overwrite buffers that may contain sensitive data
also reduce the amount of memory copying that we do
This commit is contained in:
Hubert Chathi
parent
357d4ff479
commit
5ef6a844d6
6 changed files with 235 additions and 127 deletions
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@ -3,6 +3,8 @@ all: olm-python2 olm-python3
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include/olm/olm.h: ../include/olm/olm.h ../include/olm/inbound_group_session.h ../include/olm/outbound_group_session.h
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mkdir -p include/olm
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$(CPP) -I dummy -I ../include ../include/olm/olm.h -o include/olm/olm.h
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# add memset to the header so that we can use it to clear buffers
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echo 'void *memset(void *s, int c, size_t n);' >> include/olm/olm.h
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olm-python2: include/olm/olm.h
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DEVELOP=$(DEVELOP) python2 setup.py build
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@ -26,6 +26,16 @@ except ImportError: # pragma: no cover
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URANDOM = urandom # type: ignore
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def to_bytearray(string):
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# type: (AnyStr) -> bytes
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if isinstance(string, bytes):
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return bytearray(string)
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elif isinstance(string, str):
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return bytearray(string, "utf-8")
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raise TypeError("Invalid type {}".format(type(string)))
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def to_bytes(string):
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# type: (AnyStr) -> bytes
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if isinstance(string, bytes):
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@ -37,7 +37,7 @@ from future.utils import bytes_to_native_str
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# pylint: disable=no-name-in-module
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from _libolm import ffi, lib # type: ignore
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from ._compat import URANDOM, to_bytes
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from ._compat import URANDOM, to_bytearray
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from ._finalize import track_for_finalization
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# This is imported only for type checking purposes
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@ -82,12 +82,12 @@ class Account(object):
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random_length = lib.olm_create_account_random_length(self._account)
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random = URANDOM(random_length)
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random_buffer = ffi.new("char[]", random)
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self._check_error(
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lib.olm_create_account(self._account, random_buffer,
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lib.olm_create_account(self._account, ffi.from_buffer(random),
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random_length))
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def _check_error(self, ret):
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# type: (int) -> None
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if ret != lib.olm_error():
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@ -111,15 +111,23 @@ class Account(object):
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passphrase(str, optional): The passphrase to be used to encrypt
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the account.
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"""
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byte_key = bytes(passphrase, "utf-8") if passphrase else b""
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key_buffer = ffi.new("char[]", byte_key)
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byte_key = bytearray(passphrase, "utf-8") if passphrase else b""
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pickle_length = lib.olm_pickle_account_length(self._account)
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pickle_buffer = ffi.new("char[]", pickle_length)
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try:
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self._check_error(
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lib.olm_pickle_account(self._account, key_buffer, len(byte_key),
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pickle_buffer, pickle_length))
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lib.olm_pickle_account(self._account,
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ffi.from_buffer(byte_key),
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len(byte_key),
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pickle_buffer,
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pickle_length))
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finally:
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# zero out copies of the passphrase
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for i in range(0, len(byte_key)):
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byte_key[i] = 0
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return ffi.unpack(pickle_buffer, pickle_length)
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@classmethod
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@ -143,15 +151,22 @@ class Account(object):
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if not pickle:
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raise ValueError("Pickle can't be empty")
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byte_key = bytes(passphrase, "utf-8") if passphrase else b""
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key_buffer = ffi.new("char[]", byte_key)
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byte_key = bytearray(passphrase, "utf-8") if passphrase else b""
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# copy because unpickle will destroy the buffer
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pickle_buffer = ffi.new("char[]", pickle)
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obj = cls.__new__(cls)
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ret = lib.olm_unpickle_account(obj._account, key_buffer, len(byte_key),
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pickle_buffer, len(pickle))
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try:
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ret = lib.olm_unpickle_account(obj._account,
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ffi.from_buffer(byte_key),
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len(byte_key),
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pickle_buffer,
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len(pickle))
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obj._check_error(ret)
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finally:
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for i in range(0, len(byte_key)):
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byte_key[i] = 0
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return obj
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@ -178,14 +193,21 @@ class Account(object):
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Args:
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message(str): The message to sign.
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"""
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bytes_message = to_bytes(message)
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bytes_message = to_bytearray(message)
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out_length = lib.olm_account_signature_length(self._account)
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message_buffer = ffi.new("char[]", bytes_message)
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out_buffer = ffi.new("char[]", out_length)
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try:
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self._check_error(
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lib.olm_account_sign(self._account, message_buffer,
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len(bytes_message), out_buffer, out_length))
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lib.olm_account_sign(self._account,
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ffi.from_buffer(bytes_message),
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len(bytes_message), out_buffer,
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out_length))
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finally:
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# clear out copies of the message, which may be plaintext
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if bytes_message is not message:
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for i in range(0, len(bytes_message)):
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bytes_message[i] = 0
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return bytes_to_native_str(ffi.unpack(out_buffer, out_length))
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@ -214,10 +236,10 @@ class Account(object):
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random_length = lib.olm_account_generate_one_time_keys_random_length(
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self._account, count)
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random = URANDOM(random_length)
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random_buffer = ffi.new("char[]", random)
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self._check_error(
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lib.olm_account_generate_one_time_keys(
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self._account, count, random_buffer, random_length))
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self._account, count, ffi.from_buffer(random), random_length))
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@property
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def one_time_keys(self):
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@ -33,7 +33,7 @@ from future.utils import bytes_to_native_str
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# pylint: disable=no-name-in-module
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from _libolm import ffi, lib # type: ignore
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from ._compat import URANDOM, to_bytes
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from ._compat import URANDOM, to_bytearray, to_bytes
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from ._finalize import track_for_finalization
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@ -78,12 +78,17 @@ class InboundGroupSession(object):
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if False: # pragma: no cover
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self._session = self._session # type: ffi.cdata
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byte_session_key = to_bytes(session_key)
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byte_session_key = to_bytearray(session_key)
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key_buffer = ffi.new("char[]", byte_session_key)
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try:
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ret = lib.olm_init_inbound_group_session(
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self._session, key_buffer, len(byte_session_key)
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self._session,
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ffi.from_buffer(byte_session_key), len(byte_session_key)
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)
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finally:
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if byte_session_key is not session_key:
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for i in range(0, len(byte_session_key)):
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byte_session_key[i] = 0
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self._check_error(ret)
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def pickle(self, passphrase=""):
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@ -98,19 +103,23 @@ class InboundGroupSession(object):
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passphrase(str, optional): The passphrase to be used to encrypt
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the session.
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"""
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byte_passphrase = bytes(passphrase, "utf-8") if passphrase else b""
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byte_passphrase = bytearray(passphrase, "utf-8") if passphrase else b""
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passphrase_buffer = ffi.new("char[]", byte_passphrase)
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pickle_length = lib.olm_pickle_inbound_group_session_length(
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self._session)
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pickle_buffer = ffi.new("char[]", pickle_length)
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try:
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ret = lib.olm_pickle_inbound_group_session(
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self._session, passphrase_buffer, len(byte_passphrase),
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self._session,
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ffi.from_buffer(byte_passphrase), len(byte_passphrase),
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pickle_buffer, pickle_length
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)
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self._check_error(ret)
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finally:
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# clear out copies of the passphrase
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for i in range(0, len(byte_passphrase)):
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byte_passphrase[i] = 0
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return ffi.unpack(pickle_buffer, pickle_length)
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@ -135,20 +144,25 @@ class InboundGroupSession(object):
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if not pickle:
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raise ValueError("Pickle can't be empty")
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byte_passphrase = bytes(passphrase, "utf-8") if passphrase else b""
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passphrase_buffer = ffi.new("char[]", byte_passphrase)
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byte_passphrase = bytearray(passphrase, "utf-8") if passphrase else b""
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# copy because unpickle will destroy the buffer
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pickle_buffer = ffi.new("char[]", pickle)
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obj = cls.__new__(cls)
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try:
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ret = lib.olm_unpickle_inbound_group_session(
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obj._session,
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passphrase_buffer,
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ffi.from_buffer(byte_passphrase),
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len(byte_passphrase),
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pickle_buffer,
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len(pickle)
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)
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obj._check_error(ret)
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finally:
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# clear out copies of the passphrase
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for i in range(0, len(byte_passphrase)):
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byte_passphrase[i] = 0
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return obj
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@ -189,12 +203,15 @@ class InboundGroupSession(object):
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byte_ciphertext = to_bytes(ciphertext)
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# copy because max_plaintext_length will destroy the buffer
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ciphertext_buffer = ffi.new("char[]", byte_ciphertext)
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max_plaintext_length = lib.olm_group_decrypt_max_plaintext_length(
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self._session, ciphertext_buffer, len(byte_ciphertext)
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)
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self._check_error(max_plaintext_length)
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plaintext_buffer = ffi.new("char[]", max_plaintext_length)
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# copy because max_plaintext_length will destroy the buffer
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ciphertext_buffer = ffi.new("char[]", byte_ciphertext)
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message_index = ffi.new("uint32_t*")
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@ -206,10 +223,15 @@ class InboundGroupSession(object):
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self._check_error(plaintext_length)
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return bytes_to_native_str(ffi.unpack(
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plaintext = bytes_to_native_str(ffi.unpack(
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plaintext_buffer,
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plaintext_length
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)), message_index[0]
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))
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# clear out copies of the plaintext
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lib.memset(plaintext_buffer, 0, max_plaintext_length)
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return plaintext, message_index[0]
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@property
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def id(self):
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@ -281,15 +303,19 @@ class InboundGroupSession(object):
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"""
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obj = cls.__new__(cls)
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byte_session_key = to_bytes(session_key)
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byte_session_key = to_bytearray(session_key)
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key_buffer = ffi.new("char[]", byte_session_key)
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try:
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ret = lib.olm_import_inbound_group_session(
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obj._session,
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key_buffer,
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ffi.from_buffer(byte_session_key),
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len(byte_session_key)
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)
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obj._check_error(ret)
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finally:
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if byte_session_key is not session_key:
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for i in range(0, len(byte_session_key)):
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byte_session_key[i] = 0
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return obj
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@ -323,10 +349,9 @@ class OutboundGroupSession(object):
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self._session
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)
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random = URANDOM(random_length)
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random_buffer = ffi.new("char[]", random)
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ret = lib.olm_init_outbound_group_session(
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self._session, random_buffer, random_length
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self._session, ffi.from_buffer(random), random_length
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)
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self._check_error(ret)
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@ -353,17 +378,23 @@ class OutboundGroupSession(object):
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passphrase(str, optional): The passphrase to be used to encrypt
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the session.
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"""
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byte_passphrase = bytes(passphrase, "utf-8") if passphrase else b""
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passphrase_buffer = ffi.new("char[]", byte_passphrase)
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byte_passphrase = bytearray(passphrase, "utf-8") if passphrase else b""
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pickle_length = lib.olm_pickle_outbound_group_session_length(
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self._session)
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pickle_buffer = ffi.new("char[]", pickle_length)
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try:
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ret = lib.olm_pickle_outbound_group_session(
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self._session, passphrase_buffer, len(byte_passphrase),
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self._session,
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ffi.from_buffer(byte_passphrase), len(byte_passphrase),
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pickle_buffer, pickle_length
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)
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self._check_error(ret)
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finally:
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# clear out copies of the passphrase
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for i in range(0, len(byte_passphrase)):
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byte_passphrase[i] = 0
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return ffi.unpack(pickle_buffer, pickle_length)
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@classmethod
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@ -387,20 +418,25 @@ class OutboundGroupSession(object):
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if not pickle:
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raise ValueError("Pickle can't be empty")
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byte_passphrase = bytes(passphrase, "utf-8") if passphrase else b""
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passphrase_buffer = ffi.new("char[]", byte_passphrase)
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byte_passphrase = bytearray(passphrase, "utf-8") if passphrase else b""
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# copy because unpickle will destroy the buffer
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pickle_buffer = ffi.new("char[]", pickle)
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obj = cls.__new__(cls)
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try:
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ret = lib.olm_unpickle_outbound_group_session(
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obj._session,
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passphrase_buffer,
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ffi.from_buffer(byte_passphrase),
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len(byte_passphrase),
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pickle_buffer,
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len(pickle)
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)
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obj._check_error(ret)
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finally:
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# clear out copies of the passphrase
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for i in range(0, len(byte_passphrase)):
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byte_passphrase[i] = 0
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return obj
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@ -414,21 +450,26 @@ class OutboundGroupSession(object):
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plaintext(str): A string that will be encrypted using the group
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session.
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"""
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byte_plaintext = to_bytes(plaintext)
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byte_plaintext = to_bytearray(plaintext)
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message_length = lib.olm_group_encrypt_message_length(
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self._session, len(byte_plaintext)
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)
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message_buffer = ffi.new("char[]", message_length)
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plaintext_buffer = ffi.new("char[]", byte_plaintext)
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try:
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ret = lib.olm_group_encrypt(
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self._session,
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plaintext_buffer, len(byte_plaintext),
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ffi.from_buffer(byte_plaintext), len(byte_plaintext),
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message_buffer, message_length,
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)
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self._check_error(ret)
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finally:
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# clear out copies of plaintext
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if byte_plaintext is not plaintext:
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for i in range(0, len(byte_plaintext)):
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byte_plaintext[i] = 0
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return bytes_to_native_str(ffi.unpack(message_buffer, message_length))
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@property
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|
|
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@ -40,7 +40,7 @@ from future.utils import bytes_to_native_str
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# pylint: disable=no-name-in-module
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from _libolm import ffi, lib # type: ignore
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from ._compat import URANDOM, to_bytes
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from ._compat import URANDOM, to_bytearray, to_bytes
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from ._finalize import track_for_finalization
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# This is imported only for type checking purposes
|
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|
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@ -164,15 +164,22 @@ class Session(object):
|
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passphrase(str, optional): The passphrase to be used to encrypt
|
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the session.
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"""
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byte_key = bytes(passphrase, "utf-8") if passphrase else b""
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key_buffer = ffi.new("char[]", byte_key)
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byte_key = bytearray(passphrase, "utf-8") if passphrase else b""
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pickle_length = lib.olm_pickle_session_length(self._session)
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pickle_buffer = ffi.new("char[]", pickle_length)
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try:
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self._check_error(
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lib.olm_pickle_session(self._session, key_buffer, len(byte_key),
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lib.olm_pickle_session(self._session,
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ffi.from_buffer(byte_key),
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len(byte_key),
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pickle_buffer, pickle_length))
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finally:
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# clear out copies of the passphrase
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for i in range(0, len(byte_key)):
|
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byte_key[i] = 0
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return ffi.unpack(pickle_buffer, pickle_length)
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@classmethod
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|
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@ -196,16 +203,23 @@ class Session(object):
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if not pickle:
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raise ValueError("Pickle can't be empty")
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|
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byte_key = bytes(passphrase, "utf-8") if passphrase else b""
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key_buffer = ffi.new("char[]", byte_key)
|
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byte_key = bytearray(passphrase, "utf-8") if passphrase else b""
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# copy because unpickle will destroy the buffer
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pickle_buffer = ffi.new("char[]", pickle)
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session = cls.__new__(cls)
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ret = lib.olm_unpickle_session(session._session, key_buffer,
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len(byte_key), pickle_buffer,
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try:
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ret = lib.olm_unpickle_session(session._session,
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ffi.from_buffer(byte_key),
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len(byte_key),
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pickle_buffer,
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len(pickle))
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session._check_error(ret)
|
||||
finally:
|
||||
# clear out copies of the passphrase
|
||||
for i in range(0, len(byte_key)):
|
||||
byte_key[i] = 0
|
||||
|
||||
return session
|
||||
|
||||
|
|
@ -217,29 +231,32 @@ class Session(object):
|
|||
Args:
|
||||
plaintext(str): The plaintext message that will be encrypted.
|
||||
"""
|
||||
byte_plaintext = to_bytes(plaintext)
|
||||
byte_plaintext = to_bytearray(plaintext)
|
||||
|
||||
r_length = lib.olm_encrypt_random_length(self._session)
|
||||
random = URANDOM(r_length)
|
||||
random_buffer = ffi.new("char[]", random)
|
||||
|
||||
try:
|
||||
message_type = lib.olm_encrypt_message_type(self._session)
|
||||
|
||||
self._check_error(message_type)
|
||||
|
||||
ciphertext_length = lib.olm_encrypt_message_length(
|
||||
self._session, len(plaintext)
|
||||
self._session, len(byte_plaintext)
|
||||
)
|
||||
ciphertext_buffer = ffi.new("char[]", ciphertext_length)
|
||||
|
||||
plaintext_buffer = ffi.new("char[]", byte_plaintext)
|
||||
|
||||
self._check_error(lib.olm_encrypt(
|
||||
self._session,
|
||||
plaintext_buffer, len(byte_plaintext),
|
||||
random_buffer, r_length,
|
||||
ffi.from_buffer(byte_plaintext), len(byte_plaintext),
|
||||
ffi.from_buffer(random), r_length,
|
||||
ciphertext_buffer, ciphertext_length,
|
||||
))
|
||||
finally:
|
||||
# clear out copies of plaintext
|
||||
if byte_plaintext is not plaintext:
|
||||
for i in range(0, len(byte_plaintext)):
|
||||
byte_plaintext[i] = 0
|
||||
|
||||
if message_type == lib.OLM_MESSAGE_TYPE_PRE_KEY:
|
||||
return OlmPreKeyMessage(
|
||||
|
|
@ -274,22 +291,34 @@ class Session(object):
|
|||
raise ValueError("Ciphertext can't be empty")
|
||||
|
||||
byte_ciphertext = to_bytes(message.ciphertext)
|
||||
# make a copy the ciphertext buffer, because
|
||||
# olm_decrypt_max_plaintext_length wants to destroy something
|
||||
ciphertext_buffer = ffi.new("char[]", byte_ciphertext)
|
||||
|
||||
max_plaintext_length = lib.olm_decrypt_max_plaintext_length(
|
||||
self._session, message.message_type, ciphertext_buffer,
|
||||
len(byte_ciphertext)
|
||||
)
|
||||
self._check_error(max_plaintext_length)
|
||||
plaintext_buffer = ffi.new("char[]", max_plaintext_length)
|
||||
|
||||
# make a copy the ciphertext buffer, because
|
||||
# olm_decrypt_max_plaintext_length wants to destroy something
|
||||
ciphertext_buffer = ffi.new("char[]", byte_ciphertext)
|
||||
plaintext_length = lib.olm_decrypt(
|
||||
self._session, message.message_type, ciphertext_buffer,
|
||||
len(byte_ciphertext), plaintext_buffer, max_plaintext_length
|
||||
self._session, message.message_type,
|
||||
ciphertext_buffer, len(byte_ciphertext),
|
||||
plaintext_buffer, max_plaintext_length
|
||||
)
|
||||
self._check_error(plaintext_length)
|
||||
return bytes_to_native_str(
|
||||
plaintext = bytes_to_native_str(
|
||||
ffi.unpack(plaintext_buffer, plaintext_length))
|
||||
|
||||
# clear out copies of the plaintext
|
||||
lib.memset(plaintext_buffer, 0, max_plaintext_length)
|
||||
|
||||
return plaintext
|
||||
|
||||
@property
|
||||
def id(self):
|
||||
# type: () -> str
|
||||
|
|
@ -331,16 +360,16 @@ class Session(object):
|
|||
ret = None
|
||||
|
||||
byte_ciphertext = to_bytes(message.ciphertext)
|
||||
|
||||
# make a copy, because olm_matches_inbound_session(_from) will distroy
|
||||
# it
|
||||
message_buffer = ffi.new("char[]", byte_ciphertext)
|
||||
|
||||
if identity_key:
|
||||
byte_id_key = to_bytes(identity_key)
|
||||
identity_key_buffer = ffi.new("char[]", byte_id_key)
|
||||
|
||||
ret = lib.olm_matches_inbound_session_from(
|
||||
self._session,
|
||||
identity_key_buffer, len(byte_id_key),
|
||||
ffi.from_buffer(byte_id_key), len(byte_id_key),
|
||||
message_buffer, len(byte_ciphertext)
|
||||
)
|
||||
|
||||
|
|
@ -447,14 +476,11 @@ class OutboundSession(Session):
|
|||
self._session)
|
||||
|
||||
random = URANDOM(session_random_length)
|
||||
random_buffer = ffi.new("char[]", random)
|
||||
identity_key_buffer = ffi.new("char[]", byte_id_key)
|
||||
one_time_key_buffer = ffi.new("char[]", byte_one_time)
|
||||
|
||||
self._check_error(lib.olm_create_outbound_session(
|
||||
self._session,
|
||||
account._account,
|
||||
identity_key_buffer, len(byte_id_key),
|
||||
one_time_key_buffer, len(byte_one_time),
|
||||
random_buffer, session_random_length
|
||||
ffi.from_buffer(byte_id_key), len(byte_id_key),
|
||||
ffi.from_buffer(byte_one_time), len(byte_one_time),
|
||||
ffi.from_buffer(random), session_random_length
|
||||
))
|
||||
|
|
|
|||
|
|
@ -36,7 +36,7 @@ from typing import AnyStr, Type
|
|||
# pylint: disable=no-name-in-module
|
||||
from _libolm import ffi, lib # type: ignore
|
||||
|
||||
from ._compat import to_bytes
|
||||
from ._compat import to_bytearray, to_bytes
|
||||
from ._finalize import track_for_finalization
|
||||
|
||||
|
||||
|
|
@ -80,13 +80,20 @@ class _Utility(object):
|
|||
cls._allocate()
|
||||
|
||||
byte_key = to_bytes(key)
|
||||
byte_message = to_bytes(message)
|
||||
byte_message = to_bytearray(message)
|
||||
byte_signature = to_bytes(signature)
|
||||
|
||||
try:
|
||||
cls._check_error(
|
||||
lib.olm_ed25519_verify(cls._utility, byte_key, len(byte_key),
|
||||
byte_message, len(byte_message),
|
||||
ffi.from_buffer(byte_message),
|
||||
len(byte_message),
|
||||
byte_signature, len(byte_signature)))
|
||||
finally:
|
||||
# clear out copies of the message, which may be a plaintext
|
||||
if byte_message is not message:
|
||||
for i in range(0, len(byte_message)):
|
||||
byte_message[i] = 0
|
||||
|
||||
|
||||
def ed25519_verify(key, message, signature):
|
||||
|
|
|
|||
Loading…
Reference in a new issue