headless fixes (pr3y#107), added some serial cmds (pr3y#64), initial …

…encrypted files support (pr3y#123)

platformio.ini

@@ -30,8 +30,16 @@ build_flags =
 	-DEEPROMSIZE=128
 	-DLH=8
 	-DLW=6
-	-DCONFIG_FILE='"/config.conf"'
+	-DCONFIG_FILE='"/bruce.conf"'
 	-w
+	!echo '-DGIT_COMMIT_HASH=\\"'$(git describe --always --dirty)'\\"'
+	; rtl_433_ESP flags https://github.com/NorthernMan54/rtl_433_ESP/blob/main/example/OOK_Receiver/platformio.ini
+	;-DOOK_MODULATION=true      ; False is FSK, True is OOK
+	;-DRF_CC1101="CC1101"
+	;-DRF_MODULE_GDO0=9   ; CC1101 pin GDO0
+	;-DRF_MODULE_GDO2=14    ; CC1101 pin GDO2
+	;-DRF_MODULE_GDO2=RADIOLIB_NC    ; CC1101 pin GDO2
+	;-DRF_MODULE_INIT_STATUS=true
 
 lib_deps = 
 	WireGuard-ESP32
@@ -53,6 +61,7 @@ lib_deps =
 	;lsatan/SmartRC-CC1101-Driver-Lib@^2.5.7
 	SmartRC-CC1101-Driver-Lib=https://github.com/bmorcelli/SmartRC-CC1101-Driver-Lib/archive/refs/heads/Bruce.zip
 	h2zero/NimBLE-Arduino@^1.4.0
+	;https://github.com/eadmaster/rtl_433_ESP
 
 [env:m5stack-cplus2]
 platform = espressif32
@@ -320,14 +329,14 @@ build_flags =
 	;Radio Frequency (one pin modules) pin setting
 	-DRF_TX_PINS='{ {"M5 RF433T", GROVE_SDA}, {"Groove W", GROVE_SCL}, {"GROVE Y", GROVE_SDA}}'
 	-DRF_RX_PINS='{ {"M5 RF433R", GROVE_SCL}, {"Groove W", GROVE_SCL}, {"GROVE Y", GROVE_SDA}}'
-    ; connection pins using microSD sniffer module https://www.sparkfun.com/products/9419 https://docs.m5stack.com/en/core/Cardputer
-    -DUSE_CC1101_VIA_SPI
-    -DCC1101_GDO0_PIN=GROVE_SDA
-    -DCC1101_SS_PIN=GROVE_SCL  ; chip select
-    -DCC1101_MOSI_PIN=14
-    -DCC1101_SCK_PIN=40
-    -DCC1101_MISO_PIN=39
-    ;-DCC1101_GDO2_PIN=-1
+	; connection pins using microSD sniffer module https://www.sparkfun.com/products/9419 https://docs.m5stack.com/en/core/Cardputer
+	-DUSE_CC1101_VIA_SPI
+	-DCC1101_GDO0_PIN=GROVE_SDA  ; 2
+	-DCC1101_SS_PIN=GROVE_SCL  ; 1 = chip select
+	-DCC1101_MOSI_PIN=14  ; CMD on SDsniffer
+	-DCC1101_SCK_PIN=40   ; CLK on SDsniffer
+	-DCC1101_MISO_PIN=39  ; DAT0 on SDsniffer
+	;-DCC1101_GDO2_PIN=-1
 
 	;Screen Setup
 	-DHAS_SCREEN=1
@@ -741,7 +750,7 @@ build_flags =
 	; grove pins
 	; defaults from https://github.com/espressif/arduino-esp32/blob/master/variants/esp32s3/pins_arduino.h
 	-DGROVE_SDA=8  ; default RF TX pin
-	-DGROVE_SCL=9  ; default IR/RF RX pin
+	-DGROVE_SCL=46  ; default IR/RF RX pin
 	;-DALLOW_ALL_GPIO_FOR_IR_RF=1 ; Set this option to make use of all GPIOs, from 1 to 44 to be chosen, except TFT and SD pins
 
 	; ir led pin

src/core/globals.h

@@ -109,6 +109,8 @@ extern int RfModule;
 
 extern float RfFreq;
 
+extern String cachedPassword;
+
 // Screen sleep control variables
 extern unsigned long previousMillis;
 extern bool isSleeping;

src/core/passwords.cpp

@@ -0,0 +1,38 @@
+#include "mbedtls/aes.h"
+#include "mbedtls/md.h"
+#include "mbedtls/pkcs5.h"
+#include <Arduino.h>
+
+
+String aes_decrypt(uint8_t* inputData, size_t fileSize, const String& password_str) {
+    // generate key, iv, salt
+    const char *password = password_str.c_str();
+    unsigned char key[32];
+    unsigned char iv[16];
+    unsigned char salt[8] = { /* The salt used by OpenSSL during encryption */ };
+
+    mbedtls_md_context_t md_ctx;
+    mbedtls_md_init(&md_ctx);
+    mbedtls_md_setup(&md_ctx, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 1);
+
+    // Derive key and IV using PBKDF2
+    mbedtls_pkcs5_pbkdf2_hmac(&md_ctx, (unsigned char*)password, strlen(password), salt, 8, 10000, 32, key);
+    mbedtls_pkcs5_pbkdf2_hmac(&md_ctx, (unsigned char*)password, strlen(password), salt, 8, 10000, 16, iv);
+
+    mbedtls_md_free(&md_ctx);
+
+    unsigned char *outputData = new unsigned char[fileSize];
+    mbedtls_aes_context aes;
+    mbedtls_aes_init(&aes);
+    mbedtls_aes_setkey_dec(&aes, key, 256);
+
+    mbedtls_aes_crypt_cbc(&aes, MBEDTLS_AES_DECRYPT, fileSize, iv, inputData, outputData);
+
+    mbedtls_aes_free(&aes);
+
+    // Convert the decrypted data to a string
+    String decryptedText = String(outputData, fileSize);
+    free(outputData);
+
+    return decryptedText;
+}

src/core/passwords.h

@@ -0,0 +1,2 @@
+
+String aes_decrypt(uint8_t* inputData, size_t fileSize, const String& password_str);

src/core/sd_functions.cpp

@@ -3,10 +3,12 @@
 #include "sd_functions.h"
 #include "mykeyboard.h"   // usinf keyboard when calling rename
 #include "display.h"      // using displayRedStripe as error msg
+#include "passwords.h"
 #include "modules/others/audio.h"
 #include "modules/rf/rf.h"
 #include "modules/ir/TV-B-Gone.h"
 #include "modules/others/bad_usb.h"
+#include "modules/others/qrcode_menu.h"
 
 struct FilePage {
   int pageIndex;
@@ -284,6 +286,111 @@ String readLineFromFile(File myFile) {
   return line;
 }
 
+
+/***************************************************************************************
+** Function name: readSmallFile
+** Description:   read a small (<3KB) file and return its contents as a single string
+**                on any error returns an empty string
+***************************************************************************************/
+String readSmallFile(FS &fs, String filepath) {
+  String fileContent = "";
+  File file;
+
+  file = fs.open(filepath, FILE_READ);
+  if (!file) return "";
+
+  size_t fileSize = file.size();
+  if(fileSize > 1024*3) {  // 3K is the max
+      displayError("File is too big");
+      Serial.println("File is too big");
+      return "";
+  }
+
+  fileContent = file.readString();
+
+  file.close();
+  return fileContent;
+}
+
+/***************************************************************************************
+** Function name: getFileSize
+** Description:   get a file size without opening
+***************************************************************************************/
+size_t getFileSize(FS &fs, String filepath) {
+    if(&fs == &SD) filepath = "/sd" + filepath; 
+    else if(&fs == &LittleFS) filepath = "/littlefs" + filepath; 
+    else return 0;  // not found
+    struct stat st;
+    memset(&st, 0, sizeof(struct stat));
+    if (stat(filepath.c_str(), &st) != 0) return 0;  // stat error
+    // else
+    return st.st_size;
+}
+
+bool is_valid_ascii(const String &text) {
+    for (int i = 0; i < text.length(); i++) {
+        char c = text[i];
+        // Check if the character is within the printable ASCII range or is a newline/carriage return
+        if (!(c >= 32 && c <= 126) && c != 10 && c != 13) {
+            return false; // Invalid character found
+        }
+    }
+    return true; // All characters are valid
+}
+
+String readDecryptedAesFile(FS &fs, String filepath) {
+  File file;
+
+  file = fs.open(filepath, FILE_READ);
+  if (!file) return "";
+
+  size_t fileSize = file.size();
+  if(fileSize > 1024*3) {  // 3K is the max
+      displayError("File is too big");
+      return "";
+  }
+
+  char buffer[fileSize];
+  size_t bytesRead = file.readBytes(buffer, fileSize);
+  //Serial.print("fileSize:");
+  //Serial.println(fileSize);
+  //Serial.println(bytesRead);
+
+  /*
+  // read the whole file with a single call
+  char buffer[fileSize + 1];
+  size_t bytesRead = file.readBytes(buffer, fileSize);
+  buffer[bytesRead] = '\0'; // Null-terminate the string
+  return String(buffer);
+  */
+
+  if (bytesRead==0) {
+    Serial.println("empty cypherText");
+    return "";
+  }
+  // else
+
+  if(cachedPassword.length()==0) {
+    cachedPassword = keyboard("", 32, "password");
+    if(cachedPassword.length()==0) return "";  // cancelled
+  }
+
+  // else try to decrypt
+  String plaintext = aes_decrypt((uint8_t*)buffer, bytesRead, cachedPassword);
+
+  // check if really plaintext
+  if(!is_valid_ascii(plaintext)) {
+    // invalidate cached password -> will ask again on the next try
+    cachedPassword = "";
+    Serial.println("invalid password");
+    Serial.println(plaintext);
+    return "";
+  }
+  // else
+  return plaintext;
+}
+
+
 /***************************************************************************************
 ** Function name: sortList
 ** Description:   sort files for name
@@ -434,16 +541,14 @@ String loopSD(FS &fs, bool filePicker, String allowed_ext) {
   closeSdCard();
   setupSdCard();
   bool exit = false;
+  returnToMenu=true;  // make sure menu is redrawn when quitting in any point
 
   readFs(fs, Folder, fileList, allowed_ext);
 
   for(int i=0; i<MAXFILES; i++) if(fileList[i][2]!="") maxFiles++; else break;
   while(1){
     //if(returnToMenu) break; // stop this loop and retur to the previous loop
-    if(exit){ 
-      returnToMenu=true;
-      break; // stop this loop and retur to the previous loop
-    } 
+    if(exit) break; // stop this loop and retur to the previous loop
 
     if(redraw) {
       if(strcmp(PreFolder.c_str(),Folder.c_str()) != 0 || reload){
@@ -539,20 +644,53 @@ String loopSD(FS &fs, bool filePicker, String allowed_ext) {
               txSubFile(&fs, filepath);
             }});
           #if defined(USB_as_HID)
-          if(filepath.endsWith(".txt")) options.insert(options.begin(), {"BadUSB Run",  [&]() { 
-              Kb.begin();
-              USB.begin();
+          if(filepath.endsWith(".txt")) {
+            options.push_back({"BadUSB Run",  [&]() { 
+              Kb.begin(); USB.begin(); 
+              // TODO: set default keyboard layout
               key_input(fs, filepath);
             }});
+            /*
+            options.push_back({"USB HID Type",  [&]() { 
+              Kb.begin(); USB.begin();
+              Kb.print(readSmallFile(fs, filepath).c_str());  // buggy?
+              //String t = readSmallFile(fs, filepath).c_str();
+              //Kb.write((const uint8_t*) t.c_str(), t.length());
+            }});*/
+          }
+          if(filepath.endsWith(".aes") || filepath.endsWith(".enc")) {  // aes encrypted files
+              options.insert(options.begin(), {"Decrypt+Type",  [&]() { 
+                  String plaintext = readDecryptedAesFile(fs, filepath);
+                  if(plaintext.length()==0) return displayError("invalid password");;  // file is too big or cannot read, or cancelled
+                  // else
+                  Kb.begin(); USB.begin();
+                  Kb.print(plaintext.c_str());
+              }});
+          }
           #endif
+          if(filepath.endsWith(".aes") || filepath.endsWith(".enc")) {  // aes encrypted files
+              options.insert(options.begin(), {"Decrypt+Show",  [&]() {
+                String plaintext = readDecryptedAesFile(fs, filepath);
+                if(plaintext.length()==0) return;  // file is too big or cannot read, or cancelled
+                // else
+                displaySuccess(plaintext);
+                delay(2000);
+                // TODO: loop and wait for user input?
+              }});
+          }
           #if defined(HAS_NS4168_SPKR)
           if(isAudioFile(filepath)) options.insert(options.begin(), {"Play Audio",  [&]() { 
             delay(200);
             playAudioFile(&fs, filepath);
             setup_gpio(); //TODO: remove after fix select loop
           }});
           #endif
-
+          // generate qr codes from small files (<10K)
+          size_t filesize = getFileSize(fs, filepath);  // TODO: check filesize without opening
+          if(filesize < 3*1024) options.push_back({"QR code",  [&]() { 
+              delay(200);
+              qrcode_display(readSmallFile(fs, filepath));
+            }});
           options.push_back({"Main Menu", [&]() { exit = true; }});
           delay(200);
           if(!filePicker) loopOptions(options);
@@ -740,4 +878,4 @@ bool checkLittleFsSizeNM() {
   if((LittleFS.totalBytes() - LittleFS.usedBytes()) < 4096) {
     return false;
   } else return true;
-}
+}

src/core/sd_functions.h

@@ -27,6 +27,10 @@ bool createFolder(FS fs, String path);
 
 String readLineFromFile(File myFile);
 
+String readSmallFile(FS &fs, String filepath);
+
+String readDecryptedAesFile(FS &fs, String filepath);
+
 void readFs(FS fs, String folder, String result[][3], String allowed_ext = "*");
 
 void sortList(String fileList[][3], int fileListCount);
@@ -39,4 +43,4 @@ int createFilePages(String fileContent);
 
 bool checkLittleFsSize();
 
-bool checkLittleFsSizeNM(); //Don't display msg
+bool checkLittleFsSizeNM(); //Don't display msg