def __get_ssh_credentials(self):
try:
f = open(self.ssh_credentials, 'r')
data = f.readlines()
f.close()
except IOError as ex:
self.error_logger.error('Could not access credential file. IOError: %s' % ex)
return None, None
username, password = None, None
for line in data:
if 'username:'******':')
if len(toks) < 2:
self.logger.error('Username was None')
raise paramiko.AuthenticationException('Username not found.')
username = toks[1].strip()
elif 'password' in line:
toks = line.split(':')
if len(toks) < 2:
self.logger.error('Password was None')
raise paramiko.AuthenticationException('Password not found.')
password = toks[1].strip()
return username, password
def _connect(self):
self._ssh = paramiko.SSHClient()
known_host_file = self._known_host_file or os.path.expanduser(
os.path.join("~", ".ssh", "known_hosts"))
if os.path.exists(known_host_file):
self._ssh.load_host_keys(known_host_file)
# and automatically add new host keys for hosts we haven't seen before.
self._ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
self._ssh.connect(self._host, **self._params)
except paramiko.AuthenticationException as e:
if self._interactive and 'password' not in self._params:
# If authentication has failed, and we haven't already tried
# username/password, and configuration allows it, then try
# again with username/password.
if 'username' not in self._params:
self._params['username'] = getpass.getuser()
self._params['password'] = getpass.getpass()
self._connect()
else:
raise paramiko.AuthenticationException(e)
if self._ssh.get_transport():
self._sftp = self._ssh.open_sftp()
def connect_with_key(self):
"""Try connecting with key string."""
LOG.debug("Trying to connect with private key string")
if not self.private_key:
raise paramiko.AuthenticationException("No key supplied")
pkey = make_pkey(self.private_key)
return self._connect(pkey=pkey, look_for_keys=False, allow_agent=False)
def _connect_transport(self, pkey):
for _ in xrange(self.CONNECT_TIMEOUT_RETRIES):
transport = paramiko.Transport(self._connect_socket())
completed = threading.Event()
transport.start_client(completed)
completed.wait(self.CONNECT_TIMEOUT_SECONDS)
if completed.isSet():
self._check_transport_error(transport)
completed.clear()
transport.auth_publickey(self.user, pkey, completed)
completed.wait(self.CONNECT_TIMEOUT_SECONDS)
if completed.isSet():
self._check_transport_error(transport)
if not transport.is_authenticated():
transport.close()
raise paramiko.AuthenticationException()
return transport
logging.warn("SSH negotiation (%s:%d) timed out, retrying",
self.hostname, self.port)
# HACK: we can't count on transport.join not hanging now, either
transport.join = lambda: None
transport.close()
logging.error(
"SSH negotiation (%s:%d) has timed out %s times, "
"giving up", self.hostname, self.port,
self.CONNECT_TIMEOUT_RETRIES)
raise error.AutoservSSHTimeout("SSH negotiation timed out")
def _connect_to_gateway(self):
"""
Open connection to SSH gateway
- First try with all keys loaded from an SSH agent (if allowed)
- Then with those passed directly or read from ~/.ssh/config
- As last resort, try with a provided password
"""
for key in self.ssh_private_keys:
self.logger.debug('Trying to log in with key: {0}'.format(
hexlify(key.get_fingerprint())))
try:
self._transport.connect(hostkey=self.ssh_host_key,
username=self.ssh_username,
pkey=key)
return
except paramiko.AuthenticationException:
self.logger.error('Could not open connection to gateway')
self._stop_transport()
if self.ssh_password: # avoid conflict using both pass and pkey
self.logger.debug('Logging in with password {0}'.format(
'*' * len(self.ssh_password)))
self._transport.connect(hostkey=self.ssh_host_key,
username=self.ssh_username,
password=self.ssh_password)
else:
raise paramiko.AuthenticationException(
'No authentication methods available')
def __build_ssh_client(self):
self.ssh_client = paramiko.SSHClient()
# paramiko.util.log_to_file(self.__ssh_logfile, 10)
self.ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
us, pw = self.__get_ssh_credentials()
if not us:
self.logger.error('Credentials could not be retrieved. Reason: username was None')
raise paramiko.AuthenticationException('Credentials could not be retrieved.')
try:
time.sleep(2 * random.randrange(8))
self.ssh_client.connect(self.ssh_server, port=self.ssh_server_port, username=us, password=pw)
except paramiko.AuthenticationException as ex:
self.logger.error('Could not authenticate to remote server "%s:%d". Reason: %s' % (self.ssh_server, self.ssh_server_port, ex))
return
except paramiko.BadHostKeyException as ex:
self.logger.error('Host key was invalid. Reason: %s' % ex)
return
except paramiko.SSHException as ex:
self.logger.error('There was a problem with the SSH connection. Reason: %s' % ex)
return
except Exception as ex:
self.logger.error('Could not allocate socket for SSH. Reason: %s' % ex)
return
def run(self):
"""
Override multiprocessing.Process's run() method with our own that
executes a command over ssh.
"""
try:
self.ssh = paramiko.SSHClient()
assert (self.ssh)
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.ssh.connect(hostname=self.host,
username=self.user,
password=self.pwd,
timeout=self.ssh_timeout_in_seconds,
banner_timeout=_banner_timeout_in_seconds)
if self.cmd:
logger.debug("Trying to send the command %s to the server %s" %
(self.cmd, self.host))
self._send_command()
except KeyboardInterrupt as e:
logger.exception(e.message)
pass
except (paramiko.SSHException, paramiko.AuthenticationException) as e:
if self.errQueue:
if isinstance(e, paramiko.BadAuthenticationType):
e = paramiko.AuthenticationException(e.__str__())
self.errQueue.put(e)
except Exception, e:
if self.errQueue:
self.errQueue.put(Exception("%r" % e))
def get_client(self):
"""Get SSH Client."""
if self.ssh_client is not None:
return self.ssh_client
keys = []
if self._key_file_path:
keys.append(
paramiko.RSAKey.from_private_key_file(self._key_file_path))
else:
agent = paramiko.Agent()
keys = agent.get_keys()
if not keys:
raise paramiko.AuthenticationException(
"ERROR: No SSH Agent keys found!")
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
if self.verbose:
key_file_path = ''
if self._key_file_path:
key_file_path = " -i %s" % (self._key_file_path)
log.verbose(
"ssh%s -p %d %s@%s" %
(key_file_path, self.port, self.username, self.hostname))
saved_exception = paramiko.AuthenticationException(
"ERROR: SSH Authentication Error!")
for key in keys:
if isinstance(key, paramiko.AgentKey):
fp = hexlify(key.get_fingerprint())
log.info("Trying SSH Agent key: {0}".format(fp))
try:
client.connect(hostname=self.hostname,
username=self.username,
port=self.port,
pkey=key,
timeout=self.timeout)
return client
except paramiko.SSHException, e:
saved_exception = e
def connect_with_key_file(self):
"""Try connecting with key file."""
LOG.debug("Trying to connect with key file")
if not self.key_filename:
raise paramiko.AuthenticationException("No key file supplied")
return self._connect(key_filename=os.path.expanduser(
self.key_filename),
look_for_keys=False,
allow_agent=False)
def start_session_using_password(self, user, password):
logger.debug(u"Validating with Password")
transport = None
try:
transport = self.get_transport()
transport.auth_password(user, password)
self._start_session(transport)
except Exception as e:
logger.error(e.message)
self._session.close_session()
if transport:
transport.close()
self._socket.close()
raise paramiko.AuthenticationException(u"Invalid Password")
def connect(self, user=None, port=None,
timeout: timedelta = timedelta(seconds=30)):
user = user or self.user
port = port or self.port
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
self.ssh.connect(self.ip, username=user,
port=port, timeout=timeout.total_seconds())
except paramiko.AuthenticationException as e:
raise paramiko.AuthenticationException(
f"Authentication exception occurred while trying to connect to DUT. "
f"Please check your SSH key-based authentication.\n{e}")
except (paramiko.SSHException, socket.timeout) as e:
raise ConnectionError(f"An exception of type '{type(e)}' occurred while trying to "
f"connect to {self.ip}.\n {e}")
def connect_ssh(username, hostname, port, key):
key_f = StringIO.StringIO(key)
pkey = paramiko.RSAKey.from_private_key(key_f)
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
for _ in range(10):
try:
ssh.connect(hostname, username=username, pkey=pkey)
break
except paramiko.AuthenticationException as e:
raise paramiko.AuthenticationException(e)
except socket.error:
time.sleep(3)
else:
raise RuntimeError('SSH Connection Error')
return ssh
def _connect_transport(self, transport, username=None, password=None):
if not username:
username = self.username
if not password:
password = self.password
try:
transport.start_client()
except paramiko.SSHException:
raise ConnectionError("SSH negotiation failed")
hostkeys = HostKeys()
hostkey_file = os.path.expanduser('~/.ssh/known_hosts')
hostkeys.load(hostkey_file)
server_hostkey_name = ("[%s]:%d" % (self.hostname, self.port)
if self.port != 22 else self.hostname)
server_hostkey_type = transport.host_key.get_name()
try:
# Raises KeyError if no host key is present
expected_key = hostkeys[server_hostkey_name][server_hostkey_type]
if expected_key != transport.host_key:
if self.hostkey_change_cb():
raise KeyError
else:
raise SSHException(
"SSH host key changed to %s" %
binascii.hexlify(transport.host_key.get_fingerprint()))
except KeyError:
hostkeys.add(server_hostkey_name, server_hostkey_type,
transport.host_key)
hostkeys.save(hostkey_file)
try:
transport.auth_password(username, password)
# double check, auth_password should already raise the exception
if not transport.is_authenticated():
raise paramiko.AuthenticationException()
except paramiko.AuthenticationException:
raise LoginFailedException("SSH login failed for user %s" %
username)
def connect(self, client, hostname=None, port=22, log=True):
"""Connect SSH client object using credentials
:type client:
paramiko.client.SSHClient
paramiko.transport.Transport
:type log: bool
:raises paramiko.AuthenticationException
"""
kwargs = {
'username': self.username,
'password': self.__password}
if hostname is not None:
kwargs['hostname'] = hostname
kwargs['port'] = port
keys = [self.__key]
keys.extend([k for k in self.__keys if k != self.__key])
for key in keys:
kwargs['pkey'] = key
try:
client.connect(**kwargs)
if self.__key != key:
self.__key = key
logger.debug(
'Main key has been updated, public key is: \n'
'{}'.format(self.public_key))
return
except paramiko.PasswordRequiredException:
if self.__password is None:
logger.exception('No password has been set!')
raise
else:
logger.critical(
'Unexpected PasswordRequiredException, '
'when password is set!')
raise
except (paramiko.AuthenticationException,
paramiko.BadHostKeyException):
continue
msg = 'Connection using stored authentication info failed!'
if log:
logger.exception(
'Connection using stored authentication info failed!')
raise paramiko.AuthenticationException(msg)
def run(self):
'''
Override multiprocessing.Process's run() method with our own that
executes a command over ssh.
'''
try:
key_file = '/etc/skyscraper/esx.pem'
self.ssh = paramiko.SSHClient()
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
if tvpxglobals.standaloneMode and os.path.exists(key_file):
self.ssh.connect(hostname=self.host,
username=self.user,
password=self.pwd,
timeout=self.sshTimeout,
key_filename=key_file)
else:
self.ssh.connect(hostname=self.host,
username=self.user,
password=self.pwd,
timeout=self.sshTimeout)
if self.cmd:
self._send_command()
except KeyboardInterrupt:
pass
except (paramiko.SSHException, paramiko.AuthenticationException) as e:
if self.errQueue:
# Workaround paramiko bug (BadAuthenticationType is not
# serializable)
if isinstance(e, paramiko.BadAuthenticationType):
e = paramiko.AuthenticationException(e.__str__())
self.errQueue.put(e)
except Exception as e:
if self.errQueue:
# Always convert to string in case exception is not serializable
self.errQueue.put(Exception("%r" % e))
finally:
self.ssh.close()
#Allow the process to join even when items added to queue are not
#consumed.
self.queue.cancel_join_thread()
self.errQueue.cancel_join_thread()
def connect(
self,
client, # type: typing.Union[paramiko.SSHClient, paramiko.Transport]
hostname=None, # type: typing.Optional[str]
port=22, # type: int
log=True, # type: bool
): # type: (...) -> None
"""Connect SSH client object using credentials.
:param client: SSH Client (low level)
:type client: typing.Union[paramiko.SSHClient, paramiko.Transport]
:param hostname: remote hostname
:type hostname: str
:param port: remote ssh port
:type port: int
:param log: Log on generic connection failure
:type log: bool
:raises paramiko.AuthenticationException: Authentication failed.
"""
kwargs = {
'username': self.username,
'password': self.__password,
} # type: typing.Dict[str, typing.Any]
if hostname is not None:
kwargs['hostname'] = hostname
kwargs['port'] = port
if isinstance(client, paramiko.client.SSHClient): # pragma: no cover
# paramiko.transport.Transport still do not allow passphrase and key filename
if self.key_filename is not None:
kwargs['key_filename'] = self.key_filename
if self.__passphrase is not None:
kwargs['passphrase'] = self.__passphrase
keys = [self.__key]
keys.extend([k for k in self.__keys if k != self.__key])
for key in keys:
kwargs['pkey'] = key
try:
client.connect(**kwargs)
if self.__key != key:
self.__key = key
logger.debug('Main key has been updated, public key is: \n'
'{}'.format(self.public_key))
return
except paramiko.PasswordRequiredException:
if self.__password is None:
logger.exception('No password has been set!')
raise
else:
logger.critical(
'Unexpected PasswordRequiredException, when password is set!'
)
raise
except (paramiko.AuthenticationException,
paramiko.BadHostKeyException):
continue
msg = 'Connection using stored authentication info failed!'
if log:
logger.exception(msg)
raise paramiko.AuthenticationException(msg)
def connect(
self,
client: paramiko.SSHClient,
hostname: str,
port: int = 22,
log: bool = True,
*,
sock: paramiko.ProxyCommand | paramiko.Channel | socket.socket
| None = None,
) -> None:
"""Connect SSH client object using credentials.
:param client: SSH Client (low level)
:type client: paramiko.SSHClient
:param hostname: remote hostname
:type hostname: str
:param port: remote ssh port
:type port: int
:param log: Log on generic connection failure
:type log: bool
:param sock: socket for connection. Useful for ssh proxies support
:type sock: typing.Optional[typing.Union[paramiko.ProxyCommand, paramiko.Channel, socket.socket]]
:raises PasswordRequiredException: No password has been set, but required.
:raises AuthenticationException: Authentication failed.
"""
kwargs: dict[str, typing.Any] = {}
if self.__passphrase is not None:
kwargs["passphrase"] = self.__passphrase
if sock is not None:
kwargs["sock"] = sock
for index, key in sorted(enumerate(self.__keys),
key=lambda i_k: i_k[0] != self.__key_index):
kwargs["pkey"] = key
try:
# noinspection PyTypeChecker
client.connect(
hostname=hostname,
port=port,
username=self.username,
password=self.__password,
key_filename=self.
__key_filename, # type: ignore[arg-type] # types verified by not signature
**kwargs,
)
if index != self.__key_index:
self.__key_index = index
LOGGER.debug(
f"Main key has been updated, public key is: \n{self.public_key}"
)
return
except paramiko.PasswordRequiredException:
if self.__password is None:
LOGGER.exception("No password has been set!")
raise
LOGGER.critical(
"Unexpected PasswordRequiredException, when password is set!"
)
raise
except (paramiko.AuthenticationException,
paramiko.BadHostKeyException):
continue
msg: str = "Connection using stored authentication info failed!"
if log:
LOGGER.exception(msg)
raise paramiko.AuthenticationException(msg)
