93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
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from crypto.aes import AESdecryptCBC
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import struct
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"""
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iOS 4 keychain-2.db data column format
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version 0x00000000
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key class 0x00000008
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kSecAttrAccessibleWhenUnlocked 6
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kSecAttrAccessibleAfterFirstUnlock 7
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kSecAttrAccessibleAlways 8
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kSecAttrAccessibleWhenUnlockedThisDeviceOnly 9
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kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly 10
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kSecAttrAccessibleAlwaysThisDeviceOnly 11
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wrapped AES256 key 0x28 bytes (passed to kAppleKeyStoreKeyUnwrap)
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encrypted data (AES 256 CBC zero IV)
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"""
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from keychain import Keychain
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from crypto.gcm import gcm_decrypt
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from util.bplist import BPlistReader
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KSECATTRACCESSIBLE = {
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6: "kSecAttrAccessibleWhenUnlocked",
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7: "kSecAttrAccessibleAfterFirstUnlock",
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8: "kSecAttrAccessibleAlways",
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9: "kSecAttrAccessibleWhenUnlockedThisDeviceOnly",
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10: "kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly",
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11: "kSecAttrAccessibleAlwaysThisDeviceOnly"
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}
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class Keychain4(Keychain):
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def __init__(self, filename, keybag):
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if not keybag.unlocked:
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print "Keychain object created with locked keybag, some items won't be decrypted"
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Keychain.__init__(self, filename)
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self.keybag = keybag
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def decrypt_item(self, row):
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version, clas = struct.unpack("<LL", row["data"][0:8])
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if self.keybag.isBackupKeybag():
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if clas >= 9 and not self.keybag.deviceKey:
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return {}
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if version >= 2:
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dict = self.decrypt_blob(row["data"])
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if not dict:
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return {"clas": clas, "rowid": row["rowid"]}
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if dict.has_key("v_Data"):
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dict["data"] = dict["v_Data"].data
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else:
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dict["data"] = ""
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dict["rowid"] = row["rowid"]
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dict["clas"] = clas
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return dict
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row["clas"] = clas
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return Keychain.decrypt_item(self, row)
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def decrypt_data(self, data):
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data = self.decrypt_blob(data)
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if type(data) == dict:
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return data["v_Data"].data
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return data
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def decrypt_blob(self, blob):
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if blob == None:
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return ""
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if len(blob) < 48:
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print "keychain blob length must be >= 48"
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return
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version, clas = struct.unpack("<LL",blob[0:8])
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self.clas=clas
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if version == 0:
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wrappedkey = blob[8:8+40]
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encrypted_data = blob[48:]
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elif version == 2:
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l = struct.unpack("<L",blob[8:12])[0]
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wrappedkey = blob[12:12+l]
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encrypted_data = blob[12+l:-16]
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else:
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raise Exception("unknown keychain verson ", version)
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return
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unwrappedkey = self.keybag.unwrapKeyForClass(clas, wrappedkey, False)
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if not unwrappedkey:
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return
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if version == 0:
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return AESdecryptCBC(encrypted_data, unwrappedkey, padding=True)
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elif version == 2:
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binaryplist = gcm_decrypt(unwrappedkey, "", encrypted_data, "", blob[-16:])
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return BPlistReader(binaryplist).parse()
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