nfc: make dict attack more interactive (#1462)

* nfc: deduplify dict attack worker code
* nfc: make dict attack more interactive

Co-authored-by: gornekich <[email protected]>
Co-authored-by: あく <[email protected]>

applications/nfc/scenes/nfc_scene_mf_classic_dict_attack.c

@@ -1,5 +1,7 @@
 #include "../nfc_i.h"
 
+#define TAG "NfcMfClassicDictAttack"
+
 typedef enum {
     DictAttackStateIdle,
     DictAttackStateUserDictInProgress,
@@ -32,7 +34,9 @@ static void nfc_scene_mf_classic_dict_attack_update_view(Nfc* nfc) {
 
 static void nfc_scene_mf_classic_dict_attack_prepare_view(Nfc* nfc, DictAttackState state) {
     MfClassicData* data = &nfc->dev->dev_data.mf_classic_data;
+    NfcMfClassicDictAttackData* dict_attack_data = &nfc->dev->dev_data.mf_classic_dict_attack_data;
     NfcWorkerState worker_state = NfcWorkerStateReady;
+    MfClassicDict* dict = NULL;
 
     // Identify scene state
     if(state == DictAttackStateIdle) {
@@ -47,16 +51,36 @@ static void nfc_scene_mf_classic_dict_attack_prepare_view(Nfc* nfc, DictAttackSt
 
     // Setup view
     if(state == DictAttackStateUserDictInProgress) {
-        worker_state = NfcWorkerStateMfClassicUserDictAttack;
+        worker_state = NfcWorkerStateMfClassicDictAttack;
         dict_attack_set_header(nfc->dict_attack, "Mf Classic User Dict.");
-    } else if(state == DictAttackStateFlipperDictInProgress) {
-        worker_state = NfcWorkerStateMfClassicFlipperDictAttack;
+        dict = mf_classic_dict_alloc(MfClassicDictTypeUser);
+
+        // If failed to load user dictionary - try flipper dictionary
+        if(!dict) {
+            FURI_LOG_E(TAG, "User dictionary not found");
+            state = DictAttackStateFlipperDictInProgress;
+        }
+    }
+    if(state == DictAttackStateFlipperDictInProgress) {
+        worker_state = NfcWorkerStateMfClassicDictAttack;
         dict_attack_set_header(nfc->dict_attack, "Mf Classic Flipper Dict.");
+        dict = mf_classic_dict_alloc(MfClassicDictTypeFlipper);
+        if(!dict) {
+            FURI_LOG_E(TAG, "Flipper dictionary not found");
+            // Pass through to let worker handle the failure
+        }
+    }
+    // Free previous dictionary
+    if(dict_attack_data->dict) {
+        mf_classic_dict_free(dict_attack_data->dict);
     }
+    dict_attack_data->dict = dict;
     scene_manager_set_scene_state(nfc->scene_manager, NfcSceneMfClassicDictAttack, state);
     dict_attack_set_callback(nfc->dict_attack, nfc_dict_attack_dict_attack_result_callback, nfc);
     dict_attack_set_current_sector(nfc->dict_attack, 0);
     dict_attack_set_card_detected(nfc->dict_attack, data->type);
+    dict_attack_set_total_dict_keys(
+        nfc->dict_attack, dict ? mf_classic_dict_get_total_keys(dict) : 0);
     nfc_scene_mf_classic_dict_attack_update_view(nfc);
     nfc_worker_start(
         nfc->worker, worker_state, &nfc->dev->dev_data, nfc_dict_attack_worker_callback, nfc);
@@ -112,6 +136,10 @@ bool nfc_scene_mf_classic_dict_attack_on_event(void* context, SceneManagerEvent
             nfc_scene_mf_classic_dict_attack_update_view(nfc);
             dict_attack_inc_current_sector(nfc->dict_attack);
             consumed = true;
+        } else if(event.event == NfcWorkerEventNewDictKeyBatch) {
+            nfc_scene_mf_classic_dict_attack_update_view(nfc);
+            dict_attack_inc_current_dict_key(nfc->dict_attack, NFC_DICT_KEY_BATCH_SIZE);
+            consumed = true;
         } else if(event.event == NfcCustomEventDictAttackSkip) {
             if(state == DictAttackStateUserDictInProgress) {
                 nfc_worker_stop(nfc->worker);
@@ -130,8 +158,13 @@ bool nfc_scene_mf_classic_dict_attack_on_event(void* context, SceneManagerEvent
 
 void nfc_scene_mf_classic_dict_attack_on_exit(void* context) {
     Nfc* nfc = context;
+    NfcMfClassicDictAttackData* dict_attack_data = &nfc->dev->dev_data.mf_classic_dict_attack_data;
     // Stop worker
     nfc_worker_stop(nfc->worker);
+    if(dict_attack_data->dict) {
+        mf_classic_dict_free(dict_attack_data->dict);
+        dict_attack_data->dict = NULL;
+    }
     dict_attack_reset(nfc->dict_attack);
     nfc_blink_stop(nfc);
 }

applications/nfc/views/dict_attack.c

@@ -23,6 +23,8 @@ typedef struct {
     uint8_t sector_current;
     uint8_t keys_total;
     uint8_t keys_found;
+    uint16_t dict_keys_total;
+    uint16_t dict_keys_current;
 } DictAttackViewModel;
 
 static void dict_attack_draw_callback(Canvas* canvas, void* model) {
@@ -38,8 +40,15 @@ static void dict_attack_draw_callback(Canvas* canvas, void* model) {
         canvas_set_font(canvas, FontPrimary);
         canvas_draw_str_aligned(canvas, 64, 2, AlignCenter, AlignTop, string_get_cstr(m->header));
         canvas_set_font(canvas, FontSecondary);
-        float progress =
-            m->sectors_total == 0 ? 0 : (float)(m->sector_current) / (float)(m->sectors_total);
+        float dict_progress = m->dict_keys_total == 0 ?
+                                  0 :
+                                  (float)(m->dict_keys_current) / (float)(m->dict_keys_total);
+        float progress = m->sectors_total == 0 ? 0 :
+                                                 ((float)(m->sector_current) + dict_progress) /
+                                                     (float)(m->sectors_total);
+        if(progress > 1.0) {
+            progress = 1.0;
+        }
         elements_progress_bar(canvas, 5, 15, 120, progress);
         canvas_set_font(canvas, FontSecondary);
         snprintf(draw_str, sizeof(draw_str), "Keys found: %d/%d", m->keys_found, m->keys_total);
@@ -100,6 +109,8 @@ void dict_attack_reset(DictAttack* dict_attack) {
             model->sector_current = 0;
             model->keys_total = 0;
             model->keys_found = 0;
+            model->dict_keys_total = 0;
+            model->dict_keys_current = 0;
             string_reset(model->header);
             return false;
         });
@@ -171,6 +182,7 @@ void dict_attack_set_current_sector(DictAttack* dict_attack, uint8_t curr_sec) {
     with_view_model(
         dict_attack->view, (DictAttackViewModel * model) {
             model->sector_current = curr_sec;
+            model->dict_keys_current = 0;
             return true;
         });
 }
@@ -181,6 +193,7 @@ void dict_attack_inc_current_sector(DictAttack* dict_attack) {
         dict_attack->view, (DictAttackViewModel * model) {
             if(model->sector_current < model->sectors_total) {
                 model->sector_current++;
+                model->dict_keys_current = 0;
             }
             return true;
         });
@@ -196,3 +209,23 @@ void dict_attack_inc_keys_found(DictAttack* dict_attack) {
             return true;
         });
 }
+
+void dict_attack_set_total_dict_keys(DictAttack* dict_attack, uint16_t dict_keys_total) {
+    furi_assert(dict_attack);
+    with_view_model(
+        dict_attack->view, (DictAttackViewModel * model) {
+            model->dict_keys_total = dict_keys_total;
+            return true;
+        });
+}
+
+void dict_attack_inc_current_dict_key(DictAttack* dict_attack, uint16_t keys_tried) {
+    furi_assert(dict_attack);
+    with_view_model(
+        dict_attack->view, (DictAttackViewModel * model) {
+            if(model->dict_keys_current + keys_tried < model->dict_keys_total) {
+                model->dict_keys_current += keys_tried;
+            }
+            return true;
+        });
+}

applications/nfc/views/dict_attack.h

@@ -34,3 +34,7 @@ void dict_attack_set_current_sector(DictAttack* dict_attack, uint8_t curr_sec);
 void dict_attack_inc_current_sector(DictAttack* dict_attack);
 
 void dict_attack_inc_keys_found(DictAttack* dict_attack);
+
+void dict_attack_set_total_dict_keys(DictAttack* dict_attack, uint16_t dict_keys_total);
+
+void dict_attack_inc_current_dict_key(DictAttack* dict_attack, uint16_t keys_tried);

lib/nfc/nfc_device.h

@@ -6,13 +6,15 @@
 #include <dialogs/dialogs.h>
 
 #include <furi_hal_nfc.h>
+#include <lib/nfc/helpers/mf_classic_dict.h>
 #include <lib/nfc/protocols/emv.h>
 #include <lib/nfc/protocols/mifare_ultralight.h>
 #include <lib/nfc/protocols/mifare_classic.h>
 #include <lib/nfc/protocols/mifare_desfire.h>
 
 #define NFC_DEV_NAME_MAX_LEN 22
 #define NFC_READER_DATA_MAX_SIZE 64
+#define NFC_DICT_KEY_BATCH_SIZE 50
 
 #define NFC_APP_FOLDER ANY_PATH("nfc")
 #define NFC_APP_EXTENSION ".nfc"
@@ -41,10 +43,17 @@ typedef struct {
     uint16_t size;
 } NfcReaderRequestData;
 
+typedef struct {
+    MfClassicDict* dict;
+} NfcMfClassicDictAttackData;
+
 typedef struct {
     FuriHalNfcDevData nfc_data;
     NfcProtocol protocol;
-    NfcReaderRequestData reader_data;
+    union {
+        NfcReaderRequestData reader_data;
+        NfcMfClassicDictAttackData mf_classic_dict_attack_data;
+    };
     union {
         EmvData emv_data;
         MfUltralightData mf_ul_data;

lib/nfc/nfc_worker.c

@@ -101,10 +101,8 @@ int32_t nfc_worker_task(void* context) {
         nfc_worker_emulate_mf_ultralight(nfc_worker);
     } else if(nfc_worker->state == NfcWorkerStateMfClassicEmulate) {
         nfc_worker_emulate_mf_classic(nfc_worker);
-    } else if(nfc_worker->state == NfcWorkerStateMfClassicUserDictAttack) {
-        nfc_worker_mf_classic_dict_attack(nfc_worker, MfClassicDictTypeUser);
-    } else if(nfc_worker->state == NfcWorkerStateMfClassicFlipperDictAttack) {
-        nfc_worker_mf_classic_dict_attack(nfc_worker, MfClassicDictTypeFlipper);
+    } else if(nfc_worker->state == NfcWorkerStateMfClassicDictAttack) {
+        nfc_worker_mf_classic_dict_attack(nfc_worker);
     }
     furi_hal_nfc_sleep();
     nfc_worker_change_state(nfc_worker, NfcWorkerStateReady);
@@ -397,35 +395,43 @@ void nfc_worker_emulate_mf_ultralight(NfcWorker* nfc_worker) {
     }
 }
 
-void nfc_worker_mf_classic_dict_attack(NfcWorker* nfc_worker, MfClassicDictType type) {
+void nfc_worker_mf_classic_dict_attack(NfcWorker* nfc_worker) {
     furi_assert(nfc_worker);
     furi_assert(nfc_worker->callback);
 
     MfClassicData* data = &nfc_worker->dev_data->mf_classic_data;
+    NfcMfClassicDictAttackData* dict_attack_data =
+        &nfc_worker->dev_data->mf_classic_dict_attack_data;
     uint32_t total_sectors = mf_classic_get_total_sectors_num(data->type);
     uint64_t key = 0;
     FuriHalNfcTxRxContext tx_rx = {};
     bool card_found_notified = true;
     bool card_removed_notified = false;
 
     // Load dictionary
-    MfClassicDict* dict = mf_classic_dict_alloc(type);
+    MfClassicDict* dict = dict_attack_data->dict;
     if(!dict) {
         FURI_LOG_E(TAG, "Dictionary not found");
         nfc_worker->callback(NfcWorkerEventNoDictFound, nfc_worker->context);
-        mf_classic_dict_free(dict);
         return;
     }
 
-    FURI_LOG_D(TAG, "Start Dictionary attack");
+    FURI_LOG_D(
+        TAG,
+        "Start Dictionary attack, Key Count %d",
+        mf_classic_dict_get_total_keys(dict));
     for(size_t i = 0; i < total_sectors; i++) {
         FURI_LOG_I(TAG, "Sector %d", i);
         nfc_worker->callback(NfcWorkerEventNewSector, nfc_worker->context);
         uint8_t block_num = mf_classic_get_sector_trailer_block_num_by_sector(i);
         if(mf_classic_is_sector_read(data, i)) continue;
         bool is_key_a_found = mf_classic_is_key_found(data, i, MfClassicKeyA);
         bool is_key_b_found = mf_classic_is_key_found(data, i, MfClassicKeyB);
+        uint16_t key_index = 0;
         while(mf_classic_dict_get_next_key(dict, &key)) {
+            if(++key_index % NFC_DICT_KEY_BATCH_SIZE == 0) {
+                nfc_worker->callback(NfcWorkerEventNewDictKeyBatch, nfc_worker->context);
+            }
             furi_hal_nfc_sleep();
             if(furi_hal_nfc_activate_nfca(200, NULL)) {
                 furi_hal_nfc_sleep();
@@ -456,29 +462,24 @@ void nfc_worker_mf_classic_dict_attack(NfcWorker* nfc_worker, MfClassicDictType
                     }
                 }
                 if(is_key_a_found && is_key_b_found) break;
-                if(!((nfc_worker->state == NfcWorkerStateMfClassicUserDictAttack) ||
-                     (nfc_worker->state == NfcWorkerStateMfClassicFlipperDictAttack)))
+                if(nfc_worker->state != NfcWorkerStateMfClassicDictAttack)
                     break;
             } else {
                 if(!card_removed_notified) {
                     nfc_worker->callback(NfcWorkerEventNoCardDetected, nfc_worker->context);
                     card_removed_notified = true;
                     card_found_notified = false;
                 }
-                if(!((nfc_worker->state == NfcWorkerStateMfClassicUserDictAttack) ||
-                     (nfc_worker->state == NfcWorkerStateMfClassicFlipperDictAttack)))
+                if(nfc_worker->state != NfcWorkerStateMfClassicDictAttack)
                     break;
             }
         }
-        if(!((nfc_worker->state == NfcWorkerStateMfClassicUserDictAttack) ||
-             (nfc_worker->state == NfcWorkerStateMfClassicFlipperDictAttack)))
+        if(nfc_worker->state != NfcWorkerStateMfClassicDictAttack)
             break;
         mf_classic_read_sector(&tx_rx, data, i);
         mf_classic_dict_rewind(dict);
     }
-    mf_classic_dict_free(dict);
-    if((nfc_worker->state == NfcWorkerStateMfClassicUserDictAttack) ||
-       (nfc_worker->state == NfcWorkerStateMfClassicFlipperDictAttack)) {
+    if(nfc_worker->state == NfcWorkerStateMfClassicDictAttack) {
         nfc_worker->callback(NfcWorkerEventSuccess, nfc_worker->context);
     } else {
         nfc_worker->callback(NfcWorkerEventAborted, nfc_worker->context);

lib/nfc/nfc_worker.h

@@ -14,8 +14,7 @@ typedef enum {
     NfcWorkerStateUidEmulate,
     NfcWorkerStateMfUltralightEmulate,
     NfcWorkerStateMfClassicEmulate,
-    NfcWorkerStateMfClassicUserDictAttack,
-    NfcWorkerStateMfClassicFlipperDictAttack,
+    NfcWorkerStateMfClassicDictAttack,
     // Debug
     NfcWorkerStateEmulateApdu,
     NfcWorkerStateField,
@@ -49,6 +48,7 @@ typedef enum {
     // Mifare Classic events
     NfcWorkerEventNoDictFound,
     NfcWorkerEventNewSector,
+    NfcWorkerEventNewDictKeyBatch,
     NfcWorkerEventFoundKeyA,
     NfcWorkerEventFoundKeyB,
 } NfcWorkerEvent;

lib/nfc/nfc_worker_i.h

@@ -13,7 +13,6 @@
 #include <lib/nfc/protocols/mifare_desfire.h>
 #include <lib/nfc/protocols/nfca.h>
 
-#include "helpers/mf_classic_dict.h"
 #include "helpers/nfc_debug_pcap.h"
 
 struct NfcWorker {
@@ -43,6 +42,6 @@ void nfc_worker_emulate_mf_ultralight(NfcWorker* nfc_worker);
 
 void nfc_worker_emulate_mf_classic(NfcWorker* nfc_worker);
 
-void nfc_worker_mf_classic_dict_attack(NfcWorker* nfc_worker, MfClassicDictType type);
+void nfc_worker_mf_classic_dict_attack(NfcWorker* nfc_worker);
 
 void nfc_worker_emulate_apdu(NfcWorker* nfc_worker);