Python wrapper: support for inbound group sessions
This commit is contained in:
Richard van der Hoff
parent
fc4756ddf1
commit
846ab858a6
4 changed files with 162 additions and 7 deletions
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@ -1,3 +1,4 @@
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from .account import Account
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from .session import Session
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from .outbound_group_session import OutboundGroupSession
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from .inbound_group_session import InboundGroupSession
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@ -210,14 +210,43 @@ def build_arg_parser():
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outbound_group.add_argument("session_file", help="Local group session file")
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outbound_group.set_defaults(func=do_outbound_group)
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group_credentials = commands.add_parser("group_credentials", help="Export the current outbound group session credentials")
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group_credentials.add_argument("session_file", help="Local outbound group session file")
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group_credentials.add_argument("credentials_file", help="File to write credentials to (default stdout)",
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type=argparse.FileType('w'), nargs='?',
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default=sys.stdout)
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group_credentials.set_defaults(func=do_group_credentials)
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group_encrypt = commands.add_parser("group_encrypt", help="Encrypt a group message")
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group_encrypt.add_argument("session_file", help="Local group session file")
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group_encrypt.add_argument("plaintext_file", help="Plaintext",
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type=argparse.FileType('rb'), default=sys.stdin)
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group_encrypt.add_argument("message_file", help="Message",
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type=argparse.FileType('wb'), default=sys.stdout)
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group_encrypt.add_argument("session_file", help="Local outbound group session file")
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group_encrypt.add_argument("plaintext_file", help="Plaintext file (default stdin)",
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type=argparse.FileType('rb'), nargs='?',
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default=sys.stdin)
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group_encrypt.add_argument("message_file", help="Message file (default stdout)",
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type=argparse.FileType('w'), nargs='?',
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default=sys.stdout)
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group_encrypt.set_defaults(func=do_group_encrypt)
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inbound_group = commands.add_parser(
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"inbound_group",
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help=("Create an inbound group session based on credentials from an "+
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"outbound group session"))
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inbound_group.add_argument("session_file", help="Local inbound group session file")
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inbound_group.add_argument("credentials_file",
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help="File to read credentials from (default stdin)",
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type=argparse.FileType('r'), nargs='?',
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default=sys.stdin)
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inbound_group.set_defaults(func=do_inbound_group)
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group_decrypt = commands.add_parser("group_decrypt", help="Decrypt a group message")
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group_decrypt.add_argument("session_file", help="Local inbound group session file")
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group_decrypt.add_argument("message_file", help="Message file (default stdin)",
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type=argparse.FileType('r'), nargs='?',
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default=sys.stdin)
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group_decrypt.add_argument("plaintext_file", help="Plaintext file (default stdout)",
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type=argparse.FileType('wb'), nargs='?',
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default=sys.stdout)
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group_decrypt.set_defaults(func=do_group_decrypt)
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return parser
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def do_outbound_group(args):
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@ -240,6 +269,43 @@ def do_group_encrypt(args):
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f.write(session.pickle(args.key))
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args.message_file.write(message)
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def do_group_credentials(args):
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session = OutboundGroupSession()
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with open(args.session_file, "rb") as f:
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session.unpickle(args.key, f.read())
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result = {
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'message_index': session.message_index(),
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'session_key': session.session_key(),
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}
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json.dump(result, args.credentials_file, indent=4)
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def do_inbound_group(args):
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if os.path.exists(args.session_file):
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sys.stderr.write("Session %r file already exists\n" % (
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args.session_file,
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))
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sys.exit(1)
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credentials = json.load(args.credentials_file)
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for k in ('message_index', 'session_key'):
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if not k in credentials:
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sys.stderr.write("Credentials file is missing %s\n" % k)
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sys.exit(1);
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session = InboundGroupSession()
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session.init(credentials['message_index'], credentials['session_key'])
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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def do_group_decrypt(args):
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session = InboundGroupSession()
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with open(args.session_file, "rb") as f:
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session.unpickle(args.key, f.read())
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message = args.message_file.read()
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plaintext = session.decrypt(message)
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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args.plaintext_file.write(plaintext)
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if __name__ == '__main__':
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parser = build_arg_parser()
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args = parser.parse_args()
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86
python/olm/inbound_group_session.py
Normal file
86
python/olm/inbound_group_session.py
Normal file
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@ -0,0 +1,86 @@
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import json
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from ._base import *
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lib.olm_inbound_group_session_size.argtypes = []
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lib.olm_inbound_group_session_size.restype = c_size_t
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lib.olm_inbound_group_session.argtypes = [c_void_p]
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lib.olm_inbound_group_session.restype = c_void_p
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lib.olm_inbound_group_session_last_error.argtypes = [c_void_p]
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lib.olm_inbound_group_session_last_error.restype = c_char_p
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def inbound_group_session_errcheck(res, func, args):
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if res == ERR:
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raise OlmError("%s: %s" % (
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func.__name__, lib.olm_inbound_group_session_last_error(args[0])
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))
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return res
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def inbound_group_session_function(func, *types):
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func.argtypes = (c_void_p,) + types
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func.restypes = c_size_t
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func.errcheck = inbound_group_session_errcheck
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inbound_group_session_function(
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lib.olm_pickle_inbound_group_session, c_void_p, c_size_t, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_unpickle_inbound_group_session, c_void_p, c_size_t, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_init_inbound_group_session, c_uint32, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_group_decrypt_max_plaintext_length, c_void_p, c_size_t
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)
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inbound_group_session_function(
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lib.olm_group_decrypt,
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c_void_p, c_size_t, # message
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c_void_p, c_size_t, # plaintext
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)
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class InboundGroupSession(object):
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def __init__(self):
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self.buf = create_string_buffer(lib.olm_inbound_group_session_size())
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self.ptr = lib.olm_inbound_group_session(self.buf)
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def pickle(self, key):
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key_buffer = create_string_buffer(key)
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pickle_length = lib.olm_pickle_inbound_group_session_length(self.ptr)
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pickle_buffer = create_string_buffer(pickle_length)
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lib.olm_pickle_inbound_group_session(
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self.ptr, key_buffer, len(key), pickle_buffer, pickle_length
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)
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return pickle_buffer.raw
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def unpickle(self, key, pickle):
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key_buffer = create_string_buffer(key)
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pickle_buffer = create_string_buffer(pickle)
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lib.olm_unpickle_inbound_group_session(
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self.ptr, key_buffer, len(key), pickle_buffer, len(pickle)
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)
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def init(self, message_index, session_key):
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key_buffer = create_string_buffer(session_key)
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lib.olm_init_inbound_group_session(
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self.ptr, message_index, key_buffer, len(session_key)
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)
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def decrypt(self, message):
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message_buffer = create_string_buffer(message)
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max_plaintext_length = lib.olm_group_decrypt_max_plaintext_length(
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self.ptr, message_buffer, len(message)
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)
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plaintext_buffer = create_string_buffer(max_plaintext_length)
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message_buffer = create_string_buffer(message)
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plaintext_length = lib.olm_group_decrypt(
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self.ptr, message_buffer, len(message),
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plaintext_buffer, max_plaintext_length
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)
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return plaintext_buffer.raw[:plaintext_length]
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@ -7,10 +7,11 @@ ALICE_SESSION=alice.session
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ALICE_GROUP_SESSION=alice.group_session
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BOB_ACCOUNT=bob.account
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BOB_SESSION=bob.session
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BOB_GROUP_SESSION=bob.group_session
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rm $ALICE_ACCOUNT $BOB_ACCOUNT
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rm $ALICE_SESSION $BOB_SESSION
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rm $ALICE_GROUP_SESSION
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rm $ALICE_GROUP_SESSION $BOB_GROUP_SESSION
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$OLM create_account $ALICE_ACCOUNT
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$OLM create_account $BOB_ACCOUNT
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@ -27,4 +28,5 @@ echo "Hello world" | $OLM encrypt $ALICE_SESSION - - | $OLM inbound $BOB_ACCOUNT
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### group sessions
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$OLM outbound_group $ALICE_GROUP_SESSION
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echo "Hello world" | $OLM group_encrypt $ALICE_GROUP_SESSION - -
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$OLM group_credentials $ALICE_GROUP_SESSION | $OLM inbound_group $BOB_GROUP_SESSION
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echo "Hello group" | $OLM group_encrypt $ALICE_GROUP_SESSION - - | $OLM group_decrypt $BOB_GROUP_SESSION
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