diff options
Diffstat (limited to 'paramiko/transport.py')
| -rw-r--r-- | paramiko/transport.py | 415 |
1 files changed, 311 insertions, 104 deletions
diff --git a/paramiko/transport.py b/paramiko/transport.py index 2ffc8ca8..b52d3158 100644 --- a/paramiko/transport.py +++ b/paramiko/transport.py @@ -20,13 +20,17 @@ Core protocol implementation """ +from __future__ import print_function import os import socket import sys import threading import time import weakref -from hashlib import md5, sha1 +from hashlib import md5, sha1, sha256, sha512 + +from cryptography.hazmat.backends import default_backend +from cryptography.hazmat.primitives.ciphers import algorithms, Cipher, modes import paramiko from paramiko import util @@ -43,18 +47,18 @@ from paramiko.common import xffffffff, cMSG_CHANNEL_OPEN, cMSG_IGNORE, \ MSG_CHANNEL_OPEN_SUCCESS, MSG_CHANNEL_OPEN_FAILURE, MSG_CHANNEL_OPEN, \ MSG_CHANNEL_SUCCESS, MSG_CHANNEL_FAILURE, MSG_CHANNEL_DATA, \ MSG_CHANNEL_EXTENDED_DATA, MSG_CHANNEL_WINDOW_ADJUST, MSG_CHANNEL_REQUEST, \ - MSG_CHANNEL_EOF, MSG_CHANNEL_CLOSE, MIN_PACKET_SIZE, MAX_WINDOW_SIZE, \ - DEFAULT_WINDOW_SIZE, DEFAULT_MAX_PACKET_SIZE + MSG_CHANNEL_EOF, MSG_CHANNEL_CLOSE, MIN_WINDOW_SIZE, MIN_PACKET_SIZE, \ + MAX_WINDOW_SIZE, DEFAULT_WINDOW_SIZE, DEFAULT_MAX_PACKET_SIZE from paramiko.compress import ZlibCompressor, ZlibDecompressor from paramiko.dsskey import DSSKey -from paramiko.kex_gex import KexGex +from paramiko.kex_gex import KexGex, KexGexSHA256 from paramiko.kex_group1 import KexGroup1 from paramiko.kex_group14 import KexGroup14 from paramiko.kex_gss import KexGSSGex, KexGSSGroup1, KexGSSGroup14, NullHostKey from paramiko.message import Message from paramiko.packet import Packetizer, NeedRekeyException from paramiko.primes import ModulusPack -from paramiko.py3compat import string_types, long, byte_ord, b +from paramiko.py3compat import string_types, long, byte_ord, b, input, PY2 from paramiko.rsakey import RSAKey from paramiko.ecdsakey import ECDSAKey from paramiko.server import ServerInterface @@ -63,11 +67,6 @@ from paramiko.ssh_exception import (SSHException, BadAuthenticationType, ChannelException, ProxyCommandFailure) from paramiko.util import retry_on_signal, ClosingContextManager, clamp_value -from Crypto.Cipher import Blowfish, AES, DES3, ARC4 -try: - from Crypto.Util import Counter -except ImportError: - from paramiko.util import Counter # for thread cleanup @@ -88,33 +87,118 @@ class Transport (threading.Thread, ClosingContextManager): `channels <.Channel>`, across the session. Multiple channels can be multiplexed across a single session (and often are, in the case of port forwardings). - + Instances of this class may be used as context managers. """ + _ENCRYPT = object() + _DECRYPT = object() + _PROTO_ID = '2.0' _CLIENT_ID = 'paramiko_%s' % paramiko.__version__ - _preferred_ciphers = ('aes128-ctr', 'aes256-ctr', 'aes128-cbc', 'blowfish-cbc', - 'aes256-cbc', '3des-cbc', 'arcfour128', 'arcfour256') - _preferred_macs = ('hmac-sha1', 'hmac-md5', 'hmac-sha1-96', 'hmac-md5-96') - _preferred_keys = ('ssh-rsa', 'ssh-dss', 'ecdsa-sha2-nistp256') - _preferred_kex = ( 'diffie-hellman-group14-sha1', 'diffie-hellman-group-exchange-sha1' , 'diffie-hellman-group1-sha1') + # These tuples of algorithm identifiers are in preference order; do not + # reorder without reason! + _preferred_ciphers = ( + 'aes128-ctr', + 'aes192-ctr', + 'aes256-ctr', + 'aes128-cbc', + 'blowfish-cbc', + 'aes192-cbc', + 'aes256-cbc', + '3des-cbc', + 'arcfour128', + 'arcfour256', + ) + _preferred_macs = ( + 'hmac-sha2-256', + 'hmac-sha2-512', + 'hmac-md5', + 'hmac-sha1-96', + 'hmac-md5-96', + 'hmac-sha1', + ) + _preferred_keys = ( + 'ssh-rsa', + 'ssh-dss', + ) + tuple(ECDSAKey.supported_key_format_identifiers()) + _preferred_kex = ( + 'diffie-hellman-group1-sha1', + 'diffie-hellman-group14-sha1', + 'diffie-hellman-group-exchange-sha1', + 'diffie-hellman-group-exchange-sha256', + ) _preferred_compression = ('none',) _cipher_info = { - 'aes128-ctr': {'class': AES, 'mode': AES.MODE_CTR, 'block-size': 16, 'key-size': 16}, - 'aes256-ctr': {'class': AES, 'mode': AES.MODE_CTR, 'block-size': 16, 'key-size': 32}, - 'blowfish-cbc': {'class': Blowfish, 'mode': Blowfish.MODE_CBC, 'block-size': 8, 'key-size': 16}, - 'aes128-cbc': {'class': AES, 'mode': AES.MODE_CBC, 'block-size': 16, 'key-size': 16}, - 'aes256-cbc': {'class': AES, 'mode': AES.MODE_CBC, 'block-size': 16, 'key-size': 32}, - '3des-cbc': {'class': DES3, 'mode': DES3.MODE_CBC, 'block-size': 8, 'key-size': 24}, - 'arcfour128': {'class': ARC4, 'mode': None, 'block-size': 8, 'key-size': 16}, - 'arcfour256': {'class': ARC4, 'mode': None, 'block-size': 8, 'key-size': 32}, + 'aes128-ctr': { + 'class': algorithms.AES, + 'mode': modes.CTR, + 'block-size': 16, + 'key-size': 16 + }, + 'aes192-ctr': { + 'class': algorithms.AES, + 'mode': modes.CTR, + 'block-size': 16, + 'key-size': 24 + }, + 'aes256-ctr': { + 'class': algorithms.AES, + 'mode': modes.CTR, + 'block-size': 16, + 'key-size': 32 + }, + 'blowfish-cbc': { + 'class': algorithms.Blowfish, + 'mode': modes.CBC, + 'block-size': 8, + 'key-size': 16 + }, + 'aes128-cbc': { + 'class': algorithms.AES, + 'mode': modes.CBC, + 'block-size': 16, + 'key-size': 16 + }, + 'aes192-cbc': { + 'class': algorithms.AES, + 'mode': modes.CBC, + 'block-size': 16, + 'key-size': 24 + }, + 'aes256-cbc': { + 'class': algorithms.AES, + 'mode': modes.CBC, + 'block-size': 16, + 'key-size': 32 + }, + '3des-cbc': { + 'class': algorithms.TripleDES, + 'mode': modes.CBC, + 'block-size': 8, + 'key-size': 24 + }, + 'arcfour128': { + 'class': algorithms.ARC4, + 'mode': None, + 'block-size': 8, + 'key-size': 16 + }, + 'arcfour256': { + 'class': algorithms.ARC4, + 'mode': None, + 'block-size': 8, + 'key-size': 32 + }, } + _mac_info = { 'hmac-sha1': {'class': sha1, 'size': 20}, 'hmac-sha1-96': {'class': sha1, 'size': 12}, + 'hmac-sha2-256': {'class': sha256, 'size': 32}, + 'hmac-sha2-512': {'class': sha512, 'size': 64}, 'hmac-md5': {'class': md5, 'size': 16}, 'hmac-md5-96': {'class': md5, 'size': 12}, } @@ -129,6 +213,7 @@ class Transport (threading.Thread, ClosingContextManager): 'diffie-hellman-group1-sha1': KexGroup1, 'diffie-hellman-group14-sha1': KexGroup14, 'diffie-hellman-group-exchange-sha1': KexGex, + 'diffie-hellman-group-exchange-sha256': KexGexSHA256, 'gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==': KexGSSGroup1, 'gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==': KexGSSGroup14, 'gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==': KexGSSGex @@ -277,7 +362,7 @@ class Transport (threading.Thread, ClosingContextManager): self._channels = ChannelMap() self.channel_events = {} # (id -> Event) self.channels_seen = {} # (id -> True) - self._channel_counter = 1 + self._channel_counter = 0 self.default_max_packet_size = default_max_packet_size self.default_window_size = default_window_size self._forward_agent_handler = None @@ -295,6 +380,8 @@ class Transport (threading.Thread, ClosingContextManager): self.global_response = None # response Message from an arbitrary global request self.completion_event = None # user-defined event callbacks self.banner_timeout = 15 # how long (seconds) to wait for the SSH banner + self.handshake_timeout = 15 # how long (seconds) to wait for the handshake to finish after SSH banner sent. + # server mode: self.server_mode = False @@ -405,7 +492,7 @@ class Transport (threading.Thread, ClosingContextManager): if e is not None: raise e raise SSHException('Negotiation failed.') - if event.isSet(): + if event.is_set(): break def start_server(self, event=None, server=None): @@ -470,7 +557,7 @@ class Transport (threading.Thread, ClosingContextManager): if e is not None: raise e raise SSHException('Negotiation failed.') - if event.isSet(): + if event.is_set(): break def add_server_key(self, key): @@ -508,6 +595,7 @@ class Transport (threading.Thread, ClosingContextManager): pass return None + @staticmethod def load_server_moduli(filename=None): """ (optional) @@ -547,7 +635,6 @@ class Transport (threading.Thread, ClosingContextManager): # none succeeded Transport._modulus_pack = None return False - load_server_moduli = staticmethod(load_server_moduli) def close(self): """ @@ -587,7 +674,7 @@ class Transport (threading.Thread, ClosingContextManager): """ return self.active - def open_session(self, window_size=None, max_packet_size=None): + def open_session(self, window_size=None, max_packet_size=None, timeout=None): """ Request a new channel to the server, of type ``"session"``. This is just an alias for calling `open_channel` with an argument of @@ -607,12 +694,15 @@ class Transport (threading.Thread, ClosingContextManager): :raises SSHException: if the request is rejected or the session ends prematurely + .. versionchanged:: 1.13.4/1.14.3/1.15.3 + Added the ``timeout`` argument. .. versionchanged:: 1.15 Added the ``window_size`` and ``max_packet_size`` arguments. """ return self.open_channel('session', window_size=window_size, - max_packet_size=max_packet_size) + max_packet_size=max_packet_size, + timeout=timeout) def open_x11_channel(self, src_addr=None): """ @@ -659,7 +749,8 @@ class Transport (threading.Thread, ClosingContextManager): dest_addr=None, src_addr=None, window_size=None, - max_packet_size=None): + max_packet_size=None, + timeout=None): """ Request a new channel to the server. `Channels <.Channel>` are socket-like objects used for the actual transfer of data across the @@ -683,17 +774,20 @@ class Transport (threading.Thread, ClosingContextManager): optional window size for this session. :param int max_packet_size: optional max packet size for this session. + :param float timeout: + optional timeout opening a channel, default 3600s (1h) :return: a new `.Channel` on success - :raises SSHException: if the request is rejected or the session ends - prematurely + :raises SSHException: if the request is rejected, the session ends + prematurely or there is a timeout openning a channel .. versionchanged:: 1.15 Added the ``window_size`` and ``max_packet_size`` arguments. """ if not self.active: raise SSHException('SSH session not active') + timeout = 3600 if timeout is None else timeout self.lock.acquire() try: window_size = self._sanitize_window_size(window_size) @@ -722,6 +816,7 @@ class Transport (threading.Thread, ClosingContextManager): finally: self.lock.release() self._send_user_message(m) + start_ts = time.time() while True: event.wait(0.1) if not self.active: @@ -729,8 +824,10 @@ class Transport (threading.Thread, ClosingContextManager): if e is None: e = SSHException('Unable to open channel.') raise e - if event.isSet(): + if event.is_set(): break + elif start_ts + timeout < time.time(): + raise SSHException('Timeout openning channel.') chan = self._channels.get(chanid) if chan is not None: return chan @@ -849,7 +946,7 @@ class Transport (threading.Thread, ClosingContextManager): if e is not None: raise e raise SSHException('Negotiation failed.') - if self.completion_event.isSet(): + if self.completion_event.is_set(): break return @@ -900,7 +997,7 @@ class Transport (threading.Thread, ClosingContextManager): self.completion_event.wait(0.1) if not self.active: return None - if self.completion_event.isSet(): + if self.completion_event.is_set(): break return self.global_response @@ -960,10 +1057,14 @@ class Transport (threading.Thread, ClosingContextManager): :param .PKey pkey: a private key to use for authentication, if you want to use private key authentication; otherwise ``None``. - :param str gss_host: The targets name in the kerberos database. default: hostname - :param bool gss_auth: ``True`` if you want to use GSS-API authentication - :param bool gss_kex: Perform GSS-API Key Exchange and user authentication - :param bool gss_deleg_creds: Delegate GSS-API client credentials or not + :param str gss_host: + The target's name in the kerberos database. Default: hostname + :param bool gss_auth: + ``True`` if you want to use GSS-API authentication. + :param bool gss_kex: + Perform GSS-API Key Exchange and user authentication. + :param bool gss_deleg_creds: + Whether to delegate GSS-API client credentials. :raises SSHException: if the SSH2 negotiation fails, the host key supplied by the server is incorrect, or authentication fails. @@ -1070,6 +1171,8 @@ class Transport (threading.Thread, ClosingContextManager): supplied, this method returns ``None``. :returns: server supplied banner (`str`), or ``None``. + + .. versionadded:: 1.13 """ if not self.active or (self.auth_handler is None): return None @@ -1278,6 +1381,27 @@ class Transport (threading.Thread, ClosingContextManager): self.auth_handler.auth_interactive(username, handler, my_event, submethods) return self.auth_handler.wait_for_response(my_event) + def auth_interactive_dumb(self, username, handler=None, submethods=''): + """ + Autenticate to the server interactively but dumber. + Just print the prompt and / or instructions to stdout and send back + the response. This is good for situations where partial auth is + achieved by key and then the user has to enter a 2fac token. + """ + + if not handler: + def handler(title, instructions, prompt_list): + answers = [] + if title: + print(title.strip()) + if instructions: + print(instructions.strip()) + for prompt,show_input in prompt_list: + print(prompt.strip(),end=' ') + answers.append(input()) + return answers + return self.auth_interactive(username, handler, submethods) + def auth_gssapi_with_mic(self, username, gss_host, gss_deleg_creds): """ Authenticate to the Server using GSS-API / SSPI. @@ -1411,8 +1535,23 @@ class Transport (threading.Thread, ClosingContextManager): def stop_thread(self): self.active = False self.packetizer.close() - while self.is_alive() and (self is not threading.current_thread()): - self.join(10) + if PY2: + # Original join logic; #520 doesn't appear commonly present under + # Python 2. + while self.is_alive() and self is not threading.current_thread(): + self.join(10) + else: + # Keep trying to join() our main thread, quickly, until: + # * We join()ed successfully (self.is_alive() == False) + # * Or it looks like we've hit issue #520 (socket.recv hitting some + # race condition preventing it from timing out correctly), wherein + # our socket and packetizer are both closed (but where we'd + # otherwise be sitting forever on that recv()). + while ( + self.is_alive() and self is not threading.current_thread() + and not self.sock._closed and not self.packetizer.closed + ): + self.join(0.1) ### internals... @@ -1455,7 +1594,7 @@ class Transport (threading.Thread, ClosingContextManager): self._log(DEBUG, 'Dropping user packet because connection is dead.') return self.clear_to_send_lock.acquire() - if self.clear_to_send.isSet(): + if self.clear_to_send.is_set(): break self.clear_to_send_lock.release() if time.time() > start + self.clear_to_send_timeout: @@ -1491,33 +1630,55 @@ class Transport (threading.Thread, ClosingContextManager): m.add_bytes(self.H) m.add_byte(b(id)) m.add_bytes(self.session_id) - out = sofar = sha1(m.asbytes()).digest() + # Fallback to SHA1 for kex engines that fail to specify a hex + # algorithm, or for e.g. transport tests that don't run kexinit. + hash_algo = getattr(self.kex_engine, 'hash_algo', None) + hash_select_msg = "kex engine %s specified hash_algo %r" % (self.kex_engine.__class__.__name__, hash_algo) + if hash_algo is None: + hash_algo = sha1 + hash_select_msg += ", falling back to sha1" + if not hasattr(self, '_logged_hash_selection'): + self._log(DEBUG, hash_select_msg) + setattr(self, '_logged_hash_selection', True) + out = sofar = hash_algo(m.asbytes()).digest() while len(out) < nbytes: m = Message() m.add_mpint(self.K) m.add_bytes(self.H) m.add_bytes(sofar) - digest = sha1(m.asbytes()).digest() + digest = hash_algo(m.asbytes()).digest() out += digest sofar += digest return out[:nbytes] - def _get_cipher(self, name, key, iv): + def _get_cipher(self, name, key, iv, operation): if name not in self._cipher_info: raise SSHException('Unknown client cipher ' + name) if name in ('arcfour128', 'arcfour256'): # arcfour cipher - cipher = self._cipher_info[name]['class'].new(key) + cipher = Cipher( + self._cipher_info[name]['class'](key), + None, + backend=default_backend() + ) + if operation is self._ENCRYPT: + engine = cipher.encryptor() + else: + engine = cipher.decryptor() # as per RFC 4345, the first 1536 bytes of keystream # generated by the cipher MUST be discarded - cipher.encrypt(" " * 1536) - return cipher - elif name.endswith("-ctr"): - # CTR modes, we need a counter - counter = Counter.new(nbits=self._cipher_info[name]['block-size'] * 8, initial_value=util.inflate_long(iv, True)) - return self._cipher_info[name]['class'].new(key, self._cipher_info[name]['mode'], iv, counter) + engine.encrypt(" " * 1536) + return engine else: - return self._cipher_info[name]['class'].new(key, self._cipher_info[name]['mode'], iv) + cipher = Cipher( + self._cipher_info[name]['class'](key), + self._cipher_info[name]['mode'](iv), + backend=default_backend(), + ) + if operation is self._ENCRYPT: + return cipher.encryptor() + else: + return cipher.decryptor() def _set_forward_agent_handler(self, handler): if handler is None: @@ -1548,7 +1709,7 @@ class Transport (threading.Thread, ClosingContextManager): def _sanitize_window_size(self, window_size): if window_size is None: window_size = self.default_window_size - return clamp_value(MIN_PACKET_SIZE, window_size, MAX_WINDOW_SIZE) + return clamp_value(MIN_WINDOW_SIZE, window_size, MAX_WINDOW_SIZE) def _sanitize_packet_size(self, max_packet_size): if max_packet_size is None: @@ -1575,7 +1736,16 @@ class Transport (threading.Thread, ClosingContextManager): try: try: self.packetizer.write_all(b(self.local_version + '\r\n')) + self._log(DEBUG, 'Local version/idstring: %s' % self.local_version) self._check_banner() + # The above is actually very much part of the handshake, but + # sometimes the banner can be read but the machine is not + # responding, for example when the remote ssh daemon is loaded + # in to memory but we can not read from the disk/spawn a new + # shell. + # Make sure we can specify a timeout for the initial handshake. + # Re-use the banner timeout for now. + self.packetizer.start_handshake(self.handshake_timeout) self._send_kex_init() self._expect_packet(MSG_KEXINIT) @@ -1625,6 +1795,7 @@ class Transport (threading.Thread, ClosingContextManager): msg.add_byte(cMSG_UNIMPLEMENTED) msg.add_int(m.seqno) self._send_message(msg) + self.packetizer.complete_handshake() except SSHException as e: self._log(ERROR, 'Exception: ' + str(e)) self._log(ERROR, util.tb_strings()) @@ -1673,6 +1844,18 @@ class Transport (threading.Thread, ClosingContextManager): if self.sys.modules is not None: raise + + def _log_agreement(self, which, local, remote): + # Log useful, non-duplicative line re: an agreed-upon algorithm. + # Old code implied algorithms could be asymmetrical (different for + # inbound vs outbound) so we preserve that possibility. + msg = "{0} agreed: ".format(which) + if local == remote: + msg += local + else: + msg += "local={0}, remote={1}".format(local, remote) + self._log(DEBUG, msg) + ### protocol stages def _negotiate_keys(self, m): @@ -1710,6 +1893,7 @@ class Transport (threading.Thread, ClosingContextManager): raise SSHException('Indecipherable protocol version "' + buf + '"') # save this server version string for later self.remote_version = buf + self._log(DEBUG, 'Remote version/idstring: %s' % buf) # pull off any attached comment comment = '' i = buf.find(' ') @@ -1738,10 +1922,12 @@ class Transport (threading.Thread, ClosingContextManager): self.clear_to_send_lock.release() self.in_kex = True if self.server_mode: - if (self._modulus_pack is None) and ('diffie-hellman-group-exchange-sha1' in self._preferred_kex): + mp_required_prefix = 'diffie-hellman-group-exchange-sha' + kex_mp = [k for k in self._preferred_kex if k.startswith(mp_required_prefix)] + if (self._modulus_pack is None) and (len(kex_mp) > 0): # can't do group-exchange if we don't have a pack of potential primes - pkex = list(self.get_security_options().kex) - pkex.remove('diffie-hellman-group-exchange-sha1') + pkex = [k for k in self.get_security_options().kex + if not k.startswith(mp_required_prefix)] self.get_security_options().kex = pkex available_server_keys = list(filter(list(self.server_key_dict.keys()).__contains__, self._preferred_keys)) @@ -1793,15 +1979,24 @@ class Transport (threading.Thread, ClosingContextManager): ' server lang:' + str(server_lang_list) + ' kex follows?' + str(kex_follows)) - # as a server, we pick the first item in the client's list that we support. - # as a client, we pick the first item in our list that the server supports. + # as a server, we pick the first item in the client's list that we + # support. + # as a client, we pick the first item in our list that the server + # supports. if self.server_mode: - agreed_kex = list(filter(self._preferred_kex.__contains__, kex_algo_list)) + agreed_kex = list(filter( + self._preferred_kex.__contains__, + kex_algo_list + )) else: - agreed_kex = list(filter(kex_algo_list.__contains__, self._preferred_kex)) + agreed_kex = list(filter( + kex_algo_list.__contains__, + self._preferred_kex + )) if len(agreed_kex) == 0: raise SSHException('Incompatible ssh peer (no acceptable kex algorithm)') self.kex_engine = self._kex_info[agreed_kex[0]](self) + self._log(DEBUG, "Kex agreed: %s" % agreed_kex[0]) if self.server_mode: available_server_keys = list(filter(list(self.server_key_dict.keys()).__contains__, @@ -1829,7 +2024,9 @@ class Transport (threading.Thread, ClosingContextManager): raise SSHException('Incompatible ssh server (no acceptable ciphers)') self.local_cipher = agreed_local_ciphers[0] self.remote_cipher = agreed_remote_ciphers[0] - self._log(DEBUG, 'Ciphers agreed: local=%s, remote=%s' % (self.local_cipher, self.remote_cipher)) + self._log_agreement( + 'Cipher', local=self.local_cipher, remote=self.remote_cipher + ) if self.server_mode: agreed_remote_macs = list(filter(self._preferred_macs.__contains__, client_mac_algo_list)) @@ -1841,6 +2038,9 @@ class Transport (threading.Thread, ClosingContextManager): raise SSHException('Incompatible ssh server (no acceptable macs)') self.local_mac = agreed_local_macs[0] self.remote_mac = agreed_remote_macs[0] + self._log_agreement( + 'MAC', local=self.local_mac, remote=self.remote_mac + ) if self.server_mode: agreed_remote_compression = list(filter(self._preferred_compression.__contains__, client_compress_algo_list)) @@ -1852,10 +2052,11 @@ class Transport (threading.Thread, ClosingContextManager): raise SSHException('Incompatible ssh server (no acceptable compression) %r %r %r' % (agreed_local_compression, agreed_remote_compression, self._preferred_compression)) self.local_compression = agreed_local_compression[0] self.remote_compression = agreed_remote_compression[0] - - self._log(DEBUG, 'using kex %s; server key type %s; cipher: local %s, remote %s; mac: local %s, remote %s; compression: local %s, remote %s' % - (agreed_kex[0], self.host_key_type, self.local_cipher, self.remote_cipher, self.local_mac, - self.remote_mac, self.local_compression, self.remote_compression)) + self._log_agreement( + 'Compression', + local=self.local_compression, + remote=self.remote_compression + ) # save for computing hash later... # now wait! openssh has a bug (and others might too) where there are @@ -1873,11 +2074,11 @@ class Transport (threading.Thread, ClosingContextManager): else: IV_in = self._compute_key('B', block_size) key_in = self._compute_key('D', self._cipher_info[self.remote_cipher]['key-size']) - engine = self._get_cipher(self.remote_cipher, key_in, IV_in) + engine = self._get_cipher(self.remote_cipher, key_in, IV_in, self._DECRYPT) mac_size = self._mac_info[self.remote_mac]['size'] mac_engine = self._mac_info[self.remote_mac]['class'] - # initial mac keys are done in the hash's natural size (not the potentially truncated - # transmission size) + # initial mac keys are done in the hash's natural size (not the + # potentially truncated transmission size) if self.server_mode: mac_key = self._compute_key('E', mac_engine().digest_size) else: @@ -1900,11 +2101,11 @@ class Transport (threading.Thread, ClosingContextManager): else: IV_out = self._compute_key('A', block_size) key_out = self._compute_key('C', self._cipher_info[self.local_cipher]['key-size']) - engine = self._get_cipher(self.local_cipher, key_out, IV_out) + engine = self._get_cipher(self.local_cipher, key_out, IV_out, self._ENCRYPT) mac_size = self._mac_info[self.local_mac]['size'] mac_engine = self._mac_info[self.local_mac]['class'] - # initial mac keys are done in the hash's natural size (not the potentially truncated - # transmission size) + # initial mac keys are done in the hash's natural size (not the + # potentially truncated transmission size) if self.server_mode: mac_key = self._compute_key('F', mac_engine().digest_size) else: @@ -2145,7 +2346,7 @@ class Transport (threading.Thread, ClosingContextManager): always_display = m.get_boolean() msg = m.get_string() lang = m.get_string() - self._log(DEBUG, 'Debug msg: ' + util.safe_string(msg)) + self._log(DEBUG, 'Debug msg: {0}'.format(util.safe_string(msg))) def _get_subsystem_handler(self, name): try: @@ -2203,21 +2404,6 @@ class SecurityOptions (object): """ return '<paramiko.SecurityOptions for %s>' % repr(self._transport) - def _get_ciphers(self): - return self._transport._preferred_ciphers - - def _get_digests(self): - return self._transport._preferred_macs - - def _get_key_types(self): - return self._transport._preferred_keys - - def _get_kex(self): - return self._transport._preferred_kex - - def _get_compression(self): - return self._transport._preferred_compression - def _set(self, name, orig, x): if type(x) is list: x = tuple(x) @@ -2229,30 +2415,51 @@ class SecurityOptions (object): raise ValueError('unknown cipher') setattr(self._transport, name, x) - def _set_ciphers(self, x): + @property + def ciphers(self): + """Symmetric encryption ciphers""" + return self._transport._preferred_ciphers + + @ciphers.setter + def ciphers(self, x): self._set('_preferred_ciphers', '_cipher_info', x) - def _set_digests(self, x): + @property + def digests(self): + """Digest (one-way hash) algorithms""" + return self._transport._preferred_macs + + @digests.setter + def digests(self, x): self._set('_preferred_macs', '_mac_info', x) - def _set_key_types(self, x): + @property + def key_types(self): + """Public-key algorithms""" + return self._transport._preferred_keys + + @key_types.setter + def key_types(self, x): self._set('_preferred_keys', '_key_info', x) - def _set_kex(self, x): + + @property + def kex(self): + """Key exchange algorithms""" + return self._transport._preferred_kex + + @kex.setter + def kex(self, x): self._set('_preferred_kex', '_kex_info', x) - def _set_compression(self, x): - self._set('_preferred_compression', '_compression_info', x) + @property + def compression(self): + """Compression algorithms""" + return self._transport._preferred_compression - ciphers = property(_get_ciphers, _set_ciphers, None, - "Symmetric encryption ciphers") - digests = property(_get_digests, _set_digests, None, - "Digest (one-way hash) algorithms") - key_types = property(_get_key_types, _set_key_types, None, - "Public-key algorithms") - kex = property(_get_kex, _set_kex, None, "Key exchange algorithms") - compression = property(_get_compression, _set_compression, None, - "Compression algorithms") + @compression.setter + def compression(self, x): + self._set('_preferred_compression', '_compression_info', x) class ChannelMap (object): |