nfc: Mifare Ultralight C detection

applications/main/nfc/scenes/nfc_scene_mf_ultralight_menu.c

@@ -19,7 +19,7 @@ void nfc_scene_mf_ultralight_menu_on_enter(void* context) {
     Submenu* submenu = nfc->submenu;
     MfUltralightData* data = &nfc->dev->dev_data.mf_ul_data;
 
-    if(!mf_ul_is_full_capture(data)) {
+    if(!mf_ul_is_full_capture(data) && data->type != MfUltralightTypeULC) {
         submenu_add_item(
             submenu,
             "Unlock",
@@ -29,12 +29,14 @@ void nfc_scene_mf_ultralight_menu_on_enter(void* context) {
     }
     submenu_add_item(
         submenu, "Save", SubmenuIndexSave, nfc_scene_mf_ultralight_menu_submenu_callback, nfc);
-    submenu_add_item(
-        submenu,
-        "Emulate",
-        SubmenuIndexEmulate,
-        nfc_scene_mf_ultralight_menu_submenu_callback,
-        nfc);
+    if(mf_ul_emulation_supported(data)) {
+        submenu_add_item(
+            submenu,
+            "Emulate",
+            SubmenuIndexEmulate,
+            nfc_scene_mf_ultralight_menu_submenu_callback,
+            nfc);
+    }
     submenu_add_item(
         submenu, "Info", SubmenuIndexInfo, nfc_scene_mf_ultralight_menu_submenu_callback, nfc);
 

applications/main/nfc/scenes/nfc_scene_saved_menu.c

@@ -42,7 +42,8 @@ void nfc_scene_saved_menu_on_enter(void* context) {
                 nfc);
         }
     } else if(
-        nfc->dev->format == NfcDeviceSaveFormatMifareUl ||
+        (nfc->dev->format == NfcDeviceSaveFormatMifareUl &&
+         mf_ul_emulation_supported(&nfc->dev->dev_data.mf_ul_data)) ||
         nfc->dev->format == NfcDeviceSaveFormatMifareClassic) {
         submenu_add_item(
             submenu, "Emulate", SubmenuIndexEmulate, nfc_scene_saved_menu_submenu_callback, nfc);
@@ -72,6 +73,7 @@ void nfc_scene_saved_menu_on_enter(void* context) {
     submenu_add_item(
         submenu, "Info", SubmenuIndexInfo, nfc_scene_saved_menu_submenu_callback, nfc);
     if(nfc->dev->format == NfcDeviceSaveFormatMifareUl &&
+       nfc->dev->dev_data.mf_ul_data.type != MfUltralightTypeULC &&
        !mf_ul_is_full_capture(&nfc->dev->dev_data.mf_ul_data)) {
         submenu_add_item(
             submenu,

firmware/targets/f7/api_symbols.csv

@@ -2013,6 +2013,7 @@ Function,-,mf_df_prepare_read_records,uint16_t,"uint8_t*, uint8_t, uint32_t, uin
 Function,-,mf_df_prepare_select_application,uint16_t,"uint8_t*, uint8_t[3]"
 Function,-,mf_df_read_card,_Bool,"FuriHalNfcTxRxContext*, MifareDesfireData*"
 Function,-,mf_ul_check_card_type,_Bool,"uint8_t, uint8_t, uint8_t"
+Function,-,mf_ul_emulation_supported,_Bool,MfUltralightData*
 Function,-,mf_ul_is_full_capture,_Bool,MfUltralightData*
 Function,-,mf_ul_prepare_emulation,void,"MfUltralightEmulator*, MfUltralightData*"
 Function,-,mf_ul_prepare_emulation_response,_Bool,"uint8_t*, uint16_t, uint8_t*, uint16_t*, uint32_t*, void*"

lib/nfc/nfc_types.c

@@ -45,6 +45,8 @@ const char* nfc_mf_ul_type(MfUltralightType type, bool full_name) {
         return "NTAG I2C Plus 2K";
     } else if(type == MfUltralightTypeNTAG203) {
         return "NTAG203";
+    } else if(type == MfUltralightTypeULC) {
+        return "Mifare Ultralight C";
     } else if(type == MfUltralightTypeUL11 && full_name) {
         return "Mifare Ultralight 11";
     } else if(type == MfUltralightTypeUL21 && full_name) {

lib/nfc/protocols/mifare_ultralight.c

@@ -79,6 +79,8 @@ static MfUltralightFeatures mf_ul_get_features(MfUltralightType type) {
                MfUltralightSupportSectorSelect;
     case MfUltralightTypeNTAG203:
         return MfUltralightSupportCompatWrite | MfUltralightSupportCounterInMemory;
+    case MfUltralightTypeULC:
+        return MfUltralightSupportCompatWrite | MfUltralightSupport3DesAuth;
     default:
         // Assumed original MFUL 512-bit
         return MfUltralightSupportCompatWrite;
@@ -95,6 +97,11 @@ static void mf_ul_set_version_ntag203(MfUltralightReader* reader, MfUltralightDa
     reader->pages_to_read = 42;
 }
 
+static void mf_ul_set_version_ulc(MfUltralightReader* reader, MfUltralightData* data) {
+    data->type = MfUltralightTypeULC;
+    reader->pages_to_read = 48;
+}
+
 bool mf_ultralight_read_version(
     FuriHalNfcTxRxContext* tx_rx,
     MfUltralightReader* reader,
@@ -175,7 +182,7 @@ bool mf_ultralight_authenticate(FuriHalNfcTxRxContext* tx_rx, uint32_t key, uint
 
     do {
         FURI_LOG_D(TAG, "Authenticating");
-        tx_rx->tx_data[0] = MF_UL_AUTH;
+        tx_rx->tx_data[0] = MF_UL_PWD_AUTH;
         nfc_util_num2bytes(key, 4, &tx_rx->tx_data[1]);
         tx_rx->tx_bits = 40;
         tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
@@ -716,6 +723,21 @@ bool mf_ultralight_read_tearing_flags(FuriHalNfcTxRxContext* tx_rx, MfUltralight
     return flag_read == 2;
 }
 
+static bool mf_ul_probe_3des_auth(FuriHalNfcTxRxContext* tx_rx) {
+    tx_rx->tx_data[0] = MF_UL_AUTHENTICATE_1;
+    tx_rx->tx_data[1] = 0;
+    tx_rx->tx_bits = 16;
+    tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
+    bool rc = furi_hal_nfc_tx_rx(tx_rx, 50) && tx_rx->rx_bits == 9 * 8 &&
+              tx_rx->rx_data[0] == 0xAF;
+
+    // Reset just in case, we're not going to finish authenticating and need to if tag doesn't support auth
+    furi_hal_nfc_sleep();
+    furi_hal_nfc_activate_nfca(300, NULL);
+
+    return rc;
+}
+
 bool mf_ul_read_card(
     FuriHalNfcTxRxContext* tx_rx,
     MfUltralightReader* reader,
@@ -733,16 +755,20 @@ bool mf_ul_read_card(
             mf_ultralight_read_signature(tx_rx, data);
         }
     } else {
-        // No GET_VERSION command, check for NTAG203 by reading last page (41)
         uint8_t dummy[16];
-        if(mf_ultralight_read_pages_direct(tx_rx, 41, dummy)) {
+        // No GET_VERSION command, check if AUTHENTICATE command available (detect UL C).
+        if(mf_ul_probe_3des_auth(tx_rx)) {
+            mf_ul_set_version_ulc(reader, data);
+        } else if(mf_ultralight_read_pages_direct(tx_rx, 41, dummy)) {
+            // No AUTHENTICATE, check for NTAG203 by reading last page (41)
             mf_ul_set_version_ntag203(reader, data);
-            reader->supported_features = mf_ul_get_features(data->type);
         } else {
             // We're really an original Mifare Ultralight, reset tag for safety
             furi_hal_nfc_sleep();
             furi_hal_nfc_activate_nfca(300, NULL);
         }
+
+        reader->supported_features = mf_ul_get_features(data->type);
     }
 
     card_read = mf_ultralight_read_pages(tx_rx, reader, data);
@@ -1228,6 +1254,10 @@ static void mf_ul_emulate_write(
     emulator->data_changed = true;
 }
 
+bool mf_ul_emulation_supported(MfUltralightData* data) {
+    return data->type != MfUltralightTypeULC;
+}
+
 void mf_ul_reset_emulation(MfUltralightEmulator* emulator, bool is_power_cycle) {
     emulator->comp_write_cmd_started = false;
     emulator->sector_select_cmd_started = false;
@@ -1732,7 +1762,7 @@ bool mf_ul_prepare_emulation_response(
                     }
                 }
             }
-        } else if(cmd == MF_UL_AUTH) {
+        } else if(cmd == MF_UL_PWD_AUTH) {
             if(emulator->supported_features & MfUltralightSupportAuth) {
                 if(buff_rx_len == (1 + 4) * 8) {
                     // Record password sent by PCD

lib/nfc/protocols/mifare_ultralight.h

@@ -16,7 +16,8 @@
 #define MF_UL_COMP_WRITE (0xA0)
 #define MF_UL_READ_CNT (0x39)
 #define MF_UL_INC_CNT (0xA5)
-#define MF_UL_AUTH (0x1B)
+#define MF_UL_AUTHENTICATE_1 (0x1A)
+#define MF_UL_PWD_AUTH (0x1B)
 #define MF_UL_READ_SIG (0x3C)
 #define MF_UL_CHECK_TEARING (0x3E)
 #define MF_UL_READ_VCSL (0x4B)
@@ -41,6 +42,7 @@ typedef enum {
 typedef enum {
     MfUltralightTypeUnknown,
     MfUltralightTypeNTAG203,
+    MfUltralightTypeULC,
     // Below have config pages and GET_VERSION support
     MfUltralightTypeUL11,
     MfUltralightTypeUL21,
@@ -77,6 +79,7 @@ typedef enum {
     MfUltralightSupportAsciiMirror = 1 << 11,
     // NTAG203 counter that's in memory rather than through a command
     MfUltralightSupportCounterInMemory = 1 << 12,
+    MfUltralightSupport3DesAuth = 1 << 13,
 } MfUltralightFeatures;
 
 typedef enum {
@@ -237,6 +240,8 @@ bool mf_ul_read_card(
     MfUltralightReader* reader,
     MfUltralightData* data);
 
+bool mf_ul_emulation_supported(MfUltralightData* data);
+
 void mf_ul_reset_emulation(MfUltralightEmulator* emulator, bool is_power_cycle);
 
 void mf_ul_prepare_emulation(MfUltralightEmulator* emulator, MfUltralightData* data);