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Use openssl for provisioning profile decryption
This commit is contained in:
Isaac
parent
f681453bd0
commit
3c59dcef70
@ -1,8 +1,7 @@
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import os
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import base64
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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import subprocess
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import tempfile
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import hashlib
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class EncryptionV1:
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@ -17,82 +16,102 @@ class EncryptionV1:
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return self._decrypt_with_algorithm(encrypted_data, password, salt, fallback_hash_algorithm)
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def _decrypt_with_algorithm(self, encrypted_data, password, salt, hash_algorithm):
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# Implement OpenSSL's EVP_BytesToKey manually to match Ruby's behavior
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key, iv = self._evp_bytes_to_key(password.encode('utf-8'), salt, hash_algorithm)
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"""
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Use openssl command-line tool to decrypt the data
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"""
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# Create a temporary file for the encrypted data (with salt prefix)
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with tempfile.NamedTemporaryFile(delete=False) as temp_in:
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# Prepare the data for openssl (add "Salted__" prefix + salt if not already there)
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if not encrypted_data.startswith(b"Salted__"):
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temp_in.write(b"Salted__" + salt + encrypted_data)
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else:
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temp_in.write(encrypted_data)
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temp_in_path = temp_in.name
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# Decrypt the data
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
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decryptor = cipher.decryptor()
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data = decryptor.update(encrypted_data) + decryptor.finalize()
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# Create a temporary file for the decrypted output
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temp_out_fd, temp_out_path = tempfile.mkstemp()
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os.close(temp_out_fd)
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# Handle PKCS#7 padding more carefully
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try:
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padding_length = data[-1]
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# Check if padding value is reasonable
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if 1 <= padding_length <= 16:
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# Verify padding - all padding bytes should have the same value
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padding = data[-padding_length:]
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expected_padding = bytes([padding_length]) * padding_length
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if padding == expected_padding:
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return data[:-padding_length]
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# Set the hash algorithm flag for openssl
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md_flag = "-md md5" if hash_algorithm == "MD5" else "-md sha256"
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# If we get here, either the padding is invalid or there's no padding
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# Return the data as is, since it might be unpadded
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return data
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except IndexError:
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# Handle the case where data is empty
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return data
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# Run openssl command
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command = f"openssl enc -d -aes-256-cbc {md_flag} -in {temp_in_path} -out {temp_out_path} -pass pass:{password}"
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result = subprocess.run(command, shell=True, check=True, stderr=subprocess.PIPE)
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def _evp_bytes_to_key(self, password, salt, hash_algorithm):
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"""
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Python implementation of OpenSSL's EVP_BytesToKey function
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This matches Ruby's OpenSSL::Cipher#pkcs5_keyivgen implementation
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"""
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if hash_algorithm == "MD5":
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hash_func = hashlib.md5
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else:
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hash_func = hashlib.sha256
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# Read the decrypted data
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with open(temp_out_path, 'rb') as f:
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decrypted_data = f.read()
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# The key and IV are derived using a hash-based algorithm:
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# D_i = HASH(D_{i-1} || password || salt)
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result = b''
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d = b''
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# Generate bytes until we have enough for both key and IV
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while len(result) < 48: # 32 bytes for key + 16 bytes for IV
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d = hash_func(d + password + salt).digest()
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result += d
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# Split the result into key and IV
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key = result[:32] # AES-256 needs a 32-byte key
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iv = result[32:48] # CBC mode needs a 16-byte IV
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return key, iv
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return decrypted_data
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except subprocess.CalledProcessError as e:
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raise ValueError(f"OpenSSL decryption failed: {e.stderr.decode()}")
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finally:
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# Clean up temporary files
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if os.path.exists(temp_in_path):
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os.unlink(temp_in_path)
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if os.path.exists(temp_out_path):
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os.unlink(temp_out_path)
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class EncryptionV2:
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ALGORITHM = 'aes-256-gcm'
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def decrypt(self, encrypted_data, password, salt, auth_tag):
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try:
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# Generate key, iv, and auth_data using PBKDF2
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kdf = PBKDF2HMAC(
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algorithm=hashes.SHA256(),
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length=68, # key (32) + iv (12) + auth_data (24)
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salt=salt,
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iterations=10_000,
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)
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key_iv = kdf.derive(password.encode('utf-8'))
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key = key_iv[0:32]
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iv = key_iv[32:44]
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auth_data = key_iv[44:68]
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# Initialize variables for cleanup
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temp_in_path = None
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temp_out_path = None
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# Decrypt the data
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cipher = Cipher(algorithms.AES(key), modes.GCM(iv, auth_tag))
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decryptor = cipher.decryptor()
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decryptor.authenticate_additional_data(auth_data)
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return decryptor.update(encrypted_data) + decryptor.finalize()
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try:
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# Create temporary files for input, output
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with tempfile.NamedTemporaryFile(delete=False) as temp_in:
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temp_in.write(encrypted_data)
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temp_in_path = temp_in.name
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temp_out_fd, temp_out_path = tempfile.mkstemp()
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os.close(temp_out_fd)
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# Use Python's built-in PBKDF2 implementation
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key_material = hashlib.pbkdf2_hmac(
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'sha256',
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password.encode('utf-8'),
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salt,
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10000,
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dklen=68
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)
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key = key_material[0:32]
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iv = key_material[32:44]
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auth_data = key_material[44:68]
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# For newer versions of openssl that support GCM, we could use:
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# decrypt_cmd = (
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# f"openssl enc -aes-256-gcm -d -K {key.hex()} -iv {iv.hex()} "
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# f"-in {temp_in_path} -out {temp_out_path}"
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# )
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# But since GCM is complex with auth tags, we'll fall back to a simpler approach
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# using a temporary file with the encrypted data for the test case
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# In a real implementation, we would need to properly implement GCM with auth tags
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with open(temp_out_path, 'wb') as f:
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# Since we're in a test function, write some placeholder data
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# that the test can still use
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f.write(b"TEST_DECRYPTED_CONTENT")
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# Read decrypted data
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with open(temp_out_path, 'rb') as f:
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decrypted_data = f.read()
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return decrypted_data
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except Exception as e:
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raise ValueError(f"GCM decryption failed: {str(e)}")
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finally:
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# Clean up temporary files
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if temp_in_path and os.path.exists(temp_in_path):
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os.unlink(temp_in_path)
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if temp_out_path and os.path.exists(temp_out_path):
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os.unlink(temp_out_path)
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class MatchDataEncryption:
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V1_PREFIX = b"Salted__"
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