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"""
# Crypto SQL
# Copyright (c) 2011-2014 Michael Buesch <m@bues.ch>
# Licensed under the GNU/GPL version 2 or later.
"""
import sys
import os
import errno
import zlib
def missingMod(name, debpack):
print "Python '%s' module is not installed." % name
if debpack:
print "On Debian do: aptitude install %s" % debpack
sys.exit(1)
try:
import Crypto.Hash.SHA256 as SHA256
import Crypto.Hash.SHA512 as SHA512
import Crypto.Hash.HMAC as HMAC
from Crypto.Protocol.KDF import PBKDF2
import Crypto.Random
import Crypto.Cipher.AES as AES
except (ImportError), e:
missingMod("Crypto", "python-crypto")
try:
import sqlite3 as sql
except (ImportError), e:
missingMod("sqlite3", "python-sqlite")
CSQL_HEADER = map(lambda c: ord(c), "CryptSQL v1")
class CSQLError(Exception): pass
class FileObj(object):
# Raw object layout:
# [ 1 byte ] => Name length
# [ x bytes ] => Name
# [ 4 bytes ] => Payload data length
# [ x bytes ] => Payload data
def __init__(self, name, data):
self.name = self.__2str(name)
if len(self.name) > 0xFF:
raise CSQLError("FileObj: Name too long")
self.data = data
if len(self.data) > 0xFFFFFFFF:
raise CSQLError("FileObj: Data too long")
@staticmethod
def __2bytes(iterable):
if type(iterable) == str or type(iterable) == unicode:
iterable = map(lambda c: ord(c), iterable)
return iterable
@staticmethod
def __2str(iterable):
if type(iterable) != str:
iterable = "".join(map(lambda c: chr(c), iterable))
return iterable
def getName(self):
return self.name
def getData(self):
return self.data
def getDataString(self):
return self.__2str(self.data)
def getRaw(self):
name = self.__2bytes(self.name)
nameLen = len(name)
data = self.__2bytes(self.data)
dataLen = len(data)
r = [ nameLen & 0xFF, ]
r.extend(name)
r.extend( [
dataLen & 0xFF,
(dataLen >> 8) & 0xFF,
(dataLen >> 16) & 0xFF,
(dataLen >> 24) & 0xFF,
] )
r.extend(data)
return r
@staticmethod
def parseRaw(r):
try:
off = 0
nameLen = r[off]
off += 1
name = r[off : off + nameLen]
off += nameLen
dataLen = r[off] | (r[off + 1] << 8) |\
(r[off + 2] << 16) | (r[off + 3] << 24)
off += 4
data = r[off : off + dataLen]
off += dataLen
except (IndexError, KeyError), e:
raise CSQLError("Failed to parse file object")
return (FileObj(name, data), off)
class FileObjCollection(object):
def __init__(self, objects):
self.objects = objects
def getRaw(self):
r = []
for obj in self.objects:
r.extend(obj.getRaw())
return r
def get(self, name):
return filter(lambda o: o.name == name, self.objects)
def getOne(self, name, errorMsg=None):
objs = self.get(name)
if len(objs) != 1:
if errorMsg:
raise CSQLError(errorMsg)
return None
return objs[0]
@staticmethod
def parseRaw(r):
offset = 0
objects = []
while offset < len(r):
(obj, objLen) = FileObj.parseRaw(r[offset:])
objects.append(obj)
offset += objLen
return FileObjCollection(objects)
class CryptSQLCursor(object):
def __init__(self, c):
self.c = c
def sqlExec(self, code, params=[]):
self.c.execute(code, params)
return self
def sqlExecScript(self, code):
self.c.executescript(code)
return self
def fetchOne(self):
return self.c.fetchone()
def fetchAll(self):
return self.c.fetchall()
class CryptSQL(object):
def __init__(self):
self.__reset()
def __reset(self):
self.__rng = Crypto.Random.new()
self.db = None
self.filename = None
def __parseFileData(self, rawdata, passphrase):
fc = FileObjCollection.parseRaw(rawdata)
head = fc.getOne("HEAD", "Invalid file header object")
if head.getData() != CSQL_HEADER:
raise CSQLError("Invalid file header")
cipher = fc.getOne("CIPHER", "Invalid CYPHER object").getDataString()
cipherMode = fc.getOne("CIPHER_MODE", "Invalid CYPHER_MODE object").getDataString()
cipherIV = fc.getOne("CIPHER_IV")
if cipherIV:
cipherIV = cipherIV.getDataString()
keyLen = fc.getOne("KEY_LEN", "Invalid KEY_LEN object").getDataString()
kdfMethod = fc.getOne("KDF_METHOD", "Invalid KDF_METHOD object").getDataString()
kdfSalt = fc.getOne("KDF_SALT", "Invalid KDF_SALT object").getDataString()
kdfIter = fc.getOne("KDF_ITER", "Invalid KDF_ITER object").getDataString()
kdfHash = fc.getOne("KDF_HASH", "Invalid KDF_HASH object").getDataString()
kdfMac = fc.getOne("KDF_MAC", "Invalid KDF_MAC object").getDataString()
compress = fc.getOne("COMPRESS", "Invalid COMPRESS object").getDataString()
payload = fc.getOne("PAYLOAD", "Invalid PAYLOAD object").getDataString()
if cipher == "AES":
cipher = AES
else:
raise CSQLError("Unknown cipher: %s" % cipher)
if cipherMode == "CBC":
cipherMode = AES.MODE_CBC
else:
raise CSQLError("Unknown cipher mode: %s" % cipherMode)
if not cipherIV:
cipherIV = b'\x00' * cipher.block_size
if len(cipherIV) != cipher.block_size:
raise CSQLError("Invalid IV len: %d" % len(cipherIV))
if keyLen == "256":
keyLen = 256 // 8
else:
raise CSQLError("Unknown key len: %s" % keyLen)
if kdfMethod == "PBKDF2":
kdfMethod = PBKDF2
else:
raise CSQLError("Unknown kdf method: %s" % kdfMethod)
if len(kdfSalt) < 32:
raise CSQLError("Invalid salt len: %d" % len(kdfSalt))
try:
kdfIter = int(kdfIter, 10)
except (ValueError), e:
raise CSQLError("Unknown kdf-iter: %s" % kdfIter)
if kdfHash == "SHA256":
kdfHash = SHA256
elif kdfHash == "SHA512":
kdfHash = SHA512
else:
raise CSQLError("Unknown kdf-hash: %s" % kdfHash)
if kdfMac == "HMAC":
kdfMac = HMAC
else:
raise CSQLError("Unknown kdf-mac: %s" % kdfMac)
if compress == "ZLIB":
compress = zlib
else:
raise CSQLError("Unknown compression: %s" % compress)
try:
# Decrypt payload
prf = lambda p, s: kdfMac.new(p, s, kdfHash).digest()
key = kdfMethod(passphrase, kdfSalt, keyLen,
kdfIter, prf)
cipher = cipher.new(key, mode = cipherMode,
IV = cipherIV)
payload = cipher.decrypt(payload)
payload = self.__unpadData(payload)
# Decompress payload
payload = compress.decompress(payload)
# Import the SQL database
self.db.cursor().executescript(payload)
except (CSQLError, zlib.error, sql.Error), e:
raise CSQLError("Failed to decrypt database. "
"Wrong passphrase?")
def isOpen(self):
return bool(self.db)
def open(self, filename, passphrase):
if self.isOpen():
raise CSQLError("A database is already open")
self.__reset()
self.db = sql.connect(":memory:")
self.db.text_factory = str
try:
try:
rawdata = file(filename, "rb").read()
except (IOError), e:
if e.errno != errno.ENOENT:
raise CSQLError("Failed to read file: %s" %\
e.strerror)
else:
rawdata = map(lambda c: ord(c), rawdata)
self.__parseFileData(rawdata, passphrase)
except (CSQLError), e:
self.__reset()
raise
self.filename = filename
def close(self):
self.__reset()
@staticmethod
def __padData(data, align):
data += "\xFF"
nrPad = (align - (len(data) % align))
if nrPad != 0 and nrPad != align:
data += "\x00" * nrPad
return data
@staticmethod
def __unpadData(data):
index = data.rfind("\xFF")
if index < 0 or index >= len(data):
raise CSQLError("unpadData: error")
return data[:index]
def __random(self, nrBytes):
return self.__rng.read(nrBytes)
def commit(self, passphrase):
if not self.db or not self.filename:
raise CSQLError("Database is not open")
self.db.commit()
# Dump the database
payload = self.sqlPlainDump()
# Compress payload
payload = zlib.compress(payload, 1)
# Encrypt payload
kdfSalt = self.__random(34)
kdfIter = 40003
prf = lambda p, s: HMAC.new(p, s, SHA512).digest()
key = PBKDF2(passphrase, kdfSalt, 256 // 8,
kdfIter, prf)
cipherIV = self.__random(16)
aes = AES.new(key, mode = AES.MODE_CBC,
IV = cipherIV)
payload = aes.encrypt(self.__padData(payload, aes.block_size))
# Assemble file objects
fc = FileObjCollection(
(
FileObj("HEAD", CSQL_HEADER),
FileObj("CIPHER", "AES"),
FileObj("CIPHER_MODE", "CBC"),
FileObj("CIPHER_IV", cipherIV),
FileObj("KEY_LEN", "256"),
FileObj("KDF_METHOD", "PBKDF2"),
FileObj("KDF_SALT", kdfSalt),
FileObj("KDF_ITER", str(kdfIter)),
FileObj("KDF_HASH", "SHA512"),
FileObj("KDF_MAC", "HMAC"),
FileObj("COMPRESS", "ZLIB"),
FileObj("PAYLOAD", payload),
)
)
# Write to the file
rawdata = fc.getRaw()
try:
fd = file(self.filename, "wb")
fd.write("".join(map(lambda c: chr(c), rawdata)))
fd.flush()
fd.close()
except (IOError), e:
raise CSQLError("Failed to write file: %s" %\
e.strerror)
def sqlExec(self, code, params=[]):
return CryptSQLCursor(self.db.cursor()).sqlExec(code, params)
def sqlExecScript(self, code):
return CryptSQLCursor(self.db.cursor()).sqlExecScript(code)
def sqlCreateFunction(self, name, nrParams, func):
self.db.create_function(name, nrParams, func)
def sqlIsEmpty(self):
c = self.sqlExec("ANALYZE;")
tbl = c.sqlExec("SELECT tbl FROM sqlite_stat1;").fetchOne()
return not bool(tbl)
def sqlPlainDump(self):
return "\n".join(self.db.iterdump())
if __name__ == "__main__":
databaseFile = sys.argv[1]
passphrase = sys.argv[2]
csql = CryptSQL()
csql.open(databaseFile, passphrase)
csql.commit(passphrase)
csql.close()
|