From 0d0f66bceaf8a2e7b2e51517ae4e83e07a246b45 Mon Sep 17 00:00:00 2001
From: Yukai Li <yukaili.geek@gmail.com>
Date: Thu, 13 Oct 2022 08:51:02 -0600
Subject: [PATCH] nfc: Attempt to authenticate with default PWD when possible
 when reading NTAG

---
 lib/nfc/protocols/mifare_ultralight.c | 17 +++++++++++++++++
 lib/nfc/protocols/mifare_ultralight.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/lib/nfc/protocols/mifare_ultralight.c b/lib/nfc/protocols/mifare_ultralight.c
index 4ea14b38c..0f97a8440 100644
--- a/lib/nfc/protocols/mifare_ultralight.c
+++ b/lib/nfc/protocols/mifare_ultralight.c
@@ -756,6 +756,23 @@ bool mf_ul_read_card(
             mf_ultralight_read_tearing_flags(tx_rx, data);
         }
         data->curr_authlim = 0;
+
+        if(reader->pages_read == reader->pages_to_read &&
+           reader->supported_features & MfUltralightSupportAuth) {
+            MfUltralightConfigPages* config = mf_ultralight_get_config_pages(data);
+            if(config->access.authlim == 0) {
+                // Attempt to auth with default PWD
+                uint16_t pack;
+                data->auth_success = mf_ultralight_authenticate(tx_rx, MF_UL_DEFAULT_PWD, &pack);
+                if(data->auth_success) {
+                    config->auth_data.pwd.value = MF_UL_DEFAULT_PWD;
+                    config->auth_data.pack.value = pack;
+                } else {
+                    furi_hal_nfc_sleep();
+                    furi_hal_nfc_activate_nfca(300, NULL);
+                }
+            }
+        }
     }
 
     if(reader->pages_read != reader->pages_to_read) {
diff --git a/lib/nfc/protocols/mifare_ultralight.h b/lib/nfc/protocols/mifare_ultralight.h
index fdd471ac1..c05a4a066 100644
--- a/lib/nfc/protocols/mifare_ultralight.h
+++ b/lib/nfc/protocols/mifare_ultralight.h
@@ -28,6 +28,8 @@
 
 #define MF_UL_NTAG203_COUNTER_PAGE (41)
 
+#define MF_UL_DEFAULT_PWD (0xFFFFFFFF)
+
 typedef enum {
     MfUltralightAuthMethodManual,
     MfUltralightAuthMethodAmeebo,