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[project @ Arch-1:robey@lag.net--2003-public%secsh--dev--1.0--patch-7] 

cleaned up server code, renamed some files & classes
renamed demo-server.py and demo-host-key to demo_server.py and
demo_host_key, just to be consistent.

renamed SSHException -> SecshException.

generalized the mechanism where Channel decides whether to allow
different channel requests: 4 of the main ones (pty, window-change,
shell, and subsystem) go through easily override-able methods now.
you could probably make an actual ssh shell server.

gave ChannelFile a repr().

turned off ultra debugging in the demos.  demo_server creates a
subclass of Channel to allow pty/shell and sets an event when the
shell request is made, so that it knows when it can start sending
the fake bbs.

renamed to charmander and updated some of the distutils files.
This commit is contained in:
Robey Pointer 2003-11-10 04:54:02 +00:00
parent 0e1ef2c65c
commit aad7b859f1
12 changed files with 127 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
MANIFEST
View File

@ -1,4 +1,5 @@
README
auth_transport.py
ber.py
channel.py
dsskey.py
@ -11,3 +12,5 @@ setup.py
transport.py
util.py
demo.py
demo_server.py
demo_host_key

3
NOTES
View File

@ -58,6 +58,9 @@ from Channel:
exec_command
invoke_subsystem
resize_pty
[server:]
check_pty_request
check_shell_request
from ChannelFile:
next

8
auth_transport.py
View File

@ -4,7 +4,7 @@ from transport import BaseTransport
from transport import MSG_SERVICE_REQUEST, MSG_SERVICE_ACCEPT, MSG_USERAUTH_REQUEST, MSG_USERAUTH_FAILURE, \
MSG_USERAUTH_SUCCESS, MSG_USERAUTH_BANNER
from message import Message
from secsh import SSHException
from secsh import SecshException
from logging import DEBUG, INFO, WARNING, ERROR, CRITICAL
DISCONNECT_SERVICE_NOT_AVAILABLE, DISCONNECT_AUTH_CANCELLED_BY_USER, \
@ -34,7 +34,7 @@ class Transport(BaseTransport):
def auth_key(self, username, key, event):
if (not self.active) or (not self.initial_kex_done):
# we should never try to send the password unless we're on a secure link
raise SSHException('No existing session')
raise SecshException('No existing session')
try:
self.lock.acquire()
self.auth_event = event
@ -49,7 +49,7 @@ class Transport(BaseTransport):
'authenticate using a password; event is triggered on success or fail'
if (not self.active) or (not self.initial_kex_done):
# we should never try to send the password unless we're on a secure link
raise SSHException('No existing session')
raise SecshException('No existing session')
try:
self.lock.acquire()
self.auth_event = event
@ -108,7 +108,7 @@ class Transport(BaseTransport):
m.add_string(str(self.private_key))
m.add_string(self.private_key.sign_ssh_session(self.randpool, self.H, self.username))
else:
raise SSHException('Unknown auth method "%s"' % self.auth_method)
raise SecshException('Unknown auth method "%s"' % self.auth_method)
self.send_message(m)
else:
self.log(DEBUG, 'Service request "%s" accepted (?)' % service)

57
channel.py
View File

@ -1,5 +1,5 @@
from message import Message
from secsh import SSHException
from secsh import SecshException
from transport import MSG_CHANNEL_REQUEST, MSG_CHANNEL_CLOSE, MSG_CHANNEL_WINDOW_ADJUST, MSG_CHANNEL_DATA, \
MSG_CHANNEL_EOF, MSG_CHANNEL_SUCCESS, MSG_CHANNEL_FAILURE
@ -100,6 +100,22 @@ class Channel(object):
finally:
self.lock.release()
def check_pty_request(self, term, width, height, pixelwidth, pixelheight, modes):
"override me! return True if a pty of the given dimensions (for shell access, usually) can be provided"
return False
def check_shell_request(self):
"override me! return True if shell access will be provided"
return False
def check_subsystem_request(self, name):
"override me! return True if the given subsystem can be provided"
return False
def check_window_change_request(self, width, height, pixelwidth, pixelheight):
"override me! return True if the pty was resized"
return False
def handle_request(self, m):
key = m.get_string()
want_reply = m.get_boolean()
@ -110,10 +126,25 @@ class Channel(object):
elif key == 'xon-xoff':
# ignore
ok = True
elif (key == 'pty-req') or (key == 'shell'):
if self.transport.server_mode:
# humor them
ok = True
elif key == 'pty-req':
term = m.get_string()
width = m.get_int()
height = m.get_int()
pixelwidth = m.get_int()
pixelheight = m.get_int()
modes = m.get_string()
ok = self.check_pty_request(term, width, height, pixelwidth, pixelheight, modes)
elif key == 'shell':
ok = self.check_shell_request()
elif key == 'subsystem':
name = m.get_string()
ok = self.check_subsystem_request(name)
elif key == 'window-change':
width = m.get_int()
height = m.get_int()
pixelwidth = m.get_int()
pixelheight = m.get_int()
ok = self.check_window_change_request(width, height, pixelwidth, pixelheight)
else:
self.log(DEBUG, 'Unhandled channel request "%s"' % key)
ok = False
@ -155,7 +186,7 @@ class Channel(object):
def get_pty(self, term='vt100', width=80, height=24):
if self.closed or self.eof_received or self.eof_sent or not self.active:
raise SSHException('Channel is not open')
raise SecshException('Channel is not open')
m = Message()
m.add_byte(chr(MSG_CHANNEL_REQUEST))
m.add_int(self.remote_chanid)
@ -171,7 +202,7 @@ class Channel(object):
def invoke_shell(self):
if self.closed or self.eof_received or self.eof_sent or not self.active:
raise SSHException('Channel is not open')
raise SecshException('Channel is not open')
m = Message()
m.add_byte(chr(MSG_CHANNEL_REQUEST))
m.add_int(self.remote_chanid)
@ -181,7 +212,7 @@ class Channel(object):
def exec_command(self, command):
if self.closed or self.eof_received or self.eof_sent or not self.active:
raise SSHException('Channel is not open')
raise SecshException('Channel is not open')
m = Message()
m.add_byte(chr(MSG_CHANNEL_REQUEST))
m.add_int(self.remote_chanid)
@ -192,7 +223,7 @@ class Channel(object):
def invoke_subsystem(self, subsystem):
if self.closed or self.eof_received or self.eof_sent or not self.active:
raise SSHException('Channel is not open')
raise SecshException('Channel is not open')
m = Message()
m.add_byte(chr(MSG_CHANNEL_REQUEST))
m.add_int(self.remote_chanid)
@ -203,7 +234,7 @@ class Channel(object):
def resize_pty(self, width=80, height=24):
if self.closed or self.eof_received or self.eof_sent or not self.active:
raise SSHException('Channel is not open')
raise SecshException('Channel is not open')
m = Message()
m.add_byte(chr(MSG_CHANNEL_REQUEST))
m.add_int(self.remote_chanid)
@ -500,9 +531,6 @@ class ChannelFile(object):
XXX Todo: the channel and its file-wrappers should be able to be closed or
garbage-collected independently, for compatibility with real sockets and
their file-wrappers. Currently, closing does nothing but flush the buffer.
XXX Todo: translation of the various forms of newline is not implemented,
let alone the universal newline. Line buffering (for writing) is
implemented, though, which makes little sense without text mode support.
"""
def __init__(self, channel, mode = "r", buf_size = -1):
@ -528,6 +556,9 @@ class ChannelFile(object):
self.newlines = None
self.softspace = False
def __repr__(self):
return '<secsh.ChannelFile from ' + repr(self.channel) + '>'
def __iter__(self):
return self

2
demo.py
View File

@ -66,7 +66,7 @@ except Exception, e:
try:
event = threading.Event()
t = secsh.Transport(sock)
t.ultra_debug = 1
t.ultra_debug = 0
t.start_client(event)
# print repr(t)
event.wait(10)

0
demo-host-key → demo_host_key
View File

30
demo-server.py → demo_server.py
View File

@ -1,25 +1,25 @@
#!/usr/bin/python
import sys, os, socket, threading, logging, traceback, time
import sys, os, socket, threading, logging, traceback
import secsh
# setup logging
l = logging.getLogger("secsh")
l.setLevel(logging.DEBUG)
if len(l.handlers) == 0:
f = open('demo-server.log', 'w')
f = open('demo_server.log', 'w')
lh = logging.StreamHandler(f)
lh.setFormatter(logging.Formatter('%(levelname)-.3s [%(asctime)s] %(name)s: %(message)s', '%Y%m%d:%H%M%S'))
l.addHandler(lh)
host_key = secsh.RSAKey()
host_key.read_private_key_file('demo-host-key')
host_key.read_private_key_file('demo_host_key')
class ServerTransport(secsh.Transport):
def check_channel_request(self, kind, chanid):
if kind == 'session':
return secsh.Channel(chanid)
return ServerChannel(chanid)
return self.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED
def check_auth_password(self, username, password):
@ -27,6 +27,20 @@ class ServerTransport(secsh.Transport):
return self.AUTH_SUCCESSFUL
return self.AUTH_FAILED
class ServerChannel(secsh.Channel):
"Channel descendant that pretends to understand pty and shell requests"
def __init__(self, chanid):
secsh.Channel.__init__(self, chanid)
self.event = threading.Event()
def check_pty_request(self, term, width, height, pixelwidth, pixelheight, modes):
return True
def check_shell_request(self):
self.event.set()
return True
# now connect
try:
@ -50,7 +64,7 @@ try:
event = threading.Event()
t = ServerTransport(client)
t.add_server_key(host_key)
t.ultra_debug = 1
t.ultra_debug = 0
t.start_server(event)
# print repr(t)
event.wait(10)
@ -60,7 +74,11 @@ try:
# print repr(t)
chan = t.accept()
time.sleep(2)
chan.event.wait(10)
if not chan.event.isSet():
print '*** Client never asked for a shell.'
sys.exit(1)
chan.send('\r\n\r\nWelcome to my dorky little BBS!\r\n\r\n')
chan.send('We are on fire all the time! Hooray! Candy corn for everyone!\r\n')
chan.send('Happy birthday to Robot Dave!\r\n\r\n')

24
kex_gex.py
View File

@ -5,8 +5,8 @@
# LOT more on the server side).
from message import Message
from util import inflate_long, deflate_long, generate_prime
from secsh import SSHException
from util import inflate_long, deflate_long, generate_prime, bit_length
from secsh import SecshException
from transport import MSG_NEWKEYS
from Crypto.Hash import SHA
from Crypto.Util import number
@ -49,17 +49,7 @@ class KexGex(object):
return self.parse_kexdh_gex_init(m)
elif ptype == MSG_KEXDH_GEX_REPLY:
return self.parse_kexdh_gex_reply(m)
raise SSHException('KexGex asked to handle packet type %d' % ptype)
def bit_length(n):
norm = deflate_long(n, 0)
hbyte = ord(norm[0])
bitlen = len(norm) * 8
while not (hbyte & 0x80):
hbyte <<= 1
bitlen -= 1
return bitlen
bit_length = staticmethod(bit_length)
raise SecshException('KexGex asked to handle packet type %d' % ptype)
def generate_x(self):
# generate an "x" (1 < x < (p-1)/2).
@ -116,9 +106,9 @@ class KexGex(object):
self.p = m.get_mpint()
self.g = m.get_mpint()
# reject if p's bit length < 1024 or > 8192
bitlen = self.bit_length(self.p)
bitlen = bit_length(self.p)
if (bitlen < 1024) or (bitlen > 8192):
raise SSHException('Server-generated gex p (don\'t ask) is out of range (%d bits)' % bitlen)
raise SecshException('Server-generated gex p (don\'t ask) is out of range (%d bits)' % bitlen)
self.transport.log(DEBUG, 'Got server p (%d bits)' % bitlen)
self.generate_x()
# now compute e = g^x mod p
@ -132,7 +122,7 @@ class KexGex(object):
def parse_kexdh_gex_init(self, m):
self.e = m.get_mpint()
if (self.e < 1) or (self.e > self.p - 1):
raise SSHException('Client kex "e" is out of range')
raise SecshException('Client kex "e" is out of range')
self.generate_x()
K = pow(self.e, self.x, P)
key = str(self.transport.get_server_key())
@ -164,7 +154,7 @@ class KexGex(object):
self.f = m.get_mpint()
sig = m.get_string()
if (self.f < 1) or (self.f > self.p - 1):
raise SSHException('Server kex "f" is out of range')
raise SecshException('Server kex "f" is out of range')
K = pow(self.f, self.x, self.p)
# okay, build up the hash H of (V_C || V_S || I_C || I_S || K_S || min || n || max || p || g || e || f || K)
hm = Message().add(self.transport.local_version).add(self.transport.remote_version)

8
kex_group1.py
View File

@ -5,7 +5,7 @@
# "g" generator.
from message import Message, inflate_long
from secsh import SSHException
from secsh import SecshException
from transport import MSG_NEWKEYS
from Crypto.Hash import SHA
from logging import DEBUG, INFO, WARNING, ERROR, CRITICAL
@ -59,14 +59,14 @@ class KexGroup1(object):
return self.parse_kexdh_init(m)
elif not self.transport.server_mode and (ptype == MSG_KEXDH_REPLY):
return self.parse_kexdh_reply(m)
raise SSHException('KexGroup1 asked to handle packet type %d' % ptype)
raise SecshException('KexGroup1 asked to handle packet type %d' % ptype)
def parse_kexdh_reply(self, m):
# client mode
host_key = m.get_string()
self.f = m.get_mpint()
if (self.f < 1) or (self.f > P - 1):
raise SSHException('Server kex "f" is out of range')
raise SecshException('Server kex "f" is out of range')
sig = m.get_string()
K = pow(self.f, self.x, P)
# okay, build up the hash H of (V_C || V_S || I_C || I_S || K_S || e || f || K)
@ -82,7 +82,7 @@ class KexGroup1(object):
# server mode
self.e = m.get_mpint()
if (self.e < 1) or (self.e > P - 1):
raise SSHException('Client kex "e" is out of range')
raise SecshException('Client kex "e" is out of range')
K = pow(self.e, self.x, P)
key = str(self.transport.get_server_key())
# okay, build up the hash H of (V_C || V_S || I_C || I_S || K_S || e || f || K)

7
secsh.py
View File

@ -5,8 +5,7 @@ import sys
if (sys.version_info[0] < 2) or ((sys.version_info[0] == 2) and (sys.version_info[1] < 3)):
raise RuntimeError('You need python 2.3 for this module.')
# FIXME rename
class SSHException(Exception):
class SecshException(Exception):
pass
@ -17,7 +16,7 @@ from dsskey import DSSKey
__author__ = "Robey Pointer <robey@lag.net>"
__date__ = "18 Sep 2003"
__version__ = "0.1-bulbasaur"
__date__ = "9 Nov 2003"
__version__ = "0.1-charmander"
__credits__ = "Huzzah!"

16
setup.py
View File

@ -1,23 +1,25 @@
from distutils.core import setup
longdesc = '''
This is a library for making client-side SSH2 connections (server-side is
coming soon). All major ciphers and hash methods are supported.
This is a library for making SSH2 connections (client or server).
Emphasis is on using SSH2 as an alternative to SSL for making secure
connections between pyton scripts. All major ciphers and hash methods
are supported.
Required packages:
pyCrypto
'''
setup(name = "secsh",
version = "0.1-bulbasaur",
version = "0.1-charmander",
description = "SSH2 protocol library",
author = "Robey Pointer",
author_email = "robey@lag.net",
url = "http://www.lag.net/~robey/secsh/",
py_modules = [ 'secsh', 'transport', 'channel', 'message', 'util', 'ber',
'kex_group1', 'kex_gex', 'rsakey', 'dsskey' ],
scripts = [ 'demo.py' ],
download_url = 'http://www.lag.net/~robey/secsh/secsh-0.1-bulbasaur.zip',
py_modules = [ 'secsh', 'transport', 'auth_transport', 'channel',
'message', 'util', 'ber', 'kex_group1', 'kex_gex',
'rsakey', 'dsskey' ],
download_url = 'http://www.lag.net/~robey/secsh/secsh-0.1-charmander.zip',
license = 'LGPL',
platforms = 'Posix; MacOS X; Windows',
classifiers = [ 'Development Status :: 3 - Alpha',

47
transport.py
View File

@ -14,7 +14,7 @@ MSG_CHANNEL_OPEN, MSG_CHANNEL_OPEN_SUCCESS, MSG_CHANNEL_OPEN_FAILURE, \
import sys, os, string, threading, socket, logging, struct
from message import Message
from channel import Channel
from secsh import SSHException
from secsh import SecshException
from util import format_binary, safe_string, inflate_long, deflate_long, tb_strings
from rsakey import RSAKey
from dsskey import DSSKey
@ -79,8 +79,7 @@ class BaseTransport(threading.Thread):
preferred_ciphers = [ 'aes128-cbc', 'blowfish-cbc', 'aes256-cbc', '3des-cbc' ]
preferred_macs = [ 'hmac-sha1', 'hmac-md5', 'hmac-sha1-96', 'hmac-md5-96' ]
preferred_keys = [ 'ssh-rsa', 'ssh-dss' ]
preferred_kex = [ 'diffie-hellman-group1-sha1' ]
# preferred_kex = [ 'diffie-hellman-group1-sha1', 'diffie-hellman-group-exchange-sha1' ]
preferred_kex = [ 'diffie-hellman-group1-sha1', 'diffie-hellman-group-exchange-sha1' ]
cipher_info = {
'blowfish-cbc': { 'class': Blowfish, 'mode': Blowfish.MODE_CBC, 'block-size': 8, 'key-size': 16 },
@ -203,7 +202,7 @@ class BaseTransport(threading.Thread):
def get_remote_server_key(self):
'returns (type, key) where type is like "ssh-rsa" and key is an opaque string'
if (not self.active) or (not self.initial_kex_done):
raise SSHException('No existing session')
raise SecshException('No existing session')
key_msg = Message(self.host_key)
key_type = key_msg.get_string()
return key_type, self.host_key
@ -324,7 +323,7 @@ class BaseTransport(threading.Thread):
# leftover contains decrypted bytes from the first block (after the length field)
leftover = header[4:]
if (packet_size - len(leftover)) % self.block_size_in != 0:
raise SSHException('Invalid packet blocking')
raise SecshException('Invalid packet blocking')
buffer = self.read_all(packet_size + self.remote_mac_len - len(leftover))
packet = buffer[:packet_size - len(leftover)]
post_packet = buffer[packet_size - len(leftover):]
@ -338,7 +337,7 @@ class BaseTransport(threading.Thread):
mac_payload = struct.pack('>II', self.sequence_number_in, packet_size) + packet
my_mac = HMAC.HMAC(self.mac_key_in, mac_payload, self.remote_mac_engine).digest()[:self.remote_mac_len]
if my_mac != mac:
raise SSHException('Mismatched MAC')
raise SecshException('Mismatched MAC')
padding = ord(packet[0])
payload = packet[1:packet_size - padding + 1]
randpool.add_event(packet[packet_size - padding + 1])
@ -361,7 +360,7 @@ class BaseTransport(threading.Thread):
# comply, then just drop the connection
self.received_packets_overflow += 1
if self.received_packets_overflow >= 20:
raise SSHException('Remote transport is ignoring rekey requests')
raise SecshException('Remote transport is ignoring rekey requests')
return ord(payload[0]), msg
@ -380,9 +379,9 @@ class BaseTransport(threading.Thread):
else:
key = None
if (key == None) or not key.valid:
raise SSHException('Unknown host key type')
raise SecshException('Unknown host key type')
if not key.verify_ssh_sig(self.H, Message(sig)):
raise SSHException('Signature verification (%s) failed. Boo. Robey should debug this.' % self.host_key_type)
raise SecshException('Signature verification (%s) failed. Boo. Robey should debug this.' % self.host_key_type)
self.host_key = host_key
def compute_key(self, id, nbytes):
@ -405,7 +404,7 @@ class BaseTransport(threading.Thread):
def get_cipher(self, name, key, iv):
if not self.cipher_info.has_key(name):
raise SSHException('Unknown client cipher ' + name)
raise SecshException('Unknown client cipher ' + name)
return self.cipher_info[name]['class'].new(key, self.cipher_info[name]['mode'], iv)
def run(self):
@ -430,7 +429,7 @@ class BaseTransport(threading.Thread):
continue
if self.expected_packet != 0:
if ptype != self.expected_packet:
raise SSHException('Expecting packet %d, got %d' % (self.expected_packet, ptype))
raise SecshException('Expecting packet %d, got %d' % (self.expected_packet, ptype))
self.expected_packet = 0
if (ptype >= 30) and (ptype <= 39):
self.kex_engine.parse_next(ptype, m)
@ -448,7 +447,7 @@ class BaseTransport(threading.Thread):
msg.add_byte(chr(MSG_UNIMPLEMENTED))
msg.add_int(m.seqno)
self.send_message(msg)
except SSHException, e:
except SecshException, e:
self.log(DEBUG, 'Exception: ' + str(e))
self.log(DEBUG, tb_strings())
except EOFError, e:
@ -480,7 +479,7 @@ class BaseTransport(threading.Thread):
return 1
def negotiate_keys(self, m):
# throws SSHException on anything unusual
# throws SecshException on anything unusual
if self.local_kex_init == None:
# remote side wants to renegotiate
self.send_kex_init()
@ -500,7 +499,7 @@ class BaseTransport(threading.Thread):
break
self.log(DEBUG, 'Banner: ' + buffer)
if buffer[:4] != 'SSH-':
raise SSHException('Indecipherable protocol version "' + buffer + '"')
raise SecshException('Indecipherable protocol version "' + buffer + '"')
# save this server version string for later
self.remote_version = buffer
# pull off any attached comment
@ -512,15 +511,19 @@ class BaseTransport(threading.Thread):
# parse out version string and make sure it matches
segs = buffer.split('-', 2)
if len(segs) < 3:
raise SSHException('Invalid SSH banner')
raise SecshException('Invalid SSH banner')
version = segs[1]
client = segs[2]
if version != '1.99' and version != '2.0':
raise SSHException('Incompatible version (%s instead of 2.0)' % (version,))
raise SecshException('Incompatible version (%s instead of 2.0)' % (version,))
self.log(INFO, 'Connected (version %s, client %s)' % (version, client))
def send_kex_init(self):
# send a really wimpy kex-init packet that says we're a bare-bones ssh client
if self.server_mode:
# FIXME: can't do group-exchange (gex) yet -- too slow
if 'diffie-hellman-group-exchange-sha1' in self.preferred_kex:
self.preferred_kex.remove('diffie-hellman-group-exchange-sha1')
m = Message()
m.add_byte(chr(MSG_KEXINIT))
m.add_bytes(randpool.get_bytes(16))
@ -563,7 +566,7 @@ class BaseTransport(threading.Thread):
# no compression support (yet?)
if (not('none' in client_compress_algo_list) or
not('none' in server_compress_algo_list)):
raise SSHException('Incompatible ssh peer.')
raise SecshException('Incompatible ssh peer.')
# 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.
@ -572,7 +575,7 @@ class BaseTransport(threading.Thread):
else:
agreed_kex = filter(kex_algo_list.__contains__, self.preferred_kex)
if len(agreed_kex) == 0:
raise SSHException('Incompatible ssh peer (no acceptable kex algorithm)')
raise SecshException('Incompatible ssh peer (no acceptable kex algorithm)')
self.kex_engine = self.kex_info[agreed_kex[0]](self)
if self.server_mode:
@ -580,10 +583,10 @@ class BaseTransport(threading.Thread):
else:
agreed_keys = filter(server_key_algo_list.__contains__, self.preferred_keys)
if len(agreed_keys) == 0:
raise SSHException('Incompatible ssh peer (no acceptable host key)')
raise SecshException('Incompatible ssh peer (no acceptable host key)')
self.host_key_type = agreed_keys[0]
if self.server_mode and (self.get_server_key() is None):
raise SSHException('Incompatible ssh peer (can\'t match requested host key type)')
raise SecshException('Incompatible ssh peer (can\'t match requested host key type)')
if self.server_mode:
agreed_local_ciphers = filter(self.preferred_ciphers.__contains__,
@ -596,7 +599,7 @@ class BaseTransport(threading.Thread):
agreed_remote_ciphers = filter(server_encrypt_algo_list.__contains__,
self.preferred_ciphers)
if (len(agreed_local_ciphers) == 0) or (len(agreed_remote_ciphers) == 0):
raise SSHException('Incompatible ssh server (no acceptable ciphers)')
raise SecshException('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))
@ -608,7 +611,7 @@ class BaseTransport(threading.Thread):
agreed_local_macs = filter(client_mac_algo_list.__contains__, self.preferred_macs)
agreed_remote_macs = filter(server_mac_algo_list.__contains__, self.preferred_macs)
if (len(agreed_local_macs) == 0) or (len(agreed_remote_macs) == 0):
raise SSHException('Incompatible ssh server (no acceptable macs)')
raise SecshException('Incompatible ssh server (no acceptable macs)')
self.local_mac = agreed_local_macs[0]
self.remote_mac = agreed_remote_macs[0]