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# Copyright (C) 2003-2007 Robey Pointer <robeypointer@gmail.com>
# Copyright (C) 2013-2014 science + computing ag
# Author: Sebastian Deiss <sebastian.deiss@t-online.de>
#
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
Unit Tests for the GSS-API / SSPI SSHv2 Diffie-Hellman Key Exchange and user
authentication
"""
import socket
import threading
import unittest
import paramiko
from ._util import needs_gssapi, KerberosTestCase, update_env, _support
class NullServer(paramiko.ServerInterface):
def get_allowed_auths(self, username):
return "gssapi-keyex"
def check_auth_gssapi_keyex(
self, username, gss_authenticated=paramiko.AUTH_FAILED, cc_file=None
):
if gss_authenticated == paramiko.AUTH_SUCCESSFUL:
return paramiko.AUTH_SUCCESSFUL
return paramiko.AUTH_FAILED
def enable_auth_gssapi(self):
UseGSSAPI = True
return UseGSSAPI
def check_channel_request(self, kind, chanid):
return paramiko.OPEN_SUCCEEDED
def check_channel_exec_request(self, channel, command):
if command != b"yes":
return False
return True
@needs_gssapi
class GSSKexTest(KerberosTestCase):
def setUp(self):
self.username = self.realm.user_princ
self.hostname = socket.getfqdn(self.realm.hostname)
self.sockl = socket.socket()
self.sockl.bind((self.realm.hostname, 0))
self.sockl.listen(1)
self.addr, self.port = self.sockl.getsockname()
self.event = threading.Event()
update_env(self, self.realm.env)
thread = threading.Thread(target=self._run)
thread.start()
def tearDown(self):
for attr in "tc ts socks sockl".split():
if hasattr(self, attr):
getattr(self, attr).close()
def _run(self):
self.socks, addr = self.sockl.accept()
self.ts = paramiko.Transport(self.socks, gss_kex=True)
host_key = paramiko.RSAKey.from_private_key_file(_support("rsa.key"))
self.ts.add_server_key(host_key)
self.ts.set_gss_host(self.realm.hostname)
try:
self.ts.load_server_moduli()
except:
print("(Failed to load moduli -- gex will be unsupported.)")
server = NullServer()
self.ts.start_server(self.event, server)
def _test_gsskex_and_auth(self, gss_host, rekey=False):
"""
Verify that Paramiko can handle SSHv2 GSS-API / SSPI authenticated
Diffie-Hellman Key Exchange and user authentication with the GSS-API
context created during key exchange.
"""
host_key = paramiko.RSAKey.from_private_key_file(_support("rsa.key"))
public_host_key = paramiko.RSAKey(data=host_key.asbytes())
self.tc = paramiko.SSHClient()
self.tc.get_host_keys().add(
f"[{self.hostname}]:{self.port}", "ssh-rsa", public_host_key
)
self.tc.connect(
self.hostname,
self.port,
username=self.username,
gss_auth=True,
gss_kex=True,
gss_host=gss_host,
)
self.event.wait(1.0)
self.assert_(self.event.is_set())
self.assert_(self.ts.is_active())
self.assertEquals(self.username, self.ts.get_username())
self.assertEquals(True, self.ts.is_authenticated())
self.assertEquals(True, self.tc.get_transport().gss_kex_used)
stdin, stdout, stderr = self.tc.exec_command("yes")
schan = self.ts.accept(1.0)
if rekey:
self.tc.get_transport().renegotiate_keys()
schan.send("Hello there.\n")
schan.send_stderr("This is on stderr.\n")
schan.close()
self.assertEquals("Hello there.\n", stdout.readline())
self.assertEquals("", stdout.readline())
self.assertEquals("This is on stderr.\n", stderr.readline())
self.assertEquals("", stderr.readline())
stdin.close()
stdout.close()
stderr.close()
def test_gsskex_and_auth(self):
"""
Verify that Paramiko can handle SSHv2 GSS-API / SSPI authenticated
Diffie-Hellman Key Exchange and user authentication with the GSS-API
context created during key exchange.
"""
self._test_gsskex_and_auth(gss_host=None)
# To be investigated, see https://github.com/paramiko/paramiko/issues/1312
@unittest.expectedFailure
def test_gsskex_and_auth_rekey(self):
"""
Verify that Paramiko can rekey.
"""
self._test_gsskex_and_auth(gss_host=None, rekey=True)
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