
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static const FlipperAppPluginDescriptor gallagher_plugin_descriptor = {
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.appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
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.ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
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.entry_point = &gallagher_plugin,
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};
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/* Plugin entry point */
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const FlipperAppPluginDescriptor* gallagher_plugin_ep() {
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return &gallagher_plugin_descriptor;
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} |