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Tool exodus2hashcat.py code cleanup
This commit is contained in:
Konrad Goławski
parent
7764666dd1
commit
232c6bac08
@ -1,65 +1,335 @@
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#!/usr/bin/env python
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#!/usr/bin/env python3
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# Author......: See docs/credits.txt
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# License.....: MIT
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# Target......: Exodus wallet extractor
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# Example.....: exodus2hashcat.py <path to exodus seed seco file>
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import binascii
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import sys
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from __future__ import annotations
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import hashlib
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from Crypto.Cipher import AES
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import base64
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import os.path
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import struct
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from argparse import ArgumentParser
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from base64 import b64encode
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from dataclasses import dataclass
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from enum import Enum
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from io import BytesIO
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from struct import Struct
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METADATA_LEN = 256
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HEADER_LEN = 224
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CRC_LEN = 32
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LEN_BLOB_STORED = 4
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if len(sys.argv) != 2 :
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print("Error, usage exodus2hashcat.py <path to exodus seed.seco file>")
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sys.exit(1)
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# consts
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with open(sys.argv[1],'rb') as fd:
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seedBuffer = fd.read()
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#Basic check
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if not seedBuffer[0:4].decode("utf8").startswith("SECO"):
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print("Not A SECO exodus header magic")
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sys.exit(1)
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SIGNATURE = "EXODUS"
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salt = seedBuffer[0x100:0x120]
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HEADER_MAGIC = b"SECO"
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HEADER_VERSION = 0
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HEADER_VERSION_TAG = b"seco-v0-scrypt-aes"
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HEADER_SIZE = 224
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n = int.from_bytes(seedBuffer[0x120:0x124],"big")
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r = int.from_bytes(seedBuffer[0x124:0x128],"big")
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p = int.from_bytes(seedBuffer[0x128:0x12c],"big")
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CHECKSUM_SIZE = 256 // 8
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#Basic check
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if n!=16384 or r !=8 or p != 1:
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print("Warning,unexpected scrypt N,r,p values")
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METADATA_SALT_SIZE = 32
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METADATA_CIPHER_SIZE = 32
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METADATA_BLOB_KEY_IV_SIZE = 12
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METADATA_BLOB_KEY_AUTH_TAG_SIZE = 16
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METADATA_BLOB_KEY_KEY_SIZE = 32
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METADATA_BLOB_IV_SIZE = 12
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METADATA_BLOB_AUTH_TAG_SIZE = 16
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METADATA_SIZE = 256
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if os.path.getsize(sys.argv[1]) != METADATA_LEN + HEADER_LEN + CRC_LEN + LEN_BLOB_STORED+ int.from_bytes(seedBuffer[0x200:0x204],"big"):
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print(os.path.getsize(sys.argv[1]))
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print( METADATA_LEN + HEADER_LEN + int.from_bytes(seedBuffer[0x200:0x204],"big"))
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print("Error file size")
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sys.argv[1]
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#Check integrity
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m = hashlib.sha256()
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m.update(seedBuffer[HEADER_LEN+CRC_LEN:])
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if m.digest() != seedBuffer[HEADER_LEN:HEADER_LEN+CRC_LEN]:
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print("SECO file seems corrupted")
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sys.exit(1)
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# structs
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#Check aes-gcm string
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cipher = seedBuffer[0x12c:0x138]
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if binascii.hexlify(cipher) != b"6165732d3235362d67636d00":
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print("Error aes-256-gcm")
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sys.exit(1)
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iv = seedBuffer[0x14c:0x158]
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authTag = seedBuffer[0x158:0x168]
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key = seedBuffer[0x168:0x188]
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@dataclass
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class File:
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header: Header
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checksum: bytes
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metadata: Metadata
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blob: bytes
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print("EXODUS:"+str(n)+":"+str(r)+":"+str(p)+":"+base64.b64encode(salt).decode("utf8")+":"+base64.b64encode(iv).decode("utf8")+":"+base64.b64encode(key).decode("utf8")+":"+base64.b64encode(authTag).decode("utf8"))
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@dataclass
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class Header:
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magic: bytes
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version: int
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version_tag: bytes
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app_name: bytes
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app_version: bytes
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@dataclass(init=False)
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class Metadata:
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class Cipher(str, Enum):
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AES_256_GCM = "aes-256-gcm"
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@dataclass
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class BlobKey:
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iv: bytes
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auth_tag: bytes
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key: bytes
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@dataclass
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class Blob:
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iv: bytes
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auth_tag: bytes
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salt: bytes
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n: int
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r: int
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p: int
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cipher: Cipher
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blob_key: BlobKey
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blob: Blob
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def __init__(self, salt, n, r, p, cipher, blob_key, blob):
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self.salt = salt
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self.n = n
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self.r = r
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self.p = p
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if isinstance(cipher, bytes):
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cipher = cipher.rstrip(b"\x00")
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cipher = cipher.decode()
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cipher = self.Cipher(cipher)
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self.cipher = cipher
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self.blob_key = blob_key
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self.blob = blob
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# header
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def read_header(file):
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# prepare structs
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partial_header_struct = Struct(">4sL4x")
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byte_struct = Struct(">B")
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# read whole header space
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file = BytesIO(file.read(HEADER_SIZE))
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# read partial header
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partial_header = file.read(partial_header_struct.size)
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if len(partial_header) < partial_header_struct.size:
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raise ValueError("file contains less data than needed")
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partial_header = partial_header_struct.unpack(partial_header)
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# read header version tag
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header_version_tag_length = file.read(byte_struct.size)
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if len(header_version_tag_length) < byte_struct.size:
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raise ValueError("file contains less data than needed")
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(header_version_tag_length,) = byte_struct.unpack(header_version_tag_length)
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header_version_tag = file.read(header_version_tag_length)
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if len(header_version_tag) < header_version_tag_length:
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raise ValueError("file contains less data than needed")
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# read header app name
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header_app_name_length = file.read(byte_struct.size)
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if len(header_app_name_length) < byte_struct.size:
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raise ValueError("file contains less data than needed")
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(header_app_name_length,) = byte_struct.unpack(header_app_name_length)
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header_app_name = file.read(header_app_name_length)
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if len(header_app_name) < header_app_name_length:
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raise ValueError("file contains less data than needed")
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# read header app version
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header_app_version_length = file.read(byte_struct.size)
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if len(header_app_version_length) < byte_struct.size:
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raise ValueError("file contains less data than needed")
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(header_app_version_length,) = byte_struct.unpack(header_app_version_length)
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header_app_version = file.read(header_app_version_length)
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if len(header_app_version) < header_app_version_length:
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raise ValueError("file contains less data than needed")
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# make header
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header = Header(*partial_header, header_version_tag, header_app_name, header_app_version)
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return header
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# checksum
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def read_checksum(file):
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# read checksum
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checksum = file.read(CHECKSUM_SIZE)
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if len(checksum) < CHECKSUM_SIZE:
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raise ValueError("file contains less data than needed")
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return checksum
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def validate_checksum(checksum, metadata, blob):
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# prepare hash
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sha256 = hashlib.sha256()
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# update with metadata
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sha256.update(metadata.salt)
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sha256.update(struct.pack(">LLL", metadata.n, metadata.r, metadata.p))
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sha256.update(metadata.cipher.value.encode().ljust(METADATA_CIPHER_SIZE, b"\x00"))
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# update with metadata blob key
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sha256.update(metadata.blob_key.iv)
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sha256.update(metadata.blob_key.auth_tag)
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sha256.update(metadata.blob_key.key)
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# update with metadata metadata.blob
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sha256.update(metadata.blob.iv)
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sha256.update(metadata.blob.auth_tag)
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# update with metadata padding
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metadata_size = (
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METADATA_SALT_SIZE
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+ struct.calcsize(">LLL")
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+ METADATA_CIPHER_SIZE
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+ METADATA_BLOB_KEY_IV_SIZE
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+ METADATA_BLOB_KEY_AUTH_TAG_SIZE
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+ METADATA_BLOB_KEY_KEY_SIZE
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+ METADATA_BLOB_IV_SIZE
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+ METADATA_BLOB_AUTH_TAG_SIZE
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)
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sha256.update(bytes(METADATA_SIZE - metadata_size))
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# update with blob
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sha256.update(struct.pack(">L", len(blob)))
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sha256.update(blob)
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# make digest
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digest = sha256.digest()
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# compare
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if checksum != digest:
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raise ValueError("file corrupted - checksum validation failed")
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# metadata
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def read_metadata(file):
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# prepare structs
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partial_metadata_struct = Struct(">" + str(METADATA_SALT_SIZE) + "sLLL" + str(METADATA_CIPHER_SIZE) + "s")
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blob_key_struct = Struct(
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">"
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+ str(METADATA_BLOB_KEY_IV_SIZE)
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+ "s"
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+ str(METADATA_BLOB_KEY_AUTH_TAG_SIZE)
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+ "s"
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+ str(METADATA_BLOB_KEY_KEY_SIZE)
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+ "s"
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)
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blob_struct = Struct(">" + str(METADATA_BLOB_IV_SIZE) + "s" + str(METADATA_BLOB_AUTH_TAG_SIZE) + "s")
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# read whole metadata space
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file = BytesIO(file.read(METADATA_SIZE))
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# read partial metadata
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partial_metadata = file.read(partial_metadata_struct.size)
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if len(partial_metadata) < partial_metadata_struct.size:
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raise ValueError("file contains less data than needed")
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partial_metadata = partial_metadata_struct.unpack(partial_metadata)
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# read blob key
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blob_key = file.read(blob_key_struct.size)
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if len(blob_key) < blob_key_struct.size:
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raise ValueError("file contains less data than needed")
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blob_key = blob_key_struct.unpack(blob_key)
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blob_key = Metadata.BlobKey(*blob_key)
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# read blob
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blob = file.read(blob_struct.size)
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if len(blob) < blob_struct.size:
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raise ValueError("file contains less data than needed")
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blob = blob_struct.unpack(blob)
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blob = Metadata.Blob(*blob)
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# make metadata
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metadata = Metadata(*partial_metadata, blob_key, blob)
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return metadata
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# blob
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def read_blob(file):
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# prepare structs
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size_struct = Struct(">L")
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# read size
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size = file.read(size_struct.size)
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if len(size) < size_struct.size:
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raise ValueError("file contains less data than needed")
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(size,) = size_struct.unpack(size)
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# read blob
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blob = file.read(size)
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if len(blob) < size:
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raise ValueError("file contains less data than needed")
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return blob
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# file
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def read_file(file):
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# read header
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header = read_header(file)
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# validate header values
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if header.magic != HEADER_MAGIC:
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raise ValueError("not a SECO file")
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if (header.version != HEADER_VERSION) or (header.version_tag != HEADER_VERSION_TAG):
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raise ValueError("unsupported version")
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# read checksum
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checksum = read_checksum(file)
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# read metadata
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metadata = read_metadata(file)
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# read blob
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blob = read_blob(file)
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# validate digest
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validate_checksum(checksum, metadata, blob)
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# make file
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file = File(header, checksum, metadata, blob)
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return file
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# main
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if __name__ == "__main__":
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# prepare parser and parse args
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parser = ArgumentParser(description="exodus2hashcat extraction tool")
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parser.add_argument("path", type=str, help="path to SECO file")
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args = parser.parse_args()
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try:
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with open(args.path, "rb") as file:
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file = read_file(file)
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hash = ":".join(
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map(
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str,
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[
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SIGNATURE,
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file.metadata.n,
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file.metadata.r,
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file.metadata.p,
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b64encode(file.metadata.salt).decode(),
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b64encode(file.metadata.blob_key.iv).decode(),
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b64encode(file.metadata.blob_key.key).decode(),
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b64encode(file.metadata.blob_key.auth_tag).decode(),
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],
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)
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)
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print(hash)
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except IOError as e:
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parser.error(e.strerror.lower())
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except ValueError as e:
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parser.error(str(e))
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