Intercept Desfire EV2 request with file not found

bettse · Jan 2, 2024 · 907b363 · 907b363
1 parent 6257bb3
commit 907b363
Showing 1 changed file with 16 additions and 7 deletions.
diff --git a/sam_api.c b/sam_api.c
@@ -22,6 +22,10 @@ uint8_t read4Block13[] = {RFAL_PICOPASS_CMD_READ4, 0x0D, 0x96, 0xE8};
 
 uint8_t updateBlock2[] = {RFAL_PICOPASS_CMD_UPDATE, 0x02};
 
+uint8_t ev2_request[] =
+    {0x00, 0xa4, 0x04, 0x00, 0x0a, 0xa0, 0x00, 0x00, 0x04, 0x40, 0x00, 0x01, 0x01, 0x00, 0x01, 0x00};
+uint8_t FILE_NOT_FOUND[] = {0x6a, 0x82};
+
 void* calloc(size_t count, size_t size) {
     return malloc(count * size);
 }
@@ -569,14 +573,19 @@ void seader_iso14443a_transmit(
     BitBuffer* rx_buffer = bit_buffer_alloc(SEADER_POLLER_MAX_BUFFER_SIZE);
 
     do {
-        bit_buffer_append_bytes(tx_buffer, buffer, len);
+        if(memcmp(buffer, ev2_request, len) == 0) {
+            bit_buffer_append_bytes(rx_buffer, FILE_NOT_FOUND, sizeof(FILE_NOT_FOUND));
 
-        Iso14443_4aError error =
-            iso14443_4a_poller_send_block(iso14443_4a_poller, tx_buffer, rx_buffer);
-        if(error != Iso14443_4aErrorNone) {
-            FURI_LOG_W(TAG, "iso14443_4a_poller_send_block error %d", error);
-            seader_worker->stage = SeaderPollerEventTypeFail;
-            break;
+        } else {
+            bit_buffer_append_bytes(tx_buffer, buffer, len);
+
+            Iso14443_4aError error =
+                iso14443_4a_poller_send_block(iso14443_4a_poller, tx_buffer, rx_buffer);
+            if(error != Iso14443_4aErrorNone) {
+                FURI_LOG_W(TAG, "iso14443_4a_poller_send_block error %d", error);
+                seader_worker->stage = SeaderPollerEventTypeFail;
+                break;
+            }
         }
 
         seader_capture_sio(tx_buffer, rx_buffer, seader->credential);