def _createContext(self, encrypt):
context = m2.cipher_ctx_new()
if len(self.key)==16:
cipherType = m2.aes_128_cbc()
elif len(self.key)==24:
cipherType = m2.aes_192_cbc()
elif len(self.key)==32:
cipherType = m2.aes_256_cbc()
else:
raise AssertionError("Key is bad size: %s" % len(self.key))
m2.cipher_init(context, cipherType, self.key, self.IV, encrypt)
return context
def main():
q = LockboxOrderedDict()
observer = Observer()
observer.schedule(CleartextEventHandler(q, cleartext_dir, ciphertext_dir), path=cleartext_dir, recursive=True)
observer.schedule(CiphertextEventHandler(q, cleartext_dir, ciphertext_dir), path=ciphertext_dir, recursive=True)
observer.start()
try:
while True:
time.sleep(1)
try:
while True:
(stem, deets) = q.first() #just read, don't pop here because we need it to stay in the OrderedDict in case another event comes in on this file before we're done
logger.debug('%s %s', stem, deets)
if not deets['collided']:
check_for_collided_after_operation = False
if deets['action'] == 'encrypt':
logger.debug('encrypting from %s to %s', deets['cleartext_full_path'], deets['ciphertext_full_path'])
check_for_collided_after_operation = True
target_path = deets['ciphertext_full_path']
(tmp_fd, tmp_path) = tempfile.mkstemp()
os.close(tmp_fd)
rio = BIO.openfile(deets['cleartext_full_path'], 'rb')
rio.write_close()
wrio = BIO.openfile(tmp_path, 'wb')
cf = BIO.CipherStream(wrio)
salt = Rand.rand_pseudo_bytes(8)[0]
logger.debug("salt=%s",ByteToHex(salt))
passphrase_f = open(os.path.join(deets['config_dir_path'], 'key.txt'), 'r') ## TODO cache this
passphrase = passphrase_f.readline().rstrip()
passphrase_f.close()
(key, iv) = m2.bytes_to_key(m2.aes_256_cbc(), m2.md5(), passphrase, salt, 1)
logger.debug("key=%s", ByteToHex(key))
logger.debug("iv=%s", ByteToHex(iv))
cf.set_cipher('aes_256_cbc', key, iv, 1)
wrio.write('Salted__') # magic - see openssl's enc.c
wrio.write(salt)
while True:
out = rio.read(4096)
if not out:
break
cf.write(out)
cf.flush()
cf.write_close()
cf.close()
wrio.flush()
wrio.write_close()
wrio.close()
elif deets['action'] == 'decrypt':
logger.debug('decrypting from %s to %s', deets['ciphertext_full_path'], deets['cleartext_full_path'])
check_for_collided_after_operation = True
target_path = deets['cleartext_full_path']
(tmp_fd, tmp_path) = tempfile.mkstemp()
os.close(tmp_fd)
## TODO: handle failure of decryption
rio = BIO.openfile(deets['ciphertext_full_path'], 'rb')
rio.write_close()
wrio = BIO.openfile(deets['cleartext_full_path'], 'wb')
cf = BIO.CipherStream(wrio)
header = rio.read(size=len('Salted__'))
if header != 'Salted__':
print "uh, this doesn't look like an encrypted file"
exit()
salt = rio.read(size=8)
logger.debug("salt=%s",ByteToHex(salt))
passphrase_f = open(os.path.join(deets['config_dir_path'], 'key.txt'), 'r') ## TODO cache this
passphrase = passphrase_f.readline().rstrip()
passphrase_f.close()
(key, iv) = m2.bytes_to_key(m2.aes_256_cbc(), m2.md5(), passphrase, salt, 1)
logger.debug("key=%s", ByteToHex(key))
logger.debug("iv=%s", ByteToHex(iv))
cf.set_cipher('aes_256_cbc', key, iv, 0)
while True:
out = rio.read(4096)
if not out:
break
cf.write(out)
cf.flush()
cf.write_close()
cf.close()
wrio.flush()
wrio.write_close()
wrio.close()
elif deets['action'] == 'delete-cipher':
logger.debug('deleting %s', deets['ciphertext_full_path'])
if os.path.exists(deets['ciphertext_full_path']):
os.unlink(deets['ciphertext_full_path'])
elif deets['action'] == 'delete-clear':
logger.debug('deleting %s', deets['cleartext_full_path'])
if os.path.exists(deets['cleartext_full_path']):
os.unlink(deets['cleartext_full_path'])
else:
logger.error('Unknown action %s on %s', deets['action'], deets)
time.sleep(0) ## http://stackoverflow.com/questions/787803/how-does-a-threading-thread-yield-the-rest-of-its-quantum-in-python
(stem, deets) = q.popitem(False)
if check_for_collided_after_operation:
## now, if it got marked as collided in the interim while we were encrypting/decrypting then we don't want to overwrite
if not deets['collided']:
## move from temp location to real location
if platform.system() == 'Windows':
## TODO: this can throw an exception on windows if the target_place is locked. need to think about how to deal with this
if os.path.exists(target_path):
logger.debug('windows only: unlink %s', target_path)
os.unlink(target_path)
logger.debug('rename %s to %s', tmp_path, target_path)
mkdir_p(os.path.dirname(target_path))
os.rename(tmp_path, target_path)
else:
## TODO: if it was a decrypt, move the newly decrypted file to stem-from-dropbox-collision
## if it was an encrypt, immediately decrypt ciphertext version to stem-from-dropbox-collision
## TODO: delete tmp_path in the case that we're no longer using it (it was an encrypt that we no longer can copy to the ciphertext location)
pass
else:
(stem, deets) = q.popitem(False)
if deets['action'] in ('delete-clear','delete-cipher'):
logger.error('should not get a collided delete because they should be removed from the queue in our OrderedDict subclass')
else:
## TODO: immediately decrypt and put it into stem-from-dropbox-collision
pass
except StopIteration:
#print "nada"
pass
except KeyboardInterrupt:
pass
observer.stop()
observer.join()
return ''.join( bytes )
rio = BIO.openfile(os.path.expanduser('~/Lockbox/foobar/firsttest.txt'), 'rb')
rio.write_close()
wrio = BIO.openfile(os.path.expanduser('~/Dropbox/LOCKBOX-foobar/firsttest.txt'), 'wb')
cf = BIO.CipherStream(wrio)
salt = Rand.rand_pseudo_bytes(8)[0]
#salt = '\x00\x00\x00\x00\x00\x00\x00\x00'
print "salt=%s" % ByteToHex(salt)
passphrase = 'foo bar'
(key, iv) = m2.bytes_to_key(m2.aes_256_cbc(), m2.md5(), passphrase, salt, 1)
print "key=%s" % ByteToHex(key)
print "iv=%s" % ByteToHex(iv)
cf.set_cipher('aes_256_cbc', key, iv, 1)
wrio.write('Salted__') # magic - see openssl's enc.c
wrio.write(salt)
while True:
out = rio.read(4096)
if not out:
break
cf.write(out)